Heating method and device for vehicle power battery and storage medium

Abstract

The application 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 following steps: querying a preset discharge power of a power battery in a discharge mapping table of the power battery based on a temperature and a residual capacity of the power battery, the discharge mapping table being used for recording the preset discharge power of the power battery under different temperatures and residual capacities; acquiring an actual discharge power of the power battery and a target discharge power of the vehicle, the target discharge power being a discharge power that is at least required to be reached when the vehicle accelerates; and heating the power battery in the case that a size relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies a heating condition. The technical solution provides a battery heating strategy in the power dimension, which can meet the power demand of the vehicle while reducing the heating energy consumption and improving the endurance of the vehicle in a low-temperature environment.

Description

TECHNICAL FIELD

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

[0002] As the main power source of new energy vehicles, the material characteristics of power batteries can cause the discharge power of power batteries to be low in a low-temperature environment. In a low-temperature environment, in order to meet the power demand of the vehicle, the battery heating is usually started to increase the discharge power of the power battery by increasing the temperature of the power battery. However, due to the fact that there are many vehicle heating working conditions in a low-temperature environment, such as air conditioning heating, seat heating, etc., the power consumption is high, thereby affecting the battery endurance. Therefore, how to formulate a reasonable and necessary power battery heating strategy to meet the power demand of the vehicle while reducing unnecessary heating loss and thereby improving the endurance of the power battery is a technical problem to be solved. SUMMARY

[0003] The embodiments of the present application provide a heating method and device for a vehicle power battery and a storage medium, which can meet the power demand of the vehicle while reducing the battery heating energy consumption and improving the endurance of the vehicle in a low-temperature environment. The technical solution is as follows:

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

[0005] 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, the discharge mapping table being used to record the preset discharge power of the power battery at different temperatures and remaining powers;

[0006] obtaining an actual discharge power of the power battery and a target discharge power of the vehicle, the target discharge power being at least a discharge power to be reached when the vehicle accelerates;

[0007] heating the power battery in a case where the size relationship among the preset discharge power, the actual discharge power and the target discharge power meets a heating condition.

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

[0009] a querying 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, the discharge mapping table being used to record the preset discharge power of the power battery at different temperatures and remaining powers;

[0010] The acquisition module is configured to acquire an actual discharge power of the power battery and a target discharge power of the vehicle, the target discharge power being at least a discharge power to be reached when the vehicle accelerates.

[0011] The heating module is configured to heat the power battery when a size 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 configured to, when the temperature and the remaining capacity exist in the discharge mapping table, acquire a preset discharge power at the temperature and the remaining capacity; and when the temperature or the remaining capacity does not exist in the discharge mapping table, interpolate at least one preset discharge power in the discharge mapping table based on at least one of a temperature interval in which the temperature is located and a capacity interval in which the remaining capacity is located, 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 configured to collect temperatures at different positions of the power battery.

[0014] The query module is configured to query a first discharge power in the discharge mapping table based on a highest temperature collected by the plurality of temperature sensors and a remaining capacity of the power battery, query a second discharge power in the discharge mapping table based on a lowest temperature collected by the plurality of temperature sensors and the remaining capacity of the power battery, and take a 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 configured to update the preset discharge power of the power battery based on a health coefficient of the power battery.

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

[0017] In some embodiments, the heating module is configured to send a heating request to a vehicle controller of the vehicle, and the vehicle controller is configured to start a 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 further configured to, if the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies a heating condition, heat the power battery when the operating state of the vehicle is a preset state; the preset state includes at least one of the following: the remaining power of the power battery is greater than a first power; the temperature of the power battery is less than a first temperature; if the vehicle is in a preset working condition, the vehicle is in the preset working condition for a time period less than a preset time period, and the preset working condition includes a parking working condition and an idling working condition.

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

[0021] In some embodiments, the stop heating 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] In another aspect, a computer readable storage medium is provided, and the computer readable storage medium stores at least one piece of computer program, which is loaded and executed by a processor to implement the heating method of the power battery of the vehicle in the embodiments of the present application.

[0023] In another aspect, a computer program product is provided, and the computer program product includes a computer program, which is executed by a processor to implement the heating method of the power battery of the vehicle in the embodiments of the present application.

