Battery manufacturing method and battery

Abstract

The present invention provides a battery manufacturing method and a battery, belonging to the field of battery technology, wherein the battery manufacturing method comprises: assembling a core pack, a top cover and an outer shell to form a battery body; pre-treating the outer surface of the battery body; spraying insulating powder on the outer surface of the pre-treated battery body by a powder spraying process, and curing to form an insulating layer; baking the cured battery body, and injecting electrolyte after baking. The battery manufacturing method provided by the present invention directly pre-treats, sprays insulating powder and cures on the surface of the assembled battery body, eliminating the process of coating the outside of the battery, and the process is simple, improving the processing efficiency and processing quality of the insulating layer. When the powder spraying process is performed, the battery body is not charged, the powder spraying process is safer, and a high-temperature curing method can be used to improve the processing efficiency. The high-temperature curing process will not affect the electrolyte, ensuring the battery quality.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery manufacturing method and a battery. Background Art

[0002] Lithium-ion power batteries have the advantages of high voltage, high energy, small size, light weight, and wide operating temperature range. Lithium-ion battery packs have been widely used in various fields, especially in the field of electric vehicles. The battery shell is generally made of aluminum. Since it is a metal material, an insulating film of polypropylene or polyester is usually used on the surface of the shell to prevent the metal shell from being connected to the pole, thereby causing a short circuit or even thermal runaway of the entire battery. On the other hand, it can reduce the damage to the battery shell caused by scratches from foreign objects to a certain extent, maintaining the beauty of the battery.

[0003] However, as shown in Chinese patent documents CN209626337U, CN110931836A, CN108832148A, etc., when coating the battery casing, tooling clamping and the action of the coating mechanism are required, the steps are cumbersome and time-consuming, and the coating process is prone to abnormalities such as coating wrinkles and bubbles, and the rework rate is high, which affects production efficiency; as shown in Chinese patent documents CN113904039A and CN108666484A, an insulating layer is first provided on the outside of the battery casing and the top cover, and then the core package, the casing and the top cover are assembled. However, if an insulating layer is provided on the top of the casing, an abnormality such as explosion points and welding slag will be generated when the casing and the top cover are welded; if isolation treatment is performed at the opening position of the casing and a welding position of the top cover is reserved, the casing at the reserved position will be exposed, and the overall insulation performance requirements cannot be guaranteed. Furthermore, in the prior art, usually after the electrolyte is injected into the assembled battery, the external insulating layer is set and cured. Since the electrolyte is sensitive to temperature, only low-temperature curing can be used during curing, which prolongs the curing time and affects the manufacturing efficiency of the battery. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low production efficiency and poor insulation performance of battery manufacturing in the prior art, thereby providing a battery manufacturing method and a battery.

[0005] In order to solve the above problems, the present invention provides a battery manufacturing method, comprising: assembling a core pack, a top cover and an outer shell to form a battery body; pre-treating the outer surface of the battery body; spraying insulating powder on the outer surface of the pre-treated battery body using a powder spraying process, and curing to form an insulating layer; baking the cured battery body, and injecting electrolyte into the battery body after baking.

[0006] Optionally, the curing temperature is 50°C-150°C.

[0007] Optionally, the powder spraying process adopts powder spraying in an electrostatic field or powder spraying in a non-electrostatic field.

[0008] Optionally, the powder spraying process is one-time powder spraying or multiple-time powder spraying.

[0009] Optionally, the powder spraying process includes primary powder spraying and secondary powder spraying, pre-curing is performed after the primary powder spraying, and curing is performed after the secondary powder spraying.

[0010] Optionally, the powder spraying process adopts powder spraying in an electrostatic field; in the first powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the pre-curing process, the pre-curing temperature is 20℃-40℃, and the pre-curing time is 20min-30min; in the second powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the curing process, the curing temperature is 50℃-150℃, and the curing time is 20min-30min.

[0011] Optionally, the pretreatment includes at least one of degreasing, rust removal, water washing, silane treatment, plasma treatment, laser cleaning, pickling, phosphating, and drying.

[0012] Optionally, the pretreatment includes pre-degreasing-degreasing-one water washing-one pure water washing-silane treatment-second water washing-second pure water washing-drying.

