Battery temperature control method, device and vehicle

Abstract

The present application relates to the technical field of new energy vehicles, and provides a battery temperature control method, device and vehicle. The battery temperature control method includes: in response to a charging request, obtaining a first duration to reach a target charging pile, a first amount of electricity required to reach the target charging pile, and the current battery electricity, the current battery temperature and the target battery electricity; determining the battery target temperature based on the battery target electricity, the current battery electricity and the first electricity; determining the target cooling power for the battery based on the battery target temperature, the current battery temperature and the first duration; and controlling the battery temperature based on the target cooling power. The embodiment of the present application cools down the battery temperature in advance, so that the battery temperature can reach a temperature suitable for charging as soon as possible, so as to reduce the waiting time after the vehicle reaches the charging pile and improve the charging efficiency.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a battery temperature control method, device and vehicle. Background Art

[0002] As pure electric vehicles become more and more popular in the Chinese market, the charging time of electric vehicles has become the focus of users. Reducing the fast charging time of electric vehicles can not only alleviate users' charging anxiety, but also reduce mileage anxiety, making electric vehicles achieve the same driving experience as fuel vehicles. At present, when electric vehicles need fast charging, especially in high-temperature areas, the initial temperature of the battery pack of the electric vehicle is high, and the charging power is limited. It is necessary to wait for the air conditioning system to cool the battery pack to a suitable charging temperature before charging can begin. This undoubtedly wastes some time, resulting in longer charging time and affecting user experience. Summary of the invention

[0003] The present application provides a battery temperature control method, device and vehicle, which can cool down the battery of the vehicle in advance so that the battery temperature can reach a temperature suitable for charging as soon as possible, thereby reducing the waiting time after the vehicle reaches the charging pile and improving the charging efficiency.

[0004] In a first aspect, the present application provides 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 power required to reach the target charging pile, and a current battery power, a current battery temperature, and a target battery power; wherein the battery target power is the target power of the battery when battery charging is completed; based on the battery target power, the current battery power, and the first power, determining a battery target temperature; wherein the battery target temperature is the target temperature of the battery when charging of the battery starts; based on the battery target temperature, the current battery temperature, and the first time duration, determining a target cooling power for the battery; and based on the target cooling power, performing temperature control on the battery.

[0005] In the embodiment of the present application, after obtaining the first duration, the first power, the current power of the battery, the current temperature of the battery and the target power of the battery, the target temperature of the battery is determined based on the target power of the battery, the current power of the battery and the first power. Afterwards, the target cooling power for the battery is determined based on the target temperature of the battery, the current temperature of the battery and the first duration, and the temperature of the battery is controlled based on the target cooling power. It can be seen that the above-mentioned battery temperature control method can cool down the battery temperature in advance before the vehicle reaches the target charging pile, so that the battery temperature can reach a temperature suitable for charging as soon as possible, thereby reducing the waiting time after the vehicle reaches the charging pile and improving the charging efficiency.

[0006] In one possible implementation, the above-mentioned determination of 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 battery target power, the battery current power and the first power; determining the charging power of the battery according to the required charging power and the preset charging time; and determining the above-mentioned battery target temperature according to the charging power.

[0007] In a possible implementation, determining the battery target temperature based on the charging power includes: determining a power range corresponding to the charging power; obtaining the charging temperature corresponding to the power range, each power range corresponding to a preset charging temperature; and determining the charging temperature corresponding to the power range as the battery target temperature.

[0008] In one possible implementation, the target cooling power for the battery is determined based on the battery target temperature, the battery current temperature and the first duration, including: determining the change in battery temperature based on the battery current temperature and the battery target 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 battery temperature; determining the target cooling power based on the work required for the battery and the first duration.

[0009] In one possible implementation, the above-mentioned temperature control of the battery based on the target cooling power includes: determining a target flow rate and a target inlet temperature based on the target cooling power, the target flow rate being the flow rate of the liquid used to cool the battery, and the target inlet temperature being the target temperature of the liquid before cooling the battery; and controlling the temperature of the battery by adjusting the target flow rate and the target inlet temperature.

[0010] In one possible implementation, the temperature of the battery is controlled by adjusting the target flow rate and the target inlet temperature, including: determining the water pump startup 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; and the battery temperature is controlled by adjusting the water pump startup duty cycle and the compressor speed.

[0011] For example, it can be based on K=d*L t +e determines the duty cycle of the water pump, K is the duty cycle of the water pump, L t is the target flow rate, d and e are the preset coefficients.

[0012] In a possible implementation, the compressor speed is determined based on the difference between the actual inlet temperature and the target inlet temperature, and the rate of change of the actual inlet temperature, including: determining a preset temperature space corresponding to the difference, the number of the preset temperature spaces is multiple, and each preset temperature space is different; determining a preset change rate space corresponding to the change rate, the number of the preset change rate spaces is multiple, and each preset change rate space is different; adjusting the compressor speed according to the preset temperature space corresponding to the difference and the preset change rate space corresponding to the change rate.

