Battery pack explosion-proof valve and electric device

Abstract

The application relates to the technical field of batteries, and specifically provides a battery pack explosion-proof valve and an electric device. The battery pack explosion-proof valve comprises an explosion-proof valve body provided with a central through hole and a plurality of first air permeation holes; a piston assembly arranged at one end of the explosion-proof valve body; and a valve core assembly arranged at the other end of the explosion-proof valve body. The valve core assembly comprises a guide seat and an elastic body. One end of the guide seat is movably arranged in the central through hole and is fixedly connected with the piston assembly. The other end of the guide seat is provided with a clamping groove. The two ends of the elastic body are fixedly arranged on the end of the explosion-proof valve body away from the piston assembly, and the middle part of the elastic body is clamped on the clamping groove. The traditional through-type guide rod and spring are cancelled, the internal structure is simplified, the space occupation of the explosion-proof valve in the height direction is reduced, and the problem that the battery pack explosion-proof valve has excessively large volume occupation in the height direction in the prior art is effectively solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack explosion-proof valve and electrical equipment. Background Technology

[0002] During battery pack transportation, environmental factors such as altitude changes can cause significant internal and external pressure differences within the equipment cavity, creating a negative pressure environment. If this pressure difference cannot be balanced in time, it not only affects equipment stability but can also lead to external moisture seepage, causing internal condensation and resulting in safety risks such as insulation failure, short circuits, and even fire. Therefore, battery packs are generally equipped with explosion-proof valves for pressure relief and pressure balance to ensure safe operation.

[0003] However, existing explosion-proof valves generally adopt a traditional structure including a guide rod assembly, a piston assembly, and a spring. The guide rod assembly passes through and is movably connected to the valve body, the piston assembly is fixed to one end of the guide rod, and the spring is positioned between the guide rod and the valve body. The spring's elasticity pushes the piston against the valve body, sealing the vent hole and thus achieving the explosion-proof function. While possessing basic pressure relief performance, the overall structure is complex and occupies a significant amount of space in the height direction because the guide rod needs to pass through the spring and connect to the piston.

[0004] Therefore, existing technologies have defects and shortcomings, and need further improvement and development. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a battery pack explosion-proof valve and electrical equipment, which aims to solve the problem that the battery pack explosion-proof valve occupies a large volume in the height direction in the prior art.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: a battery pack explosion-proof valve, used to prevent battery pack explosion, comprising:

[0007] The explosion-proof valve body is provided with a central through hole and several first vent holes;

[0008] A piston assembly disposed at one end of the explosion-proof valve body;

[0009] A valve core assembly, wherein the valve core assembly is disposed at the other end of the explosion-proof valve body;

[0010] The valve core assembly includes a guide seat and an elastic body. One end of the guide seat is movably disposed in the central through hole and is fixedly connected to the piston assembly.

[0011] The other end of the guide seat is provided with a locking groove, and the two ends of the elastic body are fixedly disposed on the end of the explosion-proof valve body away from the piston assembly, and the middle part of the elastic body is engaged in the locking groove.

[0012] Optionally, the elastic body includes a first elastic element, a crossbar, and a second elastic element integrally formed; the first elastic element and the second elastic element are arranged symmetrically about the midpoint of the crossbar.

[0013] Optionally, the first elastic element includes a first fixing ring and a first elastic ring, and the second elastic element includes a second fixing ring and a second elastic ring; the first fixing ring is disposed above the first elastic ring, and the second fixing ring is disposed above the second elastic ring.

[0014] Optionally, the explosion-proof valve body is provided with a first fixing protrusion and a second fixing protrusion on the side opposite to the piston assembly. The first fixing protrusion and the second fixing protrusion are centrally symmetrically arranged on both sides of the central through hole, and the first fixing protrusion and the second fixing protrusion are respectively provided with a first fixing hole and a second fixing hole.

[0015] Optionally, the battery pack explosion-proof valve further includes a first fixing pin and a second fixing pin. The first fixing pin is used to cooperate with the first fixing hole to fix the first fixing ring on the side wall of the first fixing protrusion; the second fixing pin is used to cooperate with the second fixing hole to fix the second fixing ring on the side wall of the second fixing protrusion.

