CN114824612A - Battery with composite insulating layer inside and preparation method thereof - Google Patents
Battery with composite insulating layer inside and preparation method thereof Download PDFInfo
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- CN114824612A CN114824612A CN202210424904.1A CN202210424904A CN114824612A CN 114824612 A CN114824612 A CN 114824612A CN 202210424904 A CN202210424904 A CN 202210424904A CN 114824612 A CN114824612 A CN 114824612A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/231—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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Abstract
The invention discloses a battery with a composite insulating layer inside and a preparation method thereof, belonging to the technical field of lithium ion batteries.A static spraying method is adopted to carry out anisotropic spraying on the inner wall of a battery shell to form an insulating layer formed by insulating powder coating; the outer anti-corrosion coating is coated by PTFE emulsion or PFA emulsion. The invention effectively improves the reliability of the battery cell by spraying the insulating coating with compressibility and the coating capable of preventing electrolyte corrosion on the large surface inside the battery cell, and the compressibility coating can effectively absorb the expansion of the battery cell in the circulation process and prolong the circulation life of the battery cell; through the insulating coating of the inside bottom spraying high coefficient of heat conductivity of electric core, increase the heat-sinking capability of electric core, save the inside bottom plate of electric core, promote the ability that electrolyte soaks electric core.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a battery with a composite insulating layer inside and a preparation method thereof.
Background
The design that battery case usually adopts electrified to prevent that lithium ion from imbedding battery aluminum hull from producing electrochemical corrosion, and then cause electrolyte to leak and arouse insulating failure, because most battery case are all electrified, in order to guarantee battery safety, need carry out insulation protection to the inside naked electric core of battery case, take place electrochemical corrosion in order to prevent battery case. The existing battery core internal insulation method is characterized in that materials such as a PET (polyethylene terephthalate) film and a PP (polypropylene) film are adopted to coat a battery shell, the coating process inside a naked battery core is difficult to control along with the increase of the size of the battery core, hot melting is required to be carried out with a battery top cover after coating is finished, hot melting wire drawing is possibly generated in the hot melting process, light leakage is generated when a battery top cover plate is welded with the shell in a laser mode, and potential safety hazards such as short circuit are possibly generated due to damage of the internal structure of the battery core caused by the laser light leakage. And the material intensity of internal insulation films such as PET membrane, PP membrane is relatively poor, is impaled by ultrasonic welding sediment and laser welding sediment that produce in the electric core production process easily, because naked electric core adopts the anodal form of negative pole outsourcing usually, and the battery casing area is put in order the electricity, and the welding sediment is extremely easily produced safety risks such as interior short circuit after impaling the internal insulation film. And different types of coatings are sprayed on the large surface and the bottom surface inside the battery cell, so that the reliability of the battery cell is improved, and the cycle life of the battery cell is prolonged.
The prior art discloses a preparation method of a composite insulating layer on the surface of an aluminum alloy battery shell, which comprises the following steps: (1) cleaning the surface of the aluminum alloy battery shell by using a cleaning agent to remove oil stains and finish the pretreatment of the surface of the aluminum alloy battery shell; (2) preparing a micro-arc oxidation ceramic layer on the surface of the aluminum alloy battery shell obtained after the pretreatment in the step (1); (3) and (3) mixing polymethylphenyl organic silicon resin with absolute ethyl alcohol to obtain organic silicon resin spraying liquid, spraying and curing the micro-arc oxidation ceramic layer obtained in the step (2) by using the organic silicon resin spraying liquid, and preparing the composite insulating layer on the aluminum alloy battery shell. However, the micro-arc oxidation ceramic layer can only be used on the outer layer of the battery shell, cannot resist electrolyte corrosion and is applied to the interior of the battery core.
The prior art discloses a spraying method of an insulating layer and application thereof in a battery shell, wherein before the battery is assembled, the insulating layer is formed on the outer surface of the battery shell by adopting an electrostatic powder spraying method, the obtained insulating layer has good adhesive force with the battery shell and can endure a long-term high-temperature and high-humidity environment, the problems that the adhesion between the insulating layer and the battery shell is unreliable and the like in the prior art are solved, and the problem that the solidification of the insulating layer is limited by the enduring temperature range of electrolyte, a diaphragm and the like in the battery is solved; the preparation method has the characteristics of strong operability and suitability for automatic production. However, in the method, the surface of the insulating layer still needs to be wrapped with an insulating protective layer in a hot-melting mode, and the insulating protective layer is made of PET, PP or PC and cannot be applied to the inside of the battery.