[0013] In one scenario, when the above-mentioned 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 by the speed corresponding to △T2*f, △T2 is the change rate, and f is the preset coefficient; if the change rate is greater than or equal to the second preset change rate, the speed of the compressor is decreased by the speed corresponding to △T2*f; 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.

[0014] In another scenario, when the above-mentioned difference is in the first 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 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 reduced 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 range is the first preset temperature.

[0015] In another scenario, when the above 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. 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.

[0016] In another scenario, 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. 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.

[0017] In another scenario, if the difference is in a 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.

[0018] In another scenario, 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 adjusted down 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 adjusted down 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 adjusted down by the seventh preset speed. 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.

[0019] In a second aspect, the present application provides a battery temperature control device, including: an acquisition module, used to respond to a charging request, obtain a first time to reach a target charging pile, a first amount of electricity required to reach the target charging pile, and a current battery charge, a current battery temperature and a target battery charge; wherein the battery target charge is the target battery charge at the end of battery charging; a target temperature determination module, used to determine the battery target temperature based on the above-mentioned battery target charge, the current battery charge and the first charge; wherein the battery target temperature is the target temperature of the battery when charging starts; a cooling power determination module, used to determine the target cooling power for the battery based on the above-mentioned battery target temperature, the current battery temperature and the first time; a temperature control module, used to control the temperature of the battery based on the target cooling power.

[0020] 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, wherein when the processor executes the computer program, the processor implements the steps of the method described in the first aspect or any possible implementation of the first aspect.

[0021] In a fourth aspect, an embodiment of the present application provides a vehicle, which includes an electronic device, wherein the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0022] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0023] In a sixth aspect, an embodiment of the present application provides a computer program product, which has a program code. When the program code runs in a corresponding processor, controller, computing device or electronic device, the steps of the method described in the first aspect or any possible implementation of the first aspect are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of an application scenario of the battery temperature control method provided in an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the architecture involved in the battery temperature control method provided in an embodiment of the present application;

[0027] Figure 3 is a flow chart of a battery temperature control method provided in an embodiment of the present application;

[0028] Figure 4 is a flow chart of the battery temperature control method provided in the embodiment of the present application;

[0029] Figure 5 A battery cooling circuit is provided in an embodiment of the present application;

[0030] Figure 6 It is another battery cooling circuit provided in an embodiment of the present application;

[0031] Figure 7 It is another battery cooling circuit provided in an embodiment of the present application;

[0032] Figure 8 is a schematic diagram of the structure of a battery temperature control device provided in an embodiment of the present application;

[0033] Fig. 9 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0036] Figure 1 The application scenario of the battery temperature control method provided by the embodiment of the present application is shown. Figure 1 , the application scenario may include a vehicle 10 and a charging pile 20. When the user drives the vehicle 10, the power of the battery of the vehicle 10 will decrease and the temperature will increase. When the battery power drops to a threshold, it means that the battery power is low and the battery needs to be charged. At this time, the vehicle 10 will remind the user to charge the battery, for example, the intelligent temperature control charging mode of the vehicle 10 is turned on to remind the user to charge the battery.

[0037] After turning on the intelligent temperature control charging mode, the vehicle 10 can actively search for charging piles near the vehicle and display the searched charging piles to the user. After the user selects the target charging pile 20, the vehicle 10 generates a navigation path from the current location of the vehicle to the target charging pile 20. At this time, the battery pack temperature is not the most suitable charging temperature. In order to reduce the waiting time before charging, the vehicle 10 can use the above-mentioned battery temperature control method to cool the battery on the way to the target charging pile 20. When the vehicle 10 arrives at the target charging pile 20, the battery temperature drops to a temperature suitable for charging, and the battery can be charged immediately, reducing the waiting time before charging, thereby reducing the user's charging waiting time. It has been verified by experiments that when the vehicle 10 arrives at the target charging pile 20, the temperature of the battery is a suitable charging temperature, which can save about a quarter of the charging waiting time.

[0038] Figure 2 The schematic diagram of the architecture of the battery temperature control method provided in the embodiment of the present application is shown. The process of cooling the battery by the battery temperature control method of the vehicle 10 can be based on Figure 2 The architecture shown enables cooling of the battery.

[0039] See also Figure 2The 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, and a three-way valve 106. The three-way proportional valve 103 may be a gradually adjustable valve body that can realize functions such as three-way opening and two-way opening. The above architecture constitutes a cooling circuit for the battery.

