CN212542618U

CN212542618U - Power battery system and new energy automobile comprising same

Info

Publication number: CN212542618U
Application number: CN202021274440.3U
Authority: CN
Inventors: 林水杉; 李东
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-02-12
Anticipated expiration: 2030-07-01

Abstract

The utility model belongs to the technical field of power batteries, and provides a power battery system and a new energy automobile, wherein the power battery system comprises a battery pack and a thermal management system thereof, an explosion-proof valve is arranged on a box body of the battery pack, and the power battery system also comprises a liquid storage tank filled with cooling liquid or fire-fighting materials, and the liquid storage tank is provided with a first through hole and a second through hole for cooling liquid or fire-fighting materials; one end of the first exhaust pipe is connected with the explosion-proof valve, and the other end of the first exhaust pipe is connected with the first through hole and is used for conveying high-temperature gas sprayed out of the explosion-proof valve to the liquid storage tank when the battery pack is out of thermal control and/or conveying cooling liquid or fire-fighting materials to the battery pack when the battery pack is out of thermal control; one end of the second exhaust pipe is connected with the second through hole, and the other end of the second exhaust pipe is a free end and used for exhausting the cooled gas; in the vertical direction, the second through hole is higher than the liquid level in the liquid storage tank, and the first through hole is lower than the liquid level. The utility model discloses a first blast pipe leads battery package spun high temperature high pressure gas to the liquid reserve tank, reduces gaseous temperature through coolant liquid or fire control material, has reduced gaseous probability of burning fast outside the battery package, has protected personal property safety.

Description

Power battery system and new energy automobile comprising same

Technical Field

The utility model belongs to the technical field of the new energy battery, especially, relate to a power battery system and including its new energy automobile.

Background

With the continuous improvement of the energy density of the power battery, the safety problem of the power battery is more and more prominent, and particularly in the field of new energy automobiles, the safety of the battery influences the personal safety and is more non-negligible. When the internal thermal runaway of the vehicle-mounted battery box, a large amount of high-temperature gas is generated to enable the air pressure in the box to rise suddenly, the high-temperature gas which is not fully combusted is sprayed to the external environment in a short time, and the high-temperature gas meets oxygen and is instantly ignited, so that the safety of passengers is seriously endangered, and the great danger is caused to the surrounding environment.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a power battery system and new energy automobile aims at solving battery package thermal runaway time blowout gas and quick burning outside the case, and then threatens personnel and surrounding environment safety's in the car technical problem.

In order to achieve the above object, a first aspect of the present invention provides a power battery system, including battery package and thermal management system, be equipped with explosion-proof valve on the box of battery package, power battery system still includes:

the liquid storage tank is provided with a first through hole and a second through hole, and cooling liquid or fire-fighting materials are filled in the liquid storage tank;

the first exhaust pipe is connected with the explosion-proof valve at one end and connected with the first through hole at the other end, and is used for conveying high-temperature gas sprayed by the explosion-proof valve to the liquid storage tank for cooling when the battery pack is out of control due to heat, and/or conveying cooling liquid or fire-fighting materials to the battery pack for cooling when the battery pack is out of control due to heat; and

one end of the second exhaust pipe is connected with the second through hole, and the other end of the second exhaust pipe is a free end and used for exhausting gas cooled by cooling liquid or fire-fighting materials;

in the vertical direction, the second through hole is higher than the liquid level in the liquid storage tank, and the first through hole is lower than the liquid level.

Adopt the embodiment of the utility model provides a power battery system guides battery package spun high temperature high pressure gas to the liquid reserve tank through first blast pipe, through coolant liquid or fire control material phase transition heat absorption fast, with gaseous temperature reduce to below the ignition point fast to discharge external environment via the second blast pipe, the effectual probability that has reduced battery package thermal runaway combustion gas fast burning outside the battery package, protected in the car or near car personnel's safety, be particularly useful for higher energy density's power battery.

In addition, under the high temperature condition, explosion-proof valve easily melts or is damaged, and coolant or fire control material in the liquid storage tank can flow into the battery package, cools off the battery package.

In one embodiment, the thermal management system comprises a liquid cooling device, and the liquid storage tank is further connected with the liquid cooling device to provide cooling liquid or fire-fighting materials for the liquid cooling device; or

The heat management system comprises a liquid cooling device and a liquid storage device connected with the liquid cooling device, and the liquid storage box and the liquid storage device are arranged independently.

Through above-mentioned scheme, the liquid reserve tank is same stock solution container with this reservoir, heat management system original reservoir and battery package explosion-proof valve between connect first blast pipe can, can effectively utilize the compact overall arrangement of car inner space. When the liquid storage device and the liquid storage box of the heat management system are independent liquid storage containers, liquid components in the liquid storage box can be selected in a targeted mode according to chemical components and properties of high-temperature gas, toxic and harmful gas is reduced or eliminated, and safety is further improved.

