Top cover assembly and battery

Abstract

A top cover assembly and a battery. The top cover assembly comprises a cover plate (1) and a sealing member (7), wherein a first electrolyte injection hole (104) is provided on the cover plate (1); first insulating members (2) are provided on the side of the cover plate (1) away from a battery cell; the first insulating members (2) are configured to isolate the cover plate (1) from poles (3); a second electrolyte injection hole (204) is provided on one first insulating member (2); the second electrolyte injection hole (204) is in communication with the first electrolyte injection hole (104); the sealing member (7) is inserted into the second electrolyte injection hole (204) and the first electrolyte injection hole (104). According to the top cover assembly, by providing the second electrolyte injection hole (204) on the first insulating member (2), the height of the second electrolyte injection hole (204) can be increased, thereby increasing the height of the sealing member (7) and increasing the distance between the sealing member (7) and the battery cell, such that on one hand, position interference between the sealing member (7) and the battery cell can be avoided and the safety performance of the battery is improved, and on the other hand, the space reserved for the sealing member (7) in a case can be reduced, the utilization rate of an internal space of the battery case is increased, and then the energy density of the battery is improved.

Description

Top cover assembly and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 16, 2023, with application number 202321556456.7. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a top cover assembly and a battery. Background Art

[0003] The battery cover is equipped with an injection hole for injecting electrolyte into the battery case. After injection, a sealant is used to seal the injection hole to prevent leakage. In related art, space is reserved inside the case during design for the injection hole sealant to prevent the sealant from squeezing the battery cell at the injection hole. SUMMARY OF THE INVENTION

[0004] The related technology has the following problems: if the reserved size is too small, the remaining space will be small, and the seal at the injection hole will easily press on the battery cell, resulting in slow injection speed and more interference with the battery cell, which will reduce the safety of the battery. If the reserved size is too large, the utilization rate of the internal space of the shell will decrease, reducing the energy density of the battery.

[0005] In a first aspect, the present application provides a top cover assembly. The top cover assembly includes a cover plate and a sealing member. The cover plate is provided with a first liquid injection hole. A first insulating member is provided on a side of the cover plate away from the battery cell, the first insulating member being configured to separate the cover plate from the battery cell. The first insulating member is provided with a second liquid injection hole, the second liquid injection hole being connected to the first liquid injection hole, and the sealing member is inserted into the second liquid injection hole and the first liquid injection hole.

[0006] In a second aspect, the present application further provides a battery, comprising a shell, a battery cell and a top cover assembly, wherein the battery cell is disposed in a receiving cavity of the shell, and the top cover assembly blocks an opening of the receiving cavity. Beneficial effects

[0007] The cover assembly provided in the present application can increase the height of the second liquid injection hole by setting a second liquid injection hole on the first insulating part, thereby increasing the height of the seal and increasing the distance between the seal and the battery cell. On the one hand, it can avoid positional interference between the seal and the battery cell and improve the safety performance of the battery. On the other hand, it can reduce the space reserved for the seal in the shell, improve the utilization rate of the internal space of the battery shell, and thus improve the energy density of the battery.

[0008] The battery provided in this application has a high safety factor and high energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic structural diagram of some embodiments of the top cover assembly provided in the present application.

[0010] FIG2 is a schematic diagram of an exploded view of some embodiments of the top cover assembly provided in the present application.

[0011] FIG3 is a schematic cross-sectional view of some embodiments of the top cover assembly provided in the present application.

[0012] FIG4 is a schematic diagram of some embodiments of the cover plate and the first insulating member provided in the present application.

[0013] FIG5 is a schematic cross-sectional view of some embodiments of the cover plate and the first insulating member provided in the present application.

[0014] FIG6 is a schematic diagram of some embodiments of the terminal board provided in this application.

[0015] FIG7 is a schematic cross-sectional view of some other embodiments of the top cover assembly provided in the present application.

[0016] FIG8 is a schematic diagram of some other embodiments of the cover plate and the first insulating member provided in the present application.

[0017] FIG9 is a schematic diagram of some other embodiments of the terminal board provided in this application.

