CN219811630U - Diaphragm and method for manufacturing the same Battery cell - Google Patents
Diaphragm and method for manufacturing the same Battery cell Download PDFInfo
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- CN219811630U CN219811630U CN202221359588.6U CN202221359588U CN219811630U CN 219811630 U CN219811630 U CN 219811630U CN 202221359588 U CN202221359588 U CN 202221359588U CN 219811630 U CN219811630 U CN 219811630U
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- 238000004519 manufacturing process Methods 0.000 title 1
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- 239000011248 coating agent Substances 0.000 claims abstract description 117
- 239000011247 coating layer Substances 0.000 claims abstract description 36
- 239000002033 PVDF binder Substances 0.000 claims description 33
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- 239000000919 ceramic Substances 0.000 claims description 17
- 239000007774 positive electrode material Substances 0.000 claims description 17
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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
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- Cell Separators (AREA)
Abstract
The utility model provides a diaphragm and a battery, the diaphragm comprises: the diaphragm body is rectangular and comprises a base film and functional coatings arranged on one side or two opposite sides of the base film; the two edge coating combinations are respectively arranged at two opposite sides of the diaphragm main body, and each edge coating combination comprises two edge coating layers respectively positioned at two long edges of the diaphragm main body; each binding coating is coated on the base film, and the functional coating is positioned between the two binding coatings of the corresponding binding coating combination; wherein the thickness H1 of each binding coating is larger than the thickness H2 of the corresponding functional coating, the diaphragm main body and the two binding coating combinations jointly enclose two accommodation spaces respectively positioned at two opposite sides of the diaphragm main body, for respectively accommodating the positive electrode tab and the negative electrode tab, the lithium ion battery solves the problem that the lithium ion battery in the prior art is poor in high-temperature-resistant safety performance.
Description
Technical Field
The utility model relates to the technical field of lithium ion battery safety, in particular to a diaphragm and a battery.
Background
The new energy industry is actively developing, wherein the lithium ion power battery becomes a medium-fast green power energy of the electric automobile due to the advantages of high energy density, high output power, long cycle life and less pollution to the environment.
With the pursuit of long endurance, the safety problem of the battery with high energy density is increasingly prominent, and in recent years, the occurrence of accidents such as spontaneous combustion and explosion of the power battery caused by the safety problem occurs, which severely restricts the further development of the lithium ion battery in the field of electric automobiles.
When the lithium ion battery is out of control, the internal temperature of the battery can be quickly increased along with quick chain reaction heat release, and a common diaphragm is easily contracted at high temperature, so that the positive electrode and the negative electrode are in short circuit, the heat generation rate of the battery is increased, and even the ignition is performed to initiate combustion.
In the prior art, the separator is generally coated with a functional layer using a base film to improve the heat and shrink resistance of the separator, with a ceramic coating being one of the most common.
However, the prior functional layer only adopts a ceramic coating, the passing rate of the functional layer in a hot box high-temperature test is lower, this indicates that the heat-resistant safety of the battery in the prior art is poor.
Disclosure of Invention
The utility model mainly aims to provide a diaphragm and a battery, which are used for solving the problem that the lithium ion battery in the prior art is poor in high-temperature-resistant safety performance.
In order to achieve the above object, according to one aspect of the present utility model, there is provided a separator comprising: the diaphragm body is rectangular and comprises a base film and functional coatings arranged on one side or two opposite sides of the base film; the two edge coating combinations are respectively arranged at two opposite sides of the diaphragm main body, and each edge coating combination comprises two edge coating layers respectively positioned at two long edges of the diaphragm main body; each binding coating is coated on the base film, and the functional coating is positioned between the two binding coatings of the corresponding binding coating combination; the thickness H1 of each coating is larger than the thickness H2 of the corresponding functional coating, and the diaphragm main body and the two coating combinations enclose two containing spaces respectively located on two opposite sides of the diaphragm main body, so as to be used for containing the positive pole piece and the negative pole piece respectively.
Further, the membrane body and the edging coating are both coated with a polyvinylidene fluoride coating.
Further, the width B1 of each of the hemming coatings is 2mm to 10 mm; and/or the thickness H2 of each functional coating is 1 to 5 microns.
