CN214068848U - Explosion-proof composite part of battery pack - Google Patents
Explosion-proof composite part of battery pack Download PDFInfo
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- CN214068848U CN214068848U CN202023336392.9U CN202023336392U CN214068848U CN 214068848 U CN214068848 U CN 214068848U CN 202023336392 U CN202023336392 U CN 202023336392U CN 214068848 U CN214068848 U CN 214068848U
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- 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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Abstract
The utility model provides an explosion-proof composite part of a battery pack, which comprises a shell, a ventilation part and an explosion-proof component, wherein the shell is internally provided with the battery pack, the ventilation part is used for keeping the balance of internal and external air pressure, and the explosion-proof component is used for preventing the battery pack from exploding; the ventilating member comprises a ventilating film, the ventilating rate of the ventilating film is 0.1-1.5ml/min, the balance of the internal and external air pressure of the shell is ensured at ordinary times, and the normal work of the battery pack is facilitated; when the battery pack works abnormally, the air pressure in the shell rises, after the working pressure of the explosion-proof assembly is reached, the working pressure of the explosion-proof assembly is 20% -60% of the critical explosion pressure of the battery pack, the explosion-proof assembly can work, the ventilation rate of the explosion-proof assembly during working is 4-24ml/min, the ventilation rate is high, the gas in the shell can be discharged quickly, so that the air pressure in the shell is reduced quickly, on one hand, the breathable film can be guaranteed not to break and can be used normally, on the other hand, the battery pack can be guaranteed not to explode, and then, the life safety and the property safety are guaranteed.
Description
Technical Field
The utility model relates to a new energy automobile spare part field, more specifically the utility model relates to an explosion-proof compound piece of battery package that says so.
Background
With the rapid development of electric vehicles, the battery pack as a key component of the electric vehicle has higher and higher safety requirements. In general, the shell provided with the battery pack is provided with the waterproof breathable film, so that the waterproof and dustproof effects can be achieved, and the air exhausting effect can be achieved, so that the air pressure balance inside and outside the shell is kept; under the condition, the waterproof breathable film is broken and cannot be used continuously; even the battery pack is easy to explode due to overhigh internal air pressure, so that great potential safety hazards exist, and the development of the electric automobile is limited to a certain extent.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide an explosion-proof composite part of a battery pack; when the temperature inside the battery pack is abnormal and the air pressure inside the shell is too high, the battery pack explosion-proof composite piece can quickly discharge the gas inside the shell, so that the balance of the air pressure inside and outside the shell is ensured, and the safety is ensured.
In order to achieve the above purpose, the utility model provides a following technical scheme: an explosion-proof composite part of a battery pack comprises a shell, a ventilation part and an explosion-proof assembly, wherein the shell is internally provided with the battery pack, the ventilation part is used for keeping the internal and external air pressure balance, the explosion-proof assembly is used for preventing the battery pack from exploding, and the ventilation part and the explosion-proof assembly are both positioned on the shell; the ventilating piece comprises a ventilating film, and the ventilating rate of the ventilating film is 0.1-1.5 ml/min; the working pressure of the explosion-proof assembly is 20% -60% of the critical explosion pressure of the battery pack; the ventilation rate of the explosion-proof component is 4-24ml/min when the explosion-proof component works; the bursting pressure of the breathable film is 60% -90% of the critical bursting pressure of the battery pack.
