Low-temperature driving heating method for power battery system, electronic equipment and storage medium

Abstract

The present application provides a method, electronic device, and storage medium for heating a power battery system during low-temperature driving. The method comprises: obtaining the initial state of charge of the power battery system when the vehicle is started, and determining a detected state of charge corresponding to the initial state of charge based on a first preset relationship; obtaining the real-time state of charge of the power battery system during driving, obtaining the minimum temperature of the battery system when the real-time state of charge reaches the detected state of charge, and heating the power battery system based on the minimum temperature of the battery system. The present application can comprehensively consider the temperature and state of charge of the power battery system to determine whether the power battery system needs to be heated, effectively improving the power performance and economy of the power battery system under low-temperature driving conditions and avoiding users' mileage anxiety.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a method for heating a power battery system during low-temperature operation, an electronic device, and a storage medium. Background Art

[0002] Under low temperature conditions, due to the reduced activity of the electrolyte, the discharge capacity of the power battery system of electric vehicles is significantly reduced. At the same time, the internal resistance increases sharply, reducing the thermal efficiency of discharge, resulting in the power and discharge capacity of the power battery system being lower than that at normal temperature, poor low-temperature power performance, and serious reduction in driving range.

[0003] Driving heating is a function that heats the power battery system itself through self-discharge, accelerating the temperature rise. However, current driving heating generally uses fixed thresholds for heating on and off, considering only the electric vehicle's power performance during low-temperature driving, without considering its economic efficiency in low-temperature driving conditions. This can lead to energy waste due to improper driving heating, which can reduce the electric vehicle's driving range and fail to meet user needs. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a low-temperature driving heating method for a power battery system, an electronic device and a storage medium, so as to comprehensively consider the temperature and charge state of the power battery system, and then determine whether the power battery system needs to be heated, thereby effectively improving the power performance and economy of the power battery system under low-temperature driving conditions and avoiding users' mileage anxiety.

[0005] The present application provides a method for heating a power battery system during low-temperature operation, comprising:

[0006] When the vehicle is started, obtaining an initial state of charge of the power battery system, and determining a detected state of charge corresponding to the initial state of charge according to a first preset relationship;

[0007] The real-time state of charge of the power battery system during driving is obtained, and when the real-time state of charge reaches the detected state of charge, the minimum temperature of the battery system is obtained, and the power battery system is heated according to the minimum temperature of the battery system.

[0008] Optionally, heating the power battery system according to the lowest temperature of the battery system includes:

[0009] determining a heating state of charge corresponding to the lowest temperature of the battery system according to a second preset relationship; wherein the heating state of charge is not greater than the detection state of charge;

[0010] When the real-time state of charge reaches the heating state of charge, the power battery system is heated.

[0011] Optionally, before heating the power battery system according to the lowest temperature of the battery system, the method further includes:

[0012] When the lowest temperature of the battery system is lower than a first temperature threshold, an operation of heating the power battery system according to the lowest temperature of the battery system is triggered.

[0013] Optionally, after heating the power battery system, the method further includes:

[0014] Obtain the real-time temperature of the battery system during the heating process;

[0015] When the real-time temperature of the battery system is not less than a second temperature threshold, heating of the power battery system is stopped.

[0016] Optionally, the first preset relationship and the second preset relationship are obtained based on a heating and discharging driving test performed on other vehicles; the heating and discharging driving test includes:

[0017] The other vehicles are tested according to a preset starting state of charge, a preset ending state of charge, and a preset heating state of charge to obtain a running discharge amount, a heating discharge amount, and a battery temperature change.

[0018] Optionally, the testing of the other vehicle according to a preset starting state of charge, a preset ending state of charge, and a preset heating state of charge to obtain the running discharge amount, the heating discharge amount, and the battery temperature change includes:

[0019] controlling the other vehicle to start driving from the preset initial state of charge and obtaining an initial battery temperature;

[0020] When the real-time state of charge of the other vehicle reaches the preset heating state of charge, heating the power battery system of the other vehicle;

[0021] Controlling the other vehicle to travel until the real-time state of charge reaches the preset end state of charge, obtaining a running discharge amount and a heating discharge amount during the driving process, and obtaining an end battery temperature;

[0022] A battery temperature change is determined according to the starting battery temperature and the ending battery temperature.

