CN219067181U - Insulating film assembly for battery and battery with same - Google Patents
Insulating film assembly for battery and battery with same Download PDFInfo
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- CN219067181U CN219067181U CN202223355205.0U CN202223355205U CN219067181U CN 219067181 U CN219067181 U CN 219067181U CN 202223355205 U CN202223355205 U CN 202223355205U CN 219067181 U CN219067181 U CN 219067181U
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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 provides an insulating film component for a battery and the battery with the insulating film component, comprising: the insulation film is suitable for forming a containing cavity with one open end after being folded, and the bare cell is suitable for being arranged in the containing cavity; the insulating sheet is arranged on the surface of one side of the insulating film opposite to the bare cell, at least part of the insulating sheet is opposite to the insulating film, and the insulating sheet is suitable for closing the vertex angle of one side of the accommodating cavity far away from the open end after being folded. According to the utility model, the insulating sheet is arranged on the insulating film, so that the internal short circuit of the battery cell caused by the fact that the battery cell and the battery cell shell form a current loop through the electrolyte is avoided, the risk of thermal runaway of the battery cell is reduced, and the safety performance of the battery cell is improved.
Description
Technical Field
The utility model relates to the technical field of battery manufacturing, in particular to an insulating film assembly for a battery and the battery with the insulating film assembly.
Background
The battery is used as a power source of electronic products, is widely applied and indispensable in social life. The reserves of the global fossil energy are limited, environmental problems caused by excessive use of fossil fuels also sound the alarm for human energy application, on one hand, renewable energy sources must be developed and utilized, the dependence on single fossil energy sources is reduced, and on the other hand, harmful substances generated by fossil energy consumption are controlled and harmlessly treated. In order to solve the problems, the existing fossil energy driven automobile is replaced by electric energy, namely, the development of a power battery automobile is one of the directions of various countries. According to continuous popularization of electric vehicles, people have increasingly demanded electric vehicles, the phenomenon of supply and shortage appears in the current new energy automobile market, and the battery cell is one of the most main constituent components of the new energy automobile, so that it is very important to design a safe and stable battery cell.
The battery cell insulating film is one of the structural components of the battery cell, and after the battery cell is in external short circuit, the battery cell insulating film can inhibit the internal short circuit of the battery cell while the positive fuse can be fused in time, so that the safety performance of the battery cell is improved.
In the related art, the conventional bare cell insulating sheet has a small hole at each of four corner positions after wrapping the bare cell, when the current reaches the bearable limit value of the cell in the process of testing and using the cell, the fuse of the positive electrode of the cell can be automatically fused to protect the internal short circuit, but because the four corner positions of the used bare cell insulating sheet have a small hole, when the cell bears a larger current, the four corner positions and the cell shell form a loop, and the risk of thermal runaway occurs.
Disclosure of Invention
In view of the above, the present utility model is directed to an insulating film assembly for a battery and a battery having the same, so as to avoid that a current loop is formed between a battery cell and a battery cell housing through a hole of an insulating film, and reduce the risk of thermal runaway of the battery.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
an insulating film assembly for a battery according to an embodiment of the present utility model includes: the insulation film is suitable for forming a containing cavity with one open end after being folded, and the bare cell is suitable for being arranged in the containing cavity; the insulating sheet is arranged on the surface of one side of the insulating film opposite to the bare cell, at least part of the insulating sheet is arranged opposite to the insulating film, and the insulating sheet is suitable for closing the vertex angle of one side of the accommodating cavity away from the open end after being folded.
According to the insulating film component for the battery, disclosed by the embodiment of the utility model, by arranging the insulating sheet on the insulating film, the internal short circuit of the battery core caused by the fact that the battery core and the battery core shell form a current loop through the electrolyte is avoided, the risk of thermal runaway of the battery core is reduced, and the safety performance of the battery core is improved.
