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

Explosion-proof valve and battery pack Download PDF

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Publication number
CN118099654A
CN118099654A CN202410053940.0A CN202410053940A CN118099654A CN 118099654 A CN118099654 A CN 118099654A CN 202410053940 A CN202410053940 A CN 202410053940A CN 118099654 A CN118099654 A CN 118099654A
Authority
CN
China
Prior art keywords
explosion
proof valve
cavity
valve
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410053940.0A
Other languages
Chinese (zh)
Inventor
何振吉
郭立立
程志刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinwangda Power Technology Co ltd
Original Assignee
Xinwangda Power Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xinwangda Power Technology Co ltd filed Critical Xinwangda Power Technology Co ltd
Priority to CN202410053940.0A priority Critical patent/CN118099654A/en
Publication of CN118099654A publication Critical patent/CN118099654A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/394—Gas-pervious parts or elements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/06—Audible signalling systems; Audible personal calling systems using hydraulic transmission; using pneumatic transmission
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/50—Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature
    • H01M6/5044—Cells or batteries structurally combined with cell condition indicating means
    • H01M6/505—Cells combined with indicating means for external visualization of the condition, e.g. by change of colour or of light intensity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The application discloses an explosion-proof valve and a battery pack, wherein an exhaust channel is formed in the valve body along a first direction through the arrangement of the valve body and a cover body, the cover body can open or block the exhaust channel, a sound generating part is arranged on the valve body, a cavity is formed in the sound generating part, a first end is connected and blocked, a gas inlet is formed at the second end, a shunt opening is formed on the first side wall, the gas inlet is blocked, when the battery pack is in thermal runaway, one part of gas flow formed by thermal runaway gas can be discharged through the exhaust channel, the other part of gas flow enters the cavity of the sound generating part through the gas inlet and flows back after reaching the first end, the back flow is blocked and reflected by the blocking at the gas inlet, so that the back flow is reciprocated, the gas flow in the cavity forms a gas flow vortex, and one part of the gas flow in the cavity can be discharged to the outer side of the cavity through the shunt opening, so that new thermal runaway gas can continuously enter the cavity, the gas in the cavity vibrates and continuously generates sound, and the aim of thermal runaway alarming is achieved, and the occurrence of safety risk is avoided.

Description

Explosion-proof valve and battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to an explosion-proof valve and a battery pack.
Background
When the battery pack is in thermal runaway, the explosion-proof valve can be opened under the action of air flow generated by the thermal runaway so as to discharge the air generated by the thermal runaway, and although the discharged air can be observed with naked eyes, the air is difficult to observe at positions with poor visual field or difficult to observe, and the sound of the conventional explosion-proof valve for discharging the thermal runaway air is small, so that the thermal runaway of the battery pack is difficult to be found in time, and the safety risk exists.
Disclosure of Invention
The invention aims to provide an explosion-proof valve and a battery pack, which are used for solving the problem that the safety risk is difficult to find in time when the explosion-proof valve in the battery pack discharges thermal runaway gas at present because the sound is small.
A first aspect of an embodiment of the present application provides an explosion-proof valve having a first direction, the explosion-proof valve comprising: the valve body is provided with a first surface and a second surface which are oppositely arranged along the first direction, and an exhaust channel is arranged in the valve body and penetrates through the valve body along the first direction; the cover body is covered on the first surface and can move along the first direction so as to open or close the exhaust channel; the sound generating part is arranged on the second surface, the sound generating part comprises a first end and a second end which are oppositely arranged along the first direction, a cavity is arranged in the sound generating part, the second surface is connected with and seals the first end, an air inlet communicated with the cavity is formed in the second end so that air flow enters the cavity, the sound generating part is provided with a second direction intersected with the first direction, the sound generating part comprises a first side wall and a second side wall which are oppositely arranged along the second direction, and a shunt opening communicated with the cavity is formed in the first side wall so as to discharge part of air flow in the cavity; wherein the air inlet portion is blocked to form a barrier to air flow into the chamber.
Optionally, the second surface is provided with a containing groove, and the sounding part is inserted into the containing groove; in the first direction, the first end is inserted into the accommodating groove, the second end is positioned at one side of the second surface, which is away from the first surface, and the shunt opening is positioned at one side of the first side wall, which is close to the second end.
Optionally, the sound generating part comprises a blocking part, and the blocking part can block part of the air inlet to form a blocking part for air flow inside the cavity.
Optionally, the sound generating part is arranged on the second surface, and the sound generating part extends along the first direction; the chamber is communicated with the exhaust passage through the shunt opening so as to discharge part of airflow in the chamber to the exhaust passage.
