CN114068859B - Positive plate and battery - Google Patents
Positive plate and battery Download PDFInfo
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- CN114068859B CN114068859B CN202111368387.2A CN202111368387A CN114068859B CN 114068859 B CN114068859 B CN 114068859B CN 202111368387 A CN202111368387 A CN 202111368387A CN 114068859 B CN114068859 B CN 114068859B
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- coating
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- groove
- positive electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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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
Abstract
The embodiment of the invention provides a positive plate and a battery, comprising: the current collector comprises a current collector body, a first coating, a second coating and a protective layer, wherein the first coating is coated on the surface of the current collector body, a groove is formed in the surface of the first coating, the bottom surface of the groove is covered by the second coating, and the thickness of the second coating is smaller than that of the first coating; the protective layer is arranged on the surface of the first coating, and the projection of part of the edge of the protective layer on the current collector is positioned in the second coating. According to the embodiment of the invention, the groove is formed in the first coating, the thickness of the second coating on the bottom surface of the groove is smaller than that of the first coating, and the concentration of lithium ions at the edge of the protective layer is reduced, so that the possibility of lithium precipitation at the position of the negative plate corresponding to the edge of the protective layer is reduced, the deformation problem of the lithium ion battery is further improved, and the service life of the lithium ion battery is prolonged.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a positive plate and a battery.
Background
Lithium ion batteries are widely used in the fields of communication, digital, electric vehicles, and the like because of their good energy density performance and service life performance. With the continuous use of lithium ion batteries, the market has higher requirements on the performance of lithium ion batteries. Currently, in order to improve the charging speed and energy density of a lithium ion battery, a process of arranging a tab is adopted in the prior art. However, in the prior art, the lithium ion battery adopting the middle-arranged process of the tab has the problem of lithium precipitation at the edge position of the negative electrode tab, so that the battery core is easy to fail or deform, and the service life of the lithium ion battery is lower.
Therefore, the service life of the lithium ion battery is lower in the prior art.
Disclosure of Invention
The embodiment of the invention provides a battery positive plate and a battery, which are used for solving the problem of lower service life of a lithium ion battery in the prior art.
To achieve the above object, an embodiment of the present invention provides a positive electrode sheet, including: a current collector, a first coating, a second coating and a protective layer, wherein,
the first coating is coated on the surface of the current collector, a groove is formed in the surface of the first coating, the bottom surface of the groove is covered by the second coating, and the thickness of the second coating is smaller than that of the first coating;
the protective layer is arranged on the surface of the first coating, and the projection of part of the edge of the protective layer on the current collector is positioned in the second coating.
In one possible implementation, the thickness of the second coating layer ranges from 10 to 150 μm.
In one possible implementation, the first coating includes a covered region covered by the protective layer and a non-covered region connected to the covered region by the second coating;
the distance between the edge of the non-covering area close to the protective layer and the edge of the protective layer close to the non-covering area is 0-3mm.
In one possible implementation, the cross-sectional shape of the second coating is a planar, stepped or arcuate configuration.
In one possible implementation, the second coating layer communicates with two opposite sides of the current collector in the width direction of the positive electrode sheet.
In one possible implementation, the shape of the groove is a wavy line type, a folded line type or a linear type, and the width of the groove is 1-3mm.
In one possible implementation, the first coating includes a covered region covered by the protective layer and a non-covered region connected to the covered region by the second coating;
the groove is formed by recessing inwards from one side surface of the first coating, and the groove is arranged around the coverage area.
In one possible implementation scheme, the projection of the groove on the current collector is U-shaped, V-shaped, arc-shaped, right trapezoid or triangle;
the width of the groove is 1-3mm.
In one possible implementation, in the length direction of the positive plate, the protective layer includes a first side and a second side that are disposed opposite to each other, the first side of the protective layerThe distance between the edge and the edge of its corresponding coverage area is L 1 The distance between the second side edge of the protective layer and the edge of the corresponding coverage area is L 2 ，|L 1 -L 2 The range of I is 0-2mm.
Another embodiment of the present invention provides a battery comprising the positive electrode tab provided in the above embodiment, wherein the protective layer and the groove are located at the end of the positive electrode tab.
Still another embodiment of the present invention provides a battery, including the positive electrode tab provided in the above embodiment, further including a negative electrode tab and a negative electrode tab fixed on a surface of the negative electrode tab, where the protective layer and the groove are located at a position of the positive electrode tab corresponding to the negative electrode tab.
