CN112713342B - Top cover, assembly method thereof and square-shell battery cell - Google Patents
Top cover, assembly method thereof and square-shell battery cell Download PDFInfo
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- CN112713342B CN112713342B CN202011638573.9A CN202011638573A CN112713342B CN 112713342 B CN112713342 B CN 112713342B CN 202011638573 A CN202011638573 A CN 202011638573A CN 112713342 B CN112713342 B CN 112713342B
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- mounting hole
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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
Abstract
The application relates to a top cover, an assembly method thereof and a square shell battery cell. The top cover includes: the cover plate is provided with a positive pole mounting hole, a negative pole mounting hole and an explosion-proof piece mounting hole; the positive pole and the negative pole are respectively arranged on the positive pole mounting hole and the negative pole mounting hole through a positive pole upper plastic sleeve and a negative pole upper plastic sleeve, and are higher than the upper surface of the cover plate by a preset height; the explosion-proof piece is arranged on the explosion-proof piece mounting hole; a lower plastic plate attached to the lower surface of the cap plate, having first and second through holes aligned with the positive and negative electrode post mounting holes, respectively, and a pressure relief channel aligned with the explosion-proof plate mounting hole; and the positive electrode rotating tab and the negative electrode rotating tab are respectively provided with a first protrusion and a second protrusion, and the first protrusion and the second protrusion respectively penetrate through the first through hole and the second through hole to be connected to the positive electrode column and the negative electrode column. The top cover has the advantages of simple structure, low cost, high assembly efficiency, small welding resistance and good stability.
Description
Technical Field
The application relates to the technical field of power batteries, in particular to a top cover, an assembly method thereof and a square shell battery cell.
Background
The current new energy market of lithium battery develops fast, and the lithium battery on the market mainly takes square shell battery core, cylindrical battery core and soft package battery core, wherein the market occupation of square shell battery core is the biggest, and square shell battery core structural strength is big, and group efficiency is high, and it is extremely advantaged as lithium ion battery core structural member. Square-shell cells are typically composed of a housing, a top cover, and a cell module. The traditional square shell battery cell mainly has the following problems:
1. the pole of the traditional square shell battery core is of a bolt structure, the structure is complex, the assembly efficiency of the group is low, and the contact resistance is large;
2. the traditional square shell battery core pole is poor in air tightness and durability, and the guarantee of the air tightness is important for the safety of the lithium ion battery;
3. the occupied space of the lower plastic and the adapter piece in the traditional top cover is large;
4. the pole of traditional top cap is higher, and occupation space is big, occupies the great space in mould top in the battery module assembly generally, causes the not high scheduling problem of module group efficiency.
Disclosure of Invention
The application aims to provide a top cover and a square shell battery cell which are simple in structure, low in cost and easy to assemble a module.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
according to an aspect of the present application, there is provided a top cap mounted on an upper end opening of a housing of a square-case cell, wherein the top cap includes:
the cover plate is provided with a positive pole mounting hole, a negative pole mounting hole and an explosion-proof piece mounting hole positioned between the positive pole mounting hole and the negative pole mounting hole;
the positive pole and the negative pole are respectively arranged on the positive pole mounting hole and the negative pole mounting hole through a plastic sleeve on the positive pole and a plastic sleeve on the negative pole and are higher than the upper surface of the cover plate by a preset height;
the explosion-proof piece is arranged on the explosion-proof piece mounting hole;
a lower plastic plate attached to a lower surface of the cap plate, having first and second through holes aligned with the positive and negative post mounting holes, respectively, and a pressure relief channel aligned with the explosion-proof plate mounting hole;
and the positive electrode transfer sheet and the negative electrode transfer sheet are respectively provided with a first protrusion and a second protrusion, and the first protrusion and the second protrusion respectively penetrate through the first through hole and the second through hole to be connected with the positive electrode column and the negative electrode column.
