Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack, and the battery cell mainly comprises a shell, a pair of pole columns and a pair of connecting sheets. A pair of mounting holes and a pair of first through holes are formed in the shell at intervals in the length direction, the pair of first through holes are located between the pair of mounting holes, and a plurality of pole groups and a plurality of pairs of pole lugs in one-to-one correspondence with the pole groups are arranged in the shell; the pair of connecting pieces are arranged on the pole groups and on the inner side of the shell, one end of each connecting piece is provided with a protruding part, the protruding parts are connected with the pole columns, the protruding parts and the pole columns are arranged in the mounting holes in a one-to-one correspondence mode, and the other opposite ends of the connecting pieces extend to the first through holes in the length direction of the shell and are connected with the pole lugs. According to the utility model, one end of the connecting sheet is connected with the pole through the convex part, and the other end of the connecting sheet extends to the first through hole along the length direction of the shell and is connected with the tab, so that the pole, the connecting sheet and the tab are distributed along the length direction of the shell, the mounting thickness is reduced, and the space utilization rate of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack. Background Art

[0002] With the development of new energy technologies, battery packs are increasingly used in various new energy products. In a battery pack, a pole column is connected to an ear of a battery cell through a connecting piece to achieve electrical conduction.

[0003] However, both the connecting piece and the ear need to be bent, and the connecting piece, the pole column, and the ear are usually located on the same vertical plane, so a relatively large thickness space needs to be occupied, resulting in a low space utilization rate of the battery cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell and a battery pack to solve the problem that the connecting piece and the ear of the battery cell need to be bent and are arranged on the same vertical plane, occupying a relatively large thickness space and resulting in a low space utilization rate of the battery cell.

[0005] In a first aspect, the utility model provides a battery cell, comprising:

[0006] A housing, which is provided with a pair of mounting holes and a pair of first through holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, and a plurality of pole groups and a plurality of pairs of ears corresponding to the pole groups one by one are arranged inside the housing;

[0007] A pair of pole columns and a pair of connecting pieces, the pair of connecting pieces being arranged on the plurality of pole groups and on the inner side of the housing, one end of the connecting piece being provided with a convex portion, the top surface of the convex portion being connected to the bottom surface of the pole column, the convex portion and the pole column being arranged in the mounting holes one by one, and the opposite end of the connecting piece extending along the length direction of the housing to the first through hole and being connected to the ear.

[0008] Advantageous Effects: The housing of the utility model is provided with mounting holes and first through holes, and the first through holes leave an installation space for the connecting piece and the ear. One end of the connecting piece forms a convex portion to be connected to the pole column, and the convex portion and the pole column are installed in the mounting holes, so that the pole column and the connecting piece can be fixed simultaneously by using the mounting holes, saving the installation space and improving the space utilization rate. The other end of the connecting piece extends along the length direction of the housing to the first through hole and is connected to the ear, so that the pole column, the connecting piece, and the ear are distributed along the length direction of the housing, reducing the number of bends of the connecting piece, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell.

[0009] In an optional embodiment, the side of the connecting piece facing the pole column extends along the hole wall of the mounting hole to form the convex portion, and the convex portion is provided with a cavity.

[0010] Beneficial effects: The raised portion is formed by extending the connecting piece and extends along the hole wall of the mounting hole. The cooperation between the raised portion and the mounting hole can be used to achieve auxiliary positioning. The raised portion is provided with a cavity, which reduces the weight and is beneficial to the lightweight design.

[0011] In an optional embodiment, a first welding area is provided on the bottom surface of the raised portion, and the bottom surface of the pole column is penetratively welded to the top surface of the raised portion through the first welding area.

[0012] Beneficial effects: The bottom surface of the pole column is penetratively welded to the top surface of the raised portion through the first welding area, which can improve the structural strength of the pole column and the raised portion, reduce the welding difficulty, and improve the production efficiency of the battery cell.

