WO2022142996A1 - Method and apparatus for controlling temperature of power battery - Google Patents

Abstract

A method and apparatus for controlling the temperature of a power battery, which relate to the technical field of vehicles. The method comprises: acquiring a first cell temperature and a target cell temperature of a power battery; according to the first cell temperature and the target cell temperature, determining the heat exchange demand and the heat exchange type; controlling a temperature control system to execute a temperature control operation corresponding to the heat exchange type; controlling a heat exchange apparatus to perform heat exchange with the temperature control system, and, during heat exchange, acquiring the actual amount of heat exchange of the heat exchange apparatus as well as the amount of heat produced by the battery; determining the remaining amount of heat exchange according to the heat exchange demand, the actual amount of heat exchange, and the amount of heat produced by the battery; when the remaining amount of heat exchange is greater than a preset threshold, executing the described process of acquiring the actual amount of heat exchange of the heat exchange apparatus as well as the amount of heat produced by the battery; and stopping the heat exchange when the remaining amount of heat exchange is less than or equal to the preset threshold. The actual heat exchange demand required by the power battery at the current moment is used as a servo request condition, thus avoiding excessive servo energy consumption waste by a thermal servo management system due to the influence of the precision of temperature.

Description

A kind of temperature control method and device of power battery

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent publication with the application number of 202011589639.X and the title of "a temperature control method and device for a power battery" filed with the China Patent Office on December 28, 2020, the entire contents of which are incorporated by reference in this application.

technical field

The present disclosure relates to the technical field of vehicles, and in particular, to a temperature control method and device for a power battery.

Background technique

At present, the power battery is the main energy storage source for the operation of pure electric vehicles and hybrid vehicles. It is usually necessary to ensure that the temperature of the cells of the power battery is within a certain range to work in the best state.

In the prior art, after the temperature sensor of the power battery monitors the cell temperature of the power battery, it is determined whether the heat exchange is to be performed by judging whether the cell temperature satisfies the heat exchange condition. When the heat exchange conditions are satisfied, the heat exchange device of the power battery is controlled by the thermal management servo system of the power battery to exchange heat with the air conditioning system or the cooling system of the vehicle. Due to the influence of the accuracy of the temperature sensor of the power battery, the temperature of the battery cell fed back by the temperature sensor will often jump. For example, when the accuracy of the temperature sensor is 1°C, the heat exchange condition is set to be heat exchange when the cell temperature is greater than or equal to 26°C. At this time, when the actual temperature of the cell is 26.6°C, the temperature of the cell fed back by the temperature sensor will jump back and forth between 26°C and 27°C, and the thermal management servo control system will also receive the enable signal frequently. heat exchange. In order to avoid the above problems, those skilled in the art usually set the stop heat exchange condition to 23°C. When the cell temperature fed back by the temperature sensor is 27°C, the thermal management servo system receives the enable signal for heat exchange, and then no matter the temperature Whether the temperature fed back by the sensor is 26°C or 27°C, the temperature continues to drop until the cell temperature is less than or equal to 23°C.

However, in the process of realizing the present disclosure, the inventor found that at least the following problems exist in the prior art:

As for the cell temperature, it is not necessary to continue cooling when the cell temperature is reduced to below 26°C, and the above method has a heat exchange temperature of 2 to 3°C, which is an unnecessary change due to the control accuracy. heat demand. That is, the above processing method will cause the thermal management servo system to generate excessive and unnecessary heat exchange, resulting in excessive consumption of energy consumption of the thermal management servo system.

Overview

In view of this, the present disclosure aims to provide a temperature control method and device for a power battery to solve the problem of excessive consumption of energy consumption of a thermal management servo system due to the influence of the accuracy of the temperature sensor of the power battery in the prior art.

In order to achieve the above-mentioned purpose, the technical scheme of the present disclosure is realized as follows:

In a first aspect, an embodiment of the present disclosure provides a temperature control method for a power battery, which is applied to a vehicle. The vehicle includes: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange device coupled with the temperature control system, the method includes:

acquiring the first cell temperature of the power battery, and acquiring the target cell temperature of the power battery;

According to the temperature of the first cell and the temperature of the target cell, determine the heat exchange demand of the power battery, and determine the heat exchange type corresponding to the power battery;

controlling the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

Controlling the heat exchange device to exchange heat with the temperature control system, and acquiring the actual heat exchange amount of the heat exchange device and the heat generated by the battery during the heat exchange process;

Determine the remaining heat exchange amount according to the heat exchange demand, the actual heat exchange amount, and the battery heat production;

When the remaining heat exchange amount is greater than a preset threshold value, continue to control the heat exchange device to perform heat exchange with the temperature control system, and acquire the actual value of the heat exchange device during the heat exchange process. The steps of exchanging heat and generating heat from the battery; when the remaining heat exchange is less than or equal to a preset threshold, the process of heat exchange is stopped.

Preferably, before the controlling the heat exchange device to perform heat exchange with the temperature control system, the method further comprises:

obtaining the vehicle running state of the vehicle;

The controlling the heat exchange device to exchange heat with the temperature control system includes:

According to the vehicle operation state, the heat exchange device is controlled to exchange heat with the temperature control system in a heat exchange manner corresponding to the vehicle operation state; wherein, the heat exchange efficiencies corresponding to different vehicle operation states are different.

Preferably, the acquiring the vehicle running state of the vehicle includes:

If the heat exchange type is a cooling type, obtain the cooling demand level of the vehicle passenger compartment, the vehicle speed, the ambient temperature of the surrounding environment of the vehicle, and the current cell temperature of the power battery. at least one of the differences;

The controlling the heat exchange device to perform heat exchange with the temperature control system in a heat exchange manner corresponding to the vehicle operating state according to the vehicle operating state includes:

According to at least one of the cooling demand level, the speed of the vehicle, the difference between the ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery, query the preset vehicle operating state and heat exchange The corresponding relationship between the modes is determined, the heat exchange mode corresponding to the running state of the vehicle is determined, and the heat exchange device is controlled to exchange heat with the temperature control system in the heat exchange mode.

