Liquid injection hole anti-overflow device and battery cover

Abstract

The utility model belongs to the field of batteries, and particularly relates to a liquid injection hole anti-overflow device and a battery cover. The liquid injection hole anti-overflow device comprises a spiral sleeve and a plurality of guide linings connected with the inner wall of the sleeve. The sleeve is provided with a liquid injection inlet and a liquid injection outlet; and a downstream channel of the electrolyte and a countercurrent vortex of the electrolyte are formed between the guide linings. According to the anti-overflow device for the liquid injection hole, liquid injection can be smoothly carried out in the forward direction, reverse flow of electrolyte can be prevented by utilizing the vortex principle in the reverse direction, and meanwhile, gas exchange in the battery in the liquid injection and formation process cannot be influenced. The device can effectively prevent the electrolyte from overflowing due to reverse flow of the electrolyte, so that the problem of overflowing in the production and manufacturing process of the battery wire body is fundamentally solved.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to an anti-overflow device for a liquid injection hole and a battery cover. Background Art

[0002] With the rapid development of the new energy industry, aluminum shell power batteries have been widely used in vehicles, ships, and energy storage fields. As the core component of vehicle and ship power and energy storage products, the performance, life, and safety of aluminum shell power batteries directly determine the competitiveness of products in the market. In the production and manufacturing of aluminum shell batteries, "liquid overflow" is an unavoidable problem for today's lithium battery enterprises. The lack of liquid inside the battery caused by "liquid overflow" will affect the cycle life of the battery, and in severe cases of liquid overflow, the lack of liquid in the battery will cause lithium plating and dead zones, seriously endangering the charge and discharge performance and safety of the battery. There are mainly the following two reasons for the "liquid overflow" of the battery: (1) The designed liquid injection volume of the battery is too high, and there is still a lot of floating liquid inside the battery after the electrode plates are fully wetted; (2) The liquid absorption performance of the electrode plates is poor, and they cannot be fully wetted within the specified process time, resulting in a large amount of floating liquid. During the process of aluminum shell batteries, a large amount of floating liquid inside the battery will cause liquid overflow during the processes of liquid injection, formation, and helium filling and pin insertion. At present, the problem of liquid overflow is usually solved by adjusting the distribution ratio of the primary liquid injection volume and the secondary liquid injection volume and reducing the liquid injection volume of the battery, but it cannot meet the current demand for high liquid injection volume of lithium batteries.

[0003] Currently, the liquid injection holes of the battery covers used by lithium battery enterprises are all straight-through type. When the amount of floating liquid inside the battery is too large, it is very easy to occur liquid overflow, resulting in the overflowing electrolyte adhering to the battery shell, cover plate, pole column, and the workstations of liquid injection, formation, and pin insertion equipment, corroding the aluminum shell of the battery and affecting the appearance and safety performance of the product. Two points need to be particularly noted: (1) If liquid overflow occurs during the pin insertion process, it may cause the actual liquid injection volume of the battery to be less than the theoretically designed liquid injection volume, affecting the consistency of the battery; (2) During the formation process, the floating liquid may be pumped out under the action of negative pressure in the battery, which may cause a lack of liquid inside the battery, resulting in lithium plating and dead zones.

[0004] Therefore, there is an urgent need to develop a device for preventing liquid overflow from the liquid injection hole of the battery, which can effectively prevent the electrolyte inside the battery from overflowing from the liquid injection hole when there is a large amount of floating liquid. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide an anti-overflow device for a liquid injection hole and a battery cover.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid injection hole anti-overflow device includes a spiral sleeve and a plurality of guiding linings connected to the inner wall of the sleeve; the sleeve is provided with a liquid injection inlet and a liquid injection outlet; a downstream channel for the electrolyte is formed between the guiding linings and a countercurrent vortex of the electrolyte is formed.

[0008] There are two groups of the guiding linings, which are respectively connected to the inner side inner wall and the outer side inner wall of the sleeve.

[0009] The guiding linings connected to the inner side inner wall of the sleeve and the guiding linings connected to the outer side inner wall of the sleeve are arranged at intervals.

[0010] The guiding linings are arc-shaped; the tangent angle at the intersection point of the guiding linings and the inner wall is 15° to 60°.

[0011] The distance from the non-intersecting end of the guiding lining to the inner side inner wall is greater than the distance to the outer side inner wall.

[0012] The upper and lower sides of the guiding lining are respectively connected to the upper wall and the lower wall of the sleeve.

