Exhaust valve and soft package battery

Abstract

The utility model belongs to the technical field of valves, and discloses an exhaust valve and a soft package battery. The exhaust valve comprises a first cavity part and a second cavity part; wherein a plurality of boss parts which are arranged in a staggered mode are arranged in the second cavity part, an air flow channel is formed among the boss parts, and the air flow channel is communicated with the first cavity part. The exhaust valve can prevent an airflow channel in the exhaust valve from being blocked, smooth exhaust of the gas production equipment is achieved, the internal pressure of the gas production equipment is prevented from being excessively increased, and the safety of the gas production equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to an exhaust valve and a soft-pack battery. Background Art

[0002] Existing gas-producing devices (such as soft-pack batteries) generally discharge the excess gas inside through the method of punching holes for exhaust. First, holes are punched in the gas-producing device, and flexible exhaust pipes are installed at the punched positions, and the gas is discharged through the exhaust pipes. However, this method is difficult to operate, and it is not easy to control the size of the holes, which is likely to cause damage to the gas-producing device. During the encapsulation process of the gas-producing device, the exhaust pipes will be squeezed and deformed, resulting in blockage of the exhaust pipes and affecting the normal exhaust of the exhaust pipes. Summary of the Utility Model

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an exhaust valve, a soft-pack battery and an electrical equipment.

[0004] In the first aspect of the present utility model, an exhaust valve is provided, including: a first cavity part and a second cavity part; wherein, a plurality of staggered boss parts are arranged inside the second cavity part, and an air flow channel is formed between the plurality of boss parts, and the air flow channel is communicated with the first cavity part.

[0005] According to the exhaust valve provided by the present utility model, the structure is simple. By using the staggered boss parts inside the second cavity part, the air flow channel inside is prevented from being blocked, the smooth exhaust of the gas-producing device is realized, the internal pressure of the gas-producing device is prevented from rising excessively, and the safety of the gas-producing device is improved.

[0006] In addition, the exhaust valve of the present utility model may also have the following additional technical features:

[0007] Preferably, the second cavity part includes a first side wall and a second side wall arranged oppositely, part of the boss parts are arranged on the first side wall, and the remaining boss parts are arranged on the second side wall, and the boss parts on the first side wall and the boss parts on the second side wall are staggered.

[0008] Preferably, at least part of the plurality of boss parts on the same side wall are arranged at equal intervals in the same direction.

[0009] Preferably, a recessed part is formed between two adjacent boss parts on the same side wall, and the width of the boss part is smaller than the width of the recessed part.

[0010] Preferably, a heat-sealing layer is arranged outside the second cavity part, and both sides of the heat-sealing layer extend outward from the side wall of the second cavity part.

[0011] Preferably, a sealing part is arranged at one end of the first cavity part away from the second cavity part.

[0012] Preferably, a third cavity portion is provided at one end of the second cavity portion away from the first cavity portion, and the third cavity portion is communicated with the air flow channel.

[0013] Preferably, the second cavity portion is integrally formed or separately provided with the first cavity portion and / or the third cavity portion.

[0014] In a second aspect of the present invention, a soft-pack battery is provided. The soft-pack battery includes an electric core, a film layer is coated on the surface of the electric core, an exhaust hole is formed in the film layer, and an exhaust valve according to any embodiment of the present application is installed at the exhaust hole. A heat-sealing layer is provided outside the second cavity portion of the exhaust valve, and the installation of the exhaust valve is realized by sealing connection between the film layer and the heat-sealing layer.

[0015] Preferably, the second cavity portion is located in the exhaust hole and is hermetically connected to the film layer through the heat-sealing layer, and the first cavity portion is located outside the exhaust hole and extends away from the electric core.

[0016] Preferably, h1≥h2, where h1 is the height of the second cavity portion and h2 is the height of the sealing area when the film layer is hermetically connected to the heat-sealing layer.

[0017] Preferably, the length of the first cavity portion protruding outside the film layer is 2 mm - 30 mm.

[0018] In a third aspect of the present invention, an electrical device is provided. The electrical device includes the soft-pack battery according to any embodiment of the present application.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present application will become more obvious:

[0021] Figure 1 It is a three-dimensional structure diagram of the exhaust valve provided by an embodiment of the present application;

[0022] Figure 2 It is a cross-sectional view of the exhaust valve provided by an embodiment of the present application;

[0023] Figure 3 It is a cross-sectional view of the second cavity portion provided by an embodiment of the present application;

[0024] Figure 4Structural diagram of the sealing part of the first cavity part provided by the embodiment of the present application;

[0025] Figure 5 Structural diagram of the soft-pack battery provided by the embodiment of the present application.

[0026] In the above figures:

[0027] 100 Exhaust valve; 110 First cavity part; 111 Sealing part; 120 Second cavity part; 121 Boss part; 122 Concave part; 123 Heat-sealing layer; 130 Third cavity part;

[0028] 200 Soft-pack battery; 210 Electric core; 220 Film layer; 230 Positive electrode tab; 240 Negative electrode tab. Detailed implementation manners

[0029] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. Additionally, it should be noted that for the sake of description, only the parts related to the utility model are shown in the drawings.

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0031] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0032] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is interpreted as open and inclusive, that is, "including, but not limited to".

[0033] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples", etc., are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] As the capacity of gas-producing devices such as soft-pack batteries increases, it is necessary to face the increasingly serious gas production problems inside them. As the amount of gas produced inside the soft-pack battery increases, it will gradually cause bulging and deformation, and the internal air pressure will be too high and explode. Generally, the excess gas inside the soft-pack battery is discharged by the method of punching holes and exhausting. First, the soft-pack battery is punched, and a flexible exhaust pipe is installed at the punched position, and the gas is discharged through the exhaust pipe. However, this method is difficult to operate, and it is not easy to control the size of the hole, and it is easy to cause irreparable damage to the aluminum-plastic film of the soft-pack battery. After punching and exhausting the soft-pack battery multiple times, multiple exhaust pipes will remain on the soft-pack battery, and the exhaust pipes will be deformed during thermocompression sealing with the aluminum-plastic film, resulting in blockage of the exhaust pipes and affecting the normal exhaust of the exhaust pipes.

[0036] To solve the above technical problems, as Figures 1 to 4 shown, in the first aspect of the present utility model, an exhaust valve 100 is provided, including: a first cavity part 110 and a second cavity part 120; wherein, a plurality of staggered boss parts 121 are arranged inside the second cavity part 120, and an air flow channel is formed between the plurality of boss parts 121, and the air flow channel is communicated with the first cavity part 110.

[0037] Specifically, both the first cavity part 110 and the second cavity part 120 are flexible tubes with a hollow structure, such as PP (polypropylene) hoses. Among them, a plurality of staggered boss parts 121 are fixedly arranged inside the second cavity part 120, and an air flow channel extending from the second cavity part 120 to the first cavity part 110 is formed between the plurality of boss parts 121, and this air flow channel is communicated with the inside of the first cavity. The staggered boss parts 121 inside the second cavity part 120 can support each other and provide favorable support for the second cavity part 120, ensuring that the air flow channel inside the second cavity part 120 remains unobstructed when the second cavity part 120 deforms, so that the exhaust valve 100 can exhaust smoothly. Among them, the boss part 121 can be a rod-shaped protrusion or the like.

[0038] According to the exhaust valve 100 provided by the present utility model, the structure is simple, and it can realize the timely exhaust of gas-producing devices such as soft-pack batteries 200, etc., avoid excessive increase in the internal pressure of the gas-producing device, improve the safety of the gas-producing device, and utilize the boss parts 121 arranged inside the second cavity part 120 to avoid blockage of the air flow channel inside it, ensuring the smooth exhaust of the exhaust valve 100.

[0039] In some embodiments, such as Figures 1 to 3 shown, the second cavity portion 120 includes a first side wall and a second side wall which are oppositely arranged, a part of the boss portion 121 is arranged on the first side wall, and the remaining part of the boss portion 121 is arranged on the second side wall, and the boss portion 121 on the first side wall and the boss portion 121 on the second side wall are arranged in an interleaved manner.

[0040] Specifically, the second cavity portion 120 has a first side wall and a second side wall which are oppositely arranged in a first direction, and the first direction is perpendicular to the exhaust direction of the exhaust valve 100; wherein, a plurality of boss portions 121 are arranged on the first side wall, and a plurality of boss portions 121 are also arranged on the second side wall, and the boss portion 121 on the first side wall and the boss portion 121 on the second side wall are arranged in an interleaved manner to form an air flow channel. Among them, the boss portion 121 on the first side wall and the boss portion 121 on the second side wall both extend along the exhaust direction, and the boss portion 121 on the first side wall is perpendicular to the first side wall, and the boss portion 121 on the second side wall is perpendicular to the second side wall. It should be noted that when the boss portion 121 on the first side wall and the boss portion 121 on the second side wall extend along the exhaust direction, a plurality of them can also be arranged in an array, that is, when the boss portion 121 extends along the exhaust direction, it does not extend integrally and can extend with partitions.

[0041] In this example, the interleaved boss portions 121 provide strong support for the second cavity portion 120, ensuring that the air flow channel is not blocked during the deformation process of the second cavity portion 120 and ensuring the smooth exhaust of the gas-producing device.

[0042] In some embodiments, at least some of the plurality of boss portions 121 on the same side wall are arranged at equal intervals in the same direction.

[0043] Specifically, as Figure 3 shown, the plurality of boss portions 121 on the first side wall are arranged at equal intervals in a second direction, the plurality of boss portions 121 on the second side wall are arranged at equal intervals in the second direction, and the boss portion 121 on the first side wall and the boss portion 121 on the second side wall are arranged in an interleaved manner in sequence. Among them, the second direction is perpendicular to the first direction and the exhaust direction of the exhaust valve 100 respectively.

[0044] Alternatively, some of the plurality of boss portions 121 on the first side wall are arranged at equal intervals in the second direction, and some are arranged at unequal intervals; some of the plurality of boss portions 121 on the second side wall are arranged at equal intervals in the second direction, and some are arranged at unequal intervals, and the boss portion 121 on the first side wall and the boss portion 121 on the second side wall are arranged in an interleaved manner.

[0045] In some embodiments, such asFigure 3 As shown, a recessed portion 122 is formed between two adjacent boss portions 121 on the same side wall. In the second direction, the width of the boss portion 121 is smaller than the width of the recessed portion 122.

[0046] Specifically, a recessed portion 122 is formed between any two adjacent boss portions 121 on the same side wall. The width of the boss portion 121 in the second direction is smaller than the width of the recessed portion 122 in the second direction. When the second cavity portion 120 is pressed and deformed, the boss portion 121 can be received in the recessed portion 122, avoiding the blockage of the air flow channel and ensuring the smooth exhaust of the exhaust valve 100.

[0047] In some embodiments, as Figures 1 to 4 shown, a heat-sealing layer 123 is provided outside the second cavity portion 120, and both sides of the heat-sealing layer 123 extend outward from the side wall of the second cavity portion 120.

[0048] Specifically, a heat-sealing layer 123 is provided around the outer surface of the second cavity portion 120, and the two sides of the heat-sealing layer 123 extend outward in the second direction to form lug structures. The heat-sealing layer 123 can be melted under the action of hot pressing, facilitating the hot-press melting seal between the gas-producing device and the exhaust valve 100. Exemplarily, for the soft-pack battery 200, the heat-sealing layer 123 outside the second cavity portion 120 of the exhaust valve 100 is hot-press melted and connected to the aluminum-plastic film of the soft-pack battery 200 to ensure the encapsulation effect of the soft-pack battery 200. Among them, the heat-sealing layer 123 can be formed by hot melt adhesive.

[0049] In some embodiments, as Figure 4 shown, a sealing portion 111 is provided at one end of the first cavity portion 110 away from the second cavity portion 120.

[0050] Specifically, a sealing portion 111 is provided at one end of the first cavity portion 110 away from the second cavity portion 120. When the gas-producing device does not need to exhaust gas, the air flow channel forms a closed channel to ensure the sealing performance of the gas-producing device. Among them, the sealing portion 111 is formed by heat melting the first cavity portion 110. The first cavity portion 110 is closed by heat melting to form the sealing portion 111, and the first cavity portion 110 is opened by cutting. Therefore, the exhaust valve 100 provided by the embodiments of the present application can be repeatedly opened or closed, improving the repeated use rate of the exhaust valve 100 and ensuring the safety of the gas-producing device.

[0051] In some embodiments, as Figure 1 and Figure 2 shown, a third cavity portion 130 is provided at one end of the second cavity portion 120 away from the first cavity portion 110, and the third cavity portion 130 is communicated with the air flow channel.

[0052] Specifically, the third cavity portion 130 is a flexible tube with a hollow structure. The first cavity portion 110, the second cavity portion 120, and the third cavity portion 130 are sequentially connected and arranged to ensure the smooth exhaust of the exhaust pipe. Among them, for the soft-pack battery 200, the third cavity portion 130 can penetrate through the aluminum-plastic film and extend into the interior of the soft-pack battery 200. The second cavity portion 120 is hermetically connected to the aluminum-plastic film, and the first cavity portion 110 is arranged outside the aluminum-plastic film. The third cavity portion 130 connected to the interior of the soft-pack battery 200 can discharge the excess gas inside the soft-pack battery 200 through the second cavity portion 120 and the first cavity portion 110, avoiding excessive pressure increase in the soft-pack battery 200. Moreover, the boss portion 121 provided inside the second cavity portion 120 can provide favorable support for the second cavity portion 120, avoiding the blockage of the air flow channel caused when the second cavity portion 120 is encapsulated with the aluminum-plastic film.

[0053] In some embodiments, the second cavity portion 120 and the first cavity portion 110 and / or the third cavity portion 130 are integrally formed or separately arranged.

[0054] Specifically, the second cavity portion 120 and the first cavity portion 110 are integrally formed, or the second cavity portion 120 and the third cavity portion 130 are integrally formed, or the second cavity portion 120, the first cavity portion 110, and the third cavity portion 130 can be integrally formed. The processing is convenient, the cost is low, and the overall structure of the exhaust valve 100 is firm and the sealing performance is strong.

[0055] The second cavity portion 120 and the first cavity portion 110 are separately arranged, or the second cavity portion 120 and the third cavity portion 130 are separately arranged, or the second cavity portion 120, the first cavity portion 110, and the third cavity portion 130 are separately arranged, and are formed by means such as welding and injection molding. Those skilled in the art can select the processing method of the first cavity portion 110, the second cavity portion 120, and the third cavity portion 130 according to actual needs, and the embodiments of the present application do not make special limitations.

[0056] In the second aspect of the present invention, as Figure 5 shown, a soft-pack battery 200 is provided. The soft-pack battery 200 includes an electric core 210, and a film layer 220 is coated on the surface of the electric core 210. An exhaust hole is provided in the film layer 220, and the exhaust valve 100 according to any embodiment of the present application is installed at the exhaust hole. A heat-sealing layer 123 is provided outside the second cavity portion 120 of the exhaust valve 100, and the exhaust valve 100 is installed by hermetically connecting the film layer 220 and the heat-sealing layer 123.

[0057] Specifically, the pouch cell 200 can be a pouch lithium-ion battery. The pouch cell 200 includes a battery cell 210 and a film layer 220 covering the outer surface of the battery cell 210. The film layer 220 can be an aluminum-plastic film. An exhaust hole is formed in the aluminum-plastic film, and the exhaust valve 100 is installed at the exhaust hole. Moreover, a heat-sealing layer 123 provided outside the second cavity portion 120 is hermetically connected to the film layer 223 to achieve the installation of the exhaust valve 100. Excess gas inside the pouch cell 200 can be discharged through the exhaust valve 100, avoiding excessive increase in the internal pressure of the pouch cell 200 and improving the safety of the pouch cell 200. A boss portion 121 provided inside the second cavity portion 120 provides favorable support for the second cavity portion 120, ensuring that the internal air flow channel can still remain unobstructed when the second cavity portion 120 deforms, enabling the exhaust valve 100 to exhaust gas smoothly.

[0058] It should be noted that the exhaust hole formed in the film layer 220 can be located on the side where the tabs of the pouch cell 200 are located. For example, it is located between the positive tab 230 and the negative tab 240. In this way, while the tabs are heat-sealed to the aluminum-plastic film, the exhaust valve 100 can be heat-sealed at the same time, which not only saves space but also simplifies the process flow. In addition, liquid such as an electrolyte solution can be injected into the pouch cell 200 through this exhaust hole.

[0059] It can be understood that the specific technical features and technical effects of the pouch cell 200 are consistent with the technical features and technical effects of the exhaust valve 100 described in any embodiment of the present application, and will not be elaborated in the embodiments of the present application.

[0060] In some embodiments, the second cavity portion 120 is located within the exhaust hole and is hermetically connected to the film layer 220 through the heat-sealing layer 123, and the first cavity portion 110 is located outside the exhaust hole and extends away from the battery cell 210.

[0061] Specifically, the second cavity portion 120 is located within the exhaust hole, and the heat-sealing layer 123 outside the second cavity portion 120 is hermetically connected to the film layer 220 by hot-pressing and melting. The first cavity portion 110 is located outside the exhaust hole and extends away from the battery cell 210. Through the cooperation of the first cavity portion 110 and the second cavity portion 120, the communication between the inside and the outside of the pouch cell 200 is realized, and then the excess gas inside the pouch cell 200 is discharged.

[0062] It should be noted that the third cavity portion 130 passes through the exhaust hole of the film layer 220 and extends into the pouch cell 200 to have a clearance fit with the battery cell 210. The gas generated by the battery cell 210 is encapsulated in the aluminum-plastic film. Through the cooperation of the third cavity portion 130, the second cavity portion 120, and the first cavity portion 110, the excess gas in the aluminum-plastic film can be discharged, improving the safety of the pouch cell 200.

[0063] In some embodiments, as Figure 2 and Figure 5 shown, h1≥h2, where h1 is the height of the second cavity portion 120, and h2 is the height of the sealing area when the film layer 220 is hermetically connected to the thermal fusion sealing layer 123.

[0064] Specifically, the height of the second cavity portion 120 along the exhaust direction is h1. When the film layer 220 is hermetically connected to the thermal fusion sealing layer 123, a sealing area is formed, and the height of the sealing area along the exhaust direction is h2. h1≥h2. When the thermal fusion sealing layer 123 outside the second cavity portion 120 is hermetically connected to the film layer such as an aluminum-plastic film, it is avoided that the aluminum-plastic film is encapsulated to the position of the first cavity portion 110 or / and the third cavity portion 130, ensuring the encapsulation effect of the exhaust valve 100 on the soft-pack battery 200.

[0065] In some embodiments, the length by which the first cavity portion 110 protrudes outside the film layer 220 is 2 mm - 30 mm.

[0066] Specifically, the length by which the first cavity portion 110 protrudes outside the film layer 220 along the exhaust direction is 2 mm - 30 mm. Exemplarily, such as 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, etc., or a range composed of any of the above values. If the length by which the first cavity portion 110 protrudes outside the film layer 220 is less than 2 mm, the length is too short, which is not conducive to the thermal fusion of the first cavity portion 110 to form the sealing portion 111 and the cutting of the first cavity portion 110; if the length is greater than 30 mm, the length is too long, affecting the assembly of the soft-pack battery 200.