In addition, the insulating film unit for a battery according to the present utility model may have the following additional technical features:
according to some embodiments of the utility model, the insulating film includes: a main body part and a turnover part. The main body part is provided with a first crease and a second crease which are arranged in parallel, and the first crease and the second crease are suitable for dividing the main body part into a first side wall, a bottom wall and a second side wall which are connected in sequence; the folding part is connected with the main body part, and a third crease perpendicular to the first crease and the second crease is arranged between the folding part and the main body part.
According to some embodiments of the utility model, the number of the insulating sheets is four, and the centers of the four insulating sheets are respectively overlapped with the four vertexes of the bottom wall.
According to some embodiments of the utility model, the insulating sheet is configured as a circular sheet, and the center of the circular sheet is coincident with the vertex of the bottom wall.
According to some embodiments of the utility model, the insulating sheet is provided with a fourth crease, the fourth crease being arranged co-linearly with the third crease; the insulating sheet is provided with a fifth crease, and the fifth crease is arranged in line with the first crease or the second crease.
In some embodiments of the present utility model, the insulating sheet is provided with a sixth crease, and an angle between a straight line where the sixth crease is located and a straight line where the third crease is located is 45 °.
According to some embodiments of the utility model, the fold comprises: the first sub-turnup part and the second sub-turnup part are respectively arranged at two sides of the first side wall; the third sub-turnup part and the fourth sub-turnup part are respectively arranged at two sides of the bottom wall; the fifth sub-turnup and the sixth sub-turnup are respectively arranged at two sides of the second side wall; the first sub-turnup part, the third sub-turnup part and the fifth sub-turnup part are arranged on the same side of the main body part and are suitable for forming a third side wall connected between the first side wall and the second side wall after being folded; the second sub-turnup, the fourth sub-turnup and the sixth sub-turnup are arranged on the other side of the main body part and are suitable for forming a fourth side wall connected between the first side wall and the second side wall after being folded.
According to some embodiments of the utility model, the insulating sheet is adhesively or welded to the insulating film.
According to some embodiments of the utility model, the insulating film is integrally provided.
Another object of the present utility model is to propose a battery.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a battery comprises the insulating film assembly and a bare cell, wherein the bare cell is arranged in the accommodating cavity.
The advantages of the battery and the insulating film assembly are the same as those of the prior art, and are not described in detail herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic perspective view illustrating a folded structure of an insulation film assembly according to an embodiment of the present utility model.
Fig. 2 is an unfolded front view of an insulation film assembly according to an embodiment of the present utility model.
Reference numerals illustrate:
100. an insulating film assembly;
10. an insulating film; 10a, a receiving cavity;
110. a main body portion; 11a, first folds; 11b, second folds;
111. a bottom wall; 112. a first sidewall; 113. a second sidewall;
120. a turnover part; 12a, third crease;
121. a first sub-hinge; 122. a second sub-hinge; 123. a third sub-hinge; 124. a fourth sub-hinge; 125. a fifth sub-hinge; 126. a sixth sub-turnup;
20. an insulating sheet; 20c, sixth crease.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
The utility model will be described in detail below with reference to fig. 1, 2 in conjunction with the embodiments.
As shown in fig. 1, an insulating film assembly 100 for a battery according to an embodiment of the present utility model includes: an insulating film 10, an insulating sheet 20, the insulating film 10 being adapted to form a housing cavity 10a having one end opened after folding, and a bare cell being adapted to be disposed in the housing cavity 10 a; the insulating sheet 20 is provided on a surface of the insulating film 10 opposite to the bare cell, and at least a portion of the insulating sheet 20 is provided opposite to the insulating film 10 and adapted to close a top corner of the accommodating chamber 10a on a side away from the open end after folding.
