Battery preheating method, device, equipment and storage medium

Abstract

The present invention belongs to the field of automobile technology, and discloses a battery preheating method, device, equipment and storage medium; the method comprises: when a vehicle is in a commuting mode, obtaining an estimated travel time and a current battery cell temperature; determining a current battery heating threshold value according to historical vehicle battery heating parameters; obtaining an estimated battery cell heating time according to the current battery heating threshold value and the current battery cell temperature; and preheating the vehicle battery according to the estimated travel time and the estimated battery cell heating time; the present invention identifies the driving mode of the vehicle, and when the vehicle is in the commuting mode, obtains the time interval to when the user uses the vehicle according to the vehicle use time in the commuting mode, and determines whether the vehicle needs to be heated according to the battery cell temperature of the vehicle battery, so as to preheat the vehicle battery in time, put the vehicle battery in a healthier use state, and better recycle the heating energy, so as to avoid affecting the battery life due to the battery cell temperature being too low when the user uses the vehicle.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a battery preheating method, device, equipment and storage medium. Background Art

[0002] With the continuous development of automobile technology, users' demand for intelligent and networked vehicles is gradually increasing. They hope that cars are not only a means of transportation, but also can meet more and more humanized use experiences. Electric vehicles have sufficient power storage and can charge small batteries at any time, which provides energy guarantee for more on-board controllers, sensors, actuators and other devices to work under unpowered conditions.

[0003] As we all know, the operating temperature of the battery is strictly limited. When the temperature is below 0℃ or above 60℃, the charging and discharging efficiency of the battery is extremely low. For safety reasons, the temperature of the battery pack must be adjusted before the vehicle can be used. For most users, the most common usage scenario for the vehicle is daily commuting. According to the big data statistics of users' vehicle usage, the daily commuting time is short, 30min-45min per trip, 2-3 trips per day on average, and a single mileage of about 15km. Due to the short daily commuting time and mileage, on the one hand, it is necessary to improve the efficiency of heating and cooling the battery and passenger compartment to improve the car experience, and on the other hand, it is necessary to reduce the energy consumption used for heating and cooling the battery and passenger compartment to improve economy. This results in shorter daily commuting time and mileage. When commuting in low temperature conditions, the battery is frequently heated and cooled, but the usage rate is not high, which wastes vehicle energy and affects the battery life. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery preheating method, device, equipment and storage medium, aiming to solve the technical problems in the prior art that daily commuting time and mileage are short, and the battery is frequently heated and cooled during commuting under low temperature conditions but the utilization rate is not high, which causes vehicle energy waste and affects the battery life.

[0005] To achieve the above object, the present invention provides a battery preheating method, the method comprising the following steps:

[0006] When the vehicle is in commuter mode, obtain the estimated travel time and current battery cell temperature;

[0007] determining a current battery heating threshold based on historical vehicle battery heating parameters;

[0008] Obtaining an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature;

[0009] The battery of the vehicle is preheated according to the estimated travel time and the estimated battery cell heating time.

[0010] Optionally, the historical vehicle battery heating parameters include historical starting battery cell temperature, historical ending battery cell temperature, and historical battery heating gain power;

[0011] The determining of the current battery heating threshold according to the historical vehicle battery heating parameters includes:

[0012] Get the current starting cell temperature and current battery heating power gain;

[0013] When the current starting cell temperature and the historical starting cell temperature meet a preset temperature difference condition, obtaining a reference cut-off temperature according to the historical cut-off cell temperature, the current starting cell temperature and the historical starting cell temperature;

[0014] A current battery heating threshold is determined according to the reference cut-off temperature, the historical battery heating benefit power, and the current battery heating benefit power.

[0015] Optionally, determining a current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power, and the current battery heating gain power includes:

[0016] When the current battery heating benefit power is greater than or equal to the historical battery heating benefit power, using the reference cut-off temperature as the current battery heating threshold;

[0017] When the current battery heating benefit power is less than the historical battery heating benefit power, the historical cut-off battery cell temperature is used as the current battery heating threshold.

