CN210576118U

CN210576118U - Battery pack flame-retardant mechanism and battery pack

Info

Publication number: CN210576118U
Application number: CN201921765049.0U
Authority: CN
Inventors: 林水杉; 杨政杰; 杜禾; 吴珍荣
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-05-19
Anticipated expiration: 2029-10-18

Abstract

The utility model discloses a fire-retardant mechanism of battery package and battery package, fire-retardant mechanism of battery package include fire-retardant housing and choker, and the choker sets up in the inboard of battery package box. The flow resisting piece is provided with a first pressure relief channel, a second pressure relief channel is formed by enclosing between the flow resisting piece and the flame-retardant housing, a third pressure relief channel is formed in the flame-retardant housing, the third pressure relief channel, the second pressure relief channel, the first pressure relief channel and the pressure relief hole are communicated with each other, and the second pressure relief channel and the first pressure relief channel form a flow resisting channel. The high-speed air current that produces because of the explosion in the battery package gets into second pressure release passageway and first pressure release passageway by third pressure release passageway in, after the two guide effect, by the fast outside of discharging of pressure release hole, like this, battery package internal pressure can release, has reduced the whole possibility of bursting of battery package, and the choked flow passageway can prolong again or the separation outside air gets into in the battery package box, avoids the flame that the inside burning of battery package arouses to the outside.

Description

Battery pack flame-retardant mechanism and battery pack

Technical Field

The utility model belongs to the technical field of the battery protection, concretely relates to battery package fire-retardant mechanism and have battery package of this battery package fire-retardant mechanism.

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, many traditional 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. Particularly, with the gradual increase of the design of the battery pack with the heat management function, the condensation phenomenon is very easy to occur in the south with temperature difference and high humidity, once the condensation is generated in the battery pack, if the condensation drops on a circuit of the battery pack, the short circuit of the battery pack is easily caused, and even the fire and explosion are easily caused.

At present, the battery pack mainly adopts an explosion-proof valve as an explosion-proof device of the battery pack, the explosion-proof valve is fixed on the outer side of a battery pack box body through a screw and corresponds to a pressure relief hole, and the explosion-proof valve is provided with a layer of film and blocks the pressure relief hole. When the inside of the battery pack catches fire and generates air pressure to enable the pressure inside the box body to reach a critical value, the film is broken due to compression, so that the pressure inside the battery pack is released, and the whole explosion of the battery pack is effectively prevented.

However, during the pressure relief, the flame in the battery pack is also easy to break through the film of the explosion-proof valve and burn to the outside of the battery pack, and finally the whole automobile is burnt. Therefore, it is required to solve the problem that the conventional battery pack burns to the outside due to internal ignition.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a battery pack flame-retardant mechanism, which aims to solve the problem that the existing battery pack burns to the outside due to the internal ignition of the battery pack.

The utility model discloses the technological effect that will reach is realized through following scheme:

the utility model provides a fire-retardant mechanism of battery package for install the inboard at battery package box, the pressure release hole has been seted up on the battery package box, including fire-retardant housing and set up in the choked flow piece of the inboard of battery package box, the choked flow piece has first pressure release passageway, fire-retardant housing lid is established the choked flow piece just locates the inboard of battery package box, the choked flow piece with enclose between the fire-retardant housing and close and form second pressure release passageway, third pressure release passageway has been seted up on the fire-retardant housing, third pressure release passageway second pressure release passageway first pressure release passageway with the pressure release hole communicates each other, second pressure release passageway with first pressure release passageway forms and is used for the extension air current third pressure release passageway with the choked flow passageway of flow time between the pressure release hole.

Specifically, the flame-retardant housing and the flow resisting piece are both fixedly connected to the inner side wall of the battery pack box.

Specifically, the choked flow spare is including the body that is hollow structure, the body include first end and with the second end that first end is relative, the body the first end encloses to be located the pressure release hole, the body the second end with form the clearance between the fire-retardant housing, the lateral wall of fire-retardant housing has been seted up third pressure release passageway.

Furthermore, the flow resisting piece further comprises a one-way vent valve, and the second end of the pipe body is sleeved with the one-way vent valve.

