Water-based friction modifier, stretching liquid for aluminum battery shell and preparation method and application of stretching liquid

Abstract

The invention provides a water-based friction modifier, a stretching liquid for an aluminum battery shell and a preparation method and application of the water-based friction modifier and the stretching liquid for the aluminum battery shell, the water-based friction modifier comprises C21 cyclic diacid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate, and the water-based friction modifier is prepared by compounding the three substances, the water-based friction modifier has excellent water solubility and easy cleaning performance, the stretching liquid for the aluminum battery shell containing the water-based friction modifier still has excellent lubricity after being diluted by 5-10 times, an excellent lubricating protective film can be formed on the metal surface, the water-based friction modifier further has the advantages of being low in oil consumption and easy to clean, the cleaning process can be effectively shortened, and the service life of the stretching liquid is prolonged. Waste liquid discharge of the cleaning agent is greatly reduced, and the method has important research significance.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and specifically relates to a water-based friction modifier, a stretching liquid for aluminum battery shells, and a preparation method and application thereof. Background Art

[0002] In the field of new energy, the aluminum shell of power batteries is an important container and a carrier of power batteries for new energy vehicles. It is generally installed on the lower part of the vehicle body and is mainly used to protect lithium batteries from damage when they are hit or squeezed by the outside world. As the carrier of the battery module, the battery pack shell plays a key role in the safe operation and protection of the battery module. Its good heat dissipation and conductivity, light weight, and the passivation film and corrosion resistance film formed in the natural environment are the highlights of the aluminum shell. At present, the application of aluminum alloy in power battery shells has been very extensive. Aluminum power battery shells are not only beautiful and exquisite, but also hard enough, heat-resistant and corrosion-resistant, making them the preferred material for automobile manufacturers.

[0003] At present, the material of automotive power battery aluminum shell products is usually 3003 aluminum sheet and strip, the main alloy element of which is manganese. This alloy is easy to process and form, corrosion-resistant, high-temperature resistant, has good heat transfer properties, good stamping and stretching effects, and the density of aluminum alloy is relatively low, which meets the development trend of lightweight automobiles.

[0004] Existing battery aluminum shells generally undergo 6 to 7 stamping and stretching processes to be finally formed. During the stamping and stretching process, a layer of stretching lubricant must be evenly applied to the mold surface to improve lubricity, reduce the pressure of the stamping equipment, save energy consumption, improve the stamping and stretching effect of the battery aluminum shell, and avoid generating a large amount of aluminum chips during stretching.

[0005] At present, most of the stretching media used for stamping aluminum battery shells on the market are high-viscosity pure oil-type lubricants. Although they can meet the production process requirements, they have many defects: (1) The oil has high viscosity, and after the oil film is formed, it is easy to cause abnormally high surface carryover of the mold and the workpiece, which greatly increases the oil consumption; (2) The high-viscosity oil-based stretching oil adheres to the surface of the battery shell in large quantities, making subsequent cleaning extremely difficult. Usually four cleanings and four rinses are required to meet the cleanliness requirements. In addition, the concentration of the detergent needs to be greatly increased during the cleaning process, and the detergent liquid needs to be frequently replaced, which leads to a sharp increase in waste liquid treatment costs and energy consumption; (3) The lubricity is not enough, and there will be some fine streak-like scratches on the surface of the workpiece; (4) During the high-speed stamping and stretching process, some light components are easy to evaporate, and there is a lot of oil mist, which is not good for the health of workers.

[0006] Based on the above content, water-based aluminum battery shell stretching fluid with environmental protection and easy-to-clean characteristics has gradually attracted widespread attention. For example, CN117660093A discloses a water-based aluminum alloy stretching fluid and its preparation method, wherein the water-based aluminum alloy stretching fluid, calculated by mass percentage, includes: 10-20% organic base; 5-15% rust inhibitor; 5-10% oiliness agent; 10-25% extreme pressure agent; 0.2-2% corrosion inhibitor; 0.3-1.8% bactericide; 0.05-0.2% defoamer; balance deionized water; it uses a water-based fully synthetic formula to optimize cooling performance to improve the smoothness and surface finish of the processed parts, and uses the characteristics of extreme pressure agent and oiliness agent to improve the overall lubrication properties. The water-based aluminum alloy stretching fluid has high lubrication performance and easy cleaning characteristics, which can better meet the processing requirements of aluminum alloys.

