A Dyn hold cleaning agent for battery cover plates and a cleaning method

Abstract

The present invention relates to the technical field of battery component processing, and provides a Dyn hold cleaner for battery covers and a cleaning method. The cleaner is composed of components in the following mass percentages: 40% - 65% of a hydrocarbon solvent, 3% - 15% of an organic base, and 20% - 50% of a co-solvent. The hydrocarbon solvent is one of synthetic isoparaffins, dearomatized fluids, Fischer-Tropsch synthetic paraffins, isoparaffins, or refined C11. The organic base is one or more of monoethanolamine, triethanolamine, isopropanolamine, diethylene glycolamine, and 2-amino-2-methyl-1-propanol. The present invention can effectively remove various dirt such as stamping oil residues on the surface of the battery cover. After cleaning, there is no white spot residue on the cover surface, the cleaner does not corrode the workpiece, and there is no adverse effect on the appearance of the workpiece; the initial Dyn value after cleaning is greater than 54 mN / m, and the Dyn value remains undiminished after 15 days of storage. Fundamentally, the problem of Dyn attenuation on the surface of the workpiece during storage and turnover is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery component processing, and in particular to a dyno retention cleaning agent for battery covers and a cleaning method therefor. Background Art

[0002] In recent years, the new energy vehicle market in China has witnessed unexpected development, which has simultaneously driven the high-speed development of upstream and downstream enterprises in the industrial chain. In particular, power batteries, which are one of the core components of new energy vehicles. The battery cover of a power battery is a key component, consisting of a top cover sheet, an explosion-proof valve, a flip valve, positive and negative electrode components, etc. The materials of the battery cover of a power battery are Al3003 and Al1060, and it is mainly formed by stamping. Before processes such as welding, gluing, and assembly, it is necessary to clean the dirt such as stamping oil remaining on the surface of the workpiece to ensure the surface cleanliness of the workpiece, which has an important impact on the subsequent processing quality of this component.

[0003] The surface tension coefficient of an object can be quickly determined on-site during production by using a dyno pen to test the surface cleanliness of parts. Generally, it is required that the dyno of the battery cover surface after cleaning is not less than 38 mN / m, and the dyno remains undiminished after 15 days of storage.

[0004] Currently, the widely used cleaning agents for battery covers are mainly water-based cleaning agents and solvent-based cleaning agents. Water-based cleaning agents have the characteristics of no flash point, non-flammable and non-explosive, and safe to use. However, it is necessary to treat and discharge the production wastewater. Currently, some regions or industrial parks have begun to restrict the use of water-based cleaning agents to avoid the generation of wastewater. Among solvent-based cleaning agents, ODS-based cleaning agents such as trichloroethylene and chloroform will damage the atmospheric ozone layer and harm the health of operators due to the volatilization of organic solvents. Non-ODS solvent-based cleaning agents have the advantages of being recyclable by re-distillation and not generating waste liquid, but there are problems such as a relatively low initial dyno value after cleaning, making it difficult to meet the requirement of a dyno greater than 38 mN / m, and they have timeliness. Generally, the dyno value begins to decay 2 - 7 days after cleaning. Even if the storage environment is changed or measures such as vacuum packaging are adopted, the phenomenon of dyno decay still exists. This results in changes in the welding, bonding, and assembly surfaces during the storage and turnover period of the workpiece, greatly increasing the rejection rate of the product in subsequent processes. Currently, most enterprises can only avoid this phenomenon through passive means such as adjusting the production plan. Therefore, it is necessary to invent a cleaning agent that can prevent the dyno value of the cover surface from decaying after cleaning to fundamentally solve this technical problem. Summary of the Invention

[0005] In order to solve the technical problems in the prior art that the initial dyno value after cleaning is relatively low, it is difficult to meet the dyno requirements, and it has timeliness. Generally, the dyno value begins to decay 2 - 7 days after cleaning, a dyno retention cleaning agent for battery covers and a cleaning method therefor are provided.

