CN118099654A - Explosion-proof valve and battery pack - Google Patents

Abstract

The present application discloses an explosion-proof valve and a battery pack, wherein the explosion-proof valve is provided with a valve body and a cover body, wherein an exhaust channel is provided in the valve body along a first direction, and the cover body can open or block the exhaust channel, a sound-emitting portion is provided on the valve body, a chamber is provided in the sound-emitting portion, a second surface is connected to and blocks the first end, an air inlet is provided at the second end, a diversion port is provided on the first side wall, and the air inlet is partially blocked. When thermal runaway occurs in the battery pack, a part of the airflow formed by the thermal runaway gas can be discharged through the exhaust channel, and the other part enters the chamber of the sound-emitting portion through the air inlet and flows back after reaching the first end. The refluxed airflow is blocked and reflected by the blockage at the air inlet, and so on and so forth. The airflow in the chamber forms an airflow vortex, and a part of the airflow in the chamber can be discharged to the outside of the chamber through the diversion port, so that new thermal runaway gas continuously enters the interior of the chamber, the airflow in the chamber vibrates and continuously emits sound, thereby achieving the purpose of thermal runaway alarm and avoiding the occurrence of safety risks.

Description

Explosion-proof valve and battery pack

Technical Field

The present invention relates to the technical field of batteries, and in particular to an explosion-proof valve and a battery pack.

Background technique

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 vision or difficult to observe. In addition, the sound of the existing explosion-proof valve discharging the thermal runaway gas is small, resulting in the battery pack thermal runaway being difficult to detect in time, posing a safety risk.

Summary of the invention

The object of the present invention is to provide an explosion-proof valve and a battery pack to solve the problem that the explosion-proof valve in the current battery pack has a low sound when discharging thermal runaway gas, which is difficult to detect in time and leads to safety risks.

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 arranged in the valve body, the exhaust passage penetrating the valve body along the first direction; a cover body, which is arranged on the first surface, the cover body being movable along the first direction to open or block the exhaust passage; a sound-emitting part, which is arranged on the second surface, the sound-emitting part comprising a first end and a second end arranged opposite to each other along the first direction, a chamber being arranged in the sound-emitting part, the second surface connecting and blocking the first end, an air inlet communicating with the chamber being provided at the second end for airflow to enter the chamber, the sound-emitting part having a second direction intersecting with the first direction, the sound-emitting part comprising a first side wall and a second side wall arranged opposite to each other along the second direction, a diversion port communicating with the chamber being provided on the first side wall 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.

Optionally, the second surface is provided with a receiving groove, and the sound-emitting part is inserted in the receiving groove; in the first direction, the first end is inserted in the receiving groove, the second end is located on the side of the second surface facing away from the first surface, and the diversion port is located on the side of the first side wall close to the second end.

Optionally, the sound-emitting portion includes a blocking portion, which can block a portion of the air inlet to form a barrier to the airflow inside the chamber.

Optionally, the sound-emitting portion is provided on the second surface, and the sound-emitting portion extends along the first direction; the chamber is connected to the exhaust channel through the diversion port to discharge part of the airflow in the chamber to the exhaust channel.

Optionally, the explosion-proof valve further comprises a blocking member, wherein the blocking member is disposed on the second surface, and the blocking member can block a portion of the air inlet to form a barrier to the airflow entering the inner side of the chamber.

Optionally, the sound-emitting part further includes a blocking part, which is connected to the air inlet, and the blocking part can block a part of the air inlet to form a barrier to the airflow inside the chamber.

Optionally, along the thickness direction of the first side wall, the diversion port includes a first port and a second port that are oppositely arranged; the first port includes two first end walls that are oppositely arranged 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 that are oppositely arranged along the first direction, and the distance between the two second end walls in the first direction is _H2 mm, and the relationship between _H1 and _H2 satisfies any one of the following three situations:

(a) H ₁ ＜H ₂ ;

(b) H ₁ >H ₂ ;

(c) H ₁ =H ₂ .

Optionally, the diversion port includes a first wall and a second wall arranged opposite to each other along the first direction, and at least one of the first wall 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) H ₁ ＜H ₂ ;

(b) H ₁ >H ₂ .

Optionally, the explosion-proof valve includes a rod body, a socket is provided on the valve body, the socket passes through the valve body along the first direction, the rod body is inserted into the socket, the rod body includes a first connecting end and a second connecting end relatively arranged along the first direction, and the cover body is connected to the first connecting end; the rod body can move reciprocatingly along the first direction.