[0024] The heating method of the power battery of the vehicle provided in the embodiments of the present application can obtain the preset discharge power of the power battery in the current operating state of the vehicle by table lookup according to the temperature and the remaining power of the power battery of the vehicle; and then determine whether to heat the power battery by comparing the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power satisfying the acceleration power demand. The above-mentioned method provides a battery heating strategy in the power dimension, which can reduce many unnecessary heating scenarios compared with simply determining whether to heat the power battery according to the temperature, such as if the actual discharge power of the power battery has met the acceleration power demand of the vehicle even in a low temperature environment, the power battery does not need to be heated. Therefore, the above-mentioned method can meet the power demand of the vehicle while reducing the heating energy consumption and improving the endurance of the vehicle in a low temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

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

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

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

[0031] In the present application, the terms "first", "second", etc. are used to distinguish the same or similar items with basically the same function, and it should be understood that there is no logical or time sequence relationship between "first", "second", "nth", and the number and execution order are not limited.

[0032] In the present application, the term "at least one" means one or more, and the term "multiple" 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 for analysis, stored data, displayed data, etc.) and signals involved in the present application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0034] Figure 1 is an implementation environment schematic diagram of a heating method of a vehicle power battery according to an embodiment of the present application, referring to 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 data through a CAN (Controller Area Network) bus.

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

[0036] The power battery 102 is a core module for providing power to the vehicle, and is configured to store and output electric energy. The temperature, remaining capacity, and discharge power of the power battery 102 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, configured 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 start, thereby achieving heating of the power battery 102.

[0038] The heating device 104 is configured to heat the power battery 102. The heating device 104 is usually arranged around the power battery 102. After the heating device 104 starts to work, it can directly heat the power battery 102 by emitting heat, or indirectly heat the power battery 102 by heating a conduction medium and then conducting heat through the conduction medium, thereby increasing the temperature of the power battery 102 and ensuring that the power battery 102 can maintain good discharge power in a low-temperature environment, and ensuring the power performance and endurance of the vehicle.

[0039] Figure 2 A flowchart of a heating method for a vehicle power battery according to an embodiment of the present application is shown in FIG. 1. The method is executed by the battery management system of the vehicle, and includes the following steps: Figure 2

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

[0041] In the embodiment of the present application, the battery management system (BMS) can detect the temperature and the remaining capacity of the power battery of the vehicle in real time. The battery management system can also query the preset discharge power of the power battery in the discharge mapping table according to the detected temperature and the remaining capacity. The discharge mapping table can also be referred to as a discharge map table. The discharge mapping table 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 capacities.

[0042] Optionally, the discharge mapping table is a data table. The discharge mapping table records the discharge characteristics, such as the preset discharge power, of the power battery under a plurality of working conditions in a table format. The preset discharge power of the power battery under a plurality of working conditions can be obtained by a large number of experiments on the power battery. For example, the discharge mapping table can be an M*N table. In the table, the preset discharge power of the power battery under different temperatures and remaining capacities 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 be 5%, 10%, etc. The embodiment of the present application does not limit this.

[0043] 202, The battery management system obtains the actual discharge power of the power battery and the target discharge power of the vehicle. The target discharge power is at least the discharge power required 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 target discharge power that is at least the discharge power required when the vehicle accelerates according to the obtained signals. For example, the acceleration demand corresponding to the acceleration signal of the vehicle includes but is not limited to 0-50 km / h (kilometers per hour), 0-100 km / h, etc. Different acceleration demands correspond to different target discharge powers.

[0045] Optionally, the battery management system can also obtain the current vehicle speed according to the vehicle speed signal. The battery management system usually stores a corresponding relationship between the vehicle speed and the target discharge power. Accordingly, after the battery management system obtains the vehicle speed, the battery management system determines the target discharge power corresponding to the vehicle speed. The target discharge power is at least the discharge power required when accelerating at the current vehicle speed.

[0046] 203, In the case that the size 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 improve 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 size relationship among the preset discharge power, the actual discharge power and the target discharge power. For example, in the case that 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 improve the actual discharge power of the power battery by increasing the temperature of the power battery, so as to meet the power demand of the vehicle.

[0048] The embodiment of the present application provides a heating method of a vehicle power battery, which can obtain the preset discharge power of the power battery in the current operating state by table lookup according to the temperature and the remaining capacity of the power battery of the vehicle. Then, whether to heat the power battery is determined by comparing the size relationship among the preset discharge power, the actual discharge power and the target discharge power meeting the acceleration power demand of the power battery. The above-mentioned method provides a battery heating strategy in the power dimension, which can reduce many unnecessary heating scenarios compared with simply determining whether to heat the power battery according to the temperature. For example, even in a low temperature environment, if the actual discharge power of the power battery has met the acceleration power demand of the vehicle, the power battery does not need to be heated. Therefore, the above-mentioned method can meet the power demand of the vehicle while reducing the heating energy consumption and improving the endurance of the vehicle in a low temperature environment.