Further, the distance B2 between the pack Bian Tuceng and the negative electrode tab is 1 to 3 microns; and/or the distance B2 between the edge coating and the negative electrode plate is smaller than the distance B3 between the edge coating and the positive electrode plate; and/or the positive electrode plate comprises a positive electrode current collector and two layers of positive electrode active material coatings respectively arranged on two opposite sides of the positive electrode current collector, wherein the thickness of the edge coating is H1, the thickness of the diaphragm main body is H3, and the thickness of the positive electrode active material coating is H4; wherein H4 is more than or equal to H1 is more than or equal to 2H3.
Further, the base film comprises at least one of a high molecular polyethylene film, a high molecular polyethylene film coated with ceramic on one side, a high molecular polyethylene film coated with ceramic on both sides, a high molecular polypropylene film, a composite film of high molecular polypropylene and high molecular polyethylene, a polyimide film and a cellulose non-woven fabric.
Further, the functional coating comprises at least one of ceramic material, polyimide, cellulose non-woven fabric, aramid coating and polyvinylidene fluoride.
Further, the hemming coating slurry for forming the hemming coating includes ceramic powder, a binder, a dispersant, a thickener, a wetting agent, a surfactant, and a solvent.
Further, the ceramic powder includes at least one of boehmite, alumina, magnesia, and calcium oxide; median particle diameter D of ceramic powder 50 is 0.2 to 1.5 microns; and/or the binder comprises at least one of polyvinylidene fluoride, carboxymethyl cellulose, polyvinyl alcohol, and polyethylene carbonate; and/or the dispersing agent comprises at least one of polyoxyethylene dioleate, polyethylene glycol monostearate, polyacrylamide, polyethylene glycol and polyvinylpyrrolidone; and/or the thickener comprises at least one of polyacrylate copolymer emulsion, polymethacrylate copolymer emulsion, polymethacrylic acid emulsion and polyacrylic acid emulsion; and/or the solvent comprises at least one of water, ethanol, glycerol, dimethylformamide and dimethylacetamide.
Further, a thickness of the polyvinylidene fluoride coating is 0.05 to 0.3 of a sum of a thickness of the bag Bian Tuceng and a thickness of the polyvinylidene fluoride coating; and/or the polyvinylidene fluoride coating has a thickness of 1 to 3 microns; and/or polyvinylidene fluoride coating the vinylidene fluoride coating slurry comprises polyvinylidene fluoride binder, dispersant, surfactant and solvent.
According to another aspect of the utility model, there is provided a battery comprising a positive electrode sheet, a negative electrode sheet, an electrolyte and the separator described above, the separator being provided between the positive electrode sheet and the negative electrode sheet.
By applying the technical scheme of the utility model, the diaphragm comprises: the diaphragm body is rectangular and comprises a base film and functional coatings arranged on one side or two opposite sides of the base film; the two edge coating combinations are respectively arranged at two opposite sides of the diaphragm main body, and each edge coating combination comprises two edge coating layers respectively positioned at two long edges of the diaphragm main body; each binding coating is coated on the base film, and the functional coating is positioned between the two binding coatings of the corresponding binding coating combination; the thickness H1 of each coating is larger than the thickness H2 of the corresponding functional coating, and the diaphragm main body and the two coating combinations enclose two containing spaces respectively located on two opposite sides of the diaphragm main body, so as to be used for containing the positive pole piece and the negative pole piece respectively. Therefore, the diaphragm disclosed by the utility model has the advantages that the diaphragm main body is subjected to edge coating treatment to form an edge coating on the basis of not changing the structure of the diaphragm main body of the diaphragm of the conventional lithium ion battery, and the effect of inhibiting the diaphragm from shrinking into the space between the adjacent positive electrode plate and the negative electrode plate can be achieved when the battery is subjected to high temperature due to thicker edge coating while the conventional electric performance of the battery is not influenced; in addition, the edge coating layers of two adjacent diaphragms in the battery are adhered to each other, so that the effect of inhibiting the contraction of the diaphragms is achieved, the phenomenon of the contraction of the diaphragms caused by heating in the process of heat abuse of the battery is effectively improved, the contraction of the diaphragms is inhibited, the phenomenon of short circuit between the anode and the cathode of the battery is avoided, and the problem of poor high-temperature-resistant safety performance of the lithium ion battery in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 shows a schematic representation of a method according to the utility model a side view of an embodiment of a diaphragm;
FIG. 2 shows a side view of the separator shown in FIG. 1 with positive and negative electrode sheets placed;
fig. 3 shows a top view of the separator shown in fig. 1 when the positive and negative electrode sheets are placed.
