Large cylindrical battery safety valve and battery

Abstract

The utility model belongs to the technical field of large cylindrical batteries, and particularly relates to a large cylindrical battery safety valve and a battery, which comprise a battery main body, a cover cap is arranged at the top end of the battery main body, a safety valve main body is arranged on the cover cap, the safety valve further comprises a safety valve shell, and the safety valve shell is arranged on the cover cap; the bottom baffle is arranged in the safety valve shell, a bottom sealing gasket is arranged between the bottom baffle and the safety valve shell, a bottom clamping spring is arranged at the bottom of the bottom baffle, the bottom clamping spring and the inner wall of the safety valve shell are clamped, and a check block is arranged at the bottom of the bottom clamping spring; according to the utility model, the safety valve main body is arranged on the battery main body, so that gas generated in the battery main body can be exhausted in time, the structural stability of the battery main body is enhanced, the performance of the battery main body is not reduced, and the safety and the practicability are high.

Description

Technical Field

[0001] This utility model relates to the field of large cylindrical battery technology, and in particular to a safety valve and battery for a large cylindrical battery. Background Technology

[0002] During the lithium battery formation stage, the gases generated inside the battery cannot be expelled, increasing the internal pressure and posing a potential threat to the battery's structural safety. Simultaneously, the increased internal pressure caused by gas generation slows down lithium-ion transfer, reducing the battery's discharge rate and lifespan. To address these issues, we propose a large cylindrical battery safety valve and battery to solve these problems. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing lithium battery technology, such as the inability to expel gases generated inside the battery during the formation stage, which increases internal pressure and poses a potential threat to battery structural safety. Furthermore, the increased internal pressure caused by gas generation slows down lithium-ion transfer, reducing the discharge rate and lifespan of the lithium battery. Therefore, this invention proposes a large cylindrical battery safety valve and battery.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A safety valve for a large cylindrical battery and the battery itself, comprising a battery body, a cap mounted on the top of the battery body, and a safety valve body mounted on the cap, the safety valve further comprising:

[0006] A safety valve housing, which is mounted on a cap;

[0007] A bottom baffle is disposed inside the safety valve housing. A bottom sealing gasket is disposed between the bottom baffle and the safety valve housing. A bottom retaining spring is disposed at the bottom of the bottom baffle and is engaged with the inner wall of the safety valve housing. A stop block is disposed at the bottom of the bottom retaining spring. A locking screw is threaded to the bottom end of the safety valve housing. A graphene-based separation membrane is disposed between the locking screw and the stop block. A top sealing gasket is disposed between the locking screw and the safety valve housing.

[0008] A slot baffle is placed on top of the bottom baffle. A spring is installed on the top of the slot baffle, and a top baffle is installed on the top of the spring. The top baffle is located inside the safety valve housing. A top retaining spring is provided on the top of the top baffle and is engaged with the inner wall of the safety valve housing.

[0009] As a preferred embodiment of this utility model, two annular grooves are formed on the inner wall of the safety valve housing, and the top retaining spring and the bottom retaining spring are respectively fitted into the two annular grooves.

[0010] As a preferred embodiment of this utility model, the top baffle is provided with multiple air holes, and the bottom baffle and the block are both hollow.

[0011] As a preferred embodiment of this utility model, a sealing ring is provided at the bottom of the card slot baffle, and the sealing ring is in contact with the top of the bottom baffle.

[0012] As a preferred embodiment of this invention, the graphene-based separation membrane is a permeable membrane.

[0013] As a preferred embodiment of this utility model, the cap has a round hole and a recessed step at the bottom. Beneficial effects

[0014] 1. The safety valve body, which can be passively switched on and off, discharges the gas generated inside the battery body, avoiding the increase in internal pressure of the battery body due to gas generation, CID flipping, VENT rupture, and the danger of corrosion, battery failure, explosion and other hazards caused by electrolyte leakage.

[0015] 2. Before the battery body leaves the factory, it can be placed in a vacuum environment to remove the gas inside the battery body, reduce the internal gas pressure of the battery body, and increase the battery body life;

[0016] This invention, by installing a safety valve on the battery body, can promptly release the gas generated inside the battery body, enhance the structural stability of the battery body, without reducing the performance of the battery body, and has strong safety and practicality. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural view of the battery body of this utility model;

[0018] Figure 2 This is a main sectional view of the battery body of this utility model;

[0019] Figure 3 This is a main sectional view of the safety valve body of this utility model;

[0020] Figure 4 This is a three-dimensional structural view of the safety valve body of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the top baffle of this utility model.

[0022] In the diagram: 1. Safety valve housing; 2. Top retaining ring; 3. Top baffle; 4. Spring; 5. Top sealing gasket; 6. Recessed baffle; 7. Sealing ring; 8. Bottom sealing gasket; 9. Bottom baffle; 10. Bottom retaining ring; 11. Stop block; 12. Graphene-based separation membrane; 13. Locking screw; 14. Battery body; 15. Cap; 16. Safety valve body. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0024] Reference Figures 1-5 A safety valve for a large cylindrical battery and the battery itself, comprising a battery body 14, a cap 15 mounted on the top of the battery body 14, a safety valve body 16 mounted on the cap 15, and the safety valve further comprising:

[0025] Safety valve housing 1, which is mounted on cap 15;

[0026] Bottom baffle 9 is located inside the safety valve housing 1. Bottom sealing gasket 8 is provided between bottom baffle 9 and safety valve housing 1. Bottom retaining spring 10 is provided at the bottom of bottom baffle 9. Bottom retaining spring 10 is engaged with the inner wall of safety valve housing 1. Stop block 11 is provided at the bottom of bottom retaining spring 10. Locking screw 13 is threadedly connected to the bottom end of safety valve housing 1. Graphene-based separation membrane 12 is provided between locking screw 13 and stop block 11. Top sealing gasket 5 is provided between locking screw 13 and safety valve housing 1.

