Heating method and device of vehicle power battery and storage medium

Abstract

The invention provides a heating method and device of a vehicle power battery and a storage medium, and belongs to the technical field of battery management. The method comprises the steps that the preset discharge power of a power battery is inquired in a discharge mapping table of the power battery based on the temperature and the remaining capacity of the power battery of the vehicle, and the discharge mapping table is used for recording the preset discharge power of the power battery under different temperatures and remaining capacities; the actual discharge power of the power battery and the target discharge power of the vehicle are obtained, wherein the target discharge power is at least the discharge power to be reached when the vehicle accelerates; and heating the power battery under the condition that the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power meets the heating condition. According to the technical scheme, a battery heating strategy on the power dimension is provided, the power requirement of the vehicle can be met, meanwhile, heating energy consumption is reduced, and the endurance of the vehicle in the low-temperature environment is improved.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a heating method, device and storage medium for a vehicle power battery. Background Art

[0002] As the main power source for new energy vehicles, the material properties of power batteries will result in low discharge power of power batteries in low temperature environments. In low temperature environments, in order to meet the power needs of the vehicle, battery heating is usually turned on to increase the discharge power of the power battery by increasing the temperature of the power battery. However, due to the large number of heating conditions for the entire vehicle in low temperature environments, such as air conditioning heating and seat heating, power consumption is high, thus affecting battery life. Therefore, how to formulate a reasonable and necessary power battery heating strategy to meet the power needs of the vehicle while reducing unnecessary heating losses, thereby improving the battery life, is a technical problem that needs to be solved. Summary of the invention

[0003] The embodiment of the present application provides a method, device and storage medium for heating a vehicle power battery, which can reduce the battery heating energy consumption while meeting the power demand of the vehicle, and improve the vehicle's endurance in a low temperature environment. The technical solution is as follows:

[0004] In one aspect, a method for heating a vehicle power battery is provided, the method comprising:

[0005] Based on the temperature and the remaining power of the power battery of the vehicle, querying the preset discharge power of the power battery in a discharge mapping table of the power battery, wherein the discharge mapping table is used to record the preset discharge power of the power battery at different temperatures and remaining power;

[0006] Acquiring an actual discharge power of the power battery and a target discharge power of the vehicle, wherein the target discharge power is a discharge power that the vehicle must at least reach when accelerating;

[0007] When the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies a heating condition, the power battery is heated.

[0008] In another aspect, a heating device for a vehicle power battery is provided, the device comprising:

[0009] A query module, configured to query a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and the remaining power of the power battery of the vehicle, wherein the discharge mapping table is configured to record the preset discharge power of the power battery at different temperatures and remaining power;

[0010] An acquisition module, used to acquire the actual discharge power of the power battery and the target discharge power of the vehicle, wherein the target discharge power is the discharge power that the vehicle must at least reach when accelerating;

[0011] The heating module is used to heat the power battery when the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power meets a heating condition.

[0012] In some embodiments, the query module is used to obtain the preset discharge power under the temperature and the remaining power when the temperature and the remaining power exist in the discharge mapping table; when the temperature or the remaining power does not exist in the discharge mapping table, based on at least one of the temperature interval where the temperature is located and the power interval where the remaining power is located, interpolate at least one preset discharge power in the discharge mapping table to obtain the preset discharge power of the power battery.

[0013] In some embodiments, a plurality of temperature sensors are installed on the power battery of the vehicle, and the plurality of temperature sensors are used to collect the temperature at different positions of the power battery;

[0014] The query module is used to query a first discharge power in the discharge mapping table based on the highest temperature collected by the multiple temperature sensors and the remaining power of the power battery; query a second discharge power in the discharge mapping table based on the lowest temperature collected by the multiple temperature sensors and the remaining power of the power battery; and use the smaller discharge power between the first discharge power and the second discharge power as the preset discharge power of the power battery.

[0015] In some embodiments, the query module is further used to update the preset discharge power of the power battery based on the health factor of the power battery.

[0016] In some embodiments, the acquisition module is used to detect the actual discharge power of the power battery; and determine the target discharge power corresponding to the vehicle speed based on the current vehicle speed.

[0017] In some embodiments, the heating module is used to send a heating request to a vehicle controller of the vehicle, and the vehicle controller is used to turn on the heating device of the power battery in response to the heating request.

