Methods, devices, vehicle controllers, and media for controlling battery cell temperature in electric vehicles

Abstract

This application provides a method, device, vehicle controller, and medium for controlling the cell temperature of an electric vehicle, relating to the field of electric vehicle technology. The method includes: responding to an activation operation and a mode selection operation of a smart cell temperature mode for the electric vehicle; determining a target temperature control mode from multiple temperature control modes within the smart cell temperature mode; acquiring cell status information and electric vehicle operating status information matching the target temperature control mode, the operating status information including at least the distance between the electric vehicle and its destination; determining a target coolant temperature based on the cell status information and the operating status information; and adjusting the cell coolant temperature based on the target coolant temperature to adjust the cell temperature. This application intelligently determines the coolant temperature based on the vehicle's operating status and the cell's status, enabling intelligent thermal management of the cell temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a battery temperature control method and device for electric vehicles, a vehicle controller and a medium. BACKGROUND

[0002] In the battery thermal management technology of new energy vehicles, the battery core needs to reach a very high temperature in summer to respond to the cooling demand, and needs to reach a very low temperature in winter to respond to the heating demand for energy saving consideration. The cooling threshold and heating threshold of the battery core are fixed values, and the target temperature of the battery core and the coolant temperature are also fixed values.

[0003] However, in the actual use of new energy vehicles, the fixed battery core thermal management threshold can ensure that the battery core temperature is within a safe range and ensure normal driving of the vehicle, but it will increase energy consumption and cannot meet the intelligent demand of users for new energy vehicles. SUMMARY

[0004] The present application aims to overcome the above-mentioned deficiencies in the prior art, and provides a battery temperature control method and device for electric vehicles, a vehicle controller and a medium, so as to intelligently determine the coolant temperature according to the running state of the vehicle and the state of the battery core, and intelligently manage the temperature of the battery core.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application provide a battery temperature control method for electric vehicles, which comprises:

[0007] In response to an opening operation and a mode selection operation of an intelligent temperature mode for the battery core of the electric vehicle, a target temperature control mode is determined from a plurality of temperature control modes in the intelligent temperature mode for the battery core;

[0008] Obtain battery state information matched with the target temperature control mode and running state information of the electric vehicle, wherein the running state information at least includes a distance value between the electric vehicle and a destination;

[0009] Determine a coolant target temperature according to the battery state information and the running state information;

[0010] Adjust the battery coolant temperature according to the coolant target temperature to adjust the battery core temperature.

[0011] Optionally, the target temperature control mode is a non-energy-saving temperature control mode, and the battery state information includes a battery remaining capacity. The determination of the coolant target temperature according to the battery state information and the running state information comprises:

[0012] determining whether to enter the non-energy-saving temperature control mode according to the distance value and the remaining power of the battery cell;

[0013] after determining to enter the non-energy-saving temperature control mode, judging whether the battery cell meets a temperature pre-adjustment condition;

[0014] if the battery cell meets the temperature pre-adjustment condition, determining the target temperature of the coolant according to the remaining power of the battery cell.

[0015] Optionally, the non-energy-saving temperature control mode is an automatic temperature control mode, and the battery cell state information further comprises a battery cell temperature, and the judging whether the battery cell meets the temperature pre-adjustment condition comprises:

[0016] judging whether the battery cell meets the temperature pre-adjustment condition according to the distance value and the battery cell temperature.

[0017] Optionally, the non-energy-saving temperature control mode is a default temperature control mode, and the battery cell state information further comprises a battery cell temperature, and the judging whether the battery cell meets the temperature pre-adjustment condition comprises:

[0018] judging whether the battery cell meets the temperature pre-adjustment condition according to the battery cell temperature.

[0019] Optionally, the determining the target temperature of the coolant according to the remaining power of the battery cell comprises:

[0020] determining a best charging temperature of the battery cell according to an ambient temperature;

[0021] determining a best temperature of the coolant according to the best charging temperature of the battery cell;

[0022] determining the target temperature of the coolant according to the best temperature of the coolant and the remaining power of the battery cell.

[0023] Optionally, the temperature control mode is an energy-saving temperature control mode, and the battery cell state information comprises a battery cell temperature, and the determining the target temperature of the coolant according to the battery cell state information and the running state information comprises:

[0024] determining the target temperature of the coolant and a target battery cell heating threshold according to the distance value and the battery cell temperature.

[0025] Optionally, the determining the target temperature of the coolant and the target battery cell heating threshold according to the distance value between the electric vehicle and a preset destination and the battery cell temperature comprises:

[0026] if the distance value is greater than a preset distance threshold value, and the battery cell temperature is greater than a preset temperature threshold value, reducing a preset coolant temperature and a preset battery cell heating threshold value, determining the coolant target temperature and the target battery cell heating threshold value;

[0027] if the distance value is less than or equal to the preset distance threshold value, or the battery cell temperature is less than or equal to the preset temperature threshold value, determining the coolant target temperature as the preset coolant temperature, and the target battery cell heating threshold value as the preset battery cell heating threshold value.

[0028] In a second aspect, the embodiments of the present application further provide a battery cell temperature control device of an electric vehicle, the device comprising:

[0029] a control mode determination module configured to determine a target temperature control mode from a plurality of temperature control modes in a battery cell intelligent temperature mode of the electric vehicle in response to an opening operation of the battery cell intelligent temperature mode and a mode selection operation;

[0030] a state information acquisition module configured to acquire battery cell state information matched with the target temperature control mode and running state information of the electric vehicle, the running state information at least including a distance value between the electric vehicle and a destination;

[0031] a target temperature determination module configured to determine a coolant target temperature according to the battery cell state information and the running state information;

[0032] a temperature adjustment module configured to adjust a battery cell coolant temperature according to the coolant target temperature to adjust a battery cell temperature.

