CN113904039A - Anodic oxidation liquid, battery shell, and insulation protection method and application thereof - Google Patents
Anodic oxidation liquid, battery shell, and insulation protection method and application thereof Download PDFInfo
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- CN113904039A CN113904039A CN202111163688.1A CN202111163688A CN113904039A CN 113904039 A CN113904039 A CN 113904039A CN 202111163688 A CN202111163688 A CN 202111163688A CN 113904039 A CN113904039 A CN 113904039A
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/122—Composite material consisting of a mixture of organic and inorganic 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
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
- H01M50/145—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against corrosion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of batteries, in particular to an anodic oxidation liquid, a battery shell, an insulation protection method and application thereof. The battery shell comprises a shell body and a protective layer arranged on the surface of the shell body, wherein the protective layer is made of a composite material formed by aluminum oxide and polyaniline. The battery shell provided by the invention can greatly improve the insulating property and the corrosion resistance of the battery shell.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an anodic oxidation liquid, a battery shell, an insulation protection method and application thereof.
Background
The lithium ion battery has the advantages of high energy density, good safety performance, long cycle life, safety, environmental protection and the like, and is widely applied to electronic consumer products, energy storage, new energy automobiles and the like, wherein the lithium ion battery used for the new energy automobiles is called as a power battery. Generally, power batteries can be divided into cylindrical batteries, soft package batteries and square batteries according to the packaging form of the power batteries, and the square batteries have the highest market occupation ratio due to higher packaging reliability, stable structure, high energy efficiency and simple grouping.
The shell of battery generally makes aluminium, because it is the metal material, can use the insulating film cladding of polypropylene or polyester material usually on the shell surface, thereby can avoid metal casing and utmost point post to switch on and cause the short circuit and even whole battery thermal runaway on the one hand, and on the other hand can reduce the loss that external foreign matter scraped and causes the battery case to a certain extent, has maintained the pleasing to the eye of battery.
However, the battery shell needs to be clamped by a tool for coating, so that the steps are complicated, the time consumption is long, and the production efficiency is influenced; if the gas in the film can not be completely discharged during coating, bubbles can be generated on the film, so that the insulating films on the two sides of the battery are not easy to align when being folded, and the surface of the insulating film is wrinkled, thereby not only affecting the appearance of the battery, but also leading the thickness of the battery to exceed the specification, and increasing the difficulty in subsequent module packaging; and because the material of insulating protection film is mostly polypropylene (PP) or Polyester (PET), easily there is following problem: firstly, the material has insufficient strength and is easy to scratch, so that the battery cell shell is exposed, and the short circuit risk exists; secondly, the heat-conducting property of the insulating protective film is not good enough, and the heat volatilization of the battery cell can be influenced by the coating, so that the heat dissipation effect of the battery cell is reduced; and thirdly, the insulating protective film has certain flammability, and is easy to ignite to cause fire when the battery is out of control due to heat, thereby greatly threatening the overall safety of the battery. Although the prior art adopts a scheme of arranging an aluminum oxide protective film on the surface of a battery aluminum shell, the technology is only suitable for the sealing process of a cylindrical battery core and is used for replacing a sealing ring, and the insulating property and the corrosion resistance of the technology are limited.
Disclosure of Invention
The invention aims to overcome the defects of limited insulating property and corrosion resistance of a battery shell in the prior art, and further provides an anodic oxidation liquid, the battery shell, an insulating protection method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the battery shell comprises a shell body and a protective layer arranged on the surface of the shell body, wherein the protective layer is made of a composite material formed by aluminum oxide and polyaniline. It is understood that the protective layer may be on the inner surface or the outer surface of the housing body, and preferably, both the inner and outer surfaces of the housing body are provided with the protective layer.
Preferably, the thickness of the protective layer is 15-25 μm, such as 15 μm, 17 μm, 18 μm, 20 μm, 22 μm.
Preferably, the aluminum oxide accounts for 75-90% of the total mass of the protective layer material;
the shell body is made of metal aluminum.
