Polyurea spraying process for battery shell

Abstract

The invention discloses a battery shell polyurea spraying process which comprises the following steps: cleaning stains on the surface of a battery shell, and blocking each mounting hole of the battery shell by a shielding process; the battery shell is placed on a profiling tool; the surface temperature of the battery shell and the spraying pressure of spraying equipment are adjusted and controlled; spraying the surface of the battery shell by using spraying equipment; and taking down the shields of the mounting holes on the surface of the battery shell, and packaging and warehousing the battery shell after the polyurea coating is cured. The spraying device has the beneficial effects that by controlling the spraying environment and the spraying pressure and utilizing the arranged profiling tool, the problems of spraying splashing and bubbles are effectively prevented, the spraying yield is guaranteed, and then industrial production can be achieved.

Description

Technical Field

[0001] The present invention relates to a spraying process for battery casings, and more particularly to a polyurea spraying process for battery casings. Background Art

[0002] The battery casing is one of the important components of the battery system of new energy battery vehicles. It mainly plays a role in supporting and protecting the battery pack. In order to ensure the service life and safety of the battery casing, its surface is sprayed. Through the spraying process, a protective barrier can be formed on the surface of the battery casing to prevent the external environment from eroding the internal structure of the battery, thereby improving the insulation and corrosion resistance of the battery. In addition, the spraying process can also increase the aesthetics of the overall structure.

[0003] In the prior art, the polyurea coating is more environmentally friendly and has better performance than the traditional PVC coating, and is gradually widely used on the battery casings of new energy vehicles. However, currently limited by the process, the polyurea coating cannot be spray-coated in batches. Summary of the Invention

[0004] In view of this, the present invention provides a polyurea spraying process for battery casings, which can be spray-coated in batches to achieve mass production.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A polyurea spraying process for battery casings, characterized by comprising the following steps:

[0007] S1. Clean the stains on the surface of the battery casing, and block each mounting hole of the battery casing by a masking process;

[0008] S2. Place the battery casing on a profiling fixture;

[0009] S3. Adjust and control the surface temperature of the battery casing and the spraying pressure of the spraying equipment;

[0010] S4. Use the spraying equipment to spray the surface of the battery casing;

[0011] S5. Remove the masking materials from each mounting hole on the surface of the battery casing. After the polyurea coating is cured, pack the battery casing and store it in the warehouse.

[0012] By adopting the above steps, by controlling the spraying environment and spraying pressure, and then using the provided profiling fixture, the problems of spraying splashing and bubbles are effectively prevented, the yield rate of spraying is guaranteed, and thus industrial production can be realized.

[0013] Preferably: it further includes S6. Inspect the battery casing after spraying, and repair the defective battery casings. By adopting the above steps, the yield rate of polyurea spraying can be guaranteed.

[0014] Preferably, the shielding process described in S1 is to block the mounting hole with a sealing plug or a sealing sticker. With the above structure, it can ensure that the mounting hole is blocked, preventing the edge of the mounting hole from adhering to the polyurea coating and affecting the normal installation of the sleeve.

[0015] Preferably, the repair process specifically includes the following steps:

[0016] S6.1. Clean the polyurea coating at the damaged part;

[0017] S6.2. Apply an interface agent to the surface to be processed;

[0018] S6.3. Spray a polyurea coating on the surface to be processed.

[0019] By adopting the above steps, it can repair the positions on the battery case surface with poor spraying, ensuring the yield rate of the battery case.

[0020] Preferably, S6.1 is performed by grinding with a grinding machine. With the above structure, it can ensure that the unsprayed positions are cleaned, avoiding being affected by the original coating during repair and helping to ensure the quality of secondary spraying.

[0021] Preferably, the imitation jig includes a spraying base. A support table is provided in the middle of the spraying base, and a detachable support frame is provided on the top of the support table, which is adapted to the bottom of the battery case. With the above structure, the detachable support frame can facilitate the support and installation of the battery case, and at the same time, it can also facilitate the transfer of the battery case after spraying. The provided support table suspends the battery case in the air, which can avoid the phenomenon of polyurea accumulation around the battery case.

[0022] Preferably, the top area of the support frame is smaller than the top area of the spraying base. With the above structure, it can prevent the polyurea coating from being sprayed onto the ground, thereby reducing the cleaning difficulty.

[0023] Preferably, S5 is completed within 3 - 5 minutes after spraying. By adopting the above steps, it can avoid the curing of the polyurea coating and make it difficult to remove the sealing plug or the sealing sticker.

