CN220209012U - Battery pole piece and winding battery - Google Patents
Battery pole piece and winding battery Download PDFInfo
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- CN220209012U CN220209012U CN202321756052.2U CN202321756052U CN220209012U CN 220209012 U CN220209012 U CN 220209012U CN 202321756052 U CN202321756052 U CN 202321756052U CN 220209012 U CN220209012 U CN 220209012U
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- organic coating
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- active material
- pole piece
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- 239000003792 electrolyte Substances 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 114
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- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 17
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 7
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 7
- XJYDIOOQMIRSSY-UHFFFAOYSA-N 1,3,2-dioxathiepane 2-oxide Chemical compound O=S1OCCCCO1 XJYDIOOQMIRSSY-UHFFFAOYSA-N 0.000 claims description 5
- WDXYVJKNSMILOQ-UHFFFAOYSA-N 1,3,2-dioxathiolane 2-oxide Chemical compound O=S1OCCO1 WDXYVJKNSMILOQ-UHFFFAOYSA-N 0.000 claims description 5
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 5
- GWAOOGWHPITOEY-UHFFFAOYSA-N 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCO1 GWAOOGWHPITOEY-UHFFFAOYSA-N 0.000 claims description 5
- MXUZSNPHTRQMGP-UHFFFAOYSA-N 4-hydroxybutyl hydrogen sulfate Chemical compound OCCCCOS(O)(=O)=O MXUZSNPHTRQMGP-UHFFFAOYSA-N 0.000 claims description 5
- OQXNUCOGMMHHNA-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2,2-dioxide Chemical compound CC1COS(=O)(=O)O1 OQXNUCOGMMHHNA-UHFFFAOYSA-N 0.000 claims description 5
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- BDUPRNVPXOHWIL-UHFFFAOYSA-N dimethyl sulfite Chemical compound COS(=O)OC BDUPRNVPXOHWIL-UHFFFAOYSA-N 0.000 claims description 5
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 abstract description 15
- 238000001764 infiltration Methods 0.000 abstract description 15
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- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 36
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- -1 N' -thiodiimidazole Chemical compound 0.000 description 4
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- 229910021641 deionized water Inorganic materials 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- PNGLEYLFMHGIQO-UHFFFAOYSA-M sodium;3-(n-ethyl-3-methoxyanilino)-2-hydroxypropane-1-sulfonate;dihydrate Chemical compound O.O.[Na+].[O-]S(=O)(=O)CC(O)CN(CC)C1=CC=CC(OC)=C1 PNGLEYLFMHGIQO-UHFFFAOYSA-M 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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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
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model provides a battery pole piece and a winding battery, the battery pole piece comprises a current collector, an active material layer is arranged on the surface of at least one side of the current collector, the current collector is provided with a length direction, an organic coating is arranged on the surface of the active material layer on at least one side of the current collector, and the organic coating is positioned at one end of the current collector along the length direction; the organic coating is capable of dissolving in the electrolyte and/or melting to a liquid state when its temperature is raised to a melting point. The battery pole piece can solve or improve the problems of slow electrolyte infiltration, difficult heat dissipation of the battery core, unreleasable expansion stress of the battery core and the like in the wound battery.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery pole piece and a winding battery.
Background
As the high capacity requirements of the cells increase, increasing the size of the wound cells is a trend of current technology options, but increasing the size of the wound cells makes electrolyte infiltration more difficult. The driving force of electrolyte infiltration in the battery core is capillary force, and the electrolyte infiltration is a spontaneous infiltration process, and the membrane is larger than the electrode plate infiltration of the electrolyte, so that the electrolyte is preferentially transmitted in the pores of the membrane, and then diffuses to the positive and negative electrode plates at two sides through the membrane and infiltrates into the inner pores of the electrode plates, thereby completing the whole infiltration process. In small-size cells, this wetting process can be essentially completed in a short time, but in large-size cells, this process can become very slow, and even insufficient wettability can be ensured, thereby significantly affecting the performance of the product. Secondly, due to the increase of the radial dimension of the winding battery core, the tightness of the battery core is increased, heat generated by the battery core in the working process is more difficult to dissipate, and the expansion stress of the battery core is also more difficult to release.
Disclosure of Invention
The utility model aims to provide a battery pole piece, a wound battery and a preparation method thereof, which can solve or improve the problems of slow electrolyte infiltration, difficult heat dissipation of a battery core, unreleasable expansion stress of the battery core and the like in the wound battery.
