Anti-bulging pressure release valve for battery pack

Abstract

The utility model discloses an anti-bulging pressure release valve for a battery pack, which comprises a valve body and a valve core arranged on the valve body in a sliding manner, the valve element comprises a sealing part and a sliding convex part arranged at the bottom of the sealing part, the valve body comprises an air inlet cavity and an air outlet cavity which are communicated with each other, the sealing part is arranged in the air outlet cavity, and the sliding convex part is inserted in the air inlet cavity; an elastic element is arranged in the air outlet cavity, one end of the elastic element abuts against the sliding convex part, and the other end of the elastic element abuts against the valve body, so that the valve element always has the movement tendency of being attached to the valve body; the valve element at least comprises a normal-pressure state and a pressure relief state, when the valve element is in the normal-pressure state, the pressure in the valve body is smaller than or equal to 1.5 kpa, the sealing part abuts against the valve body, when the valve element is in the pressure relief state, the pressure in the valve body is larger than or equal to 1.5 kpa, the sliding protruding part drives the sealing part to slide upwards, and the sealing part abuts against the valve body. And a pressure relief channel is formed between the air outlet cavity and the sealing part and is communicated with the air inlet cavity and the air outlet cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief valves, in particular to a battery pack anti-bulging pressure relief valve. Background Art

[0002] With the continuous expansion of the new energy vehicle market, power battery packs, as the core energy storage and supply devices of new energy vehicles, are attracting increasing attention from the public regarding their safety.

[0003] During use, existing battery packs generate a lot of heat inside the battery pack body, causing the gas inside the battery pack to expand. If the gas is not quickly exhausted and the pressure is not released, it is easy to cause the battery pack body to bulge. When the bulge reaches a certain level, it will cause it to explode, causing serious safety hazards. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a battery pack anti-bulging pressure relief valve.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A battery pack anti-bulging pressure relief valve, comprising a valve body and a valve core slidably arranged on the valve body;

[0007] The valve core includes a sealing portion and a sliding protrusion arranged at the bottom of the sealing portion. The valve body includes an air inlet cavity and an air outlet cavity that are connected. The sealing portion is placed in the air outlet cavity, and the sliding protrusion is inserted in the air inlet cavity.

[0008] An elastic element is provided in the air outlet cavity, one end of the elastic element abuts against the sliding protrusion, and the other end abuts against the valve body, so that the valve core always has a movement tendency toward the valve body;

[0009] The valve core at least includes a normal pressure state and a pressure relief state. When the valve core is in the normal pressure state, the pressure in the valve body is less than or equal to 1.5kPa, the sealing portion abuts the valve body, and when the valve core is in the pressure relief state, the pressure in the valve body is greater than or equal to 1.5kPa. The sliding protrusion drives the sealing portion to slide upward, so that a pressure relief channel is formed between the air outlet cavity and the sealing portion, and the air inlet cavity and the air outlet cavity are connected.

[0010] Preferably, the elastic element has a diameter of 0.8 mm, a height of 15 mm, and an elastic modulus of 1.75 N / M. Through the above improvements, the elastic element is used to control the bearing pressure, thereby precisely controlling the force required to open the valve core. When the gas inside the battery pack begins to expand, pressure is immediately released, thereby increasing the safety of the battery pack during use.

[0011] Preferably, the diameter of the pressure-bearing surface of the sliding protrusion is 40 mm. Through the above improvements, the diameter of the pressure-bearing surface of the sliding protrusion is used to control the force of the air pressure on the valve core, ensuring that the valve core rises under the specified action and releases pressure, accurately controlling the air pressure inside the valve body.

[0012] Preferably, a connecting block is threadedly connected to the bottom of the sliding protrusion, and one end of the elastic element abuts the valve body, and the other end abuts the connecting block. Through the above improvement, the connecting block cooperates with the elastic element, so that the entire valve core has a downward movement trend, so that it abuts the valve body under normal pressure and performs a seal.

[0013] Preferably, a rotating arc surface is formed on the outer periphery of the connecting block, and the rotating arc surface is in contact with the inner wall of the air inlet cavity. Through the above improvements, the convenience of installing the connecting block and the sliding protrusion is improved, and the rotating protrusion will rotate along the inner wall of the air inlet cavity, ensuring the convenience of installing the connecting block.

