CN215816098U - Battery pack thermal runaway protection system and battery pack - Google Patents
Battery pack thermal runaway protection system and battery pack Download PDFInfo
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- CN215816098U CN215816098U CN202121250800.0U CN202121250800U CN215816098U CN 215816098 U CN215816098 U CN 215816098U CN 202121250800 U CN202121250800 U CN 202121250800U CN 215816098 U CN215816098 U CN 215816098U
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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
Abstract
The utility model is suitable for the technical field of batteries, and provides a battery pack thermal runaway protection system and a battery pack, which comprise a battery pack box body provided with a box body inner cavity, wherein a beam body is arranged in the box body inner cavity, and divides the box body inner cavity into a plurality of accommodating cavities for accommodating battery modules; a pressure relief channel is arranged in at least one side plate of the box body, and the side plate is provided with an explosion-proof valve communicated with the pressure relief channel; the inside of the roof beam body is provided with the first direction passageway with the pressure release passageway intercommunication, and the roof beam body is provided with the air inlet with first direction passageway intercommunication towards the lateral wall in holding chamber, and air inlet department is provided with first one-way conduction valve, and first one-way conduction valve is used for opening when pressure is greater than first predetermined threshold value, and the gas that the thermal runaway produced flows to the pressure release passageway along first direction passageway. The battery pack thermal runaway protection system is provided with a first guide channel in the beam body so as to guide gas to a pressure relief channel and discharge the gas through an explosion-proof valve, the structure is compact, and the thermal runaway protection effect is improved.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery pack thermal runaway protection system and a battery pack.
Background
The development of the current high-tech industry is rapid, the energy density of the single body of the power lithium battery for the vehicle is continuously improved, the grouping rate of the battery modules is greatly improved due to the cruising demand of the market, and the heat generated inside the battery is increased more and more when the vehicle runs.
The thermal runaway protection of the current battery pack cannot meet the internal pressure release of the battery pack, and the design of the battery pack in the prior art tends to mainly use the internal space of the battery pack for battery arrangement so as to be superior to the electric quantity to the maximum extent and realize the requirement of the maximum driving mileage of the whole vehicle. Therefore, the space in the battery pack except the battery is small, when the battery core is out of thermal runaway, the space in the battery pack is limited, a large amount of gas is inconvenient to flow out, and the pressure in the battery pack is increased after the gas is accumulated in the battery pack, so that the battery pack is easy to explode.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a thermal runaway protection system for a battery pack, and aims to solve the technical problem that an explosion phenomenon is easy to occur during thermal runaway because the internal space of the battery pack is small and the pressure of gas is difficult to release in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that: the battery pack thermal runaway protection system comprises a box body, wherein the box body is provided with a box body inner cavity, a beam body is arranged in the box body inner cavity, and the beam body divides the box body inner cavity into a plurality of accommodating cavities for accommodating battery modules; a pressure relief channel is arranged inside at least one side plate of the box body, and the side plate is provided with an explosion-proof valve communicated with the pressure relief channel; the inside of roof beam body is provided with first direction passageway, first direction passageway with pressure release channel intercommunication, the roof beam body orientation the lateral wall in holding chamber be provided with the air inlet of first direction passageway intercommunication, air inlet department is provided with first one-way conduction valve, first one-way conduction valve is used for opening when pressure is greater than first predetermined threshold value, and the gas that the thermal runaway produced along first direction passageway flow direction pressure release channel.
Through adopting above-mentioned scheme, be applied to the battery package with battery package thermal runaway protection system in the battery package, when the battery package takes place the thermal runaway phenomenon, the gaseous of battery module department production is collected to first one-way conduction valve by the box inner chamber, and first one-way conduction valve opens when pressure is greater than first predetermined threshold value, and gaseous entering first guide way to get into pressure release channel along first guide way, finally via explosion-proof valve discharge to the battery package outside. Because the pressure release passageway is located the inside of the curb plate of battery package box, first direction passageway is located the roof beam internal portion, has consequently utilized the internal original structure of battery package box, and is less to the inner space influence of battery package box, can not further reduce battery package box inner space, and makes the battery package at the gaseous quick discharge that the initial stage produced of thermal runaway, avoids gaseous battery package explosion that arouses to a certain extent.
In one embodiment, the first one-way conduction valve includes a baffle plate, the baffle plate covers the air inlet, and the baffle plate is configured to swing around a vertical axis to the inner side of the first guide channel when the pressure is greater than the first preset threshold value, so as to guide the air in the accommodating cavity to a direction close to the pressure relief channel.
