Battery pressure relief device, battery box body and battery

Abstract

The utility model provides a battery pressure relief device, a battery box body and a battery. A battery pressure relief device comprises a valve seat, a valve body and a valve element, the valve seat is detachably connected with the valve body, a first pressure relief channel is formed in the valve seat, a second pressure relief channel is formed in the valve body, the first pressure relief channel is communicated with the second pressure relief channel, and the second pressure relief channel is communicated with the valve element. The valve element is arranged in the second pressure relief channel, one end of the valve element is connected with the valve body, and the other end of the valve element is a free end so that the tail end of the free end can abut against or be away from the inner wall of the valve body when bearing different axial external force. The battery has the beneficial effect that a large amount of gas generated in the battery can be discharged in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a battery pressure relief device, a battery box and a battery. BACKGROUND

[0002] At present, with the continuous development of new energy and energy storage technology fields, it promotes the continuous innovation and progress of the battery field. Among them, due to the advantages of safety, high efficiency, no pollution, high specific energy, rich raw materials, multiple cycle times, long storage time and other advantages of lithium ion batteries, not only in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric equipment.

[0003] The wide application of lithium ion batteries makes the market have higher and higher safety requirements for lithium ion batteries and cycle life and capacity requirements of lithium ion batteries. In the prior art, when the lithium ion battery is formed, a large amount of gas will be generated in the lithium ion battery. If these gases are not discharged outside in time, there will be a risk of battery expansion affecting the service life of the battery or causing explosion. UTILITY MODEL CONTENT

[0004] The utility model provides a battery pressure relief device, a battery box and a battery to solve the problem that a large amount of gas is generated in the lithium ion battery when the lithium ion battery is formed, and if these gases are not discharged outside in time, there will be a risk of battery expansion affecting the service life of the battery or causing explosion.

[0005] The embodiment of the utility model is implemented as follows:

[0006] A battery pressure relief device is used for relieving the pressure in the battery, comprising a valve seat, a valve body and a valve core, the valve seat is detachably connected with the valve body, a first pressure relief channel is formed in the valve seat, a second pressure relief channel is formed in the valve body, the first pressure relief channel communicates with the second pressure relief channel, the valve core is arranged in the second pressure relief channel, one end of the valve core is connected with the valve body, and the other end of the valve core is a free end, so that the end part of the free end is close to or away from the inner wall of the valve body when subjected to different axial external forces.

[0007] In order to discharge the gas in the battery to the outside, the battery pressure relief device of the application has a first pressure relief channel in the valve seat and a second pressure relief channel in the valve body. Meanwhile, a valve core is arranged in the second pressure relief channel and can swing relative to the valve body. When the gas in the battery is more, the pressure in the battery is greater than the pressure outside, one end of the valve core is separated from the inner wall of the second pressure relief channel, and the gas in the battery is discharged to the outside through the first pressure relief channel and the second pressure relief channel. On the contrary, the valve core closes the second pressure relief channel to avoid the air or dust outside entering the battery and affecting the performance of the battery.

[0008] In a possible implementation, when the pressure difference between the pressure inside the valve body and the pressure outside is greater than or equal to 1 atmosphere, the free end of the valve core is away from the inner wall of the valve body.

[0009] In a possible implementation, the maximum radial distance of the free end away from the inner wall of the valve body is at least 0.67 mm.

[0010] In a possible implementation, the valve core includes a valve flap, the valve flap includes a connecting section and a sealing section extending from the connecting section, the connecting section is pivoted to the valve body and can rotate relative to the valve body to drive the sealing section to swing, so that the sealing section seals or is away from the second pressure relief channel.

[0011] In a possible implementation, one end of the connecting section is pivoted to the inner wall or the outer wall of one side of the second pressure relief channel, and the sealing section can swing relative to the inner wall of the other side of the second pressure relief channel to seal or be away from the second pressure relief channel.