[0013] Optionally, the total alkalinity of the pre-degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spray pressure is 0.15MPa-0.25MPa; the total alkalinity of the degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spray pressure is 0.15MPa-0.25MPa; the pH of the first water washing solution is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the pH of the pure water for the first pure water washing is ≤10, and the spray pressure is 0.15MPa -0.25MPa; during the silane treatment process, the concentration of silane active matter is 0.3pt-0.5pt, the pH value is 8-10, and the spray pressure is 0.15MPa-0.25MPa; the pH of the secondary water washing solution is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the pH of the pure water for the secondary pure water washing is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the drying temperature is 60℃-100℃, and the drying time is 15min-25min.

[0014] Optionally, the pole, explosion-proof valve and information code area of ​​the top cover are isolated to form a non-powder spraying area, and the rest of the outer surface of the battery body is a powder spraying area, and the powder spraying area is subjected to the pretreatment.

[0015] Optionally, the isolation treatment includes coating the non-powder spraying area; or, when a hanger is used to hang the battery body or a clamp is used to clamp the battery body, the hanger or the clamp simultaneously covers the non-powder spraying area.

[0016] Optionally, when the battery body is suspended by a hanger, the battery body is placed upright with the non-powder spraying area facing upward; or, when the battery body is clamped by a clamp, the battery body is inverted with the non-powder spraying area facing downward.

[0017] Optionally, the curing method includes at least one of light curing, heat curing, and room temperature curing.

[0018] Optionally, the battery manufacturing method further comprises: performing appearance inspection, insulation layer inspection, and performance inspection on the battery body with the insulation layer formed thereon; and isolating and transporting the battery body after the inspection, or transporting it to a baking station for baking after negative pressure dust removal.

[0019] Optionally, the insulating layer has a thickness of 1 μm-500 μm.

[0020] Optionally, the insulating powder includes at least one of epoxy resin, epoxy phenolic, mica, titanium dioxide, boron nitride, silicon carbide, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, aluminum nitride, and basic aluminum oxide.

[0021] Optionally, the insulating powder includes a main component and additives; the main component includes at least one of epoxy resin, epoxy phenolic, mica, titanium dioxide, boron nitride, silicon carbide, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, aluminum nitride, and alkaline aluminum oxide; the additives include a curing agent, a filler, and a pigment.

[0022] The present invention also provides a battery, which is prepared by the above-mentioned battery manufacturing method.

[0023] The present invention has the following advantages:

[0024] 1. The present invention provides a battery manufacturing method, which directly performs pretreatment, spraying of insulating powder and curing on the surface of the assembled battery body, so as to directly form an insulating layer on the surface of the battery body, eliminating the process of coating the outside of the battery, and the process is simple, which improves the processing efficiency and processing quality of the insulating layer; the insulating powder is directly sprayed on the outer surface of the finished battery body to avoid the influence of the outer shell surface insulating layer on the top cover welding process, and ensure that the overall insulation performance of the battery meets the requirements; and the electrolyte is injected after the insulating layer is cured and the battery body is baked, so that the battery body is not charged during the powder spraying process, the powder spraying process is safer, and a high-temperature curing method can be used to improve the processing efficiency. The high-temperature curing process will not affect the electrolyte, thereby ensuring the battery quality.

[0025] 2. The present invention provides a battery manufacturing method which adopts an insulating powder spraying process, the powder is recyclable, has a high utilization rate, and is environmentally friendly.

[0026] 3. The present invention provides a battery manufacturing method, in which the curing temperature can be as high as 150°C, which increases the curing speed without affecting the battery performance, thereby improving the battery production efficiency. The curing temperature can preheat the battery cell before baking and reduce the battery cell baking time.

[0027] 4. The present invention provides a battery manufacturing method, in which the powder spraying process adopts secondary powder spraying and secondary curing, and the thickness consistency of the insulation layer is high, which can improve the overall insulation performance of the battery cell.

[0028] 5. The present invention provides a battery manufacturing method, which performs pre-treatments such as degreasing, water washing, and drying on the battery body before powder spraying to ensure the adhesion of the battery body surface to the insulating powder.