In a preferred embodiment, the cover plate is a sheet of aluminum, which is formed by stamping.
In a preferred embodiment, the positive and negative post mounting holes are counter bores.
In a preferred embodiment, the lower plastic plate is sized to fit within the upper opening.
In a preferred embodiment, a plurality of positioning columns are formed on the upper surface of the lower plastic plate, a plurality of blind holes corresponding to the positioning columns one by one are formed on the lower surface of the cover plate, the positioning columns are jointed in the blind holes, and the peripheral edges of the first through holes and the second through holes are upwards protruded and respectively jointed on the hole walls of the positive pole column mounting holes and the negative pole column mounting holes.
In a preferred embodiment, the lower plastic plate is integrally preformed from plastic.
In a preferred embodiment, the plastic sleeve on the positive electrode and the plastic sleeve on the negative electrode are formed on the positive electrode post and the negative electrode post through injection molding.
In a preferred embodiment, the positive electrode post and the negative electrode post are made of aluminum, copper or copper-aluminum alloy.
In a preferred embodiment, the positive electrode tab and the negative electrode tab are made by friction welding or explosion welding.
In a preferred embodiment, the predetermined height is 2-5 mm.
In a preferred embodiment, the positive electrode tab and the negative electrode tab each include a U-shaped cap plate and a connection portion extending from a bottom of the U-shaped cap plate in a direction away from both arms, and the first protrusion and the second protrusion are formed on an upper surface of the connection portion.
In a preferred embodiment, the first protrusion and the second protrusion are in a round buckle shape, and the bottom ends of the positive electrode post and the negative electrode post are provided with elastic buckling holes, so that the first protrusion and the second protrusion are detachably buckled at the bottom ends of the positive electrode post and the negative electrode post.
In a preferred embodiment, the explosion-proof sheet mounting hole is a runway-shaped hole, and a protective film is stuck to the upper end of the explosion-proof sheet mounting hole.
According to another aspect of the present application, there is also provided a square-case cell including a case having an upper end opening from which the cell module is loaded into the case, a cell module, and a top cover closing the upper end opening, wherein the top cover is the top cover as described above.
According to still another aspect of the present application, there is also provided a top cover assembly method, wherein the top cover is the top cover as described above, the assembly method comprising the steps of:
s1, after the explosion-proof sheet is installed in the explosion-proof sheet installation hole of the cover plate, attaching the cover plate and the lower plastic plate together;
s2, respectively mounting the positive pole and the negative pole on a positive pole mounting hole and a negative pole mounting hole of the cover plate;
s3, mounting the positive electrode switching piece and the negative electrode switching piece together with the positive electrode post and the negative electrode post;
s4, placing the assembly formed after the step S3 in an integral injection molding cavity of a mold;
s5, injection molding to obtain an anode plastic sleeve and a cathode plastic sleeve which are formed on the anode post and the cathode post, and assembling the top cover.
By adopting the technical proposal, the application has the beneficial effects that,
1. the square shell battery cell has the advantages of simple structure, low cost, high assembly efficiency, small welding resistance and good stability;
2. the pole of the square shell battery core has good air tightness and long lasting time;
3. the internal space of the battery cell is large, and the energy density of the battery cell is high;
4. the square shell battery core pole column part occupies small height, which is beneficial to improving the utilization rate of the internal space of the module and the whole energy density.
Drawings
Fig. 1 is a perspective view of the top cover of the present application.
FIG. 2 is an exploded view of the top cover shown in FIG. 1;
FIG. 3 is a top view of the top cover shown in FIG. 1;
FIG. 4 is a cross-sectional view of the top cover taken along line A-A in FIG. 3;
FIG. 5 is a bottom perspective view of the cover plate of the overcap shown in FIG. 2;
FIG. 6 is a bottom perspective view of the lower plastic panel of the top cover shown in FIG. 2;
fig. 7 is a perspective view of a square-case cell of the present application;
fig. 8 is an exploded view of the square-case cell shown in fig. 7.
