Battery cover plate and battery

Abstract

A battery cover plate and a battery. The battery cover plate comprises a top cover member (10) and a first insulating member (30), wherein two terminal posts (20) run through the top cover member (10) in an insulating manner, and the two terminal posts (20) are arranged at an interval in a first direction; the first insulating member (30) is arranged at the bottom of the top cover member (10), and the terminal posts (20) run through the first insulating member (30); and two pins (40) are embedded in two sides of the first insulating member (30) in the first direction, the two pins (40) are electrically connected to the two terminal posts (20) in one-to-one correspondence, and a fuse opening (411) is formed at the portion of each of the pins (40) embedded in the first insulating member (30).

Description

Battery cover and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 28, 2023, with application number 202323221853.1, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, for example, to a battery cover and a battery. Background Art

[0003] In the battery field, lithium batteries are mainly square-shell cells, cylindrical cells and soft-pack cells, among which square-shell cells have a larger market share.

[0004] Square shell battery cells are usually composed of a shell, a battery cover and a battery cell. However, this structure still has some problems in achieving circuit-breaking protection. The battery cover is provided with a pole connecting the internal circuit and the external circuit, and the bottom of the cover is also provided with a pin connected to the pole. The pin is connected to the battery cell and the pole to achieve electrical connection between the battery cell and the pole. Generally, a fuse is also provided at the pin to achieve protection for the circuit. However, there is a certain distance between the top cover and the battery cell, and this distance may change during use due to factors such as the expansion of the battery cell, thereby causing problems such as the fuse being bent and deformed, the fuse being easily in direct contact with the battery cell, and causing short circuits / failure to achieve circuit-breaking protection. In related technologies, an insulating film is often applied to the welding surface after the pins are welded to achieve insulation between the fuse and the battery cell. However, problems such as the fuse being bent and deformed still exist, and the solution is not effective, and the manufacturing process is increased. Summary of the Invention

[0005] The present application provides a battery cover that can improve battery safety, simplify the manufacturing process, improve production efficiency, and improve pin deformation.

[0006] Battery cover, including:

[0007] A top cover, wherein two poles are insulated and penetrated through the top cover, and the two poles are spaced apart along the first direction;

[0008] The first insulating member is arranged at the bottom of the above-mentioned top cover member, and the above-mentioned pole is passed through the above-mentioned first insulating member; the above-mentioned first insulating member is embedded with two pins on both sides along the above-mentioned first direction, and the above-mentioned two pins are electrically connected with the above-mentioned two poles in a one-to-one correspondence. The part where the above-mentioned pins are embedded in the above-mentioned first insulating member is provided with a fuse.

[0009] In one embodiment, the first insulating member is provided with embedding grooves on both sides along the first direction, and one end of the pin is inserted into the embedding groove.

[0010] In one embodiment, two side walls of the embedding groove opposite to each other along the second direction are provided with avoidance holes, and the avoidance holes are arranged corresponding to the poles to facilitate the installation of the pins and the poles. The second direction is perpendicular to the first direction.

[0011] In one embodiment, the embedding groove is a U-shaped groove, a round groove or an L-shaped opening groove.

[0012] In one embodiment, the pin includes a first connecting portion and a second connecting portion perpendicular to each other, the first connecting portion is embedded in the first insulating member and electrically connected to the corresponding pole, the second connecting portion can be electrically connected to the battery cell, and a fuse is provided on the first connecting portion.

[0013] In one embodiment, the second connecting portion is further provided with an arched portion.

[0014] In one embodiment, the pins and the poles are connected by welding.

[0015] In one embodiment, the top wall of the first insulating member is disposed between the pole and the top cover.

[0016] In one embodiment, a second insulating member is further included, and the second insulating member is sealed and disposed between the pole and the top cover to insulate the pole and the top cover.

[0017] The present application provides a battery, which includes a shell, a battery cell and a battery cover as described in any of the above schemes, the battery cell is arranged in the shell, and the battery cover is sealed and connected to the shell; this design can simplify the manufacturing process, improve production efficiency, and improve pin deformation, reduce the risk of deformation of the battery cell when it is inserted into the shell, and improve the battery yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is an axonometric view of a battery cover provided in an embodiment of the present application;

[0019] FIG2 is an exploded view of a battery cover provided in an embodiment of the present application;

[0020] FIG3 is a cross-sectional view of a battery cover provided in an embodiment of the present application;

[0021] FIG4 is a partial enlarged view of point A in FIG3 .