Wherein the above figures include the following reference numerals:
10. a diaphragm; 11. a diaphragm body; 111. base group a membrane; 112. a functional coating; 12. edge coating;
20. a positive electrode sheet; 21. a positive electrode current collector; 22. a positive electrode active material coating layer;
30. a negative electrode plate; 31. a negative electrode current collector; 32. a negative electrode active material coating layer;
40. and a positive electrode tab.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 to 3, the present utility model provides a separator including: a diaphragm body 11, the diaphragm body 11 being rectangular, the diaphragm body 11 including a base film 111 and functional coatings 112 provided on one side or opposite sides of the base film 111; two binding coating combinations, which are respectively arranged at two opposite sides of the diaphragm main body 11, each binding coating combination comprises two binding coatings 12 respectively positioned at two long sides of the diaphragm main body 11; each of the over-coating layers 12 is coated on the base film 111, and the functional coating layer 112 is located between the two over-coating layers 12 of the corresponding over-coating layer combination; wherein the thickness H1 of each of the coating layers 12 is greater than the thickness H2 of the corresponding functional coating layer 112, and the separator body 11 and the two coating layer combinations together enclose two receiving spaces respectively located at opposite sides of the separator body 11 for receiving the positive electrode tab 20 and the negative electrode tab 30 respectively.
In this way, the diaphragm of the utility model carries out the edge-wrapping treatment on the diaphragm main body 11 to form the edge-wrapping coating 12 on the basis of not changing the structure of the diaphragm main body 11 of the diaphragm of the existing lithium ion battery, and can play a role in inhibiting the diaphragm 10 from shrinking between the adjacent positive electrode plate 20 and the negative electrode plate 30 when the battery is subjected to high temperature due to thicker edge-wrapping coating 12 while not affecting the conventional electrical performance of the battery; in addition, the edge coating 12 of two adjacent diaphragms 10 in the battery are mutually adhered, so that the effect of inhibiting the contraction of the diaphragms 10 is achieved, the phenomenon of the contraction of the diaphragms caused by heating in the process of heat abuse of the battery is effectively improved, the contraction of the diaphragms is inhibited, the phenomenon of short circuit between the anode and the cathode of the battery is avoided, and the problem of poor high-temperature-resistant safety performance of the lithium ion battery in the prior art is solved.
The separator body 11 and the over-coating 12 of the separator of the present utility model are coated with a polyvinylidene fluoride coating.
Specifically, the thickness of the polyvinylidene fluoride coating is 0.05 to 0.3 times the sum of the thickness of the over-coating 12 and the thickness of the polyvinylidene fluoride coating.
Preferably, the method comprises the steps of, the polyvinylidene fluoride coating has a thickness of 1 to 3 microns.
The polyvinylidene fluoride coating slurry for forming the polyvinylidene fluoride coating of the present utility model comprises polyvinylidene fluoride (PVDF), a binder, a dispersant, a surfactant, and a solvent.
Preferably, the width B1 of each of the hemming coatings 12 is 2 to 10 mm; and/or each functional coating 112 has a thickness H2 of 1 micron to 5 microns.
It is further preferred that the composition comprises, the width B1 of each of the over-coating layers 12 is 2mm to 5 mm.
Preferably, the positive electrode tab 20 is equidistant from the two edge coating layers 12 on opposite sides thereof, and the negative electrode tab 30 is equidistant from the two edge coating layers 12 on opposite sides thereof; the distance B2 between the edge coating 12 and the negative electrode tab 30 is 1 to 3 microns; and/or the distance B2 between the edge coating 12 and the negative electrode tab 30 is less than the distance B3 between the edge coating 12 and the positive electrode tab 20.
Further preferably, B2 is 2 microns.
Preferably, the positive electrode tab 20 includes a positive electrode current collector 21 and two positive electrode active material coatings 22 respectively disposed on opposite sides of the positive electrode current collector 21, the thickness of the coating 12 is H1, the thickness of the separator body 11 is H3, and the thickness of the positive electrode active material coating 22 is H4; wherein H4 is more than or equal to H1 is more than or equal to 2H3.
Further preferably, the thickness H1 of the separator body 11 is equal to the thickness H4 of the single-layer positive electrode active material coating layer 22.