By adopting the scheme, after the baffle swings, the baffle inclines relative to the extending direction of the first guide channel, so that the gas entering the first guide channel is convenient to turn and move along the extending direction of the first guide channel.
In one embodiment, the baffle includes a first side surface located in the first guide channel and a second side surface opposite to the first side surface, a first abutting portion is arranged at one end, close to the pressure relief channel, of the first side surface, a second abutting portion is arranged at one end, far away from the pressure relief channel, of the second side surface, the first abutting portion abuts against the inner wall of the beam body, and the second abutting portion abuts against the outer wall of the beam body.
Through adopting above-mentioned scheme for the baffle is after the swing, is close to the direction of pressure release passageway with the direction of gas direction, is convenient for improve the speed of gaseous discharge battery package.
In one embodiment, the battery pack thermal runaway protection system further comprises a limiting structure mounted on the inner wall of the first guide channel, and the limiting structure is used for limiting the swing range of the baffle to be not more than 90 °.
Through adopting above-mentioned scheme, inject the swing range of baffle through limit structure to the direction of control baffle to gas.
In one embodiment, the beam body comprises a transverse beam and a longitudinal beam which are arranged crosswise, the box body comprises two first side plates which are arranged oppositely and two second side plates which are arranged oppositely, two ends of the transverse beam are connected with the two second side plates respectively, and two ends of the longitudinal beam are connected with the two first side plates respectively;
the pressure relief channel is arranged on at least one first side plate, and the first guide channel is arranged on the longitudinal beam; or
The pressure relief channel is arranged on at least one of the second side plates, and the first guide channel is arranged on the cross beam.
By adopting the scheme, the turning times of the gas entering the first guide channel in the first guide channel and the pressure relief channel can be reduced, so that the moving speed of the gas is improved, and the gas is discharged more quickly.
In one embodiment, when the pressure relief channel is arranged on the first side plate, each second side plate is provided with a second guide channel and a second one-way conduction valve communicated with the second guide channel; when the pressure relief channel is arranged on the second side plate, each first side plate is provided with a second guide channel communicated with the pressure relief channel and a second one-way conduction valve communicated with the second guide channel; the second guide channel is communicated with the pressure relief channel, the second one-way conduction valve is used for being opened when the pressure is larger than a first preset threshold value, and gas generated by thermal runaway flows to the pressure relief channel along the second guide channel.
Through adopting above-mentioned scheme, be provided with second guide channel in the curb plate inboard of box for the gas in the holding intracavity can enough get into the pressure release passageway through the internal first guide channel of roof beam, also can get into the pressure release passageway through the second guide channel in the box curb plate, thereby improves gas discharge efficiency.
In one embodiment, the battery pack thermal runaway protection system further comprises a battery module, wherein the battery module is provided with an exhaust valve, and the exhaust valve is arranged opposite to the air inlet.
Through adopting above-mentioned scheme, discharge valve is convenient for discharge the gas in the battery module sooner to make gas get into first direction passageway via first one-way conduction valve sooner.
In one embodiment, the lateral wall of battery module includes the end plate and sets up the PLASTIC LAMINATED in the end plate outside, the end plate is provided with first exhaust hole, the PLASTIC LAMINATED is provided with the second exhaust hole, discharge valve includes the shutoff portion and the connecting portion that are located in the second exhaust hole, the shutoff portion pass through connecting portion connect in the inner wall in second exhaust hole, the shutoff portion lid is located first exhaust hole, connecting portion are configured to fracture when first exhaust hole discharged gas pressure is greater than the second and predetermine the threshold value.
Through adopting above-mentioned scheme, discharge valve sets up in the end plate and PLASTIC LAMINATED department of battery module, simple structure, and occupation space is little for battery module compact structure.
In one embodiment, the battery module further comprises a battery core, an insulating member is arranged between the battery core and the end plate, the insulating member comprises a body and a protruding portion connected with the body, a first gap is formed between the body and the end plate, and the protruding portion is provided with an exhaust passage communicated with the first exhaust hole.
By adopting the scheme, the gas generated at the battery core is guided to the first exhaust hole through the exhaust channel in the protruding part of the insulating piece.
An object of an embodiment of the present invention is to provide a battery pack, where the battery pack is provided with the battery pack thermal runaway protection system according to any one of the above technical solutions.
