Battery and battery pack with same

Abstract

The utility model relates to the technical field of battery manufacturing, and discloses a battery and a battery pack with the battery, the battery comprises a shell, a battery pack, a battery pack, a battery pack, a battery pack, a battery pack and a battery pack, the shell is provided with two openings, and the two openings are positioned on two opposite sides of the shell; the two cover plate assemblies comprise pole columns and cover plates, the cover plates are connected with the shell and seal the opening, the pole columns are connected with the cover plates, one of the two cover plates is a first cover plate, the other cover plate is a second cover plate, and the second cover plate is provided with an opening; the sealing plate is connected with the first cover plate and seals and covers the opening; one of the insulating plate and the sealing plate is provided with a boss, the other one of the insulating plate and the sealing plate is provided with a groove, and the boss is inserted into the groove; the pole group is arranged in the shell and comprises a first pole lug and a second pole lug, the first pole lug is connected with the pole column of the first cover plate, the second pole lug is connected with the pole column of the second cover plate through a connecting piece, and a part of the second pole lug is located between the connecting piece and the insulating plate. The second tab and the connecting piece of the battery are convenient to connect, and the space utilization rate can be improved.

Description

Technical Field

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

[0002] For the batteries in the related art, it is usually necessary to weld a connecting piece to a tab. The connecting piece and the tab are usually welded outside the battery case to avoid interference of the battery case with the welding. In some processing techniques, in order to facilitate welding, through holes are formed in the battery case to expose the connecting piece and the tab for welding, and then the through holes are covered with a sealing plate. Short circuit is likely to occur between the sealing plate and the tab. Content of the Utility Model

[0003] In view of this, the utility model provides a battery and a battery pack having the same to solve the problem that short circuit is likely to occur between the sealing plate and the tab.

[0004] In a first aspect, the utility model provides a battery, comprising: a case having two openings located on opposite sides of the case; two cover plate assemblies respectively disposed on opposite sides of the case, each cover plate assembly including a pole column and a cover plate, the cover plate being connected to the case and covering the opening, the pole column being connected to the cover plate, one of the two cover plates being a first cover plate and the other being a second cover plate, the second cover plate being provided with an open mouth; a sealing plate connected to the second cover plate and covering the open mouth; an insulating plate, one of the insulating plate and the sealing plate being provided with a boss and the other being provided with a groove, the boss being inserted into the groove; a pole group disposed in the case and including a first tab and a second tab, the first tab being connected to the pole column of the first cover plate, the second tab being connected to the pole column of the second cover plate through a connecting piece, and a part of the second tab being located between the connecting piece and the insulating plate.

[0005] Beneficial effects: By providing a sealing plate, the open end can be sealed, preventing the connecting piece, the second tab, and the electrode group from being exposed to the air, reducing the probability of contact between the connecting piece, the second tab, and the electrode group and the outside, ensuring the normal operation of the battery, and reducing the probability of battery damage. By providing an insulating plate, both the second tab and the connecting piece can be isolated from the sealing plate, thereby preventing the sealing plate from being charged and causing battery leakage, ensuring the insulation performance between the second tab and the sealing plate, and improving the reliability of the battery. In addition, the insulating plate and the sealing plate are provided with a groove and a boss in cooperation, increasing the contact surface between the sealing plate and the insulating plate, improving the binding force of the sealing plate on the insulating plate, fully ensuring the connection strength between the sealing plate and the insulating plate, and improving the sealing performance. Since a part of the second tab is located between the insulating plate and the connecting piece, the second tab only needs to be bent once, which can reduce the bending process of the second tab, reduce the processing difficulty, reduce the required layout space of the second tab, and improve the space utilization rate inside the battery.

[0006] In an alternative embodiment, the boss includes: a base; an inverted buckle portion, the inverted buckle portion is connected to the top end of the base, the central axis of the base coincides with the central axis of the inverted buckle portion, the radius of the inverted buckle portion is greater than the radius of the inverted buckle portion, and the difference between the radius of the inverted buckle portion and the radius of the top end of the base is R, where R ≥ 0.5 mm.