The utility model provides a battery pole piece, which is used for winding a battery, and comprises a current collector, wherein an active material layer is arranged on the surface of at least one side of the current collector, the current collector is provided with a length direction, an organic coating is arranged on the surface of the active material layer on at least one side of the current collector, and the organic coating is positioned at one end of the current collector along the length direction; the organic coating is capable of dissolving in the electrolyte and/or melting to a liquid state when its temperature is raised to a melting point.
In one implementation, the organic coating is located near a winding start of the current collector when the battery pole piece is wound in the length direction.
In one realisable form, the area of the organic coating in contact with the active material layer in which it is located is 3% to 50% of the surface area of the active material layer in which it is located.
In one possible manner, the thickness of the organic coating is less than or equal to 10 μm.
In one possible manner, the active material layer is provided on the surface of the current collector side, and the organic coating layer is provided on the surface of the active material layer;
or the active material layers are arranged on the surfaces of the two opposite sides of the current collector, the organic coating is arranged on the surface of the active material layer on one side of the current collector, or the organic coating is arranged on the surface of the active material layer on the two opposite sides of the current collector.
In one implementation, the surface of the active material layer on at least one side of the current collector is provided with one organic coating, and the organic coating and the active material layer are both rectangular structures; the current collector further has a width direction along which a ratio of a width of the organic coating layer to a width of the active material layer is (1:2) to (1:1); the length of the organic coating layer along the length direction is not more than 1/2 of the length of the active material layer.
In one embodiment, the surface of the active material layer on at least one side of the current collector is provided with a plurality of organic coatings, which are arranged at intervals on the surface of the active material layer and/or next to one another.
In one implementation, the organic coating is a fluoroethylene carbonate layer, a dimethyl carbonate layer, a diethyl carbonate layer, a methylethyl carbonate layer, a ethylene carbonate layer, a 1, 3-propane sultone layer, a 1, 4-butanediol sulfate layer, an N, N' -thiodiimidazole layer, a methylene methane disulfonate layer, a butylene sulfite layer, a propylene sulfate layer, a dimethyl sulfite layer, a ethylene carbonate layer, a ethylene sulfate layer, an ethylene carbonate layer, or a ethylene sulfite layer.
In one implementation, the battery pole piece is a positive pole piece and/or a negative pole piece.
The utility model also provides a winding battery, which comprises a positive plate and a negative plate, wherein the positive plate and/or the negative plate is the battery plate.
The utility model also provides a preparation method of the winding battery, which comprises the following steps:
s10: providing a positive plate and a negative plate, wherein the positive plate and/or the negative plate is a battery plate as described above;
s20: overlapping the positive plate, the negative plate and the diaphragm and then winding to form a winding core; when in winding, the organic coating on the positive plate and/or the negative plate is positioned at the winding starting end of the positive plate and/or the negative plate, so that the organic coating on the positive plate and/or the negative plate is positioned at the center of the winding core after the winding is completed;
s30: injecting liquid after the winding core is put into a shell, and then eliminating the organic coating on the winding core to form gaps between the positive plate and the diaphragm and/or between the negative plate and the diaphragm; or after the winding core is put into the shell, heating the organic coating on the winding core to form a gap between the positive plate and the diaphragm and/or between the negative plate and the diaphragm, and then injecting liquid.
In one implementation manner, in the step S30, the removing the organic coating on the winding core specifically includes: subjecting the winding core to standing, heating and/or pressurizing treatment so as to dissolve the organic coating on the winding core in electrolyte; and/or heating the winding core to heat the organic coating on the winding core to the melting point and melt the organic coating into a liquid state.
According to the battery pole piece, the organic coating is arranged on the surface of the active material layer, and the organic coating can be dissolved in electrolyte and/or melted into a liquid state when the temperature of the organic coating is raised to the melting point; when the battery pole piece and the diaphragm form a winding core through winding, one end of the battery pole piece, which is provided with an organic coating, can be set as a winding starting end, so that the organic coating is positioned at the central position of the winding core after winding is completed, and can be dissolved in electrolyte and/or melted into liquid state when the temperature of the electrolyte rises to a melting point during subsequent liquid injection, and a gap can be formed between the battery pole piece and the diaphragm after the organic coating disappears, and the gap can improve the axial capillary force of the winding core, and simultaneously is convenient for the electrolyte to diffuse along the radial direction from the winding center of the winding core, so that the wetting speed of the electrolyte to the winding core is increased. On the other hand, the space left after the disappearance of the organic coating can relieve the stress change generated in the circulation process of the winding core, so that the expansion stress of the winding core can be released, and meanwhile, the heat dissipation of the winding core in the working process can be quickened, so that the electric performance and the safety performance of the winding battery can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pole piece in an embodiment of the utility model.