[0018] Optionally, before the current starting battery cell temperature and the historical starting battery cell temperature meet a preset temperature difference condition, the method further includes:

[0019] When the current starting battery cell temperature and the historical starting battery cell temperature do not satisfy a preset temperature difference condition, subtracting a preset temperature from the historical ending battery cell temperature to obtain a pending ending temperature;

[0020] A current battery heating threshold is determined according to the to-be-determined cut-off temperature, the historical battery heating benefit power, and the current battery heating benefit power.

[0021] Optionally, determining a current battery heating threshold according to the to-be-determined cut-off temperature, the historical battery heating gain power, and the current battery heating gain power includes:

[0022] When the current battery heating benefit power is less than the historical battery heating benefit power, using the to-be-determined cut-off temperature as the current battery heating threshold;

[0023] When the current battery heating profit power is greater than or equal to the historical battery heating profit power, the pending cut-off temperature is updated according to the preset temperature, the current battery heating profit power is updated according to the updated pending cut-off temperature, and the updated current battery heating profit power is compared with the historical battery heating profit power until the current battery heating profit power is less than the historical battery heating profit power.

[0024] Optionally, before determining the current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power, the method further includes:

[0025] Obtaining a historical battery heating power according to the historical starting battery cell temperature and the historical ending battery cell temperature;

[0026] Obtaining historical energy recovery power according to the historical battery heating power;

[0027] The historical battery heating benefit power is calculated according to the historical energy recovery power and the historical battery heating power.

[0028] Optionally, obtaining the estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature includes:

[0029] Get the battery heating rate;

[0030] Obtaining a temperature difference according to the current battery heating threshold minus the current battery cell temperature;

[0031] Calculate the estimated heating time of the battery cell according to the temperature difference and the battery heating rate;

[0032] Wherein, preheating the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time includes:

[0033] Acquire the current time, and obtain the time interval according to the current time and the estimated travel time;

[0034] When the time interval and the estimated heating time of the battery cells meet a preset time condition, the battery of the vehicle is preheated.

[0035] In addition, to achieve the above-mentioned purpose, the present invention further provides a battery preheating device, the battery preheating device comprising:

[0036] A parameter acquisition module, used to obtain the estimated travel time and current battery cell temperature when the vehicle is in commuting mode;

[0037] A heating threshold determination module, used to determine a current battery heating threshold based on historical vehicle battery heating parameters;

[0038] A battery preheating module, used to obtain an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature;

[0039] The battery preheating module is further used to preheat the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time.

[0040] In addition, to achieve the above-mentioned purpose, the present invention also proposes a battery preheating device, which includes: a memory, a processor, and a battery preheating program stored in the memory and executable on the processor, wherein the battery preheating program is configured to implement the steps of the battery preheating method described above.

[0041] In addition, to achieve the above-mentioned purpose, the present invention further proposes a storage medium, on which a battery preheating program is stored, and when the battery preheating program is executed by a processor, the steps of the battery preheating method described above are implemented.

[0042] The present invention identifies the driving mode of the vehicle. When the vehicle is in the commuting mode, the present invention obtains the time interval for the user to use the vehicle according to the user's vehicle usage time in the commuting mode, and at the same time determines whether the vehicle needs to be heated according to the battery cell temperature of the vehicle battery. The vehicle battery can be preheated more timely, so that the vehicle battery is in a healthier usage state, and the heating energy can be better recycled, avoiding the battery life being affected by the low battery cell temperature when the user is using the vehicle or the battery cell is not heated in time and the vehicle is not used for a short time, resulting in serious waste of battery heating energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a battery preheating device in a hardware operating environment involved in an embodiment of the present invention;

[0044] Figure 2 This is a schematic flow chart of a first embodiment of a battery preheating method according to the present invention;

[0045] Figure 3 A schematic diagram of a battery heating process according to an embodiment of a battery preheating method of the present invention;

[0046] Figure 4 This is a schematic flow chart of a second embodiment of a battery preheating method according to the present invention;

[0047] Figure 5A schematic diagram of calculating the current battery heating threshold value according to the first embodiment of the battery preheating method of the present invention;

[0048] Figure 6 This is a structural block diagram of the first embodiment of the battery preheating device of the present invention.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0051] Reference Figure 1 , Figure 1 It is a schematic diagram of the structure of a battery preheating device in the hardware operating environment involved in the embodiment of the present invention.

[0052] like Figure 1 As shown, the battery preheating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0053] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the battery preheating device, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0054] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a battery preheating program.