[0018] In some embodiments, the heating condition is that the target discharge power is not less than the preset discharge power, and the preset discharge power is not less than the actual discharge power.

[0019] In some embodiments, the heating module is also used to heat the power battery if the relationship between the preset discharge power, the actual discharge power and the target discharge power meets the heating conditions, when the operating state of the vehicle is a preset state; wherein the preset state includes at least one of the following: the remaining power of the power battery is greater than the first power; the temperature of the power battery is less than the first temperature; if the vehicle is in a preset operating condition, the duration of the vehicle in the preset operating condition is less than the preset duration, and the preset operating condition includes a parking condition and an idling condition.

[0020] In some embodiments, the heating module is further used to stop heating the power battery if the relationship between the preset discharge power, the actual discharge power and the target discharge power meets a stop heating condition during the heating of the power battery.

[0021] In some embodiments, the heating stop condition includes any one of the following: the target discharge power is less than the actual discharge power, and the actual discharge power is less than the preset discharge power; the temperature of the power battery is greater than a second temperature; and the remaining power of the power battery is less than a second power.

[0022] On the other hand, a computer-readable storage medium is provided, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor to implement the vehicle power battery heating method in an embodiment of the present application.

[0023] On the other hand, a computer program product is provided, including a computer program, wherein the computer program is executed by a processor to implement the vehicle power battery heating method in the embodiment of the present application.

[0024] The embodiment of the present application provides a method for heating a vehicle power battery, which can obtain the preset discharge power of the power battery in the current operating state by looking up a table according to the temperature and remaining power of the vehicle's power battery; then determine whether to heat the power battery by comparing the preset discharge power of the power battery, the actual discharge power, and the target discharge power that meets the acceleration power requirement. The above method provides a battery heating strategy in the power dimension. Compared with simply determining whether to heat the power battery based on temperature, it can reduce many unnecessary heating scenarios. For example, even in a low temperature environment, if the actual discharge power of the power battery has met the acceleration power requirement of the vehicle, there is no need to heat the power battery. Therefore, the above method can reduce heating energy consumption while meeting the power requirements of the vehicle, thereby improving the vehicle's endurance in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic diagram of an implementation environment of a vehicle power battery heating method provided according to an embodiment of the present application;

[0027] Figure 2 is a flow chart of a method for heating a vehicle power battery provided according to an embodiment of the present application;

[0028] Figure 3 is a flow chart of another method for heating a vehicle power battery provided according to an embodiment of the present application;

[0029] Figure 4 It is a block diagram of a heating device for a vehicle power battery provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0031] In this application, the terms "first", "second", etc. are used to distinguish identical or similar items with basically the same effects and functions. It should be understood that there is no logical or temporal dependency between "first", "second", and "nth", nor is there any limitation on quantity and execution order.

[0032] In the present application, the term "at least one" means one or more, and the term "plurality" means two or more.

[0033] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0034] Figure 1 is a schematic diagram of an implementation environment of a vehicle power battery heating method provided in accordance with an embodiment of the present application, see Figure 1The implementation environment includes: a battery management system 101, a power battery 102, a vehicle controller 103 and a heating device 104. The battery management system 101 and the vehicle controller 103 communicate with each other via a CAN (Controller Area Network) bus.

[0035] The battery management system 101 is used to detect the temperature, remaining power, and discharge power of the power battery 102. The battery management system 101 is also used to query the preset discharge power of the power battery 102 from the discharge mapping table according to the temperature and remaining power of the power battery 102. The battery management system 101 is also used to obtain the current speed of the vehicle by obtaining data transmitted on the CAN bus, and then determine the target discharge power to be achieved at least when accelerating at the current speed.

[0036] The power battery 102 is the core module that provides power for the vehicle and is used to store and output electrical energy. The working conditions of the power battery 102, such as temperature, remaining power, and discharge power, are monitored and regulated by the battery management system 101 to ensure that the vehicle can operate safely and efficiently.

[0037] The vehicle controller 103 is a control module of the vehicle, which is used to receive control requests from multiple modules such as the battery management system 101, and coordinate and control other modules of the vehicle according to the control requests. For example, in the power battery heating scenario, the battery management system 101 can send a heating request to the vehicle controller 103 to instruct the vehicle controller 103 to control the heating device 104 to turn on, thereby heating the power battery 102.

