Cover plate for long-circulation lithium battery and battery

Abstract

The utility model belongs to the technical field of battery use, and particularly relates to a cover plate for a long-circulation lithium battery and a battery, the cover plate covers a battery body, the cover plate and the battery together enclose to form a containing cavity for sealing electrolyte, the cover plate is characterized by comprising a cover plate body, and a positive terminal and a negative terminal are respectively arranged on two sides of the cover plate body; a one-way liquid supplementing assembly is arranged on the cover plate body, a one-way flow channel is arranged in the one-way liquid supplementing assembly, the flowing direction is from outside to inside of the containing cavity, the inlet end of the one-way flow channel is sealed through a liquid supplementing cover, the outlet end of the one-way flow channel is introduced into the battery body, and electrolyte is injected into the containing cavity from the outside of the cover plate body through the one-way flow channel; a first valve is arranged on the cover plate body, a second valve is further arranged on the cover plate body, the one-way liquid supplementing assembly is arranged on the cover plate body, the one-way flow channel is arranged in the one-way liquid supplementing assembly, and the flow direction is from outside to inside of the containing cavity. And the inlet end of the one-way flow channel is sealed through the liquid supplementing cover, and the liquid supplementing cover performs sealing work after electrolyte is supplemented, so that the double-guarantee effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery use, and particularly relates to a cover plate and a battery for a long-cycle lithium battery. Background Technique

[0002] A lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in its electrochemical system.

[0003] With the continuous deepening of the application of lithium batteries in multiple fields such as power, energy storage, and household electricity storage, the industry's demand for the cycle life and safety performance of lithium batteries is constantly increasing. One of the major factors affecting the battery cycle life is that the electrolyte continuously decomposes until it dries up after the battery undergoes charge and discharge cycles, seriously affecting the battery's cycling ability.

[0004] In addition, the gas generated by the decomposition of the electrolyte will also cause the battery to bulge, resulting in gaps between the positive and negative electrode plates and the separator, leading to purple spots or black plates and even lithium plating, greatly increasing the usage risk of the battery while reducing the battery capacity.

[0005] Practical Content

[0006] To address the above problems, this utility model proposes a cover plate for a long-cycle lithium battery, which is covered on the battery body and jointly encloses a cavity for sealing the electrolyte. It is characterized in that it includes a cover plate body, and a positive terminal and a negative terminal are respectively arranged on both sides of the cover plate body;

[0007] A one-way liquid supplementing component is arranged on the cover plate body. A one-way flow channel is arranged in the one-way liquid supplementing component, and the flow direction is from the outside to the inside of the cavity. The inlet end of the one-way flow channel is sealed by a liquid supplementing cap, and the outlet end of the one-way flow channel leads into the battery body. The electrolyte is injected into the cavity from outside the cover plate body through the one-way flow channel to perform the electrolyte supplement operation;

[0008] A second valve is also arranged on the cover plate body for releasing the gas generated by the decomposition of the electrolyte.

[0009] Preferably, the one-way liquid supplementing component includes a liquid supplementing hole and a one-way valve. The liquid supplementing hole penetrates through the surface of the cover plate body, and a one-way valve is installed in the liquid supplementing hole. The valve channel of the one-way valve is the one-way flow channel.

[0010] Preferably, the one-way valve is a granular material valve.

[0011] Preferably, a sealing ring is arranged between the liquid supplementing hole, the one-way valve and the liquid supplementing cap for sealing between the one-way liquid supplementing component and the cover plate body.

[0012] Preferably, the sealing ring has a double-layer sealing ring structure, with the side closer to the cavity being the inner layer. Among them, the outer sealing ring layer is in the shape of a rubber ring and is arranged between the one-way valve and the liquid supplementing hole;

[0013] The sealing ring layer located in the inner layer is in the shape of a rubber pad and is arranged between the one-way valve, the liquid replenishing hole and the liquid replenishing cover.

[0014] Preferably, the cover body is further provided with a liquid injection hole for injecting electrolyte into the battery body.

[0015] Preferably, the second valve is an explosion-proof valve.

[0016] Preferably, the liquid replenishing cover is an aluminum cover.

[0017] Preferably, the aluminum cover is provided with a movable aluminum buckle for manually opening and fastening the aluminum cover.

[0018] This application also claims to protect a battery using the above cover. It is characterized in that it includes a battery body, and a cavity for accommodating electrolyte in the battery body is sealed by the cover.

