CN118137005A - Degumming method, battery pack, power utilization device and energy storage device - Google Patents

Abstract

The present application discloses a degumming method, a battery pack, an electrical device and an energy storage device, and belongs to the field of battery technology. The degumming method includes: expanding a pipe located in the adhesive layer to cause cracks in the adhesive layer, and the adhesive layer is bonded between the battery cell and the box body; injecting a solvent into the expanded pipe to dissolve the adhesive layer. In the embodiment of the present application, the pipe located in the adhesive layer is first expanded, and the adhesive layer is subjected to the stress applied by the pipe, resulting in a large strain, cracks, and the adhesive layer is initially debonded. Injecting a solvent into the pipe to dissolve the adhesive layer can further debond the bonding interface, so that the battery cell can be easily detached from the adhesive layer. The embodiment of the present application can effectively alleviate the situation where the battery cell may be damaged during the degumming process.

Description

Degumming method, battery pack, power-consuming device and energy storage device

Technical Field

The present application relates to the field of battery technology, and in particular to a degumming method, a battery pack, an electrical device and an energy storage device.

Background technique

New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in energy storage and other fields. Batteries include a box and battery cells. The battery cells are bonded to the inside of the box with structural adhesive. When replacing the battery cells, the battery cells need to be peeled off from the adhesive layer.

In the related art, the efficiency of the degumming process is low.

Summary of the invention

In order to solve the above technical problems, the present application provides a degumming method, a battery pack, an electrical device and an energy storage device to alleviate the situation where the battery cells may be damaged during the degumming process.

This application is implemented through the following technical solutions.

A first aspect of an embodiment of the present application provides a degumming method, comprising:

Expanding a pipe in a glue layer to cause cracks in the glue layer, the glue layer being bonded between the battery cell and the box body;

A dissolving agent is injected into the expanded pipe to dissolve the glue layer.

In the embodiment of the present application, the pipe located in the adhesive layer is first expanded, and the adhesive layer is subjected to the stress applied by the pipe, resulting in a large strain, cracks, and initial debonding of the adhesive layer. Injecting a solvent into the pipe to dissolve the adhesive layer can further debond the bonding interface, so that the battery cell can be easily detached from the adhesive layer. The embodiment of the present application does not require frozen storage of the battery cell, which can effectively improve the efficiency of the debonding process. Furthermore, the embodiment of the present application does not need to apply a large stress to the battery cell to separate the battery cell from the adhesive layer, so as to alleviate the situation where the battery cell is damaged during the debonding process.

In one embodiment, expanding a pipe in a glue layer to cause cracks in the glue layer includes:

An expansion material is injected into the pipe to expand the pipe.

In the embodiment of the present application, an expansion material is injected into the pipeline to expand the pipeline. The expansion material can expand through the external environment to exert an expansion force on the pipeline, thereby causing cracks in the adhesive layer. The expansion method is simple and can save manpower.

In one embodiment, injecting expansion material into a pipeline to expand the pipeline includes:

injecting expansion material into the pipe;

The pipe is heated to expand the intumescent material.

In the embodiment of the present application, an expansion material is injected into the pipeline. The expansion material can expand rapidly in a heated environment, thereby causing a larger strain in the adhesive layer and a better debonding effect.

In one embodiment, the volume expansion rate of the expansion material is greater than 10%.

In the solution of the embodiment of the present application, the larger volume expansion rate of the expansion material can cause the adhesive layer to produce a larger strain, and the debonding effect is correspondingly better.

In one embodiment, the volume expansion rate of the expansion material is greater than 15%.

In the solution of the embodiment of the present application, the larger volume expansion rate of the expansion material can cause the adhesive layer to further produce a larger strain, and the debonding effect is correspondingly better.

In one embodiment, expanding a pipe in a glue layer to cause cracks in the glue layer includes:

Placing an adjusting member in the pipeline, wherein the maximum outer diameter of the adjusting member is greater than the inner diameter of the pipeline;

The adjusting member is driven to move in the pipeline to expand the pipeline.

In the embodiment of the present application, the adjusting member is placed in the pipeline, and the maximum outer diameter of the adjusting member can exert stress on the pipe wall of the pipeline, thereby expanding the pipeline. The adjusting member can be used repeatedly to expand the pipeline, and the debonding cost of the battery cell is low.

In one embodiment, driving the adjusting member to move in the pipeline includes:

The air pressure on two opposite sides of the adjusting member is adjusted to form an air pressure difference on the two opposite sides of the adjusting member, and the air pressure difference is configured to push the adjusting member to move in the pipeline.

