Explosion-proof valve and battery pack

Abstract

An explosion-proof valve (100) and a battery pack (200). When thermal runaway occurs in the battery pack (200), a part of a gas flow formed by a thermal runaway gas can be discharged through a gas discharge channel (13), and the other part thereof enters a chamber (33) of a sound production portion (30) through a gas inlet (34) and flows back after reaching a first end (31). The backflow gas is blocked and reflected by a blocking portion (38) at the gas inlet (34). A part of the gas flow in the chamber (33) may be discharged to the outside of the chamber (33), and the gas flow in the chamber (33) vibrates and continuously produces sound, thereby achieving the aim of raising a thermal runaway alarm, and avoiding the occurrence of safety risks.

Description

Explosion-proof valve and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 12, 2024, with application number 202410053940.0 and application name “Explosion-proof Valve and Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to an explosion-proof valve and a battery pack. Background Art

[0003] When a battery pack experiences thermal runaway, the explosion-proof valve will open under the action of the airflow generated by the thermal runaway to discharge the gas generated by the thermal runaway. Although the discharged gas can be observed with the naked eye, it is difficult to observe in some locations with poor visibility or difficult to observe. In addition, the sound of the existing explosion-proof valve discharging the thermal runaway gas is relatively small, resulting in difficulty in timely detection of thermal runaway of the battery pack, posing a safety risk. Technical Solutions

[0004] According to a first aspect of an embodiment of the present application, there is provided an explosion-proof valve, the explosion-proof valve having a first direction, the explosion-proof valve comprising: a valve body, the valve body comprising a first surface and a second surface arranged opposite to each other along the first direction, an exhaust passage being provided in the valve body, the exhaust passage penetrating the valve body along the first direction; a cover body covering the first surface, the cover body being movable along the first direction to open or block the exhaust passage; a sound-emitting portion arranged on the second surface, the sound-emitting portion comprising a first end and a second end arranged opposite to each other along the first direction, a chamber being provided in the sound-emitting portion, the second surface connecting to and blocking the first end, an air inlet being provided at the second end and communicating with the chamber for airflow to enter the chamber, the sound-emitting portion having a second direction intersecting the first direction, the sound-emitting portion comprising a first sidewall and a second sidewall arranged opposite to each other along the second direction, a diversion port being provided on the first sidewall and communicating with the chamber for discharging part of the airflow in the chamber; wherein the air inlet is partially blocked to form a barrier to the airflow entering the chamber.

[0005] A second aspect of an embodiment of the present application provides a battery pack, comprising: a box body, wherein a accommodating cavity is provided in the box body, and a pressure relief hole connected to the accommodating cavity is opened on the box body; and an explosion-proof valve as described in the first aspect, wherein the explosion-proof valve cover is engaged with the pressure relief hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a schematic structural diagram of a first structure of an explosion-proof valve provided in an embodiment of the present application from a first angle;

[0007] FIG2 is a structural diagram of a first structure of an explosion-proof valve provided in an embodiment of the present application from a second angle;

[0008] FIG3 is a structural diagram of the first structure of the explosion-proof valve provided in an embodiment of the present application from a third angle;

[0009] FIG4 is a cross-sectional view taken along the line AA of FIG1 ;

[0010] FIG5 is a schematic diagram of airflow direction in a first structure of an explosion-proof valve provided in an embodiment of the present application;

[0011] FIG6 is a schematic diagram of a first structure of a sound-generating portion in a first structure of an explosion-proof valve provided in an embodiment of the present application;

[0012] FIG7 is a sectional view taken along line BB of FIG6 ;

[0013] FIG8 is a schematic diagram of the airflow direction of the sound-producing portion shown in FIG6 ;

[0014] FIG9 is a schematic diagram of a second structure of the sound-generating portion of the first structure of the explosion-proof valve provided in an embodiment of the present application;

[0015] FIG10 is a schematic diagram of a third structure of the sound-generating portion of the first structure of the explosion-proof valve provided in an embodiment of the present application;

[0016] FIG11 is a schematic structural diagram of a valve body in a first structure of an explosion-proof valve provided in an embodiment of the present application;