Preferably, the heat exchange device includes a heat exchange liquid circulation system, and the heat exchange liquid circulation system includes a liquid inlet, a liquid outlet, and a liquid pump; the obtaining the actual heat exchange of the heat exchange device includes: :

acquiring the first liquid temperature of the liquid inlet, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump within a first preset time period;

According to the first liquid temperature, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump, the actual heat exchange amount is obtained by integrating over the first preset time period.

Preferably, the acquiring the target cell temperature of the power battery includes:

Obtain the target temperature range of the power battery; the target temperature range includes: a maximum temperature value and a minimum temperature value;

When the temperature of the first cell is greater than the maximum temperature value, the maximum temperature value is used as the target cell temperature;

When the temperature of the first cell is less than the minimum temperature value, the minimum temperature value is used as the target cell temperature;

When the first cell temperature is greater than or equal to the minimum temperature value and less than or equal to the maximum temperature value, the first cell temperature is used as the target cell temperature.

Preferably, the heat exchange types include: cooling type, heating type, and no heat exchange type;

The determining of the heat exchange type corresponding to the power battery includes:

When the temperature of the first cell is greater than the temperature of the target cell, determining that the heat exchange type is a cooling type;

When the temperature of the first cell is lower than the temperature of the target cell, determining that the heat exchange type is a heating type;

When the first cell temperature is equal to the target cell temperature, it is determined that the heat exchange type is a non-heat exchange type.

In a second aspect, embodiments of the present disclosure further provide a temperature control device for a power battery, which is applied to a vehicle, where the vehicle includes: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange A device is coupled and connected to the temperature control system, and the device includes:

a first obtaining module, configured to obtain the temperature of the first cell of the power battery and obtain the temperature of the target cell of the power battery;

a first determination module, configured to determine the heat exchange demand of the power battery according to the first cell temperature and the target cell temperature, and determine the heat exchange type corresponding to the power battery;

a control module, configured to control the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

a second acquisition module, configured to control the heat exchange device to exchange heat with the temperature control system, and acquire the actual heat exchange amount of the heat exchange device and the heat generated by the battery during the heat exchange process;

a second determining module, configured to determine the remaining heat exchange amount according to the heat exchange demand, the heat exchange amount, and the heat generated by the battery;

The judgment module is configured to enter the second acquisition module when the remaining heat exchange amount is greater than a preset threshold; and stop the heat exchange process when the remaining heat exchange amount is less than or equal to the preset threshold.

Preferably, the device further comprises:

a third acquiring module, configured to acquire the vehicle running state of the vehicle before the control of the heat exchange device to perform heat exchange with the temperature control system;

The control module is further configured to: control the heat exchange device to exchange heat with the temperature control system in a heat exchange manner corresponding to the vehicle operation state according to the vehicle operation state; wherein different vehicles operate The heat transfer efficiency corresponding to the state is different.

In a third aspect, an embodiment of the present disclosure further provides an electronic device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor, the program or instruction being When executed by the processor, the steps of the foregoing method for controlling the temperature of the power battery are realized.

In a fourth aspect, an embodiment of the present disclosure further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the foregoing temperature control method for a power battery is implemented. step.

To sum up, the temperature control method of the power battery provided by the embodiment of the present disclosure is to obtain the temperature of the first cell and the temperature of the target cell of the power battery; according to the temperature of the first cell and the temperature of the target cell, determine The heat exchange demand of the power battery and the corresponding heat exchange type; control the temperature control system to perform a temperature control operation corresponding to the heat exchange type; control the heat exchange device to perform heat exchange with the temperature control system , and in the process of performing the heat exchange, obtain the actual heat exchange of the heat exchange device and the heat output of the battery; according to the demand for heat exchange, the actual heat exchange, and the heat output of the battery, determine Remaining heat exchange; when the remaining heat exchange is greater than a preset threshold, continue to control the heat exchange device to exchange heat with the temperature control system, and obtain the heat exchange during the heat exchange process. The steps of the actual heat exchange of the heat exchange device and the heat generation of the battery; when the remaining heat exchange is less than or equal to a preset threshold, the process of heat exchange is stopped. In the embodiment of the present disclosure, the current heat exchange demand of the battery is pre-determined before the heat exchange process is performed, and during the heat exchange process, the current cell temperature of the battery can reach the target cell temperature. The remaining heat exchange is determined. Therefore, during the heat exchange process, the actual heat exchange demand required by the power battery at the moment is used as the servo request condition, so as to avoid the transition servo of the thermal management servo system caused by the accuracy of the temperature sensor, and save the servo energy consumption.

Brief Description of Drawings

The accompanying drawings constituting a part of the present disclosure are used to provide further understanding of the present disclosure, and the exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached image:

1 is a flowchart of a temperature control method for a power battery provided by an embodiment of the present disclosure;

FIG. 2 is a flowchart of another temperature control method for a power battery provided by an embodiment of the present disclosure;

3 is a structural block diagram of a temperature control device for a power battery according to an embodiment of the present disclosure;

4 is a structural block diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present disclosure;

FIG. 6 shows a block diagram of a computing processing device for performing a method according to an embodiment of the present disclosure; and

Figure 7 shows a storage unit for holding or carrying program code implementing a method according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

Referring to Fig. 1, a flowchart of a temperature control method for a power battery provided by an embodiment of the present disclosure is shown.

The embodiments of the present disclosure are applied to vehicles. Before introducing the temperature control method for the power battery, various components involved are described.

In an embodiment of the present disclosure, a vehicle includes: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange device is coupled and connected to the temperature control system. Wherein, the heat exchange device includes a heat exchange liquid circulation system, and the heat exchange liquid circulation system includes a liquid inlet, a liquid outlet, and a liquid pump.

Specifically, the temperature control system may be an air conditioning system or a cooling system of the vehicle. The heat exchange device is a heat exchange liquid circulation system wrapped around the power battery, and the heat exchange medium used in the heat exchange liquid circulation system can be water vapor, water, refrigerant and other media that can realize heat exchange function. When the heat exchange working medium is water, the liquid pump is a water pump. The heat exchange liquid circulation system has a liquid inlet, a liquid outlet and a liquid pump, and the working fluid of the heat exchange liquid circulation system can be continuously circulated between the liquid inlet and the liquid outlet. The coupling connection between the heat exchange device and the temperature control system is as follows: the heat exchange device of the power battery is controlled by the thermal management servo system of the power battery to exchange heat with the temperature control system of the vehicle. In the embodiment of the present disclosure, the rotational speed of the liquid pump can be adjusted according to the heat exchange efficiency.

