Lithium battery containing aluminum-plastic safety cap

Abstract

The utility model discloses a lithium battery containing an aluminum-plastic safety cap, which belongs to the technical field of lithium batteries and comprises a battery main body, a baffle is fixed at one end of a positive electrode of the battery main body, a connecting block is arranged in the middle of the top surface of the baffle, a first groove is formed in the top surface of the connecting block, and a second groove is formed in the top surface of the connecting block. A second groove is formed in the bottom of the inner side of the first groove, a third groove is formed in the bottom face of the baffle, a piston is arranged in the second groove, an aluminum plastic sheet is fixed to the inner side of the first groove, a first vent groove is formed in the outer side of the connecting block, and an air bag is further fixed to the outer side of the connecting block. A second vent groove is formed in the inner side of the air bag, the interior of the second vent groove communicates with the interior of the first vent groove, and a conducting strip is fixed to the upper end of the connecting block. According to the utility model, the problems of limited expansion volume, small formed space and difficulty in completely accommodating all gases of the aluminum-plastic film in the background technology are solved.

Description

A lithium battery with an aluminum-plastic safety cap Technical Field

[0001] This utility model belongs to the field of lithium battery technology, and more specifically, it relates to a lithium battery with an aluminum-plastic safety cap. Background Technology

[0002] When a lithium battery is overcharged, its internal pressure increases sharply. When this pressure exceeds the allowable value, the battery will explode. Excess gas is released through the lithium battery safety valve to prevent the battery from exploding. An existing lithium battery with an aluminum-plastic safety cap (application number CN202122343456.6) uses an aluminum-plastic film. When venting, the aluminum-plastic film expands and deforms to form a space to contain the gas. However, since the expansion volume of the aluminum-plastic film is limited, the space formed is small and cannot completely contain all the gas. Therefore, a lithium battery device with an aluminum-plastic safety cap is proposed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a lithium battery with an aluminum-plastic safety cap. When there is too much gas, the airbag deforms, causing the folded part outside the airbag to open, thereby creating a larger space to accommodate more gas. This solves the problem mentioned in the background technology that the aluminum-plastic film has a limited expansion volume, resulting in a small space that is difficult to completely accommodate all the gas.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery with an aluminum-plastic safety cap, comprising a battery body, a baffle fixed to one end of the positive electrode of the battery body, a connecting block provided in the middle of the top surface of the baffle, a first groove formed on the top surface of the connecting block, a second groove formed at the bottom inner side of the first groove, a third groove formed on the bottom surface of the baffle, a piston provided inside the second groove, an aluminum-plastic sheet fixed inside the first groove, a first venting groove formed on the outer side of the connecting block, an airbag fixed to the outer side of the connecting block, a second venting groove formed inside the airbag, the interior of the second venting groove communicating with the interior of the first venting groove, and a conductive sheet fixed to the upper end of the connecting block, the conductive sheet being electrically connected to the battery body.

[0005] As a preferred embodiment of this invention, the diameter of the second groove is smaller than that of the first groove.

[0006] As a preferred embodiment of this utility model, the interior of the third groove is connected to the interior of the second groove, and the diameter of the third groove is smaller than that of the second groove.

[0007] As a preferred embodiment of this utility model, the piston has a convex cross-section, and the lower end of the piston is inserted into the inner side of the third groove.

[0008] As a preferred embodiment of this utility model, the bottom surface of the aluminum-plastic sheet abuts against the top surface of the piston, and the diameter of the aluminum-plastic sheet is larger than the diameter of the piston.

[0009] As a preferred embodiment of this utility model, the interior of the first ventilation groove is connected to the interior of the first groove.

[0010] As a preferred embodiment of this utility model, the airbag has a ring structure, the airbag is made of aluminum-plastic material, and the outer side of the airbag has a folded structure.

[0011] This utility model provides a lithium battery with an aluminum-plastic safety cap, which has the following advantages:

[0012] 1. In this lithium battery with an aluminum-plastic safety cap, when the battery body is overcharged, the generated gas pressure is transmitted to the piston. When the pressure reaches a set value, the piston pushes open the aluminum-plastic sheet, allowing gas to enter the airbag through the third groove, the second groove, the first groove, the first venting groove, and the second venting groove. The airbag holds a portion of the gas. When there is too much gas, the airbag deforms, causing the folded part outside the airbag to open, thereby forming a larger space to hold more gas. This solves the problem in the background technology that the aluminum-plastic film has a limited expansion volume, resulting in a small space that is difficult to completely contain all the gas.

[0013] 2. The lithium battery with aluminum-plastic safety cap has a piston with a shape that is larger at the top and smaller at the bottom. Based on the principle that pressure equals air pressure multiplied by the area of ​​force application, the piston experiences less force, thereby reducing the force transmitted to the aluminum-plastic sheet through the piston. This reduces the stress on the aluminum-plastic sheet and prevents it from breaking under excessive stress before reaching the specified pressure. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of a lithium battery with an aluminum-plastic safety cap according to this utility model.

[0015] Figure 2 is a schematic diagram of the disassembled structure of a lithium battery with an aluminum-plastic safety cap according to this utility model.

