CN113054283A

CN113054283A - Battery cooling system and electric automobile

Info

Publication number: CN113054283A
Application number: CN202110292005.6A
Authority: CN
Inventors: 侯磊; 郑玉龙; 李东宁; 高涛
Original assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-06-29
Anticipated expiration: 2041-03-18
Also published as: CN113054283B

Abstract

The application provides a battery cooling system and electric automobile. The battery cooling system comprises a battery component, a box body and a cooling component, wherein the box body is provided with an inner cavity, and the battery component is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly; the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity; the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall and the inner cavity of the expansion cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second intake pipe is used for letting in the refrigeration air current, and piston assembly has the conducting hole, and piston assembly is used for the gas at the expansion intracavity to be heated the inflation and remove to drive conducting hole and second intake pipe intercommunication, and carry the refrigeration air current to the inner chamber in from the second intake pipe. The battery cooling system has a better cooling effect.

Description

Battery cooling system and electric automobile

Technical Field

The application relates to the technical field of electric automobiles, in particular to a battery cooling system and an electric automobile.

Background

Because the environmental problem and the energy crisis are increasingly prominent, energy conservation and environmental protection become necessary trends of the automobile industry, wherein the development trend of the electric automobile is particularly rapid, but the key technology for restricting the development of the electric automobile is the improvement of the battery performance; the power battery can take place electrochemical reaction when charge-discharge and produce joule heat, influences the temperature of battery, if not in time to the inside heat dissipation of taking a breath of power battery case, the change of temperature must make to have certain temperature difference between the battery, and then influences the stability of group battery.

Chinese patent CN207765587U discloses a power lithium battery air cooling device, including the forced air cooling case body, the upper end of forced air cooling case body is equipped with the upper cover plate, setting through first louvre, make the ventilation and heat dissipation of this internal chamber of forced air cooling case, setting through the second louvre, play the effect of ventilation once more, and the slope of second louvre sets up downwards to one side opening outwards, dustproof and waterproof when ventilating, setting through the drier case, place the drier inside the drier case, reduce the humidity of this internal chamber of forced air cooling case, the setting of forced air cooling unit is installed to the inner wall through the chamber door, reach the heat dissipation to the internal chamber of forced air cooling case, the ventilation effect.

However, the air cooling device for the power lithium battery disclosed in the above patent only adopts natural air suction, so that when the heat generated by the battery is large, the heat dissipation and cooling effects of the air cooling device are not significant, and rapid cooling cannot be realized.

Disclosure of Invention

The embodiment of the application provides a battery cooling system and electric automobile, and the radiating effect is better, can realize the rapid cooling to the battery.

On one hand, the application provides a battery cooling system which comprises a battery component, a box body and a cooling component, wherein the box body is provided with an inner cavity, and the battery component is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly; the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity; the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall and the inner cavity of the expansion cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second intake pipe is used for letting in the refrigeration air current, and piston assembly has the conducting hole, and piston assembly is used for the gas at the expansion intracavity to be heated the inflation and remove to drive conducting hole and second intake pipe intercommunication, and carry the refrigeration air current to the inner chamber in from the second intake pipe.

Optionally, in the battery cooling system provided in the present application, the piston assembly includes a moving member and an elastic member, and the via hole is formed in the moving member; the moving piece is used for moving under the pressure of the gas when the gas in the expansion cavity is heated and expanded so as to enable at least part of the conducting hole to be communicated with at least part of the pipe orifice of the second gas inlet pipe; the elastic piece is connected between the moving piece and the expansion cavity and used for enabling the moving piece to reset so that at least part of the moving piece seals the pipe orifice of the second air inlet pipe.

Optionally, in the battery cooling system provided in the present application, the second cooling assembly further includes a heat conducting member, the heat conducting member is disposed at a joint of the expansion cavity and the box body, and the heat conducting member is configured to conduct heat in the inner cavity to the expansion cavity.

Optionally, in the battery cooling system provided in this application, the second cooling assembly further includes a proximity switch, and the proximity switch has an induction surface, and the induction surface is used for inducing a moving member.