[0007] However, the water-based stretching fluid provided in the prior art including the above invention usually has the problem of low adhesion on the workpiece surface and the abrasive tool surface and poor lubricity after dilution.

[0008] Therefore, in view of the above-mentioned prior art problems, it is urgently necessary to develop a water-based friction modifier with excellent water solubility and easy cleaning, so as to obtain a stretching fluid for aluminum battery shells with good lubricity, low fuel consumption and easy cleaning. Summary of the invention

[0009] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a water-based friction modifier, a stretching fluid for aluminum battery shells, and a preparation method and application thereof. The water-based friction modifier has excellent water solubility and easy cleaning properties, and can make the stretching fluid for aluminum battery shells containing it still have excellent lubricity after being diluted 5 to 10 times, and can form an excellent lubricating protective film on the metal surface. It also has the advantages of low oil consumption and easy cleaning, can effectively shorten the cleaning process, and greatly reduce the waste liquid discharge of the cleaning agent, which is of great research significance.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a water-based friction modifier, comprising C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate.

[0012] The water-based friction modifier provided by the invention comprises C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate, and the three substances have a synergistic effect.

[0013] First, the C21 cyclic dibasic acid block polyether ester is a mixed ester with a special structure formed by polymerization reaction of a C21 dibasic acid with a six-membered ring structure and an EO-PO-EO block polyether. The substance contains a variety of polar functional groups with strong adsorption capacity, such as monoester, diester, carboxylic acid, ethylene oxide and propylene oxide, which can form strong adsorption on the friction surface. At the same time, the oleophilic end of the substance is a C21 long carbon chain structure, which can form a directional, uniform and dense arrangement inside the oil film, providing excellent lubrication and wear reduction performance.

[0014] Secondly, the ethylenediamine polyoxyethylene polyoxypropylene ether is produced by polymerization of ethylenediamine, ethylene oxide and propylene oxide. The substance has a spatial network structure, and its molecular structure contains two tertiary amino groups. The multi-branched functional groups connected thereto can be cross-linked to form a spatial three-dimensional coating structure, thereby significantly improving the oil film thickness and lubricity. At the same time, the substance itself has excellent low-foam cleaning performance;

[0015] Finally, the C12-14 alcohol polyoxyethylene ether phosphate is a phosphate ester obtained by reacting C12-C14 fatty alcohol polyoxyethylene ether with phosphoric acid. The substance has extremely strong extreme pressure lubricity and can form a layer of phosphate extreme pressure lubrication film during high-speed stamping and stretching with large deformation to prevent scratches on aluminum shell workpieces, and also protect the surface of aluminum alloy from corrosion and discoloration.

[0016] In summary, the present invention selects the above three substances for synergistic combination, so that the obtained water-based friction modifier has excellent water solubility, can effectively adhere to the surface of the workpiece and the mold, and form a strong water-soluble lubricating film, so that the appearance of the aluminum battery shell stretching liquid containing it is transparent, uniform and stable, and after a dilution ratio of 5 to 10 and low oil consumption, it can still form a sufficient lubricating film, and has excellent lubricity, so as to ensure that the workpiece has no scratch defects during the production process, and basically no oil mist is generated. In addition, it is very easy to clean and meets the requirements of the normal temperature cleaning trend. It can be cleaned with conventional low pH cleaning agents, which effectively shortens the cleaning process and greatly reduces the discharge of cleaning agent waste liquid.

[0017] Preferably, the mass ratio of the C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate is (1-5):(2-7):(1.5-4.5), for example, 1:2:1.5, 2:3:2, 3:4:2.5, 4:5:3, 4.5:6:3.5 or 5:7:4.5, etc.; if the mass ratio of the above three substances is not within the above range, it is easy to cause the adsorption performance of the obtained water-based friction modifier on the friction pair surface to be reduced, and it is impossible to form a sufficient lubricating film, which may lead to defects such as scratches on the workpiece and aluminum powder sticking to the mold.

