Explosion-proof valve, battery pack and electric equipment

Abstract

The embodiment of the invention provides an anti-explosion valve, a battery pack and electric equipment, and relates to the technical field of battery packs, the anti-explosion valve comprises a valve body, an air inlet and a first exhaust port, the valve body is internally provided with a mounting cavity, and the valve body is provided with an air inlet and a first exhaust port which are communicated with the mounting cavity; the adjusting assembly comprises a plugging piece and a limiting piece, the plugging piece is located at the first exhaust port and used for closing or opening the first exhaust port, one end of the limiting piece is connected with the plugging piece, and the other end of the limiting piece extends into the mounting cavity; the elastic piece is located in the mounting cavity, and the elastic piece is configured to apply pre-tightening force in the first direction to the limiting piece when the air pressure of the air inlet is smaller than the preset air pressure, so that the blocking piece closes the first exhaust port; and the driving assembly comprises a driving part, and the driving part is configured to drive the limiting part to move in the second direction opposite to the first direction when the air pressure of the air inlet is larger than or equal to the preset air pressure, so that the blocking part opens the first exhaust port, the exhaust pressure of the anti-explosion valve is effectively controlled, and air is prevented from being accumulated in the battery pack.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to an explosion-proof valve, a battery pack and electrical equipment. Background Art

[0002] Spring-type explosion-proof valves are often used in battery packs due to their high reuse rate and low cost. Spring-type explosion-proof valves generally include valve body, spring, fixed seat, guide shaft and other components. The fixed seat is used to close or open the exhaust port on the valve body, the spring is used to provide preload force for the fixed seat, and the guide shaft limits the moving path of the fixed seat. When the air pressure in the battery pack does not reach the exhaust pressure, the spring tightens the fixed seat to close the exhaust port. When the pressure in the battery pack reaches the exhaust pressure, the fixed seat overcomes the preload force of the spring under the push of the gas and moves to open the exhaust port for exhaust.

[0003] This structure requires the joint action of the spring, the fixing seat, the guide shaft and other components to open the spring-type explosion-proof valve. Affected by the performance or size of the spring, the fixing seat and the guide shaft, even the explosion-proof valves of the same batch have large deviations in opening pressure, which may result in the inability to quickly and accurately identify the pressure changes in the battery pack, causing the first exhaust port to open slowly, which can easily lead to gas accumulation in the battery pack and increase the probability of battery pack explosion. Summary of the invention

[0004] The embodiments of the present application provide an explosion-proof valve, a battery pack, and an electrical device, so as to achieve the effect of automatically opening the explosion-proof valve to release pressure when the air pressure in the battery pack reaches a preset pressure.

[0005] A first aspect of an embodiment of the present application provides an explosion-proof valve, comprising:

[0006] A valve body, wherein a mounting cavity is provided inside, and an air inlet and a first air outlet communicated with the mounting cavity are provided on the valve body;

[0007] An adjustment component, comprising a blocking member and a limiting member, wherein the blocking member is located at the first exhaust port and is used to close or open the first exhaust port, wherein one end of the limiting member is connected to the blocking member and the other end extends into the installation cavity, and the limiting member can move along the extension direction of the installation cavity to drive the blocking member to open or close the first exhaust port;

[0008] an elastic member, located in the installation cavity, the elastic member being in contact with the limiting member, and the elastic member being configured to apply a pre-tightening force in a first direction to the limiting member when the air pressure at the air inlet is less than a preset air pressure, so that the blocking member closes the first exhaust port;

[0009] A drive assembly includes a drive member, which is located in the installation cavity. The drive member is configured to drive the limit member to move along a second direction opposite to the first direction when the air pressure at the air inlet is greater than or equal to the preset air pressure, so that the blocking member opens the first exhaust port.

[0010] In some possible designs, the driving assembly further includes a trigger electrode, which is at least partially inserted into the driving member, and the trigger electrode is configured to generate heat to drive the limit member to move through the driving member when the air pressure at the air inlet is greater than the preset air pressure.

[0011] In some possible designs, the driver includes an explosive.

[0012] In some possible designs, the drive assembly further includes a piezoelectric sensor, a detection end of the piezoelectric sensor faces the air inlet to detect the real-time air pressure of the air inlet, and the trigger electrode is electrically connected to the piezoelectric sensor.

[0013] In some possible designs, a base is provided at one end of the limiting member away from the blocking member, a limiting portion is provided at one end of the installation cavity close to the blocking member, one end of the elastic member contacts the limiting portion, and the other end contacts the base.

[0014] In some possible designs, the elastic member is a first spring, and the first spring is sleeved on the outside of the limiting member.

[0015] In some possible designs, a first positioning portion is provided on the limit member, and a second positioning portion is provided on the inner wall of the installation cavity. The first positioning portion is configured to contact the second positioning portion when the blocking member opens the first exhaust port to limit the position of the limit member in the installation cavity.

[0016] In some possible designs, one of the first positioning portion and the second positioning portion is a positioning groove, and the other is a positioning pin that cooperates with the positioning groove. An installation groove is provided on the inner wall of the limiting member or the installation cavity, and the positioning pin at least partially extends into the installation groove. The positioning pin is connected to the bottom of the installation groove through a second spring.