[0055] exist Figure 1In the battery preheating device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the battery preheating device of the present invention can be arranged in the battery preheating device, and the battery preheating device calls the battery preheating program stored in the memory 1005 through the processor 1001, and executes the battery preheating method provided in an embodiment of the present invention.

[0056] The embodiment of the present invention provides a battery preheating method, referring to Figure 2 , Figure 2 It is a schematic flow chart of a first embodiment of a battery preheating method of the present invention.

[0057] In this embodiment, the battery preheating method includes the following steps:

[0058] Step S10: When the vehicle is in commuting mode, obtain the estimated travel time and the current battery cell temperature.

[0059] It is understandable that the commuting mode can be a mode set in advance according to the vehicle usage time, for example, Monday to Friday is the commuting time, and more specifically, 8:00-9:00 in the morning from Monday to Friday is the commuting mode. It can be obtained through vehicle usage information collected through training and user car usage habits, and the user's regular car usage time period is used as a sign of the commuting mode.

[0060] It should be understood that the commuting mode setting can be pre-set, or it can be set as the commuting mode within a specified time based on the user's multiple historical vehicle usage information and then identified through the vehicle's internal algorithm.

[0061] It should be noted that for new energy vehicles, power batteries are an important component of the vehicle. Power batteries need to work in a suitable temperature range, generally 15℃-40℃. High temperature mainly affects the safety of the battery, while low temperature affects the battery's charging and discharging power, and the battery's capacity will also decay. The reduction in the battery's discharge power will affect the vehicle's power and endanger driving safety. The reduction in the battery's charging power will affect the vehicle's kinetic energy recovery efficiency, causing an increase in energy consumption, and the decay of the battery capacity will affect the vehicle's endurance.

[0062] It should be further explained that automobile manufacturers will adopt a battery heating strategy in low temperature environments to heat the battery cells to the target temperature. The target temperature setting is derived from the battery's charge and discharge power MAP. At the target temperature, the battery's charge and discharge power can meet the requirements for vehicle power and economy. Generally, the target temperature for battery cell heating is a fixed value related to the ambient temperature and the vehicle's driving mode.

[0063] It should be emphasized that the commuting scenario has a short time and mileage, and there is no intense driving. The conventional battery heating strategy can certainly ensure sufficient vehicle power, but after consuming more energy and time to heat the battery to the target temperature, the vehicle only uses a short time or mileage to complete a single trip, and is stationary for 4-8 hours before being used again. Conventional battery heating strategies usually take the basic requirements of meeting the power and economy of the vehicle. Therefore, there are two obvious disadvantages of conventional battery heating strategies applied to commuting scenarios. First, due to the large specific heat capacity of the battery pack, it takes a long time to heat the battery pack to the specified temperature. For example, the heating rate of the battery pack at low temperature is 0.5℃ / min, and it takes 40 minutes to heat the battery pack from -15℃ to 5℃. The battery pack temperature is low most of the time during commuting, which affects the vehicle's power and the energy recovery efficiency is also low. Secondly, the working state of the battery after being heated is not fully utilized, and the commuting is over.

[0064] It is worth noting that when the vehicle's control system recognizes that the vehicle is in a commuting mode cycle, the vehicle's battery is thermally pre-treated before the vehicle travels. The pre-treatment of heating or cooling the battery can ensure the vehicle's basic power and energy recovery efficiency, thereby achieving energy saving.

[0065] It should be noted that the executor of this embodiment is a battery preheating device, wherein the battery preheating device has functions such as data processing, data communication and program running. The battery preheating device can be an integrated controller, a control computer and other devices, and of course it can also be other devices with similar functions, which is not limited in this embodiment.

[0066] Step S20: Determine the current battery heating threshold according to the historical vehicle battery heating parameters.

[0067] It is understandable that the historical vehicle battery heating parameters may include a historical starting cell temperature, a historical ending cell temperature, and a historical battery heating gain power.

[0068] It should be understood that the current battery heating threshold may be a cutoff temperature for heating the battery cell when the battery cell of the vehicle is heated at this time.