Optionally, the explosion-proof valve further includes a blocking member disposed on the second face, the blocking member being capable of blocking a portion of the air inlet to form a barrier to air flow into the chamber inside.
Optionally, the sounding part further includes a blocking part, the blocking part is inscribed in the air inlet, and the blocking part can block part of the air inlet so as to form a blocking for the air flow inside the chamber.
Optionally, the split port includes a first port and a second port that are oppositely disposed along a thickness direction of the first sidewall; the first port comprises two first end walls which are oppositely arranged along the first direction, the distance between the two first end walls in the first direction is H 1 mm, the second port comprises two second end walls which are oppositely arranged along the first direction, and the relation between the distance between the two second end walls in the first direction is H 2 mm,H1 and H 2 can meet any one of the following three conditions:
(a)H1＜H2；
(b)H1＞H2；
(c)H1＝H2。
Optionally, the shunt opening includes a first wall and a second wall disposed opposite to each other along the first direction, and at least one of the first wall and the second wall is disposed obliquely to form an inclined plane, so that the relationship between H 1 and H 2 satisfies either of the following two conditions:
(a)H1＜H2；
(b)H1＞H2。
optionally, the explosion-proof valve includes a rod body, a jack is formed on the valve body, the jack penetrates through the valve body along the first direction, the rod body is inserted into the jack, the rod body includes a first connection end and a second connection end which are oppositely arranged along the first direction, and the cover body is connected with the first connection end; the lever body is capable of reciprocating in the first direction.
Optionally, the explosion-proof valve further includes an elastic member, and in the first direction, the second connection end is located at a side of the second face away from the first face; the elastic piece is sleeved on the rod body, one end of the elastic piece in the first direction abuts against the second connecting end, and the other end of the elastic piece in the first direction abuts against the second face.
A second aspect of an embodiment of the present application provides a battery pack including: the box body is internally provided with a containing cavity, and a pressure relief hole communicated with the containing cavity is formed in the box body; and the explosion-proof valve according to the first aspect, wherein the explosion-proof valve cover is engaged with the pressure relief hole.
In summary, the embodiment of the application provides an explosion-proof valve and a battery pack with the same, the explosion-proof valve is provided with a valve body and a cover body, an exhaust channel is arranged in the valve body along a first direction, the cover body can move along the first direction to open or block the exhaust channel, when the exhaust channel is opened, thermal runaway gas can be discharged when the battery pack is in thermal runaway, the valve body is provided with a sound generating part, a cavity is arranged in the sound generating part, a first end of the sound generating part is blocked, a second end of the sound generating part is provided with an air inlet, a first side wall of the sound generating part is provided with a shunt opening, and part of air inlet is blocked, so that when the battery pack is in thermal runaway, a part of air flow formed by the thermal runaway gas can be discharged through the exhaust channel to ensure the use safety of the battery pack, and the other part of the air flow formed by the thermal runaway gas can flow back into the cavity of the sound generating part after reaching the first end, the back air inlet is blocked and reflected by the blocking of the air inlet, so that the air flow in the cavity forms the air flow, and part of the air flow in the cavity can be discharged to the outside through the cavity to the shunt opening, thus the thermal runaway gas can continuously enter the cavity, the thermal runaway cavity can be kept out, the thermal runaway can be in time, and the danger can be avoided, and the danger can be kept, and the danger can be evacuated, and the passengers can be more in time and the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a first angle of a first configuration of an explosion proof valve according to an embodiment of the present application;
FIG. 2 is a schematic view of a first configuration of an explosion-proof valve according to an embodiment of the present application;
FIG. 3 is a schematic view of a third angle of a first configuration of an explosion proof valve according to an embodiment of the present application;
FIG. 4 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 5 is a schematic view showing the direction of air flow in a first configuration of an explosion-proof valve according to an embodiment of the present application;
FIG. 6 is a schematic view of a first structure of an acoustic portion in a first structure of an explosion-proof valve according to an embodiment of the present application;
FIG. 7 is a B-B cross-sectional view of FIG. 6;
FIG. 8 is a schematic view of the airflow patterns of the sound emitting portion shown in FIG. 6;
FIG. 9 is a schematic view showing a second structure of an acoustic portion in a first structure of an explosion-proof valve according to an embodiment of the present application;
fig. 10 is a schematic view of a third structure of a sound generating part in the first structure of the explosion-proof valve according to the embodiment of the present application;
FIG. 11 is a schematic view of a valve body in a first configuration of an explosion-proof valve according to an embodiment of the present application;
FIG. 12 is a schematic view of a first angle of a second configuration of an explosion proof valve according to an embodiment of the present application;
FIG. 13 is a schematic view of a second angle of a second configuration of an explosion proof valve according to an embodiment of the present application;
FIG. 14 is a C-C cross-sectional view of FIG. 12;
FIG. 15 is a schematic view of the flow direction of the second configuration of the explosion proof valve according to the embodiment of the present application;
FIG. 16 is an enlarged schematic view of the structure of FIG. 15 at D;
FIG. 17 is a schematic view of a sound generating portion with a blocking portion in a second configuration of an explosion-proof valve according to an embodiment of the present application;
FIG. 18 is a schematic view of a valve body in a second configuration of an explosion protection valve according to an embodiment of the present application;
FIG. 19 is a schematic view showing a combination structure of a rod body, an elastic member and a cover body in an explosion-proof valve according to an embodiment of the present application;
fig. 20 is a schematic structural view of a battery pack according to an embodiment of the present application.