[0016] Optionally, the guide seat has a sleeve blind hole at one end away from the elastic body, and the bottom of the sleeve blind hole has several side wall holes.

[0017] Optionally, the piston assembly includes a piston cap, a magnetic suction element, a pressure ring, a venting membrane, and a piston body arranged sequentially from top to bottom; the piston cap includes a protruding end and a venting end;

[0018] The ventilated end is provided with a first recessed platform, and a second recessed platform is provided at the edge of the first recessed platform. The ventilated membrane is provided on the first recessed platform, the pressure ring is snapped onto the second recessed platform, the magnetic suction member is provided above the pressure ring and the ventilated membrane, and the magnetic suction member has a plurality of ventilated grooves. The piston body is provided with a plurality of ventilated channels corresponding to the openings of the plurality of ventilated grooves, and the piston cover is fixedly provided on the piston body.

[0019] Optionally, the protruding end is provided with a hollow protrusion, the hollow protrusion is screwed to the sleeve blind hole, and the side wall hole forms a ventilation path with the hollow protrusion, the ventilation groove, the ventilation membrane and the ventilation channel.

[0020] Optionally, the battery pack explosion-proof valve further includes:

[0021] Inner and outer sealing rings, which engage in the gap between the piston assembly and the explosion-proof valve body;

[0022] A protective sleeve is fitted onto the valve core assembly; a vent hole is provided at the bottom of the protective sleeve.

[0023] Another technical solution adopted by this application to solve the technical problem is as follows: an electrical device, which includes the battery pack explosion-proof valve as described above.

[0024] Compared with the prior art, this application provides a battery pack explosion-proof valve and electrical equipment. The battery pack explosion-proof valve has a central through hole and multiple first vent holes on its body, and a piston assembly and a valve core assembly at both ends. The valve core assembly consists of a guide seat and an elastic body. One end of the guide seat is movably disposed in the central through hole and fixedly connected to the piston assembly. The other end of the guide seat is engaged with the middle of the elastic body through a locking groove. Both ends of the elastic body are fixed to the explosion-proof valve body. By eliminating the traditional through-type guide rod and spring, the internal structure is simplified, the space occupied by the explosion-proof valve in the height direction is reduced, the clearance space is reduced, and the internal space of the battery pack is increased, effectively solving the problem of excessive volume occupation in the height direction of the battery pack explosion-proof valve in the prior art. On the other hand, the integrated linkage of the guide seat and the piston assembly ensures that the piston assembly can move along the central axis when the air pressure changes, improving the stability of the pressure relief response and the sealing reliability. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the battery pack explosion-proof valve provided in this application;

[0026] Figure 2 This is a three-dimensional exploded view of the battery pack explosion-proof valve provided in this application;

[0027] Figure 3 This is a three-dimensional exploded structural diagram of the battery pack explosion-proof valve provided in this application from another perspective.

[0028] Figure 4 This is a structural schematic diagram of the piston assembly and piston cover of the battery pack explosion-proof valve provided in this application;

[0029] Figure 5 This is a left view of the battery pack explosion-proof valve provided in this application;

[0030] Figure 6 It is provided in this application Figure 5 A sectional view along the I-I direction;

