Lithium battery pack of electric vehicle

Abstract

The lithium battery pack comprises a box body, a bottom plate is arranged in the box body, a fire extinguishing bag is arranged on the periphery of the bottom plate, a pipe opening is formed in the upper surface of the fire extinguishing bag, an anti-explosion pipe is arranged in the middle of a box cover, and a pressure relief opening is formed in the outer surface of the anti-explosion pipe. A sealing block is fixedly connected to the inner wall of the explosion-proof pipe, a top block is arranged on the outer surface of the sealing block in a penetrating mode, a sliding block is fixedly connected to the end, away from the sealing block, of the top block, and a single lithium battery is arranged in the box body; the fire extinguishing bag and the flame-retardant cloth are arranged in the box body, the fire extinguishing bag can be melted by high temperature generated when the lithium battery breaks down, so that a fire extinguishing agent in the fire extinguishing bag flows out to cool and extinguish the lithium battery, and the flame-retardant cloth can further carry out flame-retardant protection on the lithium battery.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery pack for electric vehicles. Background Art

[0002] The power source of electric vehicles is the battery installed on the vehicle. With the advancement of technology, electric vehicles have begun to use lithium batteries. Lithium batteries have many advantages, such as no emissions, small size, strong power and long endurance, but their safety performance requires extra attention.

[0003] Lithium batteries are usually installed and used in groups, and a group of batteries are installed together in a battery box. Lithium battery failures are prone to fire and explosion. Due to the lack of fireproof and explosion-proof structures in the battery box, people have little time to react and deal with the accident. Failure to deal with it in time will cause a lot of losses in a short time. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art and proposes a lithium battery pack for an electric vehicle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lithium battery pack for an electric vehicle comprises a box body, wherein a bottom plate is provided inside the box body, fire extinguishing bags are arranged around the bottom plate, a nozzle is provided on the upper surface of the fire extinguishing bag, an explosion-proof tube is provided in the middle of the box cover, a pressure relief port is provided on the outer surface of the explosion-proof tube, a sealing block is fixedly connected to the inner wall of the explosion-proof tube, a top block is inserted on the outer surface of the sealing block, a slider is fixedly connected to one end of the top block away from the sealing block, and a single lithium battery is arranged inside the box body.

[0007] Preferably, the fire extinguishing bag and the bottom plate are combined into a square, the inner wall of the box body is provided with a flame retardant cloth, and the flame retardant cloth is arranged between the fire extinguishing bag and the box body.

[0008] Preferably, the pipe opening is clamped inside the explosion-proof pipe, and the upper surface of the pipe opening is connected to the lower surface of the sealing block.

[0009] Preferably, the explosion-proof tube passes through the box cover, and a top cover is provided at the top end of the explosion-proof tube.

[0010] Preferably, a cavity is formed on the outer surface of the sealing block, the top block slides in the cavity, and a spring is disposed inside the cavity.

[0011] Preferably, the pressure relief port is connected to the interior of the box body, and the slider slides inside the pressure relief port.

[0012] Preferably, the box cover is snap-connected to the top end of the box body, and rivets are provided at the connection between the box cover and the box body.

[0013] The utility model has the following beneficial effects:

[0014] 1. By placing fire extinguishing bags and flame-retardant cloth inside the box, the high temperature generated by the failure of the lithium battery will melt the fire extinguishing bag, causing the internal fire extinguishing agent to flow out, cooling the lithium battery and extinguishing the fire. The flame-retardant cloth can further provide flame-retardant protection for the lithium battery;

[0015] 2. By setting an explosion-proof tube in the box cover, the high temperature generated by the failure of the lithium battery will cause the pressure inside the box to increase, which will then force the slider to slide from the pressure relief port into the explosion-proof tube, causing the pressure relief port to open, thereby eliminating the pressure inside the box and avoiding explosion caused by excessive pressure inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a lithium battery pack for an electric vehicle proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of a lithium battery pack for an electric vehicle proposed by the utility model;

[0018] Figure 3 This is a schematic diagram of the box cover structure of a lithium battery pack for an electric vehicle proposed by the utility model;

[0019] Figure 4 This is a schematic diagram of the explosion-proof tube structure of an electric vehicle lithium battery pack proposed by the utility model;

[0020] In the figure: 1. box body; 2. box cover; 3. rivet; 4. bottom plate; 5. fire extinguishing bag; 6. pipe mouth; 7. flame retardant cloth; 8. explosion-proof pipe; 9. top cover; 10. sealing block; 11. pressure relief port; 12. slider; 13. cavity; 14. top block; 15. spring; 16. single lithium battery. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1 and Figure 2 A lithium battery pack for electric vehicles includes a box body 1, a single lithium battery 16 is arranged inside the box body 1, a box cover 2 is clamped on the top of the box body 1, and a rivet 3 is arranged at the connection between the box cover 2 and the box body 1. The box body 1 and the box cover 2 are fixed by the rivet 3, which has good crack resistance and can resist the explosion and ejection of the lithium battery.