[0018] FIG10 is a schematic diagram of some other embodiments of the cover provided in this application.

[0019] Description of reference numerals:

[0020] 1. Cover plate; 101. First mounting hole; 102. Explosion-proof hole; 103. Concave-convex structure; 104. First injection hole; 2. First insulating member; 201. Second mounting hole; 202. First boss; 203. Second boss; 204. Second injection hole; 205. First mounting groove; 206. Raised rib; 207. Wall; 3. Pole; 301. Column body; 302. Terminal board; 3021. Avoidance structure; 3022. Second mounting groove; 4. Second insulating member; 401. Third injection hole; 5. Connecting piece; 6. Explosion-proof valve; 7. Sealing member; 701. Sealing column; 702. Sealing cap; 7021. Avoidance groove; 8. Sealing ring. Modes for Carrying Out the Invention

[0021] 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; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," "right," "front," and "rear" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, 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 for descriptive purposes only and do not have any special meanings.

[0024] As shown in Figures 1 to 5 and 10, the present application provides a top cover assembly, including a cover plate 1 and a sealing member 7. The cover plate 1 is provided with a first liquid injection hole 104. A first insulating member 2 is provided on the side of the cover plate 1 away from the battery cell. The first insulating member 2 is configured to separate the cover plate 1 and the pole 3. The first insulating member 2 is provided with a second liquid injection hole 204, which is connected to the first liquid injection hole 104. The sealing member 7 is inserted into the second liquid injection hole 204 and the first liquid injection hole 104. By providing the second liquid injection hole 204 on the first insulating member 2, the height of the second liquid injection hole 204 can be increased, thereby increasing the height of the sealing member 7 and increasing the distance between the sealing member 7 and the battery cell. On the one hand, this can avoid positional interference between the sealing member 7 and the battery cell, thereby improving the safety performance of the battery. On the other hand, it can reduce the space reserved for the sealing member 7 in the shell, improve the utilization rate of the internal space of the battery shell, and thus improve the energy density of the battery.

[0025] In some embodiments, a first boss 202 is provided on one side of the first insulating member 2 close to the cover plate 1 , the first boss 202 is inserted into the first liquid injection hole 104 , the first boss 202 is in contact with the hole wall of the first liquid injection hole 104 , and the second liquid injection hole passes through the first boss 202 . By arranging a first boss 202 on the first insulating member 2, the first boss 202 can block the first liquid injection hole 104 to prevent the electrolyte from flowing out from the gap between the first liquid injection hole 104 and the first insulating member 2; by arranging a second liquid injection hole 204 on the first boss 202, the length of the second liquid injection hole 204 can be extended, thereby increasing the contact area between the sealing member 7 and the hole wall of the second liquid injection hole 204, thereby improving the sealing effect; in this embodiment, the sealing member 7 is clamped to the second liquid injection hole 204, and the sealing member 7 and the second liquid injection hole 204 are interference fit. After the sealing member 7 is inserted into the second liquid injection hole 204, the first boss 202 will be clamped between the sealing member 7 and the hole wall of the first liquid injection hole 104, thereby achieving sealing.

[0026] In some embodiments, the pole 3 includes a pole body 301 and a terminal plate 302, the first insulating member 2 is arranged between the terminal plate 302 and the cover plate 1, the cover plate 1 is provided with a first mounting hole 101, the first insulating member 2 is provided with a second mounting hole 201, the pole body 301 passes through the first mounting hole 101 and the second mounting hole 201 and is connected to the terminal plate 302, and the terminal plate 302 is provided with an avoidance structure 3021; ​​by providing the avoidance structure 3021 on the terminal plate 302, the distance between the second injection hole 204 and the second mounting hole 201 can be shortened, thereby reducing the size of the first insulating member 2, saving the material of the top cover assembly, and reducing costs. Referring to Figures 7 to 10, in one embodiment, the avoidance structure 3021 is a avoidance hole, which is spaced apart from the edge of the terminal plate 302. Referring to Figures 1 to 6, the avoidance structure 3021 is a avoidance gap. Setting the avoidance structure 3021 as an avoidance gap can reduce the distance between the second liquid injection hole 204 and the second mounting hole 201 and reduce the size of the first insulating member 2. The position and type of the avoidance structure 3021 can be selected according to the actual design requirements of the battery.

