Explosion-proof valve and battery pack

Abstract

The anti-explosion valve comprises a valve body, a cover body and a power assembly, the valve body is provided with a first through hole, the cover body comprises a cover body and a movable shaft, the cover body is arranged on one side of the valve body, one end of the movable shaft is connected with the cover body, and the other end of the movable shaft is in sliding connection with the valve body in the first through hole. The power assembly comprises a first magnet and a second magnet which are oppositely arranged, the first magnet is connected with the valve body, and the second magnet is connected with the movable shaft; sealing and pressure relief of the anti-explosion valve are achieved through mutual repulsion of the first magnet and the second magnet; meanwhile, the magnetic piece has good durability, flexibility and safety, and is suitable for being applied to the battery pack with high requirement on long-term reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field technical field of battery, specifically relates to a kind of explosion-proof valve and battery. BACKGROUND

[0002] With the continuous development of lithium ion battery, safety is more and more concerned by society, in energy storage battery pack, cell thermal runaway is a serious safety problem, thermal runaway can cause the temperature inside cell to rise sharply, and then generate a large amount of combustible gas, if these gases cannot be discharged in time and effectively, it will cause the internal pressure of battery pack to increase sharply, and eventually may cause explosion, therefore, in order to prevent this situation from happening, usually install explosion vent on battery pack.

[0003] At present, the common explosion-proof valve design mainly has needle type explosion-proof valve and spring type explosion-proof valve, these valves realize the sealing and pressure relief of valve port through needle or spring and other elastic structures, but needle and spring and other elastic elements are prone to aging in long-term use, with the passage of time, the performance of these elastic elements will gradually decrease, resulting in that they cannot maintain the set opening valve value and air permeability at factory, and then affect the long-term reliability and safety of explosion-proof valve. SUMMARY

[0004] The embodiment of the utility model provides a kind of explosion-proof valve and battery pack, to solve or at least partially solve the deficiency of the background art.

[0005] First, the embodiment of the utility model provides a kind of explosion-proof valve, valve body, set up with first through-hole, the first through-hole passes through the valve body;

[0006] Valve cover, including cover body and movable shaft, the cover body is arranged on the side of the valve body, one end of the movable shaft is connected with the cover body, the other end of the movable shaft is slidably connected with the valve body in the first through-hole;

[0007] Power assembly, including oppositely arranged first magnet and second magnet, the first magnet is fixedly connected with the side of the valve body away from the cover body, the second magnet is fixedly connected with the side of the movable shaft away from the cover body, the magnetism of the first magnet and the magnetism of the second magnet are same, the first magnet and the second magnet have first repulsive force between them;

[0008] Wherein, when the force exerted by the internal gas pressure of the battery pack box on the cover body is less than or equal to the first repulsive force, the cover body covers the valve body;When the force exerted by the internal gas pressure of the battery pack box on the valve body is greater than the first repulsive force, the movable shaft moves towards the direction close to the valve body, and the cover body is separated from the valve body.

[0009] In an embodiment, the cover is provided with a clamping groove near one side of the valve body, and the valve body is provided with a clamping block near one side of the cover.

[0010] When the force exerted by the internal air pressure of the battery pack on the cover is less than or equal to the first repulsive force, the clamping block is engaged with the clamping block; when the force exerted by the internal air pressure of the battery pack on the valve body is greater than the first repulsive force, the clamping block is in sliding connection with the clamping block until the clamping block is separated from the clamping groove.

[0011] In an embodiment, when the force exerted by the internal air pressure of the battery pack on the cover is less than or equal to the first repulsive force, the cover and the valve body abut each other; when the force exerted by the internal air pressure of the battery pack on the valve body is greater than the first repulsive force, an air release channel is formed between the cover and the valve body, and the air release channel is in communication with the air release hole.

[0012] In an embodiment, when the force exerted by the internal air pressure of the battery pack on the cover is less than or equal to the first repulsive force, a first air release channel is formed between the cover and the valve body;

[0013] When the force exerted by the internal air pressure of the battery pack on the valve body is greater than the first repulsive force, a second air release channel is formed between the cover and the valve body, and the first air release channel and the second air release channel are both in communication with the air release hole; wherein, in the direction perpendicular to the cover, the width of the first air release channel is less than the width of the second air release channel.

[0014] In an embodiment, the valve body comprises a main body part and a filter part, the main body part is provided with an air exchange channel, the filter part is arranged inside the air exchange channel, and the filter part and the inner wall of the air exchange channel abut each other;

[0015] The first through hole penetrates the filter part, and a filter cavity is formed between the cover, the main body part and the filter part.

[0016] In an embodiment, the valve body is provided with a plurality of air release holes, and the air release holes penetrate the valve body;

[0017] The air exchange channel comprises a plurality of air exchange openings, the air exchange openings are arranged between the filter part and the main body part, and the area of the orthographic projection of the air exchange openings on the cover is greater than the area of the orthographic projection of the air release holes on the cover.

[0018] In an embodiment, the first magnet and the second magnet are both circular rings, the first magnet is welded to a side of the valve body away from the cover body, and the movable shaft penetrates the first magnet, and the second magnet is integrally formed with the movable shaft.

