CN120565936A

CN120565936A - Housing, housing of battery, power utilization device, and method of processing housing

Info

Publication number: CN120565936A
Application number: CN202410217408.8A
Authority: CN
Inventors: 曹梦凯; 黄守君; 苏华圣; 陈新祥; 蔡祥虎; 郑于炼; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-02-27
Filing date: 2024-02-27
Publication date: 2025-08-29
Also published as: WO2025179706A1; WO2025179706A9

Abstract

The present application relates to the field of battery technology and provides a housing, a battery shell, a battery, an electrical device, and a method for processing the housing. The housing has a housing cavity and a mounting opening connected to the housing cavity. The housing cavity is used to accommodate bare cells. The housing wall includes a side wall and an end wall. The first end of the side wall encloses the mounting opening. The end wall is disposed at the second end of the side wall and, together with the side wall, encloses a semi-enclosed housing cavity. The side wall has a first zone and a second zone, and the hardness of the first zone is lower than that of the second zone. The housing, battery shell, battery, electrical device, and method for processing the housing provided by the present application can reduce the probability of the housing cracking.

Description

Housing, housing of battery, power utilization device, and method of processing housing

Technical Field

The application relates to the technical field of batteries, in particular to a shell, a shell of a battery, the battery, an electric device and a method for processing the shell.

Background

New energy batteries are increasingly used in life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like.

In the related art, a bare cell is arranged in a shell of a battery, and the bare cell can expand in the process of charging and discharging the battery, so that the shell is easy to deform and crack.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a housing, a battery case, a battery, an electric device, and a method for processing a housing, which can reduce the probability of cracking the housing.

In order to achieve the above object, the technical solution of the embodiment of the present application is as follows:

The embodiment of the application discloses a shell, which is provided with a containing cavity and a mounting port communicated with the containing cavity, wherein the containing cavity is used for containing a bare cell, a shell wall of the shell comprises a side wall and an end wall, the first end of the side wall is surrounded to form the mounting port, the end wall is arranged at the second end of the side wall and is surrounded with the side wall together to form a semi-closed containing cavity, the side wall is provided with a first area and a second area, and the hardness of the first area is lower than that of the second area.

In the above technical scheme, through set up in the casing hold the chamber and hold the chamber intercommunication the installation mouth, like this, naked electric core can be put into from the installation mouth and hold the chamber to protect naked electric core to a certain extent, improve naked electric core's life. Through forming first district and second district at the shell wall of casing, the hardness in first district sets up to be less than the hardness in second district, like this, after naked electric core takes place to expand, the effort of naked electric core to predetermineeing the shell wall can be absorbed and dispersed to the lower first district of hardness to can reduce the risk that the casing takes place the fracture, the security is high.

In one embodiment, the shell wall with the largest area on the side wall is a preset shell wall, and the first area is at least formed on the preset shell wall.

In the above technical scheme, after the bare cell expands, since the preset shell wall is the shell wall with the largest shell area, the preset shell wall is the largest force application object after the bare cell expands, and the acting force of the bare cell to the shell can be better absorbed and dispersed by setting the first area at least on the preset shell wall with the largest area, so that the risk of cracking the shell is reduced.

In one embodiment, the ratio of the hardness of the first region to the hardness of the second region is between 0.3 and 0.8, or the ratio of the hardness of the first region to the hardness of the second region is between 0.5 and 0.8.

In the technical scheme, by setting the proper hardness ratio, on one hand, enough structural strength can be provided for the shell to protect the bare cell and prolong the service life of the bare cell, and on the other hand, the acting force of the bare cell on the shell can be reduced in the first area with lower hardness after the bare cell expands, the risk of cracking of the shell is reduced, and the safety is high.

In one embodiment, the hardness of the first region and the hardness of the second region are both Brinell hardness.

In one embodiment, the housing is aluminum, the second region has a hardness of between 35HB and 65HB, and the first region has a hardness of between 25HB and 40 HB.

In the technical scheme, through setting up the second district of suitable hardness and setting up the first district of suitable hardness, not only can provide sufficient structural strength for the casing, can also reduce the risk that the casing takes place the fracture.

In one embodiment, the second region has a grain type of bar and/or ribbon and the first region has a grain type of columnar and/or equiaxed.

In the above technical solution, by setting the grain type of the second region to be stripe-shaped and/or ribbon-shaped, and setting the grain type of the first region to be columnar and/or equiaxed, it is shown that the hardness of the first region is lower than that of the second region, because the formation of columnar and equiaxed crystals during crystallization of the metal is hindered, resulting in blurring of boundaries between grains, relatively disordered lattice structure, and relatively easy formation of ribbon-shaped and stripe-shaped crystals, with relatively ordered lattice structure. The crystal structure affects the mechanical properties of the metal, e.g., disordered crystal structure results in reduced hardness and strength, while an ordered lattice structure results in increased hardness and strength, but reduced toughness. That is, when the case is subjected to a force applied thereto by the expansion of the bare cell, the disordered crystal structure can better absorb and disperse the force due to its higher toughness, so as to reduce the occurrence of crack propagation and fracture.

In one embodiment, the first region is arranged along the circumferential extension of the mounting opening.

In the technical scheme, the first area can be increased along the circumferential extension arrangement of the mounting opening, when the bare cell expands, the first area circumferentially arranged around the mounting opening can better absorb and disperse the acting force of the bare cell to the shell, the cracking condition of the mounting opening is reduced, and the working stability is good.

In one embodiment, the distance between the first area on the preset shell wall and the circumferential direction of the mounting opening is not less than 50mm, and/or the distance between the first area on the preset shell wall and the circumferential direction of the mounting opening is a first distance, the distance between the preset shell wall and the circumferential direction of the mounting opening is a second distance, and the ratio of the first distance to the second distance is not less than 25%.

In the above technical scheme, through setting up suitable circumference distance, can prolong the circumference length of first district to can absorb and disperse the effort of naked electric core inflation to the casing along circumference better, further reduce the risk of cracking. Through setting up suitable ratio, when guaranteeing to predetermine the shell wall and have sufficient structural strength, can also improve the whole toughness of predetermining the shell wall to absorb and disperse the effort that naked electric core inflation applyed it, reduce the condition that appears splitting.

In an embodiment, a direction perpendicular to the preset wall is a target direction, and the area of the projection area of the first area is smaller than the area of the projection area of the second area.