Step S101: obtaining the first cell temperature of the power battery, and obtaining the target cell temperature of the power battery;

In the embodiment of the present disclosure, the first cell temperature is the actual temperature of the cells of the power battery measured by the power battery temperature sensor. After the vehicle is powered on, the vehicle's VCU (VCU is the core electronic control unit that implements vehicle control decisions) can obtain the current actual temperature of the power battery cells through the battery's temperature sensor, that is, the first cell temperature. . The target cell temperature is the target temperature to be reached by the cells of the power battery. The target cell temperature is determined by the temperature range in which the power battery can work in the best state and the current actual temperature of the cells.

Step S102: According to the first cell temperature and the target cell temperature, determine the heat exchange demand of the power battery, and determine the heat exchange type corresponding to the power battery;

In the embodiment of the present disclosure, the heat exchange demand is the heat required to adjust the cell temperature of the battery from the first cell temperature to the target cell temperature. Heat exchange types include: cooling type, heating type, and no heat exchange type. The heat exchange type can be determined according to the magnitude relationship between the temperature of the first cell and the temperature of the target cell.

Step S103: controlling the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

In the embodiment of the present disclosure, after the heat exchange type corresponding to the power battery is determined, the vehicle VCU can control the air conditioning system or cooling system of the vehicle correspondingly according to the heat exchange type, so as to adjust the temperature of the battery cells.

Step S104: control the heat exchange device to exchange heat with the temperature control system, and in the process of performing the heat exchange, obtain the actual heat exchange amount of the heat exchange device and the heat generated by the battery;

In the embodiment of the present disclosure, after the vehicle VCU controls the temperature control system to perform the heat exchange operation corresponding to the heat exchange type, the vehicle VCU sends an enable signal to the thermal servo management system of the power battery, so that the thermal servo management system of the battery controls the heat exchange Heat exchange is performed between the device and the air conditioning system or the refrigeration system, so as to achieve cooling or heating of the cell temperature.

During the process that the thermal management servo system of the battery controls the heat exchange between the heat exchange device and the temperature control system, the actual heat exchange amount of the heat exchange device and the heat generated by the battery are obtained in a preset cycle. Wherein, the actual heat exchange is: the heat exchanged between the heat exchange device and the temperature control system within the first preset time period. The heat generated by the battery is: the heat generated by the battery itself within the first preset time period. In the embodiment of the present disclosure, the first preset time period may be set to 30S.

Step S105: Determine the remaining heat exchange amount according to the heat exchange demand, the actual heat exchange amount, and the battery heat production;

In the embodiment of the present disclosure, the remaining heat exchange amount is the amount of heat required by the battery cells to reach the target cell temperature after each heat exchange process between the heat exchange device and the temperature control system for a first preset time period. Exchange heat.

In order to avoid excessive energy consumption of the thermal management servo system, in the process of exchanging heat between the heat exchange device and the temperature control system, the remaining heat exchange heat is calculated once every first preset time period. By continuously determining the remaining heat exchange, it is possible to determine whether it is necessary to continue heat exchange, so as to achieve accurate heat exchange.

Step S106: when the remaining heat exchange amount is greater than a preset threshold, continue to control the heat exchange device to exchange heat with the temperature control system, and obtain the heat exchange during the heat exchange process. The actual heat exchange of the device and the steps of the battery to generate heat;

In the embodiment of the present disclosure, the preset threshold is a preset critical heat threshold that can stop heat exchange. For example, the preset threshold can be set to 100J. The preset threshold value can be calculated from the product of the enthalpy value of the heat exchange working medium and the mass of the heat exchange working medium in the heat exchange liquid circulation system. Those skilled in the art can also set other preset thresholds according to actual requirements, which are not specifically limited in the present disclosure.

Specifically, after the remaining heat exchange amount is determined after each first preset time period, the remaining heat exchange amount is compared with a preset threshold value, and when the remaining heat exchange amount is still greater than the preset threshold value, the current electric If the core temperature has not yet reached the target cell temperature, the heat exchange process between the heat exchange device and the temperature control system is continued, and the remaining heat exchange amount is continuously determined during the heat exchange process. That is, every time the first preset time period elapses, it is necessary to judge whether the temperature of the cell reaches the target cell temperature, so as to prevent the thermal management servo system from over-serving and causing waste of energy consumption.

Step S107: when the remaining heat exchange amount is less than or equal to a preset threshold, stop the process of heat exchange.

Specifically, when the remaining heat exchange amount is less than or equal to the preset threshold, it means that the cell temperature basically reaches the target cell temperature. At this time, the heat exchange process is stopped, but the heat exchange working fluid in the cooling cycle system is maintained. Cycle, use the heat carried by the heat-exchanged heat-exchange working medium to balance the heat of the cell, and then achieve accurate heat exchange. For example, when the heat exchange working medium is water, after the heat exchange is stopped, the residual temperature of the water is used to balance the heat of the cell. In addition, after the heat exchange is stopped so that the heat carried by the heat exchange working medium is balanced with the heat of the cell, so that the temperature of the cell accurately reaches the target cell temperature, the process returns to step S101 to continue a new round of the second preset time period. Obtain the temperature of the first cell of the power battery. In the embodiment of the present disclosure, the set length of the second preset time period is greater than the set length of the first preset time period. For example, when the first preset time period is 30s, the second preset time period is set to 3min.

It should be noted that, in the embodiment of the present disclosure, the value of the set preset threshold is greater than 0J. If the preset threshold is set to 0J, the process of heat exchange will only be stopped when the remaining heat exchange amount is 0J. However, after the heat exchange is stopped at this time, the heat carried by the heat exchange working fluid in the cooling cycle system will continue to affect the temperature of the cell, which may cause the cell temperature to fail to accurately reach the target cell temperature. . Moreover, compared with the process of stopping heat exchange at 100J, the heat exchange is stopped when the remaining heat exchange amount is 0J. For the thermal management servo system, there is also a small amount of transient servo, resulting in unnecessary waste of energy consumption.