Fig. 2 is a schematic cross-sectional view of fig. 1 at A-A.
Fig. 3 is a schematic cross-sectional view of fig. 1 at a position along B-B.
Fig. 4 is a schematic structural view of a battery pole piece according to another embodiment of the present utility model.
Fig. 5 is a schematic structural view of a battery pole piece according to another embodiment of the present utility model.
Fig. 6 is a schematic structural view of a battery pole piece according to another embodiment of the present utility model.
Fig. 7 is a schematic structural view of a battery pole piece according to another embodiment of the present utility model.
Fig. 8 is a schematic structural view of a winding core according to an embodiment of the present utility model.
Fig. 9 is a schematic cross-sectional view of fig. 8.
Fig. 10 is a graph showing the temperature change trend of the batteries at the time of discharging in the examples and comparative examples of the present utility model.
Fig. 11 is a graph showing the change in the retention rate of the battery during cyclic charge and discharge in examples of the present utility model and comparative examples.
In the figure: 1-battery pole piece, 11-current collector, 111-coating area, 112-empty foil area, 12-active material layer, 13-organic coating layer, 100-winding core.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The terms upper, lower, left, right, front, rear, top, bottom and the like (if any) in the description and in the claims are used for descriptive purposes and not necessarily for describing relative positions of structures in the figures and in describing relative positions of structures. It should be understood that the use of directional terms should not be construed to limit the scope of the utility model as claimed.
As shown in fig. 1 to 3, a battery pole piece 1 provided in an embodiment of the present utility model is used for winding a battery. The battery pole piece 1 comprises a current collector 11, and an active material layer 12 is arranged on the surface of at least one side of the current collector 11. The current collector 11 has a rectangular structure, and the current collector 11 has a length direction L and a width direction W. In the width direction W, the current collector 11 includes a coating region 111 and an empty foil region 112 that are sequentially disposed, the active material layer 12 is disposed on the surface of the coating region 111, and the active material layer 12 is not disposed on the surface of the empty foil region 112; the empty foil region 112 is used to form a tab (not shown) by cutting. An organic coating layer 13 is arranged on the surface of the active material layer 12 on at least one side of the current collector 11, and the organic coating layer 13 is positioned at one end of the current collector 11 along the length direction L; the organic coating 13 can be dissolved in the electrolyte and/or melt to a liquid state when its temperature is raised to a melting point.
As an embodiment, the battery pole piece 1 is wound along the length direction L, and the organic coating layer 13 is located at the winding start end of the current collector 11 near the battery pole piece 1, that is, when the battery pole piece 1 is wound, it starts to be wound from the winding start end; after the battery pole piece 1 and the separator are wound to form the winding core 100, the winding start end of the battery pole piece 1 is positioned at the inner side (i.e. winding center) of the winding core 100, so that the organic coating 13 on the battery pole piece 1 is positioned at the center of the winding core 100.
Specifically, the battery pole piece 1 provided in this embodiment is formed by disposing the organic coating layer 13 on the surface of the active material layer 12, and the organic coating layer 13 is capable of dissolving in the electrolyte and/or melting into a liquid state when the temperature thereof is raised to the melting point; when the battery pole piece 1 and the diaphragm (not shown) are wound to form the winding core 100 (the specific structure of the winding core 100 can be referred to fig. 8 and 9), one end of the battery pole piece 1 provided with the organic coating 13 can be set as a winding starting end, so that the organic coating 13 is positioned at the central position of the winding core 100 after winding is completed (the central position of the winding core 100 is more difficult to obtain electrolyte infiltration than other positions of the winding core 100), during subsequent liquid injection, the organic coating 13 on the battery pole piece 1 can be dissolved in the electrolyte and/or melt into a liquid state when the temperature of the electrolyte rises to a melting point (before liquid injection, the organic coating 13 is still solid), a gap can be formed between the battery pole piece 1 and the diaphragm after the organic coating 13 disappears, the capillary force in the axial direction of the winding core 100 can be improved, meanwhile, the electrolyte is convenient to diffuse from the winding center of the winding core 100 along the radial direction, the infiltration speed of the electrolyte to the winding core 100 is increased, the infiltration time of the electrolyte to the winding core 100 is shortened, and the manufacturing efficiency is improved; further, since the gap is located at the center of the winding core 100, the winding core 100 is not deformed and relaxed. Meanwhile, the space left after the organic coating 13 disappears can relieve the stress change of the winding core 100 in the circulation process, so that the expansion stress of the winding core 100 can be released, and meanwhile, the heat dissipation of the winding core 100 in the working process can be quickened, so that the electrical property and the safety property of the winding battery can be improved.