In one embodiment, the first exhaust pipe comprises a first connecting section connected with the explosion-proof valve, a second connecting section connected with the first through hole, and a third connecting section which is positioned between the first connecting section and the second connecting section and is in a bent pipe shape;

the first connecting section, the second connecting section and the third connecting section are integrally formed and smoothly connected;

at least a part of the third connecting section is higher than the liquid level in the liquid storage tank.

Through this scheme, first linkage segment, second linkage segment and third linkage segment smooth connection make first blast pipe wholly be streamlined, reduce the resistance of first blast pipe to gas, reduce the impact of high-speed gas to first blast pipe simultaneously, and then reduce the risk that first blast pipe is washed out and takes off.

Furthermore, the first exhaust pipe also comprises a fourth connecting section which is connected between the first connecting section and the explosion-proof valve; a drain hole is formed in the bottom pipe wall of the first connecting section and/or the fourth connecting section;

the drain hole vertically extends from the inner surface of the bottom pipe wall to the outer surface of the bottom pipe wall;

or the drain hole extends from the inner surface of the bottom pipe wall to the outer surface of the bottom pipe wall in an inclined manner from one end of the first connecting section, which is used for connecting the explosion-proof valve.

By the design, liquid such as water can flow out along the drain holes, so that the phenomenon that the liquid is accumulated in a large quantity is avoided, and the structure that the drain holes vertically extend from the inner surface of the bottom pipe wall to the outer surface of the bottom pipe wall is convenient to process. When the drain hole is an inclined hole, the flow direction of the gas discharged from the explosion-proof valve is nearly opposite to the extending direction of the drain hole, and thus water can be more effectively discharged without air leakage.

Furthermore, the outer surface of the bottom pipe wall is provided with a water guide pipe communicated with the water drainage hole.

Further, the water guide duct extends in a direction different from the direction in which the drain hole extends.

Through setting up the aqueduct, can derive ponding faster, and gas flow time is longer in the aqueduct, is difficult to flow outside, can reduce the temperature in the pipe, even discharge outside, its danger is also lower. This structure is more suitable for a battery pack having an extremely high energy density and an extremely short gas discharge time.

In one embodiment, a check valve is provided at the first through hole of the reservoir or at the end of the first exhaust pipe for connection to the reservoir.

In this aspect, by providing the check valve, the liquid can be prevented from flowing backward into the first exhaust pipe.

In one embodiment, a check valve is arranged at the first through hole of the liquid storage tank or at one end of the first exhaust pipe, which is used for being connected with the liquid storage tank, and the height of any pipe section in the first exhaust pipe is lower than the height of the liquid level in the liquid storage tank.

In the scheme, the highest pipe section of the first exhaust pipe is lower than the liquid level, and under the high-temperature condition, after the one-way valve is melted or damaged, the cooling liquid or the fire-fighting material can smoothly flow into the battery pack to be cooled.

In one embodiment, a mesh member is provided at the first through hole of the reservoir or at an end of the first exhaust pipe for connecting the reservoir, for scattering gas discharged from the first exhaust pipe. Furthermore, the gas and the cooling liquid or the fire-fighting material can exchange heat sufficiently, and the temperature can be reduced quickly.

In one embodiment, two ends of the first exhaust pipe are respectively provided with an anti-falling structure for preventing the first exhaust pipe from separating from the explosion-proof valve and the liquid storage tank. Further, the first exhaust pipe is prevented from colliding with and burning by the high-speed gas.

In one embodiment, the part of the first exhaust pipe connected with the explosion-proof valve and the part of the first exhaust pipe connected with the liquid storage tank are provided with sealing rings. Thus, gas leakage can be prevented.

In one embodiment, the coolant or fire fighting material in the reservoir is a liquid capable of purifying toxic gases emitted from the battery pack.

Through the scheme, the safety of passengers can be further ensured, and the probability of poisoning is reduced.

In one embodiment, the number of first exhaust pipes is less than or equal to the number of second exhaust pipes; the inner diameter of the first exhaust pipe is smaller than or equal to the inner diameter of the second exhaust pipe.

Through this scheme, be favorable to gaseous discharge liquid reserve tank smoothly, avoid in the incasement volume influence discharge speed.

Furthermore, a plurality of airflow channels are arranged in the liquid storage tank; the airflow channel is connected with the second through hole in a one-to-one mode, and the airflow channel is connected with the first through hole in a one-to-one mode or in a many-to-one mode.