One of the above technical solutions has the following advantages or beneficial effects:
in the embodiment of the invention, the groove and the second coating layer positioned in the groove are arranged on the first coating layer, and the edge of the protective layer is positioned in the second coating layer of the groove, so that the lithium source of the first coating layer at the edge of the protective layer is reduced, the lithium ions released by the first coating layer at the edge of the protective layer are reduced, and the possibility of precipitating lithium at the position of the negative plate corresponding to the edge of the protective layer is reduced; meanwhile, the second coating layer with the thickness smaller than that of the first coating layer can ensure that the first coating layer at the edge of the protective layer has enough lithium ion concentration, and can effectively improve the energy density of the battery on the premise of avoiding lithium precipitation at the position of the negative electrode plate corresponding to the edge of the protective layer, namely, the safety performance of the battery is improved on the premise of ensuring higher energy density, so that the deformation problem of the lithium ion battery is improved, and the service life of the lithium ion battery is prolonged; furthermore, the projection is located the partial border of protective layer in the second coating can also reduce the thickness of positive plate to a certain extent, improves the thickness uniformity of battery electric core.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a positive plate according to an embodiment of the present invention;
FIG. 2 is a schematic view of a prior art positive electrode sheet;
FIG. 3 is a schematic structural view of another positive plate according to an embodiment of the present invention;
fig. 4 is a schematic structural view of another positive electrode tab of the prior art.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the "first" and "second" distinguished objects generally are of the type and do not limit the number of objects, e.g., the first object may be one or more.
The positive plate structure of the prior art is shown in fig. 2 and 4, and the positive plate comprises a current collector, a coating and a protective layer positioned on the coating, wherein the problem of lithium precipitation easily occurs at the position of the negative plate corresponding to the edge of the protective layer, so that the situation that the battery core is easy to fail or deform occurs, and the service life of the lithium ion battery is lower.
Referring to fig. 1 and 3, fig. 1 and 3 are schematic structural diagrams of a positive electrode sheet according to an embodiment of the present invention, and the positive electrode sheet shown in fig. 1 includes: current collector 10, first coating 20, second coating 30, and protective layer 40, wherein,
the first coating 20 is coated on the surface of the current collector 10, a groove 201 is formed in the surface of the first coating 20, the bottom surface of the groove 201 is covered by the second coating 30, and the thickness of the second coating 30 is smaller than that of the first coating 20;
the protective layer 40 is disposed on the surface of the first coating layer 20, and the projection of a portion of the edge of the protective layer 40 onto the current collector 10 is located within the second coating layer 30.
In a specific example, the material of the current collector 10 may be aluminum foil; the current collector 10 may have a rectangular shape. In yet another specific example, the protective layer may be, for example, gummed paper.
In one specific example, the first coating and the second coating include an active material including at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, and ternary materials. In a further specific example, the first coating may be formed on the current collector 10 by coating, and then the grooves and the second coating within the grooves may be formed by cleaning, etc.
In one specific example, the surface of the current collector 10 includes a first face and a second face, and the first face and the second face of the current collector 10 are each provided with a first coating, a groove in the first coating, a second coating located in the groove, and a protective layer disposed on the surface of the first coating. The projections of the grooves of the first side of the current collector, the second coating and the protective layer on the current collector 10 and the projections of the grooves of the second side of the current collector 10, the second coating and the protective layer on the current collector 10 may be overlapped or not overlapped, respectively.
In the embodiment, the groove and the second coating layer positioned in the groove are arranged on the first coating layer, and the edge of the protective layer is positioned in the second coating layer of the groove, so that the lithium source of the first coating layer at the edge of the protective layer is reduced, the lithium ions released by the first coating layer at the edge of the protective layer are reduced, and the possibility of precipitating lithium at the position of the negative plate corresponding to the edge of the protective layer is reduced; meanwhile, the second coating layer with the thickness smaller than that of the first coating layer can ensure that the first coating layer at the edge of the protective layer has enough lithium ion concentration, and can effectively improve the energy density of the battery on the premise of avoiding lithium precipitation at the position of the negative electrode plate corresponding to the edge of the protective layer, namely, the safety performance of the battery is improved on the premise of ensuring higher energy density, so that the deformation problem of the lithium ion battery is improved, and the service life of the lithium ion battery is prolonged; furthermore, the projection is located the partial border of protective layer in the second coating can also reduce the thickness of positive plate to a certain extent, improves the thickness uniformity of battery electric core.
