An explosion-proof valve, a battery pack and an electric device

Abstract

The embodiment of the application provides an explosion-proof valve, a battery pack and an electric equipment, and relates to the technical field of the battery pack.The explosion-proof valve comprises a valve body, an installation cavity is arranged in the valve body, an air inlet and a first exhaust port are arranged on the valve body and are communicated with the installation cavity;an adjusting assembly comprises a plugging piece and a limiting piece, the plugging piece is located at the first exhaust port and is 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 installation cavity;an elastic piece is located in the installation cavity, the elastic piece is configured to apply a first direction pre-tightening force to the limiting piece when the air pressure of the air inlet is less than a preset air pressure, so that the plugging piece closes the first exhaust port;and a driving assembly comprises a driving piece, the driving piece is configured to drive the limiting piece to move in a second direction opposite to the first direction when the air pressure of the air inlet is greater than or equal to the preset air pressure, so that the plugging piece opens the first exhaust port, thereby effectively controlling the exhaust pressure of the explosion-proof valve and avoiding the accumulation of gas in the battery pack.

Description

TECHNICAL FIELD

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

[0002] Spring type explosion-proof valves are often used in battery packs due to their high reusability and low cost. A spring type explosion-proof valve generally includes a valve body, a spring, a fixed seat, a guide shaft and the like. The fixed seat is used to close or open an exhaust port on the valve body. The spring is used to provide a pre-tightening force for the fixed seat. The guide shaft limits the movement path of the fixed seat. When the gas pressure in the battery pack does not reach the exhaust pressure, the spring pulls the fixed seat to close the exhaust port. When the pressure in the battery pack reaches the exhaust pressure, the fixed seat moves under the push of the gas to overcome the pre-tightening force of the spring to open the exhaust port for exhaust.

[0003] This structure makes the opening of the spring type explosion-proof valve require the joint action of the spring, the fixed seat and the guide shaft. Affected by the performance or size of the spring, the fixed seat and the guide shaft, the opening pressure deviation of explosion-proof valves of the same batch is large, which makes it difficult for the explosion-proof valve to quickly and accurately identify the change of the pressure in the battery pack, resulting in slow opening of the first exhaust port and easy accumulation of gas in the battery pack, increasing the probability of explosion of the battery pack. SUMMARY

[0004] The embodiments of the present application provide an explosion-proof valve, a battery pack and an electric equipment to achieve the effect that the explosion-proof valve automatically opens for pressure relief when the gas pressure in the battery pack reaches a preset gas pressure.

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

[0006] a valve body, an installation cavity is arranged inside the valve body, an air inlet and a first exhaust port are arranged on the valve body and communicate with the installation cavity;

[0007] an adjusting assembly, comprising a plugging piece and a limiting piece, the plugging piece is located at the first exhaust port and is used to close or open the first exhaust port, one end of the limiting piece is connected with the plugging piece and the other end extends into the installation cavity, the limiting piece is movable along the extension direction of the installation cavity to drive the plugging piece to open or close the first exhaust port;

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

[0009] The driving assembly comprises a driving member located in the mounting cavity, the driving member being configured to drive the limiting member to move in a second direction opposite to the first direction when the air pressure of 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 comprises a trigger electrode at least partially inserted into the driving member, the trigger electrode being configured to generate heat to drive the limiting member to move through the driving member when the air pressure of the air inlet is greater than the preset air pressure.

[0011] In some possible designs, the driving member comprises an explosive.

[0012] In some possible designs, the driving assembly further comprises a piezoelectric sensor, a detection end of the piezoelectric sensor being directed toward the air inlet to detect the real-time air pressure of the air inlet, and the trigger electrode being electrically connected to the piezoelectric sensor.

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

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

[0015] In some possible designs, the limiting member is provided with a first positioning portion, and an inner wall of the mounting cavity is provided with a second positioning portion, the first positioning portion being configured to be in contact with the second positioning portion when the blocking member opens the first exhaust port, so as to limit the position of the limiting member in the mounting 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 matched with the positioning groove, the limiting member or the inner wall of the mounting cavity is provided with a mounting groove, the positioning pin is at least partially extended into the mounting groove, and the positioning pin is connected to the bottom of the mounting groove through a second spring.

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

[0018] In some possible design, the valve body has a first gas passage arranged around the mounting cavity, the first gas passage is communicated with the gas inlet, at least one first gas inlet hole is arranged on the cavity wall of the mounting cavity, the first gas inlet hole communicates the first gas passage with the mounting cavity, a first exhaust gap is arranged between the mounting cavity and the limiting member, and the first exhaust gap is communicated with the first exhaust port.

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

[0020] In some possible design, the valve body further comprises a first body and a second body connected with each other, the outer diameter of the first body is larger than that of the second body, the first exhaust port is arranged at one end of the first body away from the second body, the gas inlet is arranged at one end of the second body away from the first body, and 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 design, the second body is provided with external threads to be connected with the battery pack through the external threads.

[0022] In some possible design, the valve body further comprises a limiting cavity arranged in an up-down relationship with the mounting cavity, the limiting cavity is provided with a second exhaust port at one end away from the mounting cavity, the blocking member is arranged in the limiting cavity, and a second gas passage is formed between the blocking member and the cavity wall of the limiting cavity, when the pressure of the gas inlet is greater than the preset gas pressure, the second gas passage communicates the first exhaust port with the second exhaust port.

[0023] In some possible design, the limiting member penetrates through the blocking member and is threadedly connected with the blocking member.

[0024] In some possible design, the blocking member is provided with a waterproof and breathable film at one end away from the mounting cavity, the limiting member is provided with a third gas passage, one end of the third gas passage is communicated with the waterproof and breathable film, the limiting member is provided with a second gas inlet hole, and the second gas inlet hole communicates the mounting cavity with the second gas passage.

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

[0026] The second aspect of the embodiments of the present application provides a battery pack, including a battery pack body and at least one explosion-proof valve of any one of the first aspect, the explosion-proof valve being mounted on the battery pack body.

[0027] The third aspect of the embodiments of the present application provides a use electric device, including a device body and a battery pack of the second aspect, the battery pack being mounted on the device body.

[0028] In the battery valve, the battery pack and the use electric device provided by the embodiments of the present application, the valve body, the adjusting assembly, the elastic piece and the driving assembly are arranged, the adjusting assembly includes the blocking piece and the limiting piece, the blocking piece is used to control the opening and closing of the first exhaust port on the valve body, and the limiting piece is used to be connected with the driving assembly and the elastic piece, wherein the elastic piece is used to apply a first reverse pre-tightening force to the limiting piece when the air pressure in the battery pack is less than a preset air pressure, the limiting piece pulls the blocking piece so that the blocking piece is pressed on the first exhaust port, so that the first exhaust port of the explosion-proof valve is closed, and the driving assembly can obtain the air pressure of the air inlet in real time, and when the air pressure of the air inlet is greater than or equal to the preset air pressure, the driving piece drives the limiting piece to move in a second direction opposite to the first direction to quickly open the first exhaust port for pressure relief when the blocking piece reaches the preset air pressure, so that the air pressure in the battery pack is quickly consistent with the air pressure outside, the gas is prevented from accumulating in the battery pack, the probability of explosion of the battery pack is reduced, and the safety of use of the battery pack is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings incorporated into the specification and forming a part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application.

[0030] Figure 1 The structure schematic diagram of the closed valve state of the explosion-proof valve provided by the embodiments of the present application is shown in the figure.

[0031] Figure 2 The structure schematic diagram of the open valve state of the explosion-proof valve in Figure 1

[0032] Figure 3 ​A structure diagram of the first positioning part and the second positioning part in the explosion-proof valve provided by the embodiments of the present application is shown.

[0033] Reference signs:

[0034] 100 - valve body; 110 - first exhaust port; 120 - air inlet; 130 - mounting cavity; 131 - first air inlet hole; 132 - second positioning part; 133 - limiting part; 134 - positioning boss; 140 - first gas passage; 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 - plugging piece; 220 - limiting piece; 221 - base; 222 - second air inlet hole; 223 - first positioning part; 224 - third gas passage; 225 - mounting groove; 226 - second spring; 227 - first exhaust gap; 230 - connecting groove;

[0036] 300 - elastic piece;

[0037] 400 - driving assembly; 410 - driving piece; 420 - trigger electrode; 430 - piezoelectric sensor;

[0038] 500 - second gas passage;

[0039] 600 - waterproof and air-permeable membrane;

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

[0041] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals represent like elements, unless the context dictates otherwise. The following exemplary embodiments described are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] The current spring type explosion-proof valve is basically passive opening valve. Specifically, the spring type explosion-proof valve generally includes a valve body, a spring, a fixed seat, a guide shaft and the like. The fixed seat is used to close or open the exhaust port on the valve body. The spring is used to provide pre-tightening force for the fixed seat. The guide shaft limits the movement path of the fixed seat. When the gas pressure in the battery pack does not reach the exhaust pressure, the spring pulls the fixed seat to close the exhaust port. When the pressure in the battery pack reaches the exhaust pressure, the fixed seat moves under the push of the gas to overcome the pre-tightening force of the spring to open the exhaust port for exhaust.

[0044] The spring type explosion-proof valve needs the cooperation of the spring, the fixed seat, the guide shaft and the like to open. If the pre-tightening force of the spring is insufficient or the sizes of the fixed seat and the guide shaft are deviated, the opening valve pressure of the explosion-proof valve of the same batch will also be greatly deviated. However, this situation is difficult to avoid. Therefore, the opening valve pressure of the current spring type explosion-proof valve is generally not an accurate value but a range value, and the difference between the upper limit value and the lower limit value of the range value gradually increases as the opening valve pressure increases.

[0045] If thermal runaway occurs in a single cell in the battery pack, the pressure in the battery pack will increase instantaneously. Generally, the gas in the battery pack needs to be quickly discharged at a certain specific pressure, such as 10 MPa. However, such a spring type explosion-proof valve cannot quickly and accurately identify the pressure change in the battery pack, and may not be able to quickly open the valve to discharge the gas, which may increase the risk of battery explosion.

[0046] To this end, the embodiments of the present application provide an explosion-proof valve, a battery pack and an electrical equipment. The valve body of the explosion-proof valve is provided with a driving assembly. The driving assembly can accurately control the opening of the first exhaust port on the valve body by the blocking piece at a preset gas pressure according to the gas pressure in the battery pack, so as to avoid the accumulation of gas 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 by the embodiments of the present application can not only be applied to the battery pack, but also be applied to other devices similar to the battery pack in terms of pressure relief requirements. The embodiments of the present application do not limit them here.

[0048] In addition, the battery pack provided by the embodiments of the present application can be applied to the fields of industrial automation, automotive electronics, renewable energy, communication equipment, medical equipment, aerospace, lighting systems and the like. The embodiments of the present application do not limit them here.

[0049] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail in the specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0050] Please refer to Figure 1 and Figure 2 As shown in the drawings, in some embodiments, the explosion-proof valve comprises a valve body 100, an adjusting assembly 200, an elastic member 300 and a driving assembly 400.

[0051] The inside of the valve body 100 is provided with a mounting cavity 130, and the valve body 100 is further provided with an air inlet 120 and a first air outlet 110, both of which are in communication with the mounting cavity 130 to form a gas passage, 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 air outlet 110. The adjusting assembly 200 comprises a blocking member 210 and a limiting member 220, the blocking member 210 is located at the first air outlet 110 and is used to close or open the first air outlet 110, one end of the limiting member 220 is connected with the blocking member 210 and the other end extends into the mounting cavity 130, and the limiting member 220 is movable along the extension direction of the mounting cavity 130 to drive the blocking member 210 to open or close the first air outlet 110. The elastic member 300 is located in the mounting cavity 130 and is in contact with the limiting member 220, and is used to apply a first direction pre-tightening force to the limiting member 220 when the air pressure of the air inlet 120 is less than a preset air pressure, so as to close the first air outlet 110 by the blocking member 210, that is, when the air pressure in the battery pack is normal, the blocking member 210 can be controlled to close the first air outlet 110 by the elastic member 300, so as to prevent water or gas from the outside from entering the battery pack through the valve body 100. The driving assembly 400 comprises a driving member 410, which is located in the mounting cavity 130 and is used to drive the limiting member 220 to move in a second direction opposite to the first direction to open the first air outlet 110 for pressure relief when the air pressure of the air inlet 120 is greater than or equal to the preset air pressure, overcoming the pre-tightening force provided by the elastic member 300.

[0052] Among them, the driving assembly 400 can comprise a sensor capable of detecting the air pressure of the air inlet 120, which directly drives the driving member 410 to drive the limiting member 220 to move when the air pressure of the air inlet 120 reaches the preset air pressure. The limiting member 220 moves along the mounting cavity 130, so that the limiting part 133 not only has the function of pushing the blocking member 210 to move, but also can limit the movement path through the mounting cavity 130 to avoid the blocking member 210 from tilting.

[0053] The preset air pressure can be determined according to the use condition, which is not 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 pressure of the battery pack is normal, that is, always less than the preset pressure, the driving member 410 will not act, and the elastic member 300 can pull the limiting member 220 to keep the sealing member 210 in a state of closing the first exhaust port 110, thereby preventing external liquids and other substances from entering the battery pack. If the battery pack has a thermal runaway of a single battery cell, the pressure reaches the preset pressure, the driving member 410 will immediately drive the limiting member 220 to move, so that the sealing 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 size deviation of the components, to avoid the accumulation of gas in the battery pack.

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

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

[0057] Exemplarily, the driving member 410 can include explosives, which can be wrapped by a protective film, or can be placed in a slot at the bottom of the limiting member 220, or can be placed in a part of the cavity wall of the installation cavity 130, or can 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 sealing member 210, and the trigger electrode 420 extends into the interior of the explosives. Once the trigger electrode 420 generates heat, it can instantly detonate the explosives, thereby pushing the limiting member 220 to move quickly through the energy generated by the explosion of the explosives, so that the sealing member 210 immediately opens the first exhaust port 110.

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

[0059] For example, when NaN3 is used in the explosion-proof valve, the energy released by the explosion of NaN3 and the large amount of nitrogen gas generated can generate sufficient thrust to instantaneously push the blocking member 210 to open the first exhaust port 110.

[0060] Compared with the existing spring-type explosion-proof valve, the energy generated by the explosive can provide greater thrust to the limiting member 220, so that a larger gap is generated between the blocking member 210 and the first exhaust port 110, which means that the exhaust rate is faster after the blocking member 210 opens the first exhaust port 110.

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

[0062] Of course, the end of the mounting cavity 130 away from the blocking member 210 is closed, so as to avoid the gas from leaving the end of the mounting cavity 130 when the high-pressure gas generated by the explosion of the explosive or the gas released by the high-pressure cylinder. The end of the limiting member 220 away from the blocking member 210 is also preferably in sealing connection with the wall of the mounting cavity 130, or only has a very small gap.

[0063] In some embodiments, the drive assembly 400 further comprises a piezoelectric sensor 430, and 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. The trigger electrode 420 is electrically connected with the piezoelectric sensor 430.

[0064] The piezoelectric sensor 430 is a sensor made by using the piezoelectric effect of some dielectrics under stress. The piezoelectric effect refers to the phenomenon that some dielectrics will generate electric charges on the surface when subjected to pressure to a certain extent, which is well known to those skilled in the art, and will not be described here.

[0065] When the piezoelectric sensor 430 detects that the air pressure of the air inlet 120 reaches the preset air pressure, an electric current will be generated, which is transmitted to the trigger electrode 420 to make the trigger electrode 420 heat up, thereby triggering the explosion of the explosive to push the limiting member 220 to move. In this way, without additional circuit, the piezoelectric sensor 430 and the trigger electrode 420 can be used to detonate the explosive, so that the overall structure of the explosion-proof valve is relatively simple.

[0066] In some embodiments, the limiting member 220 is provided with a base 221 at one end away from the blocking member 210, the mounting cavity 130 is provided with a limiting portion 133 at one end close to the blocking member 210, and the elastic member 300 is in contact with the limiting portion 133 at one end and in contact with the base 221 at the other end. Thus, the elastic member 300 can be supported by the base 221 and the limiting portion 133.

[0067] For example, the elastic member 300 can be a plurality of elastic pieces arranged side by side, one end of the elastic piece being connected to the limiting portion 133 and the other end being connected to the base 221.

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

[0069] In some embodiments, as shown in Figure 3 The limiting member 220 is provided with a first positioning portion 223, and the inner wall of the mounting cavity 130 is provided with a second positioning portion 132. 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, so as 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 moves 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 mounting cavity 130, and the blocking member 210 can be maintained in the state of opening the first exhaust port 110, thereby continuously discharging the gas in the battery pack, balancing the gas pressure inside and outside the battery pack, and reducing the risk of explosion.

[0071] In some embodiments, as shown in Figure 3 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 part 223 as a positioning groove and the second positioning part 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 limiting member 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 extends at least partially 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 mounting cavity 130 and retracts into the mounting 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 out of the mounting groove 225 under the action of the second spring 226 and insert into the positioning groove. Thus, the positioning pin and the positioning groove limit the position of the limiting member 220, ensuring that the first exhaust port 110 is always in the open state.

[0073] In some embodiments, a positioning boss 134 is provided in the mounting cavity 130, the base 221 is attached to the positioning boss 134, and the driving member 410 is located between the limiting member 220 and the end of the mounting cavity 130 away from the sealing member 210.

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

[0075] In some embodiments, such as Figure 1 As shown, the end of the mounting cavity 130 away from the sealing member 210 can be closed, and the piezoelectric sensor 430 is fixed at this end of the mounting cavity 130. The outer diameter of the limiting member 220 is smaller than the inner diameter of the mounting cavity 130. Only the outer diameter of the base 221 is compatible with the outer diameter of the mounting cavity 130. The limiting part 133 is located at the end of the mounting cavity 130 near the first exhaust port 110, and the limiting part 133 can be set as an annular shape. Its inner diameter is compatible with the outer diameter of the limiting member 220, and only a very small gap is left between the two as the first exhaust gap 227.

[0076] The valve body 100 has a first gas passage 140 that is arranged around the mounting cavity 130. The first gas passage 140 is connected to the air inlet 120. At least one first air inlet hole 131 is provided on the cavity wall of the mounting cavity 130. The first air inlet hole 131 connects the first gas passage 140 and the mounting cavity 130. 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 passage 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] The size of the first exhaust gap 227 should not be too large. The first exhaust gap 227 is used to connect the first exhaust port 110 and the installation cavity 130, which can not only discharge the gas, but also prevent the liquid from entering the installation cavity 130 through the first exhaust gap 227, thereby preventing the external liquid from flowing back into the battery pack, and protecting the battery pack.

[0079] It can be understood that the first exhaust gap 227 can also not be provided, and a third air inlet hole can be provided at the 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, the external fluid is easy to 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, 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 piece 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 blocking piece 210 is pressed on the first sealing ring 171, the first sealing ring 171 can be deformed, thereby sealing the gap between the blocking piece 210 and the first sealing ring 171, and preventing the external fluid from entering the inside of the valve body 100 through the first exhaust port 110.