The battery shell comprises a cylindrical battery shell and a square battery shell, and the battery shell is a lithium ion battery shell.
The invention also provides an anodic oxidation solution which comprises the following components in percentage by mass: 20-40 wt% of acid, 5-10 wt% of film forming control agent, 3-10 wt% of aniline and 40-70 wt% of solvent.
Preferably, the acid is selected from one or more of sulfuric acid, oxalic acid and chromic acid;
the film forming control agent is selected from glycerol and/or ammonium sulfate;
the solvent is water.
The battery case may be prepared by the following insulation protection method of the battery case.
The invention also provides application of the anodic oxidation liquid in insulation protection of a battery shell.
The invention also provides an insulation protection method of the battery shell, which comprises the following steps:
placing a battery shell to be treated in an anodic oxidation solution for electrolysis to form a protective layer on the surface of the battery shell, namely obtaining the battery shell after insulation protection;
the anodic oxidation liquid is the anodic oxidation liquid.
Preferably, the electrolysis step comprises placing the battery shell to be treated in the anode oxidizing solution, connecting the battery shell with the anode of the power supply, connecting the cathode of the power supply with the anode oxidizing solution, and forming a loop between the battery shell and the anode oxidizing solution for electrolysis.
Preferably, the method also comprises the steps of polishing, degreasing and drying the battery shell to be treated;
preferably, a water washing step is further included between the degreasing and drying steps.
Preferably, the degreasing step comprises the step of placing the polished battery shell in degreasing liquid for ultrasonic cleaning;
preferably, the degreasing fluid comprises the following components in parts by mass: 5-8 wt% of degreasing agent, 4-6 wt% of surfactant, 1-3 wt% of corrosion inhibitor, 1-3 wt% of brightener and 80-90 wt% of solvent;
preferably, the oil removing agent is sodium carbonate and/or sodium silicate; the surfactant is fatty glyceride and/or sodium stearate; the corrosion inhibitor is sodium tripolyphosphate; the brightener is sodium benzoate; the solvent is water; preferably, the fatty acid glyceride is glyceryl monostearate.
Preferably, the electrolytic current is 1.5-2A/dm2The electrolysis time is 30-60 min;
the ultrasonic frequency is 30000-40000Hz, and the ultrasonic time is 50-80 min;
the drying temperature is 50-70 deg.C, and the drying time is 30-50 min.
Preferably, the first and second liquid crystal materials are,
the battery shell to be processed comprises a cylindrical battery shell and a square battery shell, and the battery shell to be processed is an aluminum shell;
after the electrolysis is finished, the step of sealing holes of the electrolyzed battery shell is also included;
preferably, the hole sealing step comprises the step of placing the electrolyzed battery shell in water for standing, preferably, the temperature of the water is 80-100 ℃, the pH value of the water is 6-8, and the standing time is 20-30 min.
Preferably, the step of sealing the holes further includes a step of detecting insulation of the battery case after the hole sealing treatment, specifically, the step of detecting insulation capacity of the battery case after the hole sealing treatment detects magnitude of leakage current under application of different voltages, and determines whether the requirement of using the battery case is met.
The invention also provides a lithium ion battery, which is provided with the battery shell or the battery shell obtained by the insulation protection method.
The invention has the beneficial effects that:
1. the battery shell comprises a shell body and a protective layer arranged on the surface of the shell body, wherein the protective layer is made of a composite material formed by aluminum oxide and polyaniline. According to the invention, the composite material protection layer formed by the aluminum oxide and the polyaniline is arranged on the surface of the shell body, so that the insulation performance and the corrosion resistance of the battery shell can be greatly improved.
2. The anode oxidation liquid provided by the invention adopts specific anode oxidation liquid components, and when the anode oxidation liquid is applied to a battery shell insulation protection method, the anode oxidation can be carried out on the battery shell, and the electric polymerization treatment can be carried out on an aniline monomer, so that a compact aluminum oxide/polyaniline composite material protection layer is formed on the inner surface and the outer surface of the shell, and the insulation performance and the corrosion resistance of the battery shell can be greatly improved.
