Battery thermal management system, electric vehicle and battery heat control method

Abstract

The application provides a battery thermal management system, an electric vehicle and a battery heat control method. The battery thermal management system comprises: a power battery for storing electric energy; a heating device connected to the outer surface of the power battery, the heating device itself can generate heat to heat the power battery; a heat exchange assembly, part of the heat exchange assembly is connected to the outer surface of the power battery, the heat exchange assembly can exchange heat with the power battery to heat or cool the power battery; and a controller electrically connected with the heating device and the heat exchange assembly to control the working state of the heating device and the heat exchange assembly, the controller can control the heating device and / or the heat exchange assembly to heat the power battery according to the motion state of the electric vehicle, and the controller can also control the heat exchange assembly to cool the power battery. Through the technical scheme of the application, the power battery can be heated or cooled according to the working requirement, the control accuracy of the temperature is higher, and the working performance of the power battery can be prevented from being affected by the excessively high or low temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery thermal management of electric vehicles, in particular to a battery thermal management system, an electric vehicle and a battery heat control method. BACKGROUND

[0002] At present, electric vehicles have been widely used, and power batteries, as one of the key components of electric vehicles, are greatly affected by temperature in terms of working performance. Both high and low temperatures are not conducive to the normal work of power batteries, and thus affect the overall working state of electric vehicles. Most electric vehicles on the market use the method of adding a battery heat management system to control the temperature of power batteries. A low-temperature heating system for power batteries of a hybrid electric vehicle is provided in the prior art, which uses engine waste heat to heat the power battery to warm up the power battery at low temperature. However, the following problems exist in this scheme: the hot water pipe is directly arranged outside the power battery for heat exchange, and when the temperature of the cooling liquid flowing through the power battery is too high, it is easy to cause the service life of the power battery to decrease or the power battery to lose control; the power battery cannot be heated when the electric vehicle is not started; the power battery cannot be directly cooled in a high-temperature environment, and the heat dissipation effect is poor. SUMMARY

[0003] The present application aims to at least improve one of the technical problems existing in the prior art or related art.

[0004] To this end, one object of the present application is to provide a battery thermal management system.

[0005] Another object of the present application is to provide an electric vehicle.

[0006] Still another object of the present application is to provide a battery heat control method.

[0007] In order to achieve the above-mentioned objects, the first aspect of the present application provides a battery thermal management system for an electric vehicle, comprising: a power battery for storing electric energy; a heating device connected to the outer surface of the power battery, the heating device itself can generate heat to heat the power battery; a heat exchange assembly, part of the heat exchange assembly is connected to the outer surface of the power battery, the heat exchange assembly can exchange heat with the power battery to heat or cool the power battery; a controller electrically connected to the heating device and the heat exchange assembly to control the working state of the heating device and the heat exchange assembly, the controller can control the heating device and / or the heat exchange assembly to heat the power battery according to the motion state of the electric vehicle, and the controller can also control the heat exchange assembly to cool the power battery.

[0008] According to the first aspect of the present application, the battery thermal management system is used for the electric vehicle to control the heat of the power battery, so that the power battery can operate at a suitable temperature to maintain normal working performance. The battery thermal management system comprises a power battery, a heating device, a heat exchange assembly and a controller. The power battery is used for storing electric energy for use by the electric vehicle. The heating device is connected to the outer surface of the power battery and can generate heat to transfer heat to the power battery through contact with the power battery to heat the power battery. The heat exchange assembly is used for heating or cooling the power battery, wherein part of the heat exchange assembly is connected to the outer surface of the power battery and can exchange heat with the power battery, and the heat exchange assembly heats the power battery when transferring heat to the power battery and cools the power battery when absorbing heat from the power battery. The controller is electrically connected to the heating device and the heat exchange assembly to control the working state of the heating device and the heat exchange assembly to heat or cool the power battery according to the working needs of the power battery to keep the power battery operating at a suitable temperature.

[0009] When the power battery needs to be heated, the controller controls the heating device or the heat exchange assembly to work according to the motion state of the electric vehicle to heat the power battery. The motion state includes a driving state and a stationary state, wherein the stationary state includes parking and charging. Specifically, the heating device can be controlled to heat the power battery when the electric vehicle is in a stationary state, and the heat exchange assembly can be controlled to heat the power battery when the electric vehicle is in a driving state. Of course, the heating device and the heat exchange assembly can also be controlled to heat the power battery at the same time. When the power battery needs to be cooled, the controller controls the heat exchange assembly to cool and dissipate heat from the power battery.

[0010] The battery thermal management system in this scheme can heat or cool the power battery according to the working needs of the power battery, effectively control the temperature of the power battery, and make the power battery operate at a suitable temperature to prevent the working performance of the power battery from being affected by excessively high or low temperature, thereby prolonging the service life of the power battery. At the same time, different heating devices can be used according to the motion state of the electric vehicle when heating the power battery, which is beneficial to the rational use of energy.

[0011] It can be understood that the working performance of the power battery is greatly affected by temperature, and excessively low temperature can easily lead to a decrease in the working performance of the power battery, affecting the power performance and cruising range of the electric vehicle, while excessively high temperature can easily lead to a decrease in the service life of the power battery, and even overheat failure. The battery thermal management system in this scheme can effectively alleviate the above problems.

[0012] In addition, the battery thermal management system in the above technical solution provided by the present application can also have the following additional technical features:

[0013] In the technical scheme, the heat exchange assembly comprises: a heat exchange device connected to the outer surface of the power battery, the heat exchange device storing battery cooling liquid therein, and used for heat exchange with the power battery; a first heat exchange system in communication with the heat exchange device, the first heat exchange system being capable of obtaining heat of a drive system of the electric vehicle and releasing heat of the battery cooling liquid to heat the battery cooling liquid, so that the battery cooling liquid releases heat to the power battery when flowing through the power battery, thereby achieving heating of the power battery; and a second heat exchange system in communication with the heat exchange device, the second heat exchange system being capable of absorbing heat of the battery cooling liquid, so that the battery cooling liquid absorbs heat of the power battery when flowing through the power battery, thereby achieving cooling of the power battery, wherein the controller is electrically connected with the first heat exchange system and the second heat exchange system to control operation of the first heat exchange system and the second heat exchange system.

[0014] In the technical scheme, the heat exchange assembly comprises: a heat exchange device connected to the outer surface of the power battery, the heat exchange device storing battery cooling liquid therein, and used for heat exchange with the power battery; a first heat exchange system in communication with the heat exchange device, the first heat exchange system being capable of obtaining heat of a drive system of the electric vehicle and releasing heat of the battery cooling liquid to heat the battery cooling liquid, so that the battery cooling liquid releases heat to the power battery when flowing through the power battery, thereby achieving heating of the power battery; and a second heat exchange system in communication with the heat exchange device, the second heat exchange system being capable of absorbing heat of the battery cooling liquid, so that the battery cooling liquid absorbs heat of the power battery when flowing through the power battery, thereby achieving cooling of the power battery, wherein the controller is electrically connected with the first heat exchange system and the second heat exchange system to control operation of the first heat exchange system and the second heat exchange system.

[0015] It should be noted that the drive system comprises an electric vehicle drive motor, a motor controller and an integrated auxiliary controller, and when the electric vehicle is provided with the upper loading mechanism, the drive system further comprises an upper loading motor and an upper loading motor controller.