Through setting up airflow channel, can accelerate gas outgoing in abundant cooling, avoid the too big exhaust that leads to of liquid resistance to be slow.

On the other hand, the utility model provides a new energy automobile, including above-mentioned arbitrary embodiment power battery system.

The new energy automobile adopting the power battery system can effectively prevent the discharged gas from burning instantly in the surrounding environment after the battery pack is out of control due to heat, thereby ensuring the personal safety and material and property safety inside and outside the automobile.

Further, the first exhaust pipe and the liquid storage tank are arranged along the width direction of the body of the new energy automobile. So, can prevent to a certain extent that coolant liquid or fire control material from flowing backwards near explosion-proof valve, reduce the potential safety hazard.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 inventive labor.

Fig. 1 is a schematic view of an overall structure of a power battery system according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a power battery system according to an embodiment of the present invention;

fig. 3 is a schematic side view of a power battery system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first exhaust pipe in a power battery system according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of a first exhaust pipe in a power battery system according to an embodiment of the present invention;

fig. 6 is a schematic view of a working state of a check valve in a power battery system according to an embodiment of the present invention at normal temperature;

fig. 7 is a schematic view of a working state of a check valve in a power battery system according to an embodiment of the present invention at a high temperature;

fig. 8 is a schematic structural diagram of a liquid storage tank in a power battery system according to an embodiment of the present invention;

fig. 9 is another schematic structural diagram of a liquid storage tank in a power battery system according to an embodiment of the present invention;

fig. 10 is a schematic view of another structure of a liquid storage tank in a power battery system according to an embodiment of the present invention;

fig. 11 is an enlarged view of the area a in fig. 2.

The various reference numbers in the figures:

10-a box body, 20-an explosion-proof valve, 30-a first exhaust pipe, 40-a liquid storage tank, 50-a second exhaust pipe, 60-a sealing ring, 70-a grid piece, 80-an air flow channel, 90-a one-way valve and 91-a valve core;

31-a first connection segment, 32-a second connection segment, 33-a third connection segment, 34-a fourth connection segment; the drain holes 311, 312-a water guide pipe, 35-an anti-drop structure;

41-coolant or fire-fighting material, 42-first through hole, 43-second through hole.

Detailed Description

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 embodiments of the present invention, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or in the operating state, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and 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. The term "plurality" means two or more. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and the like are intended to be inclusive and mean that there may be, for example, a fixed connection, a removable connection, or an integral part. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The embodiment of the utility model provides a power battery system can be but not limited to and be arranged in new energy automobile, can in time with the cooling of high-temperature gas below the ignition point when battery package thermal runaway and blowout high-temperature gas, prevent that it from lighting a fire outside the battery package, improve passenger's the probability of fleing and personnel's personal safety on every side.

Referring to fig. 1 to 3, the power battery system includes a battery pack and a thermal management system thereof, the battery pack includes a case 10, a battery module is disposed in the case 10, and a cooling device is disposed outside or inside the case 10 for cooling the battery module. In order to improve the safety of the battery pack, the case body 10 is usually provided with an explosion-proof valve 20, and when the battery pack is out of control due to heat, high-temperature and high-pressure gas firstly breaks through the explosion-proof valve 20 and is discharged out of the case body, so that the case body 10 is prevented from exploding. In this embodiment, in order to prevent the high-temperature gas sprayed from the explosion-proof valve 20 from being ignited rapidly when encountering oxygen, the first exhaust pipe 30 is connected to the outside of the explosion-proof valve 20, and the other end of the first exhaust pipe 30 is provided with a liquid storage tank 40, and the inside of the liquid storage tank is filled with a cooling liquid or a fire-fighting material 41, wherein the cooling liquid or the fire-fighting material 41 can be water, a low-boiling-point easily-evaporated liquid, or the like; the liquid storage tank 40 is provided with a first through hole 42, and one end of the first exhaust pipe 30 is connected to the first through hole 42 and further communicated with the liquid storage tank 40; a second through hole 43 is opened in an upper portion of the liquid storage tank 40, and a second exhaust pipe 50 is connected to the second through hole 43. The height of the second through hole 43 is higher than the liquid level in the liquid storage tank 40 in the vertical direction, and the height of the first through hole 42 is lower than the liquid level, so that high-temperature gas enters from the lower portion of the liquid storage tank 40 and rapidly floats up to the upper portion of the liquid storage tank 40 in the cooling liquid or the fire extinguishing material 41, and is discharged from the second through hole 43 and the second exhaust pipe 50. It should be understood that the liquid storage tank 40 in this embodiment is generally a cubic structure, and has top and bottom portions opposite to each other, and a cylindrical side wall, the upper portion of the liquid storage tank 40 may be the upper half portion of the side wall of the liquid storage tank 40, or the top portion of the liquid storage tank 40, and the lower portion of the liquid storage tank 40 may be the lower half portion of the side wall of the liquid storage tank 40, or the bottom portion of the liquid storage tank 40.