[0019] In an embodiment, the valve body is provided with a plurality of air release holes penetrating the valve body.

[0020] The explosion-proof valve further comprises a dustproof water-absorbing film, which is arranged at a side of the valve body away from the cover body, covers the air release holes, and the first through hole penetrates the dustproof water-absorbing film.

[0021] In an embodiment, the valve body is provided with a first sealing groove and a second sealing groove, the first sealing groove is located at a side of the valve body close to the cover body, and the second sealing groove is located at a side of the valve body away from the cover body.

[0022] The explosion-proof valve comprises a sealing member, the sealing member comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the first sealing groove, and the second sealing ring is arranged in the second sealing groove.

[0023] In a second aspect, the utility model embodiment provides a battery pack, comprising a box body, an explosion-proof valve and at least one battery, the battery is contained in the box body, the cover plate of the box body is provided with a pressure release port, and the explosion-proof valve is arranged correspondingly to the pressure release port, wherein the explosion-proof valve is the explosion-proof valve of any one of the above-mentioned embodiments.

[0024] The embodiment of the utility model has the advantages of:

[0025] The utility model embodiment provides a kind of explosion-proof valve and battery pack, the explosion-proof valve includes valve body, valve cover and power component, the valve body is provided with first through hole, the cover body includes cover body and movable shaft, the cover body is arranged at a side of the valve body, one end of the movable shaft is connected with the cover body, the other end of the movable shaft is slidably connected with the valve body in the first through hole, the power component includes first magnet and second magnet, the first magnet is connected with the valve body, the second magnet is connected with the movable shaft;The sealing and pressure release of the explosion-proof valve are realized by the mutual repulsion of the first magnet and the second magnet;Meanwhile, magnetic piece has good durability, flexibility and safety, is suitable for being applied to the battery pack of higher long-term reliability requirement. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1 A structural schematic diagram of a battery pack provided by the embodiments of the present application is shown in the figure.

[0028] Figure 2 A structural schematic diagram of an explosion-proof valve provided by the embodiments of the present application is shown in the figure.

[0029] Figure 3 An explosion schematic diagram of the explosion-proof valve provided by the embodiments of the present application is shown in the figure.

[0030] Figure 4A A structural schematic diagram of the explosion-proof valve in a sealed state provided by the embodiments of the present application is shown in the figure.

[0031] Figure 4B A structural schematic diagram of the explosion-proof valve in a pressure relief state provided by the embodiments of the present application is shown in the figure.

[0032] Figure 5A A first cross-sectional schematic diagram of B-B' in the embodiments of the present application is shown in the figure. Figure 4A

[0033] A cross-sectional schematic diagram of C-C' in the embodiments of the present application is shown in the figure. Figure 5B Figure 4B A structural schematic diagram of a valve body provided by the embodiments of the present application is shown in the figure.

[0034] Figure 6 A cross-sectional schematic diagram of D-D' in the embodiments of the present application is shown in the figure.

[0035] Figure 7 Figure 6 A structural schematic diagram of a dustproof water-absorbing film provided by the embodiments of the present application is shown in the figure.

[0036] Figure 8 A second cross-sectional schematic diagram of B-B' in the embodiments of the present application is shown in the figure.

[0037] Figure 9 A structural schematic diagram of a dustproof water-absorbing film provided by the embodiments of the present application is shown in the figure. Figure 4A

[0038] Legend of reference signs:

[0039] 1-battery pack; 11-box body; 12-explosion-proof valve;

[0040] ​​​110 - first port; 111 - cover plate; 1111 - pressure relief port; 1112 - second threaded hole; 1113 - threaded post;

[0041] 120 - air release passage; 121 - valve body; 122 - valve cover; 123 - power assembly; 124 - dustproof water absorption film; 125 - sealing element;

[0042] 1201 - first air release passage; 1202 - second air release passage;

[0043] 1210 - filter cavity; 1211 - first through hole; 1212 - air release hole; 1213 - clamping block; 1214 - main body part; 1215 - filter part; 1216 - first sealing groove; 1217 - second sealing groove;

[0044] 1221 - cover body; 1222 - movable shaft;

[0045] 1231 - first magnet; 1232 - second magnet;

[0046] 1241 - center part; 1242 - connecting part;

[0047] 1251 - first sealing ring; 1252 - second sealing ring;

[0048] 12211 - clamping groove; 12141 - air exchange passage; 12151 - first threaded hole; 12411 - second through hole;

[0049] 121411 - air exchange port. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts are within the protection scope of the utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as 'up' and 'down' are generally used for indicating the up and down in the actual use or working state of the device, and the specific is the direction of the drawing in the drawings; and 'inner' and 'outer' are used for the contour of the device.

[0051] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4A and Figure 4B ; wherein, Figure 1A structure schematic view of a battery pack provided by the utility model; Figure 2 A structure schematic view of an explosion-proof valve provided by the utility model; Figure 3 An explosion schematic view of the explosion-proof valve provided by the utility model; Figure 4A A structure schematic view of the explosion-proof valve in a sealed state provided by the utility model; Figure 4B A structure schematic view of the explosion-proof valve in a pressure relief state provided by the utility model.