[0012] In a possible implementation, the valve core further includes a linkage member extending from one side of the connecting section away from the first pressure relief channel, a gap is formed between one side of the linkage member away from the sealing section and the valve body, and the gap communicates with the second pressure relief channel.

[0013] In a possible implementation, the valve seat includes a seat body and a support member sleeved outside the seat body, the first pressure relief channel penetrates through the seat body and the support member, and the seat body is connected to the valve body.

[0014] In a possible implementation, the seat body includes a first seat body and a second seat body, the first seat body and the second seat body are oppositely arranged, one end of the support member is connected to the first seat body, the other end is connected to the second seat body, the first seat body is located on the side of the support member close to the second pressure relief channel, the second seat body is located on the side of the support member away from the second pressure relief channel, and the first seat body is detachably connected to the valve body.

[0015] This application embodiment also provides a battery box, including a box body and a battery pressure relief device as described above. The battery pressure relief device is disposed on the box body. The box body has an exhaust port. A portion of the battery pressure relief device passes through the exhaust port into the interior of the box body and communicates with the interior of the box body and the first pressure relief channel and the second pressure relief channel.

[0016] This application embodiment also provides a battery, including a battery housing as described above and a battery module disposed inside the battery housing.

[0017] When using this battery pressure relief device to depressurize the battery, firstly, a valve core is installed in the second pressure relief channel. This valve core not only separates from the inner wall of the second pressure relief channel to release gas from the battery to the outside when pressure relief is needed, but also prevents outside air and dust from entering the battery. Secondly, the valve seat and valve body are detachably connected, allowing for easy cleaning of the device by disassembling both components, increasing its reusability. This avoids the safety hazards of battery expansion due to the failure to promptly release large amounts of gas generated during battery formation, which could affect battery life or even lead to explosion. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a battery box according to an embodiment of the present invention.

[0021] Figure 3 This is an exploded view of a battery pressure relief device according to an embodiment of the present invention.

[0022] Figure 4 It shows Figure 3 A schematic diagram of the valve disc in the battery pressure relief device.

[0023] Figure 5 It shows Figure 3 Another schematic diagram of the valve disc in the battery pressure relief device.

[0024] Figure 6 It shows Figure 3A structural schematic view of the valve flap and linkage in the battery pressure relief device in the first embodiment.

[0025] Figure 7 A structural schematic view of the valve flap and linkage in the battery pressure relief device in the second embodiment is shown. Figure 3

[0026] Figure 8 A structural schematic view of the valve flap and linkage in the battery pressure relief device in the third embodiment is shown. Figure 3

[0027] Figure 9 A structural schematic view of the valve flap and linkage in the battery pressure relief device in the fourth embodiment is shown. Figure 3

[0028] Figure 10 A sectional schematic view of the battery pressure relief device in the first embodiment in the exhaust state is shown. Figure 3

[0029] Figure 11 A partial structural schematic view of the battery pressure relief device in the first embodiment in the exhaust state is shown. Figure 3

[0030] Figure 12 A sectional schematic view of the battery pressure relief device in the first embodiment in the normal state is shown. Figure 3

[0031] Figure 13 A partial structural schematic view of the battery pressure relief device in the first embodiment in the normal state is shown. Figure 3 Main element symbol explanation:

[0032] Battery pressure relief device, 100; valve seat, 10; first pressure relief passage, 11; seat body, 12; first seat body, 121; second seat body, 122; external thread, 123; connecting part, 124; guiding part, 125; support part, 13; valve body, 20; second pressure relief passage, 21; internal thread, 22; opening, 23; valve core, 30; valve flap, 31; connecting section, 311; sealing section, 312; linkage, 32; gap, 40; battery box body, 200; box body, 210; cover plate, 211; exhaust port, 220; containing space, 230; battery, 300; battery module, 310; hole bottom surface, P1; first surface, P2; second surface, P3; first direction, X; second direction, Y.

