CN214336772U - Winding cell structure and lithium ion battery - Google Patents
Winding cell structure and lithium ion battery Download PDFInfo
- Publication number
- CN214336772U CN214336772U CN202120665942.7U CN202120665942U CN214336772U CN 214336772 U CN214336772 U CN 214336772U CN 202120665942 U CN202120665942 U CN 202120665942U CN 214336772 U CN214336772 U CN 214336772U
- Authority
- CN
- China
- Prior art keywords
- winding
- positive
- anodal
- cell structure
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application provides a coiling electricity core structure and lithium ion battery. The winding battery cell structure comprises a winding diaphragm, a negative plate and a positive plate; the wound membrane comprises a plurality of winding straight parts and a plurality of winding bending parts; the negative plate is positioned on the inner side of the winding diaphragm; the positive plate is located the coiling diaphragm, and the one side that the positive plate is close to the negative plate has a plurality of anodal coating district and a plurality of anodal empty paper tinsel district, and every anodal coating district sets up with the anodal empty paper tinsel district is adjacent, and anodal coating district is used for coating anodal thick liquids, and anodal empty paper tinsel district is used for exposing anodal aluminium foil, and every anodal empty paper tinsel district sets up with a coiling bending part of coiling diaphragm relatively. The positive pole empty foil area corresponds to the winding bending part, when the positive pole piece is wound, no slurry exists at the bending position on the inner side of the positive pole piece, so that the condition of lithium ion concentration difference cannot be formed between the positive pole piece and the negative pole piece, the generation probability of a lithium precipitation phenomenon is reduced, and the use safety performance is improved.
Description
Technical Field
The utility model relates to a lithium ion battery technical field especially relates to a coiling electricity core structure and lithium ion battery.
Background
With the development of lithium ion battery technology, the lithium ion battery has the functions of small volume, high power and good heat dissipation, so that the lithium ion battery becomes a mainstream battery. In the production and manufacturing process of the lithium ion battery cell, the winding is carried out on the winding needle, so that the positive plate, the negative plate and the diaphragm form the winding battery cell together for assembling the lithium ion battery.
However, on the wound electric core, the density of the slurry on the inner side of the bending position of the positive plate is increased sharply, so that the lithium ion concentration on the inner side of the positive plate is too high at the bending position, and the lithium ions on the inner side of the positive plate permeate to the outer side of the negative electrode with low concentration through the diaphragm, so that the allowance of the negative plate is insufficient, lithium precipitation is formed, and potential safety hazards are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, provide a coiling electricity core structure and lithium ion battery who improves the safety in utilization.
The purpose of the utility model is realized through the following technical scheme:
a wound cell structure comprising: winding the diaphragm, the negative plate and the positive plate; the winding diaphragm comprises a plurality of winding straight parts and a plurality of winding bent parts, each winding bent part is respectively connected with two winding straight parts, each winding bent part is provided with a bent curved surface, and each winding bent part is used for changing the winding direction of two adjacent winding straight parts; the negative electrode sheet is positioned on the inner side of the winding diaphragm, and the negative electrode sheet is attached to the inner side of the winding diaphragm; the positive plate is located in the coiling diaphragm, the positive plate is close to the one side of negative plate has a plurality of positive coating district and the empty paper tinsel district of a plurality of positive poles, each positive coating district and one the empty paper tinsel district of positive pole is adjacent to be set up, positive coating district is used for coating anodal thick liquids, the empty paper tinsel district of positive pole is used for exposing anodal aluminium foil, each the empty paper tinsel district of positive pole with one of coiling diaphragm the relative setting of coiling kink, wherein, the coiling direction of positive plate and the coiling direction of negative plate all with the coiling direction of coiling diaphragm is the same.
In one embodiment, the positive electrode coating area comprises a tab area and a flat coating area which are adjacently arranged, the tab area is arranged adjacent to the positive electrode empty foil area, the length of the tab area is greater than that of the flat coating area in the direction perpendicular to the winding direction of the wound diaphragm, and the tab area is used for connecting a tab.
In one embodiment, a positive electrode empty foil area is arranged between two adjacent flat coating areas.