[0038] The heating device 104 is used to heat the power battery 102. The heating device 104 is usually arranged around the power battery 102. After the heating device 104 starts working, it can directly heat the power battery 102 through the heat it emits, and can also heat the conductive medium through the heat it emits, and then indirectly heat the power battery 102 through the conductive medium, thereby increasing the temperature of the power battery 102, ensuring that the power battery 102 can maintain a good discharge power in a low temperature environment, and ensuring the power performance and endurance of the vehicle.

[0039] Figure 2 is a flow chart of a method for heating a vehicle power battery according to an embodiment of the present application, such as Figure 2 As shown, taking the method being executed by a battery management system of a vehicle as an example, the method includes the following steps:

[0040] 201. The battery management system queries a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and remaining power of the power battery of the vehicle.

[0041] In an embodiment of the present application, a battery management system (BMS) can detect the temperature and remaining power of the vehicle's power battery in real time. The battery management system can also query the preset discharge power of the power battery in a discharge mapping table according to the detected temperature and remaining power. The discharge mapping table can also be called a discharge map table, which is used to record the preset discharge power of the power battery under different working conditions, that is, the preset discharge power of the power battery under different temperatures and remaining power.

[0042] Optionally, the discharge mapping table is a data table, which records the discharge characteristics of the power battery under various operating conditions in a tabular format, such as a preset discharge power. The preset discharge power of the power battery under various operating conditions can be obtained by conducting a large number of experiments on the power battery. For example, the discharge mapping table can be an M*N table, in which the preset discharge power of the power battery at different temperatures and remaining power is recorded according to a certain temperature interval and a certain percentage interval. The temperature interval can be 5°C, 10°C, etc., and the percentage interval can also be 5%, 10%, etc., which is not limited in the embodiment of the present application.

[0043] 202. The battery management system obtains the actual discharge power of the power battery and the target discharge power of the vehicle, where the target discharge power is the minimum discharge power to be achieved when the vehicle accelerates.

[0044] In the embodiment of the present application, the battery management system can also monitor the actual discharge power of the power battery. In addition, as a node on the CAN bus, the battery management system can also obtain signals transmitted on the CAN bus, such as acceleration signals, vehicle speed signals, etc., to determine the discharge power that the vehicle must reach at least when accelerating based on the obtained signals, that is, the target discharge power. For example, the acceleration requirements corresponding to the acceleration signal of the vehicle include but are not limited to 0-50km / h (kilometers per hour), 0-100km / h, etc., and different acceleration requirements correspond to different target discharge powers.

[0045] Optionally, the battery management system can also obtain the current speed of the vehicle based on the vehicle speed signal. The battery management system usually stores the correspondence between the vehicle speed and the target discharge power. Accordingly, after the battery management system obtains the vehicle speed, it determines the target discharge power corresponding to the vehicle speed. The target discharge power is the discharge power that must be achieved at least when accelerating at the current vehicle speed.

[0046] 203. When the relationship among the preset discharge power, the actual discharge power and the target discharge power meets the heating condition, the battery management system heats the power battery to increase the actual discharge power of the power battery.

[0047] In the embodiment of the present application, the battery management system determines whether to heat the power battery according to the relationship between the preset discharge power, the actual discharge power and the target discharge power. For example, when the target discharge power is greater than the preset discharge power and the preset discharge power is greater than the actual discharge power, it indicates that the current discharge power of the power battery cannot meet the power demand of vehicle acceleration, and the discharge power of the power battery still has room for improvement. Therefore, the battery management system heats the power battery to increase the actual discharge power of the power battery by increasing the temperature of the power battery, thereby meeting the power demand of the vehicle.

[0048] The embodiment of the present application provides a method for heating a vehicle power battery, which can obtain the preset discharge power of the power battery in the current operating state by looking up a table according to the temperature and remaining power of the vehicle's power battery; then determine whether to heat the power battery by comparing the preset discharge power of the power battery, the actual discharge power, and the target discharge power that meets the acceleration power requirement. The above method provides a battery heating strategy in the power dimension. Compared with simply determining whether to heat the power battery based on temperature, it can reduce many unnecessary heating scenarios. For example, even in a low temperature environment, if the actual discharge power of the power battery has met the acceleration power requirement of the vehicle, there is no need to heat the power battery. Therefore, the above method can reduce heating energy consumption while meeting the power requirements of the vehicle, thereby improving the vehicle's endurance in a low temperature environment.

[0049] Figure 3 is a flow chart of another method for heating a vehicle power battery provided in accordance with an embodiment of the present application, such as Figure 3 As shown, taking the method being executed by a battery management system of a vehicle as an example, the method includes the following steps:

[0050] 301. The battery management system queries a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and remaining power of the power battery of the vehicle.

[0051] In an embodiment of the present application, the battery management system can read the temperature and remaining power of the vehicle's power battery. The remaining power can also be called SOC (States of Charge), which can reflect the percentage of power currently remaining in the power battery. The discharge mapping table is used to record the preset discharge power of the power battery at different temperatures and remaining power. The discharge mapping table can be a data table, and the storage format of the discharge mapping table is not limited in the embodiment of the present application.

[0052] The following describes the process of the battery management system querying the preset power in the discharge mapping table.

[0053] In some embodiments, after the battery management system obtains the temperature and the remaining power of the power battery, the battery management system queries whether the temperature and the remaining power exist in the discharge mapping table. If the temperature and the remaining power exist in the discharge mapping table, the battery management system reads the preset discharge power under the temperature and the remaining power in the discharge mapping table. If the temperature or the remaining power does not exist in the discharge mapping table, the battery management system interpolates at least one preset discharge power in the discharge mapping table according to at least one of the temperature interval where the temperature is located and the power interval where the remaining power is located, to obtain the preset discharge power of the power battery. By means of table lookup and interpolation, the preset discharge power of the power battery under the current working condition can be obtained more accurately and quickly.

[0054] For example, the discharge mapping table records the preset discharge power of the power battery at different temperatures and remaining power according to the temperature interval of 5°C and the percentage interval of 5%. If the temperature of the power battery is -5°C and the remaining power is 20%, the battery management system determines the discharge power in the column (or row) of -5°C and the row (or column) of 20% in the discharge mapping table as the preset discharge power of the power battery. If the temperature of the power battery is -5°C and the remaining power is 17%, the battery management system linearly interpolates the two discharge powers in the column (or row) of -5°C and the rows (or columns) of 15% and 20% in the discharge mapping table to obtain the preset discharge power of the power battery.

[0055] In some embodiments, a plurality of temperature sensors are installed on the power battery of the vehicle, and the plurality of temperature sensors are used to collect the temperature at different positions of the power battery. Accordingly, the battery management system can read the temperature collected by the plurality of temperature sensors and determine the highest and lowest temperatures therefrom. Then, the battery management system queries the first discharge power in the discharge mapping table according to the highest temperature and the remaining power of the power battery; and queries the second discharge power in the discharge mapping table according to the lowest temperature and the remaining power of the power battery. Then, the battery management system uses the smaller discharge power of the first discharge power and the second discharge power as the preset discharge power of the power battery. Since the temperature at different positions of the power battery may be different, the actual temperature condition of the battery can be more comprehensively considered by respectively querying the first discharge power and the second discharge power according to the highest temperature and the lowest temperature. In addition, by using a smaller discharge power as the preset discharge power of the power battery, power abuse can be prevented, and the power battery can be prevented from continuously outputting a higher discharge power, thereby improving the endurance of the power battery.

[0056] 302. The battery management system updates the preset discharge power of the power battery based on the health factor of the power battery.

[0057] In an embodiment of the present application, after the battery management system obtains the preset discharge power of the power battery by looking up the table, it multiplies the preset discharge power by the health factor of the power battery to obtain an updated preset discharge power. Among them, the health factor is an important indicator for measuring the health of the battery or the degree of performance degradation, which can intuitively reflect the health and life of the battery. The health factor can also be called SOH (State of Health), which can reflect the relative relationship between the current performance state of the power battery and the performance state of the power battery in a brand new state. Among them, the value range of the health factor is usually 0%-100%.

[0058] By updating the preset discharge power obtained by looking up the table according to the health factor of the power battery, the performance degradation of the power battery as the use time increases can be taken into account, thereby improving the accuracy of determining the preset discharge power.

[0059] 303. The battery management system obtains the actual discharge power of the power battery and the target discharge power of the vehicle, where the target discharge power is the minimum discharge power to be achieved when the vehicle accelerates.