[0016] In the technical scheme, the first heat exchange system comprises: a heat dissipation circulation pipeline, a radiator is arranged in the heat dissipation circulation pipeline, and the cooling liquid in the heat dissipation circulation pipeline flows through the drive system of the electric vehicle and the radiator to dissipate heat of the drive system; the first heat exchanger is provided with a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is connected to both ends of the heat exchange device through a common pipeline, and the second heat exchange pipeline is connected to the heat dissipation circulation pipeline; the first electromagnetic valve is arranged in the first heat exchange pipeline, and the first electromagnetic valve is electrically connected with the controller to open or close the first heat exchange pipeline according to the control instruction of the controller; the first water pump is arranged in the first heat exchange pipeline and the common pipeline of the heat exchange device connected to the second heat exchange system to drive the battery cooling liquid to flow; and the second water pump is arranged in the heat dissipation circulation pipeline to drive the cooling liquid in the heat dissipation circulation pipeline to flow, wherein the first water pump is arranged in the common pipeline of the first heat exchange pipeline and the heat exchange device connected to the second heat exchange system, the cooling liquid in the heat dissipation circulation pipeline can flow into the second heat exchange pipeline, and the battery cooling liquid in the first heat exchange pipeline and the cooling liquid in the second heat exchange pipeline exchange heat through the first heat exchanger to increase the temperature of the battery cooling liquid.

[0017] In the technical scheme, the first heat exchange system comprises: a heat dissipation circulation pipeline, a radiator is arranged in the heat dissipation circulation pipeline, and the cooling liquid in the heat dissipation circulation pipeline flows through the drive system of the electric vehicle and the radiator to dissipate heat of the drive system; the first heat exchanger is provided with a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is connected to both ends of the heat exchange device through a common pipeline, and the second heat exchange pipeline is connected to the heat dissipation circulation pipeline; the first electromagnetic valve is arranged in the first heat exchange pipeline, and the first electromagnetic valve is electrically connected with the controller to open or close the first heat exchange pipeline according to the control instruction of the controller; the first water pump is arranged in the first heat exchange pipeline and the common pipeline of the heat exchange device connected to the second heat exchange system to drive the battery cooling liquid to flow; and the second water pump is arranged in the heat dissipation circulation pipeline to drive the cooling liquid in the heat dissipation circulation pipeline to flow, wherein the first water pump is arranged in the common pipeline of the first heat exchange pipeline and the heat exchange device connected to the second heat exchange system, the cooling liquid in the heat dissipation circulation pipeline can flow into the second heat exchange pipeline, and the battery cooling liquid in the first heat exchange pipeline and the cooling liquid in the second heat exchange pipeline exchange heat through the first heat exchanger to increase the temperature of the battery cooling liquid.

[0018] The power battery in the scheme directly exchanges heat with the first heat exchange pipeline and the second heat exchange pipeline to obtain heat, is not directly connected with the heat dissipation circulating pipeline, can reduce the resistance in the pipeline, can select a water pump with small lift, is conducive to reducing the equipment cost. At the same time, the cooling liquid in the heat dissipation circulating pipeline first passes through the radiator and then exchanges heat with the first heat exchange pipeline, so that the temperature of the cooling liquid can meet the heating condition of the power battery, and the working performance and service life of the power battery are prevented from being affected by the high temperature of the cooling liquid. It can be understood that if the cooling liquid directly heats the power battery without passing through the radiator, the temperature of the cooling liquid is not easy to control, and it is impossible to ensure that the driving system has sufficient heat dissipation conditions.

[0019] In the above technical scheme, the second heat exchange system comprises: a second heat exchanger provided with a third heat exchange pipeline and a fourth heat exchange pipeline, two ends of the third heat exchange pipeline being connected to two ends of the common pipeline; a second electromagnetic valve arranged in the third heat exchange pipeline, the second electromagnetic valve being electrically connected to the controller to open or close the third heat exchange pipeline according to the control instruction of the controller; a condenser arranged in the fourth heat exchange pipeline, for condensing the refrigerant in the fourth heat exchange pipeline; and an electric compressor arranged in the fourth heat exchange pipeline, for pressurizing the refrigerant to form high-pressure gaseous cooling liquid, wherein the refrigerant can circulate in the fourth heat exchange pipeline and exchange heat with the battery cooling liquid in the third heat exchange pipeline through the second heat exchanger, so as to cool the battery cooling liquid.

[0020] In the above technical scheme, the second heat exchange system comprises: a second heat exchanger provided with a third heat exchange pipeline and a fourth heat exchange pipeline, two ends of the third heat exchange pipeline being connected to two ends of the common pipeline; a second electromagnetic valve arranged in the third heat exchange pipeline, the second electromagnetic valve being electrically connected to the controller to open or close the third heat exchange pipeline according to the control instruction of the controller; a condenser arranged in the fourth heat exchange pipeline, for condensing the refrigerant in the fourth heat exchange pipeline; and an electric compressor arranged in the fourth heat exchange pipeline, for pressurizing the refrigerant to form high-pressure gaseous cooling liquid, wherein the refrigerant can circulate in the fourth heat exchange pipeline and exchange heat with the battery cooling liquid in the third heat exchange pipeline through the second heat exchanger, so as to cool the battery cooling liquid.

[0021] In the technical solution, the heat dissipation circulation pipeline further comprises a three-way valve arranged at the connection between the second heat exchange pipeline and the heat dissipation circulation pipeline, the first valve port and the second valve port of the three-way valve are connected to the heat dissipation circulation pipeline, and the third valve port of the three-way valve is connected to the second heat exchange pipeline, wherein the controller is electrically connected to the three-way valve and controls the operation of the three-way valve to control the connection state of the second heat exchange pipeline and the heat dissipation circulation pipeline.

[0022] In the technical solution, the three-way valve is arranged at the connection between the second heat exchange pipeline and the heat dissipation circulation pipeline to control the connection and disconnection of the second heat exchange pipeline and the heat dissipation circulation pipeline. The three-way valve is provided with a first valve port, a second valve port and a third valve port, the first valve port and the second valve port are connected to the heat dissipation circulation pipeline, and the third valve port is connected to the second heat exchange system. The three-way valve is electrically connected to the controller to operate according to the control instruction of the controller. When the first valve port and the second valve port are connected and the third valve port is closed, the second heat exchange pipeline is disconnected from the heat dissipation circulation pipeline, and the cooling liquid does not flow through the second heat exchange pipeline. When the first valve port and the third valve port are connected and the second valve port is closed, the cooling liquid in the heat dissipation circulation pipeline flows into the second heat exchange pipeline after passing through the three-way valve, and the cooling liquid flows back to the heat dissipation circulation pipeline from the other end of the second heat exchange pipeline after passing through the first heat exchanger. When the first valve port, the second valve port and the third valve port are all connected, the cooling liquid in the heat dissipation circulation pipeline flows through the three-way valve, part of the cooling liquid continues to flow in the heat dissipation circulation pipeline, and the other part of the cooling liquid flows into the second heat exchange pipeline and flows back to the heat dissipation circulation pipeline from the other end of the second heat exchange pipeline after passing through the first heat exchanger, so as to adjust the flow of the cooling liquid flowing into the second heat exchange pipeline. When the cooling liquid flows through the first heat exchanger, the battery cooling liquid in the first heat exchange pipeline is heated to heat the power battery.

[0023] In the technical solution, the first heat exchange system further comprises a third electromagnetic valve arranged in the second heat exchange pipeline and a fourth electromagnetic valve arranged in the heat dissipation circulation pipeline at a pipeline section between the two connection points of the second heat exchange pipeline, wherein the controller is electrically connected to the third electromagnetic valve and the fourth electromagnetic valve to control the operation of the third electromagnetic valve and the fourth electromagnetic valve.