In the technical scheme, the area of the first area is smaller than that of the second area, so that the shell has high toughness while the shell has enough structural strength, the acting force applied to the shell by the expansion of the bare cell is absorbed and dispersed, the stress concentration is reduced, and the cracking risk is reduced.

The embodiment of the application also discloses a shell of the battery, which comprises a top cover and the shell in any one of the embodiments, wherein the top cover is arranged at the mounting opening.

In the above technical scheme, through setting up the first district on the default shell wall of casing, the hardness in the second district is little to the hardness in first district, like this, the effort that the naked electric core inflation was applyed the casing can be absorbed and dispersed in first district, reduces the stress concentration of installing port, reduces the fracture risk of installing port department, and the security is high.

In one embodiment, the top cover is connected with the shell through welding, the hardness of a molten pool area formed by welding the shell is not less than that of the first area, the opening direction of the mounting opening is the first direction, and the size of the first area along the first direction is not less than 0.2mm.

In the technical scheme, the top cover and the shell are welded, and the hardness of the molten pool area is larger than that of the second area, so that the connection strength between the top cover and the shell is improved. Through setting up the first district of suitable size, under the condition that satisfies the casing and have sufficient structural strength, can also make the casing have stronger toughness to absorb and disperse the effort that naked electric core inflation was applyed the casing, reduce the stress concentration of installing port department, reduce the fracture condition of installing port department, improve the cyclic expansion life-span of casing under charge and discharge.

In one embodiment, the first region has a dimension in the first direction of not less than 1mm.

In the technical scheme, the first area with the proper size is arranged, so that the cracking condition at the mounting opening is reduced conveniently.

In one embodiment, the first region has a dimension in the first direction that is no greater than half the dimension of the housing in the first direction.

In the technical scheme, the shell is ensured to have enough structural strength so as to protect the internal bare cell, the toughness of the shell can be improved, the acting force applied to the shell by the expansion of the bare cell can be absorbed and dispersed, the cracking condition is reduced, and the cyclic expansion life of the shell under the charge and discharge conditions is prolonged.

In one embodiment, the opening direction of the mounting opening is a first direction, and the molten pool area is located at one side of the first area facing the corresponding mounting opening along the corresponding first direction.

In the technical scheme, the molten pool area is arranged between the mounting opening and the first area along the first direction, so that the top cover and the shell are convenient to weld stably, the connection strength is improved, and the first area is close to the molten pool area, so that the stress concentration of the molten pool area can be reduced, and the cracking condition at the molten pool area is reduced.

In one embodiment, the first zone is located between the molten bath zone and the second zone in a first direction, the first zone extending continuously from the molten bath zone to the second zone.

In the technical scheme, the first area is respectively in contact connection with the second area and the molten pool area, and the first area can be further heated and softened through the residual temperature of the molten pool area, so that the hardness of the first area is lower, and the toughness is better.

In an embodiment, the first zone comprises a first sub-zone and a second sub-zone, the first sub-zone being adjacent to the molten bath zone, the first sub-zone and the second sub-zone being spaced apart along the first direction.

In the technical scheme, the acting force applied by the expansion of the bare cell can be absorbed and dispersed through the first subarea, and the cracking prevention effect is better. The first sub-area and the second sub-area are arranged at intervals along the first direction, which means that the second sub-area can be arranged according to the position requirement to meet the requirement under the complex stress environment.

In an embodiment, the first sub-zone and the second sub-zone are spaced apart in the first direction by a distance between 0.05mm and 10mm.

In the above technical scheme, the second subarea is conveniently set according to the requirement by setting the distance of proper interval.

In yet another aspect, an embodiment of the present application discloses a battery, including a bare cell and a housing in any of the foregoing embodiments, where the bare cell is disposed in a receiving cavity.

In the technical scheme, the risk of cracking of the shell caused by the expansion of the bare cell can be reduced, and the service life of the battery is prolonged.

In one embodiment, the first region is spaced from the bare cell by a distance of between 0.3mm and 7mm along the opening direction of the mounting opening.

In the technical scheme, by setting the proper interval, the toughness of the shell is improved, the damage to the bare cell can be reduced, and the service life of the bare cell is prolonged.

In one embodiment, the first region and the bare cell are spaced apart from each other by 1mm to 3mm along the opening direction of the mounting opening.

In the technical scheme, the damage to the bare cell can be reduced by setting a proper interval.

In one embodiment, the battery comprises a lower plastic, wherein the lower plastic is arranged on the side surface of the top cover facing the bare cell, and the distance between the lower plastic and the first area along the inner and outer directions is larger than 1mm.

In the above technical scheme, through setting up down the plastic in the side of top cap towards naked electric core, can play the effect of insulating and separating top cap and naked electric core, avoid top cap and naked electric core direct contact to avoid the risk of short circuit and battery damage. Through setting up suitable interval, can reduce and lead to the fact the damage to lower plastic, improve the life of plastic down, job stabilization nature is good.

In one embodiment, the lower plastic is spaced from the first region in the medial-lateral direction by a distance of between 1.2mm and 5 mm.

In the technical scheme, the damage to the lower plastic can be reduced by setting a proper interval.

In another aspect, the embodiment of the application discloses an electric device, which comprises the battery in any one of the above embodiments and is used for providing electric energy.

In the above technical solution, the safety of the battery is improved, and the safety of the corresponding electric device is also improved.

In another aspect, the embodiment of the application discloses a method for processing a shell, which comprises the following steps:

softening, namely heating and softening at least a preset shell wall of the shell to soften at least part of a second area of the preset shell wall into a first area;

the installation opening of the shell is communicated with the accommodating cavity of the shell, the preset shell wall is arranged adjacent to the installation opening, and the preset shell wall is the shell wall with the largest area of the shell.

In the technical scheme, the preset shell wall of the shell is heated and softened, so that at least the second area of the preset shell wall is softened into the first area, the hardness of the first area is lower than that of the second area, after the bare cell expands, the first area with lower hardness can absorb and disperse the acting force of the bare cell on the preset shell wall, so that the risk of cracking of the shell can be reduced, the leakage probability of electrolyte in the shell is reduced, and the cyclic expansion life of the shell under charge and discharge is prolonged. The first area is formed by softening the second area, so that the addition of new materials can be reduced, and the shell is good in integration.