To sum up, the temperature control method of the power battery provided by the embodiment of the present disclosure is to obtain the temperature of the first cell and the temperature of the target cell of the power battery; according to the temperature of the first cell and the temperature of the target cell, determine The heat exchange demand of the power battery and the corresponding heat exchange type; control the temperature control system to perform a temperature control operation corresponding to the heat exchange type; control the heat exchange device to perform heat exchange with the temperature control system , and in the process of performing the heat exchange, obtain the actual heat exchange of the heat exchange device and the heat output of the battery; according to the demand for heat exchange, the actual heat exchange, and the heat output of the battery, determine Remaining heat exchange; when the remaining heat exchange is greater than a preset threshold, continue to control the heat exchange device to exchange heat with the temperature control system, and obtain the heat exchange during the heat exchange process. The steps of the actual heat exchange of the heat exchange device and the heat generation of the battery; when the remaining heat exchange is less than or equal to a preset threshold, the process of heat exchange is stopped. In the embodiment of the present disclosure, the current heat exchange demand of the battery is pre-determined before the heat exchange process is performed, and during the heat exchange process, the current cell temperature of the battery can reach the target cell temperature. Heat exchange is determined. Therefore, during the heat exchange process, the actual heat exchange demand required by the power battery at the moment is used as the servo request condition, so as to avoid the transition servo of the thermal management servo system caused by the accuracy of the temperature sensor, and save the servo energy consumption.

Referring to FIG. 2 , a flowchart of another temperature control method for a power battery provided by an embodiment of the present disclosure is shown.

Step S201: acquiring the first cell temperature of the power battery, and acquiring the target cell temperature of the power battery;

In the embodiment of the present disclosure, the power battery has a temperature range that can work in an optimal state, that is, a safe and efficient temperature range, as well as the actual temperature generated by the battery cell. The temperature of the first battery cell is the actual temperature of the battery cell obtained by monitoring the temperature sensor of the power battery. The target cell temperature is the temperature reached after heat exchange between the cells of the power battery and the air conditioning system or cooling system of the vehicle. The target cell temperature is determined by the temperature range in which the power battery can work in the best state and the actual temperature of the cells decided together.

After the vehicle is powered on, the VCU of the vehicle obtains the current actual temperature of the battery cells of the power battery through the battery temperature sensor, and obtains the information that the power battery can work in the best state according to the specific type of the power battery used. Temperature range, and then determine the target cell temperature by judging the relationship between the actual temperature of the cell and the maximum temperature value and the minimum temperature value in the temperature range where the power battery can work in the best state.

Optionally, obtaining the target cell temperature of the power battery can be achieved in the following manner:

Obtain the target temperature range of the power battery; the target temperature range includes: a maximum temperature value and a minimum temperature value;

When the temperature of the first cell is greater than the maximum temperature value, it means that the cell needs to be cooled down, and the target cell temperature = the maximum temperature value;

When the temperature of the first cell < the minimum temperature value, it means that the cell needs to be heated up, and the target cell temperature = the minimum temperature value;

When the minimum temperature value≤first cell temperature≤maximum temperature value, it means that the cell is working in an optimal state and there is no heat exchange requirement, then the target cell temperature=first cell temperature.

For example, the temperature range in which the battery can work in an optimal state is 20-40°C. When the temperature of the first cell is 50°C, it is determined that 50°C>40°C, indicating that the battery needs to be cooled, and the target cell temperature is 40°C. When the temperature of the first cell is 10°C, it is determined that 10°C<20°C, indicating that the battery needs to be heated up, and the target cell temperature is 20°C.

It should be noted that the performance of the vehicle is different, and the temperature range in which the power battery can work in the best state is different. For example, when a vehicle uses a lithium iron phosphate battery, the temperature range in which the battery can work in an optimal state is 10 to 50 °C. When the vehicle uses the ternary 622 battery, the temperature range in which the battery can work in the best state is 20-45°C. When the vehicle uses the ternary 811 battery, the temperature range in which the battery can work in the best state is: 20 ~ 40 ℃.

Step S202: According to the first cell temperature and the target cell temperature, determine the heat exchange demand of the power battery, and determine the heat exchange type corresponding to the power battery;

In the embodiment of the present disclosure, the heat exchange demand is the heat required to adjust the cell temperature of the battery from the first cell temperature to the target cell temperature. Among them, the heat exchange demand is calculated by the following formula:

Heat exchange demand = (first cell temperature - target cell temperature) × average specific heat capacity of the battery system × battery system quality + heat balance heat exchange;

Among them, heat balance heat exchange = (target cell temperature - ambient temperature)/thermal resistance of the battery system to the environment;

Among them, the heat required for a cell with a specific heat capacity of 1kg to increase its temperature by 1K. Mass is a physical property of a cell, and it is a measure of the quantity of the cell. Thermal resistance is the ratio between the temperature difference between the two ends of the cell and the power of the heat source when heat is transmitted on the cell. The heat balance heat transfer is the heat required to maintain the cell temperature of the battery at the target cell temperature under the ambient temperature of the battery. For example, when the target cell temperature is 40°C and the environment where the battery is located is 25°C, after reducing the first cell temperature of the battery from 50°C to the target cell temperature of 40°C, keep the battery at 25°C. The heat required is always 40°C.

In the embodiment of the present disclosure, the heat exchange types include: cooling type, heating type, and no heat exchange type.

Optionally, determining the heat exchange type corresponding to the power battery can be achieved in the following ways:

When the temperature of the first cell > the temperature of the target cell, determine that the heat exchange type is the cooling type;

When the temperature of the first cell is less than the temperature of the target cell, the heat exchange type is determined to be the heating type;

When the first cell temperature=target cell temperature, it is determined that the heat exchange type is the non-heat exchange type.

It should be noted that if the temperature of the first cell of the power battery is obtained and the heat exchange type is determined, the heat exchange is performed based on the temperature, and the monitored temperature will be affected by the accuracy of the temperature sensor, which is easy to cause. over the servo. However, in the embodiment of the present disclosure, after the first cell temperature of the power battery is obtained and the heat exchange type is determined, the heat exchange is not directly performed, but the heat exchange requirement for the cell temperature to reach the target cell temperature is calculated. The heat exchange process is carried out after the amount of heat exchange, and the heat exchange demand is used as the benchmark, which provides a prerequisite for avoiding the waste of energy consumption of the thermal management servo system.