[0017] FIG12 is a schematic structural diagram of a second structure of an explosion-proof valve provided in an embodiment of the present application from a first angle;

[0018] FIG13 is a schematic structural diagram of a second structure of an explosion-proof valve provided in an embodiment of the present application from a second angle;

[0019] FIG14 is a cross-sectional view taken along line CC of FIG12;

[0020] FIG15 is a schematic diagram of airflow direction in the second structure of the explosion-proof valve provided in an embodiment of the present application;

[0021] FIG16 is an enlarged structural diagram of point D in FIG15;

[0022] FIG17 is a schematic structural diagram of a sound-generating portion provided with a blocking portion in a second structure of an explosion-proof valve provided in an embodiment of the present application;

[0023] FIG18 is a schematic structural diagram of a valve body in a second structure of an explosion-proof valve provided in an embodiment of the present application;

[0024] FIG19 is a schematic diagram of the combined structure of the rod, elastic member and cover of the explosion-proof valve provided in an embodiment of the present application;

[0025] FIG20 is a schematic diagram of the structure of the battery pack provided in an embodiment of the present application.

[0026] Explanation of reference numerals: 100, explosion-proof valve; 10, valve body, 11, first surface, 12, second surface, 121, receiving groove, 13, exhaust channel, 14, insertion hole, 15, mounting hole, 16, ring groove; 20, cover; 30, sound-emitting portion, 31, first end, 32, second end, 33, chamber, 34, air inlet, 35, first side wall, 36, second side wall, 37, diversion port, 371, first port, 3711, first end wall, 372, second port, 3721, second end wall, 37a, first wall, 37b, second wall, 38, sealing portion, 39, sealing member; 40, rod body, 41, first connecting end, 42, second connecting end, 421, raised portion; 50, elastic member; 60, sealing ring; 200, battery pack, 210, box body, 211, pressure relief hole; X, first direction, Y, second direction.

[0027] Implementation Methods of the Application

[0028] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0031] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the examples, "parallel" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between -1° and 1°. Furthermore, "perpendicular" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between 89° and 91°. Equal distances or equal angles refer to a state where the tolerance range is between -1% and 1%.

[0033] 1 to 11 , the explosion-proof valve 100 includes a valve body 10, a cover 20, and a sound-generating portion 30. Referring to Figures 1 , 3 , and 4 , the explosion-proof valve 100 has a first direction X.

[0034] In some embodiments, referring to Figures 1 to 5 and 11, the valve body 10 has a first surface 11 and a second surface 12 arranged opposite to each other along a first direction X. An exhaust channel 13 is provided in the valve body 10, and the exhaust channel 13 passes through the valve body 10 along the first direction X. The exhaust channel 13 is used to discharge thermal runaway gas when thermal runaway occurs in the battery pack, wherein the number of the exhaust channel 13 is at least one. Specifically, in the embodiment shown in Figures 2 and 5, the valve body 10 is in the shape of a disc, and the number of the exhaust channels 13 in the valve body 10 is four, and the four exhaust channels 13 are arranged at intervals along the circumferential direction of the valve body 10.

[0035] In some embodiments, referring to Figures 1 to 5 , the cover 20 is disposed on the first surface 11 of the valve body 10 , and the cover 20 is movable along a first direction X to open or block the exhaust passage 13 within the valve body 10 . Specifically, in the embodiments shown in Figures 1 to 5 , the gas generated by the battery cells within the battery pack during cycling is in a thermal runaway state. The air pressure generated by the airflow formed by the thermal runaway gas pushes the cover 20 , causing it to move along the first direction X until a gap exists between the cover 20 and the first surface 11 , the cover 20 is no longer in contact with the first surface 11 , and the explosion-proof valve 100 is in an open state. Referring to Figure 5 , the exhaust passage 13 is connected to the outside at one end near the first surface 11 in the first direction X, thereby allowing the thermal runaway gas to be discharged through the exhaust passage 13 , performing a pressure relief and exhaust operation. On the contrary, the battery cells in the battery pack generate gas during normal operation, and the air pressure of the airflow formed by the gas is not enough to push the cover body 20 to separate from the first surface 11, that is, the cover body 20 remains in contact with the first surface 11, the explosion-proof valve 100 is in a closed state, and the end of the exhaust channel 13 close to the first surface 11 in the first direction X is blocked by the cover body 20, and there is no need to perform pressure relief and exhaust action.