Optionally, in the battery cooling system provided by the application, the expansion cavity is internally provided with a blocking portion, the blocking portion divides the expansion cavity into a first expansion cavity and a second expansion cavity, the second expansion cavity is located on one side of the first expansion cavity, which is far away from the box body, the blocking portion is provided with an air hole, and the first expansion cavity is communicated with the second expansion cavity through the air hole; the wall of the second expansion chamber is in sliding engagement with the first end of the displacement member.

Optionally, in the battery cooling system that this application provided, the heat conduction piece includes heat transfer board and fin, and the heat transfer board is connected in the lateral wall in inflation chamber, and the extending direction of heat transfer board is unanimous with the extending direction of the wall in inflation chamber, and the fin connection is in the heat transfer board, and the fin includes first fin and second fin, and first fin and second fin are a plurality ofly, and a plurality of first fins are located the inner chamber, and a plurality of second fins are located the inflation intracavity.

Optionally, in the battery cooling system provided in the present application, the first cooling assembly further includes a check valve, the check valve is disposed on the first air inlet pipe, and the check valve is configured to control gas in the first air inlet pipe to flow into the inner cavity.

Optionally, in the battery heat dissipation system provided by the application, the first heat dissipation assembly further includes a blocking member, the blocking member is disposed in the inner cavity, and the blocking member divides the inner cavity into a first chamber and a second chamber, the first air inlet pipe and the second air inlet pipe are respectively communicated with the first chamber, and the battery assembly is disposed in the second chamber; the barrier member is provided with a plurality of heat dissipation holes, and the first cavity is communicated with the second cavity through the plurality of heat dissipation holes.

Optionally, in the battery cooling system that this application provided, still include the fan, the fan setting is on the top of box, and the fan is used for carrying the hot gas flow in the inner chamber to outside the box.

On the other hand, the application provides an electric automobile which comprises an air conditioner, a controller and the battery cooling system, wherein the air conditioner is provided with an air outlet pipe which is communicated with a second air inlet pipe of the battery cooling system, and the air conditioner is electrically connected with the controller; the controller is used for controlling the air conditioner to start when the conducting hole of the battery cooling system is communicated with the second air inlet pipe, so that the refrigerating air flow generated by the air conditioner is conveyed into the box body of the battery cooling system through the second air inlet pipe.

In the battery cooling system and the electric automobile provided by the application, the battery cooling system comprises a battery component, a box body and a cooling component, wherein the box body is provided with an inner cavity, and the battery component is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly; the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity; the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall and the inner cavity of the expansion cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second intake pipe is used for letting in the refrigeration air current, and piston assembly has the conducting hole, and piston assembly is used for the gas at the expansion intracavity to be heated the inflation and remove to drive conducting hole and second intake pipe intercommunication, and carry the refrigeration air current to the inner chamber in from the second intake pipe. The battery cooling system that this application provided has better radiating effect, can effectively dispel the heat to battery pack.

The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a battery heat dissipation system according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a portion A of FIG. 1;

fig. 3 is a schematic structural diagram of a heat conducting member in a battery heat dissipation system according to an embodiment of the present disclosure;

fig. 4 is a schematic view illustrating a gas flow direction in a battery heat dissipation system according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application.

Description of reference numerals:

1-a battery assembly; 2-a box body; 3-a heat dissipation assembly; 4-a fan;

10-battery cooling system; 20-air conditioning; 30-a controller; 21-lumen; 22-a mounting portion; 31-a first heat dissipating component; 32-a second heat dissipation assembly;

100-electric vehicle; 201-an air outlet pipe; 211-a first chamber; 212-a second chamber; 213-a third chamber; 214-communicating holes; 311-a first intake pipe; 312-a one-way valve; 313-a barrier; 321-an expansion chamber; 322-a piston assembly; 323-second intake pipe; 324-a thermally conductive member; 325-proximity switch;