[0013] In an optional embodiment, a second welding area is provided on the part where the connecting piece extends to the first through hole, and one end of the pole ear is bent and welded to the connecting piece through the second welding area.

[0014] Beneficial effects: After the pole ear is bent, it is directly welded to the connecting piece, which can reduce the number of welding and bending times of the connecting piece and the pole ear, thereby further improving the production efficiency of the battery cell.

[0015] In an optional embodiment, the pole column includes a pole column body and a riveting portion located at the upper end of the pole column body. The bottom surface of the pole column body is connected to the top surface of the raised portion. A limiting portion is provided at the lower end of the raised portion. A sealing ring is provided between the pole column body, the raised portion and the mounting hole. An installation space is formed by the riveting portion, the pole column body, the raised portion and the limiting portion;

[0016] The battery cell further includes a pair of insulating rubber rings and an insulating plate. The pair of insulating rubber rings are respectively sleeved outside the pair of pole column bodies. The insulating plate is arranged inside the housing. The insulating plate is provided with a second through hole, and the sealing ring passes through the second through hole;

[0017] The riveting portion and the limiting portion clamp the insulating rubber ring, the sealing ring and the peripheral wall of the second through hole at the installation space.

[0018] Beneficial effects: By using the riveting portion at the upper end of the pole column body and cooperating with the limiting portion at the lower end of the raised portion to clamp the insulating rubber ring, the sealing ring and the peripheral wall of the second through hole at the installation space, no other fixing and positioning structures are required, the housing structure of the battery cell is simplified, the installation and use are convenient, thereby improving the production efficiency of the battery cell and also improving the space utilization rate of the battery cell.

[0019] In an alternative embodiment, a first step is formed on the outer periphery of the upper end of the terminal body, and the first step serves as the riveting portion. A second step is formed on the outer periphery of the lower end of the protruding portion, and the second step serves as the limiting portion. The bottom surface of the riveting portion, the outer wall of the terminal body, the outer wall of the protruding portion, and the top surface of the limiting portion form an installation groove, and the installation groove serves as the installation space.

[0020] Advantageous effects: Before installing the insulating rubber ring, the sealing ring, and the insulating plate, the first step extends along the height direction of the terminal body. After installing the insulating rubber ring, the sealing ring, and the insulating plate, the first step is bent to extend along the outer periphery of the terminal body, so as to clamp the insulating rubber ring, the sealing ring, and the insulating plate between the first step and the second step, with firm connection, which can effectively ensure the structural strength and has a simple structure.

[0021] In an alternative embodiment, the insulating rubber ring is clamped between the riveting portion and the housing, and the sealing ring is clamped between the insulating rubber ring and the limiting portion.

[0022] Advantageous effects: The insulating rubber ring is located above the sealing ring and serves the functions of insulation and sealing. The sealing ring is clamped between the insulating rubber ring and the limiting portion, which can further improve the sealing effect.

[0023] In an alternative embodiment, the insulating plate is provided with a boss, and the boss is axially perforated to form the second through hole. The boss is clamped between the housing and the limiting portion.

[0024] Advantageous effects: The top of the boss of the insulating plate abuts against the housing, and the bottom of the boss abuts against the limiting portion. The use of the boss can achieve a positioning effect, improve the structural stability of the insulating plate, and does not occupy extra space.

[0025] In an alternative embodiment, the housing is further provided with a pair of sealing plates for respectively sealing a pair of the first through holes, and the housing is further provided with a liquid injection hole or an explosion-proof valve located between the pair of the first through holes.

[0026] Advantageous effects: The sealing plates are used to seal the first through holes, and the liquid injection hole is used to inject electrolyte. The explosion-proof valve opens when the internal pressure of the battery cell is greater than a preset pressure, so that the chamber inside the battery cell communicates with the outside through the explosion-proof valve, and the high-pressure gas is discharged to prevent the internal pressure of the battery cell from being too high and exploding.

[0027] In a second aspect, the present invention further provides a battery pack, including: a plurality of the above-mentioned battery cells.