[0067] In this example, the first cavity portion 110 protrudes outside the film layer 220 and extends along the side away from the battery cell 210, which can enable the first cavity portion 110 to be reused by thermal fusion and cutting, improving the utilization rate of the exhaust valve 100. Exemplarily, such as the end of the first cavity portion 110 away from the second cavity portion 120 forms a sealing portion 111 by thermal fusion, ensuring the sealing performance of the soft-pack battery 200; the exhaust valve 100 is opened by cutting, ensuring the exhaust performance of the exhaust valve 100. It should be noted that the strength of the sealing portion 111 is less than the sealing strength of the film layer 220 such as an aluminum-plastic film. When the pressure inside the soft-pack battery 200 is too high, the sealing portion 111 can be preferentially broken through to exhaust in time.

[0068] In the third aspect of the present invention, there is provided an electrical device, which includes the exhaust valve 100 according to any embodiment of the present application, or includes the soft-pack battery 200 according to any embodiment of the present application.

[0069] Specifically, the specific technical features and technical effects of the electrical device are consistent with those of the exhaust valve 100 and the soft-pack battery 200 described in any embodiment of the present application, and will not be elaborated in the embodiments of the present application.

[0070] It should be noted that the electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a power planer, etc. The embodiments of the present invention do not impose special restrictions on the above electrical devices.

[0071] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept of the utility model. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An exhaust valve (100), characterized in that, Comprising: A first cavity portion (110) and a second cavity portion (120); wherein, a plurality of staggered boss portions (121) are arranged inside the second cavity portion (120), and an air flow channel is formed between the plurality of boss portions (121), and the air flow channel is communicated with the first cavity portion (110).

2. The exhaust valve (100) according to claim 1, characterized in that, The second cavity portion (120) includes a first side wall and a second side wall which are oppositely arranged, a part of the boss portions (121) are arranged on the first side wall, and the remaining part of the boss portions (121) are arranged on the second side wall, and the boss portions (121) on the first side wall and the boss portions (121) on the second side wall are staggered.

3. The exhaust valve (100) according to claim 2, characterized in that, At least some of the plurality of boss portions (121) on the same side wall are arranged at equal intervals in the same direction.

4. The exhaust valve (100) according to claim 2, wherein, A recessed portion (122) is formed between two adjacent boss portions (121) on the same side wall, and the width of the boss portion (121) is smaller than the width of the recessed portion (122).

5. The exhaust valve (100) according to claim 1, characterized in that, A sealing portion (111) is arranged at one end of the first cavity portion (110) away from the second cavity portion (120).

6. The exhaust valve (100) according to any one of claims 1-5, characterized in that, A third cavity portion (130) is arranged at one end of the second cavity portion (120) away from the first cavity portion (110), and the third cavity portion (130) is communicated with the air flow channel.

7. A soft-pack battery (200), characterized in that, The soft-pack battery (200) includes an electric core (210), a film layer (220) is coated on the surface of the electric core (210), an exhaust hole is formed in the film layer (220), and an exhaust valve (100) according to any one of claims 1-6 is installed at the exhaust hole. A thermal fusion sealing layer (123) is arranged outside the second cavity portion (120) of the exhaust valve (100), and the exhaust valve (100) is installed by sealing connection between the film layer (220) and the thermal fusion sealing layer (123).

8. The soft-pack battery (200) according to claim 7, characterized in that, The second cavity portion (120) is located inside the exhaust hole and is hermetically connected to the film layer (220) through the thermal fusion sealing layer (123), and the first cavity portion (110) is located outside the exhaust hole and extends away from the electric core (210).

9. The soft-pack battery (200) according to claim 7, wherein h1≥h2, where h1 is the height of the second cavity portion (120), and h2 is the height of the sealing area when the film layer (220) is hermetically connected to the thermal fusion sealing layer (123).

10. The soft-pack battery (200) according to claim 7, characterized in that, The length of the first cavity portion (110) protruding outside the film layer (220) is 2 mm - 30 mm.

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