2131-a first vent hole; 2132-a second vent; 3131-heat dissipating holes; 3211-a pilot hole; 3212-a barrier; 3213-a first expansion chamber; 3214-a second expansion chamber; 3221-via hole; 3222-a moving member; 3223-an elastic member; 3241-heat exchange plate; 3242-fins;

32121-air holes; 32221-a position-limiting part; 32222-a guide portion; 3242 a-first fin; 3242 b-second Fin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that, in the description of the present application, the terms "first" and "second" are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Because the environmental problem and the energy crisis are increasingly prominent, energy conservation and environmental protection become necessary trends of the automobile industry, wherein the development trend of the electric automobile is particularly rapid, but the key technology for restricting the development of the electric automobile is the improvement of the battery performance; the power battery can generate an electrochemical reaction to generate Joule heat during charging and discharging, the temperature of the battery is influenced, if the inside of the power battery box is not ventilated and radiated in time, certain temperature difference exists between the batteries due to temperature change, and the stability of the battery pack is further influenced; meanwhile, the aging rate of the electrolyte, the electrodes and the partition plates can be accelerated by high temperature, so that the consistency of the battery pack is poor, and finally the whole battery pack fails in advance; in addition, frequent large-current charging and discharging in the electric vehicle easily causes rapid rise of the battery temperature, and further causes serious safety problems such as thermal runaway and explosion of the battery pack.

Therefore, whether the heat dissipation performance of the power battery is high or not becomes a key factor for determining the performance of the electric vehicle.

From this, this application provides a battery cooling system and electric automobile, and the radiating effect is better, can realize the rapid cooling to the battery.

The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a battery cooling system according to an embodiment of the present application. Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1. Fig. 3 is a schematic structural diagram of a heat conducting member in a battery cooling system according to an embodiment of the present disclosure. Fig. 4 is a schematic view illustrating a flow direction of gas in the battery heat dissipation system according to the embodiment of the present disclosure.

As shown in fig. 1 to 4, the present embodiment provides a battery heat dissipation system 10, which includes a battery assembly 1, a case 2 and a heat dissipation assembly 3, wherein the case 2 has an inner cavity 21, and the battery assembly 1 is disposed in the inner cavity 21; the heat dissipation assembly 3 includes a first heat dissipation assembly 31 and a second heat dissipation assembly 32; the first heat dissipation assembly 31 comprises a first air inlet pipe 311, a first end of the first air inlet pipe 311 is communicated with the outside atmosphere, and a second end of the first air inlet pipe 311 is communicated with the inner cavity 21; the second heat dissipation assembly 32 comprises an expansion cavity 321, a piston assembly 322 and a second air inlet pipe 323, the expansion cavity 321 and the second air inlet pipe 323 are both arranged on the box body 2, the cavity wall of the expansion cavity 321 and the inner cavity 21 have heat conduction, and the piston assembly 322 is in sliding fit with the expansion cavity 321; the second air inlet pipe 323 is used for introducing a refrigerating air flow, the piston assembly 322 is provided with a through hole 3221, and the piston assembly 322 is used for heating, expanding and moving air in the expansion cavity 321 so as to drive the through hole 3221 to be communicated with the second air inlet pipe 323 and convey the refrigerating air flow from the second air inlet pipe 323 to the inner cavity 21; the refrigerant gas flow may be a gas flow generated by a certain refrigeration system or a gas flow containing a refrigerant, and the refrigerant gas flow is not particularly limited.

It should be noted that the expansion chamber 321 may be fixedly disposed on the sidewall of the box body 2, for example, by welding, and the expansion chamber 321 may also be detachably connected to the sidewall of the box body 2 by a threaded fastener. Here, the connection manner between the expansion chamber 321 and the case 2 is not particularly limited.

Further, in some embodiments, the battery assembly 1 may be a plurality of battery assemblies, and the battery assemblies may include lithium ion batteries and the like, and the number and specific structure of the battery assemblies 1 are not limited herein.

Specifically, the battery cooling system 10 provided in this embodiment further includes a fan 4, the fan 4 is disposed on the top of the box 2, and the fan 4 is configured to convey the hot air flow in the inner cavity 21 to the outside of the box 2.

Note that, in order to accelerate the flow of the gas, the number of the fans 4 may be plural, and the number of the fans 4 is not particularly limited.

In a specific implementation manner of this embodiment, the top of the box body 2 further has a hollow mounting portion 22, the mounting portion 22 is disposed corresponding to the fan 4, the fan 4 is disposed in the mounting portion 22, and during the rotation of the fan 4, the hot air in the inner cavity 21 can flow out of the box body 2 through the mounting portion 22.

In the battery heat dissipation system 10 provided in this embodiment, firstly, in the working process of the fan 4, the hot air flow in the inner cavity 21 flows to the outside under the action of the fan 4, so as to dissipate heat of the battery assembly 1; secondly, external air flow enters the inner cavity through the first air inlet pipe 311, and under the action of the fan 4, hot air flow in the inner cavity 21 flows to the outside from the inner cavity 21, so that heat dissipation is performed on the battery component 1 in the inner cavity 21 again; further, when heat in the inner cavity 21 enters the expansion cavity 321 through heat conduction, air pressure in the expansion cavity 321 can be gradually increased, the piston assembly 322 is pushed to move, when the via hole 3221 is communicated with the second air inlet pipe 323, the refrigerating air flow in the second air inlet pipe 323 can enter the inner cavity 21 through the via hole 3221, and the battery assembly 1 is cooled, so that the battery cooling system 10 provided by the embodiment can perform multiple heat dissipation and cooling on the battery assembly 1, and further the battery cooling system 10 provided by the embodiment has a strong heat dissipation effect.

To ensure that the leading through hole 3221 and the second inlet pipe 323 can communicate when the pressure inside the expansion chamber 321 is high; when the pressure in the expansion cavity 321 is low, the piston assembly 322 can be reset, in the specific embodiment of this embodiment, the piston assembly 322 includes a moving member 3222 and an elastic member 3223, and the through hole 3221 is opened on the moving member 3222; the moving member 3222 is configured to move under the pressure of the gas when the gas in the expansion cavity 321 expands due to heat, so that at least a part of the via hole 3221 communicates with at least a part of the nozzle of the second gas inlet pipe 323; the elastic member 3223 is connected between the moving member 3222 and the expansion cavity 321, and the elastic member 3223 is used for resetting the moving member 3222 so that at least a part of the moving member 3222 blocks the nozzle of the second air inlet pipe 323.

Specifically, when the heat in the inner cavity 21 is transferred to the expansion cavity 321 through heat conduction, because the gas in the expansion cavity 321 is subjected to thermal expansion, the moving member 3222 moves toward the direction close to the second air inlet pipe 323 under the pressure of the gas, and when at least part of the via holes 3221 are communicated with at least part of the pipe orifices of the second air inlet pipe 323, the refrigerant gas flow in the second air inlet pipe 323 enters the inner cavity 21 through the via holes 3221, so as to cool the battery assembly 1; when the heat transferred from the inner cavity 21 to the expansion cavity 321 is less and less, the moving member 3222 is urged to return under the action of the elastic member 3223, at least a portion of the moving member 3222 blocks the nozzle of the second air inlet pipe 323, and the refrigerant air flow in the second air inlet pipe 323 cannot enter the inner cavity 21.

In some alternative embodiments, the moving member 3222 includes a position-limiting portion 32221 and a guiding portion 32222 connected in sequence, the position-limiting portion 32221 is located in the expansion cavity 321, and is in sliding fit with the expansion cavity 321; the expansion cavity 321 has a guide hole 3211 on a sidewall thereof, a guide portion 32222 slidably fits in the guide hole 3211, and a through hole 3221 is formed in the guide portion 32222.

In some embodiments, the elastic member 3223 is a spring, the spring is sleeved on the guiding portion 32222, one end of the spring is connected to the position-limiting portion 32221, and the other end of the spring is connected to the sidewall of the expansion cavity 321. The elastic member 3223 may be another component capable of urging the moving member 3222 to return, and the elastic member 3223 may be another elastic member capable of achieving the object of the present embodiment.

As shown in fig. 1 and 3, in order to provide heat conduction between the inner cavity 21 and the expansion cavity 321, in the present embodiment, the second heat dissipation assembly 32 further includes a heat conduction member 324, the heat conduction member 324 is disposed at a connection position of the expansion cavity 321 and the box body 2, and the heat conduction member 324 is used for conducting heat in the inner cavity 21 to the expansion cavity 321. Specifically, the heat conducting member 324 includes a heat exchange plate 3241 and a fin 3242, the heat exchange plate 3241 is connected to a side wall of the expansion cavity 321, an extending direction of the heat exchange plate 3241 is the same as an extending direction of a wall surface of the side wall of the expansion cavity 321, the fin 3242 is connected to the heat exchange plate 3241, the fin 3242 includes a first fin 3242a and a second fin 3242b, the first fin 3242a and the second fin 3242b are both multiple, the multiple first fins 3242a are located in the inner cavity 21, and the multiple second fins 3242b are located in the expansion cavity 321.

In some embodiments, the extending direction of the first fin 3242a coincides with the thickness direction of the case 2, the extending direction of the second fin 3242b coincides with the length direction of the case 2, and the plurality of first fins 3242a and the plurality of second fins 3242b are spaced apart from each other, so that the contact area between the heat conducting member 324 and the inner cavity 21 and between the heat conducting member 324 and the expansion cavity 321 can be increased by providing the plurality of first fins 3242a and the plurality of second fins 3242b, thereby improving the heat conduction efficiency of the heat conducting member 324.

In other embodiments, the extending direction of the first fin 3242a may be aligned with the longitudinal direction of the case 2, and the extending direction of the second fin 3242b may be aligned with the thickness direction of the case 2, and the extending directions of the first fin 3242a and the second fin 3242b are not particularly limited.

In order to determine the position of the moving member 3222 during the moving process, a corresponding detecting member is required to be arranged to detect the position of the moving member 3222. In a specific implementation manner of this embodiment, the second heat dissipation assembly 32 further includes a proximity switch 325, and the proximity switch 325 has a sensing surface, and the sensing surface is used for sensing the moving part 3222. Specifically, the distance between the moving member 3222 and the sensing surface is set to be H, and the sensing distance of the moving member 3222 is set to be H, so that when H is less than or equal to H, the sensing surface can sense the moving member 3222.

It should be noted that the proximity switch is a position switch that can be operated without mechanical direct contact with a moving part, and when the sensing surface of the object proximity switch reaches an actuation distance, the switch can be actuated without mechanical contact and any pressure applied, thereby driving a dc appliance or providing a control command to a computer (plc) device.

In order to enable the limiting portion 32221 to form a pressure difference at two ends of the moving direction thereof, so that the moving member 3222 can effectively move, in this embodiment, the expansion cavity 321 has a blocking portion 3212 therein, the blocking portion 3212 divides the expansion cavity 321 into a first expansion cavity 3213 and a second expansion cavity 3214, the second expansion cavity 3214 is located on a side of the first expansion cavity 3213 away from the box body 2, the blocking portion 3212 is provided with an air hole 32121, and the first expansion cavity 3213 is communicated with the second expansion cavity 3214 through the air hole 32121; the wall of the second expansion chamber 3214 is in sliding engagement with the first end of the displacement member 3222.

In this way, two sides of the moving member 3222 are abutted against the wall of the second expansion cavity 3214 to ensure that a pressure difference is formed between the upper and lower ends (in the direction of the drawing) of the limiting portion 32221, so that the moving member 3222 can effectively move to ensure the communication between the via hole 3221 and the second air inlet pipe 323.

In order to control the flow direction of the gas in the first gas inlet pipe 311 and prevent the gas from flowing back, in this embodiment, the first heat dissipation assembly 31 further includes a check valve 312, the check valve 312 is disposed on the first gas inlet pipe 311, and the check valve 312 is used to control the gas in the first gas inlet pipe 311 to flow into the inner cavity 21.