[0022] In the picture:

[0023] 10. Top cover; 11. Mounting hole; 12. Explosion-proof valve; 13. Liquid injection hole;

[0024] 20. Pole; 21. First column; 22. Second column;

[0025] 30. First insulating member; 31. Embedding groove; 32. Avoidance hole; 33. Top wall;

[0026] 40, pin; 41, first connection portion; 411, fuse; 42, second connection portion;

[0027] 50. Second insulating member; 51. First sealed insulating portion; 52. Second sealed insulating portion. DETAILED DESCRIPTION

[0028] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; or internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application according to the circumstances.

[0029] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0031] This embodiment provides a battery cover, which can simplify the manufacturing process, improve production efficiency, and improve the deformation of the pins 40, thereby reducing the risk of deformation when the battery cell is placed in the shell.

[0032] In this embodiment, the first direction is the X direction in FIG. 1 to FIG. 3 , and the second direction is the Y direction in FIG. 1 to FIG. 3 , and the X direction is perpendicular to the Y direction.

[0033] Please refer to Figures 1 and 2. The battery cover includes a top cover 10 and a first insulating member 30. Two poles 20 are insulated and penetrated on the top cover 10, and the two poles 20 are spaced apart along a first direction. The first insulating member 30 is provided at the bottom of the top cover 10, and the poles 20 are penetrated by the first insulating member 30. Two pins 40 are embedded on both sides of the first insulating member 30 along the first direction. The two pins 40 are electrically connected to the two poles 20 in a one-to-one correspondence. The portion where the pins 40 are embedded in the first insulating member 30 is provided with a fuse 411.

[0034] The battery cover in this embodiment embeds the pin 40 into the first insulating member 30 so that the fuse opening 411 on the pin 40 is covered in the insulating member to achieve insulation at the fuse opening 411, thereby avoiding damage to the battery cell after the fuse opening 411 melts, reducing the risk of internal short circuit, fire and explosion of the battery cell, and reducing the process of re-applying the insulating film, simplifying the process flow and improving production efficiency; and the embedding of the pin 40 into the first insulating member 30 also provides the pin 40 with a force in the second direction, so that the pin 40 will not be easily pulled and deformed by the battery cell, thereby improving the deformation of the pin 40.

[0035] Referring to FIG. 2 , in this embodiment, two mounting holes 11 are defined on the top cover 10 along a first direction for mounting the pole 20 .

[0036] The top cover 10 is also provided with a liquid injection hole 13, which is configured to inject electrolyte into the battery after the battery is installed.

[0037] An explosion-proof valve 12 is provided on the top cover 10. The explosion-proof valve 12 is provided to protect the safety of the battery. That is, when the internal pressure of the battery is too high, the explosion-proof valve 12 will open and let the gas flow out to facilitate the pressure relief of the battery and avoid greater safety problems.

[0038] 1 to 4 , in this embodiment, the first insulating member 30 has embedding grooves 31 on both sides along the first direction. One end of the pin 40 is inserted into the embedding groove 31 so that the pin 40 can be embedded in the first insulating member 30 .

[0039] The embedding groove 31 is a U-shaped groove, a round groove or an L-shaped opening groove, all of which can achieve embedding of the pin 40 .

[0040] Exemplarily, the embedding groove 31 in this embodiment is an L-shaped open groove, that is, its opening is an L-shaped groove, so that the pin 40 can be inserted into the embedding groove 31 from the L-shaped opening side, and the pin 40 is limited on the opposite L-shaped groove wall side to facilitate the installation positioning of the pin 40.

[0041] The insertion slot 31 has two opposing sidewalls along the second direction, each with a corresponding hole 32. The holes 32 are positioned to facilitate installation of the terminal 20 and the pin 40. The second direction is perpendicular to the first direction. The holes 32 provide clearance for the terminal 20 during installation. Furthermore, when welding the pin 40 to the terminal 20, the welding area is cleared, facilitating installation and connection of the terminal 20.

[0042] In one embodiment, the top wall 33 of the first insulating member 30 is arranged between the pole 20 and the top cover 10, which can insulate the pole 20 between the top cover and limit the first insulating member 30, so that when the pole 20 is fixed to the top cover 10, the position of the first insulating member 30 can be limited by the pole 20.

[0043] Referring to Figures 1, 2, and 4, in this embodiment, the pin 40 includes a first connecting portion 41 and a second connecting portion 42, which are perpendicular to each other. The first connecting portion 41 is embedded in the first insulating member 30 and electrically connected to the corresponding terminal 20. The second connecting portion 42 can be electrically connected to the battery cell. The first connecting portion 41 is provided with a fuse 411. This arrangement allows the pin 40 to connect to the terminal 20 and to the battery cell; it also allows the fuse 411 to be disposed within the first insulating member 30 for insulation.

[0044] The pin 40 and the terminal 20 are welded together to ensure the connection strength between the two and avoid the occurrence of poor contact. The pin 40 and the battery cell are welded together to ensure the connection strength between the pin 40 and the battery cell and avoid the occurrence of poor contact.