[0027] The slot baffle 6 is placed on top of the bottom baffle 9. A spring 4 is installed on the top of the slot baffle 6. A top baffle 3 is installed on the top of the spring 4. The top baffle 3 is located inside the safety valve housing 1. A top retaining spring 2 is provided on the top of the top baffle 3. The top retaining spring 2 is engaged with the inner wall of the safety valve housing 1.

[0028] As a preferred embodiment of this utility model, two annular grooves are provided on the inner wall of the safety valve housing 1, and the top retaining spring 2 and the bottom retaining spring 10 are respectively fitted into the two annular grooves, which can limit and fix the top retaining spring 2 and the bottom retaining spring 10.

[0029] As a preferred embodiment of this utility model, the top baffle 3 is provided with multiple air holes, and the bottom baffle 9 and the baffle block 11 are both hollow, so that gas can flow through when the pressure is released.

[0030] As a preferred embodiment of this utility model, a sealing ring 7 is provided at the bottom of the card slot baffle 6. The sealing ring 7 is in contact with the top of the bottom baffle 9, and the sealing ring 7 provides a sealing effect between the bottom baffle 9 and the card slot baffle 6.

[0031] As a preferred embodiment of this utility model, the graphene-based separation membrane 12 is a permeable membrane that allows CO2 molecules to pass through but does not allow other molecules to pass through.

[0032] As a preferred embodiment of this utility model, the cap 15 has a round hole and a recessed step at the bottom, and the round hole provides an installation position for the safety valve body 16.

[0033] The working principle of this utility model is as follows: In use, the top baffle 3 is secured to the corresponding position of the safety valve housing 1 using the top retaining spring 2. The spring 4, retaining plate 6, sealing ring 7, and bottom sealing gasket 8 are sequentially placed inside the safety valve housing 1. The bottom baffle 9 is secured to the corresponding position of the safety valve housing 1 using the bottom retaining spring 10. The safety valve body 16 is placed on the cap 15, with the top of the safety valve body 16 outside the battery body 14. The safety valve body 16 and the cap 15 are sealed by the top sealing gasket 5. The baffle 11 and the graphene-based separation membrane 12 are placed into the bottom space of the safety valve housing 1. The locking screw 13 is then fitted into the bottom of the safety valve housing 1. Tighten to lock the safety valve body 16 onto the cap 15. The main component of the gas produced inside the battery body 14 is CO2. When the battery body 14 produces gas, the internal pressure of the battery body 14 increases. The graphene-based separation membrane 12 is a selectively permeable membrane, and CO2 gas molecules are gathered in the bottom chamber of the safety valve body 16. Due to the pressure difference between the inside and outside, the spring 4 is compressed, and the sealing ring 7 returns to its original shape. At this time, the gas does not leak out, and the pressure further increases. A gap appears between the slot baffle 6 and the bottom baffle 9, and the CO2 gas is discharged into the atmosphere through this gap. Electrolyte and other substances will not be discharged from the battery, and air and water vapor will not enter the battery body 14.

[0034] 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 large cylindrical battery safety valve and battery comprising a battery body (14), a top end of the battery body (14) is provided with a cap (15), the cap (15) is provided with a safety valve body (16), characterized in that, The safety valve also includes: Safety valve housing (1), said safety valve housing (1) is mounted on cap (15); Bottom baffle (9) is disposed inside the safety valve housing (1). A bottom sealing gasket (8) is disposed between the bottom baffle (9) and the safety valve housing (1). A bottom retaining spring (10) is disposed at the bottom of the bottom baffle (9). The bottom retaining spring (10) is engaged with the inner wall of the safety valve housing (1). A stop block (11) is disposed at the bottom of the bottom retaining spring (10). A locking screw (13) is threaded to the bottom end of the safety valve housing (1). A graphene-based separation membrane (12) is disposed between the locking screw (13) and the stop block (11). A top sealing gasket (5) is disposed between the locking screw (13) and the safety valve housing (1). The slot baffle (6) is placed on top of the bottom baffle (9). A spring (4) is installed on the top of the slot baffle (6). A top baffle (3) is installed on the top of the spring (4). The top baffle (3) is located inside the safety valve housing (1). A top retaining spring (2) is provided on the top of the top baffle (3). The top retaining spring (2) is engaged with the inner wall of the safety valve housing (1).

2. A safety valve for a large cylindrical battery according to claim 1, wherein The inner wall of the safety valve housing (1) has two annular slots, and the top retaining spring (2) and the bottom retaining spring (10) are respectively fitted into the two annular slots.

3. A safety valve for a large cylindrical battery according to claim 1, wherein The top baffle (3) has multiple air holes, and the bottom baffle (9) and the block (11) are both hollow.

4. A safety valve for a large cylindrical battery according to claim 1, wherein The bottom of the slot baffle (6) is provided with a sealing ring (7), which is in contact with the top of the bottom baffle (9).

5. A large cylindrical battery safety valve and battery according to claim 1, wherein The graphene-based separation membrane (12) is a permeable membrane.

6. A large cylindrical battery safety valve and battery according to claim 1, wherein The cap (15) has a round hole and a recessed step at the bottom.

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