As an embodiment, the organic coating layer 13 may be disposed on the surface of the active material layer 12 by coating, spraying, sputtering, hot pressing, attaching, or 3D printing, etc.
In one embodiment, the material of the organic coating layer 13 is fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethylene carbonate, 1, 3-propane sultone, 1, 4-butanediol sulfate, N' -thiodiimidazole, methylene methane disulfonate, butylene sulfite, propylene sulfate, dimethyl sulfite, ethylene carbonate, ethylene sulfate, ethylene carbonate, or ethylene sulfite. The above material can be dissolved in the electrolyte and/or melted into a liquid state when the temperature of the organic coating layer 13 is raised to the melting point, and new impurities are not introduced into the electrolyte after the dissolution.
As one embodiment, the organic coating layer 13 is a fluoroethylene carbonate layer, a dimethyl carbonate layer, a diethyl carbonate layer, a methylethyl carbonate layer, a ethylene carbonate layer, a 1, 3-propane sultone layer, a 1, 4-butanediol sulfate layer, an N, N '-thiodiimidazole layer, a methylene methane disulfonate layer, a butylene sulfite layer, a propylene sulfate layer, a dimethyl sulfite layer, a ethylene carbonate layer, or a ethylene sulfite layer, i.e., the material of the organic coating layer 13 is fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethylene carbonate, 1, 3-propane sultone, 1, 4-butanediol sulfate, N' -thiodiimidazole, methylene methane disulfonate, butylene sulfite, propylene sulfate, dimethyl sulfite, ethylene carbonate, ethylene sulfate, ethylene carbonate, or ethylene sulfite.
In one embodiment, the material of the organic coating 13 is Vinylene Carbonate (VC), and the organic coating 13 is a vinylene carbonate layer. The melting point of Vinylene Carbonate (VC) is 19-22 ℃, and the physical state of the Vinylene Carbonate (VC) can be regulated by controlling the temperature, so that the coating is facilitated; and the Vinylene Carbonate (VC) belongs to one of important additives in the electrolyte, so that the electrolyte without VC can be used for injection during injection, and the Vinylene Carbonate (VC) is supplemented into the electrolyte after the organic coating 13 is dissolved. The specific operation steps of this embodiment may be: the ethylene carbonate (VC) is melted into liquid state by a heatable coating nozzle, then the pole piece is coated, the pole piece is directly wound after the coating is finished, and the winding ambient temperature is not more than 15 ℃ (the coating layer is ensured to be solid so as to be wound). The prepared winding battery is placed in an environment of 35-40 ℃ for standing for 24-48 hours after electrolyte is injected, vinylene Carbonate (VC) is melted at 35-40 ℃ and is mixed with the electrolyte into a whole, fine pores are reserved between a pole piece and a diaphragm, the infiltration of the electrolyte is further promoted, and the operation can also avoid dropping of the coated Vinylene Carbonate (VC) caused by excessive working procedures. The coating equipment used in the embodiment only needs to add a heating device on the existing coating equipment so as to enable the coating equipment to be suitable for liquid coating of Vinylene Carbonate (VC), and the operation is simple.
As shown in fig. 1, as an embodiment, the area of the organic coating layer 13 in contact with the active material layer 12 where it is located is 3% to 50% of the surface area of the active material layer 12 where it is located, that is, the surface area of the organic coating layer 13 is 3% to 50% of the surface area of the coating region 111 where it is located. For example, the organic coating layer 13 is disposed on the active material layer 12 on the upper surface of the current collector 11, and the surface area of the organic coating layer 13 is 3% to 50% of the surface area of the active material layer 12 on the upper surface of the current collector 11.
As another embodiment, the area of the organic coating layer 13 in contact with the active material layer 12 where it is located is 5% to 45%, or 8% to 40%, or 10% to 38%, or 13% to 35%, or 15% to 30%, or 20% to 27% of the surface area of the active material layer 12 where it is located.
