CN212209631U - Explosion-proof valve for battery pack - Google Patents

Abstract

The utility model provides a battery package explosion-proof valve, include: a cap and a plurality of pressure relief assemblies. Be formed with a plurality of pressure release holes that link up the top cap along thickness direction on the top cap, the pressure release subassembly is established at the pressure release hole position that corresponds and convertible between explosion-proof pressure release state and atmospheric pressure balanced state, is formed with the inside and outside passageway of taking a breath of intercommunication battery package in the pressure release subassembly, the inside and outside atmosphere of sealed pressure release hole of pressure release subassembly and through the passageway of taking a breath connection battery package when atmospheric pressure balanced state, the pressure release hole is opened to the pressure release subassembly when explosion-proof pressure release state. According to the utility model discloses an explosion-proof valve of battery package, through be formed with a plurality of pressure release holes on the top cap, and have a plurality of pressure release subassemblies with a plurality of pressure release hole one-to-ones. Therefore, the ventilation requirement of the battery pack in normal use is guaranteed, the flow area in pressure relief is increased, and the safety and reliability of the battery pack are improved.

Description

Explosion-proof valve for battery pack

Technical Field

The utility model belongs to the technical field of explosion-proof valve technique and specifically relates to a battery package explosion-proof valve is related to.

Background

The modern automobile industry is revolutionarily changing, namely, the traditional fuel automobile is gradually replaced by a new energy automobile, wherein a pure electric automobile is rising as one of the new energy automobiles, a plurality of transmission fuel automobile platforms directly replace an engine structure with a power battery pack structure, an automobile power source is replaced by a fuel oil battery, and with the decrease of new energy subsidies, the design of a low-cost battery pack becomes the key point of research and development design of each large battery factory, but the safety of the battery pack must be put on the first place on the premise of low cost, and the safety design of the battery pack becomes one of the hot spots of the current new energy research. Aiming at the battery core of the 811 system, the safety of the battery pack is ensured while high energy density is pursued, the gas production rate is high when the high energy density battery core of the 811 system is out of control due to heat, and the pressure in the battery pack is rapidly released while the shell of the battery pack is prevented from causing fire and explosion due to rupture due to out of control due to heat.

In order to pursue the design of lightweight battery pack structure, the casing adopts plastics upper housing on the battery pack more, plastics upper housing carries on 811 the electric core of system, when the battery pack takes place the thermal runaway, because the explosion-proof valve structure of thimble blasting mode because of the distance design limit of thimble and ventilated membrane, can't realize the explosion-proof valve design of low burst pressure (burst pressure is less than or equal to 10kpa), spring explosion-proof valve structure can accomplish the minimum burst pressure but because the spring can't bounce when the thermal runaway, can only realize once opening, can't fully release the pressure in the battery pack, and can't prevent battery pack flame blowout when opening, it is higher to need to install its cost of a plurality of explosion-proof valves in order to increase ventilation volume simultaneously.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a battery package explosion-proof valve, battery package explosion-proof valve structural design is ingenious, and the security performance is good, and the platformization degree is high.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

according to the utility model discloses battery package explosion-proof valve, include: the top cover is in a plate body shape, and a plurality of pressure relief holes penetrating through the top cover along the thickness direction are formed in the top cover; a plurality of pressure release subassembly, it is a plurality of pressure release subassembly and a plurality of pressure release hole one-to-one, the pressure release subassembly is established and is corresponding pressure release hole position and convertible between explosion-proof pressure release state and atmospheric pressure balanced state, be formed with the intercommunication in the pressure release subassembly the inside and outside passageway of taking a breath of battery package, the pressure release subassembly is in seal during the atmospheric pressure balanced state the pressure release hole just passes through the passageway of taking a breath is connected the inside and outside atmosphere of battery package, the pressure release subassembly is in open during explosion-proof pressure release state the pressure release hole.

According to the utility model discloses battery package explosion-proof valve, through be formed with a plurality of pressure release holes on the top cap, and have a plurality of pressure release components with a plurality of pressure release hole one-to-ones, and all be formed with the inside and outside atmospheric passageway of taking a breath of intercommunication battery package in every pressure release component, every pressure release component all can change between explosion-proof pressure release state and atmospheric pressure balanced state. Therefore, the ventilation requirement in the air pressure balance state is ensured, the sufficient ventilation quantity in the explosion-proof pressure relief state is ensured, the production cost is reduced, the safety of the battery pack explosion-proof valve is improved, and the adaptation degree of the battery pack explosion-proof valve to different platforms is expanded.