[0014] Preferably, a plurality of air inlets arranged at equal intervals are formed between the connecting block and the inner wall of the air inlet cavity. Through the above improvement, multiple air inlets are respectively fed with air and pressurize the valve core, thereby ensuring the accuracy of the valve core opening and the stability of the valve core during the upward sliding process.

[0015] Preferably, the material of the elastic element is spring steel. Through the above improvements, the service life of the elastic element is greatly increased to ensure the service life of the entire pressure relief valve.

[0016] Preferably, a first sealing groove is formed on the sealing portion, and a first sealing ring is disposed in the first sealing groove. When the valve core is in a normal pressure state, the first sealing ring abuts against the air outlet cavity. Through the above improvement, the abutment between the first sealing ring and the valve body ensures the sealing performance of the pressure relief valve in a closed state.

[0017] Preferably, a second sealing groove is formed on the valve body, and a second sealing ring is provided in the second sealing groove. Through the above improvements, the sealing performance of the mating part between the pressure relief valve and the battery pack is improved.

[0018] Preferably, the valve body is formed with an air inlet notch connecting the air inlet cavity and the air outlet cavity, and the sliding protrusion is slidably disposed on the air inlet notch, with a certain air flow gap formed between the sliding protrusion and the air inlet notch. Through the above improvement, the stability of the sliding protrusion during the upward and downward sliding process is ensured, and the air flow gap is used for pressure relief.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] By arranging a sealing portion and a sliding convex portion on the valve core, and arranging a communicating air inlet cavity and air outlet cavity on the valve body, the sealing portion is placed in the air outlet cavity, the sliding convex portion is inserted in the air inlet cavity, and an elastic element is arranged in the air outlet cavity, one end of the elastic element abuts the sliding convex portion, and the other end abuts the valve body, so that the valve core always has a movement tendency toward fitting the valve body, and the elastic element and the sliding convex portion cooperate to make the valve core slide under a limited pressure, so that the valve core has a normal pressure state and a pressure relief state. When the valve core is in the normal pressure state, the pressure in the valve body is less than or equal to 1.5kpa, and the sealing portion is placed in the air outlet cavity. When the pressure relief valve is in a closed state and the valve core is in a pressure relief state, the pressure in the valve body is greater than or equal to 1.5kPa, and the sliding convex portion drives the sealing portion to slide upward, so that a pressure relief channel is formed between the air outlet cavity and the sealing portion, and the air inlet cavity and the air outlet cavity are connected, thereby releasing pressure, filling the gap in the market and making it adaptable to ultra-low pressure environments. When the temperature of the battery pack rises and the gas inside the battery pack begins to expand, the pressure relief valve will immediately release pressure to reduce the internal air pressure of the battery pack, which not only improves the service life of the battery pack, but also greatly improves the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is an exploded view of the overall structure of the utility model;

[0023] Figure 3 It is a cross-sectional view of the overall structure of the utility model;

[0024] Figure 4 This is a structural diagram of the valve core of the utility model;

[0025] Figure 5 This is a schematic structural diagram of the valve body of the present utility model;

[0026] In the figure: 1. Valve body; 2. Valve core; 1.1. Sealing portion; 1.2. Sliding protrusion; 1.3. Air inlet cavity; 1.4. Air outlet cavity; 1.5. Elastic element; 1.6. Connecting block; 1.7. Rotating arc surface; 1.8. Air inlet; 2.1. First sealing groove; 2.2. First sealing ring; 2.3. Second sealing groove; 2.4. Second sealing ring; 2.5. Air inlet notch; 2.6. Air gap; 3.1. Fixing protrusion; 3.2. Connecting hole; 3.3. Connecting thread DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be understood that although terms such as upper, middle, lower, top, end, etc. appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for ease of understanding, and are not used to define any direction or order limitation.

[0029] like Figure 1-5 As shown, the battery pack anti-bulging pressure relief valve includes a valve body 1 and a valve core 2 slidably arranged on the valve body 1.

