CN115065108B

CN115065108B - Battery temperature control method, device and vehicle

Info

Publication number: CN115065108B
Application number: CN202111439920.XA
Authority: CN
Inventors: 陈明; 孙明
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2025-04-11
Anticipated expiration: 2041-11-30
Also published as: CN115065108A

Abstract

The application relates to the technical field of new energy automobiles, and provides a battery temperature control method, a device and a vehicle. The battery temperature control method includes the steps of responding to a charging request, obtaining first duration of reaching a target charging pile, first electric quantity required to be consumed by the target charging pile, current electric quantity of a battery, current temperature of the battery and target electric quantity of the battery, determining the target temperature of the battery based on the target electric quantity of the battery, the current electric quantity of the battery and the first electric quantity, determining target cooling power of the battery based on the target temperature of the battery, the current temperature of the battery and the first duration, and controlling the temperature of the battery based on the target cooling power. According to the embodiment of the application, the battery temperature is cooled in advance, so that the battery temperature can reach the temperature suitable for charging as soon as possible, the waiting time of the vehicle after reaching the charging pile is reduced, and the charging efficiency is improved.

Description

Battery temperature control method and device and vehicle

Technical Field

The application relates to the technical field of new energy automobiles, in particular to a battery temperature control method and device and a vehicle.

Background

With the increasing popularization of pure electric vehicles in China, the charging time of the electric vehicle becomes the focus of attention of users, and the reduction of the quick charging time of the electric vehicle not only can relieve the charging anxiety of the users, but also can reduce the mileage anxiety, so that the electric vehicle achieves the same vehicle experience as a fuel vehicle. At present, when the electric vehicle needs to be charged quickly, especially in a high-temperature area, the initial temperature of a battery pack of the electric vehicle is higher, the charging power is limited, and the electric vehicle needs to wait for an air conditioning system to refrigerate the battery pack to reach a proper charging temperature before charging, so that a part of time is wasted undoubtedly, the charging time is prolonged, and the user experience is influenced.

Disclosure of Invention

The application provides a battery temperature control method, a battery temperature control device and a vehicle, which can cool the battery of the vehicle in advance, so that the battery temperature can reach the temperature suitable for charging as soon as possible, the waiting time of the vehicle after reaching a charging pile is reduced, and the charging efficiency is improved.

The application provides a battery temperature control method, which comprises the steps of responding to a charging request, obtaining first time length for reaching a target charging pile, first electric quantity required to be consumed for reaching the target charging pile, current electric quantity of a battery, current temperature of the battery and target electric quantity of the battery, wherein the target electric quantity of the battery is the target electric quantity of the battery when the battery is charged, determining the target temperature of the battery based on the target electric quantity of the battery, the current electric quantity of the battery and the first electric quantity, determining target cooling power of the battery based on the target temperature of the battery, the current temperature of the battery and the first time length, and controlling the temperature of the battery based on the target cooling power.

According to the embodiment of the application, after the first duration, the first electric quantity, the current electric quantity of the battery, the current temperature of the battery and the target electric quantity of the battery are obtained, the target temperature of the battery is determined based on the target electric quantity of the battery, the current electric quantity of the battery and the first electric quantity. Then, a target cooling power for the battery is determined based on the battery target temperature, the battery current temperature, and the first time period, and the battery is temperature-controlled based on the target cooling power. Therefore, according to the battery temperature control method, the battery temperature can be cooled in advance before the vehicle reaches the target charging pile, so that the battery temperature can reach the temperature suitable for charging as soon as possible, the waiting time of the vehicle after reaching the charging pile is reduced, and the charging efficiency is improved.

In one possible implementation manner, the determining the battery target temperature based on the battery target power, the current power of the battery and the first power includes calculating a required charging power of the battery according to the battery target power, the current power of the battery and the first power, determining a charging power of the battery according to the required charging power and a preset charging time, and determining the battery target temperature according to the charging power.

In one possible implementation manner, the determining the target temperature of the battery according to the charging power includes determining a power interval corresponding to the charging power, obtaining charging temperatures corresponding to the power intervals, each power interval corresponding to a preset charging temperature, and determining the charging temperature corresponding to the power interval as the target temperature of the battery.

In one possible implementation manner, the method for determining the target cooling power of the battery based on the target battery temperature, the current battery temperature and the first time period comprises the steps of determining a change value of the battery temperature according to the current battery temperature and the target battery temperature, calculating work required for the battery according to the weight of the battery core, the specific heat capacity of the battery core and the change value of the battery temperature, and determining the target cooling power according to the work required for the battery and the first time period.

In one possible implementation, the temperature control of the battery based on the target cooling power includes determining a target flow and a target inlet temperature based on the target cooling power, wherein the target flow is a flow of a liquid for cooling the battery, the target inlet temperature is a target temperature of the liquid before cooling the battery, and the temperature control of the battery is performed by adjusting the target flow and the target inlet temperature.

In one possible implementation manner, the temperature control of the battery is performed by adjusting the target flow and the target inlet temperature, and the method comprises the steps of determining a water pump on duty ratio according to the target flow, determining a compressor rotating speed according to a difference value between an actual inlet temperature and the target inlet temperature and a change rate of the actual inlet temperature, wherein the actual inlet temperature is the actual temperature of liquid before cooling the battery, and performing the temperature control of the battery by adjusting the water pump on duty ratio and the compressor rotating speed.

For example, the water pump on duty cycle may be determined based on k=d×l _t +e, K is the water pump on duty cycle, L _t is the target flow, and d and e are preset coefficients.

In one possible implementation manner, the determining the rotation speed of the compressor according to the difference between the actual inlet temperature and the target inlet temperature and the change rate of the actual inlet temperature includes determining a plurality of preset temperature spaces corresponding to the difference, each of the preset temperature spaces being different, determining a plurality of preset change rate spaces corresponding to the change rate, each of the preset change rate spaces being different, and adjusting the rotation speed of the compressor according to the preset temperature spaces corresponding to the difference and the preset change rate spaces corresponding to the change rate.

In one scenario, when the difference is greater than or equal to a first preset temperature, if the change rate is less than or equal to a first preset change rate, the rotation speed of the compressor is increased by Δt2×f, Δt2 is the rotation speed corresponding to Δt2, f is a preset coefficient, if the change rate is greater than or equal to a second preset change rate, the rotation speed of the compressor is decreased by Δt2×f, and if the change rate is greater than the first preset change rate and less than the second preset change rate, the rotation speed of the compressor is not adjusted, wherein the second preset change rate is greater than the first preset change rate.