The utility model discloses a battery pack explosion-proof composite piece, which comprises a shell, a ventilation piece and an explosion-proof component, wherein a battery pack for providing new energy automobile power is arranged in the shell; the air permeable piece and the explosion-proof assembly are both arranged on the shell of the shell and are detachably connected with the shell, such as in threaded connection; the shell is provided with a ventilation port, the ventilation piece comprises a ventilation shell and a ventilation film (preferably a waterproof ventilation film), the ventilation film covers the ventilation port, the ventilation rate of the ventilation film is 0.1-1.5ml/min, and the preferable ventilation rate is 0.3-1.2 ml/min; at ordinary times, gas inside and outside the shell is exchanged through the breathable film, so that the pressure inside and outside the shell is kept balanced, and the normal work of the battery pack is ensured; in order to prolong the service life of the breathable film, a supporting piece can be arranged in the breathable shell and used for supporting the breathable film, so that the service life of the breathable film is prolonged; the explosion-proof assembly is mainly used for preventing the battery pack from exploding, and ensuring the life safety of personnel (drivers and passengers) in the automobile and the property safety of new energy automobiles and the like; the ventilation rate of the explosion-proof component during working is 4-24ml/min, preferably 6-20ml/min, and the ventilation rate of the explosion-proof component during working is far greater than that of the breathable film; at ordinary times, because the air pressure in the shell is low, the explosion-proof assembly does not work, and the air inside and outside the shell cannot exchange air through the explosion-proof assembly, namely the ventilation rate of the explosion-proof assembly is considered to be 0, so that dust, rainwater and other impurities outside the shell cannot enter the shell through the explosion-proof assembly, and the normal work of the battery pack cannot be influenced; the explosion-proof assembly can work only when the air pressure in the shell reaches a certain value, and the working pressure of the explosion-proof assembly in the utility model is 20% -60% of the critical explosion pressure of the battery pack, preferably 25% -50%; the critical explosion pressure of the battery pack in the utility model means that the battery pack reaches the internal pressure of the shell before explosion on the premise that the shell provided with the battery pack is totally closed; if the explosion-proof component does not work any more, on one hand, the air-permeable membrane is broken and cannot work any more, and on the other hand, the battery pack is exploded to harm life safety and property safety;
when the work of the battery pack is abnormal and the temperature in the battery pack rapidly rises, the air pressure in the shell also rapidly increases, at the moment, the ventilation rate of the breathable film is limited, so that the rise of the air pressure in the shell cannot be prevented, along with the rise of the air pressure in the shell, the explosion-proof component can work after the working pressure of the explosion-proof component is reached, and due to the fact that the ventilation rate of the explosion-proof component is high, the gas in the shell can be rapidly discharged after the explosion-proof component starts to work, so that the air pressure in the shell is rapidly reduced, on one hand, the breathable film can be ensured not to be broken and can be normally used, on the other hand, the battery pack is ensured not to explode, and further, the life safety and the property safety are ensured; in addition, under some extreme conditions (for example, external impurities block a ventilation channel of the explosion-proof component), even if the air pressure in the shell reaches the working pressure of the explosion-proof component, the explosion-proof component still cannot work normally, the air pressure in the shell continues to rise, and the battery pack is easy to explode at the moment, so that the life safety of a driver and the property safety of other objects are affected; the explosion pressure of the breathable film in the utility model is 60% -90%, preferably 65% -85% of the critical explosion pressure of the battery pack, namely the explosion pressure of the breathable film is higher than the working pressure of the explosion-proof component, so that the breathable film is prevented from being exploded too early, and the breathable film can be exploded only when the explosion-proof component cannot work normally; when the air pressure in the shell reaches the explosion pressure of the breathable film, the breathable film is broken, the gas in the shell is quickly discharged without the blockage of the breathable film, so that the air pressure in the shell is quickly reduced, and the explosion possibility of the battery pack is reduced; even if the explosion of the battery pack cannot be prevented, the explosion of the battery pack can be delayed, so that a driver and passengers can conveniently and quickly escape, and the life safety is ensured.
As a further improvement of the utility model, the working pressure of the explosion-proof component is 10-30 KPa; the capacity of the battery pack is 10-200 kwh; when the air pressure in the shell reaches the working pressure of the explosion-proof assembly, the air permeability of the explosion-proof assembly within 3s is 0.05-0.95 ml.
In the utility model, the capacity of the battery pack is 10kwh-200kwh, the larger the capacity of the battery pack is, the more easily the battery pack explodes after the air pressure in the shell rises, so the higher the ventilation rate of the explosion-proof component is, and the more gas is discharged from the shell in the same time (the larger the ventilation quantity of the explosion-proof component is); namely, the ventilation rate (ventilation amount per unit time) of the explosion-proof assembly is positively correlated with the capacity of the battery pack; in the utility model, the working pressure of the explosion-proof component is 10-30KPa, when the internal air pressure of the shell reaches the working pressure of the explosion-proof component, the explosion-proof component can work immediately, the ventilation rate can reach the maximum value from 0 quickly, so that the gas in the shell can be discharged quickly, and the ventilation quantity of the explosion-proof component can reach 0.05-0.95ml within 3s, thereby quickly reducing the internal air pressure of the shell, on one hand, the ventilation membrane can be ensured not to break, and the explosion-proof component can be used continuously; on the other hand, the battery pack can be prevented from exploding, the life safety of personnel and the corresponding property safety are guaranteed, and the safety performance is guaranteed.