In one embodiment, the method further comprises:

placing the bare cell into a softened shell;

The top cover is connected with the shell containing the bare cell at the mounting opening, so that the top cover plugs the bare cell in the containing cavity.

In the technical scheme, the mode of firstly softening the shell and then connecting the shell and the top cover is adopted, so that the damage to the bare cell can be reduced when the softening operation is implemented.

In one embodiment, before performing the softening step, the method further comprises:

In the above technical scheme, before the softening step is executed, the top cover can be covered on the mounting port, and then the shell and the top cover can be connected in a welding mode, so that the top cover is plugged and mounted, and the bare cell is plugged in the accommodating cavity. In this way, the position selection can be made according to the softening requirements.

In one embodiment, at least heating and softening the predetermined shell wall of the housing to soften at least a portion of the second region of the predetermined shell wall into a first region comprises:

At least a target area of a preset shell wall of the shell is heated and softened to soften at least part of a second area of the preset shell wall into a first area, the target area is positioned between the bare cell and the mounting opening along the opening direction of the mounting opening, and the target area and the bare cell are arranged at intervals along the opening direction of the mounting opening.

In the technical scheme, the target area between the bare cell and the mounting port is heated and softened into the first area, the hardness of the first area is lower than that of the second area, when the bare cell expands, the first area can absorb and disperse acting force applied by the bare cell to the bare cell, so that stress concentration at the mounting port is reduced, the risk of cracking at the mounting port is reduced, and the cyclic expansion life of the shell under charge and discharge is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is a schematic cross-sectional view of the housing of FIG. 1;

FIG. 5 is an enlarged schematic view at C in FIG. 4;

FIG. 6 is a golden phase diagram of the second region;

FIG. 7 is a golden phase diagram of the first region;

FIG. 8 is a Vickers hardness spectrum of a portion of a shell;

FIG. 9 is a Brinell hardness spectrum of a portion of a shell;

Fig. 10 is a flowchart of a method for processing a housing according to another embodiment of the application.

Description of the reference numerals

Battery 100, bare cell 1, case 2, case 21, housing cavity 21a, mounting port 21b, first region 21c, first sub-region 21c1, second sub-region 21c2, second region 21d, molten pool region 21e, first case wall 211, second case wall 212, third case wall 213, top cover 22, pressure relief port 22a, liquid filling port 22b, electrode port 22c, lower plastic 3, first distance H1, second distance H2.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "include" and "have" and any variations thereof in the description of the application and the above description of the drawings are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, and interconnected between two elements or an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

As part of the inventive concept, before describing the embodiments of the present application, the cause of the easy cracking of the battery case in the related art needs to be analyzed, and the technical solution of the embodiments of the present application is obtained through reasonable analysis.

In the related art, the bare cell is located in the accommodating cavity of the shell, in the charging and discharging process of the battery, taking the charging of the lithium ion battery as an example, lithium ions can be separated from the positive electrode and are embedded into the negative electrode in the charging process of the lithium ion battery, thus the interval between the negative electrode layers can be increased, the expansion of the bare cell is caused, and the expanded bare cell can squeeze the shell to deform and crack.

If set up first district on the shell wall of casing, the hardness in first district is less than the hardness in second district, and after naked electric core took place to expand, the effort of naked electric core to predetermineeing the shell wall can be absorbed and dispersed to the lower first district of hardness to can reduce the risk that the casing takes place to fracture, then reduce the probability that the emergence of electrolyte in the casing leaked, the security is high.

The scheme of the embodiment of the application can be applied to a hard pack battery monomer, a battery module comprising a plurality of hard pack battery monomers or a battery pack comprising hard pack battery monomers or battery modules, and can also be applied to a soft pack battery monomer, a battery module comprising a plurality of soft pack battery monomers or a battery pack comprising soft pack battery monomers or battery modules.

The battery cell refers to a basic unit capable of achieving the mutual conversion of chemical energy and electric energy.

In the embodiment of the application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material in a charging manner to continue to use after the battery cell discharges.

In the embodiment of the present application, the battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited in the embodiment of the present application.

Bare cell refers to an electrochemical cell in a battery, i.e., a cell. The bare cell includes a positive electrode and a negative electrode, and is capable of storing and discharging electric energy.

The bare cell may be wound or stacked by a pole piece.

In one aspect, referring to fig. 1 to 9, a housing 21 is formed with a receiving cavity 21a and a mounting opening 21b communicating with the receiving cavity 21a, the receiving cavity 21a is used for receiving a bare cell 1, a housing wall of the housing 21 includes a side wall and an end wall, a first end of the side wall is surrounded to form the mounting opening 21b, the end wall is disposed at a second end of the side wall and is surrounded to form a semi-closed receiving cavity 21a together with the side wall, a first area 21c and a second area 21d are formed on the side wall, and hardness of the first area 21c is lower than that of the second area 21 d.

The shell 21 is a structure with a certain wall thickness, and the shell 21 is mainly used for accommodating the bare cell 1, so that a certain protection is formed for the bare cell 1, and the risk of damage caused by the bare cell 1 exposed outside is reduced.

The housing 21 may be, for example, rectangular or cylindrical in shape. When the shape of the case 21 is a rectangular parallelepiped, the corresponding battery 100 is a square battery, and when the shape of the case 21 is a cylindrical body, the corresponding battery 100 is a cylindrical battery.

The accommodation chamber 21a refers to an accommodation space within the case 21 for accommodating the bare cell 1.

The mounting port 21b communicates with the accommodation chamber 21a, and the bare cell 1 can be placed into the accommodation chamber 21a of the case 21 through the mounting port 21 b.

The first region 21c and the second region 21d refer to the wall of the housing 21, and may be the inner wall of the housing 21 or the outer wall of the housing 21, except that the hardness of the first region 21c is smaller than that of the second region 21 d.

The semi-closed receiving chamber 21a means that the second end of the receiving chamber 21a is provided with an end wall for blocking, while the first end has a mounting opening 21b.

According to the housing 21 provided by the embodiment of the application, the accommodating cavity 21a and the mounting port 21b communicated with the accommodating cavity 21a are arranged in the housing 21, so that the bare cell 1 can be placed into the accommodating cavity 21a from the mounting port 21b, the bare cell 1 is protected to a certain extent, and the service life of the bare cell 1 is prolonged. By forming the first region 21c and the second region 21d on the wall of the case 21, the hardness of the first region 21c is set to be lower than that of the second region 21d, so that after the bare cell 1 expands, the first region 21c with lower hardness can absorb and disperse the acting force of the bare cell 1 on the preset wall, thereby reducing the risk of cracking of the case 21 and having high safety.