In another scenario, when the difference is located in the first temperature interval, if the change rate is smaller than or equal to a first preset change rate, the rotation speed of the compressor is increased by a first preset rotation number, if the change rate is larger than or equal to the first preset change rate, the rotation speed of the compressor is decreased by the first preset rotation number, and if the change rate is larger than the first preset change rate and smaller than a second preset change rate, the rotation speed of the compressor is not adjusted, wherein the maximum value of the first temperature interval is the first preset temperature.

In another scenario, when the difference is in the second temperature interval, if the change rate is smaller than or equal to the first preset change rate, the rotation speed of the compressor is increased by a second preset rotation number, if the change rate is larger than or equal to the second preset change rate, the rotation speed of the compressor is decreased by the second preset rotation number, and if the change rate is larger than the first preset change rate and smaller than the second preset change rate, the rotation speed of the compressor is not adjusted. The second preset revolution is smaller than the first preset revolution, the maximum value of the second temperature interval is smaller than or equal to the minimum value of the first temperature interval, and the minimum value of the second temperature interval is larger than 0 ℃.

In another scenario, when the difference is in the third temperature interval, if the rate of change is less than or equal to a third preset rate of change, the rotational speed of the compressor is increased by a third preset rotational speed, if the rate of change is greater than or equal to the first preset rate of change, the rotational speed of the compressor is decreased by a fourth preset rotational speed, and if the rate of change is greater than the third preset rate of change and less than the first preset rate of change, the rotational speed of the compressor is not adjusted. Wherein the maximum value of the third temperature interval is less than or equal to the minimum value of the second temperature interval, and the minimum value of the third temperature interval is greater than 0 ℃.

In another scenario, if the difference is within the fourth temperature range, the rotational speed of the compressor is not adjusted. Wherein the maximum value of the fourth temperature interval is less than or equal to the minimum value of the third temperature interval, and the minimum value of the fourth temperature interval is less than 0 ℃.

In still another scenario, when the difference is less than or equal to the second preset temperature, if the rate of change is less than or equal to the third preset rate of change, the rotational speed of the compressor is reduced by a fifth preset rotational number, if the rate of change is greater than or equal to the first preset rate of change, the rotational speed of the compressor is reduced by a sixth preset rotational number, and if the rate of change is greater than the third preset rate of change and less than the first preset rate of change, the rotational speed of the compressor is reduced by a seventh preset rotational number. The second preset temperature is smaller than the minimum value of the fourth temperature interval, the sixth preset revolution is larger than the seventh preset revolution, and the seventh preset revolution is larger than the fifth preset revolution.

The application provides a battery temperature control device, which comprises an acquisition module, a cooling power determination module and a temperature control module, wherein the acquisition module is used for responding to a charging request, acquiring a first duration of reaching a target charging pile, a first electric quantity required to be consumed for reaching the target charging pile, a current battery electric quantity, a current battery temperature and a target battery electric quantity, the target battery electric quantity is the target electric quantity of a battery at the end of battery charging, the target temperature determination module is used for determining the target battery temperature based on the target battery electric quantity, the current battery electric quantity and the first electric quantity, the target battery temperature is the target battery temperature at the beginning of battery charging, the cooling power determination module is used for determining the target cooling power of the battery based on the target battery temperature, the current battery temperature and the first duration, and the temperature control module is used for performing temperature control on the battery based on the target cooling power.

In a third aspect, the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect when executing the computer program.

In a fourth aspect, an embodiment of the present application provides a vehicle comprising an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect when executing the computer program.

In a fifth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above in the first aspect or any one of the possible implementations of the first aspect.

In a sixth aspect, embodiments of the present application provide a computer program product having a program code for performing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect, when the program code is run in a corresponding processor, controller, computing device or electronic apparatus.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an application scenario of a battery temperature control method according to an embodiment of the present application;

Fig. 2 is a schematic diagram of an architecture related to a battery temperature control method according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a battery temperature control method according to an embodiment of the present application;

Fig. 4 is a flowchart of an implementation of a battery temperature control method according to an embodiment of the present application;

FIG. 5 is a battery cooling circuit provided in an embodiment of the present application;

FIG. 6 is yet another battery cooling circuit provided by an embodiment of the present application;

FIG. 7 is yet another battery cooling circuit provided by an embodiment of the present application;

Fig. 8 is a schematic structural view of a battery temperature control device according to an embodiment of the present application;

fig. 9 is a schematic diagram of an electronic device according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.

Fig. 1 shows an application scenario of a battery temperature control method provided by an embodiment of the present application. Referring to fig. 1, a vehicle 10 and a charging pile 20 may be included in the application scenario. During the user driving the vehicle 10, the charge of the battery of the vehicle 10 may decrease and the temperature may increase. When the battery power decreases to the threshold value, it indicates that the battery is required to be charged when the battery power is low, and the vehicle 10 can remind the user to charge the battery, for example, the intelligent temperature control charging mode of the vehicle 10 is started to remind the user to charge the battery.

After the intelligent temperature-controlled charging mode is turned on, the vehicle 10 may actively search for a charging pile in the vicinity of the vehicle and display the searched charging pile to the user. After the user selects the target charging stake 20, the vehicle 10 generates a navigation path of the current vehicle location to the target charging stake 20. In order to reduce the waiting time before charging, the vehicle 10 may cool the battery by using the above-mentioned battery temperature control method on the way to the target charging pile 20. When the vehicle 10 reaches the target charging stake 20, the battery temperature drops to a temperature suitable for charging, and the battery can be immediately charged, reducing the waiting time before charging, thereby reducing the charging waiting time of the user. Experiments prove that when the vehicle 10 reaches the target charging pile 20, the temperature of the battery is suitable for charging, and the charging waiting time can be saved by about one fourth.

Fig. 2 is a schematic diagram of an architecture related to a battery temperature control method according to an embodiment of the present application. The process of cooling the battery by the vehicle 10 according to the battery temperature control method may be implemented based on the architecture shown in fig. 2.

