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WO2024164261A1 - Ensemble capuchon d'extrémité, appareil de stockage d'énergie et dispositif électrique - Google Patents

Ensemble capuchon d'extrémité, appareil de stockage d'énergie et dispositif électrique Download PDF

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Publication number
WO2024164261A1
WO2024164261A1 PCT/CN2023/075273 CN2023075273W WO2024164261A1 WO 2024164261 A1 WO2024164261 A1 WO 2024164261A1 CN 2023075273 W CN2023075273 W CN 2023075273W WO 2024164261 A1 WO2024164261 A1 WO 2024164261A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
pole
step portion
energy storage
voltage block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/075273
Other languages
English (en)
Chinese (zh)
Inventor
周文扬
熊永锋
王烽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Hithium Energy Storage Technology Co Ltd
Shenzhen Hairun New Energy Technology Co Ltd
Original Assignee
Xiamen Hithium Energy Storage Technology Co Ltd
Shenzhen Hairun New Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen Hithium Energy Storage Technology Co Ltd, Shenzhen Hairun New Energy Technology Co Ltd filed Critical Xiamen Hithium Energy Storage Technology Co Ltd
Priority to PCT/CN2023/075273 priority Critical patent/WO2024164261A1/fr
Publication of WO2024164261A1 publication Critical patent/WO2024164261A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of energy storage technology, and in particular to an end cover assembly, an energy storage device and an electrical equipment.
  • the pole In the end cap assembly of the existing energy storage device, the pole is usually connected to the conductive voltage block by welding.
  • the connection stability between the pole and the conductive voltage block is poor, resulting in poor assembly stability between the pole and the conductive voltage block, which reduces the reliability of the energy storage device.
  • the present application provides an end cover assembly, an energy storage device and an electrical equipment, which can enhance the assembly stability between the pole and the conductive voltage block while keeping the upper surface of the conductive voltage block flat, and increase the contact area between the conductive voltage block and the connecting piece of the energy storage device module, thereby improving the reliability of the assembly between the energy storage device and the energy storage device module.
  • the present application provides an end cap assembly for use in an energy storage device.
  • the end cap assembly includes a conductive voltage block and a pole, the conductive voltage block is provided with a matching hole, the matching hole penetrates the conductive voltage block along the thickness direction of the conductive voltage block, the matching hole includes a step portion and a mounting portion, the mounting portion is located at the bottom side of the step portion and is connected to the step portion, wherein the ratio d1 : d2 of the diameter d1 of the step portion and the diameter d2 of the mounting portion is between 2.4 and 1.05;
  • the pole is passed through the matching hole, the pole includes a riveted portion and a column portion, the riveted portion is mounted on the step portion, the column portion is located at the bottom side of the riveted portion and is mounted on the mounting portion, the outer edge of the riveted portion of the pole is fixed to the step portion of the conductive voltage block by welding, and a welding portion is formed.
  • the conductive voltage block includes a connecting surface, which is used to connect to the connecting piece of the energy storage device module; the top surface of the riveted part is flush with the connecting surface, or the top surface of the riveted part is lower than the connecting surface; or the top surface of the welded part is flush with the connecting surface, or the top surface of the welded part is lower than the connecting surface.
  • the depth d4 of the step portion is between 0.1 mm and 2.8 mm.
  • the line width d3 of the annular surface of the step portion is between 0.15 mm and 4.2 mm.
  • the connecting surface is a rough surface.
  • the roughness of the connecting surface is between Ra 0.8 and Ra 6.3.
  • the connecting surface has a corrugated texture.
  • the density of the corrugated texture in the middle area of the connecting surface is smaller than the density of the corrugated texture in the edge area of the connecting surface.
  • the end cover assembly also includes a top cover, an upper plastic and a sealing member, the top cover is provided with a mounting hole, the mounting hole of the top cover passes through the top cover along the thickness direction of the top cover, the upper plastic is installed on the top side of the top cover, the upper plastic is provided with a connecting hole, the connecting hole passes through the upper plastic along the thickness direction of the upper plastic and is connected with the mounting hole of the top cover, the conductive voltage block is installed on the upper plastic, the matching hole of the conductive voltage block is connected with the connecting hole of the upper plastic, the pole is also penetrated through the mounting hole of the top cover and the connecting hole of the upper plastic, the sealing member is sleeved on the pole, and clamped between the pole and the hole wall of the mounting hole of the top cover.
  • the end cover assembly includes a positive electrode unit and a negative electrode unit, the positive electrode unit and the negative electrode unit are both installed on the top cover and spaced apart from each other, and the positive electrode unit and the negative electrode unit each include an upper plastic, a conductive voltage, a pole and a seal.
  • the present application provides an energy storage device, comprising a shell and any one of the above-mentioned end cover assemblies, wherein the end cover assembly is mounted on the shell.
  • the present application further provides an electrical device, comprising the above-mentioned energy storage device, wherein the energy storage device supplies power to the electrical device.
  • the conductive voltage block and the pole are fixedly connected by adopting a process combining riveting and welding, which can enhance the assembly stability between the conductive voltage block and the pole, thereby preventing the pole from loosening due to metal rebound and preventing the conductive voltage block from rotating relative to the pole during the use of the energy storage device, thereby improving the reliability of the energy storage device; at the same time, the upper surface of the conductive voltage block can be kept flat, so that the contact area between the conductive voltage block and the connecting piece of the energy storage device module is larger, which can improve the reliability of the assembly between the energy storage device and the energy storage device module.
  • FIG1 is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present application.
  • FIG2 is a schematic structural diagram of an end cover assembly in the energy storage device shown in FIG1 ;
  • FIG3 is a schematic diagram of the exploded structure of the end cover assembly shown in FIG2;
  • FIG4 is a schematic cross-sectional view of the end cover assembly shown in FIG2 after being cut along A-A;
  • FIG5 is a schematic diagram of the structure of the lower plastic, the top cover, the explosion-proof valve, the positive electrode stressor and the negative electrode stressor in the end cover assembly shown in FIG3;
  • FIG6 is a schematic diagram of the exploded structure of the positive electrode unit in the end cap assembly shown in FIG3;
  • FIG7 is a schematic diagram of the cross-sectional structure of the upper plastic of the positive electrode unit shown in FIG6 after being cut along B-B;
  • FIG8 is a schematic diagram of the cross-sectional structure of the conductive voltage block in the positive electrode unit shown in FIG6 after being cut along C-C;
  • FIG9 is an enlarged schematic diagram of the D region in FIG4 ;
  • FIG10 is a schematic diagram of the exploded structure of the negative electrode unit in the end cap assembly shown in FIG3;
  • FIG11 is a schematic cross-sectional structure diagram of the conductive voltage block of the negative electrode unit shown in FIG10 after being cut along the E-E line;
  • FIG. 12 is an enlarged schematic diagram of the F region in FIG. 4 .