3. According to the insulation protection method for the battery shell, the battery shell is subjected to anodic oxidation by using current by adopting an electrolysis method, and the aniline monomer is subjected to electropolymerization treatment (aniline can generate free radicals under anodic oxidation under electrification, free radical coupling initiates polymerization, the polymerization is an autocatalysis reaction, an initiator is not required to be added), a compact aluminum oxide/polyaniline composite material protection layer is formed on the inner surface and the outer surface of the shell, the protection layer is tightly combined with an aluminum shell body due to in-situ generation and is not easy to fall off, compared with a traditional PET (polyethylene terephthalate) film, the in-situ generated aluminum oxide/polyaniline composite protection layer is more tightly combined with the shell, and poor appearances such as bubbles, folds and the like cannot occur; the composite hardness is high, the scratch resistance and the insulativity are high, and the short circuit risk of the battery cell is reduced; the alumina film is not combustible, so that the risk of thermal runaway of the battery cell is reduced; the introduction of an external insulating film is avoided, the height and the width of the battery are reduced, and the battery has more advantages in capacity exertion.
Meanwhile, the battery shell obtained by the insulation protection method provided by the invention enhances the insulation and corrosion resistance of the battery shell, and simultaneously reduces the whole width and thickness of the battery core, so that the volume energy density of the battery core is improved. In addition, the process cancels the procedure of external coating in the production process of the battery cell, integrates the insulation protection procedure into the production and manufacture of the shell, greatly improves the production efficiency of the battery cell, reduces the reject ratio, and simultaneously improves the space utilization rate of a production line. Meanwhile, the battery shell provided by the invention also has an insulating protective layer on the inner surface, so that the risk of short circuit inside the battery is reduced, and meanwhile, the corrosion of electrolyte on the battery shell can be effectively relieved by the internal protective layer. The insulation protection method provided by the invention is simultaneously suitable for square and cylindrical aluminum shells, is simple to operate, and does not need additional model changing operation for the switching of the treatment of shells of different models.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides an insulation protection method for an aluminum shell of a square battery, which comprises the following steps:
1) mechanical polishing: mechanically polishing the inner surface and the outer surface of the square battery aluminum shell formed by stamping by using polishing powder to remove scratches and reduce the surface roughness of the aluminum shell;
2) degreasing treatment: putting the polished aluminum shell into an ultrasonic cleaning machine filled with degreasing fluid for ultrasonic cleaning to remove oil contamination in the mechanical polishing process, wherein the ultrasonic frequency is 40000Hz, and the ultrasonic time is 60 min;
the degreasing fluid consists of the following components in percentage by mass: 4 wt% of sodium carbonate, 4 wt% of sodium silicate, 5 wt% of glyceryl monostearate, 1 wt% of sodium tripolyphosphate, 1 wt% of sodium benzoate and 85 wt% of water;
3) anodic oxidation: washing the degreased aluminum shell with clear water to remove degreasing liquid, and then placing the aluminum shell in an oven for drying at the drying temperature of 50 ℃ for 40 min; after drying, putting the aluminum shell into the anodic oxidation liquid for electrolysis, wherein the whole aluminum shell is connected with the anode of a power supply, the cathode of the power supply is connected with the anodic oxidation liquid, a loop is formed between the anode and the cathode of the power supply, and the electrolysis current is 1.5A/dm2The electrolysis time is 40min, a protective layer is formed on the inner surface and the outer surface of the aluminum shell after the electrolysis is finished, the protective layer is made of a composite material formed by aluminum oxide and polyaniline, and the aluminum oxide accounts for 80% of the total mass of the protective layer material; the thickness of the protective layer is 17 μm;
the anodic oxidation solution comprises the following components in percentage by mass: 15 wt% of sulfuric acid, 10 wt% of oxalic acid, 5 wt% of glycerol, 5 wt% of aniline and 65 wt% of water;
4) hole sealing treatment: and (3) placing the electrolyzed aluminum shell into deionized water, standing for 30min to seal the holes on the surface of the porous protective layer, wherein the temperature of the deionized water is 100 ℃, the pH value is 6, taking out the electrolyzed aluminum shell after standing, and airing to obtain the square battery aluminum shell after insulation protection.