The prior art also discloses a method for carrying out surface treatment and modification on graphene and inorganic insulating heat-conducting filler by adopting a coupling agent, and weakening the interlayer acting force of the nano-particle heat-conducting filler and disaggregating the aggregation state of the nano-particle heat-conducting filler by various dispersion methods such as high-pressure homogenization and/or supercritical and the like; the heat-conducting fillers with different sizes and different forms are compounded for use, so that the addition amount of the heat-conducting fillers can be reduced, a heat-conducting network can be better constructed, the heat conductivity of the material is improved, and the heat of the battery is rapidly dispersed and led out of the interior of the battery; the PP composite material which has excellent mechanical properties, particularly impact resistance, high fluidity, high heat conductivity, insulation, flame retardance and the like and can meet the requirements of a lithium battery shell can be obtained through reasonable combination proportion and an adaptive preparation method, but the shell material has poor overall strength, thicker composite material coating and poor heat conductivity.
To sum up, for avoiding naked electric core and battery case, lamina tecti in assembling process, because the safety risk that ultrasonic bonding welding slag, laser welding scheduling problem caused, need carry out insulation treatment to naked electric core. Though traditional materials such as PET, PI, PP internal insulation film have certain insulating properties, the pad pasting technology operation of this kind of insulating film is complicated, and needs to carry out the hot melt with the battery top cap after accomplishing the diolame, and the hot melt in-process probably produces the hot melt wire drawing, produces the light leak when leading to battery lamina tecti and casing laser welding, and the laser light leak probably leads to electric core inner structure damage and then produces potential safety hazards such as short circuit.
Disclosure of Invention
In order to solve the problem of insulation protection in the lithium ion battery in the prior art, the lithium ion battery is further prevented from being embedded into the battery aluminum shell to generate electrochemical corrosion, and further the electrolyte is leaked to cause insulation failure; the invention provides a battery with a composite insulating layer inside and a preparation method thereof, wherein most battery shells are electrified, so that the inside of a lithium ion battery needs to be insulated and protected in order to ensure the safety of the battery, so that the battery shells are prevented from being subjected to electrochemical corrosion; the invention effectively improves the reliability of the battery cell by spraying the insulating coating with compressibility and the coating preventing the corrosion of the electrolyte on the large surface inside the battery cell, and the compressibility coating can effectively absorb the expansion of the battery cell in the circulation process, thereby improving the circulation life of the battery cell; through the insulating coating of the inside bottom spraying high coefficient of heat conductivity of electric core, increase the heat-sinking capability of electric core, save the inside bottom plate of electric core, promote the ability that electrolyte soaks electric core.
The invention is realized by the following technical scheme:
a battery with a composite insulating layer inside comprises a pole piece, a diaphragm, an electrolyte solution and a battery shell, wherein the insulating layer formed by anisotropic spraying of an insulating powder coating is sprayed on the inner wall of the battery shell by adopting an electrostatic spraying method, the insulating layers on the large surface and the side surface of the battery on the inner wall of the battery shell are both of a double-layer structure, and the double-layer structure comprises an inner insulating powder coating layer and an outer anti-corrosion coating layer which are low in heat conductivity coefficient and compressible; the insulating layer on the bottom surface of the battery on the inner wall of the battery shell is of a double-layer structure, and the double-layer structure comprises an inner-layer insulating powder coating with high heat conductivity coefficient and an outer-layer anti-corrosion coating; the main insulating material of the inner insulating powder coating is a resin material, and the outer anti-corrosion coating is coated by PTFE emulsion or PFA emulsion.
Further, the inner-layer insulating powder coating comprises an insulating material, a heat conducting material and a leveling material.
Further, the insulating material is one of phenolic resin, polyester resin, polyamide resin and polyvinyl chloride resin or a combination of at least two of the phenolic resin, the polyester resin, the polyamide resin and the polyvinyl chloride resin; the leveling material is at least one of phenol, formaldehyde and polyacrylic acid.
Further, for the insulation layers on the large side and the side of the battery on the inner wall of the battery shell, the coating composition of the inner layer insulation powder coating is as follows:
the mass of the inner layer insulation powder coating is 100%, the mass percentage of the insulation material is 60-80%, and the mass percentage of the leveling material is 20-40%; the insulation material comprises 25-35% of polyester resin and 35-40% of phenolic resin in percentage by mass, the thickness of the insulation layer is 130um-180um, and the thickness of the inner layer insulation powder coating is 80um-100 um.