[0028] Beneficial effects: Since the battery pack includes battery cells and has the same effects as the battery cells, that is, the housing is provided with a mounting hole and a first through hole, and the first through hole leaves an installation space for the connection piece and the tab. One end of the connection piece forms a convex portion to be connected to the pole column, and the convex portion and the pole column are installed in the mounting hole, so that the pole column and the connection piece can be fixed simultaneously by using the mounting hole, saving the installation space and improving the space utilization rate. The other end of the connection piece extends along the length direction of the housing to the first through hole and is connected to the tab, so that the pole column, the connection piece and the tab are distributed along the length direction of the housing, reducing the number of bends of the connection piece, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell. Description of the Drawings

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present invention;

[0031] Figure 2 Cross-sectional view of a battery cell according to an embodiment of the present invention;

[0032] Figure 3 For Figure 2 Enlarged view of part A in

[0033] Figure 4 Partial structural schematic diagram of the housing of a battery cell according to an embodiment of the present invention;

[0034] Figure 5 Partial structural schematic diagram of the tab of a battery cell before bending according to an embodiment of the present invention;

[0035] Figure 6 Partial structural schematic diagram of the tab of a battery cell after bending according to an embodiment of the present invention.

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Housing; 101. First through hole; 2. Electrode group; 3. Tab; 4. Pole column; 401. Pole column body; 402. Riveting part; 5. Connection piece; 501. Convex portion; 502. First welding area; 503. Second welding area; 504. Limiting part; 6. Sealing ring; 7. Insulating rubber ring; 8. Insulating plate; 801. Boss; 9. Sealing plate; 10. Liquid injection hole; 11. Explosion-proof valve. Detailed Embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 6 ...

[0040] According to an embodiment of the present utility model, on the one hand, as shown in Figure 1 and Figure 2 , a battery cell is provided, mainly including: a housing 1, a pair of pole columns 4, and a pair of connecting plates 5. The housing 1 is provided with a pair of mounting holes and a pair of first through holes 101 at intervals along the length direction. The pair of first through holes 101 are located between the pair of mounting holes. A plurality of pole groups 2 and a plurality of pairs of pole tabs 3 corresponding to the pole groups 2 one by one are provided inside the housing 1. A pair of connecting plates 5 are provided on the plurality of pole groups 2 and on the inner side of the housing 1. One end of the connecting plate 5 is provided with a convex portion 501, and the top surface of the convex portion 501 is connected to the bottom surface of the pole column 4. The convex portion 501 and the pole column 4 are provided in the mounting holes one by one. The other opposite end of the connecting plate 5 extends along the length direction of the housing 1 to the first through hole 101 and is connected to the pole tab 3.

[0041] For the battery cell provided by the embodiment of the present utility model, the housing 1 is provided with mounting holes and first through holes 101, and the first through holes 101 leave an installation space for the connecting plate 5 and the pole tab 3. One end of the connecting plate 5 forms a convex portion 501 to be connected to the pole column 4. The convex portion 501 and the pole column 4 are installed in the mounting holes, which can use the mounting holes to fix the pole column 4 and the connecting plate 5 at the same time, saving installation space and improving space utilization rate. The other end of the connecting plate 5 extends along the length direction of the housing 1 to the first through hole 101 and is connected to the pole tab 3, so that the pole column 4, the connecting plate 5, and the pole tab 3 are distributed along the length direction of the housing 1, reducing the number of bends of the connecting plate 5, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell.

[0042] Specifically, the length direction of the housing 1 is as shown by the arrow L in Figure 1 . As shown in Figure 5 and Figure 6 , side plates are provided around the housing 1, a bottom plate is provided at the bottom, and a top plate is provided at the top. The four side plates, the top plate, and the bottom plate are integrally formed and enclose a cavity. The top and bottom directions of the embodiment of the present utility model are as shown in Figure 3As shown in the figure. A pair of first through holes 101 and a pair of mounting holes are provided at intervals on the top plate. A plurality of pole groups 2 are stacked and arranged in the cavity. A plurality of pairs of pole tabs 3 are arranged on one side of the plurality of pole groups 2 close to the pole post 4. Each pole group 2 is correspondingly provided with a positive pole tab and a negative pole tab. Since the pole post 4 is arranged on the housing 1 and the pole tab 3 is installed at the first through hole 101, the pole tab 3 and the pole post 4 are arranged in a staggered manner, so that the installation thickness can be reduced and the space utilization rate can be improved.