[0017] In some possible designs, a positioning boss is provided in the installation cavity, the base is overlapped on the positioning boss, and the driving member is located between the limiting member and an end of the installation cavity away from the blocking member.

[0018] In some possible designs, the valve body has a first gas channel arranged in a ring outside the installation cavity, the first gas channel is connected to the air inlet, at least one first air inlet hole is provided on the cavity wall of the installation cavity, the first air inlet hole connects the first gas channel and the installation cavity, a first exhaust gap is provided between the installation cavity and the limit member, and the first exhaust gap is connected to the first exhaust port.

[0019] In some possible designs, the valve body has a first sealing groove surrounding the outside of the first exhaust port, a first sealing ring is arranged in the first sealing groove, and the first sealing ring is used to abut against the blocking member to close the first exhaust port.

[0020] In some possible designs, the valve body also includes a first body and a second body connected to each other, the outer diameter of the first body is larger than the outer diameter of the second body, the first exhaust port is arranged at an end of the first body away from the second body, the air inlet is arranged at an end of the second body away from the first body, the first body has a second sealing groove near one end of the second body, and a second sealing ring is arranged in the second sealing groove.

[0021] In some possible designs, the second body is provided with external threads so as to be connected to the battery pack via the external threads.

[0022] In some possible designs, the valve body also includes a limiting cavity, which is arranged in a vertical relationship with the installation cavity, and a second exhaust port is arranged at one end of the limiting cavity away from the installation cavity, the blocking member is located in the limiting cavity, and a second gas channel is formed between the blocking member and the cavity wall of the limiting cavity, and when the pressure at the air inlet is greater than the preset air pressure, the second gas channel connects the first exhaust port and the second exhaust port.

[0023] In some possible designs, the limiting member passes through the blocking member and is threadedly connected to the blocking member.

[0024] In some possible designs, a waterproof breathable membrane is provided at one end of the blocking member facing away from the installation cavity, a third gas channel is provided on the limiting member, one end of the third gas channel is connected to the waterproof breathable membrane, a second air inlet is provided on the limiting member, and the second air inlet connects the installation cavity and the second gas channel.

[0025] In some possible designs, a cover plate is further included, wherein the cover plate is arranged above the second exhaust port and has a second exhaust gap between the cover plate and the second exhaust port, a connecting portion is arranged on the cover plate, a connecting groove is arranged at one end of the sealing member facing away from the limiting member, the connecting portion is connected to the connecting groove, the waterproof breathable membrane is located between the cover plate and the sealing member, and the connecting portion is arranged on the outside of the waterproof breathable membrane, a third exhaust gap is arranged on the connecting portion, and the third exhaust gap connects the waterproof breathable membrane and the second exhaust gap.

[0026] A second aspect of an embodiment of the present application provides a battery pack, comprising a battery pack body and at least one explosion-proof valve as described in any one of the first aspects, wherein the explosion-proof valve is mounted on the battery pack body.

[0027] A third aspect of an embodiment of the present application provides an electrical device, comprising a device body and the battery pack described in the second aspect, wherein the battery pack is mounted on the device body.

[0028] In the battery valve, battery pack and electrical equipment provided in the embodiments of the present application, the battery valve is provided with a valve body, an adjusting component, an elastic member and a driving component, and the adjusting component includes a blocking member and a limiting member, the blocking member is used to control the opening and closing of the first exhaust port on the valve body, and the limiting member is used to connect with the driving component and the elastic member, wherein the elastic member is used to apply a first reverse pre-tightening force to the limiting member when the air pressure in the battery pack is less than the preset air pressure, and the blocking member is pulled by the limiting member so that the blocking member is pressed against the first exhaust port, thereby closing the first exhaust port of the explosion-proof valve, and the driving component can obtain the air pressure of the air inlet in real time. When the air pressure at the air inlet is greater than or equal to the preset air pressure, the driving member will drive the limiting member to overcome the pre-tightening force provided by the elastic member and move in a second direction opposite to the first direction, so that when the blocking member reaches the preset air pressure, the first exhaust port is quickly opened for pressure relief, so that the air pressure in the battery pack is quickly consistent with the external air pressure, avoiding gas accumulation in the battery pack, thereby reducing the probability of battery pack explosion and improving the safety of battery pack use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] Figure 1 A schematic structural diagram of the explosion-proof valve in the closed valve state provided in an embodiment of the present application;

[0031] Figure 2 for Figure 1 A structural schematic diagram of the explosion-proof valve in the open valve state;

[0032] Figure 3A schematic structural diagram of a first positioning portion and a second positioning portion in an explosion-proof valve provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 100-valve body; 110-first exhaust port; 120-air inlet; 130-installation cavity; 131-first air inlet hole; 132-second positioning portion; 133-limiting portion; 134-positioning boss; 140-first gas channel; 150-first main body; 151-limiting cavity; 160-second main body; 170-first sealing groove; 171-first sealing ring; 180-second sealing groove; 181-second sealing ring; 190-second exhaust port;

[0035] 200-adjusting assembly; 210-blocking member; 220-limiting member; 221-base; 222-second air inlet hole; 223-first positioning portion; 224-third gas channel; 225-installation groove; 226-second spring; 227-first exhaust gap; 230-connecting groove;

[0036] 300-elastic parts;

[0037] 400 - driving assembly; 410 - driving member; 420 - triggering electrode; 430 - piezoelectric sensor;

[0038] 500- second gas channel;

[0039] 600- waterproof breathable membrane;

[0040] 700 - cover plate; 710 - connection portion; 720 - third exhaust gap; 730 - second exhaust gap.

[0041] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] At present, spring-loaded explosion-proof valves are basically passive valve opening. Specifically, spring-loaded explosion-proof valves generally include valve body, spring, fixed seat, guide shaft and other components. The fixed seat is used to close or open the exhaust port on the valve body, the spring is used to provide preload force for the fixed seat, and the guide shaft limits the moving path of the fixed seat. When the air pressure in the battery pack does not reach the exhaust pressure, the spring tightens the fixed seat to close the exhaust port. When the pressure in the battery pack reaches the exhaust pressure, the fixed seat overcomes the preload force of the spring and moves under the push of the gas, opening the exhaust port for exhaust.

[0044] The opening of a spring-type explosion-proof valve requires the joint action of the spring, the fixing seat, the guide shaft and other components. If the spring preload is insufficient, or the fixing seat and the guide shaft have size deviations, even the same batch of explosion-proof valves will have large deviations in the opening pressure, which is difficult to avoid. Therefore, the opening pressure of existing spring-type explosion-proof valves is generally not an exact value, but a range value, and as the opening pressure increases, the difference between the upper limit and the lower limit of this range value gradually increases.

[0045] If a single cell in the battery pack experiences thermal runaway, the pressure in the battery pack will increase instantly, and it is generally necessary to quickly discharge the gas in the battery pack at a certain pressure, such as 10MPa. However, such a spring-loaded explosion-proof valve cannot quickly and accurately identify the pressure changes in the battery pack, and may not be able to quickly open the valve to exhaust gas, which is very likely to cause gas to accumulate in the battery pack, increasing the risk of battery explosion.

[0046] In this regard, an embodiment of the present application provides an explosion-proof valve, a battery pack and an electrical device. A driving component is provided in the valve body of the explosion-proof valve. The driving component can accurately control the sealing component to open the first exhaust port on the valve body under a preset air pressure to release pressure according to the air pressure in the battery pack, thereby avoiding gas accumulation in the battery pack, thereby improving the safety of the battery pack and the electrical equipment using the battery pack.

[0047] It can be understood that the explosion-proof valve provided in the embodiment of the present application can be applied not only to battery packs, but also to other equipment with similar pressure relief requirements as battery packs, and this embodiment does not limit it here.

[0048] In addition, the battery pack provided in the embodiments of the present application can be applied to industrial automation, automotive electronics, renewable energy, communication equipment, medical equipment, aerospace, lighting systems and other fields, and the embodiments of the present application are not limited thereto.

[0049] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] See also Figure 1 and Figure 2 As shown, in some embodiments, the explosion-proof valve includes a valve body 100 , an adjustment assembly 200 , an elastic member 300 and a drive assembly 400 .

[0051] The valve body 100 is provided with a mounting cavity 130 inside, and an air inlet 120 and a first exhaust port 110 are also provided on the valve body 100. The air inlet 120 and the first exhaust port 110 are both connected to the mounting cavity 130 to form a gas channel, so that the gas in the battery pack enters the valve body 100 through the air inlet 120 and is discharged from the valve body 100 through the first exhaust port 110. The adjustment assembly 200 includes a blocking member 210 and a limiting member 220. The blocking member 210 is located at the first exhaust port 110 and is used to close or open the first exhaust port 110. One end of the limiting member 220 is connected to the blocking member 210, and the other end extends into the mounting cavity 130. The limiting member 220 can move along the extension direction of the mounting cavity 130 to drive the blocking member 210 to open or close the first exhaust port 110. The elastic member 300 is located in the installation cavity 130. The elastic member 300 contacts the limiting member 220 and is used to apply a preload force in a first direction to the limiting member 220 when the air pressure at the air inlet 120 is less than the preset air pressure, so that the blocking member 210 closes the first exhaust port 110. That is, when the air pressure in the battery pack is normal, the blocking member 210 can be controlled by the elastic member 300 to close the first exhaust port 110 to prevent external water or gas from entering the battery pack through the valve body 100. The driving assembly 400 includes a driving member 410. The driving member 410 is located in the installation cavity 130. When the air pressure at the air inlet 120 is greater than or equal to the preset air pressure, the driving member 410 will overcome the preload force provided by the elastic member 300 and drive the limiting member 220 to move in a second direction opposite to the first direction, so that the blocking member 210 opens the first exhaust port 110 for pressure relief.

[0052] The driving assembly 400 may include a sensor capable of detecting the air pressure of the air inlet 120. When the air pressure of the air inlet 120 reaches a preset pressure, the driving member 410 may directly drive the limiter 220 to move. The limiter 220 moves along the installation cavity 130, so that the limiter 133 not only has the function of pushing the blocking member 210 to move, but also can limit the moving path through the installation cavity 130 to prevent the blocking member 210 from tilting.

[0053] The preset air pressure can be determined according to usage conditions rather than being a fixed value, and this embodiment does not limit it.

[0054] When the valve body 100 is installed on the battery pack, if the internal air pressure of the battery pack is normal and always less than the preset air pressure, the driving member 410 will not move, and the elastic member 300 can tighten the limiter 220, so that the limiter 220 drives the blocking member 210 to keep the first exhaust port 110 closed, preventing external liquids and other substances from entering the battery pack. If a single battery in the battery pack has thermal runaway, when the air pressure reaches the preset pressure, the driving member 410 will immediately drive the limiter 220 to move, so that the blocking member 210 opens the first exhaust port 110, thereby accurately controlling the exhaust pressure of the explosion-proof valve, so that the exhaust pressure is not affected by the deviation of the component size, so as to avoid gas accumulation in the battery pack.

[0055] In some embodiments, the driving assembly 400 further includes a trigger electrode 420 , which is at least partially inserted into the driving member 410 . The trigger electrode 420 is used to generate heat to drive the limit member 220 to move through the driving member 410 when the air pressure at the air inlet 120 is greater than a preset air pressure.

[0056] Exemplarily, the driving member 410 can be a high-pressure gas cylinder, which is provided with a valve and a thermistor. The thermistor is in contact with the trigger electrode 420. The thermistor is deformed at the moment when the trigger electrode 420 heats it, and the deformation directly pushes the valve to open, thereby opening the high-pressure gas cylinder, causing the high-pressure gas in the high-pressure gas cylinder to instantly flow into the space between the limit member 220 and the installation cavity 130, thereby immediately pushing the limit member 220 to move in the second direction, so that the first exhaust port 110 is opened for exhaust.

[0057] Exemplarily, the driving member 410 may include explosives, which may be wrapped by a protective film, or a groove may be opened at the bottom of the limiting member 220 to load the explosives into the groove, or a portion for placing the explosives may be added to the wall of the installation cavity 130, or the explosives may be directly placed in the installation cavity 130. As long as the explosives are located at the end of the limiting member 220 away from the blocking member 210, the triggering electrode 420 extends into the interior of the explosive. Once the triggering electrode 420 heats up, the explosives can be instantly detonated, thereby using the energy generated by the explosion of the explosives to push the limiting member 220 to move quickly, so that the blocking member 210 immediately opens the first exhaust port 110.

[0058] Among them, the explosives are mainly selected from chemical substances that react quickly at high temperature and in a short time and can generate a large amount of energy. For example, ammonium nitrate (NH4NO3) and sodium azide (NaN3) can be used as explosives in airbags. Such explosives can not only react in a short time, but also produce a large amount of gas after the reaction, which can assist in pushing the limiter 220 to move.

[0059] Taking the use of NaN3 in an explosion-proof valve as an example, the energy released by the explosion of NaN3 and the large amount of nitrogen produced can generate sufficient thrust to instantly push the blocking member 210 to open the first exhaust port 110.

[0060] Compared with the existing spring-type explosion-proof valve, the first exhaust port 110 is opened with the assistance of explosives. The energy generated by the explosives can provide a greater driving force for the limit member 220, so that a larger gap is generated between the blocking member 210 and the first exhaust port 110, which means that after the blocking member 210 opens the first exhaust port 110, the exhaust rate is faster.

[0061] It is understandable that the amount of explosives in the explosion-proof valve can be determined according to actual conditions, so as to be able to push the limit member 220 to move without damaging other components of the explosion-proof valve and components in the battery pack. Generally speaking, an amount of explosives of 0.5-1g can meet the use requirements of most explosion-proof valves. This is just an example for illustration, not a limitation.

[0062] Of course, the end of the installation cavity 130 away from the blocking member 210 is closed, so that when the explosives explode to generate high-pressure gas or the high-pressure gas cylinder releases gas, the gas is prevented from leaving the installation cavity 130. The end of the stopper 220 away from the blocking member 210 is also preferably sealed and connected to the wall of the installation cavity 130, or only has a very small gap.

[0063] In some embodiments, the driving assembly 400 further includes a piezoelectric sensor 430 , the detection end of the piezoelectric sensor 430 faces the air inlet 120 to detect the real-time air pressure of the air inlet 120 , and the trigger electrode 420 is electrically connected to the piezoelectric sensor 430 .

[0064] The piezoelectric sensor 430 is a sensor made by utilizing the piezoelectric effect generated when certain dielectrics are subjected to force. The piezoelectric effect refers to the phenomenon that certain dielectrics generate electric charges on their surfaces when subjected to pressure to a certain degree. This is well known to those skilled in the art and will not be described in detail in this embodiment.

[0065] When the piezoelectric sensor 430 detects that the air pressure at the air inlet 120 reaches a preset pressure, a current is generated, which is transmitted to the trigger electrode 420, causing the trigger electrode 420 to heat up, thereby causing the explosive to explode and push the limiter 220 to move. In this way, the explosive can be detonated through the piezoelectric sensor 430 and the trigger electrode 420 without setting up an additional circuit, making the overall structure of the explosion-proof valve relatively simple.

[0066] In some embodiments, a base 221 is provided at one end of the stopper 220 away from the blocking member 210, a limit portion 133 is provided at one end of the installation cavity 130 close to the blocking member 210, one end of the elastic member 300 contacts the limit portion 133, and the other end contacts the base 221. Thus, the elastic member 300 can be supported by the base 221 and the limit portion 133.

[0067] Exemplarily, the elastic member 300 may be a plurality of spring sheets arranged side by side, one end of the spring sheet is connected to the limiting portion 133 , and the other end is connected to the base 221 .

[0068] Exemplarily, the elastic member 300 can be a first spring, which is sleeved outside the limiting member 220. The first spring can provide a pre-tightening force for the limiting member 220 so that it pulls the blocking member 210 to close the first exhaust port 110, and can also limit the position of the first spring through the limiting member 220 so that it only deforms in the extension direction of the installation cavity 130.

[0069] In some embodiments, see Figure 3 As shown, a first positioning portion 223 is provided on the limiting member 220, and a second positioning portion 132 is provided on the inner wall of the mounting cavity 130. The first positioning portion 223 is used to contact the second positioning portion 132 when the blocking member 210 opens the first exhaust port 110 to limit the position of the limiting member 220 in the mounting cavity 130.

[0070] That is, when the driving member 410 pushes the limiting member 220 to move, the second positioning portion 132 will move with the limiting member 220. When the second positioning portion 132 moves to the position of the first positioning portion 223 and contacts the first positioning portion 223, the first positioning portion 223 cooperates with the second positioning portion 132, so that the limiting portion 133 no longer moves relative to the installation cavity 130, so that the sealing member 210 can maintain the state of opening the first exhaust port 110, thereby continuously discharging the gas in the battery pack, balancing the air pressure inside and outside the battery pack, and reducing the risk of explosion.

[0071] In some embodiments, see Figure 3 As shown, one of the first positioning portion 223 and the second positioning portion 132 is a positioning groove, and the other is a positioning pin matched with the positioning groove.

[0072] Taking the first positioning portion 223 as a positioning groove and the second positioning portion 132 as a positioning pin as an example, one or more positioning grooves are provided on the inner wall of the mounting cavity 130, and one or more mounting grooves 225 are provided on the outer wall of the stopper 220 or the side of the base 221. The position of the mounting groove 225 is adapted to the position of the positioning groove. The positioning pin at least partially extends into the mounting groove 225, and a second spring 226 is provided in the mounting groove 225. One end of the second spring 226 is connected to the positioning pin, and the other end is connected to the bottom of the mounting groove 225. When there is no thermal runaway of the battery cell, the positioning pin is squeezed by the inner wall of the installation cavity 130 and retracts into the installation groove 225. When there is thermal runaway of the battery cell, the limiting member 220 moves in the first direction, so that the positioning pin gradually moves to the position of the positioning groove. When the positioning pin is opposite to the positioning groove, the positioning pin will move directly toward the outside of the installation groove 225 under the action of the second spring 226 and be inserted into the positioning groove, thereby limiting the position of the limiting member 220 by the positioning pin and the positioning groove, ensuring that the first exhaust port 110 is always in an open state.

[0073] In some embodiments, a positioning boss 134 is disposed in the installation cavity 130 , the base 221 is overlapped on the positioning boss 134 , and the driving member 410 is located between the limiting member 220 and an end of the installation cavity 130 away from the blocking member 210 .

[0074] The positioning boss 134 can limit the limiting member 220 to the deepest position in the installation cavity 130 to prevent the limiting member 220 from squeezing the explosive, thereby preventing the explosive from accidentally exploding.

[0075] In some embodiments, Figure 1 As shown, the installation cavity 130 can be closed at one end away from the sealing member 210, and the piezoelectric sensor 430 is fixed at this end of the installation cavity 130. The outer diameter of the limit member 220 is smaller than the inner diameter of the installation cavity 130, and only the outer diameter of the base 221 is adapted to the outer diameter of the installation cavity 130. The limit portion 133 is located at one end of the installation cavity 130 close to the first exhaust port 110, and the limit portion 133 can be set to be annular, and its inner diameter is adapted to the outer diameter of the limit member 220, leaving only a very small gap between the two as the first exhaust gap 227.

[0076] The valve body 100 has a first gas channel 140 arranged in a ring outside the installation cavity 130, the first gas channel 140 is connected to the air inlet 120, at least one first air inlet hole 131 is provided on the cavity wall of the installation cavity 130, the first air inlet hole 131 connects the first gas channel 140 and the installation cavity 130, and the first exhaust gap 227 is connected to the first exhaust port 110.

[0077] When the first exhaust port 110 is opened, the gas in the battery pack enters the first gas channel 140 through the air inlet 120 , then enters the installation cavity 130 through the first air inlet 120 , and then reaches the first exhaust port 110 from the first exhaust gap 227 , and is discharged through the first exhaust port 110 .

[0078] Among them, the size of the first exhaust gap 227 should not be too large. By connecting the first exhaust port 110 and the installation cavity 130 through such a first exhaust gap 227, exhaust and pressure relief can be performed, and external liquid can be prevented from entering the installation cavity 130 through the first exhaust gap 227, thereby preventing external liquid from flowing back into the battery pack, which has a protective effect on the battery pack.

[0079] It is understandable that the first exhaust gap 227 may be omitted, and a third air inlet hole may be provided at one end of the installation cavity 130 close to the first exhaust port 110. When the first exhaust port 110 is opened, the gas directly passes through the third air inlet hole to reach the first exhaust port 110. However, in this way, external fluid can easily flow back into the installation cavity 130.

[0080] In some embodiments, the valve body 100 has a first sealing groove 170 surrounding the outside of the first exhaust port 110 . A first sealing ring 171 is disposed in the first sealing groove 170 . The first sealing ring 171 is used to abut against the blocking member 210 to close the first exhaust port 110 .

[0081] The first sealing ring 171 can be made of rubber or other materials that can produce elastic deformation. When the sealing member 210 is squeezed on the first sealing ring 171, the first sealing ring 171 can be deformed, thereby sealing the gap between the sealing member 210 and the first sealing ring 171 to prevent external fluid from entering the interior of the valve body 100 through the first exhaust port 110.

[0082] In some embodiments, the valve body 100 also includes a first body 150 and a second body 160 that are interconnected. The first body 150 and the second body 160 can be integrally formed. The outer diameter of the first body 150 is greater than the outer diameter of the second body 160. The first exhaust port 110 is arranged at an end of the first body 150 that is away from the second body 160, and the air inlet 120 is arranged at an end of the second body 160 that is away from the first body 150. The first body 150 has a second sealing groove 180 at one end close to the second body 160, and a second sealing ring 181 is arranged in the second sealing groove 180.

[0083] Specifically, the first gas channel 140 and the mounting cavity 130 can be arranged in the second body 160, and the limiting portion 133 is located in the first body 150, or at the connection between the first body 150 and the second body 160, and the limiting member 220 extends through the first body 150 to the second body 160. The second body 160 is used to connect with the battery pack, and it can be inserted into the outer shell of the battery pack. After the second body 160 is inserted into the outer shell of the battery pack, the first body 150 is engaged with the outer side of the battery pack, so that the second sealing ring 181 contacts the outer shell of the battery pack, so that the gap at the connection between the two is closed by the second sealing ring 181, which plays a better sealing role and prevents external fluid from entering the battery pack.

[0084] In addition, an external thread may be provided on the second body 160 , and a threaded hole may be provided on the outer shell of the battery pack so as to connect the external thread with the threaded hole on the battery pack, thereby improving the convenience of installing the explosion-proof valve.

[0085] In some embodiments, the valve body 100 also includes a limiting cavity 151, which is arranged in an upper and lower relationship with the installation cavity 130. A second exhaust port 190 is arranged at one end of the limiting cavity 151 away from the installation cavity 130. The blocking member 210 is located in the limiting cavity 151, and a second gas channel 500 is formed between the blocking member 210 and the cavity wall of the limiting cavity 151. When the pressure at the air inlet 120 is greater than the preset air pressure, the second gas channel 500 connects the first exhaust port 110 and the second exhaust port 190.

[0086] The blocking member 210 is disposed in the limiting cavity 151 , which can provide a certain degree of protection for the blocking member 210 . Meanwhile, the gas reaches the second exhaust port 190 along the second gas channel 500 and is discharged through the second exhaust port 190 , which can also prevent the external fluid from directly falling into the first exhaust port 110 .

[0087] In some embodiments, the limiting member 220 passes through the blocking member 210 and is threadedly connected to the blocking member 210, which can reduce the difficulty of processing.

[0088] It is understandable that the blocking member 210 may also be integrally formed with the limiting member 220 , which is not limited in this embodiment.

[0089] In some embodiments, a waterproof breathable membrane 600 is provided at one end of the blocking member 210 facing away from the installation cavity 130, a third gas channel 224 is provided on the limiting member 220, one end of the third gas channel 224 is connected to the waterproof breathable membrane 600, and a second air inlet hole 222 is provided on the limiting member 220, and the second air inlet hole 222 connects the installation cavity 130 and the second gas channel 500.

[0090] Another exhaust channel is formed by the air inlet 120, the first gas channel 140, the first air inlet hole 131, the installation cavity 130, the second air inlet hole 222, the third gas channel 224, and the waterproof breathable membrane 600. When the blocking member 210 is opened into the first exhaust port 110, the gas inside the battery pack can be discharged through the first exhaust port 110 and the waterproof breathable membrane 600. The waterproof breathable membrane 600 has a higher protection level, generally at the IP68 level, so the waterproof breathable membrane 600 itself has a small air permeability, which can not only be used to release the pressure of the battery pack, but also can be used to balance the internal and external air pressure of the battery pack by taking in and out a small amount of gas when the battery pack is working normally.

[0091] In addition, the adjustment component 200 may also include a groove arranged on the sealing member 210, the groove is located at the end of the sealing member 210 facing the waterproof breathable membrane 600, the diameter of the groove is smaller than the outer diameter of the waterproof breathable membrane 600, that is, the waterproof breathable membrane 600 is overlapped above the groove, and a gap equal to the depth of the groove is formed between the third gas channel 224 and the groove, so that the gas discharged from the third gas channel 224 passes through the groove and then enters the waterproof breathable membrane 600, so that the gas entering the waterproof breathable membrane 600 is more evenly distributed through the groove, which facilitates the passage of gas.

