Liquid-proof rubber plug

Abstract

The utility model discloses a kind of anti-overflow liquid rubber plugs, including base and interstice cover plate, the interstice cover plate has first bottom plate, first liquid-permeable hole is opened in the first bottom plate, the first bottom plate is provided with the baffle that can be plugged to first liquid-permeable hole, the base has the connecting portion for extending into battery interior, the upper end surface of the connecting portion is second bottom plate, the outer edge of the second bottom plate is provided with outer baffle ring, the space of interstice cover plate is formed between the outer baffle ring and second bottom plate, liquid suction part is arranged between the interstice cover plate and base;The utility model has the beneficial effect that: can absorb overflowed electrolyte, prevent its corrosion battery shell;By liquid suction part, overflowed electrolyte is stored, the weight of overflowed electrolyte can be obtained after weighing, and then accurate quantitative liquid supplement is carried out.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to an anti-overflow rubber stopper. Background Technology

[0002] In the production of cylindrical batteries, the amount of electrolyte added directly affects the battery's cycle life. Therefore, the amount of electrolyte added is crucial in the battery design process. The battery electrolyte filling process involves installing an electrolyte filling plug on the filling hole of the battery. The plug has a high degree of fit with the filling equipment, avoiding gaps caused by direct contact between the filling hole and the equipment, which could lead to leakage. The equipment then performs electrolyte filling after the filling plug is installed.

[0003] In battery manufacturing, due to the limited internal space and the varying electrolyte absorption efficiencies of different positive and negative electrode materials, electrolyte injection is often performed in one or two stages. Lithium battery engineers allocate the total electrolyte volume across the primary and secondary injection processes in different proportions. However, in actual manufacturing, continuous breakthroughs in battery energy density and cycle life have made electrolyte injection extremely difficult. During injection, electrolyte is highly prone to overflowing from the battery, especially during the formation stage, where the battery experiences a temperature rise, leading to significant electrolyte spillage.

[0004] Overflowing electrolyte will remain around the filling hole. First, the overflowing electrolyte will cause corrosion of the battery casing, resulting in poor appearance. Second, when welding the filling hole sealing pins to the corroded battery, the poor end-face corrosion and poor fit with the sealing pins will easily lead to weld defects such as pin bursts. At the same time, the overflowing electrolyte directly reduces the total electrolyte volume of the battery, seriously affecting battery performance. To compensate for the lack of electrolyte, on-site operation can only use the differential weight method to replenish electrolyte. However, the differential weight method has several drawbacks. First, it weighs the battery, but the battery is much heavier than the electrolyte (and its weight fluctuates greatly), leading to insufficient accuracy in the calculated replenishment and poor consistency in the total electrolyte volume. Second, after the formation process, some electrolyte is consumed by the internal electrochemical reaction of the battery, making the differential weight method unsuitable. Only the amount of electrolyte missing can be estimated. When replenishing the electrolyte after estimation, the accuracy is insufficient, and the total electrolyte volume of the battery still cannot be guaranteed. It may even be estimated incorrectly, causing secondary overflow.

[0005] For example, the patent application number "CN202410261876.5" discloses a "battery liquid injection device and battery liquid injection method". Although the liquid storage component increases the amount of electrolyte injected in one injection process, the structure of the device is too complicated and is not suitable for the actual situation of the applicant's workshop. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-overflow rubber stopper that can not only absorb the overflowing electrolyte and prevent it from corroding the battery casing, but also store and absorb the overflowing electrolyte, weigh it, and replenish the electrolyte inside the battery accordingly based on its weight.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An anti-overflow rubber stopper includes a base and a pore cover plate. The pore cover plate has a first bottom plate with a first leakage hole. A baffle plate is provided on the first bottom plate to seal the first leakage hole. The base has a connecting part for extending into the battery. The upper end surface of the connecting part is a second bottom plate. An outer retaining ring is provided on the outer edge of the second bottom plate. A space for accommodating the pore cover plate is formed between the outer retaining ring and the second bottom plate. A liquid absorption part is provided between the pore cover plate and the base. The first base plate is also provided with a first injection hole, and the inside of the connecting part is provided with a second injection hole that communicates with the first injection hole. The first injection hole and the second injection hole are provided with pins to prevent leakage.

[0008] Preferably, an inner retaining ring is also provided on the inner side of the outer retaining ring, and the pore cover plate is located between the inner retaining ring and the second base plate.