[0024] In the technical solution, the first heat exchange system further comprises a third electromagnetic valve and a fourth electromagnetic valve. The third electromagnetic valve is arranged in the second heat exchange pipeline to switch on or shut off the second heat exchange pipeline. The fourth electromagnetic valve is arranged in a pipeline segment between the two access points of the second heat exchange pipeline in the heat dissipation circulation pipeline to switch on or shut off the heat dissipation circulation pipeline. The third electromagnetic valve and the fourth electromagnetic valve are electrically connected with the controller to operate according to the control instruction of the controller. When the third electromagnetic valve is closed and the fourth electromagnetic valve is switched on, the cooling liquid in the heat dissipation circulation pipeline does not flow into the second heat exchange pipeline. When the third electromagnetic valve is switched on and the fourth electromagnetic valve is closed, the cooling liquid in the heat dissipation circulation pipeline flows through the second heat exchange pipeline. When the third electromagnetic valve and the fourth electromagnetic valve are switched on at the same time, part of the cooling liquid in the heat dissipation circulation pipeline flows into the second heat exchange pipeline, and the other part continues to flow in the heat dissipation circulation pipeline, so as to adjust the flow of the cooling liquid flowing into the second heat exchange pipeline. When the cooling liquid flows through the first heat exchanger, it exchanges heat with the battery cooling liquid in the first heat exchange pipeline, so that the battery cooling liquid is warmed up to facilitate heating of the power battery.

[0025] In the above technical solution, the heating device is a heating film; and / or the heat exchange device is a liquid cooling plate; and / or the battery thermal management system further comprises a temperature detector arranged on the power battery and configured to detect the temperature of the power battery, the temperature detector being electrically connected with the controller to send a temperature signal of the power battery to the controller.

[0026] In the technical solution, the heating device is specifically a heating film which is pasted on the outer surface of the power battery. The heating film is electrically connected with the controller and can be controlled electrically to release heat to the power battery by self-heating when the electric vehicle is in a stationary state. The heat exchange device is specifically a liquid cooling plate which internally stores cooling liquid and is configured to exchange heat. The cooling liquid can flow through the first heat exchange system or the second heat exchange system to release the heat obtained from the first heat exchange system to the power battery to warm up the power battery, or release the heat obtained from the power battery to the outside through the second heat exchange system to cool down the power battery. The battery thermal management system further comprises a temperature detector arranged on the power battery to detect the temperature of the power battery. The temperature detector is electrically connected with the controller and sends a temperature signal of the power battery to the controller, so that the controller can perform corresponding control operations according to the temperature of the power battery.

[0027] In the second aspect of the present application, an electric vehicle is provided, comprising: a vehicle body; a driving system arranged in the vehicle body and configured to drive the vehicle body to travel; a battery thermal management system according to any one of the first aspect of the present application arranged in the vehicle body, and the power battery in the battery thermal management system being electrically connected with the driving system to supply power to the driving system.

[0028] According to the second aspect of the present application, the electric vehicle comprises a vehicle body, a driving system and the battery thermal management system of any one of the first aspect. The driving system is arranged in the vehicle body and is in transmission connection with a running mechanism of the vehicle body to drive the running mechanism to operate and realize the running of the vehicle body. The power battery in the battery thermal management system is electrically connected with the driving system to supply power to the driving system through the power battery. The battery thermal management system can heat or cool the power battery. When the power battery needs to be heated, the controller can control different heating devices according to different motion states of the vehicle body, and control the heat exchange assembly to heat the power battery when the vehicle body is in a running state, and control the heating device to heat the power battery by itself when the vehicle body is in a stationary state.

[0029] Further, the electric vehicle is an electric mixer truck. The driving system comprises a driving motor, a motor controller and an integrated auxiliary controller. The driving motor is in transmission connection with the running mechanism of the vehicle body to drive the vehicle body to run. The motor controller is electrically connected with the driving motor to control the driving motor to operate. The integrated auxiliary controller is used to control a plurality of auxiliary systems of the electric vehicle to operate, such as a four-in-one controller. When the electric mixer truck is provided with an upper loading mechanism, the driving system can further comprise an upper loading motor. The heat exchange assembly in the battery thermal management system is assembled with the driving motor, the motor controller and the integrated auxiliary controller to absorb the heat generated during operation, which can not only cool the above components of the driving system, but also utilize the heat generated during the operation of the above components of the driving system to heat the power battery, so as to realize the recycling of heat and improve the energy utilization efficiency.

[0030] In addition, the electric vehicle in the present application also has all the technical effects of the battery thermal management system of any one of the first aspect, which will not be repeated here.

[0031] The third aspect of the present application provides a battery heat control method for the battery thermal management system of any one of the first aspect. The battery heat control method comprises: step S100, receiving a heat control instruction corresponding to the power battery; step S200, determining whether the heat control instruction is a heating instruction or a cooling instruction; if the heat control instruction is a heating instruction, step S300 is executed to control the heating device and / or the heat exchange assembly to work according to the motion state of the electric vehicle to heat the power battery; if the heat control instruction is a cooling instruction, step S400 is executed to control the heat exchange assembly to work to cool the power battery.

[0032] According to the third aspect of the present application, the battery heat control method comprises steps S100 to S400. When receiving the heat control instruction corresponding to the power battery, the heat demand of the power battery at this time is determined through step S200, i.e. whether heating or cooling is needed, so as to facilitate subsequent corresponding control operation according to the heat control instruction. When the heat control instruction is a heating instruction, the heating device and / or the heat exchange assembly are controlled to work according to the motion state of the electric vehicle through step S300, so as to heat the power battery through different heating modes, so as to make the temperature of the power battery rise, and especially in a low temperature environment, the power battery can maintain normal working performance. When the heat control instruction is a cooling instruction, the heat exchange assembly is controlled to work through step S400, so as to make the temperature of the power battery drop, so as to realize the cooling of the power battery, and prevent the power battery from being affected by the high temperature and affecting the working performance.

[0033] In addition, the battery heat control method in the present application also has all the beneficial effects of the battery heat management system in any one of the first aspect of the present application, which will not be repeated here.

[0034] In the above technical solution, step S300: controlling the heating device and / or the heat exchange assembly to work according to the motion state of the electric vehicle to heat the power battery, specifically comprising: step S310: judging whether the motion state of the electric vehicle is a static state, and generating a first judgment result; if the first judgment result is yes, executing step S320: controlling the heating device to work to heat the power battery; if the first judgment result is no, executing step S330: controlling the heat exchange assembly to work or controlling the heat exchange assembly and the heating device to work simultaneously to heat the power battery.

[0035] In the technical solution, in step S300, whether the motion state of the electric vehicle is a static state is judged, i.e. whether the electric vehicle is currently in a static state or a running state is determined, and a first judgment result is generated. If the first judgment result is yes, i.e. the electric vehicle is in a static state at this time, including parking and charging, the heating device is controlled to work at this time through step S320, so as to heat the power battery through the heat generated by the heating device itself, so as to make the power battery warm up. If the first judgment result is no, the heat exchange assembly is controlled to work or the heat exchange assembly and the heating device are controlled to work simultaneously through step S330, so as to heat the power battery by using the heat generated by the driving system during the running of the electric vehicle, so as to make the power battery warm up. Of course, at this time, the heating device and the heat exchange assembly can also be controlled to heat the power battery simultaneously.

[0036] Additional aspects and advantages of the present application will become apparent in the following description section, or can be understood by practicing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0038] Figure 1 A schematic block diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0039] Figure 2 A schematic block diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0040] Figure 3 A schematic block diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0042] Figure 5 A schematic diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0043] Figure 6 A schematic diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0044] Figure 7 A schematic diagram of a battery thermal management system according to one embodiment of the present application is shown;

[0045] Figure 8 A schematic block diagram of an electric vehicle according to one embodiment of the present application is shown;

[0046] Figure 9 A schematic block diagram of an electric vehicle according to one embodiment of the present application is shown;

[0047] Figure 10 A flowchart of a battery thermal control method according to one embodiment of the present application is shown;

[0048] Figure 11 A flowchart of a battery thermal control method according to one embodiment of the present application is shown.

[0049] wherein, Figures 4 to 7 The arrows in the figure indicate the flow direction of the coolant.