[0040] Specifically, the battery cooler 101 is connected to the battery 200 to cool the battery 200, and the battery cooler 101 is also connected to 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 connected to the condenser 104, and the condenser 104 is connected to the second port 2 of the three-way 106 through the one-way valve 105. The third port 3 of the three-way 106 is connected to the battery cooler 101 through the electronic expansion valve 107. The third valve port 3 of the three-way proportional valve 103 is connected to the first inlet of the water-cooled condenser 108, and the first outlet of the water-cooled condenser 108 is connected to the first port 1 of the three-way 106. The second outlet of the water-cooled condenser 108 is connected to the inlet of the low-temperature radiator 110 through the electronic water pump 109, and the outlet of the low-temperature radiator 110 is connected to the second inlet of the water-cooled condenser 108. The electronic fan 111 is arranged corresponding to the condenser 104.

[0041] About how to pass Figure 2 The architecture shown is used to cool the battery. Please refer to the subsequent content and will not be repeated here.

[0042] The following combination Figure 1 and Figure 2 , the battery temperature control method provided in the embodiments of the present application is described in detail.

[0043] See also Figure 3 , which shows a flow chart of the battery temperature control method provided in an embodiment of the present application, which is described in detail as follows:

[0044] Step 301, in response to a charging request, obtain a first time duration to reach a target charging pile, a first amount of power required to reach the target charging pile, and a current battery power, a current battery temperature, and a target battery power.

[0045] Exemplarily, the charging request may be generated when the battery level of the vehicle is less than a threshold. For example, the charging request may specifically be: when the battery SOC (State of Charge) is less than a threshold, the vehicle VCU (Vehicle Control Unit) actively generates a charging request. For another example, the charging request may specifically be: when the battery SOC is less than a threshold, the vehicle VCU responds to a battery charging instruction input by a user.

[0046] In one scenario, the vehicle's BMS (Battery Management System) can detect the battery SOC in real time. When the battery SOC is less than a threshold, it sends information that the battery SOC is lower than the threshold to the vehicle VCU. The vehicle VCU can control the intelligent temperature control charging mode to start based on the information to remind the user to charge the battery. At this time, the user can manually input or voice input the battery charging instruction, and the VCU responds to the battery charging instruction to prepare for battery charging.

[0047] The first duration is the time required for the vehicle to travel from the current position to the target charging pile.

[0048] For example, the VCU responds to the charging request, turns on the in-vehicle navigation and searches for charging piles near the vehicle's location, and displays the searched charging piles on the vehicle's central control screen for the user to select the target charging pile. After the user determines the target charging pile, the VCU determines the time t1 when the vehicle arrives at the target charging pile based on the location of the target charging pile, the vehicle's current location and speed. The VCU can also obtain the time t2 when the vehicle arrives at the target charging pile provided by the in-vehicle navigation, and then determine the above-mentioned first duration t based on the minimum value of time t1 and time t2. Considering that if the first duration t is determined according to the maximum value of time t1 and time t2, it is very likely that the actual time when the vehicle arrives at the target charging pile is faster than the maximum value, resulting in the battery still not reaching the most suitable temperature.

[0049] The first amount of electricity is the amount of electricity required for the vehicle to travel from the current position to the target charging station.

[0050] For example, the VCU can calculate the distance L from the vehicle to the target charging pile according to the location of the target charging pile and the current location of the vehicle, and then calculate the first power S according to the product of the unit distance power consumption data n and the distance L. L =L*n.

[0051] It should be noted that, in the first power S L When the current battery charge S is greater than or equal to the current battery charge S, the intelligent temperature control charging mode can be turned off to support the vehicle to reach the target charging pile as much as possible, avoiding the unnecessary power consumption of the air conditioning system that makes it difficult for the vehicle to reach the target charging pile smoothly. L When it is greater than or equal to the current battery power S, it detects whether there is a charging pile closer. If there is a charging pile closer, the user can be reminded to change the target charging pile.

[0052] See also Figure 4, the current battery power and the current battery temperature can be collected by BMS. For example, after receiving the charging request, VCU requests BMS to obtain the current battery power and the current battery temperature. BMS responds to VCU's request and sends the battery power and temperature to VCU. Among them, the current battery temperature can be determined based on the battery temperature data of a preset time period. For example, the moment when BMS receives the request from VCU is the first moment, and BMS can use the average value of the battery temperature data of the preset time period before the first moment as the current battery temperature.

[0053] In this step, the battery target power is the target power of the battery when the battery charging is completed. It can be the power preset when the vehicle leaves the factory (for example, 80%), or it can be the power set by the user (for example, 90%), and there is no limitation on this.

[0054] Step 302 : determining a target battery temperature based on the target battery power, the current battery power and the first battery power.

[0055] The battery target temperature may be the target temperature of the battery when charging the battery begins. Different charging powers of the battery correspond to different battery target temperatures. The higher the charging power of the battery, the lower the corresponding battery target temperature. The specific value of the battery target temperature may refer to the contents of Table 1 below.

[0056] In some embodiments, step 302 may include: calculating the required charging power of the battery based on the battery target power, the current power of the battery and the first power; determining the charging power of the battery based on the required charging power and the preset charging time; and determining the battery target temperature based on the charging power.