[0036] In some embodiments, referring to Figures 1 to 8, the shape of the sound-emitting portion 30 is cylindrical, and the sound-emitting portion 30 is provided on the second surface 12 of the valve body 10. The sound-emitting portion 30 includes a first end 31 and a second end 32 arranged opposite to each other along the first direction X. A chamber 33 is provided in the sound-emitting portion 30. The first end 31 of the sound-emitting portion 30 is blocked. Specifically, the first end 31 is blocked by the second surface 12 of the valve body 10. The second end 32 of the sound-emitting portion 30 is provided with an air inlet 34 connected to the chamber 33. The air inlet 34 is used to supply the gas generated by the battery cells inside the battery pack during the cycle operation. The airflow generated by the body enters the interior of the chamber 33. The sound-emitting portion 30 has a second direction Y intersecting with the first direction X. The sound-emitting portion 30 includes a first side wall 35 and a second side wall 36 arranged opposite each other along the second direction Y. The first side wall 35 is provided with a diverter 37 communicating with the chamber 33. The diverter 37 is used to discharge a portion of the airflow entering the chamber 33 from the air inlet 34. Specifically, in the embodiment shown in Figures 6 to 8, the first direction X and the second direction Y are orthogonal. The diverter 37 is provided at one end of the first side wall 35 in the first direction X, which is close to the air inlet 34. The air inlet 34 is partially blocked to block the airflow entering the chamber 33.

[0037] The battery cells in the battery pack will slowly generate gas during the cycle operation. The generated gas forms an airflow inside the battery pack, and the airflow generates air pressure. When the air pressure in the battery pack accumulates to a certain level and reaches the opening threshold of the explosion-proof valve, the explosion-proof valve will open to discharge the gas generated by the battery cells to exhaust and relieve pressure. When the battery cells experience thermal runaway, for example, a short circuit occurs between or inside the battery cells, causing the battery cells to release a large amount of gas in a short period of time and thermal runaway, the air pressure generated by the airflow formed by the thermal runaway gas is too high, and the explosion-proof valve cannot completely discharge the thermal runaway gas in a short period of time, resulting in danger. In this case, the battery pack needs to send an alarm signal to remind personnel to evacuate in time.

[0038] For thermal runaway alarms in battery packs, existing battery packs use a BMS (battery management system) to receive signals from various sensors within the battery pack, such as temperature sensors, gas sensors, pressure sensors, and voltage sensors, to perform multi-dimensional detection of the battery pack's interior. When a signal is abnormal, the BMS issues an alarm signal. However, this places high demands on the accuracy and reliability of the sensors, which can lead to false alarms and misjudgments. Furthermore, while the gas discharged from the explosion-proof valve can be observed with the naked eye, it is difficult to see in locations with poor visibility or difficult to observe. Furthermore, the sound of the thermal runaway gas discharged by the existing explosion-proof valve is relatively quiet, making it difficult to detect thermal runaway in the battery pack in a timely manner, posing a safety risk.

