Battery cover plate, battery and battery pack

Abstract

The utility model relates to the technical field of battery manufacturing, and discloses a battery cover plate, a battery and a battery pack, the battery cover plate comprises a cover plate provided with at least two openings; each sealing assembly comprises a sealing plate and an insulating plate, the sealing plate is connected with the cover plate, each sealing plate covers one 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; each pole assembly comprises a pole and a connecting piece, the pole is arranged on the cover plate, the connecting piece is connected to the pole, the connecting piece is located on the side, opposite to the sealing plate, of the insulating plate, and a tab space is defined between the connecting piece and the insulating plate. The battery cover plate disclosed by the utility model is high in space utilization rate, convenient in connection of the tabs and the connecting sheets, and good in insulating property.

Description

Technical Field

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

[0002] Batteries in related technologies usually need to weld the connecting piece to the tab, and the connecting piece and the tab are usually welded outside the battery shell to avoid interference of the battery shell on the welding. In some processing technologies, in order to facilitate welding, a through hole is opened on the battery shell to expose the connecting piece and the tab, and then welded, and then the through hole is covered by a sealing plate, which is easy to short-circuit between the sealing plate and the tab. Utility Model Content

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

[0004] In the first aspect, the utility model provides a battery cover, comprising: a cover, the cover is provided with at least two openings; at least two sealing assemblies, each of the sealing assemblies comprises a sealing plate and an insulating plate, the sealing plate is connected to the cover, each of the sealing plates covers one of the openings, one of the insulating plate and the sealing plate is provided with a boss and the other is provided with a groove, the boss is inserted into the groove; two pole assemblies, each of the pole assemblies comprises a pole and a connecting piece, the pole is provided on the cover, the connecting piece is connected to the pole, the connecting piece is located on the side of the insulating plate facing away from the sealing plate, and a pole ear space is defined between the connecting piece and the insulating plate.

[0005] Beneficial effects: By setting a sealing plate, the open mouth can be sealed to prevent the connecting piece, the pole ear and the pole group from being exposed to the air, reduce the probability of the connecting piece, the pole ear and the pole group contacting the outside world, ensure the normal operation of the battery, and reduce the probability of battery damage. By setting an insulating plate, the pole ear and the connecting piece can be isolated from the sealing plate, thereby preventing the sealing plate from being charged and causing battery leakage, and preventing the sealing plate from being connected to the two pole ears and causing a short circuit in the battery, ensuring that the battery can be used normally, and ensuring the insulation performance of the pole ear and the sealing plate, thereby improving the reliability of the battery. In addition, the insulating plate and the sealing plate are arranged in combination with grooves and bosses, which increases the contact surface between the sealing plate and the insulating plate, improves the restraining force of the sealing plate on the insulating plate, fully ensures the connection strength between the sealing plate and the insulating plate, and improves the sealing performance.

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

[0007] Advantageous effects: The mating area between the undercut portion and the groove is large, which is beneficial to improving the assembly strength between the sealing plate and the insulating plate and reducing the separation probability between the sealing plate and the insulating plate.

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

[0009] Advantageous effects: The area of the base is relatively large, which can improve the structural strength of the bottom 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 breakage probability of the boss.

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

[0011] Advantageous effects: The annular rib 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 height of the base from being too large and reduce the bending probability of the base.

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

[0013] Advantageous effects: The undercut portion 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 height of the base from being too large and reduce the bending probability of the base.

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

[0015] Advantageous effects: The connection area between the base and the undercut portion is large, which is beneficial to improving the structural strength of the boss and reducing the damage probability of the boss. Also, 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 cover plate is provided with a liquid injection hole, the liquid injection hole is located between the two open openings, each open opening is provided between the two pole posts, the distance H1 between the sealing plate and the liquid injection hole is ≥ 2 mm, and the distance H2 between the sealing plate and the pole post is ≥ 2 mm.