[0057] For example, the battery's required charging capacity △S = S t -(SS L ), (SS L ) part is the current battery power S, the first power S L Under the condition of t Subtract (SS L ) part is the required charging capacity △S of the battery.

[0058] After obtaining the required charging power △S of the battery, the charging power P for the battery can be determined based on the relationship between energy and power = △S / t c Among them, t c The preset charging time mentioned above may be the charging time preset when the vehicle leaves the factory (for example, 0.5 hours), or the charging time set by the user in the charging management mode (for example, 0.5 hours), and is not limited to this.

[0059] Exemplarily, the preset charging time may be multiple, corresponding to charging modes such as fast charging and slow charging. For example, a corresponding charging model may be determined based on the area where the target charging pile is located, and a corresponding preset charging time may be obtained to improve the intelligence of battery charging, thereby improving user experience.

[0060] For example, if the target charging pile is located in the first type of area, such as near the user's residence, a slow charging mode can be used to obtain a relatively long preset charging time. If the target charging pile is located in the second type of area, such as near a shopping mall, a fast charging mode can be used to obtain a relatively short preset charging time.

[0061] In addition, when the target charging pile is located in the first type of area, a fast charging mode can also be used to obtain a relatively short preset charging time.

[0062] After the charging power P of the battery is obtained, the battery target temperature T corresponding to the charging power P can be determined by using a pre-calibrated relationship between the charging power and the battery temperature.

[0063] Specifically, determining the battery target temperature based on the charging power may include: determining a power interval corresponding to the charging power; obtaining the 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 battery target temperature.

[0064] As shown in Table 1, in the pre-calibrated relationship between charging power and battery temperature, the charging power can correspond to four power ranges, namely 300KW≥P≥200KW, 200KW>P≥150KW, 150KW>P≥100KW and 100KW>P. Each power range corresponds to a battery temperature, namely T b1 =25℃、T b2 =28℃、T b3 =31℃ and T b4 = 35°C. The classification of charging power in Table 1 covers the range of power consumption from 5% to 80%, and the charging time is 15 minutes to 30 minutes. In addition, the higher the battery target temperature, the lower the corresponding air conditioning system energy consumption.

[0065] Table 1 Relationship between charging power and battery target temperature

[0066] Charging power Battery target temperature 300KW≥P≥200KW <![CDATA[T b1 =25℃]]> 200KW>P≥150KW <![CDATA[T b2 =28℃]]> 150KW>P≥100KW <![CDATA[T b3 =31℃]]> 100KW>P <![CDATA[T b4 =35℃]]>

[0067] It should be noted that the data in Table 1 are only exemplary, and the embodiments of the present application do not specifically limit the data in Table 1. The greater the charging power, the lower the corresponding battery target temperature. Those skilled in the art can adjust the data in Table 1 according to this idea and actual needs to apply it to the product, which is within the scope of protection of the claims of the present application.

[0068] Step 303 : determining a target cooling power for the battery based on the target battery temperature, the current battery temperature and the first duration.

[0069] In some embodiments, step 303 may include: determining the change value of the battery temperature based on the current temperature of the battery and the target temperature of the battery; 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 value of the battery temperature; and determining the target cooling power based on the above work required for the battery and the first duration.

[0070] Among them, the difference between the current battery temperature T1 and the target battery temperature T can be calculated to determine the change in battery temperature as T1-T. The work required for the battery can be calculated by the weight of the battery cell, the specific heat capacity of the battery cell, and the change in battery temperature. Specifically, the work required for the battery is equal to (T1-T)*m*c, where c is the specific heat capacity of the battery cell, m is the equivalent weight of the battery, and m=m 电芯 *a / b, a is the number of batteries in the battery pack, m 电芯 is the weight of the battery cell, and b is the proportion of the battery cell weight in the battery weight. After obtaining the work required for the battery (T1-T)*m*c, the work required for the battery is divided by the first time t to obtain the target cooling power, that is, the target cooling power

[0071] 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 can be 0.95, and c can be determined based on data provided by the battery manufacturer.

[0072] Step 304 : Control the temperature of the battery based on the target cooling power.

[0073] After determining the target cooling power, Figure 2 The architecture shown controls the battery temperature so that the battery temperature is cooled to the battery target temperature when the vehicle arrives at the target charging station.

[0074] In some embodiments, step 304 may include: determining a target flow rate and a target inlet temperature based on a target cooling power, 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; and controlling the temperature of the battery by adjusting the target flow rate and the target inlet temperature.

[0075] After the target cooling power is obtained, the target flow rate and the target inlet temperature corresponding to the target cooling power can be determined by using the pre-calibrated relationship among the target cooling power, the target flow rate and the target inlet temperature.