The embodiment of the utility model provides a power battery system, 20 department connect first blast pipe 30 at the explosion-proof valve of battery package, connect liquid reserve tank 40 at the other end of first blast pipe 30, connect second blast pipe 50 on the upper portion of liquid reserve tank 40, lead battery package spun high temperature high pressure gas to liquid reserve tank 40 through first blast pipe 30, absorb heat fast through coolant liquid or 41 phase changes of fire-fighting material, reduce gaseous temperature below the ignition point fast, and discharge external environment via second blast pipe 50, the effectual probability that battery package thermal runaway combustion gas fast burns outside the battery package that has reduced, the safety of personnel in the car or near car has been protected. Especially for the power battery with higher energy density, the gas sprayed out of the battery pack is sprayed out within a very short time (such as within 10 seconds) after thermal runaway, the gas is instantly burnt outside the battery pack, the escape time of passengers is extreme, the life safety is seriously threatened, the gas sprayed out of the battery pack can be rapidly cooled to be below a burning point by adopting the scheme provided by the embodiment, and the method is an effective means for improving the safety of a battery system.

In addition, under the high temperature condition, the explosion-proof valve melts or the damage back, and coolant liquid or fire control material in the liquid storage tank can also flow into the battery package, cools off the battery package, further promotes the security of battery package.

The cooling liquid or the fire-fighting material described herein is a conventional material commonly used in the art, and will not be described herein, and may be, but is not limited to, liquid, powder, etc.

The utility model discloses in, the thermal management system of battery package can adopt the liquid cooling mode, and it includes the liquid cooling device, and this liquid cooling device includes liquid cooling board and corresponding connecting tube to and be used for the reservoir of storage coolant liquid or fire control material 41. In one embodiment, the tank 40 is the same as the reservoir, i.e. the first exhaust pipe 30 is connected between the reservoir of the thermal management system and the battery pack explosion-proof valve 20 for cooling the exhaust gas of the battery pack. In this way, a compact layout in a limited space is possible.

In another embodiment, the reservoir of the thermal management system and the reservoir 40 are separate reservoirs. In this way, the liquid composition in the tank 40 can be selected with a specific view to the chemical composition and properties of the hot gas. Further, a gas capable of purifying to reduce or eliminate toxic and harmful gases can be added, so that the safety is further improved, and particularly, when passengers are trapped in the vehicle, the toxic events can be avoided or reduced.

Referring to fig. 4, in one embodiment, in order to rapidly discharge the high-temperature gas to the tank 40, the first exhaust pipe 30 includes a first connection section 31 connected to the explosion-proof valve 20, a second connection section 32 connected to the first through hole 42, and a third connection section 33 located between the first connection section 31 and the second connection section 32 and having a bent pipe shape; first linkage segment 31, second linkage segment 32 and third linkage segment 33 integrated into one piece and smooth connection avoid crossing wide-angle buckling, make first exhaust pipe 30 wholly be streamlined, reduce first exhaust pipe 30 to gaseous resistance, prevent the battery package explosion, reduce high-speed gaseous impact to first exhaust pipe 30 simultaneously, and then reduce the risk that first exhaust pipe 30 is broken away and takes off by dashing.

It is understood that the first exhaust pipe 30 is not limited to be streamlined, but may be irregularly curved, such as S-shaped, and may have a shape that does not cause a large resistance to the airflow.

In combination with the structure of the first exhaust pipe 30 and the liquid pressure principle, at least a part of the pipe section of the third connecting section 33 is higher than the liquid level in the liquid storage tank 40, so as to avoid the liquid in the liquid storage tank 40 from flowing backward to the vicinity of the explosion-proof valve 20, which brings about a potential safety hazard. Note that at least a part of the third connection portion 33 is higher than the liquid level in the liquid storage tank 40, which means that the liquid storage tank 40 and the first exhaust pipe 30 are installed in the vehicle and the vehicle is in a normal state.

Further, since the flow rate of the gas ejected from the explosion-proof valve 20 is high, it is preferable to form the first exhaust pipe 30 of a rigid material in order to prevent the high-speed gas from impacting the first connection pipe and deforming the first connection pipe to block the exhaust.

More preferably, the first exhaust pipe 30 having the streamline structure as described above can be made of a rigid material by combining the above two embodiments.

Further, in order to improve the connection strength and the sealing property between the first connection section 31 and the explosion-proof valve 20, the first connection section 31 is connected to the explosion-proof valve 20 through the fourth connection section 34.

