Pressure release valve and battery pack

Abstract

The utility model provides a pressure release valve and a battery pack, the pressure release valve comprises a valve body, a through pressure release hole is formed in the valve body, a whistle hole is formed in the outer circumferential surface of the valve body, the whistle hole extends to the inner circumferential surface of the pressure release hole, an opening communicated with the pressure release hole is formed in the inner circumferential surface, and the whistle hole is configured to generate sound when part of gas in the pressure release hole is discharged. According to the pressure release valve and the battery pack provided by the embodiment of the invention, the whistle hole communicated with the pressure release hole is formed in the peripheral surface of the valve body, so that when the battery module is subjected to thermal runaway, high-temperature gas ejected from a battery cell of the battery module is discharged to the outside of a shell of the battery pack through the pressure release hole, and in the process, the high-temperature gas is discharged to the outside of the shell of the battery pack; a part of high-temperature gas can be discharged from the whistle hole of the valve body at a high speed, and a sound signal is generated. Even if the battery management system breaks down and the thermal runaway fault signal is not sent in time for prompting, the sound signal generated by the pressure release valve can be used for prompting.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a pressure relief valve and a battery pack. Background Art

[0002] In the related art, when a thermal runaway occurs in a battery module within a battery pack, the Battery Management System (BMS) within the battery pack will send a thermal runaway fault signal for prompting. However, in practical applications, when a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module may damage the battery management system, resulting in the battery management system being unable to send a thermal runaway fault signal for prompting in a timely manner. Summary of the Utility Model

[0003] Embodiments of this application provide a pressure relief valve and a battery pack, which can improve the technical problem that when a thermal runaway occurs in a battery module, the battery management system is damaged and unable to send a thermal runaway fault signal for prompting in a timely manner.

[0004] In a first aspect, embodiments of this application provide a pressure relief valve. The pressure relief valve includes a valve body. The valve body is provided with a through pressure relief hole. A whistle hole is provided on the outer peripheral surface of the valve body. The whistle hole extends to the inner peripheral surface of the pressure relief hole and forms an opening communicating with the pressure relief hole on the inner peripheral surface. The whistle hole is configured to generate a sound when a part of the gas in the pressure relief hole is discharged.

[0005] In one embodiment, the pressure relief hole includes an opposite inlet and outlet. The valve body includes an inclined surface on one side of the whistle hole along the direction from the inlet to the outlet. The inclined surface extends from the outer peripheral surface to the edge of the opening. In the direction from the outlet to the inlet, the inclined surface is inclined towards the pressure relief hole.

[0006] In one embodiment, the number of the whistle holes is multiple, and the multiple whistle holes are arranged along the circumferential direction of the valve body.

[0007] In one embodiment, the pressure relief valve further includes a flow dividing part arranged in the pressure relief hole. The flow dividing part divides the pressure relief hole into multiple flow channels. The multiple flow channels are arranged along the circumferential direction of the valve body. The multiple flow channels are in one-to-one correspondence and communication with the openings of the multiple whistle holes.

[0008] In one embodiment, the flow dividing part includes multiple flow dividing plates arranged along the circumferential direction of the valve body. The adjacent two flow dividing plates and the inner peripheral surface of the pressure relief hole enclose to form the flow channel.

[0009] In one embodiment, the pressure relief hole includes opposite inlet and outlet, and the pressure relief valve further includes a sealing film connected to the valve body, the sealing film closing the inlet; a sharp portion is provided on a side of the flow dividing portion facing the sealing film.

[0010] In one embodiment, the pressure relief hole includes opposite inlet and outlet, the pressure relief hole includes a first hole section and a second hole section arranged along a direction from the inlet to the outlet, the opening is located in the second hole section, and a radial cross-sectional area of the first hole section is smaller than a radial cross-sectional area of the second hole section.

[0011] In one embodiment, the radial cross-sectional area of the first hole section is greater than or equal to 12 mm 2 ; the radial cross-sectional area of the first hole section is smaller than or equal to 80 mm 2 .

[0012] In one embodiment, a minimum distance between an end of the first hole section away from the inlet and the opening is smaller than or equal to 6 mm, and the minimum distance between the end of the first hole section away from the inlet and the opening is greater than or equal to 3 mm.

