CN213989022U - Top cover structure and battery - Google Patents
Top cover structure and battery Download PDFInfo
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- CN213989022U CN213989022U CN202023142970.5U CN202023142970U CN213989022U CN 213989022 U CN213989022 U CN 213989022U CN 202023142970 U CN202023142970 U CN 202023142970U CN 213989022 U CN213989022 U CN 213989022U
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- insulating
- pole
- hole
- top cover
- insulating part
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a top cap structure and battery relates to battery sealing technical field. This top cap structure includes utmost point post, first insulating part, top cap piece and second insulating part. The top cover piece is provided with a pole post hole, the first insulating part and the second insulating part are respectively arranged on the top surface and the bottom surface of the top cover piece, and the pole post penetrates into the first insulating part, the pole post hole and the second insulating part and is riveted to the top of the first insulating part and the bottom of the second insulating part. The first insulating part is provided with an insulating extension part, and the insulating extension part extends into the pole hole and is positioned between the side surface of the pole and the inner wall of the pole hole. The top cover structure and the battery have the characteristic of high safety.
Description
Technical Field
The utility model relates to a battery sealing technical field particularly, relates to a top cap structure and battery.
Background
Utmost point post is in the assembling process on current battery top cap, and the metal fillings probably drop between last insulating part and sealing member to switch on utmost point post and top cap piece, make the battery form the short circuit or leak electricity, there is the potential safety hazard.
In view of the above, it is important to develop a top cap structure and a battery that can solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a top cap structure and battery, it all has the higher characteristics of security.
The utility model provides a technical scheme:
in a first aspect, an embodiment of the present invention provides a top cover structure, which includes a pole, a first insulating member, a top cover plate, and a second insulating member;
the top cover plate is provided with a pole post hole, the first insulating part and the second insulating part are respectively arranged on the top surface and the bottom surface of the top cover plate, and the pole post penetrates through the first insulating part, the pole post hole and the second insulating part and is riveted to the top of the first insulating part and the bottom of the second insulating part;
the first insulating part is provided with an insulating extending part, and the insulating extending part extends into the pole column hole and is positioned between the side surface of the pole column and the inner wall of the pole column hole.
With reference to the first aspect, in a first implementation manner of the first aspect, the bottom end of the pole column is provided with a supporting portion, and the supporting portion extends along a radial direction of the pole column and supports against the bottom of the second insulating member.
With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, the end of the insulating extension portion abuts against a side surface of the abutting portion, which is close to the top end of the pole.
With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, the insulation extension portion is annular and is sleeved on the pole.
With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, the top cover structure further includes a sealing ring, and the sealing ring is sleeved on the insulating extending portion and located between the top cover plate and the side surface of the abutting portion close to the top end of the pole.
With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the top cover structure further includes a sealing ring, and the sealing ring is sleeved on the insulating extending portion and located between the second insulating member and the side surface of the abutting portion, which is close to the top end of the pole.
With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, a sealing groove is formed in the bottom of the top cover plate, the sealing groove is disposed around the opening at the bottom end of the pole hole, and the sealing ring is compressed in the sealing groove.
With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, a hole through which the pole passes on the second insulating member is a second insulating hole, and an outer periphery of the second insulating hole is located in the sealing groove;
the sealing ring is positioned in a space enclosed by the bottom wall of the sealing groove, the outer side surface of the insulating extension part, the inner wall of the second insulating hole and the side surface of the abutting part close to the top end of the pole column.
With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, a hole through which the pole passes on the second insulating member is a second insulating hole, an outer periphery of the second insulating hole is recessed toward the top end of the pole to form a second insulating groove, and the abutting portion is located in the second insulating groove and abuts against a bottom wall of the second insulating groove.
In a second aspect, the embodiment of the present invention further provides a battery, which includes the top cover structure. The top cover structure comprises a pole, a first insulating piece, a top cover plate and a second insulating piece; the top cover plate is provided with a pole post hole, the first insulating part and the second insulating part are respectively arranged on the top surface and the bottom surface of the top cover plate, and the pole post penetrates through the first insulating part, the pole post hole and the second insulating part and is riveted to the top of the first insulating part and the bottom of the second insulating part; the first insulating part is provided with an insulating extending part, and the insulating extending part extends into the pole column hole and is positioned between the side surface of the pole column and the inner wall of the pole column hole.
Compared with the prior art, the embodiment of the utility model provides a beneficial effect of top cap structure includes for prior art:
this top cap structure includes utmost point post, first insulating part, top cap piece and second insulating part, wherein, the utmost point post hole has been seted up on the top cap piece, first insulating part and second insulating part set up respectively in the top surface and the bottom surface of top cap piece, utmost point post penetrates first insulating part, utmost point post hole and second insulating part, and rivet in the top of first insulating part and the bottom of second insulating part, and the insulating extension has on the first insulating part, this insulating extension extends to utmost point post downthehole, and this insulating extension is located between the side of utmost point post and the inner wall in utmost point post hole. Thereby through the isolated top cap piece of insulating extension and utmost point post side, even there is the metal fillings between insulating extension and utmost point post side, this metal fillings also are difficult for communicateing top cap piece and utmost point post side, and it makes the difficult short circuit that appears of top cap piece, the condition of electric leakage, and its security is higher.
The embodiment of the utility model provides a battery is the same for prior art's beneficial effect with foretell top cap structure for prior art's beneficial effect for prior art, no longer gives unnecessary details here.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a top cover structure provided by an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1.
Fig. 3 is an enlarged schematic view of the structure at III in fig. 2.
Fig. 4 is an enlarged view of a portion of the structure at IV in fig. 2.
Icon: 100-a top cover structure; 10-pole column; 101-a holding portion; 102-a holding surface; 11-a first insulator; 110 — an insulating extension; 111-a first insulation groove; 12-a second insulator; 121-a second insulating hole; 122-a second insulation groove; 13-top cover sheet; 131-pole hole; 132-a sealing groove; 14-a sealing ring; 15-riveting piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The terms "upper", "lower", "inner", "outer", "left", "right", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally used to place the products of the present invention, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used merely to facilitate the description of the present invention and to simplify the description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The following describes in detail embodiments of the present invention with reference to the accompanying drawings.
Example (b):
referring to fig. 1, fig. 1 is a schematic structural diagram of a top cover structure 100 according to an embodiment of the present invention.
The embodiment of the utility model provides a top cap structure 100, this top cap structure 100 have the higher characteristics of security. This top cap structure 100 can be applied to the battery, and top cap structure 100 is used for setting up in the electric core top of battery, because the battery has adopted the embodiment of the utility model provides a top cap structure 100, so this battery also has the higher characteristics of security.
The structural composition, the operation principle and the advantageous effects of the top cover structure 100 according to the embodiment of the present invention will be described in detail below.
Referring to fig. 2 and 3, fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1, and fig. 3 is an enlarged view of the structure taken along line III in fig. 2.
This top cap structure 100 includes utmost point post 10, first insulating part 11, top cap piece 13 and second insulating part 12, wherein, the utmost point post hole 131 has been seted up on the top cap piece 13, first insulating part 11 and second insulating part 12 set up respectively in the top surface and the bottom surface of top cap piece 13, utmost point post 10 penetrates first insulating part 11, utmost point post hole 131 and second insulating part 12, and rivet in the top of first insulating part 11 and the bottom of second insulating part 12, and have insulating extension 110 on the first insulating part 11, this insulating extension 110 extends to utmost point post hole 131 in, and this insulating extension 110 is located between the side of utmost point post 10 and the inner wall of utmost point post hole 131. So, top cap structure 100 accessible is isolated top cap piece 13 and utmost point post 10 side at insulating extension 110, even there is the metal fillings between insulating extension 110 and utmost point post 10 side, and this metal fillings also is difficult for communicateing top cap piece 13 and utmost point post 10 side, and it makes the difficult short circuit that appears of top cap piece 13, the condition of electric leakage, and its security is higher.
It should be noted that, in the present embodiment, the insulating extension portion 110 is annular, or the insulating extension portion 110 is sleeved on the pole 10, so that the inner wall of the insulating extension portion 110 corresponds to the side surface of the pole 10, thereby completely isolating the metal dust.
With continuing reference to fig. 3 and with further reference to fig. 4, fig. 4 is an enlarged view of a portion of the structure at IV in fig. 2.
The bottom end of the pole 10 may be provided with a supporting portion 101, and the supporting portion 101 extends along the radial direction of the pole 10 and supports against the bottom of the second insulating member 12. In other words, the terminal post 10 is riveted by the top end portion of the terminal post 10, and the abutting portion 101 at the bottom end of the terminal post 10 abuts against the bottom of the second insulating member 12, so as to complete the connection of the terminal post 10.
It should be noted that, in the present embodiment, the abutting portion 101 is annular, and is annularly disposed at the bottom end of the pole 10, so as to be more uniformly pressed on the bottom of the second insulating member 12 through the annular abutting portion 101.
Further, the end of the insulating extension portion 110 abuts against the side surface of the abutting portion 101 close to the top end of the pole 10. In other words, the insulating extension portion 110 extends to the bottom end of the post hole 131 and abuts against the abutting surface 102, wherein the abutting surface 102 is a side surface of the abutting portion 101 close to the top end of the post 10, so that even if metal chips fall into the side surface, the metal chips can be isolated by the insulating extension portion 110 abutting against the abutting surface 102, so as to further improve the safety of the top cover structure 100 and the battery.
Moreover, the top cover structure 100 may further include a sealing ring 14, and the sealing ring 14 is sleeved on the insulating extension portion 110 and located between the top cover 13 and the side surface of the abutting portion 101 close to the top end of the pole 10. In this way, the sealing ring 14 seals the gap between the abutting surface 102 and the end of the insulating extension 110, thereby further isolating metal filings from entering between the abutting surface 102 and the top cover plate 13, and further improving the safety of the top cover structure 100.
It should be noted that in other embodiments, the sealing ring 14 is sleeved between the second insulating member 12 and the side surface of the abutting portion 101 close to the top end of the pole post 10. Also sealing the gap between the abutment surface 102 and the end of the insulating extension 110.
And the gap between 11 and the sealing washer 14 of first insulating part on the current battery top cap is extended to utmost point post 10 side by top cap piece 13 level, and utmost point post 10 is in the assembling process, and the metal fillings probably drop to the gap between 11 and the sealing washer 14 of first insulating part in to switch on utmost point post 10 and top cap piece 13, make the battery form the short circuit or leak electricity, there is the potential safety hazard. In the application, the end of the insulating extension portion 110 abuts against the abutting surface 102 to completely coat the side surface of the pole 10, the sealing ring 14 seals a gap between the insulating extension portion 110 and the abutting surface 102, metal chips are not easy to pass through the space between the side surface of the pole 10 and the inner wall of the insulating extension portion 110 and then contact with the top cover plate 13 through the sealing ring 14, the creepage distance is long, and the safety is high.
Referring to fig. 3 and fig. 4, a sealing groove 132 may be formed at the bottom of the top cover plate 13, the sealing groove 132 is disposed around the bottom opening of the pole hole 131, and the sealing ring 14 is compressed in the sealing groove 132, so that the position of the sealing ring 14 is limited by the sealing groove 132 to ensure the effect of sealing the gap between the end of the extending portion and the abutting surface 102 of the sealing ring 14, and improve the reliability of the sealing structure.
Further, a hole of the second insulating member 12 through which the pole 10 passes is used as a second insulating hole 121, the periphery of the second insulating hole 121 is located in the sealing groove 132, the sealing ring 14 is located in a space defined by the bottom wall of the sealing groove 132, the outer side surface of the insulating extension portion 110, the inner wall of the second insulating hole 121 and the side surface of the abutting portion 101 close to the top end of the pole 10, in other words, the upper side of the sealing ring 14 is the bottom wall of the sealing groove 132, the lower side of the sealing ring 14 is the abutting surface 102, and the left side and the right side of the sealing ring 14 are the outer side surface of the end of the insulating extension portion 110 and the inner wall of the second insulating hole 121, so as to limit the position of the sealing ring 14, and the abutting surface 102 and the bottom wall of the sealing groove 132 are isolated by the peripheries of the sealing ring 14 and the second insulating hole 121.
Moreover, the periphery of the second insulating hole 121 may be recessed toward the top end of the terminal 10 to form a second insulating groove 122, and the abutting portion 101 is located in the second insulating groove 122 and abuts against the bottom wall of the second insulating groove 122, so that the position of the abutting portion 101 is limited by the second insulating groove 122, and the reliability of the riveting connection of the terminal 10 is improved. Moreover, the second insulating groove 122 disposed through the inner groove accommodates the abutting portion 101, so that the height of the pole 10 can be reduced, and the space occupied by the top cover structure 100 can be reduced.
Further, a first insulation groove 111 can be formed in the top of the first insulation member 11, the top cover structure 100 can further include a riveting member 15, the riveting member 15 is located in the first insulation groove 111, the pole 10 penetrates through the riveting member 15, and the top end of the pole 10 is pressed and riveted on the top of the riveting member 15, so that the position of the riveting member 15 is limited by the first insulation groove 111, and the reliability of the riveting connection of the pole 10 is further improved.
The embodiment of the utility model provides a top cap structure 100's theory of operation is:
this top cap structure 100 includes utmost point post 10, first insulating part 11, top cap piece 13 and second insulating part 12, wherein, the utmost point post hole 131 has been seted up on the top cap piece 13, first insulating part 11 and second insulating part 12 set up respectively in the top surface and the bottom surface of top cap piece 13, utmost point post 10 penetrates first insulating part 11, utmost point post hole 131 and second insulating part 12, and rivet in the top of first insulating part 11 and the bottom of second insulating part 12, and have insulating extension 110 on the first insulating part 11, this insulating extension 110 extends to utmost point post hole 131 in, and this insulating extension 110 is located between the side of utmost point post 10 and the inner wall of utmost point post hole 131. Thereby through insulating extension 110 isolated top cover piece 13 and utmost point post 10 side, even there is the metal fillings between insulating extension 110 and utmost point post 10 side, this metal fillings also are difficult for communicateing top cover piece 13 and utmost point post 10 side, and it makes the difficult short circuit that appears of top cover piece 13, the condition of electric leakage, its security is higher.
In summary, the following steps:
an embodiment of the utility model provides a top cap structure 100, it has the higher characteristics of security.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that the features in the above embodiments may be combined with each other without conflict, and various modifications and variations of the present invention are possible. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The present embodiments are to be considered as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A top cover structure is characterized by comprising a pole (10), a first insulating part (11), a top cover plate (13) and a second insulating part (12);
the top cover plate (13) is provided with a pole post hole (131), the first insulating part (11) and the second insulating part (12) are respectively arranged on the top surface and the bottom surface of the top cover plate (13), and the pole post (10) penetrates through the first insulating part (11), the pole post hole (131) and the second insulating part (12) and is riveted to the top of the first insulating part (11) and the bottom of the second insulating part (12);
the first insulating part (11) is provided with an insulating extension part (110), and the insulating extension part (110) extends into the pole column hole (131) and is positioned between the side surface of the pole column (10) and the inner wall of the pole column hole (131).
2. The top cover structure of claim 1, wherein the bottom end of the pole (10) is provided with a supporting portion (101), and the supporting portion (101) extends along the radial direction of the pole (10) and supports against the bottom of the second insulating member (12).
3. The roof structure of claim 2, characterized in that the end of the insulating extension (110) abuts against the side of the abutting portion (101) near the top of the pole (10).
4. Roof structure according to claim 2, characterized in that the insulating extension (110) is ring-shaped and is sleeved on the pole (10).
5. The top cover structure according to claim 4, wherein the top cover structure (100) further comprises a sealing ring (14), and the sealing ring (14) is sleeved on the insulating extension portion (110) and is located between the top cover sheet (13) and the side surface of the abutting portion (101) close to the top end of the pole (10).
6. The roof structure of claim 4, characterized in that the roof structure (100) further comprises a sealing ring (14), the sealing ring (14) is sleeved on the insulating extension portion (110) and is located between the second insulating member (12) and the side surface of the abutting portion (101) close to the top end of the pole (10).