[0050] Figures 1 to 9 The correspondence between the reference numerals and the components in the figure is as follows:

[0051] 1 battery thermal management system, 11 power battery, 12 heat generating device, 13 heat exchange assembly, 131 heat exchange device, 132 first heat exchange system, 1321 heat dissipation circulation pipeline, 1322 first heat exchanger, 1323 first heat exchange pipeline, 1324 second heat exchange pipeline, 1325 radiator, 1326 first electromagnetic valve, 1327 first water pump, 1328 second water pump, 133 second heat exchange system, 1331 second heat exchanger, 1332 third heat exchange pipeline, 1333 fourth heat exchange pipeline, 1334 condenser, 1335 electric compressor, 1336 second electromagnetic valve, 134 common pipeline, 1361 first three-way valve, 1362 second three-way valve, 1363 third electromagnetic valve, 1364 fourth electromagnetic valve, 14 controller, 15 temperature detector, 2 electric vehicle, 21 vehicle body, 22 drive system, 221 drive motor, 222 motor controller, 223 integrated auxiliary controller. DETAILED DESCRIPTION

[0052] In order to enable more clear understanding of the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0053] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can be practiced in other manners different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0054] The following refers to Figures 1 to 11 The battery thermal management system, electric vehicle and battery heat control method of some embodiments of the present application are described.

[0055] Embodiment one

[0056] A battery thermal management system 1 for an electric vehicle is provided in the present embodiment, which can control the heat of the power battery 11 of the electric vehicle, so that the power battery 11 can operate at a suitable temperature to maintain normal working performance.

[0057] As Figure 1As shown, the battery thermal management system 1 comprises a power battery 11, a heating device 12, a heat exchange assembly 13 and a controller 14. The power battery 11 is used to store and supply electric energy required for the operation of the electric vehicle. The heating device 12 is connected to the outer surface of the power battery 11; the heating device 12 can transfer heat to the power battery 11 by self-heating to heat the power battery 11, and the heating device 12 consumes the power battery 11 itself or sacrifices the charging current to heat the power battery 11. The heat exchange assembly 13 can heat or cool the power battery 11; part of the heat exchange assembly 13 is connected to the outer surface of the power battery 11 to exchange heat with the power battery 11 when the heat exchange assembly 13 works, wherein the heat exchange assembly 13 heats the power battery 11 when transferring heat to the power battery 11 to heat the power battery 11, and the heat exchange assembly 13 cools the power battery 11 when absorbing heat from the power battery 11 to cool the power battery 11. When the battery thermal management system 1 is assembled on the electric vehicle, part of the heat exchange assembly 13 can be arranged to contact or be close to the drive system of the electric vehicle to absorb heat generated by the drive system when working, which is used to heat the power battery 11.

[0058] The controller 14 is electrically connected to the heating device 12 and the heat exchange assembly 13 to control the working state of the heating device 12 and the heat exchange assembly 13 according to the working needs of the power battery 11, so as to heat or cool the power battery 11 to keep the power battery 11 running at a suitable temperature. When the temperature of the power battery 11 is too low, the controller 14 controls the heating device 12 or the heat exchange assembly 13 to work according to the motion state of the electric vehicle to heat the power battery 11; when the temperature of the power battery 11 is too high, the controller 14 controls the heat exchange assembly 13 to work to cool the power battery 11. The motion state of the electric vehicle includes driving state and static state, and the static state includes parking and charging. Specifically, the heating device 12 can be controlled to heat the power battery 11 when the electric vehicle is in the static state, and the heat exchange assembly 13 can be controlled to heat the power battery when the electric vehicle is in the driving state. Of course, the heating device 12 and the heat exchange assembly 13 can also be controlled to heat the power battery 11 at the same time.

[0059] The battery thermal management system 1 in the embodiment can take corresponding control measures according to the temperature of the power battery 11 to heat or cool the power battery 11 according to the working needs, so that the power battery 11 can run at a suitable temperature to meet the driving needs of the electric vehicle in different environments, and prevent the power battery 11 from affecting the working performance due to too high or too low temperature. In addition, different heating measures can be adopted according to the motion state of the electric vehicle when heating the power battery 11, which is beneficial to the rational use of energy.

[0060] Embodiment two

[0061] The battery thermal management system 1 provided in this embodiment is further improved on the basis of embodiment one.

[0062] As shown in Figure 2 The heat exchange assembly 13 includes a heat exchange device 131, a first heat exchange system 132, and a second heat exchange system 133. The heat exchange device 131 is used for heat exchange with the power battery 11. The heat exchange device 131 is connected with the power battery 11 and in contact with the outer surface of the power battery 11. The heat exchange device 131 stores battery coolant that can exchange heat with the power battery 11. The first heat exchange system 132 and the second heat exchange system 133 are both in communication with the heat exchange device 131 and are respectively used for heating the power battery 11 and cooling the power battery 11. The first heat exchange system 132 is in contact with or close to the drive system of the electric vehicle through a pipeline and can obtain heat from the drive system through the flow of the coolant. The heat is exchanged between the coolant and the battery coolant in the heat exchange device 131 to recover and utilize the heat of the drive system and transfer the heat to the battery coolant to heat the power battery 11 when the temperature of the power battery 11 is too low. The second heat exchange system 133 can exchange heat with the battery coolant in the heat exchange device 131 to absorb the heat of the battery coolant to cool the power battery 11 through the battery coolant when the temperature of the power battery 11 is too high. The controller 14 is electrically connected with the first heat exchange system 132 and the second heat exchange system 133 to control the operating state of the first heat exchange system 132 and the second heat exchange system 133.

[0063] It should be noted that the drive system includes the electric vehicle drive motor, the motor controller, and the integrated auxiliary controller. When the electric vehicle is provided with the roof mechanism, the drive system can further include the roof motor and the roof motor controller.

[0064] Embodiment three

[0065] The battery thermal management system 1 provided in this embodiment is further improved on the basis of embodiment two.

[0066] The heating device 12 is specifically a heating film that is pasted on the outer surface of the power battery 11. The heating film is electrically connected with the controller 14 and can be electrically controlled to release heat to the power battery 11 through self-heating of the heating film when the electric vehicle is in a stationary state.

[0067] The heat exchange device 131 is a liquid cooling plate that stores coolant inside for heat exchange. The coolant can flow through the first heat exchange system 132 or the second heat exchange system 133 to release the heat obtained from the first heat exchange system 132 to the power battery 11 to warm up the power battery 11 or release the heat obtained from the power battery 11 to the outside through the second heat exchange system 133 to cool down the power battery 11.

[0068] Further, as shown in Figure 3 The battery thermal management system 1 further comprises a temperature detector 15 arranged on the power battery 11 to detect the temperature of the power battery 11. The temperature detector 15 is electrically connected with the controller 14 and sends the temperature signal of the power battery 11 to the controller 14, so that the controller 14 can perform corresponding control operation according to the temperature of the power battery 11.

[0069] Embodiment Four

[0070] The battery thermal management system 1 provided in this embodiment is further improved on the basis of the embodiment two.

[0071] As shown in Figure 4 The first heat exchange system 132 specifically comprises a heat dissipation circulation pipeline 1321, a first heat exchanger 1322, a first electromagnetic valve 1326, a first water pump 1327 and a second water pump 1328. The heat dissipation circulation pipeline 1321 is provided with a radiator 1325 and the second water pump 1328, and the cooling liquid in the heat dissipation circulation pipeline 1321 is driven to circulate by the second water pump 1328. The heat dissipation circulation pipeline 1321 is in contact with or close to the drive system of the electric vehicle, so as to absorb the heat transmitted in the working process of the drive system by the cooling liquid, and release part of the heat when flowing through the radiator 1325, thereby achieving heat dissipation of the drive system, ensuring that the temperature of the cooling liquid meets the condition of heating the power battery 11, and preventing the temperature of the cooling liquid from being too high to affect the working performance and service life of the power battery 11.

[0072] The first heat exchanger 1322 is provided with a first heat exchange pipeline 1323 and a second heat exchange pipeline 1324. Two ends of the first heat exchange pipeline 1323 are connected to two ends of the heat exchange device 131 through a common pipeline 134, so that the battery cooling liquid in the heat exchange device 131 can flow through the first heat exchanger 1322 through the first heat exchange pipeline 1323; the common pipeline 134 is provided with a first water pump 1327 for driving the battery cooling liquid in the heat exchange device 131 to circulate in the common pipeline 134 and the first heat exchange pipeline 1323; the second heat exchange system 133 is also connected to the two ends of the heat exchange device 131 through the common pipeline 134, which is beneficial to simplify the connection. Two ends of the second heat exchange pipeline 1324 are connected to the heat dissipation circulation pipeline 1321, so that the second heat exchange pipeline 1324 and part of the pipeline of the heat dissipation circulation pipeline 1321 are connected in parallel, so that the cooling liquid in the heat dissipation circulation pipeline 1321 can flow through the first heat exchanger 1322 through the second heat exchange pipeline 1324, and exchange heat with the battery cooling liquid in the first heat exchange pipeline 1323 in the first heat exchanger 1322, so that the temperature of the battery cooling liquid is increased, and then the heat is released to the power battery 11 when the battery cooling liquid flows back to the heat exchange device 131, so as to heat the power battery 11. Among them, the cooling liquid in the heat dissipation circulation pipeline 1321 is cooled by the radiator 1325, and a part of the heat is released, which can prevent the cooling liquid flowing into the second heat exchange pipeline 1324 from being too high to cause excessive heating of the power battery 11, so as to alleviate the influence of high temperature on the working performance of the power battery 11, and reduce the possibility of high-temperature failure of the power battery 11.

[0073] The first heat exchange pipeline 1323 is provided with a first electromagnetic valve 1326 for opening or closing the first heat exchange pipeline 1323. The connection between the second heat exchange pipeline 1324 and the heat dissipation circulation pipeline 1321 is provided with a first three-way valve 1361, the first valve port and the second valve port of the first three-way valve 1361 are connected to the heat dissipation circulation pipeline 1321 respectively, and the third valve port is connected to the second heat exchange pipeline 1324, so that the second heat exchange pipeline 1324 and the heat dissipation circulation pipeline 1321 are connected or closed. The controller 14 is electrically connected with the first electromagnetic valve 1326 and the first three-way valve 1361, so as to control the operation of the first electromagnetic valve 1326 and the first three-way valve 1361.

[0074] When the first heat exchange system 132 is working, the first electromagnetic valve 1326 is turned on, and the first valve port and the third valve port of the first three-way valve 1361 are connected to make the cooling liquid in the heat dissipation circulation system flow through the second heat exchange pipeline 1324, and release heat to the battery cooling liquid in the first heat exchange pipeline 1323, and the battery cooling liquid after absorbing heat flows back to the heat exchange device 131 to heat the power battery 11. When the second valve port and the first valve port of the first three-way valve 1361 are connected, part of the cooling liquid in the heat dissipation circulation pipeline 1321 flows through the second heat exchange pipeline 1324; when the second valve port and the first valve port of the first three-way valve 1361 are disconnected, all of the cooling liquid in the heat dissipation circulation pipeline 1321 flows through the second heat exchange pipeline 1324 to realize the flow control of the cooling liquid in the second heat exchange pipeline 1324.

[0075] Figure 5 Another implementation of the battery thermal management system 1 in the embodiment is shown, which uses a third electromagnetic valve 1363 and a fourth electromagnetic valve 1364 instead of the first three-way valve 1361. The third electromagnetic valve 1363 is arranged in the second heat exchange pipeline 1324, and the fourth electromagnetic valve 1364 is arranged in the part of the heat dissipation circulation pipeline 1321 between the two ends of the second heat exchange pipeline 1324. When the first heat exchange system 132 is working, the first electromagnetic valve 1326 and the third electromagnetic valve 1363 are turned on to make the cooling liquid in the heat dissipation circulation pipeline 1321 flow through the second heat exchange pipeline 1324; when the fourth electromagnetic valve 1364 is turned on, part of the cooling liquid in the heat dissipation circulation pipeline 1321 flows through the second heat exchange pipeline 1324; and when the fourth electromagnetic valve 1364 is disconnected, all of the cooling liquid in the heat dissipation circulation pipeline 1321 flows through the second heat exchange pipeline 1324.

[0076] Embodiment five

[0077] The battery thermal management system 1 provided in the embodiment is further improved on the basis of the embodiment four.

[0078] As Figure 6As shown, the second heat exchange system 133 includes a second heat exchanger 1331, a second electromagnetic valve 1336, a condenser 1334 and an electric compressor 1335. The second heat exchanger 1331 is provided with a third heat exchange pipeline 1332 and a fourth heat exchange pipeline 1333. The third heat exchange pipeline 1332 is connected to both ends of the common pipeline 134, and the battery coolant in the heat exchange device 131 can flow through the second heat exchanger 1331 through the third heat exchange pipeline 1332 under the drive of the first water pump 1327, and circulate in the common pipeline 134 and the third heat exchange pipeline 1332. The second electromagnetic valve 1336 electrically connected to the controller 14 is arranged in the third heat exchange pipeline 1332, and is used to turn on or close the third heat exchange pipeline 1332 according to the control instruction of the controller 14. The condenser 1334 and the electric compressor 1335 are arranged in the fourth heat exchange pipeline 1333. The condenser 1334 stores refrigerant, and the refrigerant can flow through the second heat exchanger 1331 through the fourth heat exchange pipeline 1333. The refrigerant in the fourth heat exchange pipeline 1333 is pressurized by the electric compressor 1335 to form high-pressure gaseous refrigerant. When the high-pressure gaseous refrigerant flows into the condenser 1334, it is condensed and releases heat, and releases heat to the outside, and again forms low-temperature and low-pressure liquid refrigerant. When the low-temperature and low-pressure liquid refrigerant flows through the second heat exchanger 1331, it exchanges heat with the battery coolant in the third heat exchange pipeline 1332, absorbs the heat of the battery coolant and returns to the electric compressor 1335. When the cooled battery coolant flows back to the heat exchange device 131, it absorbs the heat of the power battery 11, and cools the power battery 11.

[0079] Figure 7 Another implementation of the battery thermal management system 1 in the embodiment is shown. A second three-way valve 1362 is arranged at the position where the first heat exchange pipeline 1323 and the third heat exchange pipeline 1332 access the common pipeline 134, to replace the first electromagnetic valve 1326 and the second electromagnetic valve 1336. The first valve port of the second three-way valve 1362 is connected to the first heat exchange pipeline 1323, the second valve port of the second three-way valve 1362 is connected to the third heat exchange pipeline 1332, and the third valve port is connected to the common pipeline 134, so that when the first valve port and the third valve port are turned on, the first heat exchange pipeline 1323 is in communication with the common pipeline 134, and when the second valve port and the third valve port are turned on, the third heat exchange pipeline 1332 is in communication with the common pipeline 134. The second three-way valve 1362 is electrically connected to the controller 14, and is used to operate according to the control instruction of the controller 14.

[0080] Embodiment six

[0081] A battery thermal management system 1 is provided in the embodiment, which is used for an electric vehicle and can control the heat of the power battery 11 of the electric vehicle.