Further, the choke piece still includes the shroud, the shroud is located the body with between the fire-retardant housing, the choke piece with enclose between the fire-retardant housing and close and form fourth pressure release passageway, the shroud with enclose between the fire-retardant housing and close and form fifth pressure release passageway, fourth pressure release passageway with fifth pressure release passageway constitutes second pressure release passageway, the shroud is kept away from third pressure release passageway's distolateral sixth pressure release passageway has been seted up, fourth pressure release passageway pass through sixth pressure release passageway communicate in fifth pressure release passageway.

Specifically, the open end of the cover casing is fixedly connected to the inner side wall of the battery pack box.

Preferably, the size of the inner diameter of the sixth pressure relief channel gradually decreases from the air inlet direction to the air outlet direction.

Or, the choked flow piece includes the barrel, the open end of barrel encloses and establishes pressure release hole and fixed connection in the inside wall of battery package box, the lateral wall of fire-retardant housing has been seted up third pressure release passageway, the barrel is kept away from third pressure release passageway's distolateral seted up first pressure release passageway.

Or, the choked flow piece includes the barrel, the open end of barrel encloses and establishes pressure release hole and fixed connection in the inside wall of battery package box, fire-retardant housing is kept away from the distolateral side of pressure release hole has been seted up third pressure release channel, the lateral wall of barrel has been seted up first pressure release channel.

Preferably, the size of the inner diameter of the first pressure relief channel gradually decreases from the air inlet direction to the air outlet direction.

Preferably, the size of the inner diameter of the third pressure relief channel gradually decreases from the air inlet direction to the air outlet direction.

The utility model has the advantages that: the utility model discloses a fire-retardant mechanism of battery package, its working process as follows: high-speed air current that produces because of the explosion in the battery package gets into in second pressure release passageway and the first pressure release passageway by the third pressure release passageway of fire-retardant housing, behind the guide effect of first pressure release passageway and second pressure release passageway, discharge outside fast by the pressure release hole of battery package, thus, battery package internal pressure can release, the whole possibility of bursting of battery package has been reduced, and simultaneously, first pressure release passageway and second pressure release passageway form the choked flow passageway and can prolong or the separation outside air gets into in the battery package box again, avoid outside air directly to get into inside the battery package promptly, combustion-supporting explosion process, thus, the flame that the inside burning of battery package arouses then can not burn to the battery package outside.

The utility model also provides a battery package, including the aforesaid battery package fire-retardant mechanism.

Further, still include explosion-proof valve, explosion-proof valve install in the outside of battery package box and shutoff the pressure release hole.

The utility model has the advantages that: the utility model discloses a battery package, on the basis that has above-mentioned battery package fire-retardant mechanism, the safety in utilization of this battery package is higher, is difficult for appearing the condition of the outside burning of battery package.

Drawings

Fig. 1 is an exploded view of a flame retardant mechanism of a battery pack according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a battery pack fire retardant mechanism according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a battery pack flame retardant mechanism provided in an embodiment of the present invention;

fig. 4 is a cross-sectional view of a fire retardant mechanism of a battery pack according to a third embodiment of the present invention;

fig. 5 is a cross-sectional view of a flame retardant mechanism of a battery pack according to a fourth embodiment of the present invention;

fig. 6 is a cross-sectional view of a battery pack fire-retardant mechanism provided by the fifth embodiment of the present invention.

The reference numerals are explained below:

100. a battery pack flame retardant mechanism; 200. a battery pack case; 300. a pressure relief vent; 400. an explosion-proof valve; 10. a flame-retardant housing; 20. a flow-impeding component; 30. a flow-blocking passage; 21. a first pressure relief passage; 22. a second pressure relief passage; 11. a third pressure relief passage; 23. a fourth pressure relief passage; 24. a fifth pressure relief passage; 25. a sixth pressure relief passage; 20a, a tube body; 20a1, first end; 20a2, second end; 21a, a one-way vent valve; 22a, a cover; 20b, a cylinder.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

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 and intended to be used for 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 "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example one

Referring to fig. 1 and fig. 2, an embodiment of the flame retardant mechanism 100 for a battery pack according to the present invention is configured to be installed inside a battery pack case 200, and the battery pack case 200 is provided with a pressure relief hole 300, so as to protect the battery pack and to be used with an explosion-proof valve.

