Explosion-proof structure of lithium battery cover plate

Abstract

The utility model relates to the technical field of lithium battery cover plates, and particularly discloses a lithium battery cover plate explosion-proof structure which comprises a cover plate body, the cover plate body is provided with an explosion-proof structure, and the explosion-proof structure comprises a cylinder I, a cylinder II, a cylinder III, a cylinder cover, a sealing cover plate and a spring, the first axial ends of the first cylinder, the second cylinder and the third cylinder are all fixedly connected to the bottom of the cover plate body, the second cylinder is arranged in the third cylinder, the first cylinder is arranged in the second cylinder, the cylinder cover is in threaded connection with the outside of the third cylinder, the sealing cover plate is arranged in the cylinder cover, and a connecting shaft is vertically and fixedly connected to the first end face of the sealing cover plate. The connecting shaft is arranged in the first cylinder in a sliding fit mode, a spring is arranged between the second end face of the sealing cover plate and the bottom wall of the cylinder cover in an abutting mode, a sealing rubber mat is bonded to the first end face of the sealing cover plate, a plurality of air inlet holes are formed in the circumferential face of the third cylinder, and a plurality of exhaust holes are formed in the cover plate body and correspond to the gap between the first cylinder and the second cylinder. The one-way exhaust valve can exhaust in one way and is high in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery cover plates, in particular to an explosion-proof structure of a lithium battery cover plate. Background Art

[0002] To prevent an explosion caused by excessive internal pressure in lithium batteries, an explosion-proof diaphragm is installed on the lithium battery cover. When the battery pressure rises to exceed the set pressure of the explosion-proof diaphragm, the explosion-proof diaphragm ruptures and the gas in the battery is released, thereby reducing the risk of battery explosion.

[0003] The existence of explosion-proof diaphragm can have a good explosion-proof effect on lithium batteries, but it also has defects. When the explosion-proof membrane ruptures, the inside of the battery is connected to the outside world, and oxygen and moisture in the air can easily enter the battery, causing the charged negative electrode to oxidize, causing the battery temperature to rise, and increasing the risk of thermal runaway of the battery. Utility Model Content

[0004] In order to solve the problems mentioned in the background technology, the purpose of the utility model is to provide an explosion-proof structure of a lithium battery cover.

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

[0006] The explosion-proof structure of a lithium battery cover comprises a cover body, on which an explosion-proof structure is arranged, the explosion-proof structure comprises a tube one, a tube two, a tube three, a tube cover, a sealing cover plate and a spring, the first axial ends of the tube one, the tube two and the tube three are all fixedly connected to the bottom of the cover body, the tube two is arranged inside the tube three, the tube one is arranged inside the tube two, the tube cover is threadedly connected to the second axial end of the tube three, the sealing cover plate is arranged in the tube cover, a connecting shaft is vertically fixedly connected to the first end face of the sealing cover plate, the connecting shaft is slidably fitted in the tube one, a spring is abutted between the second end face of the sealing cover plate and the bottom wall of the tube cover, a sealing rubber pad is bonded to the first end face of the sealing cover plate, the sealing rubber pad abuts on the second ports of the tube two and the tube three, a plurality of air inlet holes are arranged on the circumferential surface of the tube three, and a plurality of exhaust holes are opened on the cover body corresponding to the gap between the tube one and the tube two.

[0007] Furthermore, it also includes a damping rubber ring, which is sleeved on the connecting shaft and abuts against the inner wall of the cylinder.

[0008] Furthermore, a ring body is protrudingly formed on the outer wall of the cylinder three, and the cylinder cover is threadedly connected to the ring body.

[0009] The beneficial effects of the utility model are as follows: when the internal air pressure of the battery is too high, the gas enters the gap between the tube three and the tube two from the air inlet hole, thereby pushing the sealing cover plate downward, and then the gas enters the gap between the tube two and the tube one, and is finally discharged from the exhaust hole, which has the traditional air release function. When the gas is released, under the action of the spring, the sealing gasket again contacts the second port of the tube three and the tube two, and isolates the inside of the battery from the outside world, preventing oxygen and moisture from entering the battery through the pressure relief hole, reducing the risk of battery loss of control, and improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an axonometric diagram of an embodiment of the utility model;

[0011] Figure 2 An exploded view of an embodiment of the utility model;

[0012] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0013] Explanation of the accompanying figures: 1. Cover plate body, 11. Cylinder one, 12. Cylinder two, 13. Cylinder three, 131. Air inlet, 132. Ring body, 14. Exhaust hole, 2. Cylinder cover, 3. Sealing cover plate, 31. Connecting shaft, 4. Spring, 5. Sealing rubber pad, 6. Damping rubber ring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the utility model.