[0076] See Table 2, the pre-calibrated target cooling power P c , the relationship between the target flow rate and the target inlet temperature, the target cooling power P c It can correspond to four cooling power ranges, namely P c ≥9KW、9KW>P c ≥7KW、7KW>P c ≥5KW and 5KW>P c ≥3KW. Each cooling power range corresponds to a target flow rate, which is L t =MAX, L t =20l / min, L t =17l / min and L t =15l / min, and a corresponding target inlet water temperature, respectively T w1 =10℃、T w1 =13℃、T w1 =15℃ and T w1 =20℃.

[0077] Table 2 Relationship between target flow rate and target inlet temperature

[0078] <![CDATA[Target cooling power P c > Target traffic Target inlet water temperature <![CDATA[P c ≥9KW]]> <![CDATA[L t =MAX]]> <![CDATA[T w1 =10℃]]> <![CDATA[9KW>P c ≥7KW]]> <![CDATA[L t =20l / min]]> <![CDATA[T w1 =13℃]]> <![CDATA[7KW>P c ≥5KW]]> <![CDATA[L t =17l / min]]> <![CDATA[T w1 =15℃]]> <![CDATA[5KW>P c ≥3KW]]> <![CDATA[L t =15l / min]]> <![CDATA[T w1 =20℃]]>

[0079] It should be noted that the data in Table 2 are only exemplary, and the embodiments of the present application do not impose specific restrictions on the data in Table 2. The larger the target cooling power, the larger the corresponding target flow rate, and the lower the corresponding target inlet temperature. Those skilled in the art can adjust the data in Table 2 according to this idea and actual needs to apply it to the product, which is within the scope of protection of the claims of the present application.

[0080] Exemplarily, the temperature control of the battery by adjusting the target flow rate and the target inlet temperature may include: determining the water pump opening 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; and controlling the temperature of the battery by adjusting the water pump opening duty cycle and the compressor speed. The actual inlet temperature is the actual temperature of the liquid before cooling the battery.

[0081] After the target flow rate is obtained, the water pump on duty cycle corresponding to the target flow rate can be determined through the pre-calibrated relationship between the target flow rate and the water pump on duty cycle.

[0082] See Table 3, in the relationship between the pre-calibrated target flow rate and the pump opening duty cycle, the target flow rate L t It can correspond to four flow intervals, namely L t =MAX, L t =20l / min, L t =17l / min and L t =15l / min. Each flow interval corresponds to a water pump on duty cycle, which are K=85%, K=70%, K=65% and K=55%. The water pump on duty cycle can be based on K=(d*L t +e)*100% confirmed, where L t is the target flow rate, d and e are preset coefficients. For example, the value of d can be 0.028, and the value of e can be 0.15.

[0083] Table 3 Relationship between target flow and pump opening duty cycle

[0084] Target traffic Water pump on duty cycle <![CDATA[L t =MAX]]> K＝85％ <![CDATA[L t =20l / min]]> K＝70％ <![CDATA[L t =17l / min]]> K＝65％ <![CDATA[L t =15l / min]]> K＝55％

[0085] It should be noted that the data in Table 3 are only exemplary, and the embodiments of the present application do not specifically limit the data in Table 3. The larger the target flow rate, the larger the corresponding water pump opening duty cycle. Those skilled in the art can adjust the data in Table 3 according to this idea and actual needs to apply it to the product, which is within the scope of protection of the claims of the present application.

[0086] After obtaining the difference between the actual inlet temperature and the target inlet temperature, and the rate of change of the actual inlet temperature, the compressor speed may be determined by the relationship between the pre-calibrated difference, the rate of change and the compressor speed.

[0087] Specifically, the preset temperature space corresponding to the difference can be determined, and the number of the preset temperature spaces is multiple and each preset temperature space is different; the preset change rate space corresponding to the change rate is determined, and the number of the preset change rate spaces is multiple and each preset change rate space is different; according to the preset temperature space corresponding to the above difference and the preset change rate space corresponding to the above change rate, the speed of the compressor is adjusted.

[0088] In one scenario, when the above-mentioned 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 by the speed corresponding to △T2*f, △T2 is the change rate, and f is the preset coefficient; if the change rate is greater than or equal to the second preset change rate, the speed of the compressor is decreased by the speed corresponding to △T2*f; 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.

[0089] Exemplarily, the first preset temperature can be 15°C, f can be 55, the first preset change rate can be 3°C every 5 seconds (i.e., a change of 3°C in 5 seconds), and the first preset change rate can be 6°C every 5 seconds (i.e., a change of 6°C in 5 seconds).

[0090] In another scenario, when the above-mentioned difference is in the first 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 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 reduced 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 range is the first preset temperature.

[0091] Exemplarily, the first temperature range may be 10° C. to 15° C., and the first preset number of revolutions may be 400 revolutions.

[0092] In another scenario, when the above 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. 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.

[0093] Exemplarily, the second temperature range may be 5° C. to 10° C., and the second preset number of revolutions may be 250 revolutions.

[0094] In another scenario, 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. 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.

[0095] Exemplarily, the second temperature interval may be 1°C to 5°C, the third preset change rate may be 1.5°C every 5 seconds (ie, 1.5°C changes in 5 seconds), the third preset number of revolutions may be 110 revolutions, and the third preset number of revolutions may be 100 revolutions.