[0033] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings.

[0034] DETAILED DESCRIPTION DETAILED DESCRIPTION

[0035] ​​​​​​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0036] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are for purposes of illustration only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise.

[0038] Some embodiments of the present application are described in detail. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] In order to better understand the content of the present application, some professional terms need to be explained.

[0040] Battery formation is a key step in the battery manufacturing process. The battery formation process mainly activates the positive and negative materials inside the battery through a specific charge and discharge method, thereby improving the overall performance of the battery. During the battery formation process, a solid electrolyte interface film (SEI film) is formed on the surface of the negative electrode after the battery goes through the formation process. The SEI film is a passivation thin layer formed on the interface between the carbon negative electrode and the electrolyte, which has an important influence on the charge and discharge performance, self-discharge performance and storage performance of the battery.

[0041] The purpose of battery formation is not only to activate the chemical reaction inside the battery, but also to improve the charge and discharge performance, self-discharge performance and storage performance of the battery. The key factors in the formation process include formation current, voltage, temperature and external pressure, which jointly affect the formation quality.

[0042] Embodiments

[0043] Reference Figure 1The embodiment provides a battery 300. The battery 300 comprises a battery box 200 and a battery module 310. In the embodiment, Figure 1 Part of the structure of the battery box 200 is shown, and the specific battery box 200 will be described below, which is not described here again. Meanwhile, the number of the battery module 310 can be one or more. The one or more battery modules 310 are fixed to the battery box 210.

[0044] Please refer to Figure 2 The battery box 200 comprises a battery pressure relief device 100 and a box body 210. In the embodiment, Figure 2 The box body 210 in the embodiment only shows part of the structure, and the box body 210 can be a hollow shell. The one or more battery modules 310 are fixed to the inside of the box body 210. In other embodiments, the battery box 200 can also be a hollow box body of various shapes, and the application does not limit this as long as the one or more battery modules 310 can be fixed to the inside of the box body 210. Meanwhile, the battery pressure relief device 100 is arranged on the box body 210.

[0045] When the battery is formed, the battery module 310 will generate a large amount of gas in the inside of the box body 210. Specifically, the box body 210 comprises a cover plate 211, the cover plate 211 is provided with an exhaust port 220 and a containing space 230 formed by expanding upward from the exhaust port 220. The exhaust port 220 is communicated with the containing space 230. In the embodiment, the containing space 230 is a through stepped hole, and the exhaust port 220 and the containing space 230 are coaxially arranged. The battery pressure relief device 100 is partially arranged in the containing space 230 after penetrating the exhaust port 220. The exhaust port 220 is communicated with the inside of the battery pressure relief device 100. So that a large amount of gas generated by the battery module 310 in the inside of the box body 210 can be discharged to the outside through the exhaust port 220 and the battery pressure relief device 100.

[0046] The following will specifically describe the process of how the gas in the inside of the box body 210 is discharged to the outside through the exhaust port 220 and the battery pressure relief device 100 when a large amount of gas is generated by the battery module 310 in the inside of the box body 210.

[0047] Please refer to Figure 2 and Figure 3The battery pressure relief device 100 comprises a valve seat 10, a valve body 20 and a valve core 30. One end of the valve seat 10 is connected to the box body 210 after penetrating the accommodation space 230 and the exhaust port 220, and the other end is detachably connected to the valve body 20. The valve seat 10 is provided with a first pressure relief channel 11, and the valve body 20 is provided with a second pressure relief channel 21. The first pressure relief channel 11 is connected to the second pressure relief channel 21 and the inside of the box body 210. The valve core 30 is arranged in the second pressure relief channel 21, and one end of the valve core 30 is connected to the valve body 20. The other end of the valve core 20 is a free end, so that the end of the free end abuts or is away from the inner wall of the valve body 20 when subjected to different axial external forces.