[0082] In some embodiments, the valve body 100 further includes a first main body 150 and a second main body 160 connected to each other. The first main body 150 and the second main body 160 can be integrally formed. The outer diameter of the first main body 150 is larger than the outer diameter of the second main body 160. The first exhaust port 110 is arranged at the end of the first main body 150 away from the second main body 160. The air inlet 120 is arranged at the end of the second main body 160 away from the first main body 150. The first main body 150 has a second sealing groove 180 at the end close to the second main body 160. A second sealing ring 181 is arranged in the second sealing groove 180.

[0083] Specifically, the first gas passage 140 and the mounting cavity 130 can be arranged in the second body 160, and the limiting part 133 is arranged in the first body 150 or at the joint of the first body 150 and the second body 160, and the limiting member 220 extends through the first body 150 into the second body 160. The second body 160 is used to be connected with the battery pack, and can be inserted into the shell of the battery pack, and after the second body 160 is inserted into the shell of the battery pack, the first body 150 is clamped on the outside of the battery pack, so that the second sealing ring 181 is in contact with the shell of the battery pack, thereby closing the gap at the joint of the two through the second sealing ring 181, and a better sealing effect is achieved, so that external fluid is prevented from entering the battery pack.

[0084] In addition, external threads can also be arranged on the second body 160, and a threaded hole is arranged on the shell of the battery pack, so that the external threads are connected with the threaded hole on the battery pack, thereby improving the convenience of installation of the explosion-proof valve.

[0085] In some embodiments, the valve body 100 further comprises a limiting cavity 151 arranged in an up-down relationship with the mounting cavity 130, and a second exhaust port 190 is arranged at one end of the limiting cavity 151 away from the mounting cavity 130. The blocking member 210 is located in the limiting cavity 151, and a second gas passage 500 is formed between the blocking member 210 and the cavity wall of the limiting cavity 151. When the pressure of the air inlet 120 is greater than a preset air pressure, the second gas passage 500 is connected with the first exhaust port 110 and the second exhaust port 190.

[0086] The blocking member 210 is arranged in the limiting cavity 151, which can protect the blocking member 210 to a certain extent, and at the same time, the gas reaches the second exhaust port 190 along the second gas passage 500 and is discharged through the second exhaust port 190, which can also prevent external fluid from directly falling into the first exhaust port 110.

[0087] In some embodiments, the limiting member 220 penetrates the blocking member 210 and is threadedly connected with the blocking member 210, which can reduce the processing difficulty.

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

[0089] In some embodiments, the blocking member 210 is provided with a waterproof and breathable film 600 at one end away from the mounting cavity 130, the limiting member 220 is provided with a third gas passage 224, one end of the third gas passage 224 is communicated with the waterproof and breathable film 600, the limiting member 220 is provided with a second air inlet hole 222, and the second air inlet hole 222 is communicated with the mounting cavity 130 and the second gas passage 500.

[0090] Another exhaust passage is formed by the air inlet 120, the first gas passage 140, the first air inlet hole 131, the mounting cavity 130, the second air inlet hole 222, the third gas passage 224, and the waterproof and breathable membrane 600. When the blocking piece 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 and breathable membrane 600. The waterproof and breathable membrane 600 has a high protection level, generally needs to be IP68 level, and thus the air permeability of the waterproof and breathable membrane 600 is small. The waterproof and breathable membrane 600 can be used not only for pressure relief of the battery pack but also for balancing the internal and external air pressures of the battery pack when the battery pack is normally working.

[0091] In addition, the adjusting assembly 200 can further include a groove arranged on the blocking piece 210. The groove is located at an end of the blocking piece 210 facing the waterproof and breathable membrane 600. The diameter of the groove is smaller than the outer diameter of the waterproof and breathable membrane 600, that is, the waterproof and breathable membrane 600 is overlapped above the groove, and a gap equal to the depth of the groove is formed between the waterproof and breathable membrane 600 and the groove. The third gas passage 224 is in communication with the groove, so that the gas discharged from the third gas passage 224 enters the waterproof and breathable membrane 600 through the groove. Thus, the gas entering the waterproof and breathable membrane 600 is distributed more uniformly through the groove, facilitating the passage of the gas.