[0013] A sealing bushing is arranged on the lower wall.

[0014] The utility model further includes a battery cover, which includes a battery cover body and a liquid injection hole arranged on the battery cover body; the liquid injection hole is communicated with the liquid injection inlet of the liquid injection hole anti-overflow device.

[0015] The upper wall of the sleeve is connected to the lower wall of the battery cover body.

[0016] A boss is arranged on the liquid injection hole extending out of the battery cover body; the boss is connected with the sleeve by interference fit.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] For the liquid injection hole anti-overflow device of the utility model, liquid injection can be smoothly carried out in the forward direction, and the reverse flow of the electrolyte can be blocked by using the eddy current principle in the reverse direction. At the same time, the gas exchange inside the battery during the liquid injection and formation processes is not affected. This device can effectively prevent the "overflow" situation caused by the reverse flow of the electrolyte and fundamentally solve the "overflow" problem in the production and manufacturing process of the battery line.

[0019] When the electrolyte enters the battery interior through the liquid injection hole, it can smoothly enter the battery interior through the action of the sleeve and the inner liner. When there is a large amount of floating liquid in the battery interior and the electrolyte is about to flow back and overflow, due to the guiding action of the inner liner, a vortex phenomenon will occur, hindering the continuous backflow of the electrolyte, thereby effectively preventing the electrolyte from overflowing during the processes of battery liquid injection, negative pressure formation, and nail insertion. Especially on the mass production line, the nail insertion machine is integrated in the secondary liquid injection machine. After the battery is secondarily injected with liquid, nail insertion will be carried out immediately, and often a large number of batteries will have overflow, affecting the product performance and polluting the equipment workstations. After using this device, the backflow phenomenon of the electrolyte will be greatly inhibited, and the electrolyte cannot overflow in large quantities in a short time, and the battery can smoothly carry out nail insertion. This utility model is of great significance for improving production efficiency, product consistency, and cell performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a top view schematic diagram of the anti-overflow device for the liquid injection hole of the present utility model;

[0021] Figure 2 FIG. is a front view and a left view of the anti-overflow device for the liquid injection hole of the present utility model;

[0022] Figure 3 FIG. is a schematic diagram of the electrolyte flow direction of the anti-overflow device for the liquid injection hole of the present utility model;

[0023] Figure 4 FIG. is a schematic diagram of the structure of the battery cover of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art of this technology to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the drawings and the best embodiments.

[0025] Figures 1 - 3 There is shown an anti-overflow device for a liquid injection hole, including a spiral sleeve 4 and a plurality of guiding inner liners 3 connected to the inner wall 7 of the sleeve; the sleeve is provided with a liquid injection inlet and a liquid injection outlet 2; a downstream channel for the electrolyte is formed between the guiding inner liners and a reverse flow vortex of the electrolyte is formed.

[0026] The guiding inner liners are in two groups, respectively connected to the inner side inner wall and the outer side inner wall of the sleeve. The guiding inner liners connected to the inner side inner wall of the sleeve and the guiding inner liners connected to the outer side inner wall of the sleeve are arranged at intervals. The guiding inner liners are arc-shaped; the tangent angle of the intersection point of the guiding inner liner and the inner wall is 15° to 60°. The distance from the non-intersecting end of the guiding inner liner to the inner side inner wall is greater than the distance to the outer side inner wall, ensuring that a vortex 15 can be formed in the anti-overflow device for the liquid injection hole when the electrolyte flows back from the liquid injection outlet 2, thereby hindering the reverse flow of the electrolyte.

[0027] The upper and lower sides of the described guiding inner lining are respectively connected to the upper wall and the lower wall of the described sleeve. A sealing bushing is provided on the lower wall. Ensure that during the electrolyte injection process, the battery can only enter the sleeve 4 from the liquid injection hole 1, pass through the liquid injection hole anti-overflow device with a spiral stroke counterclockwise, and flow into the battery interior from the liquid injection outlet 2, and no liquid leakage will occur at the connection position of the sleeve.

[0028] Figure 4 There is shown a battery cover, including a battery cover body 8 and a liquid injection hole 1 provided on the battery cover body; the liquid injection hole 1 is communicated with the liquid injection inlet 13 of the liquid injection hole anti-overflow device.

[0029] The upper wall 9 of the described sleeve is connected to the lower wall 12 of the battery cover body through the upper edge part 10, and specifically, it can be welded.