The battery pack flame-retardant mechanism 100 comprises a flame-retardant housing 10 and a flow resisting piece 20, wherein the flame-retardant housing 10 is made of a flame-retardant material, and the flow resisting piece 20 is arranged on the inner side of a battery pack box body 200. The choke piece 20 is provided with a first pressure relief channel 21, the flame-retardant housing 10 covers the choke piece 20 and is arranged on the inner side of the battery pack box 200, a second pressure relief channel 22 is formed between the choke piece 20 and the flame-retardant housing 10 in a surrounding manner, a third pressure relief channel 11 is formed on the flame-retardant housing 10, the third pressure relief channel 11, the second pressure relief channel 22, the first pressure relief channel 21 and the pressure relief hole 300 are communicated with each other, and the second pressure relief channel 22 and the first pressure relief channel 21 form a choke channel 30 for prolonging the flowing time of air flow between the third pressure relief channel 11 and the pressure relief hole.

The embodiment of the utility model provides a fire-retardant mechanism of battery package 100, its working process is as follows: high-speed airflow generated by explosion in the battery pack enters the second pressure relief channel 22 and the first pressure relief channel 21 from the third pressure relief channel 11 of the flame-retardant housing 10, and is rapidly discharged to the outside through the pressure relief hole 300 of the battery pack after the guiding action of the first pressure relief channel 21 and the second pressure relief channel 22, so that the internal pressure of the battery pack can be released, the possibility of overall explosion of the battery pack is reduced, meanwhile, the first pressure relief channel 21 and the second pressure relief channel 22 form the flow blocking channel 30, and the external air can be prolonged or blocked to enter the battery pack box body 200, namely, the external air is prevented from directly entering the battery pack, the combustion-supporting explosion process is realized, and thus, flames caused by internal combustion of the battery pack cannot be burnt to the outside of the battery pack.

Specifically, in the present embodiment, the flame-retardant cover case 10 and the choke piece 20 are both fixedly attached to the inner side wall of the battery pack case 200. The open end of the flame retardant housing 10 and the flow resisting element 20 are fixedly connected to the inner side wall of the battery pack case 200 by welding or riveting, and it can be understood that the fixing manner between the flame retardant housing 10 and the inner side wall of the battery pack case 200 is not limited to welding or riveting, and may also be screw, snap, etc., no matter what the fixing manner is, mainly the relative position between the flame retardant housing 10 and the inner side wall of the battery pack case 200 is fixed and no gap is left.

Specifically, referring to fig. 1 and fig. 2, in the present embodiment, the choke 20 includes a tubular body 20a having a hollow structure, the tubular body 20a includes a first end 20a2 and a second end 20a1 opposite to the first end 20a2, and the first end 20a2 of the tubular body surrounds the pressure relief hole 300. A gap is formed between the second end 20a1 of the tube 21a and the flame-retardant housing 10, and a third pressure relief channel 11 is opened on the side wall of the flame-retardant housing 10. It will be appreciated that the wall of the tube 20a and the flame retardant housing 10 enclose a second pressure relief passage 22. Since the first end 20a2 and the second end 20a1 of the tube 20a are in the same direction as the pressure relief hole 300, in order to extend the flow time of the air flow in the choke passage 30, the third pressure relief passage 111 is opened at the side wall of the flame-retardant housing 10.

Example two

Further, referring to fig. 1 and fig. 3, in addition to the first embodiment, the flow blocking element 20 further includes a one-way vent valve 21a, and the one-way vent valve 21a is sleeved at the second end 20a1 of the tube body 20 a. Here, the one-way airing valve 21a may be commercially available, for example, a film or the like having one-way airing, and the airing direction coincides with the air flow direction inside the choke passage 30, so that the outside air can be blocked from entering the choke passage 30 and the inside of the battery pack. With the ground, the one-way vent valve 21a can be fixed at the open end of the tube 20a by means of a threaded connection or a hose clamp.