  • Energy storage device 100 shell 110, end cover assembly 120, lower plastic 10, top cover 20, explosion-proof valve 30, positive stress member 40, negative stress member 50, positive electrode unit 60, negative electrode unit 70, explosion-proof fence 11, liquid inlet hole 101, first avoidance groove 102, second avoidance groove 103, first through hole 104, second through hole 105, explosion-proof hole 201, injection hole 202, first assembly hole 203, second assembly hole 204, first mounting hole 205, second mounting hole 206, first Upper plastic 61, first conductive voltage block 62, first pole 63, first seal 64, first adapter 65, first part 611, second part 612, first assembly groove 613, first avoidance hole 614, first identification through hole 615, first groove top wall 616, first groove bottom wall 617, identification part 611a, first installation groove 618, first communication hole 619, first extension part 621, first fixing part 622, first surface 623, second surface 624, first top surface 625, first connecting surface 630, first bottom surface 626, first matching hole 627, first step
  • Figure 1 is a schematic diagram of the structure of the energy storage device 100 provided in an embodiment of the present application.
  • the length direction of the energy storage device 100 is defined as the X-axis direction
  • the width direction of the energy storage device 100 is defined as the Y-axis direction
  • the height direction of the energy storage device 100 is defined as the Z-axis direction.
  • the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
  • the energy storage device 100 includes a housing 110, a battery cell (not shown) and an end cap assembly 120.
  • the housing 110 has an opening (not shown) and a receiving cavity (not shown).
  • the battery cell is received in the receiving cavity.
  • the receiving cavity is also used to receive an electrolyte, and the battery cell is immersed in the electrolyte.
  • the end cap assembly 120 is mounted on the top side of the housing 110 and closes the opening.
  • the energy storage device 100 is a square battery. In some other embodiments, the energy storage device 100 may also be a cylindrical battery or other batteries.
  • Figure 2 is a schematic diagram of the structure of the end cap assembly 120 in the energy storage device 100 shown in Figure 1
  • Figure 3 is a schematic diagram of the exploded structure of the end cap assembly 120 shown in Figure 2
  • Figure 4 is a schematic diagram of the cross-sectional structure of the end cap assembly 120 shown in Figure 2 after being cut along A-A.
  • "cut along A-A” means cutting along the plane where the A-A line is located, and similar descriptions in the following text can be understood in the same way.
  • the end cap assembly 120 includes a lower plastic 10, a top cover 20, an explosion-proof valve 30, a positive stressor 40, a negative stressor 50, a positive unit 60 and a negative unit 70.
  • the top cover 20 is installed on the top side of the lower plastic 10.
  • the explosion-proof valve 30, the positive stressor 40 and the negative stressor 50 are all installed on the top cover 20.
  • the positive stressor 40 and the negative stressor 50 are respectively located on opposite sides of the explosion-proof valve 30, and are both spaced apart from the explosion-proof valve 30.
  • the positive unit 60 and the negative unit 70 are both installed on the top cover 20, and are respectively located on opposite sides of the explosion-proof valve 30.
  • the positive unit 60 and the positive stressor 40 are located on the same side of the explosion-proof valve 30, and the positive unit 60 covers the positive stressor 40.
  • the negative electrode unit 70 and the negative electrode stressor 50 are located on the same side of the explosion-proof valve 30 , and the negative electrode unit 70 covers the negative electrode stressor 50 .
  • the positive stressor 40 and the negative stressor 50 can both undergo stress deformation in response to the pressure increase inside the energy storage device 100.
  • the positive stressor 40 and the negative stressor 50 can undergo stress deformation and contact the first conductive voltage block 62 of the positive electrode unit 60 and the second conductive voltage block 72 of the negative electrode unit 70 respectively, so that the positive electrode unit 60 and the negative electrode unit 70 are externally short-circuited.
  • the positive stressor 40 and the bottom of the first conductive voltage block 62 of the positive electrode unit 60 and the bottom of the second conductive voltage block 72 of the negative electrode unit 70 are melted and top-cut and return to the open circuit state, thereby avoiding overcharging of the energy storage device 100, thereby avoiding explosion of the energy storage device 100 and ensuring the safety and reliability of the energy storage device 100.
  • FIG. 5 is a schematic structural diagram of the lower plastic 10 , the top cover 20 , the explosion-proof valve 30 , the positive stressor 40 and the negative stressor 50 in the end cover assembly 120 shown in FIG. 3 .
  • the lower plastic 10 includes an explosion-proof fence 11, which penetrates the top surface (not marked in the figure) and the bottom surface (not marked in the figure) of the lower plastic 10. Among them, the explosion-proof fence 11 is located in the middle of the lower plastic 10.
  • the lower plastic 10 is provided with a liquid inlet hole 101, a first avoidance groove 102, a second avoidance groove 103, a first through hole 104 and a second through hole 105.
  • the liquid inlet hole 101 penetrates the lower plastic 10 along the thickness direction of the lower plastic 10 (Z-axis direction shown in the figure). Specifically, the liquid inlet hole 101 is located in the middle of the lower plastic 10 and is located at the explosion-proof fence. 11, and is spaced apart from the explosion-proof fence 11.
  • the liquid inlet hole 101 is a circular hole. In some other embodiments, the liquid inlet hole 101 can also be a square hole or other special-shaped holes.
  • the first avoidance groove 102 and the second avoidance groove 103 are respectively located on opposite sides of the explosion-proof fence 11, and are spaced apart from the explosion-proof fence 11, and are mirror-symmetrical about the explosion-proof fence 11.
  • the first avoidance groove 102 is located on the right side of the explosion-proof fence 11, and is located on the side of the liquid inlet hole 101 away from the explosion-proof fence 11, and is spaced apart from the liquid inlet hole 101.
  • the second avoidance groove 103 is located on the left side of the liquid inlet hole 101.
  • the openings of the first avoidance groove 102 and the second avoidance groove 103 are both located on the top surface of the lower plastic 10 (not marked in the figure).
  • the first avoidance groove 102 and the second avoidance groove 103 are both recessed from the top surface of the lower plastic 10 to the bottom surface (not marked in the figure) (in the negative direction of the Z axis shown in the figure).
  • the first avoidance groove 102 and the second avoidance groove 103 are both circular grooves.
  • the first avoidance groove 102 and the second avoidance groove 103 can also be square grooves or other special-shaped grooves.
  • the first through hole 104 is located on a side of the first avoidance groove 102 away from the liquid inlet hole 101, and is spaced apart from the first avoidance groove 102.
  • the second through hole 105 is located on a side of the second avoidance groove 103 away from the explosion-proof fence 11, and is spaced apart from the second avoidance groove 103.