The main reference numerals illustrate:
100. An explosion-proof valve;
10. The valve comprises a valve body, 11, a first surface, 12, a second surface, 121, a containing groove, 13, an exhaust channel, 14, an inserting hole, 15, a mounting hole, 16 and a ring groove;
20. A cover body;
30. a sound emitting portion 31, a first end 32, a second end 33, a chamber 34, an air inlet 35, a first side wall 36, a second side wall 37, a shunt opening 371, a first port 3711, a first end wall 372, a second port 3721, a second end wall 37a, a first wall 37b, a second wall 38, a blocking portion 39, a blocking member;
40. the rod body, 41, the first connecting end, 42, the second connecting end, 421 and the protruding part;
50. an elastic member;
60. A seal ring;
200. battery pack 210, box 211, pressure release hole;
X, first direction, Y, second direction.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the application, and not to limit the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in 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 configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "plurality" means two or more, unless specifically defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
In the examples of the present application, "parallel" refers to a state in which the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is-1 ° to 1 °. The term "perpendicular" refers to a state in which the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The equal distance or angle refers to the state that the tolerance range is-1%.
In some embodiments, an explosion proof valve 100 is provided, referring to fig. 1-11, the explosion proof valve 100 includes: a valve body 10, a cover 20 and a sound generating part 30. Referring to fig. 1, 3 and 4, the explosion proof valve 100 has a first direction X.
In some embodiments, referring to fig. 1 to 5 and 11, the valve body 10 has a first face 11 and a second face 12 disposed opposite to each other along a first direction X, and an exhaust passage 13 is provided in the valve body 10, the exhaust passage 13 penetrates the valve body 10 along the first direction X, the exhaust passage 13 is used for exhausting thermal runaway gas when thermal runaway occurs in the battery pack, wherein the number of the exhaust passages 13 is at least one, in particular, in the embodiment shown in fig. 2 and 5, the valve body 10 is in the shape of a disc, the number of the exhaust passages 13 in the valve body 10 is four, and the four exhaust passages 13 are arranged at intervals along the circumferential direction of the valve body 10.
In some embodiments, referring to fig. 1-5, a cover 20 is provided on the first surface 11 of the valve body 10, and the cover 20 is capable of moving in a first direction X to open or close the exhaust passage 13 in the valve body 10. In the embodiment shown in fig. 1 to 5, in particular, in the embodiment, the gas generated by the battery cell in the battery pack in the recycling process is in a thermal runaway state, the cover 20 is pushed by the air pressure generated by the air flow formed by the thermal runaway gas to move along the first direction X until a gap exists between the cover 20 and the first surface 11, the cover 20 is not attached to the first surface 11, the explosion-proof valve 100 is in an open state, and referring to fig. 5, one end of the exhaust channel 13, which is close to the first surface 11, is communicated with the outside in the first direction X, so that the thermal runaway gas is discharged through the exhaust channel 13, and the pressure relief and the exhaust actions are performed. On the contrary, the battery monomer in the battery pack generates gas in the normal working process, the air pressure of the air flow formed by the gas is insufficient to push the cover body 20 to separate from the first surface 11, namely, the cover body 20 is kept attached to the first surface 11, the explosion-proof valve 100 is in a closed state, and one end, close to the first surface 11, of the exhaust channel 13 in the first direction X is blocked by the cover body 20, so that pressure relief and exhaust actions are not needed.
