Aluminum film leak-proof dry battery

Abstract

The utility model provides an aluminum film leak-proof dry battery, comprising an aluminum film shell, a positive electrode pressure relief cap and an aluminum film wrapping assembly. The positive electrode pressure relief cap is fixedly installed at either end of the aluminum film shell, the positive electrode pressure relief cap is located above the aluminum film wrapping assembly, and the two are fixedly connected. The aluminum film wrapping assembly is wound and fixed inside the aluminum film shell of the battery. The utility model innovatively designs a positive electrode pressure relief cap with a double sealing mechanism, which can effectively discharge the gas inside the battery and avoid electrolyte leakage during strong external impact. Under impact, the pressure relief valve body deforms to discharge the gas, and the seal is automatically reset after the pressure is released. This design ensures the safety of the battery under high pressure or impact, effectively prevents the risk of electrolyte leakage, and improves the overall performance and reliability of the battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry batteries, and in particular relates to an aluminum film leak-proof dry battery. Background Art

[0002] Aluminum film leakproof dry cell is a specially designed dry cell, its main feature is the use of aluminum film as a sealing and leakproof material. This design is intended to increase the battery life and safety, and prevent the leakage of electrolyte inside the battery.

[0003] In order to prevent the aluminum film leak-proof dry cell from producing gas during over-discharge, which may cause the cell to swell, be damaged or even leak, the dry cell is specially equipped with a cap with a pressure relief function. At present, the pressure relief cap of the dry cell mainly achieves pressure relief through the unique resilience of the valve sheet or by relying on elastic elements. However, this design has significant defects. When the outer shell of the dry cell is subjected to a strong external impact, the outer shell will deform, thereby squeezing the air and gel electrolyte inside. The force generated by the squeezing is sufficient to open the pressure relief cap, causing the gel electrolyte inside to leak along with the air, thereby causing a large loss of electrolyte.

[0004] Therefore, it is very necessary to invent a kind of aluminum film leak-proof dry cell. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an aluminum film leak-proof dry battery, comprising an aluminum film shell of the battery, a positive electrode pressure relief cap of the battery and an aluminum film wrapping assembly, wherein the positive electrode pressure relief cap of the battery is fixedly installed at either end of the aluminum film shell of the battery, the positive electrode pressure relief cap of the battery is located above the aluminum film wrapping assembly, and the two are fixedly connected, and the aluminum film wrapping assembly is wound and fixed inside the aluminum film shell of the battery;

[0006] The battery positive electrode pressure relief cap includes a cap valve seat, a positive electrode sheet, a positive cap, an air bleed hole, an insulating sleeve, a pressure relief port and a pressure relief valve body. The positive electrode sheet fixedly installed below the cap valve seat is connected to the aluminum film wrapping assembly; the positive cap is fixedly installed above the cap valve seat, a plurality of air bleed holes are opened on the positive cap, and the outside of the positive cap and the cap valve seat are covered with the insulating sleeve; the pressure relief port is opened in the middle of the cap valve seat, and the pressure relief valve body is fixedly installed on the inner side of the pressure relief port.

[0007] Preferably, the pressure relief port and the pressure relief valve body installed on the cap valve seat are located at the lower inner side of the positive electrode cap, and the air leakage holes opened on the positive electrode cap are located around the pressure relief port and the pressure relief valve body.

[0008] Preferably, the pressure relief port opened on the cap valve seat is a rectangular notch, and the pressure relief port is located on one side of the positive electrode sheet and above the aluminum film wrapping assembly; the pressure relief port is blocked and sealed by the pressure relief valve body.

[0009] Preferably, the pressure relief valve body is a "Y"-shaped spring valve plate, and the pressure relief valve body is composed of a V-shaped portion and an elastic portion. The inner surface of the upper part of the V-shaped portion of the pressure relief valve body is in close contact with the upper surface of the cap valve seat, and there is a distance between the inner surface of the lower part of the V-shaped portion and the lower surface of the cap valve seat.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The utility model innovatively introduces a battery positive electrode pressure relief cap with a double sealing mechanism. This design not only effectively discharges gas from the battery, but also successfully avoids the problem of internal gel electrolyte leaking along with air when the battery casing is subjected to a strong external impact. Specifically, when the battery casing is subjected to a strong external impact, the pressure relief valve body will deform under the action of pressure. In this process, some gas will be discharged through the tiny gaps generated. Due to the high pressure, the pressure relief valve body will continue to deform, but after deformation to a certain extent, it will use itself to reseal again. This design effectively prevents the leakage of gel electrolyte due to the rapid generation of high internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the explosion structure of the positive electrode pressure relief cap of the battery.