[0033] Optionally, the target temperature control mode is a non-energy-saving temperature control mode, the battery cell state information includes a battery cell remaining capacity, and the target temperature determination module is specifically configured to determine whether to enter the non-energy-saving temperature control mode according to the distance value and the battery cell remaining capacity, determine whether a battery cell satisfies a temperature pre-adjustment condition after determining to enter the non-energy-saving temperature control mode, and determine the coolant target temperature according to the battery cell remaining capacity if the battery cell satisfies the temperature pre-adjustment condition.

[0034] Optionally, the non-energy-saving temperature control mode is an automatic temperature control mode, the battery cell state information further includes a battery cell temperature, and the target temperature determination module is further configured to determine whether the battery cell satisfies the temperature pre-adjustment condition according to the distance value and the battery cell temperature.

[0035] Optionally, the non-energy-saving temperature control mode is a default temperature control mode, and the battery cell state information further comprises a battery cell temperature, and the target temperature determination module is further configured to determine whether the battery cell satisfies the temperature pre-adjustment condition according to the battery cell temperature.

[0036] Optionally, the target temperature determination module is specifically configured to determine a battery cell optimal charging temperature according to an ambient temperature, determine a coolant optimal temperature according to the battery cell optimal charging temperature, and determine the coolant target temperature according to the coolant optimal temperature and the battery cell remaining capacity.

[0037] Optionally, the temperature control mode is an energy-saving temperature control mode, and the battery cell state information comprises a battery cell temperature, and the target temperature determination module is further configured to determine the coolant target temperature and a target battery cell heating threshold according to the distance value and the battery cell temperature.

[0038] Optionally, the target temperature determination module is specifically configured to, if the distance value is greater than a preset distance threshold value and the battery cell temperature is greater than a preset temperature threshold value, reduce a preset coolant temperature and a preset battery cell heating threshold to determine the coolant target temperature and the target battery cell heating threshold; and if the distance value is less than or equal to the preset distance threshold value or the battery cell temperature is less than or equal to the preset temperature threshold value, determine that the coolant target temperature is the preset coolant temperature and the target battery cell heating threshold is the preset battery cell heating threshold.

[0039] In a third aspect, an embodiment of the present application further provides a vehicle controller, comprising a processor, a storage medium and a bus, the storage medium stores program instructions executable by the processor, when the vehicle controller is running, the processor and the storage medium communicate through the bus, and the processor executes the program instructions to perform the steps of the battery cell temperature control method of the electric vehicle according to any one of the first aspect.

[0040] In a fourth aspect, an embodiment of the present application further provides a computer readable storage medium, the storage medium stores a computer program, and the computer program performs the steps of the battery cell temperature control method of the electric vehicle according to any one of the first aspect when executed by a processor.

[0041] The present application has the following beneficial effects:

[0042] The battery cell temperature control method, device, vehicle controller and medium provided by the present application determine the coolant target temperature according to the battery cell state information of the target temperature control mode and the running state information of the electric vehicle, adjust the battery cell temperature by adjusting the coolant target temperature, provide multiple temperature control modes for users to choose from, and realize intelligent adjustment of the battery cell temperature in combination with the vehicle running state and the battery cell state information. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A flowchart illustrating the cell temperature control method for electric vehicles provided in this application embodiment. Figure 1 ;

[0045] Figure 2 A flowchart illustrating the cell temperature control method for electric vehicles provided in this application embodiment. Figure 2 ;

[0046] Figure 3 This is a flowchart of the cell temperature control provided in an embodiment of this application;

[0047] Figure 4 A flowchart for determining cell temperature pre-adjustment provided in an embodiment of this application;

[0048] Figure 5 A flowchart illustrating the cell temperature control method for electric vehicles provided in this application embodiment. Figure 3 ;

[0049] Figure 6 A flowchart for determining the coolant temperature for pre-cooling the battery cell provided in this application embodiment;

[0050] Figure 7 A flowchart for determining the coolant temperature for preheating the battery cell is provided in the embodiments of this application;

[0051] Figure 8 A flowchart illustrating the energy-saving temperature control mode provided in the embodiments of this application;

[0052] Figure 9 A schematic diagram of the structure of a battery cell temperature control device for an electric vehicle provided in an embodiment of this application;

[0053] Figure 10 This is a schematic diagram of a vehicle controller provided in an embodiment of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0055] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0056] In the description of the application, it should be noted that if the terms "upper", "lower", etc. indicate the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the application is used, it is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0057] In addition, the terms "first", "second", etc. in the specification and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0059] At present, new energy vehicles are all equipped with advanced intelligent navigation systems and intelligent driving systems, and people use navigation very frequently when traveling. The present scheme combines navigation information and battery state information to perform thermal management on the battery, so as to save energy to the maximum extent while meeting the driving needs of users.

[0060] Figure 1 Flowchart of the battery temperature control method of the electric vehicle provided for the embodiments of the application Figure 1 As shown in the flowchart of the battery temperature control method of the electric vehicle provided for the embodiments of the application Figure 1 As shown in the flowchart of the battery temperature control method of the electric vehicle provided for the embodiments of the application

[0061] S101, in response to an opening operation of a battery intelligent temperature mode of an electric vehicle and a mode selection operation, determining a target temperature control mode from a plurality of temperature control modes in the battery intelligent temperature mode.

[0062] In the embodiment, the starting or stopping of the battery cell intelligent temperature mode is controlled through the central control screen or control buttons of the electric vehicle. When the battery cell intelligent temperature mode is stopped, the battery cell temperature is controlled by using a fixed heat parameter threshold. When intelligent temperature regulation is needed, the battery cell intelligent temperature mode can be started.

[0063] The battery cell intelligent temperature mode includes multiple temperature control modes, and each temperature control mode adjusts the battery cell temperature in a different way.