[0006] The first aspect provides a dyn value maintaining cleaning agent for battery cover plates. The cleaning agent comprises components in the following mass percentages: 40%-65% of a hydrocarbon solvent, 3%-15% of an organic base, and 20%-50% of a co-solvent.

[0007] The hydrocarbon solvent is used to remove oil stains; the organic base is water-soluble and insoluble in the hydrocarbon solvent; the co-solvent is used to dissolve the organic base, and has a good penetration effect in combination with the dissolved organic base. Due to the penetration effect, the cleaning agent can better penetrate into the interior of the cover plate workpiece to clean the oil stains remaining inside the cover plate workpiece, and avoid the influence of the reverse osmosis of the internal oil stains to the outside on the dyn value during cleaning and storage.

[0008] Further, the hydrocarbon solvent is one of synthetic isoparaffin, de-aromaticized fluid, Fischer-Tropsch synthetic paraffin, isoparaffin or refined C11.

[0009] Further, the organic base is one or more of monoethanolamine, triethanolamine, isopropanolamine, diethylene glycol amine or 2-amino-2-methyl-1-propanol.

[0010] Further, the co-solvent is one or more of ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, ethylene glycol tert-butyl ether, ethylene glycol propyl ether or dipropylene glycol monobutyl ether.

[0011] Further, the components of the cleaning agent further include a co-cleaning solvent, and the mass percentage of the co-cleaning solvent is less than or equal to 10%.

[0012] The co-cleaning solvent has a certain cleaning effect and permeability, enabling the solvent to clean the oil stains penetrating inside the cover plate.

[0013] Further, the co-cleaning solvent is one or more of 3-methoxy-3-methyl-1-butanol, N,N-dimethylformamide or dimethyl sulfoxide.

[0014] Further, the components of the cleaning agent further include an antioxidant, and the mass percentage of the antioxidant is less than or equal to 0.05%.

[0015] Further, the antioxidant is 2,6-di-tert-butyl-p-cresol or 2,6-di-tert-butyl mixed phenol.

[0016] The antioxidant is used to extend the service life of materials and products during storage and use.

[0017] The second aspect provides a method for maintaining the dyn value of a battery cover plate during cleaning, characterized in that the method comprises the following steps:

[0018] (1) Ultrasonic cleaning, using the above-mentioned dyn value maintaining cleaning agent for battery cover plates for ultrasonic cleaning, with the cleaning temperature being 25°C - 40°C and the cleaning time being 60s - 240s;

[0019] (2) Use hydrocarbon solvent for vapor-phase cleaning, and store it in boxes after vacuum drying.

[0020] Furthermore, the hydrocarbon solvent in the step (2) is the above-mentioned hydrocarbon solvent.

[0021] The advantages of the present invention are as follows:

[0022] The cleaning agent of the present invention is a colorless and transparent liquid, which can effectively remove various dirt such as stamping oil residues on the surface of the battery cover plate, has good cleaning effect, and does not corrode the cleaning equipment; it does not contain toxic and harmful substances such as halogens and aromatics, does not contain ozone-depleting and global warming substances, is harmless to humans, and is environmentally friendly, and can ensure the effectiveness, reliability and safety of battery component cleaning; when using the cleaning method of the present invention to clean the battery cover plate, there is no white spot residue on the surface of the cover plate after cleaning, the cleaning agent does not corrode the workpiece, and has no adverse effect on the appearance of the workpiece; the initial dyne value after cleaning is greater than 54 mN / m, and the dyne does not decay after 15 days of storage. No black smoke is generated during welding, which greatly reduces the laser welding defects of the cover plate. At the same time, it can effectively reduce the quality defects in the processes such as workpiece gluing and assembly, and reduce the processing defect rate in actual production. The cleaning method uses a hydrocarbon solvent with a relatively high flash point for rinsing, combined with a vapor-phase cleaning device, which can be distilled and recovered, and has good economy. Therefore, the overall solution fundamentally solves the problem of dyne attenuation on the surface of workpieces during storage and turnover. Description of the Drawings