[0013] In a second aspect, an embodiment of the present application provides a battery pack, including:

[0014] A housing, the housing including a cavity;

[0015] A battery module, disposed in the cavity;

[0016] A pressure relief valve, the pressure relief valve being the pressure relief valve as described above, the pressure relief valve including a valve body, the valve body being provided with a through pressure relief hole, an outer peripheral surface of the valve body being provided with a whistle hole, the whistle hole extending to an inner peripheral surface of the pressure relief hole and forming an opening communicating with the pressure relief hole on the inner peripheral surface, the whistle hole being configured to generate a sound when a part of the gas in the pressure relief hole is discharged, the pressure relief valve being connected to the housing, and the pressure relief hole of the valve body being configured to communicate the cavity with the outside of the housing.

[0017] Advantageous effects of the embodiments of the present application:

[0018] The pressure relief valve and the battery pack provided by the embodiments of the present application are provided with a whistle hole communicating with the pressure relief hole on the outer peripheral surface of the valve body. When a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module is discharged to the outside of the housing of the battery pack through the pressure relief hole. During this process, a part of the high-temperature gas is discharged from the whistle hole of the valve body at a relatively high speed and generates a sound signal. Even if the battery management system fails and does not send a thermal runaway fault signal in time for prompting, the sound signal generated by the pressure relief valve can be used for prompting. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of an embodiment of a pressure relief valve provided by an embodiment of the present application;

[0021] Figure 2 is another perspective view of an embodiment of a pressure relief valve provided by an embodiment of the present application;

[0022] Figure 3 is a cross-sectional view of an embodiment of a pressure relief valve provided by an embodiment of the present application, where the cross-section is taken along the direction from the inlet to the outlet of the pressure relief hole;

[0023] Figure 4 is an exploded structural diagram of a pressure relief valve provided by an embodiment of the present application;

[0024] Figure 5 is a cross-sectional view of an embodiment of a valve body and a flow splitting portion provided by an embodiment of the present application, where the cross-section is taken along the direction from the inlet to the outlet of the pressure relief hole.

[0025] Pressure relief valve 100; Valve body 110; Pressure relief hole 1100; Inlet 1101; Outlet 1102; First hole section 1110; Second hole section 1120; Flow channel 1121; Whistle hole 1130; Opening 1131; Inclined surface 111; Side surface 112; Flow splitting portion 120; Flow splitting plate 121; Sharp portion 130; Tip 131; Connection end 132; Clamping portion 140; Mounting protrusion 150; Sealing film 160; Sealing member 170. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inner" and "outer" are relative to the contour of the device.

[0027] In the related art, when a thermal runaway occurs in a battery module within a battery pack, the Battery Management System (BMS) within the battery pack will send a thermal runaway fault signal for prompt. However, in actual applications, when a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module may damage the battery management system, resulting in the battery management system being unable to send a thermal runaway fault signal for prompt in a timely manner. Additionally, when the battery pack is squeezed or punctured, it may cause the battery management system to be damaged first. When a thermal runaway subsequently occurs in the battery module, the battery management system is also unable to send a thermal runaway fault signal for prompt in a timely manner.

[0028] When the battery pack is used in a vehicle, if the battery management system fails to send a thermal runaway fault signal for prompt in a timely manner when a thermal runaway occurs in the battery module, it will not only cause property losses, but also shorten the escape time of the vehicle occupants. In severe cases, it may even trigger a safety accident.

[0029] To address the above problems, an embodiment of the present application provides a pressure relief valve. The pressure relief valve is used for a battery pack.

[0030] As Figure 1 shown, the pressure relief valve 100 includes a valve body 110. The valve body 110 is provided with a through pressure relief hole 1100. The pressure relief valve 100 is configured to be connected to the housing of the battery pack (not shown in the figure). The pressure relief hole 1100 of the valve body 110 is configured to communicate the cavity of the housing with the outside of the housing. Among them, as Figure 1 and Figure 5 shown, the pressure relief hole 1100 includes opposite inlets 1101 and outlets 1102. When the pressure relief valve 100 is connected to the housing, the inlet 1101 of the pressure relief hole 1100 communicates with the cavity of the housing, and the outlet 1102 of the valve body 110 communicates with the outside of the housing. A battery module (not shown in the figure) is provided in the cavity of the housing. When a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module can be discharged to the outside of the housing of the battery pack through the pressure relief hole 1100 to reduce the pressure inside the housing.