[0009] Preferably, the inner retaining ring is provided with a second seepage hole, and the baffle includes a first baffle that can block the first seepage hole and a second baffle that can block the second seepage hole. The first baffle and the second baffle are integrally formed, and the baffles simultaneously block the first seepage hole and the second seepage hole.

[0010] Preferably, the first seepage hole is evenly distributed in three places on the first base plate, the second seepage hole is evenly distributed in three places on the inner retaining ring, and the baffle is evenly distributed in three places on the first base plate.

[0011] Preferably, the baffle is provided with a rotating handle that drives it to rotate.

[0012] Preferably, the liquid-absorbing part is L-shaped and includes an integrally formed first liquid-absorbing part and a second liquid-absorbing part. The first liquid-absorbing part is located between the outer retaining ring and the inner retaining ring, and the second liquid-absorbing part is located between the first base plate and the second base plate.

[0013] Preferably, the liquid-absorbing part is a sponge, cotton, or toilet paper.

[0014] The beneficial effects of this utility model are as follows: 1. It can absorb the overflowing electrolyte to prevent it from corroding the battery casing; the overflowing electrolyte is stored through the liquid absorption part, and the weight of the overflowing electrolyte can be obtained by weighing, so as to make accurate quantitative replenishment.

[0015] 2. The first and second seepage holes allow the electrolyte to overflow smoothly; the absorbent part absorbs the overflowing electrolyte and prevents it from evaporating, thus improving the accuracy of weighing.

[0016] 3. The baffle can be easily rotated by turning the handle to block or block the leakage hole according to different process requirements, thus meeting production needs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the device; Figure 2 This is a top view of the device; Figure 3 for Figure 2 Sectional view A-A; Figure 4 This is a schematic diagram of the structure of the pore cover plate; Figure 5 This is a schematic diagram of the base structure; Figure 6 This is a structural diagram of the base from another angle.

[0018] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings. Example

[0020] like Figure 1 and Figure 4 As shown, an anti-overflow rubber stopper of this embodiment includes a base 2 and a perforated cover plate 1. The perforated cover plate 1 has a first base plate 11, on which a first leakage hole 14 is formed. A baffle is provided on the first base plate 11 to seal the first leakage hole 14. In this embodiment, three first leakage holes 14 are evenly distributed on the first base plate 11, and three baffles are also evenly distributed on the first base plate 11. Figure 4 The state shown indicates that the baffle is not blocking the first seepage hole 14. From this position, rotating the baffle 60° clockwise (or counterclockwise) will block the first seepage hole 14.

[0021] like Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the base 2 has a connecting part 20 for extending into the battery (not shown in the figure). The upper end surface of the connecting part 20 is a second base plate 21. An outer retaining ring 23 is provided on the outer edge of the second base plate 21. A space for accommodating the pore cover plate 1 is formed between the outer retaining ring 23 and the second base plate 21. A liquid absorption part 26 is provided between the pore cover plate 1 and the base 2.

[0022] The first base plate 11 is also provided with a first injection hole 15, and the connecting part 20 is provided with a second injection hole 25 that communicates with the first injection hole 15. The first injection hole 15 and the second injection hole 25 are provided with a pin 3 to prevent leakage.

[0023] During assembly, first place the liquid absorption part 26 on the base 2, then place the hole cover plate 1 on the liquid absorption part 26, and then insert the pin 3 into the first liquid injection hole 15 and the second liquid injection hole 25 in sequence.

[0024] An inner retaining ring 22 is also provided inside the outer retaining ring 23, and the orifice cover plate 1 is located between the inner retaining ring 22 and the second base plate 21. Figure 3 As shown, the inner wall of the inner retaining ring 22 is also provided with a step for accommodating the baffle in the accommodating hole cover plate 1, so that the baffle can rotate freely within the inner retaining ring 22.

[0025] A second seepage hole 24 is provided on the inner baffle ring 22. In this embodiment, three second seepage holes 24 are evenly distributed on the inner baffle ring 22, corresponding one-to-one with the baffle. The baffle includes a first baffle 12 that can block the first seepage hole 14 and a second baffle 13 that can block the second seepage hole 24. The first baffle 12 and the second baffle 13 are integrally formed. Figure 1 In the indicated state, the first baffle 12 is not blocking the first seepage hole 14, and the second baffle 13 is not blocking the second seepage hole 24. Based on this position, rotating the baffles clockwise (or counterclockwise) by 60° will block the first seepage hole 14 with the first baffle 12 and the second seepage hole 24 with the second baffle 13.