[0017] Advantageous effects: There is sufficient clearance between the sealing plate and the pole post, which avoids affecting the pole post when the sealing plate is welded to the cover plate, ensures the cleanliness of the outer surface of the pole post, enables the battery to be filled with liquid normally, and is beneficial to improving the yield rate of the battery. And there is sufficient clearance between the sealing plate and the liquid injection hole, which avoids affecting the liquid injection hole when the sealing plate is welded to the cover plate, ensures the effective smoothness of the liquid injection hole, enables the battery to be filled with liquid normally, and is beneficial to improving the yield rate of the battery.

[0018] In an alternative embodiment, there are a plurality of the bosses, the arrangement direction of the plurality of bosses is perpendicular to the arrangement direction of the two sealing plates; there are a plurality of the grooves, the arrangement direction of the plurality of grooves is perpendicular to the arrangement direction of the two sealing plates, and the plurality of bosses and the plurality of grooves are connected in a one-to-one correspondence.

[0019] Advantageous effects: By providing a plurality of bosses and a plurality of grooves in cooperation, there are multiple-point connections between the sealing plate and the insulating plate, 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. In addition, the arrangement direction of the two sealing plates can be the width direction of the battery, and the arrangement direction of the plurality of bosses can be the thickness direction of the battery. Since the pole post, the sealing plate and the liquid injection hole are arranged along the width direction of the battery, the size of the sealing plate in the width direction of the battery is small. By arranging the plurality of bosses along the thickness direction of the battery, the number of the bosses can be increased, so that the connection strength between the insulating plate and the sealing plate is greater.

[0020] In a second aspect, the present invention further provides a battery, including: a housing, the housing is provided with a disassembly and assembly opening; the battery cover plate of the first embodiment, the cover plate is connected to the housing and seals the disassembly and assembly opening, and the cover plate and the housing enclose a receiving space; a pole group, the pole group is arranged in the receiving space and includes pole tabs, the pole tabs are located in the pole tab space and are connected to the connecting piece.

[0021] Advantageous effects: The battery is convenient to process and has good insulation performance.

[0022] In a third aspect, the present invention further provides a battery pack, including the battery of the first embodiment.

[0023] Advantageous effects: The battery pack is convenient to process and has good insulation performance. Description of the Drawings

[0024] 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 also be obtained based on these drawings.

[0025] Figure 1 One of the schematic structural diagrams of the battery according to an embodiment of the present invention;

[0026] Figure 2 Another schematic structural diagram of the battery according to an embodiment of the present invention;

[0027] Figure 3 It is Figure 2 The cross-sectional view along the A-A line in

[0028] Figure 4 The schematic diagram of the cooperation of the housing, cover plate and pole column assembly of the battery according to an embodiment of the present invention;

[0029] Figure 5 The schematic diagram of the cooperation of the housing and cover plate of the battery according to an embodiment of the present invention;

[0030] Figure 6 The schematic diagram of the cooperation of the sealing plate and insulating plate of the battery according to an embodiment of the present invention;

[0031] Figure 7 The cross-sectional view of the sealing plate and insulating plate of the battery according to an embodiment of the present invention;

[0032] Figure 8 The schematic structural diagram of the sealing plate of the battery according to an embodiment of the present invention;

[0033] Figure 9 The cross-sectional view of the sealing plate of the battery according to an embodiment of the present invention;

[0034] Figure 10 The schematic structural diagram of the insulating plate of the battery according to an embodiment of the present invention;

[0035] Figure 11 The cross-sectional view of the insulating plate of the battery according to an embodiment of the present invention;

[0036] Figure 12 One of the schematic structural diagrams of the electrode group of the battery according to an embodiment of the present invention;

[0037] Figure 13 Another schematic structural diagram of the electrode group of the battery according to an embodiment of the present invention.

[0038] Explanation of reference numerals:

[0039] 1. Battery; 100. Shell; 200. Electrode group; 300. Electrode column assembly; 310. Electrode column; 320. Connecting piece; 330. Electrode ear; 400. Sealing plate; 410. Groove; 411. Annular rib; 500. Insulating plate; 510. Boss; 511. Base; 512. Undercut; 600. Cover plate; 610. Open mouth; 620. Liquid injection hole. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Combine the following Figures 1 to 13 , describing an embodiment of the utility model.