In the embodiment of the present application, the adjusting member is moved in the pipeline by adjusting the air pressure on the two opposite sides of the adjusting member. Compared with manual driving, the method of using the air pressure difference to drive the adjusting member to move is simpler.

In one embodiment, the adjusting member is in the shape of a cone having a small face and a large face opposite to each other, the diameter of the large face is larger than the diameter of the small face, and the small face is located downstream of the large face along the moving direction of the adjusting member.

In the embodiment of the present application, the shape of the adjusting member is a cone, and the small face of the cone is located downstream of the large face along the moving direction of the adjusting member. The adjusting member can be positioned with the pipe wall of the pipeline through the small face, and the adjusting member can be placed in the pipeline relatively quickly. The small face being located downstream in the moving direction can reduce the resistance encountered by the adjusting member inside the pipeline, so that the adjusting member can move relatively smoothly in the pipeline.

In one embodiment, the absolute value of the difference between the solubility of the solvent and the solubility of the pipe is less than 2 .

In the embodiment of the present application, the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline is less than 2 The solvent can dissolve the pipe more smoothly, thereby increasing the contact area between the solvent and the adhesive layer, increasing the dissolution rate of the adhesive layer, and increasing the efficiency of debonding the battery cell and the adhesive layer.

In one embodiment, the absolute value of the difference between the solubility of the solvent and the solubility of the pipe is less than 1.5 .

In the embodiment of the present application, the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline is less than 1.5 The solvent can further dissolve the pipe more smoothly, thereby increasing the contact area between the solvent and the adhesive layer, increasing the dissolution rate of the adhesive layer, and increasing the efficiency of debonding the battery cell and the adhesive layer.

In one embodiment, the material of the pipe is polypropylene, polyamide, polyethylene terephthalate or polycarbonate; the material of the solvent is phenol, xylene, tetrahydrofuran or m-cresol.

In the embodiment of the present application, the material of the pipe can produce a large strain to squeeze the adhesive layer, thereby causing cracks in the adhesive layer. Furthermore, the pipe can be dissolved by the solvent well, thereby increasing the degumming efficiency.

A second aspect of the present application provides a battery pack, comprising:

Box;

An adhesive layer connected to the box body;

A battery cell is disposed on the adhesive layer, and the adhesive layer is bonded between the box body and the battery cell;

The pipeline is at least partially arranged in the adhesive layer, the pipeline can be expanded under the action of external force, and the material of the pipeline can be dissolved by the solvent.

In the embodiment of the present application, the pipe is arranged in the adhesive layer, and the pipe can expand under the action of external force, and the expanded pipe can exert stress on the adhesive layer, thereby reducing the bonding strength between the battery cell and the adhesive layer. Furthermore, the pipe can be dissolved by the solvent, and after the pipe is dissolved, the solvent can better contact the adhesive layer, thereby further debonding the adhesive layer and the battery cell, and the debonding efficiency is relatively high.

In one embodiment, the pipeline includes a plurality of straight pipes and at least one connecting pipe, and the connecting pipe connects two adjacent straight pipes.

In the embodiment of the present application, the pipeline includes a straight pipe and a connecting pipe, and the connecting pipe connects two adjacent straight pipes. The straight pipe and the connecting pipe are connected to each other, so that during the process of expanding the pipeline, an expansion material is injected into one end of the pipeline or an adjustment piece is placed, and the expansion material and the adjustment piece can be moved to the other end of the pipeline, and the expansion efficiency is high.

In one embodiment, the length direction of the straight tube is arranged along the thickness direction of the battery cell.

In the embodiment of the present application, the length direction of the straight pipe is arranged along the thickness direction of the battery cell. The battery cell usually has an explosion-proof valve, and the arrangement of the pipeline needs to avoid the explosion-proof valve. The shell wall where the explosion-proof valve is located is smaller in the thickness direction of the battery cell than in the width direction. The straight pipe of the pipeline is evenly arranged in the width direction while avoiding the explosion-proof valve, so that the battery cell is evenly stressed when the pipeline is expanded.

In one embodiment, the adhesive layer is made of structural adhesive.

In the embodiment of the present application, the material of the adhesive layer is structural adhesive. The structural adhesive has the characteristic of low strain. After a certain strain occurs, the structural adhesive will undergo brittle deformation, thereby reducing the bonding strength. Furthermore, the structural adhesive can be dissolved by an organic solvent, so that the adhesive layer can be separated from the battery cell more smoothly.

In one embodiment, the housing includes a main housing and a thermal management component, the battery cell is located in the main housing, and the adhesive layer is respectively bonded to the thermal management component and the battery cell.

In the embodiment of the present application, the box body includes a main box body and a thermal management component. The thermal management component reduces the temperature of the battery cell during operation, and the performance of the battery cell during operation is more stable.