Detailed Description
The preferred embodiments of the present application will be described in detail below with reference to the attached drawings so that the objects, features and advantages of the present application will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the application, but rather are merely illustrative of the true spirit of the application.
In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising" will be understood to be open-ended, meaning of inclusion, i.e. to be interpreted to mean "including, but not limited to.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.
In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present application, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.
Referring to fig. 1, 2, 7 and 8, wherein fig. 1 and 7 are perspective views of a square-case cell 100 and a top cover 1 thereof according to an embodiment of the present application, and fig. 2 and 8 are exploded views of the square-case cell 100 and the top cover 1 thereof. The top cap 1 is mounted on the upper end opening 21 of the housing 2 of the square-case cell 100. The top cover 1 may include a cover plate 11, a positive electrode post 12, a negative electrode post 13, a positive electrode upper plastic sleeve 14, a negative electrode upper plastic sleeve 15, a bursting disc 16, a lower plastic plate 17, a positive electrode transfer tab 18, a negative electrode transfer tab 19, and the like. The cover plate 11 is a photo-aluminum sheet, which may be formed by punching. The dimensions of the cover plate 11 can be designed according to the specifications of the square-shell battery cell. The cover plate 11 is provided with a positive electrode column mounting hole 111, a negative electrode column mounting hole 112, and an explosion-proof sheet mounting hole 113 located between the positive electrode column mounting hole 111 and the negative electrode column mounting hole 112. The positive electrode post mounting hole 111, the negative electrode post mounting hole 112, and the explosion-proof plate mounting hole 113 may be formed by machining. In the illustrated embodiment, the positive and negative electrode post mounting holes 111, 112 are counter bored, i.e., an upper portion having a larger aperture and a lower portion having a smaller aperture.
The positive electrode post 12 and the negative electrode post 13 are mounted on the positive electrode post mounting hole 111 and the negative electrode post mounting hole 112 through the positive electrode upper plastic sleeve 14 and the negative electrode upper plastic sleeve 15, respectively, and are raised above the upper surface of the cap plate 11 by a predetermined height. The predetermined height is generally small, i.e., the positive and negative electrode posts 12, 13 are much lower than the existing posts, which can increase the battery body space and increase the cell energy density. Preferably, the predetermined height is 2 to 5mm. More preferably, the predetermined height is about 3 mm. Positive electrode tab 12 and negative electrode tab 13 are typically made of a good metal conductor. Preferably, the positive electrode post 12 and the negative electrode post 13 may be aluminum, copper-aluminum, or the like. Preferably, the negative electrode post 13 may be manufactured by friction welding or explosion welding.
The positive electrode plastic sleeve 14 and the negative electrode plastic sleeve 15 are formed on the positive electrode post 12 and the negative electrode post 13 by injection molding. It should be understood that the plastic casing 14 on the positive electrode and the plastic casing 15 on the negative electrode may be prefabricated and then sleeved on the positive electrode post 12 and the negative electrode post 13 to protect the posts and insulate them from the cover plate 11. The positive electrode post 12 and the negative electrode post 13 are slightly higher than the positive electrode plastic sleeve 14 and the negative electrode plastic sleeve 15 (for example, 0.5 mm) to facilitate connection to the outside.
As shown in fig. 1, 2 and 5, the rupture disk 16 is mounted on the rupture disk mounting hole 113. In the illustrated embodiment, the upper portion of the rupture disc mounting hole 113 is higher than the upper surface of the cover plate 11 and has a smaller diameter than the lower portion, i.e., the rupture disc mounting hole 113 is a counterbore as seen from the lower surface of the cover plate 11. That is, the rupture disk 16 is embedded in the lower surface of the cover plate 11. In order to protect the rupture disk 16, a protective film 160 is attached to the upper end of the rupture disk mounting hole 113. Rupture disc 16 ruptures when the pressure within square-case cell 100 is greater than a threshold (e.g., 0.6 MPa) to avoid explosion of square-case cell 100. The construction of the rupture disk 16 is well known and will not be described herein. The rupture disc mounting hole 113 is designed according to the shape of the rupture disc 16. In the illustrated embodiment, the rupture disc mounting hole 113 is a racetrack shaped hole.