Specifically, the insulating film 10 is folded to form a containing cavity 10a for installing the bare cell, the shape of the containing cavity 10a is matched with the shape of the bare cell, for example, when the bare cell is a square cell, the containing cavity 10a formed by the insulating film 10 is of a square structure with one end face open, the bare cell is installed in the containing cavity 10a from the open end of the containing cavity 10a, so that the insulating film 10 can be completely coated on the bare cell, wherein the insulating film 10 at the opening of the containing cavity 10a is connected with a cell cover plate through hot melting, and the insulating film 10 is fixed on the bare cell;
when the accommodating cavity 10a formed by the insulating film 10 has a square structure with an open end surface, as shown in fig. 1, the insulating sheet 20 is mounted on the inner surface of the accommodating cavity 10a at the vertex angle away from the open end side (the circular arc line shown in fig. 1 is a schematic shape of the folded insulating sheet 20), so as to avoid the circuit generated between the four corners of the bottom of the battery cell and the battery cell housing to cause a short circuit of the battery cell.
According to the insulating film assembly 100 for the battery, provided by the embodiment of the utility model, the insulating sheet 20 is arranged on the insulating film 10, so that the internal short circuit of the battery cell caused by the fact that the battery cell and the battery cell shell form a current loop through electrolyte is avoided, the risk of thermal runaway of the battery cell is reduced, and the safety performance of the battery cell is improved.
As shown in fig. 2, in some embodiments of the present utility model, the insulating film 10 includes: a main body 110 and a turnover 120. The main body 110 is provided with a first crease 11a and a second crease 11b arranged in parallel, the first crease 11a and the second crease 11b being adapted to divide the main body 110 into a first side wall 112, a bottom wall 111 and a second side wall 113 connected in sequence; the turnup 120 is connected with the main body 110, and a third crease 12a perpendicular to the first crease 11a and the second crease 11b is arranged between the turnup 120 and the main body 110. Through set up first crease 11a, second crease 11b and third crease 12a on insulating film 10 divide into main part 110 and turn-over 120 with insulating film 10, make insulating film 10 can be through first crease 11a, second crease 11b and third crease 12a fold fast, improved insulating film 10's cladding efficiency, simultaneously, set up first crease 11a, second crease 11b and third crease 12a and can also make insulating film 10's folding position more accurate, reduced folding scrapping, reduced the manufacturing cost of electric core.
Specifically, the first crease 11a and the second crease 11b are located at two sides of the bottom wall 111, the first side wall 112 is vertically connected with the bottom wall 111 by folding the first crease 11a, the second side wall 113 is vertically connected with the bottom wall 111 by folding the second crease 11b, and the first side wall 112 and the second side wall 113 are folded to the same side of the bottom wall 111 and are oppositely arranged; the turnover part 120 is located at both sides of the main body 110 in the left-right direction as shown in fig. 2, and the turnover part 120 is folded by the third fold 12a to be perpendicular to the first side wall 112, the second side wall 113, and the bottom wall 111, respectively.
As shown in fig. 1 and 2, in some embodiments of the present utility model, the number of the insulating sheets 20 is four, and the centers of the four insulating sheets 20 are respectively overlapped with the four vertexes of the bottom wall 111. That is, by arranging the four insulating sheets 20 on the insulating film 10 at the positions of the four vertices of the bottom wall 111, the sealing property of the four vertices of the bottom wall 111 of the insulating film 10 is improved, and the short circuit of the battery cell caused by the loop formed by the electrolyte and the battery cell shell at the bottom of the battery cell is avoided, so that the risk of thermal runaway of the battery cell is reduced, and the safety of the battery cell is improved.
As shown in fig. 1 and 2, in some embodiments of the present utility model, the insulating sheet 20 is configured as a circular sheet, and the center of the circular sheet is disposed coincident with the apex of the bottom wall 111. Through setting the centre of a circle of insulating piece 20 to coincide with the summit of diapire 111, make insulating piece 20 can be with the complete cladding of summit of diapire 111, improved the leakproofness of the summit of diapire 111 of insulating film 10, avoided the electrolyte to flow from holding in the chamber 10a, improved the security of electric core, reduced the disability rate of electric core simultaneously, reduced the manufacturing cost of electric core.