[0029] 6. A battery manufacturing method provided by the present invention adopts isolated transportation or transportation after negative pressure cleaning when transporting the battery body with an insulating layer formed to a baking station to avoid the powder particles from spreading to other areas and ensure the cleanliness of the battery manufacturing environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A flow chart showing a battery manufacturing method provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the main structure of a battery provided by an embodiment of the present invention is shown;

[0033] Figure 3 for Figure 2 Left view of

[0034] Figure 4 for Figure 2 Top view of the .

[0035] Description of reference numerals:

[0036] 10. Casing; 20. Top cover; 21. Pole; 22. Explosion-proof valve; 23. Information code area. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1 A specific implementation of the battery manufacturing method shown includes the following steps:

[0042] Step S10: Assembling the core pack, the top cover 20 and the outer shell 10 to form a battery body;

[0043] Step S20: pre-treating the outer surface of the battery body;

[0044] Step S30: using a powder spraying process to spray insulating powder onto the outer surface of the pre-treated battery body, and curing the powder to form an insulating layer;

[0045] Step S40: baking the solidified battery body and injecting electrolyte after baking.

[0046] The surface of the assembled battery body is directly pretreated, sprayed with insulating powder and cured to form an insulating layer directly on the surface of the battery body, eliminating the process of coating the outside of the battery. The process is simple, and the processing efficiency and quality of the insulating layer are improved. In addition, the electrolyte is injected after the insulating layer is cured and the battery body is baked. Therefore, the battery body is not charged during the powder spraying process, and the powder spraying process is safer. A high-temperature curing method can be used to improve the processing efficiency. The high-temperature curing process will not affect the electrolyte, thereby ensuring the battery quality.

[0047] It is worth noting that in the prior art, the surface of a separate outer shell 10 is insulated, and then the treated outer shell 10, core package and top cover 20 are assembled. However, if an insulating layer is provided on the top of the outer shell 10, abnormalities such as explosion points and welding slag will occur when the outer shell 10 and the top cover 20 are welded; if an isolation treatment is performed at the opening position of the outer shell 10, and a welding position for the top cover 20 is reserved, the outer shell 10 at the reserved position will be exposed, and the overall insulation performance requirements cannot be guaranteed. Therefore, this embodiment adopts a powder spraying process of insulating powder directly on the outer surface of the finished battery body to avoid the influence of the insulating layer on the surface of the outer shell 10 on the welding process of the top cover 20, and to ensure that the insulation performance of the battery as a whole meets the requirements.

[0048] It should be noted that the “powder spraying” described in this embodiment refers to spraying the insulating material in powder form onto the battery body using a spray gun or other equipment.

[0049] It should be further explained that in the art, there is also a method of spraying or dipping insulating coating on the outer surface of the battery body and then curing it to form an insulating layer. The insulating coating refers to a liquid coating formed by mixing an insulating material with an organic solvent. Therefore, when the insulating coating is cured at high temperature, the organic solvent will volatilize, causing environmental pollution. In this embodiment, an insulating powder spraying process is adopted, and the powder is recyclable, has a high utilization rate, and is environmentally friendly. In addition, the insulating performance of the insulating layer itself is better than that of the PET film, and can withstand higher dielectric strength.

[0050] In step S30, the powder spraying process adopts the powder spraying method in the electrostatic field, and the powder spraying process includes primary powder spraying and secondary powder spraying, pre-curing is performed after the primary powder spraying, and curing is performed after the secondary powder spraying. Specifically, in the primary powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the pre-curing process, the pre-curing temperature is 20℃-40℃, and the pre-curing time is 20min-30min; in the secondary powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the curing process, the curing temperature is 115℃-125℃, and the curing time is 20min-30min.

[0051] The powder spraying process adopts secondary powder spraying and secondary curing, and the thickness of the insulation layer is highly consistent, which can improve the overall insulation performance of the battery cell.

[0052] It is worth noting that the powder spraying process may also be performed in a non-static field; the powder spraying process may be performed only once or more times, such as three times, four times, etc.

[0053] It should be noted that the curing temperature can be 50°C-150°C, which increases the curing speed without affecting the battery performance, thereby improving the battery production efficiency. The curing temperature can preheat the battery cell before baking and reduce the battery cell baking time. The curing method can adopt at least one of light curing, thermal curing, and room temperature curing.