[0023] Optionally, determining the detected state of charge corresponding to the initial state of charge according to the first preset relationship includes:

[0024] According to the initial state of charge, determining a state of charge interval corresponding to the initial state of charge as a state of charge interval to be matched;

[0025] When the state-of-charge interval to be matched is the lowest state-of-charge interval, determining the initial state-of-charge to be a detection state-of-charge;

[0026] When the state-of-charge interval to be matched is another state-of-charge interval, the state-of-charge corresponding to the other state-of-charge interval is determined to be the detection state-of-charge; wherein the state-of-charge interval includes a minimum state-of-charge interval and at least one other state-of-charge interval.

[0027] Optionally, determining the heating state of charge corresponding to the lowest temperature of the battery system according to the second preset relationship includes:

[0028] According to the initial state of charge, determining a state of charge interval corresponding to the initial state of charge as a state of charge interval to be matched;

[0029] According to the minimum temperature of the battery system, determining a temperature interval corresponding to the minimum temperature of the battery system as a temperature interval to be matched;

[0030] The state of charge to be selected that matches the state of charge interval to be matched and the temperature interval to be matched is used as the heating state of charge.

[0031] An embodiment of the present application further provides an electronic device, comprising:

[0032] processor and memory;

[0033] The processor is used to execute the steps of the low-temperature driving heating method for the power battery system described in any embodiment of the present application by calling the program or instruction stored in the memory.

[0034] An embodiment of the present application further provides a computer-readable storage medium, which stores a program or instruction, and the program or instruction enables a computer to execute the steps of the low-temperature driving heating method for a power battery system as described in any embodiment.

[0035] In summary, the present application proposes a method for heating a power battery system during low-temperature driving. When the vehicle is started, the initial state of charge of the power battery system is obtained, and a detection state of charge corresponding to the initial state of charge is determined according to a first preset relationship to determine when to start the heating detection. Then, the real-time state of charge of the power battery system during driving is obtained. When the real-time state of charge reaches the detection state of charge, the minimum temperature of the battery system is obtained, and the power battery system is heated according to the minimum temperature of the battery system. This realizes the comprehensive consideration of the temperature and state of charge of the power battery system to heat the power battery system, effectively improving the power performance and economy of the power battery system under low-temperature driving conditions, and avoiding the user's mileage anxiety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a method for heating a power battery system during low-temperature driving provided by an embodiment of the present application;

[0037] Figure 2 This is a flow chart of another method for heating a power battery system during low-temperature driving provided by an embodiment of the present application;

[0038] Figure 3 This is a flow chart of another method for heating a power battery system during low-temperature driving provided by an embodiment of the present application;

[0039] Figure 4 This is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Figure 1 This is a flow chart of a method for heating a power battery system at low temperature during driving provided by an embodiment of the present application. Low temperature driving heating refers to heating the power battery system in cold weather (temperature below -10°C) to heat the power battery system to a suitable temperature, effectively improving the vehicle's endurance in cold conditions. Figure 1 The low-temperature driving heating method of the power battery system specifically includes:

[0043] S110 . When the vehicle is started, obtain an initial state of charge of the power battery system, and determine a detected state of charge corresponding to the initial state of charge according to a first preset relationship.

[0044] The vehicle may be a vehicle in which a power battery system within the vehicle is to be heated using a power battery system low-temperature driving heating method. The power battery system may provide propulsion and other electrical power for the vehicle. The initial state of charge may be the state of charge of the power battery system when the vehicle is started, i.e., the remaining power. The first preset relationship may be a corresponding relationship or a functional relationship, etc., for determining the detected state of charge corresponding to the initial state of charge. The detected state of charge may be the state of charge determined by the first preset relationship, which is used to trigger the subsequent temperature detection and heating determination process.

[0045] Specifically, when the vehicle is started, the state of charge of the power battery system, i.e., the initial state of charge, can be obtained through the battery management system, etc. Then, the initial state of charge is processed according to the first preset relationship, and the processed state of charge is used as the detected state of charge.