Through adopting above-mentioned scheme, the compact structure and the thermal runaway protective capacities of battery package have the promotion of certain degree.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic perspective view of a battery pack thermal runaway protection system provided by one embodiment of the utility model;
fig. 2 is a schematic perspective view of a battery pack case in the battery pack thermal runaway protection system according to an embodiment of the utility model;
fig. 3 is a top view of the battery pack case of fig. 2;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a partial enlarged view at B in FIG. 4;
FIG. 6 is an enlarged view of a portion of FIG. 4 at C;
FIG. 7 is a schematic structural view of a first one-way conduction valve in a closed state according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of a first one-way conduction valve in a closed state according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of a stringer provided in accordance with an embodiment of the present invention;
FIG. 10 is a schematic structural view of a first one-way conduction valve provided in accordance with an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a battery module according to an embodiment of the present invention;
FIG. 12 is a schematic view of the structure of FIG. 11 at D;
fig. 13 is a schematic view of the structure at E in fig. 11.
Reference numerals referred to in the above figures are detailed below:
1-a beam body; 11-a cross beam; 12-a stringer; 13-a first guide channel; 14-an air inlet; 15-a limit structure;
2-side plate; 21-a first side panel; 22-a second side panel; 23-a pressure relief channel; 24-an explosion-proof valve; 25-a second one-way conduction valve;
3-a first one-way conduction valve; 31-a baffle; 311-a first side; 312 — a second side; 32-a first abutment; 33-a second abutment;
4-a battery module; 41-end plate; 411-first vent; 412-a support cylinder; 42-fire protection plate; 421-second vent; 43-an exhaust valve; 431-a blocking part; 432-a connecting portion; 44-an insulator; 441-boss.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The following describes a specific implementation of the present invention in more detail with reference to specific embodiments.
As shown in fig. 1 to 4, an embodiment of the present invention provides a battery pack thermal runaway protection system, which includes a battery pack box body, the battery pack box body is provided with a box body inner cavity, a beam body 1 is installed in the box body inner cavity, and the beam body 1 divides the box body inner cavity into a plurality of accommodating cavities for accommodating battery modules 4; a pressure relief channel 23 is arranged in at least one side plate 2 of the box body, and an explosion-proof valve 24 is arranged at the intersection part of the pressure relief channel 23 and the side plate; the inside of roof beam body 1 is provided with first guide way 13, first guide way 13 and pressure release channel 23 intercommunication, the lateral wall of roof beam body 1 towards the holding chamber is provided with air inlet 14, refer to fig. 8 and 9, air inlet 14 department is provided with first one-way conduction valve 3, first one-way conduction valve 3 is used for opening when pressure is greater than first predetermined threshold value to make the gaseous first guide way 13 of entering of battery module 4 thermal runaway production in the holding chamber, and flow to pressure release channel 23 along first guide way 13.
Specifically, when the battery pack is in a normal working state, the pressure of the accommodating cavity is P1, and when a thermal runaway state occurs in the battery pack, the pressure of the accommodating cavity in which the thermal runaway cell is located is increased to P2. The effective area of the first one-way conduction valve 3 is S1 (the effective area of the first one-way conduction valve 3 is the area that the first one-way conduction valve 3 can contact with the gas in the accommodating cavity), then the first preset threshold F1 of the first one-way conduction valve 3 needs to satisfy: p1 < F1 is not less than P2S 1. In the range, the first one-way conduction valve 3 is in a closed state when the battery pack is normally in a working state, and when the battery pack is out of control due to heat, the first one-way conduction valve 3 is opened in the process that the pressure of the accommodating cavity is gradually increased.
The battery package thermal runaway protection system that this embodiment provided is applied to the battery package, battery module 4 has been placed in the holding intracavity that the battery package is the same, when the electric core in the battery module 4 takes place the thermal runaway phenomenon, the high-pressure gas gathering in the box inner chamber of production, thereby make the atmospheric pressure in the box inner chamber rise, rise to being greater than when first predetermined threshold value at atmospheric pressure, first one-way conduction valve 3 opens, gas passes first one-way conduction valve 3 and gets into first guide way 13, and move to the direction that is close to pressure release way 23 under the drainage effect of first one-way conduction valve 3. Since the first guide channel 13 is communicated with the pressure relief channel 23, the gas moves along the first guide channel 13 to the pressure relief channel 23 and is finally discharged to the outside of the battery pack case by the explosion-proof valve 24 of the pressure relief channel 23, so as to reduce the pressure inside the battery pack case.
Because first direction passageway 13 is located the roof beam body 1 inside, pressure release channel 23 is located the inside of the curb plate 2 of box, has consequently utilized the internal original structure of battery package box, and is less to the inner space influence of battery package box, can not further reduce battery package box inner space, and makes the battery package discharge fast at the gas that the initial stage of thermal runaway produced, avoids gaseous battery package explosion that arouses to a certain extent.