[0031] In some embodiments, as Figures 1 to 5 shown, a whistle hole 1130 can be provided on the outer peripheral surface of the valve body 110. The whistle hole 1130 extends to the inner peripheral surface of the pressure relief hole 1100 and forms an opening 1131 communicating with the pressure relief hole 1100 on the inner peripheral surface. Among them, the whistle hole 1130 is configured to generate a sound when a part of the gas in the pressure relief hole 1100 is discharged.

[0032] The pressure relief valve 100 provided by the embodiment of the present application is provided with a whistle hole 1130 communicating with the pressure relief hole 1100 on the outer peripheral surface of the valve body 110. When a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module flows along Figure 5The gas is discharged to the outside of the battery pack housing through the pressure relief hole 1100 in the direction indicated by the arrow. During this process, a part of the high-temperature gas will be discharged from the whistle hole 1130 of the valve body 110 at a relatively high speed and generate a sound signal. Even if the battery management system fails and does not send a thermal runaway fault signal in time for prompting, the sound signal generated by the pressure relief valve 100 can be used for prompting. Among them, the high-speed gas flowing through the whistle hole 1130 can be made to generate turbulence to produce sound, or the high-speed gas flowing through the whistle hole 1130 can make the edge of the opening 1131 vibrate at a high speed to produce sound, which can be specifically determined according to the structure of the whistle hole 1130.

[0033] In some embodiments, the valve body 110 can include an inclined surface 111 located on one side of the whistle hole 1130 along the direction from the inlet 1101 to the outlet 1102. The inclined surface 111 extends from the outer peripheral surface of the valve body 110 to the edge of the opening 1131 of the whistle hole 1130. Moreover, in the direction from the outlet 1102 to the inlet 1101 of the pressure relief hole 1100, the inclined surface 111 is inclined towards the pressure relief hole 1100. Thus, when the high-speed air flow in the pressure relief hole 1100 flows through the whistle hole 1130, it is easier to form a spiral eddy current in the whistle hole 1130, causing the gas to vibrate rapidly and generate a greater sound.

[0034] As Figure 1 、 Figure 3 and Figure 5 shown, the valve body 110 can also include a side surface 112 located on one side of the whistle hole 1130 along the direction from the outlet 1102 to the inlet 1101. The side surface 112 extends from the outer peripheral surface of the valve body 110 to the edge of the opening 1131 of the whistle hole 1130. The side surface 112 is connected to the inclined surface 111 and encloses to form the whistle hole 1130. Among them, the side surface 112 can be substantially perpendicular to the direction from the inlet 1101 to the outlet 1102 of the valve body 110.

[0035] In some embodiments, the number of the whistle holes 1130 on the valve body 110 can be multiple. The multiple whistle holes 1130 respectively extend from the outer peripheral surface of the valve body 110 to the inner peripheral surface of the pressure relief hole 1100 and respectively form openings 1131 communicating with the pressure relief hole 1100 on the inner peripheral surface of the pressure relief hole 1100. When the high-temperature gas ejected from the battery cells of the battery module is discharged to the outside of the battery pack housing through the pressure relief hole 1100, a part of the high-speed gas in the pressure relief hole 1100 will be discharged from the multiple whistle holes 1130 and generate sound, thereby increasing the total volume of the sound.

[0036] Among them, a plurality of whistle holes 1130 can be arranged along the circumferential direction of the valve body 110, so that when part of the gas in the pressure relief hole 1100 is discharged from the plurality of whistle holes 1130, it all has a relatively high speed, and the generated sound has a relatively high volume. Moreover, arranging the plurality of whistle holes 1130 along the circumferential direction of the valve body 110 will not cause an increase in the length of the valve body 110 from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100.

[0037] Of course, a plurality of whistle holes 1130 can also be arranged in sequence along the direction from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100. When the high-temperature gas ejected from the battery cells of the battery module is discharged to the outside of the battery pack housing through the pressure relief hole 1100, a part of the high-speed gas in the pressure relief hole 1100 can also be discharged from the plurality of whistle holes 1130 and generate sound.