[0023] Reference Figure 1 , Figure 2 and Figure 3 The interior of the box body 1 is provided with a bottom plate 4, and a fire extinguishing bag 5 is arranged around the bottom plate 4. The fire extinguishing bag 5 is filled with a fire extinguishing agent. The upper surface of the fire extinguishing bag 5 is provided with a nozzle 6, and the fire extinguishing agent can be added from the nozzle 6. The fire extinguishing bag 5 and the bottom plate 4 are combined into a square. The inner wall of the box body 1 is provided with a flame retardant cloth 7, and the flame retardant cloth 7 is arranged between the fire extinguishing bag 5 and the box body 1, so as to further provide flame retardant protection for the lithium battery. The nozzle 6 is clamped in the interior of the explosion-proof pipe 8, and the upper surface of the nozzle 6 is connected to the lower surface of the sealing block 10 to seal the nozzle 6. When the lithium battery fails and generates high temperature, the high temperature will melt the fire extinguishing bag 5, so that the internal fire extinguishing agent flows out, the lithium battery is cooled and the fire is extinguished, and the reaction time of human processing is increased.

[0024] Reference Figure 1 , Figure 2 and Figure 4 , an explosion-proof pipe 8 is arranged in the middle part of the box cover 2, a pressure relief port 11 is provided on the outer surface of the explosion-proof pipe 8, a sealing block 10 is fixedly connected to the inner wall of the explosion-proof pipe 8, a top block 14 is interspersed on the outer surface of the sealing block 10, a slider 12 is fixedly connected to the end of the top block 14 away from the sealing block 10, the explosion-proof pipe 8 passes through the box cover 2, and a top cover 9 is arranged on the top of the explosion-proof pipe 8, which has a waterproof effect, a cavity 13 is provided on the outer surface of the sealing block 10, the top block 14 slides in the cavity 13, a spring 15 is arranged inside the cavity 13, and the spring 15 has a reset effect, the pressure relief port 11 is connected to the inside of the box body 1, and the slider 12 slides inside the pressure relief port 11. The increase in the internal temperature of the box body 1 will cause the pressure to increase, which will then compress and push the slider 12 to slide from the pressure relief port 11 into the inside of the explosion-proof pipe 8, so that the pressure relief port 11 is opened, and the box body 1 is connected with the outside through the explosion-proof pipe 8, which has the effect of eliminating the internal pressure of the box body 1.

[0025] The specific working principle of the utility model is as follows: a bottom plate 4 is arranged inside the box body 1, and a fire extinguishing bag 5 is arranged on the upper surface of the bottom plate 4. The fire extinguishing bag 5 and the bottom plate 4 wrap a single lithium battery 16 inside. A fire extinguishing agent can be added into the fire extinguishing bag 5 through a nozzle 6. When a lithium battery fails and generates high temperature, the high temperature will melt the fire extinguishing bag 5, so that the internal fire extinguishing agent flows out, and the lithium battery is cooled and extinguished. In addition, a flame retardant cloth 7 is arranged between the fire extinguishing bag 5 and the box body 1, which can further provide flame retardant protection for the lithium battery.

[0026] When closing the box cover 2, the explosion-proof tube 8 is clamped on the top of the tube mouth 6 to seal the tube mouth 6. If the lithium battery fails and generates high temperature, the temperature increase will cause the internal pressure of the box body 1 to increase, which will then compress and push the slider 12 to slide from the pressure relief port 11 into the explosion-proof tube 8. The movement of the slider 12 drives the top block 14 to squeeze the spring, so that the pressure relief port 11 opens and the top cover 9 is pushed open. The box body 1 is connected to the outside world through the explosion-proof tube 8, which eliminates the internal pressure of the box body 1 and avoids explosion caused by excessive internal pressure of the box body 1.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lithium battery pack for electric vehicles, comprising a box body (1) and a box cover (2), characterized in that: The box body (1) is provided with a bottom plate (4) inside, fire extinguishing bags (5) are arranged around the bottom plate (4), the upper surface of the fire extinguishing bag (5) is provided with a pipe opening (6), an explosion-proof tube (8) is arranged in the middle of the box cover (2), a pressure relief port (11) is opened on the outer surface of the explosion-proof tube (8), a sealing block (10) is fixedly connected to the inner wall of the explosion-proof tube (8), a top block (14) is inserted into the outer surface of the sealing block (10), and a slider (12) is fixedly connected to the end of the top block (14) away from the sealing block (10), and a single lithium battery (16) is arranged inside the box body (1).

2. The electric vehicle lithium battery pack according to claim 1, characterized in that: The fire extinguishing bag (5) and the bottom plate (4) are combined into a square shape, the inner wall of the box body (1) is provided with a flame retardant cloth (7), and the flame retardant cloth (7) is arranged between the fire extinguishing bag (5) and the box body (1).

3. The electric vehicle lithium battery pack according to claim 1, characterized in that: The pipe opening (6) is clamped inside the explosion-proof pipe (8), and the upper surface of the pipe opening (6) is connected to the lower surface of the sealing block (10).

4. The electric vehicle lithium battery pack according to claim 1, characterized in that: The explosion-proof tube (8) passes through the box cover (2), and a top cover (9) is provided at the top end of the explosion-proof tube (8).

5. The electric vehicle lithium battery pack according to claim 1, characterized in that: The outer surface of the sealing block (10) is provided with a cavity (13), the top block (14) slides in the cavity (13), and a spring (15) is arranged inside the cavity (13).

6. The electric vehicle lithium battery pack according to claim 1, characterized in that: The pressure relief port (11) is connected to the interior of the box body (1), and the sliding block (12) slides inside the pressure relief port (11).

7. The electric vehicle lithium battery pack according to claim 1, characterized in that: The box cover (2) is snap-connected to the top end of the box body (1), and a rivet (3) is provided at the connection between the box cover (2) and the box body (1).

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