[0007] Beneficial effects: The large mating area between the inverted buckle portion and the groove is conducive to improving the assembly strength between the sealing plate and the insulating plate and reducing the probability of separation between the sealing plate and the insulating plate.

[0008] In an alternative embodiment, the diameter W of the bottom end of the base is 0.35 mm to 1.2 mm.

[0009] Beneficial effects: The large area of the base can improve the structural strength of the root of the base, ensure the strength of the boss during the assembly and disassembly of the sealing plate and the insulating plate, and reduce the probability of the boss breaking.

[0010] In an alternative embodiment, an annular rib is provided on the inner wall of the groove, and the annular rib is inserted into the inverted buckle portion on the side of the inverted buckle portion facing the base, and the height t1 of the annular rib is 0.25 mm to 0.55 mm.

[0011] Beneficial effects: The annular rib has sufficient structural strength and is not easily deformed, which can ensure the connection reliability between the sealing plate and the insulating plate, and the thickness of the insulating plate and the sealing plate can be reduced, saving space and improving space utilization rate. It can also prevent the height of the base from being too large and reduce the probability of the base bending.

[0012] In an alternative embodiment, the height t2 of the inverted buckle portion is 0.25 mm to 0.55 mm.

[0013] Beneficial effects: The inverted part has sufficient structural strength and is not prone to deformation, which can ensure the connection reliability between the sealing plate and the insulating plate. Moreover, the thicknesses of the insulating plate and the sealing plate can be reduced, saving space and improving space utilization rate. It can also prevent the base from being too high and reduce the probability of the base bending.

[0014] In an alternative embodiment, the diameter of the base gradually increases in the direction approaching the inverted part.

[0015] Beneficial effects: The connection area between the base and the inverted part is large, which is beneficial to improving the structural strength of the boss and reducing the probability of damage to the boss. And the contact area between the base and the annular rib is large, which is beneficial to improving the connection strength between the sealing plate and the insulating plate and ensuring the relative position stability between the sealing plate and the insulating plate.

[0016] In an alternative embodiment, the first cover plate is provided with a liquid injection hole and / or an explosion-proof valve.

[0017] Beneficial effects: It will not affect the layout on the second cover plate, facilitating the setting of the open mouth. And the connection between the second tab and the connecting piece is convenient, and the connection between the sealing plate and the second cover plate is also relatively convenient.

[0018] In an alternative embodiment, there are multiple bosses, and the multiple bosses are arranged at intervals along the length direction of the sealing plate; there are multiple grooves, and the multiple grooves are arranged at intervals along the length direction of the insulating plate, and the multiple bosses and the multiple grooves are connected in a one-to-one correspondence.

[0019] Beneficial effects: By setting multiple bosses and multiple grooves to cooperate, the sealing plate and the insulating plate are connected at multiple points, which can improve the connection strength between the sealing plate and the insulating plate and ensure the relative position reliability between the sealing plate and the insulating plate.

[0020] In an alternative embodiment, the thickness T of the sealing plate is 1.2 mm to 1.8 mm.

[0021] Beneficial effects: The sealing plate has relatively high structural strength and is not easily damaged. Moreover, the thickness of the sealing plate is relatively thin, occupying less space in the housing, saving internal space and improving space utilization rate.

[0022] In the second aspect, the present invention also provides a battery pack, including the battery described in the first aspect embodiment.

[0023] Beneficial effects: The battery pack has the advantages of high space utilization rate and convenient processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Partial structural schematic diagram of the battery according to an embodiment of the present utility model;

[0026] Figure 2 Partial cross-sectional view of the battery according to an embodiment of the present utility model;

[0027] Figure 3 Schematic diagram of the cooperation between the sealing plate and the insulating plate of the battery according to an embodiment of the present utility model;

[0028] Figure 4 Cross-sectional view of the sealing plate and the insulating plate of the battery according to an embodiment of the present utility model;

[0029] Figure 5 Structural schematic diagram of the sealing plate of the battery according to an embodiment of the present utility model;

[0030] Figure 6 Cross-sectional view of the sealing plate of the battery according to an embodiment of the present utility model;

[0031] Figure 7 Structural schematic diagram of the insulating plate of the battery according to an embodiment of the present utility model;