[0038] It should be noted that the shapes of the plurality of whistle holes 1130 opened in the valve body 110 can be the same or different, as long as part of the gas in the pressure relief hole 1100 can generate sound when discharged from the whistle holes 1130. Of course, the former makes it more convenient for the plurality of whistle holes 1130.

[0039] In some embodiments, as Figure 1 、 Figure 3 and Figure 5 shown, the pressure relief valve 100 may further include a flow dividing portion 120 disposed in the pressure relief hole 1100, and the flow dividing portion 120 divides the pressure relief hole 1100 into a plurality of flow channels 1121. The gas entering from the inlet 1101 of the pressure relief hole 1100 will be divided into different flow channels 1121. The plurality of flow channels 1121 can be arranged along the circumferential direction of the valve body 110, and the plurality of flow channels 1121 are in one-to-one correspondence and communication with the openings 1131 of the plurality of whistle holes 1130. Thus, a part of the high-speed gas in each flow channel 1121 can be discharged from the corresponding whistle hole 1130 respectively, without interference with each other, which is beneficial to increasing the volume of the sound generated when the high-speed gas is discharged from the whistle holes 1130.

[0040] Among them, the flow channel 1121 can be located between the inlet 1101 and the outlet 1102 of the pressure relief hole 1100 and have a gap with the inlet 1101 and the outlet 1102 of the pressure relief hole 1100. Or, the flow channel 1121 can also extend from the inlet 1101 of the pressure relief hole 1100 to the outlet 1102.

[0041] In some embodiments, the flow dividing portion 120 may include a plurality of flow dividing plates 121 arranged circumferentially along the valve body 110. A flow passage 1121 is formed by enclosing the inner peripheral surface of the pressure relief hole 1100 between two adjacent flow dividing plates 121. Specifically, one side edge of the plurality of flow dividing plates 121 extends in the direction from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100 and is connected to each other. Two adjacent flow dividing plates 121 are arranged at an angle. The other sides of the plurality of flow dividing plates 121 are respectively connected to the inner peripheral surface of the pressure relief hole 1100, so that a flow passage 1121 is formed by enclosing the inner peripheral surface of the pressure relief hole 1100 between two adjacent flow dividing plates 121. Among them, the other side edge of the flow dividing plate 121 may be integrally connected to the valve body 110 to improve the connection stability between the flow dividing portion 120 and the valve body 110, so that the flow dividing portion 120 can stably divide the gas in the pressure relief hole 1100.

[0042] As Figures 1 to 4 shown, the pressure relief valve 100 may further include a sealing film 160 connected to the valve body 110. The sealing film 160 closes the inlet 1101 to prevent impurities such as water and dust from entering the housing cavity of the battery pack through the pressure relief hole 1100 of the pressure relief valve 100. Among them, the sealing film 160 may be a waterproof and breathable film, so that gas can pass through the sealing film 160, and prevent water, dust and other impurities from entering the cavity through the pressure relief hole 1100, so as to maintain the pressure difference between the cavity in the housing and the outside world, and avoid the situation that the sealing film 160 is burst due to the high pressure in the cavity while the battery module in the cavity does not experience thermal runaway.

[0043] Among them, a sharp portion 130 may be provided on the valve body 110 of the pressure relief valve 100. The sharp portion 130 is located on one side of the sealing film 160 along the direction from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100. The sharp portion 130 is configured to pierce the sealing film 160. Thus, when the battery module in the cavity of the housing experiences thermal runaway, resulting in a rapid increase in the pressure in the cavity of the housing, the sealing film 160 will expand and deform towards the sharp portion 130. When the sealing film 160 deforms to contact the sharp portion 130, the sharp portion 130 pierces the sealing film 160, so that the high-temperature and high-pressure gas in the cavity quickly discharges through the pressure relief hole 1100, and a part of the high-pressure gas in the pressure relief hole 1100 discharges through the whistle hole 1130 and generates a sound.

[0044] In some embodiments, a sharp portion 130 may be provided on one side of the flow dividing portion 120 facing the sealing film 160, so that the setting of the sharp portion 130 is more convenient, and there is no need to additionally provide a fixing structure in the pressure relief hole 1100 to fix the sharp portion 130.