Referring to fig. 2, the architecture may include a battery cooler 101, a low temperature radiator 110, a condenser 104, a water-cooled condenser 108, an electronic fan 111, an electric compressor 102, an electronic water pump 109, a one-way valve 105, a three-way proportional valve 103, an electronic expansion valve 107, a three-way valve 106, and the like. The three-way proportional valve 103 can be a valve body which is gradually adjusted, and can realize the functions of three-way opening, two-way and the like. The above-described architecture constitutes a cooling circuit of the battery.

Specifically, the battery cooler 101 is communicated with the battery 200 to cool the battery 200, and the battery cooler 101 is also communicated with the first valve port 1 of the three-way proportional valve 103 through the electric compressor 102. The second valve port 2 of the three-way proportional valve 103 is communicated with the condenser 104, and the condenser 104 is communicated with the second port 2 of the three-way valve 106 through the one-way valve 105. The third port 3 of the three-way valve 106 communicates with the battery cooler 101 through an electronic expansion valve 107. The third valve port 3 of the three-way proportional valve 103 is in communication with the first inlet of the water-cooled condenser 108, and the first outlet of the water-cooled condenser 108 is in communication with the first port 1 of the three-way 106. The second outlet of the water-cooled condenser 108 communicates with the inlet of the low temperature radiator 110 through the electronic water pump 109, and the outlet of the low temperature radiator 110 communicates with the second inlet of the water-cooled condenser 108. The electronic fan 111 is provided corresponding to the condenser 104.

For how to cool the battery by the architecture shown in fig. 2, please refer to the following description, and the description is omitted here.

The battery temperature control method provided in the embodiment of the present application is described in detail below with reference to fig. 1 and 2.

Referring to fig. 3, a flowchart of an implementation of a battery temperature control method according to an embodiment of the present application is shown, and details are as follows:

Step 301, in response to a charging request, obtaining a first duration of time to reach a target charging pile, a first electric quantity required to be consumed to reach the target charging pile, a current electric quantity of a battery, a current temperature of the battery and a target electric quantity of the battery.

For example, the charge request may be generated when the vehicle battery level is less than a threshold. For example, the Charge request may specifically be a Charge request actively generated by the vehicle VCU (Vehicle Control Unit ) when the battery SOC (State of Charge) is smaller than a threshold value. For another example, the charge request may specifically be that the vehicle VCU responds to a battery charge command input by a user when the battery SOC is less than a threshold value.

In one scenario, a BMS (Battery management system) of a vehicle may detect a Battery SOC in real time, and when the Battery SOC is less than a threshold, send information that the Battery SOC is less than the threshold to a vehicle VCU, and the vehicle VCU may control an intelligent temperature-controlled charging mode to be turned on according to the information, so as to remind a user to charge the Battery. At this time, the user may manually input or voice input a battery charge command, and the VCU prepares for battery charging in response to the battery charge command.

The first time period is the time required for the vehicle to travel from the current position to the target charging pile.

For example, the VCU starts the vehicle navigation and searches for a charging pile near the location of the vehicle in response to the charging request, and displays the searched charging pile on a central control screen of the vehicle, so that the user can select a target charging pile. After the user determines the target charging pile, the VCU determines a time t ₁ for the vehicle to reach the target charging pile according to the position of the target charging pile, the current position of the vehicle, and the vehicle speed. The VCU may further obtain a time t ₂ when the vehicle provided by the vehicle navigation reaches the target charging pile, and then determine the first duration t according to a minimum value of the time t ₁ and the time t ₂. It is considered that if the first time period t is determined according to the maximum value of time period t ₁ and time period t ₂, it is likely that there is a time period during which the vehicle actually reaches the target charging pile faster than the maximum value, resulting in that the battery still does not reach the optimum temperature.

The first electric quantity is the electric quantity required to be consumed by the vehicle from the current position to the target charging pile.

For example, the VCU may calculate the distance L from the vehicle to the target charging pile according to the position of the target charging pile and the current position of the vehicle, and then calculate the first electric quantity S _L =lxn according to the product of the unit distance electricity consumption data n and the distance L.

It should be noted that, when the first electric quantity S _L is greater than or equal to the current electric quantity S of the battery, the intelligent temperature control charging mode may be turned off to support the vehicle to reach the target charging pile as much as possible, so as to avoid that the vehicle is difficult to reach the target charging pile smoothly due to excessive power consumption of the air conditioning system. Or when the first electric quantity S _L is larger than or equal to the current electric quantity S of the battery, detecting whether a charging pile with a closer distance exists, and if the charging pile with the closer distance exists, reminding a user to replace the target charging pile.

Referring to fig. 4, the current charge of the battery and the current temperature of the battery may be acquired through the BMS. For example, after receiving the charging request, the VCU requests the BMS to obtain the current charge of the battery and the current temperature of the battery. The BMS transmits the charge and temperature of the battery to the VCU in response to the request of the VCU. Wherein the current temperature of the battery may be determined based on battery temperature data for a preset period of time. For example, the time when the BMS receives the request of the VCU is the first time, and the BMS may use the average value of the battery temperature data according to a preset period of time before the first time as the current temperature of the battery.

In this step, the target battery power is the target power of the battery at the end of battery charging, and may be the preset power (for example, 80%) when the vehicle leaves the factory or the power (for example, 90%) set by the user, which is not limited.

Step 302, determining a battery target temperature based on a battery target power, a battery current power, and a first power.

The target temperature of the battery may be a target temperature of the battery at the start of charging the battery. Wherein, the charging power to the battery is different, and the corresponding battery target temperature is different. The higher the charge power to the battery, the lower the corresponding battery target temperature. Specific values of the battery target temperature may be referred to as follows in table 1.

In some embodiments, step 302 may include calculating a required charge level of the battery based on a target level of the battery, a current level of the battery, and the first level of the battery, determining a charge power to the battery based on the required charge level and a preset charge time, and determining a target temperature of the battery based on the charge power.

For example, the required charge power Δs=s _t-(S-S_L),(S-S_L of the battery is the remaining power of the battery after the vehicle runs to the target charging pile under the conditions of the current power S and the first power S _L of the battery, and the required charge power Δs of the battery is obtained by subtracting (S-S _L) the target power S _t of the battery.