[0013] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 3 The utility model is a half-section structural schematic diagram of a positive electrode pressure relief cap of a battery.

[0015] In the figure:

[0016] Battery aluminum film shell 1, battery positive electrode pressure relief cap 2, cap valve seat 21, positive electrode sheet 22, positive electrode cap 23, air vent 24, isolation sleeve 25, pressure relief port 26, pressure relief valve body 27, aluminum film wrapping assembly 3. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0018] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0019] As attached Figure 1 To Attachment Figure 3 As shown:

[0020] The utility model provides an aluminum film leak-proof dry battery, comprising an aluminum film shell 1, a positive electrode pressure relief cap 2 and an aluminum film wrapping assembly 3. The positive electrode pressure relief cap 2 is fixedly installed at either end of the battery aluminum film shell 1, the positive electrode pressure relief cap 2 is located above the aluminum film wrapping assembly 3, and the two are fixedly connected, and the aluminum film wrapping assembly 3 is wound and fixed inside the battery aluminum film shell 1.

[0021] The battery positive electrode pressure relief cap 2 includes a cap valve seat 21, a positive electrode sheet 22, a positive electrode cap 23, a vent hole 24, an insulating sleeve 25, a pressure relief port 26 and a pressure relief valve body 27. The positive electrode sheet 22 fixedly installed below the cap valve seat 21 is connected to the aluminum film wrapping assembly 3; the positive electrode cap 23 is fixedly installed above the cap valve seat 21, and a plurality of the vent holes 24 are provided on the positive electrode cap 23. The outside of the positive electrode cap 23 and the cap valve seat 21 are covered with the insulating sleeve 25; the pressure relief port 26 is provided in the middle of the cap valve seat 21, and the pressure relief valve body 27 is fixedly installed inside the pressure relief port 26. The battery positive electrode pressure relief cap 2 can realize a double sealing mechanism. This design can effectively realize the discharge of gas inside the battery, and also successfully avoid the problem that the internal gel electrolyte leaks along with the air when the battery shell is subjected to a strong external impact.

[0022] Embodiment 1:

[0023] Specifically, the pressure relief port 26 and the pressure relief valve body 27 installed on the cap valve seat 21 are located at the lower inner side of the positive electrode cap 23, and the air leakage hole 24 opened on the positive electrode cap 23 is located around the pressure relief port 26 and the pressure relief valve body 27. The design of the air leakage hole 24 enables the battery to quickly discharge gas when the internal pressure is too high, thereby avoiding battery swelling or explosion.

[0024] Specifically, the pressure relief port 26 opened on the cap valve seat 21 is a rectangular slot, and the pressure relief port 26 is located on one side of the positive electrode sheet 22 and above the aluminum film wrapping assembly 3; the pressure relief port 26 is blocked and sealed by the pressure relief valve body 27 to form an effective seal.

[0025] Specifically, the pressure relief valve body 27 is a "Y"-shaped spring valve plate. The pressure relief valve body 27 is composed of a V-shaped portion and an elastic portion. The inner surface of the upper part of the V-shaped portion of the pressure relief valve body 27 is in close contact with the upper surface of the cap valve seat 21, forming an effective seal. Under normal circumstances, a certain distance is maintained between the inner surface of the lower part of the V-shaped portion and the lower surface of the cap valve seat 21. This distance allows the gas to smoothly enter and push the V-shaped portion upward when the internal pressure of the battery increases, thereby realizing the pressure relief function. When the pressure inside the battery increases due to chemical reactions or external factors, the gas will enter through the gap between the lower part of the V-shaped portion and the lower surface of the cap valve seat 21, and push the V-shaped portion upward, and the gas will be quickly discharged through the gap. Once the pressure still pushes the V-shaped portion upward, the inner surface of the lower part of the V-shaped portion will contact the lower surface of the cap valve seat, and then an effective seal will be formed again, thereby reducing the internal pressure of the battery and preventing the leakage of the battery's gel electrolyte. At the same time, since the V-shaped portion is supported by the elastic portion, when the gas is discharged, the elastic portion will help the V-shaped portion to quickly return to its original position and re-form a seal with the upper surface of the cap valve seat.