[0039] In contrast, the explosion-proof valve 100 provided in the embodiment of the present application has an exhaust channel 13 opened in the valve body 10, and a cover body 20 is provided on the first surface 11 of the valve body 10. The cover body 20 can open the exhaust channel 13 to discharge the thermal runaway gas when the battery pack has thermal runaway, and a sound-generating portion 30 is provided on the second surface 12 of the valve body 10. The sound-generating portion 30 has a chamber 33, a first end 31 of the sound-generating portion 30 is blocked, and an air inlet 34 communicating with the chamber 33 is provided at the second end 32, and a diversion port 37 is provided on the first side wall 35 of the sound-generating portion 30. When a battery cell in the battery pack has thermal runaway, referring to Figures 5 and 8, a part of the airflow formed by the thermal runaway gas is discharged from the explosion-proof valve 100 through the exhaust channel 13, and another part of the airflow formed by the thermal runaway gas enters the inner side of the chamber 33 through the air inlet 34. The airflow entering the inner side of the chamber 33 flows along the first direction X toward the first end 31. Due to the first The end 31 is blocked by the second surface 12 of the valve body 10, and the airflow flowing to the first end 31 is turned back and flows back along the first direction X toward the second end 32. Since the second end 32 is partially blocked, part of the airflow that flows back to the second end 32 is blocked and flows back to the first end 31. This reciprocating process forms an airflow vortex in the chamber 33, so that the sound-emitting part 30 can emit a sound, thereby achieving the effect of thermal runaway alarm. Moreover, the diversion port 37 can discharge part of the airflow entering the chamber 33 to the outside of the sound-emitting part 30, and the air inlet 34 can replenish fresh thermal runaway gas into the chamber 33, continuously forming an airflow vortex in the chamber 33, thereby enabling the sound-emitting part 30 to continuously emit sound when the battery pack produces thermal runaway, and continuously emit an alarm sound. Moreover, as the air pressure of the airflow formed by the thermal runaway gas increases, the alarm sound becomes louder, thereby ensuring the accuracy and reliability of the alarm and avoiding false alarms.

[0040] In some embodiments, referring to Figures 2, 5, and 11, a receiving groove 121 is defined on the second surface 12 of the valve body 10. The first end 31 of the sounding portion 30 is inserted into the receiving groove 121 to be blocked. The second end 32 of the sounding portion 30 is located on the side of the second surface 12 facing away from the first surface 11 in the first direction X. The diversion port 37 is located on the side of the first sidewall 35 proximal to the second end 32. In other words, both the second end 32 and the diversion port 37 of the sounding portion 30 are exposed on the second surface 12. The provision of the receiving groove 121 ensures the stability of the sounding portion 30 mounted on the second surface 12, preventing the sounding portion 30 from being dislodged by the impact of thermal runaway gases. The second end 32 and the diversion port 37 of the sounding portion 30 are exposed on the second surface 12, ensuring that the airflow generated by the thermal runaway gases continuously enters and exits the chamber 33, thereby ensuring that the sounding portion 30 continuously emits the alarm sound.

[0041] In some embodiments, referring to Figures 1 to 2 and Figures 4 to 10, the sound-emitting portion 30 includes a blocking portion 38, which is arranged in the chamber 33. Specifically, the blocking portion 38 is arranged at one end of the inner side of the chamber 33 close to the second end 32 in the first direction X. The blocking portion 38 can block part of the air inlet 34 to form a barrier to the airflow entering the inner side of the chamber 33, so that the airflow inside the chamber 33 can flow repeatedly between the blocking portion 38 and the blocked first end 31 to form an airflow vortex, thereby enabling the sound-emitting portion 30 to continuously emit an alarm sound.

[0042] In some embodiments, referring to Figures 11 to 18, the sound-emitting portion 30 is opened on the second surface 12 of the valve body 10, so that the sound-emitting portion 30 exists as a part of the valve body 10. Specifically, a groove is opened on the second surface 12 of the valve body 10 to form the sound-emitting portion 30. The inner cavity of the groove forms a chamber 33 of the sound-emitting portion 30. The two side walls of the groove opposite to each other in the second direction Y form a first side wall 35 and a second side wall 36 of the sound-emitting portion 30. The open end of the groove forms the second end 32 of the sound-emitting portion 30. The notch of the groove forms an air inlet 34 of the sound-emitting portion 30. The inner bottom wall of the groove forms the first end 31 of the sound-emitting portion 30. The sound-emitting portion 30 extends along the first direction X. The chamber 33 of the sound-emitting portion 30 is connected to the exhaust channel 13 through the diverter port 37, so that part of the airflow entering the chamber 33 through the air inlet 34 is discharged to the exhaust channel 13 through the diverter port 37, and then discharged from the explosion-proof valve 100 through the exhaust channel 13. By providing a groove on the second surface 12 of the valve body 10 to form the sounding portion 30 , the sounding portion 30 can be designed to continuously emit an alarm sound while saving space occupied by the explosion-proof valve 100 in the first direction X, thereby improving space utilization.