[0054] It is worth noting that if the external insulation layer is set and cured after the electrolyte is injected into the assembled battery, low-temperature curing is required. Usually, the curing temperature of low-temperature curing is set at 20℃-80℃, and the curing time generally takes 24 hours. Therefore, the curing time is extended, affecting the manufacturing efficiency of the battery.

[0055] It should be further explained that the curing temperature is 50℃-150℃ to avoid the influence of excessively high temperature on the performance of the battery cell separator and electrode.

[0056] In step S20, the pretreatment includes at least one of degreasing, rust removal, water washing, silane treatment, plasma treatment, laser cleaning, pickling, phosphating, and drying.

[0057] In this embodiment, the pretreatment includes pre-degreasing-degreasing-one water washing-one pure water washing-silane treatment-secondary water washing-secondary pure water washing-drying. Specifically, the total alkalinity of the pre-degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spray pressure is 0.15MPa-0.25MPa; the total alkalinity of the degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spray pressure is 0.15MPa-0.25MPa; the pH of the first water washing solution is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the pure water pH of the first pure water washing is ≤10, and the spray pressure is 0.15MPa -0.25MPa; during the silane treatment process, the concentration of silane active matter is 0.3pt-0.5pt, the pH value is 8-10, and the spray pressure is 0.15MPa-0.25MPa; the pH of the secondary water washing solution is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the pH of the pure water for the secondary pure water washing is ≤10, and the spray pressure is 0.15MPa-0.25MPa; the drying temperature is 60℃-100℃, and the drying time is 15min-25min.

[0058] The battery body is pre-treated by degreasing, washing, drying, etc. before powder spraying to ensure the adhesion of the insulating powder to the surface of the battery body.

[0059] In this embodiment, the bonding strength of the insulating layer is ≥1Mpa, the adhesion is ≤level 1, and the hardness of the paint film is ≥2H, which can effectively prevent the insulating layer from falling off or scratches from being generated during transportation; the insulating layer has good oil resistance, water resistance, moisture and heat resistance, and salt spray resistance, and will not bubble or fall off during long-term use in a high temperature and high humidity environment, thereby improving the insulation reliability of the battery; the insulating layer has excellent flame retardant properties, which can effectively avoid the risk of burning the insulating layer when the battery contacts open flames, thereby improving battery reliability; the insulating layer has good resistance to electrolyte corrosion, which prevents battery leakage from corroding the surface of the battery casing, causing cross-contamination of the battery electrolyte inside the module and Pack.

[0060] In step S20, the pretreatment of the outer surface of the battery body can be performed only on the powder spraying area of ​​the powder spraying process. Specifically, the pole 21, the explosion-proof valve 22 and the information code area 23 of the top cover 20 are non-powder spraying areas, and the rest of the outer surface of the battery body is the powder spraying area, and powder spraying is performed in the pretreated powder spraying area to form an insulating layer.

[0061] It is worth noting that the information code can be a QR code.

[0062] In this embodiment, before powder spraying, the non-powder spraying area is isolated. Specifically, the non-powder spraying area can be covered and isolated, for example, the non-powder spraying area is coated.

[0063] It is worth noting that in the powder spraying process of the battery body, a hanger is used to hang the battery body or a clamp is used to clamp the battery body. Therefore, the hanger or the clamp can be used to cover the non-powder spraying area.

[0064] It should be further explained that when the battery body is hung by a hanger, the battery body is placed upright with the non-powder spraying area facing upward; or, when the battery body is clamped by a clamp, the battery body is inverted with the non-powder spraying area facing downward.

[0065] It can be understood that the hanger includes a hanging part, which has a certain covering range. When the hanging part is matched and connected with the battery top cover, the covering range of the hanging part is adapted to the non-powder spraying area; the clamp includes a clamping part, which can be clamped on the battery top cover, and the clamping part has a certain covering range. The covering range of the clamping part is adapted to the non-powder spraying area.

[0066] Of course, the loading method of the battery body can be adjusted according to the powder spraying angle of the spray gun.

[0067] In this embodiment, the housing 10 may be an aluminum housing, an aluminum-plastic housing, or a steel housing, and the shape of the housing 10 may be a cylindrical battery housing or a square battery housing.