[0046] For example, if the first preset relationship is a corresponding relationship, the state of charge corresponding to the initial state of charge can be used as the detected state of charge according to the corresponding relationship. If the first preset relationship is a functional relationship, the initial state of charge can be input into the functional relationship and the output result can be used as the detected state of charge.

[0047] S120: Acquire a real-time state of charge of the power battery system during driving, acquire a minimum temperature of the battery system when the real-time state of charge reaches a detected state of charge, and heat the power battery system according to the minimum temperature of the battery system.

[0048] The real-time state of charge may be the state of charge of the power battery system obtained in real time or at a preset time interval. The minimum temperature of the battery system may be the lowest value among the temperatures detected at various parts of the power battery system.

[0049] Specifically, the state of charge of the power battery system can be obtained in real time or periodically during driving as the real-time state of charge. Then, the real-time state of charge is compared with the detected state of charge. If the detected state of charge is not reached, the process returns to the step of obtaining the real-time state of charge. If the detected state of charge is reached, the temperature of each part of the power battery system can be obtained by the temperature measuring device on the power battery, and the lowest temperature value is used as the minimum temperature of the battery system. Furthermore, when the minimum temperature of the battery system meets certain conditions, the power battery system can be heated to increase the temperature of the power battery system, enhance driving power, and avoid the problem of power waste caused by premature heating.

[0050] Based on the above example, before heating the power battery system according to the minimum temperature of the battery system, a detection step of determining whether to start heating the power battery system may be performed according to the first temperature threshold. Specifically, the detection step may be:

[0051] When the lowest temperature of the battery system is lower than the first temperature threshold, an operation of heating the power battery system according to the lowest temperature of the battery system is triggered.

[0052] The first temperature threshold may be a preset trigger temperature for starting heating of the power battery system.

[0053] Specifically, if the minimum temperature of the battery system is not less than the first temperature threshold, it indicates that the current temperature of the power battery system can meet the use requirements of the power battery system and no heating is required. In addition, there is no need to perform the subsequent operation of heating the power battery system based on the minimum temperature of the battery system. If the minimum temperature of the battery system is less than the first temperature threshold, it indicates that the power battery system may need to be heated to increase the temperature to improve the power effect of the battery. In this case, the operation of heating the power battery system based on the minimum temperature of the battery system can be triggered to further determine whether to heat the power battery system.

[0054] Based on the above example, after the power battery system is heated, it is also possible to determine whether to stop heating the power battery system according to the second temperature threshold. Specifically, it may be:

[0055] Acquire the real-time temperature of the battery system during the heating process; and stop heating the power battery system when the real-time temperature of the battery system is not less than a second temperature threshold.

[0056] The real-time battery system temperature may be the temperature of the power battery system in real time or acquired at preset time intervals. If the power battery system temperature includes multiple sub-temperatures, the real-time battery system temperature may be the lowest value or average value of the multiple sub-temperatures, etc., and the specific value may be determined based on actual needs. The second temperature threshold may be a pre-set trigger temperature for stopping heating of the power battery system.

[0057] Specifically, during the heating process of the power battery system, the real-time temperature of the power battery system can be obtained in real time or periodically. The real-time temperature of the battery system is then compared with a second temperature threshold. If the real-time temperature is less than the second temperature threshold, it indicates that the temperature of the power battery system is still relatively low and heating can continue. If the real-time temperature is not less than the second temperature threshold, it indicates that the temperature of the power battery system is sufficient for use. To ensure that the power battery system's power is sufficient for subsequent driving, heating of the power battery system can be stopped.

[0058] The low-temperature driving heating method for a power battery system provided in an embodiment of the present application obtains an initial state of charge of the power battery system when the vehicle is started, and determines a detected state of charge corresponding to the initial state of charge based on a first preset relationship to determine when to start the heating detection, and then obtains the real-time state of charge of the power battery system during driving. When the real-time state of charge reaches the detected state of charge, the minimum temperature of the battery system is obtained, and the power battery system is heated according to the minimum temperature of the battery system. This achieves comprehensive consideration of the temperature and state of charge of the power battery system to heat the power battery system, effectively improving the power performance and economy of the power battery system under low-temperature driving conditions, and avoiding users' mileage anxiety.