In some embodiments, referring to fig. 1 to 8, the shape of the sound generating portion 30 is columnar, the sound generating portion 30 is disposed on the second surface 12 of the valve body 10, the sound generating portion 30 includes a first end 31 and a second end 32 disposed opposite to each other along a first direction X, a cavity 33 is disposed in the sound generating portion 30, the first end 31 of the sound generating portion 30 is plugged, specifically, the first end 31 is plugged by the second surface 12 of the valve body 10, the second end 32 of the sound generating portion 30 is provided with an air inlet 34 in communication with the cavity 33, the air inlet 34 is used for allowing an air flow formed by a gas generated by a battery cell in the battery pack during a cycle operation to enter the cavity 33, the sound generating portion 30 has a second direction Y intersecting the first direction X, the sound generating portion 30 includes a first side wall 35 and a second side wall 36 disposed opposite to the first direction Y, a shunt 37 is disposed on the first side wall 35 and is connected to the cavity 33, the shunt 37 is used for discharging a part of the air flow entering the cavity 33 from the air inlet 34, specifically, as shown in the embodiment in fig. 6 to 8, the first direction X is orthogonal to the second direction Y, and the first side wall 37 is disposed on the first side wall 35 near the first side wall 34. Wherein the air inlet 34 is partially blocked to form a barrier to the flow of air into the chamber 33.
The battery monomer in the battery package can slowly produce gas in the circulation working process, the gas that produces forms the air current in the inside of battery package, the air current produces atmospheric pressure, when the atmospheric pressure in the battery package accumulated to a certain extent, when reaching the threshold value of opening of explosion-proof valve, explosion-proof valve can open the gaseous gas that discharges battery monomer production and carry out the exhaust, the pressure release action, and when the battery monomer appears thermal runaway, for example, the short circuit appears in between the battery monomer or the inside of battery monomer, lead to the battery monomer to release a large amount of gaseous thermal runaway in the short time, the atmospheric pressure that the air current that thermal runaway gas formed is too big, the explosion-proof valve can't all discharge thermal runaway gas in the short time leads to dangerous emergence, then need the battery package to send alarm signal, in order to remind personnel to withdraw in time.
For thermal runaway warning of battery package, current battery package passes through various sensors in BMS (battery management system) receiving battery package, and for example temperature sensor, gas sensor, pressure sensor, voltage sensor carry out the multidimensional detection to battery package inside, when signal is unusual, send alarm signal through BMS, but the sensing accuracy and the reliability requirement to the sensor are higher, and there is the possible misinformation risk to lead to the misjudgement. In addition, although the gas exhausted by the explosion-proof valve can be observed by naked eyes, the gas is difficult to observe in some places with poor visual field or difficult to observe, and the sound of the gas exhausted by the traditional explosion-proof valve is small, so that the thermal runaway of the battery pack is difficult to be found in time, and the safety risk exists.
In contrast, in the explosion-proof valve 100 provided in the embodiment of the present application, by providing the exhaust passage 13 in the valve body 10, covering the first surface 11 of the valve body 10 with the cover 20, the cover 20 can open the exhaust passage 13 to exhaust the thermal runaway gas when the thermal runaway occurs in the battery pack, and providing the sound generating portion 30 in the second surface 12 of the valve body 10, providing the chamber 33 in the sound generating portion 30, the first end 31 of the sound generating portion 30 being blocked, the second end 32 being provided with the air inlet 34 communicating with the chamber 33, and providing the shunt opening 37 in the first side wall 35 of the sound generating portion 30, when the thermal runaway occurs in the battery cell in the battery pack, referring to fig. 5 and 8, a part of the airflow formed by the thermal runaway gas is exhausted from the explosion-proof valve 100 through the exhaust passage 13, 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, because the first end 31 is blocked by the second face 12 of the valve body 10, the airflow flowing to the first end 31 is turned back and flows back along the first direction X toward the direction close to the second end 32, and because the second end 32 is partially blocked, a part of the airflow turned back and flowing back to the second end 32 is blocked and flows back toward the first end 31, and thus reciprocates, airflow vortex is formed in the chamber 33, so that the sounding part 30 can sound to achieve the effect of alarming the thermal runaway, and the shunt port 37 can discharge a part of the airflow entering the chamber 33 to the outside of the sounding part 30, the air inlet 34 can supplement fresh thermal runaway gas into the chamber 33, airflow vortex is continuously formed in the chamber 33, so that the sounding part 30 can continuously sound when the battery pack generates the thermal runaway, alarm sound is continuously emitted, and the air pressure of the airflow formed by the thermal runaway gas is increased, the greater the alarm sound, the more accurate and reliable the alarm is ensured, and false alarm is avoided.