[0045] Specifically, the sharp part 130 is located within the pressure relief hole 1100. The sharp part 130 includes a tip 131 and a connection end 132. The tip 131 and the connection end 132 of the sharp part 130 are sequentially distributed at both ends of the sharp part 130 along the direction from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100. The tip 131 of the sharp part 130 faces the sealing film 160. The connection end 132 of the sharp part 130 is connected to the side of the flow dividing part 120 facing the sealing film 160. Among them, the sharp part 130 is located at the side edge where multiple flow dividing plates 121 are connected to each other, so that the sharp part 130 is generally located at the center position of the pressure relief hole 1100. When the sharp part 130 contacts the expanded sealing film 160, it can puncture the sealing film 160 from the center position of the sealing film 160.

[0046] As Figure 3 and Figure 5 shown, the pressure relief hole 1100 includes a first hole section 1110 and a second hole section 1120 arranged along the direction from the inlet 1101 to the outlet 1102. The opening 1131 of the whistle hole 1130 is located in the second hole section 1120, that is, the opening 1131 of the whistle hole 1130 communicates with the second hole section 1120. The high-speed gas entering from the inlet 1101 of the pressure relief hole 1100 first flows through the first hole section 1110 and then enters the second hole section 1120. A part of the high-speed gas in the second hole section 1120 is discharged through the whistle hole 1130 to generate sound, and another part of the high-speed gas in the second hole section 1120 flows along the second hole section 1120 towards the outlet 1102 of the pressure relief hole 1100.

[0047] In some embodiments, the radial cross-sectional area of the first hole section 1110 of the pressure relief hole 1100 can be made smaller than the radial cross-sectional area of the second hole section 1120. The whistle hole 1130 reduces the radial cross-sectional area of the first hole section 1110, which can make the air flow velocity in the first hole section 1110 higher, and further increase the gas flow velocity transmitted from the first hole section 1110 to the second hole section 1120 and discharged through the whistle hole 1130 to generate a louder sound.

[0048] It should be noted that the radial cross-section of the first hole section 1110 and the second hole section 1120 refers to the area of the region enclosed by the contour line formed by the intersection of the inner circumferential surfaces of the first hole section 1110 and the second hole section 1120 with a plane perpendicular to the direction from the inlet 1101 to the outlet 1102 of the pressure relief hole 1100.

[0049] Among them, the radial cross-sectional area of the first hole section 1110 can be made smaller than or equal to 80 mm 2 so that the gas has a higher velocity when flowing through the first hole section 1110. The radial cross-sectional area of the first hole section 1110 can be 75 mm 2 , 60 mm 2 , 50 mm 2 , 30 mm2 And so on, which can be specifically determined according to the type of the battery pack.

[0050] In addition, the radial cross-sectional area of the first hole section 1110 can be made greater than or equal to 12 mm 2 , to avoid the radial cross-sectional area of the first hole section 1110 being too small, so that when the battery module has a thermal runaway, the high-temperature and high-pressure gas in the cavity cannot be discharged through the pressure relief hole 1100 in time. The radial cross-sectional area of the first hole section 1110 can be 20 mm 2 , 25 mm 2 , 40 mm 2 , 45 mm 2 And so on, which can be specifically determined according to the type of the battery pack.

[0051] In some embodiments, the minimum distance between the end of the first hole section 1110 far from the inlet 1101 and the opening 1131 of the whistle hole 1130 can be made less than or equal to 6 mm. Thus, the opening 1131 of the whistle hole 1130 can be made closer to the first hole section 1110. When the gas with a higher speed is discharged from the end of the first hole section 1110 far from the inlet 1101 of the pressure relief hole 1100, a part of the gas can quickly enter the whistle hole 1130 and be discharged through the whistle hole 1130 to generate a sound with a higher volume. Among them, the minimum distance between the end of the first hole section 1110 far from the inlet 1101 and the opening 1131 of the whistle hole 1130 can be 5.5 mm, 4 mm, etc., which can be specifically determined according to the structure of the valve body 110.