In one embodiment, the battery pack further includes an expansion material located in the pipe, or the battery pack further includes an adjustment member located in the pipe, and a maximum outer diameter of the adjustment member is greater than an inner diameter of the pipe.

In the embodiment of the present application, the expansion material and the adjustment member are located in the pipeline, and the expansion material and the adjustment member can expand the pipeline under certain conditions to cause the glue layer to initially debond.

In one embodiment, along the arrangement direction of the battery cells and the adhesive layer, opposite sides of the adhesive layer have a first surface and a second surface, and the channel is located between the first surface and the second surface.

In the embodiment of the present application, the adhesive layer has a first surface and a second surface that are opposite to each other, and the pipeline is located between the first surface and the second surface. After the pipeline is expanded, the strain generated by the pipeline can act more on the adhesive layer, so that the adhesive layer has more connections and the debonding effect is better. Furthermore, there is no pipeline blocking between the battery cell and the adhesive layer, the contact area between the battery cell and the adhesive layer is larger, the connection strength is higher, and the battery cell is more stable in the box.

A third aspect of an embodiment of the present application provides an electrical device, including:

Device body;

The battery pack described in any of the above items is used to supply power to the device body.

A fourth aspect of an embodiment of the present application provides an energy storage device, comprising:

Install the container;

The battery pack described in any of the above items is arranged in the installation container.

Effect of the invention:

The embodiment of the present application first expands the pipe located in the adhesive layer. The adhesive layer is subjected to the stress applied by the pipe, resulting in a large strain, cracks, and initial debonding of the adhesive layer. Injecting a solvent into the pipe to dissolve the adhesive layer can further debond the bonding interface, allowing the battery cell to be easily detached from the adhesive layer. The embodiment of the present application does not require frozen storage of the battery cells, and can effectively improve the efficiency of the debonding process. Furthermore, the embodiment of the present application does not require applying a large stress to the battery cell to separate the battery cell from the adhesive layer, so as to alleviate the situation where the battery cell is damaged during the debonding process.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

FIG1 is a schematic flow chart of a degumming method according to a first embodiment of the present application;

FIG2 is a schematic flow diagram of a degumming method according to a second embodiment of the present application;

FIG3 is a schematic diagram of a degumming method according to a third embodiment of the present application;

FIG4 is a schematic flow chart of a degumming method according to a fourth embodiment of the present application;

FIG5 is a schematic diagram of a degumming method according to a fifth embodiment of the present application;

FIG6 is a schematic structural diagram of a battery pack according to the first embodiment of the present application, in which the glue layer is not shown;

FIG7 is a cross-sectional view along position A in FIG6 ;

FIG8 is a schematic diagram of the structure of a pipeline according to an embodiment of the present application, in which the adjusting member is located inside the pipeline;

FIG. 9 is a schematic structural diagram of a battery pack according to a second embodiment of the present application.

Description of Reference Numerals

1. Box body; 2. Glue layer; 2a. First surface; 2b. Second surface; 3. Battery cell; 4. Pipe; 40. Straight pipe; 41. Connecting pipe; 5. Adjustment part; 5a. Large surface; 5b. Small surface.

Detailed ways

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "top", "bottom", "upper", and "lower" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated, or used in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

In the related art, the battery cells are bonded to the box body by structural adhesive. In order to separate the battery cells from the structural adhesive, the energy storage device needs to be placed in a low temperature environment for a period of time to increase the brittleness of the structural adhesive before peeling. This process takes a long time and the efficiency of debonding the battery cells is low.

The present application achieves preliminary debonding by expanding the pipe 4 located in the glue layer 2 to cause cracks in the glue layer 2, and injecting a solvent into the pipe 4 to enable the battery cell 3 to be easily separated from the glue layer 2, thereby increasing the debonding efficiency.

The solution of the embodiment of the present application can be applied to, but is not limited to, a battery pack including a battery cell 3 or a battery unit, and can also be applied to an electrical device including a battery cell 3 and a battery pack.

The present application provides an electrical device, which includes a device body and a battery pack, and the battery pack is used to supply power to the device body.

An electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. For example, the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

The device body refers to the main structure that consumes electric energy to realize the corresponding function. For example, the power-consuming device can be a mobile phone, and the device body is the part that can realize functions such as communication, and the battery cell 3 or battery pack supplies power to the part that can realize functions such as communication. For example, the power-consuming device can be a car, and the device body is the part that can be used for people to sit and travel on the road, and the battery cell 3 or battery pack supplies power to the part that can be used for people to sit and travel on the road.