[0052] In an embodiment, the battery pack 1 comprises a box body 11, an explosion-proof valve 12 and at least one battery (not shown in the figure), the box body 11 comprises a first port 110 and a containing cavity (not marked in the figure), the battery is arranged in the containing cavity of the box body 11, the box body 11 comprises a cover plate 111, the cover plate 111 covers and seals the first port 110, a pressure relief port 1111 is formed in the cover plate 111, the explosion-proof valve 12 is arranged at the pressure relief port 1111, and a gas vent hole 1212 of the explosion-proof valve 12 is communicated with the outside through the pressure relief port 1111.

[0053] The explosion-proof valve 12 is used for balancing the internal pressure of the box body 11 of the battery pack 1, the explosion-proof valve 12 comprises a valve body 121, a valve cover 122 and a power assembly 123; the valve body 121 is formed with a first through hole 1211 and a plurality of gas vent holes 1212, the first through hole 1211 and the gas vent holes 1212 all penetrate through the valve body 121, the gas vent holes 1212 are used for releasing the internal airflow of the box body 11 when the explosion-proof valve 12 is in a gas relief state, so that the air pressure in the battery pack 1 is reduced; the valve cover 122 comprises a cover body 1221 and a movable shaft 1222, the cover body 1221 is arranged at one side of the valve body 121, one end of the movable shaft 1222 is connected with the cover body 1221, the other end of the movable shaft 1222 is slidably connected with the valve body 121 in the first through hole 1211, so as to control the movement of the cover body 1221; the power assembly 123 comprises a first magnet 1231 and a second magnet 1232 arranged oppositely, the first magnet 1231 is fixedly connected with the side of the valve body 121 away from the cover body 1221, the second magnet 1232 is fixedly connected with the side of the movable shaft 1222 away from the cover body 1221, the magnetism of the first magnet 1231 is same as the magnetism of the second magnet 1232, the first magnet 1231 and the second magnet 1232 have a first repulsive force therebetween.

[0054] Specifically, the valve body 121 is fixedly connected with the cover plate 111, and the cover body 1221 is arranged on the side of the valve body 121 away from the cover plate 111, wherein: when the force applied by the internal gas pressure of the battery pack 1 box body 11 on the cover body 1221 is less than or equal to the first repulsive force, the cover body 1221 covers the air vent hole 1212; when the force applied by the internal gas pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, the movable shaft 1222 moves towards the valve body 121, the cover body 1221 moves away from the valve body 121, and the cover body 1221 is separated from the valve body 121.

[0055] It can be understood that the internal gas pressure of the battery in the box 11 increases during long-time work, and if the gas pressure cannot be discharged, the box 11 is prone to bulging, and even an explosion may eventually occur. When the internal gas pressure of the battery pack 1 box body 11 rises, due to the pressure relief port 1111 arranged on the cover plate 111 of the box 11, the airflow can flow from the inside of the box 11 to the pressure relief port 1111, and then to the explosion-proof valve 12. Due to the existence of the same repulsive force between the first magnet 1231 and the second magnet 1232, when the force applied by the internal gas pressure of the battery pack 1 box body 11 on the cover body 1221 is less than or equal to the first repulsive force, the cover body 1221 covers the air vent hole 1212, so that the explosion-proof valve 12 is in a sealed state. When the force applied by the internal gas pressure of the box 11 on the valve body 121 is greater than the first repulsive force, the force applied by the gas pressure on the valve body 121 overcomes the first repulsive force between the first magnet 1231 and the second magnet 1232. The movable shaft 1222 moves towards the valve body 121, so that the cover body 1221 moves away from the valve body 121, and the cover body 1221 is separated from the valve body 121, and then the air vent hole 1212 is opened. At this time, the airflow in the box 11 of the battery pack 1 can flow from the inside of the box 11 to the pressure relief port 1111, and then exchange with the outside through the air vent hole 1212, so that the explosion-proof valve 12 is in a pressure relief state, thereby balancing the pressure inside the battery pack 1 and maintaining the safety of the whole battery pack 1.

[0056] It should be noted that in the related art, the magnetic difference between the two magnets produces an attractive force that attracts each other, and the sealing and pressure relief of the explosion-proof valve are realized by the attractive force. The attractive force is stronger when the distance between the two magnets is closer, and decreases as the distance increases. Unlike repulsive force, attractive force is always present, even when the distance between the two magnets is far, the attractive force will still affect the opening state of the explosion-proof valve. Specifically, in the explosion-proof valve designed by using attractive force, even if the gas pressure changes slightly, the existence of attractive force still makes the explosion-proof valve maintain a certain degree of "closed state", thereby resulting in a higher response threshold of the explosion-proof valve to pressure changes, which means that the explosion-proof valve may need to exert a larger gas pressure when the gas pressure changes slightly, resulting in that the explosion-proof valve is not sensitive enough to the change of gas pressure.