In some embodiments of the present utility model, the insulating sheet 20 is provided with a fourth crease (not shown) arranged in line with the third crease 12 a; the insulating sheet 20 is provided with a fifth crease (not shown) arranged in line with the first crease 11a or the second crease 11 b. That is, by providing the fourth crease and the fifth crease on the insulating sheet 20 so that the insulating sheet 20 can be folded quickly along the fourth crease and the fifth crease, which are provided in line with the third crease 12a, and the fifth crease which is provided in line with the first crease 11a or the second crease 11b, that is, the folding of the insulating sheet 20 at the fourth crease is the same as the folding of the insulating film 10 at the third crease 12a, the folding of the insulating sheet 20 at the fifth crease is the same as the folding of the insulating film 10 at the first crease 11a or the second crease 11b, and the insulating sheet 20 can be completely adhered to the insulating film 10.
Specifically, when the insulating sheet 20 is provided on the apex of the bottom wall 111 in the direction of the first crease 11a, the fifth crease is provided in line with the first crease 11a, i.e., the fold formed at the fifth crease by the insulating sheet 20 is the same as the fold occurring at the first crease 11a by the insulating film 10; when the insulating sheet 20 is provided on the apex of the bottom wall 111 in the direction of the second crease 11b, the fifth crease is provided in line with the second crease 11b, i.e., the fold of the insulating sheet 20 formed at the fifth crease is the same as the fold of the insulating film 10 occurring at the second crease 11 b.
As shown in fig. 2, in some embodiments of the present utility model, the insulating sheet 20 is provided with a sixth crease 20c, and an angle between a straight line where the sixth crease 20c is located and a straight line where the third crease 12a is located is 45 °. By providing the sixth crease 20c to facilitate folding of the insulating sheet 20 along the sixth crease 20c, the folding efficiency of the insulating sheet 20 is improved, while the sixth crease 20c allows the insulating sheet 20 to completely seal the apex on the bottom wall 111 of the insulating film 10.
Specifically, after the insulating sheet 20 is folded by the fourth fold and the fifth fold, a portion of the insulating sheet 20 is attached to the insulating film 10, where a portion of the insulating sheet 20 where the sixth fold 20c is located is not connected to the insulating film 10, and by setting an included angle between a straight line where the sixth fold 20c is located and a straight line where the third fold 12a is located to be 45 °, a portion of the insulating sheet 20 which is not attached to the insulating film 10 is symmetrically disposed along the sixth fold 20c, that is, by disposing the sixth fold 20c, a portion of the insulating sheet 20 which is not attached to the insulating film 10 is symmetrically folded along the sixth fold 20c, the insulating sheet 20 forms three stereoscopic structures which are disposed perpendicular to each other, and the vertex corresponds to the center of a circle, so that the insulating sheet 20 seals the vertex of the bottom wall 111 of the insulating film 10 completely.
In some embodiments of the present utility model, the fold 120 includes: first and second sub-folds 121 and 122, third and fourth sub-folds 123 and 124, fifth and sixth sub-folds 125 and 126. The first sub-turnup 121 and the second sub-turnup 122 are respectively arranged at two sides of the first side wall 112; the third sub-turnup 123 and the fourth sub-turnup 124 are respectively arranged at two sides of the bottom wall 111; fifth sub-hinge 125 and sixth sub-hinge 126 are respectively disposed on both sides of second side wall 113; wherein the first sub-hinge 121, the third sub-hinge 123, and the fifth sub-hinge 125 are disposed on the same side of the main body 110, and adapted to form a third side wall connected between the first side wall 112 and the second side wall 113 after folding; the second sub-tuck 122, the fourth sub-tuck 124, the sixth sub-tuck 126 are provided on the other side of the main body portion 110 and are adapted to form, after folding, a fourth side wall connected between the first side wall 112 and the second side wall 113.
