CN210805936U - Single battery and power battery pack - Google Patents
Single battery and power battery pack Download PDFInfo
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- CN210805936U CN210805936U CN201922102729.0U CN201922102729U CN210805936U CN 210805936 U CN210805936 U CN 210805936U CN 201922102729 U CN201922102729 U CN 201922102729U CN 210805936 U CN210805936 U CN 210805936U
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- screening glass
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a battery cell and power battery group, including taking electric core, switching piece and the screening glass of utmost point ear, switching piece, utmost point ear and screening glass range upon range of welded connection in proper order, utmost point ear buckle and half surround the screening glass, and the screening glass is the fifty percent discount structure, and a side of screening glass is provided with the fillet of buckling, and one side of screening glass be provided with the part of buckling towards utmost point ear in the fillet of buckling. The utility model discloses a take the electric core of utmost point ear, switching piece and screening glass, through designing into the screening glass fifty percent discount structure, a side of screening glass is provided with the fillet of buckling, with the switching piece, utmost point ear and screening glass range upon range of welded connection in proper order, utmost point ear later semi-surrounding screening glass of buckling, one side that the screening glass is provided with the fillet of buckling is towards the part of buckling of utmost point ear, thereby the edge of screening glass can not cause the damage to utmost point ear for buckling the fillet, on the other hand, the screening glass is the fifty percent discount structure, processing is simple, can effectively reduce manufacturing cost, screening glass thickness after the fifty percent.
Description
Technical Field
The utility model relates to an electric power tech field especially relates to a battery cell and power battery group.
Background
With the vigorous development of the new energy industry and the further popularization of new energy electric vehicles, the requirements on the safety performance of the power battery cell are more emphasized. On the other hand, along with subsidy and grade withdrawal in the new energy industry, the power battery cell also faces urgent needs of quality improvement and cost reduction.
In the existing large-size power battery cell, the number of layers of a current collector is increased along with the increase of the thickness of the battery cell, and the number of layers of a lug is increased according to the demand of improving the current carrying capacity; the power battery cell is connected with the top cover pole terminal and the naked battery cell pole lug through the switching piece. The electrode lug and the adapter plate are connected and fixed through ultrasonic welding, and the electrode lug is easy to puncture due to the fact that the number of layers of the electrode lug is large and the ultrasonic welding power is correspondingly large. Currently, a single-layer copper-aluminum foil is adopted as a gasket and is cushioned between a tab and an ultrasonic welding head so as to avoid piercing the tab. But individual layer copper aluminium foil edge is sharp-pointed, and has the edge burr that forms during the five metals punching press, damages utmost point ear easily, and just naked electric core needs to buckle along the screening glass edge after the super welding, and utmost point ear is cut easily to sharp-pointed edge.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple and effectual battery cell of welding of production simple process and power battery group.
In order to realize the purpose, the utility model adopts the following technical scheme:
the utility model provides a single battery, is including taking electric core, switching piece and the screening glass of utmost point ear, the switching piece utmost point ear with screening glass range upon range of welded connection in proper order, utmost point ear is buckled and is partly surrounded the screening glass, the screening glass is fifty percent discount structure, a side of screening glass is provided with the fillet of buckling, just the screening glass be provided with one side orientation at the fillet of buckling the part of buckling of utmost point ear.
Further, one side of the protection sheet, which is far away from the bending fillet, is provided with an anti-reflection structure.
Further, prevent the anti-structure set up in the one corner of protection sheet, just prevent that the anti-structure is the chamfer structure.
Further, the protective sheet is manufactured by adopting a process of folding at least twice.
Further, the adapter plate, the tab and the protective plate are connected through ultrasonic welding.
Further, the single battery further comprises an insulating sheet, and the insulating sheet is arranged between the protection sheet and the lug close to the battery cell area.
The battery top cover comprises a top cover plate, a first pole column unit and a second pole column unit, wherein the first pole column unit and the second pole column unit are arranged on the top cover plate and are respectively connected with the adapter plate.
Further, the tab comprises a first tab and a second tab which are led out from the battery cell, the first tab is electrically connected with the first battery cell current collector, and the second tab is electrically connected with the second battery cell current collector.
Further, the first tab and the first battery cell current collector are of an integrated structure, and the second tab and the second battery cell current collector are of an integrated structure.