[0048] In this embodiment, the valve body 20 is a hollow cylindrical structure, which comprises a cylindrical barrel and a conical barrel extending away from the cylindrical barrel. The end of the cylindrical barrel away from the conical barrel is connected to the valve seat 10. The diameter of the second pressure relief channel 21 in the conical barrel is equal to the diameter of the second pressure relief channel 21 in the cylindrical barrel. The valve core 30 can be connected to the end face of the end of the valve body 20 away from the valve seat 10, or can be connected to the inner wall or outer wall of the second pressure relief channel 21, as long as the valve core 30 can swing relative to the valve body 20 to open or close the second pressure relief channel 21. The specific position of the valve core 30 connected to the valve body 20 is not limited in the present application. In other embodiments, the diameter of the second pressure relief channel 21 in the conical barrel can be greater than the diameter of the second pressure relief channel 21 in the cylindrical barrel. Alternatively, the diameter of the second pressure relief channel 21 in the conical barrel can be less than the diameter of the second pressure relief channel 21 in the cylindrical barrel.

[0049] In the battery pressure relief device 100, when the battery module 310 generates more gas inside the box body 210, the pressure inside the box body 210 is greater than the pressure outside. In order to avoid affecting the quality of the battery module 310, it is necessary to exhaust the battery module 310. At this time, the valve core 30 is affected by the large pressure difference between the inside of the box body 210 and the outside of the box body 210. The valve core 30 can automatically open the second pressure relief channel 21, so that the gas inside the box body 210 can be timely exhausted to the outside through the first pressure relief channel 11, the second pressure relief channel 21 and the exhaust port 220. Conversely, when the gas inside the box body 210 is exhausted to the outside, the pressure inside the box body 210 is the same as the pressure outside the box body 210. The valve core 30 can automatically close the second pressure relief channel 21 under its own gravity to ensure the sealing of the inside of the box body 210. In this embodiment, when the pressure difference between the pressure inside the box body 210 and the pressure outside the box body 210 is greater than or equal to 1 atmosphere, the valve core 30 can automatically open the second pressure relief channel 21 to relieve the pressure of the box body 210.

[0050] In some embodiments, the maximum radial distance from the free end of the valve core 30 to the interior of the valve body 20 is at least 0.67 mm. For example, the maximum radial distance from the free end of the valve core 30 to the interior of the valve body 20 can be 0.67 mm, 0.7 mm, 0.85 mm, 1.5 mm, etc. The present application does not limit the specific value of the maximum radial distance from the free end of the valve core 30 to the interior of the valve body 20.

[0051] In one embodiment, please also combine Figure 4 The valve core 30 includes a valve flap 31. The valve flap 31 includes a connecting section 311 and a sealing section 312 extending from the connecting section 311. The connecting section 311 is pivoted to the valve body 20, and the connecting section 311 can rotate relative to the valve body 20 to drive the sealing section 312 to swing, so that the sealing section 312 seals or moves away from the second pressure relief passage 21. In this embodiment, the connecting section 311 and the sealing section 312 are integrally formed, and the sealing section 312 extends from the connecting section 311 in a direction away from the first pressure relief passage 11, so that the sealing section 312 can be bent and swung in a direction close to or away from the first pressure relief passage 11 under the rotation of the connecting section 311. In this way, the connecting section 311 and the sealing section 312 can jointly open or close the second pressure relief passage 21.

[0052] In other embodiments, the sealing section 312 can also be bent and extend from the connecting section 311 in a direction close to the first pressure relief passage 11. The connecting section 311 and the sealing section 312 can also not be integrally formed, that is, the connecting section 311 connects the sealing section 312, as long as the connecting section 311 can drive the sealing section 312 to swing when the connecting section 311 rotates relative to the valve body 20, so that the sealing section 312 seals or moves away from the second pressure relief passage 21.