Further, for the insulation layer of the battery bottom surface of the inner wall of the battery shell, the used inner layer insulation powder coating comprises the following components:
the mass percentage of the inner layer insulation powder coating is 100%, the mass percentage of the insulation material is 60-70%, the mass percentage of the heat conduction material is 25-30%, and the mass percentage of the leveling material is 5-15%, wherein the mass percentage of the polyester resin and the mass percentage of the phenolic resin in the insulation material are 25-30% and 30-40% respectively; the thickness of insulating layer is 130um-180um, and the thickness of inlayer insulating powder coating is 90um-120 um.
Further, the outer layer anticorrosive paint is a treated PFA emulsion, and the PFA emulsion is a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene.
On the other hand, the invention also provides a preparation method of the battery with the composite insulating layer inside, which comprises the following steps:
the method comprises the following steps: cleaning the battery shell by adopting laser or alkaline solution, and putting the cleaned battery shell into an oven for preheating treatment;
step two: preparing an inner layer insulating powder coating and an outer layer anticorrosive coating;
step three: horizontally placing the preheated battery shell on a glass plate, and spraying inner-layer insulating powder coating on the inner wall of the battery shell and the bottom surface of the battery;
step four: preheating the battery shell which is sprayed with the inner layer insulating powder coating, flatly placing the preheated battery shell on a glass plate, uniformly spraying the outer layer anticorrosive coating on the inner layer insulating powder coating by using a spray gun, and after the coating is cured at room temperature, finishing spraying of the outer layer anticorrosive coating;
step five: and (3) laminating/winding the positive plate, the negative plate and the diaphragm, and directly putting the laminated/wound bare cell into a battery shell with an internal insulation powder coating.
Further, the preheating conditions in the first step and the fourth step are as follows: the temperature is 90-110 ℃, and the time is 15-25 min.
Further, the spraying method in the third step is electrostatic powder spraying.
Further, the outer layer anticorrosive coating is PFA emulsion in the fourth step, wherein PFA emulsion coated on the large surface and the side surface of the inner wall of the battery shell is not subjected to material pretreatment, and the heat insulation performance of the PFA emulsion is utilized to be matched with the inner insulating coating to play a role in blocking heat conduction between cells; the PFA emulsion coated on the bottom surface of the battery shell is coated with nano titanium dioxide to improve the heat-conducting property of the PFA emulsion, and the thickness of the PFA emulsion coating is 50-80 um.
Compared with the prior art, the invention has the following advantages:
the invention adopts an electrostatic spraying method to carry out anisotropic spraying on the inner wall of the battery shell, and the layers, the components, the thickness, the heat conductivity coefficient and the elasticity of the coatings on the large surface, the side surface and the bottom surface of the inner wall of the shell are different. Through anisotropic insulating electrostatic spraying, the inner wall of the shell of the battery cell can be effectively insulated, and the naked battery cell does not need to be coated with external insulating films made of materials such as PET (polyethylene terephthalate), PP (polypropylene) and the like, so that the production process of the battery cell is simplified; meanwhile, the influence of the hot melting and wire drawing of the internal insulation film on the laser sealing and welding effect of the battery cell is avoided, and the safety of the battery cell is improved; the expansion force generated by material aging in the battery core circulation process is effectively absorbed by spraying the insulating coating with compressibility on the large surface of the inner wall; the heat dissipation capacity of the battery cell is improved by spraying the insulating coating with high heat conductivity coefficient on the bottom of the battery cell; the innermost layer is coated with PTFE emulsion or PFA emulsion, and the insulating inner wall is subjected to anticorrosive treatment, so that the reliability of the inner insulating coating is effectively improved; and the insulating coating with high heat conductivity coefficient is sprayed on the bottom inside the battery cell, so that the heat dissipation capacity of the battery cell is improved, the bottom supporting plate inside the battery cell is omitted, and the capacity of soaking the battery cell by the electrolyte is improved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of an insulating layer formed by anisotropic spraying of an insulating powder coating on the inner wall of a battery case according to the present invention;
in the figure: the battery comprises a battery shell inner wall 1, an inner layer insulating powder coating 2 and an outer layer anti-corrosion coating 3;
fig. 2 is a schematic flow chart of a method for manufacturing a battery having a composite insulating layer therein according to the present invention.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The battery with the composite insulating layer inside comprises a pole piece, a diaphragm, an electrolyte solution and a battery shell, wherein the insulating layer formed by anisotropic spraying of an insulating powder coating is formed on the inner wall of the battery shell by adopting an electrostatic spraying method; the insulating layer formed by the insulating powder coating has good insulating property and heat dissipation performance, the use of an insulating film and a bottom supporting plate in a battery can be omitted, the hot melting procedure of the inner insulating film and plastic under the top cover plate can be omitted, and the risk of laser welding light leakage caused by hot melting wire drawing is eliminated; the coating material has compressibility and can be compressed in the battery cell circulation process, so that the battery cell expansion caused by the anode and cathode materials and the gas generated by side reaction can be effectively absorbed; when the insulating powder coating is used for forming an insulating layer on the inner wall of a battery shell, the adhesive force between the obtained insulating layer and the inner surface of the battery shell is good, and the corrosion risk of an electrolyte to the battery shell and an inner insulating coating is eliminated by coating PTFE or PFA emulsion on the innermost layer.