After the required charge quantity DeltaS of the battery is obtained, the charge power P= DeltaS/t _c of the battery can be determined according to the relation between the energy and the power. The preset charging time t _c is not limited, and may be a charging time preset when the vehicle leaves the factory (for example, 0.5 hour), or a charging time set by the user in the charging management mode (for example, 0.5 hour).

For example, the preset charging time may be plural, and the charging modes may correspond to the fast charging mode and the slow charging mode, respectively. For example, the corresponding charging model can be determined based on the region where the target charging pile is located, so that the corresponding preset charging time is obtained, the intelligent degree of battery charging is improved, and therefore user experience is improved.

For example, if the target charging pile is located in a first type of area such as the vicinity of the residence of the user, a charging mode of slow charging may be employed, resulting in a relatively long preset charging time. If the target charging pile is located in a second type of area such as the vicinity of a mall, a charging mode of rapid charging can be adopted, so that a relatively short preset charging time is obtained.

In addition, for the case that the target charging pile is located in the first type area, a charging mode of rapid charging can be adopted, so that a relatively short preset charging time is obtained.

After obtaining the charging power P of the battery, the battery target temperature T corresponding to the charging power P may be determined by a relationship between the charging power and the battery temperature calibrated in advance.

Specifically, the determining the target temperature of the battery according to the charging power may include determining a power interval corresponding to the charging power, obtaining a charging temperature corresponding to the power interval, each power interval corresponding to a preset charging temperature, and determining the charging temperature corresponding to the power interval as the target temperature of the battery.

Referring to Table 1, in the relationship between the pre-calibrated charging power and the battery temperature, the charging power may correspond to four power intervals, respectively, 300KW is greater than or equal to P is greater than or equal to 200KW, 200KW is greater than or equal to 150KW, 150KW is greater than or equal to 100KW, and 100KW is greater than or equal to P. Each power interval corresponds to a battery temperature of T _b1＝25℃、T_b2＝28℃、T_b3 = 31 ℃ and T _b4 = 35 ℃, respectively. The charging power is divided into the range of 5% to 80% in table 1, the charging time is 15 minutes to 30 minutes, and the higher the target temperature of the battery is, the lower the energy consumption of the consumed air conditioning system is correspondingly.

TABLE 1 relationship between charging power and target battery temperature

Charging power	Target temperature of battery
		300KW≥P≥200KW	T_b1=25°C
200KW>P≥150KW	T_b2=28°C
		150KW>P≥100KW	T_b3=31°C
100KW>P	T_b4=35°C

It should be noted that the data in table 1 is only an exemplary illustration, and the data in table 1 is not particularly limited in the embodiments of the present application. The higher the charging power, the lower the target temperature of the battery, and the data in table 1 can be adjusted by those skilled in the art according to the idea and actual needs to be applied to the product, which is within the scope of the claims of the present application.

In step 303, a target cooling power for the battery is determined based on the battery target temperature, the battery current temperature, and the first time period.

In some embodiments, step 303 may include determining a change in battery temperature based on the current temperature of the battery and the target temperature of the battery, calculating work required for the battery based on the weight of the battery cell, the specific heat capacity of the battery cell, and the change in battery temperature, and determining the target cooling power based on the work required for the battery and the first time period.

The difference between the current temperature T ₁ of the battery and the target temperature T of the battery can be calculated, and the change value of the temperature of the battery is determined to be T ₁ -T. The work required by the battery can be calculated by the weight of the battery cell, the specific heat capacity of the battery cell and the change value of the battery temperature. Specifically, the work required to be done on the battery is equal to (T ₁ -T) m c, c is the specific heat capacity of the cell, m is the equivalent weight of the battery, m=m _{Battery cell} a/b, a is the number of batteries in the battery pack, m _{Battery cell} is the weight of the cell, and b is the duty cycle of the weight of the cell in the weight of the battery. After the work (T ₁ -T) m c required by the battery is obtained, dividing the work required by the battery by the first time period T to obtain the target cooling power

It should be noted that the values of b and c corresponding to different batteries may be different, for example, in the embodiment of the present application, b may be 0.95, and c may be determined according to the data provided by the battery manufacturer.

Step 304, temperature control is performed on the battery based on the target cooling power.

After the target cooling power is determined, the temperature of the battery can be controlled based on the architecture shown in fig. 2, so that the temperature of the battery is reduced to the target temperature of the battery when the vehicle reaches the target charging pile.

In some embodiments, step 304 may include determining a target flow rate and a target inlet temperature based on the target cooling power, the target flow rate being a flow rate of the liquid for cooling the battery, the target inlet temperature being a target temperature of the liquid prior to cooling the battery, and controlling the temperature of the battery by adjusting the target flow rate and the target inlet temperature.

After the target cooling power is obtained, the target flow and the target inlet temperature corresponding to the target cooling power can be determined through the relationship among the target cooling power, the target flow and the target inlet temperature calibrated in advance.

Referring to Table 2, in the relationship among the target cooling power P _c, the target flow rate, and the target inlet temperature, which are calibrated in advance, the target cooling power P _c may correspond to four cooling power intervals, namely, P _c≥9KW、9KW＞P_c≥7KW、7KW＞P_c be greater than or equal to 5KW and 5KW > P _c be greater than or equal to 3KW, respectively. Each cooling power interval corresponds to a target flow rate of L _t＝MAX、L_t＝20l/min、L_t =17L/min and L _t =15L/min, respectively, and a target inlet water temperature of T _w1＝10℃、T_w1＝13℃、T_w1 =15 ℃ and T _w1 =20 ℃, respectively.

TABLE 2 target flow and target inlet temperature relationship table

Target cooling power P _c	Target flow rate	Target inlet water temperature
			P_c≥9KW	L_t=MAX	T_w1=10°C
9KW>P_c≥7KW	L_t=20l/min	T_w1=13°C
			7KW>P_c≥5KW	L_t=17l/min	T_w1=15°C
5KW>P_c≥3KW	L_t=15l/min	T_w1=20°C

It should be noted that the data in table 2 is only an exemplary illustration, and the data in table 2 is not particularly limited in the embodiments of the present application. The larger the target cooling power, the larger the corresponding target flow and the lower the corresponding target inlet temperature, and the person skilled in the art can adjust the data in table 2 according to the idea and actual need to apply the data in the product, which is within the scope of protection of the claims of the present application.