In some embodiments of the utility model, the pressure relief component includes: the sealing cover is arranged on the outer side of the top cover and used for sealing the pressure relief hole; one end of the spring rod is arranged on the inner side of the top cover, the other end of the spring rod penetrates through the top cover to be fixedly connected with the sealing cover, a flange extending outwards in the radial direction is formed at the one end of the spring rod, and the flange is formed into a ring shape extending along the circumferential direction of the spring rod; the spring is sleeved on the spring rod, one end of the spring is fixedly connected with the flange, and the other end of the spring is fixed to or abutted against the inner side surface of the top cover.

Furthermore, a balance cavity is formed in the sealing cover, an air hole communicated with the outside atmosphere and the balance cavity is formed in the sealing cover, a mounting hole is further formed in the sealing cover, the spring rod is formed into a cylindrical shape with two open axial ends, and the other end of the spring rod penetrates through the mounting hole and extends into the balance cavity.

Further, the sealing cover includes: sealed lower cover and lid are established sealed upper cover on the sealed lower cover, the bleeder vent forms in on the lateral wall or the roof of sealed upper cover, the mounting hole link up the diapire of sealed lower cover, the pressure release subassembly still includes: and the connecting nut is arranged in the balance cavity and is in threaded connection with the other end of the spring rod, which extends into the balance cavity.

Further, the pressure relief assembly further comprises: a breathable film, wherein the breathable film covers the other end of the spring rod.

Furthermore, a plurality of through holes penetrating in the thickness direction are formed in the peripheral wall of the spring rod.

Further, the outside surface of top cap is formed with inside sunken heavy groove, the pressure release hole link up along thickness direction the diapire in heavy groove, pressure release subassembly still includes: the anti-explosion pressure relief device comprises an elastic limiting part which is telescopic along the length direction, one end of the elastic limiting part is connected with the sealing cover, the other end of the elastic limiting part abuts against the peripheral wall of the sinking groove when the air pressure is balanced, and the other end of the elastic limiting part is supported on the peripheral edge of the sinking groove when the anti-explosion pressure relief state is achieved.

Further, in the plurality of pressure relief assemblies, the burst pressure at which at least one of the pressure relief assemblies is converted from the air pressure equilibrium state to the explosion-proof pressure relief state is different from the burst pressure of the other pressure relief assemblies.

Further, in the pressure relief assemblies, the elastic coefficient of at least one of the springs is different from the elastic coefficients of the other springs, and/or the length of at least one of the spring rods is different from the length of the other spring rods.

Further, the top cover includes: the pressure relief hole penetrates through the top cover body along the thickness direction of the top cover body; and a plurality of stainless steel metal nets corresponding to the pressure relief holes one to one, wherein the stainless steel metal nets are connected with the top cover body and are positioned at the corresponding pressure relief holes, and the stainless steel metal nets are integrally formed by injection molding of the top cover body.

Compared with the prior art, battery package explosion-proof valve, have low burst pressure, adapt to the characteristics of different platformizations, realize the explosion-proof valve structure of different blasting back air permeability, this explosion-proof valve is rectangle structure make full use of surface area, realize the biggest air permeability after the blasting, and can design into different burst pressure's split type explosion-proof valve structure according to spring structure, can realize the blasting according to whole package burst pressure and air permeability demand in grades, such structural design has both avoided the battery package to arouse the cracked problem of casing inadequately because of air permeability and has avoided the volume of opening to arouse the fire in too much oxygen gets into the battery package simultaneously, the security performance of battery package has been improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic diagram of an explosion-proof valve for a battery pack according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of an isometric view of the battery pack explosion prevention valve shown in FIG. 1;

FIG. 3 is a schematic diagram of a top view of the explosion prevention valve of the battery pack shown in FIG. 1;

fig. 4 is a schematic view of a cross-sectional view of the explosion-proof valve of the battery pack shown in fig. 3, taken along the line a-a;

FIG. 5 is a schematic view of an assembled view of the explosion vent valve of the battery pack shown in FIG. 1, with one pressure relief assembly assembled;

FIG. 6 is a schematic illustration of an assembled view of the battery pack explosion vent valve shown in FIG. 1, wherein none of the plurality of pressure relief assemblies are assembled;

fig. 7 is a schematic view of a bottom view of a top cover of the explosion vent valve for the battery pack shown in fig. 1;

fig. 8 is a schematic diagram of a top view of the top cover of the explosion vent valve of the battery pack shown in fig. 1;

FIG. 9 is a schematic view of a pressure relief assembly of the battery pack explosion vent valve shown in FIG. 1;

FIG. 10 is a schematic illustration of an exploded view of the pressure relief assembly shown in FIG. 9;

FIG. 11 is a schematic diagram of a top view of the pressure relief assembly shown in FIG. 9.