As a further improvement of the utility model, the shell is provided with an explosion-proof opening, and the explosion-proof assembly comprises an explosion-proof shell, a plug for plugging the explosion-proof opening and a spring; a cavity is formed in the explosion-proof shell and communicated with the explosion-proof opening; the explosion-proof shell is provided with a plurality of air vents communicated with the cavity; the plug and the spring are located in the cavity, one end of the spring is fixedly connected with the inner wall of the cavity, the other end of the spring is fixedly connected with the plug, and the spring keeps the plug to plug the explosion-proof opening when not subjected to external force.
The explosion-proof component in the utility model comprises an explosion-proof shell, a plug and a spring; the explosion-proof shell is detachably connected with the shell provided with the battery pack, for example, the explosion-proof shell is fixed on the shell through threaded connection, or the explosion-proof shell can be fixed on the shell through other detachable connection modes; the shell is provided with an explosion-proof opening, a cavity is formed in the explosion-proof shell, the explosion-proof shell is provided with a plurality of vent holes, and the explosion-proof opening, the inner cavity and the vent holes are communicated with each other, so that gas in the shell can pass through the explosion-proof opening, the inner cavity and the vent holes and then be discharged into the external environment, and the gas pressure in the shell is reduced; the plug and the spring are both positioned in the cavity of the explosion-proof shell, one end of the spring is fixedly connected with the inner wall of the cavity, the other end of the spring is connected with the plug, the plug is used for plugging the explosion-proof opening, so that external sundries are prevented from easily passing through the cavity, and the explosion-proof opening enters the shell so as to influence the normal work of the battery pack; when the battery pack works normally, because the air pressure in the shell is low, the acting force of the gas in the shell on the plug is small, at the moment, the spring can enable the plug to block the explosion-proof opening all the time, and external sundries cannot enter the shell, so that the normal work of the battery pack is ensured, and the service life of the battery pack is not influenced; and when the battery package work was unusual, the inside atmospheric pressure of shell increases gradually, the inside gaseous effort to the end cap of shell also further increases, reach explosion-proof subassembly's operating pressure back when the inside atmospheric pressure of shell, the inside gaseous effort to the end cap of shell is enough big this moment, it can let the spring shrink to be big enough, take place deformation, thereby make the end cap to the one side removal that deviates from explosion-proof mouthful, the explosion-proof mouth just can't be stopped up again to the end cap this moment, the inside gas of shell just can pass through explosion-proof mouthful, the cavity, the blow vent discharges in the external environment, then the inside atmospheric pressure of shell just can reduce fast, can guarantee on the one hand so that the ventilated membrane can not break and can also normal use, on the other hand can guarantee that the battery package can not explode, then guarantee life safety and property safety.
As a further improvement of the utility model, the elastic modulus of the spring is 65-85 MPa; the shear modulus of the spring is 180-220 GPa; the tolerance temperature of the spring is-50 ℃ to 300 ℃.
In normal times, the spring needs to keep the plug to block the explosion-proof opening; when the battery pack works abnormally, after the air pressure in the shell is increased to the working pressure of the explosion-proof assembly, the explosion-proof assembly works immediately, namely, the spring needs to deform immediately to drive the plug to move to one side close to the inner wall of the cavity (the side far away from the explosion-proof opening), so that the aim of quickly exhausting and reducing the pressure is fulfilled; therefore, the selection of the spring is crucial, and the material of the spring is preferably stainless steel, so that the material is cheap and good; in the utility model, the elastic modulus of the spring is 65-85MPa, the shear modulus is 180-220GPa, and the tolerance temperature is-50-300 ℃; on one hand, the influence of temperature change on the performance of the spring is ensured to be small, and on the other hand, the plug can be ensured to always block the explosion-proof opening at ordinary times, so that external sundries are prevented from entering the shell through the explosion-proof opening to influence the normal work of the battery pack; after the air pressure in the shell is increased to the working pressure of the explosion-proof assembly, the spring can be quickly deformed to drive the plug to move, so that the plug does not block the explosion-proof opening any more, the air pressure in the shell is conveniently and quickly reduced, and the life safety and the property safety are ensured;
as a further improvement of the utility model, the diameter of the spring is 0.2-0.5 mm; the pitch diameter of the spring is 4-7 mm; the effective number of turns of the spring is 15-20 turns, and the free height of the spring is 15-20 mm.