As one embodiment, the thickness of the organic coating 13 is less than or equal to 10 μm.
As another embodiment, the thickness of the organic coating layer 13 is 1 μm to 8 μm, or 1 μm to 5 μm, or 1 μm to 2 μm.
As shown in fig. 1 to 3, as one embodiment, active material layers 12 are provided on surfaces of opposite sides of a current collector 11, and an organic coating layer 13 is provided on a surface of the active material layer 12 on one side of the current collector 11. Of course, in other embodiments, the organic coating layer 13 may be disposed on the surfaces of the active material layer 12 on opposite sides of the current collector 11; when the organic coating layers 13 are disposed on the surfaces of the active material layers 12 on opposite sides of the current collector 11, the organic coating layers 13 on the two sides are located at the same end of the current collector 11 along the length direction L, and the shapes and the areas of the organic coating layers 13 on the two sides may be the same or different.
As another embodiment, the active material layer 12 is provided on the surface of the current collector 11 on the side, and the organic coating layer 13 is provided on the surface of the active material layer 12 on the side.
As shown in fig. 1 to 3, as an embodiment, one organic coating layer 13 is provided on the surface of the active material layer 12 on at least one side of the current collector 11, and the one organic coating layer 13 and the active material layer 12 are each rectangular in structure. The ratio of the width W1 of the organic coating layer 13 to the width W2 of the active material layer 12 in the width direction W is (1:2) to (1:1); or the ratio of the width W1 of the organic coating layer 13 to the width W2 of the active material layer 12 is (3:5) to (4:5). In the longitudinal direction L, the length L1 of the organic coating layer 13 does not exceed 1/2 of the length L2 of the active material layer 12; or the length L1 of the organic coating layer 13 is 1/10 to 1/3 of the length L2 of the active material layer 12; or the length L1 of the organic coating layer 13 is 1/8 to 1/4 of the length L2 of the active material layer 12.
As shown in fig. 1 and 3, as one embodiment, the ratio of the width W1 of the organic coating layer 13 to the width W2 of the active material layer 12 in the width direction W is 1:1, i.e. the width W1 of the organic coating 13 is equal to the width W2 of the active material layer 12. As another embodiment, as shown in fig. 4, the width W1 of the organic coating layer 13 is smaller than the width W2 of the active material layer 12 in the width direction W.
As another embodiment, as shown in fig. 5, a plurality of organic coating layers 13 are provided on the surface of the active material layer 12 on at least one side of the current collector 11, and the plurality of organic coating layers 13 are provided at intervals on the surface of the active material layer 12. Each of the organic coating layers 13 has a rectangular structure, each of the organic coating layers 13 is disposed to extend in the width direction W, and a plurality of the organic coating layers 13 are disposed to be spaced apart in the length direction L.
As another embodiment, as shown in fig. 6, a plurality of organic coating layers 13 are provided on the surface of the active material layer 12 on at least one side of the current collector 11, and the plurality of organic coating layers 13 are provided at intervals on the surface of the active material layer 12. Each of the organic coating layers 13 has a rectangular structure, each of the organic coating layers 13 is disposed to extend in the longitudinal direction L, and a plurality of the organic coating layers 13 are disposed to be spaced apart in the width direction W.
As shown in fig. 7, as another embodiment, a plurality of organic coating layers 13 are provided on the surface of the active material layer 12 on at least one side of the current collector 11, the plurality of organic coating layers 13 being disposed next to each other on the surface of the active material layer 12, each organic coating layer 13 having a circular structure. Of course, in other embodiments, the organic coating 13 may also have other shapes, such as triangular, trapezoidal, shaped, etc.; among the plurality of organic coatings 13, a part of the organic coatings 13 are disposed with a space therebetween, and another part of the organic coatings 13 are disposed next to each other.
As an embodiment, the organic coating 13 on the battery pole piece 1 may be dissolved in the electrolyte and/or melted into a liquid state when its temperature is raised to the melting point by a treatment such as standing, heating and/or pressurizing.
As an embodiment, the battery electrode sheet 1 is a positive electrode sheet and/or a negative electrode sheet.
The embodiment of the utility model also provides a wound battery, which comprises a positive plate and a negative plate, wherein the positive plate and/or the negative plate is the battery plate 1.