In one embodiment, the positive plate is provided with a plurality of grooves, each groove is arranged corresponding to one positive empty foil area, and the width of each groove is greater than that of the corresponding positive empty foil area.
In one embodiment, the widths of the plurality of grooves increase in an equal difference in a direction along winding of the wound separator.
In one embodiment, the distance between two adjacent positive electrode empty foil regions gradually increases in the winding direction along the wound separator.
In one embodiment, the spacing difference between two adjacent positive electrode empty foil areas is equal.
In one embodiment, the difference of the spacing between two adjacent positive electrode empty foil areas is 0.2mm to 0.4 mm.
In one embodiment, the difference of the spacing between two adjacent positive electrode empty foil areas is 0.3 mm.
A lithium ion battery comprising the wound cell structure of any of the above embodiments.
Compared with the prior art, the utility model discloses at least, following advantage has:
the positive pole empty foil area corresponds to the winding bending part, when the positive pole piece is wound, no slurry exists at the bending position on the inner side of the positive pole piece, so that the condition of lithium ion concentration difference cannot be formed between the positive pole piece and the negative pole piece, the generation probability of a lithium precipitation phenomenon is reduced, and the use safety performance is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a wound cell structure in an embodiment;
fig. 2 is a schematic structural diagram of the positive electrode sheet of the wound cell structure shown in fig. 1.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model relates to a coiling electricity core structure. In one embodiment, the wound cell structure comprises a wound separator, a negative electrode sheet and a positive electrode sheet. The wound membrane includes a plurality of winding straight portions and a plurality of winding bent portions. Each coiling bending part is respectively connected with two coiling straight portions, the coiling bending part has a bending surface, the coiling bending part is used for changing the coiling direction of two adjacent coiling straight portions. The negative electrode plate is positioned on the inner side of the winding diaphragm, and the negative electrode plate is attached to the inner side of the winding diaphragm. The positive plate is positioned in the winding diaphragm, and one surface of the positive plate, which is close to the negative plate, is provided with a plurality of positive coating areas and a plurality of positive empty foil areas. Each positive coating area is arranged adjacent to one positive empty foil area, and the positive coating area is used for coating positive slurry. The positive electrode empty foil area is used for exposing a positive electrode aluminum foil, and each positive electrode empty foil area is opposite to one winding bending part of the winding diaphragm. Wherein the winding direction of the positive electrode sheet and the winding direction of the negative electrode sheet are both the same as the winding direction of the winding separator. The positive pole empty foil area corresponds to the winding bending part, when the positive pole piece is wound, no slurry exists at the bending position on the inner side of the positive pole piece, so that the condition of lithium ion concentration difference cannot be formed between the positive pole piece and the negative pole piece, the generation probability of a lithium precipitation phenomenon is reduced, and the use safety performance is improved.
Please refer to fig. 1, which is a schematic structural diagram of a winding cell structure according to an embodiment of the present invention.
The wound cell structure 10 of an embodiment includes a wound separator 100, a negative electrode sheet 200, and a positive electrode sheet 300. The wound separator 100 includes a plurality of winding straight portions 110 and a plurality of winding bent portions 120. Each of the winding-bent portions 120 is connected to two of the winding straight portions 110, the winding-bent portion 120 has a bent surface, and the winding-bent portion 120 is used for changing the winding direction of two adjacent winding straight portions 110. The negative electrode sheet 200 is located on the inner side of the winding diaphragm 100, and the negative electrode sheet 200 is attached to the inner side of the winding diaphragm 100. The positive electrode sheet 300 is located in the wound separator 100, and referring to fig. 2, a surface of the positive electrode sheet 300 close to the negative electrode sheet 200 has a plurality of positive coating regions 310 and a plurality of positive foil regions 320. Each of the positive electrode coating regions 310 is disposed adjacent to one of the positive electrode empty foil regions 320, and the positive electrode coating region 310 is used for coating positive electrode slurry. The positive electrode empty foil area 320 is used for exposing a positive electrode aluminum foil, and each positive electrode empty foil area 320 is arranged opposite to one winding bending part 120 of the winding diaphragm 100. Wherein the winding direction of the positive electrode sheet 300 and the winding direction of the negative electrode sheet 200 are both the same as the winding direction of the wound separator 100.