[0057] It can be understood that in the present embodiment, the magnetism of the first magnet 1231 and the magnetism of the second magnet 1232 are the same, and the first repulsive force exists between the first magnet 1231 and the second magnet 1232. The sealing and pressure relief of the explosion-proof valve 12 are realized by adjusting the size of the first repulsive force and the internal gas pressure of the box body 11. According to the physical principle, the size of the first repulsive force decreases as the distance between the first magnet 1231 and the second magnet 1232 increases. Therefore, when the distance between the first magnet 1231 and the second magnet 1232 is far, the first repulsive force is relatively small, so that the explosion-proof valve 12 is more easily opened under a smaller pressure change.

[0058] Specifically, in the case where the first repulsive force is small, the threshold of the valve cover 122 to pressure change is low. For example, when the internal gas pressure of the box body 11 rises to a certain size, even if the rising amplitude is small, the force applied to the valve cover 122 may exceed the first repulsive force. In the present embodiment, the explosion-proof valve 12 has the advantage of high sensitivity, wherein the sensitivity refers to the ability of the explosion-proof valve to respond to the change of internal gas pressure. The higher the sensitivity, the faster the explosion-proof valve can be opened under a slight change of gas pressure.

[0059] In addition, when the distance between the first magnet 1231 and the second magnet 1232 is close, the first repulsive force becomes larger, and the opening threshold of the explosion-proof valve 12 (how much gas pressure is required to open the valve) also increases. That is, when the distance between the first magnet 1231 and the second magnet 1232 is close, the explosion-proof valve 12 needs a higher gas pressure to overcome the repulsive force and reach the open state. Therefore, the explosion-proof valve can maintain a closed state under a higher internal gas pressure, providing better safety.

[0060] Meanwhile, the design provided by this utility model embodiment no longer relies on elastic elements (such as pins or springs) in related technologies, but achieves sealing and pressure relief through the first repulsive force of the magnet, avoiding the risk of elastic elements aging and failing over time. Furthermore, the magnetic component has good durability, flexibility and safety, making it suitable for use in battery pack 1 where long-term reliability requirements are high.

[0061] Furthermore, the first repulsive force can be calculated using the formula: F = K × (m1 × m2) / (r2); where F represents the magnitude of the magnetic force; K is a proportionality constant that depends on the physical properties of the magnet and the magnetic properties of the material; m1 is the mass of the first magnet 1231; m2 is the mass of the second magnet 1232; and r represents the distance between the first magnet 1231 and the second magnet 1232.

[0062] It is understood that, in this embodiment, by adjusting the mass of the first magnet 1231, the mass of the second magnet 1232, and the distance between the first magnet 1231 and the second magnet 1232, the pressure value required for the explosion-proof valve 12 to open can be precisely adjusted. This means that, according to different application scenarios and requirements of the battery pack 1, the first repulsive force between the first magnet 1231 and the second magnet 1232 can be flexibly set to ensure the safety of the battery pack 1.

[0063] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4A , Figure 4B , Figure 5A and Figure 5B ;in, Figure 5A Provided for the embodiments of this utility model Figure 4A A schematic diagram of the first type of cross-section at point B-Bˋ; Figure 5B Provided for the embodiments of this utility model Figure 4B A schematic diagram of the cross-section at point C-Cˋ.

[0064] In one embodiment, the cover 1221 has a snap-fit ​​groove 12211 on the side near the valve body 121, and the valve body 121 has a snap-fit ​​block 1213 on the side near the cover 1221; wherein, when the force exerted on the cover 1221 by the internal air pressure of the battery pack 1 housing 11 is less than or equal to the first repulsive force, the snap-fit ​​block 1213 is engaged in the snap-fit ​​block 1213; when the force exerted on the valve body 121 by the internal air pressure of the battery pack 1 housing 11 is greater than the first repulsive force, the snap-fit ​​block 1213 is slidably connected to the valve body 1211 until the snap-fit ​​block 1213 separates from the snap-fit ​​groove 12211.

[0065] Specifically, when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the cover 1221 is less than or equal to the first repulsive force, the cover 1221 and the valve body 121 abut each other; when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, a gas leakage passage 120 is formed between the cover 1221 and the valve body 121, and the gas leakage passage 120 communicates with the gas leakage hole 1212, that is, the gas leakage hole 1212 is used to communicate the pressure relief port 1111 and the gas leakage passage 120.

[0066] When the force exerted by the internal air pressure of the battery pack 1 box body 11 on the cover 1221 is less than or equal to the first repulsive force, the clamping block 1213 is clamped in the clamping groove 12211, and this clamping position firmly fixes the cover 1221 on the valve body 121, so that the surfaces of the two are closely fitted to form an effective physical seal to prevent internal gas leakage; Specifically, the cover 1221 and the valve body 121 abut each other, the clamping block 1213 and the clamping groove 12211 are tightly locked by precise matching, and the surface of the clamping block 1213 close to the clamping groove 12211 is fitted with the inner wall of the clamping groove 12211, thereby eliminating gaps or spaces to avoid gas leakage, thereby ensuring that the gas leakage passage 120 between the cover 1221 and the valve body 121 is completely closed, thereby effectively preventing the gas in the box body 11 from escaping from the gas leakage passage 120, and the explosion-proof valve 12 is in a sealed state.