[0064] After the user selects to start the battery cell intelligent temperature mode, multiple temperature control modes in the battery cell intelligent temperature mode are provided for the user to select, and the target temperature control mode is determined according to the user's selection.

[0065] S102, obtain battery cell state information and running state information of the electric vehicle matched with the target temperature control mode, and the running state information at least includes a distance value between the electric vehicle and a destination.

[0066] In the embodiment, for different temperature control modes, the battery cell state information used to calculate the target temperature of the cooling liquid is different. The battery cell state information includes the battery cell temperature and / or the remaining battery cell power. Therefore, after the target temperature control mode is determined, the battery cell state information matched with the target temperature control mode needs to be obtained.

[0067] In addition to obtaining the battery cell state information, in order to intelligently adjust the battery cell temperature, the running state information of the electric vehicle also needs to be combined, so that the adjusted battery cell temperature can meet the running requirements of the electric vehicle.

[0068] In some embodiments, the running state information at least includes a distance value between the electric vehicle and a destination. The destination can be a destination input by the user in a navigation system, or can be a preset location automatically selected within a preset range according to the current position of the electric vehicle. The preset location can be, for example, the nearest battery swap station, the nearest highway intersection, etc.

[0069] S103, determine the target temperature of the cooling liquid according to the battery cell state information and the running state information.

[0070] In some embodiments, the calculation rule of the target temperature of the cooling liquid of each temperature control mode is set. The target temperature of the cooling liquid is calculated according to the calculation rule of the target temperature control mode, the battery cell state information, and the distance value between the electric vehicle and the destination.

[0071] In other embodiments, a mapping relationship of the battery cell state information, the running state information, and the target temperature of the cooling liquid of each temperature control mode is set. The matched target temperature of the cooling liquid is determined according to the mapping relationship of the target temperature control mode, the battery cell state information, and the distance value between the electric vehicle and the destination.

[0072] Further, the running state information can further include a running speed of the electric vehicle, and the target temperature of the cooling liquid can be determined according to the cell state information, the distance value and / or the running speed.

[0073] S104, adjusting the cell cooling liquid temperature according to the target temperature of the cooling liquid, to adjust the cell temperature.

[0074] In this embodiment, the cooling liquid temperature is adjusted according to the current temperature of the cooling liquid and the target temperature of the cooling liquid, so that the cooling liquid can adjust the cell temperature.

[0075] In this embodiment, the cooling liquid temperature is adjusted according to the current temperature of the cooling liquid and the target temperature of the cooling liquid, so that the cooling liquid can adjust the cell temperature.

[0076] In some embodiments, adjusting the cooling liquid temperature is adjusting the inlet temperature of the cooling liquid into the cell, which can be achieved by controlling the cooler, heater, water pump and valve and the like.

[0077] The above-mentioned cell temperature control method of the electric vehicle provides a plurality of temperature control modes for users to choose from, and realizes intelligent adjustment of the cell temperature in combination with the vehicle running state and the cell state information.

[0078] In a possible implementation, the target temperature control mode is a non-energy-saving temperature control mode, and the cell state information can include a remaining power of the cell, Figure 2 The above-mentioned cell temperature control method of the electric vehicle provides a plurality of temperature control modes for users to choose from, and realizes intelligent adjustment of the cell temperature in combination with the vehicle running state and the cell state information. Figure 2 As shown in Figure 2 The above-mentioned S103 can include the following steps:

[0079] S201, determining whether to enter the non-energy-saving temperature control mode according to the distance value and the remaining power of the cell.

[0080] In this embodiment, the temperature control mode can include an energy-saving temperature control mode and a non-energy-saving temperature control mode, and after the user selects the non-energy-saving temperature control mode, it is necessary to first determine whether to enter the non-energy-saving temperature control mode to adjust the cell temperature according to the vehicle running state information and the cell state information.

[0081] Specifically, according to the distance value between the electric vehicle and the destination and the remaining power of the battery cell, it is determined whether to enter the non-energy-saving temperature control mode. If the distance value is greater than a preset distance threshold and the remaining power of the battery cell is less than a preset power threshold, in order to avoid that the electric vehicle cannot reach the destination, the non-energy-saving temperature control mode is not entered. If the distance value is less than or equal to a first preset distance threshold or the remaining power of the battery cell is greater than or equal to a first preset power threshold, it is ensured that the electric vehicle can reach the destination, and then the non-energy-saving temperature control mode is entered.

[0082] In some embodiments, Figure 3 The battery cell temperature control flowchart provided in the embodiments of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, first, it is determined whether the user has started the battery cell intelligent temperature mode. If the battery cell intelligent temperature mode has not been started, the battery cell intelligent temperature mode is not entered. If the battery cell intelligent temperature mode has been started, the temperature control mode selected by the user is obtained. If the temperature control mode selected by the user is the non-energy-saving temperature control mode, it is determined whether the distance value is greater than a first distance threshold and the remaining power of the battery cell is less than a preset power threshold. If the distance value is greater than the first distance threshold and the remaining power of the battery cell is less than the preset power threshold, it is determined that the battery cell intelligent temperature mode is not entered. If the distance value is less than or equal to the first distance threshold or the remaining power of the battery cell is greater than or equal to the preset power threshold, the non-energy-saving temperature control mode is entered. In some embodiments, the first distance threshold can be 50 km, and the preset power threshold can be 5%.

[0083] In some embodiments, the destination is a preset charging station, which can be a nearest charging station selected from a navigation system according to the position of the vehicle, or a charging station selected by the user, or a fixed charging station of the user, such as a fixed parking space of the user.

[0084] S202, after determining to enter the non-energy-saving temperature control mode, it is determined whether the battery cell satisfies the temperature pre-adjustment condition.

[0085] In the embodiments, after determining to enter the non-energy-saving temperature control mode, it is further determined whether the battery cell needs to be pre-adjusted in temperature.