[0032] Figure 8 Cross-sectional view of the insulating plate of the battery according to an embodiment of the present utility model;

[0033] Figure 9 Schematic diagram of the cooperation between the housing, the second cover assembly and the second tab of the battery according to an embodiment of the present utility model;

[0034] Figure 10 Schematic diagram of the cooperation between the housing and the second cover of the battery according to an embodiment of the present utility model;

[0035] Figure 11 Cross-sectional view of the second cover assembly of the battery according to an embodiment of the present utility model;

[0036] Figure 12 Structural schematic diagram of the first cover assembly of the battery according to an embodiment of the present utility model

[0037] Explanation of reference numerals:

[0038] 1. Battery; 100. Shell; 200. Electrode group; 220. Second pole ear; 310. Pole; 320. Connecting piece; 400. Sealing plate; 410. Groove; 411. Annular rib; 500. Insulating plate; 510. Boss; 511. Base; 512. Undercut; 600. First cover plate; 610. Explosion-proof valve; 620. Liquid injection hole; 700. Second cover plate; 710. Open mouth. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, the meaning of "plurality" is two or more. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Combine the following Figures 1 to 12 , describing an embodiment of the utility model.

[0044] According to an embodiment of the present utility model, on the one hand, a battery 1 is provided. The battery 1 includes a housing 100, a pole group 200, a cover plate assembly, a sealing plate 400, and an insulating plate 500.

[0045] The housing 100 has two openings, and the two openings are located on opposite sides of the housing 100, that is, one of the opposite sides of the housing 100 is provided with one opening, and the other of the opposite sides of the housing 100 is provided with another opening.

[0046] The pole group 200 is disposed in the housing 100 and includes a first pole tab and a second pole tab 220. The pole group 200 may further include a pole group body. Both the first pole tab and the second pole tab 220 are connected to the pole group body, and the first pole tab and the second pole tab 220 are located on opposite sides of the pole group body.

[0047] Two cover plate assemblies are respectively disposed on opposite sides of the housing 100. The cover plate assembly includes a pole column 310 and a cover plate. The cover plate is connected to the housing 100 and seals the opening. The pole column 310 is connected to the cover plate. One of the two cover plates is a first cover plate 600 and the other is a second cover plate 700. The second cover plate 700 is provided with an open mouth 710.

[0048] The sealing plate 400 is connected to the second cover plate 700 and seals the open mouth 710. One of the insulating plate 500 and the sealing plate 400 is provided with a boss 510 and the other is provided with a groove 410. The boss 510 is inserted into the groove 410. The pole column 310 of the first cover plate 600 is connected to the first pole tab. The pole column 310 of the second cover plate 700 is connected to the second pole tab 220 through a connecting piece 320. The second pole tab 220 is located between the insulating plate 500 and the connecting piece 320.

[0049] For example, the groove 410 may be in the shape of a circle, a square, an ellipse, a polygon, a racetrack shape, etc. The shape of the boss 510 may be adapted to the shape of the groove 410. The sealing plate 400 and the insulating plate 500 may be injection-molded and connected.

[0050] The following describes the process of manufacturing the battery 1 by way of example:

[0051] First, connect the pole column 310 of the first cover plate 600 and the first pole tab, insert the pole group 200 into the housing 100 through one opening, and connect the first cover plate 600 to the housing 100 so that the first cover plate 600 seals the opening. Among them, the first cover plate 600 and the housing 100 may be welded;

[0052] Then, connect the second cover plate 700 to the housing 100 so that the second cover plate 700 seals the other opening, and the second pole tab 220 is exposed from the open mouth 710. Among them, the second cover plate 700 and the housing 100 may be welded;

[0053] Next, bend the second tab 220 above the connecting piece 320 and weld the second tab 220 and the connecting piece 320. For example, the connecting piece 320 and the second tab 220 can be welded by welding processes such as laser welding or ultrasonic welding;

[0054] Finally, insert the boss 510 into the groove 410 to fix the relative positions of the sealing plate 400 and the insulating part, and connect the sealing plate 400 with the second cover plate 700 so that the sealing plate 400 seals the open opening 710, where the sealing plate 400 and the second cover plate 700 can be welded.