Step S203: controlling the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

Specifically, when the heat exchange type is the cooling type, the vehicle VCU can control the cooling of the air conditioning system, or control the cooling of the cooling system. When the heat exchange type is the heating type, the vehicle VCU can control the heating of the air conditioning system. Moreover, the vehicle VCU can adjust the control temperature of the air conditioning system or the refrigeration system according to the target cell temperature. When the heat exchange type is the non-heat exchange type, the vehicle VCU maintains the existing operation mode of the air conditioning system or the refrigeration system.

Step 204: obtaining the vehicle running state of the vehicle;

In the embodiment of the present disclosure, in order to further reduce the energy consumption of the thermal management servo system, the vehicle VCU also acquires the vehicle running state of the vehicle. Optionally, in the case where the heat exchange type is the refrigeration type, at least one of the differences between the cooling demand level of the vehicle occupant compartment, the vehicle speed, the ambient temperature of the surrounding environment of the vehicle, and the current cell temperature of the power battery is obtained. One item; when the heat exchange type is the heating type, obtain the difference between the heating demand level of the passenger compartment of the vehicle, the speed of the vehicle, the ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery. At least one item; when the heat exchange type is no heat exchange type, the running state of the vehicle is not obtained. Wherein, the cooling demand level or heating demand level of the passenger compartment is the urgency of the cooling or heating demand of the user in the passenger compartment.

Step S205: Control the heat exchange device to exchange heat with the temperature control system in a heat exchange manner corresponding to the vehicle operation state according to the vehicle operating state, and in the process of performing the heat exchange, Obtain the actual heat exchange of the heat exchange device and the heat produced by the battery; wherein, the heat exchange efficiencies corresponding to different vehicle operating states are different;

In the embodiment of the present disclosure, after obtaining the vehicle running state, the vehicle VCU will determine the difference between the cooling demand level or heating demand level of the passenger compartment, the vehicle speed, the ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery. At least one of the differences between the two, query the correspondence between the preset vehicle operating state and the heat exchange mode, determine the heat exchange mode corresponding to the vehicle operating state, and then control the heat exchange device to determine the heat exchange mode and the determined heat exchange mode. The temperature control system conducts heat exchange. Among them, the heat exchange efficiencies corresponding to different vehicle operating states are different.

For example, if the speed of the vehicle is obtained, the heat exchange efficiency will be higher. At this time, after querying the corresponding relationship between the preset vehicle operating state and the heat exchange mode, it can be obtained that the corresponding heat exchange mode under the faster vehicle speed operation mode is: the liquid pump speed, fan speed, expansion The valve opening is increased. That is, the heat exchange regulation of the power battery is accelerated, and the servo time of the thermal management servo system is reduced.

If the obtained vehicle speed is slower, the heat exchange efficiency will be lower. At this time, after querying the preset corresponding relationship between the vehicle running state and the heat exchange mode, it can be obtained that the corresponding heat exchange mode in the running mode with a slow vehicle speed is: the speed of the liquid pump, the speed of the fan, the expansion The valve openings are all reduced. That is, unnecessary power consumption of the thermal management servo system is avoided.

If the cooling demand level or heating demand level of the passenger compartment is obtained, it means that the user urgently needs to heat up or cool down at this time. This will make the heat exchange efficiency of the temperature regulation of the power battery lower. At this time, after querying the preset corresponding relationship between the vehicle operating state and the heat exchange mode, it can be obtained that the corresponding heat exchange mode is : Priority is given to providing cooling or heating to the users of the crew compartment, delaying the heat exchange process with the power battery. When the light sensitivity of the user of the passenger compartment reaches a relatively comfortable state, the heat exchange process of the power battery is performed. In order to make the user in the passenger compartment feel comfortable quickly, the fan speed of the air conditioner and the opening of the expansion valve can be increased. That is, while quickly meeting user needs and ensuring user thermal comfort, it can also ensure that the heat exchange process of the power battery will not be delayed for too long.

The greater the difference between the obtained ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery, the higher the heat exchange efficiency. At this time, after querying the corresponding relationship between the preset vehicle operating state and the heat exchange mode, it can be obtained that the corresponding heat exchange mode is: Increase the speed of the liquid pump, the speed of the fan, and the opening of the expansion valve. Correspondingly, when the difference between the ambient temperature and the current temperature of the battery cell is small, the corresponding heat exchange method is: reducing the rotational speed of the liquid pump, the rotational speed of the fan, and the opening of the expansion valve.

In the embodiment of the present disclosure, different weight values are set in advance for the speed of the vehicle, the difference between the ambient temperature and the current temperature of the battery cells, and the cooling or heating demand level of the passenger compartment. For example, when the vehicle speed is fast, the weight is p1, and when the vehicle speed is slow, the weight is p2; when the difference between the ambient temperature and the current temperature of the battery cell is large, the weight is p3, and when the difference is small, the weight is p4; the cooling or heating demand level of the passenger compartment The weight is p5 when high and p6 when low.

Then, when a variety of vehicle operating states are obtained, the comprehensive weight can be calculated by weighting according to the corresponding weights of the obtained different vehicle operating states, and then the corresponding heat exchange efficiency can be determined according to the comprehensive weight. The corresponding relationship between the preset vehicle running state and the heat exchange mode is inquired to determine the corresponding adjustment mode for the rotational speed of the liquid pump, the rotational speed of the fan, and the opening of the expansion valve.

In the process of heat exchange, the actual heat exchange of the heat exchange device and the heat produced by the battery can be obtained in the following ways:

Optionally, the actual heat exchange of the heat exchange device can be obtained in the following ways:

acquiring the first liquid temperature of the liquid inlet, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump within a first preset time period;

According to the first liquid temperature, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump, the actual heat exchange amount is obtained by integrating over the first preset time period.