The temperature control of the battery by adjusting the target flow rate and the target inlet temperature may include determining a water pump on duty ratio according to the target flow rate, determining a compressor rotation speed according to a difference between an actual inlet temperature and the target inlet temperature and a change rate of the actual inlet temperature, and controlling the temperature of the battery by adjusting the water pump on duty ratio and the compressor rotation speed. Wherein the actual inlet temperature is the actual temperature of the liquid before the battery is cooled.

After the target flow is obtained, the water pump opening duty ratio corresponding to the target flow can be determined through the relation between the target flow calibrated in advance and the water pump opening duty ratio.

Referring to table 3, in the relationship between the target flow rate and the water pump on duty ratio calibrated in advance, the target flow rate L _t may correspond to four flow rate intervals, L _t＝MAX、L_t＝20l/min、L_t =17L/min and L _t =15L/min, respectively. Each flow interval corresponds to a water pump on duty cycle of k=85%, k=70%, k=65% and k=55%, respectively. The water pump on duty ratio may be determined based on k= (d×l _t +e) ×100%, where L _t is a target flow rate, and d and e are preset coefficients. Illustratively, d may have a value of 0.028 and e may have a value of 0.15.

TABLE 3 relation of target flow and Water Pump on duty

Target flow rate	Duty cycle of water pump on
		L_t=MAX	K=85%
L_t=20l/min	K=70%
		L_t=17l/min	K=65%
L_t=15l/min	K=55%

It should be noted that the data in table 3 is only an exemplary illustration, and the data in table 3 is not particularly limited in the embodiments of the present application. The larger the target flow, the larger the corresponding water pump on duty cycle, and the person skilled in the art can adjust the data in table 3 according to the idea and actual need to apply the data to the product, which is within the scope of the claims of the present application.

After the difference between the actual inlet temperature and the target inlet temperature and the change rate of the actual inlet temperature are obtained, the compressor rotation speed can be determined through the relationship among the pre-calibrated difference, the change rate and the compressor rotation speed.

Specifically, the method comprises the steps of determining a plurality of preset temperature spaces corresponding to differences, wherein the number of the preset temperature spaces is different, determining a plurality of preset change rate spaces corresponding to change rates, and adjusting the rotating speed of the compressor according to the preset temperature spaces corresponding to the differences and the preset change rate spaces corresponding to the change rates.

For example, the first preset temperature may be 15 ℃, f may take a value of 55, the first preset rate of change may be 3 ℃ per 5 seconds (i.e., 3 ℃ in 5 seconds), and the first preset rate of change may be 6 ℃ per 5 seconds (i.e., 6 ℃ in 5 seconds).

For example, the first temperature interval may be 10 ℃ to 15 ℃, and the first preset rotation number may be 400 rotations.

For example, the second temperature interval may be 5 ℃ to 10 ℃, and the second preset rotation number may be 250 rotations.

For example, the second temperature interval may be 1 ℃ to 5 ℃, the third preset rate of change may be 1.5 ℃ per 5 seconds (i.e., 5 seconds varies by 1.5 ℃), the third preset number of revolutions may be 110 revolutions, and the third preset number of revolutions may be 100 revolutions.

The fourth temperature interval may be-1 ℃ to 1 ℃ for example.

For example, the second preset temperature may be-1 ℃, the fifth preset rotation number may be 150 rotations, the sixth preset rotation number may be 400 preset rotation numbers, and the seventh preset rotation number may be 250 rotations.

Referring to table 4, in the relationship between the pre-calibrated difference Δt1, the rate of change Δt2, and the compressor rotation speed, a rapid cooling stage and a warm-up stage for the battery can be classified. For example, a case where Δt1 is greater than or equal to 5 ℃ may be defined as a rapid cooling stage, and a case where Δt1 is less than 5 ℃ may be defined as a warm stage.

Table 4 compressor speed regulator

1. Quick cooling stage

The rapid cooling stage is divided into three sections according to a difference value delta T1, wherein the difference value delta T1 corresponding to the three sections is respectively larger than or equal to 15 ℃, the difference value delta T1 is in a range of 10-15 ℃, and the difference value delta T1 is in a range of 5-10 ℃. For each section, the section is divided into three sub-sections according to the change rate delta T2, wherein the change rates delta T2 corresponding to the three sub-sections are respectively that the change rate delta T2 is smaller than or equal to 3 ℃ per 5 seconds, the change rate delta T2 is larger than or equal to 6 ℃ per second, and the change rate delta T2 is larger than 3 ℃ per 5 seconds and smaller than 6 ℃ per 5 seconds.

The following describes how the compressor speed is adjusted during the rapid cooling phase.

When the difference delta T1 is larger than or equal to 15 ℃, if the change rate delta T2 is smaller than or equal to 3 ℃ per second, the rotation speed of the compressor is regulated to be higher by delta T2 by 55, if the change rate delta T2 is larger than or equal to 6 ℃ per second, the rotation speed of the compressor is regulated to be lower by delta T2 by 55, and if the change rate delta T2 is larger than 3 ℃ per second and smaller than 6 ℃ per second, the rotation speed of the compressor is not regulated.

When the difference delta T1 is in the range of 10-15 ℃, if the change rate delta T2 is less than or equal to 3 ℃ per 5 seconds, the rotating speed of the compressor is regulated by 400 turns, if the change rate delta T2 is greater than or equal to 6 ℃ per 5 seconds, the rotating speed of the compressor is regulated by 400 turns, and if the change rate delta T2 is greater than 3 ℃ per 5 seconds and less than 6 ℃ per 5 seconds, the rotating speed of the compressor is not regulated.

When the difference delta T1 is in the range of 5-10 ℃, the rotation speed of the compressor is regulated to 250 revolutions if the change rate delta T2 is smaller than or equal to 3 ℃ per 5 seconds, the rotation speed of the compressor is regulated to 250 revolutions if the change rate delta T2 is larger than or equal to 6 ℃ per 5 seconds, and the rotation speed of the compressor is not regulated if the change rate delta T2 is larger than 3 ℃ per 5 seconds and smaller than 6 ℃ per 5 seconds.