Description of reference numerals:

battery pack explosion-proof valve 100:

a top cover 1, a pressure relief hole 11, a perforation 111, a sink tank 12, a top cover body 13, a stainless steel metal net 14,

a pressure relief assembly 2, a sealing cover 21, a balance cavity 211, a positioning rib 2111, a sealing upper cover 212, a vent hole 2121, a sealing lower cover 213, a relief hole 214,

the spring rod 22, the flange 221, the through hole 222,

the spring (23) is provided with a spring,

the coupling nut 24 is coupled to the housing,

a gas-permeable membrane 25 which,

an elastic limiting member 26 is provided on the upper surface of the frame,

the first sealing strip 27 is provided with a first sealing strip,

the second sealing strip 28 is provided with a second sealing strip,

a ventilation channel 29.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to 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", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

A battery pack explosion-proof valve 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 11.

For example, as shown in fig. 1, a battery pack explosion-proof valve 100 according to an embodiment of the present invention includes: a cap 1 and a plurality of pressure relief assemblies 2.

Specifically, the top cover 1 is a plate body, and a plurality of pressure release holes 11 penetrating the top cover 1 in the thickness direction are formed in the top cover 1. The pressure relief holes 11 are used to release the pressure inside the top cover 1, whereby the plurality of pressure relief holes 11 can accelerate the speed of releasing the pressure.

A plurality of pressure release components 2 and a plurality of pressure release hole 11 one-to-one, pressure release component 2 establishes the 11 positions in pressure release hole that correspond, and pressure release component 2 is convertible between explosion-proof pressure release state and atmospheric pressure balanced state, be formed with inside and outside passageway of taking a breath of intercommunication battery package 29 in the pressure release component 2, pressure release component 2 seals pressure release hole 11 when atmospheric pressure balanced state, and pressure release component 2 connects the inside and outside atmosphere of battery package through passageway of taking a breath 29 when atmospheric pressure balanced state, pressure release component 2 opens pressure release hole 11 when explosion-proof pressure release state.

That is to say, each pressure relief assembly 2 has a corresponding pressure relief hole 11, the pressure relief assembly 2 is arranged at the position of the corresponding pressure relief hole 11, and the pressure relief assembly 2 is convertible between an explosion-proof pressure relief state and an air pressure balance state. When the air pressure is balanced, the pressure relief assembly 2 is used for sealing the pressure relief hole 11, and the ventilation channel 29 in the pressure relief assembly 2 is used for communicating the inside and outside atmosphere of the battery pack; in the explosion-proof pressure relief state, the pressure relief assembly 2 is used for opening the pressure relief hole 11. From this, the design benefit of a plurality of pressure release subassembly 2 and a plurality of pressure release hole 11, the passageway 29 of taking a breath in the pressure release subassembly 2 is rational in infrastructure, when having guaranteed the needs of taking a breath when atmospheric pressure balanced state, abundant ventilative volume when having guaranteed explosion-proof pressure release state again has reduced manufacturing cost, has improved the security of battery package explosion-proof valve 100.

According to the battery pack explosion-proof valve 100 provided by the embodiment of the utility model, the top cover 1 is provided with the plurality of pressure relief holes 11, the plurality of pressure relief assemblies 2 are in one-to-one correspondence with the plurality of pressure relief holes 11, the ventilation channel 29 is formed in each pressure relief assembly 2, the ventilation channel 29 can be communicated with the atmosphere inside and outside the battery pack, the pressure relief assemblies 2 are used for sealing the pressure relief holes 11 when the air pressure is balanced, and the ventilation channel 29 in the pressure relief assemblies 2 is used for communicating the atmosphere inside and outside the battery pack; in an explosion-proof pressure relief state, the pressure relief assembly 2 is used for opening the pressure relief hole 11, and the airflow in the ventilation channel 29 in the pressure relief assembly 2 is reversed and used for releasing the pressure in the top cover 1 together with the pressure relief hole 11. Therefore, the release speed of the pressure in the battery pack can be increased, the battery pack is prevented from being exploded, and the safety of the battery pack explosion-proof valve 100 is improved.

In short, according to the utility model discloses battery package explosion-proof valve 100, when the needs of taking a breath when having guaranteed atmospheric pressure balanced state, abundant ventilative volume when having guaranteed explosion-proof pressure release state again has reduced manufacturing cost, has improved battery package explosion-proof valve 100's security, has expanded the degree that battery package explosion-proof valve 100 adapts to different platformizations.