Specifically, the first preset time period T may be 30s. Those skilled in the art can also set other first preset time periods according to actual needs. During the first preset time period, the vehicle VCU continuously obtains the temperature of the liquid flowing into the liquid inlet at the liquid inlet of the heat exchange liquid circulation system, and the temperature of the liquid at the liquid outlet of the heat exchange liquid circulation system through the temperature sensor of the battery. The temperature of the liquid flowing out of the liquid outlet. Liquid flow is the amount of liquid passing through the cross-section of the liquid outlet or liquid inlet per unit time. The calculation method of the liquid flow rate may refer to the prior art. The duty cycle of the liquid pump is the ratio of the time when the liquid pump is energized relative to the total time of the first preset time period in a first preset time period. In the embodiment of the present disclosure, the actual heat exchange amount of the heat exchange device within the first preset time period may be calculated in the following manner:

Optionally, in order to ensure accurate heat exchange, the heat production of the cells of the battery within the first preset time period also needs to be considered. Therefore, the heat generated by the battery can be obtained in the following ways:

Obtain the current of the battery within the first preset time period;

According to the current and the internal resistance of the battery, integration is performed over the first preset time period to obtain the heat generated by the battery.

which is,

Among them, the internal resistance of the battery is the resistance received by the current flowing through the battery when the battery is working.

It should be noted that, in the embodiment of the present disclosure, in order to ensure accurate heat exchange, excessive energy consumption is avoided for the thermal management servo system. During the process of the heat exchange between the heat exchange device and the temperature control system controlled by the thermal management servo system of the battery, the actual heat exchange and the heat production of the battery are calculated once every first preset time period.

Step S206: Determine the remaining heat exchange amount according to the heat exchange demand, the actual heat exchange amount, and the battery heat production;

In the embodiment of the present disclosure, the residual heat exchange can be calculated in the following manner:

Remaining heat exchange = heat exchange demand - actual heat exchange + battery heat production;

Among them, when the battery is cooled, the heat output of the battery is a positive value; when the battery is heated, the heat generated by the battery is a negative value. For example, when cooling the battery, the heat generated by the battery in the first preset time period is 500J. When heating the battery, the heat output of the battery in the first preset time period is -500J.

Step S207: when the remaining heat exchange amount is greater than a preset threshold, continue to control the heat exchange device to exchange heat with the temperature control system, and obtain the heat exchange during the heat exchange process. The actual heat exchange of the device and the steps of the battery to generate heat;

Step S208: when the remaining heat exchange amount is less than or equal to a preset threshold, stop the process of heat exchange.

For the implementation manner of the above steps S207-S208, refer to steps S106-S107, and details are not repeated here.

To sum up, the temperature control method of the power battery provided by the embodiment of the present disclosure is to obtain the temperature of the first cell and the temperature of the target cell of the power battery; according to the temperature of the first cell and the temperature of the target cell, determine The heat exchange demand of the power battery and the corresponding heat exchange type; control the temperature control system to perform a temperature control operation corresponding to the heat exchange type; obtain the vehicle operating state of the vehicle; according to the vehicle operating state , control the heat exchange device to exchange heat with the temperature control system in a heat exchange mode corresponding to the operating state of the vehicle, and obtain the actual exchange rate of the heat exchange device during the heat exchange process. heat and battery heat production; determine the remaining heat exchange according to the heat exchange demand, the actual heat exchange, and the battery heat production; when the remaining heat exchange is greater than a preset threshold, continue to execute control The heat exchange device exchanges heat with the temperature control system, wherein the heat exchange efficiencies corresponding to different vehicle operating states are different. And in the process of performing the heat exchange, the step of obtaining the actual heat exchange amount of the heat exchange device and the heat generated by the battery; when the remaining heat exchange amount is less than or equal to a preset threshold, the heat exchange process is stopped. In the embodiment of the present disclosure, the current heat exchange demand of the battery is pre-determined before the heat exchange process is performed, and during the heat exchange process, the current cell temperature of the battery can reach the target cell temperature. Heat exchange is determined. Therefore, during the heat exchange process, the actual heat exchange demand required by the power battery at the moment is used as the servo request condition, so as to avoid the transition servo of the thermal management servo system caused by the accuracy of the temperature sensor, and save the servo energy consumption. At the same time, in the process of heat exchange in the embodiments of the present disclosure, a corresponding heat exchange mode is also selected according to the operating state of the vehicle, so that less heat exchange can be provided when the heat exchange efficiency is low, thereby reducing the thermal management servo system. servo power consumption. When the heat exchange efficiency is high, more heat exchange is provided, thereby reducing the servo time of the thermal management servo system.

Referring to FIG. 3 , a structural block diagram of a temperature control device for a power battery provided by an embodiment of the present disclosure is shown. The device is applied to a vehicle, and the vehicle includes: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange device is coupled and connected to the temperature control system. The device 300 includes the following modules:

A first obtaining module 301, configured to obtain the temperature of the first cell of the power battery, and obtain the temperature of the target cell of the power battery;

A first determination module 302, configured to determine the heat exchange demand of the power battery according to the first cell temperature and the target cell temperature, and determine the heat exchange type corresponding to the power battery;

a control module 303, configured to control the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

The second obtaining module 304 is configured to control the heat exchange device to exchange heat with the temperature control system, and during the heat exchange process, obtain the actual heat exchange amount of the heat exchange device and the heat generated by the battery ;

A second determination module 305, configured to determine the remaining heat exchange amount according to the heat exchange demand, the heat exchange amount, and the heat generated by the battery;

The determination module 306 is configured to enter the second acquisition module when the remaining heat exchange amount is greater than a preset threshold; and stop the heat exchange process when the remaining heat exchange amount is less than or equal to the preset threshold.

Optionally, the apparatus 300 further includes:

a third acquiring module, configured to acquire the vehicle running state of the vehicle before the control of the heat exchange device to perform heat exchange with the temperature control system;

The control module 303 is further configured to: control the heat exchange device to exchange heat with the temperature control system in a heat exchange manner corresponding to the operating state of the vehicle according to the operating state of the vehicle; The heat exchange efficiency corresponding to the operating state is different.

Optionally, the third obtaining module is specifically configured to obtain the cooling demand level of the passenger compartment of the vehicle, the speed of the vehicle, and the temperature of the surrounding environment of the vehicle when the heat exchange type is a cooling type. at least one of the differences between the ambient temperature and the current cell temperature of the power battery;

The control module 303 is specifically configured to query according to at least one of the cooling demand level, the speed of the vehicle, the difference between the ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery. The preset correspondence between the vehicle operation state and the heat exchange mode determines the heat exchange mode corresponding to the vehicle operation state, and controls the heat exchange device to exchange heat with the temperature control system in the heat exchange mode.