The embodiment of the utility model also provides a preparation method of the wound battery, which comprises the following steps:
s10: providing a positive plate (not shown) and a negative plate (not shown), wherein the positive plate and/or the negative plate is the battery plate 1;
s20: as shown in fig. 8 and 9, the positive electrode sheet, the negative electrode sheet and the separator (not shown) are stacked and wound to form a winding core 100; when the winding is performed, the organic coating 13 on the positive plate and/or the negative plate is positioned at the winding starting end (namely, when the organic coating 13 is arranged on the positive plate, the organic coating 13 on the positive plate is positioned at the winding starting end of the positive plate, and/or when the organic coating 13 is arranged on the negative plate, the organic coating 13 on the negative plate is positioned at the winding starting end of the negative plate), so that the organic coating 13 on the positive plate and/or the negative plate is positioned at the central position of the winding core 100 (namely, the winding center of the winding core 100) after the winding is completed;
s30: filling liquid after the winding core 100 is put into a shell, and then eliminating the organic coating 13 on the winding core 100 to form gaps between the positive electrode plate and the diaphragm and/or between the negative electrode plate and the diaphragm; or after the winding core 100 is put into a shell, heating the organic coating 13 on the winding core 100 to form gaps between the positive electrode plate and the diaphragm and/or between the negative electrode plate and the diaphragm, and then injecting liquid; and finally, sequentially performing formation, aging and capacity division to obtain the coiled battery.
In one embodiment, in the step S30, the specific step of performing the elimination treatment on the organic coating 13 on the winding core 100 includes: subjecting the winding core 100 to a standing, heating and/or pressurizing treatment so that the organic coating 13 on the winding core 100 is dissolved in the electrolyte; and/or heating the core 100 to heat the organic coating 13 on the core 100 to its melting point and melt it into a liquid state.
The specific preparation steps of the wound battery can be as follows:
(1) Preparation of a positive plate: positive electrode material, conductive agent 1, conductive agent 2 and binder 1 were mixed in the following manner (92-96): (0.5-2.5): (0.2-1): weighing the components in the weight ratio of (1.5-2.5), putting the components in NMP solvent, fully and uniformly stirring, coating the components on a positive plate after bubble removal, rolling, slitting and drying for use. The positive electrode main material comprises one or more of nickel cobalt lithium manganate, lithium cobaltate, lithium iron phosphate and lithium manganese iron phosphate, the conductive agent 1 is one or more of conductive carbon black and graphene, the conductive agent 2 is one or more of multi-wall carbon nanotubes and single-wall carbon nanotubes, and the binder 1 is one or more of PVDF with different molecular weights.
(2) Preparing a negative plate: the cathode main material, the conductive agent 3, the thickener and the binder 2 are mixed according to the following proportion (93-97): (0.5-1.2): (1.0-1.4): and (1.5-2.2) weighing the materials according to the weight ratio, putting the materials into deionized water, fully and uniformly stirring, coating the materials on a negative plate after bubble removal, rolling, slitting and drying the materials for later use. The negative electrode main material comprises one or more of artificial graphite, natural graphite and silicon oxide, the conductive agent 3 is one or more of conductive carbon black and graphene, the thickening agent is sodium hydroxymethyl cellulose, and the binder 2 is styrene-butadiene rubber aqueous solution.
(3) Before winding, coating Vinylene Carbonate (VC) on positive and negative pole pieces, wherein the specific operation steps are that the temperature of a coating machine head is adjusted to 30-40 ℃, so that the VC can be kept in a liquid state for convenient coating, the VC is coated on the cut pole pieces by adjusting the size of a knife edge, then the coated positive and negative pole pieces and a diaphragm are wound to obtain a winding core, the diaphragm completely separates the positive and negative pole pieces, the winding environment temperature is controlled to be not more than 15 ℃, the diaphragm is a polyolefin film coated with ceramic, the coating length of the VC on the pole pieces is not more than one third of that of the whole pole pieces, and the coating positions are all on the inner side of the winding core (because the inner side of a cylindrical battery core is slowest to infiltrate).
(4) And (3) after the wound winding core is put into a shell, injecting electrolyte without VC component, sealing, and placing in an environment with the temperature of 35-40 ℃ for 48h.
(5) And (5) performing formation, aging and capacity division to obtain the coiled battery.