A battery pack refers to a device that can output electric energy. For example, electric energy can be output by a battery pack composed of battery cells 3. For example, electric energy can be output by a battery module composed of battery cells 3 and a battery pack composed of battery modules.

The electrical device of an embodiment of the present application is taken as an example of a vehicle.

The vehicle provided in one embodiment of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle, for example, the battery pack may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

In some embodiments of the present application, the battery pack can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

The present application also provides a battery pack, which includes a mounting shell and a battery cell, wherein the battery cell is disposed inside the mounting shell.

The present application also provides a battery unit, which includes at least two battery cells 3 and one or at least two bars. The bars are electrically connected to two different battery cells 3, respectively. Exemplarily, the number of battery cells 3 can be multiple, and the multiple battery cells 3 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 3 are both connected in series and in parallel. The multiple battery cells 3 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 3 is placed in the box 1. Of course, the multiple battery cells 3 can be first connected in series, in parallel, or in mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and the whole formed by the multiple battery modules connected in series, in parallel, or in mixed connection is placed in the box 1. The battery pack may also include other structures. For example, the battery pack may also include a busbar component for realizing electrical connection between the multiple battery cells 3.

The present application also provides an energy storage device, which includes an installation container and a battery pack, wherein the battery pack is disposed in the installation container.

The present application also provides a battery pack, please refer to Figures 6 to 9, the battery pack includes a box body 1, a glue layer 2, a battery cell 3 and a pipe 4. The glue layer 2 is connected to the box body 1. The battery cell 3 is arranged in the glue layer 2, and the glue layer 2 is bonded between the box body 1 and the battery cell 3. The pipe 4 is at least partially arranged in the glue layer 2, the pipe 4 can expand under the action of an external force, and the material of the pipe 4 can be dissolved by a solvent.

The battery cell 3 refers to a basic unit that can realize mutual conversion between chemical energy and electrical energy.

In the embodiment of the present application, the battery cell 3 may be a secondary battery. A secondary battery refers to a battery cell 3 that can be continuously used by activating active materials by charging after the battery cell 3 is discharged.

In the embodiment of the present application, the battery cell 3 can be a lithium ion battery, a sodium 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, etc., which is not limited in the embodiment of the present application.

Exemplarily, the present application does not limit the type of bare cell, and the bare cell may be a square wound cell or a laminated cell.

The housing 1 is a component serving as the outer frame of the battery pack.

The adhesive layer 2 refers to a portion used to bond the battery cell 3 to the box body 1 , and the adhesive layer 2 is used to fix the battery cell 3 .

The pipe 4 is a component for limiting the flow direction of the expansion material.

The solvent refers to a solution that can dissolve the pipe 4 and the adhesive layer 2 .

The fact that the pipeline 4 can expand under the action of external force means that the inner diameter and the outer diameter of the pipeline 4 can increase under the action of external force.

Exemplarily, the adhesive layer 2 forms a channel, and the pipeline 4 is located in the channel.

In the embodiment of the present application, the pipe 4 is disposed in the adhesive layer 2, and the pipe 4 can expand under the action of external force, and the expanded pipe 4 can exert stress on the adhesive layer 2, thereby reducing the bonding strength between the battery cell 3 and the adhesive layer 2. Furthermore, the pipe 4 can be dissolved by the dissolving agent, and after the pipe 4 is dissolved, the dissolving agent can better contact the adhesive layer 2, thereby further debonding the adhesive layer 2 and the battery cell 3, and the debonding efficiency is relatively high.

In one embodiment, referring to FIG. 6 , the pipeline 4 includes a plurality of straight pipes 40 and at least one connecting pipe 41 , and the connecting pipe 41 connects two adjacent straight pipes 40 .

It is understandable that the present application does not limit the shape of the connecting pipe 41 , and the connecting pipe 41 may be a straight-line pipeline or an arc-shaped pipeline.

In the embodiment of the present application, the pipeline 4 includes a straight pipe 40 and a connecting pipe 41, and the connecting pipe 41 connects two adjacent straight pipes 40. The straight pipe 40 and the connecting pipe 41 are connected to each other, so that during the expansion process of the pipeline 4, an expansion material is injected into one end of the pipeline 4 or an adjustment member 5 is placed, and the expansion material and the adjustment member 5 can be moved to the other end of the pipeline 4, and the expansion efficiency is high.

Expandable materials refer to materials that can expand in volume under certain conditions.

Exemplarily, the expansion material may be a fluid, a gas, or a solid.

It is understandable that the embodiments of the present application are not limited to the pipeline 4 including multiple straight pipes 40 and at least one connecting pipe 41. Exemplarily, the pipeline 4 includes multiple straight pipes 40 that are not connected to each other, and the multiple straight pipes 40 are at least partially arranged in the glue layer 2.