2. Thermal insulation stage

The heat preservation stage is divided into three sections according to the difference value delta T1, wherein the difference value delta T1 corresponding to the three sections is respectively in a range of 1-5 ℃, a range of-1 ℃ and a range of-1 ℃ or less than or equal to-1 ℃. For each section, the section is divided into three sub-sections according to the change rate delta T2, wherein the change rates delta T2 corresponding to the three sub-sections are respectively that the change rate delta T2 is smaller than or equal to 1.5 ℃ per 5 seconds, the change rate delta T2 is larger than or equal to 3 ℃ per 5 seconds, and the change rate delta T2 is larger than 1.5 ℃ per 5 seconds and smaller than 3 ℃ per 5 seconds.

The following describes how the compressor speed is adjusted during the warm-up phase.

When the difference delta T1 is in the range of 1-5 ℃, the rotation speed of the compressor is increased by 110 turns if the change rate delta T2 is smaller than or equal to 1.5 ℃ per 5 seconds, the rotation speed of the compressor is decreased by 100 turns if the change rate delta T2 is larger than or equal to 3 ℃ per 5 seconds, and the rotation speed of the compressor is not adjusted if the change rate delta T2 is larger than 1.5 ℃ per 5 seconds and smaller than 3 ℃ per 5 seconds.

If the difference delta T1 is within the range of-1 ℃ to 1 ℃, the rotation speed of the compressor is not regulated.

When the difference DeltaT 1 is less than or equal to-1 ℃, the rotation speed of the compressor is regulated down by 150 turns if the change rate DeltaT 2 is less than or equal to 1.5 ℃ per 5 seconds, the rotation speed of the compressor is regulated down by 400 turns if the change rate DeltaT 2 is greater than or equal to 3 ℃ per 5 seconds, and the rotation speed of the compressor is regulated down by 250 turns if the change rate DeltaT 2 is greater than 1.5 ℃ per 5 seconds and less than 3 ℃ per 5 seconds.

It should be noted that the data in table 4 is only an exemplary illustration, and the data in table 4 is not particularly limited in the embodiments of the present application. The change rate interval corresponding to the rapid cooling stage is larger than the change rate interval corresponding to the heat preservation stage, and because the battery temperature in the heat preservation stage is relatively close to the battery target temperature, the battery temperature needs to be finely controlled. The person skilled in the art can adapt the data in table 4 for use in products according to this idea and the actual need, which are all within the scope of the application as claimed.

In addition, the temperature control of the battery in step 304 may further include control of an electronic expansion valve and an electronic fan. The control strategy of the electronic expansion valve and the electronic fan is similar to the traditional charging strategy, and the control is performed by monitoring the superheat degree of the outlet of the battery cooler and the high-low pressure of the air conditioner, so that the description is omitted.

Three battery cooling circuits are described below with reference to fig. 5 to 7.

Referring to fig. 5, the first battery cooling circuit is an electric compressor 102, a three-way proportional valve 103, a condenser 104, a one-way valve 105, a three-way valve 106, an electronic expansion valve 107, a battery cooler 101 and an electric compressor 102.

Referring to fig. 6, the second battery cooling circuit comprises a battery cooler 101, an electric compressor 102, a three-way proportional valve 103, a water-cooled condenser 108, a three-way valve 106, an electronic expansion valve 107 and the battery cooler 101.

Referring to fig. 7, the third battery cooling circuit comprises a battery cooler 101, an electric compressor 102, a three-way proportional valve 103, a water-cooled condenser 108, an electronic water pump 109, a low-temperature radiator 110, a water-cooled condenser 108, a three-way valve 106, an electronic expansion valve 107 and the battery cooler 101.

The three battery cooling loops can be used as batteries for cooling based on the determined compression ratio of the water pump, the rotation speed of the compressor and the control strategy of the electronic expansion valve and the electronic fan. The three battery cooling circuits may be used alone to cool the battery or in combination to cool the battery, which is not limited in the embodiment of the present application.

According to the battery temperature control method, after the first duration, the first electric quantity, the current electric quantity of the battery, the current temperature of the battery and the target electric quantity of the battery are obtained, the target temperature of the battery is determined based on the target electric quantity of the battery, the current electric quantity of the battery and the first electric quantity. Then, a target cooling power for the battery is determined based on the battery target temperature, the battery current temperature, and the first time period, and the battery is temperature-controlled based on the target cooling power. Therefore, according to the battery temperature control method, the battery temperature can be cooled in advance before the vehicle reaches the target charging pile, so that the battery temperature can reach the temperature suitable for charging as soon as possible, the waiting time of the vehicle after reaching the charging pile is reduced, and the charging efficiency is improved.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.

The following are device embodiments of the application, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.

Fig. 8 is a schematic structural diagram of a battery temperature control device according to an embodiment of the present application, and for convenience of explanation, only the portions related to the embodiment of the present application are shown, and the details are as follows:

as shown in fig. 8, the battery temperature control apparatus 800 may include an acquisition module 801, a target temperature determination module 802, a cooling power determination module 803, and a temperature control module 804.

The obtaining module 801 is configured to obtain, in response to a charging request, a first duration of time to reach a target charging pile, a first electric quantity required to be consumed to reach the target charging pile, and a current electric quantity of a battery, a current temperature of the battery, and a target electric quantity of the battery, where the target electric quantity of the battery is a target electric quantity of the battery when charging of the battery is completed. The target temperature determining module 802 is configured to determine a target battery temperature based on a target battery power, a current battery power, and a first battery power, where the target battery temperature is a target battery temperature when charging the battery is started. The cooling power determination module 803 is configured to determine a target cooling power for the battery based on the battery target temperature, the battery current temperature, and the first time period. The temperature control module 804 is configured to control the temperature of the battery based on the target cooling power.

In one possible implementation, the target temperature determining module 802 may be specifically configured to calculate a required charge power of the battery according to the target power of the battery, the current power of the battery, and the first power, determine a charge power to the battery according to the required charge power and a preset charge time, and determine the target temperature of the battery according to the charge power.

The process of determining the target temperature of the battery according to the charging power by the target temperature determining module 802 includes determining a power interval corresponding to the charging power, obtaining a charging temperature corresponding to the power interval, each power interval corresponding to a preset charging temperature, and determining the charging temperature corresponding to the power interval as the target temperature of the battery.

In one possible implementation, the cooling power determining module 803 may be specifically configured to determine a change value of the battery temperature according to the current temperature of the battery and the target temperature of the battery, calculate work required to be performed on the battery according to the weight of the battery cell, the specific heat capacity of the battery cell and the change value of the battery temperature, and determine the target cooling power according to the work required to be performed on the battery and the first duration.

