Integrated pressure release valve and power battery

Abstract

The utility model is applicable to the technical field of power batteries, and particularly relates to an integrated pressure release valve and a power battery, which comprise a pressure release valve shell, a liquid injection pipe is arranged on the side surface of the pressure release valve shell, a gas release hole is arranged on the surface of the pressure release valve shell, a lower support block is connected inside the pressure release valve shell, and an upper support block is connected inside the pressure release valve shell. Second air holes are formed in the surface of the lower supporting block, an upper movable block is movably connected to the interior of the pressure release valve shell, and first air holes are formed in the surface of the upper movable block. According to the integrated pressure release valve, the liquid injection pipe and the temperature early warning device are integrated on the pressure release valve shell, so that the pressure release valve has the functions of electrolyte injection, air leakage and temperature monitoring at the same time, the installation mode is simple and stable, and therefore the practicability of the integrated pressure release valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to an integrated pressure relief valve and a power battery. Background Art

[0002] As the core component of electric vehicles and other electric devices, the safety and stability of power batteries are of vital importance. With the rapid development of the electric vehicle industry, the performance requirements for power batteries are also increasing, especially in terms of safety. Batteries generate heat during the charging and discharging process. If the heat is not properly managed, it may cause the battery temperature to be too high or even cause thermal runaway, which poses a serious threat to the safety of the battery and its users.

[0003] In traditional power battery systems, the pressure relief valve is an important safety device used to release gas when the internal pressure of the battery exceeds the safety threshold to prevent battery damage or explosion. However, these traditional pressure relief valves are usually installed on the battery module as independent components, which not only increases the volume and weight of the battery pack, but also increases the production cost and complexity. In view of this, the utility model provides an integrated pressure relief valve to solve the above technical problems. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide an integrated pressure relief valve and a power battery, aiming to solve the technical problems mentioned in the background technology.

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

[0006] An integrated pressure relief valve comprises a pressure relief valve housing, a liquid injection pipe is installed on the side of the pressure relief valve housing, a temperature early warning device installation hole is provided on the surface of the pressure relief valve housing, a temperature early warning device is installed inside the temperature early warning device installation hole, an air leakage hole is provided on the surface of the pressure relief valve housing, a lower support block is connected to the inside of the pressure relief valve housing, a second air vent is provided on the surface of the lower support block, an upper movable block is movably connected to the inside of the pressure relief valve housing, a first air vent is provided on the surface of the upper movable block, and a breathable diaphragm is provided inside the pressure relief valve housing;

[0007] A lifting assembly is arranged inside the pressure relief valve housing, and the lifting assembly is used to drive the upper movable block to move inside the pressure relief valve housing.

[0008] Furthermore, the outer side of the upper movable block is tightly attached to the inner wall of the pressure relief valve housing, and the first air vent provided on the upper movable block and the second air vent provided on the lower support block are staggered in design.

[0009] Furthermore, the air-permeable membrane is arranged between the lower support block and the upper movable block, and the surface of the air-permeable membrane is in close contact with the surface of the lower support block.

[0010] Furthermore, the lifting assembly includes:

[0011] A spring is installed inside the pressure relief valve housing, and two ends of the spring are respectively connected to the inner wall of the pressure relief valve housing and the surface of the upper movable block, and a blocking column is installed on the surface of the upper movable block away from the spring;

[0012] A first through hole is formed on the surface of the lower support block, and a second through hole is formed on the surface of the air-permeable membrane.

[0013] Furthermore, a conical cover is connected to the outer side of the lower support block, and a third through hole is opened on the surface of the conical cover, and a buffer cavity is formed between the conical cover and the lower support block.

[0014] Furthermore, the blocking column is sequentially arranged to penetrate the interior of the second through hole, the first through hole and the third through hole, and the outer diameter of the blocking column is the same as the inner diameter of the second through hole, the first through hole and the third through hole.

[0015] Furthermore, an arc-shaped opening is provided on the side of the pressure relief valve housing, a second arc-shaped groove is provided on the side of the upper movable block, a first arc-shaped groove is provided on the side of the lower support block, and the injection tube is installed inside the arc-shaped opening, the second arc-shaped groove and the first arc-shaped groove.