[0053] At the same time, the valve flap 31 can be made of a material with elasticity, such as rubber, etc. The end surface of the end of the sealing section 312 away from the connecting section 311 can be completely fitted with the inner wall of the second pressure relief passage 21. When the connecting section 311 rotates relative to the valve body 20, the sealing section 312 can be driven to swing, so that the sealing section 312 can elastically abut against the inner wall of the second pressure relief passage 21. On the one hand, the sealing section 312 tightly fits the inner wall of the second pressure relief passage 21, ensuring that the valve flap 31 completely seals the second pressure relief passage 21, thereby ensuring the sealing of the interior of the box body 210. On the other hand, the back-and-forth swinging of the sealing section 312 can also avoid damaging the inner wall of the second pressure relief passage 21. The present application does not limit the specific material of the valve flap 31, as long as it has elasticity.

[0054] For the valve core 30, the present application provides several different designs, and the specific contents are as follows:

[0055] Design 1: as Figure 4As shown, along the second direction Y, one end of the connecting section 311 is pivoted to the inner wall of one side of the second pressure relief passage 21, and the sealing section 312 can swing relative to the inner wall of the other side of the second pressure relief passage 21 to seal or open the second pressure relief passage 21. Further, the shape of the projection of the valve flap 31 along the first direction X is the same as the shape of the cross section of the second pressure relief passage 21 along the second direction Y, and the first direction X and the second direction Y are perpendicular to each other.

[0056] When the box body 210 needs to be vented, the valve flap 31 opens the second pressure relief passage 21, and a large amount of gas in the box body 210 can be discharged to the outside through the first pressure relief passage 11 and the second pressure relief passage 21. Conversely, when the venting of the box body 210 is completed, the valve flap 31 closes the second pressure relief passage 21 to ensure the air tightness of the box body 210 and the battery pressure relief device 100.

[0057] Based on the design 1, the valve core 30 can also be improved, and the improved design is as follows:

[0058] Design 2: Please refer to Figure 5 The valve core 30 further includes a linkage 32. The linkage 32 extends from one side of the connecting section 311 away from the first pressure relief passage 11, and the linkage 32 is connected to the inner wall of the second pressure relief passage 21 away from the sealing section 312.

[0059] Design 3: Please refer to Figure 6 The linkage 32 extends from one side of the connecting section 311 away from the first pressure relief passage 11, and a gap 40 is formed between the linkage 32 away from the sealing section 312 and the valve body 20.

[0060] In this embodiment, when the box body 210 needs to be vented, the sealing section 312 swings away from the first pressure relief passage 11, thereby driving the linkage 32 to move towards the gap 40. In this way, the sealing section 312 opens the second pressure relief passage 21, and the gas in the box body 210 can be discharged to the outside through the first pressure relief passage 11 and the second pressure relief passage 21. When the sealing section 312 opens the second pressure relief passage 21, the gap 40 can avoid damage to the valve flap 31 and the linkage 32 due to the pressure difference between the inside and outside of the box body 210.

[0061] In this embodiment, the shape of the linkage 32 is a triangular column. That is, one side of the linkage 32 is connected to the connecting section 311, and the other side is connected to the inner wall of the second pressure relief passage 21. Alternatively, one side of the linkage 32 is connected to the connecting section 311, and the other side forms a gap 40 with the inner wall of the second pressure relief passage 21. In other embodiments, the shape of the linkage 32 can also be a cuboid, a cube, etc. The shape of the linkage 32 is not limited in the present application.

[0062] Design 4: AsFigure 7 As shown, the valve body 20 is provided with an opening 23. The opening 23 is located at one end of the valve body 20 away from the valve seat 10, and the opening 23 is connected to the second pressure relief channel 21. The connecting section 311 is connected to the valve body 20, and the sealing section 312 can swing relative to the valve body 20 to open or close the opening 23. Further, the projection of the valve flap 31 along the first direction X has the same shape as the cross section of the second pressure relief channel 21 along the second direction Y, and the first direction X and the second direction Y are perpendicular to each other.