[0092] In some embodiments, the explosion-proof valve also includes a cover plate 700, which is disposed above the second exhaust port 190 and has a second exhaust gap 730 between the cover plate 700 and the second exhaust port 190. A connecting portion 710 is provided on the cover plate 700, and a connecting groove 230 is provided at the end of the sealing member 210 facing away from the limiting member 220. The connecting portion 710 is connected to the connecting groove 230. The waterproof breathable membrane 600 is located between the cover plate 700 and the sealing member 210, and the connecting portion 710 is arranged on the outside of the waterproof breathable membrane 600. A third exhaust gap 720 is provided on the connecting portion 710, and the third exhaust gap 720 connects the waterproof breathable membrane 600 and the second exhaust gap 730.

[0093] The waterproof breathable membrane 600 can be protected by the cover plate 700 so that the gas at the waterproof breathable membrane 600 enters the second exhaust gap 730 through the third exhaust gap 720 and then is exhausted, thereby preventing foreign impurities from directly falling on the waterproof breathable membrane 600.

[0094] At the same time, a connecting boss can be set at the end of the first body 150 away from the second body 160, and a slot can be set on the cover plate 700. The slot is engaged with the outside of the connecting boss and has a gap between the connecting boss, so as to prevent external impurities from entering the valve body 100 through the gap.

[0095] In addition, the connection portion 710 and the connection groove 230 may be connected by interference fit, thereby reducing the difficulty of assembly.

[0096] An embodiment of the present application also provides a battery pack, which includes a battery pack body and the explosion-proof valve in the above embodiment.

[0097] The battery pack body generally includes structures such as a shell, a battery module and a battery management system. The battery module is arranged in the shell, and the explosion-proof valve is fixed on the shell. When a single cell in the battery module has thermal runaway, the gas will enter the shell from the single cell, causing the air pressure in the shell to rise. When the air pressure rises to the preset pressure, the air is exhausted and the pressure is released through the explosion-proof valve.

[0098] It is understandable that the structure of each component in the battery pack, the working principle of the battery pack, and the connection method of each component are all well known to technicians in this field, and will not be described in detail in this embodiment.

[0099] An embodiment of the present application also provides an electrical device, which includes a device body and a battery pack, wherein the battery pack is fixed on the device body.

[0100] It can be understood that the electrical equipment in this embodiment includes but is not limited to electric vehicles, hybrid vehicles, energy storage systems, consumer electronic products, medical equipment, drones, power tools and other equipment that require the use of battery packs.

[0101] Finally, it should be noted that those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application content disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application, is not limited to the precise structure described above and shown in the drawings, and can be modified and changed in various ways without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An explosion-proof valve, characterized in that: include: A valve body (100) is provided with a mounting cavity (130) inside, and the valve body (100) is provided with an air inlet (120) and a first air outlet (110) which are in communication with the mounting cavity (130); An adjustment component (200), comprising a blocking member (210) and a limiting member (220), wherein the blocking member (210) is located at the first exhaust port (110) and is used to close or open the first exhaust port (110), wherein one end of the limiting member (220) is connected to the blocking member (210) and the other end extends into the installation cavity (130), and the limiting member (220) can move along an extension direction of the installation cavity (130) to drive the blocking member (210) to open or close the first exhaust port (110); an elastic member (300) located in the installation cavity (130), the elastic member (300) being in contact with the limiting member (220), and the elastic member (300) being configured to apply a pre-tightening force in a first direction to the limiting member (220) when the air pressure at the air inlet (120) is less than a preset air pressure, so that the blocking member (210) closes the first exhaust port (110); A drive assembly (400) comprises a drive member (410), wherein the drive member (410) is located in the installation cavity (130), and the drive member (410) is configured to drive the limit member (220) to move along a second direction opposite to the first direction when the air pressure at the air inlet (120) is greater than or equal to the preset air pressure, so that the blocking member (210) opens the first exhaust port (110).

2. The explosion-proof valve according to claim 1, characterized in that: The driving assembly (400) further comprises a trigger electrode (420), wherein the trigger electrode (420) is at least partially inserted into the driving member (410), and the trigger electrode (420) is configured to generate heat to drive the limiting member (220) to move through the driving member (410) when the air pressure at the air inlet (120) is greater than the preset air pressure.

3. The explosion-proof valve according to claim 2, characterized in that: The driving member (410) includes explosive.

4. The explosion-proof valve according to claim 2, characterized in that: The driving component (400) further comprises a piezoelectric sensor (430), wherein the detection end of the piezoelectric sensor (430) faces the air inlet (120) to detect the real-time air pressure of the air inlet (120), and the trigger electrode (420) is electrically connected to the piezoelectric sensor (430).

5. The explosion-proof valve according to claim 1, characterized in that: A base (221) is provided at one end of the limiting member (220) facing away from the blocking member (210), a limiting portion (133) is provided at one end of the installation cavity (130) close to the blocking member (210), one end of the elastic member (300) is in contact with the limiting portion (133), and the other end is in contact with the base (221).