Specifically, the first sub-turnup 121 partially coincides with the third sub-turnup 123 after being folded, the third sub-turnup 123 partially coincides with the fifth sub-turnup 125, the first sub-turnup 121 partially coincides with the fifth sub-turnup 125, that is, the insulating film 10 is folded through the partially overlapping stack of the first sub-turnup 121, the third sub-turnup 123 and the fifth sub-turnup 125, and a third side wall of the accommodating cavity 10a formed by the insulating film 10 extending along the first direction (front-rear direction as shown in fig. 1) is sealed, the third side wall being perpendicular to the bottom wall 111, the first side wall 112 and the second side wall 113, respectively; the second sub-turnup 122, the fourth sub-turnup 124 and the sixth sub-turnup 126 are symmetrically arranged with the first sub-turnup 121, the third sub-turnup 123 and the fifth sub-turnup 125, that is, the insulating film 10 is stacked by overlapping the parts of the first sub-turnup 121, the third sub-turnup 123 and the fifth sub-turnup 125, a fourth side wall of the accommodating cavity 10a formed by the insulating film 10 along the first direction is sealed, and the fourth side wall is respectively perpendicular to the bottom wall 111, the first side wall 112 and the second side wall 113, and the third side wall is opposite to the fourth side wall.
As shown in fig. 2, in some embodiments of the utility model, the fold 120 is configured as a trapezoid. The volume of the insulating film 10 can be reduced by configuring the turnover part 120 into a trapezoid structure, so that the production cost is reduced, specifically, the turnover part 120 can be further configured into a triangle, a square, a polygon or other shapes capable of realizing the functions, and the specific shape of the turnover part 120 is configured according to the actual production requirement, so that the description is omitted.
In some embodiments of the present utility model, the insulating sheet 20 is adhesively or welded to the insulating film 10. That is, the insulating sheet 20 is integrally formed on the insulating film 10, so that the insulating sheet 20 is completely bonded to the insulating film 10, and the local sealability and local strength of the insulating sheet 20 are improved.
Specifically, the insulating sheet 20 and the insulating film 10 are integrally molded by a hot-melt process at a portion of the insulating sheet 20 that is bonded to the insulating film 10. In addition, the insulating sheet 20 and the insulating film 10 may be connected by a colloid material, or may be connected by laser welding, and the insulating sheet 20 and the insulating film 10 may be connected by other manners capable of achieving the above functions, which will not be described in detail herein.
As shown in fig. 2, in some embodiments of the present utility model, the insulating film 10 is integrally provided. Through setting up insulating film 10 an organic whole, make the processing of insulating film 10 more simple and convenient, simultaneously, the insulating film 10 folding back that an organic whole set up has good leakproofness.
Specifically, the insulating film 10 may be processed by cutting, and of course, the insulating film 10 may also be processed by other processing technologies that may form the above structure, which will not be described in detail herein.
A battery according to an embodiment of the present utility model includes: the insulating film unit 100 and the bare cell described above are provided in the accommodation chamber 10 a.
According to the battery provided by the embodiment of the utility model, the insulating sheet 20 is arranged on the insulating film 10, so that the local sealing degree and the local strength of the insulating film assembly 100 are improved, the situation that the electrolyte flows out of the inside of the battery core to enable the battery core and the battery core shell to form a loop so as to generate a battery core short circuit is avoided, the risk of thermal runaway of the battery is reduced, the safety of the battery is improved, the rejection rate of the battery is reduced, and the production cost of the battery is reduced.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. An insulating film assembly for a battery, comprising:
an insulating film (10), the insulating film (10) being adapted to form a housing cavity (10 a) having one end open after folding, and a bare cell being adapted to be arranged within the housing cavity (10 a); the insulating sheet (20), insulating sheet (20) are established insulating film (10) with the opposite side surface of naked electric core, just insulating sheet (20) at least part with insulating film (10) set up relatively, and be suitable for after folding seal hold chamber (10 a) and keep away from the apex angle department of open end one side.