In some embodiments of the present invention, the pressure relief assembly 2 comprises: a sealing cover 21, a spring rod 22 and a spring 23. The sealing cover 21 is provided at the outer side of the top cover 1 for sealing the pressure relief hole 11. One end of the spring rod 22 (e.g., the lower end of the spring rod 22 shown in fig. 4) is disposed inside the top cover 1, and the other end of the spring rod 22 (e.g., the upper end of the spring rod 22 shown in fig. 4) passes through the top cover 1 and is fixedly connected with the sealing cover 21. The spring 23 is disposed on the spring rod 22, and one end of the spring 23 (e.g., the lower end of the spring rod 22 shown in fig. 4) is fixed to one end of the spring rod 22 (e.g., the lower end of the spring rod 22 shown in fig. 4), and the other end of the spring 23 (e.g., the upper end of the spring rod 22 shown in fig. 4) is fixed to or abutted against the inner surface of the top cover 1. Therefore, the spring rod 22 and the spring 23 are ingenious in matched design, simple in structure and convenient to assemble, and production cost is reduced.

Further, one end of the spring rod 22 (e.g., the lower end of the spring rod 22 shown in fig. 10) is formed with a flange 221 extending radially outward, the flange 221 is formed in a ring shape extending in the circumferential direction of the spring rod 22, and one end of the spring 23 (e.g., the lower end of the spring rod 22 shown in fig. 10) is connected to the flange 221. That is, the flange 221 is formed at the lower end of the spring rod 22 (for example, the lower end of the spring rod 22 shown in fig. 10), the flange 221 is in the shape of a ring extending in the circumferential direction of the spring rod 22, and the lower end of the spring 23 abuts against the flange 221. The outer diameter of the spring 23 is smaller than the outer diameter of the flange 221 of the lower end of the spring rod 22 (e.g., the lower end of the spring rod 22 shown in fig. 10). From this, simple structure is reasonable, and simple to operate has reduced manufacturing cost, has increased pressure relief subassembly 2's stability and reliability.

Further, as shown in fig. 10, a balance chamber 211 is formed in the sealing cover 21, an air hole 2121 for communicating the outside atmosphere with the balance chamber 211 is formed in the sealing cover 21, a mounting hole (not shown) is formed in the sealing cover 21, the spring rod 22 is formed in a cylindrical shape with both ends open in the axial direction, and the other end of the spring rod 22 (for example, the upper end of the spring rod 22 shown in fig. 10) penetrates through the mounting hole and extends into the balance chamber 211. That is, the sealing cover 21 is formed in the balance cavity 211, the sealing cover 21 is formed with the ventilation holes 2121 and the mounting holes, the ventilation holes 2121 are used for communicating the outside atmosphere with the balance cavity 211, the mounting holes are used for the upper end of the spring rod 22 to penetrate through and extend into the balance cavity 211, the spring rod 22 is formed in a cylindrical shape with both ends open in the axial direction, and thus, the inner side channel of the spring rod 22, the balance cavity 211 and the ventilation holes 2121 together form the ventilation channel 29 of the pressure relief assembly 2 for communicating the atmosphere inside and outside the battery pack. Therefore, the production cost of the battery pack explosion-proof valve 100 is reduced, the gas exchange inside and outside the battery pack is ensured, and the reliability of the pressure relief assembly 2 is improved.

In some embodiments, as shown in fig. 9, the sealing cover 21 includes: a sealing lower cap 213 and a sealing upper cap 212. The upper sealing cover 212 is covered on the lower sealing cover 213, the ventilation holes 2121 are formed on the side wall or the top wall of the upper sealing cover 212, and the mounting holes penetrate through the bottom wall of the lower sealing cover 213. That is, the balance chamber 211 is formed in a space between the sealing upper cap 212 and the sealing upper cap 212, the airing holes 2121 are formed on a side wall of the sealing upper cap 212, or the airing holes 2121 are formed on a top wall of the sealing upper cap 212, the mounting holes are formed on a bottom wall of the sealing lower cap 213, and the mounting holes penetrate the bottom wall of the sealing lower cap 213. Therefore, the sealing cover 21 has a simple overall structure and is convenient to manufacture.

Alternatively, the sealing upper cover 213 and the sealing upper cover 212 are bonded using a structural adhesive. Thus, the sealability of the sealing cover 21 is ensured.

In some embodiments, the pressure relief assembly 2 further comprises: a nut 24 is attached. The coupling nut 24 is disposed in the balance chamber 211, and the coupling nut 24 is threadedly coupled to the other end of the spring rod 22 (e.g., the upper end of the spring rod 22 shown in fig. 10) that extends into the balance chamber 211. Therefore, the threaded connection increases the reliability and stability of the pressure relief assembly 2 and is convenient to assemble.