Alternatively, the base film 111 includes at least one of a high molecular polyethylene film, a high molecular polyethylene film coated with ceramic on one side, a high molecular polyethylene film coated with ceramic on both sides, a high molecular polypropylene film, a composite film of high molecular polypropylene and high molecular polyethylene, a polyimide film, and a cellulose nonwoven fabric.
Optionally, the functional coating 112 comprises at least one of a ceramic material, polyimide, cellulosic nonwoven, aramid coating, and polyvinylidene fluoride.
Specifically, the functional coating 112 is a ceramic material or an organic material; wherein the ceramic material comprises at least one of alumina, boehmite, magnesia and calcium oxide; the organic material comprises at least one of Polyimide (PI), cellulose non-woven fabric, aramid coating and polyvinylidene fluoride (PVDF).
The hemming coating slurry for forming the hemming coating 12 of the present utility model includes ceramic powder, a binder, a dispersant, a thickener, a wetting agent, a surfactant, and a solvent.
Optionally, the ceramic powder comprises at least one of boehmite, alumina, magnesia, and calcia; the ceramic powder has a median particle diameter D50 of 0.2 to 1.5 microns.
Specifically, D50 refers to the particle size corresponding to a cumulative percentage of particle size distribution of 50%, and is physically defined as the particle size being less than 50% of its particles and the particle size being greater than 50% of its particles, also referred to as median or median particle size, commonly used to represent the average particle size of the powder particles.
Optionally, the binder comprises at least one of polyvinylidene fluoride, carboxymethyl cellulose, polyvinyl alcohol, and polyethylene carbonate.
Optionally, the dispersant comprises at least one of polyoxyethylene dioleate, polytetraethylene glycol monostearate, polyacrylamide, polyethylene glycol and polyvinylpyrrolidone.
Optionally, the thickener comprises at least one of a polyacrylate copolymer emulsion, a polymethacrylate emulsion, and a polyacrylic emulsion.
Alternatively, the process may be carried out in a single-stage, the solvent comprises at least one of water, ethanol, glycerol, dimethylformamide and dimethylacetamide.
As shown in fig. 2 and fig. 3, the present utility model further provides a battery, which includes a positive electrode plate 20, a negative electrode plate 30, an electrolyte and the above-mentioned separator, wherein a plurality of separators are disposed between the positive electrode plate 20 and the negative electrode plate 30, the positive electrode plate 20, the negative electrode plate 30 and the separator 10 are all plural, the plurality of positive electrode plates 20 and the plurality of negative electrode plates 30 are disposed in a crossing manner, the separator 10 is disposed between the adjacent positive electrode plate 20 and the negative electrode plate 30, and after the positive electrode plate 20, the negative electrode plate 30 and the separator 10 are stacked, a hot pressing process is required to ensure adhesion between the separator 10 and the positive electrode plate 20 and the negative electrode plate 30 and adhesion between the edge coating 12 of the plurality of separators 10 so as to seal two sides of the positive electrode plate 20 and the negative electrode plate 30.
Specifically, the positive electrode tab 20 is connected to the outside through a positive electrode tab 40, and the positive electrode tab 20 includes a positive electrode current collector 21 and two positive electrode active material coatings 22 respectively located at opposite sides of the positive electrode current collector 21; wherein the positive electrode active material in the positive electrode active material coating layer 22 includes a ternary Nickel Cobalt Manganese (NCM) material, the nickel content is medium nickel or high nickel.
Specifically, the negative electrode tab 30 includes a negative electrode current collector 31 and two negative electrode active material coatings 32 respectively located on opposite sides of the negative electrode current collector 31; the negative electrode active material in the negative electrode active material coating layer 32 includes a graphite material, which is at least one of artificial graphite, natural graphite, and a mixture of artificial graphite and natural graphite.
Wherein the thickness of the anode active material coating 22 is H5, H5 being greater than H4.
Specifically, the solvent in the electrolyte includes at least one of Ethylene Carbonate (EC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), fluoroethylene carbonate (FEC), and the like.
The preparation method of the separator 10 of the present utility model is as follows:
uniformly mixing ceramic powder, an organic solvent, a binder and a dispersing agent in a certain ratio to obtain a binding coating slurry, coating the binding coating slurry on opposite sides of the separator body 11 containing the functional coating 112 to form a binding coating 12, and drying the binding coating 12; then spraying polyvinylidene fluoride paint on the diaphragm main body 11 and the edge coating 12, to form a polyvinylidene fluoride a vinyl fluoride coating; the coating mode of the edge coating 12 can adopt gravure roll coating or narrow slit extrusion limit coating.
