Battery liquid injection assembly and sealing cover plate thereof

Abstract

The sealing cover plate comprises a plate body and a liquid injector, the plate body comprises a top cover and a rubber mat arranged on the lower bottom face of the top cover, the top cover is provided with a liquid injection hole matched with the liquid injector, the bottom of the liquid injection hole is provided with a sealing elastic piece for the tip end of the liquid injector to penetrate through, and the sealing elastic piece is arranged on the bottom face of the top cover. The rubber mat extends in the direction away from the liquid injection hole to form a baffle, and a channel used for liquid injection is formed between the baffle and the sealing piece. When liquid injection is needed, the tip end of the liquid injection device can penetrate through the sealing elastic piece to the interior of the battery, the sealing piece is peeled off until liquid injection is finished, and due to the fact that the diameter of the tip end of the liquid injection device is very small, after the liquid injection device is peeled off the sealing elastic piece, the sealing elastic piece is sealed again due to the elasticity of the sealing elastic piece. In the whole liquid injection process, the electrolyte is basically not in contact with the outside of the battery, and the battery appearance and the yield of the sealing nail welding procedure are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection, in particular to a battery liquid injection assembly and a sealing cover plate thereof. Background Art

[0002] With the increasing development of the new energy industry, as a key component of the new energy industry, the research and development of power batteries have received more and more extensive attention; power batteries have the advantages of light weight, high capacity, long life, low self-discharge rate, no memory effect, no pollution, etc. Especially, power batteries are widely used in equipment such as electric bicycles and electric hardware tools, and the application of power batteries in these equipment has advantages. In the prior art, the battery cells are injected with liquid through the liquid injection holes on the lower plastic plate. For example, patent CN201821488710.3 discloses a plastic pad top cover for a power battery. When injecting liquid, the liquid injection port of the liquid injection device is aligned with the liquid injection hole and liquid is injected. However, since the liquid injection hole serves as a liquid injection channel, electrolyte residues are likely to accumulate near the liquid injection hole, and the compound produced by the chemical reaction between the lithium salt in the electrolyte and the aluminum alloy on the upper surface of the liquid injection hole will still cause abnormalities such as laser welding explosion points, resulting in low yield of battery cell production. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides a battery liquid injection assembly and a sealing cover plate thereof, which realize the battery liquid injection process inside the battery through a sealing elastic member, and the electrolyte is basically not in contact with the outside of the battery, which will greatly improve the appearance of the battery and the yield of the sealing nail welding process.

[0004] The technical solution adopted by the utility model is as follows: a sealing cover plate, including a top cover and a rubber pad arranged on the lower bottom surface of the top cover. The top cover is provided with a liquid injection hole for cooperating with a liquid injector. The bottom of the liquid injection hole is provided with a sealing elastic member for the tip of the liquid injector to pass through. The rubber pad extends towards a direction away from the liquid injection hole to form a baffle, and a channel for liquid injection is formed between the baffle and the sealing member.

[0005] Optionally, the liquid injection hole includes a plurality of through holes arranged in central symmetry.

[0006] Optionally, the baffle is arranged parallel to the top cover, and the channel is vertically located on both sides of the sealing member.

[0007] Optionally, the top cover is provided with a positive electrode column and a negative electrode column, and the liquid injection hole is located between the positive electrode column and the negative electrode column.

[0008] Optionally, the material of the sealing elastic member is chloroprene rubber.

[0009] The present utility model also discloses a battery liquid injection assembly, which includes a liquid injector and the sealing cover plate described above. The liquid injector includes a liquid storage part and a needle-piercing part connected to the liquid storage part. The needle-piercing part passes through the sealing elastic member and enters the channel, and a plurality of liquid outlet holes are arranged along the circumferential direction of the needle-piercing part.

[0010] Optionally, the diameter of the needle-piercing part is smaller than the diameter of the liquid storage part.

[0011] Optionally, the diameter of the liquid outlet hole is 1-3 mm.

[0012] The beneficial effects of the present utility model are as follows: When liquid injection is required, the tip of the liquid injector can be used to pierce through the sealing elastic member into the battery until the liquid injection is completed and then the sealing member is peeled off. Since the diameter of the tip of the liquid injector is very small, after the liquid injector peels off the sealing elastic member, the sealing elastic member forms a seal again under its own elastic force. The baffle prevents the tip of the liquid injector from piercing the internal electrode core, realizing that the battery liquid injection process is completed inside the battery. During the entire liquid injection process, the electrolyte is basically not in contact with the outside of the battery, which will greatly improve the yield of the battery appearance and the sealing nail welding process, and also reduce the environmental requirements accordingly, resulting in a significant reduction in the battery manufacturing cost. The sealing elastic member is fixedly connected to the bottom of the liquid injection hole by mechanical pressing. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the battery liquid injection assembly proposed by the embodiment of the present utility model;

[0014] Figure 2 It is a cross-sectional view of the cooperation between the liquid injector and the sealing elastic member of the battery liquid injection assembly proposed by the embodiment of the present utility model;

[0015] Figure 3 It is a schematic diagram of the liquid injection hole proposed by the embodiment of the present utility model;

[0016] Figure 4 It is a schematic diagram of the liquid injector proposed by the embodiment of the present utility model.