[0016] Figure 3 is an enlarged schematic diagram of point A in Figure 2 of a lithium battery with an aluminum-plastic safety cap according to the present invention.

[0017] Figure 4 is an enlarged schematic diagram of section B in Figure 3 of a lithium battery with an aluminum-plastic safety cap according to the present invention.

[0018] In the diagram: 1. Battery body; 2. Baffle; 3. Connecting block; 4. First groove; 5. Second groove; 6. Third groove; 7. Piston; 8. Aluminum-plastic sheet; 9. First venting groove; 10. Airbag; 11. Second venting groove; 12. Conductive sheet. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please refer to Figures 1 to 4. This utility model provides a technical solution: a lithium battery with an aluminum-plastic safety cap, including a battery body 1. A baffle 2 is fixed to one end of the positive electrode of the battery body 1. A connecting block 3 is provided in the middle of the top surface of the baffle 2. A first groove 4 is formed on the top surface of the connecting block 3. A second groove 5 is formed on the bottom inner side of the first groove 4. A third groove 6 is formed on the bottom surface of the baffle 2. A piston 7 is provided inside the second groove 5. An aluminum-plastic sheet 8 is fixed inside the first groove 4. A first venting groove 9 is formed on the outer side of the connecting block 3. An airbag 10 is also fixed on the outer side of the connecting block 3. A second venting groove 11 is formed on the inner side of the airbag 10. The interior of the second venting groove 11 is connected to the first venting groove 9. The interior of the first venting groove 9 is connected. A conductive sheet 12 is fixed at the upper end of the connecting block 3. The conductive sheet 12 is electrically connected to the battery body 1. The diameter of the second groove 5 is smaller than that of the first groove 4. The interior of the third groove 6 is connected to the interior of the second groove 5. The diameter of the third groove 6 is smaller than that of the second groove 5. The cross-section of the piston 7 is convex. The lower end of the piston 7 is inserted into the inner side of the third groove 6. The bottom surface of the aluminum-plastic sheet 8 abuts against the top surface of the piston 7. The diameter of the aluminum-plastic sheet 8 is larger than that of the piston 7. The interior of the first venting groove 9 is connected to the interior of the first groove 4. The airbag 10 is annular. The airbag 10 is made of aluminum-plastic material. The outer side of the airbag 10 is folded.

[0023] When the battery body 1 overcharges, the generated gas pressure is transmitted to the piston 7. When the pressure reaches the set value, the piston 7 pushes open the aluminum-plastic sheet 8, allowing the gas to pass through the third groove 6, the second groove 5, the first groove 4, the first venting groove 9, and the second venting groove 11 into the airbag 10. The airbag 10 contains a portion of the gas. When there is too much gas, the airbag 10 deforms, causing the folded part outside the airbag 10 to open, thereby forming a larger space to contain more gas. This solves the problem in the background technology that the aluminum-plastic film has a limited expansion volume, forming a small space that is difficult to completely contain all the gas.

[0024] The specific usage and function of this embodiment: When the battery body 1 is overcharged, the gas pressure generated is transmitted to the piston 7. When the pressure reaches the set value, the piston 7 pushes open the aluminum-plastic sheet 8, so that the gas passes through the third groove 6, the second groove 5, the first groove 4, the first venting groove 9 and the second venting groove 11 and enters the airbag 10. The airbag 10 contains a part of the gas. When there is too much gas, the airbag 10 deforms, so that the folded part outside the airbag 10 is opened, thereby forming a larger space to contain more gas.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium battery with an aluminum-plastic safety cap, comprising a battery body (1), characterized in that: A baffle (2) is fixed at one end of the positive electrode of the battery body (1). A connecting block (3) is provided in the middle of the top surface of the baffle (2). A first groove (4) is provided on the top surface of the connecting block (3). A second groove (5) is provided at the bottom of the inner side of the first groove (4). A third groove (6) is provided on the bottom surface of the baffle (2). A piston (7) is provided inside the second groove (5). An aluminum-plastic sheet (8) is fixed inside the first groove (4). A first venting groove (9) is provided on the outer side of the connecting block (3). An airbag (10) is also fixed on the outer side of the connecting block (3). A second venting groove (11) is provided inside the airbag (10). The interior of the second venting groove (11) is connected to the interior of the first venting groove (9). A conductive sheet (12) is fixed at the upper end of the connecting block (3). The conductive sheet (12) is electrically connected to the battery body (1).

2. The lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The diameter of the second groove (5) is smaller than that of the first groove (4).

3. A lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The interior of the third groove (6) is connected to the interior of the second groove (5), and the diameter of the third groove (6) is smaller than that of the second groove (5).

4. A lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The piston (7) has a convex cross-section, and the lower end of the piston (7) is inserted into the inner side of the third groove (6).

5. A lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The bottom surface of the aluminum-plastic sheet (8) abuts against the top surface of the piston (7), and the diameter of the aluminum-plastic sheet (8) is larger than the diameter of the piston (7).

6. A lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The interior of the first ventilation groove (9) is connected to the interior of the first groove (4).

7. A lithium battery with an aluminum-plastic safety cap according to claim 1, characterized in that: The airbag (10) has a ring structure, the airbag (10) is made of aluminum-plastic material, and the outer side of the airbag (10) has a folded structure.

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