Specifically, the edge coating slurry is a high-solid-content aqueous ceramic slurry, and comprises a composition (50 to 70 percent) and a solvent (30 to 50 percent) in percentage by weight; wherein the composition comprises, in weight percent, 0.1 to 5 parts of an aqueous dispersant, 0.1 to 5 parts of a thickener, 0.1 to 5 parts of a wetting agent, 5 to 10 parts of a binder, 5 to 10 parts and 75 to 95 parts of ceramic particles.
The preparation method and test procedure of the battery having the separator 10 of the present utility model are as follows:
1. preparation method
1.1 preparation of Positive electrode sheet
Ternary material LiNi of positive electrode active material 0.8 Co 0.1 Mn 0.1 O 2 Conductive carbon black (SP) and binder polyvinylidene fluoride (PVDF) was prepared in 92%:3%: mixing 5% by weight of the components and dispersing the components in a methyl pyrrolidone (NMP) solvent, and uniformly stirring to obtain anode coating slurry; the positive electrode coating paste is coated on the surfaces of the opposite sides of the positive electrode current collector 21, and after drying, two layers of positive electrode active material coating layers 22 are obtained, and then the positive electrode sheet 20 is obtained through cold pressing and sheet punching.
1.2 preparation of negative electrode pieces
The negative electrode active material graphite, conductive carbon black (SP), thickener carboxymethyl cellulose (CMC) and binder Styrene Butadiene Rubber (SBR) were mixed in 97%:0.5%:1%:1.5% of the total weight of the anode active material is mixed and dispersed in deionized water solvent, the anode coating slurry is obtained after uniform stirring, the anode coating slurry is coated on the surfaces of two opposite sides of an anode current collector 31 (such as copper foil), two layers of anode active material coatings 32 are obtained after baking and drying, and then cold pressing and slicing are carried out to obtain an anode piece 30.
1.3 preparation of separator
The separator is commercially available on the market: such as at least one of a high molecular polyethylene film (PE film), a high molecular polyethylene film coated with ceramic on one side, a high molecular polyethylene film coated with ceramic on both sides, a high molecular polypropylene film (PP film), a composite film of high molecular polypropylene and high molecular polyethylene, a polyimide film and a cellulose nonwoven fabric.
Preparation of the edging coating slurry: adding aluminum oxide ceramic powder into deionized water, and adding defoamer propanol, dispersant ammonium polyacrylate, thickener polymethacrylate copolymer emulsion, binder carboxymethyl cellulose (CMC) and fluorocarbon surfactant, wherein the mass ratio of the components is 60%:28%:2%:1.5%:1.5%:5%:2% to form a high solids aqueous ceramic slurry.
Polyvinylidene fluoride preparation of coating slurry: adding polyvinylidene fluoride, polyacrylate binder, dispersant ammonium polyacrylate and fluorocarbon surfactant into deionized water, wherein the mass ratio of the polyvinylidene fluoride to the polyacrylate binder to the dispersant ammonium polyacrylate to the fluorocarbon surfactant is 35%:5%:0.5%:1.5%:58 to form a high viscosity aqueous polyvinylidene fluoride slurry.
The hemming coating paste is coated on both long sides of the diaphragm body 11, to form the over-coating 12 having a width of 2mm to 5mm, the thickness of each of the over-coating layers 12 is made to approach the thickness of the single-layer positive electrode active material coating layer 22 on the positive electrode tab 20.
The polyvinylidene fluoride coating paste is coated on the diaphragm body 11 and the over-coating layer 12 to form a rubberized layer having a thickness of 1um to 3um, and the diaphragm 10 is formed after drying.
1.4 preparation of batteries
The positive electrode tab 20 was baked at 110 ℃ for 12 hours, and the negative electrode tab 30 was baked at 85 ℃ for 12 hours.
The positive electrode sheet 20, the negative electrode sheet 30 and the separator 10 are laminated in a zigzag shape.
After lamination was completed, the laminate was hot-pressed at 90℃for 30 seconds under a pressure of 0.5MPa to form a cell electrode group.
And (3) placing the battery cell electrode group into a shell, injecting electrolyte, vacuum packaging, and standing for 24 hours.