  • the first through hole 104 and the second through hole 105 are mirror-symmetrical about the explosion-proof fence 11.
  • the first through hole 104 and the second through hole 105 both penetrate the lower plastic 10 along the thickness direction of the lower plastic 10.
  • the first through hole 104 and the second through hole 105 are both circular holes.
  • the first through hole 104 and the second through hole 105 may also be square holes or other special-shaped holes.
  • the top cover 20 is provided with an explosion-proof hole 201, a liquid injection hole 202, a first assembly hole 203, a second assembly hole 204 and a mounting hole.
  • the explosion-proof hole 201 penetrates the top cover 20 along the thickness direction of the top cover 20 (Z-axis direction shown in the figure).
  • the explosion-proof hole 201 is located in the middle of the top cover 20.
  • the explosion-proof hole 201 can be connected to the interior of the energy storage device 100 through the explosion-proof fence 11.
  • the explosion-proof hole 201 is an elliptical hole
  • the liquid injection hole 202 is a circular hole.
  • the explosion-proof hole 201 can be a circular hole, a square hole or other special-shaped holes.
  • the injection hole 202 is located in the middle of the top cover 20, and is located on the right side of the explosion-proof hole 201, and is spaced apart from the explosion-proof hole 201. Specifically, the injection hole 202 penetrates the top cover 20 along the thickness direction of the top cover 20. Among them, the injection hole 202 is connected to the liquid inlet hole 101 of the lower plastic 10.
  • the electrolyte can be injected into the receiving cavity of the shell 110 (as shown in Figure 1) through the injection hole 202 of the top cover 20 and the injection hole 202 of the lower plastic 10 in sequence to achieve the perfusion of the electrolyte of the energy storage device 100.
  • the injection hole 202 is a circular hole. In some other embodiments, the injection hole 202 can be a square hole or other special-shaped holes.
  • the first assembly hole 203 and the second assembly hole 204 are respectively located on opposite sides of the explosion-proof hole 201, and are spaced apart from the explosion-proof hole 201, and are mirror-symmetrical about the explosion-proof hole 201.
  • the first assembly hole 203 is located on the right side of the explosion-proof hole 201, and is located on the side of the injection hole 202 away from the explosion-proof hole 201, and is spaced apart from the explosion-proof hole 201.
  • the second assembly hole 204 is located on the left side of the liquid inlet hole 101. Specifically, the first assembly hole 203 and the second assembly hole 204 both penetrate the top cover 20 along the thickness direction of the top cover 20.
  • the first assembly hole 203 is connected to the first avoidance groove 102
  • the second assembly hole 204 is connected to the second avoidance groove 103.
  • the first assembly hole 203 and the second assembly hole 204 are both circular holes.
  • the first assembly hole 203 and the second assembly hole 204 can also be square holes or other special-shaped holes.
  • the mounting hole is located at the edge of the top cover 20, and is spaced apart from the first assembly hole 203 and the second assembly hole 204. Specifically, the mounting hole passes through the top cover 20 along the thickness direction of the top cover 20.
  • there are two mounting holes namely the first mounting hole 205 and the second mounting hole 206.
  • the first mounting hole 205 is located on the side of the first assembly hole 203 away from the injection hole 202, and is spaced apart from the first assembly hole 203.
  • the second mounting hole 206 is located on the side of the second assembly hole 204 away from the explosion-proof hole 201, and is spaced apart from the second assembly hole 204.
  • the first mounting hole 205 and the second mounting hole 206 The explosion-proof hole 201 is mirror-symmetrical.
  • the first mounting hole 205 is connected to the first through hole 104 of the lower plastic 10
  • the second mounting hole 206 is connected to the second through hole 105 of the lower plastic 10.
  • the first mounting hole 205 and the second mounting hole 206 are both circular holes.
  • the first mounting hole 205 and the second mounting hole 206 can also be square holes or other special-shaped holes.
  • the explosion-proof valve 30 is installed in the explosion-proof hole 201 and fixedly connected to the hole wall of the explosion-proof hole 201.
  • the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 201 by welding to be installed in the explosion-proof hole 201.
  • the explosion-proof hole 201 connects the inside and outside of the energy storage device 100, when the air pressure inside the energy storage device 100 is too high, the explosion-proof valve 30 will rupture under the action of the air pressure, and the gas inside the energy storage device 100 can be discharged to the outside of the energy storage device 100 in time through the explosion-proof fence 11 of the lower plastic 10 and the explosion-proof hole 201 in turn, so as to avoid the explosion of the energy storage device 100 and improve the reliability of the use of the energy storage device 100.
  • the positive stressor 40 is installed in the first assembly hole 203 and fixedly connected to the hole wall of the first assembly hole 203.
  • the negative stressor 50 is installed in the second assembly hole 204 and fixedly connected to the hole wall of the second assembly hole 204.
  • the first avoidance groove 102 can avoid the positive stressor 40
  • the second avoidance groove 103 can avoid the negative stressor 50.
  • the positive stressor 40 can be fixedly connected to the hole wall of the first assembly hole 203 by welding to be installed in the first assembly hole 203
  • the negative stressor 50 can be fixedly connected to the hole wall of the second assembly hole 204 by welding to be installed in the second assembly hole 204.
  • Figure 6 is a schematic diagram of the exploded structure of the positive electrode unit 60 in the end cover assembly 120 shown in Figure 3
  • Figure 7 is a schematic diagram of the cross-sectional structure of the first upper plastic 61 in the positive electrode unit 60 shown in Figure 6 after being cut along B-B.
  • the positive electrode unit 60 includes a first upper plastic 61, a first conductive voltage block 62, a first pole 63, a first seal 64 and a first adapter 65.
  • the first upper plastic 61 is installed on the top side of the top cover 20.
  • the first upper plastic 61 includes a first part 611 and a second part 612, and the second part 612 is fixedly connected to the right side of the first part 611.
  • the first part 611 is provided with a first assembly groove 613, a first avoidance hole 614 and a first identification through hole 615.
  • the opening of the first assembly groove 613 is located on the right side of the first part 611 (not marked in the figure).
  • the first assembly groove 613 is recessed from the right side of the first part 611 to the left side (not marked in the figure) (in the negative direction of the X axis in the figure).
  • the first assembly groove 613 includes a first groove top wall surface 616 and a first groove bottom wall surface 617.
  • the first groove top wall surface 616 and the first groove bottom wall surface 617 are spaced and arranged oppositely.
  • the opening of the first avoidance hole 614 is located on the bottom surface of the first part 611 (not marked in the figure). Specifically, the opening of the first avoidance hole 614 is located in the middle area of the bottom surface of the first part 611.
  • the first avoidance hole 614 is recessed from the bottom surface of the first part 611 in the direction of the first assembly groove 613 (the positive direction of the Z axis shown in the figure), and passes through the first groove bottom wall 617 of the first assembly groove 613 to communicate with the first assembly groove 613.