[0031] Figure 7 This is a three-dimensional structural diagram of the battery pack explosion-proof valve and protective sleeve provided in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Battery pack explosion-proof valve; 11. Explosion-proof valve body; 111. Central through hole; 112. First vent hole; 12. Piston assembly; 13. Valve core assembly; 131. Guide seat; 132. Elastic body; 1311. Engaging groove; 1321. First elastic element; 1322. Abutting crossbar; 1323. Second elastic element; 1324. First fixing ring; 1325. First elastic ring; 1326. Second fixing ring; 1327. Second elastic ring; 113. First fixing protrusion; 114. Second fixing protrusion; 1131. The first... 1132. Second fixing hole; 14. First fixing pin; 15. Second fixing pin; 1312. Sleeve blind hole; 1313. Side wall hole; 121. Piston cover; 122. Magnetic suction element; 123. Pressure ring; 124. Breathable membrane; 125. Piston body; 1211. Protruding end; 1212. Breathable end; 1213. First recessed platform; 1214. Second recessed platform; 1221. Breathable groove; 1215. Hollow protrusion; 1216. Breathable channel; 16. Inner and outer sealing rings; 17. Protective sleeve; 171. Vent hole. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Please refer to the following: Figures 1 to 7 The first embodiment of this application provides a battery pack explosion-proof valve 10, which mainly includes an explosion-proof valve body 11, a piston assembly 12, and a valve core assembly 13, wherein the valve core assembly 13 is composed of a guide seat 131 and an elastic body 132. The explosion-proof valve body 11 is provided with a central through hole 111 and a plurality of first vent holes 112. One end of the explosion-proof valve body 11 is connected to the piston assembly 12, and the other end is connected to the valve core assembly 13. The guide seat 131 is movably disposed in the central through hole 111 and fixedly connected to the piston assembly 12. The elastic body 132 is fixed to one end of the explosion-proof valve body 11 by its first fixing ring 1324 and second fixing ring 1326 respectively, and is engaged in the engagement groove 1311 of the guide seat 131 through the middle, for applying axial preload to the guide seat 131 and the piston assembly 12. The elastic body 132 is integrally formed from a first elastic element 1321, a second elastic element 1323, and a central abutment crossbar 1322. The first elastic element 1321 includes a first fixing ring 1324 and a first elastic ring 1325, and the second elastic element 1323 includes a second fixing ring 1326 and a second elastic ring 1327. The two are symmetrically arranged about the center of the abutment crossbar 1322. Stable installation is achieved by cooperating with the first fixing pin 14 and the second fixing pin 15 through the fixing holes on the first fixing protrusion 113 and the second fixing protrusion 114.

[0038] The piston assembly 12, from top to bottom, includes a piston cap 121, a magnetic chuck 122, a pressure ring 123, a venting membrane 124, and a piston body 125. The piston cap 121 has a protruding end 1211 and a venting end 1212. The protruding end 1211 is provided with a hollow protrusion 1215, and the venting end 1212 is provided with a first recess 1213 and a second recess 1214. The venting membrane 124 is located on the first recess 1213, and the pressure ring 123 is engaged with the second recess 1214 and presses down on the venting membrane 124. The magnetic chuck 122 is located above the venting membrane 124 and the pressure ring 123, and has several venting grooves 1221, corresponding to the venting channels 1216 provided in the piston body 125. The bottom of the blind socket 1312 of the guide seat 131 has multiple side wall holes 1313. The hollow protrusion 1215 is screwed to the blind socket 1312, thereby forming a continuous ventilation path inside. In addition, inner and outer sealing rings 16 are provided between the explosion-proof valve body 11 and the piston assembly 12 to ensure sealing. The valve core assembly 13 is covered with a protective sleeve 17, and a vent hole 171 is provided at its bottom to facilitate gas exchange between the inside and outside.

[0039] Under normal sealed conditions with normal internal air pressure, the elastomer 132 is fixed to the explosion-proof valve body 11 by the first fixing ring 1324 and the second fixing ring 1326 at both ends, and engages in the engagement groove 1311 of the guide seat 131 in the middle, thereby applying axial preload to the piston assembly 12. The guide seat 131 is pushed by the elastomer 132, causing it to drive the piston assembly 12 to press tightly against the inner and outer sealing rings 16 on the explosion-proof valve body 11, achieving a sealing effect. At this time, the vent membrane 124 in the piston assembly 12 is pressed against the first countersunk platform 1213 by the magnetic attractor 122 and the pressure ring 123, forming a closed state. Although the first vent 112 is closed, external gas can still flow smoothly through the vent 171, side wall hole 1313, socket blind hole 1312, hollow protrusion 1215, vent membrane 124, vent groove 1221 and vent channel 1216, so as to achieve the balance between the internal air pressure and the external air pressure.