7. The roof structure according to any of the claims 5-6, characterized in that the bottom of the top cover sheet (13) is opened with a sealing groove (132), the sealing groove (132) is arranged around the bottom opening of the pole column hole (131), and the sealing ring (14) is compressed in the sealing groove (132).
8. The roof structure according to claim 7, characterized in that the hole of the second insulating part (12) through which the pole (10) passes is a second insulating hole (121), and the periphery of the second insulating hole (121) is located in the sealing groove (132);
the sealing ring (14) is located in a space enclosed by the bottom wall of the sealing groove (132), the outer side face of the insulating extension part (110), the inner wall of the second insulating hole (121) and the side face, close to the top end of the pole (10), of the abutting part (101).
9. The roof structure according to any one of claims 2 to 6, characterized in that the hole of the second insulating member (12) through which the pole (10) passes is a second insulating hole (121), the outer circumference of the second insulating hole (121) is recessed toward the top end of the pole (10) to form a second insulating groove (122), and the abutting portion (101) is located in the second insulating groove (122) and abuts against the bottom wall of the second insulating groove (122).
10. A battery, characterized in that it comprises a top cover structure (100) according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023142970.5U CN213989022U (en) | 2020-12-22 | 2020-12-22 | Top cover structure and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023142970.5U CN213989022U (en) | 2020-12-22 | 2020-12-22 | Top cover structure and battery |
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| Publication Number | Publication Date |
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| CN213989022U true CN213989022U (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023142970.5U Active CN213989022U (en) | 2020-12-22 | 2020-12-22 | Top cover structure and battery |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839128A (en) * | 2021-09-23 | 2021-12-24 | 厦门海辰新能源科技有限公司 | A top cap subassembly, battery and energy memory for battery |
| CN115642352A (en) * | 2022-10-28 | 2023-01-24 | 楚能新能源股份有限公司 | Secondary battery, top cap assembly and assembling method thereof |
| WO2023098096A1 (en) * | 2021-11-30 | 2023-06-08 | 蜂巢能源科技股份有限公司 | Cover plate assembly and battery having same |
| US11721861B2 (en) | 2021-09-23 | 2023-08-08 | Xiamen Hithium Energy Storage Technology Co., Ltd. | Top cover assembly for battery, battery, and energy storage device |
| CN117712585A (en) * | 2024-02-01 | 2024-03-15 | 蜂巢能源科技股份有限公司 | Battery and battery pack |
| CN117728088A (en) * | 2024-02-08 | 2024-03-19 | 江苏天合储能有限公司 | Top cover assembly, battery cell, battery and assembly method of top cover assembly |
-
2020
- 2020-12-22 CN CN202023142970.5U patent/CN213989022U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839128A (en) * | 2021-09-23 | 2021-12-24 | 厦门海辰新能源科技有限公司 | A top cap subassembly, battery and energy memory for battery |
| CN113839128B (en) * | 2021-09-23 | 2023-01-24 | 厦门海辰储能科技股份有限公司 | A top cap subassembly, battery and energy memory for battery |
| US11721861B2 (en) | 2021-09-23 | 2023-08-08 | Xiamen Hithium Energy Storage Technology Co., Ltd. | Top cover assembly for battery, battery, and energy storage device |
| WO2023098096A1 (en) * | 2021-11-30 | 2023-06-08 | 蜂巢能源科技股份有限公司 | Cover plate assembly and battery having same |
| CN115642352A (en) * | 2022-10-28 | 2023-01-24 | 楚能新能源股份有限公司 | Secondary battery, top cap assembly and assembling method thereof |
| CN117712585A (en) * | 2024-02-01 | 2024-03-15 | 蜂巢能源科技股份有限公司 | Battery and battery pack |
| CN117712585B (en) * | 2024-02-01 | 2024-05-03 | 蜂巢能源科技股份有限公司 | Battery and battery pack |
| CN117728088A (en) * | 2024-02-08 | 2024-03-19 | 江苏天合储能有限公司 | Top cover assembly, battery cell, battery and assembly method of top cover assembly |
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