[0068] In this embodiment, the insulating powder includes a main component and additives; the main component includes at least one of epoxy resin, epoxy phenolic, mica, titanium dioxide, boron nitride, silicon carbide, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, aluminum nitride, and alkaline aluminum oxide; the additives include curing agents, fillers, and pigments.

[0069] It is worth mentioning that pigments are used to mix the required color of powder, such as titanium dioxide, iron oxide and chrome yellow; fillers are generally solid particles used to improve powder properties, such as silicone resin.

[0070] In this embodiment, the thickness of the insulating layer is 1 μm-500 μm, for example, 20 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, etc.

[0071] like Figure 1 As shown, the battery manufacturing method also includes the following steps:

[0072] Conduct appearance inspection, insulation layer inspection, and performance inspection on the battery body forming the insulation layer;

[0073] After the inspection, the battery body is isolated and transported or transported to the baking station for baking after negative pressure dust removal.

[0074] When the battery cell body with the insulating layer formed is transported to the baking station, isolated transportation or transportation after negative pressure cleaning is adopted to prevent the powder particles from spreading to other areas and ensure the cleanliness of the battery manufacturing environment.

[0075] It is worth mentioning that the existing battery manufacturing process has strict requirements on cleanliness control. In order to prevent the dust in the powder spraying workshop from spreading to the battery cell top cover 20 welding and baking workshop, the powder spraying workshop needs to be isolated, and the battery body and channels entering the baking workshop need to be subjected to negative pressure dust removal. The exhaust volume needs to be set according to the volume of the powder spraying workshop and the channel volume.

[0076] When the battery body is transported, the battery body with the insulating layer formed thereon is placed on a stationary tray and then transported to a baking furnace for high-temperature baking. In this embodiment, the baking process can adopt a baking process in the prior art.

[0077] It is worth noting that the baking temperature is set at 95°C-105°C, and the baking time is 7 hours to 9 hours.

[0078] In this embodiment, the detection of the battery body includes insulation test, hardness test, bonding strength test, and the hardness, adhesion, insulation performance, corrosion resistance, etc. of the insulation layer on the surface of the battery are tested. Specifically, the appearance of the insulation layer is checked, and whether the isolation area is contaminated with powder is checked. The leakage current of the positive electrode of the battery body and the surface of the insulation layer is tested. The test pressure is 500±20Kgf, the test voltage is 2000±50V AC, and the test time is 1s-5s. It is required that the leakage current is detected to be ≤1mA. The thickness of the insulation layer is detected using a paint film meter, and the test thickness deviation is required to be ≤0.5mm. The specific test items, qualified standards and test results are shown in the following table.

[0079]

[0080]

[0081] Of course, the insulation layer performance test can select appropriate test items and methods according to actual needs.

[0082] This embodiment also provides Figures 2 to 4 A specific embodiment of the battery shown is prepared by the above-mentioned battery manufacturing method. The battery includes a battery body and an insulating layer formed on the outer surface of the battery body by powder spraying. Specifically, the battery body includes a core pack, an outer shell 10 and a top cover 20, and the top cover 20 is provided with a pole 21, an explosion-proof valve 22 and an information code area 23. In addition, the pole 21, the explosion-proof valve 22 and the information code area 23 of the top cover 20 are isolated to form a non-powder spraying area, and the rest of the outer surface of the battery body is a powder spraying area, and a powder spraying process is performed in the powder spraying area to form an insulating layer.

[0083] According to the above description, this patent application has the following advantages:

[0084] 1. Directly insulate the outer surface of the finished battery body. The process is simple, the thickness of the insulation layer is highly consistent, and the overall insulation performance of the battery can be improved;

[0085] 2. Use insulating powder for powder spraying, the powder is recyclable, with high utilization rate and environmentally friendly;

[0086] 3. Ensure that the battery has better insulation and anti-aging properties, thereby improving the safety performance of the battery.

