Cover plate structure of aluminum shell battery

Abstract

The utility model discloses a cover plate structure of an aluminum shell battery, which relates to the technical field of batteries and comprises a cover plate body, a cover plate pouring step arranged on the cover plate body and a liquid injection pipe arranged in the cover plate pouring step, a liquid injection piece capable of being adjusted up and down is arranged in the liquid injection pipe in a penetrating mode and covers the bottom of the liquid injection pipe, a reset spring is arranged in the liquid injection pipe, and the top of the reset spring is fixed to a fixing step in the liquid injection pipe. The utility model has the advantages that the liquid injection pipe is screwed on the cover plate through the threads, the rubber ring is positioned at the bottom of the liquid injection pipe and is always tensioned by the reset spring to form sealing, and the rubber ring is positioned at the bottom of the liquid injection pipe and inside the battery shell, so that the falling of the rubber nail caused by external force can be effectively improved, and the sealing performance is improved; the liquid injection part is pressed downwards, the reset spring is pulled by the liquid injection part to eject the rubber ring open, the channel is opened for liquid injection, the liquid injection part is loosened after liquid injection, the reset spring immediately resets and tensions the rubber ring, and the time for exposing liquid injection air in the air is greatly shortened through real-time sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an aluminum shell battery cover plate structure. Background Art

[0002] The square aluminum shell battery is injected with electrolyte after baking. In order to achieve the injection, a through hole needs to be reserved on the cover plate body as the injection hole. As the capacity of the aluminum shell battery continues to increase, the size becomes larger and larger, and the electrolyte infiltration restricts the efficiency of the production line. For this reason, a one-time injection + negative pressure formation + secondary / multiple injection process route is commonly adopted. The battery is transported between each process and the battery is sealed by sealing nails, and finally the final seal is achieved by laser welding the aluminum nails and the cover plate.

[0003] During the battery's process from liquid injection to nail sealing, the plastic nails are inserted into the liquid injection holes as soft connections. Due to objective factors such as mechanical collision, loose nail insertion, and plastic nail wear, the plastic nails are very easy to fall off and be damaged. After falling off, the battery absorbs moisture from the air, causing the battery to bulge and the electrochemical performance to drop. Common factors such as incomplete removal of battery baking moisture and excessive electrolyte moisture cause battery gas bulging after capacity division / cycling, affecting the battery pack assembly size. Commonly, after long-term circulation of finished batteries, or when the liquid injection volume is lower than the designed liquid injection volume, the internal electrolyte is exhausted, causing performance to drop and shortening the battery life. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an aluminum shell battery cover plate structure, which can effectively improve the falling off of glue nails caused by external force and improve the sealing performance.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] An aluminum shell battery cover plate structure, comprising a cover plate body, a cover plate casting step arranged on the cover plate body, and a liquid injection pipe arranged inside the cover plate casting step;

[0007] The injection tube is provided with an injection piece which can be adjusted up and down, and the injection piece covers the bottom of the injection tube. The injection tube is provided with a return spring, the top of the return spring is fixed on the injection tube, and the bottom of the return spring is fixedly connected to the injection piece.

[0008] Preferably, the injection part includes a fixed step, an injection needle body and a downward pressing step, and the injection part includes the fixed step, the injection needle body and the downward pressing step, which are integrally formed, and the fixed step, the injection needle body and the downward pressing step form a "stem"-shaped cylindrical structure, and the fixed step extends out of the bottom of the injection tube.

[0009] Preferably, a rubber ring is provided on the fixed step, and when the injection needle body is in an initial state, the rubber ring on the fixed step abuts against the bottom of the injection tube.

[0010] Preferably, a liquid storage cavity is formed between the liquid injection tube and the liquid injection piece, the liquid storage cavity is arranged through the liquid injection tube, and the reset spring is located in the liquid storage cavity.

[0011] Preferably, the diameter of the downward pressing step is smaller than the inner diameter of the liquid storage cavity.

[0012] Preferably, a step surface is provided on the inner wall of the injection tube, the top diameter of the return spring is larger than the diameter of other parts, and the top of the return spring is fixed on the step surface.

[0013] Preferably, the cover plate casting step is configured as a cylindrical through-hole structure, the cover plate casting step and the cover plate body are an integrated structure, threads are provided inside and outside the cover plate casting step, an external thread is provided on the outer wall of the injection tube, and the injection tube is screwed together with the thread inside the cover plate casting step through the external thread.

[0014] Preferably, it also includes a nut, which is screwed and connected to the cover plate casting step, and the nut is covered on the cover plate casting step to seal the top of the cover plate casting step.

[0015] Preferably, a sealing ring is provided at the inner corner of the nut, and when the nut is closed on the top of the cover plate casting step, the sealing ring contacts the top of the cover plate casting step.

[0016] Preferably, the outer side of the injection pipe includes a threaded portion and a truncated cone portion, the threaded portion is connected to the cover plate casting step, and the truncated cone portion is located below the cover plate body.