As an alternative embodiment, the thickness of the second coating 30 ranges from 10 to 150 μm.
In this embodiment, the thickness of the second coating layer 30 is set to 10 to 150 μm to effectively suppress precipitation of lithium and prevent occurrence of short circuit of the battery due to exposure of the current collector 10.
As an alternative embodiment, the first coating 20 includes a covered region covered by the protective layer 40 and a non-covered region connected to the covered region by the second coating 30;
the distance between the edge of the non-covered region near the protective layer 40 and the edge of the protective layer 40 near the non-covered region is 0-3mm.
In this embodiment, the edge of the protective layer is brought into contact with the edge of the protective layer near the non-covered region, so that the stability of the protective layer is improved, and the protective layer is prevented from loosening during winding.
As an alternative embodiment, the cross-sectional shape of the second coating 30 is a planar, stepped or arcuate configuration.
In this embodiment, the second coating layer 30 may have a planar, stepped or arc structure to satisfy normal production under different process conditions, while achieving an effect of suppressing lithium precipitation.
As an alternative embodiment, the second coating layer 30 communicates with both opposite sides of the current collector 10 in the width direction of the positive electrode sheet.
In this embodiment, the protective layer 40 needs to cover the first coating layer 20 in the width direction, preventing the problem of short circuit caused by the penetration of burrs through the separator in the battery. To achieve a better effect of suppressing lithium precipitation, the second coating 30 needs to be connected to two opposite sides of the current collector 10, so that the edges of the protection layer 40 are located in the non-coverage area.
As an alternative embodiment, the shape of the groove 201 is a wavy line type, a folded line type or a straight line type, and the width of the groove 201 is 1-3mm.
In this embodiment, too large a width of the second coating layer 30 will result in a decrease in energy density of the battery, while too small a width of the second coating layer 30 cannot effectively inhibit the edge of the protective layer 40 from precipitating lithium, and cannot effectively improve the service life of the battery. In the embodiment of the invention, the width of the second coating 30 is set to be 1-3mm through experiments, so that lithium precipitation at the edge of the protective layer 40 can be effectively inhibited while the energy density of the battery is ensured, and the service life of the battery is prolonged.
The grooves 201 are of wave line type, folded line type or linear type, which can adapt to production under different process conditions and can inhibit lithium precipitation.
Wherein, to obtain the optimal width of the second coating 30, the test is performed by the following experimental manner:
example 1 a first positive electrode sheet was prepared: mixing and stirring a lithium cobalt oxide positive electrode main material, a conductive agent and polyvinylidene fluoride according to a fixed proportion, adding an NMP (N-methyl-2-pyrrolidone) solvent to prepare positive electrode slurry, coating the positive electrode slurry on the surface of a current collector 10, drying under a specific temperature condition, and cutting into positive electrode plates with certain thickness and width. Then a groove 201 with the width of 1mm is formed on the surface of the positive plate by utilizing a scraper, the thickness of the second coating is 140 mu m, and then the tab is welded to obtain the first positive plate.
In example 2, a second positive plate was prepared, the main material of lithium cobaltate, the conductive agent and polyvinylidene fluoride were mixed and stirred according to a fixed ratio, then NMP (N-methyl-2-pyrrolidone) solvent was added to prepare positive slurry, the positive slurry was coated on the surface of the current collector 10, dried under a specific temperature condition, and then cut into positive plates with a certain thickness and width. Then a groove 201 with the width of 2mm is formed on the surface of the positive plate by utilizing a scraper, the thickness of the second coating is 100 mu m, and then the electrode lug is welded to obtain the second positive plate.
In example 3, a third positive plate was prepared, the main material of lithium cobaltate, the conductive agent and polyvinylidene fluoride were mixed and stirred according to a fixed ratio, then NMP (N-methyl-2-pyrrolidone) solvent was added to prepare positive slurry, the positive slurry was coated on the surface of the current collector 10, dried under a specific temperature condition, and then cut into positive plates with a certain thickness and width. Then a groove 201 with the width of 3mm is formed on the surface of the positive plate by using a scraper, the thickness of the second coating is 30 mu m, and then a third positive plate is obtained by welding the tab.