[0067] When the force exerted by the internal air pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, the movable shaft 1222 moves towards the valve body 121, the cover 1221 moves away from the valve body 121, and the clamping block 1213 is connected with the clamping block 1213 slidingly, until the clamping block 1213 and the clamping groove 12211 are separated; wherein the shape of the clamping block 1213 can be matched with the shape of the clamping groove 12211, so that the clamping block 1213 can slide in the clamping groove 12211, so that when the clamping block 1213 moves with the cover 1221, the damping feeling is smaller.

[0068] It can be understood that when the force applied by the internal gas pressure of the battery pack 1 box body 11 on the cover body 1221 is less than or equal to the first repulsive force, the clamping block 1213 is clamped in the clamping groove 12211, so that the cover body 1221 can be stably kept in the position opposite to the valve body 121, thereby ensuring the air flow regulating function and the sealing property of the explosion-proof valve 12; at the same time, the cover body 1221 can also be prevented from moving accidentally due to external vibration or slight pressure fluctuation, thereby ensuring the reliability of the gas pressure balance state.

[0069] Based on the above, the embodiment realizes the sealing and pressure relief of the explosion-proof valve 12 through the dual action of the magnetic force and the clamping block 1213, and when the force applied by the internal gas pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, the sealing state of the explosion-proof valve 12 can be quickly released, and the air vent hole 1212 is opened, so that the gas in the battery pack 1 box body 11 can be exchanged with the outside through the air vent hole 1212, thereby effectively reducing the pressure in the battery pack 1 and avoiding the explosion or other safety hazards caused by overpressure.

[0070] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 5A , Figure 6 and Figure 7 ; wherein, Figure 6 is a structural schematic view of a valve body provided by the embodiment of the utility model; Figure 7 is a sectional schematic view of D-D' in Figure 6 provided by the embodiment of the utility model.

[0071] In an embodiment, the valve body 121 comprises a main body part 1214 and a filter part 1215, the main body part 1214 is provided with a gas exchange channel 12141, the filter part 1215 is arranged inside the gas exchange channel 12141, and the filter part 1215 and the inner wall of the gas exchange channel 12141 abut each other; wherein the first through hole 1211 and the air vent hole 1212 both penetrate through the filter part 1215, and the filter cavity 1210 is formed among the cover body 1221, the main body part 1214 and the filter part 1215.

[0072] It can be understood that the filter part 1215 can serve as the first barrier of the explosion-proof valve 12, effectively intercepting larger particles such as stones and weeds, and preventing these larger impurities from entering the interior of the explosion-proof valve 12 and damaging the structure of the valve body 121; and by forming a filter cavity 1210 between the cover body 1221, the main body part 1214 and the filter part 1215, the gas can be subjected to preliminary filtration before entering the ventilation channel 12141, thereby improving the durability and service life of the explosion-proof valve 12 and reducing the maintenance frequency.

[0073] At the same time, by tightly abutting the filter part 1215 with the inner wall of the ventilation channel 12141, it can be ensured that the filter part can be firmly installed in the main body part 1214, improving the air tightness of the system and ensuring that the airflow passes through the filter cavity 1210 according to the set path, effectively isolating external large-particle pollutants and reducing the threat to the battery pack 1.

[0074] Specifically, the shape of the filter part 1215 can be cross-shaped, the center axis of the first through hole 1211 coincides with the center axis of the filter part 1215, and a plurality of air release holes 1212 can be uniformly distributed around the first through hole 1211; it can be understood that the filter part 1215 adopts a cross-shaped design, and the cross-shaped structure provides a larger area of filtration effect, effectively preventing larger particles from entering the system; and a plurality of air release holes 1212 are uniformly distributed around the first through hole 1211, thereby ensuring smooth gas flow while further achieving preliminary filtration of pollutants.

[0075] Further, the ventilation channel 12141 includes a plurality of ventilation openings 121411, the ventilation openings 121411 are arranged between the filter part 1215 and the main body part 1214, and the area of the orthographic projection of the ventilation openings 121411 on the cover body 1221 is greater than the area of the orthographic projection of the air release holes 1212 on the cover body 1221.

[0076] It can be understood that the embodiment sets the plurality of air vents 121411, and the air vents 121411 are located between the filter part 1215 and the main body part 1214, so that the filter part 1215 does not block the air vents 121411, thereby increasing the effective area of gas discharge, and when the explosion-proof valve 12 is in the pressure relief state, the gas in the battery pack 1 can be quickly discharged through the air vents 121411 and the gas vent hole 1212, and the battery pack 1 is prevented from being damaged due to excessive pressure; and the area of the orthographic projection of the air vent 121411 on the cover body 1221 is greater than the area of the orthographic projection of the gas vent hole 1212 on the cover body 1221, thereby effectively reducing the resistance of the gas passing through the gas vent hole 1212, making the exhaust process more smooth, and thereby improving the response speed and safety of the entire pressure relief process.