In one embodiment, the wall with the largest area on the side wall is a preset wall, and the first region 21c is at least formed on the preset wall.

Thus, after the bare cell 1 expands, since the preset shell wall is the shell wall with the largest area of the shell 21, the preset shell wall is the largest force application object of the bare cell 1 after expanding, and the acting force of the bare cell 1 on the shell 21 can be better absorbed and dispersed by setting the first area 21c at least on the preset shell wall with the largest area, so as to reduce the cracking risk of the shell 21.

In an exemplary embodiment, referring to fig. 1, the housing 21 has five housing walls, two of the five housing walls are first housing walls 211, two of the two first housing walls 211 have equal areas, two of the five housing walls are second housing walls 212, two of the two second housing walls 212 have equal areas, the last of the five housing walls is a third housing wall 213, the area of the second housing walls 212 and the area of the third housing wall 213 are smaller than the area of the first housing walls 211, the two first housing walls 211 are spaced apart along the second direction, the two second housing walls 212 are spaced apart along the third direction, the third housing wall 213 is connected to the two first housing walls 211 and the two second housing walls 212 along the first direction to jointly define the receiving cavity 21a and the mounting opening 21b, the two first housing walls 211 and the two second housing walls 212 form side walls, the third housing wall 213 is an end wall, and the first housing wall 211 may be a preset housing wall, wherein the first direction, the second direction and the third direction are perpendicular to each other.

It should be noted that, in fig. 1, R1 may be a first direction, R2 may be a second direction, and R3 may be a third direction.

In one embodiment, referring to fig. 8 and 9, the ratio of the hardness of the first region 21c to the hardness of the second region 21d is between 0.3 and 0.8.

Illustratively, the ratio of the hardness of the first zone 21c to the hardness of the second zone 21d may be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

In this way, by setting a proper hardness ratio, on one hand, enough structural strength can be provided for the shell 21 to protect the bare cell 1 and prolong the service life of the bare cell 1, and on the other hand, the acting force of the bare cell 1 on the shell 21 can be reduced by the first area 21c with lower hardness after the bare cell 1 expands, the risk of cracking of the shell 21 is reduced, and the safety is high.

In one embodiment, the ratio of the hardness of the first region 21c to the hardness of the second region 21d is between 0.5 and 0.8.

Illustratively, the ratio of the hardness of the first zone 21c to the hardness of the second zone 21d may be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

In one embodiment, the hardness of the first region 21c and the hardness of the second region 21d are Brinell hardness.

HB is a unit of Brinell hardness.

In one embodiment, referring to fig. 8 and 9, fig. 8 is a vickers hardness spectrum of a portion of the shell, fig. 9 is a brookfield hardness spectrum of a portion of the shell, the shell 21 is made of aluminum, the second region 21d has a hardness of 35HB to 65HB, and the first region 21c has a hardness of 25HB to 40 HB.

Illustratively, the hardness of the second region 21d may be 35HB, 40HB, 45HB, 50HB, 55HB, 60HB, 65HB, or the like, and the hardness of the first region 21c may be 25HB, 30HB, 35HB, or 40HB, or the like.

Here, by providing the second region 21d of suitable hardness and the first region 21c of suitable hardness, not only can the housing 21 be provided with sufficient structural strength, but also the risk of cracking of the housing 21 can be reduced.

HV is the unit of Vickers hardness.

Illustratively, in one embodiment, the first region 21c may have a hardness of 30HB and the second region 21d may have a hardness of 60HB.

For example, in one embodiment, referring to table 1, the mechanical properties of the 3003 alloy are shown in table O, H, H14, H16, or H18, where the hardness columns in the table are the hardness before processing, and taking H14 as an example, when the shell 21 is not processed, the hardness is 40HB, when the shell 21 is processed, the hardness is greater than 40HB, and when the shell 21 is softened, the hardness is less than 40HB. Further, taking H18 as an example, the hardness of the material is 55HB when the material is not processed into the housing 21, and the hardness of the material is greater than 55HB after the material is processed into the housing 21, and the hardness of the material is less than 55HB after the material is softened into the first region 21 c.

Mechanical Properties of the alloy of Table 1 3003

3003 Is an aluminum-manganese alloy.

The "O" state in the above table refers to data of the annealed state of the corresponding aluminum alloy.

In one embodiment, referring to fig. 6 and 7, fig. 6 is a gold phase diagram of the second region, fig. 7 is a gold phase diagram of the first region, the crystal grain type of the second region 21d is a bar-shaped crystal and/or a ribbon-shaped crystal, and the crystal grain type of the first region 21c is a columnar crystal and/or an equiaxed crystal.

Illustratively, the grain type of the second zone 21d may be a ribbon crystal, or the grain type of the second zone 21d may be both a ribbon crystal and a ribbon crystal. The grain type of the first region 21c may be columnar grains, or the grain type of the first region 21c may be equiaxed grains, or the grain type of the first region 21c may be columnar grains and equiaxed grains.

Ribbon crystal refers to a type of crystal grains in which crystal grains are arranged in a ribbon shape along a certain direction.

By bar-like crystals is meant that the grains grow in a certain direction, forming a bar-like or fibrous grain type.

The columnar crystal is a crystal form and is characterized by being in a form of longitudinally extending and columnar.

Equiaxed crystals mean that the grains have small differences in size in all directions and have a high degree of symmetry. In an equiaxed system, the three crystal axes are equal in length and are at 90 ° to each other.

Thus, by arranging the grain type of the second region 21d as a bar and/or ribbon, the grain type of the first region 21c as a columnar and/or equiaxed, it is shown that the hardness of the first region 21c is lower than that of the second region 21d because the formation of columnar and equiaxed crystals may be hindered during crystallization of the metal, causing the boundaries between grains to become blurred, the lattice structure to be relatively disordered, and the ribbon and bar to be relatively easily formed, with the lattice structure being relatively ordered. The crystal structure affects the mechanical properties of the metal, e.g., disordered crystal structure results in reduced hardness and strength, while an ordered lattice structure results in increased hardness and strength, but reduced toughness. That is, when the case 21 is subjected to a force applied thereto by the expansion of the bare cell 1, the disordered crystal structure can better absorb and disperse the force due to its higher toughness, so as to reduce the occurrence of crack propagation and fracture.