  • the first avoidance hole 614 is arranged opposite to the positive electrode stressor 40.
  • the first avoidance hole 614 is a circular hole. In some other embodiments, the first avoidance hole 614 may also be a square hole or other special-shaped holes.
  • the opening of the first identification through hole 615 is located on the top surface of the first part 611 (not marked in the figure). Specifically, the opening of the first identification through hole 615 is located in the middle area of the top surface of the first part 611.
  • the first identification through hole 615 is recessed from the top surface of the first part 611 in the direction of the first assembly slot 613 (the negative direction of the Z axis shown in the figure), and passes through the first slot top wall 616 of the first assembly slot 613 to communicate with the first assembly slot 613.
  • the first identification through hole 615 is in the shape of a "cross" to indicate that the polarity of the positive electrode unit 60 is positive. In some other embodiments, the first identification through hole 615 can also be in other shapes, as long as it can indicate that the polarity of the positive electrode unit 60 is positive.
  • the first part 611 includes an identification portion 611a, which is located at one end of the first part 611 away from the second part 612 to identify the polarity of the positive electrode unit 60.
  • the identification portion 611a is chamfered.
  • the operator or intelligent equipment can quickly identify the first upper plastic 61 of the positive electrode unit 60 based on the identification portion 611a to distinguish it from the second upper plastic 71 of the negative electrode unit 70, thereby improving assembly efficiency.
  • the design of the identification portion 611a can serve as a fool-proof structure for the first upper plastic 61 to prevent the operator from confusing the first upper plastic 61 of the positive electrode unit 60 with the second upper plastic 71 of the negative electrode unit 70.
  • the second part 612 is provided with a first mounting groove 618 and a first communicating hole 619.
  • the opening of the first mounting groove 618 is located on the top surface (not marked in the figure) of the second part 612.
  • the first mounting groove 618 is recessed in a direction (negative direction of the Z axis in the figure) from the top surface to the bottom surface (not marked in the figure) of the second part 612, and is communicated with the first assembly groove 613.
  • the first mounting groove 618 includes a groove bottom wall surface (not marked in the figure).
  • the first connecting hole 619 penetrates the second part 612 along the thickness direction of the second part 612. Specifically, the opening of the first connecting hole 619 is located at the bottom surface of the second part 612.
  • the first connecting hole 619 is recessed from the bottom surface of the second part 612 in the direction of the first mounting groove 618 (the positive direction of the Z axis shown in the figure), and penetrates the bottom wall of the first mounting groove 618 to communicate with the first mounting groove 618.
  • the first connecting hole 619 is connected to the first mounting hole 205 of the top cover 20.
  • the first connecting hole 619 is a circular hole.
  • the first connecting hole 619 can also be a square hole or other special-shaped holes.
  • the first conductive voltage block 62 is installed on the first upper plastic 61.
  • the first conductive voltage block 62 can be made of aluminum.
  • the first conductive voltage block 62 includes a first extension portion 621 and a first fixed portion 622, and the first fixed portion 622 is fixedly connected to the right side of the first extension portion 621.
  • the first extension portion 621 includes a first surface 623 and a second surface 624, and the first surface 623 and the second surface 624 are arranged opposite to each other.
  • the first surface 623 and the second surface 624 are both planes.
  • the first extension portion 621 is installed in the first assembly groove 613, and covers the first avoidance hole 614 and the first identification through hole 615 of the first upper plastic 61.
  • the first extension portion 621 is interference fit with the first assembly groove 613.
  • the first surface 623 of the first extension portion 621 abuts against the first groove top wall surface 616 of the first assembly groove 613, and covers the first identification through hole 615 of the first upper plastic 61.
  • the second surface 624 of the first extension portion 621 abuts against the first groove bottom wall surface 617 of the first assembly groove 613, and covers the first avoidance hole 614 of the first upper plastic 61.
  • the first surface 623 of the first extension part 621 is bright silver
  • the first upper plastic 61 is black
  • the first identification through hole 615 exposes the first surface 623 of the first extension part 621
  • a positive electrode identification "+" with a strong color difference can be formed, thereby identifying the polarity of the positive electrode unit 60.
  • the first extension part 621 and the first assembly groove 613 are interference-fitted, the first surface 623 of the first extension part 621 and the first groove top wall surface 616 of the first assembly groove 613 are closely fitted without a gap, and the first identification through hole 615 will not be suspended in the air and form a shadow on the first surface 623 of the first extension part 621, thereby improving the recognition of the polarity identification.
  • the thickness of the first fixed portion 622 is greater than the thickness of the first extending portion 621.
  • the first fixed portion 622 includes a first top surface 625 and a first bottom surface 626, and the first top surface 625 and the first bottom surface 626 are arranged opposite to each other.
  • the first bottom surface 626 of the first fixed portion 622 is flush with the second surface 624 of the first extending portion 621, and the first top surface 625 of the first fixed portion 622 protrudes relative to the first surface 623 of the first extending portion 621.
  • the first top surface 625 of the first fixed portion 622 is the first connecting surface 630, and is used for welding with the connecting piece.
  • the first connecting surface 630 is a rough surface, and its roughness is between Ra 0.8 and Ra 6.3 (including the endpoint values Ra 0.8 and Ra 6.3), for example, the roughness is Ra0.8, Ra1.6, Ra3.2 or Ra6.3.
  • a part of the first top surface 625 of the first fixed portion 622 may be the first connecting surface 630, and the embodiment of the present application does not make specific restrictions on this.
  • the first connecting surface 630 is a rough surface, which can ensure that there will be no reflection interference between the first conductive voltage block 62 during the welding process, thereby facilitating the welding of the connecting piece and the first conductive voltage block 62;
  • the roughness of the first connecting surface 630 is set between Ra 0.8 and Ra 6.3 (including endpoint values Ra 0.8 and Ra 6.3), which can avoid the surface gap of the first connecting surface 630 being too large, thereby ensuring that the contact area between the first connecting surface 630 and the connecting piece is large, thereby preventing poor conductive contact.
  • roughness refers to the unevenness of the machined surface with small spacing and tiny peaks and valleys.
  • the distance (wave distance) between two peaks or two valleys is very small (less than 1mm), which belongs to the microscopic geometric shape error.
  • the roughness value is 3.2, which means that the arithmetic average of the unevenness of any ten points on the machined surface is 3.2 microns.
  • the first connection surface 630 may be composed of any one or more patterns that can increase the surface roughness, such as a tooth-shaped continuous structure and a microporous structure distributed at intervals.
  • the first connection surface 630 has a corrugated texture.
  • the density of the corrugated texture in the middle area of the first connection surface 630 is less than the density of the corrugated texture in the edge area of the first connection surface 630.