6. The explosion-proof valve according to claim 5, characterized in that: The elastic member (300) is a first spring, and the first spring is sleeved on the outside of the limiting member (220).

7. The explosion-proof valve according to claim 5, characterized in that: A first positioning portion (223) is provided on the limiting member (220), and a second positioning portion (132) is provided on the inner wall of the installation cavity (130), and the first positioning portion (223) is configured to contact with the second positioning portion (132) when the blocking member (210) opens the first exhaust port (110), so as to limit the position of the limiting member (220) in the installation cavity (130).

8. The explosion-proof valve according to claim 7, characterized in that: One of the first positioning portion (223) and the second positioning portion (132) is a positioning groove, and the other is a positioning pin that cooperates with the positioning groove. An installation groove (225) is provided on the inner wall of the limiting member (220) or the installation cavity (130), and the positioning pin at least partially extends into the installation groove (225). The positioning pin is connected to the bottom of the installation groove (225) through a second spring (226).

9. The explosion-proof valve according to claim 5, characterized in that: A positioning boss (134) is provided in the installation cavity (130), the base (221) is overlapped on the positioning boss (134), and the driving member (410) is located between the limiting member (220) and an end of the installation cavity (130) away from the blocking member (210).

10. The explosion-proof valve according to any one of claims 1 to 9, characterized in that: The valve body (100) has a first gas channel (140) arranged in a ring outside the installation cavity (130), the first gas channel (140) is connected to the gas inlet (120), at least one first gas inlet hole (131) is provided on the cavity wall of the installation cavity (130), the first gas inlet hole (131) connects the first gas channel (140) and the installation cavity (130), a first exhaust gap (227) is provided between the installation cavity (130) and the limiting member (220), and the first exhaust gap (227) is connected to the first exhaust port (110).

11. The explosion-proof valve according to claim 10, characterized in that: The valve body (100) has a first sealing groove (170) surrounding the outside of the first exhaust port (110), and a first sealing ring (171) is arranged in the first sealing groove (170). The first sealing ring (171) is used to abut against the blocking member (210) to close the first exhaust port (110).

12. The explosion-proof valve according to claim 10, characterized in that: The valve body (100) further comprises a first body (150) and a second body (160) connected to each other, wherein the outer diameter of the first body (150) is greater than the outer diameter of the second body (160), the first exhaust port (110) is arranged at an end of the first body (150) away from the second body (160), the air inlet (120) is arranged at an end of the second body (160) away from the first body (150), a second sealing groove (180) is arranged at an end of the first body (150) close to the second body (160), and a second sealing ring (181) is arranged in the second sealing groove (180).

13. The explosion-proof valve according to claim 12, characterized in that: The second body (160) is provided with an external thread so as to be connected to the battery pack via the external thread.

14. The explosion-proof valve according to claim 10, characterized in that: The valve body (100) further comprises a limiting cavity (151), wherein the limiting cavity (151) and the mounting cavity (130) are arranged in an upper and lower relationship, and a second exhaust port (190) is arranged at one end of the limiting cavity (151) away from the mounting cavity (130), and the blocking member (210) is located in the limiting cavity, and a second gas channel (500) is formed between the blocking member (210) and the cavity wall of the limiting cavity, and when the pressure at the air inlet (120) is greater than the preset air pressure, the second gas channel (500) connects the first exhaust port (110) and the second exhaust port (190).

15. The explosion-proof valve according to claim 14, characterized in that: The limiting member (220) passes through the blocking member (210) and is threadedly connected to the blocking member (210).

16. The explosion-proof valve according to claim 15, characterized in that: A waterproof breathable membrane (600) is provided at one end of the blocking member (210) facing away from the installation cavity (130), a third gas channel (224) is provided on the limiting member (220), one end of the third gas channel (224) is connected to the waterproof breathable membrane (600), and a second air inlet hole (222) is provided on the limiting member (220), and the second air inlet hole (222) connects the installation cavity (130) and the second gas channel (500).

17. The explosion-proof valve according to claim 16, characterized in that: The invention also comprises a cover plate (700), wherein the cover plate (700) is arranged on top of the second exhaust port (190) and has a second exhaust gap (730) between the cover plate (700) and the second exhaust port (190); a connecting portion (710) is arranged on the cover plate (700); a connecting groove (230) is arranged at one end of the blocking member (210) away from the limiting member (220); the connecting portion (710) is connected to the connecting groove (230); the waterproof breathable membrane (600) is located between the cover plate (700) and the blocking member (210), and the connecting portion (710) is arranged on the outside of the waterproof breathable membrane (600); a third exhaust gap (720) is arranged on the connecting portion (710); the third exhaust gap (720) connects the waterproof breathable membrane (600) and the second exhaust gap (730).

18. A battery pack, characterized in that: It comprises a battery pack body and at least one explosion-proof valve according to any one of claims 1 to 17, wherein the explosion-proof valve is mounted on the battery pack body.

19. An electrical equipment, characterized in that: The invention comprises a device body and the battery pack according to claim 18, wherein the battery pack is mounted on the device body.

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