In order to solve the technical problem, the utility model provides a power battery group is still provided, power battery group is including converging piece and a plurality of battery cell as above-mentioned, converge piece and a plurality of battery cell electric connection.
The utility model discloses beneficial effect does: the single battery is including taking the electric core of utmost point ear, switching piece and screening glass, through designing into the fifty percent discount structure with the screening glass, a side of screening glass is provided with the fillet of buckling, with the switching piece, utmost point ear and screening glass stack-up welded connection in proper order, utmost point ear post-bending surrounds the screening glass, one side of screening glass that is provided with the fillet of buckling is towards the part of buckling of utmost point ear, thereby the edge of screening glass can not cause the damage to utmost point ear for buckling the fillet, on the other hand, the screening glass is the fifty percent discount structure, processing is simple, can effectively reduce manufacturing cost, and screening glass thickness after the fifty.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the previous developments of the present invention, the drawings used in the embodiments or the previous developments will be briefly described below, and it is obvious that the drawings in the following descriptions are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic sectional view of a protective sheet according to an embodiment of the present invention;
FIG. 2 is an enlarged view of part A of FIG. 1;
FIG. 3 is a schematic structural view illustrating a bending process of a protective sheet according to an embodiment of the present invention;
FIG. 4 is a schematic view of a protective sheet according to an embodiment of the present invention;
FIG. 5 is a schematic front view of a protective sheet according to an embodiment of the present invention;
fig. 6 is an assembly diagram of the battery cell, the interposer and the protection sheet according to an embodiment of the present invention;
fig. 7 is an assembly diagram of an electric core, an adapter sheet and a protection sheet according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a power battery pack according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a process of folding two sides of a foil gasket toward the middle in an earlier development;
fig. 10 is a structural diagram of the result of folding two sides of the foil gasket toward the middle in the previous development.
Wherein: 1. an electric core; 2. a patch; 3. a protective sheet; 4. an anti-inversion structure; 5. a battery case; 6. a battery top cover; 7. a tab; 8. a confluence sheet; 11. a first tab; 12. a second tab; 13. a bending part; 21. a first transfer tab; 22. a second patch; 61. riveting a block; 62. a negative electrode post; 63. plastic is coated; 64. plastic is discharged; 65. a seal ring; 66. a top flap.
Detailed Description
The description in the present application relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated.
As shown in fig. 1-7, a single battery comprises an electric core 1 with a tab 7, an adapter sheet 2 and a protection sheet 3, wherein the adapter sheet 2, the tab 7 and the protection sheet 3 are sequentially connected in a stacking and welding manner, the tab 7 is bent to be half surrounded by the protection sheet 3, the protection sheet 3 is of a folding structure, one side edge of the protection sheet 3 is provided with a bending fillet, and one side of the protection sheet 3, which is provided with the bending fillet, faces towards the bending part 13 of the tab 7.
In some embodiments, as shown in fig. 2, the tab 7 surrounds the protection sheet 3 after being bent, the protection sheet 3 is a folded structure, for example, the protection sheet 3 is made of foil, the foil can be folded along a central line to form the protection sheet 3, the thickness of the foil is 0.01 to 1mm, for improving the welding effect, the thickness of the foil can also be designed to be 0.05 to 0.3mm, one side of the protection sheet 3 is provided with a bending fillet, and the adapter sheet 2, the tab 7 and the protection sheet 3 are sequentially welded in a stacked manner.
In earlier stage research and development, in order to prevent to puncture utmost point ear 7, adopt the individual layer copper aluminium foil to act as the gasket usually, fill up between utmost point ear 7 and ultrasonic bonding tool, but individual layer copper aluminium foil edge is sharp-pointed, and the edge burr that forms when having the five metals punching press, easily damage utmost point ear 7, in addition, naked electric core need follow the bending of gasket edge after the super welding, utmost point ear 7 is cut easily at the sharp-pointed edge of gasket, in order to avoid the damage of gasket to utmost point ear 7, can be through the middle fifty percent discount of both sides with the foil material gasket, please refer to figure 9 and 10, figure 9 is the process structure sketch map of fifty percent discount of the middle of both sides of foil material gasket in earlier stage research and development, figure 10 is the result structure sketch map of fifty percent discount of the middle of both sides of foil material gasket in earlier stage research and development, natural shaping. However, the process of folding the gasket on two sides is complex, the production cost is high, and on the other hand, when the two bent sides are inclined, a large seam is formed in the middle, so that the thickness difference of the gasket is large, and the welding effect is poor.