[0082] As Figure 6As shown, the battery thermal management system 1 comprises a power battery 11, a heating device 12, a heat exchange assembly 13, a temperature detector 15 (not shown in the figure) and a controller 14 (not shown in the figure). The power battery 11 is used to store and supply electric energy required for the operation of the electric vehicle. The heating device 12 is connected to the outer surface of the power battery 11; the heating device 12 can consume the electric quantity of the power battery 11 or sacrifice the charging current to heat itself and transfer heat to the power battery 11, thereby achieving heating of the power battery 11. The heat exchange assembly 13 can heat or cool and dissipate heat for the power battery 11; part of the heat exchange assembly 13 is connected to the outer surface of the power battery 11 to exchange heat with the power battery 11 when the heat exchange assembly 13 works. The temperature detector 15 is arranged on the power battery 11 and is used to detect the temperature of the power battery 11. The controller 14 is electrically connected to the heating device 12, the heat exchange assembly 13 and the temperature detector 15, so as to control the working state of the heating device 12 and the heat exchange assembly 13 according to the temperature information of the power battery 11 detected by the temperature detector 15, so as to heat or cool and dissipate heat for the power battery 11, so that the power battery 11 can be kept at a suitable temperature for operation.

[0083] The heat exchange assembly 13 comprises a heat exchange device 131, a first heat exchange system 132 and a second heat exchange system 133. The heat exchange device 131 is used to exchange heat with the power battery 11; the heat exchange device 131 is connected to the power battery 11 and contacts the outer surface of the power battery 11, and the heat exchange device 131 stores battery cooling liquid which can exchange heat with the power battery 11. The first heat exchange system 132 and the second heat exchange system 133 are both connected to the heat exchange device 131 and are respectively used to heat the power battery 11 and cool and dissipate heat for the power battery 11.

[0084] The first heat exchange system 132 specifically comprises a heat dissipation circulating pipeline 1321, a first heat exchanger 1322, a first electromagnetic valve 1326, a first water pump 1327 and a second water pump 1328. The heat dissipation circulating pipeline 1321 is provided with a radiator 1325 and the second water pump 1328, and the cooling liquid in the heat dissipation circulating pipeline 1321 is driven to circulate by the second water pump 1328. The heat dissipation circulating pipeline 1321 contacts or is close to the drive system of the electric vehicle, so as to absorb the heat transmitted in the working process of the drive system by the cooling liquid, release part of the heat when flowing through the radiator 1325, and achieve heat dissipation for the drive system.

[0085] The first heat exchanger 1322 is provided with a first heat exchange pipeline 1323 and a second heat exchange pipeline 1324. Both ends of the first heat exchange pipeline 1323 are connected to both ends of the heat exchange device 131 through a common pipeline 134, so that the battery cooling liquid in the heat exchange device 131 can flow through the first heat exchanger 1322 through the first heat exchange pipeline 1323. The common pipeline 134 is provided with a first water pump 1327 for driving the battery cooling liquid in the heat exchange device 131 to circulate in the common pipeline 134 and the first heat exchange pipeline 1323. Both ends of the second heat exchange pipeline 1324 are connected to the heat dissipation circulation pipeline 1321, so that the second heat exchange pipeline 1324 and part of the heat dissipation circulation pipeline 1321 are connected in parallel, so that the cooling liquid in the heat dissipation circulation pipeline 1321 can flow through the second heat exchanger 1331 through the second heat exchange pipeline 1324, and exchange heat with the battery cooling liquid in the first heat exchange pipeline 1323 in the second heat exchanger 1331, so that the temperature of the battery cooling liquid is increased, and then when the battery cooling liquid flows back to the heat exchange device 131, heat is released to the power battery 11, realizing heating of the power battery 11. The cooling liquid in the heat dissipation circulation pipeline 1321 is cooled by the radiator 1325, and a part of the heat is released, which can prevent the cooling liquid flowing into the second heat exchange pipeline 1324 from being too high to cause excessive heating of the power battery 11, so as to alleviate the influence of high temperature on the working performance of the power battery 11, and reduce the possibility of high-temperature failure of the power battery 11.

[0086] The first heat exchange pipeline 1323 is provided with a first electromagnetic valve 1326 for opening or closing the first heat exchange pipeline 1323. The connection between the second heat exchange pipeline 1324 and the heat dissipation circulation pipeline 1321 is provided with a first three-way valve 1361, the first valve port and the second valve port of the first three-way valve 1361 are connected to the heat dissipation circulation pipeline 1321 respectively, and the third valve port is connected to the second heat exchange pipeline 1324, so that the second heat exchange pipeline 1324 and the heat dissipation circulation pipeline 1321 are connected or closed. The controller 14 is electrically connected with the first electromagnetic valve 1326 and the first three-way valve 1361 to control the operation of the first electromagnetic valve 1326 and the first three-way valve 1361.

[0087] The second heat exchange system 133 specifically comprises a second heat exchanger 1331, a second electromagnetic valve 1336, a condenser 1334 and an electric compressor 1335. The second heat exchanger 1331 is provided with a third heat exchange pipeline 1332 and a fourth heat exchange pipeline 1333. The third heat exchange pipeline 1332 is connected to both ends of the common pipeline 134 to form a parallel connection with the first heat exchange pipeline 1323; the battery coolant in the heat exchange device 131 can flow through the second heat exchanger 1331 through the third heat exchange pipeline 1332 under the driving of the first water pump 1327, and circulate in the common pipeline 134 and the third heat exchange pipeline 1332. The second electromagnetic valve 1336 electrically connected to the controller 14 is arranged in the third heat exchange pipeline 1332 to be turned on or turned off according to the control instruction of the controller 14. The condenser 1334 and the electric compressor 1335 are arranged in the fourth heat exchange pipeline 1333. The condenser 1334 stores refrigerant and can flow through the second heat exchanger 1331 through the fourth heat exchange pipeline 1333. The refrigerant in the fourth heat exchange pipeline 1333 is pressurized by the electric compressor 1335 to form high-pressure gaseous refrigerant. When the high-pressure gaseous refrigerant flows into the condenser 1334, it is condensed and releases heat, and the low-temperature and low-pressure liquid refrigerant is formed again. The low-temperature and low-pressure liquid refrigerant exchanges heat with the battery coolant in the third heat exchange pipeline 1332 when flowing through the second heat exchanger 1331, absorbs the heat of the battery coolant and returns to the electric compressor 1335. When the cooled battery coolant flows back to the heat exchange device 131, it absorbs the heat of the power battery 11 to cool and dissipate heat for the power battery 11.

[0088] When the temperature detector 15 detects that the temperature of the power battery 11 is too low, the controller 14 controls the heating device 12 or the heat exchange assembly 13 to work according to the motion state of the electric vehicle to heat the power battery 11. Specifically, if the electric vehicle is in a stationary state, the heating device 12 is controlled to heat to heat the power battery 11; if the electric vehicle is in a running state, the first electromagnetic valve 1326 is turned on, the second electromagnetic valve 1336 is turned off, and the first valve port and the third valve port of the first three-way valve 1361 are turned on to make the first heat exchange system 132 work to heat the power battery 11 by using the waste heat of the drive system of the electric vehicle. When the temperature detector 15 detects that the temperature of the power battery 11 is too high, the controller 14 controls the first electromagnetic valve 1326 to be turned off and the second electromagnetic valve 1336 to be turned on to make the second heat exchange system 133 work and absorb the heat of the battery coolant through the fourth heat exchange pipeline 1333, so that the cooled battery coolant cools and dissipates heat for the power battery 11. The motion state of the electric vehicle includes a running state and a stationary state, and the stationary state includes parking and charging.

[0089] It should be noted that the drive system of the electric vehicle in the embodiment includes an electric vehicle drive motor, a motor controller, an integrated auxiliary controller, when the electric vehicle is provided with the loading mechanism, the drive system can further include a loading motor and a loading motor controller.

[0090] In addition, the heating device 12 in the embodiment is specifically a heating film, and the heat exchange device 131 is a liquid cooling plate.

[0091] The battery thermal management system 1 in the embodiment can take corresponding control measures according to the temperature of the power battery 11, so as to heat or cool the power battery 11 according to the working needs, so that the power battery 11 can operate at a suitable temperature, so as to meet the driving needs of the electric vehicle in different environments, and prevent the power battery 11 from affecting the working performance due to too high or too low temperature. In addition, when the power battery 11 is heated, different heating measures can be adopted according to the motion state of the electric vehicle, which is beneficial to the rational use of energy.