[0077] Please continue to combine Figure 1 and Figure 6 In an embodiment, the filter part 1215 is also provided with a plurality of first threaded holes 12151, the first threaded holes 12151 are arranged on one side of the gas vent hole 1212 close to the main body part 1214, the cover plate 111 is provided with a plurality of second threaded holes 1112, and the plurality of second threaded holes 1112 are arranged around the pressure relief port 1111; wherein one first threaded hole 12151 and one second threaded hole 1112 are arranged correspondingly, and the first threaded hole 12151 and the second threaded hole 1112 are internally threadedly connected with a threaded column 1113, so that the valve body 121 and the cover plate 111 are fixedly connected. It can be understood that the threaded connection connection mode is convenient and reliable, and the sealing property is reliable.

[0078] Please continue to combine Figure 1 , Figure 2 , Figure 3 and Figure 8 ; wherein, Figure 8 is a structure diagram of a dustproof water absorption film provided by the embodiment of the utility model.

[0079] In an embodiment, the explosion-proof valve 12 further comprises a dustproof water absorption film 124, the dustproof water absorption film 124 is arranged on a side of the valve body 121 away from the cover body 1221, the dustproof water absorption film 124 covers the gas vent hole 1212, and the first through hole 1211 penetrates the dustproof water absorption film 124.

[0080] Specifically, the dustproof and water absorption film 124 is arranged on the side of the filter part 1215 away from the cover body 1221, the dustproof and water absorption film 124 is fixedly connected with the filter part 1215, the dustproof and water absorption film 124 covers the air release hole 1212 and the air exchange port 1214, and desiccant is arranged on the dustproof and water absorption film 124. The desiccant can absorb the trace moisture entering through the air release hole 1212, further ensures the dry environment inside the battery pack 1, avoids the corrosion of the battery pack 1 or the risk of short circuit caused by water vapor, and prolongs the service life of the battery pack 1.

[0081] Further, the dustproof and water absorption film 124 can be petal-shaped, the dustproof and water absorption film 124 includes a center part 1241 located in the center area of the film and a connecting part 1242 located at the periphery of the center part 1241, the center part 1241 is provided with a second through hole 12411 penetrating the center part 1241, the second through hole 12411 is arranged corresponding to the first through hole 1211 and communicates with the first through hole 1211, the movable shaft 1222 sequentially penetrates the first through hole 1211 and the second through hole 12411, the center axes of the first through hole 1211 and the second through hole 12411 coincide with the center axis of the center part 1241, and the connecting part 1242 covers the air release hole 1212. The aperture of the second through hole 12411 can be equal to the aperture of the first through hole 1211.

[0082] It can be understood that the petal shape not only has good ventilation performance, but also ensures the structural stability. The center part 1241 provides the center strength of the film, and the connecting part 1242 at the periphery covers the air release hole 1212, so that the smooth airflow is discharged without affecting the protection effect. In addition, the opening size of the petal can be adjusted according to the airflow demand, so that more flexible airflow control is realized.

[0083] It can be understood that the dustproof and water absorption film 124 covers the air release hole 1212, and the desiccant is arranged on the dustproof and water absorption film 124, which effectively prevents dust, particles or rainwater outside from entering the inside of the battery pack 1. Even in harsh environments, the explosion-proof valve 12 can also work normally, avoiding the influence of external pollutants on the performance of the explosion-proof valve 12 or the damage to the use of the battery pack 1.

[0084] Please continue to combine Figure 1 , Figure 2 , Figure 3 and Figure 6; In an embodiment, the first magnet 1231 and the second magnet 1232 are both circular rings, the first magnet 1231 is welded to the valve body 121 away from the cover body 1221, and the movable shaft 1222 penetrates the first magnet 1231, and the second magnet 1232 is integrally formed with the movable shaft 1222.

[0085] Specifically, the shape of the first magnet 1231 and the shape of the second magnet 1232 both include but are not limited to one of a circular shape, a square shape, a triangular shape, a circular ring shape, or an irregular shape. In this embodiment, it is only required that the first magnet 1231 be fixedly connected to the side of the valve body 121 away from the cover body 1221, and the second magnet 1232 be fixedly connected to the movable shaft 1222. The shape of the first magnet 1231 and the shape of the second magnet 1232 are not specifically limited in this embodiment.

[0086] The manner in which the first magnet 1231 is fixedly connected to the valve body 121 includes but is not limited to one of pasting, welding, clamping, in-mold injection, or pre-embedding assembly through a mold. The manner in which the second magnet 1232 is fixedly connected to the movable shaft 1222 includes but is not limited to one of pasting, welding, clamping, in-mold injection, or pre-embedding assembly through a mold. The second magnet 1232, the movable shaft 1222, and the cover body 1221 can be integrally formed.