The utility model discloses when implementing, the switching piece 2, utmost point ear 7 and screening glass 3 pass through ultrasonic bonding and connect, when welding switching piece 2 and utmost point ear 7, fill up screening glass 3 between utmost point ear 7 and ultrasonic bonding tool, thereby puncture utmost point ear 7 when avoiding welding, need buckle utmost point ear 7 along screening glass 3 edges after the welding is accomplished, screening glass 3's one side of being provided with the fillet of buckling is towards utmost point ear 7 bending part 13 this moment, the fillet of buckling is mellow and not sharp-pointed, can not cut off utmost point ear 7, form effective protection to utmost point ear 7, on the other hand, screening glass 3 adopts the fifty percent discount structure, the fifty percent discount simple process, and is with low costs, on the one hand again, screening glass 3 thickness after the fifty percent discount is even unanimous, the welding is effectual.
This embodiment is through designing into the fifty percent discount structure with screening glass 3, a side of screening glass 3 is provided with the fillet of buckling, with switching piece 2, utmost point ear 7 and screening glass 3 range upon range of welded connection in proper order, utmost point ear 7 surrounds screening glass 3 after buckling, screening glass 3 is provided with one side of the fillet of buckling towards the part 13 of buckling of utmost point ear 7, thereby the edge of screening glass 3 can not lead to the fact the damage to utmost point ear 7 for buckling the fillet, on the other hand, screening glass 3 is the fifty percent discount structure, processing is simple, can effectively reduce manufacturing cost, 3 even thickness of screening glass after the fifty percent discount moreover, can effectively.
In some embodiments, as shown in fig. 3, 4 and 5, the side of the protective sheet 3 remote from the bend fillet is provided with an anti-inversion structure 4. When implementing, prevent anti-structure 4 set up in the one corner department of keeping away from a bend fillet side of screening glass 3, just prevent that anti-structure 4 is the chamfer structure, the utility model discloses battery cell still include battery housing 5 and install in battery top cap 6 on the battery housing 5, wherein, the electrolyte has been filled in battery housing 5, and electric core 1 is acceptd in battery housing 5, and screening glass 3 can carry out die-cut plastic after folding, will form the burr structure along die-cut direction, and the burr structure will puncture utmost point ear 7 in the welding process if towards 6 directions of battery top cap, the utility model discloses a prevent anti-structure 4 of screening glass 3 can guarantee that the burr is towards electric core 1 direction to avoid the burr to puncture utmost point ear 7 in the welding process.
In some optional embodiments, the single battery further comprises an insulation sheet disposed between the protection sheet 3 and the tab 7 near the area of the battery cell 1. Switching piece 2, utmost point ear 7 and screening glass 3 range upon range of welded connection back in proper order, later semi-surrounding screening glass 3 that buckles utmost point ear 7, screening glass 3 sets up in the semi-surrounding structure that utmost point ear 7 buckled and forms this moment, through setting up the insulating piece in screening glass 3 with be close to between the utmost point ear 7 in electric core 1 region, screening glass 3 forms burr structure orientation insulating piece along die-cut direction promptly to avoid the burr structure to stab utmost point ear 7 on electric core 1 this side, protect utmost point ear 7.
In some optional embodiments, the protection sheet 3 is manufactured by a process of folding at least twice, the folding structure of the protection sheet 3 can be manufactured by folding for multiple times (for example, 2 times or 3 times), and the thickness of the protection sheet 3 formed by folding for multiple times is uniform and consistent, so that the welding effect can be effectively ensured.
In some optional embodiments, the utility model discloses single cell still includes battery housing 5, electrolyte, battery top cap 6, electrolyte pour in battery housing 5 single cell's electric core 1 accept in battery housing 5, battery top cap 6 install in on the battery housing 5, battery top cap 6 include top cap piece 66 and set up in first utmost point post unit and second utmost point post unit on the top cap piece 66, first utmost point post unit with second utmost point post unit respectively with switching piece 2 is connected.