[0059] Figure 2 This is a flow chart of another method for heating a power battery system at low temperature during driving provided by an embodiment of the present application. Based on the above embodiments, the process of determining the state of charge corresponding to the initial state of charge and the process of heating the power battery system according to the minimum temperature of the battery system are exemplified. Figure 2 The low-temperature driving heating method of the power battery system specifically includes:

[0060] S210: When the vehicle is started, obtain the initial state of charge of the power battery system.

[0061] S220 : Determine, according to the initial state of charge, a state of charge interval corresponding to the initial state of charge as a state of charge interval to be matched.

[0062] The SOC interval includes a minimum SOC interval and at least one other SOC interval. It is understood that the SOC is divided into multiple SOC intervals, with the lowest SOC interval being the minimum SOC interval and the other SOC intervals being the other SOC intervals. The SOC interval to be matched is the SOC interval corresponding to the starting SOC.

[0063] Specifically, after obtaining the initial state of charge, the state of charge interval into which the initial state of charge falls is determined, and then the state of charge interval is used as the state of charge interval to be matched.

[0064] Exemplarily, the state of charge intervals may be [90%, 100%], [80%, 90%], [40%, 80%], and [0%, 40%], where [0%, 40%] is the lowest state of charge interval, and [90%, 100%], [80%, 90%], and [40%, 80%] are other state of charge intervals.

[0065] S230: If the SOC interval to be matched is the lowest SOC interval, determine the starting SOC as the detection SOC; if the SOC interval to be matched is another SOC interval, determine the SOC corresponding to the another SOC interval as the detection SOC.

[0066] Specifically, depending on the SOC range to be matched, the detection SOC can be determined in different ways. If the SOC range to be matched is the lowest SOC range, the starting SOC is determined as the detection SOC. If the SOC range to be matched is another SOC range, then based on a pre-set correspondence, the SOC corresponding to the other SOC range is determined as the detection SOC.

[0067] For example, based on the above example, if the state of charge interval to be matched is the lowest state of charge interval [0%, 40%], then the detected state of charge is the starting state of charge. If the state of charge interval to be matched is other state of charge intervals (40%, 80%], then the detected state of charge is 40%. If the state of charge interval to be matched is other state of charge intervals (80%, 90%], then the detected state of charge is 35%. If the state of charge interval to be matched is other state of charge intervals (90%, 100%], then the detected state of charge is 30%.

[0068] S240: Obtain the real-time state of charge of the power battery system during driving, and when the real-time state of charge reaches the detected state of charge, obtain the minimum temperature of the battery system.

[0069] S250: Determine a heating state of charge corresponding to the lowest temperature of the battery system according to a second preset relationship.

[0070] The heating SOC is not greater than the detection SOC. The second preset relationship may be a corresponding relationship or a functional relationship, etc., used to determine the heating SOC corresponding to the lowest temperature of the battery system. The heating SOC may be the SOC determined by the second preset relationship and used to trigger the subsequent power battery system heating process.

[0071] Specifically, the lowest temperature of the battery system is processed according to the second preset relationship, and the state of charge obtained by the processing is used as the heating state of charge.

[0072] For example, if the second preset relationship is a corresponding relationship, the state of charge corresponding to the lowest temperature of the battery system can be used as the heating state of charge based on the corresponding relationship. If the second preset relationship is a functional relationship, the lowest temperature of the battery system can be input into the functional relationship, and the output result can be used as the heating state of charge.

[0073] Based on the above example, the heating state of charge corresponding to the lowest temperature of the battery system may be determined according to the second preset relationship in the following manner:

[0074] According to the starting state of charge, the state of charge interval corresponding to the starting state of charge is determined as the state of charge interval to be matched; according to the minimum temperature of the battery system, the temperature interval corresponding to the minimum temperature of the battery system is determined as the temperature interval to be matched; and the state of charge to be selected that matches the state of charge interval to be matched and the temperature interval to be matched is used as the heating state of charge.