[0087] It can be understood that, in this embodiment, the shape of the first magnet 1231 and the shape of the second magnet 1232 are both circular rings. The geometry of the circular ring magnet causes the magnetic field to be uniformly distributed around the magnet, thereby ensuring the stability of the explosion-proof valve 12 during opening and closing. At the same time, since the movable shaft 1222 penetrates the first magnet 1231, the first repulsive force between the first magnet 1231 and the second magnet 1232 can more uniformly act on the movable shaft 1222, thereby avoiding the problems of offset or jamming of the cover body 1221 caused by uneven magnetic force, and ensuring the smoothness and reliability of the opening and closing action of the cover body 1221.

[0088] And the first magnet 1231 is fixed to the valve body 121 by welding away from the cover body 1221, thereby ensuring the position stability of the first magnet 1231. In long-term work, the first magnet 1231 fixed by welding will not loosen due to vibration or other mechanical stress, and can long-term maintain the relative position stability with the movable shaft 1222, thereby ensuring the constant opening pressure and sealing performance of the explosion-proof valve 12; The second magnet 1232, the movable shaft 1222 and the cover body 1221 can be designed integrally, which simplifies the overall structure, reduces the assembly steps, and also avoids the loosening or wear problems of the second magnet 1232 due to long-term use.

[0089] Please continue to combine Figure 1 , Figure 2 , Figure 3 , Figure 5A , Figure 6 and Figure 7 ; In an embodiment, the valve body 121 is provided with a first sealing groove 1216 and a second sealing groove 1217, the first sealing groove 1216 is located on the side of the valve body 121 close to the cover body 1221, and the second sealing groove 1217 is located on the side of the valve body 121 away from the cover body 1221; The explosion-proof valve 12 comprises a sealing element 125, the sealing element 125 comprises a first sealing ring 1251 and a second sealing ring 1252, the first sealing ring 1251 is arranged in the first sealing groove 1216, and the second sealing ring 1252 is arranged in the second sealing groove 1217.

[0090] Specifically, when the force applied by the internal gas pressure of the battery pack 1 box 11 on the cover body 1221 is less than or equal to the first repulsive force, the cover body 1221 and the first sealing ring 1251 abut each other; When the force applied by the internal gas pressure of the battery pack 1 box 11 on the valve body 121 is greater than the first repulsive force, the cover body 1221 moves away from the valve body 121, and the cover body 1221 and the first sealing ring 1251 are separated.

[0091] It can be understood that the embodiment reduces the abrasion between the valve body 121 and the cover body 1221 by arranging the cover body 1221 and the first sealing ring 1251 to abut each other, prolongs the service life of the explosion-proof valve 12, especially in the scene of frequent opening and closing, the first sealing ring 1251 can also reduce the friction damage and maintain long-term stable sealing performance; and when the force applied by the internal gas pressure of the battery pack 1 box 11 on the cover body 1221 is less than or equal to the first repulsive force, the cover body 1221 and the first sealing ring 1251 abut each other to form an effective airtight seal, so that unnecessary gas leakage of the battery pack 1 in the normal working state can be prevented, and the safety and operation stability of the battery pack 1 are further improved.

[0092] Specifically, the second sealing ring 1252 can be arranged between the valve body 121 and the cover plate 111, the second sealing ring 1252 can ensure the airtightness between the explosion-proof valve 12 and the battery pack 1 box 11, can effectively prevent gas from leaking from the joint between the valve body 121 and the battery box, and further improve the sealing performance of the entire battery pack 1; it can be understood that the second sealing ring 1252 on the side of the valve body 121 away from the cover body 1221 can act as an additional barrier, which can effectively prevent pollutants such as dust and moisture in the external air from entering the system, thereby protecting the internal environment of the battery pack 1 and prolonging the service life of the explosion-proof valve 12, especially when used in harsh environments, the system can maintain long-term stability.

[0093] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5B and Figure 9 ; wherein, Figure 9 is a second cross-sectional view of the Figure 4A provided by the embodiment of the utility model.

[0094] In an embodiment, when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the cover body 1221 is less than or equal to the first repulsive force, the clamping block 1213 is clamped in the clamping block 1213, and the surface of the clamping block 1213 close to one side of the clamping groove 12211 has a gap with the inner wall of the clamping groove 12211, so that the first air release channel 1201 is formed between the cover body 1221 and the valve body 121; when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, the second air release channel 1202 is formed between the cover body 1221 and the valve body 121, and the first air release channel 1201 and the second air release channel 1202 are in communication with the air release hole 1212; wherein, in the direction perpendicular to the cover body 1221, the width of the first air release channel 1201 is less than the width of the second air release channel 1202.

[0095] It can be understood that, by forming air release channels 120 of different widths under different air pressure conditions, the embodiment can flexibly cope with the change of the air pressure inside the battery pack 1 box body 11; specifically, when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the cover body 1221 is less than or equal to the first repulsive force, the first air release channel 1201 is formed between the cover body 1221 and the valve body 121, and the first air release channel 1201 is relatively narrow, allowing a small amount of gas to pass through to balance the air pressure inside and outside the battery pack 1 box body 11, thereby reducing the stress caused by small fluctuations in the internal air pressure of the battery pack 1 box body 11 and prolonging the service life of the system.