[0030] The liquid injection hole 1 extends out of the battery cover body and is provided with a boss 13; the boss is connected with the sleeve 4 by interference fit.

[0031] The liquid injection hole anti-overflow device with a spiral stroke includes a sleeve 4, which is provided with an opening as the liquid injection inlet 13 to facilitate the flow of the electrolyte. The protruding lower half part boss 13 of the liquid injection hole 1 can be interference-fitted into the sleeve 4, so that the sleeve is closely attached to the lower wall 12 of the battery cover body. The upper edge part 10 of the sleeve 4 is closely attached to the lower wall 12 of the battery cover body 8 by welding to form an integral structure; the guiding inner lining 3 and the inner wall 7 and the upper wall 9 are welded into an integral structure and are closely bonded to the lower wall 11 with a sealing bushing to form an integral structure, ensuring that during the electrolyte injection process, the battery can only enter the sleeve 4 from the liquid injection hole 1, pass through the spiral stroke counterclockwise, and flow into the battery interior from the liquid injection outlet 2, and no liquid leakage will occur at the connection position of the entire spiral liquid injection buffer device.

[0032] Overview of the operation of the liquid injection hole anti-overflow device: When not injecting liquid and during formation exhaust, the device can connect the inside and outside of the battery, and gas can flow in and out unobstructed. During normal liquid injection, the electrolyte enters the device through the liquid injection hole 1 and flows along the guiding inner lining 3 and the spiral inner wall 7 in the counterclockwise direction. In this state, the electrolyte can flow into the battery interior without obstruction.

[0033] When the liquid injection is completed and there is a lot of floating liquid in the battery, the electrolyte will flow back from the liquid injection outlet 2 to the liquid injection hole 1 in the clockwise direction. As shown in Figure 3, under the action of the guiding inner lining 3 in the spiral stroke, the flowing-back electrolyte will collide with the electrolyte moving along the guiding inner lining, forming a vortex phenomenon, which hinders the electrolyte from continuing to flow back clockwise, thereby effectively preventing the electrolyte from overflowing from the liquid injection hole 1.

[0034] In summary, for the liquid injection hole anti-overflow device of the present utility model, liquid injection can be smoothly carried out in the forward direction, and the reverse flow of the electrolyte can be hindered by using the eddy current principle. At the same time, it will not affect the gas exchange inside the battery during the liquid injection and formation processes. This device can effectively prevent the "overflow" situation caused by the reverse flow of the electrolyte and fundamentally solve the "overflow" problem in the production and manufacturing process of the battery line.

[0035] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A liquid injection hole overflow prevention device, characterized in that: It comprises a spiral sleeve and a plurality of guide liners connected to the inner wall of the sleeve; the sleeve is provided with an injection inlet and an injection outlet; a downstream channel of the electrolyte and a countercurrent vortex of the electrolyte are formed between the guide liners.

2. The liquid injection hole overflow prevention device according to claim 1, characterized in that: The guide linings are divided into two groups, which are respectively connected to the inner wall on the inner side and the outer wall on the outer side of the sleeve.

3. The liquid injection hole overflow prevention device according to claim 2, characterized in that: The guide liner connected to the inner wall of the sleeve and the guide liner connected to the outer wall of the sleeve are arranged at intervals.

4. The liquid injection hole overflow prevention device according to claim 1, characterized in that: The guide lining is arc-shaped; the tangent angle of the intersection point between the guide lining and the inner wall is 15° to 60°.

5. The liquid injection hole overflow prevention device according to claim 2, characterized in that: The distance between the non-intersecting end of the guide lining and the inner wall and the inner wall is greater than the distance from the outer wall.

6. The liquid injection hole overflow prevention device according to claim 1, characterized in that: The upper and lower sides of the guide lining are respectively connected to the upper wall and the lower wall of the sleeve.

7. The liquid injection hole overflow prevention device according to claim 6, characterized in that: A sealing bushing is arranged on the lower wall.

8. A battery cover, characterized in that: It comprises a battery cover body and a liquid injection hole arranged on the battery cover body; the liquid injection hole is connected to the liquid injection inlet of the liquid injection hole overflow prevention device according to any one of claims 1-7.

9. The battery cover according to claim 8, characterized in that: The upper wall of the sleeve is connected to the lower wall of the battery cover body.

10. The battery cover according to claim 8, characterized in that: The injection hole extends out of the battery cover body and is provided with a boss; the boss is connected with the sleeve by interference fit.

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