In one possible implementation, the temperature control module 804 may be configured to determine a target flow rate and a target inlet temperature based on a target cooling power, the target flow rate being a flow rate of a liquid for cooling the battery, the target inlet temperature being a target temperature of the liquid before cooling the battery, and control the temperature of the battery by adjusting the target flow rate and the target inlet temperature.

The temperature control module 804 controls the temperature of the battery by adjusting the target flow rate and the target inlet temperature, and includes determining a water pump on duty cycle of the battery water pump according to the target flow rate, determining a compressor rotational speed according to a difference between the actual inlet temperature and the target inlet temperature, and a change rate of the actual inlet temperature, and controlling the temperature of the battery by adjusting the water pump on duty cycle and the compressor rotational speed. Wherein the actual inlet temperature is the actual temperature of the liquid before the battery is cooled.

For example, the temperature control module 804 may determine the water pump on duty cycle based on pwm=d×l _t +e, L _t is the target flow, and d and e are preset coefficients.

The process of determining the rotational speed of the compressor by the temperature control module 804 according to the difference between the actual inlet temperature and the target inlet temperature and the change rate of the actual inlet temperature includes determining a plurality of preset temperature spaces corresponding to the difference, each of the preset temperature spaces being different, determining a plurality of preset change rate spaces corresponding to the change rate, each of the preset change rate spaces being different, and adjusting the rotational speed of the compressor according to the preset temperature spaces corresponding to the difference and the preset change rate spaces corresponding to the change rate.

An embodiment of the present application provides a vehicle including an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement steps in any one of the embodiments of the battery temperature control method described above, such as steps 301 to 304 shown in fig. 3.

Embodiments of the present application also provide a computer program product having a program code which, when run in a corresponding processor, controller, computing device or terminal, performs the steps of any of the battery temperature control method embodiments described above, such as steps 301 to 304 shown in fig. 3.

Those skilled in the art will appreciate that the methods and apparatus presented in the embodiments of the present application may be implemented in various forms of hardware, software, firmware, special purpose processors, or a combination thereof. The special purpose processor may include an Application Specific Integrated Circuit (ASIC), a Reduced Instruction Set Computer (RISC), and/or a Field Programmable Gate Array (FPGA). The proposed method and device are preferably implemented as a combination of hardware and software. The software is preferably installed as an application program on a program storage device. Which is typically a machine based on a computer platform having hardware, such as one or more Central Processing Units (CPUs), random Access Memory (RAM), and one or more input/output (I/O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described herein may either be part of the application program or part of the application program which is executed by the operating system.

Fig. 9 is a schematic diagram of an electronic device according to an embodiment of the present application. As shown in fig. 9, the electronic device 900 of this embodiment comprises a processor 901, a memory 902 and a computer program 903 stored in said memory 902 and executable on said processor 901. The steps of the various embodiments of the tire monitoring method described above, such as steps 301 through 304 shown in fig. 3, are implemented when the processor 901 executes the computer program 903. Or the processor 901 may perform the functions of the modules/units in the above-described embodiments of the apparatus, such as the functions of the modules/units 801 to 804 shown in fig. 8, when executing the computer program 903.

Illustratively, the computer program 903 may be partitioned into one or more modules/units that are stored in the memory 902 and executed by the processor 901 to perform/implement the schemes provided by the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used to describe the execution of the computer program 903 in the electronic device 900. For example, the computer program 903 may be split into modules/units 801 to 804 shown in fig. 8.

The electronic device 900 may be a vehicle controller, a mobile phone, a notebook, a palm computer, a cloud server, and other computing devices. The electronic device 900 may include, but is not limited to, a processor 901, a memory 902. It will be appreciated by those skilled in the art that fig. 9 is merely an example of an electronic device 900 and is not intended to limit the electronic device 900, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the electronic device 900 may further include an input-output device, a network access device, a bus, etc.

The Processor 901 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 902 may be an internal storage unit of the electronic device 900, such as a hard disk or a memory of the electronic device 900. The memory 902 may also be an external storage device of the electronic device 900, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are provided on the electronic device 900. Further, the memory 902 may also include both internal storage units and external storage devices of the electronic device 900. The memory 902 is used to store the computer program as well as other programs and data required by the electronic device. The memory 902 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the method embodiments of vehicle air conditioning control when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.

Furthermore, the features of the embodiments shown in the drawings of the application or of the various embodiments mentioned in the description are not necessarily to be understood as separate embodiments from each other. Rather, each feature described in one example of one embodiment may be combined with one or more other desired features from other embodiments, resulting in other embodiments not described in text or with reference to the drawings.

The foregoing embodiments are merely illustrative of the technical solutions of the present application, and not restrictive, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery temperature control method, comprising:

In response to a charging request, obtaining a first time duration to reach a target charging pile, a first amount of electricity required to reach the target charging pile, a current battery electricity level, a current battery temperature, and a target battery electricity level; wherein the target battery electricity level is a target battery electricity level when battery charging is completed;

Determine a battery target temperature based on the battery target power, the battery current power and the first power; wherein the battery target temperature is a target temperature of the battery when charging of the battery begins;

determining a target cooling power for the battery based on the battery target temperature, the battery current temperature, and the first duration;

Based on the target cooling power, controlling the temperature of the battery;

Wherein, determining the battery target temperature based on the battery target power, the battery current power and the first power includes:

Calculating the required charging power of the battery according to the target power of the battery, the current power of the battery and the first power;

Determine the charging power of the battery according to the required charging power and the preset charging time; wherein the preset charging time is determined based on the charging model corresponding to the area where the target charging pile is located;

The battery target temperature is determined according to the charging power; wherein the battery charging power is negatively correlated with the battery target temperature.

2. The battery temperature control method according to claim 1, wherein determining the battery target temperature according to the charging power comprises:

Determining a power range corresponding to the charging power;

Acquire a charging temperature corresponding to the power interval, each of the power intervals corresponding to a preset charging temperature;

The charging temperature corresponding to the power interval is determined as the battery target temperature.