[0040] When the internal air pressure of the battery pack abnormally rises above the preload of the elastomer 132, the high-pressure gas pushes the piston assembly 12 upwards. The elastomer 132 deforms, compressing the first elastic ring 1325 and the second elastic ring 1327, thereby causing the guide seat 131 to move the piston assembly 12 away from the explosion-proof valve body 11. Since the hollow protrusion 1215 of the guide seat 131 is screwed to the blind hole 1312, it maintains its guiding function during the pulling process. As the piston assembly 12 moves away from the inner and outer sealing rings 16, the originally closed first vent hole 112 is opened, and gas can flow directly out from the first vent hole 112 of the explosion-proof valve body 11, quickly releasing pressure through the gap between the piston assembly 12 and the body, avoiding the risk of damage caused by the continuous rise in internal air pressure of the battery pack.

[0041] Meanwhile, the breathable membrane 124 can be a waterproof and breathable microporous membrane to prevent external liquids or solid particles from entering the battery pack. Its microporous structure reduces the risk of moisture intrusion while ensuring normal gas exchange, effectively preventing condensation, short circuits, or fires in internal components. Furthermore, the presence of the microporous membrane can achieve a slow equilibrium of internal and external pressure to a certain extent, reducing the likelihood of frequent opening of the first vent 112, thereby improving the durability and reliability of the explosion-proof valve. Through the coordinated design of various structures, the battery pack explosion-proof valve 10 can operate stably under various conditions such as sealing, venting, and pressure relief, ensuring the safety of the battery system.

[0042] Please refer to the following: Figures 1 to 3In some embodiments, the battery pack explosion-proof valve 10 includes an explosion-proof valve body 11, a piston assembly 12, and a valve core assembly 13; the explosion-proof valve body 11 is provided with a central through hole 111 and a plurality of first vent holes 112; the piston assembly 12 is disposed at one end of the explosion-proof valve body 11; the valve core assembly 13 is disposed at the other end of the explosion-proof valve body 11; wherein, the valve core assembly 13 includes a guide seat 131 and an elastic body 132, one end of the guide seat 131 is movably disposed in the central through hole 111 and is fixedly connected to the piston assembly 12; the other end of the guide seat 131 is provided with a locking groove 1311, and both ends of the elastic body 132 are fixedly disposed on the end of the explosion-proof valve body 11 away from the piston assembly 12, and the middle part of the elastic body 132 is engaged in the locking groove 1311. Furthermore, by providing a central through hole 111 and multiple first vent holes 112 on the explosion-proof valve body 11, and by providing a piston assembly 12 and a valve core assembly 13 at both ends, the valve core assembly 13 is composed of a guide seat 131 and an elastic body 132. One end of the guide seat 131 is movably disposed in the central through hole 111 and fixedly connected to the piston assembly 12, while the other end of the guide seat 131 engages with the middle of the elastic body 132 through a locking groove 1311. Both ends of the elastic body 132 are fixed to the explosion-proof valve body 11, thus forming a stable and compact axially symmetrical structure. On the one hand, by eliminating the traditional through-type guide rod and spring, the internal structure is simplified, and the space occupied by the explosion-proof valve in the height direction is reduced, effectively solving the problem of excessive volume occupation in the height direction of the battery pack explosion-proof valve 10 in the prior art; on the other hand, through the integrated linkage of the guide seat 131 and the piston assembly 12, it is ensured that the piston assembly 12 can move along the central axis when the air pressure changes, improving the stability of the pressure relief response and the sealing reliability.

[0043] Please refer to the following: Figures 2 to 3 In some embodiments, the elastic body 132 includes a first elastic element 1321, abutting crossbar 1322, and a second elastic element 1323 integrally formed; the first elastic element 1321 and the second elastic element 1323 are centrally symmetrically arranged about the midpoint of the abutting crossbar 1322. Furthermore, by setting the elastic body 132 as a structure consisting of a first elastic element 1321, abutting crossbar 1322, and a second elastic element 1323 integrally formed, and symmetrically arranged about the abutting crossbar 1322, the restoring force on the guide seat 131 is ensured to be stable and balanced. This reduces the number of parts, avoids the misalignment and uneven fatigue problems caused by traditional independent springs, and improves reliability and consistency. The symmetrical structure can provide bidirectional equivalent support force, effectively improving the return accuracy of the guide seat 131 and the control accuracy of the sealing force, making the piston assembly 12 more stable during operation, which is beneficial for the rapid reset and re-sealing function of the explosion-proof valve and reduces the degradation of sealing performance after frequent pressure relief.