[0019] Beneficial effects

[0020] 1. In the present utility model, by arranging a one-way liquid replenishing assembly on the cover body, and a one-way flow channel is provided in the one-way liquid replenishing assembly, and the flow direction is from outside to the cavity, so the electrolyte is injected into the cavity from outside the cover body through the one-way flow channel to perform the electrolyte replenishing operation;

[0021] Furthermore, the inlet end of the one-way flow channel is sealed by the liquid replenishing cover, which means that in addition to the sealing effect achieved by the one-way flow of the one-way flow channel itself, the sealing work after the electrolyte is replenished by the liquid replenishing cover provides a double guarantee effect;

[0022] Furthermore, a second valve is also arranged. As is well known, during the working process of the electrolyte, the gas generated by the decomposition of the electrolyte will also cause the battery to bulge. The second valve releases the gas decomposed from the electrolyte, increasing the overall safety.

[0023] 2. Moreover, this application also combines the above double guarantee effect. Considerately, the sealing ring is set as a double-layer sealing ring structure. More specifically, in combination with the actual working conditions, the outer sealing ring layer is in the shape of a rubber ring and is arranged between the one-way valve and the liquid replenishing hole; the inner sealing ring layer is in the shape of a rubber pad and is arranged between the one-way valve, the liquid replenishing hole and the liquid replenishing cover. It can be said that the sealing effect of the entire one-way liquid replenishing assembly is better.

[0024] Other features and advantages of the present utility model will be described in the following description of the specification, and some of them will become obvious from the description of the specification, or can be understood by implementing the present utility model. The purpose and other advantages of the present utility model can be achieved and obtained through the structure pointed out in the specification and the drawings. Brief description of the drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Shows a schematic cross-sectional view of the side of the cover plate in the embodiment of the present utility model;

[0027] Figure 2 Shows a bottom view of the cover plate in the embodiment of the present utility model;

[0028] Figure 3 Shows Figure 1 Partial enlarged view of

[0029] In the figure,

[0030] 1. Cover plate body; 11. Negative terminal; 12. Positive terminal; 13. Liquid injection hole;

[0031] 2. Liquid replenishment assembly; 20. Liquid replenishment cover; 21. Liquid replenishment hole; 22. Check valve; 23. Sealing ring;

[0032] 3. Second valve. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0034] Refer to Figure 1 and Figure 2 , Figure 1 Shows a schematic cross-sectional view of the side of the cover plate in the embodiment of the present utility model; Figure 2 Shows a bottom view of the cover plate in the embodiment of the present utility model; Figure 1 It can be clearly seen that a cover plate for a long-cycle lithium battery is covered on the battery body, jointly enclosing a cavity for sealing the electrolyte, including a cover plate body 1. The positive terminal 12 and the negative terminal 11 are respectively arranged on both sides of the cover plate body 1. The cover plate body 1 is also provided with a liquid injection hole for injecting electrolyte into the battery body;

[0035] A one-way liquid replenishing component 2 is arranged on the cover plate body 1. A one-way flow channel is provided inside the one-way liquid replenishing component 2, and the flow direction is from the outside to the cavity. The inlet end of the one-way flow channel is sealed by a liquid replenishing cover 20, and the outlet end of the one-way flow channel leads into the battery body. The electrolyte is injected into the cavity from outside the cover plate body 1 through the one-way flow channel to perform the electrolyte replenishing operation;

[0036] A second valve 3 is also arranged on the cover plate body 1, which is used to release the decomposed gas of the electrolyte. The second valve 3 is an explosion-proof valve.

[0037] In the utility model, a one-way liquid replenishing component 2 is arranged on the cover plate body 1, and a one-way flow channel is provided inside the one-way liquid replenishing component 2, and the flow direction is from the outside to the cavity. Therefore, the electrolyte is injected into the cavity from outside the cover plate body 1 through the one-way flow channel to perform the electrolyte replenishing operation;

[0038] Furthermore, the inlet end of the one-way flow channel is sealed by the liquid replenishing cover 20, which means that in addition to the one-way circulation of the one-way flow channel itself to achieve the sealing effect, the liquid replenishing cover 20 plays a dual guarantee effect on the sealing work after the electrolyte is replenished;

[0039] Furthermore, a second valve 3 is also arranged. As is well known, during the working process of the electrolyte, the decomposed gas generated will also cause the battery to bulge. By releasing the decomposed gas of the electrolyte through the second valve 3, the overall safety is increased.

[0040] Reference Figure 3 , Figure 3 shows Figure 1 a partial enlarged view of; it can be clearly seen from this schematic diagram that the one-way liquid replenishing component 2 includes a liquid replenishing hole 21 and a one-way valve 22. The liquid replenishing hole 21 penetrates through the surface of the cover plate body 1, and a one-way valve 22 is installed in the liquid replenishing hole 21. The valve channel of the one-way valve 22 is a one-way flow channel. The one-way valve 22 is a granular material valve.