[0063] Based on the design 4, the valve core 30 can also be improved, and the improved design is as follows:

[0064] Design 5: please combine Figure 8 The valve core 30 further comprises a linkage 32. The linkage 32 extends from one side of the connecting section 311 to the direction close to the first pressure relief channel 11, and the side of the linkage 32 away from the sealing section 312 is connected to the inner wall of the second pressure relief channel 21.

[0065] Design 6: please combine Figure 9 The linkage 32 extends from one side of the connecting section 311 to the direction close to the first pressure relief channel 11, and the side of the linkage 32 away from the sealing section 312 and the valve body 20 forms a gap 40. The gap 40 is connected to the second pressure relief channel 21.

[0066] The linkage 32 is arranged on one side of the connecting section 311. On the one hand, when it is necessary to exhaust the box body 210, the sealing section 312 is bent at the connection with the connecting section 311 to open the opening 23. On the other hand, after the box body 210 is exhausted, the linkage 32 pulls the valve flap 31 in the direction close to the first pressure relief channel 11 under its own gravity, so that the valve flap 31 quickly closes the opening 23 to ensure the sealing performance of the box body 210 after the exhaust.

[0067] Specifically, please combine Figure 10 and Figure 11 When the battery 300 is being formed, a large amount of gas is generated in the box body 210, and the internal pressure of the box body 210 is greater than the external pressure. When the internal pressure of the box body 210 is greater than the external pressure, the battery pressure relief device 100 is in an exhaust state. Due to the pressure difference between the inside of the box body 210 and the outside, the connecting section 311 rotates relative to the valve body 20 to drive the sealing section 312 to swing, thereby opening the second pressure relief channel 21. In this way, a large amount of gas in the box body 210 is discharged to the outside through the first pressure relief channel 11 in the valve seat 10 and the second pressure relief channel 21 in the valve body 20.

[0068] Please combine Figure 12 and Figure 13When the gas in the box body 210 is exhausted to the outside, the battery pressure relief device 100 is in a normal state, at this time, the pressure in the box body 210 is the same as the outside. Due to the gravity of the valve core 30, the gravity of the valve core 30 will make the valve core 30 swing relative to the valve body 20, so that the valve core 30 closes the second pressure relief channel 21, to ensure the sealing of the box body 210 and prevent the outside air and dust and other impurities from entering the inside of the battery 300, to prevent the electrolyte of the battery 300 from being contaminated, to affect the performance of the battery 300.

[0069] In some embodiments, please refer to Figure 11 , the valve seat 10 includes a seat body 12 and a support 13 sleeved outside the seat body 12, and the first pressure relief channel 11 penetrates the seat body 12 and the support 13. One end of the seat body 12 is connected to the valve body 20, and the other end penetrates the exhaust port 220 and the containing space 230 and is connected to the box body 210, and the support 13 abuts between the cover plate 211 and the valve body 20. In this embodiment, the seat body 12 and the support 13 can be integrally formed, and the support 13 is arranged around the outer circumferential surface of the seat body 12.

[0070] Specifically, the containing space 230 has a hole bottom surface P1. The support 13 has a first surface P2 and a second surface P3, and the first surface P2 and the second surface P3 are oppositely arranged. The first surface P2 is located at one end of the support 13 close to the valve body 20, and the first surface P2 is attached to the end face of one end of the valve body 20. When the valve seat 10 penetrates the exhaust port 220 and the containing space 230, the second surface P3 is attached to the hole bottom surface P1.

[0071] It should be noted that the diameter of the exhaust port 220 is smaller than the diameter of the support 13. In this way, when one end of the seat body 12 penetrates the exhaust port 220 and the containing space 230 to connect the cover plate 211, the support 13 is used to support the cover plate 211 and the valve body 20. At the same time, the battery pressure relief device 100 is stably connected to the cover plate 211.