Specifically, the insulation layers on the large battery surface and the side surface of the inner wall of the battery shell are of a double-layer structure, and the double-layer structure comprises an inner-layer insulation powder coating layer and an outer-layer anti-corrosion coating layer, wherein the inner-layer insulation powder coating layer is low in thermal conductivity coefficient and compressible; the insulating layer on the bottom surface of the battery on the inner wall of the battery shell is of a double-layer structure, and the double-layer structure comprises an inner-layer insulating powder coating and an outer-layer anti-corrosion coating with high heat conductivity coefficient; the inner layer insulating powder coating has compressibility and can absorb the expansive force generated by the expansion of the large surface of the battery due to the expansion of the anode and cathode materials, the gas generation of side reaction and the like in the battery circulation process. The outer layer anti-corrosion coating is coated by PTFE emulsion or PFA emulsion, so that the corrosion of electrolyte on the inner wall of the battery shell and the insulating coating can be effectively prevented.
The main insulating material of the inner-layer insulating powder coating is a resin material, the large-side and side-face coatings of the shell comprise insulating materials and leveling materials, and the bottom coating of the shell is provided with the insulating materials, heat conducting materials and the leveling materials; the insulating material is one or the combination of at least two of phenolic resin, polyester resin, polyamide resin and polyvinyl chloride resin; the heat conducting material comprises at least one of boron nitride, aluminum nitride, silicon carbide, silicon nitride, aluminum oxide, gallium nitride, gallium arsenide, gallium phosphide, zinc oxide, indium phosphide, beryllium oxide, magnesium oxide and silicon magnesium nitride. Preferably, the heat conduction material is at least one of boron carbide, silicon carbide or silicon nitride as a heat conduction agent, and the heat conduction agent has excellent heat conduction performance and good insulation performance. The leveling material includes phenol, formaldehyde, and polyacrylic acid.
The PFA emulsion coated on the bottom surface of the battery shell is coated with nano titanium dioxide to improve the heat conducting property of the battery shell, the thickness of the PFA emulsion coating is 50-80 microns, the PFA emulsion coating can effectively reduce the thermal resistance between a bare cell and the battery shell, and the heat conducting property of the battery is improved; the leveling material is at least one of phenol, formaldehyde and polyacrylic acid.
For the insulation layers on the large side and the side surface of the battery on the inner wall of the battery shell, the used inner layer insulation powder coating comprises the following components:
the content of the insulating material is 60-80% by mass based on 100% by mass of the inner layer insulating powder coating, for example, 60%, 70% and 80% by mass, but not limited to the recited values, and other values not recited in the numerical range are also applicable; preferably 60 to 75%; the mass percentage of the leveling material is 20-40%; the insulation material comprises, by mass, 25-35% of polyester resin and 35-45% of phenolic resin, the thickness of an insulation layer is 130um-180um, and the thickness of an inner insulation powder coating is 80um-100 um.
For the insulating layer on the bottom surface of the battery on the inner wall of the battery shell, the coating composition of the inner layer insulating powder coating is as follows:
the mass percentage of the insulating material is 55-70% by mass of the inner layer insulating powder coating based on 100%, for example, 60% and 70%, but not limited to the recited values, and other values not recited in the numerical range are also applicable; preferably 60 to 70%; the mass percentage of the heat conduction material is 25-35%, and the mass percentage of the leveling material is 5-15%, wherein the mass percentage of the polyester resin and the mass percentage of the phenolic resin in the insulating material are 25-35% and 35-40% respectively; the thickness of insulating layer is 130um-180um, and the thickness of inlayer insulating powder coating is 90um-120 um.