[0086] In some embodiments, whether the battery cell satisfies the temperature pre-adjustment condition can be determined according to the running state information of the electric vehicle.

[0087] In some other embodiments, whether the battery cell satisfies the temperature pre-adjustment condition can be determined according to the running state information of the electric vehicle and the state information of the battery cell.

[0088] Further, the temperature pre-adjustment condition can be a pre-heating condition or a pre-cooling condition, and the temperature of the battery cell is pre-heated or pre-cooled to adjust the temperature of the battery cell, so that the temperature of the battery cell can reach an optimal state when the battery cell reaches the destination for charging, thereby shortening the battery fast charging time and improving the fast charging efficiency.

[0089] In S203, if the battery cell meets the temperature pre-adjustment condition, the target temperature of the cooling liquid is determined according to the remaining power of the battery cell.

[0090] In the embodiment, the temperature of the battery cell needs to be pre-adjusted, such as pre-heating or pre-cooling, when the battery cell meets the temperature pre-adjustment condition.

[0091] Specifically, the target temperature of the cooling liquid is determined according to the mapping relationship between the remaining power of the battery cell and the temperature of the cooling liquid, and the temperature of the cooling liquid is heated or cooled according to the target temperature of the cooling liquid, so that the cooling liquid can pre-heat or pre-cool the temperature of the battery cell.

[0092] In some embodiments, if the battery cell meets the pre-heating condition, the smaller the remaining power of the battery cell, the lower the target temperature of the cooling liquid, and the greater the remaining power of the battery cell, the higher the target temperature of the cooling liquid, so that the fastest heating target temperature of the cooling liquid is used when the battery cell heats up in the case of sufficient power, and the optimal temperature of the cooling liquid is lowered in the case of insufficient power.

[0093] In some embodiments, if the battery cell meets the pre-cooling condition, the smaller the remaining power of the battery cell, the higher the target temperature of the cooling liquid, and the greater the remaining power of the battery cell, the lower the target temperature of the cooling liquid, so that the fastest cooling target temperature of the cooling liquid is used when the battery cell cools down in the case of sufficient power, and the optimal temperature of the cooling liquid is raised in the case of insufficient power.

[0094] After the target temperature of the cooling liquid is determined, the target temperature of the cooling liquid is adjusted to adjust the temperature of the battery cell, thereby pre-adjusting the temperature of the battery cell.

[0095] The battery cell temperature control method of the electric vehicle provided in the above embodiments can determine whether to enter the non-energy-saving temperature control mode according to the distance value and the remaining power of the battery cell, so that the electric vehicle can normally travel to the destination; when it is determined to enter the non-energy-saving temperature control mode and the battery cell meets the temperature pre-adjustment condition, the target temperature of the cooling liquid is determined according to the remaining power of the battery cell, and after the target temperature of the cooling liquid is determined, the target temperature of the cooling liquid is adjusted to adjust the temperature of the battery cell, thereby pre-adjusting the temperature of the battery cell, ensuring that the temperature of the battery cell can reach an optimal state when charging, thereby shortening the battery fast charging time and improving the fast charging efficiency.

[0096] In a possible implementation, the non-energy-saving temperature control mode is an automatic temperature control mode, and the battery cell state information further includes a battery cell temperature, and the process of determining whether the battery cell satisfies the temperature pre-adjustment condition in S202 can include:

[0097] According to the distance value and the battery cell temperature, it is determined whether the battery cell satisfies the temperature pre-adjustment condition.

[0098] In this embodiment, the temperature control mode can include an energy-saving temperature control mode and an automatic temperature control mode, as shown in FIG. 2A, if the target temperature control mode selected by the user is the automatic temperature control mode, when the distance value is less than or equal to a first preset distance threshold or the remaining battery capacity of the battery cell is greater than or equal to a first preset capacity threshold, the automatic temperature control mode is entered. Figure 3

[0099] In the automatic temperature control mode, the battery cell temperature needs to be pre-adjusted before the electric vehicle reaches the destination for charging, so that the battery cell temperature when reaching the destination for charging can reach an optimal charging temperature, and the charging efficiency is improved.

[0100] The temperature pre-adjustment performed too early can increase energy consumption, and the temperature pre-adjustment performed too late can cause the battery cell temperature to be insufficient, resulting in a slow charging speed. Therefore, the timing of pre-adjusting the battery cell temperature needs to be determined.

[0101] Specifically, according to whether the distance value is less than a second distance threshold and whether the battery cell temperature satisfies a preset temperature threshold, it is determined whether the battery cell temperature satisfies the temperature pre-adjustment condition.

[0102] If the distance value is less than the second distance threshold and the battery cell temperature satisfies the preset temperature threshold, it is determined that the battery cell temperature satisfies the temperature pre-adjustment condition, and if the distance value is greater than or equal to the second distance threshold and the battery cell temperature does not satisfy the preset temperature threshold, it is determined that the battery cell temperature does not satisfy the temperature pre-adjustment condition.

[0103] In another possible implementation, the non-energy-saving temperature control mode is a default temperature control mode, and the battery cell state information further includes a battery cell temperature, and the process of determining whether the battery cell satisfies the temperature pre-adjustment condition in S202 can include:

[0104] According to the battery cell temperature, it is determined whether the battery cell satisfies the temperature pre-adjustment condition.

[0105] In this embodiment, the temperature control mode can include an energy-saving temperature control mode, an automatic temperature control mode and a default temperature control mode, and the three temperature control modes can be provided as options through the central control screen, or only the energy-saving temperature control mode and the automatic temperature control mode can be provided as options, as shown in FIG. 2B. Figure 3 ​As shown, if the user does not select the energy-saving temperature control mode or the automatic temperature control mode within the preset time length, the target temperature control mode is determined as the default temperature control mode.

[0106] In the default temperature control mode, the battery cell temperature does not need to be pre-adjusted according to the distance value between the electric vehicle and the destination, and only needs to be judged whether temperature pre-adjustment is needed according to the battery cell temperature.

[0107] Specifically, according to whether the battery cell temperature meets the preset temperature threshold, it is determined whether the battery cell temperature meets the temperature pre-adjustment condition.

[0108] In some embodiments, the temperature threshold for preheating and the temperature threshold for precooling are different.

[0109] Further, the precooling temperature threshold can be determined according to the sum of the optimal charging temperature of the battery cell when charging and the first adjustment value, and the preheating temperature threshold can be determined according to the difference between the optimal charging temperature and the second adjustment value. The first adjustment value and the second adjustment value can be set according to requirements, and the present embodiment does not limit this.

[0110] For example, the first adjustment value can be 3°, that is, the precooling temperature threshold = optimal charging temperature A + 3°, and the second adjustment value can be 8°, that is, the preheating temperature threshold = optimal charging temperature A - 8°.

[0111] It should be noted that the optimal charging temperature A is different in the scenario where preheating is needed and the scenario where precooling is needed.

[0112] For example, Figure 4 The judgment flowchart of the battery cell temperature pre-adjustment provided by the present embodiment is as shown in Figure 4 First, it is judged whether the battery cell is in a charging state, if the battery cell is in a charging state, temperature pre-adjustment is not needed, if the battery cell is not in a charging state, it is judged whether to enter the battery cell intelligent temperature mode, for example, it can be determined whether to enter the non-energy-saving temperature control mode according to the distance value and the remaining power of the battery cell as shown in Figure 3

[0113] In the case of determining to enter the non-energy-saving temperature control mode, it is determined whether the user has selected the automatic temperature control mode, if the user has selected the automatic temperature control mode, it is judged whether the distance value to the destination is less than a second distance threshold, if the automatic temperature control mode is not selected, or the distance value to the destination is less than the second distance threshold, it is judged whether the battery cell temperature is greater than the precooling temperature threshold or less than the preheating temperature threshold, if the battery cell temperature is greater than the precooling temperature threshold, it is determined that the battery cell needs precooling treatment, if the battery cell temperature is less than the preheating temperature threshold, it is determined that the battery cell needs preheating treatment.

[0114] ​If the distance value to the destination is greater than or equal to the second distance threshold value, it is determined that the battery cell does not need to be pre-adjusted in temperature; if the battery cell temperature is less than or equal to the pre-cooling temperature threshold value and the battery cell temperature is greater than or equal to the pre-heating temperature threshold value, it is determined that the battery cell temperature has reached the optimal charging temperature, and the battery cell does not need to be pre-adjusted in temperature.

[0115] For example, the second distance threshold value can be 10 km.

[0116] The battery cell temperature control method for an electric vehicle provided in the above embodiments can determine whether the battery cell meets the temperature pre-adjustment condition according to the distance value and the battery cell temperature, or according to the battery cell temperature, to ensure that the temperature of the battery cell before charging can reach the optimal charging temperature, thereby improving the charging efficiency.

[0117] In a possible implementation manner, Figure 5 The flowchart of the battery cell temperature control method for an electric vehicle provided in the embodiments of the present application is shown in Figure 3 As shown in Figure 5 The process of determining the target temperature of the cooling liquid according to the remaining capacity of the battery cell in S203 can include:

[0118] S301, determining the optimal charging temperature of the battery cell according to the ambient temperature.

[0119] S302, determining the optimal temperature of the cooling liquid according to the optimal charging temperature of the battery cell.

[0120] S303, determining the target temperature of the cooling liquid according to the optimal temperature of the cooling liquid and the remaining capacity of the battery cell.

[0121] In the present embodiment, the optimal charging temperature of the battery cell will be different under the influence of the ambient temperature. The temperature sensor provided on the electric vehicle is used to collect the ambient temperature in real time. According to the mapping relationship between the ambient temperature and the optimal charging temperature and the ambient temperature collected in real time, the optimal charging temperature of the battery cell is determined.

[0122] After the optimal charging temperature of the battery cell is determined, it needs to be converted into the optimal temperature of the cooling liquid required for thermal management. The temperature difference between the battery cell temperature and the cooling liquid temperature can be determined according to the heat generation power of the battery cell in the charging process and the thermal resistance value between the battery cell and the cooling liquid. The optimal temperature of the cooling liquid is determined according to the difference between the optimal charging temperature of the battery cell and the temperature difference between the battery cell temperature and the cooling liquid temperature.

[0123] After the optimal temperature of the cooling liquid is determined, in order to better match the state of the battery cell, the optimal temperature of the cooling liquid also needs to be fine-tuned according to the remaining capacity of the battery cell to determine the target temperature of the cooling liquid.

[0124] In some embodiments, the temperature offset corresponding to the remaining charge range of a cell can be determined based on the mapping relationship between the remaining charge range of multiple cells and the temperature offset, and the target temperature of the coolant can be determined based on the optimal temperature of the coolant and the temperature offset.

[0125] Furthermore, Figure 6 A flowchart for determining the coolant temperature for pre-cooling the battery cell, as provided in the embodiments of this application, is shown below. Figure 6 As shown, if the battery cell meets the pre-cooling conditions, the optimal charging temperature A1 of the battery cell is determined based on the ambient temperature. Based on the optimal charging temperature A1 of the battery cell, the optimal temperature B1 of the coolant is determined. Based on the sum of the optimal temperature B1 of the coolant and the temperature deviation, the target temperature of the coolant is determined. When the remaining charge of the battery cell is low, considering the need for energy saving, the coolant temperature cannot be too low. Therefore, the smaller the range of the remaining charge of the battery cell, the larger the temperature deviation.