[0015] like Figure 1-Figure 3As shown, the lithium battery cover explosion-proof structure comprises a cover body 1, on which an explosion-proof structure is arranged, the explosion-proof structure comprises a cylinder 11, a cylinder 2 12, a cylinder 3 13, a cylinder cover 2, a sealing cover plate 3 and a spring 4, the first ends of the cylinder 11, the cylinder 2 12 and the cylinder 3 13 are all fixedly connected to the bottom of the cover body 1, and the cylinder 2 12 is arranged inside the cylinder 3 13, the cylinder 1 11 is arranged inside the cylinder 2 12, the cylinder cover 2 is threadedly connected to the outside of the cylinder 3 13 axis, the bottom wall of the cylinder cover 2 is spaced from the second end of the cylinder 3 13, and the sealing cover plate 3 is arranged on the cylinder 11. A connecting shaft 31 is vertically fixedly connected to the first end face of the sealing cover plate 3 between the bottom wall of the cover 2 and the second port of the cylinder three 13, and the connecting shaft 31 is slidably fitted in the cylinder one 11. A spring 4 is abutted between the second end face of the sealing cover plate 3 and the bottom wall of the cylinder cover 2. A sealing rubber gasket 5 is bonded to the first end face of the sealing cover plate 3, and the sealing rubber gasket 5 abuts against the second ports of the cylinder two 12 and the cylinder three 13. A plurality of air inlet holes 131 are arranged on the circumferential surface of the cylinder three 13, and four exhaust holes 14 are opened on the cover plate body 1 corresponding to the gap between the cylinder one 11 and the cylinder two 12.

[0016] When the internal air pressure of the battery is too high, the gas enters the gap between the third tube 13 and the second tube 12 from the air inlet 131, thereby pushing the sealing cover plate 3 downward, and then the gas enters the gap between the second tube 12 and the first tube 11, and is finally discharged from the exhaust hole 14, which has a traditional air release function. When the gas is released, under the action of the spring 4, the sealing gasket 5 again contacts the second port of the third tube 13 and the second tube 12, and isolates the inside of the battery from the outside world, preventing oxygen and moisture from entering the battery through the pressure relief hole, reducing the risk of battery loss of control, and improving the safety of the battery.

[0017] In this embodiment, a damping rubber ring 6 is also included. The damping rubber ring 6 is sleeved on the connecting shaft 31. The damping rubber ring 6 is in conflict with the inner wall of the cylinder 11. The damping rubber ring 6 is provided so that when the sealing cover plate 3 is opened, the damping rubber ring 6 can prevent the sealing cover plate 3 from rebounding immediately, thereby improving the smoothness of the exhaust.

[0018] In this embodiment, a ring body 132 is protruding from the outer wall of the cylinder 13, and the cylinder cover 2 is threadedly connected to the ring body 132. The arrangement is reasonable and convenient for installing the sealing cover plate 3 and the spring 4.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. All modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery cover plate explosion-proof structure, comprising a cover plate body (1), wherein the cover plate body (1) is provided with an explosion-proof structure, characterized in that: The explosion-proof structure comprises a cylinder 1 (11), a cylinder 2 (12), a cylinder 3 (13), a cylinder cover (2), a sealing cover plate (3) and a spring (4); the first axial ends of the cylinder 1 (11), the cylinder 2 (12) and the cylinder 3 (13) are all fixed to the bottom of the cover plate body (1); the cylinder 2 (12) is arranged inside the cylinder 3 (13); the cylinder 1 (11) is arranged inside the cylinder 2 (12); the cylinder cover (2) is threadedly connected to the outside of the cylinder 3 (13); the sealing cover plate (3) is arranged inside the cylinder cover (2); the vertical fixed spring on the first end face of the sealing cover plate (3) A connecting shaft (31) is provided, and the connecting shaft (31) is slidably fitted in the cylinder one (11). A spring (4) is provided between the second end face of the sealing cover plate (3) and the bottom wall of the cylinder cover (2). A sealing rubber gasket (5) is adhered to the first end face of the sealing cover plate (3), and the sealing rubber gasket (5) abuts against the second ports of the cylinder two (12) and the cylinder three (13). A plurality of air inlet holes (131) are provided on the circumference of the cylinder three (13), and a plurality of exhaust holes (14) are provided on the cover plate body (1) corresponding to the gap between the cylinder one (11) and the cylinder two (12).

2. The explosion-proof structure of the lithium battery cover according to claim 1, characterized in that: It also includes a damping rubber ring (6). The connecting shaft (31) is sleeved with the damping rubber ring (6), and the damping rubber ring (6) is in conflict with the inner wall of the cylinder (11).

3. The explosion-proof structure of the lithium battery cover according to claim 1, characterized in that: The outer wall of the cylinder three (13) is protrudingly formed with a ring body (132), and the cylinder cover (2) is threadedly connected to the ring body (132).

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