Example 2
The embodiment provides an insulation protection method for an aluminum shell of a cylindrical battery, which comprises the following steps:
1) mechanical polishing: mechanically polishing the inner surface and the outer surface of the cylindrical battery aluminum shell formed by stamping by using polishing powder to remove scratches and reduce the surface roughness of the aluminum shell;
2) degreasing treatment: putting the polished aluminum shell into an ultrasonic cleaning machine filled with degreasing fluid for ultrasonic cleaning to remove oil contamination in the mechanical polishing process, wherein the ultrasonic frequency is 40000Hz, and the ultrasonic time is 50 min;
the degreasing fluid consists of the following components in percentage by mass: 5 wt% of sodium carbonate, 3 wt% of sodium silicate, 2 wt% of glyceryl monostearate, 3 wt% of sodium stearate, 1 wt% of sodium tripolyphosphate, 1 wt% of sodium benzoate and 85 wt% of water;
3) anodic oxidation: degreasing the aluminumWashing the shell with clear water to remove degreasing fluid, and drying in an oven at 60 deg.C for 50 min; after drying, putting the aluminum shell into the anodic oxidation liquid for electrolysis, wherein the whole aluminum shell is connected with the anode of a power supply, the cathode of the power supply is connected with the anodic oxidation liquid, a loop is formed between the anode of the power supply and the anodic oxidation liquid, and the electrolysis current is 2A/dm2The electrolysis time is 50min, a protective layer is formed on the inner surface and the outer surface of the aluminum shell after the electrolysis is finished, the protective layer is made of a composite material formed by aluminum oxide and polyaniline, and the aluminum oxide accounts for 85% of the total mass of the protective layer material; the thickness of the protective layer is 20 μm;
the anodic oxidation solution comprises the following components in percentage by mass: 20 wt% of sulfuric acid, 15 wt% of oxalic acid, 3 wt% of glycerol, 3 wt% of ammonium sulfate, 6 wt% of aniline and 53 wt% of water;
4) hole sealing treatment: and (3) placing the electrolyzed aluminum shell into deionized water, standing for 30min to seal the holes on the surface of the porous protective layer, wherein the temperature of the deionized water is 100 ℃, the pH value is 6, taking out the electrolyzed aluminum shell after standing, and airing to obtain the square battery aluminum shell after insulation protection.
Example 3
The embodiment provides an insulation protection method for an aluminum shell of a cylindrical battery, which comprises the following steps:
1) mechanical polishing: mechanically polishing the inner surface and the outer surface of the cylindrical battery aluminum shell formed by stamping by using polishing powder to remove scratches and reduce the surface roughness of the aluminum shell;
2) degreasing treatment: putting the polished aluminum shell into an ultrasonic cleaning machine filled with degreasing fluid for ultrasonic cleaning to remove oil contamination in the mechanical polishing process, wherein the ultrasonic frequency is 30000Hz, and the ultrasonic time is 80 min;
the degreasing fluid consists of the following components in percentage by mass: 5 wt% of sodium silicate, 4 wt% of sodium stearate, 3 wt% of sodium tripolyphosphate, 3 wt% of sodium benzoate and 85 wt% of water;
3) anodic oxidation: washing the degreased aluminum shell with clear water to remove degreasing liquid, and then placing the aluminum shell in an oven for drying at 70 ℃ for 30 min; after the drying is finishedPutting an aluminum shell into the anodic oxidation solution for electrolysis, wherein the whole aluminum shell is connected with a power supply anode, a power supply cathode is connected with the anodic oxidation solution, a loop is formed between the power supply cathode and the anodic oxidation solution, and the electrolysis current is 2A/dm2The electrolysis time is 30min, a protective layer is formed on the inner surface and the outer surface of the aluminum shell after the electrolysis is finished, the protective layer is made of a composite material formed by aluminum oxide and polyaniline, and the aluminum oxide accounts for 75% of the total mass of the protective layer material; the thickness of the protective layer is 15 μm;
the anodic oxidation solution comprises the following components in percentage by mass: 40 wt% of sulfuric acid, 5 wt% of glycerol, 3 wt% of aniline and 52 wt% of water;
4) hole sealing treatment: and (3) placing the electrolyzed aluminum shell into deionized water, standing for 20min to seal the holes on the surface of the porous protective layer, wherein the temperature of the deionized water is 80 ℃, the pH value is 8, taking out the electrolyzed aluminum shell after standing, and airing to obtain the square battery aluminum shell after insulation protection.