Illustratively, in one embodiment, the lower hardness at point E in FIG. 8 is due to voids in the shell wall of the shell 21, but the grain type at that point is also a ribbon and/or a ribbon.

In one embodiment, the first region 21c is disposed along the circumferential extension of the mounting port 21 b.

For example, the first regions 21c may be arranged on the two first case walls 211 and the two second case walls 212 around the circumference of the mounting port 21 b.

Thus, the area of the first region 21c can be increased, when the bare cell 1 expands, the first region 21c circumferentially arranged around the mounting opening 21b can better absorb and disperse the acting force of the bare cell 1 on the shell 21, the cracking condition at the mounting opening 21b is reduced, and the working stability is good.

In one embodiment, referring to fig. 1, the distance between the first areas 21c on the preset wall along the circumferential direction of the mounting opening 21b is not less than 50mm.

By way of example, the first region 21c on the preset housing wall may have a distance of 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm or 100mm, etc. in the circumferential direction of the mounting port 21 b.

In this way, by setting an appropriate circumferential distance, the circumferential length of the first region 21c can be lengthened to be able to absorb and disperse the force of the expansion of the bare cell 1 to the case 21 better in the circumferential direction, further reducing the risk of occurrence of cracking.

In an embodiment, referring to fig. 1, a distance between the first region 21c of the preset wall along the circumferential direction of the mounting opening 21b is a first distance H1, a distance between the preset wall along the circumferential direction of the mounting opening 21b is a second distance H2, and a ratio of the first distance H1 to the second distance H2 is not less than 25%.

Referring to fig. 1, the first distance H1 refers to a length of the first region 21c on the preset housing wall along the circumferential direction of the mounting opening 21b, for example, the first distance H1 may be a length of the first region 21c along the third direction.

Referring to fig. 1, the second distance H2 refers to a length of the preset wall along the circumferential direction of the mounting opening 21b, for example, the second distance H2 may be a length of the preset wall along the third direction.

Illustratively, the ratio of the first distance H1 to the second distance H2 may be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, or the like.

Therefore, by setting the proper ratio, the whole toughness of the preset shell wall can be improved while the preset shell wall has enough structural strength, so that the acting force applied to the preset shell wall by the expansion of the bare cell 1 can be absorbed and dispersed, and the cracking condition is reduced.

In an embodiment, the distance between the first area 21c of the preset wall along the circumferential direction of the mounting opening 21b is not less than 50mm, the distance between the first area 21c of the preset wall along the circumferential direction of the mounting opening 21b is a first distance H1, the distance between the preset wall along the circumferential direction of the mounting opening 21b is a second distance H2, and the ratio of the first distance H1 to the second distance H2 is not less than 25%.

That is, the distance between the first area 21c of the preset housing wall along the circumferential direction of the mounting opening 21b is not less than 50mm, and the distance between the preset housing wall along the circumferential direction of the mounting opening 21b is not less than 200mm, so that the ratio of the first distance H1 to the second distance H2 is not less than 25%, and the preset housing wall has sufficient structural strength to protect the internal bare cell 1 and has stronger toughness to absorb and disperse the acting force of the expansion of the bare cell 1 on the housing 21, thereby reducing the risk of cracking.

In one embodiment, the direction perpendicular to the preset wall is the target direction, and the area of the projection area of the first area 21c is smaller than the area of the projection area of the second area 21 d.

For example, the target direction may be the second direction, and the area of the projection area of the first region 21c along the second direction is smaller than the area of the projection area of the second region 21 d.

Thus, by setting the area of the first region 21c smaller than that of the second region 21d, the housing 21 can be provided with high toughness to absorb and disperse the acting force exerted by the expansion of the bare cell 1, reduce stress concentration, and reduce cracking risk while satisfying that the housing 21 has sufficient structural strength.

Another aspect of the present embodiment provides a housing 2 of a battery 100, referring to fig. 1 to 6, where the housing 2 includes a top cover 22 and a housing 21 according to any one of the above embodiments, and the top cover 22 is covered on a mounting opening 21b.

Here, in the process of charging and discharging, the bare cell 1 will expand cyclically, so that the stress at the mounting port 21b where the top cover 22 is connected with the housing 21 is more concentrated, and cracking is easy to occur, therefore, the first region 21c is arranged on the preset housing wall of the housing 21, and the hardness of the first region 21c is smaller than that of the second region 21d, so that the first region 21c can absorb and disperse the acting force exerted on the housing 21 by the expansion of the bare cell 1, the stress concentration at the mounting port 21b is reduced, the cracking risk at the mounting port 21b is reduced, and the safety is high.

For example, in one embodiment, referring to fig. 1, a pressure relief opening 22a, a liquid injection opening 22b and an electrode port 22c are formed in the top cover 22, the pressure relief opening 22a, the liquid injection opening 22b and the electrode port 22c penetrate through the top cover 22 along the first direction, and the top cover 22 covers the mounting opening 21b, and the pressure relief opening 22a, the liquid injection opening 22b and the electrode port 22c are all communicated with the accommodating cavity 21 a. The pressure release opening 22a is used for releasing pressure of the accommodating cavity 21a after the bare cell 1 is in thermal runaway, so that explosion is avoided. The liquid inlet 22b is used for injecting the electrolyte into the accommodating chamber 21 a. The electrode port 22c facilitates electrical connection to the tab of the bare cell 1.

In an embodiment, referring to fig. 1 and 3, the top cover 22 is welded to the housing 21, the hardness of a molten pool area 21e formed by welding the housing 21 is not less than that of the first area 21c, the opening direction of the mounting opening 21b is the first direction, and the dimension of the first area 21c along the first direction is not less than 0.2mm.

The molten pool area 21e is a portion of the base material melted into a pool shape by heat of the welding arc, and a portion of the liquid metal having a predetermined geometry is formed on the weldment at the time of welding.

Illustratively, the top cover 22 is welded to the housing 21 at the mounting opening 21b, and the housing 21 is welded to form a molten pool area 21e having a hardness not less than that of the first area 21 c. The dimension of the first region 21c in the first direction may be H3, and H3 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, or the like.