  • the middle area of the first connection surface 630 is the area welded to the connecting piece, and the corrugated texture in the middle area of the first connection surface 630 is clearer than the corrugated texture in the edge area of the first connection surface 630, which can increase the contact area between the solder and the middle area of the first connection surface 630, and help to improve the welding stability between the first conductive voltage block 62 and the connecting piece.
  • FIG. 8 is a schematic diagram of the cross-sectional structure of the first conductive voltage block 62 in the positive electrode unit 60 shown in FIG. 6 after being cut along C-C.
  • the first fixing portion 622 is provided with a first matching hole 627, and the first matching hole 627 is located in the middle of the first fixing portion 622.
  • the first matching hole 627 penetrates the first fixing portion 622 along the thickness direction of the first fixing portion 622 (Z-axis direction in the figure).
  • the first matching hole 627 is a circular hole.
  • the first matching hole 627 can also be a square hole or other special-shaped holes.
  • the first matching hole 627 includes a first step portion 627a and a first mounting portion 627b, and the first mounting portion 627b is located at the bottom side of the first step portion 627a and is connected to the first step portion 627a.
  • the ratio of the diameter d1 of the first step portion 627a to the diameter d2 of the first mounting portion 627b is d1 : d2 between 2.4 and 1.05 (including the endpoints 2.4 and 1.05), for example, the ratio is 2.4, 1.8, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.15 or 1.05. It should be noted that the diameter d1 of the first step portion 627a refers to the diameter value d1 of the surface of the first step portion 627a.
  • the depth d4 of the first step portion 627a is between 0.1 mm and 2.8 mm (including endpoint values 0.1 mm and 2.8 mm), for example, the depth d4 of the first step portion 627a can be 0.1 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm or 2.8 mm.
  • the line width d3 of the annular surface of the first step portion 627a is between 0.15 mm and 4.2 mm (including endpoint values 0.15 mm and 4.2 mm), for example, the line width d3 of the annular surface of the first step portion 627a can be 0.15 mm, 0.85 mm, 1.32 mm, 2.25 mm, 3.45 mm, 3.85 mm or 4.2 mm.
  • the depth of the first step portion 627a will not be too large, which is convenient for welding the first pole 63 to the first step portion 627a, and can ensure that the height of the first conductive block 62 and the first pole 63 after welding will not be higher than the first top surface 625 of the first conductive block 62, and can ensure the structural strength of the first step portion 627a, avoiding the reduction of the connection stability between the first step portion 627a and the first pole 63 due to deformation of the first step portion 627a.
  • the width of the first step portion 627a is less than 4.2 mm, which can increase the contact area between the first top surface 625 of the first conductive block 62 and the connecting piece of the energy storage device module, avoiding poor conductive contact caused by the excessively large aperture of the first step portion 627a.
  • the first fixing part 622 is installed in the first installation groove 618, and the first matching hole 627 of the first fixing part 622 is connected to the first connecting hole 619 of the first upper plastic 61.
  • the first top surface 625 of the first fixing part 622 protrudes relative to the top surface of the first part 611 in the first upper plastic 61, and the peripheral surface of the first fixing part 622 is spaced from the surface of the first part 611 facing the second part 612 (i.e., the right side surface of the first part 611).
  • first top surface 625 of the first fixing part 622 protrudes relative to the top surface of the first part 611 in the first upper plastic 61, when the connecting piece is welded to the first top surface 625 of the first fixing part 622, it can not only prevent the connecting piece from scratching or scratching the first part 611 of the first upper plastic 61, thereby ensuring the reliability of the energy storage device 100, but also prevent the connecting piece from warping.
  • the first fixing portion 622 includes an assembly portion 628 and a connecting portion 629, and the connecting portion 629 is fixedly connected to the top side of the assembly portion 628.
  • the peripheral surface of the connecting portion 629 is arranged around the peripheral surface of the assembly portion 628, and protrudes relative to the peripheral surface of the assembly portion 628.
  • the bottom surface of the assembly portion 628 is the bottom surface of the first fixing portion 622
  • the top surface of the connecting portion 629 is the top surface of the first fixing portion 622.
  • the assembly portion 628 is installed in the first installation groove 618, and the connecting portion 629 protrudes relative to the first installation groove 618 and abuts against the top surface of the second portion 612 in the first upper plastic 61.
  • the right side surfaces of the first portion 611 in the first upper plastic 61 are spaced and arranged opposite to each other. It should be understood that the gap between the right side surface of the first portion 611 in the first upper plastic 61 and the peripheral surface of the connecting portion 629 can be used as an error accommodating area.
  • the first upper plastic 61 shrinks due to heat shrinkage, the first upper plastic 61 and the first conductive voltage block 62 can still be assembled in place, thereby ensuring the assembly reliability between the first upper plastic 61 and the first conductive voltage block 62.
  • FIG. 9 is an enlarged schematic diagram of the D area in FIG. 4 .
  • the first pole 63 includes a positive electrode flange 631 and a positive electrode mounting portion 632, and the positive electrode mounting portion 632 is located on the top side of the positive electrode flange 631.
  • the positive electrode mounting portion 632 is penetrated through the first through hole 104 of the lower plastic 10, the first mounting hole 205 of the top cover 20, the first connecting hole 619 of the first upper plastic 61, and the first matching hole 627 of the first conductive voltage block 62, and is fixedly connected to the hole wall of the first matching hole 627 of the first conductive voltage block 62.
  • the positive electrode flange 631 can be located on the inner side of the lower plastic 10, and the top surface of the positive electrode flange 631 can abut against the lower plastic 10.
  • the positive electrode mounting portion 632 includes a first rivet portion 633 and a first column portion 634, wherein the first column portion 634 is located between the bottom side of the first rivet portion 633 and the top side of the positive electrode flange portion 631. Specifically, the first column portion 634 is mounted on the first mounting portion 627b of the first matching hole 627, and the first rivet portion 633 is mounted on the first step portion 627a of the first matching hole 627. The outer edge of the first rivet portion 633 is fixed to the first step portion 627a by welding, and a first welding portion 635 is formed.
  • the assembly portion when the first pole 63 is not riveted to the first conductive block 62, the end of the positive electrode mounting portion 632 of the first pole 63 away from the positive electrode flange portion 631 is the assembly portion, and the assembly portion is located at the first step portion 627a of the first matching hole 627.
  • the assembly portion In the process of riveting the first pole 63 to the first conductive block 62, the assembly portion is deformed by the external force to form the first riveted portion 633; the outer edge of the first riveted portion 633 is welded to the hole wall of the first step portion 627a to form the first welding portion 635 connected between the first riveted portion 633 and the hole wall of the first step portion 627a.
  • the first step portion 627a has a certain depth and depth.
  • the first riveted portion 633 and the first welding portion 635 can be completely accommodated in the first step portion 627a, and the overall height of the first riveted portion 633 and the first welding portion 635 is not higher than the depth of the first step portion 627a.
  • the top surface of the first rivet portion 633 is flush with the first connection surface 630, or the top surface of the first rivet portion 633 is lower than the first connection surface 630; or the top surface of the first welding portion 635 is flush with the first connection surface 630, or the top surface of the first welding portion 635 is lower than the first connection surface 630.
  • the top surface of the first welding portion 635 is an undulating surface rather than a regular plane, so the top surface of the first welding portion 635 described in this application refers to the plane where the highest position of the upper surface of the first welding portion 635 is located.
  • the first step portion 627a has a certain width, which can ensure that the first rivet portion 633 can be completely abutted against the first step portion 627a, and prevent the first rivet portion 633 from bending at the side wall of the first step portion 627a and protruding from the first top surface 625 of the first conductive voltage block 62, thereby controlling the welding area of the first rivet portion 633 and the first step portion 627a to be on the bottom wall of the hole of the first step portion 627a, which is convenient for welding the first rivet portion 633 and the first step portion 627a, and can also increase the first
  • the contact area between the pole 63 and the first conductive voltage block 62 makes the conductivity between the first pole 63 and the first conductive voltage block 62 better; on the other hand, the first step portion 627a of the conductive voltage block has a certain depth, which can ensure that the first rivet portion 633 and the first welding portion 635 of the first pole 63 will not protrude from the first top surface 625
  • the first conductive voltage block 62 and the first pole 63 are fixedly connected by using a combination of riveting and welding, which can enhance the assembly stability between the first conductive voltage block 62 and the first pole 63, thereby preventing the first pole 63 from loosening due to metal rebound and preventing the first conductive voltage block 62 from rotating relative to the first pole 63 during the use of the energy storage device 100, thereby improving the reliability of the energy storage device 100; at the same time, the upper surface of the first conductive voltage block 62 can be kept flat, so that the contact area between the first conductive voltage block 62 and the connecting piece of the energy storage device 100 is larger, which can improve the reliability of the energy storage device 100 and the energy storage device 100. Can ensure the reliability of module assembly.
  • the first sealing member 64 includes a first sealing portion 641 and a second sealing portion 642, wherein the second sealing portion 642 is fixedly connected to the bottom of the first sealing portion 641 and is arranged around the first sealing portion 641. Specifically, the first sealing member 64 is sleeved on the positive electrode mounting portion 632 of the first pole 63.
  • the top surface (not marked in the figure) of the first sealing portion 641 is against the bottom surface of the first upper plastic 61, part of the first sealing portion 641 is clamped between the positive electrode mounting portion 632 of the first pole 63 and the hole wall of the first mounting hole 205 of the top cover 20, and part of the first sealing portion 641 is clamped between the positive electrode mounting portion 632 of the first pole 63 and the hole wall of the first through hole 104 of the lower plastic 10.
  • the second sealing portion 642 can be located inside the lower plastic 10, and can be clamped between the lower plastic 10 and the positive electrode flange portion 631 of the first pole 63.
  • first seal 64 can not only ensure the assembly stability between the first pole 63 and the lower plastic 10 and the top cover 20 , but also prevent the first pole 63 and the top cover 20 from direct contact and conduction, thereby achieving insulation between the first pole 63 and the top cover 20 .
  • the first adapter 65 is installed on the inner side of the lower plastic 10 and is located on the side of the positive flange 631 of the first pole 63 away from the first column 634. Specifically, one end of the first adapter 65 is electrically connected to the positive flange 631 of the first pole 63, and the other end is electrically connected to the positive ear of the battery cell. Exemplarily, the first adapter 65 can be electrically connected to the positive flange 631 of the first pole 63 and/or the positive ear of the battery cell by welding.
  • FIG. 10 is a schematic diagram of the exploded structure of the negative electrode unit 70 in the end cover assembly 120 shown in FIG. 3 .
  • the negative electrode unit 70 includes a second upper plastic 71, a second conductive voltage block 72, a second pole 73, a second seal 74, and a second adapter 75.
  • the structures of the components in the negative electrode unit 70, the assembly relationship between the components, and the assembly relationship between the components and the lower plastic 10 and the top cover 20 can all be referred to the relevant description of the positive electrode unit 60 above, and will not be repeated here.
  • the second upper plastic 71 is installed on the top side of the top cover 20, and is located on the left side of the first upper plastic 61, and is spaced apart from the first upper plastic 61.
  • the second upper plastic 71 includes a third part 711 and a fourth part 712, and the fourth part 712 is fixedly connected to the left side of the third part 711.
  • the third part 711 is provided with a second assembly groove 713, a second avoidance hole 714, and a second identification through hole 715.
  • the fourth part 712 is provided with a second mounting groove 718 and a second connecting hole 719. Among them, the second connecting hole 719 is connected to the second mounting hole 206 of the top cover 20.
  • the second assembly groove 713 includes a second groove top wall surface 716 and a second groove bottom wall surface 717.
  • the second avoidance hole 714 is arranged opposite to the negative electrode stressor 50.
  • the second identification through hole 715 is in the shape of a "one" to indicate that the polarity of the negative electrode unit 70 is negative. In some other embodiments, the second identification through hole 715 may also be in other shapes as long as it can identify the polarity of the negative electrode unit 70 as negative.
  • the third portion 711 may also include an identification portion (not shown), which is used to identify the polarity of the negative electrode unit 70.
  • the identification portion of the third portion 711 is different from the identification portion 611a of the first portion 611, so that the operator can distinguish the second upper plastic 71 of the negative electrode unit 70 from the first upper plastic 61 of the positive electrode unit 60.
  • an identification through hole is opened on the first part of the upper plastic, and the first part of the upper plastic is used to cooperate with the first part of the conductive voltage block to form a strong color difference between the first part of the conductive voltage block and the first part of the upper plastic, so as to realize the polarity identification of the positive electrode unit 60 and the negative electrode unit 70, without adding positive electrode rivets or negative electrode rivets and other components to identify the polarity, thereby reducing the number of accessories of the end cover assembly 120 and the structural complexity of the end cover assembly 120, which is conducive to realizing a lightweight design of the energy storage device 100.
  • the second conductive block 72 is installed on the second upper plastic 71.
  • the second conductive block 72 includes a second extension portion 721 and a second fixing portion 722, and the second fixing portion 722 is fixedly connected to the left side of the second extension portion 721.
  • the second extension portion 721 is installed in the second assembly groove 713
  • the second fixing portion 722 is installed in the second installation groove 718
  • the second matching hole 727 of the second fixing portion 722 is connected to the second connecting hole 719 of the fourth portion 712.
  • the portion 721 is interference fit with the second assembly groove 713.