[0030] Specifically, the valve core 2 includes a sealing portion 1.1 and a sliding protrusion 1.2 arranged at the bottom of the sealing portion 1.1. The valve body 1 includes a connected air inlet cavity 1.3 and an air outlet cavity 1.4, and the sealing portion 1.1 is placed in the air outlet cavity 1.4, and the sliding protrusion 1.2 is inserted in the air inlet cavity 1.3.

[0031] Furthermore, an elastic element 1.5 is provided in the air outlet cavity 1.4. One end of the elastic element 1.5 abuts against the sliding protrusion 1.2, and the other end abuts against the valve body 1, so that the valve core 2 always has a movement tendency toward the valve body 1.

[0032] In addition, the valve core 2 includes at least a normal pressure state and a pressure relief state. When the valve core 2 is in the normal pressure state, the pressure in the valve body 1 is less than or equal to 1.5 kPa, and the sealing portion 1.1 abuts against the valve body 1. When the valve core 2 is in the pressure relief state, the pressure in the valve body 1 is greater than or equal to 1.5 kPa, and the sliding protrusion 1.2 drives the sealing portion 1.1 to slide upward, so that a pressure relief channel is formed between the air outlet cavity 1.4 and the sealing portion 1.1, and the air inlet cavity 1.3 and the air outlet cavity 1.4 are connected to relieve pressure.

[0033] By using the elastic element 1.5 and the sliding protrusion 1.2, the valve core 2 slides under a limited pressure to match the ultra-low pressure environment, filling the gap in the market. When the battery pack temperature rises and the gas inside the battery pack begins to expand, the pressure can be released immediately to avoid bulging of the battery pack, while greatly improving the safety of the battery pack during use.

[0034] Further explanation of the elastic element 1.5: The elastic element 1.5 has a diameter of 0.8 mm, a height of 15 mm, and an elastic coefficient of 1.75 N / M. The elastic element 1.5 is used to control the bearing capacity, thereby precisely controlling the force with which the valve core 2 opens. When the gas inside the battery pack begins to expand, the pressure is released immediately to increase user safety.

[0035] Furthermore, a connecting block 1.6 is threadedly connected to the bottom of the sliding protrusion 1.2, and one end of the elastic element 1.5 abuts the valve body 1, and the other end abuts the connecting block 1.6. The elastic element 1.5 applies a downward force to the connecting block 1.6, thereby causing the entire valve core 2 to have a downward movement tendency, so that it abuts the valve body 1 under normal pressure and performs sealing.

[0036] Preferably, a rotating arc surface 1.7 is formed on the outer periphery of the connecting block 1.6, and the rotating arc surface 1.7 fits against the inner wall of the air inlet cavity 1.3, thereby improving the convenience of the connecting block 1.6 and the sliding protrusion 1.2 during installation. The rotating protrusion will rotate along the inner wall of the air inlet cavity 1.3, ensuring the convenience of installation of the connecting block 1.6.

[0037] In addition, a number of air inlets 1.8 arranged at equal intervals are formed between the connecting block 1.6 and the inner wall of the air inlet cavity 1.3. The multiple air inlets 1.8 respectively take in air and apply pressure to the valve core 2, ensuring the accuracy of the opening of the valve core 2 and the stability of the valve core 2 during the upward sliding process.

[0038] As a further explanation of the sliding protrusion 1.2, the diameter of the pressure-bearing surface of the sliding protrusion 1.2 is 40 mm. The diameter of the pressure-bearing surface of the sliding protrusion 1.2 is used to control the force of the air pressure on the valve core 2, ensuring that the valve core 2 rises under the specified force and relieves pressure, thereby accurately controlling the air pressure inside the valve body 1.

[0039] Furthermore, an air inlet slot 2.5 connecting the air inlet chamber 1.3 and the air outlet chamber 1.4 is formed on the valve body 1. The sliding protrusion 1.2 is slidably arranged on the air inlet slot 2.5, and a certain air gap 2.6 is formed between the sliding protrusion 1.2 and the air inlet slot 2.5, thereby ensuring the stability of the sliding protrusion 1.2 during the up and down sliding process, and utilizing the air gap 2.6 for pressure relief.

[0040] During the pressure relief process, gas enters the gas gap 2.6 from the gas inlet cavity 1.3 and is discharged through the gas outlet cavity 1.4 to relieve the pressure and ensure the internal pressure of the battery.