[0126] For example, if the remaining charge of the battery cell is within the first charge threshold range, the target temperature of the coolant is the optimal coolant temperature B1. If the remaining charge of the battery cell is within the second charge threshold range, the target temperature of the coolant is the optimal coolant temperature B1 + a first offset. If the remaining charge of the battery cell is within the third charge threshold range, the target temperature of the coolant is the optimal coolant temperature B1 + a second offset. If the remaining charge of the battery cell is within the fourth charge threshold range, the target temperature of the coolant is the optimal coolant temperature B1 + a third offset. The first charge threshold range is greater than the second charge threshold range, the second charge threshold range is greater than the third charge threshold range, the third charge threshold range is greater than the fourth charge threshold range, the first offset is less than the second offset, and the second offset is less than the third offset.

[0127] For example, the first power threshold range can be SOC≥20%, the second power threshold range can be 10%≤SOC<20%, ​​the third power threshold range can be 5%≤SOC<10%, and the fourth power threshold range can be SOC<5%.

[0128] Figure 7 A flowchart for determining the coolant temperature for preheating the battery cell provided in this application embodiment is shown below. Figure 7 As shown, if the battery cell meets the preheating conditions, the optimal charging temperature A2 of the battery cell is determined based on the ambient temperature. Based on the optimal charging temperature A2 of the battery cell, the optimal temperature B2 of the coolant is determined. Based on the difference between the optimal temperature B1 of the coolant and the temperature deviation, the target temperature of the coolant is determined. When the remaining charge of the battery cell is low, considering the need for energy saving, the coolant temperature cannot be too high. Therefore, the smaller the range of the remaining charge of the battery cell, the larger the temperature deviation.

[0129] For example, if the remaining charge of the battery cell is within the first charge threshold range, the target temperature of the coolant is the optimal coolant temperature B2. If the remaining charge of the battery cell is within the second charge threshold range, the target temperature of the coolant is the optimal coolant temperature B2 - the fourth offset. If the remaining charge of the battery cell is within the third charge threshold range, the target temperature of the coolant is the optimal coolant temperature B2 - the fifth offset. If the remaining charge of the battery cell is within the fourth charge threshold range, the target temperature of the coolant is the optimal coolant temperature B2 - the sixth offset. The fourth offset is less than the fifth offset, and the fifth offset is less than the sixth offset.

[0130] The battery cell temperature control method for electric vehicles provided in the above embodiments determines the optimal charging temperature of the battery cell based on the ambient temperature, determines the optimal temperature of the coolant based on the optimal charging temperature of the battery cell, and determines the target temperature of the coolant based on the optimal temperature of the coolant and the remaining charge of the battery cell. This method achieves pre-regulation of the battery cell temperature by adjusting the coolant temperature, ensuring that the battery cell reaches the optimal charging temperature during charging and improving charging efficiency.

[0131] In one possible implementation, the temperature control mode is an energy-saving temperature control mode, and the cell status information may include: cell temperature. The process of determining the target coolant temperature based on the cell status information and operating status information in step S103 may include:

[0132] Based on the distance value and the cell temperature, determine the target temperature of the coolant and the target cell heating threshold.

[0133] In this embodiment, the temperature of the electric vehicle in winter affects the discharge power of the battery cells. Therefore, after the vehicle is powered on and started in winter, the battery cells need to be heated to ensure normal vehicle operation. In reality, if the vehicle is driven at low speed or for short distances immediately after being powered on and started, a lower discharge power is sufficient for normal vehicle operation, and the target coolant temperature and battery cell temperature requirements can be appropriately reduced to achieve energy saving. However, if the vehicle needs to travel at high speeds, a higher discharge power is required to ensure high-speed operation, thus necessitating an increase in the target coolant temperature and battery cell temperature requirements.

[0134] Specifically, the distance between the electric vehicle and the preset highway section can be used to determine whether the electric vehicle is about to travel at low or high speed, and the target coolant temperature and target cell heating threshold can be determined in combination with the cell temperature.

[0135] If the distance between the electric vehicle and the preset highway section is large and the battery cell temperature is high, the battery cell discharge power can meet the vehicle's driving needs. This can reduce the target coolant temperature and the target battery cell heating threshold to save energy. If the distance between the electric vehicle and the preset highway section is small, or the battery cell temperature is low, the battery cell discharge power cannot meet the vehicle's driving needs. It is necessary to heat up the battery cell as soon as possible. Therefore, the target coolant temperature and the target battery cell heating threshold can be increased.

[0136] It should be noted that since the battery cell temperature is generally below 0°C when a vehicle starts in winter, the smaller the target battery cell heating threshold, the more difficult it is to meet the battery cell heating requirements; the larger the target battery cell heating threshold, the easier it is to meet the battery cell heating requirements.

[0137] In some embodiments, determining the target coolant temperature and the target cell heating threshold based on the distance value and the cell temperature may include:

[0138] If the distance value is greater than the preset distance threshold and the cell temperature is greater than the preset temperature threshold, the preset coolant temperature and the preset cell heating threshold are reduced, and the target coolant temperature and the target cell heating threshold are determined; if the distance value is less than or equal to the preset distance threshold, or the cell temperature is less than or equal to the preset temperature threshold, the target coolant temperature is determined to be the preset coolant temperature, and the target cell heating threshold is determined to be the preset cell heating threshold.

[0139] In this embodiment, the electric vehicle is pre-set with a preset coolant temperature and a preset battery cell heating threshold. If the distance value is greater than the preset distance threshold and the battery cell temperature is greater than the preset temperature threshold, the target coolant temperature and target battery cell heating threshold can be determined by lowering the preset coolant temperature and the preset battery cell heating threshold. Otherwise, the preset coolant temperature and preset battery cell heating threshold can be kept unchanged.