[0044] Please refer to the following: Figures 2 to 3 In some embodiments, the first elastic element 1321 includes a first fixing ring 1324 and a first elastic ring 1325, and the second elastic element 1323 includes a second fixing ring 1326 and a second elastic ring 1327; the first fixing ring 1324 is disposed above the first elastic ring 1325, and the second fixing ring 1326 is disposed above the second elastic ring 1327. Furthermore, by including the first fixing ring 1324 and the first elastic ring 1325 in the first elastic element 1321, and the second elastic element 1323 including the second fixing ring 1326 and the second elastic ring 1327 respectively, and placing the fixing ring above the elastic ring, it helps to achieve axial restriction and installation positioning of the elastic ring. This can prevent the elastic ring from axially displacing or fatigue deformation due to long-term compression, ensuring long-term stability of the elastic restoring force, and effectively improving the working life and sealing reliability of the entire valve core assembly 13.

[0045] Please refer to the following: Figure 2 In some embodiments, the explosion-proof valve body 11 has a first fixing protrusion 113 and a second fixing protrusion 114 on the side opposite to the piston assembly 12. The first fixing protrusion 113 and the second fixing protrusion 114 are centrally symmetrically arranged on both sides of the central through hole 111. The first fixing protrusion 113 and the second fixing protrusion 114 are respectively provided with a first fixing hole 1131 and a second fixing hole 1132. Therefore, by providing the first fixing protrusion 113 and the second fixing protrusion 114 on the side of the explosion-proof valve body 11 opposite to the piston assembly 12, and respectively providing the first fixing hole 1131 and the second fixing hole 1132, precise positioning and installation of each part of the elastic body 132 can be achieved.

[0046] Please refer to the following: Figure 2 In some embodiments, the battery pack explosion-proof valve 10 further includes a first fixing pin 14 and a second fixing pin 15. The first fixing pin 14 is used to cooperate with the first fixing hole 1131 to fix the first fixing ring 1324 to the side wall of the first fixing protrusion 113; the second fixing pin 15 is used to cooperate with the second fixing hole 1132 to fix the second fixing ring 1326 to the side wall of the second fixing protrusion 114. Furthermore, by setting the first fixing pin 14 and the second fixing pin 15 to cooperate with the fixing hole respectively, the connection rigidity between the fixing ring and the explosion-proof valve body 11 is further enhanced, enabling the entire elastomer 132 to more reliably withstand compression deformation and stably provide preload.

[0047] Please refer to the following: Figures 2 to 3In some embodiments, the guide seat 131 has a blind socket 1312 at the end opposite to the elastic body 132, and the bottom of the blind socket 1312 has several side wall holes 1313. The blind socket 1312 and the several side wall holes 1313 at the bottom of the guide seat 131, together with the subsequent hollow structure, form a breathable path, which helps to control the flow rate and direction of the gas pressure relief channel.

[0048] Please refer to the following: Figures 2 to 4 In some embodiments, the piston assembly 12 includes, from top to bottom, a piston cap 121, a magnetic absorbing element 122, a pressure ring 123, a venting membrane 124, and a piston body 125. Specifically, the pressure ring 123 may be made of iron. The piston cap 121 includes a protruding end 1211 and a venting end 1212. The venting end 1212 is provided with a first recess 1213, and a second recess 1214 is provided at the edge of the first recess 1213. The venting membrane... The piston assembly 124 is positioned on the first recessed platform 1213, the pressure ring 123 is engaged with the second recessed platform 1214, the magnetic suction member 122 is positioned above the pressure ring 123 and the breathable membrane 124, and the magnetic suction member 122 has several breathable grooves 1221. The piston body 125 has several breathable channels 1216 corresponding to the openings of the several breathable grooves 1221, and the piston cover 121 is fixedly mounted on the piston body 125. The piston assembly 12 is thus sequentially configured with the piston cover 121, magnetic suction member 122, pressure ring 123, breathable membrane 124, and piston body 125, and the recessed platform and magnetic suction structure achieve effective sealing of the membrane. This ensures that the breathable membrane 124 is stably adhered to the sealing interface under normal conditions, preventing moisture and dust from penetrating into the breathable path.