Based on the three-segment structure of the first exhaust pipe 30, the third connecting segment 33 may be arc-shaped, like an "n" shape, and the like, wherein the bottom wall of the middle segment is higher than the liquid level of the liquid storage tank 40, and preferably, the specific size of the bottom wall of the middle segment higher than the liquid level may be determined by combining the maximum allowable climbing angle of the automobile during driving, so as to ensure that the liquid does not flow through the third connecting segment 33 and enter the first connecting segment 31 when the automobile climbs or descends.

Referring to fig. 4, in an embodiment of the present invention, in order to better solve the problem of the liquid pouring into the first exhaust pipe 30, a drain hole 311 is disposed on the bottom pipe wall of the first connection section 31 and/or the fourth connection section 34, the drain hole 311 is preferably a capillary hole with a small diameter, and the inner diameter thereof can be, but is not limited to, 1/50-1/20 of the inner diameter of the first exhaust pipe 30, so that the liquid flowing into the first connection section 31 and the fourth connection section 34 can flow out along the capillary hole, thereby avoiding a large amount of liquid, and the high-speed gas ejected from the explosion-proof valve 20 can be ejected along the pipe section with the large pipe diameter, and the probability of liquid accumulation is small, thereby solving the problem of liquid accumulation and avoiding gas leakage.

Further preferably, the drainage hole 311 may be opened in a plurality to form a micro-pore array, and the plurality of micro-pores can drain water quickly.

Further preferably, the extending direction of the drainage holes 311 may be along the thickness direction of the bottom tube wall of the first connecting section 31 and the fourth connecting section 34, that is, the drainage holes 311 vertically extend from the inner surface of the bottom tube wall to the outer surface of the bottom tube wall, and the structure is convenient for processing.

More preferably, the drainage hole 311 extends obliquely from the inner surface of the bottom pipe wall to the end of the first connecting section 31 or the fourth connecting section 34 for connecting the explosion-proof valve 20 to the outer surface of the bottom pipe wall, that is, the drainage hole 311 is an oblique hole and is oblique towards the explosion-proof valve 20, so that the flow direction of the gas discharged from the explosion-proof valve 20 is nearly opposite to the extending direction of the drainage hole 311 on the premise of not obstructing the drainage, the high-temperature gas is hardly ejected from the drainage hole 311 extending in the opposite direction when being ejected outwards at high speed, and the drainage and the air tightness can be realized more effectively.

Referring to fig. 5, based on the above-mentioned structure of the vertically or obliquely extending drain hole 311, the present embodiment further provides a water guide pipe 312 on the outer surface of the bottom pipe wall, which is communicated with the drain hole 311. The water guide pipe 312 is arranged, accumulated water can be led out more quickly, meanwhile, the water guide pipe 312 has a certain length, the water guide pipe is similar to a capillary pipeline, even if a small part of gas sprayed out at a high speed in the first exhaust pipe 30 is discharged from the water discharge hole 311, the gas can enter the water guide pipe 312 later, the water guide pipe 312 is thin, the gas flows in the water guide pipe 312 for a long time, the gas is not easy to flow out of the outside, the temperature can be reduced in the pipe, and even if the gas is discharged to the outside, the danger is low. This structure is more suitable for a battery pack having an extremely high energy density and an extremely short gas discharge time.

Based on the design of the water guide pipe 312, in order to further improve the safety, the orientation of the water guide pipe 312 is designed to be not parallel to the orientation of the drain hole 311, the extending direction of the water guide pipe 312 is different from the extending direction of the drain hole 311, the gas enters the water guide pipe 312 from the drain hole 311 and needs to be bent by a large angle, and the bent flow passage can greatly limit the speed of the gas flow, so that the energy of the gas flow is greatly weakened, the outflow quantity of the gas flow is limited, and the safety is improved.

In another embodiment of the present invention, the problem of liquid flowing backward can be solved in another way. A check valve 90 is provided at a connection portion of the reservoir 40 and the first exhaust pipe 30 to prevent the coolant or the fire fighting material 41 from flowing into the first exhaust pipe 30. Specifically, a check valve 90 may be provided at the first through hole 42 of the tank 40 for connecting the first exhaust pipe 30, or the check valve 90 may be provided at an end of the first exhaust pipe 30 for connecting the tank 40. The check valve 90 prevents the liquid in the reservoir tank 40 from flowing to the first exhaust pipe 30, but allows the gas in the first exhaust pipe 30 to flow into the reservoir tank 40.