[0052] In addition, the minimum distance between the end of the first hole section 1110 far from the inlet 1101 and the opening 1131 can be made greater than or equal to 3 mm. To avoid the opening 1131 of the whistle hole 1130 being too close to the first hole section 1110, resulting in the opening 1131 of the whistle hole 1130 being blocked by the step at the connection of the first hole section 1110 and the second hole section 1120, so that the gas discharged from the end of the first hole section 1110 far from the inlet 1101 of the pressure relief hole 1100 cannot enter the whistle hole 1130 from the opening 1131, or the amount of gas entering is too small to generate a sound. Among them, the minimum distance between the end of the first hole section 1110 far from the inlet 1101 and the opening 1131 of the whistle hole 1130 can be 3.5 mm, 4.5 mm, etc., which can be specifically determined according to the structure of the valve body 110.

[0053] In some embodiments, when the pressure relief valve 100 includes a flow splitting portion 120, the flow splitting portion 120 can be disposed in the second hole section 1120, so that the flow splitting portion 120 divides the second hole section 1120 into a plurality of flow channels 1121. Specifically, the other sides of the plurality of flow splitting plates 121 of the flow splitting portion 120 can be respectively connected to the inner peripheral surface of the second hole section 1120, so that adjacent two flow splitting plates 121 and the inner peripheral surface of the second hole section 1120 enclose to form a flow channel 1121. Among them, the flow splitting plate 121 can extend from one end of the second hole section 1120 close to the first hole section 1110 towards the outlet 1102 of the pressure relief hole 1100. Thus, the gas discharged from one end of the first hole section 1110 far from the inlet 1101 of the pressure relief hole 1100 can immediately enter each flow channel 1121, so that the gas in the flow channel 1121 also has a relatively high speed.

[0054] In some embodiments, as Figures 1 to 5 shown, the pressure relief valve 100 may further include a clamping portion 140, and the clamping portion 140 protrudes from the end surface of the valve body 110 provided with the inlet 1101. Thus, the pressure relief valve 100 can be connected to the housing by clamping the clamping portion 140 to the housing, so as to quickly connect the pressure relief valve 100 to the housing. Among them, the number of the clamping portions 140 can be multiple, and the multiple clamping portions 140 are arranged along the circumferential direction of the inlet 1101 to improve the connection stability between the pressure relief valve 100 and the housing.

[0055] In some embodiments, as Figures 2 to 4 shown, the pressure relief valve 100 may further include a sealing member 170, and the sealing member 170 is disposed at one end of the valve body 110 provided with the inlet 1101. When the pressure relief valve 100 is connected to the housing, the gap between the valve body 110 and the housing can be sealed by the sealing member 170. Among them, the sealing member 170 can be disposed opposite to the end surface of the valve body 110 provided with the inlet 1101. When the pressure relief valve 100 is connected to the housing, the sealing member 170 is clamped between the housing and the end surface of the valve body 110 provided with the inlet 1101, so as to seal the gap between the housing and the end surface of the valve body 110 provided with the inlet 1101.

[0056] Specifically, an installation protrusion 150 can be protruded from the end surface of the valve body 110 provided with the inlet 1101, and the installation protrusion 150 extends along the circumferential direction of the inlet 1101 to form an annular structure. The sealing member 170 is an annular sealing ring and is sleeved on the installation protrusion 150, so that the sealing member 170 is disposed opposite to the end surface of the valve body 110 provided with the inlet 1101. The plurality of clamping portions 140 respectively protrude from one end of the installation protrusion 150 far from the valve body 110. And the plurality of clamping portions 140 are spaced along the circumferential direction of the installation protrusion 150.

[0057] Continue to refer to Figures 2 to 4, there is a gap between the edge of the inlet 1101 of the valve body 110 and the inner side surface 112 of the mounting protrusion 150. The sealing film 160 is located in the space formed by enclosing the mounting protrusion 150. The sealing film 160 is provided on the end face of one end of the valve body 110 where the inlet 1101 is provided and seals the inlet 1101. One side surface of the sealing film 160 can be pasted to the corresponding end face of the valve body 110 by pasting.

[0058] The embodiment of the present application also provides a battery pack, which includes a pressure relief valve. The specific structure of the pressure relief valve refers to the above embodiment. Since this battery pack adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0059] Among them, the battery pack includes a housing (not shown in the figure), a battery module (not shown in the figure), and a pressure relief valve 100. The housing includes a cavity. The battery module is arranged in the cavity. The pressure relief valve 100 is connected to the housing. The pressure relief hole 1100 of the valve body 110 of the pressure relief valve 100 is configured to communicate the cavity of the housing with the outside of the housing.