[0045] According to an embodiment of the present utility model, on the one hand, a battery cover plate is provided. The battery cover plate includes a cover plate 600, at least two pole column assemblies 300, and at least two sealing assemblies.

[0046] The cover plate 600 is provided with at least two open openings 610. Each sealing assembly includes a sealing plate 400 and an insulating plate 500. The sealing plate 400 is connected to the cover plate 600. Each sealing plate 400 seals an open opening 610, that is, at least two sealing plates 400 and at least two open openings 610 are arranged in one-to-one correspondence, and each sealing plate 400 seals the open opening 610 corresponding to it.

[0047] 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. Each pole column assembly 300 includes a pole column 310 and a connecting piece 320. The pole column 310 is arranged on the cover plate 600. The connecting piece 320 is connected to the pole column 310. The connecting piece 320 is located on the side of the insulating plate 500 facing away from the sealing plate 400. A tab space is defined between the connecting piece 320 and the insulating plate 500.

[0048] For example, the groove 410 can be in the shape of a circle, square, ellipse, polygon, racetrack, etc. The shape of the boss 510 can be adapted to the shape of the groove 410. The sealing plate 400 and the insulating plate 500 can be injection-molded and connected.

[0049] During the processing of the battery 1, the pole column 310 is installed on the cover plate 600, and then the pole column 310 and the connecting piece 320 are welded and connected. Then, the connecting piece 320 and the tab 330 can be welded together through the open opening 610. For example, the connecting piece 320 and the tab 330 can be welded by welding processes such as laser welding or ultrasonic welding, reducing the welding process of the connecting piece 320 and the tab 330. And since the tab 330 is located in the tab space, that is, the tab 330 is located between the connecting piece 320 and the insulating plate 500, the bending process of the tab 330 can be reduced, improving the production efficiency.

[0050] By providing the sealing plate 400, the open opening 610 can be sealed, preventing the connecting piece 320, the tab 330, and the electrode group 200 from being exposed to the air, reducing the probability of contact between the connecting piece 320, the tab 330, and the electrode group 200 and the outside, ensuring the normal operation of the battery 1, and reducing the damage probability of the battery 1. Among them, the sealing plate 400 can be made of a metal material. The sealing plate 400 and the cover plate 600 can be welded, and the connection strength between the sealing plate 400 and the cover plate 600 is high and the sealing performance is good. The insulating plate 500 can be made of a heat-melt material such as insulating plastic.

[0051] By providing the insulating plate 500, both the tab 330 and the connecting piece 320 can be isolated from the sealing plate 400, thereby preventing the sealing plate 400 from being charged and causing the battery 1 to leak electricity, and preventing the sealing plate 400 from being connected to the two tabs 330 and causing the battery 1 to short-circuit, ensuring that the battery 1 can be used normally, ensuring the insulation performance between the tab 330 and the sealing plate 400, and improving the reliability of the battery 1.

[0052] 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 tab 330 is located in the tab space, that is, the tab 330 is located between the insulating plate 500 and the connecting piece 320, the tab 330 only needs to be bent once, which can reduce the bending of the tab 330, reduce the processing difficulty, and improve the space utilization rate inside the battery 1.

[0053] As Figure 7 and Figure 11 shown, in the technical solution of this embodiment, the boss 510 includes a base 511 and an inverted buckle portion 512. The inverted buckle portion 512 is connected to the top end of the base 511. The central axes of the base 511 and the inverted buckle portion 512 coincide. The radius of the inverted buckle portion 512 is greater than the radius of the base 511. The difference between the radius of the inverted buckle 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 inverted buckle 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.

[0054] In this way, the mating area between the inverted buckle 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 between the sealing plate 400 and the insulating plate 500.

[0055] As Figure 3 and Figure 5 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.

[0056] In this way, the base 511 has a larger area, 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 probability of the boss 510 breaking.