Optionally, the coupling nut 24 is a metal nut. When the battery pack is subjected to airtight testing, the magnet structure on the airtight tool can be utilized to attract the nut structure inside the airtight tool through the top cover 1, so that the inflation quantity of the airtight tool is increased, the inflation time is shortened, the airtight testing efficiency is improved, and the production beat is improved.

Further, as shown in fig. 11, the pressure relief assembly 2 further includes: a gas permeable membrane 25. The vented membrane 25 covers the other end of the pogo pin 22 (e.g., the upper end of the pogo pin 22 shown in fig. 10). Therefore, when dust is prevented from entering the spring rod 22, the sealing integrity of the pressure relief assembly 2 is protected, and the breathable film 25 is good in high-temperature resistance and long in service life.

In some embodiments, as shown in fig. 4, the spring lever 22 has a peripheral wall formed with a plurality of through holes 222 that penetrate in the wall thickness direction. The plurality of through holes 222 communicate with the ventilation channel 29 for ventilation in the air pressure equilibrium state. From this, a plurality of through-holes 222 have increased the area of taking a breath, have increased the ventilative volume of battery package explosion-proof valve 100 under the non-thermal runaway condition for the speed of taking a breath, and the quantity of through-hole 222 can be designed according to the demand of ventilative volume, and application scope is wide.

Specifically, in the air pressure equilibrium state, the atmosphere outside the battery pack enters the equilibrium cavity 211 through the air holes 2121, then enters the ventilation channel 29 in the spring rod 22 through the ventilation film 25, and finally enters the battery pack through the plurality of through holes 222 on the peripheral wall of the spring rod 22 and the lower end open end of the spring rod 22, so that the air pressure equilibrium in the battery pack is realized.

Referring to fig. 5, an inwardly recessed sink groove 12 is formed on an outer surface of the top cap 1, and a pressure relief hole 11 penetrates through a bottom wall of the sink groove 12 in a thickness direction. Therefore, the top cover 1 is simple in structure and convenient to manufacture.

In some embodiments of the present invention, the pressure relief assembly 2 further comprises: an elastic stopper 26. The elastic limiting member 26 is retractable along the length direction, one end of the elastic limiting member 26 (for example, the right end of the elastic limiting member 26 shown in fig. 5) is connected to the sealing cover 21, the other end of the elastic limiting member 26 (for example, the left end of the elastic limiting member 26 shown in fig. 5) abuts against the peripheral wall of the sinking groove 12 when the pressure relief assembly 2 is in the air pressure balance state, and the other end of the elastic limiting member 26 (for example, the left end of the elastic limiting member 26 shown in fig. 5) is supported on the peripheral edge of the sinking groove 12 when the pressure relief assembly 2 is in the.

That is, in the state of air pressure equilibrium, the elastic limiting member 26 is compressed in the sealing cover 21, at this time, the elastic limiting member 26 generates elastic deformation and has elastic potential energy, and the left end of the elastic limiting member 26 (for example, the left end of the elastic limiting member 26 shown in fig. 5) abuts against the peripheral wall of the sinking groove 12 of the top cover 1; when explosion-proof pressure release state, the pressure in the battery package increases suddenly, and spring 23 is compressed this moment, and spring lever 22 is pushing away seal cap 1 for pressure release subassembly 2 leaves with cap 1, and the gas is discharged rapidly in the battery package, and at this moment, elasticity locating part 26 no longer rebounds, makes and lasts the exhaust in the battery package, has improved the security performance of battery package explosion-proof valve 100.

For example, as shown in fig. 1, an avoiding hole 214 is formed on a peripheral wall of the sealing cover 21, a positioning rib 2111 is disposed in the balance cavity 211, and one end of the elastic limiting member 26 (for example, the right end of the elastic limiting member 26 shown in fig. 10) passes through the avoiding hole 214 and extends into the balance cavity 211 to be fixedly connected with the positioning rib 2111. Therefore, the connection mode of the elastic limiting piece 26 and the sealing cover 21 is simple, the assembly steps are simplified, and the production efficiency is improved.

Specifically, the setting of elasticity locating part 26 can prevent pressure release subassembly 2's resilience, and sufficient volume of losing air when such structural design can guarantee the explosion-proof pressure release state of battery package avoids increasing the entering of oxygen in the outside air again, provides explosion risk for the thermal runaway of electric core in the battery package, has improved the security performance of battery package explosion-proof valve 100.