2. The insulating film assembly for a battery according to claim 1, wherein the insulating film (10) comprises:
a main body portion (110), wherein the main body portion (110) is provided with a first crease (11 a) and a second crease (11 b) which are arranged in parallel, and the first crease (11 a) and the second crease (11 b) are suitable for separating the main body portion (110) into a first side wall (112), a bottom wall (111) and a second side wall (113) which are connected in sequence;
the folding part (120), the folding part (120) with the main part (110) links to each other, just the folding part (120) with be equipped with between the main part (110) with first crease (11 a), third crease (12 a) that second crease (11 b) are perpendicular.
3. The insulating film unit for a battery according to claim 2, wherein the number of the insulating sheets (20) is four, and the centers of the four insulating sheets (20) are disposed to coincide with the four vertexes of the bottom wall (111), respectively.
4. The insulating film assembly for a battery according to claim 2, wherein the insulating sheet (20) is configured as a circular sheet, the center of which is disposed coincident with the apex of the bottom wall (111).
5. The insulating film assembly for a battery according to claim 4, wherein the insulating sheet (20) is provided with a fourth crease, which is arranged in line with the third crease (12 a);
the insulating sheet (20) is provided with a fifth crease, and the fifth crease is arranged in line with the first crease (11 a) or the second crease (11 b).
6. The insulating film unit for a battery according to claim 5, wherein the insulating sheet (20) is provided with a sixth crease (20 c), and an angle between a straight line where the sixth crease (20 c) is located and a straight line where the third crease (12 a) is located is 45 °.
7. The insulating film assembly for a battery according to claim 2, wherein the turnover part (120) includes:
a first sub-turnup (121) and a second sub-turnup (122), the first sub-turnup (121) and the second sub-turnup (122) being respectively provided on both sides of the first side wall (112);
a third sub-turnup (123) and a fourth sub-turnup (124), the third sub-turnup (123) and the fourth sub-turnup (124) being provided on both sides of the bottom wall (111), respectively;
a fifth sub-turnup (125) and a sixth sub-turnup (126), the fifth sub-turnup (125) and the sixth sub-turnup (126) being provided on both sides of the second side wall (113), respectively;
wherein the first sub-turnup (121), the third sub-turnup (123), the fifth sub-turnup (125) are arranged on the same side of the main body part (110) and are suitable for forming a third side wall connected between the first side wall (112) and the second side wall (113) after folding;
the second sub-hinge (122), the fourth sub-hinge (124), the sixth sub-hinge (126) are provided on the other side of the main body (110) and are adapted to form a fourth side wall connected between the first side wall (112) and the second side wall (113) after folding.
8. The insulating film assembly for a battery according to claim 2, wherein the insulating sheet (20) is adhesively or welded to the insulating film (10).
9. The insulating film assembly for a battery according to any one of claims 1 to 8, wherein the insulating film (10) is integrally provided.
10. A battery, comprising:
an insulating film assembly (100), the insulating film assembly (100) being an insulating film assembly (100) according to any one of claims 1-9;
and the bare cell is arranged in the accommodating cavity (10 a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355205.0U CN219067181U (en) | 2022-12-12 | 2022-12-12 | Insulating film assembly for battery and battery with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355205.0U CN219067181U (en) | 2022-12-12 | 2022-12-12 | Insulating film assembly for battery and battery with same |
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| Publication Number | Publication Date |
|---|---|
| CN219067181U true CN219067181U (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223355205.0U Active CN219067181U (en) | 2022-12-12 | 2022-12-12 | Insulating film assembly for battery and battery with same |
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| Country | Link |
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| CN (1) | CN219067181U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175023A (en) * | 2023-10-31 | 2023-12-05 | 宁德时代新能源科技股份有限公司 | Preparation process of battery monomer, battery and electricity utilization device |
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2022
- 2022-12-12 CN CN202223355205.0U patent/CN219067181U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175023A (en) * | 2023-10-31 | 2023-12-05 | 宁德时代新能源科技股份有限公司 | Preparation process of battery monomer, battery and electricity utilization device |
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