[0092] In some embodiments, the explosion-proof valve further includes a cover plate 700 arranged above the second exhaust port 190 and having a second exhaust gap 730 between the cover plate 700 and the second exhaust port 190. The cover plate 700 is provided with a connecting portion 710, and the blocking piece 210 is provided with a connecting groove 230 at an end away from the limiting piece 220. The connecting portion 710 is connected with the connecting groove 230. The waterproof and breathable membrane 600 is located between the cover plate 700 and the blocking piece 210, and the connecting portion 710 is annularly arranged outside the waterproof and breathable membrane 600. The connecting portion 710 is provided with a third exhaust gap 720 in communication with the waterproof and breathable membrane 600 and the second exhaust gap 730.

[0093] The cover plate 700 can protect the waterproof and breathable membrane 600, so that the gas at the waterproof and breathable membrane 600 enters the second exhaust gap 730 through the third exhaust gap 720 and is then discharged, avoiding that foreign matters directly fall on the waterproof and breathable membrane 600.

[0094] Meanwhile, a connecting boss can be arranged at an end of the first body 150 away from the second body 160, and a clamping groove can be arranged on the cover plate 700 and clamped outside the connecting boss with a gap between the clamping groove and the connecting boss. In this way, foreign matters can be prevented from entering the valve body 100 through the gap.

[0095] In addition, the connecting portion 710 and the connecting groove 230 can be connected through interference fit, so as to reduce the assembly difficulty.

[0096] The application also provides a battery pack, which comprises a battery pack body and the explosion-proof valve in the above embodiments.

[0097] The battery pack body generally comprises a shell, a battery module and a battery management system, etc., the battery module is arranged in the shell, and the explosion-proof valve is fixed on the shell. When the single battery cell in the battery module is in thermal runaway, gas enters the shell from the single battery cell, so that the gas pressure in the shell rises. When the gas pressure rises to a preset gas pressure, the gas is discharged through the explosion-proof valve.

[0098] It can be understood that the structure of each component in the battery pack, the working principle of the battery pack, and the connection mode of each component are well known to those skilled in the art, and the present embodiment will not be described here.

[0099] The application also provides a power consumption device, which comprises a device body and a battery pack, and the battery pack is fixed on the device body.

[0100] It can be understood that the power consumption device in the present embodiment includes but is not limited to electric vehicles, hybrid vehicles, energy storage systems, consumer electronics, medical devices, unmanned aerial vehicles, electric tools and other devices that need to use battery packs.

[0101] Finally, it should be noted that: other embodiments of the application will be easily conceived by those skilled in the art after considering the specification and practicing the application disclosed herein. The application is intended to cover any variations, uses or adaptive changes of the application that follow the general principles of the application and include common knowledge or conventional technical means in the art that are not disclosed in the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body (100) has an internal mounting cavity (130), and the valve body (100) is provided with an air inlet (120) and a first exhaust port (110) communicating with the mounting cavity (130); 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). An elastic element (300) is located in the mounting cavity (130). The elastic element (300) is in contact with the limiting element (220). The elastic element (300) is configured to apply a pre-tightening force in a first direction to the limiting element (220) when the air pressure at the air inlet (120) is less than a preset air pressure, so that the sealing element (210) closes the first exhaust port (110). A drive assembly (400) includes a drive member (410) located within the mounting cavity (130). The drive member (410) is configured to drive the limiting 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, thereby causing the sealing member (210) to open the first exhaust port (110). The valve body (100) has a first gas passage (140) surrounding the mounting cavity (130), the first gas passage (140) is connected to the air inlet (120), the mounting cavity (130) has at least one first air inlet (131) on its cavity wall, the first air inlet (131) is connected to the first gas passage (140) and the mounting cavity (130), the mounting cavity (130) and the limiting member (220) have a first exhaust gap (227), the first exhaust gap (227) is connected to the first exhaust port (110).