[0072] Further, please refer to Figure 3 and Figure 4 , the seat body 12 includes a first seat 121 and a second seat 122, and the first seat 121 and the second seat 122 are oppositely arranged. One end of the support 13 is connected to the first seat 121, and the other end is connected to the second seat 122. The first seat 121 is located on one side of the support 13 close to the second pressure relief channel 21, and the second seat 122 is located on the other side of the support 13 away from the second pressure relief channel 21. The first seat 121 is detachably connected to the valve body 20, and the second seat 122 is detachably connected to the cover plate 211.

[0073] Specifically, in the embodiment, the first seat 121 is provided with an external thread 123 at the outer periphery, the inner wall of the second pressure relief passage 21 is provided with an internal thread 22, and the external thread 123 is threadedly connected to the internal thread 22. When the battery pressure relief device 100 needs to be cleaned, the valve seat 10 and the valve body 20 can be quickly disassembled by the threaded connection between the valve seat 10 and the valve body 20. Then, the valve body 20 and the seat body 12 are cleaned respectively, so as to ensure that the first pressure relief passage 11 and the second pressure relief passage 21 are free of impurities, thereby avoiding affecting the discharge of the gas in the box body 210. After the valve body 20 and the seat body 12 are cleaned, the valve body 20 and the seat body 12 are connected. The reusability of the battery pressure relief device 100 is improved.

[0074] In some embodiments, the second seat 122 comprises a connecting portion 124 and a guiding portion 125, one end of the connecting portion 124 is connected to the support 13, and the other end is connected to the guiding portion 125. In the embodiment, the diameter of the guiding portion 125 gradually decreases from one end of the connecting portion 124 to the direction away from the connecting portion 124.

[0075] It can be understood that the diameter of the guiding portion 125 is designed to gradually decrease from one end of the connecting portion 124 to the direction away from the connecting portion 124, and the diameter of the support 13 is greater than the diameter of the connecting portion 124. The diameter of the exhaust port 220 is equal to the diameter of the connecting portion 124. When the battery pressure relief device 100 needs to be connected to the cover plate 211, the guiding portion 125 penetrates the exhaust port 220 and the accommodating space 230, so that the connecting portion 124 is placed in the exhaust port 220. The bottom surface P1 of the hole of the support 13 abuts against the second surface P3. In this way, the second seat 122 is stably connected to the cover plate 211.

[0076] It should be noted that the valve seat 10 and the valve body 20 are both made of elastic material. On the one hand, since the second seat 122 is elastic, when the second seat 122 is placed in the exhaust port 220 to connect the cover plate 211, the elastic second seat 122 can avoid damaging the exhaust port 220. On the other hand, when the valve seat 10 and the valve body 20 are disassembled, the valve seat 10 and the valve body 20 can be prevented from being damaged. On the other hand, due to the pressure difference between the pressure in the box body 210 and the pressure outside, the valve flap 31 is prevented from being damaged when the valve flap 31 opens or closes the second pressure relief passage 21. The specific type of the elastic material is not limited in the present application. For example, the elastic material can be rubber or the like. As long as the battery pressure relief device 100 has elasticity, it is acceptable.

[0077] Figures 3 to 13When the battery pressure relief device 100 is used to relieve the pressure inside the box body 210, on the one hand, the valve core 30 is arranged in the second pressure relief channel 21, so that when it is necessary to relieve the pressure inside the box body 210, the valve core 30 separates the inner wall of the second pressure relief channel 21 to discharge the gas inside the box body 210 to the outside, and also blocks the outside air and dust from entering the box body 210. On the other hand, the valve seat 10 and the valve body 20 are detachably connected, so that when it is necessary to clean the battery pressure relief device 100, the valve seat 10 and the valve body 20 are detached and cleaned, thereby increasing the reusability of the battery pressure relief device 100. On the other hand, the inner diameter of the connecting portion 124 is smaller than the inner diameter of the guiding portion 125, so as to facilitate the installation of the battery pressure relief device 100 on the box body 210. The problem that a large amount of gas generated during the formation of the battery cannot be discharged to the outside in time, and the battery expands to affect the service life of the battery or cause safety hazards such as explosion is avoided.