[0024] Preferably, the sealing plug includes a plugging portion and a supporting portion. The plugging portion is used to plug the mounting hole, and the supporting portion is used to support on the surface of the battery case. The sealing plug further includes a grasping portion and a shielding portion. The grasping portion is vertically arranged at the top of the supporting portion, and the shielding portion is arranged at the upper end of the supporting portion and extends circumferentially. With the above structure, the mounting hole can be better plugged by the provided plugging portion and supporting portion. The provided shielding portion can prevent the polyurea from accumulating at the edge of the supporting portion and the surface of the battery case during spraying, thereby avoiding the generation of burrs when removing the sealing plug. The grasping portion facilitates the installation of the sealing plug.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. By adopting the polyurea spraying process for the battery case provided by the present invention, through controlling the spraying environment and spraying pressure, and then using the provided profiling fixture, the problems of splashing and bubbling during spraying are effectively prevented, the qualified rate of spraying is ensured, and thus industrial production can be realized.

[0027] 2. The formed shielding portion on the sealing plug can prevent the polyurea from accumulating at the edge of the sealing plug and the surface of the battery case, and thus can avoid the generation of burrs at the position of the mounting hole corresponding to the battery case when removing the sealing plug. Description of the Drawings

[0028] Figure 1 is a flowchart of the polyurea spraying process for the battery case;

[0029] Figure 2 is a structural schematic diagram of the battery case 1;

[0030] Figure 3 is an exploded schematic diagram of the profiling fixture 3;

[0031] Figure 4 is a structural schematic diagram of the sealing plug 2. Detailed Embodiments

[0032] The following further illustrates the present invention in conjunction with the embodiments and the drawings.

[0033] The polyurea spraying process for the battery case in this embodiment is mainly used for spraying Figure 2 the shown battery case 1, and mounting holes 1a are distributed on the surface of the battery case 1.

[0034] As Figure 1 shown, a polyurea spraying process for a battery case includes the following steps:

[0035] S1. Clean the stains on the surface of the battery case 1, and block each mounting hole 1a of the battery case 1 through a masking process. In this embodiment, use alcohol and a clean rag to clean the oil stains, water stains, dust, etc. on the surface of the battery case 1. The masking process mainly uses Figure 4 the shown sealing plug 2 to block each mounting hole 1a. Among them, the sealing plug 2 has a blocking portion 2a and a supporting portion 2b. The blocking portion 2a is used to block inside the mounting hole 1a, and the supporting portion 2b is used to support on the surface of the battery case 1. The sealing plug 2 also has a grasping portion 2c and a shielding portion 2d. The grasping portion 2c is formed at the top of the supporting portion 2b and extends vertically upward. The grasping portion 2c can facilitate the removal of the sealing plug 2 from the mounting hole 1a. The shielding portion 2d is formed at the upper end of the supporting portion 2b and extends circumferentially. With such a design, when spraying polyurea, the shielding portion 2d can prevent polyurea accumulation between the edge of the supporting portion 2b and the battery case 1, so as to ensure that when the sealing plug 2 is removed, there will be no burrs at the position of the mounting hole 1a on the battery case 1. In addition, in this embodiment, a sealing sticker adapted to the cross-section of the mounting hole 1a can also be used to shield the mounting hole 1a to achieve blocking.

[0036] S2. Place the battery case 1 on the top of the imitation fixture 3 as shown in Figure 3 Figure. In this embodiment, the imitation fixture 3 includes a spraying base 3a. A support table 3b is provided at the middle position of the spraying base 3a. Among them, the support table 3b has support legs 3b1. A detachable support frame 3c is provided on the top of the support table 3b. The support frame 3c is adapted to the bottom surface structure of the battery case 1, and the top size of the support frame 3c is smaller than the top size of the spraying base 3a. When the spraying device sprays the spraying material on the area outside the battery case 1, through the design of the spraying base 3a and the support table 3b, it can prevent polyurea accumulation due to the contact between the circumferential edge of the battery case 1 and the spraying base 3a, ensuring the spraying effect on the surface of the battery case 1. At the same time, it can also prevent the spraying material from directly falling onto the bottom surface, increasing the subsequent cleaning difficulty. The set height difference can also prevent the spraying material from splashing and rebounding onto the surface of the battery case 1. The detachable support frame 3c can facilitate the handling of the sprayed battery case 1 and effectively prevent the non-sprayed surface of the battery case 1 from being affected by spraying.

[0037] S3. Adjust and control the surface temperature of the battery case and the spraying pressure of the spraying equipment. In this embodiment, the spraying temperature is preferably controlled between 60 - 80 °C, and the spraying pressure is controlled between 1500 - 3000 lb / in 2 ².

[0038] S4. Use the spraying equipment to spray a polyurea coating on the surface of the battery case 1.

[0039] S5. Remove the sealing plugs 2 or sealing stickers in each mounting hole 1a on the surface of the battery case 1. After the polyurea coating is cured, pack the battery case 1 and store it in the warehouse. In this embodiment, the sealing plugs 2 or sealing stickers should be removed within 3 - 5 minutes after spraying. Such a design can prevent the polyurea coating from curing and affecting the removal of the sealing plugs 2 or sealing stickers.