In the present embodiment, the positive electrode empty foil area 320 corresponds to the winding and bending part 120, and when the positive electrode sheet 300 is wound, there is no slurry on the inner side of the positive electrode sheet 300 at the bending position, so that a lithium ion concentration difference cannot be formed between the positive electrode sheet 300 and the negative electrode sheet 200, and the occurrence probability of a lithium ion deposition phenomenon is reduced, thereby improving the safety performance. In the present embodiment, for convenience of description of the wound cell structure, the winding direction of the wound separator 100 is set to be counterclockwise.
In one embodiment, referring to fig. 2, the positive electrode coating area 310 includes a tab area 312 and a flat coating area 314, the tab area 312 is disposed adjacent to the positive electrode empty foil area 320, the length of the tab area 312 is greater than the length of the flat coating area 314 in the winding direction perpendicular to the wound separator 100, and the tab area 312 is used for connecting a tab. In this embodiment, the tab area 312 and the flat coating area 314 are both coated with positive slurry, and the tab area 312 is further used to guide tabs to the positive plate 300, so as to weld the tabs on the positive plate 300. The length of the tab region 312 being greater than the length of the flat painted region 314 indicates that a portion of the tab region 312 protrudes beyond the positive blank foil region 320 such that a portion of the tab region 312 is outside, and this protruding portion serves as a location for welding with a tab. Moreover, the positive electrode lug area 312 is coated with positive electrode slurry, so that after the electrode lug is welded with the positive electrode lug area 312, the electrode lug is directly guided to the outside of the winding battery cell structure, the electrode lug is not required to be embedded into the winding battery cell structure, and the condition that the thickness of the winding battery cell structure is increased is avoided.
Further, referring to fig. 2, the positive electrode empty foil area 320 is disposed between two adjacent flat coating areas 314. In this embodiment, in order to conveniently set the plurality of tab areas 312 at the same position of the winding cell structure, even if a single-ended tab 300 of the positive electrode sheet 300 is formed on the winding cell structure, one positive electrode empty foil area 320 is located between two adjacent flat coating areas 314, and the positive electrode empty foil area 320 corresponds to the winding bent portion 120, so that one bending is performed between the two adjacent flat coating areas 314, and it is convenient to overlap the two adjacent tab areas 312, so that the plurality of tab areas 312 are overlapped with each other, and thus the tab 300 of the positive electrode sheet 300 of the winding cell structure is simultaneously connected to the plurality of tab areas 312, thereby improving the current conduction efficiency on the positive electrode sheet 300, i.e. ensuring that the tab and the positive electrode sheet 300 are stably conducted.
Still further, referring to fig. 2, the positive electrode sheet 300 is provided with a plurality of grooves 330, each groove 330 is disposed corresponding to one of the positive electrode empty foil areas 320, and the width of the groove 330 is greater than the width of the positive electrode empty foil area 320. In this embodiment, the positive electrode empty foil area 320 corresponds to the winding bending portion 120, that is, the positive electrode empty foil area 320 is located at the bending position of the wound cell structure. In order to facilitate bending of the tab regions 312, the grooves 330 are formed in corresponding positions of the positive electrode empty foil regions 320, so that the width of the positive electrode empty foil regions 320 is smaller than the width of the tab regions 312, that is, a concave structure is formed between two adjacent tab regions 312 and the positive electrode empty foil region 320 located between the two tab regions 312, so that when the positive electrode sheet 300 is bent, a certain interval exists between two adjacent tab regions, and the tab regions are stacked after being bent.
Further, referring to fig. 2, the widths of the plurality of grooves 330 increase in an equal difference in the direction along the winding of the wound separator 100. In this embodiment, the positive electrode sheet 300 is wound multiple times along with the separator to form a multi-layer winding structure, such that the distance between two adjacent positive electrode coating regions 310 on the positive electrode sheet 300 is gradually increased, that is, in the winding cell structure, two adjacent positive electrode coating regions 310 on the positive electrode sheet 300 are oppositely arranged, and the thickness between the two adjacent positive electrode coating regions 310 is increased. In this way, after each winding, the bending position of the positive electrode sheet 300 corresponds to the groove 330, and the widths of the grooves 330 are set to be increased in an equal difference manner, so that the widths of the grooves 330 are distributed in an equal difference number series manner in the winding direction of the wound separator 100 to be matched with the bending edge of the wound battery cell structure, and it is ensured that no slurry exists inside the positive electrode sheet 300 at each bending position.
