Exhaust valve and battery cover plate assembly

Abstract

The exhaust valve comprises a valve body, a sealing piece, a limiting piece and an elastic piece, the valve body comprises a hollow cavity, and a first opening and a second opening which are communicated with the hollow cavity are formed in the two ends of the valve body in the axial direction respectively; the first opening is used for being communicated with outside air, and the second opening is used for being communicated with a gas release opening of gas production equipment; a sealing piece, a limiting piece and an elastic piece are sequentially arranged at the second opening in the valve body, the sealing piece is provided with a via hole, and the first opening, the hollow cavity, the via hole and the air release opening are communicated to form an exhaust channel; the exhaust valve has a first sealing state and a second exhaust state, and in the first state, the limiting piece is in sealing fit with the sealing piece under the elastic force action of the elastic piece; in the second state, the elastic piece is compressed and deformed, and the limiting piece is in clearance fit with the sealing piece. The exhaust valve can realize automatic exhaust of gas and ensure the safety of gas production equipment.

Description

Technical Field

[0001] This utility model belongs to the field of secondary battery safety technology, specifically relating to an exhaust valve and battery cover assembly. Background Technology

[0002] The demand and capacity of rechargeable batteries are increasing daily, leading to a growing problem of gas generation within them. As the amount of gas generated inside rechargeable batteries increases, if it cannot be released in time, it will gradually cause the batteries to swell and deform, and in severe cases, excessive internal pressure may lead to an explosion.

[0003] To address the issue of internal gas generation in secondary batteries, an explosion-proof valve is typically installed on the battery cover assembly. When the internal thermal runaway gas pressure reaches a certain threshold, the explosion-proof valve ruptures, creating a vent on the top cover to release pressure and prevent an explosion due to excessive internal pressure. However, the explosion-proof valve primarily functions when there is a large amount of gas generated inside the secondary battery. It cannot solve problems such as bulging, deformation, and increased pressure caused by slow or small amounts of gas generation. Furthermore, the explosion-proof valve is a disposable component; its activation can damage the battery structure. Therefore, its limitations are significant, and it still affects the safety of the secondary battery. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an exhaust valve, a battery cover assembly, a battery, and an electrical device.

[0005] A first aspect of this utility model provides an exhaust valve, comprising:

[0006] The valve body includes a hollow cavity. A first opening and a second opening are respectively provided at both ends of the valve body along the axial direction. The first opening and the second opening are connected to the hollow cavity. The first opening is for communication with outside air, and the second opening is for communication with the vent of the gas generating equipment.

[0007] A sealing element is disposed inside the valve body at the second opening. The sealing element is provided with a through hole. The first opening, the hollow cavity, the through hole and the vent are connected to form an exhaust channel.

[0008] A limiting member is disposed inside the valve body and on the side of the seal away from the second opening;

[0009] An elastic element is disposed inside the valve body and between the first opening and the limiting element;

[0010] The exhaust valve has a first sealed state and a second exhaust state. In the first state, under the elastic force of the elastic member, the limiting member and the sealing member are sealed together, so that the through hole is in a closed state. In the second state, the elastic member is compressed and deformed, and the limiting member and the sealing member are in a clearance fit, so that the through hole is in a communicating state with the hollow cavity.

[0011] The exhaust valve provided by this utility model has a simple structure. It can ensure that the internal pressure of the gas generating equipment does not rise excessively when the gas generating equipment is slowly producing gas, avoiding the bulging and deformation problems caused by the small amount of gas produced by the gas generating equipment. Moreover, the exhaust method is gentle and will not damage the structure of the gas generating equipment. It can also ensure that the liquid is not discharged during exhaust, avoiding serious corrosion to the surrounding environment and equipment, improving the safety of the gas generating equipment, and ensuring the performance of the gas generating equipment.

[0012] Preferably, the through hole extends through the seal along the axial direction of the valve body, and the limiting member includes a boss on the side near the seal. In the first state, the boss extends at least partially into the through hole of the seal along the axial direction of the valve body.

[0013] Preferably, along the axial direction of the valve body, the ratio of the height of the boss located in the through hole to the height of the through hole is in the range of 1 / 4 to 1 / 2.

[0014] Preferably, the limiting member further includes a limiting groove on the side away from the sealing member, and the elastic member is assembled into the limiting groove to limit the elastic member.

[0015] Preferably, the limiting member includes a side wall plate and a bottom wall plate, the bottom end of the side wall plate is fixed to the bottom wall plate, the side wall plate and the bottom wall plate surround to form the limiting groove, and the elastic member is in a stop-fitting engagement with the bottom wall plate; a portion of the bottom wall plate protrudes toward the sealing member to form the boss.