[0049] Figure 3 is a flowchart of another heating method of a vehicle power battery provided by the embodiment of the present application, as shown in the method, the battery management system of the vehicle is taken as an example, and the method comprises the following steps: Figure 3

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

[0051] In the embodiment of the present application, the battery management system can read the temperature and the remaining capacity of the power battery of the vehicle. The remaining capacity can also be called SOC (States of Charge), which can reflect the percentage of the remaining capacity of the power battery. The discharge mapping table is used to record the preset discharge power of the power battery at different temperatures and remaining capacities. 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 process of querying the preset power in the discharge mapping table by the battery management system is described below.

[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. In the case that 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. In the case that 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 a temperature interval in which the temperature is located and a power interval in which the remaining power is located, to obtain the preset discharge power of the power battery. Through the 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 preset discharge power of the power battery under different temperatures and remaining powers is recorded in the discharge mapping table according to a temperature interval of 5℃ and a percentage interval of 5%. If the temperature of the power battery is -5℃ and the remaining power is 20%, the battery management system determines the discharge power located in the column (or row) of -5℃ 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℃ and the remaining power is 17%, the battery management system linearly interpolates two discharge powers located in the column (or row) of -5℃ 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 temperatures at different positions of the power battery. Accordingly, the battery management system can read the temperatures collected by the plurality of temperature sensors and determine the highest temperature and the lowest temperature therefrom. Then, the battery management system queries a first discharge power in the discharge mapping table according to the highest temperature and the remaining power of the power battery, and queries a 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 takes the smaller discharge power between the first discharge power and the second discharge power as the preset discharge power of the power battery. Since the temperatures at different positions of the power battery can be different, the first discharge power and the second discharge power are obtained by querying according to the highest temperature and the lowest temperature respectively, so that the actual temperature condition of the battery can be considered more comprehensively. In addition, by taking the 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, so that the endurance of the power battery is improved.

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

[0057] In the embodiment of the present application, after the battery management system obtains the preset discharge power of the power battery by table lookup, the preset discharge power is multiplied by the health coefficient of the power battery to obtain an updated preset discharge power. The health coefficient is an important index for measuring the health degree or performance degradation degree of the battery, and can intuitively reflect the health and life status of the battery. The health coefficient can also be referred to as 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 new state. The value range of the health coefficient is usually 0%-100%.

[0058] By updating the preset discharge power obtained by table lookup according to the health coefficient of the power battery, the performance degradation of the power battery with the increase of use time can be considered, 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, the target discharge power being the discharge power at least to be reached 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 at least to be reached when the vehicle accelerates, i.e. the target discharge power, according to the obtained signals. For example, the acceleration signals of the vehicle correspond to acceleration requirements including but not limited to 0-50 km / h (kilometers per hour), 0-100 km / h, etc., and different acceleration requirements correspond to different target discharge powers.

[0061] Alternatively, the battery management system can also obtain the current vehicle speed according to the vehicle speed signal. The battery management system usually stores a corresponding relationship between the vehicle speed and the target discharge power. Accordingly, after the battery management system obtains the vehicle speed, the target discharge power corresponding to the vehicle speed is determined. The target discharge power is the discharge power at least to be reached when accelerating at the current vehicle speed.

[0062] It should be noted that the execution order of steps 301-303 is not limited in the embodiment of the present application. 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 in the embodiment of the present application.

[0063] 304、In a case where the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power meets the heating condition, the battery management system sends a heating request to a vehicle control unit of the vehicle, and the vehicle control unit is configured to start a heating device of the power battery in response to the heating request to heat the power battery.

[0064] In the embodiments of the present application, the battery management system determines whether to heat the power battery according to the magnitude relationship among the preset discharge power, the actual discharge power and the target discharge power. In a case where the magnitude relationship among the above powers meets the heating condition, the battery management system sends a heating request to a vehicle control unit (VCU, Vehicle Control Unit). The vehicle control unit starts the heating device of the power battery in response to the heating request. The heating device can be a PTC (a kind of thermistor). After the heating device is started, the power battery can be directly heated by the heat emitted by the heating device, or the power battery can be indirectly heated by the heat emitted by the heating device through a conduction medium. The conduction medium can be circulating water, which is not limited in the embodiments of the present application. The power battery is heated by the heating device, which can improve the temperature of the power battery and ensure that the power battery can maintain good discharge power in a low temperature environment, thereby ensuring 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. 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 table lookup. In a case where 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. In a case where the target discharge power is not less than the preset discharge power, it indicates that the discharge power of the power battery at the current temperature and the remaining power cannot meet the acceleration power demand of the vehicle, so the power battery needs to be heated to improve the discharge power of the power battery, thereby ensuring the acceleration power of the vehicle.