Optionally, one end of the elastic limiting member 26 (for example, the right end of the elastic limiting member 26 shown in fig. 10) is bonded to the positioning rib 2111 by structural adhesive. Thus, the pressure relief assembly 2 can be stably supported on the peripheral wall of the sinking groove 12 of the top cover 1 in an explosion-proof pressure relief state.

When the air pressure is balanced, the pressure inside the battery pack is lower than the pressure outside the battery pack, and the external air of the battery pack enters the balance cavity 211 through the air holes 2121, then enters the ventilation channel 29 inside the spring rod 22 through the air permeable film 25, and finally enters the battery pack through the through holes 222 on the peripheral wall of the spring rod 22, so that the air pressure inside the battery pack is balanced.

In an explosion-proof pressure relief state, at this time, the pressure inside the battery pack is greater than the pressure outside the battery pack, the pressure relief assembly 2 is separated from the top cover 1, the other end of the elastic limiting member 26 (for example, the left end of the elastic limiting member 26 shown in fig. 10) is supported on the periphery of the sinking groove 12, a part of high-temperature and high-pressure gas inside the battery pack is discharged through the pressure relief holes 11, and the other part of high-temperature and high-pressure gas inside the battery pack enters the ventilation channel 29 inside the spring rod 22 through the through holes 222 on the periphery wall of the spring rod 22, then enters the balance cavity 211 through the ventilation film 25, and finally is discharged through the ventilation holes 2121.

The utility model discloses an in some embodiments, in a plurality of pressure release subassembly 2, the burst pressure that at least one pressure release subassembly 2 converted to explosion-proof pressure release state from atmospheric pressure equilibrium state is different with other pressure release subassembly's burst pressure. That is, among the plurality of pressure relief assemblies 2, the burst pressure of one pressure relief assembly 2 among the plurality of pressure relief assemblies 2 is different from the burst pressure of the other pressure relief assemblies 2, or the burst pressures of several pressure relief assemblies 2 among the plurality of pressure relief assemblies 2 are the same and different from the burst pressure of the other pressure relief assemblies 2. Therefore, the plurality of pressure relief assemblies 2 can be opened at different explosion pressures from 3KPa to 10KPa in sequence, and flame ejection in the battery pack can be avoided when the plurality of pressure relief assemblies 2 are opened simultaneously, so that safety accidents are avoided, and the safety performance of the battery pack explosion-proof valve 100 is improved.

Further, in the plurality of pressure relief assemblies 2, at least one spring 23 of the plurality of springs 23 has a different spring constant than the other springs 23, and/or at least one spring 23 of the plurality of spring 23 rods 22 has a different length than the other spring 23 rods 22. In other words, in the plurality of pressure relief assemblies 2, the spring constant of one spring 23 of the plurality of springs 23 is different from the spring constant of the other springs 23, or the spring constants of several springs 23 of the plurality of springs 23 are the same and different from the spring constant of the other springs 23. The length of one spring bar 22 of the plurality of spring bars 22 is different from the length of the other spring bars 22, or the length of several spring bars 22 of the plurality of spring bars 22 is the same as the length of the other spring bars 22.

Specifically, the elastic coefficient K of the spring 23, the length of the spring rod 22 and the limiting structure determine the maximum pressure required when the spring 23 reaches the maximum forming, and the structural design improves the safety and reliability of the explosion-proof valve. The spring constant K of the spring 23 and the length of the spring rod 22 determine the bursting pressure, and the larger the spring constant is, the larger the bursting pressure of the spring 23 is, and the longer the spring rod 22 is, the larger the pressure when the spring 23 reaches the maximum stroke is. The elastic coefficient and the compression length can be adjusted and matched according to different blasting pressures.

From this, the explosion of different pressures can all be realized to a plurality of battery package explosion-proof valves 100 depending on the elasticity of spring 23, and a plurality of springs 23 can realize opening from the different burst pressure of 3KPa-10KPa in proper order simultaneously, can avoid opening the battery package simultaneously in the flame blowout, arouse the incident, improved battery package explosion-proof valve 100's security performance, can combine at random according to the burst pressure of whole package and the ventilative volume demand after the blasting simultaneously, realized the platformization design, reduced manufacturing cost simultaneously.

In addition, the elastic coefficient and the compression length of the elastic stopper 26 also affect the burst pressure. The elastic limiting piece 26 is compressed in the sealing cover 21, the elastic limiting piece 26 is abutted against the peripheral wall of the sinking groove 12 of the top cover 1, and at the moment, the elastic limiting piece 26 exerts pressure on the peripheral wall of the sinking groove 12 of the top cover 1 to play a role in increasing friction. Therefore, when setting the burst pressure, it is necessary to consider the influence of the elastic coefficient of the elastic stopper 26 and the compression length on the burst pressure.