[0016] Furthermore, a mounting welding ring is commonly provided on the outer sides of the pressure relief valve housing and the injection pipe.

[0017] A power battery comprises the above-mentioned integrated pressure relief valve.

[0018] The utility model provides an integrated pressure relief valve and a power battery, which have the following beneficial effects:

[0019] 1. By integrating the liquid injection pipe into the pressure relief valve housing, the pressure relief valve can have the functions of filling electrolyte and releasing air at the same time, and the installation method is simple and stable, thereby improving the practicality of the integrated pressure relief valve.

[0020] 2. By setting the upper movable block, the breathable diaphragm, the lower support block, the blocking column and the lifting assembly, when the internal pressure of the bleed hole exceeds the limit value, the excess gas inside the bleed hole can be fully discharged, and in the discharge process, the electrolyte can be prevented from being discharged together with the gas, thereby avoiding leakage of the electrolyte, thereby improving the practicality of the integrated pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a front cross-sectional view of an integrated pressure relief valve.

[0022] Figure 2 It is a schematic diagram of the front three-dimensional structure of an integrated pressure relief valve.

[0023] Figure 3 It is a schematic diagram of the upward three-dimensional structure of an integrated pressure relief valve.

[0024] Figure 4 The present invention is a three-dimensional structural schematic diagram of an upper movable block, a spring, a blocking column and an injection pipe of an integrated pressure relief valve.

[0025] Figure 5 The present invention is a three-dimensional structural schematic diagram of an upper movable block, a spring and a blocking column of an integrated pressure relief valve.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the lower support block and the conical cover of an integrated pressure relief valve.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of a power battery equipped with an integrated pressure relief valve.

[0028] In the figure: 1. Pressure relief valve housing; 2. Liquid injection pipe; 3. Installation welding ring; 4. First air vent; 5. Second air vent; 6. Conical cover; 7. Blocking column; 8. Lower support block; 9. Breathable diaphragm; 10. Upper movable block; 11. Air vent; 12. Temperature warning device installation hole; 13. Spring; 14. Temperature warning device; 15. First through hole; 16. First arc-shaped groove; 17. Second arc-shaped groove; 18. Power battery. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0031] like Figure 1-Figure 6As shown, an integrated pressure relief valve provided by an embodiment of the utility model comprises a pressure relief valve housing 1, a liquid injection pipe 2 is installed on the side of the pressure relief valve housing 1, and a temperature early warning device installation hole 12 is provided on the surface of the pressure relief valve housing 1, and a temperature early warning device 14 is installed inside the temperature early warning device installation hole 12, and an air leakage hole 11 is provided on the surface of the pressure relief valve housing 1, and a lower support block 8 is connected to the inside of the pressure relief valve housing 1, and a second air vent 5 is provided on the surface of the lower support block 8, and an upper movable block 10 is movably connected to the inside of the pressure relief valve housing 1, and the outer side of the upper movable block 10 is tightly attached to the inner wall of the pressure relief valve housing 1, and a first air vent 4 is provided on the surface of the upper movable block 10, and a breathable diaphragm 9 is provided inside the pressure relief valve housing 1, and the breathable diaphragm 9 is arranged between the lower support block 8 and the upper movable block 10, and the breathable diaphragm 9 is a diaphragm with uniform thickness, which is used to block the outflow of liquid and only allow gas to pass through;

[0032] The surface of the breathable membrane 9 is closely attached to the surface of the lower support block 8, the number of the first breathable holes 4 and the number of the lower support block 8 are preferably 4, and the first breathable holes 4 opened on the upper movable block 10 and the second breathable holes 5 opened on the lower support block 8 are staggered;

[0033] A lifting assembly is provided inside the pressure relief valve housing 1, and the lifting assembly is used to drive the upper movable block 10 to move inside the pressure relief valve housing 1;

[0034] The jacking assembly includes:

[0035] A spring 13 is installed inside the pressure relief valve housing 1, and the two ends of the spring 13 are respectively connected to the inner wall of the pressure relief valve housing 1 and the surface of the upper movable block 10, and a blocking column 7 is installed on the surface of the upper movable block 10 away from the spring 13. Preferably, the deformation force of the spring corresponds to the pressure inside the battery, which affects the switching frequency of the two working states of the integrated pressure relief valve. The smaller the deformation force, the greater the switching frequency.