In one embodiment, the beam body 1 comprises a transverse beam 11 and a longitudinal beam 12 which are arranged crosswise, the box body comprises two first side plates 21 which are arranged oppositely and two second side plates 22 which are arranged oppositely, the first side plates 21 are arranged in parallel with the transverse beam 11, and the second side plates 22 are arranged in parallel with the longitudinal beam 12;
as shown in fig. 2 and 3, the box body includes two first side plates 21 and two second side plates 22, the two first side plates 21 are disposed opposite to each other, and the two second side plates 22 are disposed opposite to each other. Two ends of the cross beam 11 are respectively connected with two second side plates 22, and two ends of the longitudinal beam 12 are respectively connected with two first side plates 21. The cross beam 11 is parallel to the first side plate 21 and the longitudinal beam 12 is parallel to the second side plate 22.
The pressure relief passage 23 may be provided in the first side plate 21 or the second side plate 22. The first guide channel 13 may be provided in the cross member 11 or in the side member 12.
In the two first side plates 21, the pressure release channel 23 may be provided in only one of the first side plates 21, or the pressure release channels 23 may be provided in each of the two first side plates 21.
When the pressure relief channel 23 is provided in the first side plate 21, preferably, the first guide channel 13 is provided in the side member 12. With the arrangement, no matter the number of the longitudinal beams 12 is one or more, the air entering the first guide channel 13 in any longitudinal beam 12 flows linearly in the first guide channel 13 and then directly enters the pressure relief channel 23, so that the moving speed of the air in the first guide channel 13 is increased, and the air exhaust speed is increased.
When the pressure relief channel 23 is provided in the second side plate 22, preferably, the first guide channel 13 is provided in the cross member 11. So set up, no matter the quantity of crossbeam 11 is one or a plurality of, the gas that gets into in the first guide way 13 in arbitrary crossbeam 11 all can directly get into pressure release channel 23 along the straight line flow in first guide way 13, improves the moving speed of gas at first guide way 13 to improve the speed that the gas was discharged.
Specifically, the battery pack box body comprises an upper box body and a lower box body, and the first guide channel 13 and the pressure relief channel 23 can be arranged on the upper box body and can also be arranged on the lower box body. In fig. 1 and 2, the first guide channel 13 and the pressure relief channel 23 are both arranged on the lower box body, the protection plate is a bottom plate of the lower box body, and the cross beam 11 and the longitudinal beam 12 are both connected with the bottom plate.
In one embodiment, when the pressure relief channel 23 is disposed on the first side plate 21, each second side plate 22 is disposed with a second guiding channel and a second one-way conducting valve 25, the second one-way conducting valve 25 is disposed on the first side plate 21 and is in conduction with the second guiding channel, and the second guiding channel is communicated with the pressure relief channel 23; when the pressure relief channel 23 is disposed on the second side plate 22, each first side plate 21 is provided with a second guiding channel and a second one-way conduction valve 25, the second one-way conduction valve 25 is disposed on the second side plate 22 and is conducted with the second guiding channel, and the second guiding channel is communicated with the pressure relief channel 23. The second one-way conduction valve 25 has the same structure as the first one-way conduction valve 3, and is used for opening when the pressure is greater than a first preset threshold value, so that the gas generated by thermal runaway enters the second guide channel, and the second one-way conduction valve 25 plays a role in guiding the gas, so that the gas flows to the pressure relief channel 23 along the second guide channel.
Through adopting above-mentioned scheme, 2 inboards at the curb plate of box are provided with the second guide way that the gas that is used for the thermal runaway to pressure release channel 23 flow, the cracking pressure of second one-way conduction valve 25 is the same with the cracking pressure of first one-way conduction valve, be first predetermined threshold value, consequently make the gaseous first guide way 13 that can enough pass through in the roof beam body 1 of holding intracavity get into pressure release channel 23, also can get into pressure release channel 23 through the second guide way in the box curb plate 2, thereby improve gas discharge efficiency.
For example, as shown in fig. 2, in the battery pack case, a pressure relief passage 23 is provided inside one of the first side plates 21, and an explosion-proof valve 24 is provided on the first side plate 21. A second guide passage and a second one-way conduction valve 25 are provided in the interior of the side member 12 and in the interior of the two second side plates 22. So set up, utilize the original structure of battery package, increased the quantity of the direction passageway that communicates with pressure release channel 23 (i.e. first direction passageway 13 and the total amount of second direction passageway), increase the total amount with battery module 4 relative first one-way conduction valve 3 and second one-way conduction valve 25, thereby make the gas that produces in the battery module 4 can be discharged from more nearer first one-way conduction valve 3 or second one-way conduction valve 25 of distance, with the speed that improves gaseous entering first direction passageway 13 or second direction passageway, reduce the time that gaseous stops the accumulation in the box inside.