[0096] In another scenario, if the difference is in a 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.

[0097] Illustratively, the fourth temperature interval may be -1°C to 1°C.

[0098] In another scenario, 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 adjusted down 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 adjusted down 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 adjusted down by the seventh preset speed. 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.

[0099] Exemplarily, the second preset temperature may be -1°C, the fifth preset number of revolutions may be 150 revolutions, the sixth preset number of revolutions may be 400 revolutions, and the seventh preset number of revolutions may be 250 revolutions.

[0100] Referring to Table 4, the relationship between the pre-calibrated difference ΔT1, the change rate ΔT2 and the compressor speed can be divided into a rapid cooling stage and a heat preservation stage for the battery. For example, the case where ΔT1 is greater than or equal to 5°C can be defined as a rapid cooling stage, and the case where ΔT1 is less than 5°C can be defined as a heat preservation stage.

[0101] Table 4 Compressor speed adjustment table

[0102]

[0103] 1. Rapid cooling stage

[0104] The rapid cooling stage is divided into three intervals according to the difference ΔT1, and the difference ΔT1 corresponding to the three intervals are: the difference ΔT1 is greater than or equal to 15°C, the difference ΔT1 is in the range of 10°C to 15°C, and the difference ΔT1 is in the range of 5°C to 10°C. For each interval, the interval is divided into three sub-intervals according to the change rate ΔT2, and the change rates ΔT2 corresponding to the three sub-intervals are: the change rate ΔT2 is less than or equal to 3°C per 5 seconds, the change rate ΔT2 is greater than or equal to 6°C per second, and the change rate ΔT2 is greater than 3°C per 5 seconds and less than 6°C per 5 seconds.

[0105] The following explains how to adjust the compressor speed during the rapid cooling stage.

[0106] When the difference ΔT1 is greater than or equal to 15°C, if the change rate ΔT2 is less than or equal to 3°C per second, the speed of the compressor is increased by the speed corresponding to ΔT2*55; if the change rate ΔT2 is greater than or equal to 6°C per second, the speed of the compressor is decreased by the speed corresponding to ΔT2*55; if the change rate ΔT2 is greater than 3°C per second and less than 6°C per second, the speed of the compressor is not adjusted.

[0107] When the difference ΔT1 is in the range of 10℃~15℃, if the change rate ΔT2 is less than or equal to 3℃ per 5 seconds, the compressor speed is increased by 400 rpm; if the change rate ΔT2 is greater than or equal to 6℃ per 5 seconds, the compressor speed is reduced by 400 rpm; if the change rate ΔT2 is greater than 3℃ per 5 seconds and less than 6℃ per 5 seconds, the compressor speed is not adjusted.

[0108] When the difference ΔT1 is in the range of 5℃~10℃, if the change rate ΔT2 is less than or equal to 3℃ per 5 seconds, the compressor speed will be increased by 250 rpm; if the change rate ΔT2 is greater than or equal to 6℃ per 5 seconds, the compressor speed will be reduced by 250 rpm; if the change rate ΔT2 is greater than 3℃ per 5 seconds and less than 6℃ per 5 seconds, the compressor speed will not be adjusted.

[0109] 2. Insulation stage

[0110] The insulation stage is divided into three intervals according to the difference ΔT1, and the difference ΔT1 corresponding to the three intervals are: the difference ΔT1 is in the range of 1℃~5℃, the difference ΔT1 is in the range of -1℃~1℃, and the difference ΔT1 is less than or equal to -1℃. For each interval, the interval is divided into three sub-intervals according to the change rate ΔT2, and the change rates ΔT2 corresponding to the three sub-intervals are: the change rate ΔT2 is less than or equal to 1.5℃ per 5 seconds, the change rate ΔT2 is greater than or equal to 3℃ per 5 seconds, and the change rate ΔT2 is greater than 1.5℃ per 5 seconds and less than 3℃ per 5 seconds.

[0111] The following explains how to adjust the compressor speed during the insulation stage.

[0112] When the difference ΔT1 is in the range of 1℃~5℃, if the change rate ΔT2 is less than or equal to 1.5℃ per 5 seconds, the compressor speed is increased by 110 rpm; if the change rate ΔT2 is greater than or equal to 3℃ per 5 seconds, the compressor speed is reduced by 100 rpm; if the change rate ΔT2 is greater than 1.5℃ per 5 seconds and less than 3℃ per 5 seconds, the compressor speed is not adjusted.

[0113] If the difference ΔT1 is within the range of -1°C to 1°C, the speed of the compressor is not adjusted.