[0026] To facilitate the rotation of the baffles, a rotating handle 16 is provided on the baffles. By rotating the handle 16, the three baffles can be rotated synchronously.

[0027] like Figure 3 As shown, the liquid absorption part 26 is L-shaped and includes an integrally formed first liquid absorption part and a second liquid absorption part. The first liquid absorption part is located between the outer retaining ring 23 and the inner retaining ring 22, and the second liquid absorption part is located between the first base plate 11 and the second base plate 21.

[0028] The liquid absorption section 26 can be made of sponge, cotton or toilet paper, which can absorb any electrolyte spillage.

[0029] In use, the device is first assembled with the base 2 and the perforation cover 1, and both are weighed and their weight recorded. Then, the two are installed into the battery, and electrolyte is injected through the first injection hole 15 and the second injection hole 25. Afterwards, the pin 3 is inserted to seal and allow the device to stand for the battery electrodes to absorb the electrolyte (based on production experience, leakage is generally not required during this process; therefore, the sealing of the first seepage hole 14 by the first baffle 12 and the second seepage hole 24 by the second baffle 13 are not required). After the standing time, the subsequent formation process is performed (based on production experience, leakage generally occurs during this process). The baffles must be rotated so that the first baffle 12 does not block the first seepage hole 14, and the second baffle 13 does not block the second seepage hole 24. Then, the pin 3 is removed. If electrolyte overflows due to poor wetting, the electrolyte will be absorbed by the absorption part 26 through the first seepage hole 14 and the second seepage hole 24, preventing electrolyte overflow and corrosion of the battery casing.

[0030] After formation, the appearance of the rubber stopper can be used to visually determine whether there is any leakage. If leakage is present, the pore cover plate can be rotated 60 degrees using the upright rod on the cover plate to seal the pore permeation area and prevent electrolyte evaporation (rotate the baffle again so that the first baffle 12 blocks the first leakage hole 14 and the second baffle 13 blocks the second leakage hole 24). The rubber stopper is then weighed and compared with the previously weighed weight. The difference method can be used to obtain the weight of electrolyte absorbed by the rubber stopper. This weight is the weight of electrolyte that has overflowed from the battery. Subsequent quantitative electrolyte replenishment can be performed based on the obtained overflow amount.

[0031] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0033] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An anti-overflow rubber stopper, comprising a base and a perforated cover plate, characterized in that, The pore cover plate has a first base plate, on which a first leakage hole is formed. A baffle plate is provided on the first base plate to seal the first leakage hole. The base has a connecting part for extending into the battery. The upper end surface of the connecting part is a second base plate. An outer retaining ring is provided on the outer edge of the second base plate. A space for accommodating the pore cover plate is formed between the outer retaining ring and the second base plate. A liquid absorption part is provided between the pore cover plate and the base. The first base plate is also provided with a first injection hole, and the inside of the connecting part is provided with a second injection hole that communicates with the first injection hole. The first injection hole and the second injection hole are provided with pins to prevent leakage.

2. The anti-overflow rubber stopper according to claim 1, characterized in that, An inner retaining ring is also provided on the inner side of the outer retaining ring, and the pore cover plate is located between the inner retaining ring and the second base plate.

3. The anti-overflow rubber stopper according to claim 2, characterized in that, The inner retaining ring is provided with a second seepage hole. The baffle includes a first baffle that can block the first seepage hole and a second baffle that can block the second seepage hole. The first baffle and the second baffle are integrally formed. The baffles simultaneously block the first seepage hole and the second seepage hole.

4. The anti-overflow rubber stopper according to claim 3, characterized in that, The first seepage hole is evenly distributed in three places on the first base plate, the second seepage hole is evenly distributed in three places on the inner retaining ring, and the baffle is evenly distributed in three places on the first base plate.

5. The anti-overflow rubber stopper according to claim 1, characterized in that, The baffle is equipped with a rotating handle that drives it to rotate.

6. The anti-overflow rubber stopper according to claim 2, characterized in that, The liquid absorption part is L-shaped and includes an integrally formed first liquid absorption part and a second liquid absorption part. The first liquid absorption part is located between the outer retaining ring and the inner retaining ring, and the second liquid absorption part is located between the first base plate and the second base plate.

7. The anti-overflow rubber stopper according to claim 6, characterized in that, The absorbent part is a sponge, cotton, or toilet paper.

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