[0023] Figure 1 It is the optical microscope observation diagram before cleaning in the panel appearance detection experiment of the present invention;

[0024] Figure 2 It is the optical microscope observation diagram at different times after cleaning in the panel appearance detection experiment of the present invention; Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] It should be noted that the installation methods and technical terms mentioned in the present invention are all technical terms that are already well-known in the technical field, so no more explanations will be made. In addition, the same reference numerals are used for the same components, but this does not affect and should not constitute an accurate understanding of the technical solution by those skilled in the art.

[0027] A dyno retention cleaning agent for battery covers, the cleaning agent comprising components in the following mass percentages: 40%-65% hydrocarbon solvent, 3%-15% organic base, 20%-50% co-solvent, 0-10% auxiliary cleaning solvent, 0-0.05% antioxidant.

[0028] The hydrocarbon solvent is used to remove oil stains; the organic base is water-soluble and insoluble in the hydrocarbon solvent; the co-solvent is used to dissolve the organic base and has a good penetration effect in combination with the dissolution of the organic base.

[0029] The hydrocarbon solvent is one of synthetic isoparaffins, dearomatized fluids, Fischer-Tropsch synthetic paraffins, isoparaffins or refined C11; rinsing with a hydrocarbon solvent with a relatively high flash point, combined with a gas-phase cleaning device, can be distilled and recovered, having good economy. The organic base is one or more of monoethanolamine, triethanolamine, isopropanolamine, diethylene glycolamine, 2-amino-2-methyl-1-propanol; the co-solvent is one or more of ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, ethylene glycol tert-butyl ether, ethylene glycol propyl ether, dipropylene glycol monobutyl ether; the components of the cleaning agent further include 0-10% by mass of an auxiliary cleaning solvent. The auxiliary cleaning solvent is one or more of 3-methoxy-3-methyl-1-butanol, N,N-dimethylformamide, dimethyl sulfoxide. The antioxidant is 2,6-di-tert-butyl-p-cresol or 2,6-di-tert-butyl mixed phenol.

[0030] The cleaning agent as a whole is a colorless and transparent liquid. The cleaning agent does not contain toxic and harmful substances such as halogens and aromatics, does not contain ozone-depleting and global warming substances, is harmless to humans, is environmentally friendly, and can ensure the effectiveness, reliability and safety of the cleaning of battery parts.

[0031] Due to the osmotic effect, the cleaning agent can better penetrate into the interior of the cover workpiece to clean the oil stains remaining inside the cover workpiece, avoiding the reverse osmosis effect of the internal oil stains to the outside during cleaning and storage, which affects the dyno value. The auxiliary cleaning solvent has a certain cleaning effect and has permeability, enabling the solvent to clean the oil stains penetrating inside the cover. It prolongs the service life of materials and products during storage and use.

[0032] In a second aspect, a method for maintaining the dyno of a battery cover is provided, characterized in that: the method comprises the following steps:

[0033] (1) Ultrasonic cleaning, using the above-mentioned dyno retention cleaning agent for battery covers for ultrasonic cleaning, the cleaning temperature is 25-40°C, and the cleaning time is 60-240 s;

[0034] (2) Gas-phase cleaning with a hydrocarbon solvent, followed by vacuum drying and packing for storage.

[0035] Further, the hydrocarbon solvent in step (2) is the above-mentioned hydrocarbon solvent

[0036] Example 1

[0037] A dyn hold cleaner for battery cover plate, and its raw material composition and weight percentage are as follows:

[0038] Isopar TM L 40%, triethanolamine 10%, diethylene glycol butyl ether 45%, 3-methoxy-3-methyl-1-butanol 4.95%, 2,6-di-tert-butyl-p-cresol 0.05%.