Step pre-charging is carried out to 4.2V according to 0.05C, 0.1C and 0.33C, then charging and discharging are carried out for two circles according to 0.33C, and the voltage interval is 2.8-4.2V, so that the preparation of the lithium ion battery is completed.
2. Battery cell safety device Performance testing
And (3) heating test:
the lithium ion battery is charged to a cut-off voltage at a constant current of 0.33C, then, the charge was carried out at a constant voltage to an off-current of 0.05C, and the charge was stopped.
The lithium ion battery is pre-tightened by a steel clamp, the preload was 1.5Nm.
And (3) placing the lithium ion battery with the clamp in a hot box, heating at a heating rate of 2 ℃ per minute from room temperature until the highest temperature reaches 200 ℃, preserving heat for 30 minutes, and observing whether the battery has combustion explosion or not.
3. Test experiment
To further illustrate the impact of the separator of the present utility model on the safety performance of lithium ion batteries, different examples and comparative examples were set up and tested, as shown in table 1 below:
from the test results, the high temperature resistance of the battery can be obviously improved by arranging the edge coating, the high temperature resistant upper limit of the lithium ion battery is improved by 20-30 ℃, so that the risk of thermal runaway of the lithium ion battery caused by premature contraction of the diaphragm is obviously reduced.
As can be seen from examples 1 to 3 and comparative examples 1 to 3, the PE base film has a certain improvement in heat shrinkage resistance after being coated with the functional coating layer including the ceramic material, and the heat shrinkage resistance of the separator is further improved after being coated with the over-coating layer including the ceramic material;
as can be seen from examples 1 to 4 and comparative examples 1 to 4, the thickness of the ceramic coating greatly affects the heat shrinkage resistance of the separator without providing the over coating, the difference between the upper heat resistance limits is more than 10 c, and the difference is significantly reduced after providing the over coating, the difference between the upper heat resistance limits is less than 5 c.
It can be seen from examples 2, 3 and 5 that the width of the over-coating had less significant effect on the upper heat resistance limit of the battery heating, and that the upper heat resistance limit of the battery did not increase significantly after increasing the width of the over-coating.
As can be seen from examples 3 and 6 to 8, the thickness of the over-coating has a significant effect on the upper limit of heat resistance of the battery, since the closer the thickness of the over-coating is to the thickness of the positive electrode active material coating, the easier the formation of effective closed sides after hot pressing of the battery, i.e., the more stable adhesive effect is easily formed between thicker over-coating layers, enhancing the anti-shrinkage ability of the separator; in addition, when the thickness of the coating layer is increased, the coating layer is more difficult to retract between the positive electrode sheet and the negative electrode sheet, the method has a strong improvement effect on improving the high temperature resistance of the lithium ion battery and the thermal safety performance of the battery. Specifically, when the thickness of the coating layer is reduced to less than half of the thickness of the positive electrode active material coating layer, the high temperature resistant upper limit of the battery is obviously reduced, and the reduction amplitude reaches more than 10 ℃; and when the thickness of the coating layer is increased to more than half of the thickness of the positive electrode active material coating layer, the rise width of the high temperature resistant upper limit of the battery is relatively small.
From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:
the separator of the present utility model includes: a diaphragm body 11, the diaphragm body 11 being rectangular, the diaphragm body 11 including a base film 111 and functional coatings 112 provided on one side or opposite sides of the base film 111; two binding coating combinations, which are respectively arranged at two opposite sides of the diaphragm main body 11, each binding coating combination comprises two binding coatings 12 respectively positioned at two long sides of the diaphragm main body 11; each of the over-coating layers 12 is coated on the base film 111, the functional coating 112 is located between two of the binder coatings 12 of the respective binder coating combination; wherein the thickness H1 of each of the over-coating layers 12 is greater than the thickness H2 of the corresponding functional coating layer 112, the separator body 11 and the two hemming coating combinations together enclose two accommodation spaces respectively located at opposite sides of the separator body 11 for accommodating the positive electrode tab 20 and the negative electrode tab 30, respectively. In this way, the diaphragm of the utility model carries out the edge-wrapping treatment on the diaphragm main body 11 to form the edge-wrapping coating 12 on the basis of not changing the structure of the diaphragm main body 11 of the diaphragm of the existing lithium ion battery, and can play a role in inhibiting the diaphragm 10 from shrinking between the adjacent positive electrode plate 20 and the negative electrode plate 30 when the battery is subjected to high temperature due to thicker edge-wrapping coating 12 while not affecting the conventional electrical performance of the battery; in addition, the edge coating 12 of two adjacent diaphragms 10 in the battery are mutually adhered, so that the effect of inhibiting the contraction of the diaphragms 10 is achieved, the phenomenon of the contraction of the diaphragms caused by heating in the process of heat abuse of the battery is effectively improved, the contraction of the diaphragms is inhibited, the phenomenon of short circuit between the anode and the cathode of the battery is avoided, and the problem of poor high-temperature-resistant safety performance of the lithium ion battery in the prior art is solved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that to: like reference numerals and letters refer to like items throughout the following drawings, and, accordingly, once an item is defined in one drawing, no further discussion of it is necessary in subsequent drawings.