[0018] Preferably, the C21 cyclic dibasic acid block polyether ester has a structure as shown in the following formula I:

[0019]

[0020] Preferably, the C21 cyclic dibasic acid block polyether ester having the structure shown in Formula I is prepared by polymerization of a C21 dibasic acid with a six-membered ring and an EO-PO-EO block polyether in the presence of a catalyst; wherein the structural formula of the C21 dibasic acid with a six-membered ring is The structural formula of the EO-PO-EO block polyether is: The catalyst includes p-toluenesulfonic acid.

[0021] Preferably, the ethylenediamine polyoxyethylene polyoxypropylene ether is obtained by polymerization of ethylenediamine, ethylene oxide and propylene oxide.

[0022] Preferably, the C12-14 alcohol polyoxyethylene ether phosphate is obtained by reacting C12-C14 fatty alcohol polyoxyethylene ether and phosphoric acid.

[0023] In a second aspect, the present invention provides a stretching fluid for an aluminum battery shell, wherein the stretching fluid for an aluminum battery shell comprises a base oil, a vegetable oil, a fatty amine, a fatty acid, a surfactant, a water-based friction modifier as described in the first aspect, and water.

[0024] The stretching fluid for aluminum battery shell provided by the present invention includes base oil, vegetable oil, fatty amine, fatty acid, surfactant, the water-based friction modifier as described in the first aspect and water. By matching the above-mentioned components, especially selecting the water-based friction modifier as described in the first aspect, a stable water-based system can be formed, so that the stretching fluid for aluminum battery shell still has excellent lubricity after being diluted 5 to 10 times, can form an excellent lubricating protective film on the metal surface, eliminate scratch defects on the workpiece surface, and greatly reduce oil consumption, and can completely replace traditional oil-based products; at the same time, it has excellent easy-to-clean performance, can greatly shorten the cleaning process, and reduce the cleaning temperature, the amount of cleaning agent, energy consumption and waste liquid discharge.

[0025] Preferably, based on a total amount of 100%, the amounts of the various components contained in the aluminum battery shell stretching liquid are as follows:

[0026]

[0027] Wherein, the usage amount of the base oil can be 15%, 17%, 19%, 21%, 23% or 25% etc.

[0028] The amount of the vegetable oil can be 5%, 7%, 9%, 11%, 13% or 15%, etc.

[0029] The amount of the fatty amine can be 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19% or 20%, etc.

[0030] The amount of the fatty acid can be 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19% or 20%, etc.

[0031] The amount of the surfactant can be 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14% or 15%, etc.

[0032] The dosage of the water-based friction modifier can be 10%, 12%, 14%, 16%, 18% or 20%, etc.; if the dosage of the water-based friction modifier is too high, it will not only lead to a significant increase in cost, but also increase the viscosity of the product and reduce the cooling performance of the processing process, thereby affecting the life of the mold. If the dosage of the water-based friction modifier is too low, it will easily lead to poor film-forming performance of the product and fail to meet the lubrication requirements under high-speed and high-deformation conditions.

[0033] Preferably, the base oil comprises Group III base oil.

[0034] Preferably, the vegetable oil comprises rapeseed oil and / or oxidized soybean oil.

[0035] Preferably, the fatty amine includes any one of triethanolamine, isopropanolamine or diethylene glycolamine, or a combination of at least two thereof.

[0036] Preferably, the fatty acid comprises any one of polymerized ricinoleic acid, oleic acid, isononanoic acid or C21 dibasic acid or a combination of at least two thereof.

[0037] Preferably, the surfactant comprises C16-C18 fatty alcohol polyoxyethylene ether and / or Span 80.

[0038] Preferably, the water is deionized water.

[0039] Preferably, the stretching liquid for the aluminum battery shell further includes any one of a coupling agent, an inhibitor or a rust inhibitor, or a combination of at least two thereof.

[0040] Preferably, the coupling agent comprises a C14-15 alcohol.

[0041] Preferably, the inhibitor comprises benzotriazole.

[0042] Preferably, the rust inhibitor comprises sodium petroleum sulfonate

[0043] In a second aspect, the present invention provides a method for preparing a stretching fluid for an aluminum battery shell as described in the first aspect, the preparation method comprising: uniformly mixing a base oil, a vegetable oil, a fatty amine, a fatty acid, a surfactant, a water-based friction modifier as described in the first aspect, water, an optional coupling agent, an optional inhibitor, and an optional rust inhibitor to obtain the stretching fluid for an aluminum battery shell.