When implementing, fill electrolyte and hold electric core 1 in battery case 5, half encirclement screening glass 3 after the utmost point ear 7 of electric core 1 buckles, screening glass 3 is fifty percent discount structure, and 3 a side edges of screening glass are provided with the fillet of buckling, switching piece 2, utmost point ear 7 and screening glass 3 range upon range of welding in proper order, utmost point ear 7 buckles along 3 edges of screening glass after the welding is accomplished, one side that screening glass 3 was provided with the fillet of buckling is towards utmost point ear 7 bending part 13, the fillet of buckling is mellow and not sharp-pointed, can not cut wound utmost point ear 7, utmost point ear 7 forms effective protection. Wherein, battery top cap 6 is installed on battery case 5, and battery top cap 6 includes top cap piece 66 and set up in first utmost point post unit and second utmost point post unit, explosion-proof valve structure, notes liquid hole structure and lower insulating part on the top cap piece 66. A plurality of (for example, 2, 3 or 5) battery cells 1 can be accommodated in the battery case 5, the battery top cover 6 is fixedly mounted on the battery case 5, the tab 7 led out from the battery cell 1 is connected with the adapter sheet 2, the adapter sheet 2 is connected with the battery top cover 6, in the implementation, the battery top cover 6 is further provided with a riveting block 61 and an electrode pole column, wherein, the electrode post includes anodal utmost point post and negative pole post, as shown in fig. 1, use negative pole post 62 as an example, switching piece 2 and negative pole post 62 electric connection, negative pole post 62 and riveting piece 61 electric connection, battery top cover 6 is provided with the pilot hole, riveting piece 61 installation sets up in this pilot hole, riveting piece 61 can be installed fixedly through plastic 63 on the negative pole, negative pole post 62 can be installed fixedly through plastic 64 under the negative pole, thereby plastic 63 and riveting piece 61 and pilot hole interference fit prevent that riveting piece 61 from falling out and sealing on the negative pole. In addition, a sealing ring 65 is further included, the sealing ring 65 is disposed between the negative electrode post 62 and the battery top cover 6, so as to seal the inside of the battery case 5, prevent the electrolyte in the battery case 5 from leaking, and prevent external impurities, such as dust, from entering the battery case 5, and in one embodiment, the sealing ring 65 may be fixed in an insulating manner by using an insulating sealing ring.
In some embodiments, the tabs 7 include a first tab 11 and a second tab 12 led out from the battery cell 1, where the first tab 11 is electrically connected to the first current collector of the battery cell 1, and the second tab 12 is electrically connected to the second current collector of the battery cell 1. The first tab 11 and the first current collector of the battery cell 1 are of an integrated structure, and the second tab 12 and the second current collector of the battery cell are of an integrated structure.
In implementation, the adaptor sheet 2 includes a pole connection area and a tab 7 connection area, wherein the pole connection area is connected to a pole terminal in the battery top cover 6, and the tab 7 connection area is connected to a tab 7 of the battery core 1, taking as an example that the adaptor sheet 2 includes a first adaptor sheet 21 and a second adaptor sheet 22 for connecting the battery core 1 and the battery top cover 6, wherein the first adaptor sheet 21 includes a first pole connection area, a first tab 7 connection area and a first conductive transition area, the second adaptor sheet 22 includes a second pole connection area, a second tab 7 connection area and a second conductive transition area, the first tab 711 of the battery core 1 is connected to the first tab 7 connection area of the first adaptor sheet 21 by ultrasonic welding, the second tab 12 of the battery core 1 is connected to the second tab 7 connection area of the second adaptor sheet 22 by ultrasonic welding, because the ultrasonic welding head easily punctures the tab 7, the protection sheet 3 can be added as a gasket, screening glass 3 is through toward one side buckling with the individual layer foil, at the unilateral fillet of buckling that forms, later cut the appearance to it again, and set up and prevent reverse structure 4, one side that has the fillet of buckling all the time when guaranteeing to use is to the utmost point ear 7 one side of buckling of electric core 1, and the utmost point ear 7 forms effective protection, and it is simpler to roll over the shaping mode, and 3 even unanimities of thickness of screening glass after the shaping, and the ultrasonic bonding effect is better, and is difficult to produce the metal fillings during ultrasonic bonding. Meanwhile, the material cost is lower.