According to the repairing method of the battery negative plate, the organic coating 13 is arranged on the surface of the active material layer 12, and the organic coating 13 can be dissolved in electrolyte and/or melted into a liquid state when the temperature of the organic coating is raised to the melting point; when the battery pole piece 1 and the diaphragm are wound to form the winding core 100, one end of the battery pole piece 1 provided with the organic coating 13 is set as a winding starting end, so that the organic coating 13 is positioned at the central position of the winding core 100 after winding is finished, and when liquid is injected later, the organic coating 13 on the battery pole piece 1 can be dissolved in electrolyte and/or melted into liquid state when the temperature of the electrolyte is raised to a melting point, a gap can be formed between the battery pole piece 1 and the diaphragm after the organic coating 13 disappears, the gap can improve the axial capillary force of the winding core 100, meanwhile, the electrolyte can be conveniently diffused from the winding center of the winding core 100 along the radial direction, the infiltration speed of the electrolyte to the winding core 100 is increased, the infiltration time of the electrolyte to the winding core 100 is shortened, and the manufacturing efficiency is improved; further, since the gap is located at the center of the winding core 100, the winding core 100 is not deformed and relaxed. Meanwhile, the space left after the organic coating 13 disappears can relieve the stress change of the winding core 100 in the circulation process, so that the expansion stress of the winding core 100 can be released, and meanwhile, the heat dissipation of the winding core 100 in the working process can be quickened, so that the electrical property and the safety property of the winding battery can be improved.
Examples
The specific preparation steps of the wound battery provided in this embodiment are:
(1) Preparation of a positive plate: weighing 19.00kg of lithium iron phosphate, 0.50kg of SP, 0.10kg of CNT and 0.40kg of PVDF, putting into 16.36kg of NMP solvent, fully stirring, coating the mixture on the surfaces of two sides of an aluminum foil with the thickness of 10 mu m after bubble removal, rolling and slitting to prepare a positive plate with the width of 450mm and the length of 80m, and drying for later use;
(2) Preparing a negative plate: weighing 19.20kg of artificial graphite, 0.16kg of SP, 0.24kg of CMC and 0.40kg of SBR, placing the materials in 16.36kg of deionized water, fully stirring, coating the materials on two sides of copper foil with the thickness of 6 mu m after removing bubbles, rolling and cutting the materials to prepare a negative plate with the width of 460mm and the length of 82m, and drying the negative plate for later use;
(3) Coating Vinylene Carbonate (VC) on one side of the positive plate cut in the step (1): placing VC in a coater, adjusting the temperature of the coater head to 35 ℃, passing the anode plate through the coater head, coating VC on the anode plate, and adjusting parameters to ensure that the thickness of the VC coating is about 1.5 mu m, wherein the width of a VC coating area is 400mm and the length is 20m according to the required 100gVC mass; simultaneously, VC is controlled to be coated at one end of the pole piece in the length direction, so that the coating layer is ensured to be positioned at the inner side of the winding core;
(4) And (3) assembling: winding the anode and cathode plates coated in the step (3) and a polyolefin diaphragm, wherein the diaphragm completely separates the anode and cathode plates, putting the wound winding core into a shell and welding, and controlling the environmental temperature to be 15-18 ℃ to ensure that the coating layer is kept solid;
(5) And (3) liquid injection: 3.9kg of lithium electrolyte containing 1mol/L hexafluorophosphoric acid is injected into the assembled battery cell, wherein the solvent of the electrolyte is ethylene carbonate and methyl ethyl carbonate (the mass ratio is 1:2), the additive is 0.5wt.% fluoroethylene carbonate, and the battery cell is placed in an environment of 40 ℃ for 4 days after the injection;
(6) And (3) forming, aging and capacity-dividing the battery core after liquid injection to obtain a coiled battery for standby.
Comparative example
The specific preparation steps of the wound battery provided in this comparative example were substantially the same as those of the above examples, except that the positive and negative electrode sheets were not coated with Vinylene Carbonate (VC), i.e., the present comparative example was free of the above step (3), while the liquid injection step was different from the above examples; the other steps are the same as in the above embodiment.
Specifically, at the time of injection, 4.0kg of lithium electrolyte containing 1mol/L hexafluorophosphoric acid was used, in which the solvents of the electrolyte were ethylene carbonate and ethylmethyl carbonate (mass ratio of 1:2), and the additives were 0.5wt.% fluoroethylene carbonate and 100gVC (the mass of VC was the same as that of the coating on the electrode sheet in the examples).
The wound batteries prepared in the above examples and comparative examples were subjected to an ac internal resistance test, a discharge temperature change test, and a cyclic charge-discharge retention rate change test, respectively.
The data of the ac internal resistance test are shown in the following table:
as can be seen from the above table, the wound battery of the example decreased in ac internal resistance (ACR) faster than the wound battery of the comparative example during the standing process, indicating that the electrolyte infiltration rate in the wound battery of the example was faster.
