CN114447274B - Pole piece and battery - Google Patents
Pole piece and battery Download PDFInfo
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- CN114447274B CN114447274B CN202210127949.2A CN202210127949A CN114447274B CN 114447274 B CN114447274 B CN 114447274B CN 202210127949 A CN202210127949 A CN 202210127949A CN 114447274 B CN114447274 B CN 114447274B
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- 238000000576 coating method Methods 0.000 claims abstract description 105
- 239000011248 coating agent Substances 0.000 claims abstract description 101
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052744 lithium Inorganic materials 0.000 abstract description 12
- 238000001556 precipitation Methods 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 8
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 239000011247 coating layer Substances 0.000 description 21
- 238000000034 method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 4
- 238000007600 charging Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000011267 electrode slurry Substances 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention provides a pole piece and a battery, wherein the pole piece comprises: the device comprises a first current collector, a second current collector, a first coating, a second coating and a third coating, wherein the first coating is coated on the first surface of the first current collector, the second coating is coated on the second surface of the first current collector, and the first surface and the second surface of the first current collector are opposite; the first surface of the second current collector is attached to one side, far away from the first current collector, of the second coating, the third coating is coated on the second surface of the second current collector, and the first surface and the second surface of the second current collector are opposite; the second current collector is provided with a plurality of holes, and the holes are communicated with the second coating and the third coating. According to the embodiment of the invention, the second current collector and the third coating with the plurality of holes are arranged on the pole piece, so that the electron conduction rate is increased, the combined distance of lithium ions and electrons is shortened, and the polarization of the battery is reduced, thereby inhibiting the problem of lithium precipitation of the battery and prolonging the service life of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a pole piece and a battery.
Background
Lithium batteries are currently the main stream battery type with high energy density and high magnification that is widely used. As the capacity and energy density requirements of lithium batteries are continuously increasing in the field of application of the batteries, the related art performs corresponding compaction treatment on the materials of the batteries. However, in the related art, due to the increase of the transmission and the side length of the electric conduction path of lithium ions in the electric cycle process, polarization is generated in the battery, so that serious lithium precipitation occurs in the battery in the cycle process, and the battery is disabled.
As can be seen, the related art has a problem in that the battery severely separates lithium.
Disclosure of Invention
The embodiment of the invention provides a pole piece and a battery, which are used for solving the problem of serious lithium precipitation of the battery in the related technology.
To achieve the above object, an embodiment of the present invention provides a pole piece, including: a first current collector, a second current collector, a first coating, a second coating, and a third coating, wherein,
The first coating is coated on the first surface of the first current collector, the second coating is coated on the second surface of the first current collector, and the first surface and the second surface of the first current collector are opposite;
The first surface of the second current collector is attached to one side, far away from the first current collector, of the second coating, the third coating is coated on the second surface of the second current collector, and the first surface and the second surface of the second current collector are opposite;
The second current collector is provided with a plurality of holes, and the holes are communicated with the second coating and the third coating.
As an alternative embodiment, the first coating layer has a thickness of 20-100 μm, the second coating layer has a thickness of 20-100 μm, and the third coating layer has a thickness of 20-70 μm.
As an alternative embodiment, the pole piece further comprises a third current collector and a fourth coating, wherein the first surface of the third current collector is attached to one side of the first coating, which is far away from the first current collector, and the fourth coating is coated on the second surface of the third current collector, and the first surface and the second surface of the third current collector are opposite;
The third current collector is provided with a plurality of holes, and the holes are communicated with the first coating and the fourth coating.
As an alternative embodiment, the radius of the hole provided in the second current collector is 10-50mm, and the radius of the hole provided in the third current collector is 10-50mm.
As an alternative embodiment, the ratio of the total area of the plurality of holes provided by the second current collector to the area of the second current collector is not less than 0.5; the ratio of the total area of the plurality of holes arranged on the third current collector to the area of the third current collector is not less than 0.5.