[0066] In some embodiments, in order to consider partial extreme working condition scenarios, additional judgment logic of power battery heating can be added to refine the heating strategy of the power battery as much as possible. If the size 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 operating state of the vehicle is a preset state. The preset state includes at least one of the following: (1) the remaining power of the power battery is greater than a 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 can be avoided to start the power battery heating when the remaining power is low, thereby reducing the heating power loss in the low endurance scenario and improving the endurance of the vehicle. (2) the temperature of the power battery is less than a 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 less than the first temperature, it can be ensured that the power battery heating is started only in a low temperature environment, and a part of the power battery heating scenarios can be reduced, thereby improving the endurance of the vehicle. (3) if the vehicle is in a preset working condition, the duration of the vehicle in the preset working condition is less than a preset duration, and the preset working condition includes a parking working condition and an idling working condition. For example, if the duration of the vehicle in the P gear (parking working condition) or the duration of the vehicle with a speed of 0 (idling working condition) is less than 10 minutes, it indicates that the vehicle is in a short stay state, such as waiting for a traffic light, and the power battery heating can be started at this time. By starting the battery heating when the duration of the vehicle in the preset working condition is short, it can be avoided to heat the power battery when the vehicle is in the preset working condition for a long time, thereby reducing unnecessary heating loss and improving the endurance of the power battery.

[0067] 305、In the process of heating the power battery, if the operating state of the vehicle meets the stop heating condition, the battery management system stops heating the power battery.

[0068] In the embodiments of the present application, in the process of heating the power battery, the battery management system can also read the signals transmitted on the CAN bus to monitor the operating state of the vehicle in real time. If the operating state of the vehicle meets the stop heating condition, the battery management system sends a stop heating request to the vehicle controller. The vehicle controller responds to the stop heating request to control the heating device of the power battery to be closed, thereby stopping heating the power battery.

[0069] In some embodiments, the stopping the heating condition comprises any one 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. In the case that the target discharge power is less than the actual discharge power, it indicates that the current discharge power of the power battery can meet the acceleration power demand of the vehicle, and thus there is no need to heat the power battery, and the heating of the power battery can be stopped in time to reduce the heating loss 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, the heating of the power battery can be stopped in time when the power battery is separated from the low-temperature environment, thereby reducing the heating loss 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, and the endurance of the vehicle is improved.

[0070] In addition, it should be noted that in the case that the remaining power of the power battery is less than the third power, the power battery heating cannot be started, and usually other PTC heating of the vehicle, such as air conditioning heating, seat heating, etc., cannot be started, thereby further ensuring the endurance of the vehicle. The second power and the third power can be set according to actual needs, for example, the second power is 5%, and the third power is 3%.

[0071] In order to further verify the energy saving and endurance improvement of the power battery heating method provided in the embodiments of the present application, a comparison experiment is performed between the method and a traditional method of simply formulating a heating strategy according to temperature. In the traditional method, the heating of the power battery is started when the temperature of the power battery is less than -10℃, and the heating of the power battery is stopped when the temperature is higher than -5℃. In the comparison experiment, the following three working conditions are tested respectively: (1) the vehicle is discharged from full power to the point where it cannot run; (2) the air conditioner of the vehicle is turned on at medium level; (3) the vehicle speed is 85-100, and the vehicle load is 4 sandbags. Table 1 below shows the experimental results of the comparison experiment.

[0072] Table 1

[0073]

[0074] It can be known from the above table 1 that in the two heating methods, the vehicle charging process remains consistent, the starting temperature and the ending temperature remain consistent under the driving discharging condition, the starting residual power remains consistent and is discharged to the state of being unable to drive. Through comparison, compared with the traditional heating method, the discharging capacity of the heating method of the power battery provided in the embodiment of the application is higher, the power loss is reduced by 2.4 kWh (kilowatt hour), and the power for cruising is also increased by 2.26 kWh, and the overall cruising is increased by 12.8 km (kilometers). As can be seen, by using the heating method of the power battery provided in the embodiment of the application, the heating loss can be effectively reduced while the driving power is ensured, and the cruising of the vehicle is improved.