[0027] 1 to 6 , in this embodiment, the relief structure 3021 is a relief notch. A second boss 203 is provided on the side of the first insulating member 2 away from the cover plate 1. The second boss 203 is inserted into the relief notch, and the second liquid injection hole 204 extends through the second boss 203. The provision of the second boss 203 increases the height of the second liquid injection hole 204, thereby reducing the size of the sealing member 7 extending into the housing's accommodating cavity and reducing the space occupied by the sealing member 7 in the housing's accommodating cavity.

[0028] For example, a first mounting groove 205 is provided on the second boss 203, and a second liquid injection hole 204 extends through the bottom of the first mounting groove 205. The sealing member 7 includes a sealing column 701 and a sealing cap 702. The sealing column 701 blocks the second liquid injection hole 204, and the sealing cap 702 is inserted into the first mounting groove 205. The sealing cap 702 is ultrasonically welded to the first insulating member 2. By providing a split sealing column 701 and sealing cap 702, after the sealing column 701 blocks the second liquid injection hole 204, the sealing cap 702 can form a secondary seal, thereby improving the sealing effect of the sealing member 7 and preventing leakage. By providing the first mounting groove 205, a space is provided for the sealing cap 702 to accommodate it, facilitating the connection between the sealing cap 702 and the first insulating member 2. In some embodiments, the sealing cap 702 is snap-fitted into the first mounting groove 205 , and an interference fit can be employed therebetween. Both the sealing cap 702 and the first insulating member 2 are non-metallic components. Because the sealing cap 702 and the first insulating member 2 are ultrasonically welded, they are made of the same material: PPS (polyphenylene sulfide). The sealing post 701 is also non-metallic and can be made of PPS or other sealing materials such as rubber.

[0029] In some embodiments, the sealing cap 702 does not protrude beyond the end surface of the second boss 203. By setting the sealing cap 702 not to protrude beyond the end surface of the second boss 203, the sealing member 7 can be prevented from being higher than the original height of the top cover assembly and from affecting the electrical connection between the terminal board 302 and external devices.

[0030] 3 and 5 , in some embodiments, a rib 206 is provided at the bottom of the first mounting groove 205. The rib 206 abuts against the lower surface of the sealing cap 702. The rib 206 allows for compression between the sealing cap 702 and the first insulating member 2 after welding, thereby improving the sealing effect.

[0031] For example, a surrounding wall 207 is provided around the periphery of the first insulating member 2, the terminal plate 302 is located within the annular region of the surrounding wall 207, and the end surface of the second boss 203 is flush with the end surface of the surrounding wall 207. By arranging the end surface of the second boss 203 to be flush with the end surface of the surrounding wall 207, the difficulty of manufacturing the first insulating member 2 can be reduced.

[0032] Referring to Figures 7 to 10, in this embodiment, the avoidance structure 3021 is a avoidance hole. A second mounting groove 3022 is provided on the side of the terminal plate 302 away from the cover plate 1. The avoidance hole extends through the bottom of the second mounting groove 3022. The sealing member 7 includes a sealing post 701 and a sealing cap 702. The sealing post 701 blocks the avoidance hole and the second liquid injection hole 204. The sealing cap 702 is inserted into the second mounting groove 3022 and is laser welded to the terminal plate 302. In this embodiment, the sealing cap 702 and the terminal plate 302 are made of the same material and are both metal parts. In this embodiment, the first liquid injection hole 104 is adjacent to the positive electrode 3 of the battery. Therefore, the sealing cap 702 and the terminal plate 302 are both made of aluminum. In other embodiments, the sealing cap 702 is snapped into the second mounting groove 3022, and an interference fit is adopted between the sealing cap 702 and the second mounting groove 3022. Of course, the sealing cap 702 should not protrude from the surface of the terminal plate 302 to avoid increasing the overall size of the battery.