[0043] In some embodiments, the explosion-proof valve 100 further includes a blocking member 39, which can block part of the air inlet 34 to form a barrier to the airflow entering the inner side of the chamber 33 through the air inlet 34. Referring to Figures 12, 14 and 16, the blocking member 39 is a sealing ring, which is arranged on the second surface 12 of the valve body 10 along the circumferential direction of the valve body 10. There are four sound-emitting parts 30, and the four sound-emitting parts 30 are arranged at intervals along the circumferential direction of the valve body 10. The blocking member 39 forms a partial blockage of the air inlets 34 of the four sound-emitting parts 30 at the same time in the form of a sealing ring, thereby forming a barrier to the airflow entering the inner side of the chamber 33 through the air inlet 34. Moreover, the sealing member 39 in the form of a sealing ring can also ensure the airtightness of the installation between the explosion-proof valve 100 and the battery pack, ensuring that the thermal runaway gas can only be discharged from the exhaust channel 13.

[0044] In some embodiments, referring to FIG. 17 , the sound-emitting portion 30 further includes a blocking portion 38 , which is in contact with the air inlet 34 . The blocking portion 38 can partially block the air inlet 34 to block the airflow entering the chamber 33 through the air inlet 34 . Specifically, the blocking portion 38 is disposed at one end of the chamber 33 proximal to the air inlet 34 in the first direction X, and is in contact with the air inlet 34 . The sound-emitting portion 30 is formed in the form of a groove on the second surface 12 of the valve body 10 . Disposing the blocking portion 38 inside the chamber 33 effectively utilizes the space within the chamber 33 , reduces the space occupancy of the valve body 10 in the first direction X, and improves the ease of assembly between the explosion-proof valve 100 and the battery pack.

[0045] In some embodiments, along the thickness direction of the first side wall 35, that is, along the second direction Y of the sound-emitting portion 30, the diverter port 37 includes a first port 371 and a second port 372 arranged opposite to each other. The first port 371 includes two first end walls 3711 arranged opposite to each other along the first direction X, and the second port 372 includes two second end walls 3721 arranged opposite to each other along the first direction X. The spacing between the two first end walls 3711 in the first direction X is H1 mm, and the spacing between the two second end walls 3721 in the first direction X is H2 mm. Referring to Figures 7 and 17, the relationship between H1 and H2 satisfies: H1<H2, that is, the opening area of ​​the first port 371 is smaller than the opening area of ​​the second port 372. In this way, when the airflow in the chamber 33 is discharged from the sound-emitting portion 30 through the diverter port 37, a jet can be formed at the diverter port 37, thereby accelerating the discharge speed of the airflow in the chamber 33, thereby increasing the circulation speed of the airflow in the chamber 33, and improving the alarm volume of the sound-emitting portion 30 when thermal runaway occurs in the battery pack.

[0046] In some embodiments, referring to Figure 9, the relationship between H1 and H2 satisfies: H1 = H2, that is, the opening area of ​​the first port 371 is the same as the opening area of ​​the second port 372, so that the air flow in the chamber 33 is evenly discharged to the outside of the sound-emitting part 30 through the diversion port 37, ensuring the continuity of the air flow circulation in the chamber 33, and further ensuring the continuity of the alarm sound emitted by the sound-emitting part 30.

[0047] In some embodiments, referring to Figure 10, the relationship between H1 and H2 satisfies: H1>H2, that is, the opening area of ​​the first port 371 is larger than the opening area of ​​the second port 372, so that when the airflow in the chamber 33 is discharged to the second port 372, it is restricted at the second port 372, thereby increasing the exhaust pressure of the airflow discharge diversion port 37, while ensuring the continuity of the airflow circulation in the chamber 33, and improving the volume of the alarm sound emitted by the sound-emitting part 30.