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

[0018] 1. The injection tube is screwed onto the cover plate through threads. The rubber ring is at the bottom of the injection tube and is always tightened by the return spring to form a seal. The rubber ring is at the bottom of the injection tube and located inside the battery housing, which can effectively prevent the rubber nail from falling off due to external force and improve the sealing performance.

[0019] 2. By pressing down the injection part, the injection part pulls the reset spring to push open the rubber ring, opening the channel for injection. After injection, release the injection part, the reset spring immediately resets and tightens the rubber ring, and the real-time sealing greatly shortens the time that the injection space is exposed to the air;

[0020] 3. When the battery is swollen due to gas production, the nut can be unscrewed and the injection piece can be pressed to open the channel to discharge the gas. When the electrolyte inside the battery is exhausted, the nut can be unscrewed and the injection piece can be pressed to replenish the electrolyte again. The overall structure can be reused without loss, and the actual application effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0022] Figure 1 This is a schematic diagram of the overall structure of the aluminum shell battery cover structure of the utility model;

[0023] Figure 2 This is a structural schematic diagram of the cover body of the utility model;

[0024] Figure 3 This is an internal cross-sectional view of the liquid injection tube of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the liquid injection tube and the nut when they are connected to each other;

[0026] Figure 5 It is a structural schematic diagram of the liquid injection part of the utility model.

[0027] Explanations in the figure: 10, cover body; 20, cover casting step; 30, injection pipe; 31, liquid storage chamber; 32, injection piece; 321, fixing step; 322, injection needle body; 323, pressing step; 33, reset spring; 34, rubber ring; 35, external thread; 40, nut. DETAILED DESCRIPTION

[0028] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.

[0029] like Figure 1-2 As shown, as an aluminum shell battery cover plate structure of the utility model, it includes a cover plate body 10, a cover plate casting step 20 arranged on the cover plate body 10, and a liquid injection pipe 30 arranged inside the cover plate casting step 20;

[0030] An injection piece 32 which can be adjusted up and down is provided in the injection tube 30, and the injection piece 32 covers the bottom of the injection tube 30. A return spring 33 is provided in the injection tube 30, and the top of the return spring 33 is fixed on the injection tube 30, and the bottom of the return spring 33 is fixedly connected to the injection piece 32. The return spring 33 is made of a high elastic spring and a material that is resistant to electrolyte corrosion, such as stainless steel.

[0031] Specifically, the cover plate casting step 20 protrudes from the cover plate body 10, and the height is optional for the matching of the injection pipe 30, so that it has a wide range of uses;

[0032] When liquid is being injected, the injection piece 32 is pressed down to extend the reset spring 33, so that the opening at the bottom of the injection tube 30 is exposed, thereby performing the injection operation; when liquid injection is not required, the injection piece 32 will seal the bottom of the injection tube 30 under the action of the reset spring 33. The injection piece 32 is made of metal material that is resistant to electrolyte corrosion, such as stainless steel.

[0033] like Figure 5 As shown, the injection piece 32 includes a fixed step 321, an injection needle body 322 and a downward pressing step 323. The injection piece 32 includes the fixed step 321, the injection needle body 322 and the downward pressing step 323, which are integrally formed. The fixed step 321, the injection needle body 322 and the downward pressing step 323 form a "stem"-shaped cylindrical structure, which can make the overall structure of the injection piece 32 stable, and the position inside the injection tube 30 is stable without offset. The fixed step 321 extends out of the bottom of the injection tube 30.

[0034] Specifically, a rubber ring 34 is provided on the fixed step 321, and the rubber ring 34 needs to be made of a soft material that is resistant to corrosion by the electrolyte. When the injection needle body 322 is in the initial state, the rubber ring 34 on the fixed step 321 contacts the bottom of the injection tube 30. When the injection needle body 322 is pressed downward, the fixed step 321 is away from the bottom end of the injection tube 30, so that the injection tube 30 is connected and the injection operation can be performed.

[0035] By setting the fixed step 321, the placement position of the rubber ring 34 can be stabilized. When sealing the bottom of the injection tube 30, the rubber ring 34 fits the bottom position of the injection tube 30 more closely, and the sealing effect of the bottom of the injection tube 30 is better.

[0036] like Figure 3 As shown, a liquid storage cavity 31 is formed between the liquid injection tube 30 and the liquid injection piece 32. The liquid storage cavity 31 runs through the liquid injection tube 30. The return spring 33 is located in the liquid storage cavity 31. When liquid injection is required, the liquid will be transported in the liquid storage cavity 31. When liquid infusion is not required, even if liquid enters the liquid storage cavity 31, it will be stored in the liquid storage cavity 31.

[0037] like Figure 3-5 As shown, the diameter of the pressing step 323 is smaller than the inner diameter of the liquid storage chamber 31, so that the pressing step 323 can be completely located inside the liquid storage chamber 31, which can facilitate the user to press the pressing step 323 and prevent the pressing step 323 from being stuck inside the liquid storage chamber 31, thereby preventing the injection channel from being closed.