[0039] Use the above dyn hold cleaner for battery cover plate to clean the Al3003 aluminum alloy cover plate, and the cleaning method steps are as follows:

[0040] Ultrasonic cleaning of the dyn hold cleaner for battery cover plate, cleaning temperature 40°C, cleaning time 240s → Hydrocarbon solvent vapor cleaning → Vacuum drying. Among them, the hydrocarbon solvent is Isopar TM L.

[0041] Example 2

[0042] A dyn hold cleaner for battery cover plate, and its raw material composition and weight percentage are as follows:

[0043] Refined C11 54%, isopropanolamine 8%, ethylene glycol tert-butyl ether 30%, diethylene glycol butyl ether 3%, N,N-dimethylformamide 5%.

[0044] Use the above dyn hold cleaner for battery cover plate to clean the Al3003 aluminum alloy cover plate, and the cleaning method steps are as follows:

[0045] Ultrasonic cleaning of the dyn hold cleaner for battery cover plate, cleaning temperature 25°C, cleaning time 120s → Hydrocarbon solvent vapor cleaning → Vacuum drying. Among them, the hydrocarbon solvent is refined C11.

[0046] Example 3

[0047] A dyn hold cleaner for battery cover plate, and its raw material composition and weight percentage are as follows:

[0048] Aromatics-free fluid Exxsol TM D6 65%, 2-amino-2-methyl-1-propanol 5%, diethylene glycol butyl ether 20%, ethylene glycol tert-butyl ether 10%.

[0049] Use the above dyn hold cleaner for battery cover plate to clean the Al3003 aluminum alloy cover plate, and the cleaning method steps are as follows:

[0050] Ultrasonic cleaning of the dyn hold cleaner for battery cover plate, cleaning temperature 40°C, cleaning time 240s → Hydrocarbon solvent vapor cleaning → Vacuum drying. Among them, the hydrocarbon solvent is ExxsolTM D60

[0051] Example 4

[0052] A dyno retention cleaning agent for battery covers, with the raw material composition and weight percentage as follows:

[0053] Fischer-Tropsch synthetic paraffin NacoSolD60 40%, diethanolamine 12%, ethylene glycol monobutyl ether 25%, dipropylene glycol monobutyl ether 15%, dimethyl sulfoxide 7.95%, 2,6-di-tert-butyl mixed phenol 0.05%.

[0054] Use the above dyno retention cleaning agent for battery covers to clean the Al3003 aluminum alloy cover, and the cleaning method steps are as follows:

[0055] Ultrasonic cleaning of the dyno retention cleaning agent for battery covers, cleaning temperature 40°C, cleaning time 240s → hydrocarbon solvent vapor cleaning → vacuum drying. Among them, the hydrocarbon solvent is NacoSolD60.

[0056] Dyno value detection experiment

[0057] Use the cleaning agents and cleaning methods of Examples 1 to 4 to clean the cover workpieces. After the workpieces are cooled to room temperature, immediately use a dyno pen to detect the dyno value on the surface of the cover. After testing, store the cover workpieces in a sealed bag and conduct a dyno pen test every 5 days for a total of 15 days. The results are shown in Table 1.

[0058] It can be seen from Table 1 that the initial dyno value of the cover workpieces cleaned with the cleaning agents of Examples 1 to 4 is greater than 54 mN / m, and the dyno remains non-decaying after being stored for 15 days, solving the problem that the dyno value starts to decay 2 - 7 days after cleaning in the prior art. No black smoke is generated during welding, greatly reducing the laser welding defects of the cover, and at the same time, it can effectively reduce the quality defects in processes such as workpiece gluing and assembly, and reduce the processing defect rate in actual production.