The wound batteries of the above examples and comparative examples were discharged at 0.33C, and the change in the battery surface temperature was measured, and the result is shown in fig. 10. As can be seen from fig. 10, the temperature rising rate of the wound battery of the embodiment is slower than that of the wound battery of the comparative example, which illustrates that the heat dissipation performance of the wound battery of the embodiment is better (a gap is formed between the battery pole piece and the separator after the VC coating layer is dissolved, thereby accelerating the heat dissipation of the battery cell and helping to improve the safety and the electrical performance of the battery).
The wound batteries of the above examples and comparative examples were subjected to cyclic charge and discharge at 25℃and 0.33℃to test the retention rate of the battery (i.e., retention rate of the battery capacity; the battery capacity retention rate means the ratio of the amount of the battery capacity after one battery was charged and discharged n times and the amount of the battery capacity in the full state when the battery was new) and the results are shown in FIG. 11. As can be seen from fig. 11, the wound battery of the example was reduced more slowly in retention than the wound battery of the comparative example, indicating that the wound battery of the example was better in electrical and cycle performance.
The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A battery pole piece for a wound battery, the battery pole piece (1) comprising a current collector (11), an active material layer (12) being provided on a surface of at least one side of the current collector (11), the current collector (11) having a length direction (L), characterized in that an organic coating (13) is provided on a surface of the active material layer (12) of at least one side of the current collector (11), the organic coating (13) being located at one end of the current collector (11) in the length direction (L); the organic coating (13) is capable of dissolving in an electrolyte and/or melting to a liquid state when its temperature is raised to a melting point.
2. A battery pole piece according to claim 1, characterized in that the organic coating (13) is located near the winding start end of the current collector (11) when the battery pole piece (1) is wound in the length direction (L).
3. A battery pole piece according to claim 1, characterized in that the area of the organic coating (13) in contact with the active material layer (12) in which it is located is 3-50% of the surface area of the active material layer (12) in which it is located.
4. A battery pole piece according to claim 1, characterized in that the thickness of the organic coating (13) is less than or equal to 10 μm.
5. The battery pole piece according to claim 1, characterized in that the active material layer (12) is provided on the surface of the current collector (11) side, and the organic coating (13) is provided on the surface of the active material layer (12);
or, the active material layers (12) are arranged on the surfaces of the two opposite sides of the current collector (11), the organic coating (13) is arranged on the surface of the active material layer (12) on one side of the current collector (11), or the organic coating (13) is arranged on the surface of the active material layer (12) on the two opposite sides of the current collector (11).
6. The battery pole piece according to claim 1, characterized in that the surface of the active material layer (12) on at least one side of the current collector (11) is provided with one organic coating (13), and the organic coating (13) and the active material layer (12) are both rectangular structures; the current collector (11) further has a width direction (W) along which a ratio of the width of the organic coating layer (13) to the width of the active material layer (12) is (1:2) to (1:1); the length of the organic coating layer (13) in the length direction (L) is not more than 1/2 of the length of the active material layer (12).
7. A battery pole piece according to claim 1, characterized in that the active material layer (12) on at least one side of the current collector (11) is provided with a plurality of said organic coating layers (13) on the surface thereof, the plurality of said organic coating layers (13) being arranged at intervals and/or next to each other on the surface of the active material layer (12).
8. The battery pole piece of claim 1, wherein the organic coating (13) is a fluoroethylene carbonate layer, a dimethyl carbonate layer, a diethyl carbonate layer, a methylethyl carbonate layer, a ethylene carbonate layer, a 1, 3-propane sultone layer, a 1, 4-butanediol sulfate layer, an N, N' -thiodiimidazole layer, a methylene methane disulfonate layer, a butylene sulfite layer, a propylene sulfate layer, a dimethyl sulfite layer, a ethylene carbonate layer, a ethylene sulfate layer, an ethylene carbonate layer, or a ethylene sulfite layer.
9. The battery pole piece according to claim 1, characterized in that the battery pole piece (1) is a positive pole piece and/or a negative pole piece.
10. A wound battery comprising a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and/or the negative electrode sheet is the battery sheet of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321756052.2U CN220209012U (en) | 2023-07-05 | 2023-07-05 | Battery pole piece and winding battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321756052.2U CN220209012U (en) | 2023-07-05 | 2023-07-05 | Battery pole piece and winding battery |
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