In some embodiments, referring to fig. 2,5 and 11, the second face 12 of the valve body 10 is provided with a receiving groove 121, the first end 31 of the sound generating part 30 is inserted into the receiving groove 121 to be plugged, the second end 32 of the sound generating part 30 is located at a side of the second face 12 away from the first face 11 in the first direction X, the shunt opening 37 is located at a side of the first sidewall 35 close to the second end 32, in other words, both the second end 32 and the shunt opening 37 of the sound generating part 30 are exposed at the second face 12. The accommodating groove 121 is formed, so that the stability of the installation of the sound generating part 30 on the second surface 12 can be ensured, the falling off of the sound generating part 30 due to the impact of the thermal runaway gas is avoided, the second end 32 and the shunt opening 37 of the sound generating part 30 are exposed out of the second surface 12, the air flow formed by the thermal runaway gas can be ensured to continuously enter the cavity 33 and the discharge cavity 33, and the sound generating part 30 is ensured to continuously generate an alarm sound.
In some embodiments, referring to fig. 1-2 and 4-10, the sounding portion 30 includes a blocking portion 38, where the blocking portion 38 is disposed in the cavity 33, specifically, the blocking portion 38 is disposed at an end of the inner side of the cavity 33 near the second end 32 in the first direction X, and the blocking portion 38 can block a portion of the air inlet 34 to form a barrier to the air flow entering the inner side of the cavity 33, so that the air flow inside the cavity 33 can repeatedly flow between the blocking portion 38 and the blocked first end 31 to form an air flow vortex, and further, the sounding portion 30 can continuously sound an alarm.
In some embodiments, referring to fig. 11 to 18, the sound emitting part 30 is opened at the second face 12 of the valve body 10 such that the sound emitting part 30 exists as a part of the valve body 10, specifically, a groove is opened at the second face 12 of the valve body 10 to form the sound emitting part 30, a cavity 33 of the groove forms the sound emitting part 30, two opposite side walls of the groove in the second direction Y form a first side wall 35 and a second side wall 36 of the sound emitting part 30, an opening end of the groove forms a second end 32 of the sound emitting part 30, a notch of the groove forms an air inlet 34 of the sound emitting part 30, an inner bottom wall of the groove forms a first end 31 of the sound emitting part 30, the sound emitting part 30 extends in the first direction X, and the cavity 33 of the sound emitting part 30 communicates with the exhaust passage 13 through the split-flow port 37 to discharge part of the air flow entering the cavity 33 to the exhaust passage 13 through the split-flow port 37, and then the exhaust passage 13 to be discharged out of the explosion-proof valve 100 through the exhaust passage 13. By the structural design that the second surface 12 of the valve body 10 is provided with the grooves to form the sound generating part 30, the space occupied by the explosion-proof valve 100 in the first direction X can be saved while the sound generating part 30 continuously generates alarm sounds, and the space utilization rate can be improved.
In some embodiments, the explosion-proof valve 100 further includes a blocking member 39, the blocking member 39 is capable of blocking a portion of the air inlet 34 to form a barrier to the air flow entering the inside of the chamber 33 via the air inlet 34, referring to fig. 12, 14 and 16, the blocking member 39 is a sealing ring, the blocking member 39 is disposed on the second face 12 of the valve body 10 along the circumferential direction of the valve body 10, 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 blocking member 39 simultaneously forms a partial blocking of the air inlet 34 of the four sounding parts 30 in the form of a sealing ring, thereby forming a barrier to the air flow entering the inside of the chamber 33 via the air inlet 34, and the blocking member 39 in the form of a sealing ring can also ensure tightness between the explosion-proof valve 100 and the battery pack to ensure that the thermal runaway air can only be discharged from the exhaust passage 13.
In some embodiments, referring to fig. 17, sound emitting portion 30 further includes a blocking portion 38, blocking portion 38 inscribed within air inlet 34, blocking portion 38 capable of blocking a portion of air inlet 34 to form a barrier to air flow into the interior of chamber 33 via air inlet 34. Specifically, the blocking portion 38 is disposed at an end of the inner side of the chamber 33 near the air inlet 34 in the first direction X, the blocking portion 38 is inscribed in the air inlet 34, the sound generating portion 30 is disposed on the second surface 12 of the valve body 10 in a groove form, and the blocking portion 38 is disposed on the inner side of the chamber 33, so that the space in the chamber 33 can be effectively utilized, the space occupation rate of the valve body 10 in the first direction X is reduced, and the convenience in assembling the explosion-proof valve 100 and the battery pack is improved.