As an alternative embodiment, the thickness of the first coating layer is 20-100 μm, the thickness of the second coating layer is 20-100 μm, the thickness of the third coating layer is 20-70 μm, and the thickness of the fourth coating layer is 20-70 μm.
As an alternative embodiment, the thickness of the first current collector is 5-8mm, the thickness of the second current collector is 5-8mm, and the thickness of the third current collector is 5-8mm.
As an alternative embodiment, the holes of the second current collector and/or the holes of the third current collector are perpendicular to the first current collector.
As an alternative embodiment, the cross-sectional shape of the hole of the second current collector and/or the hole of the third current collector is at least one of circular arc and polygonal.
The embodiment of the invention also provides a battery, which comprises the pole piece.
One of the above technical solutions has the following advantages or beneficial effects:
According to the embodiment of the invention, the second current collector and the third coating with the plurality of holes are arranged on the pole piece, so that the electron conduction rate is increased, the combined distance of lithium ions and electrons is shortened, and the polarization of the battery is reduced, thereby inhibiting the problem of lithium precipitation of the battery and prolonging the service life of the battery.
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 illustration of a pole piece according to an embodiment of the present invention;
FIG. 2 is a schematic view of another pole piece according to an embodiment of the present invention;
FIG. 3 is a graph of capacity retention versus cycle number provided by an embodiment of the present invention;
FIG. 4 is a graph of the relationship between the rate charge and the constant current charge ratio provided by the embodiment of the invention;
FIG. 5 is a schematic diagram of electrochemical impedance spectroscopy test results provided by an embodiment of the present invention.
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 embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, as shown in fig. 1, an embodiment of the present invention provides a pole piece, including: a first current collector 11, a second current collector 12, a first coating 21, a second coating 22, and a third coating 23, wherein,
The first coating 21 is coated on the first surface of the first current collector 11, the second coating 22 is coated on the second surface of the first current collector 11, and the first surface and the second surface of the first current collector 11 are opposite;
the first surface of the second current collector 12 is attached to one side of the second coating 22 away from the first current collector 11, and the third coating 23 is coated on the second surface of the second current collector 12, wherein the first surface and the second surface of the second current collector 12 are opposite;
the second current collector 12 is provided with a plurality of holes communicating the second coating 22 and the third coating 23.
In this embodiment, the second current collector 12 and the third coating 23 provided with a plurality of holes are arranged on the pole piece, so that the combined distance between lithium ions and electrons is shortened, the polarization of the battery is reduced, the problem of lithium precipitation of the battery is suppressed, and the effect of prolonging the service life of the battery is achieved.
Wherein the first current collector 11 and the second current collector 12 can conduct electrons simultaneously, so that the electron conduction rate can be effectively increased relative to that of a single current collector; meanwhile, the second coating 22 is arranged between the first current collector 11 and the second current collector 12, so that the combined distance of lithium ions and electrons is shortened.
The holes can conduct lithium ions, and lithium ions in the electrolyte can be conducted from the third coating 23 to the second coating 22 through the holes in the battery circulation process, so that the second coating 22 can be embedded and extracted with lithium ions, and normal electric circulation of the pole piece is realized.
As an alternative embodiment, the first coating 21 has a thickness of 20-100 μm, the second coating 22 has a thickness of 20-100 μm, and the third coating 23 has a thickness of 20-70 μm.
In this embodiment, the thickness of the first coating layer 21 is set to 20-100 μm, the thickness of the second coating layer 22 is set to 20-100 μm, and the thickness of the third coating layer 23 is set to 20-70 μm, so that the electronic conductivity of the battery can more satisfy the requirement of the cycle process of the battery.
Wherein, since the second coating layer 22 is disposed between the first current collector 11 and the second current collector 12, electrons of the second coating layer 22 are mainly combined with lithium ions provided by hole conduction of the second current collector 12, and the amount of lithium ions that can be provided to the second coating layer 22 by the hole decreases with increasing thickness of the third coating layer 23, the maximum thickness of the third coating layer 23 is smaller than the maximum thicknesses of the first coating layer 21 and the second coating layer 22 in the embodiment of the present invention.