[0043] A pair of pole posts 4 includes a positive pole post and a negative pole post. The connecting pieces 5 correspond to the pole posts 4 one by one. One of the connecting pieces 5 connects the positive pole post and the positive pole tabs of the plurality of pole groups 2, and the other connecting piece 5 connects the negative pole post and the negative pole tabs of the plurality of pole groups 2. The connecting piece 5 needs to be conductive to realize the electrical connection between the pole tab 3 and the pole post 4. A gap is left between the two connecting pieces 5 to prevent the positive pole post from being short-circuited with the negative pole post. The pole tab 3 is bent along the width direction of the housing 1 and then attached to the top surface of the connecting piece 5 to reduce the size of the first through hole 101 and improve the structural strength of the housing 1.

[0044] It should be noted that the number of pole groups 2 in the battery cell of the present utility model is not limited, and two, three or more than three can be selected. Exemplarily, as Figure 5 and Figure 6 shown, two pole groups 2 are provided, and each of the two pole groups 2 is provided with a positive pole tab and a negative pole tab. The two positive pole tabs are bent and welded to one connecting piece 5, and the two negative pole tabs are bent and welded to the other connecting piece 5.

[0045] In one embodiment, as Figure 3 shown, the side of the connecting piece 5 facing the pole post 4 extends along the hole wall of the mounting hole to form a convex portion 501, and the convex portion 501 is provided with a cavity. The convex portion 501 is formed by extending the connecting piece 5 and extends along the hole wall of the mounting hole, and the cooperation between the convex portion 501 and the mounting hole can be used to realize auxiliary positioning. The convex portion 501 is provided with a cavity, which reduces the weight and is beneficial to the lightweight design.

[0046] In one embodiment, as Figure 4 shown, the bottom surface of the convex portion 501 is provided with a first welding area 502, and the bottom surface of the pole post 4 is penetration-welded to the top surface of the convex portion 501 through the first welding area 502. The structural strength of the pole post 4 and the convex portion 501 can be improved, the welding difficulty can be reduced, and the production efficiency of the battery cell can be improved.

[0047] Specifically, both the convex portion 501 and the pole post 4 are columnar, and the top surface of the convex portion 501 and the bottom surface of the pole post 4 are both flat surfaces for welding. The first welding area 502 is a circular area.

[0048] In one embodiment, as Figure 6As shown, the portion of the connecting piece 5 extending to the first through hole 101 is provided with a second welding area 503. One end of the tab 3 is bent and welded to the connecting piece 5 through the second welding area 503. After the tab 3 is bent, it is directly welded to the connecting piece 5, which can reduce the number of welding and bending times of the connecting piece 5 and the tab 3, thereby further improving the production efficiency of the battery cell. The welding can be achieved by conventional welding processes such as laser welding or ultrasonic welding.

[0049] In one embodiment, as Figure 3 shown, the terminal post 4 includes a terminal post body 401 and a riveting portion 402 located at the upper end of the terminal post body 401. The bottom surface of the terminal post body 401 is connected to the top surface of the convex portion 501. A limiting portion 504 is provided at the lower end of the convex portion 501. A sealing ring 6 is provided between the terminal post body 401, the convex portion 501 and the mounting hole. The riveting portion 402, the terminal post body 401, the convex portion 501 and the limiting portion 504 enclose an installation space.

[0050] Furthermore, the battery cell further includes a pair of insulating rubber rings 7 and an insulating plate 8. The pair of insulating rubber rings 7 are respectively sleeved outside the pair of terminal post bodies 401. The insulating plate 8 is provided inside the housing 1. The insulating plate 8 is provided with a second through hole, and the sealing ring 6 is passed through the second through hole. The riveting portion 402 and the limiting portion 504 clamp the insulating rubber ring 7, the sealing ring 6 and the peripheral wall of the second through hole at the installation space.

[0051] By using the riveting portion 402 at the upper end of the terminal post body 401 and cooperating with the limiting portion 504 at the lower end of the convex portion 501 to clamp the insulating rubber ring 7, the sealing ring 6 and the peripheral wall of the second through hole at the installation space, no other fixing and positioning structures are required, which simplifies the structure of the housing 1 of the battery cell, facilitates installation and use, thereby improving the production efficiency of the battery cell and also improving the space utilization rate of the battery cell.

[0052] It should be noted that the embodiment of the present invention does not limit the material of the sealing ring 6. For example, the sealing ring 6 can be a rubber sealing ring, a silicone rubber sealing ring or other conventional sealing rings. In addition, the materials of the insulating rubber ring 7 and the insulating plate 8 are not limited either. For example, both the insulating rubber ring 7 and the insulating plate 8 can be plastic parts.

[0053] Furthermore, in one embodiment, a first step is formed on the outer periphery of the upper end of the terminal post body 401, and the first step serves as the riveting portion 402. A second step is formed on the outer periphery of the lower end of the convex portion 501, and the second step serves as the limiting portion 504. The bottom surface of the riveting portion 402, the outer wall of the terminal post body 401, the outer wall of the convex portion 501 and the top surface of the limiting portion 504 form an installation groove, and the installation groove serves as the installation space.

[0054] Before installing the insulating rubber ring 7, the sealing ring 6, and the insulating plate 8, the first step extends along the height direction of the pole column body 401. After installing the insulating rubber ring 7, the sealing ring 6, and the insulating plate 8, the first step is bent so that it extends along the outer circumference of the pole column body 401, thereby clamping the insulating rubber ring 7, the sealing ring 6, and the insulating plate 8 between the first step and the second step, with a firm connection, which can effectively ensure the structural strength and has a simple structure.

[0055] Further, in one embodiment, the insulating rubber ring 7 is clamped between the riveting portion 402 and the housing 1, playing the roles of insulation and sealing. The sealing ring 6 is clamped between the insulating rubber ring 7 and the limiting portion 504, which can further improve the sealing effect.

[0056] Further, in one embodiment, as Figure 3 shown, the insulating plate 8 is provided with a boss 801. The boss 801 is axially drilled to form a second through hole, and the boss 801 is clamped between the housing 1 and the limiting portion 504. The top of the boss 801 of the insulating plate 8 abuts against the housing 1, and the bottom of the boss 801 abuts against the limiting portion 504. The boss 801 can play a positioning effect, improving the structural stability of the insulating plate 8 without occupying extra space.

[0057] In one embodiment, as Figure 1 and Figure 2 shown, the housing 1 is further provided with a pair of sealing plates 9 for respectively sealing a pair of first through holes 101. The sealing plates 9 are used to seal the first through holes 101.

[0058] In one embodiment, as Figure 1 and Figure 2 shown, the housing 1 is further provided with a liquid injection hole 10 located between a pair of first through holes 101. The liquid injection hole 10 is used for injecting electrolyte.

[0059] In one embodiment, as Figure 5 and Figure 6 shown, the housing 1 is further provided with an explosion-proof valve 11 located between a pair of first through holes 101. The explosion-proof valve 11 opens when the internal pressure of the battery cell is greater than a preset pressure, so that the chamber inside the battery cell communicates with the outside through the explosion-proof valve 11 and discharges the high-pressure gas, to prevent the internal pressure of the battery cell from being too high and causing an explosion.

[0060] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, mainly including: a plurality of the above-mentioned battery cells.