Comparative example 1, a comparative positive plate was prepared, a lithium cobaltate positive electrode main material, a conductive agent and polyvinylidene fluoride were mixed and stirred in a fixed ratio, then NMP (N-methyl-2-pyrrolidone) solvent was added to prepare a positive electrode slurry, the positive electrode slurry was coated on the surface of a current collector 10, dried under a specific temperature condition, cut into positive plates of a certain thickness and width, and then tabs were welded to obtain a comparative positive plate.
After the first positive plate, the second positive plate, the third positive plate and the comparison positive plate are obtained, all positive plates and negative plates of the lithium ion battery are manufactured into different battery cores, 0.2C/0.2C charge-discharge test of battery core capacity is carried out at 25 ℃, the energy density of the battery is calculated according to the capacity, voltage, thickness, width and height, the cycle performance of 3C/1C at 25 ℃ is tested, the battery is disassembled under different cycle times to confirm the lithium precipitation condition at the position of the battery tab, and the disassembly experimental result is as follows:
it can be seen from the above table that the first groove 201, the second groove 201 and the third groove 201 with different widths and the second coating with different thicknesses are arranged on the positive electrode smear, so that the energy density of the battery is effectively improved, the capacity retention rate of the battery is ensured, the deformation problem of the lithium ion battery is further improved, and the service life of the lithium ion battery is prolonged on the premise of effectively reducing the lithium precipitation condition of the edge of the protective layer 40.
As an alternative embodiment, the first coating 20 includes a covered region covered by the protective layer 40 and a non-covered region connected to the covered region by the second coating 30;
the groove 201 is formed to be recessed inward from one side surface of the first coating layer 20, and the groove 201 is disposed around the covered area.
In this embodiment, when the protective layer 40 is provided at a position corresponding to the battery negative electrode tab, the protective layer 40 may be positioned inside the first coating layer 20 in a polygonal manner. In order to ensure that lithium precipitation on each side of the protection layer 40 is effectively controlled, the groove 201 is arranged to be matched with the edge of the protection layer 40 to effectively prevent lithium precipitation, and meanwhile, the size of the groove is matched with the size of the negative electrode tab, so that the area where the groove is located is limited, the influence on the battery capacity and the charging speed of the battery loaded with the positive electrode plate is avoided, and the charging and discharging performance of the battery is considered.
As an alternative embodiment, the projection of the groove 201 on the current collector 10 is in a U shape, V shape, arc shape, right trapezoid shape or triangle shape;
the width of the groove 201 is 1-3mm.
In this embodiment, too large a width of the groove 201 similarly to the width of the second coating layer 30 causes a decrease in battery energy density, while too small a width causes a problem that lithium precipitation of the battery cannot be effectively controlled. In the embodiment of the invention, the width of the groove 201 is set to be 1-3mm, so that the purpose of preventing lithium precipitation can be realized while the energy density of the battery is ensured.
Wherein the shape design of the protective layer 40 is also different according to different process and production requirements. The shape of the groove 201 may be set to be U-shaped, mouth-shaped, X-shaped, Z-shaped or field-shaped accordingly at this time to fit different types of protective layers 40.
As an alternative embodiment, the protective layer 40 includes a first side and a second side disposed opposite to each other in the length direction of the positive electrode sheet, and the distance between the first side of the protective layer 40 and the edge of the corresponding covering region is L 1 The distance between the second side edge of the protective layer 40 and the edge of the corresponding coverage area is L 2 ，|L 1 -L 2 The range of I is 0-2mm.
In this embodiment, the production conditions and the like are usedThe size of the protective layer 40 may fluctuate within a certain range due to factors, and in order to accurately locate the edge of the protective layer 40 in the non-coverage area while ensuring a certain effect of suppressing precipitation of lithium, it is necessary to add |L 1 -L 2 The range of I is set to 0-2mm. Under the condition, the lithium precipitation can be well inhibited.
The embodiment of the application also provides a battery, which comprises the positive plate, wherein the protective layer 40 and the groove 201 are positioned at the tail end of the positive plate.
It should be noted that, the implementation manner of the above-mentioned positive electrode plate embodiment is also applicable to the embodiment of the battery, and the same technical effects can be achieved, which is not described herein again.