As shown in fig. 1-6, a lower plastic plate 17 is attached to the lower surface of the cover plate 11. Specifically, a plurality of positioning posts 174 (two rows are shown, 6 each) are formed on the upper surface of the lower plastic plate 17, and accordingly, a plurality of blind holes 114 are provided on the lower surface of the cover plate 11 in one-to-one correspondence with the positioning posts 174, and the lower plastic plate 17 is attached to the lower surface of the cover plate 11 by engagement of the positioning posts 174 in the blind holes 114. The diameter of the positioning post 174 may be slightly larger than the blind bore 114 to achieve an interference fit securement. The lower plastic plate 17 has a size corresponding to that of the upper end opening 21 of the housing 2 and smaller than that of the cover plate 11 so that the lower plastic plate 17 can be embedded in the housing 2, thereby realizing the mounting of the top cover 1 on the housing 2. The lower plastic plate 17 has first and second through holes 171 and 172 aligned with the positive and negative post mounting holes 111 and 112, respectively, and a pressure relief channel 173 aligned with the rupture disc mounting hole 113. Wherein the peripheral edges of the first through hole 171 and the second through hole 172 protrude upward and are engaged on the hole walls of the positive electrode post mounting hole 111 and the negative electrode post mounting hole 112, respectively, to insulate the positive electrode tab 18 and the negative electrode tab 19 from the cap plate 11. The pressure relief channel 173 is a rectangular groove, and a plurality of rows of through holes 1731 are formed at the bottom of the groove. Rectangular support portions 174, each having rectangular grooves with upward openings, extend downward from both ends and the middle of the lower plastic plate 17. The middle rectangular supporting part is a pressure relief channel 173.
The positive electrode tab 18 and the negative electrode tab 19 have the same shape and structure. In the present embodiment, the positive electrode tab 18 and the negative electrode tab 19 each include a U-shaped cover plate 181, 191 and connection portions 182, 192 extending from the bottom of the U-shaped cover plate 181, 191 in a direction away from the two arms. Wherein, the upper surfaces of the connecting parts 182, 192 are respectively provided with a first protrusion 183 and a second protrusion 193, and the first protrusion 183 and the second protrusion 193 respectively penetrate through the first through hole 171 and the second through hole 172 of the lower plastic plate 17 to be connected to the positive electrode post 12 and the negative electrode post 13.
In the present embodiment, the first protrusion 183 and the second protrusion 193 are rounded, and the bottom ends of the positive electrode column 12 and the negative electrode column 13 are provided with elastic snap holes. The first and second protrusions 183 and 193 are thus detachably fastened to the bottom ends of the Yu Zhengji and negative posts, so that the positive and negative tabs 18 and 19 are fixedly connected to the positive and negative posts 12 and 13, respectively.
As shown in fig. 7 and 8, a square-case cell 100 includes a case 2, a cell module 3, and a top cover 1, wherein the case 2 has an upper end opening 21, the cell module 3 is fitted into the case 2 from the upper end opening 21, and the top cover 1 closes the upper end opening 21. The housing 2 is typically drawn from an aluminum plate. The structure of the cell module 3 is well known and will not be described here. The structure of the top cover 1 has been described above and will not be described again here.