In the description of the present utility model, it should be understood that the azimuth or positional relationship indicated by azimuth words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationship shown in the drawings, for the purposes of simplicity and ease of description, the directional terms do not indicate or imply that the devices or elements being referred to must have, or be constructed or operated in, a particular orientation and thus should not be construed as limiting the scope of the utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations), and a corresponding explanation of the spatially relative descriptions used herein is made.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. A separator, comprising:
a diaphragm body (11), the diaphragm body (11) being rectangular, the diaphragm body (11) comprising a base film (111) and functional coatings (112) provided on one side or on opposite sides of the base film (111);
two binding coating combinations, which are respectively arranged at two opposite sides of the diaphragm main body (11), each binding coating combination comprises two binding coatings (12) respectively positioned at two long sides of the diaphragm main body (11); each of the edge coating layers (12) is coated on the base film (111), the functional coating (112) is located between two binding coatings (12) of the respective binding coating combination;
the thickness H1 of each edge coating (12) is larger than the thickness H2 of the corresponding functional coating (112), and the diaphragm main body (11) and the two edge coating combinations are jointly enclosed into two containing spaces respectively located on two opposite sides of the diaphragm main body (11) so as to be used for containing the positive electrode plate (20) and the negative electrode plate (30) respectively.
2. The membrane according to claim 1, characterized in that the membrane body (11) and the edging coating (12) are coated with a polyvinylidene fluoride coating.
3. A diaphragm according to claim 1,
the width B1 of each of the edge-covering coatings (12) is 2mm to 10 mm; and/or
The thickness H2 of each of the functional coatings (112) is 1 to 5 microns.
4. A diaphragm according to claim 1,
the distance B2 between the edge coating (12) and the negative electrode piece (30) is 1-3 microns; and/or
The distance B2 between the edge coating (12) and the negative electrode sheet (30) is smaller than the distance B3 between the edge coating (12) and the positive electrode sheet (20); and/or
The positive electrode piece (20) comprises a positive electrode current collector (21) and two layers of positive electrode active material coatings (22) which are respectively arranged on two opposite sides of the positive electrode current collector (21), wherein the thickness of the edge coating (12) is H1, the thickness of the diaphragm main body (11) is H3, and the thickness of the positive electrode active material coating (22) is H4; wherein H4 is more than or equal to H1 is more than or equal to 2H3.
5. A diaphragm according to claim 1,
the median particle diameter D50 of the ceramic powder of the binder coating slurry used to form the binder coating (12) is 0.2 to 1.5 microns.
6. A diaphragm according to claim 2,
the thickness of the polyvinylidene fluoride coating is 0.05 to 0.3 times the sum of the thickness of the edge coating (12) and the thickness of the polyvinylidene fluoride coating; and/or
The polyvinylidene fluoride coating has a thickness of 1 to 3 microns.
7. A battery comprising a positive electrode sheet (20), a negative electrode sheet (30), an electrolyte, and the separator according to any one of claims 1 to 6, the separator being provided between the positive electrode sheet (20) and the negative electrode sheet (30).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221359588.6U CN219811630U (en) | 2022-05-31 | 2022-05-31 | Diaphragm and method for manufacturing the same Battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221359588.6U CN219811630U (en) | 2022-05-31 | 2022-05-31 | Diaphragm and method for manufacturing the same Battery cell |
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| CN219811630U true CN219811630U (en) | 2023-10-10 |
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| CN202221359588.6U Active CN219811630U (en) | 2022-05-31 | 2022-05-31 | Diaphragm and method for manufacturing the same Battery cell |
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