[0092] Embodiment Seven

[0093] The embodiment provides an electric vehicle 2, as shown in the figure, the electric vehicle 2 includes a vehicle body 21, a drive system 22 and the battery thermal management system 1 in any of the above embodiments. Figure 8

[0094] The drive system 22 is arranged in the vehicle body 21 and is in transmission connection with the driving mechanism of the vehicle body 21, so as to drive the driving mechanism to operate and realize the driving of the vehicle body 21. The power battery 11 in the battery thermal management system 1 is electrically connected with the drive system 22, so as to supply power to the drive system 22 through the power battery 11. Among them, the battery thermal management system 1 can heat or cool the power battery 11, when the power battery 11 needs to be heated, the controller 14 can control different heating equipment according to the different motion states of the vehicle body 21, and control the heat exchange assembly 13 to heat the power battery 11 when the vehicle body 21 is in the driving state, and control the heating device 12 to heat the power battery 11 by itself when the vehicle body 21 is in the static state.

[0095] Further, as shown in the figure, Figure 9 ​As shown, the electric vehicle 2 is specifically an electric mixer truck, and the driving system 22 includes a driving motor 221, a motor controller 222 and an integrated auxiliary controller 223. The driving motor 221 is drivingly connected with a running mechanism of the vehicle body 21, for driving the vehicle body 21 to run. The motor controller 222 is electrically connected with the driving motor 221, for controlling the driving motor 221 to operate. The integrated auxiliary controller 223 can be a four-in-one controller, for controlling multiple auxiliary systems or devices of the electric vehicle 2 to operate, such as a steering pump, an air compressor, a high-voltage power distribution system and a DC / DC converter. When an upper loading mechanism is arranged on the electric mixer truck, the driving system 22 can further include an upper loading motor and an upper loading motor controller. The heat exchange assembly 13 in the battery thermal management system 1 is assembled with the driving motor 221, the motor controller 222 and the integrated auxiliary controller 223, for absorbing heat generated during operation, so as to dissipate heat from the above components of the driving system 22, and to utilize the heat generated during operation of the above components in the driving system 22 to heat the power battery 11, so as to realize heat recycling and improve energy utilization efficiency.

[0096] In addition, the electric vehicle 2 in the embodiment also has all the technical effects of the battery thermal management system 1 in any of the above embodiments, which will not be described herein again.

[0097] Embodiment Eight

[0098] The embodiment provides a battery heat control method, which is used in the battery thermal management system in any of the above embodiments. As shown in the figure, Figure 10 The battery heat control method includes:

[0099] Step S100: receiving a heat control instruction corresponding to the power battery;

[0100] Step S200: determining whether the heat control instruction is a heating instruction or a heat dissipation instruction; if the heat control instruction is the heating instruction, performing step S300, and if the heat control instruction is the heat dissipation instruction, performing step S400;

[0101] Step S300: controlling the heating device and / or the heat exchange assembly to work according to the motion state of the electric vehicle, for heating the power battery;

[0102] Step S400: controlling the heat exchange assembly to work, for dissipating heat from the power battery.

[0103] In this embodiment, upon receiving the heat control instruction corresponding to the power battery, the heat demand of the power battery at this time is determined through step S200, i.e. whether heating or cooling is needed, and when the heat control instruction is a heating instruction, the heating device and / or the heat exchange assembly are controlled to work according to the motion state of the electric vehicle through step S300, so as to heat the power battery through different heating modes, while when the heat control instruction is a cooling instruction, the heat exchange assembly is controlled to work through step S400, so as to lower the temperature of the power battery and achieve the cooling of the power battery, thereby preventing the power battery from being affected by the excessively high or low temperature to affect the working performance and service life.

[0104] Embodiment Nine

[0105] In this embodiment, a battery heat control method is provided for the battery thermal management system in any of the above embodiments. As shown in Figure 11 The battery heat control method comprises:

[0106] Step S100: receiving a heat control instruction corresponding to the power battery;

[0107] Step S200: determining whether the heat control instruction is a heating instruction or a cooling instruction; if the heat control instruction is a heating instruction, step S310 is executed, and if the heat control instruction is a cooling instruction, step S400 is executed;

[0108] Step S310: determining whether the motion state of the electric vehicle is a static state, and generating a first determination result; if the first determination result is yes, step S320 is executed, and if the first determination result is no, step S330 is executed;

[0109] Step S320: controlling the heating device to work to heat the power battery;

[0110] Step S330: controlling the heat exchange assembly to work or controlling the heat exchange assembly and the heating device to work simultaneously to heat the power battery;

[0111] Step S400: controlling the heat exchange assembly to work to cool the power battery.

[0112] In this embodiment, step S300 in embodiment eight is further improved. The motion state of the electric vehicle is determined to be a static state, i.e. whether the electric vehicle is currently in a static state or a running state, and a first determination result is generated. If the first determination result is yes, i.e. the electric vehicle is in a static state at this time, including a parking state and a charging state, the heating device is controlled to work through step S320 to heat the power battery by the heat generated by the heating device itself to warm up the power battery. If the first determination result is no, the heat exchange assembly is controlled to work or the heat exchange assembly and the heating device are controlled to work at the same time through step S330 to heat the power battery by the heat generated by the driving system during the running of the electric vehicle to warm up the power battery. Of course, the heating device and the heat exchange assembly can also heat the power battery at the same time at this time.

[0113] The technical scheme of the application is described in detail above in combination with the drawings. The power battery can be heated or cooled according to the working requirements, the control accuracy of the temperature of the power battery is higher, the power battery can be prevented from malfunctioning due to too high or too low temperature, the power battery can be heated by different heating methods, which is beneficial to improve the energy utilization efficiency, and the power battery is not directly connected with the heat dissipation pipeline of the driving system of the electric vehicle, which is beneficial to reduce the loop resistance.

[0114] In the present application, it can be understood that any process or method described in the flowchart or otherwise described herein can be understood as representing a module, segment or portion of code that includes executable instructions to implement a specific logical function or process, and the scope of the preferred embodiments of the present application includes additional implementations in which the functions are performed in an order different from that shown or discussed, including functions performed in a substantially simultaneous manner or in reverse order, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0115] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of instructions to implement logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- based system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a computer- readable storage medium or a computer-readable signal medium. The computer- readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires (electronic), a portable computer diskette (magnetic), a RAM (random access memory), a ROM (read-only memory), an EPROM (erasable programmable ROM), an EEPROM (electrically erasable programmable ROM), and a portable compact disc read-only memory (CD-ROM) (optical). In addition, the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via the optical scanner of a device or device or via the acoustical scanning of the paper or other medium, then electronically captured, interpreted, or processed in a suitable manner if necessary, and then stored in a computer memory.

[0116] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and so on.

[0117] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by programs instructing related hardware, and the programs can be stored in a computer-readable storage medium. When the programs are executed, they include one or a combination of the steps of the method embodiments.