The structural parameters influencing the performance of the spring at present mainly comprise four influencing factors of the diameter, the intermediate diameter, the effective number of turns and the free height of the spring, and in order to ensure that the spring used in the utility model has excellent elastic modulus and shear modulus, the diameter of the spring is 0.2-0.5 mm; the pitch diameter of the spring is 4-7 mm; the effective number of turns of the spring is 15-20 turns, the free height of the spring is 15-20mm, and the spring can have excellent elastic modulus and shear modulus under the matching of the structural parameters, so that the plug is ensured to block the explosion-proof opening all the time at ordinary times; after the air pressure in the shell is increased to the working pressure of the explosion-proof assembly, the spring can be quickly deformed to drive the plug to move.
As a further improvement of the utility model, the ventilation rate of the breathable film is 0.3-1.2 ml/min; the working pressure of the explosion-proof assembly is 25% -50% of the critical explosion pressure of the battery pack; the ventilation rate of the explosion-proof component during working is 6-20 ml/min; the bursting pressure of the breathable film is 65% -85% of the critical bursting pressure of the battery pack.
As a further improvement of the utility model, the plug comprises a head part for inserting the explosion-proof opening, a tail part for connecting the spring, and a middle part for connecting the head part and the tail part; the inner diameter length of the explosion-proof port is 1.05-1.2 times of the diameter length of the head part; a sealing ring is arranged on the middle part; the diameter length of the middle part is 1.4 to 1.8 times of the diameter length of the head part.
The utility model is mainly divided into 3 parts of head, middle and tail; the head part, the middle part and the tail part can be integrally formed to obtain the plug required by the utility model, such as injection molding; the tail part is used for connecting the spring, namely one end of the spring, which is far away from the inner wall of the cavity, is fixedly connected with the tail part, the head part is used for being inserted into the explosion-proof opening, the diameter of the head part is slightly smaller than the inner diameter of the explosion-proof opening, and the length of the inner diameter of the explosion-proof opening is 1.05-1.2 times of the length of the head part; the diameter of the head part is smaller than the inner diameter of the explosion-proof opening, so that no force is applied between the head part and the inner wall of the explosion-proof opening, even if force is applied, the force is small, the plug can be guaranteed to move to one side away from the explosion-proof opening immediately after the spring contracts and deforms (at the moment, the head part is not inserted into the explosion-proof opening any more), the purpose of quickly exhausting and reducing pressure is achieved, and if the diameter of the head part is equal to the inner diameter of the explosion-proof opening, a large force is applied between the head part and the inner wall of the explosion-proof opening, the movement of the plug head part can be hindered due to the force, and the purpose of quickly exhausting and reducing pressure cannot be achieved; the diameter of the head part is only slightly smaller than the inner diameter of the explosion-proof opening, the difference of the diameters of the head part and the explosion-proof opening cannot be too large, the head part is guaranteed to basically block the explosion-proof opening, and then the middle part and the tail part are matched to guarantee that the plug can block the explosion-proof opening; the diameter length of the middle part is 1.4-1.8 times of the diameter length of the head part, which also indicates that the diameter length of the middle part is larger than the inner diameter of the explosion-proof opening, and the explosion-proof opening can be completely blocked by the plug head through the matching of the parameters of the head part and the middle part; simultaneously through being provided with the sealing washer in the middle part, further improved the leakproofness, guaranteed when the end cap plugs up explosion-proof mouthful, inside the less impurity of particle size such as external acid rain also can't enter into the shell, influence the normal work of battery package and then influence its life, guaranteed that the battery package has longer life.
As a further improvement, the one end that the middle part is close to the head is provided with first grip block, the one end that the middle part is close to the afterbody is provided with the second grip block, the sealing washer is located between first grip block and the second grip block, the external diameter of first grip block is less than the external diameter of second grip block.