In one embodiment, referring to FIG. 6 , the length direction of the straight tube 40 is arranged along the thickness direction of the battery cell 3 .

Exemplarily, the battery cell 3 includes an explosion-proof valve, which is located on a side of the battery cell 3 facing the colloid.

Exemplarily, the dimension of the battery cell 3 in the thickness direction is smaller than the dimension of the battery cell 3 in the width direction.

Exemplarily, the thickness direction of the battery cell 3 is shown as direction R1 in FIG. 6 .

Exemplarily, the width direction of the battery cell 3 is shown as direction R2 in FIG. 6 .

In the embodiment of the present application, the length direction of the straight pipe 40 is arranged along the thickness direction of the battery cell 3. The battery cell 3 usually has an explosion-proof valve, and the arrangement of the pipeline 4 needs to avoid the explosion-proof valve. The shell wall where the explosion-proof valve is located is smaller in the thickness direction of the battery cell 3 than in the width direction. The straight pipe 40 of the pipeline 4 is evenly arranged in the width direction while avoiding the explosion-proof valve, so that the battery cell 3 is evenly stressed when the pipeline 4 expands.

In one embodiment, the material of the adhesive layer 2 is structural adhesive.

Exemplarily, the material of the adhesive layer 2 is structural adhesive, specifically polyurethane.

In the embodiment of the present application, the material of the adhesive layer 2 is structural adhesive. The structural adhesive has the characteristic of low strain. After a certain strain occurs, the structural adhesive will undergo brittle deformation, thereby reducing the bonding strength. Furthermore, the structural adhesive can be dissolved by an organic solvent, so that the adhesive layer 2 can be separated from the battery cell 3 more smoothly.

In one embodiment, the box body 1 includes a main box body 1 and a thermal management component, the battery cell 3 is located in the main box body 1, and the adhesive layer 2 is bonded to the thermal management component and the battery cell 3 respectively.

The heat management component refers to a device that enables fluid to flow inside to perform heat exchange with the battery cells 3 .

Exemplarily, the thermal management component is a water cooling plate.

Exemplarily, the thermal management component is fixedly connected to the main box body 1 .

In the embodiment of the present application, the box body 1 includes a main box body 1 and a thermal management component. The thermal management component reduces the temperature of the battery cell 3 during operation, and the performance of the battery cell 3 during operation is more stable.

In one embodiment, the battery pack further includes an expansion material located in the pipe 4, or the battery pack further includes an adjustment member 5 located in the pipe, and the maximum outer diameter of the adjustment member 5 is greater than the inner diameter of the pipe.

In the embodiment of the present application, the expansion material and the adjustment member 5 are located in the pipe 4 . The expansion material and the adjustment member 5 can expand the pipe 4 under certain conditions to cause the adhesive layer 2 to initially debond.

In one embodiment, the material of the pipe 4 is polypropylene, polyamide, polyethylene terephthalate or polycarbonate; the material of the solvent is phenol, xylene, tetrahydrofuran or m-cresol.

In the embodiment of the present application, the material of the pipe 4 can produce a large strain to squeeze the adhesive layer 2, thereby causing cracks in the adhesive layer 2. Furthermore, the pipe 4 can be well dissolved by the solvent, thereby increasing the debonding efficiency.

In one embodiment, the absolute value of the difference between the solubility of the solvent and the solubility of the pipe 4 is less than 2 .

It will be appreciated that the solubility parameter of a dissolving agent can be obtained through experimentation and calculation.

Exemplarily, the molar enthalpy of vaporization is obtained according to the Claplan-Clausius equation ,in Where p is the vapor pressure;

T is temperature;

is the volume of the substance before vaporization;

is the volume of the substance after vaporization.

In one embodiment, the unit of the vapor pressure p may be Pa.

In one embodiment, the unit of temperature T may be °C, and the volume of the substance before vaporization may be The unit can be cm ³ /mol, the volume of the substance after vaporization The unit can be cm ³ /mol, molar enthalpy of vaporization The unit may be J/mol.

According to the first law of thermodynamics, the cohesive energy of the solvent is obtained:

In one embodiment, the cohesive energy The unit may be J/mol.

According to the cohesive energy of the solvent and molar volume , find the solubility parameter of the solvent :

In one embodiment, the solubility parameter of the solvent is The unit can be .

It is understandable that the solubility parameter of the pipe 4 can be indirectly measured by a viscosity method.