[0075] The temperature range to be matched is a temperature range corresponding to the lowest temperature of the battery system, and the state of charge to be selected may be a state of charge corresponding to both the state of charge range to be matched and the temperature range to be matched.

[0076] Specifically, the state-of-charge range within which the initial state of charge falls is determined, and this state-of-charge range is then used as the state-of-charge range to be matched. The temperature range within which the minimum temperature of the battery system falls is determined, and this temperature range is then used as the temperature range to be matched. Furthermore, using the state-of-charge range to be matched and the temperature range to be matched as the matching items, a predetermined corresponding relationship is used to determine a state-of-charge to be selected that corresponds to the two matching items, and this state-of-charge to be selected is used as the heating state-of-charge.

[0077] Exemplarily, Table 1 shows the correspondence between the state of charge range to be matched, the temperature range to be matched, and the state of charge to be selected.

[0078] Table 1

[0079]

[0080] As shown in Table 1, the columns represent the state of charge intervals to be matched, the rows represent the temperature intervals to be matched, and each element in the table represents the state of charge to be selected. For example, the state of charge interval to be matched corresponding to the initial state of charge of 85% is (80%, 90%], the detected state of charge is 35%, and when the real-time state of charge reaches the detected state of charge of 35%, the lowest temperature of the battery system is 5°C, and the corresponding temperature interval to be matched is (0°C, 15°C]. Furthermore, according to the state of charge interval to be matched (80%, 90%] and the temperature interval to be matched (0°C, 15°C), a search in Table 1 can determine that the state of charge to be selected is 10%, that is, the heating state of charge is 10%.

[0081] S260: When the real-time state of charge reaches a heating state of charge, heating the power battery system.

[0082] Based on the above example, the first preset relationship and the second preset relationship are obtained based on a heating and discharging driving test performed on other vehicles, wherein the heating and discharging driving test includes:

[0083] According to the preset starting state of charge, the preset ending state of charge, and the preset heating state of charge, other vehicles are tested to obtain the running discharge amount, heating discharge amount, and battery temperature change.

[0084] Among them, the other vehicles may be vehicles used for heating and discharge driving tests. The preset starting state of charge may be a preset state of charge when the other vehicles start, which may be understood as the state of charge at the start of the test. The preset ending state of charge may be a preset state of charge when the other vehicles stop moving, which may be understood as the state of charge at the end of the test. The preset heating state of charge may be a preset state of charge when heating the power battery system of the other vehicles. The driving discharge amount may be the amount of electricity consumed by the other vehicles during driving during the test. The heating discharge amount may be the amount of electricity consumed by the other vehicles for heating the power battery system during the test. The battery temperature change may include the temperature of the power battery system of the other vehicles at the start of the test and the temperature of the power battery system of the other vehicles at the end of the test.

[0085] Specifically, other vehicles are tested according to a preset starting state of charge, a preset ending state of charge, and a preset heating state of charge, so that the other vehicles start at the preset starting state of charge, heat the power battery system at the preset heating state of charge, and stop at the preset ending state of charge, and obtain and record the driving discharge amount, heating discharge amount, and battery temperature changes during the entire test process.

[0086] Based on the above example, the following steps can be used to test other vehicles based on the preset starting state of charge, the preset ending state of charge, and the preset heating state of charge to obtain the running discharge amount, heating discharge amount, and battery temperature change:

[0087] Step 1: Control other vehicles to start driving from a preset initial state of charge and obtain an initial battery temperature.

[0088] Step 2: When the real-time state of charge of the other vehicles reaches a preset heating state of charge, the power battery system of the other vehicles is heated.

[0089] Step 3: Control other vehicles to travel until the real-time state of charge reaches the preset end state of charge, obtain the driving discharge amount and heating discharge amount during the driving process, and obtain the end battery temperature.

[0090] Step 4: Determine the battery temperature change based on the starting battery temperature and the ending battery temperature.

[0091] For example, some results of the heating discharge driving test are shown in Table 2.

[0092] Table 2

[0093]

[0094] It is understandable that the first preset relationship and the second preset relationship can be determined by quantitatively analyzing the results of the heating and discharge driving test, for example, through function fitting, model training, etc.