Comparative example 1 (without aniline monomer)
The comparative example provides an insulation protection method for an aluminum case of a square battery, comprising the following steps:
1) mechanical polishing: mechanically polishing the inner surface and the outer surface of the square battery aluminum shell formed by stamping by using polishing powder to remove scratches and reduce the surface roughness of the aluminum shell;
2) degreasing treatment: putting the polished aluminum shell into an ultrasonic cleaning machine filled with degreasing fluid for ultrasonic cleaning to remove oil contamination in the mechanical polishing process, wherein the ultrasonic frequency is 40000Hz, and the ultrasonic time is 60 min;
the degreasing fluid consists of the following components in percentage by mass: 4 wt% of sodium carbonate, 4 wt% of sodium silicate, 5 wt% of glyceryl monostearate, 1 wt% of sodium tripolyphosphate, 1 wt% of sodium benzoate and 85 wt% of water;
3) anodic oxidation: washing the degreased aluminum shell with clear water to remove degreasing liquid, and then placing the aluminum shell in an oven for drying at the drying temperature of 50 ℃ for 40 min; after drying, putting the aluminum shell into the anodic oxidation liquid for electrolysis, wherein the whole aluminum shell is connected with the anode of the power supply, and the cathode of the power supply is connected with the anodic oxidation liquidA loop is formed between the two, and the electrolytic current is 1.5A/dm2The electrolysis time is 40min, and a protective layer is formed on the inner surface and the outer surface of the aluminum shell after the electrolysis is finished, wherein the protective layer is made of aluminum oxide; the thickness of the protective layer is 17 μm;
the anodic oxidation solution comprises the following components in percentage by mass: 15 wt% of sulfuric acid, 10 wt% of oxalic acid, 5 wt% of glycerol and 70 wt% of water;
4) hole sealing treatment: and (3) placing the electrolyzed aluminum shell into deionized water, standing for 30min to seal the holes on the surface of the porous protective layer, wherein the temperature of the deionized water is 100 ℃, the pH value is 6, taking out the electrolyzed aluminum shell after standing, and airing to obtain the square battery aluminum shell after insulation protection.
Test example 1
Resistance detection is performed on the aluminum shells of the batteries after insulation protection, which are obtained in the above examples and comparative examples, by using a multimeter, the detection positions of the aluminum shells of the examples and comparative examples are the same, and the detection results are shown in table 1.
TABLE 1 aluminum case resistance
| Resistance (omega) | |
| Example 1 | 1.23*105 |
| Example 2 | 1.98*105 |
| Example 3 | 9.7*104 |
| Comparative example 1 | 2.03*104 |
The results in table 1 show that compared with a single alumina film, the alumina/polyaniline composite material of the present invention has a higher protective layer resistance and better insulation performance.