Exemplarily, the pipe 4 is dissolved in a series of solvents with different solubility parameters, the intrinsic viscosity of each solution is measured, the solubility parameters of the solvents are plotted, and the solubility parameter corresponding to the maximum intrinsic viscosity is taken as the solubility parameter of the pipe 4.

In the embodiment of the present application, the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline 4 is less than 2 The dissolving agent can dissolve the pipe 4 relatively smoothly, thereby increasing the contact area between the dissolving agent and the adhesive layer 2 , increasing the dissolution rate of the adhesive layer 2 , and increasing the efficiency of debonding the battery cell 3 and the adhesive layer 2 .

In one embodiment, the absolute value of the difference between the solubility of the solvent and the solubility of the pipe 4 is less than 1.5 .

In the embodiment of the present application, the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline 4 is less than 1.5 The dissolving agent can further dissolve the pipe 4 more smoothly, thereby increasing the contact area between the dissolving agent and the adhesive layer 2 , increasing the dissolution rate of the adhesive layer 2 , and increasing the efficiency of debonding the battery cell 3 and the adhesive layer 2 .

In one embodiment, referring to FIG. 7 , along the arrangement direction of the battery cells 3 and the adhesive layer 2 , the adhesive layer 2 has a first surface 2a and a second surface 2b on opposite sides, and the channel 4 is located between the first surface 2a and the second surface 2b.

Exemplarily, the first surface 2 a is attached to the box body 1 , and the second surface 2 b is attached to the battery cell 3 .

In the embodiment of the present application, the adhesive layer 2 has a first surface 2a and a second surface 2b opposite to each other, and the pipe 4 is located between the first surface 2a and the second surface 2b. After the pipe 4 is expanded, the strain generated by the pipe 4 can act more on the adhesive layer 2, so that the adhesive layer 2 has more connections, and the debonding effect is better. Furthermore, there is no pipe 4 blocking between the battery cell 3 and the adhesive layer 2, the contact area between the battery cell 3 and the adhesive layer 2 is larger, the connection strength is higher, and the battery cell 3 is more stable in the box 1.

It is understandable that the embodiments of the present application are not limited to the pipe 4 being located between the first surface 2a and the second surface 2b along the arrangement direction of the battery cells 3 and the adhesive layer 2. Exemplarily, along the arrangement direction of the battery cells 3 and the adhesive layer 2, the pipe 4 is partially located on the side of the adhesive layer 2 facing the battery cells 3.

The present application also provides a degumming method. Please refer to FIG. 1 . The degumming method includes:

Step S1: expanding the pipe in the glue layer to cause cracks in the glue layer, and the glue layer is bonded between the battery cell and the box body;

Step S2: injecting a dissolving agent into the expanded pipe to dissolve the glue layer.

In the scheme of the embodiment of the present application, the pipe 4 located in the adhesive layer 2 is first expanded, and the adhesive layer 2 is subjected to the stress applied by the pipe 4, resulting in a large strain, cracks, and the adhesive layer 2 is initially debonded. Injecting a solvent into the pipe 4 to dissolve the adhesive layer 2 can further debond the bonding interface, so that the battery cell 3 can be easily detached from the adhesive layer 2. The embodiment of the present application does not require the battery cell 3 to be frozen for storage, and can effectively improve the efficiency of the debonding process. Furthermore, the embodiment of the present application does not need to apply a large stress to the battery cell 3 to separate the battery cell 3 from the adhesive layer 2, so as to alleviate the situation where the battery cell 3 is damaged during the debonding process.

In one embodiment, referring to FIG. 2 , expanding the pipe 4 in the adhesive layer 2 to cause cracks in the adhesive layer 2 includes:

Step S10: injecting expansion material into the pipeline to expand the pipeline.

Expandable materials refer to materials that can expand in volume under certain conditions.

Exemplarily, the expansion material may be a fluid, a gas, or a solid.

In the embodiment of the present application, an expansion material is injected into the pipe 4 to expand the pipe 4. The expansion material can expand through the external environment to apply an expansion force to the pipe 4, thereby causing cracks in the adhesive layer 2. The expansion method is simple and can save manpower.

In one embodiment, referring to FIG. 2 , after injecting the expansion material into the pipe 4 to expand the pipe 4 , the debonding method further includes:

Step S11: closing two opposite ends of the pipeline.

In the embodiment of the present application, after the expansion material is injected into the pipe 4 and the two opposite ends are sealed, the volume expansion of the expansion material can be accelerated, and the pipe 4 can be expanded more quickly, thereby increasing the degumming efficiency.

In one embodiment, referring to FIG. 3 , injecting expansion material into the pipeline 4 to expand the pipeline 4 includes:

Step S100: injecting expansion material into the pipeline;

Step S101: heating the pipeline to expand the expansion material.