Optionally, the explosion-proof valve also includes an elastic member, and in the first direction, the second connecting end is located on the 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 is abutted against the second connecting end, and the other end of the elastic member in the first direction is abutted against the second surface.

A second aspect of an embodiment of the present application provides a battery pack, comprising: a box body, wherein a accommodating cavity is disposed within 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.

In summary, the embodiments of the present application provide an explosion-proof valve and a battery pack having the explosion-proof valve, wherein the explosion-proof valve is provided with a valve body and a cover body, an exhaust channel is provided in the valve body along a first direction, the cover body can move along the first direction to open or block the exhaust channel, and when the exhaust channel is opened, thermal runaway gas can be discharged when the battery pack has thermal runaway, and a sounding portion is provided on the valve body, a chamber is provided in the sounding portion, a first end of the sounding portion is blocked, an air inlet is provided at the second end of the sounding portion, a diversion port is provided on the first side wall of the sounding portion, and the air inlet is partially blocked, so that when thermal runaway occurs in the battery pack, a part of the airflow formed by the thermal runaway gas can be discharged through the exhaust channel In order to ensure the safe use of the battery pack, another part of the airflow formed by the thermal runaway gas can enter the chamber of the sound-emitting part through the air inlet and flow back after reaching the first end. The returned airflow is blocked and reflected by the blockage at the air inlet, and so on. The airflow in the chamber forms an airflow vortex, and a part of the airflow entering the chamber can be discharged to the outside of the chamber through the diversion port, so that new thermal runaway gas continuously enters the chamber, the airflow in the chamber vibrates and continuously makes a sound, thereby achieving the purpose of thermal runaway alarm, and the thermal runaway of the battery pack can be discovered in time, and the driver and passengers are warned of the danger in time, so that they can evacuate in time to avoid the occurrence of safety risks.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

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

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

3 is a schematic structural diagram of a first structure of an explosion-proof valve provided in an embodiment of the present application from a third angle;

Fig. 4 is a cross-sectional view taken along the line A-A of Fig. 1;

FIG5 is a schematic diagram of air flow direction in a first structure of an explosion-proof valve provided in an embodiment of the present application;

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

Fig. 7 is a cross-sectional view taken along the line B-B of Fig. 6;

FIG8 is a schematic diagram of the airflow direction of the sound-emitting part shown in FIG6;

9 is a schematic diagram of a second structure of the sound-generating part of the first structure of the explosion-proof valve provided in an embodiment of the present application;

10 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;

11 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;

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;

13 is a schematic structural diagram of a second angle of view of a second structure of an explosion-proof valve provided in an embodiment of the present application;

Fig. 14 is a cross-sectional view taken along the line C-C of Fig. 12;

FIG15 is a schematic diagram of air flow direction in the second structure of the explosion-proof valve provided in an embodiment of the present application;

FIG16 is an enlarged structural schematic diagram of D in FIG15;

17 is a schematic structural diagram of a sound-generating part provided with a blocking part in the second structure of the explosion-proof valve provided in an embodiment of the present application;

18 is a schematic diagram of the structure of a valve body in a second structure of an explosion-proof valve provided in an embodiment of the present application;

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

FIG. 20 is a schematic diagram of the structure of the battery pack provided in an embodiment of the present application.

Description of main reference numerals:

100. Explosion-proof valve;

10. valve body, 11. first surface, 12. second surface, 121. receiving groove, 13. exhaust passage, 14. insertion hole, 15. mounting hole, 16. ring groove;

20. Cover body;

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. blocking portion, 39. blocking member;

40. rod body, 41. first connecting end, 42. second connecting end, 421. protrusion;

50. Elastic parts;

60. Sealing ring;

200, battery pack, 210, box body, 211, pressure relief hole;

X, first direction, Y, second direction.

Detailed ways

In order to make the purpose, technical solution and beneficial effects of this application clearer, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

In some embodiments, an explosion-proof valve 100 is provided. Referring to Figures 1 to 11 , the explosion-proof valve 100 includes a valve body 10, a cover body 20 and a sound-generating part 30. Referring to Figures 1 , 3 and 4 , the explosion-proof valve 100 has a first direction X.

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, and an exhaust channel 13 is provided in the valve body 10. The exhaust channel 13 runs 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 embodiments 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.