In one embodiment, referring to fig. 2, the distance between two adjacent positive electrode empty foil regions 320 gradually increases in the winding direction of the wound separator 100. In this embodiment, as the number of winding times increases, the arc length of the positive electrode sheet 300 at the bent position also gradually increases. The distance between two adjacent positive electrode empty foil areas 320 corresponds to the distance between two bending positions of different winding layers, and when the arc length of the bending position is increased, the distance between two adjacent positive electrode empty foil areas 320 needs to be adjusted, and the distance between two adjacent positive electrode empty foil areas 320 is also set to be gradually increased so as to ensure that each positive electrode empty foil area 320 corresponds to one bending position.
Further, referring to fig. 2, the distance difference between two adjacent positive electrode empty foil regions 320 is equal. In this embodiment, the thicknesses of the positive electrode sheet 300, the negative electrode sheet 200, and the separator are maintained to be the same, so that the thickness of the wound cell structure increases by the same value after each winding, and in order to adapt to the above-mentioned thickness variation, that is, to ensure that each positive electrode empty foil region 320 corresponds to one bending position, the distance between two adjacent positive electrode empty foil regions 320 is set to be equal, so that the lengths of the positive electrode empty foil regions 320 are distributed in an equal-difference array along the winding direction of the wound separator 100. In another embodiment, the difference between the distances between two adjacent positive electrode empty foil regions 320 is 0.2mm to 0.4 mm. Specifically, the difference between the spacing between two adjacent positive electrode empty foil areas 320 is 0.3 mm.
The application further provides a lithium ion battery, which comprises the winding battery cell structure in any embodiment. In this embodiment, the winding cell structure includes a winding separator, a negative electrode sheet, and a positive electrode sheet. The wound membrane includes a plurality of winding straight portions and a plurality of winding bent portions. Each coiling bending part is respectively connected with two coiling straight portions, the coiling bending part has a bending surface, the coiling bending part is used for changing the coiling direction of two adjacent coiling straight portions. The negative electrode plate is positioned on the inner side of the winding diaphragm, and the negative electrode plate is attached to the inner side of the winding diaphragm. The positive plate is positioned in the winding diaphragm, and one surface of the positive plate, which is close to the negative plate, is provided with a plurality of positive coating areas and a plurality of positive empty foil areas. Each positive coating area is arranged adjacent to one positive empty foil area, and the positive coating area is used for coating positive slurry. The positive electrode empty foil area is used for exposing a positive electrode aluminum foil, and each positive electrode empty foil area is opposite to one winding bending part of the winding diaphragm. Wherein the winding direction of the positive electrode sheet and the winding direction of the negative electrode sheet are both the same as the winding direction of the winding separator. The positive pole empty foil area corresponds to the winding bending part, when the positive pole piece is wound, no slurry exists at the bending position on the inner side of the positive pole piece, so that the condition of lithium ion concentration difference cannot be formed between the positive pole piece and the negative pole piece, the generation probability of a lithium ion phenomenon is reduced, and the use safety performance of the lithium ion battery is improved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A wound cell structure, comprising:
the winding membrane comprises a plurality of winding straight parts and a plurality of winding bent parts, wherein each winding bent part is respectively connected with two winding straight parts, each winding bent part is provided with a bent curved surface, and each winding bent part is used for changing the winding direction of two adjacent winding straight parts;
the negative plate is positioned on the inner side of the winding diaphragm, and the negative plate is attached to the inner side of the winding diaphragm;
the positive plate, the positive plate is located in the diaphragm is convoluteed, the positive plate is close to the one side of negative plate has the empty paper tinsel district of a plurality of anodal coating districts and a plurality of anodal, each anodal coating district and one the empty paper tinsel district of anodal is adjacent to be set up, anodal coating district is used for coating anodal thick liquids, the empty paper tinsel district of anodal is used for exposing anodal aluminium foil, each the empty paper tinsel district of anodal with the diaphragm is convoluteed one the winding kink sets up relatively, wherein, the winding direction of positive plate and the winding direction of negative plate all with the winding direction of the diaphragm is convoluteed the same.