The embodiment of the application also provides a battery, which comprises the positive plate, a negative plate and a negative electrode lug fixed on the surface of the negative plate, wherein the protective layer 40 and the groove 201 are positioned at the position of the positive plate corresponding to the negative electrode lug.
It should be noted that, the implementation manner of the above-mentioned positive electrode plate embodiment is also applicable to the embodiment of the battery, and the same technical effects can be achieved, which is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (11)
1. A positive electrode sheet, comprising: a current collector, a first coating, a second coating and a protective layer, wherein,
the first coating is coated on the surface of the current collector, a groove is formed in the surface of the first coating, the bottom surface of the groove is covered by the second coating, and the thickness of the second coating is smaller than that of the first coating;
the protective layer is arranged on the surface of the first coating, the projection of part of the edge of the protective layer on the current collector is positioned in the second coating, and the width of the groove is 1-3mm.
2. The positive electrode sheet of claim 1, wherein the thickness of the second coating layer ranges from 10 to 150 μm.
3. The positive electrode sheet of claim 1, wherein the first coating layer comprises a covered region covered by the protective layer and a non-covered region connected to the covered region by the second coating layer;
the distance between the edge of the non-covering area close to the protective layer and the edge of the protective layer close to the non-covering area is 0-3mm.
4. The positive electrode sheet of claim 1, wherein the second coating has a planar, stepped or arcuate cross-sectional shape.
5. The positive electrode sheet according to claim 1, wherein the second coating layer communicates with opposite sides of the current collector in a width direction of the positive electrode sheet.
6. The positive electrode sheet according to claim 1, wherein the shape of the groove is a wavy line type, a folded line type, or a linear type.
7. The positive electrode sheet of claim 1, wherein the first coating layer comprises a covered region covered by the protective layer and a non-covered region connected to the covered region by the second coating layer;
the groove is formed by recessing inwards from one side surface of the first coating, and the groove is arranged around the coverage area.
8. The positive plate of claim 7, wherein the projection of the groove on the current collector is in a U-shape, a V-shape, an arc shape, a right trapezoid shape or a triangle shape;
the width of the groove is 1-3mm.
9. The positive electrode sheet according to claim 7, wherein the protective layer includes a first side and a second side which are disposed opposite to each other in a length direction of the positive electrode sheet, and a distance between the first side of the protective layer and an edge of a corresponding covering region thereof is L 1 The distance between the second side edge of the protective layer and the edge of the corresponding coverage area is L 2 ，|L 1 -L 2 The range of I is 0-2mm.
10. A battery comprising the positive electrode sheet according to any one of claims 1 to 9, wherein the protective layer and the groove are located at the end of the positive electrode sheet.
11. A battery, characterized in that the battery comprises the positive plate as claimed in any one of claims 1-9, and further comprises a negative plate and a negative tab fixed on the surface of the negative plate, wherein the protective layer and the groove are positioned at the position of the positive plate corresponding to the negative tab.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108713271A (en) * | 2016-06-27 | 2018-10-26 | 宁德时代新能源科技股份有限公司 | Battery core and the battery for using this battery core |
| CN212848492U (en) * | 2020-08-04 | 2021-03-30 | 珠海冠宇电池股份有限公司 | Pole piece and lithium ion battery |
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| WO2021195907A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Electrochemical apparatus and electronic apparatus |
| CN211670270U (en) * | 2020-04-07 | 2020-10-13 | 北京小米移动软件有限公司 | Battery and electronic equipment |
| CN111540909A (en) * | 2020-05-21 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
| CN111952541B (en) * | 2020-09-14 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Positive plate, preparation method and battery |
| CN112750978B (en) * | 2020-12-30 | 2022-03-15 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN214378501U (en) * | 2021-03-01 | 2021-10-08 | 珠海冠宇电池股份有限公司 | Pole piece and lithium ion battery |
| CN214589165U (en) * | 2021-04-30 | 2021-11-02 | 珠海冠宇电池股份有限公司 | Battery cell and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108713271A (en) * | 2016-06-27 | 2018-10-26 | 宁德时代新能源科技股份有限公司 | Battery core and the battery for using this battery core |
| CN212848492U (en) * | 2020-08-04 | 2021-03-30 | 珠海冠宇电池股份有限公司 | Pole piece and lithium ion battery |
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