EXAMPLE III

Further, referring to fig. 1 and fig. 4, on the basis of the second embodiment or the first embodiment, the flow resisting element 20 further includes a cover 22a, the flow resisting element further includes a cover 22a, the cover 22a is disposed between the tube 20a and the flame-retardant housing 10, a fourth pressure relief channel 23 is formed by enclosing the flow resisting element 20 and the flame-retardant housing 10, a fifth pressure relief channel 24 is formed by enclosing the cover 22a and the flame-retardant housing 22a, the fourth pressure relief channel 23 and the fifth pressure relief channel 24 form a second pressure relief channel 22, a sixth pressure relief channel 25 is disposed on an end side of the cover 22a away from the third pressure relief channel 11, and the fourth pressure relief channel 23 is communicated with the fifth pressure relief channel 24 through the sixth pressure relief channel 25. It can be understood that a cover 22a is additionally provided to lengthen the spatial length of the second pressure relief channel 22, that is, the flow blocking channel 30 is composed of the first pressure relief channel 21, the fourth pressure relief channel 23 and the fifth pressure relief channel 24, so as to further prolong the flowing time of the explosive airflow in the flow blocking channel 30, and simultaneously, prevent the one-way vent valve 21a from being directly exposed to the high-speed airflow, and improve the connection stability between the one-way vent valve 21a and the tube body 20 a.

In this embodiment, the size of the inner diameter of the sixth pressure relief channel 25 gradually decreases from the air inlet direction to the air outlet direction. It can be understood that, the inside of the battery pack is burnt or even exploded, and the internal air pressure is suddenly increased, so that the battery pack needs to be rapidly decompressed, and the inner diameter structure of the sixth pressure release channel 25 can shorten the time for the air flow to pass through the sixth pressure release channel 25, so that the air flow inside the battery pack can rapidly flow to the outside.

Example four

Alternatively, referring to fig. 1 and fig. 5, a difference of the above embodiments is that in the present embodiment, the choke element 20 includes a cylinder 20b, an open end of the cylinder 20b corresponds to the pressure relief hole 300 and is fixedly connected to an inner side wall of the battery pack case 200, a third pressure relief channel 11 is formed on a side wall of the flame retardant housing 10, and a first pressure relief channel 21 is formed on an end side of the cylinder 20b away from the third pressure relief channel 11. It can be understood that the outer side wall of the barrel 20b and the inner side wall of the flame retardant housing 10 enclose to form the second pressure relief channel 22, and similarly, the distance between the second pressure relief channel 22 and the third pressure relief channel 11 is increased, so as to further increase the spatial length of the flow blocking channel 30, and further extend the flowing time of the external air into the battery pack case.

EXAMPLE five

Alternatively, referring to fig. 1 and fig. 6, the difference from the fourth embodiment is that the opening positions of the first pressure relief channel 21 and the third pressure relief channel 11 are different. Specifically, a third pressure relief channel 11 is opened at an end side of the flame-retardant housing 10 away from the pressure relief hole, that is, a top end portion, and a second vent structure 22b is opened at a side wall of the cylinder 20 b. The distance between the two is also long, and the space length of the choke passage 30 is also extended.

Similarly, in the fourth and fifth embodiments, the size of the inner diameter of the first pressure release channel 21 decreases gradually from the air inlet direction to the air outlet direction. The internal diameter structure of the first pressure release channel 21 can shorten the time of the air flow passing through the first pressure release channel 21, and further, the air flow inside the battery pack can flow to the outside quickly.

Similarly, in the first to fifth embodiments, the inner diameter of the third pressure release channel 11 decreases from the air inlet direction to the air outlet direction. The above-mentioned hole internal diameter structure of third pressure release channel 11 can shorten the time of the air current through third pressure release channel 11, and then, the inside air current of battery package can flow to the outside fast.

The utility model also provides a battery package, including above-mentioned battery package fire-retardant mechanism 100.

Referring to fig. 1 and fig. 2, in the present embodiment, the battery pack of the present invention further includes an explosion-proof valve 400, wherein the explosion-proof valve 400 is installed on an outer sidewall of the battery pack case 200 and is blocked at the pressure relief hole 300. Thus, the explosion-proof valve 400 effectively isolates the outside air, and the explosion-proof flame-retardant effect can be further improved.