2. The wound cell structure of claim 1, wherein the positive coating region comprises a tab region and a flat coating region, the tab region is disposed adjacent to the positive foil region, the tab region has a length greater than that of the flat coating region in a direction perpendicular to a winding direction of the wound separator, and the tab region is configured to connect a tab.
3. The wound cell structure of claim 2, wherein a positive empty foil region is disposed between two adjacent flat coating regions.
4. The winding cell structure of claim 2, wherein the positive plate is provided with a plurality of grooves, each groove is arranged corresponding to one of the positive empty foil areas, and the width of each groove is greater than the width of each positive empty foil area.
5. The wound cell structure of claim 4, wherein the plurality of grooves increase in width by equal difference in a direction along the winding of the wound separator.
6. The wound cell structure of claim 1, wherein the spacing between two adjacent positive electrode empty foil regions increases gradually in the direction along the winding of the wound separator.
7. The wound cell structure of claim 6, wherein the difference in spacing between two adjacent positive empty foil regions is equal.
8. The wound cell structure of claim 7, wherein the difference in spacing between two adjacent positive electrode empty foil regions is 0.2mm to 0.4 mm.
9. The wound cell structure of claim 8, wherein the difference in spacing between two adjacent positive electrode empty foil regions is 0.3 mm.
10. A lithium ion battery comprising the wound cell structure of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120665942.7U CN214336772U (en) | 2021-03-31 | 2021-03-31 | Winding cell structure and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120665942.7U CN214336772U (en) | 2021-03-31 | 2021-03-31 | Winding cell structure and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214336772U true CN214336772U (en) | 2021-10-01 |
Family
ID=77889228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120665942.7U Active CN214336772U (en) | 2021-03-31 | 2021-03-31 | Winding cell structure and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214336772U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116190806A (en) * | 2023-02-28 | 2023-05-30 | 深圳市康胜新能源产品有限公司 | Lithium iron phosphate battery cell and battery cell processing technology |
-
2021
- 2021-03-31 CN CN202120665942.7U patent/CN214336772U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116190806A (en) * | 2023-02-28 | 2023-05-30 | 深圳市康胜新能源产品有限公司 | Lithium iron phosphate battery cell and battery cell processing technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11611111B2 (en) | Wound-type battery cell | |
| CN111668451B (en) | Preparation method of pole piece for winding type multi-pole lug battery cell, pole piece and battery cell | |
| CN101640286B (en) | Core of spirally wound lithium battery and spirally wound lithium battery | |
| CN113193165A (en) | Pole lug and winding battery | |
| US11611100B2 (en) | Coiled cell | |
| CN206098526U (en) | Coiling formula secondary electricity core | |
| WO2020007130A1 (en) | Negative electrode plate for lithium battery, and lithium battery | |
| CN102544437A (en) | Differential pitch pole piece and power battery adopting same | |
| US20220102817A1 (en) | Multi-tab cylindrical battery roll core and lithium ion battery | |
| CN216213939U (en) | Battery cell, battery and electronic equipment | |
| CN212848488U (en) | Pole piece, battery and electronic device | |
| CN214336772U (en) | Winding cell structure and lithium ion battery | |
| CN110400959A (en) | A kind of winding double-core packet, winding double-core pack the method for making and lithium ion battery | |
| CN216120639U (en) | Power battery connecting sheet, battery core and battery | |
| CN215644564U (en) | Pole piece assembly, battery and electronic equipment | |
| CN219800905U (en) | Battery cell and battery | |
| CN107293806B (en) | Winding type battery cell | |
| CN219575722U (en) | Full-tab winding core and lithium ion battery thereof | |
| CN218385353U (en) | Winding electric core | |
| CN217507589U (en) | Connection piece, electric core structure and battery of lamination battery | |
| JP6987983B2 (en) | Revolving battery cell | |
| CN107293804B (en) | Winding type battery cell | |
| CN112928402A (en) | Battery core and battery | |
| CN107732285B (en) | Combined type electric core | |
| KR20220000639A (en) | Electrode assembly and manufacturing method of the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |