Thermal management method and device for alternating current charging of power battery, vehicle and storage medium

Abstract

The invention discloses a thermal management method and device for alternating current charging of a power battery, electronic equipment and a storage medium, and the method comprises the steps: obtaining a charging current mapping table of the power battery and a charging parameter of a charging pile, so as to determine an optimal temperature interval of the power battery in a current electric quantity state; acquiring an actual temperature value of the power battery in the current electric quantity state; if the actual temperature value is smaller than the lower limit value of the optimal temperature interval, a target water inlet temperature value of the power battery is determined, and a heat management system is controlled to start heating according to the target water inlet temperature value; if the actual temperature value is larger than or equal to the lower limit value of the optimal temperature interval, the actual temperature value is in the optimal temperature interval of the current electric quantity state, and the heat management system is controlled to stop heating. The problem that the charging power of the power battery is reduced due to power consumption caused by heating the power battery in the vehicle in a low-temperature alternating-current slow charging scene can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management of batteries for new energy vehicles, and in particular to a thermal management method, device, vehicle and computer-readable storage medium for AC charging of a power battery. Background Art

[0002] The temperature of the power battery of new energy vehicles determines its charging efficiency. In the low-temperature AC slow charging scenario, when the power battery temperature is low, the current that the power battery can receive is low, and the charging speed is correspondingly reduced. In order to improve the charging efficiency of the power battery, the current heating strategy is designed with a liquid cooling / heating system for the power battery. When charging at low temperature AC, it implements a low-temperature AC charging heating thermal management control strategy, and exits the power battery heating when the power battery's state of charge reaches the target state of charge, or the power battery's state of charge reaches 100%, or the power battery's temperature reaches a certain temperature.

[0003] However, during the current power battery heating process, since the maximum charging power of the power battery is limited by the power of the charger and the heating power is consumed during heating, the charging power of the power battery is reduced, and the charging efficiency is subsequently low. Summary of the invention

[0004] In view of the above problems, the present application provides a thermal management method, device, vehicle and computer-readable storage medium for AC charging of a power battery, which are used to solve the problem of reduced charging efficiency due to heating of the power battery during AC low-temperature slow charging, and improve the charging efficiency of the power battery during low-temperature AC slow charging.

[0005] According to one aspect of an embodiment of the present application, a thermal management method for AC charging of a power battery is provided, the method comprising:

[0006] Obtaining a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge;

[0007] Obtaining an actual temperature value of the power battery at the current power state;

[0008] If the actual temperature value is less than the lower limit of the optimal temperature range, determining a target water inlet temperature value of the power battery, so as to control the thermal management system to start heating according to the target water inlet temperature value;

[0009] If the actual temperature value is greater than or equal to the lower limit of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

[0010] In an exemplary embodiment, when the actual temperature value is less than the lower limit of the optimal temperature range, the method further includes:

[0011] Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value;

[0012] Acquiring the power battery parameter information; wherein the power battery parameter information includes the power battery specific heat capacity, the power battery mass and the power battery heating efficiency;

[0013] A power battery temperature rise energy consumption value when the power battery is heated from the actual temperature value to the target temperature value is calculated according to the temperature difference and the power battery parameter information.

[0014] In an exemplary embodiment, the method further includes:

[0015] Acquiring parameter information of the liquid thermal medium in the thermal management system; wherein the parameter information of the liquid thermal medium includes an inlet water temperature value of the liquid thermal medium;

[0016] The temperature rise energy consumption values ​​of the liquid thermal working medium when the liquid thermal working medium is raised from multiple water inlet temperature values ​​to the target temperature value are calculated respectively according to the parameter information of the liquid thermal working medium, so as to obtain the temperature rise energy consumption values ​​of the liquid thermal working medium at multiple water inlet temperature values.

[0017] In an exemplary embodiment, the method further includes:

[0018] Obtaining a plurality of heating energy consumption values ​​of the power batteries according to the temperature rise energy consumption value of the power battery and a plurality of temperature rise energy consumption values ​​of the liquid thermal working fluids;

[0019] Determining the magnitude relationship of the heating energy consumption values ​​of the plurality of power batteries to obtain the lowest heating energy consumption value among the plurality of heating energy consumption values ​​of the power batteries;

[0020] The water inlet temperature value corresponding to the minimum heating energy consumption value is used as the target water inlet temperature value.

[0021] In an exemplary embodiment, when the actual temperature value is less than the lower limit of the optimal temperature range, the method further includes:

[0022] Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value;

[0023] Obtaining the ambient temperature of the current environment of the power battery;

[0024] The target water inlet temperature value of the power battery is determined by looking up a target water inlet temperature mapping table of the liquid thermal working medium according to the temperature difference and the ambient temperature.

[0025] In an exemplary embodiment, the charging parameters of the charging pile include the maximum charging current of the charging pile;

[0026] The acquiring of the charging current mapping table of the power battery and the charging parameters of the charging pile to determine the optimal temperature range of the power battery at the current state of charge further includes:

[0027] Acquire the maximum allowable charging current of the power battery at the current power state based on the charging current mapping table;

[0028] Compare the maximum allowable charging current with the maximum charging current of the charging pile and take the smaller value as the actual maximum charging current of the power battery at the current power state;

[0029] An optimal temperature range of the power battery at the current state of charge is determined according to a corresponding current of the power battery at the current state of charge and an actual maximum charging current.

[0030] In an exemplary embodiment, determining the optimal temperature range of the power battery at the current state of charge according to the corresponding current of the power battery at the current state of charge and the actual maximum charging current further includes:

[0031] Acquire a current corresponding to the power battery at a current state of charge based on the charging current mapping table;

[0032] Comparing the current corresponding to the current state of charge with the actual maximum charging current;

[0033] If the current corresponding to the current state of charge is greater than or equal to the actual maximum charging current, the current temperature range is determined, and the current temperature range is used as the optimal temperature range of the power battery at the current state of charge.

[0034] According to another aspect of an embodiment of the present application, a thermal management device for AC charging of a power battery is provided, the device comprising:

[0035] A determination module, used to obtain a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge;

[0036] An acquisition module, used to acquire an actual temperature value of the power battery at the current power state;

[0037] A control module is used to determine the target water inlet temperature value of the power battery if the actual temperature value is less than the lower limit value of the optimal temperature range, so as to control the thermal management system to turn on heating according to the target water inlet temperature value; if the actual temperature value is greater than or equal to the lower limit value of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

[0038] According to another aspect of an embodiment of the present application, a vehicle is provided, comprising:

[0039] Controller;

[0040] The memory is used to store one or more programs. When the one or more programs are executed by the controller, the controller implements the thermal management method for AC charging of the power battery mentioned above.

[0041] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program includes at least one executable instruction. When the executable instruction is run on a thermal management device / vehicle for AC charging of a power battery, the thermal management device / vehicle for AC charging of the power battery performs the operation of the thermal management method for AC charging of the power battery as described above.

[0042] In the thermal management method for AC charging of a power battery in an embodiment of the present application, when a user charges a vehicle through an AC charging pile, the vehicle will obtain the charging parameters of the charging pile, thereby determining the optimal temperature range of the vehicle's power battery in the current state of charge based on the charging parameters of the charging pile and the charging current mapping table of the vehicle's power battery, and obtaining the actual temperature value of the power battery in the current state of charge; then the actual power value of the power battery in the current state of charge is compared with the optimal temperature range, so that when the actual temperature of the power battery is greater than or equal to the lower limit of the optimal temperature range and is in the optimal temperature range, the battery thermal management system is controlled to turn off heating; when the actual temperature of the power battery is less than the lower limit of the optimal temperature range, the target water inlet temperature value of the power battery is further determined, so as to control the thermal management system to turn on heating according to the target water inlet temperature value, thereby avoiding the consumption of heating power of the thermal management system during the entire charging process, resulting in the occupation of the entire power, so as to reduce the problem of charging power. The optimal temperature range of the power battery is determined by combining the charging parameters of the charging pile and the power battery charging current mapping table, and then the actual temperature value is further compared with the optimal temperature range, and combined with the target water inlet temperature value of the power battery, so as to adaptively control the opening of the power battery thermal management system. This solves the problem of avoiding the consumption of heating power of the thermal management system during the entire charging process when the user charges the vehicle in the AC charging scenario, resulting in the occupation of the entire power and reducing the charging power. It improves the charging efficiency of the power battery during low-temperature AC slow charging.

[0043] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0045] Figure 1 A schematic diagram showing a flow chart of an embodiment of a thermal management method for AC charging of a power battery of the present application;

[0046] Figure 2 A schematic diagram showing a flow chart of an embodiment of a power battery temperature rise energy consumption value in a thermal management method for power battery AC charging of the present application;

[0047] Figure 3 A schematic flow chart showing an embodiment of the temperature rise energy consumption value of a liquid thermal working medium in the thermal management method for AC charging of a power battery of the present application;

[0048] Figure 4 A schematic diagram showing a flow chart of an embodiment of a target water inlet temperature in a thermal management method for AC charging of a power battery of the present application;

[0049] Figure 5 A schematic flow chart showing another embodiment of the target water inlet temperature in the thermal management method for AC charging of a power battery of the present application;

[0050] Figure 6 A schematic structural diagram of an embodiment of a thermal management device for AC charging of a power battery of the present application is shown;

[0051] Figure 7 A schematic structural diagram of an embodiment of an electronic device provided by the present application is shown. DETAILED DESCRIPTION

[0052] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0053] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0054] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0055] The term "multiple" as used in this application refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0056] First of all, it should be noted that the temperature of the power battery of a new energy vehicle determines its charging efficiency. When charging at different temperatures, it is necessary to query the corresponding charging current mapping table according to the battery state of charge (SOC) and temperature value of the power battery to obtain the charging current currently allowed by the power battery. In general, the charging current output by the charging pile can respond to the charging current required by the power battery, but due to the various charging pile products on the market, especially the fact that there are still many early charging piles on the market, their charging capacity is weak and the output current provided is low, which cannot meet the power battery requirements.

[0057] In the AC low-temperature charging scenario, when the power battery temperature is low, the current that the power battery can receive is low, and the charging speed is correspondingly reduced. In order to improve the charging efficiency of the power battery, a thermal management system (liquid cooling / heating system) is designed for the power battery of the vehicle. When charging at low temperature, it implements the low-temperature AC charging heating thermal management control strategy. The specific process is as follows: determine whether the thermal management system turns on the AC charging battery heating. If the lowest temperature T of the power battery is min ≤T0℃, it is determined that the AC slow charging heating conditions for the power battery are met, and the thermal management system is requested to set the power battery inlet water temperature T w If it is determined that the conditions for starting the AC slow charging and heating of the power battery are not met, the AC slow charging and heating of the thermal management system is kept off or the thermal management system is turned off; when the state of charge of the power battery reaches the target state of charge, or the state of charge of the power battery reaches 100%, or the temperature of the power battery reaches a certain temperature, the power battery heating is exited.

[0058] However, the low-temperature AC charging heating thermal management control strategy only targets the lowest temperature T of the power battery. min The thermal management system is judged whether to turn on heating, and fails to take into account that the maximum charging power during AC charging is limited by the power of the charger (On-Board Charger, OBC) and the consumption of heating power during heating, resulting in low efficiency of low-temperature AC charging.

[0059] To solve the above problems, please refer to Figure 1 , the present application exemplarily shows a flow chart of a thermal management method for AC charging of a power battery.

[0060] Among them, the execution subject of the thermal management method for AC charging of power batteries can be a terminal device or a server or other processing device, wherein the terminal device can be a user equipment (UE), a computer, a mobile device, a user terminal, a terminal, a cellular phone, a personal digital assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. The execution subject of the thermal management method for AC charging of power batteries can also be a car. In some possible implementations, the thermal management method for AC charging of power batteries can be implemented by a processor calling a computer-readable instruction stored in a memory.

[0061] Specifically, the thermal management method for AC charging of a power battery in this embodiment includes the following steps:

[0062] Step S100, obtaining a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge;

[0063] Among them, the charging current mapping table is the charging map table, which refers to the charging table for the power battery that records the charging current rate under different terminal voltages and different temperature conditions. The charging parameters of the charging pile can be the maximum charging current (rated charging current), maximum charging voltage (rated charging voltage), charging power (rated charging power), etc. that the charging pile can output to the vehicle through the charging gun when the charging gun of the charging pile is connected to the charging port of the vehicle.

[0064] In this embodiment, the current state of charge can be 30%, 50%, 70% of the power battery's state of charge, etc., and no specific limitation is made here. Based on the power battery's charging current mapping table and the charging parameters of the charging pile, the optimal temperature range under any state of charge can be determined, so that the vehicle can adaptively adjust the thermal management strategy of the power battery AC charging.

[0065] For example, if the current state of charge of the power battery is 50% and the charging parameters of the charging pile are charging current of 150A, charging voltage of 800V, and charging power of 120KW / h, then it is necessary to look up the charging current mapping table of the power battery when the current state of charge is 50%, and calculate the optimal temperature range of the power battery when the current state of charge is 50% in combination with the charging parameters of the charging pile with charging current of 150A, charging voltage of 800V, and charging power of 120KW / h. It should be understood that the optimal temperature range can be an adaptive temperature range for charging the vehicle power battery while meeting user needs and controlling charging energy consumption, charging efficiency, and charging cost.

[0066] In an exemplary embodiment, in order to specifically illustrate the optimal temperature range of the power battery in the current state of charge, the charging parameters of the charging pile in this embodiment include the maximum charging current of the charging pile, so as to determine the actual maximum charging current of the power battery during the charging process in combination with the maximum charging current of the charging pile; specifically: based on the charging current mapping table, the maximum allowable charging current of the power battery in the current state of charge is obtained, and the maximum allowable charging current is compared with the maximum charging current of the charging pile and the smaller value is taken as the actual maximum charging current of the power battery in the current state of charge; based on the charging current mapping table, the corresponding current of the power battery in the current state of charge is obtained; the corresponding current of the current state of charge is compared with the actual maximum charging current; if the corresponding current of the current state of charge is greater than or equal to the actual maximum charging current, the current temperature range is determined, and the current temperature range is used as the optimal temperature range of the power battery in the current state of charge.

[0067] In this embodiment, the maximum allowable charging current refers to the maximum charging current allowed for the power battery input of the vehicle displayed in the charging current mapping table when the power battery is in the current state of charge. The input charging current must not exceed this maximum allowable charging current when charging the power battery of the vehicle. Since the actual maximum charging current is the smaller value between the maximum allowable charging current and the maximum charging current of the charging pile, the corresponding current of the power battery in the current state of charge in the table-checking charging current mapping table is greater than or equal to the actual maximum charging current, so that the temperature range of the power battery in this case at the current state of charge can be obtained, and the temperature range at this time can be used as the optimal temperature range of the power battery in the current state of charge. Through the determination of the optimal temperature range in this embodiment, the power battery can achieve better charging efficiency when charging in this optimal temperature range.

[0068] For example, assuming that the current state of charge of the power battery is SOC x(x=1,2……n; n is the different SOC value of the power battery. If the preset power charging target is not set, n=100 by default). The maximum allowable charging current in the current power state of the table is Imax0. x (x=1,2……n); then the maximum allowable charging current Imax0 of the current power state is x Compare with the maximum charging current Imax of the charging pile and take the smaller value, that is, MIN(Imax0 x , Imax pile), so as to obtain the actual maximum charging current Imax of the power battery under different SOC values x (x=1, 2...n); At this time, the corresponding power SOC of the power battery is checked through the charging current mapping table x The state meets the conditions: I 理论 ≥Imax x The temperature range (T1x, T2x) is used as the power battery at the corresponding power SOC x The optimal temperature range (T1x, T2x) under the state.

[0069] Step S200, obtaining an actual temperature value of the power battery at the current power state;

[0070] Step S300: If the actual temperature value is less than the lower limit of the optimal temperature range, the target water inlet temperature value of the power battery is determined to control the thermal management system to turn on heating according to the target water inlet temperature value; if the actual temperature value is greater than or equal to the lower limit of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

[0071] Among them, the battery thermal management system in this application can refer to a battery thermal management liquid thermal system, or other thermal management systems such as a heat pump air conditioning system, a PTC thermal management system, etc., and it can be applied according to actual conditions and is not specifically limited here.

[0072] For this embodiment, if the current state of charge of the power battery is 30%, the optimal temperature range of the power battery at the current state of charge of 30% is determined to be [35°C, 50°C] through the charging current mapping table of the power battery and the maximum charging current of the charging pile, and the actual temperature value of the power battery at the current state of charge of 30% is 30°C. At this time, the actual temperature value of the power battery is less than the lower limit of the optimal temperature range, and it is necessary to further determine the target water inlet temperature value of the power battery to control the heating of the thermal management system by the size of the target water inlet temperature value; if the actual temperature value of the current state of charge of the power battery is 30% is 40°C, then the actual temperature value of the power battery is greater than the lower limit of the optimal temperature range, and is in the optimal temperature range of the current state of charge, indicating that the power battery is more suitable for charging at this temperature, and the thermal management system does not need to assist in heating or cooling, and the thermal management system can be directly controlled to turn off heating, or keep the thermal management system turned off.

[0073] The above embodiment determines the optimal temperature range of the power battery by combining the maximum charging current of the charging pile and the power battery charging current mapping table, and then further adaptively controls the activation of the power battery thermal management system based on the comparison between the actual temperature value and the optimal temperature range and the target water inlet temperature value of the power battery. This solves the problem of avoiding the consumption of heating power of the thermal management system during the entire charging process, which leads to the occupation of the entire power and reduces the charging power when the user charges the vehicle in the AC charging scenario, and improves the charging efficiency of the power battery during low-temperature AC slow charging.

[0074] In an exemplary embodiment, see Figure 2 As shown, Figure 2 A schematic flow chart of the power battery temperature rise energy consumption value in the thermal management method for AC charging of the power battery of the present application is shown. In combination with the above embodiment, when the actual temperature value of the current power state of the power battery is less than the lower limit value of the optimal temperature range, the method further includes:

[0075] Step S310: taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value.

[0076] Among them, the lower limit value of the optimal temperature range of the current state of charge is used as the target temperature value, that is, as the temperature value for controlling the thermal management system to turn off the heating, and then combined with the actual temperature value of the power battery at the current state of charge to obtain the temperature difference; for example, if the current state of charge of the power battery is 30%, the optimal temperature range at this time is [35℃, 50℃], then the lower limit value of the optimal temperature range of the power battery when the state of charge is 30% is T1 m=35℃, assuming that the actual temperature of the power battery when the state of charge is 30% is T m =30℃; that is, the actual temperature of the power battery when the state of charge is 30% is T1 m =30℃, target temperature is T m =35℃, the temperature difference at this time is △T B =T1 m -T m =35℃-30℃=5℃.

[0077] Step S311, obtaining the power battery parameter information;

[0078] Step S312, calculating a power battery temperature rise energy consumption value when the power battery is raised from the actual temperature value to the target temperature value according to the temperature difference and the power battery parameter information.

[0079] In this embodiment, after obtaining the temperature difference of the power battery under the current power state, the power battery temperature rise energy consumption value when the power battery is raised from the actual temperature value to the target temperature value can be calculated according to the temperature difference and the power battery parameter information. The power battery parameter information may include the power battery specific heat capacity, the power battery mass and the power battery heating efficiency. Specifically, the temperature rise energy consumption value of the power battery itself during the charging process can be obtained through the power battery temperature rise energy consumption calculation formula. The power battery temperature rise energy consumption calculation formula is:

[0080] E B =C b m b △T B / η1;

[0081] In the calculation formula of the temperature rise energy consumption of the power battery, E B is the power battery temperature rise energy consumption value when the power battery rises from the actual temperature value to the target temperature value, C b Power battery specific heat capacity, m b The mass of the power battery, η1 is the heating efficiency of the power battery.