[0069] It should be noted that based on the historical vehicle battery heating parameters, the heating cut-off temperature of the battery cell in the previous historical commuting mode, as well as the energy recovery power of the battery during commuting and the battery heating profit power under different heating cut-off temperatures can be obtained. The historical battery heating threshold can be adjusted based on the energy recovery power and the battery heating profit power during commuting to obtain the current battery heating threshold, so that the current battery heating threshold can obtain higher energy recovery power and battery heating profit power.

[0070] Step S30: obtaining an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature.

[0071] It is understandable that in order to address the disadvantage of long battery heating time, after the vehicle enters the commuting mode, and the controller detects that the initial battery temperature is lower than a certain threshold (i.e., the minimum temperature, and the battery is heated when the initial battery temperature is lower than the minimum temperature) and needs to be heated, the heating time is calculated.

[0072] It should be noted that the battery heating temperature rise rate is obtained; the temperature difference is obtained by subtracting the current battery cell temperature from the current battery heating threshold; and the battery cell heating estimated time is calculated based on the temperature difference and the battery heating temperature rise rate.

[0073] In the specific implementation summary, the calculation of heating time can refer to the following formula:

[0074]

[0075] Where t represents the heating time, T s0 is the starting cell temperature, T e0 The battery heating end temperature is the battery heating end temperature, η is the battery heating rate (related to the specific battery pack, usually about 0.5℃ / min), and the battery heating is turned on in advance. For the specific heating process, please refer to Figure 3 .

[0076] Step S40: preheating the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time.

[0077] It is understandable that the estimated travel time can be an approximate travel time obtained based on the user's car usage habits in commuting mode.

[0078] It should be understood that the estimated travel time can be used to determine how long the user will use the vehicle. In order to avoid the situation where the vehicle battery has been heated but the user has not yet used the vehicle, the start time of the battery heating can be controlled based on the estimated battery cell heating time, so as to try to make the vehicle preheating time match the user's vehicle use time.

[0079] It should be noted that the battery preheating of the vehicle based on the estimated travel time and the estimated battery cell heating time includes: obtaining the current time, and obtaining a time interval based on the current time and the estimated travel time; when the time interval and the estimated battery cell heating time meet a preset time condition, the battery preheating of the vehicle is performed.

[0080] It is understandable that the time interval may be the time interval between the current time and the time when the user uses the car, which is calculated based on the user's car usage habits in the commuting mode.

[0081] It should be understood that when the time interval and the estimated heating time of the battery cell meet the preset time condition, the time interval may be less than or equal to the estimated heating time of the battery cell. If the time interval is greater than the estimated heating time of the battery cell, the time interval and the estimated heating time of the battery cell are periodically judged, and preheating is performed when the preset time condition is met.

[0082] This embodiment identifies the driving mode of the vehicle. When the vehicle is in the commuting mode, the time interval for the user to use the vehicle is obtained according to the user's vehicle usage time in the commuting mode. At the same time, it is determined whether the vehicle needs to be heated according to the battery cell temperature of the vehicle battery. The vehicle battery can be preheated in a more timely manner, so that the vehicle battery is in a healthier usage state, and the heating energy can be better recycled, avoiding the battery life being affected by the low battery cell temperature when the user is using the vehicle or the battery cell is not heated in time and the vehicle is not used for a short time, resulting in serious waste of battery heating energy.

[0083] refer to Figure 4 , Figure 4 FIG. 1 is a flow chart of a second embodiment of a battery preheating method according to the present invention.

[0084] Based on the first embodiment, the battery preheating method of this embodiment includes, in step S20:

[0085] Step S21: Obtain the current starting battery cell temperature and the current battery heating gain power.

[0086] It should be understood that the current starting cell temperature is the temperature of the battery when the battery begins to be heated. The current battery heating gain power is the gain obtained by heating the battery to improve its performance and working efficiency. Battery heating is an important technology for electric vehicles because it can help the battery maintain a proper temperature in a low temperature environment, thereby improving the charging and discharging efficiency of the battery, as well as extending the battery life. Generally speaking, the battery heating gain power of an electric vehicle can reach a maximum of 5 to 10kW, which is used to heat the battery to a temperature suitable for normal operation. This heater can be very important when starting the vehicle in winter. It should be noted that when the battery heater is used, a portion of the battery power will also be consumed.

[0087] It should be noted that the current battery heating gain power can be the battery heating gain power that the vehicle will generate based on the heating calculation at the current starting battery cell temperature.