In some embodiments, in the thickness direction of the first side wall 35, that is, in the second direction Y of the sound emitting part 30, the shunt port 37 includes a first port 371 and a second port 372 that are disposed opposite to each other, the first port 371 includes two first end walls 3711 disposed opposite to each other in the first direction X, the second port 372 includes two second end walls 3721 disposed opposite to each other in the first direction X, the distance between the two first end walls 3711 in the first direction X is H 1 mm, the distance between the two second end walls 3721 in the first direction X is H 2 mm, and the relationship between H 1 and H 2 with reference to fig. 7 and 17 is as follows: h 1＜H2, namely, the opening area of the first port 371 is smaller than the opening area of the second port 372, so that when the air flow in the cavity 33 is discharged out of the sounding part 30 through the split-flow port 37, jet flow can be formed at the split-flow port 37 to accelerate the discharge speed of the air flow in the cavity 33, further increase the circulation speed of the air flow in the cavity 33 and improve the alarm volume of the sounding part 30 when the battery pack is out of control.
In some embodiments, the relationship with H 2 with reference to fig. 9,H 1 satisfies: h 1＝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 uniformly discharged to the outside of the sounding part 30 through the shunt port 37, thereby ensuring the continuity of the air flow circulation in the chamber 33 and further ensuring the continuity of the sounding part 30 sounding an alarm.
In some embodiments, referring to fig. 10, the relationship of H 1 to 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 air flow in the chamber 33 is discharged to the second port 372, the air flow is contracted at the second port 372, thereby increasing the exhaust pressure of the air flow discharged from the shunt port 37, and improving the volume of the alarm sound emitted from the sound emitting part 30 while ensuring the sustainability of the air flow circulation in the chamber 33.
In some embodiments, the shunt opening 37 includes a first wall 37a and a second wall 37b disposed opposite to each other along the first direction X, and referring to fig. 6, 7, and 17, the first wall 37a is disposed obliquely to form an inclined plane, the second wall 37b is a plane, and the cross-sectional shape of the shunt opening 37 is a right trapezoid, so that the relationship between H 1 and H 2 satisfies: h 1＜H2, when the sounding part 30 is processed, the inclined surface design of the first wall 37a can be formed only by obliquely cutting the position of the split orifice 37, so that the opening area of the first port 371 is smaller than the opening area of the second port 372, the air flow discharge speed in the cavity 33 is accelerated, the processing mode is simple and convenient, and the sounding part 30 has low manufacturing cost. In other implementations of the application, the first wall 37a is planar and the second wall 37b is angled to form a bevel. In other implementations of the application, both the first wall 37a and the second wall 37b are obliquely disposed to form an incline. Only H 1＜H2 needs to be satisfied.
In some embodiments, referring to fig. 10, the first wall 37a is sloped and the second wall 37b is planar, and the shunt opening 37 has a right trapezoid cross-sectional shape, such that the relationship between H 1 and H 2 is: h 1＞H2, when the sounding portion 30 is processed, only the inclined cutting needs to be performed at the split port 37, so that the inclined surface design of the first wall 37a can be formed, and therefore, when the opening area of the first port 371 is larger than that of the second port 372, and the airflow in the chamber 33 is discharged to the second port 372, the second port 372 is limited, so that the exhaust pressure of the airflow discharged from the split port 37 is increased, the persistence of the airflow circulation in the chamber 33 is ensured, and the volume of the alarm sound emitted by the sounding portion 30 is increased. In other implementations of the application, the first wall 37a is planar and the second wall 37b is angled to form a bevel. In other implementations of the application, both the first wall 37a and the second wall 37b are obliquely disposed to form an incline. Only H 1＞H2 needs to be satisfied.
In some embodiments, referring to fig. 1 to 5, 12 to 15 and 19, the explosion-proof valve 100 further includes a rod body 40, referring to fig. 14 and 19, the rod body 40 includes a first connection end 41 and a second connection end 42 that are disposed opposite to each other along a first direction X, referring to fig. 11 and 18, a jack 14 is formed in the valve body 10, the jack 14 penetrates the valve body 10 along the first direction X, the rod body 40 is inserted into the jack 14, specifically, the first connection end 41 of the rod body 40 is inserted into the jack 14, the cover body 20 is connected to the first connection end 41, and the rod body 40 can reciprocate along the first direction X, so as to drive the cover body 20 to reciprocate along the first direction X, so as to open or close the exhaust channel 13.
In some embodiments, referring to fig. 2, 11-12 and 18, the number of the insertion holes 14 on the valve body 10 is one, the number of the exhaust passages 13 is four, the four exhaust passages 13 are arranged at intervals along the circumferential direction of the valve body 10, the four exhaust passages 13 surround the insertion holes 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 passages 13, and the sounding parts 30 are arranged at intervals with the exhaust passages 13 along the radial direction of the insertion holes 14.