[0075] The embodiment of the application provides a heating method of a vehicle power battery, which can acquire a preset discharging power of a power battery under a current running state of the power battery by table lookup according to a temperature and a residual power of the power battery of the vehicle; and then whether the power battery is heated is determined by comparing a size relationship among the preset discharging power of the power battery, an actual discharging power and a target discharging power meeting an acceleration power demand. The above-mentioned method provides a battery heating strategy in the dimension of power, which can reduce more unnecessary heating scenarios compared with simply determining whether the power battery is heated according to the temperature, such as if the actual discharging power of the power battery has met the acceleration power demand of the vehicle even in a low temperature environment, the power battery does not need to be heated, and therefore the above-mentioned method can meet the power demand of the vehicle while reducing the heating energy consumption and improving the cruising of the vehicle in the low temperature environment.

[0076] Figure 4 is a block diagram of a heating device of a vehicle power battery according to the embodiment of the application. The device is used to execute the steps of the heating method of the vehicle power battery, as shown in Figure 4 The heating device of the vehicle power battery includes a query module 401, an acquisition module 402 and a heating module 403.

[0077] The query module 401 is used to query a preset discharging power of a power battery in a discharging mapping table of the power battery based on a temperature and a residual power of the power battery of the vehicle, and the discharging mapping table is used to record the preset discharging power of the power battery under different temperatures and residual powers;

[0078] The acquisition module 402 is used to acquire an actual discharging power of the power battery and a target discharging power of the vehicle, and the target discharging power is a discharging power at least to be reached when the vehicle accelerates;

[0079] The heating module 403 is used to heat the power battery in the case that a size relationship among the preset discharging power, the actual discharging power and the target discharging power meets a heating condition.

[0080] In some embodiments, the query module 401 is configured to, in a case where the temperature and the remaining power exist in the discharge mapping table, acquire a preset discharge power corresponding to the temperature and the remaining power; and in a case where the temperature or the remaining power does not exist in the discharge mapping table, perform interpolation on at least one preset discharge power in the discharge mapping table based on at least one of a temperature interval in which the temperature is located and a power interval in which the remaining power is located, to obtain the preset discharge power of the power battery.

[0081] In some embodiments, the power battery of the vehicle is provided with a plurality of temperature sensors, and the plurality of temperature sensors are configured to collect temperatures at different positions of the power battery.

[0082] The query module 401 is configured to query a first discharge power in the discharge mapping table based on a highest temperature collected by the plurality of temperature sensors and a remaining power of the power battery, and query a second discharge power in the discharge mapping table based on a lowest temperature collected by the plurality of temperature sensors and the remaining power of the power battery, and take a smaller one of 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 configured to update the preset discharge power of the power battery based on a health coefficient of the power battery.

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

[0085] In some embodiments, the heating module 403 is configured to send a heating request to a vehicle controller of the vehicle, and the vehicle controller is configured to start a 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 further configured to, if a size relationship among the preset discharge power, the actual discharge power and the target discharge power satisfies the heating condition, heat the power battery in a case where an operating state of the vehicle is a preset state; and the preset state includes at least one of the following: the remaining power of the power battery is greater than a first power; the temperature of the power battery is less than a first temperature; and if the vehicle is in a preset working condition, a time length during which the vehicle is in the preset working condition is less than a preset time length, and the preset working condition includes a parking working condition and an idling working condition.

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

[0089] In some embodiments, the stop heating condition comprises 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.

[0090] The embodiments of the present application provide a heating device for a power battery of a vehicle, which can obtain a preset discharge power of the power battery in a current operating state of the power battery by table lookup according to a temperature and a remaining power of the power battery of the vehicle, and determine whether to heat the power battery by comparing a size relationship among the preset discharge power, an actual discharge power and a target discharge power satisfying an acceleration power demand. The above-mentioned manner provides a battery heating strategy in the power dimension, which can reduce more unnecessary heating scenarios compared to simply determining whether to heat the power battery according to the temperature, such as if the actual discharge power of the power battery has met the acceleration power demand of the vehicle even in a low temperature environment, the power battery does not need to be heated, and therefore the above-mentioned manner can meet the power demand of the vehicle while reducing heating energy consumption and improving the endurance of the vehicle in a low temperature environment.