In one possible embodiment, the second one-way conduction valve 25 and the first one-way conduction valve 3 may have the same structure, and the specific structure of the first one-way conduction valve 3 is described as an example below.
The first one-way conduction valve 3 may be a weak area on the beam body 1, the thickness of the weak area is smaller than that of the beam body 1, and after the pressure is greater than a first preset threshold, the weak area is broken to expose the gas inlet 14, so that the gas can enter the first guide passage 13.
Alternatively, in a preferred embodiment, as shown in fig. 5 to 9, the first one-way conduction valve 3 includes a baffle 31, the baffle 31 covers the air inlet 14, and the baffle 31 is configured to swing around a vertical axis toward the inner side of the first guide channel 13 when the pressure is greater than the first preset threshold, so that the baffle 31 guides the air exhausted from the accommodating chamber, and the air in the accommodating chamber flows along the first guide channel 13 to the pressure relief channel 23. When the thermal runaway protection system of the battery pack is applied to the battery pack and the battery pack is in a normal use state, the first guide channel 13 and the pressure relief channel 23 both extend along the horizontal direction. And the flap 31 swings about a vertical axis, i.e. in a horizontal plane, changing the direction in which the gas moves along the horizontal plane.
By adopting the above-mentioned scheme, after the baffle 31 swings, the baffle 31 is inclined relative to the extending direction of the first guide channel 13, so that the gas entering the first guide channel 13 is deflected and moves along the extending direction of the first guide channel 13, and the baffle 31 plays a guiding auxiliary role of deflecting the gas, so that the gas is converted from the direction substantially perpendicular to the gas inlet 14 to move along the extending direction of the first guide channel 13.
As shown in fig. 3, when the pressure relief channel 23 is provided in one of the first side plates 21, the longitudinal beam 12 and the two second side plates 22, the first guide channel 13 is provided in each of them, and the gas flow direction in the battery box is the direction indicated by the cusp.
As shown in fig. 4-8 and 10, in order to control the swing direction of the flap 31 during swing, the flap 31 includes a first side surface 311 located in the first guide channel 13 and a second side surface 312 opposite to the first side surface 311, a first abutting portion 32 is disposed at one end of the first side surface 311 close to the pressure relief channel 23, a second abutting portion 33 is disposed at one end of the second side surface 312 far from the pressure relief channel 23, the first abutting portion 32 abuts against the inner wall of the beam 1, and the second abutting portion 33 abuts against the outer wall of the beam 1. In the structure of the baffle 31, the thickness of the second abutting portion 33 in the baffle 31, the material of the second abutting portion 33, and the area of the side surface of the baffle 31 facing the inside of the accommodating chamber are all related to the pressure required for opening the baffle 31, that is, the pressure required for opening the first one-way conduction valve 3, and the pressure required for opening the first one-way conduction valve 3 can be changed by changing the above factors so that the pressure for opening the first one-way conduction valve 3 is the first preset threshold.
After the thermal runaway phenomenon occurs in the battery module 4, the gas impacts the second side 312 of the baffle 31, and the second side 312 abuts against the beam 1 through the second abutting portion 33, so that the side of the baffle 31 close to the pressure relief channel 23 swings to the inner side of the first guide channel 13, and the baffle 31 is inclined relative to the side wall of the beam 1 and is inclined from the position close to the air inlet 14 to the direction close to the pressure relief channel 23. As shown in fig. 7 and 8, since the left side in the drawing direction is the direction of the pressure release path 23, the second abutment portion 33 is provided on the right side of the shutter 31, and the first abutment portion 32 is provided on the left side of the shutter 31. After the gas impacts the baffle 31, as shown in fig. 8, the second abutting portion 33 of the baffle 31 is bent, the first abutting portion 32 is separated from the beam 1, and the baffle 31 swings towards the inner side of the first guide channel 13, so that an inclined plane gradually inclined to the left from the gas inlet 14 to the inner side of the first guide channel 13 is formed, and thus an inclined leftward guiding effect is provided for the gas entering the first guide channel 13, so that the gas entering the gas inlet 14 moves obliquely leftward, and finally, the gas moves leftward, and moves into the pressure relief channel 23 more quickly.