Illustratively, the expansion material is a polyvinyl chloride fluid.

In the embodiment of the present application, an expansion material is injected into the pipe 4. The expansion material can expand rapidly in a heated environment, thereby causing a larger strain to be generated in the adhesive layer 2 and a better debonding effect.

It is to be understood that the embodiments of the present application are not limited to injecting polyvinyl chloride fluid into the pipeline 4. In one embodiment, injecting expansion material into the pipeline 4 to expand the pipeline 4 includes:

Step S102: injecting polyurethane fluid into the pipeline.

In one embodiment, the volume expansion rate of the expansion material is greater than 10%.

Exemplarily, the volume expansion rate of the expansion material is 11%, 15%, 20%, 25%, 30%, 35% or 40%.

It is understood that the volume expansion rate of the expansion material can be indirectly measured by the water displacement method.

In the solution of the embodiment of the present application, the larger volume expansion rate of the expansion material can cause the adhesive layer 2 to produce a larger strain, and the debonding effect is correspondingly better.

In one embodiment, the volume expansion rate of the expansion material is greater than 15%.

In the solution of the embodiment of the present application, the larger volume expansion rate of the expansion material can cause the adhesive layer 2 to further produce a larger strain, and the debonding effect is correspondingly better.

In one embodiment, referring to FIG. 4 , expanding the pipe 4 in the adhesive layer 2 to cause cracks in the adhesive layer 2 includes:

Step S12: placing an adjusting member in the pipeline, wherein the maximum outer diameter of the adjusting member is greater than the inner diameter of the pipeline;

Step S13: driving the adjusting member to move in the pipeline to expand the pipeline.

The adjusting member 5 refers to an object having a certain hardness and capable of expanding the pipeline 4 through the maximum outer diameter, and the volume of the adjusting body itself does not expand.

In the embodiment of the present application, the adjusting member 5 is placed in the pipe 4, and the maximum outer diameter of the adjusting member 5 can exert stress on the pipe wall of the pipe 4, thereby expanding the pipe 4. The adjusting member 5 can be used repeatedly to expand the pipe 4, and the debonding cost of the battery cell 3 is low.

In one embodiment, referring to FIG. 5 , driving the adjusting member 5 to move in the pipe 4 includes:

Step S130: adjusting the air pressure on two opposite sides of the adjusting member to form an air pressure difference on the two opposite sides of the adjusting member, and the air pressure difference is configured to push the adjusting member to move in the pipeline.

In the embodiment of the present application, the air pressure on the two opposite sides of the adjusting member 5 is adjusted to enable the adjusting member 5 to move in the pipe 4. Compared with manual driving, the method of using the air pressure difference to drive the adjusting member 5 to move is simpler.

In one embodiment, adjusting the air pressure on two opposite sides of the adjusting member 5 so as to form an air pressure difference on two opposite sides of the adjusting member 5 includes:

Step S1300: along the moving direction of the adjusting member, negative pressure is applied to the end of the pipeline located at the front end of the adjusting member, and positive pressure is applied to the end of the pipeline located at the rear end of the adjusting member.

In one embodiment, please refer to Figure 8, the shape of the adjusting member 5 is a cone, the cone has a small face 5b and a large face 5a opposite to each other, the diameter of the large face 5a is larger than the diameter of the small face 5b, and the small face 5b is located downstream of the large face 5a along the moving direction of the adjusting member 5.

In the embodiment of the present application, the adjusting member 5 is in the shape of a cone, and the small face 5b of the cone is located downstream of the large face 5a along the moving direction of the adjusting member 5. The adjusting member 5 can be positioned with the pipe wall of the pipe 4 through the small face 5b, and the adjusting member 5 can be placed in the pipe 4 relatively quickly. The small face 5b being located downstream in the moving direction can reduce the resistance of the adjusting member 5 inside the pipe 4, so that the adjusting member 5 can move relatively smoothly in the pipe 4.

It is understandable that the embodiment of the present application is not limited to the shape of the adjusting member 5 being a cone. Exemplarily, the shape of the adjusting member 5 is a cube or a cylinder.