[0036] A first through hole 15 is provided on the surface of the lower support block 8, a second through hole is provided on the surface of the breathable diaphragm 9, a conical cover 6 is connected to the outer side of the lower support block 8, and a third through hole is provided on the surface of the conical cover 6, and a blocking column 7 is sequentially arranged through the interior of the second through hole, the first through hole 15 and the third through hole, and the outer diameter of the blocking column 7 is the same as the inner diameter of the second through hole, the first through hole 15 and the third through hole.

[0037] In one embodiment of the utility model, after the pressure relief valve housing 1 is fixedly mounted on the power battery 18, the electrolyte can be injected into the inside of the air leakage hole 11 through the injection pipe 2, and then a plugging piece is welded into the top opening of the injection pipe 2 to plug the injection pipe 2, and then the temperature alarm 14 is installed into the inside of the temperature alarm installation hole 12 to complete the installation operation of the entire pressure relief valve;

[0038] By integrating the liquid injection pipe 2 and the temperature alarm 14 into the pressure relief valve housing 1, the pressure relief valve can simultaneously have the functions of electrolyte injection, gas release and temperature monitoring, and the installation method is simple and stable, thereby improving the practicality of the integrated pressure relief valve;

[0039] The specific working principle of the integrated pressure relief valve is that when the internal pressure of the vent hole 11 exceeds the limit value, the high-pressure gas will lift the blocking column 7, so that the blocking column 7 moves inside the third through hole, the first through hole 15 and the second through hole, and the blocking column 7 will also drive the upper movable block 10 and the spring 13 to move together, thereby separating the upper movable block 10 from the air-permeable diaphragm 9 and the lower support block 8, that is, the second air-permeable hole 5 is no longer blocked by the upper movable block 10, and then the gas inside the vent hole 11 will pass through the third through hole, the first through hole 15 and the second through hole. The second vent hole 5 and the first vent hole 4 are discharged between the pressure relief valve housing 1 and the upper movable block 10, and the gas is also discharged through a plurality of vent holes 11 opened on the side surface of the pressure relief valve housing 1. It can be understood that when the gas enters the first vent hole 4 from the second vent hole 5, it will pass through the breathable diaphragm 9, so the electrolyte contained in the gas will be intercepted, and only the gas is allowed to be discharged. After the gas is discharged, the spring 13 returns to its original position, the entire pressure relief valve structure is closed, and the blocking column 7 is fully sealed and connected with the third through hole opened on the conical cover 6;

[0040] Through the above technical scheme, when the internal pressure of the air leak hole 11 exceeds the limit value, the excess gas inside the air leak hole 11 can be fully discharged, and during the discharge process, the electrolyte can be prevented from being discharged along with the gas, thereby avoiding leakage of the electrolyte, thereby improving the practicality of the integrated pressure relief valve.

[0041] When the pre-thermal runaway phenomenon occurs, the temperature inside the vent hole 11 increases, that is, the temperature of the gas also increases, and when the gas is discharged into the interior of the pressure relief valve housing 1, the temperature early warning device 14 installed inside the pressure relief valve housing 1 can sense the temperature of the gas, and then the temperature early warning device 14 issues a temperature warning to indicate that the battery temperature is too high and there is a safety risk. It is understandable that the real-time temperature of each vent hole 11 can also be controlled in real time through the temperature early warning device 14;

[0042] Through the above technical solution, a corresponding early warning mechanism can be developed for battery thermal runaway to extend the time before a battery accident occurs and reserve a lifeline for safe escape, which greatly improves the safety of the integrated pressure relief valve.

[0043] In this embodiment, a buffer cavity is formed between the conical cover 6 and the lower support block 8, so that when gas mixed with electrolyte enters the third through hole, the buffer cavity can receive the ejected electrolyte and make it flow back into the battery.