[0082] Through this embodiment, the power battery temperature rise energy consumption value when the power battery is raised from the actual temperature value to the target temperature value can be obtained through parameter information such as the specific heat capacity, mass and heating efficiency of the power battery, as well as the temperature difference of the power battery determined above at the current power state.

[0083] In an exemplary embodiment, see Figure 3 As shown, Figure 3 The schematic diagram of the flow chart of the temperature rise energy consumption value of the liquid thermal working medium in the thermal management method of AC charging of the power battery of the present application is shown. In combination with the above embodiment, when the power battery is in the current power state, the temperature rise energy consumption value of the liquid thermal working medium specifically includes:

[0084] Step S320, obtaining parameter information of the liquid thermal medium in the thermal management system;

[0085] Step S321, calculating the temperature rise energy consumption values ​​of the liquid thermal working medium when the liquid thermal working medium is raised from multiple water inlet temperature values ​​to the target temperature value according to the parameter information of the liquid thermal working medium, so as to obtain the temperature rise energy consumption values ​​of the liquid thermal working medium at multiple water inlet temperature values.

[0086] Among them, the parameter information of the liquid thermal medium includes the inlet water temperature value of the liquid thermal medium. The liquid thermal medium may include multiple inlet water temperature values. Combined with the multiple inlet water temperature values ​​of the liquid thermal medium, multiple liquid thermal medium temperature rise energy consumption values ​​are calculated for the inlet water temperature value to increase to the target temperature value. In the specific implementation process, the temperature rise energy consumption value of the liquid thermal medium itself during the charging process of the power battery can be calculated by the liquid thermal medium temperature rise energy consumption calculation formula. The liquid thermal medium temperature rise energy consumption calculation formula is:

[0087] E w =C w ρ w V w (T wt -T wm ) / η2;

[0088] In the calculation formula of temperature rise energy consumption of liquid thermal medium, E w is the energy consumption value of the temperature rise of the liquid thermal medium in the power battery thermal management system from the inlet water temperature value to the target temperature value, C w is the specific heat capacity of the liquid thermal medium, ρ w is the density of liquid thermal medium, V w is the volume of liquid thermal medium, T wt is the target temperature of the liquid thermal medium, T wm is the inlet water temperature value of the liquid thermal medium, and η2 is the liquid thermal medium efficiency. It should be noted that the different inlet water temperature values ​​of the liquid thermal medium are T wm , T wm+1 ..., T max , T max The maximum water inlet temperature allowed by the power battery is calculated by combining the liquid thermal working fluid temperature rise energy consumption calculation formula to calculate the liquid thermal working fluid temperature rise energy consumption required for each water inlet temperature value.

[0089] For further information, see Figure 4 As shown, Figure 4 The schematic diagram of the target water inlet temperature in the thermal management method of AC charging of the power battery in this application is shown. Figure 2 The power battery temperature rise energy consumption value obtained in the embodiment, and the above Figure 3 The temperature rise energy consumption value of the liquid thermal working medium obtained in the embodiment is used to determine the target water inlet temperature of the power battery, specifically including:

[0090] Step S330, obtaining heating energy consumption values ​​of a plurality of the power batteries according to the temperature rise energy consumption value of the power battery and a plurality of temperature rise energy consumption values ​​of the liquid thermal working fluids;

[0091] Step S331, determining the magnitude relationship of the heating energy consumption values ​​of the plurality of power batteries to obtain the lowest heating energy consumption value among the plurality of heating energy consumption values ​​of the power batteries;

[0092] Step S332: taking the water inlet temperature value corresponding to the minimum heating energy consumption value as the target water inlet temperature value.

[0093] Among them, since the inlet water temperature value of the liquid thermal working fluid includes multiple inlet water temperature values, after the multiple inlet water temperature values ​​of the liquid thermal working fluid calculated in the above embodiment are respectively increased to multiple liquid thermal working fluid temperature rise energy consumption values ​​of the target temperature value, the temperature rise energy consumption values ​​of the multiple liquid thermal working fluids are respectively summed with the temperature rise energy consumption value of the power battery itself, thereby obtaining multiple heating energy consumption values ​​for heating the power battery, and the minimum heating energy consumption value among the multiple heating energy consumption values ​​is obtained by judging the size relationship of the multiple heating energy consumption values, and the inlet water temperature value corresponding to this minimum heating energy consumption value is used as the target inlet water temperature value.

[0094] For example, the heating energy consumption value of the power battery is E 0x The power battery's own temperature rise energy consumption value is E Bx , the temperature rise energy consumption value of the liquid thermal medium is E wx , then the heating energy consumption value of the power battery is E 0x =E Bx +E wx (x represents different water inlet temperature values); Combine the calculated heating energy consumption values ​​of multiple power batteries to calculate the minimum heating energy consumption value MIN E0x , with this minimum heating energy consumption value MIN E0x As the final target water inlet temperature value. Through this embodiment, during the entire charging process of the power battery, when the heating of the thermal management system is controlled to be turned on, the influence of the temperature rise energy consumption of the liquid thermal fluid on the overall heating energy consumption value is avoided, the temperature rise energy consumption of the liquid thermal fluid is effectively controlled, and the charging efficiency of the power battery during low-temperature AC slow charging is improved.

[0095] In an exemplary embodiment, in order to determine the target water inlet temperature of the power battery, it is also possible to refer to the following Figure 5 The process diagram of determining the target water inlet temperature through the target water inlet temperature mapping table of the liquid thermal medium is shown. Specifically, when the actual temperature value is less than the lower limit of the optimal temperature range, the method further includes:

[0096] Step S340, taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value;

[0097] Step S341, obtaining the ambient temperature of the current environment of the power battery;

[0098] Step S342, looking up a target water inlet temperature mapping table of a liquid thermal medium according to the temperature difference and the ambient temperature to determine a target water inlet temperature value of the power battery.

[0099] In this embodiment, different from the above-mentioned inlet water temperature value of the liquid thermal working fluid, a target inlet water temperature mapping table 1 of the temperature rise difference between the target temperature value for heating and the actual temperature value of the current power state and the optimal target inlet water temperature value of the liquid thermal working fluid is obtained through pre-calibration. The target inlet water temperature mapping table can be directly looked up by the obtained ambient temperature and temperature rise difference to obtain the corresponding target inlet water temperature value, so that the optimal target inlet water temperature value of the liquid thermal working fluid can be obtained with less data support, so as to reduce the influence of the temperature rise energy consumption of the liquid thermal working fluid on the overall heating energy consumption value, effectively control the temperature rise energy consumption of the liquid thermal working fluid, and improve the charging efficiency of the power battery during low-temperature AC slow charging, which is convenient for practical application.

[0100]

[0101] Table 1

[0102] Figure 6 The schematic diagram of the structure of the embodiment of the thermal management device for AC charging of power batteries in this application is shown. Figure 6 As shown, the thermal management device 400 for AC charging of a power battery includes: a determination module 410, an acquisition module 420 and a control module 430;

[0103] The determination module 410 is used to obtain a charging current mapping table of the power battery and a charging parameter of the charging pile to determine an optimal temperature range of the power battery at a current state of charge;

[0104] An acquisition module 420 is used to acquire an actual temperature value of the power battery at the current power state;

[0105] The control module 430 is used to determine the target water inlet temperature value of the power battery if the actual temperature value is less than the lower limit value of the optimal temperature range, so as to control the thermal management system to turn on heating according to the target water inlet temperature value; if the actual temperature value is greater than or equal to the lower limit value of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

[0106] It should be noted that the thermal management device 400 for AC charging of a power battery provided in the above embodiment and the thermal management method for AC charging of a power battery provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiment and will not be repeated here.

[0107] See Figure 7 As shown, Figure 7 A schematic diagram of the structure of an embodiment of the vehicle of the present application is shown, which shows a schematic diagram of the structure of a computer system of the vehicle suitable for implementing the embodiment of the present application. The specific embodiment of the present application does not limit the specific implementation of the vehicle.

[0108] See also Figure 7 As shown, the vehicle includes: a controller; a memory for storing one or more programs, and when the one or more programs are executed by the controller, the above-mentioned thermal management method for AC charging of the power battery is executed.

[0109] Please continue reading Figure 7 As shown, the computer system 500 of the vehicle includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503, such as executing the method in the above embodiment. In RAM 503, various programs and data required for system operation are also stored. CPU 501, ROM 502 and RAM 503 are connected to each other through bus 504. Input / output (I / O) interface 505 is also connected to bus 504.

[0110] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0111] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 509, and / or installed from a removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0112] Another aspect of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the thermal management method for AC charging of a power battery as described above. The computer-readable storage medium may be included in the vehicle described in the above embodiment, or may exist independently without being assembled into the vehicle.

[0113] Another aspect of the present application further provides a computer program product or a computer program, the computer program product or the computer program comprising at least one executable instruction, when the executable instruction is run on a thermal management device / vehicle for AC charging of a power battery, the thermal management device / vehicle for AC charging of a power battery executes the thermal management method for AC charging of a power battery as described below, the method comprising:

[0114] Obtaining a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge;

[0115] Obtaining an actual temperature value of the power battery at the current power state;

[0116] If the actual temperature value is less than the lower limit of the optimal temperature range, determining a target water inlet temperature value of the power battery, so as to control the thermal management system to start heating according to the target water inlet temperature value;

[0117] If the actual temperature value is greater than or equal to the lower limit of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

[0118] In an exemplary embodiment, the executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0119] Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value;

[0120] Acquiring the power battery parameter information; wherein the power battery parameter information includes the power battery specific heat capacity, the power battery mass and the power battery heating efficiency;

[0121] A power battery temperature rise energy consumption value when the power battery is heated from the actual temperature value to the target temperature value is calculated according to the temperature difference and the power battery parameter information.

[0122] In an exemplary embodiment, the executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0123] Acquiring parameter information of the liquid thermal medium in the thermal management system; wherein the parameter information of the liquid thermal medium includes an inlet water temperature value of the liquid thermal medium;

[0124] The temperature rise energy consumption values ​​of the liquid thermal working medium when the liquid thermal working medium is raised from multiple water inlet temperature values ​​to the target temperature value are calculated respectively according to the parameter information of the liquid thermal working medium, so as to obtain the temperature rise energy consumption values ​​of the liquid thermal working medium at multiple water inlet temperature values.

[0125] In an exemplary embodiment, the executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0126] Obtaining a plurality of heating energy consumption values ​​of the power batteries according to the temperature rise energy consumption value of the power battery and a plurality of temperature rise energy consumption values ​​of the liquid thermal working fluids;

[0127] Determining the magnitude relationship of the heating energy consumption values ​​of the plurality of power batteries to obtain the lowest heating energy consumption value among the plurality of heating energy consumption values ​​of the power batteries;

[0128] The water inlet temperature value corresponding to the minimum heating energy consumption value is used as the target water inlet temperature value.

[0129] In an exemplary embodiment, the executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0130] Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value;

[0131] Obtaining the ambient temperature of the current environment of the power battery;

[0132] The target water inlet temperature value of the power battery is determined by looking up a target water inlet temperature mapping table of the liquid thermal working medium according to the temperature difference and the ambient temperature.

[0133] In an exemplary embodiment, the charging parameters of the charging pile include the maximum charging current of the charging pile;

[0134] The executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0135] Acquire the maximum allowable charging current of the power battery at the current power state based on the charging current mapping table;

[0136] Compare the maximum allowable charging current with the maximum charging current of the charging pile and take the smaller value as the actual maximum charging current of the power battery at the current power state;

[0137] An optimal temperature range of the power battery at the current state of charge is determined according to a corresponding current of the power battery at the current state of charge and an actual maximum charging current.

[0138] In an exemplary embodiment, the executable instructions may also be used to enable the thermal management device / vehicle for AC charging of the power battery to perform the following operations:

[0139] Acquire a current corresponding to the power battery at a current state of charge based on the charging current mapping table;

[0140] Comparing the current corresponding to the current state of charge with the actual maximum charging current;

[0141] If the current corresponding to the current state of charge is greater than or equal to the actual maximum charging current, the current temperature range is determined, and the current temperature range is used as the optimal temperature range of the power battery at the current state of charge.

[0142] In the thermal management method for AC charging of a power battery in an embodiment of the present application, when a user charges a vehicle through an AC charging pile, the vehicle will obtain the charging parameters of the charging pile, thereby determining the optimal temperature range of the vehicle's power battery in the current state of charge based on the charging parameters of the charging pile and the charging current mapping table of the vehicle's power battery, and obtaining the actual temperature value of the power battery in the current state of charge; then the actual power value of the power battery in the current state of charge is compared with the optimal temperature range, so that when the actual temperature of the power battery is greater than or equal to the lower limit of the optimal temperature range and is in the optimal temperature range, the battery thermal management system is controlled to turn off heating; when the actual temperature of the power battery is less than the lower limit of the optimal temperature range, the target water inlet temperature value of the power battery is further determined, so as to control the thermal management system to turn on heating according to the target water inlet temperature value, thereby avoiding the consumption of heating power of the thermal management system during the entire charging process, resulting in the occupation of the entire power, so as to reduce the problem of charging power. The optimal temperature range of the power battery is determined by combining the charging parameters of the charging pile and the power battery charging current mapping table, and then the actual temperature value is further compared with the optimal temperature range, and combined with the target water inlet temperature value of the power battery, so as to adaptively control the opening of the power battery thermal management system. This solves the problem of avoiding the consumption of heating power of the thermal management system during the entire charging process when the user charges the vehicle in the AC charging scenario, resulting in the occupation of the entire power and reducing the charging power. It improves the charging efficiency of the power battery during low-temperature AC slow charging.

[0143] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, wherein a computer-readable computer program is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0144] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0145] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0146] According to one aspect of an embodiment of the present application, a computer system is also provided, including a central processing unit (CPU), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage portion into a random access memory (RAM), such as executing the method in the above embodiment. In RAM, various programs and data required for system operation are also stored. CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0147] The following components are connected to the I / O interface: an input part including a keyboard, a mouse, etc.; an output part including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage part including a hard disk, etc.; and a communication part including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that the computer program read therefrom is installed into the storage part as needed.

[0148] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

[0149] The collection and processing of relevant data in this application should be strictly in accordance with the requirements of relevant national laws and regulations when applied in the embodiments, and the informed consent or separate consent of the personal information subject should be obtained, and subsequent data use and processing should be carried out within the scope of authorization of laws and regulations and the personal information subject.

Claims

1. A thermal management method for AC charging of a power battery, characterized in that: The method comprises: Obtaining a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge; Obtaining an actual temperature value of the power battery at the current power state; If the actual temperature value is less than the lower limit of the optimal temperature range, determining a target water inlet temperature value of the power battery, so as to control the thermal management system to start heating according to the target water inlet temperature value; If the actual temperature value is greater than or equal to the lower limit of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

2. The thermal management method for AC charging of a power battery according to claim 1, characterized in that: When the actual temperature value is less than the lower limit of the optimal temperature range, the method further includes: Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value; Acquiring the power battery parameter information; wherein the power battery parameter information includes the power battery specific heat capacity, the power battery mass and the power battery heating efficiency; A power battery temperature rise energy consumption value when the power battery is heated from the actual temperature value to the target temperature value is calculated according to the temperature difference and the power battery parameter information.

3. The thermal management method for AC charging of a power battery according to claim 2, characterized in that: The method further comprises: Acquiring parameter information of the liquid thermal medium in the thermal management system; wherein the parameter information of the liquid thermal medium includes an inlet water temperature value of the liquid thermal medium; The temperature rise energy consumption values ​​of the liquid thermal working medium when the liquid thermal working medium is raised from multiple water inlet temperature values ​​to the target temperature value are calculated respectively according to the parameter information of the liquid thermal working medium, so as to obtain the temperature rise energy consumption values ​​of the liquid thermal working medium at multiple water inlet temperature values.

4. The thermal management method for AC charging of a power battery according to claim 3, characterized in that: The method further comprises: Obtaining a plurality of heating energy consumption values ​​of the power batteries according to the temperature rise energy consumption value of the power battery and a plurality of temperature rise energy consumption values ​​of the liquid thermal working fluids; Determining the magnitude relationship of the heating energy consumption values ​​of the plurality of power batteries to obtain the lowest heating energy consumption value among the plurality of heating energy consumption values ​​of the power batteries; The water inlet temperature value corresponding to the minimum heating energy consumption value is used as the target water inlet temperature value.

5. The thermal management method for AC charging of a power battery according to claim 1, characterized in that: When the actual temperature value is less than the lower limit of the optimal temperature range, the method further includes: Taking the lower limit of the optimal temperature range of the current state of charge as the target temperature value, and determining the temperature difference between the actual temperature value of the power battery at the current state of charge and the target temperature value; Obtaining the ambient temperature of the current environment of the power battery; The target water inlet temperature value of the power battery is determined by looking up a target water inlet temperature mapping table of the liquid thermal working medium according to the temperature difference and the ambient temperature.

6. The thermal management method for AC charging of a power battery according to claim 1, characterized in that: The charging parameters of the charging pile include the maximum charging current of the charging pile; The acquiring of the charging current mapping table of the power battery and the charging parameters of the charging pile to determine the optimal temperature range of the power battery at the current state of charge further includes: Acquire the maximum allowable charging current of the power battery at the current power state based on the charging current mapping table; Compare the maximum allowable charging current with the maximum charging current of the charging pile and take the smaller value as the actual maximum charging current of the power battery at the current power state; An optimal temperature range of the power battery at the current state of charge is determined according to a corresponding current of the power battery at the current state of charge and an actual maximum charging current.

7. The thermal management method for AC charging of a power battery according to claim 6, characterized in that: The determining the optimal temperature range of the power battery at the current state of charge according to the corresponding current of the power battery at the current state of charge and the actual maximum charging current further includes: Acquire a current corresponding to the power battery at a current state of charge based on the charging current mapping table; Comparing the current corresponding to the current state of charge with the actual maximum charging current; If the current corresponding to the current state of charge is greater than or equal to the actual maximum charging current, the current temperature range is determined, and the current temperature range is used as the optimal temperature range of the power battery at the current state of charge.

8. A thermal management device for AC charging of a power battery, characterized in that: The device comprises: A determination module, used to obtain a charging current mapping table of the power battery and charging parameters of the charging pile to determine an optimal temperature range of the power battery at a current state of charge; An acquisition module, used to acquire an actual temperature value of the power battery at the current power state; A control module is used to determine the target water inlet temperature value of the power battery if the actual temperature value is less than the lower limit value of the optimal temperature range, so as to control the thermal management system to turn on heating according to the target water inlet temperature value; if the actual temperature value is greater than or equal to the lower limit value of the optimal temperature range, the actual temperature value is in the optimal temperature range of the current power state, and the thermal management system is controlled to turn off heating.

9. A vehicle, characterized in that: include: Controller; A memory for storing one or more programs. When the one or more programs are executed by the controller, the controller implements the thermal management method for AC charging of a power battery as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which includes at least one executable instruction. When the executable instruction is run on the thermal management device / vehicle for AC charging of a power battery, the thermal management device / vehicle for AC charging of a power battery performs the operation of the thermal management method for AC charging of a power battery as described in any one of claims 1 to 7.

Images