As an alternative embodiment, as shown in fig. 2, the pole piece further includes a third current collector 13 and a fourth coating 24, wherein a first surface of the third current collector 13 is attached to a side of the first coating 21 away from the first current collector 11, the fourth coating 24 is coated on a second surface of the third current collector 13, and the first surface and the second surface of the third current collector 13 are opposite;
the third current collector 13 is provided with a plurality of holes communicating the first coating 21 and the fourth coating 24.
In this embodiment, by providing the third current collector 13 and the fourth coating 24 on the surface of the pole piece, the same effects as those of the second current collector 12 and the third coating 23 can be achieved, and the purposes of reducing polarization of the battery and inhibiting lithium precipitation of the battery are achieved, which will not be described herein.
As an alternative embodiment, the second current collector 12 is provided with holes having a radius of 10-50mm, and the third current collector 13 is provided with holes having a radius of 10-50mm.
In this embodiment, the radius of the hole formed in the second current collector 12 is set to be 10-50mm, and the radius of the hole formed in the third current collector 13 is set to be 10-50mm, so that lithium ions can be effectively conducted through each hole of the battery, and the surface coatings coated on the two sides of the first current collector 11 can be electrically circulated with lithium ions provided by hole conduction.
In addition, the radius of the hole formed in the second current collector 12 is set to be 10-50mm, and the radius of the hole formed in the third current collector 13 is set to be 10-50mm, so that a coating material of the third coating or the fourth coating can enter the hole in the coating process, and the situation that lithium ions cannot be conducted in the hole due to the fact that the hole cannot be filled is avoided.
As an alternative embodiment, the ratio of the total area of the plurality of holes provided by the second current collector 12 to the area of the second current collector 12 is not less than 0.5; the ratio of the total area of the plurality of holes provided in the third current collector 13 to the area of the third current collector 13 is not less than 0.5.
In this embodiment, since the second current collector 12 is disposed between the second coating 22 and the third coating 23, and the third current collector 13 is disposed between the first coating 21 and the fourth coating 24, the first coating 21 and the second coating 22 cannot directly contact with the electrolyte between the pole pieces, and the electrons of the first coating 21 and the second coating 22 are difficult to combine with the lithium ions between the pole pieces, and can only combine with the lithium ions provided by hole conduction, and the holes need to provide as sufficient lithium ions as possible to improve the cycle performance of the battery. In the embodiment of the present invention, the ratio of the total area of the plurality of holes provided in the second current collector 12 to the area of the second current collector 12 is set to be not less than 0.5; the ratio of the total area of the plurality of holes arranged on the third current collector 13 to the area of the third current collector 13 is set to be not less than 0.5, so that the holes can provide enough lithium ions for the cycle process of the battery, and the cycle performance of the battery is improved.
As an alternative embodiment, the first coating 21 has a thickness of 20-100 μm, the second coating 22 has a thickness of 20-100 μm, the third coating 23 has a thickness of 20-70 μm, and the fourth coating 24 has a thickness of 20-70 μm.
In this embodiment, as the current collectors are disposed on the surfaces of the first coating 21 and the second coating 22, the combination of the electrons of the first coating 21 and the second coating 22 and the lithium ions in the electrolyte between the electrode plates is blocked, and the lithium ions provided by hole conduction need to be electrically circulated. Since the number of lithium ions provided by hole conduction increases as the thickness of the electrode sheet is reduced in contact with the electrolyte, the maximum thickness of the first and second coatings 21 and 22 is greater than the maximum thickness of the third and fourth coatings 23 and 24 in the embodiment of the present invention. In the embodiment of the invention, the thickness of the first coating layer 21 is set to be 20-100 μm, the thickness of the second coating layer 22 is set to be 20-100 μm, the thickness of the third coating layer 23 is set to be 20-70 μm, and the thickness of the fourth coating layer 24 is set to be 20-70 μm, so that the electron conduction performance of the first current collector 11, the second current collector 12 and the third current collector 13 can be effectively exerted, and the cycle performance of the battery can be improved.