The outer layer anticorrosive paint is a treated PFA emulsion, the PFA emulsion is a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, wherein the PFA emulsion coated on the large surface and the side surface of the inner wall of the battery shell is not subjected to material pretreatment, and the heat insulation performance of the PFA emulsion is utilized to be matched with the inner insulation coating to play a role in blocking heat conduction between cells; the PFA emulsion coated on the bottom surface of the battery shell is coated with nano titanium dioxide to improve the heat-conducting property of the battery shell, and the thickness of the PFA emulsion coating is 50-80 um.
Example 1
The battery with the composite insulating layer inside comprises a pole piece, a diaphragm, an electrolyte solution and a battery shell, wherein the insulating layer formed by anisotropically spraying an insulating powder coating on the inner wall of the battery shell by adopting an electrostatic spraying method has good insulating property and heat dissipation performance, the use of an insulating film and a bottom supporting plate in the battery can be omitted, and the hot melting process of the insulating film and plastic under a top cover plate can be omitted; the insulating layers on the large battery surface and the side surface of the inner wall of the battery shell are both of a double-layer structure, and the double-layer structure comprises an inner-layer insulating powder coating with low heat conductivity coefficient and compressibility and an outer-layer anti-corrosion coating; the coating material has compressibility, can be compressed in the battery core circulation process, carries out anticorrosive treatment on the insulating inner wall, effectively promotes the reliability of the inner insulating coating, and eliminates the corrosion risk of electrolyte to the battery shell and the inner insulating coating. (ii) a The insulating layer on the bottom surface of the battery on the inner wall of the battery shell is of a double-layer structure, and the double-layer structure comprises an inner-layer insulating powder coating with high heat conductivity coefficient and an outer-layer anti-corrosion coating; the main insulating material of the inner insulating powder coating is a resin material, and the outer anti-corrosion coating is coated by PTFE emulsion or PFA emulsion. The insulating coating with high heat conductivity coefficient is sprayed on the bottom inside the battery cell, so that the heat dissipation capacity of the battery cell is improved, the insulating bottom supporting plate inside the battery cell is omitted, and the capacity of soaking the battery cell by electrolyte is improved.
The thickness of the inner layer insulation powder coating is 100um, and the main insulation material of the inner layer insulation powder coating is a resin material and comprises an insulation material, a heat conduction material and a leveling material; the insulating material is polyester resin, phenolic resin and epoxy resin; the mass percentage of the inner layer insulation powder coating is 100%, and the mass percentage of the insulation material is 80%, wherein the mass percentage of the polyester resin, the phenolic resin and the epoxy resin in the insulation material is respectively 30%, 30% and 20%; the heat conduction material is boron carbide and silicon carbide, and the heat conduction agent has excellent heat conduction performance and good insulating performance; the leveling material comprises phenol, formaldehyde and polyacrylic acid; the mass percentage of the leveling material is 20%.
The outer layer insulation corrosion-resistant coating main body is PFA emulsion, and the thickness is 60 um.
The insulating coating used for the bottom surface of the battery comprises the following components: the mass of the inner layer insulation powder coating is 100%, and the mass percentage of the insulation material is 70%; the mass percentages of the polyester resin and the phenolic resin in the insulating material are respectively 40% and 30%, the mass percentage of the heat conducting material is 30%, and the mass percentage of the leveling material is 10%; the thickness of the bottom insulating material is 100 um.
The invention adopts anisotropic spraying insulating material, and effectively improves the reliability of the battery cell by spraying the insulating coating with compressibility and the electrolyte corrosion prevention coating on the large surface inside the battery cell, and the compressibility coating can effectively absorb the expansion of the battery cell generated in the circulation process, thereby prolonging the circulation life of the battery cell.
The results of the performance tests of example 1 and cells without an internal insulating coating are shown in table 1;
table 1 shows the performance test of the battery cells of example 1 without using the internal insulation coating
As can be seen from table 1, the battery performance of the battery cells using the internal insulation coating of this example 1 is improved.