When an automobile runs, the automobile body sometimes shakes greatly (for example, when the automobile turns at a high speed), and at the moment, the sealing ring also shakes greatly, so that the sealing effect of the sealing ring can be influenced; the utility model discloses a be provided with first grip block and second grip block, the sealing washer is located first grip block and second grip block, and first grip block and second grip block can be fine with the sealing washer centre gripping, reduce rocking of sealing washer to guaranteed the whole sealed effect, guarantee the life of battery package then; meanwhile, in order to further improve the sealing performance, a spring can be arranged at the joint of the explosion-proof shell and the shell, so that the integral sealing effect can be ensured; in addition, the outer diameter of the first clamping block is smaller than that of the second clamping block, so that the installation of the plug is facilitated, and the plug is arranged in the cavity of the explosion-proof shell conveniently.
As a further improvement of the utility model, the side wall surface of the cavity, which is attached to the sealing ring, is an inclined surface; one side that the cavity inner wall is close to the afterbody is provided with the stopper, the spring housing is established on the stopper.
The limiting block is arranged on one side, close to the tail part of the plug, of the inner wall of the cavity, the limiting block is fixed on the inner wall of the cavity, and one end, close to the interior of the cavity, of the spring is sleeved on the limiting block, so that the limiting block plays a supporting role on the spring, and the plug is guaranteed to be blocked by the plug when the spring is free from external force; in addition, the limiting block can also limit the plug, and simultaneously, the deformation quantity of the spring is ensured not to be overlarge, if the internal air pressure of the shell is overlarge, the internal air pressure can generate a larger pressure action on the plug, and if the limiting block does not exist, on one hand, the deformation quantity of the spring is possibly overlarge, exceeds the self elastic deformation, and cannot be used again; on the other hand, the plug is too large to move, and the plug cannot be recovered subsequently, namely the explosion-proof opening cannot be completely plugged, so that the work of the battery pack is influenced; in addition, this practical cavity inside is the inclined plane with the lateral wall face that the sealing washer was laminated mutually, and the inclined plane has mainly played the effect of a guide, and after atmospheric pressure inside the shell recovered normal atmospheric pressure, the inclined plane can guide the end cap to reply initial position to plug up explosion-proof mouthful completely, guarantee the normal work of battery package then.
As a further improvement of the utility model, the number of the vent holes on the explosion-proof shell is 2-10, and the area of the surface of the vent hole is 5-20mm2。
The surface area of the vent in the utility model is 5-20mm2The number of the air vents is 2-10, and the air vents with the sizes and the number ensure the air ventilation rate of the explosion-proof assembly during working on one handWhen the explosion-proof component works, the purposes of quickly exhausting and reducing pressure in the shell can be achieved; on the other hand when explosion-proof assembly was out of work, prevented that external impurity particulate matter from entering into the cavity in, stopped up the inside passageway of cavity to make when the inside atmospheric pressure of shell was too high, effectual removal can not take place for the end cap, the unable normal work of explosion-proof assembly promptly, in time the exhaust step-down.
The utility model has the advantages that: by arranging the explosion-proof component, the ventilation rate of the explosion-proof component is 4-24ml/min when the explosion-proof component works, and the ventilation rate is high; when the battery pack works abnormally, the air pressure in the shell is increased to the working pressure of the explosion-proof assembly, and then the explosion-proof assembly works; due to the fact that the air permeability rate of the explosion-proof assembly is high, after the explosion-proof assembly works, gas in the shell can be rapidly discharged, so that air pressure in the shell is rapidly reduced, on one hand, the air permeable membrane can be prevented from being broken and can be normally used, on the other hand, the battery pack can be prevented from being exploded, and then life safety and property safety are guaranteed; in addition, reach explosion-proof assembly's operating pressure when the inside atmospheric pressure of shell, explosion-proof assembly still can't normally work, and the utility model discloses well ventilated membrane's burst pressure is 60% -90% of the critical explosion pressure of battery package, and behind the burst pressure of the inside atmospheric pressure arrival ventilated membrane of shell, the ventilated membrane will break, and ventilation rate improves greatly to delay and avoid the battery package explosion even.