Referring to fig. 6 and 7, the check valve 90 seals the coolant or the fire fighting material in the reservoir 40 at normal temperature, and prevents the coolant or the fire fighting material from flowing into the first exhaust pipe 30. Under the condition of high-temperature gas, the valve core 91 is easily melted or damaged, so that the high-temperature gas flows into the liquid storage tank 40. Further, after the valve body 91 is broken, the coolant or the fire extinguishing material 41 may flow back into the battery pack, and the temperature of the battery pack can be lowered.

In another embodiment, the check valve 90 is also disposed at the connection portion of the liquid storage tank 40 and the first exhaust pipe 30, and the highest pipe section (such as the third connection section 33) of the first exhaust pipe 30 is set to be lower than the liquid level, so that the coolant or the fire fighting material 41 can be ensured to smoothly flow into the battery pack for cooling after the valve core 91 is melted or damaged.

Referring to fig. 2, in the embodiment of the present invention, since the thermal runaway of the battery pack generates a large amount of gas with insufficient combustion, in order to further prevent the gas from leaking to the outside, the sealing rings 60 are disposed at the connection portion of the first exhaust pipe 30 and the explosion-proof valve 20 and the connection portion of the first exhaust pipe 30 and the liquid storage tank 40. When the first exhaust pipe 30 is provided with the fourth connecting section 34, the sealing ring 60 is disposed on the inner wall of the fourth connecting section 34 and is closely attached to the explosion-proof valve 20. Specifically, the sealing ring 60 may be made of a high temperature resistant and corrosion resistant material such as a silicone ring. The packing 60 may be fitted over an outer wall of the first exhaust pipe 30 for connecting the end of the liquid storage tank 40 and the explosion-proof valve 20.

In the embodiment of the present invention, because first exhaust pipe 30 is used for leading out the battery package thermal runaway time spun high temperature gas, this gas is with very fast blowout, for guaranteeing the joint strength of first exhaust pipe 30 and explosion-proof valve 20, prevents that first exhaust pipe 30 from receiving violent impact and breaking away from explosion-proof valve 20, and this embodiment sets up anti-disengaging structure 35 in the one end that first exhaust pipe 30 and explosion-proof valve 20 are connected. Referring to fig. 6 and 7, specifically, an inverse buckle may be provided on the outer wall of the end portion of the first exhaust pipe 30, and a buckle groove may be provided at a position where the explosion-proof valve 20 is provided corresponding to the battery pack; alternatively, an external thread may be provided on the outer wall of the end portion of the first exhaust pipe 30, and an internal thread may be provided at a position corresponding to the battery pack where the explosion-proof valve 20 is provided. Other structures for preventing the first exhaust pipe 30 from coming off may also be adopted in this embodiment, and this embodiment is not illustrated.

Referring further to fig. 2 and 11, in an embodiment of the present invention, in order to make the gas discharged from the battery pack enter the cooling liquid or the fire-fighting material 41 more quickly and cool down sufficiently, at the first through hole 42 of the liquid storage device, or the first exhaust pipe 30 is provided with a grid piece 70 on the inner wall of the end for connecting the first through hole 42, the grid piece 70 has a plurality of grids, which can break up the gas discharged from the first exhaust pipe 30, so that the stronger gas flow can be broken up sufficiently, and the purpose of cooling down rapidly is achieved.

Specifically, the mesh 70 may be interwoven by a plurality of strips. The mesh 70 may also be a column comprising a plurality of short tubes arranged side by side. The mesh 70 may also be a plate-like member having a plurality of through holes.

Referring to fig. 8, in the embodiment of the present invention, the cooling and discharging of the gas may be promoted by designing the positions of the first and second through

holes

42 and 43. For example, the first through hole 42 is disposed at the lower half of the sidewall of the liquid storage tank 40, and disposed near the bottom, so as to facilitate the airflow discharged from the first exhaust pipe 30 to rapidly enter the liquid storage tank 40, and the second through hole 43 is preferably disposed at the top of the liquid storage tank 40, so as to facilitate the upward discharge of the cooled gas and the gas evaporated from the coolant or the fire fighting material 41. Of course, it is also possible to dispose the first through hole 42 at the bottom of the liquid storage tank 40, or dispose the second through hole 43 at a position near the top of the upper half of the liquid storage tank 40, and the design can be combined with the specific application scenario.