With the battery pack flame-retardant mechanism 100, the battery pack is safer to use, and the outside of the battery pack is less prone to burning.

It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced with equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a fire-retardant mechanism of battery package for install the inboard at battery package box, the pressure release hole has been seted up on the battery package box, its characterized in that: including fire-retardant housing and set up in the choked flow piece of the inboard of battery package box, the choked flow piece has first pressure release passageway, fire-retardant housing cover is established the choked flow piece just locates the inboard of battery package box, the choked flow piece with enclose between the fire-retardant housing and close and form second pressure release passageway, third pressure release passageway has been seted up on the fire-retardant housing, third pressure release passageway second pressure release passageway first pressure release passageway with the pressure release hole communicates each other, second pressure release passageway with first pressure release passageway forms and is used for the extension air current third pressure release passageway with the choked flow passageway of flow time between the pressure release hole.

2. The battery pack fire retarding mechanism of claim 1, wherein: the flame-retardant housing and the flow resisting piece are both fixedly connected to the inner side wall of the battery pack box body.

3. The battery pack fire retarding mechanism of claim 1, wherein: the flow resisting part comprises a pipe body which is of a hollow structure, the pipe body comprises a first end and a second end opposite to the first end, the first end of the pipe body is enclosed in the pressure relief hole, a gap is formed between the second end of the pipe body and the flame-retardant housing, and the side wall of the flame-retardant housing is provided with a third pressure relief channel.

4. The battery pack fire retarding mechanism of claim 3, wherein: the flow blocking piece further comprises a one-way vent valve, and the second end of the pipe body is sleeved with the one-way vent valve.

5. The battery pack fire retardant mechanism of claim 3 or 4, wherein: the flow resisting part further comprises a cover, the cover is arranged between the pipe body and the flame-retardant housing, the flow resisting part and the flame-retardant housing are enclosed to form a fourth pressure relief channel, the cover and the flame-retardant housing cover are enclosed to form a fifth pressure relief channel, the fourth pressure relief channel and the fifth pressure relief channel form the second pressure relief channel, the cover is far away from the end side of the third pressure relief channel, a sixth pressure relief channel is arranged, and the fourth pressure relief channel is communicated with the fifth pressure relief channel.

6. The battery pack fire retarding mechanism of claim 5, wherein: the opening end of the cover casing is fixedly connected with the inner side wall of the battery pack box body.

7. The battery pack fire retarding mechanism of claim 5, wherein: the size of the inner diameter of the sixth pressure relief channel gradually decreases from the air inlet direction to the air outlet direction.

8. The battery pack fire retarding mechanism of claim 1, wherein: the flow resisting part comprises a barrel body, the opening end of the barrel body is surrounded with the pressure relief hole and is fixedly connected to the inner side wall of the battery pack box body, the third pressure relief channel is formed in the side wall of the flame-retardant housing, and the first pressure relief channel is formed in the end side of the barrel body far away from the third pressure relief channel.

9. The battery pack fire retarding mechanism of claim 1, wherein: the flow resisting part comprises a barrel body, the opening end of the barrel body is surrounded with the pressure relief hole and is fixedly connected to the inner side wall of the battery pack box body, the flame-retardant housing is far away from the end side of the pressure relief hole, the third pressure relief channel is arranged, and the first pressure relief channel is arranged on the side wall of the barrel body.

10. The battery pack fire retardant mechanism of claim 8 or 9, wherein: the size of the inner diameter of the first pressure relief channel is gradually reduced from the air inlet direction to the air outlet direction.

11. The battery pack fire retardant mechanism of any one of claims 1 to 3, wherein: the inner diameter of the third pressure relief channel gradually decreases from the air inlet direction to the air outlet direction.

12. A battery pack, comprising: including a battery pack fire retardant mechanism as claimed in any one of claims 1 to 11.

13. The battery pack according to claim 12, wherein: the battery pack box further comprises an explosion-proof valve, wherein the explosion-proof valve is installed on the outer side of the battery pack box body and blocks the pressure relief hole.