[0059] Table 1 Dyno value detection results

[0060] Detection time Example 1 Example 2 Example 3 Example 4 Initial dyne value > 56 mN / m > 54 mN / m > 56 mN / m > 56 mN / m Dyne value on the 5th day > 56 mN / m > 54 mN / m > 56 mN / m > 56 mN / m Dyne value on the 10th day > 56 mN / m > 54 mN / m > 56 mN / m > 56 mN / m Dyne value on the 11th day > 56 mN / m > 54 mN / m > 56 mN / m > 56 mN / m

[0061] The dyno pen is selected from German ARCOTESY

[0062] Panel appearance detection experiment

[0063] Combined Figure 1 and Figure 2Description is made as follows. The cleaning agent prepared in Example 1 and the cleaning method are selected to clean the cover plate workpiece. After the workpiece is cooled to room temperature, a three-magnification measuring microscope is used to visually inspect the cover plate before and after cleaning at a magnification of 200 times to check the change of the plate surface. After the initial inspection, the cover plate workpiece is stored in a sealed plastic bag, and the change of the plate surface is checked every 5 days for a total of 15 days of testing.

[0064] It can be seen from Figure 2 that the change of the plate surface of the cover plate workpiece remains consistent after cleaning. There is no white spot residue on the surface of the cover plate after cleaning, the cleaning agent does not corrode the workpiece, and there is no adverse effect on the appearance of the workpiece. It can effectively remove various dirt such as stamping oil remaining on the surface of the battery cover plate, and has a good cleaning effect without corroding the cleaning equipment.

[0065] Therefore, the cleaning agent and the cleaning method provided by the present invention have a good cleaning effect on the battery cover plate workpiece. Not only the oil stains on the outside of the cover plate workpiece are cleaned, but also due to the good penetration effect of the cooperation of the hydrocarbon solvent and the organic base in dissolution. The penetration effect enables the cleaning agent to better penetrate into the inside of the cover plate workpiece to clean the oil stains remaining inside the cover plate workpiece. After being stored for a certain period of time, there is no obvious change in the plate surface.

[0066] For those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0067] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A dyno retention cleaning agent for a battery cover plate, characterized in that, The cleaning agent comprises components in the following mass percentages: 40%-65% of hydrocarbon solvent, 3%-15% of organic base, and 20%-50% of cosolvent; the components of the cleaning agent further include a washing aid solvent and an antioxidant, the mass percentage of the washing aid solvent is less than or equal to 10%; the mass percentage of the antioxidant is less than or equal to 0.05%; the organic base is one or more of monoethanolamine, triethanolamine, isopropanolamine, diethylene glycol amine, or 2-amino-2-methyl-1-propanol.

2. The dyno retention cleaning agent for a battery cover plate according to claim 1, characterized in that, The hydrocarbon solvent is one of synthetic isoparaffin, dearomatized fluid, Fischer-Tropsch synthetic paraffin, isoparaffin, or refined C11.

3. A dyno retention cleaning agent for a battery cover plate according to claim 1, characterized in that, The cosolvent is one or more of ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, ethylene glycol tert-butyl ether, ethylene glycol propyl ether, or dipropylene glycol monobutyl ether.

4. A dyno retention cleaning agent for a battery cover plate according to claim 3, characterized in that, The washing aid solvent is one or more of 3-methoxy-3-methyl-1-butanol, N,N-dimethylformamide, or dimethyl sulfoxide.

5. A dyno retention cleaning agent for a battery cover plate according to claim 4, characterized in that, The antioxidant is 2,6-di-tert-butyl-p-cresol or 2,6-di-tert-butyl mixed phenol.

6. A cleaning method for a dyn hold cleaner of a battery cover plate according to any one of claims 1-5, characterized in that, The method comprises the following steps: (1) Ultrasonic cleaning, using the dyno retention cleaning agent for battery cover plates according to any one of claims 1-5 to perform ultrasonic cleaning, with the cleaning temperature being 25°C - 40°C and the cleaning time being 60s - 240s; (2) Vapor-phase cleaning with a hydrocarbon solvent, followed by vacuum drying and packing for storage.

7. The cleaning method according to claim 6, wherein The hydrocarbon solvent in step (2) is one of synthetic isoparaffin, dearomatized fluid, Fischer-Tropsch synthetic paraffin, isoparaffin, or refined C11.

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