Furthermore, in the embodiment of the present application, there is also provided a method of assembling the top cover 1 as described above. The assembly method may include the steps of:
s1, after the explosion proof piece 16 is installed in the explosion proof piece installation hole 113 of the cover plate 11, the cover plate 11 and the lower plastic plate 17 are attached together, specifically by engaging the positioning posts 174 in the blind holes 114 of the lower surface of the cover plate 11;
s2, respectively mounting the positive pole 12 and the negative pole 13 on a positive pole mounting hole 111 and a negative pole mounting hole 112 of the cover plate 11;
s3, mounting the positive electrode rotating tab 18 and the negative electrode rotating tab 19 together with the positive electrode post 12 and the negative electrode post 13, specifically, connecting the first protrusion 183 and the second protrusion 193 to the bottom ends of the positive electrode post 12 and the negative electrode post 13 through the first through hole 171 and the second through hole 172 of the lower plastic plate 17 respectively;
s4, placing the assembly formed after the step S3 in an integral injection molding cavity of a mold;
s5, injection molding to obtain an anode plastic sleeve 14 and a cathode plastic sleeve 15 which are formed on the anode post 12 and the cathode post 13, and assembling the top cover 1. The whole assembly process can be completed through an automatic assembly production line, and the assembly efficiency is high.
While the preferred embodiments of the present application have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the application. Such equivalents are also intended to fall within the scope of the application as defined by the following claims.
Claims (13)
1. A cap assembly method, the cap being mounted on an upper end opening of a housing of a square-case cell and comprising:
the cover plate is provided with a positive pole mounting hole, a negative pole mounting hole and an explosion-proof piece mounting hole positioned between the positive pole mounting hole and the negative pole mounting hole;
the positive pole and the negative pole are respectively arranged on the positive pole mounting hole and the negative pole mounting hole through a plastic sleeve on the positive pole and a plastic sleeve on the negative pole and are higher than the upper surface of the cover plate by a preset height;
the explosion-proof piece is arranged on the explosion-proof piece mounting hole;
a lower plastic plate attached to a lower surface of the cap plate, having first and second through holes aligned with the positive and negative post mounting holes, respectively, and a pressure relief channel aligned with the explosion-proof plate mounting hole;
the positive electrode transfer piece and the negative electrode transfer piece are respectively provided with a first protrusion and a second protrusion, and the first protrusion and the second protrusion respectively penetrate through the first through hole and the second through hole to be connected with the positive electrode column and the negative electrode column;
the first protrusion and the second protrusion are in a round buckle shape, and elastic buckling holes are formed in the bottom ends of the positive pole and the negative pole, so that the first protrusion and the second protrusion are detachably buckled on the bottom ends of the positive pole and the negative pole;
the method for assembling the top cover is characterized by comprising the following steps of:
s1, after the explosion-proof sheet is installed in the explosion-proof sheet installation hole of the cover plate, attaching the cover plate and the lower plastic plate together;
s2, respectively mounting the positive pole and the negative pole on a positive pole mounting hole and a negative pole mounting hole of the cover plate and protruding the upper surface of the cover plate by a preset height;
s3, the positive electrode transfer sheet and the negative electrode transfer sheet are buckled with the positive electrode column and the negative electrode column, wherein circular buckling-shaped first protrusions and circular buckling-shaped second protrusions are respectively arranged on the positive electrode transfer sheet and the negative electrode transfer sheet, and elastic buckling holes are formed in the bottom ends of the positive electrode column and the negative electrode column;
s4, placing the assembly formed after the step S3 in an integral injection molding cavity of a mold;
s5, injection molding is carried out, so that the plastic sleeve on the positive electrode and the plastic sleeve on the negative electrode are formed on the positive electrode post and the negative electrode post, and the assembly of the top cover is completed.
2. The method of assembling a top cover according to claim 1, wherein the cover plate is a photo-aluminum sheet, which is formed by punching.
3. The method of assembling a top cap of claim 1, wherein the positive post mounting hole and the negative post mounting hole are counter bores.
4. The method of assembling a top cover of claim 1, wherein said lower plastic panel is sized to fit within said upper opening.