Optionally, the heat exchange device includes a heat exchange liquid circulation system, and the heat exchange liquid circulation system includes a liquid inlet, a liquid outlet, and a liquid pump;

The second obtaining module 304 includes:

a first acquisition sub-module, for acquiring the first liquid temperature of the liquid inlet, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump within a first preset time period;

The first determination sub-module is based on the first liquid temperature, the second liquid temperature at the liquid outlet, the liquid flow rate, and the duty cycle of the liquid pump, and integrates with the first preset time period to obtain the obtained value. the actual heat exchange.

Optionally, the first acquisition module includes,

The second acquisition sub-module is used to acquire the target temperature range of the power battery; the target temperature range includes: a maximum temperature value and a minimum temperature value;

The second determination submodule is configured to use the maximum temperature value as the target cell temperature when the temperature of the first cell is greater than the maximum temperature value; when the temperature of the first cell is less than the minimum temperature When the temperature value is set, the minimum temperature value is used as the target cell temperature; when the first cell temperature is greater than or equal to the minimum temperature value and less than or equal to the maximum temperature value, the first cell temperature The core temperature is used as the target cell temperature.

Optionally, the heat exchange types include: cooling type, heating type, and no heat exchange type;

The first determining module 302 is specifically configured to determine that the heat exchange type is a cooling type when the temperature of the first cell is greater than the target cell temperature; when the temperature of the first cell is lower than the target When the cell temperature is determined, the heat exchange type is determined to be a heating type; when the first cell temperature is equal to the target cell temperature, the heat exchange type is determined to be a non-heat exchange type.

In summary, the temperature control device for a power battery provided by the embodiment of the present disclosure obtains the temperature of the first cell and the temperature of the target cell of the power battery; and determines the temperature of the first cell and the temperature of the target cell according to the temperature of the first cell and the temperature of the target The heat exchange demand of the power battery and the corresponding heat exchange type; control the temperature control system to perform a temperature control operation corresponding to the heat exchange type; control the heat exchange device to perform heat exchange with the temperature control system , and in the process of performing the heat exchange, obtain the actual heat exchange of the heat exchange device and the heat output of the battery; according to the demand for heat exchange, the actual heat exchange, and the heat output of the battery, determine Remaining heat exchange; when the remaining heat exchange is greater than a preset threshold, continue to control the heat exchange device to exchange heat with the temperature control system, and obtain the heat exchange during the heat exchange process. The steps of the actual heat exchange of the heat exchange device and the heat generation of the battery; when the remaining heat exchange is less than or equal to a preset threshold, the process of heat exchange is stopped. In the embodiment of the present disclosure, the current heat exchange demand of the battery is pre-determined before the heat exchange process is performed, and during the heat exchange process, the current cell temperature of the battery can reach the target cell temperature. Heat exchange is determined. Therefore, during the heat exchange process, the actual heat exchange demand required by the power battery at the moment is used as the servo request condition, so as to avoid the transition servo of the thermal management servo system caused by the accuracy of the temperature sensor, and save the servo energy consumption.

4, an embodiment of the present disclosure further provides an electronic device M00, including a processor M02, a memory M01, and a computer program or instruction stored on the memory M01 and executable on the processor M02, the program Or when the instruction is executed by the processor M02, each process of the above-mentioned method for controlling the temperature of the power battery can be realized, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

Referring to FIG. 5 , a schematic diagram of the hardware structure of an electronic device implementing the present disclosure is shown.

The electronic device 500 includes but is not limited to: a radio frequency unit 5001, a network module 5002, an audio output unit 5003, an input unit 5004, a sensor 5005, a display unit 5006, a user input unit 5007, an interface unit 5008, a memory 5009, a processor 5010, etc. part.

Those skilled in the art can understand that the electronic device 500 may also include a power supply (such as a battery) for supplying power to various components, and the power supply may be logically connected to the processor 5010 through a power management system, so as to manage charging, discharging, and power management through the power management system. consumption management and other functions. The structure of the electronic device shown in FIG. 6 does not constitute a limitation on the electronic device, and the electronic device may include more or less components than those shown in the figure, or combine some components, or arrange different components, which will not be repeated here. .

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

Various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a computing processing device according to embodiments of the present disclosure. The present disclosure can also be implemented as apparatus or apparatus programs (eg, computer programs and computer program products) for performing some or all of the methods described herein. Such a program implementing the present disclosure may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

For example, Figure 6 illustrates a computing processing device that may implement methods in accordance with the present disclosure. The computing processing device traditionally includes a processor 1010 and a computer program product or computer readable medium in the form of a memory 1020. The memory 1020 may be electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. The memory 1020 has storage space 1030 for program code 1031 for performing any of the method steps in the above-described methods. For example, the storage space 1030 for program codes may include various program codes 1031 for implementing various steps in the above methods, respectively. These program codes can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such computer program products are typically portable or fixed storage units as described with reference to FIG. 7 . The storage unit may have storage segments, storage spaces, etc. arranged similarly to the memory 1020 in the computing processing device of FIG. 6 . The program code may, for example, be compressed in a suitable form. Typically, the storage unit includes computer readable code 1031', ie code readable by a processor such as 1010, for example, which, when executed by a computing processing device, causes the computing processing device to perform any of the methods described above. of the various steps.

The above descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of the present disclosure. within the scope of protection.

Although alternative embodiments of the presently disclosed embodiments have been described, additional changes and modifications to these embodiments may be made by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include alternative embodiments and all changes and modifications that fall within the scope of the embodiments of the present disclosure.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any existence between these entities. This actual relationship or sequence. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that an article or terminal device comprising a list of elements includes not only those elements, but also other elements not expressly listed , or also include elements inherent to the article or terminal equipment. Without further limitation, an element defined by the phrase "comprises a..." does not preclude the presence of additional identical elements in the article or terminal device comprising the element.

The technical solutions provided by the present disclosure have been introduced in detail above, and specific examples are used to illustrate the principles and implementations of the present disclosure. There will be changes in the specific implementation manner and application scope. In conclusion, the contents of this specification should not be construed as limiting the present disclosure.