3. The battery temperature control method according to claim 1, characterized in that the determining the target cooling power for the battery based on the battery target temperature, the battery current temperature and the first duration comprises:

Determining a change value of the battery temperature according to the current battery temperature and the target battery temperature;

Calculating the work required for the battery based on the weight of the battery cell, the specific heat capacity of the battery cell and the change in the battery temperature;

The target cooling power is determined according to the work required to be done on the battery and the first duration.

4. The battery temperature control method according to claim 1, characterized in that the temperature control of the battery based on the target cooling power comprises:

Based on the target cooling power, determining a target flow rate and a target inlet temperature, wherein the target flow rate is the flow rate of the liquid used to cool the battery, and the target inlet temperature is the target temperature of the liquid before cooling the battery;

The battery is temperature controlled by adjusting the target flow rate and the target inlet temperature.

5. The battery temperature control method according to claim 4, characterized in that the temperature control of the battery by adjusting the target flow rate and the target inlet temperature comprises:

Determining a water pump on duty cycle according to the target flow rate;

Determining the compressor speed according to the difference between the actual inlet temperature and the target inlet temperature, and the rate of change of the actual inlet temperature; wherein the actual inlet temperature is the actual temperature of the liquid before cooling the battery;

The temperature of the battery is controlled by adjusting the water pump opening duty cycle and the compressor speed.

6. The battery temperature control method according to claim 5, characterized in that the step of determining the water pump start-up duty cycle according to the target flow rate comprises:

based on Determine the water pump opening duty cycle, The duty cycle of the water pump is is the target flow, and is the preset coefficient.

7. The battery temperature control method according to claim 5, characterized in that the step of determining the compressor speed according to the difference between the actual inlet temperature and the target inlet temperature and the rate of change of the actual inlet temperature comprises:

Determine a preset temperature space corresponding to the difference, wherein the number of the preset temperature spaces is multiple, and each preset temperature space is different;

Determine a preset change rate space corresponding to the change rate, wherein the number of the preset change rate spaces is multiple, and each preset change rate space is different;

The rotation speed of the compressor is adjusted according to the preset temperature space corresponding to the difference and the preset change rate space corresponding to the change rate.

8. The battery temperature control method according to claim 7, characterized in that the adjusting the speed of the compressor according to the preset temperature space corresponding to the difference and the preset change rate space corresponding to the change rate comprises:

When the difference is greater than or equal to the first preset temperature, if the change rate is less than or equal to the first preset change rate, the speed of the compressor is increased. The corresponding speed, △T2 is the rate of change, is a preset coefficient; if the change rate is greater than or equal to the second preset change rate, the speed of the compressor is reduced The corresponding speed; if the change rate is greater than the first preset change rate and less than the second preset change rate, the speed of the compressor is not adjusted; wherein the second preset change rate is greater than the first preset change rate;

When the difference is in the first temperature interval, if the change rate is less than or equal to the first preset change rate, the speed of the compressor is increased by the first preset number of revolutions; if the change rate is greater than or equal to the first preset change rate, the speed of the compressor is decreased by the first preset number of revolutions; if the change rate is greater than the first preset change rate and less than the second preset change rate, the speed of the compressor is not adjusted; wherein the maximum value of the first temperature interval is the first preset temperature;

When the difference is in the second temperature range, if the change rate is less than or equal to the first preset change rate, the speed of the compressor is increased by the second preset speed; if the change rate is greater than or equal to the second preset change rate, the speed of the compressor is reduced by the second preset speed; if the change rate is greater than the first preset change rate and less than the second preset change rate, the speed of the compressor is not adjusted; wherein the second preset speed is less than the first preset speed, the maximum value of the second temperature range is less than or equal to the minimum value of the first temperature range, and the minimum value of the second temperature range is greater than 0°C.

9. The battery temperature control method according to claim 8, characterized in that the speed of the compressor is adjusted according to the preset temperature space corresponding to the difference and the preset change rate space corresponding to the change rate, and further comprises:

When the difference is in the third temperature interval, if the change rate is less than or equal to the third preset change rate, the speed of the compressor is increased by the third preset number of revolutions; if the change rate is greater than or equal to the first preset change rate, the speed of the compressor is decreased by the fourth preset number of revolutions; if the change rate is greater than the third preset change rate and less than the first preset change rate, the speed of the compressor is not adjusted; wherein the maximum value of the third temperature interval is less than or equal to the minimum value of the second temperature interval, and the minimum value of the third temperature interval is greater than 0°C;

If the difference is in the fourth temperature interval, the speed of the compressor is not adjusted; wherein the maximum value of the fourth temperature interval is less than or equal to the minimum value of the third temperature interval, and the minimum value of the fourth temperature interval is less than 0°C;

When the difference is less than or equal to the second preset temperature, if the change rate is less than or equal to the third preset change rate, the speed of the compressor is reduced by the fifth preset speed; if the change rate is greater than or equal to the first preset change rate, the speed of the compressor is reduced by the sixth preset speed; if the change rate is greater than the third preset change rate and less than the first preset change rate, the speed of the compressor is reduced by the seventh preset speed; wherein the second preset temperature is less than the minimum value of the fourth temperature range, the sixth preset speed is greater than the seventh preset speed, and the seventh preset speed is greater than the fifth preset speed.

10. A battery temperature control device, comprising:

an acquisition module, configured to acquire, in response to a charging request, a first time duration to reach a target charging pile, a first amount of electricity required to reach the target charging pile, a current battery electricity level, a current battery temperature, and a target battery electricity level; wherein the target battery electricity level is a target battery electricity level when battery charging is completed;

a target temperature determination module, configured to determine a battery target temperature based on the battery target power, the battery current power and the first power; wherein the battery target temperature is a target temperature of the battery when charging of the battery begins;

a cooling power determination module, configured to determine a target cooling power for the battery based on the battery target temperature, the battery current temperature and the first duration;

a temperature control module, configured to perform temperature control on the battery based on the target cooling power;

The target temperature determination module is specifically used to: calculate the required charging power of the battery according to the battery target power, the current power of the battery and the first power; determine the charging power of the battery according to the required charging power and the preset charging time; determine the battery target temperature according to the charging power; wherein the preset charging time is determined based on the charging model corresponding to the area where the target charging pile is located, and the battery charging power is negatively correlated with the battery target temperature.

11. A vehicle, comprising an electronic device, wherein the electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the battery temperature control method as described in any one of claims 1 to 9 when executing the computer program.