Thus, by welding the top cover 22 with the housing 21, the hardness of the molten pool area 21e is greater than that of the second area 21d to improve the connection strength between the top cover 22 and the housing 21. By arranging the first region 21c with a proper size, the housing 21 can have stronger toughness under the condition that the housing 21 has enough structural strength, so as to absorb and disperse the acting force exerted on the housing 21 by the expansion of the bare cell 1, reduce the stress concentration at the mounting opening 21b, reduce the cracking condition at the mounting opening 21b and improve the cycle expansion life of the housing 21 under charge and discharge.

Illustratively, in one embodiment, the first region 21c is formed at least on a predetermined wall of the housing 21, which is the wall of the housing 21 having the largest area. Here, after the bare cell 1 expands, since the preset case wall is the case wall with the largest area of the case 21, the preset case wall will pull the welding position between the case 21 and the top cover 22, resulting in failure of the welding position and thus leakage, and the present application forms the first region 21c at least on the preset case wall, which can reduce the leakage probability to some extent.

In one embodiment, the first region 21c has a dimension in the first direction of not less than 1mm.

By way of example, the dimension H3 of the first region 21c in the first direction may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm or 12mm, etc.

In this way, by providing the first region 21c of a suitable size, it is facilitated to reduce the cracking at the mounting opening 21 b.

In one embodiment, the dimension of the first region 21c in the first direction is not greater than half the dimension of the housing 21 in the first direction

In this way, on one hand, the structural strength of the shell 21 can be improved to protect the internal bare cell 1 and facilitate subsequent grabbing and carrying, and on the other hand, the toughness of the shell 21 can be improved to absorb and disperse the acting force exerted on the shell 21 by the expansion of the bare cell 1, reduce the occurrence of cracking and improve the cycle expansion life of the shell 21 under charge and discharge.

In one embodiment, the opening direction of the mounting opening 21b is a first direction, and the molten pool area 21e is located at a side of the first area 21c facing the corresponding mounting opening 21b along the corresponding first direction.

That is, the molten pool area 21e is disposed between the mounting opening 21b and the first area 21c in the first direction, so that the welding of the top cover 22 and the housing 21 is stabilized, the connection strength is improved, and the first area 21c is close to the molten pool area 21e, so that the stress concentration of the molten pool area 21e can be reduced, and the occurrence of cracking at the molten pool area 21e is reduced.

In one embodiment, referring to fig. 3, 8 and 9, a first zone 21c is located between the molten pool zone 21e and a second zone 21d in a first direction, the first zone 21c continuously extending from the molten pool zone 21e to the second zone 21d.

That is, the first region 21c is in contact with and connected to the second region 21d and the molten pool region 21e, respectively, and the first region 21c can be further softened by heating by the remaining temperature of the molten pool region 21e, so that the first region 21c is lower in hardness and better in toughness.

In one embodiment, referring to FIG. 5, the first zone 21c includes a first sub-zone 21c1 and a second sub-zone 21c2, the first sub-zone 21c1 being adjacent to the molten pool zone 21e, the first sub-zone 21c1 and the second sub-zone 21c2 being spaced apart along the first direction.

Illustratively, the first sub-zone 21c1 may be formed by heat softening of the remaining temperature of the molten pool zone 21e, the second sub-zone 21c2 may be formed by laser softening, and the first sub-zone 21c1 and the second sub-zone 21c2 are spaced apart in the first direction.

In this way, the acting force exerted by the expansion of the bare cell 1 can be absorbed and dispersed not only through the first sub-region 21c1, but also through the second sub-region 21c2, so that the cracking prevention effect is better. The first sub-area 21c1 and the second sub-area 21c2 are arranged at intervals along the first direction, which means that the second sub-area 21c2 can be set according to the position requirement to meet the requirement under the complex stress environment.

Illustratively, in one embodiment, the first region 21c may be formed by thermal annealing the second region 21 d.

For example, in one embodiment, the second region 21d may not be fully annealed so long as the hardness thereof meets the hardness requirement of the first region 21 c.

In one embodiment, referring to fig. 5, the first sub-area 21c1 and the second sub-area 21c2 are spaced apart from each other in the first direction by a distance of between 0.05mm and 10 mm.

Illustratively, the distance separating the first sub-zone 21c1 and the second sub-zone 21c2 along the first direction may be denoted by H4, and H4 may be 0.05mm、0.1mm、0.5mm、1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、5.5mm、6mm、6.5mm、7mm、7.5mm、8mm、8.5mm、9mm、9.5mm or 10mm or the like.

Thus, by setting the distance of the appropriate interval, the second sub-area 21c2 is facilitated to be set as required.

In still another aspect, referring to fig. 1 to 5, a battery 100 is provided, where the battery 100 includes a bare cell 1 and a housing 2 according to any one of the above embodiments, and the bare cell 1 is disposed in a receiving cavity 21 a.

In this way, the risk of cracking of the case 21 due to the expansion of the bare cell 1 can be reduced, and the service life of the battery 100 can be improved.

In one embodiment, referring to fig. 3, the first area 21c and the bare cell 1 are spaced apart from each other by a distance of 0.3mm to 7mm along the opening direction of the mounting opening 21 b.

Illustratively, the opening direction of the mounting opening 21b is the first direction. The spacing of the first region 21c from the bare cell 1 in the first direction may be denoted by H5, and H5 may be 0.3mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or the like.

Thus, by setting a proper interval, the toughness of the housing 21 is improved, the damage to the bare cell 1 is reduced, and the service life of the bare cell 1 is prolonged.

In one embodiment, referring to fig. 3, the first area 21c is spaced from the bare cell 1 by 1mm to 3mm along the opening direction of the mounting opening 21 b.

Illustratively, the spacing H5 of the first region 21c from the bare cell1 in the opening direction of the mounting opening 21b may be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or the like.

Thus, by setting an appropriate pitch, damage to the bare cell 1 can be reduced.

In one embodiment, referring to fig. 3, the battery 100 includes a lower plastic 3, the lower plastic 3 is disposed on the side of the top cover 22 facing the bare cell 1, and the interval between the lower plastic 3 and the first region 21c along the inner and outer directions is greater than 1mm.

Illustratively, the spacing of the lower plastic 3 from the first region 21c in the inward and outward directions may be represented by H6, and H6 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or the like.

Thus, by arranging the lower plastic 3 on the side surface of the top cover 22 facing the bare cell 1, the function of insulating and separating the top cover 22 and the bare cell 1 can be achieved, and the top cover 22 is prevented from being in direct contact with the bare cell 1, so that the risk of short circuit and damage to the battery 100 is avoided. Through setting up suitable interval, can reduce and lead to the fact the damage to lower plastic 3, improve the life of plastic 3 down, job stabilization nature is good.