Drawings
Fig. 1 is a schematic structural view of an explosion-proof composite member of a battery pack when the battery pack of the present invention is in normal operation;
FIG. 2 is a schematic structural view of the explosion-proof composite member of the battery pack when the battery pack of the present invention is abnormally operated and the explosion-proof assembly is operated;
FIG. 3 is a schematic structural view of the explosion-proof composite member of the battery pack of the present invention when the battery pack is abnormally operated and the explosion-proof assembly cannot operate and the air-permeable membrane is exploded;
FIG. 4 is a schematic structural view of an explosion-proof assembly of the present invention;
reference numerals: 1. a housing; 11. a battery pack; 12. an explosion-proof port; 2. a gas permeable member; 21. a gas permeable membrane; 22. a gas permeable shell; 3. an explosion-proof assembly; 31. an explosion-proof shell; 311. a cavity; 312. a vent; 313. a bevel; 314. a limiting block; 32. a plug; 321. a head portion; 322. a middle part; 323. a tail portion; 324. a seal ring; 325. a first clamping block; 326. a second clamping block; 33. a spring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 0.8 ml/min; the working pressure of the explosion-proof assembly 3 is 35% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 13ml/min when the component works; the explosion pressure of the breathable film 21 is 75% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 18 KPa; the capacity of the battery pack 11 is 100 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 75 MPa; the shear modulus of the spring 33 is 200 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.35 mm; the pitch diameter of the spring 33 is 5.35 mm; the effective number of turns of the spring 33 is 19, the free height of the spring is 16.7mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.12 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.6 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 6, and the area of the surface of the air vent 312 is 12mm2。
Example 2
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 0.25 ml/min; the working pressure of the explosion-proof component 3 is 25% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 6ml/min when the component works; the explosion pressure of the breathable film 21 is 65% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 14 KPa; the capacity of the battery pack 11 is 30 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 66 MPa; the shear modulus of the spring 33 is 185 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.30 mm; the pitch diameter of the spring 33 is 4.5 mm; the effective number of turns of the spring 33 is 17, the free height of the spring is 19.5mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.08 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.5 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the vent holes 312 on the explosion-proof shell 31 is 4, and the area of the surface of the vent hole 312 is 8mm2。
Example 3
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 0.5 ml/min; the working pressure of the explosion-proof component 3 is 30% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 9ml/min when the component works; the explosion pressure of the breathable film 21 is 70% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 16 KPa; the capacity of the battery pack 11 is 70 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 70 MPa; the shear modulus of the spring 33 is 195 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.35 mm; the pitch diameter of the spring 33 is 5.5 mm; the effective number of turns of the spring 33 is 18 turns, the free height of the spring is 18.0mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.08 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.5 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 4, and the area of the surface of the air vent 312 is 12mm2。
Example 4
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 1.1 ml/min; the working pressure of the explosion-proof assembly 3 is 40% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 17ml/min when the component works; the explosion pressure of the breathable film 21 is 80% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 20 KPa; the capacity of the battery pack 11 is 140 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 80 MPa; the shear modulus of the spring 33 is 205 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.40 mm; the middle diameter of the spring 33 is 5.00 mm; the effective number of turns of the spring 33 is 18 turns, the free height of the spring is 16.0mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.14 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.7 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 8, and the area of the surface of the air vent 312 is 12mm2。
Example 5
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 1.4 ml/min; the working pressure of the explosion-proof assembly 3 is 45% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 20ml/min when the component works; the explosion pressure of the breathable film 21 is 85% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 22 KPa; the capacity of the battery pack 11 is 180 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 85 MPa; the shear modulus of the spring 33 is 215 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.45 mm; the pitch diameter of the spring 33 is 6 mm; the effective number of turns of the spring 33 is 20, the free height of the spring is 15.5mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.16 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.7 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 8, and the area of the surface of the air vent 312 is 14mm2。
Comparative example 1
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 0.8 ml/min; the working pressure of the explosion-proof assembly 3 is 35% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 13ml/min when the component works; the explosion pressure of the breathable film 21 is 75% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 18 KPa; the capacity of the battery pack 11 is 100 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 110 MPa; the shear modulus of the spring 33 is 240 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.6 mm; the pitch diameter of the spring 33 is 5.5 mm; the effective number of turns of the spring 33 is 22, the free height of the spring is 14mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.00 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.6 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 6, and the area of the surface of the air vent 312 is 12mm2。