[0140] Example, Figure 8 A flowchart illustrating the energy-saving temperature control mode provided in the embodiments of this application is shown below. Figure 8 As shown, the system first determines whether the vehicle is powered on. If it is not powered on, the battery cell has no heating requirement. If the vehicle is powered on, the system can determine whether the battery cell meets the heating requirements based on the battery cell temperature. If the battery cell meets the heating requirements, the system determines whether the energy-saving temperature control mode has been selected. If the energy-saving temperature control mode has not been selected, the system determines whether the preset coolant temperature and the preset battery cell heating threshold remain unchanged.

[0141] If the energy-saving temperature control mode is selected, it is determined whether the distance value is greater than the preset distance threshold and whether the cell temperature is greater than the preset temperature threshold. If yes, the preset coolant temperature and preset cell heating threshold are reduced to determine the target coolant temperature and target cell heating threshold. If no, the preset coolant temperature and preset cell heating threshold are kept unchanged.

[0142] For example, the preset distance threshold can be 10km and the preset temperature threshold can be -15°. If the distance value is greater than 10km and the cell temperature is greater than -15°, the target coolant temperature can be determined based on the preset coolant temperature of -8° and the target cell heating threshold can be determined based on the preset cell heating threshold of -5°.

[0143] It should be noted that if the battery cell meets the heating requirements but the user has not selected a temperature control mode, the preset coolant temperature and preset battery cell heating threshold will remain unchanged. If the battery cell does not meet the heating requirements but the user has not selected a temperature control mode, the following will apply: Figure 4 The process shown determines whether the battery cell meets the preheating or precooling conditions.

[0144] Furthermore, since the battery cells need to be cooled in summer to ensure safety, the battery cell cooling does not use an energy-saving temperature control mode.

[0145] In some embodiments, the cell temperature in the above embodiments can be the average temperature of the cell over a preset period of time.

[0146] The battery cell temperature control method for electric vehicles provided in the above embodiments determines the target coolant temperature and the target battery cell heating threshold based on the distance value and the battery cell temperature, so as to ensure that the battery cell temperature can meet the discharge power required for vehicle operation, and saves energy when necessary by adjusting the target coolant temperature and the target battery cell heating threshold.

[0147] Based on the above method embodiments, this application also provides a battery cell temperature control device for electric vehicles. Figure 9 This is a schematic diagram of the structure of the battery cell temperature control device for electric vehicles provided in the embodiments of this application, as shown below. Figure 9 As shown, the device may include:

[0148] The control mode determination module 401 is used to respond to the activation operation of the intelligent temperature mode of the battery cell for electric vehicles and the mode selection operation, and to determine the target temperature control mode from multiple temperature control modes under the intelligent temperature mode of the battery cell.

[0149] The status information acquisition module 402 is used to acquire the cell status information and the electric vehicle operation status information that match the target temperature control mode. The operation status information includes at least the distance value between the electric vehicle and the destination.

[0150] The target temperature determination module 403 is used to determine the target temperature of the coolant based on the cell status information and operating status information;

[0151] Temperature adjustment module 404 is used to adjust the cell coolant temperature according to the target coolant temperature, thereby adjusting the cell temperature.

[0152] Optionally, the target temperature control mode is a non-energy-saving temperature control mode. The cell status information includes: the remaining charge of the cell. The target temperature determination module 403 is specifically used to determine whether to enter the non-energy-saving temperature control mode based on the distance value and the remaining charge of the cell. After determining to enter the non-energy-saving temperature control mode, it is determined whether the cell meets the temperature pre-adjustment conditions. If the cell meets the temperature pre-adjustment conditions, the target temperature of the coolant is determined based on the remaining charge of the cell.

[0153] Optionally, the non-energy-saving temperature control mode is an automatic temperature control mode. The cell status information also includes: cell temperature. The target temperature determination module 403 is also used to determine whether the cell meets the temperature pre-adjustment conditions based on the distance value and the cell temperature.

[0154] Optionally, the non-energy-saving temperature control mode is the default temperature control mode. The cell status information also includes: cell temperature. The target temperature determination module 403 is also used to determine whether the cell meets the temperature pre-adjustment conditions based on the cell temperature.

[0155] Optionally, the target temperature determination module 403 is specifically used to determine the optimal charging temperature of the battery cell based on the ambient temperature; determine the optimal temperature of the coolant based on the optimal charging temperature of the battery cell; and determine the target temperature of the coolant based on the optimal temperature of the coolant and the remaining charge of the battery cell.

[0156] Optionally, the temperature control mode is an energy-saving temperature control mode, and the cell status information includes: cell temperature. The target temperature determination module is also used to determine the target temperature of the coolant and the target cell heating threshold based on the distance value and the cell temperature.

[0157] Optionally, the target temperature determination module 403 is specifically used to determine the target coolant temperature and the target battery cell heating threshold by reducing the preset coolant temperature and the preset battery cell heating threshold if the distance value is greater than the preset distance threshold and the battery cell temperature is greater than the preset temperature threshold; if the distance value is less than or equal to the preset distance threshold, or the battery cell temperature is less than or equal to the preset temperature threshold, the target coolant temperature is determined to be the preset coolant temperature and the target battery cell heating threshold is determined to be the preset battery cell heating threshold.

[0158] The above-described device is used to execute the method provided in the foregoing embodiments, and its implementation principle and technical effect are similar, so they will not be described again here.

[0159] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0160] In some embodiments, this application also provides a battery cell temperature control system for an electric vehicle, which may include: a vehicle controller, a battery cell, a coolant unit, an operating status acquisition unit, and a battery cell status acquisition unit. The operating status acquisition unit is used to acquire vehicle operating status information, and the battery cell status acquisition unit is used to acquire battery cell status information. The operating status acquisition unit and the battery cell status acquisition unit are connected to the vehicle controller, and the vehicle controller is also connected to the coolant unit to control the coolant temperature according to the operating status information and the battery cell status information.