[0095] The embodiment of the present application provides a method for heating a power battery system during low-temperature driving. When the vehicle is started, the initial state of charge (SOC) of the power battery system is obtained. Based on the initial SOC, a SOC interval corresponding to the initial SOC is determined as a to-be-matched SOC interval. If the to-be-matched SOC interval is a minimum SOC interval, the initial SOC is determined as a detection SOC. If the to-be-matched SOC interval is another SOC interval, the SOC corresponding to the other SOC interval is determined as a detection SOC. The real-time SOC of the power battery system is obtained during driving. When the real-time SOC reaches the detection SOC, the minimum temperature of the battery system is obtained. Furthermore, based on a second preset relationship, a heating SOC corresponding to the minimum temperature of the battery system is determined. Furthermore, when the real-time SOC reaches the heating SOC, the power battery system is heated. This method triggers different operations based on the detection SOC and the heating SOC, comprehensively considers the temperature and SOC of the power battery system, and fully utilizes electrical energy during short or long-distance low-temperature driving, thereby improving the efficiency of electrical energy utilization in the power battery system.

[0096] Figure 3 This is a flow chart of another method for heating a power battery system at low temperature during driving provided by an embodiment of the present application. Figure 3 The low-temperature driving heating method of the power battery system specifically includes:

[0097] At the beginning of driving, the current state of charge (initial state of charge) of the power battery system is obtained, and the state of charge of the power battery system for turning on temperature detection is determined by looking up a table, etc., that is, the detected state of charge is determined. Determine whether the state of charge for turning on temperature detection is reached. If not, the judgment process ends. If reached, the minimum temperature Tmin of the battery system is obtained, and the state of charge of the power battery system for turning on driving heating is further determined by looking up a table, etc., that is, the heating state of charge is determined. Determine whether Tmin is greater than 15°C (the first temperature threshold). If so, the driving heating function is not turned on. If not, the driving heating function is turned on when the state of charge for turning on driving heating is reached. Further, when the exit heating condition is reached, the driving heating is stopped. Among them, the exit heating condition can be that Tmin is greater than or equal to 20°C (the second temperature threshold) or the vehicle is powered off.

[0098] It is understandable that the above method can be used in both short-distance and long-distance driving scenarios, thereby maximizing the use of the power battery system's charge and ensuring driving range in low-temperature conditions. This avoids premature activation of the driving heating function during short-distance driving, which uses precious energy to heat the battery. Upon arrival at the destination, the power battery system temperature rises, requiring the battery to be powered down, resulting in energy waste.

[0099] The low-temperature driving heating method for a power battery system provided in the embodiment of the present application comprehensively considers the current state of charge of the power battery system and the minimum temperature of the battery system, and makes an independent judgment to determine whether driving heating is required. This can effectively improve the power economy of the power battery system under low-temperature driving conditions and fully alleviate the user's mileage anxiety during the last kilometer of driving.

[0100] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 4 As shown, the electronic device 400 includes one or more processors 401 and a memory 402 .

[0101] The processor 401 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.

[0102] The memory 402 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 401 may run the program instructions to implement the low-temperature driving heating method for the power battery system of any embodiment of the present application described above and / or other desired functions. Various contents such as initial external parameters, thresholds, etc. may also be stored in the computer-readable storage medium.

[0103] In one example, electronic device 400 may further include an input device 403 and an output device 404, which are interconnected via a bus system and / or other connection mechanisms (not shown). Input device 403 may include, for example, a keyboard, a mouse, etc. Output device 404 may output various information to the outside, including warning information, braking force, etc. Output device 404 may include, for example, a display, a speaker, a printer, a communication network, and remote output devices connected thereto.

[0104] Of course, to simplify, Figure 4 Only some of the components related to the present application in the electronic device 400 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device 400 may further include any other appropriate components according to specific application scenarios.

[0105] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the low-temperature driving heating method for a power battery system provided in any embodiment of the present application.

[0106] The computer program product may be written in any combination of one or more programming languages ​​to implement the program code for performing the operations of the embodiments of the present application, including object-oriented programming languages ​​such as Java, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0107] In addition, an embodiment of the present application may also be a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the processor executes the steps of the low-temperature driving heating method for a power battery system provided in any embodiment of the present application.