[0048] In some embodiments, the diverter 37 includes a first wall 37a and a second wall 37b arranged opposite each other along the first direction X. Referring to Figures 6, 7, and 17, the first wall 37a is tilted to form an inclined surface, and the second wall 37b is a plane. The cross-sectional shape of the diverter 37 is a right-angled trapezoid, so that the relationship between H1 and H2 satisfies: H1 < H2. When processing the sound-emitting portion 30, it is only necessary to perform tilted cutting on the diverter 37 to form the inclined surface design of the first wall 37a, so that the opening area of ​​the first port 371 is smaller than the opening area of ​​the second port 372, thereby accelerating the discharge speed of the airflow in the chamber 33. The processing method is simple and convenient, and the manufacturing cost of the sound-emitting portion 30 is low. In other implementations of the present application, the first wall 37a is a plane, and the second wall 37b is tilted to form an inclined surface. In other implementations of the present application, both the first wall 37a and the second wall 37b are tilted to form inclined surfaces. It is only necessary to satisfy H1 < H2.

[0049] In some embodiments, referring to FIG10 , the first wall 37a is inclined to form an inclined surface, the second wall 37b is flat, and the cross-sectional shape of the diverter 37 is a right-angled trapezoid. This ensures that the relationship between H1 and H2 satisfies: H1>H2. During processing of the sound-generating portion 30, only the diverter 37 needs to be cut obliquely to form the inclined surface of the first wall 37a. This results in the opening area of ​​the first port 371 being larger than the opening area of ​​the second port 372. This restricts the airflow within the chamber 33 from being discharged to the second port 372, thereby increasing the exhaust pressure of the airflow out of the diverter 37. This ensures the continuity of the airflow circulation within the chamber 33 while also increasing the volume of the alarm sound emitted by the sound-generating portion 30. In other implementations of the present application, the first wall 37a is flat, and the second wall 37b is inclined to form an inclined surface. In other implementations of the present application, both the first wall 37a and the second wall 37b are inclined to form inclined surfaces. The requirement that H1>H2 is sufficient is sufficient.

[0050] In some embodiments, referring to Figures 1 to 5, 12 to 15 and 19, the explosion-proof valve 100 further includes a rod body 40. Referring to Figures 14 and 19, the rod body 40 includes a first connecting end 41 and a second connecting end 42 arranged opposite to each other along the first direction X. Referring to Figures 11 and 18, a socket 14 is provided on the valve body 10, and the socket 14 passes through the valve body 10 along the first direction X. The rod body 40 is inserted into the socket 14. Specifically, the first connecting end 41 of the rod body 40 is inserted into the socket 14, and the cover body 20 is connected to the first connecting end 41. The rod body 40 can move back and forth along the first direction X, thereby driving the cover body 20 to move back and forth along the first direction X, thereby realizing opening or blocking of the exhaust channel 13.

[0051] In some embodiments, referring to Figures 2, 11 to 12 and 18, the number of the sockets 14 on the valve body 10 is one, the number of the exhaust channels 13 is four, the four exhaust channels 13 are arranged at intervals along the circumferential direction of the valve body 10, the four exhaust channels 13 surround the sockets 14, the number of the sounding parts 30 is four, the four sounding parts 30 are arranged at intervals along the circumferential direction of the valve body 10, the four sounding parts 30 surround the four exhaust channels 13, and along the radial direction of the sockets 14, the sounding parts 30 and the exhaust channels 13 are arranged at intervals.

[0052] In some embodiments, referring to Figures 11 and 18, a mounting hole 15 is provided on the second side 12 of the valve body 10. Specifically, in the embodiments shown in Figures 11 and 18, there are four mounting holes 15, which are arranged at intervals along the circumferential direction of the valve body 10. A mounting hole 15 is provided between two adjacent exhaust channels 13 along the circumferential direction of the valve body 10, wherein the mounting hole 15 is a threaded hole, which is connected to the battery pack by bolts to realize the assembly between the explosion-proof valve 100 and the battery pack, thereby improving the assembly convenience.

[0053] 3 to 4 and 14 to 15 , the cover 20 is threadedly connected to the first connecting end 41 of the rod 40 , thereby achieving detachable assembly of the cover 20 and the rod 40 and improving the convenience of repair and maintenance.