[0088] It is understandable that according to the chemical characteristics of the battery cell, as the battery temperature decreases, the maximum charging power of the battery cell continues to decrease, and as the battery SOC decreases, the maximum charging power of the battery cell continues to increase. Therefore, when the ambient temperature does not change much, in commuting mode, the maximum charging power of the battery increases day by day as the SOC decreases. When SOC ≥ 90%, in order to prevent the battery from overcharging, the maximum charging power is small, so there is very little energy recovery during commuting. At this time, only consider heating the battery to the minimum battery cell temperature required to meet basic power. When SOC < 90%, the maximum charging power increases rapidly, and the maximum charging power can basically meet the energy recovery requirements of the commuting process.

[0089] It should be noted that in order to achieve a more balanced performance and energy consumption in commuting mode, a set of battery cell heating thresholds for commuting mode are preset before the vehicle leaves the factory, and different battery cell starting temperature conditions match different battery cell heating cut-off temperatures; when the vehicle controller recognizes that it has entered a cycle in commuting mode, and the battery cell temperature before the vehicle travels is low and there is a need for heating, the battery cell will be pre-heated before the trip according to the initial battery cell heating threshold of the commuting mode.

[0090] Step S22: when the current starting cell temperature and the historical starting cell temperature meet a preset temperature difference condition, a reference cut-off temperature is obtained according to the historical cut-off cell temperature, the current starting cell temperature and the historical starting cell temperature.

[0091] It should be noted that before making a judgment on the preset temperature difference condition, it is also necessary to judge whether the battery power at this time meets the power requirement. The power requirement can be that the battery power at this time is greater than or equal to the first power threshold and the battery power is less than the second power threshold. The first power threshold can be 90% of the total battery power, and the second power threshold can be 15% of the total battery power. The first power threshold and the second power threshold can also be other proportions, which are not limited in this embodiment.

[0092] It should be noted that the preset temperature difference condition may be that the current starting cell temperature is higher than the historical starting cell temperature by a preset temperature, and the preset temperature may be 3° C., 4° C., etc.

[0093] It should be understood that the historical data mentioned in this embodiment are all corresponding parameters when the battery heating threshold was calculated last time. For example, the historical starting cell temperature can be the starting cell temperature corresponding to the last calculation of the battery heating threshold.

[0094] It should be noted that the reference cut-off temperature obtained according to the historical cut-off battery cell temperature, the current starting battery cell temperature and the historical starting battery cell temperature can be obtained by subtracting the historical starting battery temperature from the current starting battery temperature to obtain the starting battery temperature difference; and adding the historical battery heating threshold to the starting battery temperature difference to obtain the reference cut-off temperature.

[0095] It should be noted that, before the current starting battery cell temperature and the historical starting battery cell temperature meet the preset temperature difference condition, it also includes: when the current starting battery cell temperature and the historical starting battery cell temperature do not meet the preset temperature difference condition, subtracting the preset temperature from the historical cut-off battery cell temperature to obtain a pending cut-off temperature; determining the current battery heating threshold according to the pending cut-off temperature, the historical battery heating gain power and the current battery heating gain power.

[0096] It should be further explained that the determining of the current battery heating threshold value based on the pending cut-off temperature, the historical battery heating profit power and the current battery heating profit power includes: when the current battery heating profit power is less than the historical battery heating profit power, using the pending cut-off temperature as the current battery heating threshold value; when the current battery heating profit power is greater than or equal to the historical battery heating profit power, updating the pending cut-off temperature according to the preset temperature, updating the current battery heating profit power according to the updated pending cut-off temperature, and comparing the updated current battery heating profit power with the historical battery heating profit power until the current battery heating profit power is less than the historical battery heating profit power.

[0097] Among them, it can be understood that after the pending cut-off temperature is calculated, the battery heating benefit power based on the pending cut-off temperature and the current battery starting temperature can be calculated according to the pending cut-off temperature. When the current battery heating benefit power is less than the historical battery heating benefit power, the pending cut-off temperature is used as the current battery heating threshold.