[0118] In addition, each function unit in each embodiment of the present application can be integrated in one processing module, or each unit can exist physically independently, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware, or in the form of software function module. When the integrated module is realized in the form of software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0119] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0120] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery thermal management system (1) for an electric vehicle, characterized in that, The application relates to an electric vehicle battery heating and cooling device. The device comprises: a power battery (11) for storing electric energy; a heating device (12) connected to the outer surface of the power battery (11), wherein the heating device (12) can generate heat to heat the power battery (11); a heat exchange assembly (13) partially connected to the outer surface of the power battery (11), wherein the heat exchange assembly (13) can exchange heat with the power battery (11) to heat or cool the power battery (11); a controller (14) electrically connected to the heating device (12) and the heat exchange assembly (13) to control the working state of the heating device (12) and the heat exchange assembly (13), wherein the controller (14) can control the heating device (12) and / or the heat exchange assembly (13) to heat the power battery (11) according to the motion state of the electric vehicle, and the controller (14) can also control the heat exchange assembly (13) to cool the power battery (11); the motion state comprises a driving state and a static state, wherein the static state comprises parking and charging; a temperature detector (15) arranged on the power battery (11) to detect the temperature of the power battery (11), wherein the temperature detector (15) is electrically connected to the controller (14) to send a temperature signal of the power battery (11) to the controller (14); the heat exchange assembly (13) comprises: a heat exchange device (131) connected to the outer surface of the power battery (11), wherein the heat exchange device (131) contains battery cooling liquid for heat exchange of the power battery (11); a first heat exchange system (132) in communication with the heat exchange device (131), wherein the first heat exchange system (132) can obtain heat of a driving system of the electric vehicle, release heat of the battery cooling liquid to heat the battery cooling liquid, and release heat of the battery cooling liquid to the power battery (11) when the battery cooling liquid flows through the power battery (11) to heat the power battery (11); a second heat exchange system (133) in communication with the heat exchange device (131), wherein the second heat exchange system (133) can absorb heat of the battery cooling liquid to cool the power battery (11) when the battery cooling liquid flows through the power battery (11); wherein the first heat exchange system (132) comprises a heat dissipation circulating pipeline (1321); a first heat exchanger (1322) provided with a first heat exchange pipeline (1323) and a second heat exchange pipeline (1324), wherein the first heat exchange pipeline (1323) is in communication with both ends of the heat exchange device (131) through a common pipeline (134), and the second heat exchange pipeline (1324) is connected to the heat dissipation circulating pipeline (1321); a first electromagnetic valve (1326) arranged in the first heat exchange pipeline (1323); the second heat exchange system (133) comprises: A second heat exchanger (1331) is provided with a third heat exchange pipeline (1332) and a fourth heat exchange pipeline (1333), two ends of the third heat exchange pipeline (1332) are connected with two ends of the common pipeline (134) respectively; A second electromagnetic valve (1336) is arranged in the third heat exchange pipeline (1332); A first three-way valve (1361) is arranged at the connection between the second heat exchange pipeline (1324) and the heat dissipation circulation pipeline (1321); When the temperature detector (15) detects that the temperature of the power battery (11) is too low, if the electric vehicle is in a stationary state, the heating device (12) is controlled to heat, so as to heat the power battery (11); if the electric vehicle is in a driving state, the first electromagnetic valve (1326) is controlled to be turned on, the second electromagnetic valve (1336) is controlled to be turned off, and the first valve port and the third valve port of the first three-way valve (1361) are controlled to be turned on, so that the first heat exchange system (132) works, so as to heat the power battery (11) by using the waste heat of the driving system of the electric vehicle; When the temperature detector (15) detects that the temperature of the power battery (11) is too high, the controller (14) controls the first electromagnetic valve (1326) to be turned off and the second electromagnetic valve (1336) to be turned on, so that the second heat exchange system (133) works, and the heat of the battery cooling liquid is absorbed through the fourth heat exchange pipeline (1333), so that the cooled battery cooling liquid cools and dissipates heat for the power battery (11).

2. The battery thermal management system (1) according to claim 1, characterized in that The controller (14) is electrically connected with the first heat exchange system (132) and the second heat exchange system (133) to control the operation of the first heat exchange system (132) and the second heat exchange system (133).

3. The battery thermal management system (1) according to claim 2, characterized in that The first heat exchange system (132) further comprises: A radiator (1325) is arranged in the heat dissipation circulation pipeline (1321), and the cooling liquid in the heat dissipation circulation pipeline (1321) flows through the driving system of the electric vehicle and the radiator (1325) to dissipate heat for the driving system; The first electromagnetic valve (1326) is electrically connected with the controller (14) to be turned on or turned off according to the control instruction of the controller (14); A first water pump (1327) is arranged in the common pipeline (134) of the first heat exchange pipeline (1323) and the heat exchange device (131) of the second heat exchange system (133) to drive the flow of the battery cooling liquid; A second water pump (1328) is arranged in the heat dissipation circulation pipeline (1321) to drive the flow of the cooling liquid in the heat dissipation circulation pipeline (1321), Wherein, the cooling liquid in the heat dissipation circulation pipeline (1321) can flow into the second heat exchange pipeline (1324), and the battery cooling liquid in the first heat exchange pipeline (1323) is heat exchanged with the battery cooling liquid in the first heat exchange pipeline (1323) through the first heat exchanger (1322), so that the battery cooling liquid is heated.

4. The battery thermal management system (1) according to claim 3, characterized in that The second heat exchange system (133) further comprises: The second solenoid valve (1336) is electrically connected to the controller (14) to open or close the third heat exchange pipeline (1332) according to the control command of the controller (14). A condenser (1334) is provided in the fourth heat exchange pipeline (1333) for condensing the refrigerant in the fourth heat exchange pipeline (1333); An electric compressor (1335), located in the fourth heat exchange pipeline (1333), is used to pressurize the refrigerant to form a high-pressure gaseous coolant. The refrigerant can circulate in the fourth heat exchange pipeline (1333) and exchange heat with the battery coolant in the third heat exchange pipeline (1332) through the second heat exchanger (1331) to cool the battery coolant.

5. The battery thermal management system (1) according to claim 3, characterized in that, The heat dissipation circulation pipe (1321) also includes: A three-way valve is located at the connection between the second heat exchange pipeline (1324) and the heat dissipation circulation pipeline (1321). The first and second valve ports of the three-way valve are connected to the heat dissipation circulation pipeline (1321), and the third valve port of the three-way valve is connected to the second heat exchange pipeline (1324). The controller (14) is electrically connected to the three-way valve and controls the operation of the three-way valve to control the connection status between the second heat exchange pipeline (1324) and the heat dissipation circulation pipeline (1321).

6. The battery thermal management system (1) according to claim 3, characterized in that The first heat exchange system (132) further includes: The third solenoid valve (1363) is located in the second heat exchange pipeline (1324); The fourth solenoid valve (1364) is located in the heat dissipation circulation pipe (1321) between the two connection points of the second heat exchange pipe (1324). The controller (14) is electrically connected to the third solenoid valve (1363) and the fourth solenoid valve (1364) to control the operation of the third solenoid valve (1363) and the fourth solenoid valve (1364).

7. The battery thermal management system (1) according to claim 2, characterized in that, The heating device (12) is a heating film; and / or The heat exchange device (131) is a liquid cooling plate.

8. An electric vehicle (2) characterized by include: Vehicle body (21); A drive system (22) is provided inside the vehicle body (21) and is used to drive the vehicle body (21) to travel; The battery thermal management system (1) as described in any one of claims 1 to 7 is disposed in the vehicle body (21), and the power battery in the battery thermal management system (1) is electrically connected to the drive system (22) to supply power to the drive system (22).

9. A battery heat control method for the battery thermal management system of any one of claims 1 to 7, characterized by, include: Step S100: Receive the thermal control command corresponding to the power battery; Step S200: Determine whether the heat control command is a heating command or a heat dissipation command; If the heat control command is a heating command, execute step S300: control the heating device and / or heat exchange components to work according to the motion state of the electric vehicle to heat the power battery; If the heat control command is a heat dissipation command, execute step S400: control the heat exchange component to work and dissipate heat from the power battery.

10. The battery heat control method of claim 9, wherein, The step S300: controlling the heating device and / or the heat exchange assembly to work according to the motion state of the electric vehicle, and heating the power battery, specifically comprising: Step S310: judging whether the motion state of the electric vehicle is a static state, and generating a first judgment result; If the first judgment result is yes, step S320 is executed: controlling the heating device to work and heating the power battery; If the first judgment result is no, step S330 is executed: controlling the heat exchange assembly to work or controlling the heat exchange assembly and the heating device to work at the same time, and heating the power battery.

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