[0060] In the battery pack provided by the embodiment of the present application, the pressure relief hole 1100 of the valve body 110 of the pressure relief valve 100 is configured to communicate the cavity of the housing with the outside of the housing, and a whistle hole 1130 communicating with the pressure relief hole 1100 is opened on the outer peripheral surface of the valve body 110. When a thermal runaway occurs in the battery module, the high-temperature gas ejected from the battery cells of the battery module is discharged to the outside of the housing of the battery pack through the pressure relief hole 1100. During this process, a part of the high-temperature gas will be discharged from the whistle hole 1130 of the valve body 110 at a relatively high speed and generate a sound signal. Even if the battery management system fails and does not send a thermal runaway fault signal in time for prompt, the sound signal generated by the pressure relief valve 100 can be used for prompt.

[0061] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A pressure relief valve, characterized in that, The pressure relief valve is configured to be connected to the housing of the battery pack; the pressure relief valve includes a valve body, the valve body is provided with a through pressure relief hole, the pressure relief hole is configured to communicate the cavity of the housing and the outside, a whistle hole is provided on the outer peripheral surface of the valve body, the whistle hole extends to the inner peripheral surface of the pressure relief hole, and an opening communicating with the pressure relief hole is formed on the inner peripheral surface, and the whistle hole is configured to generate a sound when a part of the gas in the pressure relief hole is discharged.

2. The pressure relief valve according to claim 1, characterized in that, The pressure relief hole includes an opposite inlet and outlet, the valve body includes an inclined surface on one side of the whistle hole along the direction from the inlet to the outlet, the inclined surface extends from the outer peripheral surface to the edge of the opening, and in the direction from the outlet to the inlet, the inclined surface is inclined towards the pressure relief hole.

3. The pressure relief valve according to claim 1, characterized in that, The number of the whistle holes is multiple, and the multiple whistle holes are arranged along the circumferential direction of the valve body.

4. The pressure relief valve according to claim 3, characterized in that, The pressure relief valve further includes a flow dividing part arranged in the pressure relief hole, the flow dividing part divides the pressure relief hole into multiple flow channels, the multiple flow channels are arranged along the circumferential direction of the valve body, and the multiple flow channels are in one-to-one correspondence and communication with the openings of the multiple whistle holes.

5. The pressure relief valve according to claim 4, characterized in that, The flow dividing part includes multiple flow dividing plates arranged along the circumferential direction of the valve body, and adjacent two of the flow dividing plates and the inner peripheral surface of the pressure relief hole enclose to form the flow channel.

6. The pressure relief valve according to claim 4, characterized in that, The pressure relief hole includes an opposite inlet and outlet, the pressure relief valve further includes a sealing film connected to the valve body, the sealing film closes the inlet; a sharp part is arranged on one side of the flow dividing part facing the sealing film.

7. The pressure relief valve according to any one of claims 1 to 6, characterized in that, The pressure relief hole includes an opposite inlet and outlet, the pressure relief hole includes a first hole section and a second hole section arranged along the direction from the inlet to the outlet, the opening is located in the second hole section, and the radial cross-sectional area of the first hole section is smaller than that of the second hole section.

8. The pressure relief valve according to claim 7, characterized in that, The radial cross-sectional area of the first hole section is greater than or equal to 12 mm 2 ; the radial cross-sectional area of the first hole section is less than or equal to 80 mm 2 .

9. The pressure relief valve according to claim 7, wherein The minimum distance between the end of the first hole section far from the inlet and the opening is less than or equal to 6 mm, and the minimum distance between the end of the first hole section far from the inlet and the opening is greater than or equal to 3 mm.

10. A battery pack, characterized in that, Comprising: A housing, the housing includes a cavity; A battery module, arranged in the cavity; A pressure relief valve, the pressure relief valve is the pressure relief valve according to any one of claims 1 to 9, the pressure relief valve is connected to the housing, and the pressure relief hole of the pressure relief valve is configured to communicate the cavity and the outside of the housing.

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