[0060] In the embodiment of the present application, the battery management system can detect the actual discharge power of the power battery. In addition, the battery management system can also obtain signals transmitted on the CAN bus, such as acceleration signals, vehicle speed signals, etc., and then determine the discharge power that the vehicle must reach at least when accelerating based on the obtained signals, that is, the target discharge power. For example, the acceleration requirements corresponding to the acceleration signal of the vehicle include but are not limited to 0-50km / h (kilometers per hour), 0-100km / h, etc., and different acceleration requirements correspond to different target discharge powers.

[0061] Optionally, the battery management system can also obtain the current speed of the vehicle based on the vehicle speed signal. The battery management system usually stores the correspondence between the vehicle speed and the target discharge power. Accordingly, after the battery management system obtains the vehicle speed, it determines the target discharge power corresponding to the vehicle speed. The target discharge power is the discharge power that must be achieved at least when accelerating at the current vehicle speed.

[0062] It should be noted that the embodiment of the present application does not limit the execution order of steps 301-303. In some embodiments, the battery management system can first execute step 303, and then execute steps 301-302; or the battery management system can also first execute steps 301 and 303, and then execute step 302, which is not limited by the embodiment of the present application.

[0063] 304. When the relationship between the preset discharge power, the actual discharge power and the target discharge power meets the heating conditions, the battery management system sends a heating request to the vehicle controller of the vehicle, and the vehicle controller is used to turn on the heating device of the power battery in response to the heating request to heat the power battery.

[0064] In an embodiment of the present application, the battery management system determines whether to heat the power battery according to the relationship between the preset discharge power, the actual discharge power and the target discharge power. When the relationship between the above powers meets the heating conditions, the battery management system sends a heating request to the vehicle controller (VCU, Vehicle Control Unit). In response to the heater request, the vehicle controller controls the heating device of the power battery to turn on. Among them, the heating device can be a PTC (a thermistor). After the heating device is turned on, it can directly heat the power battery through the heat emitted by itself, and it can also heat the conductive medium through the heat emitted by itself, and then indirectly heat the power battery through the conductive medium. The conductive medium can be circulating water, which is not limited in the embodiment of the present application. Heating the power battery by the heating device can increase the temperature of the power battery, ensure that the power battery can maintain a good discharge power even in a low temperature environment, and thus ensure the power performance and endurance of the vehicle.

[0065] In some embodiments, the heating condition is that the target discharge power is not less than the preset discharge power, and the preset discharge power is not less than the actual discharge power. Among them, the target discharge power is the discharge power determined according to the vehicle speed, and the preset discharge power is the discharge power obtained by looking up the table. When the preset discharge power is not less than the actual discharge power, it indicates that there is still room for improvement in the discharge power of the power battery. When the target discharge power is not less than the preset discharge power, it indicates that the discharge power of the power battery under the current temperature and the remaining power can no longer meet the acceleration power requirements of the vehicle. Therefore, it is necessary to heat the power battery to increase the discharge power of the power battery, thereby ensuring the driving acceleration power.

[0066] In some embodiments, in order to consider some extreme operating conditions, the judgment logic of power battery heating can be additionally added to refine the power battery heating strategy as much as possible. If the relationship between the preset discharge power, the actual discharge power and the target discharge power meets the heating condition, the battery management system heats the power battery when the vehicle's operating state is the preset state. The preset state includes at least one of the following: (1) The remaining power of the power battery is greater than the first power. The first power can be set according to actual needs. By heating the power battery when the remaining power of the power battery is greater than the first power, it is possible to avoid turning on the power battery heating when the remaining power is low, thereby reducing the heating power loss in low-range scenarios and improving the vehicle's range. (2) The temperature of the power battery is lower than the first temperature. The first temperature can be set according to actual needs. By heating the power battery when the temperature of the power battery is lower than the first temperature, it is possible to ensure that the power battery heating is turned on only in a low-temperature environment, and it is also possible to reduce some of the power battery heating scenarios and improve the vehicle's range. (3) If the vehicle is in a preset operating condition, the duration of the vehicle being in the preset operating condition is less than the preset duration, and the preset operating condition includes the parking condition and the idling condition. For example, when the duration of the vehicle being in the P gear (parking condition) or the duration of the vehicle's speed being 0 (idling condition) is less than 10 minutes, it indicates that the vehicle is in a short stop state, such as waiting for a traffic light, and the power battery heating can be turned on at this time. By turning on the battery heating only when the vehicle is in the preset operating condition for a short period of time, it is possible to avoid heating the power battery when the vehicle is in the preset operating condition for a long time, thereby reducing unnecessary heating losses and improving the battery life.