In some embodiments, referring to FIGS. 1 to 5 , the cover 20 is disposed on the first surface 11 of the valve body 10 , and the cover 20 can move along the first direction X to open or block the exhaust passage 13 in the valve body 10 . Specifically, in the embodiments shown in FIGS. 1 to 5 , the gas generated by the battery cells in the battery pack during the cycle is in a thermal runaway state, and the air pressure generated by the airflow formed by the thermal runaway gas pushes the cover 20 so that the cover 20 moves along the first direction X until there is a gap between the cover 20 and the first surface 11 , the cover 20 does not fit the first surface 11 , and the explosion-proof valve 100 is in an open state. Referring to FIG. 5 , the exhaust passage 13 is connected to the outside at one end close to the first surface 11 in the first direction X, so that the thermal runaway gas is discharged through the exhaust passage 13 , and the pressure relief exhaust action is performed. 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 sufficient to push the cover body 20 to separate the cover body 20 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.

In some embodiments, referring to FIGS. 1 to 8 , the shape of the sound-emitting portion 30 is columnar, and the sound-emitting portion 30 is disposed 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 disposed opposite to each other along the first direction X. A chamber 33 is disposed in the sound-emitting portion 30, and 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, and an air inlet 34 communicating with the chamber 33 is provided at the second end 32 of the sound-emitting portion 30. The air inlet 34 is used to supply the gas generated by the battery cells in the battery pack during the cycle operation. The airflow formed by the body enters the interior of the chamber 33, the sound-generating part 30 has a second direction Y intersecting with the first direction X, and the sound-generating part 30 includes a first side wall 35 and a second side wall 36 arranged opposite to each other along the second direction Y, and a diverter 37 communicating with the chamber 33 is provided on the first side wall 35, and the diverter 37 is used to discharge a part of the airflow entering the chamber 33 from the air inlet 34. Specifically, in the embodiment shown in FIGS. 6 to 8, the first direction X is orthogonal to the second direction Y, and the diverter 37 is provided at one end of the first side wall 35 close to the air inlet 34 in the first direction X. Among them, the air inlet 34 is partially blocked to form a barrier to the airflow entering the chamber 33.

The battery cells in the battery pack will slowly generate gas during the cyclic operation process. 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 experience 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 a danger. In this case, the battery pack needs to send an alarm signal to remind personnel to evacuate in time.

For thermal runaway alarms of battery packs, existing battery packs receive various sensors in the battery packs through BMS (battery management system), such as temperature sensors, gas sensors, pressure sensors, and voltage sensors, to perform multi-dimensional detection of the inside of the battery pack. When the signal is abnormal, an alarm signal is issued through the BMS, but the sensing accuracy and reliability of the sensor are required to be high, and there may be a risk of false alarms leading to misjudgment. In addition, although the gas discharged from the explosion-proof valve can be observed with the naked eye, it is difficult to observe in some places with poor vision or difficult to observe, and the sound of the thermal runaway gas discharged by the existing explosion-proof valve is relatively small, which makes it difficult to detect the thermal runaway of the battery pack in time, posing a safety risk.

On the other hand, the explosion-proof valve 100 provided in the embodiment of the present application is provided with an exhaust channel 13 in the valve body 10, and a cover body 20 is provided on the first surface 11 of the valve body 10. When the battery pack has thermal runaway, the cover body 20 can open the exhaust channel 13 to discharge the thermal runaway gas, and a sound-emitting portion 30 is provided on the second surface 12 of the valve body 10. The sound-emitting portion 30 has a chamber 33, the first end 31 of the sound-emitting portion 30 is blocked, and the second end 32 is provided with an air inlet 34 connected to the chamber 33, and a diversion port 37 is provided on the first side wall 35 of the sound-emitting portion 30. When the 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 to the direction close to the second end 32. Since the second end 32 is partially blocked, a part of the airflow that flows back to the second end 32 is blocked and flows back to the first end 31, and so on and so forth, forming an airflow vortex in the chamber 33, so that the sound-emitting part 30 can make a sound, thereby achieving the effect of thermal runaway alarm, and the diversion port 37 can discharge a 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, and continuously form an airflow vortex in the chamber 33, so that the sound-emitting part 30 can continuously make a sound when the battery pack produces thermal runaway, and continuously make an alarm sound, and 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.