[0055] By providing the open opening 710, it is convenient for welding between the connecting piece 320 and the second tab 220, and reduces the bending process of the second tab 220, improving the production efficiency.

[0056] By providing the sealing plate 400, the open opening 710 can be sealed, preventing the connecting piece 320, the second tab 220, and the electrode group 200 from being exposed to the air, reducing the probability of contact between the connecting piece 320, the second tab 220, and the electrode group 200 and the outside, ensuring the normal operation of the battery 1, and reducing the probability of damage to the battery 1. Among them, the sealing plate 400 can be made of a metal material, and the connection between the sealing plate 400 and the second cover plate 700 can be welding, with high connection strength and good sealing performance between the sealing plate 400 and the second cover plate 700. The insulating plate 500 can be made of a heat-melting material such as insulating plastic.

[0057] By providing the insulating plate 500, both the second tab 220 and the connecting piece 320 can be isolated from the sealing plate 400, thus preventing the sealing plate 400 from being charged and causing the battery 1 to leak electricity, ensuring the insulation performance between the second tab 220 and the sealing plate 400, and improving the reliability of the battery 1. In addition, the insulating plate 500 and the sealing plate 400 are arranged in cooperation with the groove 410 and the boss 510, increasing the contact surface between the sealing plate 400 and the insulating plate 500, improving the binding force of the sealing plate 400 on the insulating plate 500, fully ensuring the connection strength between the sealing plate 400 and the insulating plate 500, improving the sealing performance, and since the second tab 220 is located between the insulating plate 500 and the connecting piece 320, the second tab 220 only needs to be bent once, reducing the bending process of the second tab 220, lowering the processing difficulty, and also reducing the required layout space for the second tab 220, improving the space utilization rate inside the battery 1.

[0058] In addition, the first cover plate 600 and the second cover plate 700 can be respectively arranged on opposite sides in the length direction of the housing 100, and the two pole columns 310 are respectively arranged on opposite sides of the housing 100, which can reduce the thickness and width of the battery 1 and facilitate expanding the application range of the battery 1.

[0059] Such as Figure 8As shown, in the technical solution of this embodiment, the boss 510 includes a base 511 and an undercut portion 512. The undercut portion 512 is connected to the top end of the base 511. The central axis of the base 511 coincides with the central axis of the undercut portion 512. The radius of the undercut portion 512 is greater than the radius of the base 511. The difference between the radius of the undercut portion 512 and the radius of the top end of the base 511 is R, and R≥0.5mm. That is to say, the radius of the undercut portion 512 is greater than the radius of the top end of the base 511, and the difference between the two radii is not less than 0.5mm. Among them, R can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0060] In this way, the mating area between the undercut portion 512 and the groove 410 is large, which is beneficial to improving the assembly strength between the sealing plate 400 and the insulating plate 500 and reducing the separation probability of the sealing plate 400 and the insulating plate 500.

[0061] As Figure 8 shown, in the technical solution of this embodiment, the diameter W of the bottom end of the base 511 is 0.35mm to 1.2mm. Among them, the diameter W of the bottom end of the base 511 can be 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm or 1.2mm. In this way, the area of the base 511 is relatively large, which can improve the structural strength of the bottom of the base 511, ensure the strength of the boss 510 during the assembly and disassembly of the sealing plate 400 and the insulating plate 500, and reduce the breakage probability of the boss 510.

[0062] As Figure 4 and Figure 6 shown, in the technical solution of this embodiment, an annular rib 411 is provided on the inner wall of the groove 410. The annular rib 411 is inserted on the side of the undercut portion 512 facing the base 511. The height t1 of the annular rib 411 is 0.25mm to 0.55mm. The height t1 of the annular rib 411 can be 0.25mm, 0.3mm, 0.45mm, 0.5mm or 0.55mm.

[0063] If the height t1 of the annular rib 411 is less than 0.25mm, the strength of the annular rib 411 is too low and it is easy to deform, resulting in easy separation of the sealing plate 400 and the insulating plate 500 and poor connection reliability; if the height t1 of the annular rib 411 is greater than 0.55mm, it is easy to cause the height of the base 511 to be too large, and the base 511 is easy to bend, affecting the structural stability of the boss 510, and may cause an increase in the thickness of the insulating plate 500 and the thickness of the sealing plate 400, excessively occupying the space inside the housing 100.

[0064] By setting t1 to 0.25mm~0.55mm, the structural strength of the annular rib 411 is sufficient and not prone to deformation, which can ensure the connection reliability of the sealing plate 400 and the insulating plate 500, and the thickness of the insulating plate 500 and the sealing plate 400 can be reduced, saving space and improving space utilization. It can also avoid the height of the base 511 being too large and reduce the probability of the base 511 bending.

[0065] like Figure 8 As shown, in the technical solution of this embodiment, the height t2 of the undercut portion 512 is 0.25 mm to 0.55 mm, and the height t2 of the undercut portion 512 can be 0.25 mm, 0.3 mm, 0.45 mm, 0.5 mm or 0.55 mm.

[0066] If the height t2 of the undercut portion 512 is less than 0.25 mm, the strength of the undercut portion 512 is too low and it is easy to deform, causing the sealing plate 400 and the insulating plate 500 to be easily separated and the connection reliability to be poor; if the height t2 of the undercut portion 512 is greater than 0.55 mm, it may cause the thickness of the insulating plate 500 and the sealing plate 400 to increase, thereby excessively occupying the space inside the shell 100.

[0067] By setting t2 to 0.25mm~0.55mm, the structural strength of the undercut portion 512 is sufficient and not prone to deformation, which can ensure the connection reliability between the sealing plate 400 and the insulating plate 500, and the thickness of the insulating plate 500 and the sealing plate 400 can be reduced, saving space and improving space utilization. It can also avoid the height of the base 511 being too large and reduce the probability of the base 511 bending.

[0068] like Figure 4 and Figure 8 As shown, in the technical solution of this embodiment, the diameter of the base 511 gradually increases from low to high, that is, the diameter of the base 511 gradually increases toward the undercut portion 512. The shape of the annular rib 411 is adapted to the shape of the base 511.

[0069] In this way, the connection area between the base 511 and the undercut portion 512 is large, which is beneficial to improving the structural strength of the boss 510 and reducing the probability of damage to the boss 510. In addition, the contact area between the base 511 and the annular rib 411 is large, which is beneficial to improving the connection strength between the sealing plate 400 and the insulating plate 500 and ensuring the relative position stability between the sealing plate 400 and the insulating plate 500.

[0070] like Figure 6As shown, in the technical solution of this embodiment, the thickness T of the sealing plate 400 is 1.2 mm to 1.8 mm. If T is less than 1.2 mm, the thickness of the sealing plate 400 is too thin, the structural strength is low, and the sealing plate 400 is easily damaged. If T is greater than 1.8 mm, the thickness of the sealing plate 400 is too thick, occupying too much internal space of the housing 100 and affecting the arrangement of the electrode group 200. By setting T to be 1.2 mm to 1.8 mm, the sealing plate 400 has a relatively high structural strength and is not easily damaged, and the thickness of the sealing plate 400 is relatively thin, occupying less space of the housing 100, saving internal space and improving space utilization rate.

[0071] As Figure 12 shown, in the technical solution of this embodiment, the first cover plate 600 is provided with a liquid injection hole 620. In this way, liquid injection into the battery 1 can be realized, and since the liquid injection hole 620 is provided on the first cover plate 600, it will not affect the arrangement on the second cover plate 700, facilitating the setting of the open mouth 710, and the connection between the second pole ear 220 and the connecting piece 320 is convenient, and the connection between the sealing plate 400 and the second cover plate 700 is also relatively convenient.

[0072] As Figure 12 shown, in the technical solution of this embodiment, the first cover plate 600 is provided with an explosion-proof valve 610. In this way, the explosion of the battery 1 can be avoided, and since the explosion-proof valve 610 is provided on the first cover plate 600, it will not affect the arrangement on the second cover plate 700, facilitating the setting of the open mouth 710, and the connection between the second pole ear 220 and the connecting piece 320 is convenient, and the connection between the sealing plate 400 and the second cover plate 700 is also relatively convenient.

[0073] In addition, the liquid injection hole 620 and the explosion-proof valve 610 can both be provided on the first cover plate 600, and the liquid injection hole 620, the explosion-proof valve 610 and the terminal post 310 can be arranged along the length direction of the first cover plate 600.

[0074] As Figures 4 to 8 shown, in the technical solution of this embodiment, there are multiple bosses 510, and the multiple bosses 510 are arranged at intervals along the length direction of the sealing plate 400. There are multiple grooves 410, and the multiple grooves 410 are arranged at intervals along the length direction of the insulating plate 500, and the multiple bosses 510 and the multiple grooves 410 are connected in one-to-one correspondence.

[0075] By setting a plurality of bosses 510 to cooperate with a plurality of grooves 410, there are multiple-point connections between the sealing plate 400 and the insulating plate 500, which can improve the connection strength between the sealing plate 400 and the insulating plate 500 and ensure the relative position reliability between the sealing plate 400 and the insulating plate 500. In addition, since the width of the battery 1 is reduced, the widths of the sealing plate 400 and the insulating plate 500 are also reduced accordingly. By arranging the plurality of bosses 510 at intervals along the length direction of the sealing plate 400 and arranging the plurality of grooves 410 at intervals along the length direction of the insulating plate 500, the number of grooves 410 and the number of bosses 510 can be increased, and further improve the connection strength between the sealing plate 400 and the insulating plate 500.

[0076] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including the battery 1 of the above embodiment. The battery pack of the embodiment of the present invention has the advantages of good insulation, convenient processing, and high space utilization rate by using the battery 1.

[0077] 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, characterized in that: include: A shell, wherein the shell has two openings, and the two openings are located on opposite sides of the shell; Two cover plate assemblies, the two cover plate assemblies are arranged on opposite sides of the shell, the cover plate assembly includes a pole and a cover plate, the cover plate is connected to the shell and covers the opening, the pole is connected to the cover plate, one of the two cover plates is a first cover plate and the other is a second cover plate, and the second cover plate is provided with an opening; a sealing plate connected to the second cover plate and covering the open opening; An insulating plate, wherein one of the insulating plate and the sealing plate is provided with a boss and the other is provided with a groove, and the boss is inserted into the groove; A pole group is arranged in the shell and includes a first pole ear and a second pole ear, the first pole ear is connected to the pole of the first cover plate, the second pole ear is connected to the pole of the second cover plate through a connecting piece, and a part of the second pole ear is located between the connecting piece and the insulating plate.

2. The battery according to claim 1, characterized in that The boss comprises: Base; An undercut portion, wherein the undercut portion is connected to the top of the base, the central axis of the base coincides with the central axis of the undercut portion, the radius of the undercut portion is greater than the radius of the undercut portion, and the difference between the radius of the undercut portion and the radius of the top of the base is R, and R≥0.5mm.

3. The battery according to claim 2, characterized in that The diameter W of the bottom end of the base is 0.35 mm to 1.2 mm.

4. The battery according to claim 2, characterized in that An annular rib is provided on the inner wall of the groove, and the annular rib is located on the side of the undercut portion facing the base, and the height t1 of the annular rib is 0.25 mm to 0.55 mm.

5. The battery according to claim 2, characterized in that The height t2 of the undercut portion is 0.25 mm to 0.55 mm.

6. The battery according to claim 2, characterized in that The diameter of the base gradually increases toward the direction approaching the undercut portion.

7. The battery according to any one of claims 1 to 6, characterized in that The first cover plate is provided with a liquid injection hole and / or an explosion-proof valve.

8. The battery according to any one of claims 1 to 6, characterized in that There are multiple bosses, and the multiple bosses are arranged at intervals along the length direction of the sealing plate; There are a plurality of grooves, and the plurality of grooves are arranged at intervals along the length direction of the insulating plate, and the plurality of bosses and the plurality of grooves are connected in a one-to-one correspondence.

9. The battery according to any one of claims 1 to 6, characterized in that The thickness T of the sealing plate is 1.2 mm to 1.8 mm.

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

Images