[0017] The marks in each drawing are: 1. Top cover; 11. Liquid injection hole; 111. Through hole; 12. Positive electrode post; 13. Negative electrode post; 2. Rubber pad; 21. Baffle; 22. Channel; 3. Liquid injector; 31. Liquid storage part; 32. Needle-piercing part; 33. Liquid outlet hole; 4. Sealing elastic member. Detailed Embodiments

[0018] The following will describe the present utility model in detail with reference to each drawing.

[0019] As Figure 1 and 2As shown in the figure, this embodiment discloses a battery liquid injection assembly, including a sealing cover plate and a liquid injector 3. The sealing cover plate includes a top cover 1 and a rubber pad 2 provided on the lower bottom surface of the top cover 1. The top cover 1 is provided with a liquid injection hole 11 that cooperates with the liquid injector 3. At the bottom of the liquid injection hole 11, there is a sealing elastic member 4 through which the tip of the liquid injector 3 can pass. The rubber pad 2 extends in a direction away from the liquid injection hole 11 to form a baffle 21, and a channel 22 for liquid injection is formed between the baffle 21 and the sealing member. When liquid injection is required, the tip of the liquid injector 3 can pierce through the sealing elastic member 4 into the battery interior until the liquid injection is completed and then the sealing member is peeled off. Since the diameter of the tip of the liquid injector 3 is very small, after the liquid injector 3 peels off the sealing elastic member 4, the sealing elastic member 4 forms a seal again under its own elastic force. The baffle 21 prevents the tip of the liquid injector 3 from piercing the internal electrode core, realizing that the battery liquid injection process is completed inside the battery. During the entire liquid injection process, the electrolyte is basically not in contact with the outside of the battery, which will greatly improve the yield of the battery appearance and the sealing nail welding process, and also reduce the environmental requirements accordingly, resulting in a significant reduction in the battery manufacturing cost. The sealing elastic member 4 is fixedly connected to the bottom of the liquid injection hole 11 by mechanical pressing.

[0020] In this embodiment, as Figure 3 shown, the liquid injection hole 11 includes a plurality of through holes 111 that are symmetrically arranged around the center. The functions of each through hole 111 are different. In this embodiment, there are a total of five through holes 111. As shown in the figure, the 4 outer through holes 111 are respectively used for the first helium leak detection, the first liquid injection, the negative pressure formation, and the second liquid injection, and the 1 middle through hole 111 is used for mechanical positioning and standby.

[0021] In this embodiment, as Figure 2 shown, the baffle 21 is arranged parallel to the top cover 1, and the channel 22 is vertically located on both sides of the sealing member. The electrolyte is injected into the battery interior in a horizontal direction, avoiding damaging the electrode core structure due to the vertical injection of the electrolyte.

[0022] In this embodiment, as Figure 1 and 2 shown, the top cover 1 is provided with a positive electrode post 12 and a negative electrode post 13, and the liquid injection hole 11 is located between the positive electrode post 12 and the negative electrode post 13. The material of the sealing elastic member 4 is chloroprene rubber. Chloroprene rubber can effectively prevent the corrosion of the electrolyte solution.

[0023] In this embodiment, as Figure 2 and 4As shown in the figure, the injector 3 includes a liquid storage part 31 and a needle puncture part 32 connected to the liquid storage part 31. The needle puncture part 32 is provided with a plurality of liquid outlet holes 33 along the circumferential direction. The diameter of the needle puncture part 32 is smaller than the diameter of the liquid storage part 31. The diameter of the liquid outlet holes 33 is 1-3 mm. There can be 3-4 rows of liquid outlet holes 33, and each row has 3-4 liquid outlet holes 33. If the diameter of the liquid outlet holes 33 is too large, it will increase the impact of the electrolyte on the electrode core. If the liquid outlet holes 33 are too small, it will affect the liquid outlet efficiency.

[0024] The above are only the preferred embodiments of the present invention, and thus do not limit the patent protection scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, shall be equally included in the protection scope of the present invention.

Claims

1. A sealing cover plate, characterized in that: It includes a top cover and a rubber pad arranged on the lower surface of the top cover, the top cover is provided with an injection hole for cooperating with an injector, a sealing elastic member is provided at the bottom of the injection hole for the tip of the injector to pass through, the rubber pad extends in a direction away from the injection hole to form a baffle, and a channel for injection is formed between the baffle and the sealing member.

2. The sealing cover plate according to claim 1, characterized in that: The liquid injection hole includes a plurality of through holes which are centrally symmetrically arranged.

3. The sealing cover plate according to claim 1, characterized in that: The baffle is arranged in parallel with the top cover, and the channels are vertically located on both sides of the sealing member.

4. The sealing cover plate according to claim 1, characterized in that: The top cover is provided with a positive pole column and a negative pole column, and the injection hole is located between the positive pole column and the negative pole column.

5. The sealing cover plate according to claim 1, characterized in that: The sealing elastic member is made of chloroprene rubber.

6. A battery liquid injection assembly, characterized in that: It comprises an injector and a sealing cover plate according to any one of claims 1 to 5, wherein the injector comprises a liquid storage portion and a puncture portion connected to the liquid storage portion, the puncture portion passes through the sealing elastic member into the channel, and the puncture portion is provided with a plurality of liquid outlet holes along the circumferential direction.

7. The battery liquid injection assembly according to claim 6, characterized in that: The diameter of the puncture portion is smaller than the diameter of the liquid storage portion.

8. The battery liquid injection assembly according to claim 6, characterized in that: The diameter of the liquid outlet hole is 1 to 3 mm.

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