[0096] At the same time, when the force exerted by the internal air pressure of the battery pack 1 box body 11 on the valve body 121 is greater than the first repulsive force, the second air release channel 1202 is formed between the cover body 1221 and the valve body 121, and the width of the second air release channel 1202 is greater than the width of the first air release channel 1201, so that more gas can be quickly released, thereby effectively preventing the internal air pressure of the battery pack 1 box body 11 from rising sharply. Through this design, in the case of thermal runaway of the battery pack 1 or other emergencies, the explosion-proof valve 12 can respond quickly to ensure safety.

[0097] The above describes the embodiments of the utility model in detail, and the principle and implementation mode of the utility model are described by applying specific examples; the above embodiment description is only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the utility model.

Claims

1. An explosion relief valve, characterized in that The explosion-proof valve is used for balancing the internal air pressure of a battery pack box body, and comprises: a valve body provided with a first through hole; a valve cover comprising a cover body and a movable shaft, the cover body is arranged on one side of the valve body, one end of the movable shaft is connected with the cover body, and the other end of the movable shaft is slidably connected with the valve body in the first through hole; a power assembly comprising a first magnet and a second magnet arranged oppositely, the first magnet is fixedly connected with the side of the valve body away from the cover body, the second magnet is fixedly connected with the side of the movable shaft away from the cover body, the magnetism of the first magnet is the same as that of the second magnet, and the first magnet and the second magnet have a first repulsive force therebetween; wherein, when the force applied by the internal air pressure of the battery pack box body on the cover body is less than or equal to the first repulsive force, the cover body covers the valve body; when the force applied by the internal air pressure of the battery pack box body on the valve body is greater than the first repulsive force, the movable shaft moves towards the valve body, and the cover body is separated from the valve body.

2. The explosion relief valve of claim 1, wherein The side of the cover body close to the valve body is provided with a clamping groove, and the side of the valve body close to the cover body is provided with a clamping block; wherein, when the force applied by the internal air pressure of the battery pack box body on the cover body is less than or equal to the first repulsive force, the clamping block is clamped in the clamping groove; when the force applied by the internal air pressure of the battery pack box body on the valve body is greater than the first repulsive force, the clamping block is slidably connected with the clamping block until the clamping block is separated from the clamping groove.

3. The explosion relief valve of claim 1, wherein, When the force applied by the internal air pressure of the battery pack box body on the cover body is less than or equal to the first repulsive force, the cover body and the valve body abut against each other; when the force applied by the internal air pressure of the battery pack box body on the valve body is greater than the first repulsive force, a gas discharge channel is formed between the cover body and the valve body.

4. The explosion relief valve of claim 3, wherein When the force applied by the internal air pressure of the battery pack box body on the cover body is less than or equal to the first repulsive force, a first gas discharge channel is formed between the cover body and the valve body; When the force applied by the internal air pressure of the battery pack box body on the valve body is greater than the first repulsive force, a second gas discharge channel is formed between the cover body and the valve body; wherein, in the direction perpendicular to the cover body, the width of the first gas discharge channel is less than that of the second gas discharge channel.

5. The explosion relief valve of claim 1, wherein The valve body comprises a main body part and a filter part, the main body part is provided with a gas exchange channel, the filter part is arranged inside the gas exchange channel, and the filter part abuts against the inner wall of the gas exchange channel; wherein, the first through hole penetrates the filter part, and a filter cavity is formed between the cover body, the main body part and the filter part.

6. The explosion relief valve of claim 5, wherein, The valve body is provided with a plurality of gas discharge holes penetrating the valve body; The gas exchange channel comprises a plurality of gas exchange openings arranged between the filter part and the main body part, and the area of the orthographic projection of the gas exchange opening on the cover body is greater than that of the orthographic projection of the gas discharge hole on the cover body.

7. Explosion relief valve according to any of claims 1 to 6, characterized in that The shape of the first magnet and the shape of the second magnet are both circular ring shapes, the first magnet is welded to a side of the valve body away from the cover body, and the movable shaft penetrates the first magnet, the second magnet is integrally formed with the movable shaft.

8. Explosion relief valve according to any of claims 1 to 6, characterized in that The valve body is provided with a plurality of air release holes penetrating the valve body; The explosion-proof valve further comprises a dustproof water-absorbing film, the dustproof water-absorbing film is arranged on a side of the valve body away from the cover body, the dustproof water-absorbing film covers the air release holes, and the first through hole penetrates the dustproof water-absorbing film.

9. Explosion relief valve according to any of claims 1 to 6, characterized in that The valve body is provided with a first sealing groove and a second sealing groove, the first sealing groove is located on a side of the valve body close to the cover body, and the second sealing groove is located on a side of the valve body away from the cover body. The explosion-proof valve comprises a sealing member, the sealing member comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the first sealing groove, and the second sealing ring is arranged in the second sealing groove.

10. A battery pack, characterized by, The explosion-proof valve comprises a sealing member, the sealing member comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the first sealing groove, and the second sealing ring is arranged in the second sealing groove. The explosion-proof valve comprises a sealing member, the sealing member comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the first sealing groove, and the second sealing ring is arranged in the second sealing groove.

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