Example 2
As shown in fig. 2, a flow chart of a method for manufacturing a battery having a composite insulating layer inside includes the following steps:
the method comprises the following steps: cleaning the battery shell by adopting laser or alkaline solution, and putting the cleaned battery shell into an oven for preheating treatment; the conditions of the preheating treatment are as follows: the temperature is 90-110 ℃, and the time is 15-25 min;
step two: preparing an inner layer insulating powder coating and an outer layer anticorrosive coating;
step three: horizontally placing the preheated battery shell on a glass plate, and spraying inner-layer insulating powder coating on the inner wall of the battery shell and the bottom surface of the battery; the spraying method is electrostatic powder spraying;
step four: preheating the battery shell which is sprayed with the inner layer insulating powder coating, flatly placing the preheated battery shell on a glass plate, uniformly spraying the outer layer anticorrosive coating on the inner layer insulating powder coating by using a spray gun, and after the coating is cured at room temperature, finishing spraying of the outer layer anticorrosive coating; the conditions of the preheating treatment are as follows: the temperature is 90-110 ℃, and the time is 15-25 min;
the outer layer anticorrosive coating is PFA emulsion, wherein PFA emulsion coated on the large surface and the side surface of the inner wall of the battery shell is not subjected to material pretreatment, and the heat insulation performance of the PFA emulsion is utilized to be matched with the inner insulation coating to play a role in blocking heat conduction between cells; the PFA emulsion coated on the bottom surface of the battery shell is coated with nano titanium dioxide to improve the heat-conducting property of the PFA emulsion, and the thickness of the PFA emulsion coating is 50-80 um;
step five: and (3) laminating/winding the positive plate, the negative plate and the diaphragm, and directly putting the laminated/wound bare cell into a battery shell with an internal insulation powder coating.
Through the inside anisotropic insulating material of spraying of electric core, guarantee naked electric core and casing top completely insulating, naked electric core need not the cladding internal insulation film, simplify electric core production processes, promote production efficiency, by casing surface foreign matter fish tail when avoiding the internal insulation film to go into the shell, and then influence electric core inside insulation, the hot melt process of plastic under internal insulation film and the lamina tecti has been saved, avoid producing impurity because of the internal insulation film hot melt, influence electric core laser seal welding and lead to the laser light leak, and then burn electric core, effectively promote electric core security.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A battery with a composite insulating layer inside is characterized by comprising a pole piece, a diaphragm, an electrolyte solution and a battery shell, wherein the insulating layer formed by anisotropic spraying of an insulating powder coating is sprayed on the inner wall of the battery shell by adopting an electrostatic spraying method; the insulating layer on the bottom surface of the battery on the inner wall of the battery shell is of a double-layer structure, and the double-layer structure comprises an inner-layer insulating powder coating with high heat conductivity coefficient and an outer-layer anti-corrosion coating; the main insulating material of the inner insulating powder coating is a resin material, and the outer anti-corrosion coating is coated by PTFE emulsion or PFA emulsion.
2. The battery of claim 1, wherein the inner insulating powder coating layer comprises an insulating material, a heat conducting material and a leveling material.
3. The battery having a composite insulating layer inside according to claim 2, wherein the insulating material is one of or a combination of at least two of phenolic resin, polyester resin, polyamide resin, and polyvinyl chloride resin; the heat conducting material is at least one of boron nitride, aluminum nitride, silicon carbide, silicon nitride, aluminum oxide, gallium nitride, gallium arsenide, gallium phosphide, zinc oxide, indium phosphide, beryllium oxide, magnesium oxide and silicon magnesium nitride; the leveling material is at least one of phenol, formaldehyde and polyacrylic acid.
4. The battery according to claim 3, wherein the inner layer insulating powder coating used for the insulating layers of the battery large face and side face of the inner wall of the battery case has the following composition:
the mass of the inner layer insulation powder coating is 100%, the mass percentage of the insulation material is 60-80%, and the mass percentage of the leveling material is 20-40%; the insulation material comprises 25-35% of polyester resin and 35-40% of phenolic resin in percentage by mass, the thickness of the insulation layer is 130um-180um, and the thickness of the inner layer insulation powder coating is 80um-100 um.