[0098] It should be understood that the pending cut-off temperature is updated according to the preset temperature, the current battery heating benefit power is updated according to the updated pending cut-off temperature, and the updated current battery heating benefit power is compared with the historical battery heating benefit power, until the current battery heating benefit power is less than the historical battery heating benefit power. It can be understood that when the current battery heating benefit power is greater than or equal to the historical battery heating benefit power, the pending cut-off temperature is subtracted from the preset temperature to obtain a new pending cut-off temperature. The preset temperature can be 3°C, 4°C, etc., without limitation. Until the current battery heating benefit power calculated according to the pending cut-off temperature is less than the historical battery heating benefit power, the update of the pending cut-off temperature is stopped, and the updated pending cut-off temperature is used as the current battery heating threshold.

[0099] Step S23: determining a current battery heating threshold value according to the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power.

[0100] It should be noted that when the current battery heating profit power is greater than or equal to the historical battery heating profit power, the reference cut-off temperature is used as the current battery heating threshold; when the current battery heating profit power is less than the historical battery heating profit power, the historical cut-off battery cell temperature is used as the current battery heating threshold.

[0101] It should be further explained that before determining the current battery heating threshold based on the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power, it also includes: obtaining the historical battery heating power based on the historical starting battery cell temperature and the historical cut-off battery cell temperature; obtaining the historical energy recovery power based on the historical battery heating power; and calculating the historical battery heating gain power based on the historical energy recovery power and the historical battery heating power.

[0102] Among them, it is understandable that in electric vehicles, energy recovery power refers to the efficiency of the vehicle to recover kinetic energy through the motor during braking or coasting. Specifically, the size of the energy recovery power depends on factors such as the driving state of the vehicle, the charging state of the battery, and the setting of the control system. Depending on the different models and control systems, the range of energy recovery power will also vary. Generally speaking, the energy recovery power can reach tens of kilowatts, for example, some models can reach 40 to 50kW. This means that during braking or coasting, the vehicle can recover a considerable part of the kinetic energy and convert it into electrical energy and store it in the battery, thereby increasing the vehicle's cruising range. It should be noted that the energy recovery power is not a fixed value, it will change with the driving state of the vehicle and the charging state of the battery. At the same time, the size of the energy recovery power is also limited by the control system, and different control systems may have an impact on the energy recovery efficiency.

[0103] In a specific implementation, after completing one advance battery heating and one commuting, record the battery heating cut-off temperature Te0 of the initial battery heating commuting, the ambient temperature Tatm0, the total power consumption of a single commuting Ptotal0, the starting cell temperature Ts0 of the battery heating, the minimum cell temperature Tb required to ensure basic power, the battery heating electric power Pe0, the energy recovery power Pr0 during commuting, calculate the battery heating profit power Pb0 (Pb0 = Pr0-Pe0), and record the ambient temperature of each subsequent commuting day. The total power consumption of commuting, the battery heating starting temperature, the battery heating cut-off temperature, the battery heating electric power, the energy recovery power during commuting, and the battery heating profit power are Tatmn, Ptotaln, Tsn, Ten, Pen, Prn, Pbn, respectively, where n = 1, 2, 3... is the serial number of the day, and the initial, the specific calculation strategy of the battery cell heating cut-off temperature can be referred to. Figure 5 .

[0104] This embodiment obtains the current starting cell temperature and the current battery heating profit power, and continuously adjusts the historical cut-off cell temperature according to the temperature difference between the starting cell temperature and the historical starting cell temperature to obtain a current cut-off temperature that is more in line with the current starting cell temperature. The cut-off temperature is continuously adjusted each time based on the historical cut-off temperature to obtain a higher battery heating profit power, which can better meet the battery heating requirements each time and enable better battery prediction.

[0105] In addition, an embodiment of the present invention further provides a storage medium, on which a battery preheating program is stored. When the battery preheating program is executed by a processor, the steps of the battery preheating method described above are implemented.

[0106] Reference Figure 6 , Figure 6 This is a structural block diagram of the first embodiment of the battery preheating device of the present invention.

[0107] like Figure 6 As shown, the battery preheating device proposed in the embodiment of the present invention includes:

[0108] The parameter acquisition module 10 is used to obtain the estimated travel time and the current battery cell temperature when the vehicle is in the commuting mode;

[0109] A heating threshold determination module 20, for determining a current battery heating threshold according to historical vehicle battery heating parameters;

[0110] A battery preheating module 30, configured to obtain an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature;

[0111] The battery preheating module 30 is further used to preheat the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time.