[0061] Since the battery pack includes battery cells and has the same effect as the battery cells, that is, the housing 1 is provided with an installation hole and a first through hole 101, and the first through hole 101 leaves an installation space for the connection piece 5 and the pole ear 3. One end of the connection piece 5 forms a convex portion 501 to be connected to the pole column 4. The convex portion 501 and the pole column 4 are installed in the installation hole, and the pole column 4 and the connection piece 5 can be fixed simultaneously by using the installation hole, saving the installation space and improving the space utilization rate. The other end of the connection piece 5 extends along the length direction of the housing 1 to the first through hole 101 and is connected to the pole ear 3, so that the pole column 4, the connection piece 5 and the pole ear 3 are distributed along the length direction of the housing 1, reducing the number of bends of the connection piece 5, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell.

[0062] Specifically, multiple battery cells can be connected in series, in parallel, or in a combination of series and parallel. In this regard, the embodiments of the present invention do not impose any limitations.

[0063] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, which is provided with a pair of mounting holes and a pair of first through holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, and a plurality of electrode groups and a plurality of pairs of tab ears corresponding to the electrode groups one by one being arranged in the housing; A pair of electrode posts and a pair of connecting pieces, the pair of connecting pieces being arranged on the plurality of electrode groups and on the inner side of the housing, one end of the connecting piece being provided with a protruding portion, the top surface of the protruding portion being connected to the bottom surface of the electrode post, the protruding portion and the electrode post being arranged in the mounting holes one by one, and the opposite end of the connecting piece extending along the length direction of the housing to the first through hole and being connected to the tab ear.

2. The battery cell according to claim 1, wherein, One side of the connecting piece facing the electrode post extends along the hole wall of the mounting hole to form the protruding portion, and the protruding portion is provided with a cavity.

3. The battery cell according to claim 1, wherein The bottom surface of the protruding portion is provided with a first welding area, and the bottom surface of the electrode post is penetration-welded to the top surface of the protruding portion through the first welding area.

4. The battery cell according to claim 1, wherein The portion of the connecting piece extending to the first through hole is provided with a second welding area, and one end of the tab ear is bent and welded to the connecting piece through the second welding area.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The electrode post includes an electrode post body and a riveting portion located at the upper end of the electrode post body, the bottom surface of the electrode post body being connected to the top surface of the protruding portion, a limiting portion being provided at the lower end of the protruding portion, a sealing ring being provided between the electrode post body, the protruding portion and the mounting hole, and an installation space being formed by the riveting portion, the electrode post body, the protruding portion and the limiting portion; The battery cell further includes a pair of insulating rubber rings and an insulating plate, the pair of insulating rubber rings being respectively sleeved outside the pair of electrode post bodies, the insulating plate being arranged on the inner side of the housing, the insulating plate being provided with a second through hole, and the sealing ring being inserted through the second through hole; The riveting portion and the limiting portion clamp the insulating rubber ring, the sealing ring and the peripheral wall of the second through hole at the installation space.

6. The cell according to claim 5, wherein, A first step is formed on the outer periphery of the upper end of the electrode post body, the first step serving as the riveting portion, a second step is formed on the outer periphery of the lower end of the protruding portion, the second step serving as the limiting portion, and an installation groove is formed by the bottom surface of the riveting portion, the outer wall of the electrode post body, the outer wall of the protruding portion and the top surface of the limiting portion, the installation groove serving as the installation space.

7. The cell according to claim 5, wherein, The insulating rubber ring is clamped between the riveting portion and the housing, and the sealing ring is clamped between the insulating rubber ring and the limiting portion.

8. The battery cell according to claim 7, characterized in that, The insulating plate is provided with a boss, the boss is axially perforated to form the second through hole, and the boss is clamped between the housing and the limiting portion.

9. The battery cell according to any one of claims 1 to 4, characterized in that, The housing is further provided with a pair of sealing plates respectively sealing the pair of first through holes, and the housing is further provided with a liquid injection hole or an explosion-proof valve located between the pair of first through holes.

10. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 to 9.

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