[0044] It should be noted that when using the water-based friction modifier provided in the first aspect of the present invention to prepare the stretching fluid for aluminum battery shell, the C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate can be evenly mixed first, and then mixed with other components in the stretching fluid for aluminum battery shell; or the C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether, C12-14 alcohol polyoxyethylene ether phosphate and other components in the stretching fluid for aluminum battery shell can be directly mixed together.

[0045] In a fourth aspect, the present invention provides an application of the water-based friction modifier as described in the first aspect or the stretching liquid for aluminum battery shell as described in the second aspect in the preparation of battery aluminum shell.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) The water-based friction modifier provided by the present invention has excellent water solubility and can form a strong water-soluble lubricating film after dilution, and can then effectively adhere to the surface of the workpiece and the abrasive tool;

[0048] (2) The aluminum battery shell stretching liquid provided by the present invention still has excellent lubricity after being diluted 5 to 10 times, and can form an excellent lubricating protective film on the metal surface to eliminate scratch defects on the workpiece surface;

[0049] (3) The oil consumption of the aluminum battery shell stretching liquid provided by the present invention is greatly reduced, and it can completely replace traditional oil-based products;

[0050] (4) The stretching liquid for aluminum battery shell provided by the present invention has excellent easy-to-clean performance, which can greatly shorten the cleaning process flow, reduce the cleaning temperature, cleaning agent dosage, energy consumption and waste liquid discharge. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0052] Some of the raw material information involved in the following specific implementation is as follows:

[0053] (1) Class III base oil: purchased from SK Group of South Korea, brand name YUBASE 6;

[0054] (2) Rapeseed oil: purchased from Guangzhou Hexing Technology Co., Ltd., the brand is refined first-grade rapeseed oil;

[0055] (3) Oxidized soybean oil: purchased from Shandong Hairui New Materials Co., Ltd.;

[0056] (4) Polymeric ricinoleic acid: purchased from Shanghai Yingguang Industrial Co., Ltd., brand name HOSTAGLISS L4;

[0057] (5) C21 dibasic acid: purchased from MeadWestvaca, brand name DIACID1550;

[0058] (6) C16-C18 fatty alcohol polyoxyethylene ether: purchased from Shanghai Bangao Chemical Co., Ltd., brand name Peregal O-9;

[0059] (7) Arlacel 80: purchased from TCI (Shanghai) Chemical Industry Development Co., Ltd., brand name Arlacel 80;

[0060] (8) Ethylenediamine polyoxyethylene polyoxypropylene ether: number average molecular weight 2000, purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd., brand EDEP;

[0061] (9) C12-14 alcohol polyoxyethylene ether phosphate: purchased from Hai'an Petrochemical Plant, Jiangsu Province, brand name AEO-9P;

[0062] (10) C14-15 alcohol: purchased from Shell Petrochemicals, brand name NEODOL45;

[0063] (11) Sodium petroleum sulfonate: purchased from Shandong Longhui Chemical Co., Ltd.

[0064] Preparation Example 1

[0065] A C21 cyclic dibasic acid block polyether ester, the preparation method of which comprises:

[0066] The mixture is placed in a reactor, and p-toluenesulfonic acid accounting for 0.5% of the mass percentage of the two is added as a catalyst. Nitrogen is introduced into the reactor at a flow rate of 140 L / h. The cooling water is turned on and vacuum is drawn. The absolute pressure is adjusted to 0.8 bar. The temperature is then increased to 150°C at a heating rate of 30°C / h, and the reaction is carried out for 1 hour. The temperature is then increased to 230°C at a heating rate of 40°C / h. After 10 minutes, the vacuum degree is reduced to 0.05 bar. The reaction is continued at 230°C and 0.05 bar for 5 hours. Samples are taken for inspection. If the sample is unqualified, the reaction time is extended until the test is qualified. The reaction is stopped, cooling is started, and nitrogen is stopped to obtain the C21 cyclic dibasic acid block polyether ester.

[0067] Examples 1 to 8 and Comparative Examples 1 to 4

[0068] Examples 1 to 8 and Comparative Examples 1 to 4 respectively provide a stretching liquid for an aluminum battery shell, and the amounts of the components included are shown in Table 1, based on the total weight being 100%.