The inside-outside direction is, for example, perpendicular to the opening direction of the mounting port 21b, and may be, for example, the second direction.

In one embodiment, the spacing between the lower plastic 3 and the first region 21c in the inward-outward direction is between 1.2mm and 5mm.

Illustratively, the spacing H6 of the lower plastic 3 from the first region 21c in the medial-lateral direction may be 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or the like.

Thus, by setting a suitable pitch, damage to the lower plastic 3 can be reduced.

In yet another aspect, an embodiment of the present application provides an electrical device, where the electrical device includes the battery 100 according to any one of the foregoing embodiments, and the battery 100 is configured to provide electrical energy. As the safety of the battery 100 is improved, the safety of the corresponding power consumption device is also improved.

The electric device is a device which takes electric energy as energy source and realizes corresponding functions by consuming the electric energy. Illustratively, the powered device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

The power consumption device according to the embodiment of the present application may include a device main body and a power supply device for supplying power to the device main body, and the power supply device may include a battery 100.

The device body is a body structure which consumes electric energy to realize corresponding functions. For example, the power consumption device may be a mobile phone, the device main body may be a part capable of realizing functions such as communication, and the battery 100 may supply power to the part capable of realizing functions such as communication. For example, the power consumption device may be an automobile, and the device body is a portion on which a person can ride and which can travel on a road, and power is supplied to the portion on which the person can ride and which can travel on the road by the battery 100.

The power supply device refers to a device capable of outputting electric power. For example, the electric power may be output through the battery 100.

The electric device according to an embodiment of the present application will be described by taking a vehicle as an example.

The vehicle provided by the embodiment of the application can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The battery 100 is provided in the interior of the vehicle, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle. The battery 100 may be used for power supply of a vehicle, for example, the battery 100 may be used as an operating power source of the vehicle. The vehicle may also include a controller and a motor, the controller may be used to control the battery 100 package to power the motor. For example, battery 100 unit may be used for operating power requirements during start-up, navigation, and travel of a vehicle.

In still another aspect, the present application provides a method for processing a housing, referring to fig. 10, the method includes:

s1, softening, namely at least heating and softening a preset shell wall of a shell to soften at least part of a second area of the preset shell wall into a first area;

s2, the mounting opening of the shell is communicated with the accommodating cavity of the shell, the preset shell wall is arranged adjacent to the mounting opening, and the preset shell wall is the shell wall with the largest area of the shell.

Illustratively, the second region 21d of the preset wall may be softened by heating with a laser to soften into the first region 21c, the softened first region 21c having a hardness lower than that of the second region 21 d.

In this way, the preset shell wall of the shell 21 is heated and softened to soften at least the second area 21d of the preset shell wall into the first area 21c, the hardness of the first area 21c is lower than that of the second area 21d, and after the bare cell 1 expands, the first area 21c with lower hardness can absorb and disperse the acting force of the bare cell 1 on the preset shell wall, so that the risk of cracking of the shell 21 can be reduced, the occurrence rate of leakage of electrolyte in the shell 21 is reduced, and the cycle expansion life of the shell 21 under charge and discharge is prolonged. The first region 21c is softened by the second region 21d, so that the addition of new material can be reduced, and the housing 21 has good integrity.

Illustratively, in one embodiment, the second region 21d of the inner and/or outer wall of the preset housing wall may be softened by a laser. In this way, the addition of new materials can be reduced, and the housing 21 has good integrity.

In one embodiment, a method includes:

S3, placing the bare cell into the softened shell;

S4, connecting the top cover with the shell containing the bare cell at the mounting opening, so that the top cover plugs the bare cell in the containing cavity.

For example, the preset case wall may be first softened by heating using a laser to soften a portion of the second region 21d into the first region 21c, then the bare cell 1 is placed in the receiving cavity 21a, then the top cover 22 is provided at the mounting opening 21b, and finally the case 21 may be connected to the top cover 22 by welding so that the top cover 22 seals the mounting opening 21b, and the bare cell 1 is blocked in the receiving cavity 21 a.

In this way, by softening the case 21 and then connecting the case 21 and the top cover 22, damage to the bare cell 1 can be reduced when the softening operation is performed.

S5, connecting the top cover with the shell containing the bare cell at the mounting opening, so that the top cover plugs the bare cell in the containing cavity.

For example, before the softening step is performed, the top cover 22 may be first provided to the mounting port 21b, and then the case 21 and the top cover 22 may be connected by welding so that the top cover 22 is mounted in a sealed manner, and the bare cell 1 is sealed in the receiving cavity 21 a. In this way, the position selection can be made according to the softening requirements.

In one embodiment, S1, at least heating and softening a preset shell wall of the shell to soften at least a part of a second area of the preset shell wall into a first area, includes:

S11, at least a target area of a preset shell wall of the shell is heated and softened to soften at least part of a second area of the preset shell wall into a first area, the target area is located between the bare cell and the mounting opening along the opening direction of the mounting opening, and the target area and the bare cell are arranged at intervals along the opening direction of the mounting opening.

For example, at the time of softening, it is possible to select to heat-soften a target area of a preset case wall of the case 21 so as to soften at least a second area 21d of the preset case wall into a first area 21c, while the target area is located between the bare cell 1 and the mounting port 21b in the first direction, the target area being spaced apart from the bare cell 1 in the first direction.

In this way, by heating and softening the target area between the bare cell 1 and the mounting port 21b into the first area 21c, and the hardness of the first area 21c is lower than that of the second area 21d, when the bare cell 1 expands, the first area 21c can absorb and disperse the force applied by the bare cell 1 to the bare cell, so that stress concentration at the mounting port 21b is reduced, and then the risk of cracking at the mounting port 21b is reduced, and the cyclic expansion life of the case 21 under charge and discharge is improved.

It should be noted that, the dimensions, the distances, the pitches, etc. in the above embodiments may be measured by a dimension measuring tool on computer software or directly by a ruler. The hardness may be measured by a metal durometer, for example by dotting and scanning. The grain type can be judged by a gold phase diagram.

The molten pool area 21e refers to a molten pool formed by welding the top cover 22 and the case 21.