Specifically, when the check valve 312 is opened, the external gas can flow into the inner cavity 21 through the first air inlet pipe 311; when the check valve 312 is closed, the external air cannot flow into the inner cavity 21 through the first air inlet pipe 311.

In order to ensure the temperature of the air flow entering the box body 2 to be consistent and prevent the surface temperature of the battery assembly 1 from being uneven, in this embodiment, the first heat dissipation assembly 31 further includes a blocking member 313, the blocking member 313 is disposed in the inner cavity 21, the blocking member 313 divides the inner cavity 21 into a first chamber 211 and a second chamber 212, the first air inlet pipe 311 and the second air inlet pipe 323 are respectively communicated with the first chamber 211, and the battery assembly 1 is disposed in the second chamber 212; the barrier 313 has a plurality of heat dissipation holes 3131, and the first chamber 211 and the second chamber 212 are connected through the plurality of heat dissipation holes 3131.

Like this for first cavity 211 has the function of switching over the room, and in the back in first cavity 211 is got into to external gas or cold air current, can not flow into second cavity 212 fast, like this for the temperature of the air current that gets into in second cavity 212 through louvre 3131 is more unanimous, thereby can ensure battery pack 1 surface temperature's homogeneity, promotes battery pack 1's performance.

In some alternative embodiments, a third chamber 213 is further formed on the outer side wall of the box body 2, the third chamber 213 is located right below the expansion chamber 321, a communication hole 214 is formed on the outer side wall of the box body 2, the communication hole 214 communicates the third chamber 213 with the first chamber 211, and the first air inlet pipe 311 and the second air inlet pipe 323 communicate with the third chamber 213 respectively; a proximity switch 325 is disposed on a lower sidewall of the third chamber 213.

Furthermore, a side wall of the third chamber 213, which is away from the case 2, is further provided with a first vent hole 2131 and a second vent hole 2132, the first vent hole 2131 communicates with the first air inlet pipe 311 and the third chamber 213, and the second vent hole 2132 communicates with the second air inlet pipe 323 and the via hole 3221.

It should be noted that the cavity wall of the third chamber 213 may be fixedly disposed on the side wall of the box body 2, for example, by welding, and the cavity wall of the third chamber 213 may also be detachably connected to the side wall of the box body 2 by a threaded fastener, etc. Here, the connection manner between the chamber wall of the third chamber 213 and the case 2 is not particularly limited.

As shown in fig. 4, wherein the direction of the arrow is the flow direction of the air flow, the heat dissipation process of the battery heat dissipation system 10 provided in this embodiment to the battery assembly 1 is as follows, which is specifically divided into three stages:

the first stage is as follows: when the surface temperature of the battery assembly 1 is low and the generated heat is less, at this time, only the fan 4 needs to be started, and under the rotation action of the fan 4, the hot air flow of the second chamber 212 is conveyed to the outer side of the box body 2 through the mounting part 22;

and a second stage: when the surface temperature of the battery assembly 1 is high and the generated heat is high, not only the heat dissipation operation in the first stage is performed, but also the check valve 312 needs to be opened, at this time, the external air flow enters the third chamber 213 through the first air inlet pipe 311 and the second vent hole 2132, then enters the first chamber 211 through the vent hole 214, then enters the second chamber 212 through the plurality of heat dissipation holes 3131, and under the rotation action of the fan 4, the hot air flow in the second chamber 212 is conveyed to the outer side of the box body 2 through the mounting portion 22 to cool the battery assembly 1;