[0069] Table 1

[0070]

[0071]

[0072] Examples The preparation method of the stretching liquid for aluminum battery shell provided in Examples 1 to 8 and Comparative Examples 1 to 4 includes: mixing base oil, vegetable oil, fatty amine, fatty acid, surfactant, water-based friction modifier, water, coupling agent, inhibitor and rust inhibitor uniformly to obtain the stretching liquid for aluminum battery shell.

[0073] Comparative Example 5

[0074] A traditional water-based stretching fluid, specifically EF-1013 from Kunshan Dopu Lubrication Technology Co., Ltd.

[0075] Comparative Example 6

[0076] A conventional oil-based stretching fluid, specifically DC-DD56 from Los Petroleum (Zhejiang) Co., Ltd.

[0077] Performance Testing:

[0078] (1) Fuel consumption (amount carried away): The specific test steps are as follows: ① Clean the R36 steel plate with petroleum ether and anhydrous ethanol solvents, and weigh the net weight of the steel plate; ② Prepare 20% concentration of aluminum battery shell stretching liquid (i.e., dilute the aluminum battery shell stretching liquid by 5 times); ③ Immerse the R36 steel plate horizontally in the diluted aluminum battery shell stretching liquid, and then hang it at room temperature for 24 hours, then carefully remove the bottom droplets, and then weigh the total weight of the aluminum battery shell stretching liquid and the steel plate; ④ Calculate the fuel consumption based on the weight of the residual aluminum battery shell stretching liquid on the surface of the steel plate and the surface area of ​​the steel plate; ⑤ Fuel consumption = residual weight of aluminum battery shell stretching liquid / surface area of ​​the steel plate. The larger the residual weight, the higher the fuel consumption.

[0079] (2) Lubricity: The test was conducted using an Rtec multifunctional friction and wear tester. The friction coefficient under the same conditions was compared. The smaller the friction coefficient, the better the lubricity. The test pressure was 100N, the substrate was A3003 H14 aluminum alloy, the reciprocating frequency was 10Hz, and the dilution concentration was 20%.

[0080] (3) Cleaning performance: The same cleaning agent is used to clean steel plates coated with different samples at the same concentration, the same room temperature conditions, and the same ultrasonic cleaning time. Then the percentage of tensile liquid removed from the surface of the steel plate is weighed and calculated for evaluation. The larger the percentage, the stronger the cleaning ability. Among them, the cleaning object is R36 standard steel plate uniformly coated with different tensile liquids. The cleaning agent concentration is 3% (prepared with tap water), the cleaning temperature is 25±2℃, the cleaning time is 2mins / plate, and a total of three plates are washed.

[0081] The aluminum battery shells provided in Examples 1 to 8 and Comparative Examples 1 to 6 were tested using the stretching liquid according to the above test method. The test results are shown in Table 2.

[0082] Table 2

[0083] <![CDATA[Fuel consumption (g / m 2 )]]> Friction coefficient Cleaning performance (%) Example 1 7.2 0.09 99.7 Example 2 9.7 0.1 99.6 Example 3 8.3 0.11 99.3 Example 4 7.8 0.27 94.2 Example 5 19.7 0.11 89.5 Example 6 9.4 0.13 87.3 Example 7 8.5 0.12 85.4 Example 8 11.8 0.17 93.6 Comparative Example 1 3.2 0.35 89.3 Comparative Example 2 5.5 0.17 85.4 Comparative Example 3 11.4 0.14 80.6 Comparative Example 4 9.6 0.28 92.5 Comparative Example 5 5.3 0.29 88.5 Comparative Example 6 28.3 0.12 53.2

[0084] From the data in Table 2, we can see that:

[0085] (1) The oil consumption of the aluminum battery shell stretching liquid provided in Examples 1 to 3 is 7.2 to 9.7 g / m 2 The friction coefficient is only 0.09-0.11, and the cleaning performance shows that the percentage of tensile liquid removed from the steel plate surface is as high as 99.3-99.7%. It has excellent water solubility, easy cleaning and low oil consumption.