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

3. The explosion-proof valve according to claim 2, characterized in that, The drive unit (410) includes explosives.

4. The explosion-proof valve according to claim 2, characterized in that, The drive assembly (400) further includes a piezoelectric sensor (430) with its detection end facing the air inlet (120) to detect the real-time air pressure of the air inlet (120). The trigger electrode (420) is electrically connected to the piezoelectric sensor (430).

5. The explosion-proof valve according to claim 1, characterized in that, The limiting member (220) is provided with a base (221) at one end away from the sealing member (210), and the mounting cavity (130) is provided with a limiting part (133) at one end near the sealing member (210). One end of the elastic member (300) is in contact with the limiting part (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 element (300) is a first spring, which is sleeved on the outside of the limiting element (220).

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

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

9. The explosion-proof valve according to claim 5, characterized in that, The mounting cavity (130) is provided with a positioning boss (134), the base (221) is attached to the positioning boss (134), and the driving member (410) is located between the limiting member (220) and the end of the mounting cavity (130) away from the sealing member (210).

10. The explosion-proof valve according to any one of claims 1-9, 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 provided in the first sealing groove (170). The first sealing ring (171) is used to abut against the sealing member (210) to close the first exhaust port (110).

11. The explosion-proof valve according to any one of claims 1-9, characterized in that, The valve body (100) further includes a first body (150) and a second body (160) connected to each other. The outer diameter of the first body (150) is larger than the outer diameter of the second body (160). The first exhaust port (110) is located at the end of the first body (150) away from the second body (160). The air inlet (120) is located at the end of the second body (160) away from the first body (150). A second sealing groove (180) is provided at the end of the first body (150) near the second body (160). A second sealing ring (181) is provided in the second sealing groove (180).

12. The explosion-proof valve according to claim 11, characterized in that, The second body (160) is provided with external threads for connection to the battery pack via the external threads.

13. The explosion-proof valve according to any one of claims 1-9, characterized in that, The valve body (100) further includes a limiting cavity (151), which is arranged vertically with the mounting cavity (130). A second exhaust port (190) is provided at the end of the limiting cavity (151) away from the mounting cavity (130). The sealing member (210) is located in the limiting cavity, and a second gas passage (500) is formed between the sealing member (210) and the cavity wall of the limiting cavity. When the pressure at the air inlet (120) is greater than the preset air pressure, the second gas passage (500) connects the first exhaust port (110) and the second exhaust port (190).

14. The explosion-proof valve according to claim 13, characterized in that, The limiting member (220) passes through the sealing member (210) and is threadedly connected to the sealing member (210).

15. The explosion-proof valve according to claim 14, characterized in that, The sealing member (210) is provided with a waterproof and breathable membrane (600) at one end away from the mounting cavity (130). The limiting member (220) is provided with a third gas channel (224), one end of which is connected to the waterproof and breathable membrane (600). The limiting member (220) is provided with a second air inlet (222), which connects the mounting cavity (130) and the second gas channel (500).

16. The explosion-proof valve according to claim 15, characterized in that, It also includes a cover plate (700), which covers the second exhaust port (190) and has a second exhaust gap (730) between it and the second exhaust port (190). The cover plate (700) is provided with a connecting part (710). The sealing member (210) is provided with a connecting groove (230) at one end away from the limiting member (220). The connecting part (710) is connected to the connecting groove (230). The waterproof and breathable membrane (600) is located between the cover plate (700) and the sealing member (210). The connecting part (710) is arranged around the outside of the waterproof and breathable membrane (600). The connecting part (710) is provided with a third exhaust gap (720). The third exhaust gap (720) connects the waterproof and breathable membrane (600) and the second exhaust gap (730).

17. A battery pack, characterized in that, It includes a battery pack body and at least one explosion-proof valve as described in any one of claims 1-16, the explosion-proof valve being mounted on the battery pack body.

18. An electrical appliance, characterized in that, It includes a device body and a battery pack as described in claim 17, the battery pack being mounted on the device body.

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