5. The top cover assembling method according to claim 1, wherein a plurality of positioning posts are formed on the upper surface of the lower plastic plate, a plurality of blind holes corresponding to the positioning posts one by one are formed on the lower surface of the cover plate, the positioning posts are engaged in the blind holes, and peripheral edges of the first through holes and the second through holes are protruded upward and engaged on hole walls of the positive electrode post mounting holes and the negative electrode post mounting holes, respectively.
6. The method of assembling a top cover according to claim 4 or 5, wherein the lower plastic plate is integrally preformed from plastic.
7. The cap assembly method of claim 1, wherein the positive and negative posts are made of aluminum, copper, or copper-aluminum alloy.
8. The top cap assembly method of claim 1, wherein the negative electrode post is made by friction welding or explosion welding.
9. The roof assembly method of claim 1, wherein the predetermined height is 2-5 mm.
10. The top cover assembling method according to claim 1, wherein the positive electrode tab and the negative electrode tab each include a U-shaped cover plate and a connecting portion extending from a bottom of the U-shaped cover plate in a direction away from both arms, and the first protrusion and the second protrusion are formed on an upper surface of the connecting portion.
11. The roof assembly method of claim 1, wherein the explosion-proof plate mounting hole is a race track hole and a protective film is attached to an upper end thereof.
12. A top cover made by the top cover assembly method of any one of claims 1-11.
13. A square-case cell comprising a housing having an upper opening, a cell module mounted into the housing from the upper opening, and a top cover closing the upper opening, wherein the top cover is the top cover of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011638573.9A CN112713342B (en) | 2020-12-31 | 2020-12-31 | Top cover, assembly method thereof and square-shell battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011638573.9A CN112713342B (en) | 2020-12-31 | 2020-12-31 | Top cover, assembly method thereof and square-shell battery cell |
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| Publication Number | Publication Date |
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| CN112713342A CN112713342A (en) | 2021-04-27 |
| CN112713342B true CN112713342B (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011638573.9A Active CN112713342B (en) | 2020-12-31 | 2020-12-31 | Top cover, assembly method thereof and square-shell battery cell |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115347288A (en) * | 2021-05-13 | 2022-11-15 | 荣盛盟固利新能源科技有限公司 | Battery cover plate and power battery |
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| CN208622794U (en) * | 2018-08-01 | 2019-03-19 | 宁德时代新能源科技股份有限公司 | Secondary cell and its cap assembly |
| CN109659453A (en) * | 2017-10-10 | 2019-04-19 | 宁德时代新能源科技股份有限公司 | Secondary cell's top cap subassembly and secondary cell |
| CN209496906U (en) * | 2019-04-01 | 2019-10-15 | 宁德时代新能源科技股份有限公司 | Cap assembly and secondary cell |
| CN110635073A (en) * | 2019-10-23 | 2019-12-31 | 江西赣锋电池科技有限公司 | Power battery top cover and manufacturing method thereof |
| CN211629143U (en) * | 2020-01-14 | 2020-10-02 | 靖江市东达新能源科技有限公司 | Power battery top cover plate assembly |
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2020
- 2020-12-31 CN CN202011638573.9A patent/CN112713342B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659453A (en) * | 2017-10-10 | 2019-04-19 | 宁德时代新能源科技股份有限公司 | Secondary cell's top cap subassembly and secondary cell |
| CN208622794U (en) * | 2018-08-01 | 2019-03-19 | 宁德时代新能源科技股份有限公司 | Secondary cell and its cap assembly |
| CN209496906U (en) * | 2019-04-01 | 2019-10-15 | 宁德时代新能源科技股份有限公司 | Cap assembly and secondary cell |
| CN110635073A (en) * | 2019-10-23 | 2019-12-31 | 江西赣锋电池科技有限公司 | Power battery top cover and manufacturing method thereof |
| CN211629143U (en) * | 2020-01-14 | 2020-10-02 | 靖江市东达新能源科技有限公司 | Power battery top cover plate assembly |
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