[0033] 3 and 7 , a side of the sealing cap 702 facing the sealing column 701 is provided with an avoidance groove 7021, and the avoidance groove 7021 is directly opposite to the sealing column 701. If there is a precision error in the assembly, causing the end of the sealing column 701 to protrude from the bottom of the first mounting groove 205, the end of the sealing column 701 can be inserted into the avoidance groove 7021 to prevent the sealing column 701 from lifting the sealing cap 702.

[0034] In some embodiments, the second insulating member 4 is disposed on the side of the cover plate 1 proximal to the battery cell. The second insulating member 4 is used to separate the cover plate 1 from the battery cell. A third liquid injection hole 401 is provided on the second insulating member 4. The third liquid injection hole 401 is positioned opposite the second liquid injection hole 204. The end of the sealing member 7 is positioned within the third liquid injection hole 401. By positioning the end of the sealing member 7 within the third liquid injection hole 401, the end of the sealing member 7 can be prevented from protruding beyond the second insulating member 4, thereby reducing the space occupied by the sealing member 7 in the accommodating cavity.

[0035] In some embodiments, the cover plate 1 and the first insulating member 2 are integrally formed. By providing the integrally formed cover plate 1 and the first insulating member 2, on the one hand, the connection stability between the two can be improved, and on the other hand, the sealing effect of the first boss 202 on the first injection hole 104 can be improved to avoid leakage. The cover plate 1 is a metal part, and the first insulating member 2 is a plastic part. During manufacturing, the molded cover plate 1 can be placed in an injection mold, and then injection molding is performed into the mold to directly mold the first insulating member 2 on the cover plate 1. During injection molding, a core can be used in the mold to reserve the position of the second injection hole 204. The aperture of the second injection hole 204 is 2.0mm-5mm. For example, the aperture of the second injection hole 204 can be 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or 5.0mm.

[0036] In some embodiments, the end surface of the first boss 202 near one end of the battery cell is flush with the side surface of the cover plate 1. Since the cover plate 1 and the first insulating member 2 are integrally injection molded, setting the end surface of the first boss 202 flush with the side surface of the cover plate 1 can reduce the difficulty of molding the cover plate 1 and the first insulating member 2.

[0037] In some embodiments, a concave-convex structure 103 is provided on the cover plate 1, which can prevent the first insulating member 2 from rotating and improve the connection stability between the two.

[0038] Exemplarily, the top cover assembly further includes a connecting piece 5 , which is welded to the column body 301 of the pole 3 and the tab of the battery cell respectively to achieve electrical conduction inside the battery.

[0039] In some embodiments, a sealing ring 8 is clamped between the column body 301 of the pole 3 and the cover plate 1 to prevent the electrolyte from flowing out of the first mounting hole 101; in addition, an explosion-proof hole 102 is provided on the cover plate 1, and an explosion-proof valve 6 is provided at the explosion-proof hole 102.

[0040] This embodiment also provides a battery comprising a housing, a battery cell, and a top cover assembly. The battery cell is disposed within a receiving cavity of the housing, and the top cover assembly seals the opening of the receiving cavity. Because the top cover assembly can elevate the height of a seal 7, preventing contact between the seal 7 and the battery cell, the battery including this top cover assembly is highly safe. Because the seal 7 occupies little space in the receiving cavity, it can improve space utilization in the receiving cavity and increase the energy density of the battery.

Claims

1. A top cover assembly, comprising a cover plate (1) and a sealing member (7), wherein the cover plate (1) is provided with a first liquid injection hole (104), a first insulating member (2) is provided on one side of the cover plate (1), the first insulating member (2) is configured to separate the cover plate (1) and the pole (3), a second liquid injection hole (204) is provided on the first insulating member (2), the second liquid injection hole (204) is connected to the first liquid injection hole (104), and the sealing member (7) is inserted into the second liquid injection hole (204) and the first liquid injection hole (104).

2. The top cover assembly according to claim 1, in, A first boss (202) is provided on one side of the first insulating member (2) close to the cover plate (1); the first boss (202) is inserted into the first injection hole (104); the first boss (202) is in contact with the hole wall of the first injection hole (104); and the second injection hole (204) passes through the first boss (202).