Preferably, the battery pack thermal runaway protection system further comprises a limiting structure 15, the limiting structure 15 is mounted on the inner wall of the first guide channel 13, and the limiting structure 15 is used for limiting the swing range of the baffle 31 to be not more than 90 °.
By adopting the scheme, the swinging range of the baffle plate 31 is limited by the limiting structure 15, so that the guiding direction of the baffle plate 31 to the gas is controlled.
The limiting structure 15 may be a protrusion installed on the first side 311 of the baffle 31, and after the baffle 31 swings, the protrusion abuts against the inner wall of the beam body 1, so that the baffle 31 stops swinging.
In another embodiment, as shown in fig. 4 and 5, the position limiting structure 15 is installed inside the girder 1 and connected to the girder 1. After the flap 31 swings, the first side surface 311 of the flap 31 abuts against the stopper structure 15, and the swing is stopped.
As shown in fig. 4 and 9, the limiting structure 15 is a plate-shaped structure, the limiting structure 15 extends along the extending direction of the beam body 1, two sides of the baffle 31 are respectively connected with two opposite side walls of the beam body 1, and thus, the limiting structure 15 plays a role in limiting and simultaneously also plays a role in reinforcing the structural strength of the beam body 1.
As shown in fig. 11 to 13, in one embodiment, the thermal runaway prevention system for a battery pack further includes a battery module 4, and the battery module 4 is provided with an exhaust valve 43, and the exhaust valve 43 is disposed opposite to the air inlet 14.
By adopting the above-described scheme, the exhaust valve 43 facilitates discharging the gas in the battery module 4 more quickly, so that the gas enters the first guide passage 13 via the first one-way conduction valve 3 more quickly.
When the second guide passage and the second one-way conduction valve 25 are provided in the side plate 2, the number of the exhaust valves 43 is plural, part of the exhaust valves 43 are arranged opposite to the first one-way conduction valve 3 at the air inlet 14 of the beam body 1, and part of the exhaust valves 43 are arranged opposite to the second one-way conduction valve 25 on the side plate.
It is preferable that the exhaust valves 43 be provided at least two side walls of the battery module 4, respectively, and the number of the exhaust valves 43 on each side wall be plural.
In one embodiment, the side wall of the battery module 4 includes an end plate 41 and a fireproof plate 42 disposed outside the end plate 41, the end plate 41 is provided with a first vent hole 411, the fireproof plate 42 is provided with a second vent hole 421, the vent valve 43 includes a blocking portion 431 located in the second vent hole 421 and a connecting portion 432, the blocking portion 431 is connected to an inner wall of the second vent hole 421 through the connecting portion 432, the blocking portion 431 covers the first vent hole 411, and the connecting portion 432 is configured to break when the pressure of the gas exhausted from the first vent hole 411 is greater than a second preset threshold value.
Specifically, when the internal pressure of the battery module 4 is P3 in the normal operating state of the battery module 4, the internal pressure of the battery module 4 rises to P4 when thermal runaway of the battery module 4 occurs. If the effective area of the blocking portion 431 is S2 (the effective area of the blocking portion 431 is the area of the blocking portion 431 corresponding to the first exhaust hole 411), the second preset threshold F2 of the blocking portion 431 should satisfy: p3 < F2 is not less than P4S 2. In this range, the blocking part 431 is in the closed state when the battery module 4 is in the normal operation state, and when thermal runaway occurs in the battery module 4 and the pressure inside the battery module 4 gradually increases, the connection part 432 to which the blocking part 431 is connected is broken, so that the blocking part 431 is not away from the first vent hole 421, that is, the vent valve 43 is opened, and gas is discharged through the outside of the battery module 4 through the first vent hole 411.
Through adopting above-mentioned scheme, discharge valve 43 sets up in the end plate 41 and the PLASTIC LAMINATED 42 department of battery module 4, simple structure, and occupation space is little for battery module 4 compact structure.
The inside of battery module 4 is provided with electric core, preferably, is provided with end plate 41 respectively at the outside both ends of electric core, all is provided with PLASTIC LAMINATED 42 in the one side that electric core was kept away from to every end plate 41. The fire shield 42 is made of a fire resistant material or alternatively, the surface of the fire shield 42 is coated with a fire retardant coating to form a fire retardant coating. The setting of PLASTIC LAMINATED 42 can play better guard action to electric core, avoids getting into first guide way 13's gaseous palirrhea.