[0114] When the difference ΔT1 is less than or equal to -1°C, if the change rate ΔT2 is less than or equal to 1.5°C per 5 seconds, the compressor speed will be reduced by 150 rpm; if the change rate ΔT2 is greater than or equal to 3°C per 5 seconds, the compressor speed will be reduced by 400 rpm; if the change rate ΔT2 is greater than 1.5°C per 5 seconds and less than 3°C per 5 seconds, the compressor speed will be reduced by 250 rpm.

[0115] It should be noted that the data in Table 4 are only for illustrative purposes, and the embodiments of the present application do not impose specific restrictions on the data in Table 4. The change rate interval corresponding to the rapid cooling stage is greater than the change rate interval corresponding to the heat preservation stage, because the battery temperature in the heat preservation stage is closer to the battery target temperature, and the battery temperature needs to be finely controlled. Those skilled in the art can adjust the data in Table 4 based on this idea and actual needs for application in products, which is within the scope of protection of the claims of this application.

[0116] In addition, the temperature control of the battery in step 304 may also include the control of the electronic expansion valve and the electronic fan. The control strategy of the electronic expansion valve and the electronic fan is similar to the traditional charging strategy, and is controlled by monitoring the overheat of the battery cooler outlet and the high and low pressures of the air conditioner, which will not be described here.

[0117] The following combination Figures 5 to 7 The three battery cooling circuits are described.

[0118] See also Figure 5 The battery cooling circuit 1 is: electric compressor 102 → three-way proportional valve 103 → condenser 104 → one-way valve 105 → three-way valve 106 → electronic expansion valve 107 → battery cooler 101 → electric compressor 102.

[0119] See also Figure 6 The second battery cooling circuit is: battery cooler 101 → electric compressor 102 → three-way proportional valve 103 → water-cooled condenser 108 → three-way valve 106 → electronic expansion valve 107 → battery cooler 101.

[0120] See also Figure 7 The battery cooling circuit three is: battery cooler 101 → electric compressor 102 → three-way proportional valve 103 → water-cooled condenser 108 → electronic water pump 109 → low-temperature radiator 110 → water-cooled condenser 108 → three-way 106 → electronic expansion valve 107 → battery cooler 101.

[0121] Based on the above determined water pump compression ratio, compressor speed, and control strategy for the electronic expansion valve and the electronic fan, the above three battery cooling circuits can be used to cool the battery. The above three battery cooling circuits can be used alone to cool the battery, or used together to cool the battery, which is not limited in the embodiments of the present application.

[0122] The above-mentioned battery temperature control method, after obtaining the first duration, the first power, the current power of the battery, the current temperature of the battery and the target power of the battery, determines the target temperature of the battery based on the target power of the battery, the current power of the battery and the first power. Afterwards, the target cooling power for the battery is determined based on the target temperature of the battery, the current temperature of the battery and the first duration, and the temperature of the battery is controlled based on the target cooling power. It can be seen that the above-mentioned battery temperature control method can cool down the battery temperature in advance before the vehicle reaches the target charging pile, so that the battery temperature can reach a temperature suitable for charging as soon as possible, thereby reducing the waiting time after the vehicle reaches the charging pile and improving the charging efficiency.

[0123] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0124] The following is an embodiment of the device of the present application. For details not described in detail, please refer to the corresponding method embodiment described above.

[0125] Figure 8 The structure diagram of the battery temperature control device provided in the embodiment of the present application is shown. For the convenience of explanation, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0126] like Figure 8 As shown, the battery temperature control device 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 .

[0127] The acquisition module 801 is used to respond to the charging request and obtain the first time duration to reach the target charging pile, the first amount of electricity required to reach the target charging pile, the current battery power, the current battery temperature and the target battery power; wherein the target battery power is the target battery power at the end of battery charging. The target temperature determination module 802 is used to determine the target battery temperature based on the target battery power, the current battery power and the first power; wherein the target battery temperature is the target temperature of the battery when charging of the battery begins. The cooling power determination module 803 is used to determine the target cooling power for the battery based on the target battery temperature, the current battery temperature and the first time duration. The temperature control module 804 is used to control the temperature of the battery based on the target cooling power.

[0128] In one possible implementation, the target temperature determination module 802 can be specifically used to: calculate the required charging power of the battery based on the battery target power, the current power of the battery and the first power; determine the charging power of the battery based on the required charging power and the preset charging time; and determine the battery target temperature based on the charging power.

[0129] Exemplarily, the process of the target temperature determination module 802 determining the battery target temperature based on the charging power includes: determining the power interval corresponding to the charging power; obtaining the charging temperature corresponding to the power interval, each power interval corresponds to a preset charging temperature; and determining the charging temperature corresponding to the power interval as the battery target temperature.

[0130] In one possible implementation, the cooling power determination module 803 can be specifically used to: determine the change value of the battery temperature based on the current temperature of the battery and the target temperature of the battery; calculate 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 value of the battery temperature; determine the target cooling power based on the work required for the battery and the first duration.

[0131] In one possible implementation, the temperature control module 804 can be specifically used to: determine a target flow rate and a target inlet temperature based on a target cooling power, where 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; and control the temperature of the battery by adjusting the target flow rate and the target inlet temperature.