[0045] The second connecting portion 42 is also provided with an arch portion, that is, a C-shaped curved portion similar to an arch is provided on the second connecting portion 42, which can be straightened as it is pulled on both sides, and is configured to compensate for the amount of pulling on both sides, so that it buffers the pulling of the pin 40 by the battery cell in the second direction, thereby preventing the pin 40 from being pulled and deformed.

[0046] Referring to Figure 2, in this embodiment, the pole 20 includes a first column 21 and a second column 22. The first column 21 is sealed and insulated and passes through the first insulating member 30 and the top cover 10 and is fixedly connected to the second column 22. The second column 22 is insulated and arranged on a side of the top cover 10 away from the first insulating member 30 to facilitate the installation and external connection of the pole 20.

[0047] The first column 21 includes a connected limiting portion and a column portion. The column portion is sealed and insulated and penetrates the first insulating member 30 and the top cover 10 . The limiting portion abuts against the top wall 33 of the first insulating member 30 to achieve positioning of the first column 21 .

[0048] The battery top cover further includes a second insulating member 50 , which is sealed and disposed between the pole 20 and the top cover 10 to insulate the pole 20 from the top cover 10 .

[0049] The second insulating member 50 includes a first sealing insulating portion 51 and a second sealing insulating portion 52 . The first sealing insulating portion 51 is disposed between the first column 21 and the top cover 10 , and the second sealing insulating portion 52 is disposed between the second column 22 and the top cover 10 to insulate the pole 20 .

[0050] The first sealing insulating portion 51 and the second sealing insulating portion 52 are both provided with bent corner portions, that is, both have multiple step portions, so that the first sealing insulating portion 51 can insulate and seal the surface of the first column 21 and the top cover 10 along the second direction, and can also insulate and seal the first column 21 and the hole wall of the mounting hole 11; the second sealing insulating portion 52 can insulate and seal the surface of the second column 22 and the top cover 10 along the second direction, and can also insulate and seal the second column 22 and the hole wall of the mounting hole 11, so as to achieve better sealing and insulation of the first column 21 and the second column 22 and the connection between the two.

[0051] This embodiment also provides a battery comprising a housing, a battery cell, and a battery cover according to any of the above-described embodiments. The battery cell is disposed within the housing, and the battery cover is sealed to the housing. This battery simplifies the manufacturing process, improves production efficiency, and improves deformation of the pins 40, reducing the risk of deformation of the battery cell when inserted into the housing, thereby improving the battery's yield rate.

Claims

1. Battery cover, including: A top cover (10), wherein two poles (20) are insulated and penetrated through the top cover (10), and the two poles (20) are spaced apart along a first direction; A first insulating member (30), wherein the first insulating member (30) is arranged at the bottom of the top cover member (10), and the pole (20) is passed through the first insulating member (30); two pins (40) are embedded on both sides of the first insulating member (30) along the first direction, and the two pins (40) are electrically connected to the two poles (20) in a one-to-one correspondence, and a fuse opening (411) is provided at a portion of the pin (40) embedded in the first insulating member (30).

2. The battery cover according to claim 1, wherein: The first insulating member (30) is provided with embedding grooves (31) on both sides along the first direction, and one end of the pin (40) is inserted into the embedding groove (31).

3. The battery cover according to claim 2, wherein: The embedding groove (31) is provided with avoidance holes (32) on two opposite side walls along a second direction, the avoidance holes (32) being arranged corresponding to the pole (20) to facilitate the installation of the pin (40) and the pole (20), the second direction being perpendicular to the first direction.

4. The battery cover according to claim 2, wherein: The embedding groove (31) is a U-shaped groove, a round groove or an L-shaped opening groove.

5. The battery cover according to claim 1, wherein: The pin (40) comprises a first connecting portion (41) and a second connecting portion (42) which are perpendicular to each other, the first connecting portion (41) being embedded in the first insulating member (30) and electrically connected to the corresponding pole (20), the second connecting portion (42) being electrically connected to the battery cell, and the first connecting portion (41) being provided with a fuse opening (411).

6. The battery cover according to claim 5, wherein: The second connecting portion (42) is also provided with an arched portion.

7. The battery cover according to claim 1, wherein: The pin (40) and the pole (20) are connected by welding.

8. The battery cover according to claim 1, wherein: The top wall (33) of the first insulating member (30) is arranged between the pole (20) and the top cover member (10).

9. The battery cover plate according to any one of claims 1 to 8, further comprising a second insulating member (50), wherein the second insulating member (50) is sealed and arranged between the pole (20) and the top cover member (10) to insulate the pole (20) and the top cover member (10).

10. A battery comprising a shell, a battery cell and a battery cover as claimed in any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the battery cover is sealed and connected to the shell.

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