Referring to fig. 9, in the embodiment of the present invention, in order to discharge the gas from the liquid storage tank 40 more smoothly and enhance the fluidity of the gas, the first exhaust pipe 30 and the second exhaust pipe 50 may be respectively provided in plural, and correspondingly, the number of the first through holes 42 and the number of the second through holes 43 may also be respectively provided in plural. The quantity of first blast pipe 30 is less than or equal to the quantity of second blast pipe 50, high-temperature gas gets into the liquid reserve tank 40 after, coolant liquid or fire control material 41 are heated the quick phase transition heat absorption and make gaseous cooling, and simultaneously, coolant liquid or fire control material 41 phase transition evaporation produce a large amount of gas, boil off gas and battery package combustion gas are discharged by second blast pipe 50, consequently, the gas volume of second blast pipe 50 combustion gas is greater than first blast pipe 30 and discharges to the gas volume, the quantity of second blast pipe 50 is more, be favorable to the smooth exhaust. Similarly, the inner diameter of the second exhaust pipe 50 is greater than or equal to the inner diameter of the first exhaust pipe 30, which is also beneficial to the exhaust of the second exhaust pipe 50 and prevents the gas from being accumulated in the liquid storage tank 40.

As a further improvement of the present invention, referring to fig. 10, considering that the gas entering the liquid storage tank 40 is subjected to liquid resistance, which results in a relatively slow gas flow rate and may affect the displacement of the first exhaust pipe 30, a plurality of air flow channels 80 may be disposed in the liquid storage tank 40, one end of each air flow channel 80 is connected to one of the second through holes 43, and the other end of each air flow channel 80 is connected to one of the first through holes 42 or to a plurality of the first through holes 42. It will be appreciated that the first through-holes 42 are passages for the inflow of high temperature gas into the tank 40, which allow the gas to flow into a plurality of different gas flow passages 80 after entering from one first through-hole 42, and the second through-holes 43 are passages for the gas to exit the tank 40, and each gas flow passage 80 is adapted to communicate with one second through-hole 43, i.e., with one second gas discharge pipe 50, for the smooth gas discharge.

In addition, when only one of the first exhaust pipe 30 and the second exhaust pipe 50 is provided, only one airflow channel 80 is not excluded, the two ends of the airflow channel 80 are respectively connected with the first through hole 42 and the second through hole 43, in order to ensure sufficient cooling of the gas, the airflow channel 80 is set to be a curve, the curve channel can influence the gas discharge speed, further, the flow rate and the cooling effect are restricted, and the difficulty of structural design is relatively increased. However, the invention does not exclude the possibility of using this solution, if necessary.

When first blast pipe 30 and second blast pipe 50 all only one, set up a plurality of airflow channel 80 and can discharge the air current lane, can realize on the one hand that gaseous and coolant liquid or fire control material 41 are abundant heat exchange, on the other hand, can be without having to design the passageway for circuitous curve type, have certain radian prevent that the air current from flowing at the excessive speed can, can compromise the effect of gas discharge speed and cooling. At this time, both ends of the plurality of air flow passages 80 are collected in the first through hole 42 and the second through hole 43, respectively.

When the liquid storage tank 40 is provided with the plurality of first through holes 42 and the plurality of second through holes 43, it is more preferable to adopt the structure of the plurality of air flow passages 80, and the air flow passages 80 may be connected to each of the second through holes 43 and the first through holes 42.

The utility model provides a power battery system mainly is applicable to new energy automobile, adds above-mentioned first blast pipe 30, liquid reserve tank 40 and second blast pipe 50 in traditional battery system, can reduce the probability that battery package thermal runaway reveals gas at external fast burning, the safety of the guarantee person and material property.

The first exhaust pipe 30 may be fixed by attaching to a structure of the vehicle body, the first exhaust pipe 30 is entirely located on a vertical plane, and the second exhaust pipe 50 extends in a vertically upward or obliquely upward direction, protrudes away from the battery pack, and is preferably guided to the outside of the vehicle body.

In order to effectively utilize the vehicle body space, the liquid storage tank 40 directly uses the liquid storage device of the cooling liquid or the fire-fighting material 41 of the thermal management system, that is, the liquid storage device of the thermal management system is simultaneously used as the liquid storage tank 40, the cooling liquid or the fire-fighting material 41 in the liquid cooling scheme of the battery pack is used for cooling, and the recycling of the cooling liquid or the fire-fighting material 41 in the normal working process of the battery pack is not influenced. Thus, the existing structure can be effectively utilized, the first exhaust pipe 30 is installed at the explosion-proof valve 20 in a matching mode, and the second exhaust pipe 50 is connected to the liquid storage device, so that the anti-explosion valve is particularly suitable for the situation that the space of a vehicle body is very limited.