In one embodiment, an insulating member 44 is disposed between the battery cell and the end plate 41, the insulating member 44 includes a body and a protruding portion 441 connected to the body, a first gap is formed between the body and the end plate 41, and the protruding portion 441 is provided with an exhaust channel communicated with the first exhaust hole 411. The insulator 44 may be made of plastic. The insulating member 44 serves to insulate between the cell and the end plate 41. If the battery cell is in thermal runaway, gas generated by the battery cell enters the first exhaust hole 411 through the exhaust channel of the protruding portion 441 to reach the exhaust valve 43. That is, the gas generated at the cell is guided to the first gas exhaust hole 411 through the gas exhaust channel in the protruding portion 441 of the insulating member 44, so that the gas exhaust valve 43 is opened.
For better supporting and fixing of the insulating element 44, a supporting cylinder 412 is provided on the side of the end plate 41 remote from the fire protection plate 42, the supporting cylinder 412 is used for supporting a protruding part 441, and the protruding part 441 is inserted into the supporting cylinder 412.
In a preferred embodiment, the battery module 4 is provided with an exhaust valve 43 corresponding to one first one-way conduction valve 3 and an exhaust valve 43 corresponding to one second one-way conduction valve 25.
By adopting the above scheme, the exhaust valve 43 is arranged opposite to the first one-way conduction valve 3 or the second one-way conduction valve 25, so that the gas exhausted by the exhaust valve 43 can enter the first guide channel 13 by the first one-way conduction valve 3 or enter the second guide channel by the second one-way conduction valve 25 more quickly. That is, the gas exhausted through the exhaust valve 43 continues forward along the original moving direction, and reaches the first one-way conduction valve 3 or the second one-way conduction valve 25, so as to enter the first guide channel 13 through the first one-way conduction valve 3 or enter the second guide channel through the second one-way conduction valve 25. So that the gas discharged from the battery module 4 reaches the first guide passage 13 or the second guide passage via the shortest stroke to discharge the gas more quickly.
The embodiment of the utility model also aims to provide a battery pack, and the battery pack is provided with the battery pack thermal runaway protection system in any one of the technical schemes.
Through adopting above-mentioned scheme, the compact structure and the thermal runaway protective capacities of battery package have the promotion of certain degree.
The utility model is not to be considered as limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A battery pack thermal runaway protection system comprises a box body, wherein the box body is provided with a box body inner cavity, a beam body is arranged in the box body inner cavity, and the beam body divides the box body inner cavity into a plurality of accommodating cavities for accommodating battery modules; the anti-explosion box is characterized in that a pressure relief channel is arranged inside at least one side plate of the box body, and the side plate is provided with an anti-explosion valve communicated with the pressure relief channel; the inside of roof beam body is provided with first direction passageway, first direction passageway with pressure release channel intercommunication, the roof beam body orientation the lateral wall in holding chamber be provided with the air inlet of first direction passageway intercommunication, air inlet department is provided with first one-way conduction valve, first one-way conduction valve is used for opening when pressure is greater than first predetermined threshold value, and the gas that the thermal runaway produced along first direction passageway flow direction pressure release channel.
2. The system of claim 1, wherein the first one-way conduction valve comprises a baffle covering the air inlet, and the baffle is configured to swing about a vertical axis toward an inner side of the first guide channel when subjected to a pressure greater than the first predetermined threshold, and the gas in the receiving cavity flows along the first guide channel toward the pressure relief channel.
3. The battery pack thermal runaway protection system of claim 2, wherein the baffle comprises a first side surface located in the first guide channel and a second side surface opposite to the first side surface, a first abutting portion is arranged at one end, close to the pressure relief channel, of the first side surface, a second abutting portion is arranged at one end, far away from the pressure relief channel, of the second side surface, the first abutting portion abuts against the inner wall of the beam body, and the second abutting portion abuts against the outer wall of the beam body.
4. The battery pack thermal runaway protection system of claim 3, further comprising a limiting structure mounted to an inner wall of the first guide channel, the limiting structure configured to limit a range of swing of the baffle to no greater than 90 °.
5. The battery pack thermal runaway protection system of claim 1, wherein the beam body comprises a cross beam and a longitudinal beam which are arranged crosswise, the battery pack box comprises two first side plates which are arranged opposite to each other and two second side plates which are arranged opposite to each other, two ends of the cross beam are respectively connected with the two second side plates, and two ends of the longitudinal beam are respectively connected with the two first side plates;
the pressure relief channel is arranged on at least one first side plate, and the first guide channel is arranged on the longitudinal beam; or
The pressure relief channel is arranged on at least one of the second side plates, and the first guide channel is arranged on the cross beam.