[0078] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application.

Claims

1. A battery pressure relief device for relieving pressure from an interior of a battery, comprising: The valve seat is detachably connected to the valve body, the first pressure relief channel is provided in the valve seat, the second pressure relief channel is provided in the valve body, the first pressure relief channel communicates with the second pressure relief channel, the valve core is arranged in the second pressure relief channel and one end of the valve core is connected to the valve body, and the other end of the valve core is a free end, so that the end of the free end abuts against or is away from the inner wall of the valve body when subjected to external force in different axial directions.

2. The battery pressure relief device of claim 1, wherein, When the pressure difference between the pressure inside the valve body and the pressure outside the valve body is greater than or equal to 1 atm, the free end of the valve core is away from the inner wall of the valve body.

3. A battery relief device according to either one of claims 1 or 2, wherein, The maximum radial distance of the free end away from the inner wall of the valve body is at least 0.67 mm.

4. The battery pressure relief device of claim 1, wherein, The valve core comprises a valve flap, the valve flap comprises a connecting segment and a sealing segment extending from the connecting segment, the connecting segment is pivotally connected to the valve body and can rotate relative to the valve body to drive the sealing segment to swing, so that the sealing segment seals or is away from the second pressure relief channel.

5. The battery pressure relief device of claim 4, wherein the pressure relief device is configured to relieve pressure from the battery when the pressure within the battery reaches a predetermined pressure threshold. One end of the connecting segment is pivotally connected to the inner wall or the outer wall of one side of the second pressure relief channel, and the sealing segment can swing relative to the inner wall of the other side of the second pressure relief channel to seal or be away from the second pressure relief channel.

6. The battery pressure relief device of claim 4, wherein, The valve core further comprises a linkage member extending from one side of the connecting segment away from the first pressure relief channel, and the linkage member away from one side of the sealing segment is connected to the inner wall of the second pressure relief channel.

7. The battery pressure relief device of claim 4, wherein, The valve core further comprises a linkage member extending from one side of the connecting segment away from the first pressure relief channel, and a gap is formed between the linkage member away from one side of the sealing segment and the valve body, and the gap communicates with the second pressure relief channel.

8. The battery pressure relief device of claim 1, wherein, The valve seat comprises a seat body and a support member sleeved outside the seat body, the first pressure relief channel penetrates through the seat body and the support member, and the seat body is connected to the valve body.

9. The battery pressure relief device of claim 8, wherein, The seat body comprises a first seat body and a second seat body, the first seat body and the second seat body are oppositely arranged, one end of the support member is connected to the first seat body, the other end of the support member is connected to the second seat body, the first seat body is located on the side of the support member close to the second pressure relief channel, the second seat body is located on the side of the support member away from the second pressure relief channel, and the first seat body is detachably connected to the valve body.

10. A battery case characterized by comprising: The battery pressure relief device as claimed in any one of claims 1 to 9 is arranged on the box body, the box body is provided with an exhaust port, part of the battery pressure relief device penetrates into the inside of the box body through the exhaust port and communicates the inside of the box body with the first pressure relief channel and the second pressure relief channel.

11. A battery, characterized by The battery pressure relief device as claimed in any one of claims 1 to 9 is arranged on the box body, the box body is provided with an exhaust port, part of the battery pressure relief device penetrates into the inside of the box body through the exhaust port and communicates the inside of the box body with the first pressure relief channel and the second pressure relief channel. The battery pressure relief device as claimed in any one of claims 1 to 9 is arranged on the box body, the box body is provided with an exhaust port, part of the battery pressure relief device penetrates into the inside of the box body through the exhaust port and communicates the inside of the box body with the first pressure relief channel and the second pressure relief channel.

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