  • the third surface 723 of the second extension portion 721 abuts against the second groove top wall surface 716 of the second assembly groove 713 and covers the second identification through hole 715 of the second upper plastic 71.
  • the fourth surface 724 of the second extension portion 721 abuts against the second groove bottom wall surface 717 of the second assembly groove 713 and covers the second avoidance hole 714 of the second upper plastic 71.
  • the second identification through hole 715 exposes the second top surface 725 of the second fixed portion 722 , and a positive electrode identification “-” with a strong color difference can be formed, thereby identifying the polarity of the negative electrode unit 70 .
  • the positive stressor 40 and the negative stressor 50 are both pushed to flip by the air pressure, and the positive stressor 40 passes through the second avoidance hole 714 and contacts the second fixed part 722, so that the top cover 20 is electrically connected to the second conductive voltage block 72, and the negative stressor 50 passes through the second avoidance hole 714 and contacts the second fixed part 722, so that the top cover 20 is electrically connected to the second conductive voltage block 72, so that the positive electrode unit 60 and the negative electrode unit 70 are turned on and a short circuit occurs, and the energy storage device 100 cannot work normally, and the air pressure inside the energy storage device 100 cannot be further increased, thereby improving the reliability of the energy storage device 100.
  • the second top surface 725 of the second fixed portion 722 is a second connecting surface 730, which is used for welding with the connecting piece.
  • the second connecting surface 730 is a rough surface, and its roughness is between Ra 0.8 and Ra 6.3 (including the endpoint values Ra 0.8 and Ra 6.3).
  • the roughness of the second connecting surface 730 is Ra 3.2.
  • a partial area of the second top surface 725 of the second fixed portion 722 may be the second connecting surface 730, and the embodiment of the present application does not impose specific restrictions on this.
  • the second connecting surface 730 is a rough surface, which can ensure that there will be no reflection interference between the second conductive voltage block 72 during the welding process, thereby facilitating the welding of the connecting piece and the second conductive voltage block 72;
  • the roughness of the second connecting surface 730 is set between Ra 0.8 and Ra 6.3 (including endpoint values Ra 0.8 and Ra 6.3), for example, the roughness is Ra 0.8, Ra 1.6, Ra 3.2 or Ra 6.3, which can avoid the surface gap of the second connecting surface 730 being too large, thereby ensuring that the contact area between the second connecting surface 730 and the connecting piece is large, thereby preventing poor conductive contact.
  • the second connection surface 730 may be composed of any one or more patterns that can increase the surface roughness, such as a tooth-like continuous structure and a microporous structure distributed at intervals.
  • the second connection surface 730 has a corrugated texture.
  • the density of the corrugated texture in the middle area of the second connection surface 730 is less than the density of the corrugated texture in the edge area of the second connection surface 730.
  • the middle area of the second connection surface 730 is the area welded to the connecting piece, and the corrugated texture in the middle area of the second connection surface 730 is clearer than the corrugated texture in the edge area of the second connection surface 730, which can increase the contact area between the solder and the middle area of the second connection surface 730, and help to improve the welding stability between the second conductive voltage block 72 and the connecting piece.
  • FIG. 11 is a schematic diagram of the cross-sectional structure of the second conductive voltage block 72 of the negative electrode unit 70 shown in FIG. 10 after being cut along E-E.
  • the second matching hole 727 of the second fixing portion 722 includes a second step portion 727a and a second mounting portion 727b, wherein the second mounting portion 727b is located at the bottom side of the second step portion 727a and communicates with the second step portion 727a.
  • the ratio d1 : d2 of the diameter d1 of the second step portion 727a and the diameter d2 of the second mounting portion 727b is between 2.4 and 1.05 (including the endpoint values 2.4 and 1.05), for example, the ratio is 2.4, 1.8, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.15 or 1.05.
  • the depth d4 of the second step portion 727a is between 0.1 mm and 2.8 mm (including endpoint values 0.1 mm and 2.8 mm), for example, the depth d4 of the second step portion 727a can be 0.1 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm or 2.8 mm.
  • the line width d3 of the annular surface of the second step portion 727a is between 0.15 mm and 4.2 mm (including endpoint values 0.15 mm and 4.2 mm), for example, the line width d3 of the annular surface of the second step portion 727a can be 0.15 mm, 0.85 mm, 1.32 mm, 2.25 mm, 3.45 mm, 3.85 mm or 4.2 mm.
  • the depth of the second step portion 727a will not be too large, which is convenient for welding the second pole 73 to the second step portion 727a, and can ensure that the height of the second conductive block 72 and the second pole 73 after welding will not be higher than the second top surface 725 of the second conductive block 72, and can also ensure the structural strength of the second step portion 727a, avoiding the reduction of the connection stability between the second step portion 727a and the second pole 73 due to the deformation of the second step portion 727a.
  • the width of the second step portion 727a is less than 4.2 mm, which can increase the second top surface 725 of the second conductive block 72. The contact area with the connecting piece of the energy storage device module avoids poor conductive contact caused by the excessively large aperture of the second step portion 727a.
  • FIG. 12 is an enlarged schematic diagram of the F area in FIG. 4 .
  • the second pole 73 includes a negative electrode flange portion 731 and a negative electrode mounting portion 732, and the negative electrode mounting portion 732 is fixedly connected to the top side of the negative electrode flange portion 731.
  • the negative electrode mounting portion 732 is penetrated through the second through hole 105 of the lower plastic 10, the second mounting hole 206 of the top cover 20, the second connecting hole 719 of the second upper plastic 71, and the second matching hole 727 of the second conductive voltage block 72, and is fixedly connected to the hole wall of the second matching hole 727 of the second conductive voltage block 72.
  • the negative electrode mounting portion 732 includes a second rivet portion 733 and a second column portion 734, and the second column portion 734 is fixedly connected between the bottom side of the second rivet portion 733 and the top side of the negative electrode flange portion 731.
  • the second column portion 734 is mounted on the second mounting portion 727b of the second matching hole 727
  • the second rivet portion 733 is mounted on the second step portion 727a of the second matching hole 727.
  • the outer edge of the second rivet portion 733 is fixed to the second step portion 727a by welding, and a second welding portion 735 is formed.
  • the assembly portion when the second pole 73 is not riveted to the second conductive block 72, the end of the negative mounting portion 732 of the second pole 73 away from the negative flange portion 731 is the assembly portion, and the assembly portion is located at the second step portion 727a of the second matching hole 727.
  • the assembly portion In the process of riveting the second pole 73 to the second conductive block 72, the assembly portion is deformed by the external force to form the second riveted portion 733; the second riveted portion 733 is welded to the hole wall of the second step portion 727a to form the second welding portion 735 connected between the second riveted portion 733 and the hole wall of the second step portion 727a. It can be understood that the second step portion 727a has a certain depth.