[0054] In some embodiments, referring to Figures 2, 12, 14 and 19, the explosion-proof valve 100 further includes an elastic member 50. In the first direction X, the second connecting end 42 of the rod body 40 is located on the side of the second surface 12 of the valve body 10 away from the first surface 11. The elastic member 50 is sleeved on the rod body 40. One end of the elastic member 50 in the first direction X is abutted against the second connecting end 42, and the other end of the elastic member 50 in the first direction X is abutted against the second surface 12 of the valve body 10.

[0055] Gas generated by the battery cells in the battery pack during the cycling process forms an airflow within the battery pack. The airflow pushes the second connecting end 42 of the rod body 40 along the first direction X, applying a thrust along the first direction X to the rod body 40. When the air pressure of the airflow reaches the opening threshold of the explosion-proof valve 100, or even exceeds the opening threshold of the explosion-proof valve 100 to form a thermal runaway airflow, the thrust generated causes the first connecting end 41 of the rod body 40 to extend out of the exhaust channel 13 along the first direction X. During the movement of the rod body 40, the elastic member 50 is squeezed, causing the elastic member 50 to produce elastic deformation. In addition, the movement of the rod body 40 drives the cover body 20 to move accordingly to open the exhaust channel of the valve body 10, and the explosion-proof valve 100 performs a pressure relief and exhaust action. When the airflow is discharged through the exhaust passage 13 to a pressure lower than the opening threshold of the explosion-proof valve 100, the thrust of the airflow on the rod 40 is unable to push the rod 40. The elastic deformation of the elastic member 50 causes the first connecting end 41 of the rod 40 to retract into the exhaust passage 13 along the first direction X, and the explosion-proof valve 100 returns to the closed state. The design of the elastic member 50 thus enables the explosion-proof valve 100 to open and close automatically, improving the degree of automation.

[0056] In some embodiments, the elastic member 50 is a spring.

[0057] In some embodiments, referring to Figure 19, the second connecting end 42 of the rod body 40 is provided with a protrusion 421, which protrudes along the circumferential direction of the second connecting end 42 and is provided on the outer wall of the second connecting end 42. The end of the elastic member 50 away from the second surface 12 in the first direction X is abutted against the protrusion 421. The design of the protrusion 421 can ensure the stability of the connection between the elastic member 50 and the second connecting end 42, thereby ensuring that the rod body 40 can smoothly extend or retract along the first direction X.

[0058] In some embodiments, referring to Figures 11 and 18, the explosion-proof valve 100 also includes a sealing ring 60. The second surface 12 of the valve body 10 is provided with an annular groove 16. The annular groove 16 surrounds the sound-emitting portion 30 along the circumferential direction of the valve body 10. The sealing ring 60 is embedded in the annular groove 16. The design of the sealing ring 60 can ensure the airtightness between the explosion-proof valve 100 and the battery pack when the explosion-proof valve 100 is assembled with the battery pack, so that when the explosion-proof valve 100 is performing pressure relief work, the airflow can only be discharged from the exhaust channel 13 of the explosion-proof valve 100, thereby ensuring the smooth operation of the explosion-proof valve 100.

[0059] In some embodiments, the present application also provides a battery pack 200. Referring to Figure 20, the battery pack 200 includes a box body 210 and the explosion-proof valve 100 as described above. A accommodating cavity (not shown in the figure) is provided in the box body 210. The accommodating cavity is used to accommodate battery cells. A pressure relief hole 211 connected to the accommodating cavity is opened on the side wall of the box body 210. The explosion-proof valve 100 covers the pressure relief hole 211. Specifically, the second side 12 of the valve body 10 of the explosion-proof valve 100 covers the pressure relief hole 211 to form a seal for the pressure relief hole 211.

[0060] The above is a detailed introduction to the technical solutions provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An explosion-proof valve, the explosion-proof valve having a first direction, wherein, The explosion-proof valve comprises: a valve body, the valve body having a first surface and a second surface arranged opposite to each other along the first direction, an exhaust passage being arranged in the valve body, and the exhaust passage penetrating the valve body along the first direction; a cover body, which is disposed on the first surface and can move along the first direction to open or block the exhaust passage; A sound-emitting portion is arranged on the second surface, the sound-emitting portion includes a first end and a second end arranged opposite to each other along the first direction, a chamber is arranged in the sound-emitting portion, the second surface is connected to and blocks the first end, an air inlet connected to the chamber is provided at the second end to allow airflow to enter the chamber, the sound-emitting portion has a second direction intersecting with the first direction, the sound-emitting portion includes a first side wall and a second side wall arranged opposite to each other along the second direction, a diversion port connected to the chamber is provided on the first side wall to discharge part of the airflow in the chamber; The air inlet portion is blocked to form a barrier to the air flow into the chamber.