[0161] Figure 10 A schematic diagram of the vehicle controller provided in the embodiments of this application, as shown below. Figure 10 As shown, the vehicle controller 500 may include a processor 501, a storage medium 502, and a bus. The storage medium 502 stores program instructions executable by the processor 501. When the vehicle controller 500 is running, the processor 501 communicates with the storage medium 502 via the bus, and the processor 501 executes the program instructions to perform the above-described method embodiment. The specific implementation and technical effects are similar and will not be described in detail here.

[0162] Optionally, this application also provides a computer-readable storage medium storing a computer program, which is executed by a processor to perform the above-described method embodiments.

[0163] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0164] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0165] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0166] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0167] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of temperature control of an electric core of an electric vehicle, characterized by, The method comprises: in response to an opening operation of a battery cell intelligent temperature mode of an electric vehicle, and a mode selection operation, determining a target temperature control mode from a plurality of temperature control modes in the battery cell intelligent temperature mode; obtaining battery cell state information matched with the target temperature control mode and running state information of the electric vehicle, the running state information at least comprising a distance value between the electric vehicle and a destination; determining a cooling liquid target temperature according to the battery cell state information and the running state information; adjusting a battery cell cooling liquid temperature according to the cooling liquid target temperature to adjust a battery cell temperature; the temperature control mode is an energy-saving temperature control mode, and the battery cell state information comprises a battery cell temperature; the determining of the cooling liquid target temperature according to the battery cell state information and the running state information comprises: determining the cooling liquid target temperature and a target battery cell heating threshold according to the distance value and the battery cell temperature; the determining of the cooling liquid target temperature and the target battery cell heating threshold according to the distance value and the battery cell temperature comprises: if the distance value is greater than a preset distance threshold value, and the battery cell temperature is greater than a preset temperature threshold value, reducing a preset cooling liquid temperature and a preset battery cell heating threshold to determine the cooling liquid target temperature and the target battery cell heating threshold; if the distance value is less than or equal to the preset distance threshold value, or the battery cell temperature is less than or equal to the preset temperature threshold value, determining the cooling liquid target temperature as the preset cooling liquid temperature, and the target battery cell heating threshold as the preset battery cell heating threshold.

2. The method of claim 1, wherein, the target temperature control mode is a non-energy-saving temperature control mode, and the battery cell state information comprises a battery cell remaining capacity; the determining of the cooling liquid target temperature according to the battery cell state information and the running state information comprises: determining whether to enter the non-energy-saving temperature control mode according to the distance value and the battery cell remaining capacity; after determining to enter the non-energy-saving temperature control mode, judging whether a battery cell satisfies a temperature pre-adjustment condition; if the battery cell satisfies the temperature pre-adjustment condition, determining the cooling liquid target temperature according to the battery cell remaining capacity.

3. The method of claim 2, wherein, the non-energy-saving temperature control mode is an automatic temperature control mode, and the battery cell state information further comprises a battery cell temperature; the judging of whether the battery cell satisfies the temperature pre-adjustment condition comprises: judging whether the battery cell satisfies the temperature pre-adjustment condition according to the distance value and the battery cell temperature.

4. The method of claim 2, wherein, the non-energy-saving temperature control mode is a default temperature control mode, and the battery cell state information further comprises a battery cell temperature; the judging of whether the battery cell satisfies the temperature pre-adjustment condition comprises: judging whether the battery cell satisfies the temperature pre-adjustment condition according to the battery cell temperature.

5. The method of claim 2, wherein, the determining of the cooling liquid target temperature according to the battery cell remaining capacity comprises: determining a battery cell optimal charging temperature according to an ambient temperature; determining a cooling liquid optimal temperature according to the battery cell optimal charging temperature; determining the cooling liquid target temperature according to the cooling liquid optimal temperature and the battery cell remaining capacity.

6. An electric core temperature control device of an electric vehicle, characterized by comprising: The device comprises: The control mode determining module is configured to determine a target temperature control mode from a plurality of temperature control modes in an electric core intelligent temperature mode of an electric vehicle in response to an opening operation of the electric core intelligent temperature mode and a mode selection operation. The state information obtaining module is configured to obtain electric core state information matched with the target temperature control mode and running state information of the electric vehicle, the running state information at least including a distance value between the electric vehicle and a destination. The target temperature determining module is configured to determine a cooling liquid target temperature according to the electric core state information and the running state information. The temperature adjusting module is configured to adjust an electric core cooling liquid temperature according to the cooling liquid target temperature to adjust an electric core temperature. The temperature control mode is an energy-saving temperature control mode, the electric core state information includes an electric core temperature, and the target temperature determining module is further configured to determine the cooling liquid target temperature and a target electric core heating threshold according to the distance value and the electric core temperature. The target temperature determining module is specifically configured to: if the distance value is greater than a preset distance threshold and the electric core temperature is greater than a preset temperature threshold, reduce a preset cooling liquid temperature and a preset electric core heating threshold to determine the cooling liquid target temperature and the target electric core heating threshold; and if the distance value is less than or equal to the preset distance threshold or the electric core temperature is less than or equal to the preset temperature threshold, determine the cooling liquid target temperature as the preset cooling liquid temperature and the target electric core heating threshold as the preset electric core heating threshold.

7. A vehicle controller characterized by comprising: The method comprises: A processor, a storage medium and a bus, the storage medium stores program instructions executable by the processor, when the vehicle controller is running, the processor and the storage medium communicate through the bus, the processor executes the program instructions to execute the steps of the electric core temperature control method of the electric vehicle as claimed in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is executed by the processor to execute the steps of the electric core temperature control method of the electric vehicle as claimed in any one of claims 1 to 5.

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