[0067] 305. During the process of heating the power battery, if the operating state of the vehicle meets the conditions for stopping heating, the battery management system stops heating the power battery.

[0068] In the embodiment of the present application, during the heating process of the power battery, the battery management system can also monitor the operating status of the vehicle in real time by reading the signal transmitted on the CAN bus. If the operating status of the vehicle meets the conditions for stopping heating, the battery management system sends a stop heating request to the vehicle controller. In response to the stop heating request, the vehicle controller controls the heating device of the power battery to turn off, thereby stopping heating the power battery.

[0069] In some embodiments, the conditions for stopping heating include any of the following: (1) the target discharge power is less than the actual discharge power, and the actual discharge power is less than the preset discharge power. When the target discharge power is less than the actual discharge power, it indicates that the current discharge power of the power battery can already meet the acceleration power requirement of the vehicle. Therefore, there is no need to heat the power battery, and the power battery can be stopped from being heated in time to reduce heating losses and ensure the endurance of the power battery. (2) The temperature of the power battery is greater than the second temperature. By stopping the heating of the power battery when the temperature of the power battery is greater than the second temperature, it can be ensured that the heating of the power battery is stopped in time when leaving the low temperature environment, thereby reducing heating losses and improving the endurance of the power battery. (3) The remaining power of the power battery is less than the second power. By stopping the heating of the power battery when the remaining power of the power battery is low, the heating loss in the low endurance scenario can be reduced, thereby improving the endurance of the vehicle.

[0070] It should also be noted that when the remaining power of the power battery is less than the third power level, in addition to being unable to turn on the power battery heating, other PTC heating functions of the vehicle, such as air conditioning heating and seat heating, cannot be turned on, so as to further ensure the vehicle's endurance. The second power level and the third power level can be set according to actual needs, for example, the second power level is 5% and the third power level is 3%.

[0071] In order to further verify the energy savings and improved endurance achieved by the power battery heating method provided in the embodiment of the present application, a comparative experiment was conducted between this method and the traditional method of simply formulating a heating strategy based on temperature. In the traditional method, the heating of the power battery is turned on when the temperature of the power battery is less than -10°C, and the heating of the power battery is turned off when the temperature is higher than -5°C. In the comparative test, the following three operating conditions were used for testing: (1) the vehicle was discharged from full charge to the point where it could not be driven; (2) the vehicle's air conditioner was turned on in mid-gear; (3) the vehicle speed was 85-100, and the vehicle was loaded with 4 sandbags. Table 1 below shows the experimental results of the comparative experiment.

[0072] Table 1

[0073]

[0074] It can be seen from Table 1 above that in the two heating methods, the vehicle charging process remains consistent, the starting temperature and the ending temperature remain basically consistent under the driving discharge condition, the initial remaining power remains consistent and is discharged to a state where it cannot be driven. By comparison, compared with the traditional heating method, the discharge capacity of the power battery heating method provided in the embodiment of the present application is higher, the power loss is reduced by 2.4KWh (kilowatt-hours), and the power used for cruising is also increased by 2.26kWh, and the overall cruising range is increased by 12.8km (kilometers). It can be seen that the heating method of the power battery provided in the embodiment of the present application can effectively reduce the heating loss and improve the vehicle cruising range while ensuring the driving power.

[0075] The embodiment of the present application provides a method for heating a vehicle power battery, which can obtain the preset discharge power of the power battery in the current operating state by looking up a table according to the temperature and remaining power of the vehicle's power battery; then determine whether to heat the power battery by comparing the preset discharge power of the power battery, the actual discharge power, and the target discharge power that meets the acceleration power requirement. The above method provides a battery heating strategy in the power dimension. Compared with simply determining whether to heat the power battery based on temperature, it can reduce many unnecessary heating scenarios. For example, even in a low temperature environment, if the actual discharge power of the power battery has met the acceleration power requirement of the vehicle, there is no need to heat the power battery. Therefore, the above method can reduce heating energy consumption while meeting the power requirements of the vehicle, thereby improving the vehicle's endurance in a low temperature environment.