[0057] like Figure 7 and Figure 9 As shown, in the technical solution of this embodiment, the inner wall of the groove 410 is provided with an annular rib 411, and 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~0.55mm, and the height t1 of the annular rib 411 can be 0.25mm, 0.3mm, 0.45mm, 0.5mm or 0.55mm.

[0058] If the height t1 of the annular rib 411 is less than 0.25 mm, the strength of the annular rib 411 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 t1 of the annular rib 411 is greater than 0.55 mm, 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 the thickness of the insulating plate 500 and the sealing plate 400 to increase, excessively occupying the space in the shell 100.

[0059] 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.

[0060] like Figure 11 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.

[0061] 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.

[0062] 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.

[0063] like Figure 7 and Figure 11 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.

[0064] 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.

[0065] like Figure 9 As shown, in the technical solution of this embodiment, the thickness T of the sealing plate 400 is 1.2mm to 1.8mm. If T is less than 1.2mm, 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 1.8mm, the thickness of the sealing plate 400 is too thick, and too much internal space of the shell 100 is occupied, affecting the arrangement of the pole group 200 and the pole assembly 300. By setting T to 1.2mm to 1.8mm, the structural strength of the sealing plate 400 is higher and not easy to be damaged, and the thickness of the sealing plate 400 is thinner, occupying less space in the shell 100, saving internal space, and improving space utilization.

[0066] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in the technical solution of this embodiment, the cover plate 600 is provided with a liquid injection hole 620 , and the liquid injection hole 620 is located between two open ports 610 , and each open port 610 is provided between two poles 310 .

[0067] In this way, the liquid injection hole 620 is integrated on the cover plate 600, which can realize the injection of the battery 1, and the two openings 610 are located on the opposite sides of the liquid injection hole 620, which can ensure that the positions of the openings 610 and the pole ears 330 are set correspondingly, making it easy to weld the pole ears 330 and the connecting pieces 320 through the openings 610.

[0068] like Figure 2As shown, in the technical solution of this embodiment, the distance H1 between the sealing plate 400 and the liquid injection hole 620 is not less than 2 mm. The distance H1 between the sealing plate 400 and the liquid injection hole 620 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. In this way, there is sufficient clearance between the sealing plate 400 and the liquid injection hole 620, preventing the liquid injection hole 620 from being affected when the sealing plate 400 is welded to the cover plate 600, ensuring the effective smoothness of the liquid injection hole 620, enabling the battery 1 to be filled with liquid normally, and facilitating the improvement of the yield rate of the battery 1.

[0069] As Figure 2 shown, in the technical solution of this embodiment, the distance H2 between the sealing plate 400 and the pole 310 is not less than 2 mm, that is, the distance between each sealing plate 400 and any one pole 310 is not less than 2 mm. The distance H2 between the sealing plate 400 and the nearest pole 310 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. In this way, there is sufficient clearance between the sealing plate 400 and the pole 310, preventing the pole 310 from being affected when the sealing plate 400 is welded to the cover plate 600, ensuring the cleanliness of the outer surface of the pole 310, enabling the battery 1 to be filled with liquid normally, and facilitating the improvement of the yield rate of the battery 1.

[0070] As Figure 8 and Figure 10 shown, in the technical solution of this embodiment, there are multiple bosses 510, and the arrangement direction of the multiple bosses 510 is perpendicular to the arrangement direction of the two sealing plates 400. There are multiple grooves 410, and the arrangement direction of the multiple grooves 410 is perpendicular to the arrangement direction of the two sealing plates 400, and the multiple bosses 510 and the multiple grooves 410 are connected in a one-to-one correspondence.

[0071] By providing the cooperation of multiple bosses 510 and multiple grooves 410, there are multiple connection points 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, the arrangement direction of the two sealing plates 400 can be the width direction of the battery 1, and the arrangement direction of the multiple bosses 510 can be the thickness direction of the battery 1. Since the pole 310, the sealing plate 400, and the liquid injection hole 620 are arranged along the width direction of the battery 1, the size of the sealing plate 400 in the width direction of the battery 1 is small. By arranging the multiple bosses 510 along the thickness direction of the battery 1, the number of bosses 510 can be increased, making the connection strength between the insulating plate 500 and the sealing plate 400 greater.