[0091] It should be noted that the heating device for a power battery of a vehicle provided in the above-mentioned embodiments is only taken as an example for the division of the above-mentioned functional modules in realizing its functions, and in actual applications, the above-mentioned functions can be completed by different functional modules according to needs, that is, the internal structure of the terminal is divided into different functional modules to complete all or part of the above-mentioned functions. In addition, the device and method embodiments provided in the above-mentioned embodiments belong to the same concept, and the implementation process is shown in the method embodiments, which will not be described herein.

[0092] In exemplary embodiments, a computer readable storage medium is also provided, and the computer readable storage medium stores at least one piece of computer program, which is loaded and executed by a processor to implement the heating method for a power battery of a vehicle in the above-mentioned embodiments.

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

[0094] The above merely preferred embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall 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 includes: Based on the temperature and remaining charge of the vehicle's power battery, the preset discharge power of the power battery is queried from the power battery discharge mapping table. The discharge mapping table is used to record the preset discharge power of the power battery under different temperatures and remaining charge. The actual discharge power of the power battery and the target discharge power of the vehicle are obtained, wherein the target discharge power is the minimum discharge power that the vehicle must achieve during acceleration. The power battery is heated when the relationship between the preset discharge power, the actual discharge power, and the target discharge power satisfies the heating conditions. The vehicle's power battery is equipped with multiple temperature sensors, which are used to collect the temperature at different locations 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, the first discharge power is queried in the discharge mapping table; Based on the lowest temperature collected by the multiple temperature sensors and the remaining power of the power battery, the second discharge power is queried in the discharge mapping table; The smaller of the first discharge power and the second discharge power is taken as the preset discharge power of the power battery.

2. The method according to claim 1, characterized in that, The process of querying the preset discharge power of the power battery in the power battery discharge mapping table based on the temperature and remaining charge of the vehicle's power battery includes: If the temperature and the remaining charge exist in the discharge mapping table, obtain the preset discharge power at the temperature and the remaining charge. If the temperature or the remaining charge is not present in the discharge mapping table, the preset discharge power of the power battery is obtained by interpolating at least one preset discharge power in the discharge mapping table based on at least one of the temperature range where the temperature is located and the charge range where the remaining charge is located.

3. The method according to any one of claims 1-2, characterized in that, The method further includes: Based on the health coefficient of the power battery, the preset discharge power of the power battery is updated.

4. The method according to claim 1, characterized in that, The process of obtaining the actual discharge power of the power battery and the target discharge power of the vehicle includes: Detect the actual discharge power of the power battery; Based on the vehicle's current speed, determine the target discharge power corresponding to that speed.

5. The method according to claim 1, characterized in that, The heating of the power battery includes: A heating request is sent to the vehicle controller, which activates the heating device of the power battery in response to the heating request.

6. 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.

7. The method according to claim 1, characterized in that, The method further includes: If the relationship between the preset discharge power, the actual discharge power, and the target discharge power satisfies the heating conditions, then the power battery is heated when the vehicle is in the preset operating state. The preset state includes at least one of the following: the remaining charge of the power battery is greater than a first charge; the temperature of the power battery is less than a first temperature; if the vehicle is in a preset operating condition, the duration of the vehicle in the preset operating condition is less than a preset duration, and the preset operating condition includes a parking operating condition and an idling operating condition.

8. The method according to claim 1, characterized in that, The method further includes: If the vehicle's operating state meets the conditions for stopping heating during the heating process, the heating of the power battery is stopped.

9. The method according to claim 8, characterized in that, The heating cessation condition includes any 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 higher than the second temperature; The remaining charge of the power battery is less than the second charge.

10. A heating device for a vehicle power battery, characterized in that, The device includes: The query module is used to query the preset discharge power of the power battery in the discharge mapping table based on the temperature and remaining charge of the vehicle's power battery. The discharge mapping table is used to record the preset discharge power of the power battery under different temperatures and remaining charge. The acquisition module is 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 minimum discharge power that the vehicle must achieve when accelerating. A heating module is used to heat the power battery when the relationship between the preset discharge power, the actual discharge power and the target discharge power satisfies the heating conditions. The vehicle's power battery is equipped with multiple temperature sensors, which are used to collect the temperature at different locations of the power battery. 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 charge of the power battery; and to query a second discharge power in the discharge mapping table based on the lowest temperature collected by the multiple temperature sensors and the remaining charge of the power battery; and to use the smaller of the first discharge power and the second discharge power as the preset discharge power of the power battery.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store at least one computer program for performing the heating method of the vehicle power battery according to any one of claims 1 to 9.

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