Test example 2
The insulation-protected aluminum cases of the batteries obtained in the above examples and comparative examples were subjected to a neutral salt spray test in which a 5% by mass aqueous solution of sodium chloride salt (solution pH 6.5) was used as the spraying solution, the test temperature was 35 ℃, the humidity was 96%, and the salt spray sedimentation rate was 2ml/(h × cm)2) Therefore, the corrosion resistance of the aluminum shell is detected, and the test result shows that: only after 168h did a slight corrosion product appear on the surface of the aluminum shell in example 1; only after 180h did slight corrosion products appear on the surface of the aluminum shell in example 2; only after 140h did a slight corrosion product appear on the surface of the aluminum shell in example 3; and after 96 hours, pitting corrosion appears on the surface of the aluminum shell of the comparative example 1, which shows that the protective layer of the aluminum oxide and polyaniline composite material has more excellent corrosion resistance.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The battery shell is characterized by comprising a shell body and a protective layer arranged on the surface of the shell body, wherein the protective layer is made of a composite material formed by aluminum oxide and polyaniline.
2. The battery case according to claim 1, wherein the protective layer has a thickness of 15-25 μm.
3. The battery case according to claim 1 or 2, wherein the aluminum oxide accounts for 75-90% of the total mass of the protective layer material;
the shell body is made of metal aluminum.
4. The anodic oxidation solution is characterized by comprising the following components in percentage by mass: 20-40 wt% of acid, 5-10 wt% of film forming control agent, 3-10 wt% of aniline and 40-70 wt% of solvent.
5. The anodizing solution of claim 4, wherein the acid is selected from one or more of sulfuric acid, oxalic acid and chromic acid;
the film forming control agent is selected from glycerol and/or ammonium sulfate;
the solvent is water.
6. Use of the anodizing solution of claim 4 or 5 for insulation protection of a battery can.
7. An insulation protection method for a battery case is characterized by comprising the following steps:
placing a battery shell to be treated in an anodic oxidation solution for electrolysis to form a protective layer on the surface of the battery shell, namely obtaining the battery shell after insulation protection;
the anodic oxidation liquid is the anodic oxidation liquid according to claim 4 or 5.
8. The insulation protection method of a battery shell according to claim 7, further comprising the steps of polishing, degreasing and drying the battery shell to be processed;
preferably, the degreasing step comprises the step of placing the polished battery shell in degreasing liquid for ultrasonic cleaning;
preferably, the degreasing fluid comprises the following components in parts by mass: 5-8 wt% of degreasing agent, 4-6 wt% of surfactant, 1-3 wt% of corrosion inhibitor, 1-3 wt% of brightener and 80-90 wt% of solvent;
preferably, the oil removing agent is sodium carbonate and/or sodium silicate; the surfactant is fatty glyceride and/or sodium stearate; the corrosion inhibitor is sodium tripolyphosphate; the brightener is sodium benzoate; the solvent is water;
preferably, the electrolytic current is 1.5-2A/dm2The electrolysis time is 30-60 min;
the ultrasonic frequency is 30000-40000Hz, and the ultrasonic time is 50-80 min;
the drying temperature is 50-70 deg.C, and the drying time is 30-50 min.
9. The insulation protection method of a battery case according to claim 7 or 8,
the battery shell to be processed comprises a cylindrical battery shell and a square battery shell, and the battery shell to be processed is an aluminum shell;
after the electrolysis is finished, the step of sealing holes of the electrolyzed battery shell is also included;
preferably, the hole sealing step comprises the step of placing the electrolyzed battery shell in water for standing, preferably, the temperature of the water is 80-100 ℃, the pH value of the water is 6-8, and the standing time is 20-30 min.
10. A lithium ion battery having a battery case according to any one of claims 1 to 3 or a battery case obtained by the insulation protection method according to any one of claims 7 to 9.
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| CN106149028A (en) * | 2016-07-14 | 2016-11-23 | 安徽恒兴装饰工程有限公司 | A kind of aluminium alloy extrusions coloring front surface processing technology |
| CN107338463A (en) * | 2017-07-11 | 2017-11-10 | 深圳仕上电子科技有限公司 | The Hard anode oxidation method of panel class Product processing part of appliance |
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