[0038] like Figure 3As shown, a step surface is provided on the inner wall of the injection tube 30, and the top diameter of the return spring 33 is larger than the diameter of other parts. The top of the return spring 33 is fixed on the step surface, which can stabilize the position of the return spring 33. When the return spring 33 is extended, the top position of the return spring 33 is fixed to avoid the position shaking of the return spring 33. At the same time, when the fixed step 321 needs to be reset, the return spring 33 will promptly pull the fixed step 321 to the bottom of the injection tube 30.

[0039] like Figure 2 As shown, the cover casting step 20 is configured as a cylindrical through-hole structure, the cover casting step 20 and the cover body 10 are an integrated structure, threads are provided inside and outside the cover casting step 20, and an external thread 35 is provided on the outer wall of the injection pipe 30. The injection pipe 30 is threadedly connected to the thread inside the cover casting step 20 through the external thread 35, so that the position of the injection pipe 30 on the cover casting step 20 can be stably located, and the sealing between the injection pipe 30 and the cover casting step 20 is higher.

[0040] like Figure 4 As shown, an aluminum shell battery cover plate structure also includes a nut 40, which is screwed and connected to the cover plate casting step 20. The nut 40 is covered on the cover plate casting step 20 to seal the top of the cover plate casting step 20. Through the setting of the nut 40, the top of the injection tube 30 can be sealed. When injection is not needed, the injection tube 30 can be sealed and protected in time.

[0041] like Figure 3 As shown, a sealing ring is provided at the inner corner of the nut 40. When the nut 40 is covered on the top of the cover plate casting step 20, the sealing ring contacts the top of the cover plate casting step 20, which can further improve the sealing performance of the nut 40 and make the sealing effect of the nut 40 better.

[0042] like Figure 4 As shown, the outer side of the injection pipe 30 includes a threaded portion and a truncated cone portion. The threaded portion is connected to the cover casting step 20, and the truncated cone portion is located below the cover body 10, which is convenient for the installation and connection of the injection pipe 30 and has a better actual application effect.

[0043] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An aluminum shell battery cover plate structure, characterized in that: It comprises a cover plate body (10), a cover plate casting step (20) arranged on the cover plate body (10), and a liquid injection pipe (30) arranged inside the cover plate casting step (20); The liquid injection tube (30) is provided with a liquid injection piece (32) which can be adjusted up and down, and the liquid injection piece (32) covers the bottom of the liquid injection tube (30). The liquid injection tube (30) is provided with a return spring (33), the top of the return spring (33) is fixed on the liquid injection tube (30), and the bottom of the return spring (33) is fixedly connected to the liquid injection piece (32).

2. The aluminum shell battery cover plate structure according to claim 1, characterized in that: The injection piece (32) comprises a fixed step (321), a liquid injection needle body (322) and a downward pressing step (323); the injection piece (32) comprises the fixed step (321), the liquid injection needle body (322) and the downward pressing step (323) which are integrally formed; the fixed step (321), the liquid injection needle body (322) and the downward pressing step (323) form a "stem"-shaped cylindrical structure; the fixed step (321) extends out of the bottom of the liquid injection tube (30).

3. The aluminum shell battery cover plate structure according to claim 2, characterized in that: The fixed step (321) is provided with a rubber ring (34), and when the injection needle body (322) is in an initial state, the rubber ring (34) on the fixed step (321) abuts against the bottom of the injection tube (30).

4. The aluminum shell battery cover plate structure according to claim 3, characterized in that: A liquid storage cavity (31) is formed between the liquid injection tube (30) and the liquid injection piece (32); the liquid storage cavity (31) is arranged to penetrate the liquid injection tube (30); and the return spring (33) is located in the liquid storage cavity (31).

5. The aluminum shell battery cover plate structure according to claim 4, characterized in that: The diameter of the pressing step (323) is smaller than the inner diameter of the liquid storage cavity (31).

6. The aluminum shell battery cover plate structure according to claim 1, characterized in that: The cover plate casting step (20) is configured as a cylindrical through-hole structure. The cover plate casting step (20) and the cover plate body (10) are an integrated structure. The cover plate casting step (20) is provided with threads both inside and outside. The outer wall of the injection pipe (30) is provided with external threads (35). The injection pipe (30) is screwed together with the threads inside the cover plate casting step (20) through the external threads (35).

7. The aluminum shell battery cover plate structure according to claim 6, characterized in that: It also includes a nut (40), which is screwed and connected to the cover plate casting step (20). The nut (40) covers the cover plate casting step (20) to seal the top of the cover plate casting step (20).

8. The aluminum shell battery cover plate structure according to claim 7, characterized in that: A sealing ring is provided at the inner corner of the nut (40). When the nut (40) is covered on the top of the cover plate casting step (20), the sealing ring contacts the top of the cover plate casting step (20).

9. The aluminum shell battery cover plate structure according to claim 1, characterized in that: The outer side of the injection pipe (30) comprises a threaded portion and a truncated cone portion, the threaded portion is connected to the cover plate casting step (20), and the truncated cone portion is located below the cover plate body (10).

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