5. The battery according to claim 4, wherein the inner layer insulating powder coating composition for the insulating layer of the battery bottom surface of the inner wall of the battery case is as follows:
the mass percentage of the inner layer insulation powder coating is 100%, the mass percentage of the insulation material is 60-70%, the mass percentage of the heat conduction material is 25-30%, and the mass percentage of the leveling material is 5-15%, wherein the mass percentage of the polyester resin and the mass percentage of the phenolic resin in the insulation material are 25-30% and 30-40% respectively; the thickness of insulating layer is 130um-180um, and the thickness of inlayer insulating powder coating is 90um-120 um.
6. The battery of claim 5 having composite insulating layers inside, wherein the outer layer anticorrosive coating is a treated PFA emulsion, and the PFA emulsion is a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene.
7. The method for preparing the battery with the composite insulating layer inside according to claim 1, which is characterized by comprising the following steps:
the method comprises the following steps: cleaning the battery shell by adopting laser or alkaline solution, and putting the cleaned battery shell into an oven for preheating treatment;
step two: preparing an inner layer insulating powder coating and an outer layer anticorrosive coating;
step three: horizontally placing the preheated battery shell on a glass plate, and spraying inner-layer insulating powder coating on the inner wall of the battery shell and the bottom surface of the battery;
step four: preheating the battery shell which is sprayed with the inner layer insulating powder coating, flatly placing the preheated battery shell on a glass plate, uniformly spraying the outer layer anticorrosive coating on the inner layer insulating powder coating by using a spray gun, and after the coating is cured at room temperature, finishing spraying of the outer layer anticorrosive coating;
step five: and (3) laminating/winding the positive plate, the negative plate and the diaphragm, and directly putting the laminated/wound bare cell into a battery shell with an internal insulation powder coating.
8. The method of claim 7, wherein the preheating treatment in the first and fourth steps is performed under the following conditions: the temperature is 90-110 ℃, and the time is 15-25 min.
9. The method for preparing a battery having a composite insulating layer inside according to claim 7, wherein the spraying method in the third step is electrostatic powder spraying.
10. The method for preparing a battery with a composite insulating layer inside according to claim 7, wherein the outer layer anticorrosive paint in step four is PFA emulsion, wherein PFA emulsion coated on the large surface and the side surface of the inner wall of the battery shell is not subjected to material pretreatment, and the heat-insulating property of PFA emulsion is utilized to cooperate with the inner insulating coating to play a role in blocking heat conduction between cells; the PFA emulsion coated on the bottom surface of the battery shell is coated with nano titanium dioxide to improve the heat-conducting property of the PFA emulsion, and the thickness of the PFA emulsion coating is 50-80 um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210424904.1A CN114824612A (en) | 2022-04-21 | 2022-04-21 | Battery with composite insulating layer inside and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210424904.1A CN114824612A (en) | 2022-04-21 | 2022-04-21 | Battery with composite insulating layer inside and preparation method thereof |
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| CN114824612A true CN114824612A (en) | 2022-07-29 |
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| CN209880743U (en) * | 2019-04-11 | 2019-12-31 | 郑州深澜动力科技有限公司 | Battery cell, power battery pack and vehicle |
| CN112898871A (en) * | 2021-01-26 | 2021-06-04 | 湖北亿纬动力有限公司 | Insulating powder coating and application thereof |
| CN214254538U (en) * | 2021-02-26 | 2021-09-21 | 蜂巢能源科技有限公司 | Battery module and vehicle with same |
| CN114256540A (en) * | 2021-11-12 | 2022-03-29 | 江苏天合储能有限公司 | Battery shell protection layer, preparation method thereof and battery shell |
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2022
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04349342A (en) * | 1991-05-27 | 1992-12-03 | Matsushita Electric Ind Co Ltd | Sealed-type battery |
| CN204303875U (en) * | 2014-11-19 | 2015-04-29 | 东莞新能源科技有限公司 | A kind of safeguard construction of lithium ion battery metal shell |
| CN107326422A (en) * | 2017-07-03 | 2017-11-07 | 西安强微电气设备有限公司 | A kind of preparation method of aluminum alloy battery surface of shell composite insulation layer |
| CN209880743U (en) * | 2019-04-11 | 2019-12-31 | 郑州深澜动力科技有限公司 | Battery cell, power battery pack and vehicle |
| CN112898871A (en) * | 2021-01-26 | 2021-06-04 | 湖北亿纬动力有限公司 | Insulating powder coating and application thereof |
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| CN114256540A (en) * | 2021-11-12 | 2022-03-29 | 江苏天合储能有限公司 | Battery shell protection layer, preparation method thereof and battery shell |
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