[0087] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery manufacturing method, characterized in that: include: Assembling the core pack, the top cover (20) and the outer shell (10) to form a battery body; Pre-treating the outer surface of the battery body; The insulating powder is sprayed on the outer surface of the pre-treated battery body by a powder spraying process, and then cured to form an insulating layer; the powder spraying process includes primary powder spraying and secondary powder spraying, pre-curing is performed after the primary powder spraying, and curing is performed after the secondary powder spraying; The powder spraying process adopts the powder spraying method in the electrostatic field; in the primary powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the pre-curing process, the pre-curing temperature is 20℃-40℃, and the pre-curing time is 20min-30min; in the secondary powder spraying process, the electrostatic voltage is 60kV-80kV, and the vacuum powder suction pressure is 0.6MPa-0.8MPa; in the curing process, the curing temperature is 50℃-150℃, and the curing time is 20min-30min; The solidified battery body is baked, and after baking, an electrolyte is injected into the battery body.

2. The battery manufacturing method according to claim 1, characterized in that: The pretreatment includes at least one of degreasing, rust removal, water washing, silane treatment, plasma treatment, laser cleaning, pickling, phosphating, and drying.

3. The battery manufacturing method according to claim 1, characterized in that: The pretreatment includes pre-degreasing-degreasing-one water washing-one pure water washing-silane treatment-second water washing-second pure water washing-drying.

4. The battery manufacturing method according to claim 3, characterized in that: The total alkalinity of the pre-degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spraying pressure is 0.15MPa-0.25MPa; The total alkalinity of the degreasing solution is 7pt-9pt, the solution temperature is 45℃-55℃, and the spraying pressure is 0.15MPa-0.25MPa; The pH of the primary washing solution is ≤10, and the spraying pressure is 0.15MPa-0.25MPa; The pH of pure water for primary pure water cleaning is ≤10, and the spraying pressure is 0.15MPa-0.25MPa; During the silane treatment process, the concentration of silane active matter is 0.3pt-0.5pt, the pH value is 8-10, and the spray pressure is 0.15MPa-0.25MPa; The pH of the secondary washing solution is ≤10, and the spraying pressure is 0.15MPa-0.25MPa; The pH of the pure water for secondary pure water cleaning is ≤10, and the spraying pressure is 0.15MPa-0.25MPa; The drying temperature is 60℃-100℃, and the drying time is 15min-25min.

5. The battery manufacturing method according to claim 1, characterized in that: The pole (21), explosion-proof valve (22) and information code area (23) of the top cover (20) are isolated to form a non-powder spraying area, and the rest of the outer surface of the battery body is a powder spraying area, and the powder spraying area is subjected to the above-mentioned pretreatment.

6. The battery manufacturing method according to claim 5, characterized in that: The isolation treatment includes coating the non-powder spraying area; or, when the battery body is hung by a hanger or clamped by a clamp, the hanger or clamp simultaneously covers the non-powder spraying area.

7. The battery manufacturing method according to claim 6, characterized in that: When the battery body is suspended by a hanger, the battery body is placed upright with the non-powder spraying area facing upward; or, when the battery body is clamped by a clamp, the battery body is inverted with the non-powder spraying area facing downward.

8. The battery manufacturing method according to claim 1, characterized in that: The curing method includes at least one of light curing, heat curing, and room temperature curing.

9. The battery manufacturing method according to claim 1, characterized in that: The battery manufacturing method further comprises: Conduct appearance inspection, insulation layer inspection, and performance inspection on the battery body forming the insulation layer; After the inspection, the battery body is isolated and transported or transported to the baking station for baking after negative pressure dust removal.

10. The battery manufacturing method according to claim 1, characterized in that: The thickness of the insulating layer is 1 μm-500 μm.

11. The battery manufacturing method according to claim 1, characterized in that: The insulating powder includes at least one of epoxy resin, epoxy phenolic, mica, titanium dioxide, boron nitride, silicon carbide, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, aluminum nitride, and basic aluminum oxide.

12. The battery manufacturing method according to claim 1, characterized in that: The insulating powder comprises a main component and an additive; The main component includes at least one of epoxy resin, epoxy phenolic, mica, titanium dioxide, boron nitride, silicon carbide, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, aluminum nitride, and basic aluminum oxide; The additives include curing agents, fillers and pigments.

13. A battery, characterized in that: The battery is prepared by the battery manufacturing method described in any one of claims 1 to 12.

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