In one embodiment, the battery pack includes a box body 1, an adhesive layer 2, a battery cell 3 and a pipe 4. The pipe is arranged at the bottom of the box body, and the pipe expands under the action of external force, so that the bonding interface between the adhesive layer and the battery cell is initially debonded. A solvent is injected into the pipe to dissolve the pipe and the adhesive layer for further debonding. The pipe 4 includes a plurality of straight pipes 40 and at least one connecting pipe 41, and the connecting pipe 41 connects two adjacent straight pipes 40. The length direction of the straight pipe 40 is arranged along the thickness direction of the battery cell 3. The material of the adhesive layer 2 is polyurethane structural adhesive. The battery pack also includes an expansion material located in the pipe 4, or the battery pack also includes an adjustment member 5 located in the pipe, and the maximum outer diameter of the adjustment member 5 is greater than the inner diameter of the pipe. The material of the pipe 4 is polypropylene, polyamide, polyethylene terephthalate or polycarbonate; the material of the solvent is phenol, xylene, tetrahydrofuran or meta-cresol. The absolute value of the difference between the solubility of the solvent and the pipe 4 is less than 2 Along the arrangement direction of the battery cells 3 and the adhesive layer 2, the adhesive layer 2 has a first surface 2a and a second surface 2b on opposite sides, and the pipeline 4 is located between the first surface 2a and the second surface 2b.

The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope.

Claims (20)

1. A degumming method, characterized in that it comprises: Expanding a pipe in a glue layer to cause cracks in the glue layer, the glue layer being bonded between the battery cell and the box body; A dissolving agent is injected into the expanded pipe to dissolve the glue layer. 2. The degumming method according to claim 1, characterized in that expanding the pipe located in the glue layer to cause cracks in the glue layer comprises: An expansion material is injected into the pipe to expand the pipe. 3. The degumming method according to claim 2, characterized in that injecting expansion material into the pipeline to expand the pipeline comprises: injecting expansion material into the pipe; The pipe is heated to expand the intumescent material. 4. The degumming method according to claim 2, characterized in that the volume expansion rate of the expansion material is greater than 10%. 5. The degumming method according to claim 4, characterized in that the volume expansion rate of the expansion material is greater than 15%. 6. The degumming method according to claim 1, characterized in that expanding the pipe in the glue layer to cause cracks in the glue layer comprises: Placing an adjusting member in the pipeline, wherein the maximum outer diameter of the adjusting member is greater than the inner diameter of the pipeline; The adjusting member is driven to move in the pipeline to expand the pipeline. 7. The degumming method according to claim 6, characterized in that driving the adjusting member to move in the pipeline comprises: The air pressure on two opposite sides of the adjusting member is adjusted to form an air pressure difference on the two opposite sides of the adjusting member, and the air pressure difference is configured to push the adjusting member to move in the pipeline. 8. The degumming method according to claim 6 is characterized in that the adjusting member is in the shape of a cone, the cone having a small face and a large face opposite to each other, the diameter of the large face is larger than the diameter of the small face, and the small face is located downstream of the large face along the moving direction of the adjusting member. 9. The degumming method according to any one of claims 1 to 8, characterized in that the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline is less than 2 . 10. The degumming method according to any one of claims 1 to 8, characterized in that the absolute value of the difference between the solubility of the solvent and the solubility of the pipeline is less than 1.5 . 11. The degumming method according to any one of claims 1 to 8, characterized in that the material of the pipe is polypropylene, polyamide, polyethylene terephthalate or polycarbonate; the material of the solvent is phenol, xylene, tetrahydrofuran or m-cresol. 12. A battery pack, comprising: Box; An adhesive layer connected to the box body; A battery cell is disposed on the adhesive layer, and the adhesive layer is bonded between the box body and the battery cell; The pipeline is at least partially arranged in the adhesive layer, the pipeline can be expanded under the action of external force, and the material of the pipeline can be dissolved by the solvent. 13 . The battery pack according to claim 12 , wherein the pipeline comprises a plurality of straight pipes and at least one connecting pipe, and the connecting pipe connects two adjacent straight pipes. 14 . The battery pack according to claim 13 , wherein the length direction of the straight tube is arranged along the thickness direction of the battery cell. 15 . The battery pack according to claim 12 , wherein the adhesive layer is made of structural adhesive. 16 . The battery pack according to claim 12 , wherein the box body comprises a main box body and a thermal management component, the battery cell is located in the main box body, and the adhesive layer is respectively bonded to the thermal management component and the battery cell. 17. The battery pack according to claim 12, characterized in that the battery pack further comprises an expansion material located in the pipe, or the battery pack further comprises an adjustment member located in the pipe, and a maximum outer diameter of the adjustment member is greater than an inner diameter of the pipe. 18 . The battery pack according to claim 12 , wherein along the arrangement direction of the battery cells and the adhesive layer, opposite sides of the adhesive layer have a first surface and a second surface, and the channel is located between the first surface and the second surface. 19. An electrical device, comprising: Device body; The battery pack according to claim 12 is used to supply power to the device body. 20. An energy storage device, comprising: Install the container; The battery pack according to claim 12 is disposed in the mounting container.