3. The top cover assembly according to claim 2, in, The sealing member (7) is snap-fitted into the second liquid injection hole (204).

4. The top cover assembly according to claim 2, in, The sealing component (7) is connected to the first insulating component (2) by welding.

5. The top cover assembly according to claim 1, in, The pole (3) comprises a pole body (301) and a terminal plate (302); the cover plate (1) is provided with a first mounting hole (101); the pole body (301) passes through the first mounting hole (101) and is connected to the terminal plate (302); the first insulating member (2) is arranged between the terminal plate (302) and the cover plate (1); the terminal plate (302) is provided with an avoidance structure (3021); the avoidance structure (3021) is an avoidance hole, and the avoidance hole is connected to the second injection hole (204).

6. The top cover assembly according to claim 1, in, The pole (3) comprises a pole body (301) and a terminal plate (302); the cover plate (1) is provided with a first mounting hole (101); the pole body (301) passes through the first mounting hole (101) and is connected to the terminal plate (302); the first insulating member (2) is arranged between the terminal plate (302) and the cover plate (1); the terminal plate (302) is provided with an avoidance structure (3021); the avoidance structure (3021) is a avoidance notch; the avoidance notch is connected to the second injection hole (204).

7. The top cover assembly according to claim 5 or 6, in, A second boss (203) is provided on a side of the first insulating member (2) away from the cover plate (1); the second boss (203) is inserted into the avoidance structure (3021); and the second liquid injection hole (204) passes through the second boss (203).

8. The top cover assembly according to claim 7, in, The second boss (203) is provided with a first mounting groove (205), the second liquid injection hole (204) passes through the bottom of the first mounting groove (205), and the sealing member (7) comprises a sealing column (701) and a sealing cap (702), the sealing column (701) blocks the second liquid injection hole (204), and the sealing cap (702) is inserted into the first mounting groove (205).

9. The top cover assembly according to claim 8, in, The sealing cap (702) and the first insulating member (2) are connected by ultrasonic welding; or, The sealing cap (702) is snap-fitted into the first mounting groove (205) on the first insulating member (2).

10. The top cover assembly according to claim 9, in, The material of the sealing cap (702) includes PPS; and / or, The material of the first insulating member (2) includes PPS; and / or, The material of the sealing column (701) includes PPS or rubber.

11. The top cover assembly according to claim 8, in, The outer end surface of the sealing cap (702) does not protrude from the outer end surface of the second boss (203).

12. The top cover assembly according to claim 8, in, A convex rib (206) is provided at the bottom of the first installation groove (205), and the convex rib (206) abuts against the lower surface of the sealing cap (702).

13. The top cover assembly according to claim 5 or 6, in, A second mounting groove (3022) is provided on a side of the terminal plate (302) away from the cover plate (1); the avoidance hole runs through the bottom of the second mounting groove (3022); the sealing member (7) comprises a sealing column (701) and a sealing cap (702); the sealing column (701) blocks the avoidance hole and the second injection hole (204); and the sealing cap (702) is inserted into the second mounting groove (3022).

14. The top cover assembly according to claim 13, in, The sealing cap (702) is connected to the terminal plate (302) by welding; or, The sealing cap (702) is snap-fitted into the second mounting groove (3022) on the terminal board (302).

15. The top cover assembly according to claim 14, in, The sealing cap (702) is made of aluminum; and / or The material of the terminal plate (302) includes aluminum.

16. The top cover assembly according to any one of claims 1 to 6, further comprising a second insulating member (4), wherein the second insulating member (4) is arranged on a side of the cover plate (1) close to the battery cell, and a third liquid injection hole (401) is arranged on the second insulating member (4), and an end of the sealing member (7) is located in the third liquid injection hole (401).

17. A battery, include: A shell and a battery cell, wherein the battery cell is arranged in a receiving cavity of the shell; and The top cover assembly according to any one of claims 1 to 16, wherein the top cover assembly blocks the opening of the accommodating cavity.

18. The battery according to claim 17, further comprising a sealing ring (8), wherein the sealing ring (8) is arranged between the column body (301) of the pole (3) and the cover plate (1).

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