In some embodiments, referring to FIG. 2 , FIG. 5 and FIG. 11 , the second surface 12 of the valve body 10 is provided with a receiving groove 121, 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 away from the first surface 11 in the first direction X, and the diversion port 37 is located on the side of the first side wall 35 close to the second end 32. In other words, the second end 32 and the diversion port 37 of the sounding portion 30 are both exposed on the second surface 12. The provision of the receiving groove 121 can ensure the stability of the sounding portion 30 installed on the second surface 12, and prevent the sounding portion 30 from falling off due to the impact of the thermal runaway gas. The second end 32 and the diversion port 37 of the sounding portion 30 are both exposed on the second surface 12, which can ensure that the airflow formed by the thermal runaway gas continues to enter and exit the chamber 33, thereby ensuring that the sounding portion 30 continues to emit an alarm sound.

In some embodiments, referring to Figures 1 to 2 and Figures 4 to 10, the sound-emitting portion 30 includes a blocking portion 38, and the blocking portion 38 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 repeatedly flow between the blocking portion 38 and the blocked first end 31 to form an airflow vortex, thereby allowing the sound-emitting portion 30 to continuously emit an alarm sound.

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, and 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, and 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, and the chamber 33 of the sound-emitting portion 30 is connected to the exhaust channel 13 through the diverter port 37, so as to discharge part of the airflow entering the chamber 33 through the air inlet port 34 to the exhaust channel 13 through the diverter port 37, and then discharge the explosion-proof valve 100 through the exhaust channel 13. The structural design of the sounding part 30 is formed by providing a groove on the second surface 12 of the valve body 10 , which can save the space occupied by the explosion-proof valve 100 in the first direction X while ensuring that the sounding part 30 continuously emits an alarm sound, thereby improving space utilization.

In some embodiments, the explosion-proof valve 100 also 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. The number of the sound-emitting parts 30 is four, and the four sound-emitting parts 30 are arranged at intervals along the circumferential direction of the valve body 10. The blocking member 39 simultaneously forms a partial blockage of the air inlets 34 of the four sound-emitting parts 30 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. In addition, 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.

In some embodiments, referring to FIG. 17 , the sound-generating portion 30 further includes a blocking portion 38, which is in contact with the air inlet 34. 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 through the air inlet 34. Specifically, the blocking portion 38 is disposed at one end of the inner side of the chamber 33 close to the air inlet 34 in the first direction X, and the blocking portion 38 is in contact with the air inlet 34. The sound-generating portion 30 is provided in the form of a groove on the second surface 12 of the valve body 10. The blocking portion 38 is disposed inside the chamber 33, which can effectively utilize the space inside the chamber 33, reduce the space occupancy rate of the valve body 10 in the first direction X, and improve the convenience of assembly between the explosion-proof valve 100 and the battery pack.

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 that are oppositely arranged. The first port 371 includes two first end walls 3711 that are oppositely arranged along the first direction X, and the second port 372 includes two second end walls 3721 that are oppositely arranged 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.

9 , the relationship between H ₁ and H ₂ satisfies: H ₁ =H ₂ , 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 airflow in the chamber 33 is evenly discharged to the outside of the sound-emitting portion 30 through the diversion port 37 , ensuring the continuity of the airflow circulation in the chamber 33 , and further ensuring the continuity of the alarm sound emitted by the sound-emitting portion 30 .

In some embodiments, referring to FIG. 10 , the relationship between H ₁ and H ₂ satisfies: H ₁ >H, 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 branch port 37, while ensuring the continuity of the airflow circulation in the chamber 33, and at the same time, increasing the volume of the alarm sound emitted by the sound-emitting part 30.

In some embodiments, the diverter 37 includes a first wall 37a and a second wall 37b arranged opposite to each other along the first direction X. Referring to FIG. 6, FIG. 7 and FIG. 17, the first wall 37a is inclined 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 part 30, it is only necessary to perform an inclined cutting at the diverter 37 to form an 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, so as to accelerate 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 part 30 is low. In other implementations of the present application, the first wall 37a is a plane, and the second wall 37b is inclined to form an inclined surface. In other implementations of the present application, the first wall 37a and the second wall 37b are both inclined to form an inclined surface. It only needs to satisfy _H1 < _H2 .

In some embodiments, referring to FIG. 10 , the first wall 37a is inclined to form an inclined surface, the second wall 37b is a plane, and the cross-sectional shape of the diverter 37 is a right-angle 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 inclined cutting at 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 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 out of the diverter 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 portion 30. In other implementations of the present application, the first wall 37a is a plane, and the second wall 37b is inclined to form an inclined surface. In other implementations of the present application, the first wall 37a and the second wall 37b are both inclined to form an inclined surface. It is only necessary to satisfy _H1 > _H2 .