[0044] In this embodiment, an arc-shaped opening is provided on the side of the pressure relief valve housing 1, a second arc-shaped groove 17 is provided on the side of the upper movable block 10, and a first arc-shaped groove 16 is provided on the side of the lower support block 8. The injection tube 2 is installed inside the arc-shaped opening, the second arc-shaped groove 17 and the first arc-shaped groove 16, so that the entire integrated pressure relief valve can present a cylindrical structure, which not only improves the integrated beauty of the pressure relief valve, but also improves the convenience of installation of the pressure relief valve.

[0045] like Figure 7 As shown, a power battery includes the above-mentioned integrated pressure relief valve, and a mounting hole (i.e., the original electrolyte injection port) is opened on the upper surface of the power battery 18, and the outer diameter of the mounting hole is the same as the outer diameter of the pressure relief valve housing 1, and the outer sides of the pressure relief valve housing 1 and the injection tube 2 are jointly provided with a mounting welding ring 3. By first placing the pressure relief valve housing 1 into the mounting hole and then welding the mounting welding ring 3 to the power battery 18, the pressure relief valve structure of the present application can be stably installed on the power battery 18, and the pressure relief valve and the power battery 18 can maintain good sealing.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated pressure relief valve, comprising a pressure relief valve housing (1), characterized in that: A liquid injection pipe (2) is installed on the side of the pressure relief valve housing (1); The surface of the pressure relief valve housing (1) is provided with an air leakage hole (11); the interior of the pressure relief valve housing (1) is connected to a lower support block (8), and the surface of the lower support block (8) is provided with a second air vent (5); the interior of the pressure relief valve housing (1) is movably connected to an upper movable block (10), and the surface of the upper movable block (10) is provided with a first air vent (4); and the interior of the pressure relief valve housing (1) is provided with an air permeable diaphragm (9); A lifting assembly is arranged inside the pressure relief valve housing (1).

2. An integrated pressure relief valve according to claim 1, characterized in that: A temperature early warning device installation hole (12) is provided on the surface of the pressure relief valve housing (1), and a temperature early warning device (14) is installed inside the temperature early warning device installation hole (12).

3. The integrated pressure relief valve according to claim 1, characterized in that: The outer side of the upper movable block (10) is tightly attached to the inner wall of the pressure relief valve housing (1), and the first air vent (4) provided on the upper movable block (10) and the second air vent (5) provided on the lower support block (8) are staggered in design.

4. The integrated pressure relief valve according to claim 1, characterized in that: The air-permeable membrane (9) is arranged between the lower support block (8) and the upper movable block (10), and the surface of the air-permeable membrane (9) is in close contact with the surface of the lower support block (8).

5. The integrated pressure relief valve according to claim 1, characterized in that: The jacking assembly comprises: A spring (13) is installed inside the pressure relief valve housing (1), and two ends of the spring (13) are respectively connected to the inner wall of the pressure relief valve housing (1) and the surface of the upper movable block (10), and a blocking column (7) is installed on the surface of the upper movable block (10) away from the spring (13); A first through hole (15) is provided on the surface of the lower support block (8), and a second through hole is provided on the surface of the air-permeable membrane (9).

6. An integrated pressure relief valve according to claim 5, characterized in that: The outer side of the lower support block (8) is connected to a conical cover (6), and a third through hole is opened on the surface of the conical cover (6), and a buffer cavity is formed between the conical cover (6) and the lower support block (8).

7. An integrated pressure relief valve according to claim 6, characterized in that: The blocking column (7) is sequentially arranged to penetrate the interior of the second through hole, the first through hole (15) and the third through hole, and the outer diameter of the blocking column (7) is the same as the inner diameter of the second through hole, the first through hole (15) and the third through hole.

8. The integrated pressure relief valve according to claim 1, characterized in that: The side of the pressure relief valve housing (1) is provided with an arc-shaped opening, the side of the upper movable block (10) is provided with a second arc-shaped groove (17), the side of the lower support block (8) is provided with a first arc-shaped groove (16), and the injection pipe (2) is installed inside the arc-shaped opening, the second arc-shaped groove (17) and the first arc-shaped groove (16).

9. The integrated pressure relief valve according to claim 1, characterized in that: The outer sides of the pressure relief valve housing (1) and the liquid injection pipe (2) are jointly provided with a mounting welding ring (3).

10. A power battery, characterized in that: Comprising an integrated pressure relief valve as described in any one of claims 1 to 8.

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