[0049] Please refer to the following: Figures 5 to 6 In some embodiments, the protruding end 1211 is provided with a hollow protrusion 1215, which is screwed to the connecting blind hole 1312. That is, the outer side wall of the hollow protrusion 1215 is threaded to the inner side wall of the connecting blind hole 1312. The side wall hole 1313 forms a ventilation path with the hollow protrusion 1215, the vent groove 1221, the vent membrane 124, and the vent channel 1216. Furthermore, by screwing the hollow protrusion 1215 to the connecting blind hole 1312, and together with the side wall hole 1313, the vent groove 1221, the vent membrane 124, and the vent channel 1216 to form a complete ventilation path, bidirectional ventilation capability of internal gas exhaust and external gas introduction is achieved. This prevents external liquids and particles from directly entering the battery cavity, ensuring the system's sealing performance.

[0050] In some embodiments, the piston assembly 12 and the guide seat 131 may employ a magnetic structure, and a rapid valve opening function can be achieved through magnetic tooling.

[0051] In some embodiments, the battery pack explosion-proof valve 10 further includes inner and outer sealing rings 16 and a protective sleeve 17; the inner and outer sealing rings 16 are engaged in the gap between the piston assembly 12 and the explosion-proof valve body 11; specifically, the inner and outer sealing rings 16 and the explosion-proof valve body 11 are integrally molded, and the explosion-proof valve body 11 is provided with an adapter groove to be fitted and installed with the inner and outer sealing rings 16; the protective sleeve 17 is sleeved on the valve core assembly 13; the bottom of the protective sleeve 17 is provided with a vent hole 171. Furthermore, by placing the inner and outer sealing rings 16 in the gap between the piston assembly 12 and the explosion-proof valve body 11, the sealing performance of the pressure relief channel in a static state is enhanced, preventing unexpected gas leakage.

[0052] A second embodiment of this application provides an electrical device that includes the battery pack explosion-proof valve described above. By integrating the battery pack explosion-proof valve into the electrical device, the device possesses multiple safety functions, including active pressure relief, differential pressure regulation, and waterproof and breathable properties. The application areas of this electrical device can include new energy batteries, energy storage, and communications.

[0053] In summary, this application provides a battery pack explosion-proof valve and an electrical device. The battery pack explosion-proof valve includes: an explosion-proof valve body having a central through hole and a plurality of first vent holes; a piston assembly disposed at one end of the explosion-proof valve body; and a valve core assembly disposed at the other end of the explosion-proof valve body. The valve core assembly includes a guide seat and an elastic body. One end of the guide seat is movably disposed in the central through hole and fixedly connected to the piston assembly. The other end of the guide seat has a locking groove. Both ends of the elastic body are fixedly disposed on the end of the explosion-proof valve body opposite to the piston assembly, and the middle portion of the elastic body engages with the locking groove. Furthermore, by setting a central through hole and multiple first vent holes on the explosion-proof valve body, and setting a piston assembly and a valve core assembly at both ends, the valve core assembly consists of a guide seat and an elastic body. One end of the guide seat is movably set in the central through hole and fixedly connected to the piston assembly, while the other end of the guide seat engages with the middle of the elastic body through a locking groove. Both ends of the elastic body are fixed to the explosion-proof valve body, thus forming a stable and compact axially symmetrical structure. On the one hand, by eliminating the traditional through-type guide rod and spring, the internal structure is simplified, and the space occupied by the explosion-proof valve in the height direction is reduced, effectively solving the problem of excessive volume occupation in the height direction of the battery pack explosion-proof valve in the prior art, reducing the clearance space, and making the internal space of the battery pack larger. On the other hand, through the integrated linkage of the guide seat and the piston assembly, it is ensured that the piston assembly can move along the central axis when the air pressure changes, improving the stability of the pressure relief response and the sealing reliability.