In some embodiments, as shown in fig. 7, the top cap 1 of the battery pack explosion-proof valve 100 includes: a top cover body 13 and a plurality of stainless steel metal meshes 14. The top cap body 13 is a plastic part, the pressure relief holes 11 penetrate through the top cap body 13 along the thickness direction of the top cap body 13, a plurality of stainless steel metal nets 14 corresponding to the pressure relief holes 11 in a one-to-one mode, the stainless steel metal nets 14 are connected with the top cap body 13 and located at the corresponding pressure relief holes 11, and the stainless steel metal nets 14 and the top cap body 13 are integrally molded through injection.

Specifically, stainless steel metal mesh 14 adopts stainless steel material to have corrosion resisting property, and top cap 1 and stainless steel metal mesh 14 adopt integrative injection moulding, have practiced thrift manufacturing cost and have improved battery package explosion-proof valve 100's reliability simultaneously, and outside the battery package was directly spouted to the flame in the battery package when the battery package took place the thermal runaway, stainless steel metal mesh 14 had the effect of cooling and preventing flame to scurry out the battery package simultaneously.

Optionally, the top cover 1 is made of plastic with a flame retardant structure. Thereby, the reliability and safety of the battery pack explosion-proof valve 100 are improved.

Further, as shown in fig. 7, the cap body 13 has a rectangular plate shape, and the plurality of pressure discharge holes 11 are arranged in a matrix on the cap body 13. Wherein each pressure relief hole 11 comprises a plurality of perforations 111 arranged at intervals. From this, the surface area of battery package explosion-proof valve 100 has been fully utilized to the rectangle structure, has realized the maximum ventilative volume after the blasting.

In some embodiments, as shown in fig. 1, the pressure relief assembly 2 further comprises: a first sealing strip 27. A first sealing strip 27 extends around the pressure relief vent 11 and abuts between the sealing cover 21 and the periphery of the pressure relief vent 11. When the air pressure is balanced, the top cover 1 and the sealing cover 21 are sealed, so that the safety performance of the explosion-proof valve is improved.

In some embodiments, as shown in fig. 1, the battery pack explosion-proof valve 100 further includes: a second sealing strip 28. A second sealing strip 28 extends around the plurality of pressure relief apertures 11, the second sealing strip 28 abutting between the top cover 1 and the casing of the battery pack (not shown). When the air pressure is balanced, the battery pack explosion-proof valve 100 and the battery pack shell are sealed, so that the safety and reliability of the battery pack explosion-proof valve 100 are further improved.

In the embodiments, the sealing of the battery pack explosion-proof valve 100 and the housing, the sealing of the top cover 1 and the pressure relief assembly 2, and the sealing of the air permeable membrane 25, and the triple sealing structure design improve the safety and reliability of the battery pack explosion-proof valve 100 as a whole.

The working principle of the battery pack explosion-proof valve 100 according to the embodiment of the present invention is described in detail as follows:

when the air pressure is balanced, the pressure inside the battery pack is lower than the pressure outside the battery pack, the other end of the elastic limiting member 26 (for example, the left end of the elastic limiting member 26 shown in fig. 10) abuts against the peripheral wall of the sinking groove 12, the air outside the battery pack enters the balancing cavity 211 through the air holes 2121, then enters the ventilation channel 29 inside the spring rod 22 through the ventilation film 25, and finally enters the battery pack through the through holes 222 on the peripheral wall of the spring rod 22, so that the air pressure inside the battery pack is balanced.

In an explosion-proof pressure relief state, at this time, the pressure inside the battery pack is greater than the pressure outside the battery pack, the pressure relief assembly 2 is separated from the top cover 1, the other end of the elastic limiting member (for example, the left end of the elastic limiting member 26 shown in fig. 10) is supported on the periphery of the sinking groove 12, high-temperature and high-pressure gas inside one part of the battery pack is discharged through the pressure relief holes 11, high-temperature and high-pressure gas inside the other part of the battery pack enters the ventilation channel 29 inside the spring rod 22 through the through holes 222 on the periphery wall of the spring rod 22, then enters the balance cavity 211 through the breathable film 25, and finally is discharged through the breathable holes 2121.