  • the second riveted portion 733 and the second welding portion 735 can be completely accommodated in the second step portion 727a, and the overall height of the second riveted portion 733 and the second welding portion 735 is not higher than the depth of the second step portion 727a. It can be understood that the top surface of the second rivet portion 733 is flush with the second connection surface 730, or the top surface of the second rivet portion 733 is lower than the second connection surface 730; or the top surface of the second welding portion 735 is flush with the second connection surface 730, or the top surface of the second welding portion 735 is lower than the second connection surface 730.
  • the top surface of the second welding portion 735 is an undulating surface rather than a regular plane, so the top surface of the second welding portion 735 described in this application refers to the plane where the highest position of the upper surface of the second welding portion 735 is located.
  • the second step portion 727a has a certain width, which can ensure that the second rivet portion 733 can be completely abutted against the second step portion 727a, and prevent the second rivet portion 733 from bending on the side wall of the second step portion 727a and protruding from the second top surface 725 of the second conductive voltage block 72, thereby controlling the welding area of the second rivet portion 733 and the second step portion 727a on the bottom wall of the hole of the second step portion 727a, facilitating the welding of the second rivet portion 733 and the second step portion 727a, and increasing the width of the second pole.
  • the second step portion 727a of the second conductive voltage block 72 has a certain depth, which can ensure that the second rivet portion 733 and the second welding portion 735 of the second pole 73 will not protrude from the second top surface 725 of the second conductive voltage block 72, thereby increasing the contact area between the connecting piece and the second connecting surface 730 of the second conductive voltage block 72, thereby enhancing the assembly stability between the connecting piece and the second conductive voltage block 72.
  • the second sealing member 74 includes a third sealing portion 741 and a fourth sealing portion 742, wherein the fourth sealing portion 742 is fixedly connected to the bottom of the third sealing portion 741 and is disposed around the third sealing portion 741.
  • the top surface (not shown) of the third sealing portion 741 abuts against the bottom surface of the second upper plastic 71, a portion of the third sealing portion 741 is clamped between the second column portion 734 of the second pole 73 and the hole wall of the second mounting hole 206 of the top cover 20, and a portion of the third sealing portion 741 is clamped between the second column portion 734 of the second pole 73 and the hole wall of the second through hole 105 of the lower plastic 10.
  • the second adapter 75 is installed on the inner side of the lower plastic 10 and is located on the side of the negative flange 731 of the second pole 73 away from the second column 734. Specifically, one end of the second adapter 75 is electrically connected to the negative flange 731 of the second pole 73, and the other end is electrically connected to the negative ear of the battery cell. Exemplarily, the second adapter 75 can be electrically connected to the second pole by welding. The negative electrode flange 731 of 73 and/or the positive electrode ear of the battery cell.
  • the conductive voltage blocks in the positive electrode unit 60 and the negative electrode unit 70 are fixedly connected to the poles by a process combining riveting and welding, so that the assembly stability between the conductive voltage blocks and the poles is enhanced, thereby preventing the poles from loosening due to metal rebound and preventing the conductive voltage blocks from rotating relative to the poles during the use of the energy storage device 100, thereby improving the reliability of the use of the energy storage device 100; at the same time, the upper surfaces of the conductive voltage blocks in the positive electrode unit 60 and the negative electrode unit 70 can be kept flat, so that the contact area between the conductive voltage blocks and the connecting sheet is larger, thereby improving the reliability of the assembly of the energy storage device 100 and the energy storage device module.
  • the energy storage device 100 may also be a device having the function of storing electricity, such as a battery module, a battery pack or a battery system.
  • the energy storage device 100 is a battery module
  • the battery module includes a plurality of single cells and a plurality of connecting plates, each connecting plate being electrically connected between two single cells.
  • the single cell may adopt the structure shown in the energy storage device 100 shown in the above embodiment.
  • the multiple single cells may be arranged in series, one end of each connecting plate is electrically connected to the positive electrode unit of a single cell, and the other end is electrically connected to the negative electrode unit of another single cell.
  • the multiple single cells may also be arranged in parallel, with some connecting plates being electrically connected between the positive electrode units of two single cells, and some connecting plates being electrically connected between the negative electrode units of two single cells.
  • the connecting plate may be an aluminum bar. It should be noted that some single cells may also be arranged in series, and some single cells may be arranged in parallel. The embodiments of the present application do not specifically limit the connection method of multiple single cells in the battery pack.
  • the present application also provides an electric device, which includes the energy storage device 100, and the energy storage device 100 supplies power to the electric device.
  • the electric device may be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente demande propose un ensemble capuchon d'extrémité, un appareil de stockage d'énergie et un dispositif électrique. Au moyen de la combinaison de processus de rivetage et de soudage, un montant de borne et un bloc de pression électroconducteur sont connectés de manière fixe, ce qui améliore la stabilité de l'assemblage entre le montant de borne et le bloc de pression électroconducteur, et améliore la fiabilité d'utilisation de l'appareil de stockage d'énergie. L'ensemble capuchon d'extrémité comprend un bloc de pression électroconducteur et un montant de borne. Le bloc de pression électroconducteur est pourvu d'un trou d'ajustement, le trou d'ajustement du bloc de pression électroconducteur pénétrant dans le bloc de pression électroconducteur dans la direction de l'épaisseur du bloc de pression électroconducteur ; et le trou d'ajustement comprend une partie étagée et une partie de montage, la partie de montage étant située sur le côté inférieur de la partie étagée et étant en communication avec la partie étagée, et le rapport du diamètre de la partie étagée au diamètre de la partie de montage étant compris entre 2,4 et 1,05. Le montant de borne pénètre dans le trou d'ajustement du bloc de pression électroconducteur, et comprend une partie de rivetage et une partie de corps de montant, la partie de rivetage étant montée sur la partie étagée ; la partie de corps de montant est située sur le côté inférieur de la partie de rivetage et montée sur la partie de montage ; et un bord externe de la partie de rivetage du montant de borne est fixé à la partie étagée du bloc de pression électroconducteur au moyen d'un soudage, et une partie soudée est formée.
PCT/CN2023/075273 2023-02-09 2023-02-09 Ensemble capuchon d'extrémité, appareil de stockage d'énergie et dispositif électrique Ceased WO2024164261A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2013031669A1 (fr) * 2011-08-31 2013-03-07 三洋電機株式会社 Batterie et procédé de fabrication de cette dernière
CN108428818A (zh) * 2017-02-13 2018-08-21 宁德时代新能源科技股份有限公司 动力电池顶盖结构、动力电池及电池模组
CN218005055U (zh) * 2022-07-01 2022-12-09 比亚迪股份有限公司 电池盖板、电池和车辆
CN217934002U (zh) * 2022-08-29 2022-11-29 柳州鹏辉能源科技有限公司 电池盖板及电池

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