Referring to fig. 1 to 9, in the case 21 provided by the embodiment of the present application, the case 21 is formed with a receiving cavity 21a and a mounting port 21b communicating with the receiving cavity 21a, the receiving cavity 21a is used for receiving the bare cell 1, a first area 21c and a second area 21d are formed on a wall of the case 21, the first area 21c is at least formed on a preset wall of the case 21, the preset wall is a wall with the largest area of the case 21, and the preset wall is arranged adjacent to the mounting port 21 b. The ratio of the hardness of the first region 21c to the hardness of the second region 21d is between 0.5 and 0.8, specifically, the material of the case 21 is aluminum, the hardness of the second region 21d is between 35HB and 55HB, the hardness of the first region 21c is between 25HB and 45HB, the crystal grain type of the second region 21d is a bar-shaped crystal and/or a ribbon-shaped crystal, and the crystal grain type of the first region 21c is a columnar crystal and/or an equiaxed crystal. The first region 21c may be disposed to extend in the circumferential direction of the mounting port 21b, and the distance of the first region 21c on the preset wall in the circumferential direction of the mounting port 21b is not less than 50mm, and/or the distance of the first region 21c on the preset wall in the circumferential direction of the mounting port 21b is a first distance H1, the distance of the preset wall in the circumferential direction of the mounting port 21b is a second distance H2, and the ratio of the first distance H1 to the second distance H2 is not less than 25%. The direction perpendicular to the preset housing wall is the target direction, and the projected area of the first region 21c is smaller than the projected area of the second region 21d along the target direction.

The foregoing embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or some or all of the technical features may be equivalently replaced, and the modification or replacement does not deviate the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present application, and is included in the scope of the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A shell is characterized in that an accommodating cavity and an installing port communicated with the accommodating cavity are formed in the shell, the accommodating cavity is used for accommodating a bare cell, a shell wall of the shell comprises a side wall and an end wall, the installing port is formed by surrounding a first end of the side wall, the end wall is arranged at a second end of the side wall and forms a semi-closed accommodating cavity together with the side wall, a first area and a second area are formed in the side wall, and the hardness of the first area is lower than that of the second area.

2. The housing of claim 1, wherein the largest area of the sidewall is a predetermined sidewall, and the first region is formed at least in the predetermined sidewall.

3. The housing of claim 1, wherein the ratio of the hardness of the first zone to the hardness of the second zone is between 0.3 and 0.8, or wherein the ratio of the hardness of the first zone to the hardness of the second zone is between 0.5 and 0.8.

4. A housing according to claim 3, wherein the hardness of the first zone and the hardness of the second zone are both brinell hardness.

5. The housing of claim 1, wherein the housing is aluminum, the second region has a hardness of between 35HB and 65HB, and the first region has a hardness of between 25HB and 40 HB.

6. The housing according to any one of claims 1 to 5, wherein the grain type of the second zone is a bar and/or ribbon and the grain type of the first zone is a columnar and/or equiaxed.

7. The housing of any one of claims 1 to 5, wherein the first region is arranged extending circumferentially of the mounting opening.

8. The housing of claim 2, wherein the distance of the first region of the preset wall along the circumference of the mounting opening is not less than 50mm, and/or the distance of the first region of the preset wall along the circumference of the mounting opening is a first distance, the distance of the preset wall along the circumference of the mounting opening is a second distance, and the ratio of the first distance to the second distance is not less than 25%.

9. The housing according to any one of claim 2, wherein a direction perpendicular to the preset housing wall is a target direction along which the projection is projected, and an area of the projection area of the first region is smaller than an area of the projection area of the second region.

10. A battery case, comprising:

the housing according to any one of claims 1 to 9;

And the top cover is covered on the mounting opening.

11. The housing of claim 10, wherein the top cover is welded to the shell, the hardness of a molten pool area formed by welding the shell is not less than that of the first area, the opening direction of the mounting opening is a first direction, and the dimension of the first area along the first direction is not less than 0.2mm.

12. The housing of claim 11, wherein a dimension of the first region along the first direction is not less than 1mm.

13. The housing of claim 11, wherein a dimension of the first region along the first direction is no greater than half a dimension of the shell along the first direction.

14. The housing of claim 11, wherein the opening direction of the mounting port is a first direction, and the molten pool region is located on a side of the first region facing the corresponding mounting port in the corresponding first direction.

15. The enclosure of claim 14, wherein the first zone is located between the molten bath zone and the second zone along the first direction, the first zone extending continuously from the molten bath zone to the second zone, or wherein the first zone comprises a first sub-zone and a second sub-zone, the first sub-zone being adjacent to the molten bath zone, the first sub-zone and the second sub-zone being spaced apart along the first direction.

16. The housing of claim 15, wherein the first and second sub-regions are spaced apart in the first direction by a distance of between 0.05mm and 10 mm.

17. A battery comprising a bare cell and the housing of any one of claims 10 to 16, the bare cell disposed within the receiving cavity.

18. The battery of claim 17, wherein a spacing of the first region from the bare cell in an opening direction of the mounting opening is between 0.3mm and 7 mm.

19. The battery of claim 18, wherein a spacing of the first region from the bare cell in an opening direction of the mounting opening is 1mm to 3mm.

20. The battery of claim 17, wherein the battery comprises a lower plastic disposed on a side of the top cap facing the bare cell, the lower plastic being spaced from the first region in an inward-outward direction by a distance greater than 1mm.

21. The cell defined in claim 20, wherein the lower plastic is spaced from the first region in an inward-outward direction by a distance of between 1.2mm and 5 mm.

22. An electrical device comprising a battery as claimed in any one of claims 17 to 21 for providing electrical energy.

23. A method of machining a housing, comprising:

24. The method of claim 23, wherein the method further comprises:

placing the bare cell into a softened shell;

and connecting the top cover with the shell containing the bare cell at the mounting opening so that the top cover plugs the bare cell in the containing cavity.

25. The method of claim 23, wherein prior to performing the softening step, the method further comprises:

26. The method of claim 25, wherein at least heating the predetermined shell wall of the housing to soften at least a portion of the second region of the predetermined shell wall into a first region comprises:

At least a target area of a preset shell wall of the shell is heated and softened, so that at least part of a second area of the preset shell wall is softened into a first area, the target area is located between the bare cell and the mounting opening along the opening direction of the mounting opening, and the target area and the bare cell are arranged at intervals along the opening direction of the mounting opening.