Claims (12)

1. A temperature control method for a power battery, characterized in that it is applied to a vehicle, the vehicle comprising: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange device and the temperature control system coupling; the method includes:

   acquiring the first cell temperature of the power battery, and acquiring the target cell temperature of the power battery;

   According to the temperature of the first cell and the temperature of the target cell, determine the heat exchange demand of the power battery, and determine the heat exchange type corresponding to the power battery;

   controlling the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

   Controlling the heat exchange device to exchange heat with the temperature control system, and acquiring the actual heat exchange amount of the heat exchange device and the heat generated by the battery during the heat exchange process;

   Determine the remaining heat exchange amount according to the heat exchange demand, the actual heat exchange amount, and the battery heat production;

   When the remaining heat exchange amount is greater than a preset threshold value, continue to control the heat exchange device to perform heat exchange with the temperature control system, and acquire the actual value of the heat exchange device during the heat exchange process. The steps of exchanging heat and generating heat from the battery; when the remaining heat exchange is less than or equal to a preset threshold, the process of heat exchange is stopped.
2. The method according to claim 1, characterized in that before the controlling the heat exchange device to exchange heat with the temperature control system, the method further comprises:

   obtaining the vehicle running state of the vehicle;

   The controlling the heat exchange device to exchange heat with the temperature control system includes:

   According to the vehicle operation state, the heat exchange device is controlled to exchange heat with the temperature control system in a heat exchange manner corresponding to the vehicle operation state; wherein, the heat exchange efficiencies corresponding to different vehicle operation states are different.
3. The method according to claim 2, wherein the acquiring the vehicle running state of the vehicle comprises:

   If the heat exchange type is a cooling type, obtain the cooling demand level of the vehicle passenger compartment, the vehicle speed, the ambient temperature of the surrounding environment of the vehicle, and the current cell temperature of the power battery. at least one of the differences;

   The controlling the heat exchange device to perform heat exchange with the temperature control system in a heat exchange manner corresponding to the vehicle operating state according to the vehicle operating state, comprising:

   According to at least one of the cooling demand level, the speed of the vehicle, the difference between the ambient temperature of the surrounding environment of the vehicle and the current cell temperature of the power battery, query the preset vehicle operating state and heat exchange The corresponding relationship between the modes is determined, the heat exchange mode corresponding to the running state of the vehicle is determined, and the heat exchange device is controlled to exchange heat with the temperature control system in the heat exchange mode.
4. The method according to claim 1, wherein the heat exchange device includes a heat exchange liquid circulation system, and the heat exchange liquid circulation system includes a liquid inlet, a liquid outlet, and a liquid pump; the acquiring the The actual heat exchange of the heat exchange device, including:

   acquiring the first liquid temperature of the liquid inlet, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump within a first preset time period;

   According to the first liquid temperature, the second liquid temperature of the liquid outlet, the liquid flow rate, and the duty ratio of the liquid pump, the actual heat exchange amount is obtained by integrating over the first preset time period.
5. The method according to claim 1, wherein the acquiring the target cell temperature of the power battery comprises:

   Obtain the target temperature range of the power battery; the target temperature range includes: a maximum temperature value and a minimum temperature value;

   When the temperature of the first cell is greater than the maximum temperature value, the maximum temperature value is used as the target cell temperature;

   When the temperature of the first cell is less than the minimum temperature value, the minimum temperature value is used as the target cell temperature;

   When the first cell temperature is greater than or equal to the minimum temperature value and less than or equal to the maximum temperature value, the first cell temperature is used as the target cell temperature.
6. The method according to claim 1, wherein the heat exchange types include: cooling type, heating type, and no heat exchange type;

   The determining of the heat exchange type corresponding to the power battery includes:

   When the temperature of the first cell is greater than the temperature of the target cell, determining that the heat exchange type is a cooling type;

   When the temperature of the first cell is lower than the temperature of the target cell, determining that the heat exchange type is a heating type;

   When the first cell temperature is equal to the target cell temperature, it is determined that the heat exchange type is a non-heat exchange type.
7. A temperature control device for a power battery, characterized in that it is applied to a vehicle, the vehicle comprising: a power battery, a heat exchange device wrapping the power battery, and a temperature control system; the heat exchange device and the temperature control system coupled connection; the device includes:

   a first obtaining module, configured to obtain the temperature of the first cell of the power battery and obtain the temperature of the target cell of the power battery;

   a first determination module, configured to determine the required heat exchange amount of the power battery and the corresponding heat exchange type according to the first cell temperature and the target cell temperature;

   a control module, configured to control the temperature control system to perform a temperature control operation corresponding to the heat exchange type;

   a second acquisition module, configured to control the heat exchange device to exchange heat with the temperature control system, and acquire the actual heat exchange amount of the heat exchange device and the heat generated by the battery during the heat exchange process;

   a second determining module, configured to determine the remaining heat exchange amount according to the heat exchange demand, the heat exchange amount, and the heat generated by the battery;

   The judgment module is configured to enter the second acquisition module when the remaining heat exchange amount is greater than a preset threshold; and stop the heat exchange process when the remaining heat exchange amount is less than or equal to the preset threshold.
8. The device according to claim 7, wherein the device further comprises:

   a third acquiring module, configured to acquire the vehicle running state of the vehicle before the control of the heat exchange device to perform heat exchange with the temperature control system;

   The control module is further configured to: control the heat exchange device to exchange heat with the temperature control system in a heat exchange manner corresponding to the vehicle operation state according to the vehicle operation state; wherein different vehicles operate The heat transfer efficiency corresponding to the state is different.
9. The device according to claim 7, wherein the heat exchange device comprises a hydrothermal circulation system, and the hydrothermal circulation system comprises a liquid inlet, a liquid outlet, and a liquid pump.
10. An electronic device, characterized in that it includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being executed by the processor to achieve the right The steps of the temperature control method of the power battery according to any one of requirements 1-6.
11. A computer program, comprising computer readable code, which, when the computer readable code is run on a computing processing device, causes the computing processing device to perform the temperature control of the power battery according to any one of claims 1-6 steps of the method.
12. A readable storage medium, characterized in that a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the computer program according to claim 11 is implemented.

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