As an alternative embodiment, the thickness of the first current collector 11 is 5-8mm, the thickness of the second current collector 12 is 5-8mm, and the thickness of the third current collector 13 is 5-8mm.
In this embodiment, the thickness of the first current collector 11 is set to 5-8mm, the thickness of the second current collector 12 is set to 5-8mm, and the thickness of the third current collector 13 is set to 5-8mm, so that the electron conduction rate can meet the requirement of the battery cycle process. Meanwhile, the thickness of the first current collector 11 is set to be 5-8mm, the thickness of the second current collector 12 is set to be 5-8mm, and the thickness of the third current collector 13 is set to be 5-8mm, so that the pole piece can still keep a fixed form after being manufactured into a battery core, and the stability of the battery form is maintained in the use process of the battery.
As an alternative embodiment, the holes of the second current collector 12 and/or the holes of the third current collector 13 are perpendicular to the first current collector 11.
In this embodiment, the holes of the second current collector 12 and the holes of the third current collector 13 are perpendicular to the first current collector 11, so that the combination distance between lithium ions and electrons can be shortened, the electron conduction rate can be increased, and the effects of reducing battery polarization and suppressing battery lithium precipitation can be achieved.
As an alternative embodiment, the cross-sectional shape of the hole of the second current collector 12 and/or the hole of the third current collector 13 is at least one of circular arc and polygonal.
In the embodiment, the cross section of the hole can be one of circular arc and polygon according to different technological parameters, and the holes with different shapes can effectively increase the rate of electron conduction, so that the purposes of reducing battery polarization and inhibiting battery lithium precipitation are achieved.
In addition, the pole piece is one of a positive pole piece or a negative pole piece. The pole piece can be set as a positive pole piece or a negative pole piece, so that the battery polarization effect of the positive pole piece or the negative pole piece can be improved in the process of manufacturing the battery core, meanwhile, the electronic conductivity is enhanced, the combined distance of lithium ions and electrons is shortened, and the problem of lithium precipitation is solved.
In the process of manufacturing the battery cell, the electrode plate provided by the embodiment of the invention can be used as a positive electrode plate to be manufactured into the battery cell with a traditional negative electrode plate, the electrode plate provided by the embodiment of the invention can be used as a negative electrode plate to be manufactured into the battery cell with a traditional negative electrode plate, and the electrode plate provided by the embodiment of the invention can be used as a positive electrode plate to be manufactured into the battery cell with a negative electrode plate provided by the embodiment of the invention.
The embodiment of the application also provides a battery, which comprises the pole piece.
It should be noted that, the implementation manner of the above-mentioned pole piece embodiment is also suitable for the embodiment of the battery, and can achieve the same technical effects, which are not described herein again.
The embodiment of the application also provides electronic equipment comprising the battery.
It should be noted that, the implementation manner of the above battery embodiment is also applicable to the embodiment of the electronic device, and the same technical effects can be achieved, which is not described herein.
In the embodiment of the invention, the performance difference of the pole piece provided by the invention and the traditional pole piece is tested through a control test. The pole piece is used as a negative pole piece to be made into a battery for testing performance, and the preparation process is as follows:
Preparing a negative electrode material: adding a carbon material, a conductive agent, sodium carboxymethylcellulose (CMC), an emulsion of a styrene polymer (SBR) and water into a planetary stirring tank, wherein the mass ratio of active substances is 97%:0.5%:1.2%:1.3% of the anode slurry was prepared at 500r/min rotation and 2000r/min revolution.
Preparing a negative plate: coating the negative electrode slurry on the first surface of the first current collector, wherein the thickness of the coating is 20-100 mu m, and drying in an oven at 80-90 ℃; coating the negative electrode slurry on the second surface of the first current collector, wherein the thickness of the coating is 20-70 mu m, covering the second current collector on the surface of the coating, and drying in an oven at 80-90 ℃, and the second current collector is provided with holes; and finally, coating the negative electrode slurry on the surface of a second current collector, wherein the thickness of the coating is 20-100 mu m, and drying in an oven at 80-90 ℃ to obtain the negative electrode plate.