[0072] According to an embodiment of the present invention, on the other hand, a battery 1 is further provided. The battery 1 includes a housing 100, a pole group 200, and the battery cover plate of the above embodiment.

[0073] The housing 100 is provided with a disassembly and assembly opening. The cover plate 600 is connected to the housing 100 and seals the disassembly and assembly opening. The cover plate 600 and the housing 100 enclose an accommodation space. The electrode group 200 is arranged in the accommodation space and includes tab ears 330. The electrode group 200 further includes an electrode group body, and the electrode group body is connected to the tab ears 330. The number of the tab ears 330 and the pole column assemblies 300 may be the same. At least two tab ears 330 are connected to at least two pole column assemblies 300 in a one-to-one correspondence. The tab ears 330 are located in the tab ear space and are connected to the connecting pieces 320 of the corresponding pole column assemblies 300.

[0074] During the processing of the battery 1, when the cover plate 600 and the housing 100 are not connected, the electrode group 200 can be installed into the housing 100 through the disassembly and assembly opening, and then the pole column 310 can be installed on the cover plate 600, and the pole column 310 and the connecting piece 320 are welded and connected. Then, the connecting piece 320 and the tab ear 330 can be welded together through the open port 610. For example, the connecting piece 320 and the tab ear 330 can be welded by welding processes such as laser welding or ultrasonic welding, reducing the welding process of the connecting piece 320 and the tab ear 330.

[0075] Since the tab ears 330 are located in the tab ear space, that is, the tab ears 330 are located between the insulating plate 500 and the connecting piece 320, the tab ears 330 only need to be bent once, which can reduce the bending process of the tab ears 330, reduce the processing difficulty, improve the production efficiency, and improve the space utilization rate inside the battery 1.

[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 present invention uses the battery 1 of the above embodiment and has the advantages of good insulation performance and convenient processing.

[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 all fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: A cover plate, wherein the cover plate is provided with at least two openings; At least two sealing assemblies, each of which comprises a sealing plate and an insulating plate, wherein the sealing plate is connected to the cover plate, each of which covers one of the openings, wherein one of the insulating plate and the sealing plate is provided with a boss and the other is provided with a groove, wherein the boss is inserted into the groove; At least two pole assemblies, each of which includes a pole and a connecting piece, the pole is arranged on the cover plate, the connecting piece is connected to the pole, the connecting piece is located on the side of the insulating plate facing away from the sealing plate, and a pole ear space is defined between the connecting piece and the insulating plate.

2. The battery cover 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, R≥0.5mm.

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

7. The battery cover according to any one of claims 1 to 6, characterized in that: The cover plate is provided with a liquid injection hole, and the liquid injection hole is located between the two openings. Each opening is provided between two poles. The distance H1 between the sealing plate and the liquid injection hole is ≥2mm, and the distance H2 between the sealing plate and the pole is ≥2mm.

8. The battery cover according to any one of claims 1 to 6, characterized in that: There are multiple bosses, and the arrangement direction of the multiple bosses is perpendicular to the arrangement direction of the two sealing plates; There are a plurality of grooves, and the arrangement direction of the plurality of grooves is perpendicular to the arrangement direction of the two sealing plates. The plurality of bosses and the plurality of grooves are connected in a one-to-one correspondence.

9. A battery, characterized in that: include: A housing, wherein the housing is provided with a disassembly opening; The battery cover according to any one of claims 1 to 8, wherein the cover is connected to the shell and covers the disassembly opening, and the cover and the shell together form a receiving space; A pole group is arranged in the accommodating space and includes a pole ear, and the pole ear is located in the pole ear space and connected to the connecting sheet.

10. A battery pack, characterized in that: Comprising a battery according to claim 9.

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