[0041] Preferably, the material of the elastic element 1.5 is spring steel, which greatly increases the service life of the elastic element 1.5 to ensure the service life of the entire pressure relief valve.

[0042] Preferably, a first sealing groove 2.1 is formed on the sealing portion 1.1, and a first sealing ring 2.2 is provided in the first sealing groove 2.1. The first sealing ring 2.2 abuts against the valve body 1 to ensure the sealing of the pressure relief valve in a closed state.

[0043] Preferably, a second sealing groove 2.3 is formed on the valve body 1, and a second sealing ring 2.4 is provided in the second sealing groove 2.3 to increase the sealing performance of the mating portion between the pressure relief valve and the battery pack.

[0044] In some other embodiments, a fixing protrusion 3.1 extending toward both sides is formed on the valve body 1, a connecting hole 3.2 is formed on the fixing protrusion 3.1, and a connecting thread 3.3 is formed at the bottom of the valve body 1, thereby improving the convenience of connection.

[0045] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. The battery pack anti-bulging pressure relief valve is characterized by: It comprises a valve body (1) and a valve core (2) slidably arranged on the valve body (1); The valve core (2) comprises a sealing portion (1.1) and a sliding protrusion (1.2) arranged at the bottom of the sealing portion (1.1); the valve body (1) comprises an air inlet cavity (1.3) and an air outlet cavity (1.4) which are connected, and the sealing portion (1.1) is placed in the air outlet cavity (1.4), and the sliding protrusion (1.2) is inserted in the air inlet cavity (1.3); An elastic element (1.5) is provided in the air outlet cavity (1.4), one end of the elastic element (1.5) abuts against the sliding protrusion (1.2), and the other end abuts against the valve body (1), so that the valve core (2) always has a movement tendency toward the valve body (1); The valve core (2) includes at least a normal pressure state and a pressure relief state. When the valve core (2) is in the normal pressure state, the pressure in the valve body (1) is less than or equal to 1.5 kPa, and the sealing portion (1.1) abuts against the valve body (1). When the valve core (2) is in the pressure relief state, the pressure in the valve body (1) is greater than or equal to 1.5 kPa, and the sliding protrusion (1.2) drives the sealing portion (1.1) to slide upward, so that a pressure relief channel is formed between the air outlet cavity (1.4) and the sealing portion (1.1), and the air inlet cavity (1.3) and the air outlet cavity (1.4) are connected.

2. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: The elastic element (1.5) has a diameter of 0.8 mm and a height of 15 mm, and an elastic coefficient of 1.75 N / M.

3. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: The diameter of the pressure-bearing surface of the sliding protrusion (1.2) is 40 mm.

4. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: The bottom of the sliding protrusion (1.2) is threadedly connected to a connecting block (1.6); one end of the elastic element (1.5) abuts against the valve body (1), and the other end abuts against the connecting block (1.6).

5. The battery pack anti-bulging pressure relief valve according to claim 4, characterized in that: A rotating arc surface (1.7) is formed on the outer periphery of the connecting block (1.6), and the rotating arc surface (1.7) is in contact with the inner wall of the air inlet cavity (1.3).

6. The battery pack anti-bulging pressure relief valve according to claim 4, characterized in that: A plurality of air inlets (1.8) arranged at equal intervals are formed between the connecting block (1.6) and the inner wall of the air inlet cavity (1.3).

7. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: The material of the elastic element (1.5) is spring steel.

8. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: A first sealing groove (2.1) is formed on the sealing portion (1.1), a first sealing ring (2.2) is provided in the first sealing groove (2.1), and when the valve core (2) is in a normal pressure state, the first sealing ring (2.2) abuts against the air outlet cavity (1.4).

9. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: A second sealing groove (2.3) is formed on the valve body (1), and a second sealing ring (2.4) is provided in the second sealing groove (2.3).

10. The battery pack anti-bulging pressure relief valve according to claim 1, characterized in that: The valve body (1) is provided with a connecting An air inlet slot (2.5) is connected to the air inlet cavity (1.3) and the air outlet cavity (1.4), and the sliding protrusion (1.2) is slidably arranged on the air inlet slot (2.5). A certain air gap (2.6) is formed between the sliding protrusion (1.2) and the air inlet notch (2.5).

Images