[0112] This embodiment identifies the driving mode of the vehicle. When the vehicle is in the commuting mode, the time interval for the user to use the vehicle is obtained according to the user's vehicle usage time in the commuting mode. At the same time, it is determined whether the vehicle needs to be heated according to the battery cell temperature of the vehicle battery. The vehicle battery can be preheated in a more timely manner, so that the vehicle battery is in a healthier usage state, and the heating energy can be better recycled, avoiding the battery life being affected by the low battery cell temperature when the user is using the vehicle or the battery cell is not heated in time and the vehicle is not used for a short time, resulting in serious waste of battery heating energy.

[0113] In one embodiment, the heating threshold determination module 20 is further used to obtain the current starting battery cell temperature and the current battery heating gain power;

[0114] When the current starting cell temperature and the historical starting cell temperature meet a preset temperature difference condition, obtaining a reference cut-off temperature according to the historical cut-off cell temperature, the current starting cell temperature and the historical starting cell temperature;

[0115] A current battery heating threshold is determined according to the reference cut-off temperature, the historical battery heating benefit power, and the current battery heating benefit power.

[0116] In one embodiment, the heating threshold determination module 20 is further configured to use the reference cutoff temperature as the current battery heating threshold when the current battery heating benefit power is greater than or equal to the historical battery heating benefit power;

[0117] When the current battery heating benefit power is less than the historical battery heating benefit power, the historical cut-off battery cell temperature is used as the current battery heating threshold.

[0118] In one embodiment, the heating threshold determination module 20 is further configured to, when the current starting battery cell temperature and the historical starting battery cell temperature do not satisfy a preset temperature difference condition, subtract a preset temperature from the historical ending battery cell temperature to obtain a pending ending temperature;

[0119] A current battery heating threshold is determined according to the to-be-determined cut-off temperature, the historical battery heating benefit power, and the current battery heating benefit power.

[0120] In one embodiment, the heating threshold determination module 20 is further configured to use the to-be-determined cut-off temperature as the current battery heating threshold when the current battery heating benefit power is less than the historical battery heating benefit power;

[0121] When the current battery heating profit power is greater than or equal to the historical battery heating profit power, the pending cut-off temperature is updated according to the preset temperature, the current battery heating profit power is updated according to the updated pending cut-off temperature, and the updated current battery heating profit power is compared with the historical battery heating profit power until the current battery heating profit power is less than the historical battery heating profit power.

[0122] In one embodiment, the heating threshold determination module 20 is further used to obtain a historical battery heating power according to the historical starting battery cell temperature and the historical ending battery cell temperature;

[0123] Obtaining historical energy recovery power according to the historical battery heating power;

[0124] The historical battery heating benefit power is calculated according to the historical energy recovery power and the historical battery heating power.

[0125] In one embodiment, the battery preheating module 30 is further used to obtain the battery heating temperature rise rate;

[0126] Obtaining a temperature difference according to the current battery heating threshold minus the current battery cell temperature;

[0127] Calculate the estimated heating time of the battery cell according to the temperature difference and the battery heating rate;

[0128] Wherein, preheating the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time includes:

[0129] Acquire the current time, and obtain the time interval according to the current time and the estimated travel time;

[0130] When the time interval and the estimated heating time of the battery cells meet a preset time condition, the battery of the vehicle is preheated.

[0131] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0132] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0133] In addition, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0134] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0135] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0136] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0137] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery preheating method, characterized in that: The battery preheating method comprises: When the vehicle is in commuter mode, obtain the estimated travel time and current battery cell temperature; Determining a current battery heating threshold according to historical vehicle battery heating parameters, wherein the historical vehicle battery heating parameters include a historical starting battery cell temperature, a historical ending battery cell temperature, and a historical battery heating gain power; Obtaining an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature; preheating a battery of the vehicle according to the estimated travel time and the estimated battery cell heating time; The determining of the current battery heating threshold according to the historical vehicle battery heating parameters includes: Get the current starting cell temperature and current battery heating power gain; When the current starting cell temperature and the historical starting cell temperature meet a preset temperature difference condition, obtaining a reference cut-off temperature according to the historical cut-off cell temperature, the current starting cell temperature and the historical starting cell temperature; determining a current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power, and the current battery heating gain power; The determining the current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power comprises: When the current battery heating benefit power is greater than or equal to the historical battery heating benefit power, using the reference cut-off temperature as the current battery heating threshold; When the current battery heating benefit power is less than the historical battery heating benefit power, using the historical cut-off battery cell temperature as the current battery heating threshold; Before determining the current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power, the method further includes: Obtaining a historical battery heating power according to the historical starting battery cell temperature and the historical ending battery cell temperature; Obtaining historical energy recovery power according to the historical battery heating power; The historical battery heating benefit power is calculated according to the historical energy recovery power and the historical battery heating power.