[0086] (2) Compared with Example 1, the friction coefficient of the stretching liquid for aluminum battery shell provided in Comparative Example 1 is greatly increased, and the lubricity is greatly reduced; the lubricity and cleaning properties of the stretching liquid for aluminum battery shell provided in Comparative Example 2 cannot meet the requirements; the cleaning performance of the stretching liquid for aluminum battery shell provided in Comparative Example 3 is significantly reduced; the friction coefficient of the stretching liquid for aluminum battery shell provided in Comparative Example 4 is significantly increased, and the lubricity cannot meet the requirements.

[0087] (3) Compared with Example 1, the friction coefficient of the conventional water-based stretching fluid provided in Example 5 is abnormally high, and the lubricity is insufficient, which cannot meet the high-speed stamping requirements of the battery shell; the oil consumption of the conventional oil-based stretching fluid provided in Example 6 is too high, and there is too much oil on the surface of the workpiece, resulting in a significant reduction in cleaning performance.

[0088] (4) Further compared with Example 1, the lubricity of the aluminum battery shell stretching liquid provided in Example 4 is insufficient; the oil consumption of the aluminum battery shell stretching liquid provided in Example 5 is high; and the cleaning performance of the aluminum battery shell stretching liquid provided in Examples 6 to 7 is reduced to varying degrees.

[0089] The applicant declares that the present invention illustrates a water-based friction modifier, a stretching liquid for aluminum battery shells, and a preparation method and application thereof through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A water-based friction modifier, characterized in that: The water-based friction modifier includes C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate.

2. The water-based friction modifier according to claim 1, characterized in that The mass ratio of the C21 cyclic dibasic acid block polyether ester, ethylenediamine polyoxyethylene polyoxypropylene ether and C12-14 alcohol polyoxyethylene ether phosphate is (1-5):(2-7):(1.5-4.5).

3. The water-based friction modifier according to claim 1 or 2, characterized in that: The ethylenediamine polyoxyethylene polyoxypropylene ether is obtained by polymerization of ethylenediamine, ethylene oxide and propylene oxide; Preferably, the C21 cyclic dibasic acid block polyether ester has a structure as shown in the following formula I:

4. A stretching liquid for an aluminum battery shell, characterized in that: The stretching liquid for aluminum battery shell contains base oil, vegetable oil, fatty amine, fatty acid, surfactant, the water-based friction modifier according to any one of claims 1 to 3, and water.

5. The stretching liquid for aluminum battery shell according to claim 4, characterized in that: Based on the total weight of 100%, the amounts of the various components contained in the aluminum battery shell stretching liquid are as follows:

6. The stretching liquid for aluminum battery shell according to claim 4 or 5, characterized in that: The base oil includes three types of base oils; Preferably, the vegetable oil comprises rapeseed oil and / or oxidized soybean oil.

7. The stretching liquid for aluminum battery shell according to any one of claims 4 to 6, characterized in that: The fatty amine includes any one of triethanolamine, isopropanolamine or diethylene glycolamine or a combination of at least two thereof; Preferably, the fatty acid comprises any one or a combination of at least two of polymerized ricinoleic acid, oleic acid, isononanoic acid or C21 dibasic acid; Preferably, the surfactant comprises C16-C18 fatty alcohol polyoxyethylene ether and / or Span 80; Preferably, the water is deionized water.

8. The stretching liquid for aluminum battery shell according to any one of claims 4 to 7, characterized in that: The aluminum battery shell stretching liquid further includes any one or a combination of at least two of a coupling agent, an inhibitor or a rust inhibitor; Preferably, the coupling agent comprises a C14-15 alcohol; Preferably, the inhibitor comprises benzotriazole; Preferably, the rust inhibitor comprises sodium petroleum sulfonate.

9. A method for preparing a stretching liquid for an aluminum battery shell as claimed in any one of claims 5 to 8, characterized in that: The preparation method comprises: uniformly mixing base oil, vegetable oil, fatty amine, fatty acid, surfactant, the water-based friction modifier as described in any one of claims 1 to 3, water, optionally a coupling agent, optionally an inhibitor and optionally a rust inhibitor to obtain the stretching liquid for the aluminum battery shell.

10. Use of the water-based friction modifier as claimed in any one of claims 1 to 3 or the stretching liquid for aluminum battery shell as claimed in any one of claims 4 to 8 in the preparation of automotive power batteries.

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