[0108] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or 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 thereof.

[0109] It should be noted that the terms used in this application are only for describing specific embodiments and are not intended to limit the scope of this application. As shown in the specification and claims of this application, unless the context clearly indicates an exception, the words "one", "an", "a kind of" and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements.

[0110] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0111] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A method for heating a power battery system during low-temperature operation, characterized in that: include: When the vehicle is started, obtaining an initial state of charge of the power battery system, and determining a detected state of charge corresponding to the initial state of charge according to a first preset relationship; obtaining a real-time state of charge of the power battery system during driving, obtaining a minimum temperature of the battery system when the real-time state of charge reaches the detected state of charge, and heating the power battery system according to the minimum temperature of the battery system; The heating of the power battery system according to the lowest temperature of the battery system includes: determining a heating state of charge corresponding to the lowest temperature of the battery system according to a second preset relationship; wherein the heating state of charge is not greater than the detection state of charge; When the real-time state of charge reaches the heating state of charge, the power battery system is heated.

2. The method according to claim 1, characterized in that Before heating the power battery system according to the lowest temperature of the battery system, the method further includes: When the lowest temperature of the battery system is lower than a first temperature threshold, an operation of heating the power battery system according to the lowest temperature of the battery system is triggered.

3. The method according to claim 1, characterized in that After heating the power battery system, the method further includes: Obtain the real-time temperature of the battery system during the heating process; When the real-time temperature of the battery system is not less than a second temperature threshold, heating of the power battery system is stopped.

4. The method according to claim 1, wherein The first preset relationship and the second preset relationship are obtained based on a heating and discharging driving test performed on other vehicles; The heating discharge driving test includes: The other vehicles are tested according to a preset starting state of charge, a preset ending state of charge, and a preset heating state of charge to obtain a running discharge amount, a heating discharge amount, and a battery temperature change.

5. The method according to claim 4, characterized in that The testing of the other vehicles according to the preset starting state of charge, the preset ending state of charge, and the preset heating state of charge to obtain the running discharge amount, the heating discharge amount, and the battery temperature change includes: controlling the other vehicle to start driving from the preset initial state of charge and obtaining an initial battery temperature; When the real-time state of charge of the other vehicle reaches the preset heating state of charge, heating the power battery system of the other vehicle; Controlling the other vehicle to travel until the real-time state of charge reaches the preset end state of charge, obtaining a running discharge amount and a heating discharge amount during the driving process, and obtaining an end battery temperature; A battery temperature change is determined according to the starting battery temperature and the ending battery temperature.

6. The method according to claim 1, characterized in that The determining, according to the first preset relationship, a detected state of charge corresponding to the initial state of charge includes: According to the initial state of charge, determining a state of charge interval corresponding to the initial state of charge as a state of charge interval to be matched; When the state-of-charge interval to be matched is the lowest state-of-charge interval, determining the initial state-of-charge to be a detection state-of-charge; When the state-of-charge interval to be matched is another state-of-charge interval, the state-of-charge corresponding to the other state-of-charge interval is determined to be the detection state-of-charge; wherein the state-of-charge interval includes a minimum state-of-charge interval and at least one other state-of-charge interval.

7. The method according to claim 1, characterized in that The determining, based on the second preset relationship, the heating state of charge corresponding to the lowest temperature of the battery system includes: According to the initial state of charge, determining a state of charge interval corresponding to the initial state of charge as a state of charge interval to be matched; According to the minimum temperature of the battery system, determining a temperature interval corresponding to the minimum temperature of the battery system as a temperature interval to be matched; The state of charge to be selected that matches the state of charge interval to be matched and the temperature interval to be matched is used as the heating state of charge.

8. An electronic device, characterized in that: The electronic device comprises: processor and memory; The processor is configured to execute the steps of the low-temperature driving heating method for a power battery system as claimed in any one of claims 1 to 7 by calling the program or instructions stored in the memory.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program or instruction, which enables a computer to execute the steps of the low-temperature driving heating method for a power battery system according to any one of claims 1 to 7.

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