[0132] Exemplarily, the process of the temperature control module 804 controlling the temperature of the battery by adjusting the target flow rate and the target inlet temperature includes: determining the water pump opening duty cycle of the battery water pump 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; and controlling the temperature of the battery by adjusting the water pump opening duty cycle and the compressor speed. The actual inlet temperature is the actual temperature of the liquid before cooling the battery.

[0133] For example, the temperature control module 804 may be based on PWM=d*L t +e determines the pump opening duty cycle, L t is the target flow rate, d and e are the preset coefficients.

[0134] Exemplarily, the process in which the temperature control module 804 determines the compressor speed based on the difference between the actual inlet temperature and the target inlet temperature, and the rate of change of the actual inlet temperature includes: determining a preset temperature space corresponding to the above difference, wherein the number of the preset temperature spaces is multiple and each preset temperature space is different; determining a preset change rate space corresponding to the above change rate, wherein the number of the preset change rate spaces is multiple and each preset change rate space is different; and adjusting the compressor speed based on the preset temperature space corresponding to the above difference and the preset change rate space corresponding to the above change rate.

[0135] In one scenario, when the above-mentioned 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 by the speed corresponding to △T2*f, △T2 is the change rate, and f is the preset coefficient; if the change rate is greater than or equal to the second preset change rate, the speed of the compressor is decreased by the speed corresponding to △T2*f; 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.

[0136] In another scenario, when the above-mentioned difference is in the first 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 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 reduced 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 range is the first preset temperature.

[0137] In another scenario, when the above 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. 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.

[0138] In another scenario, 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. 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.

[0139] In another scenario, if the difference is in a 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.

[0140] In another scenario, 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 adjusted down 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 adjusted down 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 adjusted down by the seventh preset speed. 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.

[0141] The embodiment of the present application provides a vehicle, including an electronic device, the electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps in any of the above-mentioned battery temperature control method embodiments when executing the computer program, such as Figure 3 Steps 301 to 304 are shown.

[0142] The present application also provides a computer program product having a program code, which executes the steps of any of the above-mentioned battery temperature control method embodiments when the program code is run in a corresponding processor, controller, computing device or terminal, such as Figure 3 Steps 301 to 304 are shown.

[0143] Those skilled in the art will appreciate that the method and the equipment proposed in the embodiment of the present application can be implemented in various forms of hardware, software, firmware, a dedicated processor or a combination thereof. The dedicated 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 on a program storage device as an application. It is typically based on a machine with a computer platform having hardware, such as one or more central processing units (CPUs), random access memories (RAMs) 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 here may be part of an application, or a part thereof may be executed by an operating system.

[0144] Fig. 9 Schematic diagram of an electronic device provided in an embodiment of the present application. Fig. 9 As shown, the electronic device 900 of this embodiment includes: a processor 901, a memory 902, and a computer program 903 stored in the memory 902 and executable on the processor 901. When the processor 901 executes the computer program 903, the steps in the above tire monitoring method embodiments are implemented, for example Figure 3 Alternatively, when the processor 901 executes the computer program 903, the functions of each module / unit in the above-mentioned device embodiments are realized, for example Figure 8 Functionality of modules / units 801 to 804 shown.

[0145] Exemplarily, the computer program 903 may be divided into one or more modules / units, which are stored in the memory 902 and executed by the processor 901 to complete / implement the solution provided by the present application. The one or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program 903 in the electronic device 900. For example, the computer program 903 may be divided into Figure 8 Modules / units 801 to 804 are shown.

[0146] The electronic device 900 may be a vehicle controller, a mobile phone, a notebook, a PDA, a cloud server or other computing device. The electronic device 900 may include, but is not limited to, a processor 901 and a memory 902. Those skilled in the art will appreciate that Fig. 9It is only an example of the electronic device 900 and does not constitute a limitation of the electronic device 900. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 900 may also include input and output devices, network access devices, buses, etc.

[0147] The processor 901 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0148] The memory 902 may be an internal storage unit of the electronic device 900, such as a hard disk or 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 media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 900. Further, the memory 902 may also include both an internal storage unit of the electronic device 900 and an external storage device. The memory 902 is used to store the computer program and 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.

[0149] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0150] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0151] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0152] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0153] 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 distributed on multiple 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.

[0154] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0155] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned vehicle air conditioning control method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0156] In addition, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0157] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery temperature control method, characterized in that: include: 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, characterized in that: The determining the battery target temperature according to the charging power includes: 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 a target cooling power for the battery based on the battery target temperature, the battery current temperature, and the first duration includes: 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 step of controlling the temperature of the battery based on the target cooling power includes: 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 includes: 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 on 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: 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, includes: 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 includes: 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 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 also includes: 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, characterized in that: include: 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, the electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the battery temperature control method as described in any one of claims 1 to 9 are implemented.

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