In some embodiments, referring to Figures 1 to 5, 12 to 15 and 19, the explosion-proof valve 100 also 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 a first direction X. Referring to Figures 11 and 18, a plug hole 14 is provided on the valve body 10, and the plug hole 14 passes through the valve body 10 along the first direction X. The rod body 40 is inserted into the plug hole 14. Specifically, the first connecting end 41 of the rod body 40 is inserted into the plug hole 14, and the cover body 20 is connected to the first connecting end 41. The rod body 40 can reciprocate along the first direction X, thereby driving the cover body 20 to reciprocate along the first direction X, thereby realizing the opening or blocking of the exhaust channel 13.

In some embodiments, referring to Figures 2, 11 to 12 and 18, the number of the socket 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 socket 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 socket 14, the sounding parts 30 and the exhaust channels 13 are arranged at intervals.

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, and 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, so as to realize the assembly between the explosion-proof valve 100 and the battery pack and improve the assembly convenience.

In some embodiments, referring to FIGS. 3 to 4 and 14 to 15 , the cover 20 is threadedly connected to the first connecting end 41 of the rod 40 , so as to realize the detachable assembly of the cover 20 and the rod 40 and improve the convenience of maintenance.

In some embodiments, referring to Figures 2, 12, 14 and 19, the explosion-proof valve 100 also 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, and 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.

The gas generated by the battery cells in the battery pack during the cycle operation forms an airflow in the battery pack. The airflow pushes the second connection end 42 of the rod body 40 along the first direction X, and applies 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 the air pressure of the airflow exceeds the opening threshold of the explosion-proof valve 100 to form a thermal runaway airflow, the thrust generated causes the first connection end 41 of the rod body 40 to extend out of the exhaust channel 13 along the first direction X. The rod body 40 squeezes the elastic member 50 during the movement, causing the elastic member 50 to produce elastic deformation. Moreover, 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 pressure relief and exhaust actions. 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 body 40 cannot push the rod body 40, and the rod body 40 retracts the first connection end 41 of the rod body 40 into the exhaust passage 13 along the first direction X under the elastic deformation of the elastic member 50, and the explosion-proof valve 100 returns to the closed state. Therefore, the automatic opening and closing of the explosion-proof valve 100 is realized through the design of the elastic member 50, and the degree of automation is improved.

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

In some embodiments, referring to Figure 19, the second connecting end 42 of the rod body 40 is provided with a protrusion 421, and the protrusion 421 is protruding along the circumferential direction of the second connecting end 42 and is arranged 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 connection stability 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.

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.

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 a battery cell. 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.

The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the methods and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims (11)

1. An explosion-proof valve, the explosion-proof valve having a first direction, characterized in that 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 is partially blocked to form a barrier to the airflow entering the chamber. 2. The explosion-proof valve according to claim 1, characterized in that 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, characterized in that the sound-generating portion includes a blocking portion, and the blocking portion can block part of the air inlet to form a barrier to the airflow inside the chamber. 4. The explosion-proof valve according to claim 1, characterized in that the sound-generating portion is provided on the second surface, and the sound-generating portion extends along the first direction; The chamber is in communication with the exhaust channel through the diverter 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, characterized in that the explosion-proof valve further comprises a blocking member, wherein the blocking member is arranged on the second surface, and the blocking member 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, characterized in that the sound-generating part further comprises a blocking part, the blocking part is internally connected to the air inlet, and the blocking part can block a part of the air inlet to form a barrier to the airflow inside the chamber. 7. The explosion-proof valve according to claim 1, characterized in that, along the thickness direction of the first side wall, the diversion port comprises 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) H ₁ ＜H ₂ ; (b) H ₁ >H ₂ ; (c) H ₁ =H ₂ . 8. The explosion-proof valve according to claim 7, characterized in that the diversion port comprises a first wall and a second wall arranged opposite to each other along the first direction, and at least one of the first wall 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) H ₁ ＜H ₂ ; (b) H ₁ >H ₂ . 9. The explosion-proof valve according to claim 1, characterized in that the explosion-proof valve comprises a rod body, a plug hole is provided 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. 10. The explosion-proof valve according to claim 9, characterized in that the explosion-proof valve further comprises an elastic member, and 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. 11. A battery pack, comprising: A box body, wherein a receiving cavity is disposed in the box body, and a pressure relief hole communicating with the receiving cavity is opened on the box body; and The explosion-proof valve according to any one of claims 1 to 10, wherein the explosion-proof valve cover is engaged with the pressure relief hole.