Comparative example 2
An explosion-proof composite part of a battery pack comprises a shell 1, a ventilating piece 2 and an explosion-proof assembly 3, wherein the shell 1 is internally provided with the battery pack 11, the ventilating piece 2 is used for keeping the internal and external air pressure balance, the explosion-proof assembly 3 is used for preventing the battery pack 11 from exploding, and the ventilating piece 2 and the explosion-proof assembly 3 are both positioned on the shell 1; the air permeable member 2 comprises an air permeable membrane 21, and the air permeable rate of the air permeable membrane 21 is 0.8 ml/min; the working pressure of the explosion-proof assembly 3 is 35% of the critical explosion pressure of the battery pack 11; the ventilation rate of the explosion-proof component 3 is 13ml/min when the component works; the explosion pressure of the breathable film 21 is 75% of the critical explosion pressure of the battery pack 11;
the working pressure of the explosion-proof component 3 is 18 KPa; the capacity of the battery pack 11 is 100 kwh;
the shell 1 is provided with an explosion-proof opening 12, and the explosion-proof assembly 3 comprises an explosion-proof shell 31, a plug 32 for plugging the explosion-proof opening 12 and a spring 33; a cavity 311 is formed in the explosion-proof shell 31, and the cavity 311 is communicated with the explosion-proof opening 12; the explosion-proof shell 31 is provided with a plurality of air vents 312 communicated with the cavity 311; the plug 32 and the spring 33 are both located in the cavity 311, one end of the spring 33 is fixedly connected with the inner wall of the cavity 311, the other end of the spring 33 is fixedly connected with the plug 32, and the spring 33 keeps the plug 32 to block the explosion-proof opening 12 when external force is not applied.
The elastic modulus of the spring 33 is 110 MPa; the shear modulus of the spring 33 is 240 GPa; the tolerance temperature of the spring 33 is-50-300 ℃; the diameter of the spring 33 is 0.5 mm; the pitch diameter of the spring 33 is 5.5 mm; the effective number of turns of the spring 33 is 21, the free height of the spring is 16mm, and the spring is made of stainless steel;
the plug 32 comprises a head 321 for inserting the explosion-proof opening 12, a tail 323 for connecting the spring 33 and a middle 322 for connecting the head 321 and the tail 323; the inner diameter length of the explosion-proof port 12 is 1.03 times of the diameter length of the head 321; a sealing ring 324 is arranged on the middle part 322; the diameter length of the middle part 322 is 1.6 times of that of the head part 321; one end of the middle part 322 close to the head part 321 is provided with a first clamping block 325, one end of the middle part 322 close to the tail part 323 is provided with a second clamping block 326, the sealing ring 324 is positioned between the first clamping block 325 and the second clamping block 326, and the outer diameter of the first clamping block 325 is smaller than that of the second clamping block 326.
The side wall surface of the cavity 311, which is attached to the sealing ring 324, is an inclined surface 313; a limiting block 314 is arranged on one side of the inner wall of the cavity 311 close to the tail part 323, and the spring 33 is sleeved on the limiting block 314;
the number of the air vents 312 on the explosion-proof shell 31 is 6, and the area of the surface of the air vent 312 is 12mm2。
And (3) performance testing:
when the air pressure in each sample shell reaches the working pressure of the explosion-proof assembly, testing the air permeability of each sample explosion-proof assembly in 3s by using an air permeability tester, wherein if the air permeability is 0, the explosion-proof assembly is considered to be not normally started to work;
| test specimen | Permeability/ml |
| Example 1 | 0.42 |
| Example 2 | 0.15 |
| Example 3 | 0.28 |
| Example 4 | 0.67 |
| Example 5 | 0.84 |
| Comparative example 1 | 0 |
| Comparative example 2 | 0.03 |
As can be seen from the above table, when the air pressure inside the housing of comparative example 1 reaches the working pressure of the explosion-proof assembly, the explosion-proof assembly does not work normally, so that the purpose of exhausting and reducing the pressure cannot be achieved, on one hand, the rupture of the gas-permeable membrane can be caused, and meanwhile, the explosion of the battery pack is easily caused, so that the life safety and the property safety are harmed; the air pressure in the shell of the comparative example 2 reaches the working pressure of the explosion-proof assembly, the working speed of the explosion-proof assembly is too low, the aim of exhausting and reducing the pressure cannot be achieved in a short time, and the battery pack still easily explodes, so that the life safety and the property safety are harmed; and the atmospheric pressure of the inside shell of embodiment 1-5 reaches the operating pressure of explosion-proof subassembly, and explosion-proof subassembly fast work to realize the purpose of quick exhaust step-down, guarantee on the one hand that the ventilated membrane can not break, on the other hand avoids the explosion of battery package, guarantees personnel's in the car life safety and corresponding property safety.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An explosion-proof composite for a battery pack, comprising: the battery pack explosion-proof device comprises a shell, a ventilation piece and an explosion-proof assembly, wherein the shell is internally provided with a battery pack, the ventilation piece is used for keeping the internal and external air pressure balance, and the explosion-proof assembly is used for preventing the battery pack from exploding; the ventilating piece comprises a ventilating film, and the ventilating rate of the ventilating film is 0.1-1.5 ml/min; the working pressure of the explosion-proof assembly is 20% -60% of the critical explosion pressure of the battery pack; the ventilation rate of the explosion-proof component is 4-24ml/min when the explosion-proof component works; the bursting pressure of the breathable film is 60% -90% of the critical bursting pressure of the battery pack.