[0040] Through the above steps, it is ensured that the polyurea coating can be stably sprayed on the surface of the battery case 1, splashing and bubbles are avoided during the spraying process, the yield rate of spraying is ensured, and thus industrial production can be realized.

[0041] As Figure 1 shown, it also includes S6. Inspect the sprayed battery case 1 and repair the defective battery cases 1. In this embodiment, the visual inspection method is used to detect whether there are bubbles or accumulation on the surface of the battery case 1. When it is judged that there are defects or damages in the spraying on the surface of the battery case 1, the repair is carried out according to the following steps:

[0042] S6.1. Clean the polyurea coating at the damaged or defective area. In this embodiment, a grinding machine is used for grinding, and the edge of the grinding area should extend 10 - 20 mm outward from the original area edge of the damaged or defective area, and masking tape is pasted at the edge position. Such a design can ensure complete repair of the damaged or defective area and avoid secondary spraying of other positions.

[0043] S6.2. Apply an interface agent on the surface to be processed. In this embodiment, first wipe the ground area with a clean cloth block dipped in a thinner, and then form a separating layer by brushing the interface agent.

[0044] S6.3. Spray the polyurea coating on the surface to be processed. In this embodiment, wait for 2 h, and then spray the polyurea coating after the interface agent is dry.

[0045] For repair areas of different sizes, the spraying methods adopted in S6.3 are also different. In this embodiment, it can be specifically divided into the following two groups of situations:

[0046] 1. The repair area ≤ 10 cm 2 , at this time, through a simple manual portable glue gun, after squeezing out the coating, the scraping process is adopted to connect the repaired part with the surrounding polyurea as a whole.

[0047] 2. The repair area > 10 cm 2 , at this time, a simple portable cold spray polyurea equipment is used for spraying repair.

[0048] Through the repair process, the yield rate of polyurea spraying on the surface of the battery case 1 is further ensured.

[0049] Finally, it should be noted that the above description is only the preferred embodiment of the present invention. Those of ordinary skill in the art, under the inspiration of the present invention and without violating the purpose and claims of the present invention, can make various similar representations, and such transformations all fall within the protection scope of the present invention.

Claims

1. A polyurea spraying process for a battery housing, characterized in that, It includes the following steps: S1. Clean the stains on the surface of the battery case (1), and block each mounting hole (1a) of the battery case (1) by a masking process; S2. Place the battery case (1) on the profiling fixture (3); S3. Adjust and control the surface temperature of the battery case (1) and the spraying pressure of the spraying equipment; S4. Spray the surface of the battery case (1) by using the spraying equipment; S5. Remove the masking materials from each mounting hole (1a) on the surface of the battery case (1), and after the polyurea coating is cured, pack the battery case (1) and store it in the warehouse.

2. The polyurea spraying process for the battery housing according to claim 1, characterized in that: It also includes S6. Inspect the sprayed battery case (1), and repair the defective battery cases (1).

3. The polyurea spraying process for the battery housing according to claim 1, wherein: The masking process described in S1 is to block the mounting holes by using the sealing plugs (2) or sealing stickers.

4. The polyurea spraying process for the battery housing according to claim 2, characterized in that: The repair process specifically includes the following steps: S6.

1. Clean the polyurea coating at the damaged part; S6.

2. Apply an interface agent to the surface to be processed; S6.

3. Spray a polyurea coating on the surface to be processed.

5. The polyurea spraying process for the battery housing according to claim 4, wherein: The S6.1 is performed by grinding with a grinding machine.

6. The polyurea spraying process for the battery housing according to claim 1, wherein: The profiling fixture (3) includes a spraying base (3a), a support table (3b) is provided in the middle of the spraying base (3a), a support frame (3c) which is detachably installed is provided on the top of the support table (3b), and the support frame (3c) is adapted to the bottom of the battery case (1).

7. The polyurea spraying process for the battery housing according to claim 6, wherein: The area of the top of the support frame (3c) is smaller than the area of the top of the spraying base (3a).

8. The polyurea spraying process for the battery housing according to claim 1, wherein: The S5 is completed within 3 - 5 minutes after spraying.

9. The polyurea spraying process for the battery housing according to claim 3, wherein: The sealing plug (2) includes a blocking part (2a) and a supporting part (2b), the blocking part (2a) is used for blocking the mounting hole (1a), the supporting part (2b) is used for supporting on the surface of the battery case (1), the sealing plug (2) also includes a grasping part (2c) and a masking part (2d), the grasping part (2c) is vertically provided on the top of the supporting part (2b), and the masking part (2d) is provided at the upper end of the supporting part (2b) and extends circumferentially.

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