2. The battery preheating method according to claim 1, characterized in that: Before the current starting battery core temperature and the historical starting battery core temperature meet a preset temperature difference condition, the method further includes: When the current starting battery cell temperature and the historical starting battery cell temperature do not satisfy a preset temperature difference condition, subtracting a preset temperature from the historical ending battery cell temperature to obtain a pending ending temperature; A current battery heating threshold is determined according to the to-be-determined cut-off temperature, the historical battery heating benefit power, and the current battery heating benefit power.

3. The battery preheating method according to claim 2, characterized in that: The determining the current battery heating threshold according to the to-be-determined cut-off temperature, the historical battery heating gain power, and the current battery heating gain power includes: When the current battery heating benefit power is less than the historical battery heating benefit power, using the to-be-determined cut-off temperature as the current battery heating threshold; When the current battery heating profit power is greater than or equal to the historical battery heating profit power, the pending cut-off temperature is updated according to the preset temperature, the current battery heating profit power is updated according to the updated pending cut-off temperature, and the updated current battery heating profit power is compared with the historical battery heating profit power until the current battery heating profit power is less than the historical battery heating profit power.

4. The battery preheating method according to any one of claims 1 to 3, characterized in that: The obtaining the estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature includes: Get the battery heating rate; Obtaining a temperature difference according to the current battery heating threshold minus the current battery cell temperature; Calculate the estimated heating time of the battery cell according to the temperature difference and the battery heating rate; Wherein, preheating the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time includes: Acquire the current time, and obtain the time interval according to the current time and the estimated travel time; When the time interval and the estimated heating time of the battery cells meet a preset time condition, the battery of the vehicle is preheated.

5. A battery preheating device, characterized in that: The battery preheating device comprises: A parameter acquisition module, used to obtain the estimated travel time and current battery cell temperature when the vehicle is in commuting mode; A heating threshold determination module, used to determine a current battery heating threshold according to historical vehicle battery heating parameters, wherein the historical vehicle battery heating parameters include a historical starting battery cell temperature, a historical ending battery cell temperature, and a historical battery heating gain power; A battery preheating module, used to obtain an estimated battery cell heating time according to the current battery heating threshold and the current battery cell temperature; The battery preheating module is further used to preheat the battery of the vehicle according to the estimated travel time and the estimated battery cell heating time; The heating threshold determination module is further used to obtain the current starting battery cell temperature and the current battery heating gain power; when the current starting battery cell temperature and the historical starting battery cell temperature meet the preset temperature difference condition, obtain the reference cut-off temperature according to the historical cut-off battery cell temperature, the current starting battery cell temperature and the historical starting battery cell temperature; determine the current battery heating threshold according to the reference cut-off temperature, the historical battery heating gain power and the current battery heating gain power; The heating threshold determination module is further configured to use the reference cut-off temperature as the current battery heating threshold when the current battery heating gain power is greater than or equal to the historical battery heating gain power; and use the historical cut-off battery cell temperature as the current battery heating threshold when the current battery heating gain power is less than the historical battery heating gain power; The heating threshold determination module is also used to obtain the historical battery heating power according to the historical starting battery cell temperature and the historical ending battery cell temperature; obtain the historical energy recovery power according to the historical battery heating power; and calculate the historical battery heating gain power according to the historical energy recovery power and the historical battery heating power.

6. A battery preheating device, characterized in that: The device comprises: a memory, a processor, and a battery preheating program stored in the memory and executable on the processor, wherein the battery preheating program is configured to implement the battery preheating method according to any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium stores a battery preheating program, and when the battery preheating program is executed by the processor, the battery preheating method according to any one of claims 1 to 4 is implemented.

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