[0026] Embodiment 2:

[0027] Under normal working conditions, the upper inner surface of the V-shaped portion of the pressure relief valve body 27 is in close contact with the upper surface of the cap valve seat 21, forming an effective seal to prevent leakage of the gel electrolyte inside the battery. At the same time, a certain distance is maintained between the lower inner surface of the V-shaped portion and the lower surface of the cap valve seat 21, and this distance provides a channel for the flow of gas when the internal pressure of the battery increases. When the pressure inside the battery increases due to chemical reactions or external factors, the gas will enter through the gap between the lower part of the V-shaped portion and the lower surface of the cap valve seat 21, and push the V-shaped portion upward. In this process, since the V-shaped portion has a certain elasticity and movement space, it can gradually move upward as the gas pressure increases, while allowing the gas to be discharged through the pressure relief port 26, thereby reducing the pressure inside the battery and preventing the battery from swelling or exploding. If the battery shell is subjected to a strong external impact, the V-shaped portion will move upward significantly due to the sudden increase in pressure. During this process, the upward movement of the V-shaped portion can still discharge some gas and achieve pressure relief inside the battery. However, after moving up to a certain extent, the inner surface below the V-shaped portion will contact the surface below the cap valve seat 21, and then an effective seal will be re-formed, thereby reducing the internal pressure of the battery and preventing the battery's gel electrolyte from leaking, avoiding the discharge of the gel electrolyte along with the gas. In addition, after the gas is discharged or the internal pressure is reduced, due to the action of the elastic portion of the pressure relief valve body 27, the V-shaped portion will quickly reset and come into close contact with the upper surface of the cap valve seat 21 again, achieving re-sealing of the battery.

[0028] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. An aluminum film leakproof dry battery, characterized in that: The battery comprises an aluminum film shell (1), a positive electrode pressure relief cap (2) and an aluminum film wrapping assembly (3), wherein the positive electrode pressure relief cap (2) is fixedly mounted on either end of the battery aluminum film shell (1), the positive electrode pressure relief cap (2) is located above the aluminum film wrapping assembly (3), and the two are fixedly connected, and the aluminum film wrapping assembly (3) is wound and fixed inside the battery aluminum film shell (1); The battery positive electrode pressure relief cap (2) comprises a cap valve seat (21), a positive electrode sheet (22), a positive electrode cap (23), an air leakage hole (24), an insulating sleeve (25), a pressure relief port (26) and a pressure relief valve body (27); the positive electrode sheet (22) fixedly mounted below the cap valve seat (21) is connected to the aluminum film wrapping assembly (3); the positive electrode cap (23) is fixedly mounted above the cap valve seat (21), a plurality of air leakage holes (24) are provided on the positive electrode cap (23), and the outside of the positive electrode cap (23) and the cap valve seat (21) are covered with the insulating sleeve (25); the pressure relief port (26) is provided in the middle of the cap valve seat (21), and the pressure relief valve body (27) is fixedly mounted inside the pressure relief port (26).

2. The aluminum film leakproof dry battery according to claim 1, characterized in that: The pressure relief port (26) and the pressure relief valve body (27) installed on the cap valve seat (21) are located at the lower inner side of the positive electrode cap (23), and the air leakage hole (24) opened on the positive electrode cap (23) is located around the pressure relief port (26) and the pressure relief valve body (27).

3. The aluminum film leakproof dry battery according to claim 1, characterized in that: The pressure relief port (26) provided on the cap valve seat (21) is a rectangular notch, and the pressure relief port (26) is located on one side of the positive electrode sheet (22) and above the aluminum film wrapping assembly (3); the pressure relief port (26) is blocked and sealed by the pressure relief valve body (27).

4. The aluminum film leakproof dry battery according to claim 1, characterized in that: The pressure relief valve body (27) is a "Y"-shaped spring valve plate. The pressure relief valve body (27) is composed of a V-shaped portion and an elastic portion. The inner surface of the upper portion of the V-shaped portion of the pressure relief valve body (27) is in close contact with the upper surface of the cap valve seat (21), while a gap exists between the inner surface of the lower portion of the V-shaped portion and the lower surface of the cap valve seat (21).

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