[0076] Figure 4 is a block diagram of a heating device for a vehicle power battery provided according to an embodiment of the present application. The device is used to execute the steps of the above-mentioned vehicle power battery heating method, such as Figure 4 As shown, the heating device of the vehicle power battery includes: a query module 401 , an acquisition module 402 and a heating module 403 .

[0077] A query module 401 is used to query a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and remaining power of the power battery of the vehicle, where the discharge mapping table is used to record the preset discharge power of the power battery at different temperatures and remaining power;

[0078] An acquisition module 402 is used to acquire the actual discharge power of the power battery and the target discharge power of the vehicle, where the target discharge power is the discharge power that the vehicle must at least reach when accelerating;

[0079] The heating module 403 is used to heat the power battery when the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power meets the heating condition.

[0080] In some embodiments, the query module 401 is used to obtain the preset discharge power under the temperature and the remaining power when the temperature and the remaining power exist in the discharge mapping table; when the temperature or the remaining power does not exist in the discharge mapping table, at least one preset discharge power in the discharge mapping table is interpolated based on at least one of the temperature interval in which the temperature is located and the power interval in which the remaining power is located, to obtain the preset discharge power of the power battery.

[0081] In some embodiments, a plurality of temperature sensors are installed on the power battery of the vehicle, and the plurality of temperature sensors are used to collect the temperature at different positions of the power battery;

[0082] The query module 401 is used to query a first discharge power in a discharge mapping table based on the highest temperature collected by multiple temperature sensors and the remaining power of the power battery; query a second discharge power in the discharge mapping table based on the lowest temperature collected by multiple temperature sensors and the remaining power of the power battery; and use the smaller discharge power between the first discharge power and the second discharge power as the preset discharge power of the power battery.

[0083] In some embodiments, the query module 401 is further used to update the preset discharge power of the power battery based on the health factor of the power battery.

[0084] In some embodiments, the acquisition module 402 is used to detect the actual discharge power of the power battery; based on the current speed of the vehicle, determine the target discharge power corresponding to the speed.

[0085] In some embodiments, the heating module 403 is used to send a heating request to a vehicle controller of the vehicle, and the vehicle controller is used to turn on the heating device of the power battery in response to the heating request.

[0086] In some embodiments, the heating condition is that the target discharge power is not less than the preset discharge power, and the preset discharge power is not less than the actual discharge power.

[0087] In some embodiments, the heating module 403 is also used to heat the power battery if the relationship between the preset discharge power, the actual discharge power and the target discharge power meets the heating conditions, when the operating state of the vehicle is a preset state; wherein the preset state includes at least one of the following: the remaining power of the power battery is greater than the first power; the temperature of the power battery is less than the first temperature; if the vehicle is in a preset operating condition, the time the vehicle is in the preset operating condition is less than the preset time, and the preset operating condition includes a parking condition and an idling condition.

[0088] In some embodiments, the heating module 403 is further configured to stop heating the power battery if the relationship between the preset discharge power, the actual discharge power and the target discharge power satisfies a stop heating condition during the heating of the power battery.

[0089] In some embodiments, the heating stop condition includes any one of the following: the target discharge power is less than the actual discharge power, and the actual discharge power is less than the preset discharge power; the temperature of the power battery is greater than the second temperature; the remaining power of the power battery is less than the second power.

[0090] The embodiment of the present application provides a heating device for a vehicle power battery, which can obtain the preset discharge power of the power battery in the current operating state by looking up a table according to the temperature and remaining power of the vehicle's power battery; then determine whether to heat the power battery by comparing the preset discharge power of the power battery, the actual discharge power, and the target discharge power that meets the acceleration power requirement. The above method provides a battery heating strategy in the power dimension. Compared with simply determining whether to heat the power battery based on temperature, it can reduce many unnecessary heating scenarios. For example, even in a low temperature environment, if the actual discharge power of the power battery has met the acceleration power requirement of the vehicle, there is no need to heat the power battery. Therefore, the above method can reduce heating energy consumption while meeting the power requirements of the vehicle, thereby improving the vehicle's endurance in a low temperature environment.