2. The battery pack explosion-proof composite of claim 1, wherein: the working pressure of the explosion-proof assembly is 10-30 KPa; the capacity of the battery pack is 10-200 kwh; when the air pressure in the shell reaches the working pressure of the explosion-proof assembly, the air permeability of the explosion-proof assembly within 3s is 0.05-0.95 ml.
3. The battery pack explosion-proof composite of claim 2, wherein: the shell is provided with an explosion-proof opening, and the explosion-proof assembly comprises an explosion-proof shell, a plug for plugging the explosion-proof opening and a spring; a cavity is formed in the explosion-proof shell and communicated with the explosion-proof opening; the explosion-proof shell is provided with a plurality of air vents communicated with the cavity; the plug and the spring are located in the cavity, one end of the spring is fixedly connected with the inner wall of the cavity, the other end of the spring is fixedly connected with the plug, and the spring keeps the plug to plug the explosion-proof opening when not subjected to external force.
4. The explosion-proof composite of a battery pack as set forth in claim 3, wherein the elastic modulus of the spring is 65-85 MPa; the shear modulus of the spring is 180-220 GPa; the tolerance temperature of the spring is-50 ℃ to 300 ℃.
5. The battery pack explosion-proof composite of claim 4, wherein: the diameter of the spring is 0.2-0.5 mm; the pitch diameter of the spring is 4-7 mm; the effective number of turns of the spring is 15-20 turns, and the free height of the spring is 15-20 mm.
6. The battery pack explosion-proof composite of claim 1, wherein: the ventilation rate of the breathable film is 0.3-1.2 ml/min; the working pressure of the explosion-proof assembly is 25% -50% of the critical explosion pressure of the battery pack; the ventilation rate of the explosion-proof component during working is 6-20 ml/min; the bursting pressure of the breathable film is 65% -85% of the critical bursting pressure of the battery pack.
7. The battery pack explosion-proof composite of claim 3, wherein: the plug comprises a head part for inserting into the explosion-proof opening, a tail part for connecting the spring and a middle part for connecting the head part and the tail part; the inner diameter length of the explosion-proof port is 1.05-1.2 times of the diameter length of the head part; a sealing ring is arranged on the middle part; the diameter length of the middle part is 1.4 to 1.8 times of the diameter length of the head part.
8. The battery pack explosion-proof composite of claim 7, wherein: the middle part is close to the one end of head and is provided with first grip block, the middle part is close to the one end of afterbody and is provided with the second grip block, the sealing washer is located between first grip block and the second grip block, the external diameter of first grip block is less than the external diameter of second grip block.
9. The battery pack explosion-proof composite of claim 7, wherein: the side wall surface of the cavity, which is attached to the sealing ring, is an inclined surface; one side that the cavity inner wall is close to the afterbody is provided with the stopper, the spring housing is established on the stopper.
10. The battery pack explosion-proof composite of claim 3, wherein: 2-10 air vents are arranged on the explosion-proof shell, and the surface area of the air vents is 5-20mm2。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114216054A (en) * | 2021-12-23 | 2022-03-22 | 北京三盈联合石油技术有限公司 | LNG adds mechanism of qi and LNG gas station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114216054A (en) * | 2021-12-23 | 2022-03-22 | 北京三盈联合石油技术有限公司 | LNG adds mechanism of qi and LNG gas station |
| CN114216054B (en) * | 2021-12-23 | 2023-03-10 | 北京三盈联合石油技术有限公司 | LNG adds mechanism of qi and LNG gas station |
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