In addition, in the driving process of the automobile, the front and back directions of the first exhaust pipe 30 deflect due to the up and down slope of the road surface and the side direction of the road surface shakes due to the unevenness of the road surface, so that the height of the highest point of the first exhaust pipe 30 and the height of the liquid level in the liquid storage tank 40 can change relatively, if the slope is large, the first exhaust pipe 30 is filled with liquid, and besides the problem of liquid filling with liquid is solved by the mode of the embodiment, the direction of the first exhaust pipe in the automobile can be reasonably designed. For example, since the frequency and amplitude of the lateral sway of the vehicle body are generally smaller than the frequency and deflection amplitude of the uphill and downhill, the first exhaust pipe 30 and the liquid storage tank 40 can be arranged substantially along the vehicle body width direction with priority given to the uphill and downhill, and when the vehicle ascends and descends, the height difference between the liquid level of the liquid storage tank 40 and the highest point of the first exhaust pipe 30 changes relatively slowly, and the situation of liquid flowing backward is not likely to occur.

In one embodiment, when a plurality of second exhaust pipes 50 are provided, they may extend in different directions to avoid concentrated gas discharge, thereby further reducing the possibility of combustion.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a power battery system, includes battery package and thermal management system thereof, be equipped with explosion-proof valve on the box of battery package, its characterized in that, power battery system still includes:

the first exhaust pipe is connected with the explosion-proof valve at one end and connected with the first through hole at the other end, and is used for conveying high-temperature gas sprayed out of the explosion-proof valve to the liquid storage tank for cooling when the battery pack is out of control due to heat, and/or conveying cooling liquid or fire-fighting materials to the battery pack for cooling when the battery pack is out of control due to heat; and

one end of the second exhaust pipe is connected with the second through hole, and the other end of the second exhaust pipe is a free end and used for exhausting gas cooled by the cooling liquid or the fire-fighting material;

2. The power battery system of claim 1, wherein the thermal management system comprises a liquid cooling device, the reservoir further connected to the liquid cooling device to provide cooling fluid or a fire fighting material to the liquid cooling device; or

3. The power battery system according to claim 1, wherein the first exhaust pipe comprises a first connecting section connected to the explosion-proof valve, a second connecting section connected to the first through hole, and a third connecting section in a bent pipe shape between the first connecting section and the second connecting section;

4. The power battery system of claim 3, wherein the first exhaust duct further comprises a fourth connecting section connected between the first connecting section and an explosion-proof valve;

a drain hole is formed in the bottom pipe wall of the first connecting section and/or the fourth connecting section;

or the drain hole extends from the inner surface of the bottom pipe wall to the end of the first connecting section for connecting the explosion-proof valve to the outer surface of the bottom pipe wall in an inclined mode.

5. The power battery system of claim 4, wherein the outer surface of the bottom tube wall is provided with a water conduit in communication with the drain hole.

6. The power battery system of claim 5, wherein the water conduit extends in a direction different from the direction in which the drain hole extends.

7. The power battery system according to any of claims 1 to 6, characterized in that a one-way valve is arranged at the first through hole of the reservoir or at the end of the first exhaust pipe for connecting the reservoir.

8. The power battery system according to claim 1 or 2, characterized in that a one-way valve is arranged at the first through hole of the liquid storage tank or at the end of the first exhaust pipe for connecting the liquid storage tank, and the height of any pipe section in the first exhaust pipe is lower than the height of the liquid level in the liquid storage tank.

9. The power battery system according to any of claims 1 to 6, characterized in that a mesh is provided at the first through hole of the reservoir or at the end of the first exhaust pipe for connection to the reservoir for breaking up the gas discharged by the first exhaust pipe.

10. The power battery system according to any of claims 1 to 6, wherein both ends of the first exhaust pipe are respectively provided with a retaining structure for preventing the first exhaust pipe from being separated from the explosion-proof valve and the liquid storage tank.

11. The power battery system according to any of claims 1 to 6, wherein sealing rings are arranged at the connection part of the first exhaust pipe and the explosion-proof valve and at the connection part of the first exhaust pipe and the liquid storage tank.

12. The power battery system according to any of claims 1 to 6, wherein the cooling fluid or fire fighting material in the reservoir is a liquid capable of purifying toxic gases emitted from the battery pack.

13. The power cell system of any of claims 1 to 6, wherein the number of first exhaust pipes is less than or equal to the number of second exhaust pipes; the inner diameter of the first exhaust pipe is smaller than or equal to the inner diameter of the second exhaust pipe.

14. The power battery system of claim 13, wherein a plurality of gas flow channels are provided in the reservoir; the airflow channel is connected with the second through hole in a one-to-one mode, and the airflow channel is connected with the first through hole in a one-to-one mode or in a many-to-one mode.

15. A new energy automobile, characterized by comprising the power battery system of any one of claims 1 to 14.

16. The new energy vehicle according to claim 15, wherein the first exhaust pipe and the reservoir tank are arranged in a vehicle body width direction of the new energy vehicle.