In some optional embodiments, referring to fig. 8, the present invention further provides a power battery pack, which includes a bus bar 8 and a plurality of single batteries as described above, wherein the bus bar 8 is electrically connected to the plurality of single batteries. When the power battery pack is implemented, the confluence sheet 8 in the power battery pack is electrically connected with the riveting blocks 61 of the single batteries, the riveting blocks 61 of the single batteries corresponding to the positive pole posts are connected through the confluence sheet, and the riveting blocks 61 of the single batteries corresponding to the negative pole posts are connected through the confluence sheet, so that the assembly of the battery pack is realized. Wherein, electric core 1 is provided with utmost point ear 7, switching piece 2, utmost point ear 7 and screening glass 3 range upon range of welded connection in proper order, utmost point ear 7 buckles and partly surrounds screening glass 3, screening glass 3 is the fifty percent discount structure, a side of screening glass 3 is provided with the fillet of buckling, and one side of screening glass 3 that is provided with the fillet of buckling is towards the bending part 13 of utmost point ear 7, the fillet of buckling is mellow and not sharp-pointed, can not cut wound utmost point ear 7, utmost point ear 7 forms effective protection, on the other hand, screening glass 3 adopts the fifty percent discount structure, fifty percent discount simple process, low cost, on the one hand again, screening glass 3 thickness after the fifty percent discount is even unanimous.
The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A cell, characterized by: the single battery comprises an electric core with a lug, a switching piece and a protection plate, wherein the switching piece is connected with the lug and the protection plate in a sequentially-stacked welding mode, the lug is bent to be semi-surrounded by the protection plate, the protection plate is of a folding structure, one side edge of the protection plate is provided with a bending fillet, and the protection plate is provided with one side of the bending fillet towards the bending part of the lug.
2. The cell according to claim 1, wherein: one side of the protection sheet, which is far away from the bending fillet, is provided with an anti-reflection structure.
3. The cell according to claim 2, wherein: the anti-reverse structure is arranged at one corner of the protection plate and is a chamfering structure.
4. The cell according to claim 1, wherein: the protective sheet is manufactured by adopting a process of folding at least twice.
5. The cell according to claim 1, wherein: the adapter plate, the electrode lug and the protective plate are connected through ultrasonic welding.
6. The cell according to claim 1, wherein: the single battery further comprises an insulating sheet, and the insulating sheet is arranged between the protection sheet and the electrode lugs and close to the battery core area.
7. The cell according to claim 1, wherein: the battery top cover comprises a top cover plate and a first pole column unit and a second pole column unit which are arranged on the top cover plate, and the first pole column unit and the second pole column unit are respectively connected with the switching piece.
8. The cell according to claim 1, wherein: the tab comprises a first tab and a second tab which are led out from the battery cell, the first tab is electrically connected with the battery cell first current collector, and the second tab is electrically connected with the battery cell second current collector.
9. The cell according to claim 8, wherein: the first tab and the first battery core current collector are of an integrated structure, and the second tab and the second battery core current collector are of an integrated structure.
10. A power battery pack, characterized in that: the power battery pack comprises a plurality of single batteries according to any one of claims 1 to 9 and a manifold sheet, wherein the manifold sheet is electrically connected with the plurality of single batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922102729.0U CN210805936U (en) | 2019-11-28 | 2019-11-28 | Single battery and power battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922102729.0U CN210805936U (en) | 2019-11-28 | 2019-11-28 | Single battery and power battery pack |
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| Publication Number | Publication Date |
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| CN210805936U true CN210805936U (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922102729.0U Active CN210805936U (en) | 2019-11-28 | 2019-11-28 | Single battery and power battery pack |
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| CN (1) | CN210805936U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512751A (en) * | 2022-02-23 | 2022-05-17 | 上海兰钧新能源科技有限公司 | Battery cell pole column assembly and welding method thereof |
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
| CN117239251A (en) * | 2023-10-19 | 2023-12-15 | 宁夏宝丰昱能科技有限公司 | Manufacturing process of square battery and square battery |
-
2019
- 2019-11-28 CN CN201922102729.0U patent/CN210805936U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
| CN114512751A (en) * | 2022-02-23 | 2022-05-17 | 上海兰钧新能源科技有限公司 | Battery cell pole column assembly and welding method thereof |
| CN114512751B (en) * | 2022-02-23 | 2024-02-09 | 上海兰钧新能源科技有限公司 | Battery core pole column assembly and welding method thereof |
| CN117239251A (en) * | 2023-10-19 | 2023-12-15 | 宁夏宝丰昱能科技有限公司 | Manufacturing process of square battery and square battery |
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| GR01 | Patent grant | ||
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 xinwanda, No.18, Tangjia South Road, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
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