6. The system of claim 5, wherein when the pressure relief channel is disposed on the first side plate, each of the second side plates is provided with a second guide channel and a second one-way conduction valve in communication with the second guide channel; when the pressure relief channel is arranged on the second side plate, each first side plate is provided with a second guide channel communicated with the pressure relief channel and a second one-way conduction valve communicated with the second guide channel; the second guide channel is communicated with the pressure relief channel, the second one-way conduction valve is used for being opened when the pressure is larger than a first preset threshold value, and gas generated by thermal runaway flows to the pressure relief channel along the second guide channel.
7. The battery pack thermal runaway protection system of any one of claims 1-6, further comprising a battery module, the battery module being provided with an exhaust valve disposed opposite the air inlet.
8. The battery pack thermal runaway protection system of claim 7, wherein the battery module comprises an end plate and a fireproof plate arranged outside the end plate, the end plate is provided with a first vent hole, the fireproof plate is provided with a second vent hole, the vent valve comprises a blocking portion and a connecting portion, the blocking portion is located in the second vent hole, the blocking portion is connected to an inner wall of the second vent hole through the connecting portion, the blocking portion covers the first vent hole, and the connecting portion is configured to break when the pressure of gas exhausted from the first vent hole is greater than a second preset threshold value.
9. The battery pack thermal runaway protection system of claim 8, wherein the battery module further comprises a cell, an insulator is disposed between the cell and the end plate, the insulator comprises a body and a boss connected to the body, a first gap is formed between the body and the end plate, and the boss is provided with an exhaust channel communicated with the first exhaust hole.
10. A battery pack, characterized in that the battery pack is provided with a battery pack thermal runaway prevention system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121250800.0U CN215816098U (en) | 2021-06-04 | 2021-06-04 | Battery pack thermal runaway protection system and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121250800.0U CN215816098U (en) | 2021-06-04 | 2021-06-04 | Battery pack thermal runaway protection system and battery pack |
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| Publication Number | Publication Date |
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| CN215816098U true CN215816098U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121250800.0U Active CN215816098U (en) | 2021-06-04 | 2021-06-04 | Battery pack thermal runaway protection system and battery pack |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000611A (en) * | 2022-05-06 | 2022-09-02 | 摩登汽车有限公司 | Power battery assembly |
| WO2023202024A1 (en) * | 2022-04-20 | 2023-10-26 | 湖北亿纬动力有限公司 | Power battery and electric vehicle |
| CN117080667A (en) * | 2023-10-16 | 2023-11-17 | 天津力神电池股份有限公司 | Battery box and battery pack |
| WO2023234735A1 (en) * | 2022-06-03 | 2023-12-07 | 주식회사 엘지에너지솔루션 | Battery pack |
| WO2023240872A1 (en) * | 2022-06-17 | 2023-12-21 | 湖北亿纬动力有限公司 | Battery pack |
| WO2024010361A1 (en) * | 2022-07-06 | 2024-01-11 | 주식회사 엘지에너지솔루션 | Battery pack, and energy storage system and vehicle comprising same |
| WO2024036524A1 (en) * | 2022-08-17 | 2024-02-22 | 宁德时代新能源科技股份有限公司 | Gas exhaust member, box, battery, and electrical apparatus |
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2021
- 2021-06-04 CN CN202121250800.0U patent/CN215816098U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202024A1 (en) * | 2022-04-20 | 2023-10-26 | 湖北亿纬动力有限公司 | Power battery and electric vehicle |
| CN115000611A (en) * | 2022-05-06 | 2022-09-02 | 摩登汽车有限公司 | Power battery assembly |
| WO2023234735A1 (en) * | 2022-06-03 | 2023-12-07 | 주식회사 엘지에너지솔루션 | Battery pack |
| WO2023240872A1 (en) * | 2022-06-17 | 2023-12-21 | 湖北亿纬动力有限公司 | Battery pack |
| WO2024010361A1 (en) * | 2022-07-06 | 2024-01-11 | 주식회사 엘지에너지솔루션 | Battery pack, and energy storage system and vehicle comprising same |
| WO2024036524A1 (en) * | 2022-08-17 | 2024-02-22 | 宁德时代新能源科技股份有限公司 | Gas exhaust member, box, battery, and electrical apparatus |
| CN117080667A (en) * | 2023-10-16 | 2023-11-17 | 天津力神电池股份有限公司 | Battery box and battery pack |
| CN117080667B (en) * | 2023-10-16 | 2024-01-12 | 天津力神电池股份有限公司 | Battery box and battery pack |
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