[0041] Moreover, this application also combines the above-mentioned dual guarantee effect, and thoughtfully sets the sealing ring as a double-layer sealing ring structure. Furthermore, in combination with the actual working conditions, the outer sealing ring layer is in the shape of a rubber ring and is arranged between the one-way valve 22 and the liquid replenishing hole 21; the inner sealing ring layer is in the shape of a rubber pad and is arranged between the one-way valve 22, the liquid replenishing hole 21 and the liquid replenishing cover 20. It can be said that the sealing effect of the entire one-way liquid replenishing component 2 is better.

[0042] A sealing ring 23 is arranged between the liquid replenishing hole 21, the one-way valve 22 and the liquid replenishing cover 20, which is used for sealing between the one-way liquid replenishing component 2 and the cover plate body 1. The liquid replenishing cover 20 is an aluminum cover, and a movable aluminum buckle is arranged on the aluminum cover for manually opening and fastening the aluminum cover. The sealing ring is a double-layer sealing ring structure, with the direction towards the cavity being the inside. Among them, the outer sealing ring layer is in the shape of a rubber ring and is arranged between the one-way valve 22 and the liquid replenishing hole 21;

[0043] The sealing ring layer located in the inner layer is in the shape of a rubber pad and is arranged between the one-way valve 22, the liquid replenishing hole 21 and the liquid replenishing cover 20.

[0044] The present utility model also claims to protect a battery using the above-mentioned cover plate, which is characterized by comprising a battery body, and a cavity for accommodating electrolyte in the battery body is sealed by the cover plate.

[0045] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the present utility model in each embodiment.

Claims

1. A cover plate for a long-cycle lithium battery, which covers the battery body and together forms a cavity for sealing an electrolyte, characterized in that: It comprises a cover plate body (1), with a positive terminal (12) and a negative terminal (11) respectively arranged on both sides of the cover plate body (1); A one-way liquid replenishing assembly (2) is arranged on the cover plate body (1), a one-way flow channel is arranged inside the one-way liquid replenishing assembly (2), and the flow direction is from the outside to the inside of the cavity, the inlet end of the one-way flow channel is sealed by a liquid replenishing cover (20), and the outlet end of the one-way flow channel leads to the battery body, and the electrolyte is injected into the cavity from the outside of the cover plate body (1) through the one-way flow channel to perform the electrolyte replenishment operation; The cover plate body (1) is also provided with a second valve (3) for releasing electrolyte decomposition gas.

2. A cover plate for a long cycle lithium battery according to claim 1, characterized in that: The one-way liquid replenishing assembly (2) comprises a liquid replenishing hole (21) and a one-way valve (22); the liquid replenishing hole (21) runs through the surface of the cover body (1), and the one-way valve (22) is installed in the liquid replenishing hole (21); the valve path of the one-way valve (22) is the one-way flow path.

3. A cover plate for a long cycle lithium battery according to claim 2, characterized in that: The one-way valve (22) is a granular material valve.

4. The cover plate for a long cycle lithium battery according to claim 2, characterized in that: A sealing ring is arranged between the liquid replenishing hole (21), the one-way valve (22) and the liquid replenishing cover (20) and is used for sealing between the one-way liquid replenishing component (2) and the cover plate body (1).

5. A cover plate for a long cycle lithium battery according to claim 4, characterized in that: The sealing ring is a double-layer sealing ring structure, with the direction close to the cavity as the inner layer, wherein the sealing ring layer located on the outer layer is in the shape of a rubber ring and is arranged between the one-way valve (22) and the liquid replenishing hole (21); The sealing ring layer located at the inner layer is in the shape of a rubber pad and is arranged between the one-way valve (22), the liquid replenishing hole (21) and the liquid replenishing cover (20).

6. The cover plate for a long cycle lithium battery according to claim 1, characterized in that: The cover plate body (1) is also provided with a liquid injection hole (13) for injecting electrolyte into the battery body.

7. The cover plate for a long cycle lithium battery according to claim 1, characterized in that: The second valve (3) is an explosion-proof valve.

8. The cover plate for a long cycle lithium battery according to claim 1, characterized in that: The liquid replenishing cover (20) is an aluminum cover.

9. A cover plate for a long cycle lithium battery according to claim 8, characterized in that: The aluminum cover is provided with a movable aluminum buckle for manually opening and fastening the aluminum cover.

10. A battery using the cover plate according to any one of claims 1 to 9, characterized in that: The invention comprises a battery body, wherein a cavity for accommodating electrolyte is arranged in the battery body and is sealed by a cover plate.

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