and a third stage: when the surface temperature of the battery assembly 1 is too high and the generated heat is too much, at this time, not only the heat dissipation operation of the first stage and the second stage is performed, but also the heat in the second chamber 212 is transferred to the first expansion cavity 3213 under the action of the heat conducting member 324, then the air temperature in the first expansion cavity 3213 rises and expands, and enters the second expansion cavity 3214 through the air hole 32121, so that the air temperature in the second expansion cavity 3214 rises and expands, so that the pressure above the limiting portion 32221 is greater than the pressure below the limiting portion 32221, thereby driving the moving member 3222 to move downward, when the distance between the lower end of the moving member 3222 and the sensing surface of the proximity switch 325 is less than or equal to the sensing distance of the sensing surface, that is, when at least part of the via hole 3221 is communicated with at least part of the second air inlet pipe 323, the cooling gas is introduced into the second air inlet pipe 323 under the action of the proximity switch 325, the cooling gas passes through the first vent hole 2131, the via hole 3221, the third chamber 213, the communication hole 214, the first chamber 211, and the plurality of heat dissipation holes 3131 in this order, and then flows into the second chamber 212, thereby cooling the battery assembly 1.

The battery cooling system provided by the embodiment comprises a battery component, a box body and a cooling component, wherein the box body is provided with an inner cavity, and the battery component is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly; the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity; the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall and the inner cavity of the expansion cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second intake pipe is used for letting in the refrigeration air current, and piston assembly has the conducting hole, and piston assembly is used for the gas at the expansion intracavity to be heated the inflation and remove to drive conducting hole and second intake pipe intercommunication, and carry the refrigeration air current to the inner chamber in from the second intake pipe. The battery cooling system that this embodiment provided has better radiating effect, can effectively dispel the heat to battery pack.

As shown in fig. 5, the embodiment further provides an electric vehicle 100, which includes an air conditioner 20, a controller 30 and the battery cooling system 10, where the air conditioner 20 has an air outlet pipe 201, the air outlet pipe 201 is communicated with a second air inlet pipe 323 of the battery cooling system 10, and the air conditioner 20 is electrically connected to the controller 30; the controller 30 is configured to control the air conditioner 20 to start when the via hole 3221 of the battery heat dissipation system 10 is communicated with the second air inlet pipe 323, so as to deliver the cooling air flow generated by the air conditioner 20 into the box 2 of the battery heat dissipation system 10 through the second air inlet pipe 323.

Specifically, the proximity switch 325 is electrically connected to the controller 30, and when the distance between the bottom end of the moving member 3222 and the sensing surface of the proximity switch 325 is less than or equal to the sensing distance of the sensing surface, the proximity switch 325 is turned on, and at this time, the controller 30 controls the air conditioner 20 to be started, so as to deliver the cooling airflow generated by the air conditioner 20 to the box 2 of the battery cooling system 10 through the second air inlet pipe 323.

It should be noted that the working process and principle of the battery heat dissipation system 10 have been described in detail in the above embodiments, and are not described herein again.

The electric automobile provided by the embodiment comprises an air conditioner, a controller and the battery cooling system, wherein the air conditioner is provided with an air outlet pipe which is communicated with a second air inlet pipe of the battery cooling system, and the air conditioner is electrically connected with the controller; the controller is used for controlling the air conditioner to start when the via hole of the battery cooling system is communicated with the second air inlet pipe so as to convey cooling air generated by the air conditioner to the box body of the battery cooling system through the second air inlet pipe, wherein the battery cooling system comprises a battery component, the box body and a cooling component, the box body is provided with an inner cavity, and the battery component is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly; the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity; the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall and the inner cavity of the expansion cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second intake pipe is used for letting in the refrigeration air current, and piston assembly has the conducting hole, and piston assembly is used for the gas at the expansion intracavity to be heated the inflation and remove to drive conducting hole and second intake pipe intercommunication, and carry the refrigeration air current to the inner chamber in from the second intake pipe. In the electric automobile that this embodiment provided, battery cooling system has better radiating effect, can effectively dispel the heat to battery pack to can promote electric automobile's performance.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery heat dissipation system is characterized by comprising a battery assembly, a box body and a heat dissipation assembly, wherein the box body is provided with an inner cavity, and the battery assembly is arranged in the inner cavity; the heat dissipation assembly comprises a first heat dissipation assembly and a second heat dissipation assembly;