In some embodiments, referring to fig. 11 and 18, the second surface 12 of the valve body 10 is provided with mounting holes 15, specifically, as in the embodiment shown in fig. 11 and 18, the number of the mounting holes 15 is four, the mounting holes are arranged at intervals along the circumferential direction of the valve body 10, one mounting hole 15 is provided between two adjacent exhaust passages 13 along the circumferential direction of the valve body 10, wherein the mounting holes 15 are threaded holes, and the mounting holes are connected with a battery pack through bolts, so that the assembly between the explosion-proof valve 100 and the battery pack is realized, and the convenience of assembly is improved.
In some embodiments, referring to fig. 3-4 and fig. 14-15, the cover 20 is screwed with the first connecting end 41 of the rod 40, so as to realize detachable assembly of the cover 20 and the rod 40, and improve the convenience of maintenance.
In some embodiments, referring to fig. 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 a side of the second surface 12 of the valve body 10 facing 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 abuts against the second connecting end 42, and the other end of the elastic member 50 in the first direction X abuts against the second surface 12 of the valve body 10.
The gas generated by the battery monomer in the battery pack in the circulating working process forms gas flow in the battery pack, the gas flow pushes against the second connecting end 42 of the rod body 40 along the first direction X, a thrust force along the first direction X is applied to the rod body 40, when the gas pressure of the gas flow reaches the opening threshold value of the explosion-proof valve 100, even when the gas pressure of the gas flow exceeds the opening threshold value of the explosion-proof valve 100 to form thermal runaway gas flow, the generated thrust force enables the first connecting end 41 of the rod body 40 to extend out of the gas exhaust channel 13 along the first direction X, the rod body 40 presses the elastic piece 50 in the moving process so that the elastic piece 50 generates elastic deformation, and the movement of the rod body 40 drives the cover body 20 to move along to open the gas exhaust channel of the valve body 10, and the explosion-proof valve 100 performs pressure relief and gas exhaust actions. When the air flow is discharged to the air pressure lower than the opening threshold of the explosion-proof valve 100 through the air discharge channel 13, the pushing force of the air flow to the rod body 40 cannot push the rod body 40, and the rod body 40 makes the first connecting end 41 of the rod body 40 retract into the air discharge channel 13 along the first direction X under the elastic deformation of the elastic member 50, so that the explosion-proof valve 100 is restored to the closed state. Thus, the automatic opening and closing of the explosion-proof valve 100 is realized by the design of the elastic member 50, and the degree of automation is improved.
In some embodiments, the resilient member 50 is a spring.
In some embodiments, referring to fig. 19, the second connecting end 42 of the rod 40 is provided with a protruding portion 421, the protruding portion 421 is protruding from an outer wall of the second connecting end 42 along a circumferential direction of the second connecting end 42, one end of the elastic member 50 away from the second surface 12 in the first direction X abuts against the protruding portion 421, and the protruding portion 421 is designed to ensure connection stability between the elastic member 50 and the second connecting end 42, so as to ensure that the rod 40 stretches out or contracts smoothly along the first direction X.
In some embodiments, referring to fig. 11 and 18, the explosion-proof valve 100 further includes a sealing ring 60, the second surface 12 of the valve body 10 is provided with a ring groove 16, the ring groove 16 surrounds the sound generating portion 30 along the circumferential direction of the valve body 10, the sealing ring 60 is embedded in the ring groove 16, and the sealing ring 60 is designed to ensure tightness 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 performs pressure relief operation, air flow can only be discharged from the air discharge channel 13 of the explosion-proof valve 100, and smooth operation of the explosion-proof valve 100 is ensured.
In some embodiments, referring to fig. 20, the battery pack 200 further includes a case 210 and the explosion-proof valve 100 as described above, a receiving cavity (not shown in the figure) is disposed in the case 210, the receiving cavity is used for receiving the battery unit, a pressure release hole 211 communicated with the receiving cavity is formed on a side wall of the case 210, the explosion-proof valve 100 covers the pressure release hole 211, specifically, the second face 12 of the valve body 10 of the explosion-proof valve 100 covers the pressure release hole 211, so as to form a seal for the pressure release hole 211.
The foregoing has outlined the detailed description of the embodiments of the present invention, and the detailed description of the principles and embodiments of the present invention is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.