[0091] It should be noted that: the heating device for the vehicle power battery provided in the above embodiment only uses the division of the above functional modules as an example to illustrate when realizing its functions. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the terminal is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and the implementation process thereof is shown in the method embodiment, which will not be repeated here.

[0092] In an exemplary embodiment, a computer-readable storage medium is also provided, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor to implement the vehicle power battery heating method in the above embodiment.

[0093] In an exemplary embodiment, a computer program product is also provided, including a computer program, which is executed by a processor to implement the vehicle power battery heating method in the embodiment of the present application.

[0094] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for heating a vehicle power battery, characterized in that: The method comprises: Based on the temperature and the remaining power of the power battery of the vehicle, querying the preset discharge power of the power battery in a discharge mapping table of the power battery, wherein the discharge mapping table is used to record the preset discharge power of the power battery at different temperatures and remaining power; Acquiring an actual discharge power of the power battery and a target discharge power of the vehicle, wherein the target discharge power is a discharge power that the vehicle must at least reach when accelerating; When the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies a heating condition, the power battery is heated.

2. The method according to claim 1, characterized in that: The step of querying a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and the remaining power of the power battery of the vehicle includes: When the temperature and the remaining power are present in the discharge mapping table, obtaining a preset discharge power under the temperature and the remaining power; When the temperature or the remaining power does not exist in the discharge mapping table, at least one preset discharge power in the discharge mapping table is interpolated based on at least one of the temperature interval in which the temperature is located and the power interval in which the remaining power is located to obtain the preset discharge power of the power battery.

3. The method according to claim 1, characterized in that A plurality of temperature sensors are installed on the power battery of the vehicle, and the plurality of temperature sensors are used to collect the temperature at different positions of the power battery; The process of querying the preset discharge power of the power battery includes: Based on the highest temperature collected by the multiple temperature sensors and the remaining power of the power battery, querying a first discharge power in the discharge mapping table; Based on the lowest temperature collected by the multiple temperature sensors and the remaining power of the power battery, querying the second discharge power in the discharge mapping table; The smaller discharge power between the first discharge power and the second discharge power is used as the preset discharge power of the power battery.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Based on the health factor of the power battery, the preset discharge power of the power battery is updated.

5. The method according to claim 1, characterized in that The obtaining the actual discharge power of the power battery and the target discharge power of the vehicle includes: Detecting the actual discharge power of the power battery; Based on the current vehicle speed of the vehicle, a target discharge power corresponding to the vehicle speed is determined.

6. The method according to claim 1, characterized in that The step of heating the power battery comprises: A heating request is sent to a vehicle controller of the vehicle, and the vehicle controller is used to turn on the heating device of the power battery in response to the heating request.

7. The method according to claim 1, characterized in that The heating condition is that the target discharge power is not less than the preset discharge power, and the preset discharge power is not less than the actual discharge power.

8. The method according to claim 1, characterized in that: The method further comprises: If the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies a heating condition, heating the power battery when the running state of the vehicle is a preset state; Among them, the preset state includes at least one of the following: the remaining power of the power battery is greater than the first power; the temperature of the power battery is lower than the first temperature; if the vehicle is in a preset operating condition, the time the vehicle is in the preset operating condition is less than the preset time, and the preset operating condition includes a parking condition and an idling condition.

9. The method according to claim 1, characterized in that: The method further comprises: During the process of heating the power battery, if the running state of the vehicle meets a heating stop condition, heating the power battery is stopped.

10. The method according to claim 9, characterized in that The heating stop condition includes any one of the following: The target discharge power is less than the actual discharge power, and the actual discharge power is less than the preset discharge power; The temperature of the power battery is greater than a second temperature; The remaining power of the power battery is less than the second power.

11. A heating device for a vehicle power battery, characterized in that: The device comprises: A query module, configured to query a preset discharge power of the power battery in a discharge mapping table of the power battery based on the temperature and the remaining power of the power battery of the vehicle, wherein the discharge mapping table is configured to record the preset discharge power of the power battery at different temperatures and remaining power; An acquisition module, used to acquire the actual discharge power of the power battery and the target discharge power of the vehicle, wherein the target discharge power is the discharge power that the vehicle must at least reach when accelerating; The heating module is used to heat the power battery when the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power meets a heating condition.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store at least one computer program, and the at least one computer program is used to execute the vehicle power battery heating method according to any one of claims 1 to 10.

Images