[0054] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery pack explosion-proof valve for preventing battery pack explosion, characterized in that, The battery pack explosion-proof valve includes: The explosion-proof valve body is provided with a central through hole and several first vent holes; A piston assembly disposed at one end of the explosion-proof valve body; A valve core assembly, wherein the valve core assembly is disposed at the other end of the explosion-proof valve body; The valve core assembly includes a guide seat and an elastic body. One end of the guide seat is movably disposed in the central through hole and is fixedly connected to the piston assembly. The other end of the guide seat is provided with a locking groove, and the two ends of the elastic body are fixedly disposed on the end of the explosion-proof valve body away from the piston assembly, and the middle part of the elastic body is engaged in the locking groove.

2. The battery pack explosion-proof valve according to claim 1, characterized in that, The elastic body includes a first elastic element, a crossbar, and a second elastic element integrally formed; the first elastic element and the second elastic element are arranged symmetrically about the midpoint of the crossbar.

3. The battery pack explosion-proof valve according to claim 2, characterized in that, The first elastic element includes a first fixing ring and a first elastic ring, and the second elastic element includes a second fixing ring and a second elastic ring; the first fixing ring is disposed above the first elastic ring, and the second fixing ring is disposed above the second elastic ring.

4. The battery pack explosion-proof valve according to claim 3, characterized in that, The explosion-proof valve body has a first fixing protrusion and a second fixing protrusion on the side opposite to the piston assembly. The first fixing protrusion and the second fixing protrusion are centrally symmetrically arranged on both sides of the central through hole. The first fixing protrusion and the second fixing protrusion are respectively provided with a first fixing hole and a second fixing hole.

5. The battery pack explosion-proof valve according to claim 4, characterized in that, The battery pack explosion-proof valve also includes a first fixing pin and a second fixing pin. The first fixing pin is used to cooperate with the first fixing hole to fix the first fixing ring on the side wall of the first fixing protrusion; the second fixing pin is used to cooperate with the second fixing hole to fix the second fixing ring on the side wall of the second fixing protrusion.

6. The battery pack explosion-proof valve according to claim 4, characterized in that, The guide seat has a sleeve blind hole at one end away from the elastic body, and the bottom of the sleeve blind hole has several side wall holes.

7. The battery pack explosion-proof valve according to claim 6, characterized in that, The piston assembly includes, from top to bottom, a piston cap, a magnetic element, a pressure ring, a breathable membrane, and a piston body; the piston cap includes a protruding end and a breathable end. The ventilated end is provided with a first recessed platform, and a second recessed platform is provided at the edge of the first recessed platform. The ventilated membrane is provided on the first recessed platform, the pressure ring is snapped onto the second recessed platform, the magnetic suction member is provided above the pressure ring and the ventilated membrane, and the magnetic suction member has a plurality of ventilated grooves. The piston body is provided with a plurality of ventilated channels corresponding to the openings of the plurality of ventilated grooves, and the piston cover is fixedly provided on the piston body.

8. The battery pack explosion-proof valve according to claim 7, characterized in that, The protruding end is provided with a hollow protrusion, which is screwed to the sleeve blind hole. The side wall hole, the hollow protrusion, the air groove, the air membrane and the air channel form an air passage.

9. The battery pack explosion-proof valve according to claim 7, characterized in that, The battery pack explosion-proof valve also includes: Inner and outer sealing rings, which engage in the gap between the piston assembly and the explosion-proof valve body; A protective sleeve is fitted onto the valve core assembly; a vent hole is provided at the bottom of the protective sleeve.

10. An electrical appliance, characterized in that, The electrical equipment includes the battery pack explosion-proof valve as described in any one of claims 1 to 9.

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