Claims (11)

1. An explosion protection valve having a first direction, the explosion protection valve comprising:
The valve body is provided with a first surface and a second surface which are oppositely arranged along the first direction, and an exhaust channel is arranged in the valve body and penetrates through the valve body along the first direction;
The cover body is covered on the first surface and can move along the first direction so as to open or close the exhaust channel;
The sound generating part is arranged on the second surface, the sound generating part comprises a first end and a second end which are oppositely arranged along the first direction, a cavity is arranged in the sound generating part, the second surface is connected with and seals the first end, an air inlet communicated with the cavity is formed in the second end so that air flow enters the cavity, the sound generating part is provided with a second direction intersected with the first direction, the sound generating part comprises a first side wall and a second side wall which are oppositely arranged along the second direction, and a shunt opening communicated with the cavity is formed in the first side wall so as to discharge part of air flow in the cavity;
Wherein the air inlet portion is blocked to form a barrier to air flow into the chamber.
2. The explosion-proof valve as set forth in claim 1, wherein said second face is provided with a receiving groove, and said sound-generating portion is inserted into said receiving groove;
In the first direction, the first end is inserted into the accommodating groove, the second end is positioned at one side of the second surface, which is away from the first surface, and the shunt opening is positioned at one side of the first side wall, which is close to the second end.
3. The explosion proof valve of claim 2, wherein said sound emitting portion comprises a blocking portion capable of blocking a portion of said air inlet to form a barrier to air flow inside said chamber.
4. The explosion-proof valve as set forth in claim 1, wherein said sound-emitting portion is provided on said second face, said sound-emitting portion extending in said first direction;
The chamber is communicated with the exhaust passage through the shunt opening so as to discharge part of airflow in the chamber to the exhaust passage.
5. The explosion proof valve of claim 4, further comprising a blocking member disposed on said second face, said blocking member being capable of blocking a portion of said air inlet to form a barrier to air flow into the interior of said chamber.
6. The explosion proof valve of claim 4, wherein said sound emitting portion further comprises a blocking portion inscribed in said air inlet, said blocking portion being capable of blocking a portion of said air inlet to form a barrier to air flow inside said chamber.
7. The explosion-proof valve as set forth in claim 1, wherein said shunt port includes a first port and a second port disposed opposite to each other in a thickness direction of said first side wall;
The first port comprises two first end walls which are oppositely arranged along the first direction, the distance between the two first end walls in the first direction is H 1 mm, the second port comprises two second end walls which are oppositely arranged along the first direction, and the relation between the distance between the two second end walls in the first direction is H 2mm,H1 and H 2 can meet any one of the following three conditions:
(a)H1＜H2；
(b)H1＞H2；
(c)H1＝H2。
8. The explosion-proof valve as set forth in claim 7, wherein said shunt opening comprises a first wall and a second wall disposed opposite in said first direction, at least one of said first wall and said second wall being inclined to form an inclined plane such that the relationship of H 1 to H 2 satisfies either of:
(a)H1＜H2；
(b)H1＞H2。
9. The explosion-proof valve as set forth in claim 1, wherein said explosion-proof valve comprises a rod body, said valve body is provided with a jack, said jack penetrates said valve body in said first direction, said rod body is inserted into said jack, said rod body comprises a first connecting end and a second connecting end which are oppositely arranged in said first direction, and said cover body is connected with said first connecting end;
the lever body is capable of reciprocating in the first direction.
10. The explosion proof valve of claim 9, further comprising an elastic member, said second connecting end being located on a side of said second face facing away from said first face in said first direction;
The elastic piece is sleeved on the rod body, one end of the elastic piece in the first direction abuts against the second connecting end, and the other end of the elastic piece in the first direction abuts against the second face.
11. A battery pack, comprising:
the box body is internally provided with a containing cavity, and a pressure relief hole communicated with the containing cavity is formed in the box body; and
The explosion proof valve according to any one of claims 1 to 10, wherein the explosion proof valve cover is coupled to the pressure relief hole.
CN202410053940.0A 2024-01-12 2024-01-12 Explosion-proof valve and battery pack Pending CN118099654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410053940.0A CN118099654A (en) 2024-01-12 2024-01-12 Explosion-proof valve and battery pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410053940.0A CN118099654A (en) 2024-01-12 2024-01-12 Explosion-proof valve and battery pack

Publications (1)

Publication Number Publication Date
CN118099654A true CN118099654A (en) 2024-05-28

Family

ID=91146951

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410053940.0A Pending CN118099654A (en) 2024-01-12 2024-01-12 Explosion-proof valve and battery pack

Country Status (1)

Country Link
CN (1) CN118099654A (en)

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