the first radiating assembly comprises a first air inlet pipe, the first end of the first air inlet pipe is communicated with the outside atmosphere, and the second end of the first air inlet pipe is communicated with the inner cavity;

the second heat dissipation assembly comprises an expansion cavity, a piston assembly and a second air inlet pipe, the expansion cavity and the second air inlet pipe are both arranged on the box body, the cavity wall of the expansion cavity and the inner cavity are in heat conduction, and the piston assembly is in sliding fit with the expansion cavity; the second air inlet pipe is used for introducing refrigerating airflow, the piston assembly is provided with a conducting hole, and the piston assembly is used for enabling gas in the expansion cavity to move in a heating expansion mode so as to drive the conducting hole to be communicated with the second air inlet pipe and convey the refrigerating airflow into the inner cavity from the second air inlet pipe.

2. The battery heat dissipation system of claim 1, wherein the piston assembly comprises a moving member and an elastic member, and the via hole is formed in the moving member;

the moving piece is used for moving under the pressure of the gas when the gas in the expansion cavity is heated and expanded so as to enable at least part of the conducting hole to be communicated with at least part of the pipe orifice of the second air inlet pipe; the elastic piece is connected between the moving piece and the expansion cavity and used for enabling the moving piece to reset so that at least part of the moving piece can block the pipe orifice of the second air inlet pipe.

3. The battery cooling system according to claim 2, wherein the second cooling assembly further comprises a heat conducting member disposed at a junction of the expansion cavity and the case, the heat conducting member being configured to conduct heat in the inner cavity into the expansion cavity.

4. The battery heat dissipation system of claim 3, wherein the second heat dissipation assembly further comprises a proximity switch having an inductive surface for sensing the moving member.

5. The battery cooling system according to claim 4, wherein the expansion cavity is internally provided with a blocking portion, the blocking portion divides the expansion cavity into a first expansion cavity and a second expansion cavity, the second expansion cavity is located on one side of the first expansion cavity, which is far away from the box body, the blocking portion is provided with a vent hole, and the first expansion cavity and the second expansion cavity are communicated through the vent hole; the wall of the second expansion chamber is in sliding fit with the first end of the moving member.

6. The battery cooling system according to any one of claims 3-5, wherein the heat conducting member includes a heat exchange plate and a plurality of fins, the heat exchange plate is connected to the side wall of the expansion cavity and extends in the same direction as the wall surface of the side wall of the expansion cavity, the fins are connected to the heat exchange plate, the plurality of fins include a first fin and a second fin, and the first fin and the second fin are both plural, the plurality of first fins are located in the inner cavity, and the plurality of second fins are located in the expansion cavity.

7. The battery cooling system of any of claims 1-5, wherein the first cooling assembly further comprises a one-way valve disposed on the first air inlet tube, the one-way valve configured to control a flow of gas within the first air inlet tube into the internal cavity.

8. The battery cooling system according to any one of claims 2-5, wherein the first cooling assembly further comprises a partition disposed in the inner cavity, and the partition divides the inner cavity into a first chamber and a second chamber, the first air inlet pipe and the second air inlet pipe are respectively communicated with the first chamber, and the battery assembly is disposed in the second chamber; the blocking piece is provided with a plurality of heat dissipation holes, and the first cavity is communicated with the second cavity through the plurality of heat dissipation holes.

9. The battery cooling system according to any one of claims 1 to 5, further comprising a blower disposed on a top of the box, the blower being configured to convey the hot air flow in the inner cavity to outside the box.

10. An electric vehicle, characterized in that, the electric vehicle comprises an air conditioner, a controller and the battery heat dissipation system of any one of claims 1 to 9, the air conditioner is provided with an air outlet pipe, the air outlet pipe is communicated with a second air inlet pipe of the battery heat dissipation system, and the air conditioner is electrically connected with the controller;

the controller is used for controlling the air conditioner to be started when the conducting hole of the battery cooling system is communicated with the second air inlet pipe, so that refrigerating airflow generated by the air conditioner is conveyed to the box body of the battery cooling system through the second air inlet pipe.