According to the utility model discloses battery package explosion-proof valve 100, low burst pressure has, adapt to the characteristics of different platformizations, this battery package explosion-proof valve 100 is the rectangle structure make full use of the surface area, realize the biggest air permeability volume after the blasting, and can design into different burst pressure's split type explosion-proof valve structure according to spring structure, can realize the blasting according to whole package burst pressure and air permeability demand are hierarchical, such structural design has both avoided the battery package to arouse the cracked problem of casing because of the air permeability is not enough and has avoided the volume of opening too big too much to arouse simultaneously that too much oxygen gets into the battery package and arouse the fire, the security performance of battery package explosion-proof valve 100 has been improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A battery pack explosion-proof valve, comprising:

the top cover is in a plate body shape, and a plurality of pressure relief holes penetrating through the top cover along the thickness direction are formed in the top cover;

a plurality of pressure release subassembly, it is a plurality of pressure release subassembly and a plurality of pressure release hole one-to-one, the pressure release subassembly is established and is corresponding pressure release hole position and convertible between explosion-proof pressure release state and atmospheric pressure balanced state, be formed with the intercommunication in the pressure release subassembly the inside and outside passageway of taking a breath of battery package, the pressure release subassembly is in seal during the atmospheric pressure balanced state the pressure release hole just passes through the passageway of taking a breath is connected the inside and outside atmosphere of battery package, the pressure release subassembly is in open during explosion-proof pressure release state the pressure release hole.

2. The battery pack explosion-proof valve of claim 1, wherein the pressure relief assembly comprises:

the sealing cover is arranged on the outer side of the top cover and used for sealing the pressure relief hole;

one end of the spring rod is arranged on the inner side of the top cover, the other end of the spring rod penetrates through the top cover to be fixedly connected with the sealing cover, a flange extending outwards in the radial direction is formed at one end of the spring rod, and the flange is formed into a ring shape extending along the circumferential direction of the spring rod;

the spring is sleeved on the spring rod, one end of the spring is fixedly connected with the flange, and the other end of the spring is fixed to or abutted against the inner side surface of the top cover.

3. The explosion-proof valve of a battery pack according to claim 2, wherein a balance chamber is formed in the sealing cover, an air hole for communicating the outside atmosphere with the balance chamber is formed in the sealing cover, a mounting hole is further formed in the sealing cover,

the spring rod is formed into a cylinder shape with two open axial ends, and the other end of the spring rod penetrates through the mounting hole and extends into the balance cavity.

4. The battery pack explosion prevention valve of claim 3, wherein the sealing cover comprises: the air holes are formed on the side wall or the top wall of the sealed upper cover, the mounting holes penetrate through the bottom wall of the sealed lower cover,

the pressure relief assembly further comprises: and the connecting nut is arranged in the balance cavity and is in threaded connection with the other end of the spring rod, which extends into the balance cavity.

5. The battery pack explosion-proof valve of claim 3, wherein the pressure relief assembly further comprises: a breathable film, wherein the breathable film covers the other end of the spring rod.

6. The battery pack explosion-proof valve of claim 3, wherein a plurality of through holes penetrating in the wall thickness direction are formed on the peripheral wall of the spring rod.

7. The explosion-proof valve of a battery pack according to claim 3, wherein an inwardly depressed sink groove is formed on an outer side surface of the top cap, the pressure relief hole penetrates through a bottom wall of the sink groove in a thickness direction,

the pressure relief assembly further comprises: the anti-explosion pressure relief device comprises an elastic limiting part which is telescopic along the length direction, one end of the elastic limiting part is connected with the sealing cover, the other end of the elastic limiting part abuts against the peripheral wall of the sinking groove when the air pressure is balanced, and the other end of the elastic limiting part is supported on the peripheral edge of the sinking groove when the anti-explosion pressure relief state is achieved.

8. The battery pack explosion prevention valve of any one of claims 2 to 7, wherein the burst pressure at which at least one of the pressure relief assemblies transitions from the air pressure equilibrium state to the explosion-proof pressure relief state is different from the burst pressure of the other pressure relief assemblies in the plurality of pressure relief assemblies.

9. The battery pack explosion-proof valve of claim 8, wherein in the plurality of pressure relief assemblies, at least one of the plurality of springs has a different spring constant than the other springs and/or at least one of the plurality of spring rods has a different length than the other spring rods.

10. The battery pack explosion prevention valve of any of claims 1-7, wherein the top cap comprises:

the pressure relief hole penetrates through the top cover body along the thickness direction of the top cover body;

and a plurality of stainless steel metal nets corresponding to the pressure relief holes one to one, wherein the stainless steel metal nets are connected with the top cover body and are positioned at the corresponding pressure relief holes, and the stainless steel metal nets are integrally formed by injection molding of the top cover body.

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