2. The explosion-proof valve according to claim 1, wherein, The second surface is provided with a receiving groove, and the sound-generating part is inserted into the receiving groove; In the first direction, the first end is inserted into the accommodating groove, the second end is located on a side of the second surface away from the first surface, and the diversion port is located on a side of the first side wall close to the second end.

3. The explosion-proof valve according to claim 2, wherein, The sound-generating portion includes a blocking portion, and the blocking portion can block a portion of the air inlet to form a barrier to the airflow inside the chamber.

4. The explosion-proof valve according to claim 1, wherein, The sound-emitting portion is disposed on the second surface, and the sound-emitting portion extends along the first direction; The chamber is in communication with the exhaust channel through the diversion port so as to discharge part of the airflow in the chamber to the exhaust channel.

5. The explosion-proof valve according to claim 4, wherein, The explosion-proof valve further comprises a blocking member, which is arranged on the second surface and can block a portion of the air inlet to form a barrier to the airflow entering the inner side of the chamber.

6. The explosion-proof valve according to claim 4, wherein, The sound-generating part further includes a blocking part, which is connected to the air inlet. The blocking part can block part of the air inlet to form a barrier to the airflow inside the chamber.

7. The explosion-proof valve according to claim 1, wherein, Along the thickness direction of the first side wall, the diversion port includes a first port and a second port which are arranged opposite to each other; The first port includes two first end walls arranged opposite to each other along the first direction, and the distance between the two first end walls in the first direction is H1 mm. The second port includes two second end walls arranged opposite to each other along the first direction, and the distance between the two second end walls in the first direction is H2 mm. The relationship between H1 and H2 satisfies any one of the following three conditions: (a) H1<H2; (b) H1>H2; (c)H1=H2.

8. The explosion-proof valve according to claim 7, wherein, The diversion port includes a first wall and a second wall arranged opposite to each other along the first direction, and the first wall is inclined to form an inclined surface, so that the relationship between H1 and H2 satisfies any one of the following two conditions: (a) H1<H2; (b)H1>H2.

9. The explosion-proof valve according to claim 8, wherein, The diversion port includes a first wall and a second wall arranged opposite to each other along the first direction, and the second wall is inclined to form an inclined surface, so that the relationship between H1 and H2 satisfies any one of the following two conditions: (a) H1<H2; (b)H1>H2.

10. The explosion-proof valve according to claim 8, wherein, The diversion port includes a first wall and a second wall arranged opposite to each other along the first direction, and the first wall and the second wall are arranged to be inclined to form an inclined surface, so that the relationship between H1 and H2 satisfies any one of the following two conditions: (a) H1<H2; (b)H1>H2.

11. The explosion-proof valve according to claim 1, wherein, The explosion-proof valve comprises a rod body, a plug hole is formed on the valve body, the plug hole penetrates the valve body along the first direction, the rod body is inserted into the plug hole, the rod body comprises a first connecting end and a second connecting end arranged opposite to each other along the first direction, and the cover body is connected to the first connecting end; The rod body can reciprocate along the first direction.

12. The explosion-proof valve according to claim 11, wherein, The explosion-proof valve further comprises an elastic member, wherein in the first direction, the second connecting end is located on a side of the second surface away from the first surface; The elastic member is sleeved on the rod body, one end of the elastic member in the first direction abuts against the second connecting end, and the other end of the elastic member in the first direction abuts against the second surface.

13. A battery pack, wherein, include: A box body, wherein a receiving cavity is arranged in the box body, and a pressure relief hole communicating with the receiving cavity is opened on the box body; as well as The explosion-proof valve according to any one of claims 1 to 12, wherein the explosion-proof valve cover is engaged with the pressure relief hole.

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