[0016] Preferably, the axes of the first opening, the second opening, and the vent are arranged collinearly.

[0017] Preferably, the valve body includes a first sidewall, the top of which extends along an axial direction perpendicular to the valve body and toward the hollow cavity to form a first top wall. The first opening is formed on the first top wall, and in the first state and the second state, the elastic element is engaged with the first top wall; or,

[0018] The top of the first sidewall extends along an axis perpendicular to the valve body and toward a direction away from the hollow cavity, forming a first top wall, and the first opening is formed on the first top wall.

[0019] Preferably, the valve body includes a first sidewall, the bottom of the first sidewall extends along an axis perpendicular to the valve body and toward the hollow cavity to form a first bottom wall, and the second opening is formed on the first bottom wall. In the first state, the sealing element is in sealing fit with the first bottom wall, and in the second state, the sealing element is in clearance fit with the first bottom wall.

[0020] Alternatively, the bottom of the first sidewall is an open end, which forms the second opening.

[0021] Preferably, when the elastic element is engaged with the first top wall, the width of the elastic element along the axial direction perpendicular to the valve body is greater than the maximum diameter of the first opening.

[0022] A second aspect of this utility model provides a battery cover assembly, including a cover body, a vent on the cover body, and an exhaust valve as described in any embodiment of this application at the vent.

[0023] Preferably, the cover plate body is provided with an injection hole for injecting electrolyte into the battery, the injection hole forms the vent, the valve body is fixedly connected to the cover plate body, and the second opening of the valve body is connected to the injection hole;

[0024] Alternatively, the cover plate body is provided with a pole post, the pole post including a positive pole post and / or a negative pole post, the pole post having a receiving groove, the valve body being assembled in the receiving groove; and the pole post having a vent, the vent being connected to the receiving groove;

[0025] Alternatively, a first plastic material is provided below the cover plate body, and the vent is formed on the first plastic material. The valve body is assembled between the cover plate body and the first plastic material. The second opening is connected to the vent. A third opening is formed on the cover plate body, and the first opening is connected to the third opening.

[0026] A third aspect of this utility model provides a battery, the battery including the exhaust valve described in any embodiment of this application, or including the battery cover assembly described in any embodiment of this application.

[0027] A fourth aspect of this utility model provides an electrical device, the electrical device including the battery described in any embodiment of this application.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 This is a first perspective structural diagram of the exhaust valve provided in the embodiments of this application;

[0031] Figure 2 for Figure 1 Exploded view of the exhaust valve;

[0032] Figure 3 for Figure 1 A sectional view of the middle valve body;

[0033] Figure 4 A cross-sectional view of the limiting member provided in the embodiments of this application;

[0034] Figure 5 A cross-sectional view of the seal provided in the embodiments of this application;

[0035] Figure 6 for Figure 1 Diagram of the sealing state of the exhaust valve;

[0036] Figure 7 for Figure 1 Diagram of the exhaust state structure of the exhaust valve;

[0037] Figure 8 This is a top view of a first structural embodiment of the battery cover assembly provided in this application.

[0038] Figure 9 This is a first structural perspective view of the battery cover assembly provided in an embodiment of this application;

[0039] Figure 10 This is a first structural side view of the battery cover assembly provided in an embodiment of this application;

[0040] Figure 11 for Figure 10 Enlarged view of a portion of point A in the middle;

[0041] Figure 12 for Figure 10 Cross-sectional view of the central pole;

[0042] Figure 13 for Figure 10 Enlarged view of a section at point B in the middle;

[0043] Figure 14 This is a second perspective view of the exhaust valve provided in the embodiments of this application;

[0044] Figure 15 for Figure 14 Exploded view of the exhaust valve;

[0045] Figure 16 for Figure 14 A sectional view of the middle valve body;

[0046] Figure 17 for Figure 14 Diagram of the sealing state of the exhaust valve;

[0047] Figure 18 for Figure 14 Diagram of the exhaust state structure of the exhaust valve;

[0048] Figure 19 This is a top view of a second structure of the battery cover assembly provided in an embodiment of this application;

[0049] Figure 20 This is a second structural perspective view of the battery cover assembly provided in an embodiment of this application;

[0050] Figure 21 This is a second structural side view of the battery cover assembly provided in an embodiment of this application;

[0051] Figure 22 for Figure 21 Enlarged view of a section at point C;

[0052] Figure 23 This is a third perspective view of the exhaust valve provided in the embodiments of this application;

[0053] Figure 24 for Figure 23 First-person exploded view of the exhaust valve;

[0054] Figure 25 for Figure 23 Exploded view of the central exhaust valve from a second perspective.

[0055] Figure 26 for Figure 23 A sectional view of the middle valve body;

[0056] Figure 27 for Figure 23 Diagram of the sealing state of the exhaust valve;

[0057] Figure 28 for Figure 23 Diagram of the exhaust state structure of the exhaust valve;

[0058] Figure 29 This is a top view of a third structure of the battery cover assembly provided in an embodiment of this application;

[0059] Figure 30 This is a third perspective view of the battery cover assembly provided in an embodiment of this application;

[0060] Figure 31 This is a third structural side view of the battery cover assembly provided in an embodiment of this application;

[0061] Figure 32 This is a bottom view of a third structure of the battery cover assembly provided in an embodiment of this application;

[0062] Figure 33 for Figure 31 Enlarged view of a section at point D.

[0063] In the above image:

[0064] 100 Exhaust valve;

[0065] 110 Valve body; 111 Second opening; 112 First opening; 113 Hollow cavity; 114 Welded part; 115 First side wall; 116 First top wall; 117 First bottom wall;

[0066] 120 Seal; 121 Through hole;

[0067] 130 Limiting component; 131 Boss; 132 Limiting groove;

[0068] 140 Elastic component;

[0069] 200 Battery cover assembly; 210 Cover body; 211 Injection hole; 212 Third opening; 220 Positive terminal; 221 Receiving groove; 230 Negative terminal; 240 Explosion-proof valve; 250 First plastic; 260 Second plastic; 270 Riveting block; 280 Sealing ring; 290 Vent. Detailed Implementation

[0070] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0071] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0072] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” as used in this 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” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0073] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0074] In the description of this specification, the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0075] 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 number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0076] To solve the above technical problems, such as Figures 1 to 33 As shown, in a first aspect, this utility model provides an exhaust valve 100, comprising: a valve body 110, the valve body 110 including a hollow cavity 113, and a first opening 112 and a second opening 111 respectively provided at both ends along the axial direction of the valve body 110, the first opening 112 and the second opening 111 communicating with the hollow cavity 113; the first opening 112 is configured to communicate with the outside air, and the second opening 111 is configured to communicate with the vent 290 of the gas generating device.

[0077] A sealing element 120 is disposed inside the valve body 110 at the second opening 111. The sealing element 120 is provided with a through hole 121. The first opening 112, the hollow cavity 113, the through hole 121 and the vent 290 are connected to form an exhaust channel.

[0078] The limiting member 130 is disposed inside the valve body 110 and on the side of the sealing member 120 away from the second opening 111;

[0079] An elastic element 140 is disposed inside the valve body 110 and between the first opening 112 and the limiting element 130.

[0080] The exhaust valve 100 has a first sealed state and a second exhaust state. In the first state, under the elastic force of the elastic member 140, the limiting member 130 and the sealing member 120 are sealed together, so that the through hole 121 is in a closed state. In the second state, the elastic member 140 is compressed and deformed, and the limiting member 130 and the sealing member 120 are in a clearance fit, so that the through hole 121 is in a communicating state with the hollow cavity 113.

[0081] Specifically, the valve body 110 is made of materials including but not limited to stainless steel and aluminum alloy. The valve body 110 has a hollow cavity 113 inside, and the hollow cavity 113 is connected to the first opening 112 and the second opening 111 at both ends of the valve body 110. The first opening 112 is connected to the vent 290 of the gas generating device, and the second opening 111 is connected to the outside air, so that the first opening 112, the hollow cavity 113 and the second opening 111 form an exhaust channel connected to the outside. This exhaust channel is connected to the vent 290 of the gas generating device.

[0082] The location of the vent 290 in the gas generating device can be implemented in various ways. For example, the vent 290 can be a liquid injection hole 211 opened on the battery cover body 210 (see Appendix). Figure 22 For example, the electrolyte filling port 211 of a lithium-ion battery can be used for both venting the battery and filling it with electrolyte. Alternatively, the vent 290 can also be located on the battery terminal (see Appendix). Figure 11 Alternatively, the vent 290 is located on the first plastic 250 below the battery cover body 210 (see Appendix). Figure 33 ).

[0083] Inside the valve body 110, from bottom to top, a sealing element 120, a limiting element 130, and an elastic element 140 are sequentially arranged at the second opening 111. The sealing element 120 can be a rubber gasket, the limiting element 130 can be made of stainless steel or similar materials, and the elastic element 140 can be a spring made of ordinary carbon steel, alloy steel, or stainless steel. For example, both the sealing element 120 and the valve body 110 are cylindrical. The outer diameter of the sealing element 120 and the width of the limiting element 130 along the axial direction perpendicular to the valve body 110 are smaller than the inner diameter of the valve body 110, allowing the sealing element 120 and the limiting element 130 to be fitted into the valve body 110. Furthermore, a gas passage gap is provided between the sealing element 120 and the limiting element 130 and the side wall of the valve body 110 to facilitate the venting of the exhaust valve 100.

[0084] When the gas pressure discharged from the gas generating equipment is less than or equal to the elastic force of the elastic element 140, the exhaust valve 100 is in a sealed first state. Under the elastic force of the elastic element 140, the limiting element 130 moves towards the side closer to the sealing element 120, thereby pressing the limiting element 130 and the sealing element 120 together and sealing them, and sealing the sealing element 120 with the valve body 110 or the pole column. This also causes the through hole 121 of the sealing element 120 to be disconnected from the hollow cavity 113 of the valve body 110, and the gas generating equipment remains sealed.

[0085] When the gas pressure discharged from the gas generating device is greater than the elastic force of the elastic element 140, the exhaust valve 100 is in the second state of exhaust. The elastic element 140 is compressed and deformed by the gas pressure discharged from the gas generating device. The limiting element 130 moves away from the sealing element 120, so that the limiting element 130 and the sealing element 120 are in clearance fit, and the sealing element 120 is in clearance fit with the valve body 110 or the pole column. This makes the through hole 121 of the sealing element 120 and the hollow cavity 113 of the valve body 110 in a communication state, and the vent 290 of the gas generating device and the through hole 121 in a communication state, ensuring the smooth exhaust of the gas generating device.

[0086] Understandably, during the venting process, the limiter 130 and the seal 120 prevent liquid from passing through the gap between the limiter 130 and the seal 120, thus avoiding serious corrosion of the surrounding environment and equipment by the liquid and improving the safety of the gas generating equipment. The liquid discharged from the gas generating equipment can be electrolyte, etc.

[0087] The exhaust valve 100 provided in this application embodiment has a simple structure. It can ensure that the internal pressure of the gas generating equipment does not rise excessively when the gas generating equipment is slowly producing gas, thus avoiding bulging and deformation caused by a small amount of gas production. The exhaust method is gentle and will not damage the structure of the gas generating equipment. It can also ensure that liquid is not discharged during exhaust, thus avoiding serious corrosion to the surrounding environment and equipment, improving the safety of the gas generating equipment, and ensuring the performance of the gas generating equipment.

[0088] In some implementations, such as Figures 2 to 7 , Figure 15 and Figure 25 As shown, the through hole 121 extends through the seal 120 along the axial direction of the valve body 110, and the limiting member 130 includes a boss 131 on the side near the seal 120. In the first state, the boss 131 extends at least partially into the through hole 121 of the seal 120 along the axial direction of the valve body 110.

[0089] Specifically, the boss 131 is inserted into the through hole 121 of the seal 120 along the axial direction of the valve body 110. The boss 131 extends into the through hole 121 of the seal 120 to achieve sealing of the exhaust valve 100; and the boss 131 extends out of the through hole 121 of the seal 120 to achieve exhaust of the exhaust valve 100. The boss 131 can be integrally formed with the limiting member 130, which simplifies the manufacturing process and saves costs.

[0090] In some embodiments, along the axial direction of the valve body 110, the ratio of the height of the boss 131 located in the through hole 121 to the height of the through hole 121 is in the range of 1 / 4 to 1 / 2.

[0091] For example, such as Figure 4 and Figure 5 As shown, the height of the boss 131 along the axial direction of the valve body 110 is d1, and the height of the through hole 121 along the axial direction of the valve body 110 is d2. The ratio of d1 to d2 is between 1 / 4 and 1 / 2. This satisfies the requirement that the boss 131 limits the sealing element 120, and also provides deformation space for the sealing element 120. In addition, it facilitates the control of the exhaust valve 100 between the first and second states according to the amount of gas produced. If the ratio exceeds 1 / 2, the depth of the boss 131 extending into the through hole 121 is too large, which is not conducive to the boss 131 extending out of the through hole 121 of the sealing element 120 when the amount of gas produced is small. If the ratio is less than 1 / 4, the depth of the boss 131 extending into the through hole 121 is too small, which is not conducive to the sealing and limiting of the sealing element 120 by the boss 131.

[0092] In some implementations, such as Figure 4 , Figure 6 , Figure 7 , Figure 11 , Figure 17 , Figure 18 , Figure 22 , Figure 27 , Figure 28 As shown, the limiting member 130 also includes a limiting groove 132 on the other side away from the sealing member 120, and the elastic member 140 is assembled into the limiting groove 132 to limit the elastic member 140.

[0093] Specifically, the limiting groove 132 is fixedly connected to the boss 131, such as by welding or integral molding. The limiting groove 132 can limit the elastic element 140 and prevent the elastic element 140 from deviating from the hollow cavity 113 of the valve body 110.

[0094] In some implementations, such as Figure 4As shown, the limiting member 130 includes a side wall plate and a bottom wall plate. The bottom wall plate is fixed to the bottom end of the side wall plate. The side wall plate and the bottom wall plate surround to form the limiting groove 132, and the elastic member 140 is in a stop-fitting engagement with the bottom wall plate. The bottom wall plate protrudes towards the sealing member 120 to form the boss 131.

[0095] For example, the side wall panel and the bottom wall panel are formed of the same material, such as stainless steel. The limiting groove 132 formed by the side wall panel and the bottom wall panel is used to limit the elastic member 140, and the protruding boss 131 formed by the bottom wall panel is used to seal with the sealing member 120. In this example, the limiting member 130 can be formed by bending a stainless steel plate, which simplifies the processing and saves costs.

[0096] In some implementations, such as Figure 6 , Figure 7 , Figure 17 , Figure 18 , Figure 27 and Figure 28 As shown, the axes of the first opening 112, the second opening 111, and the vent 290 are arranged collinearly.

[0097] Specifically, the first opening 112, the hollow cavity 113, the second opening 111, and the vent 290 are concentrically arranged to form an exhaust channel, which meets the exhaust and sealing requirements of the exhaust valve 100.

[0098] In some embodiments, the valve body 110 includes a first sidewall 115, the top of which extends along an axial direction perpendicular to the valve body 110 and toward the hollow cavity 113, forming a first top wall 116. The first opening 112 is formed on the first top wall 116. In the first state and the second state, the elastic member 140 engages with the first top wall 116 in a stop-fitting manner; or...

[0099] The top of the first sidewall 115 extends along the axial direction perpendicular to the valve body 110 and away from the hollow cavity 113, forming a first top wall 116, and the first opening 112 is formed on the first top wall 116.

[0100] Furthermore, the valve body 110 includes a first sidewall 115, the bottom of the first sidewall 115 extending along an axial direction perpendicular to the valve body 110 and toward the hollow cavity 113 to form a first bottom wall 117, and the second opening 111 is formed on the first bottom wall 117. In the first state, the sealing member 120 is in a sealing fit with the first bottom wall 117, and in the second state, the sealing member 120 is in a clearance fit with the first bottom wall 117; or, the bottom of the first sidewall 115 is an open end, and the open end forms the second opening 111.

[0101] In this embodiment, the valve body 110 is made of materials including but not limited to stainless steel and aluminum alloy, and the valve body 110 can adopt three different structures, such as... Figure 3 , Figure 6 and Figure 7 As shown, the first valve body 110 structure is as follows: the valve body 110 includes a first side wall 115 and a first top wall 116. The first side wall 115 and the first top wall 116 can be made of the same material (such as stainless steel). The first top wall 116 has a first opening 112 that communicates with the outside. The bottom end of the first side wall 115 directly forms a second opening 111. After the first side wall 115 surrounds and forms a hollow cavity 113, the sealing element 120, the limiting element 130 and the elastic element 140 are assembled into the hollow cavity 113. Then, the top of the first side wall 115 extends along the axis perpendicular to the valve body 110 and toward the side close to the hollow cavity to form the first top wall 116, which facilitates the assembly of the sealing element 120, the limiting element 130 and the elastic element 140, etc.

[0102] like Figures 16 to 18 As shown, the second type of valve body 110 structure is as follows: the valve body 110 includes a first side wall 115, a first top wall 116 and a first bottom wall 117. The first side wall 115, the first top wall 116 and the first bottom wall 117 can be made of the same material (such as stainless steel). The first top wall 116 has a first opening 112 that communicates with the outside, and the first bottom wall 117 has a second opening 111 that communicates with the vent 290. The bottom of the first sidewall 115 extends along the axial direction perpendicular to the valve body 110 and toward the side closer to the hollow cavity to form a first bottom wall 117. After the first sidewall 115 and the first bottom wall 117 enclose the hollow cavity 113, the sealing element 120, the limiting element 130 and the elastic element 140 are assembled into the hollow cavity 113. Then, the top of the first sidewall 115 extends along the axial direction perpendicular to the valve body 110 and toward the side closer to the hollow cavity to form a first top wall 116, which facilitates the assembly of the sealing element 120, the limiting element 130 and the elastic element 140, etc.

[0103] It should be noted that in the first valve body 110 structure and the second valve body 110 structure, the length of the first top wall 116 accounts for 10%-20% of the length of the first side wall 115. The first side wall 115 and the first top wall 116 are made of the same material, which makes it easy for the first side wall 115 to be bent to form the first top wall 116, and also makes it easy for the sealing element 120, the limiting element 130 and the elastic element 140 to be assembled into the hollow cavity 113 formed by the first side wall 115.

[0104] In some embodiments, when the elastic element 140 is engaged with the first top wall 116, the width of the elastic element 140 along the axial direction perpendicular to the valve body 100 is greater than the maximum diameter of the first opening 112.

[0105] Specifically, in both the first and second valve body 110 structures, the width of the elastic member 140 along the axial direction perpendicular to the valve body 110 is greater than the maximum diameter of the first opening 112. The edge of the first opening 112 is located inside the edge of the elastic member 140, allowing the elastic member 140 to engage with the first top wall 116, and the first top wall 116 to limit the elastic member 140, preventing it from extending out of the hollow cavity 113. For example, the first opening 112 is circular, and the width of the elastic member 140 along the axial direction perpendicular to the valve body 110 is greater than the diameter of the first opening 112, ensuring that the elastic member 140 maintains an engagement with the first top wall 116 in both the first and second states. The first opening 112 can also be square, triangular, or arc-shaped, and the second opening 111 can also be circular, square, triangular, or arc-shaped, etc., which can be customized according to actual needs by those skilled in the art.

[0106] like Figures 26 to 28 As shown, the third type of valve body 110 structure is as follows: the valve body 110 includes a first side wall 115, the bottom end of the first side wall 115 extends along the axial direction perpendicular to the valve body 110 and toward the side close to the hollow cavity to form a first bottom wall 117, and the first bottom wall 117 is provided with a second opening 111 communicating with the vent 290; the top of the first side wall 115 is directly formed with a first opening 112 communicating with the outside, and the top of the first side wall 115 extends along the axial direction perpendicular to the valve body 110 and toward the side away from the hollow cavity to form a first top wall 116. The first side wall 115, the first top wall 116 and the first bottom wall 117 can be made of the same material (such as stainless steel), and the processing technology is simple.

[0107] It should be noted that the first sidewall 115 can be a circular sidewall or a square sidewall, and those skilled in the art can set it according to actual needs.

[0108] In a second aspect, a battery cover assembly 200 is provided, including a cover body 210, a vent 290 is provided on the cover body 210, and an exhaust valve 100 as described in any embodiment of this application is provided at the vent 290.

[0109] Specifically, the exhaust valve 100 described in any embodiment of this application is installed at the vent 290 on the battery cover body 210. This ensures that the gas-generating equipment, such as a secondary battery, can exhaust gas in a timely manner when it slowly generates gas, keeping its internal pressure constant within a certain range. It also ensures that the explosion-proof valve 240 will not fail to burst in time due to excessive gas release, thereby improving the safety of the secondary battery. Furthermore, the liquid is not discharged during exhaust, avoiding serious corrosion to the surrounding environment and equipment, thus improving the safety of the gas-generating equipment and ensuring its performance.

[0110] It should be noted that the specific technical features and technical effects of the battery cover assembly 200200 provided in this application embodiment are the same as the technical features and technical effects of the exhaust valve 100, and will not be repeated in this application embodiment.

[0111] It is understandable that, such as Figures 8 to 10 , Figures 19 to 21 , Figures 29 to 32 As shown, the battery includes a cover body 210, with positive terminal posts 220 and negative terminal posts 230 on both sides of the cover body 210. An explosion-proof valve 240 and a liquid injection hole 211 are located in the middle of the cover body 210. A protective patch is located above the explosion-proof valve 240, which serves as a safety outlet in case of a sudden increase in air pressure. See also... Figure 12 The cover plate body 210 has a first plastic 250 below it and a second plastic 260 above it. The cover plate body 210 has a rivet block 270 and a sealing ring 280 at the positive electrode post 220 and the negative electrode post 230. The rivet block 270 is welded to the corresponding positive electrode post 220 or to the corresponding negative electrode post 230.

[0112] In some embodiments, the cover plate body 210 is provided with an injection hole 211, the injection hole 211 is used to inject electrolyte into the battery, the injection hole 211 forms the vent 290, the valve body 110 is fixedly connected to the cover plate body 210, and the second opening 111 of the valve body 110 is connected to the injection hole 211.

[0113] Alternatively, the cover plate body 210 is provided with a pole post, the pole post including a positive pole post 220 and / or a negative pole post 230, the pole post is provided with a receiving groove 221, the valve body 110 is assembled in the receiving groove 221; and the pole post is provided with a vent 290, the vent 290 is connected to the receiving groove 221;

[0114] Alternatively, a first plastic 250 is provided below the cover body 210, and the first plastic 250 has the vent 290. The valve body 110 is assembled between the cover body 210 and the first plastic 250. The second opening 111 is connected to the vent 290. The cover body 210 has a third opening 212, and the first opening 112 is connected to the third opening 212.

[0115] Specifically, the exhaust valve 100 provided in this embodiment can be installed at the injection hole 211, the positive electrode post 220, the negative electrode post 230, or at the junction of the cover plate body 210 and the first plastic 250. The first, second, and third valve body 110 structures can all be fixedly installed with the cover plate body 210 via the welding part 114.

[0116] For example, such as Figures 8 to 10 As shown, the first type of valve body 110 structure can be installed at the positive terminal 220 or the negative terminal 230. Taking the positive terminal 220 as an example, a receiving groove 221 is formed inside the positive terminal 220. A welding part 114 is provided on the outer side of the upper end of the first side wall 115 of the valve body 110. The valve body 110 is completely located within the receiving groove 221 and is fixedly connected to the positive terminal 220 through the welding part 114; or, the valve body 110 is partially located within the receiving groove 221 and partially extends out of the receiving groove 221. A vent 290 is also formed on the positive terminal 220 and communicates with the receiving groove 221. The vent 290 is communicated with the battery cell inside the battery for venting the battery. In this example, there are no special requirements for the height of the exhaust valve 100 and the pole (positive pole 220 or negative pole 230). If the height of the exhaust valve 100 is lower than the pole, it can save space; if the height of the exhaust valve 100 is higher than the pole, it is convenient to connect the exhaust valve 100 to the external suction pipe for easy exhaust.

[0117] For example, such as Figures 19 to 21 As shown, in the second type of valve body 110 structure, the cover plate body 210 has a groove at the position of the injection hole 211, and the lower end of the first side wall 115 of the valve body 110 is provided with a welding part 114. The valve body 110 is located in the groove and is fixedly connected to the cover plate body 210 through the welding part 114, so that the exhaust valve 100 protrudes from the cover plate body 210.

[0118] For example, such as Figures 29 to 32 As shown, in the third type of valve body 110 structure, the valve body 110 is located within the cavity formed by the first plastic 250 and the cover plate body 210, and the upper end of the first side wall of the valve body 110 is fixedly connected to the lower side wall of the cover plate body 210 through the first top wall 116, and the first bottom wall 117 of the valve body 110 is clearance-fitted with the first plastic 250. In this example, the two ends of the elastic member 140 abut against the cover plate body 210 and the limiting member 130, respectively. It can be understood that the axes of the third opening 212, the second opening 111, and the first opening 112 are collinear with the axis of the vent 290. The third type of valve body 110 structure can be located below the edge of the cover plate body 210.

[0119] It should be noted that the first type of valve body 110 structure can also be located at the injection hole 211. The first side wall 115 of the valve body 110 is fixedly connected to the cover plate body 210 through the welding part 114, so as to realize the protrusion of the exhaust valve 100 relative to the cover plate body 210. The second type of valve body 110 structure can also be located at the positive electrode post 220 or the negative electrode post 230. The design principle is similar, and it will not be described in detail in this application.

[0120] A third aspect of this utility model provides a battery, which includes the exhaust valve 100 described in any embodiment of this application, or the battery cover assembly 200 described in any embodiment of this application.

[0121] Specifically, the exhaust valve 100 can promptly discharge the gas generated by the electrolyte reaction inside the battery cell, stabilizing the internal gas pressure of the battery cell. The specific technical features and effects of the battery are consistent with those of the exhaust valve 100, and will not be repeated in the embodiments of this application. The battery can be a lithium-ion battery, etc.

[0122] A fourth aspect of this utility model provides an electrical device, the electrical device including the battery described in any embodiment of this application.

[0123] Specifically, the technical features and effects of the electrical equipment are consistent with those of the exhaust valve, and will not be repeated in the embodiments of this application.

[0124] It should be noted that electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This utility model embodiment does not impose any special limitations on the above-mentioned electrical equipment.

[0125] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An exhaust valve (100), characterized in that, include: The valve body (110) includes a hollow cavity (113). A first opening (112) and a second opening (111) are respectively provided at both ends of the valve body (110) along the axial direction. The first opening (112) and the second opening (111) are connected to the hollow cavity (113). The first opening (112) is connected to the outside air, and the second opening (111) is connected to the vent (290) of the gas generating device. A sealing element (120) is disposed inside the valve body (110) at the second opening (111). The sealing element (120) is provided with a through hole (121). The first opening (112), the hollow cavity (113), the through hole (121) and the vent (290) are connected to form an exhaust channel. A limiting member (130) is disposed inside the valve body (110) and on the side of the sealing member (120) away from the second opening (111); An elastic element (140) is disposed inside the valve body (110) and between the first opening (112) and the limiting element (130); The exhaust valve (100) has a first sealed state and a second exhaust state. In the first state, under the elastic force of the elastic member (140), the limiting member (130) and the sealing member (120) are sealed together, so that the through hole (121) is in a closed state. In the second state, the elastic member (140) is compressed and deformed, and the limiting member (130) and the sealing member (120) are in a clearance fit, so that the through hole (121) and the hollow cavity (113) are in a communicating state.

2. The exhaust valve (100) according to claim 1, characterized in that, The through hole (121) extends through the seal (120) along the axial direction of the valve body (110), and the limiting member (130) includes a boss (131) on the side near the seal (120). In the first state, the boss (131) extends at least partially into the through hole (121) of the seal (120) along the axial direction of the valve body (110).

3. The exhaust valve (100) according to claim 2, characterized in that, Along the axial direction of the valve body (110), the ratio of the height of the boss (131) located in the through hole (121) to the height of the through hole (121) is in the range of 1 / 4 to 1 / 2.

4. The exhaust valve (100) according to claim 2, characterized in that, The limiting member (130) also includes a limiting groove (132) on the other side away from the sealing member (120), and the elastic member (140) is fitted into the limiting groove (132) to limit the elastic member (140).

5. The exhaust valve (100) according to claim 4, characterized in that, The limiting member (130) includes a side wall plate and a bottom wall plate. The bottom wall plate is fixed to the bottom end of the side wall plate. The side wall plate and the bottom wall plate surround each other to form the limiting groove (132). The elastic member (140) is in a stop-fitting relationship with the bottom wall plate. The bottom wall plate protrudes towards the sealing member (120) to form the boss (131).

6. The exhaust valve (100) according to claim 1, characterized in that, The first opening (112), the second opening (111), and the vent (290) are arranged along the same axis.

7. The exhaust valve (100) according to claim 1, characterized in that, The valve body (110) includes a first sidewall (115), the top of which extends along an axial direction perpendicular to the valve body (110) and toward the hollow cavity (113) to form a first top wall (116). The first opening (112) is formed on the first top wall (116). In the first state and the second state, the elastic member (140) engages with the first top wall (116); or, The top of the first sidewall (115) extends along an axial direction perpendicular to the valve body (110) and toward the direction away from the hollow cavity (113) to form a first top wall (116), and the first opening (112) is formed on the first top wall (116).

8. The exhaust valve (100) according to claim 1, characterized in that, The valve body (110) includes a first sidewall (115), the bottom of the first sidewall (115) extends along an axial direction perpendicular to the valve body (110) and toward the hollow cavity (113) to form a first bottom wall (117), and a second opening (111) is formed on the first bottom wall (117). In the first state, the sealing element (120) is sealed to the first bottom wall (117), and in the second state, the sealing element (120) is clearance-fitted to the first bottom wall (117). Alternatively, the bottom of the first sidewall (115) is an open end, which forms the second opening (111).

9. The exhaust valve (100) according to claim 7, characterized in that, When the elastic element (140) is engaged with the first top wall (116), the width of the elastic element (140) along the axial direction perpendicular to the valve body (110) is greater than the maximum diameter of the first opening (112).

10. A battery cover assembly (200), characterized in that, It includes a cover plate body (210), on which a vent (290) is provided, and at the vent (290) a vent valve (100) as described in any one of claims 1-9 is provided.

11. The battery cover assembly (200) according to claim 10, characterized in that, The cover plate body (210) is provided with an injection hole (211), which is used to inject electrolyte into the battery. The injection hole (211) forms the vent (290). The valve body (110) is fixedly connected to the cover plate body (210), and the second opening (111) of the valve body (110) is connected to the injection hole (211). Alternatively, the cover plate body (210) is provided with a pole post, the pole post including a positive pole post (220) and / or a negative pole post (230), the pole post is provided with a receiving groove (221), the valve body (110) is assembled in the receiving groove (221); and the pole post is provided with a vent (290), the vent (290) is connected to the receiving groove (221); Alternatively, a first plastic (250) is provided below the cover body (210), and the first plastic (250) has the vent (290) formed thereon. The valve body (110) is assembled between the cover body (210) and the first plastic (250). The second opening (111) is connected to the vent (290). The cover body (210) has a third opening (212), and the first opening (112) is connected to the third opening (212).

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