The prepared negative electrode sheet and positive electrode sheet were wound to prepare a battery as an example, and an electrical performance conventional test was performed using a conventional battery as a comparative example, and the results are shown in fig. 3. As can be seen from fig. 3, the embodiment can exhibit more excellent capacity retention during battery cycling than the comparative example, extending the service life of the battery.
The prepared negative electrode sheet and positive electrode sheet were wound to prepare a battery as an example, and a charging test was performed using a conventional battery as a comparative example, and the results are shown in fig. 4. As can be seen from fig. 4, the embodiment can achieve better rate charging with a larger rate charging-constant current charging ratio at the time of charging than the comparative example.
The prepared negative electrode sheet and positive electrode sheet were wound to prepare a battery as an example, and an electrochemical impedance spectrum test was performed using a conventional battery as a comparative example, and the results are shown in fig. 5. As can be seen from fig. 5, the impedance of the embodiment is significantly reduced relative to the comparative example, and the discharge performance is better.
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 (6)
1. A pole piece, comprising: a first current collector, a second current collector, a first coating, a second coating, and a third coating, wherein,
The first coating is coated on the first surface of the first current collector, the second coating is coated on the second surface of the first current collector, and the first surface and the second surface of the first current collector are opposite;
The first surface of the second current collector is attached to one side, far away from the first current collector, of the second coating, the third coating is coated on the second surface of the second current collector, and the first surface and the second surface of the second current collector are opposite;
the second current collector is provided with a plurality of holes, and the holes are communicated with the second coating and the third coating;
The solar cell module further comprises a third current collector and a fourth coating, wherein the first surface of the third current collector is attached to one side, far away from the first current collector, of the first coating, the fourth coating is coated on the second surface of the third current collector, and the first surface and the second surface of the third current collector are opposite;
the third current collector is provided with a plurality of holes, and the holes are communicated with the first coating and the fourth coating;
the ratio of the total area of the plurality of holes arranged on the second current collector to the area of the second current collector is not less than 0.5; the ratio of the total area of the plurality of holes arranged on the third current collector to the area of the third current collector is not less than 0.5;
The maximum thickness of the third coating is smaller than the maximum thickness of the first coating, and the maximum thickness of the third coating is smaller than the maximum thickness of the second coating;
The maximum thickness of the fourth coating is smaller than the maximum thickness of the first coating, and the maximum thickness of the fourth coating is smaller than the maximum thickness of the second coating;
The thickness of the first coating is 20-100 mu m, the thickness of the second coating is 20-100 mu m, the thickness of the third coating is 20-70 mu m, and the thickness of the fourth coating is 20-70 mu m.
2. The pole piece of claim 1, wherein the second current collector has a hole with a radius of 10-50mm and the third current collector has a hole with a radius of 10-50mm.
3. The pole piece of claim 1, wherein the first current collector has a thickness of 5-8 μm, the second current collector has a thickness of 5-8 μm, and the third current collector has a thickness of 5-8 μm.
4. Pole piece according to claim 1, characterized in that the holes of the second current collector and/or the holes of the third current collector are perpendicular to the first current collector.
5. The pole piece of claim 1, wherein the cross-sectional shape of the hole of the second current collector and/or the hole of the third current collector is at least one of circular arc-shaped and polygonal.
6. A battery comprising a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and/or the negative electrode sheet is the electrode sheet of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127949.2A CN114447274B (en) | 2022-02-11 | 2022-02-11 | Pole piece and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127949.2A CN114447274B (en) | 2022-02-11 | 2022-02-11 | Pole piece and battery |
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| Publication Number | Publication Date |
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| CN114447274A CN114447274A (en) | 2022-05-06 |
| CN114447274B true CN114447274B (en) | 2024-05-28 |
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| CN202210127949.2A Active CN114447274B (en) | 2022-02-11 | 2022-02-11 | Pole piece and battery |
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| CN113555522A (en) * | 2021-07-21 | 2021-10-26 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
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