A temperature control method, device, and equipment of a vehicle battery and a storage medium

Abstract

The application discloses a temperature control method, device and equipment of a vehicle battery and a storage medium, and relates to the technical field of vehicles. The method comprises the following steps: acquiring a first battery temperature of a vehicle, a first ambient temperature of an environment in which the vehicle is located, and a first target curve, wherein the first target curve is a curve of the dischargeable capacity of the battery of the vehicle varying with the battery temperature; acquiring a second target curve according to the corresponding relationship between a reference ambient temperature, the battery temperature and a second reference curve, wherein the second target curve is a curve of the energy consumption of the vehicle for heating the battery varying with the battery temperature; determining a target temperature according to the first target curve and the second target curve, wherein the target temperature is a temperature corresponding to the situation that the slope of the first target curve is consistent with the slope of the second target curve; and controlling the temperature of the battery of the vehicle according to the first battery temperature, the target temperature and a first temperature threshold. The method can reduce the influence of low temperature on the cruising range of the vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, device, and storage medium for temperature control of a vehicle battery. Background Technology

[0002] In the field of vehicle technology, new energy vehicles generally include a power battery and an electric motor, where the power battery provides electrical energy to the electric motor, and the electric motor provides power to the vehicle.

[0003] The energy of new energy vehicles mainly comes from power batteries. When the temperature of the power battery is low, its discharge capacity also decreases, thus affecting the vehicle's driving range. To address this, a temperature threshold can be set. If the temperature of the power battery falls below this threshold, the vehicle will activate the battery heater to prevent the power battery temperature from dropping too low.

[0004] Although heating the battery can increase its temperature, it does not necessarily increase its discharge capacity. In fact, the power consumption of heating may further reduce the discharge capacity of the battery, thereby affecting the vehicle's driving range. Summary of the Invention

[0005] This application provides a method, apparatus, device, and storage medium for controlling the temperature of a vehicle battery, which can reduce the impact of low temperature on the driving range of a vehicle.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a method for temperature control of a vehicle battery, including:

[0008] The vehicle's first battery temperature, the first ambient temperature of the environment in which the vehicle is located, and a first target curve are obtained. The first target curve is the curve showing the change in the vehicle's battery discharge capacity with battery temperature.

[0009] Based on the correspondence between the reference ambient temperature, battery temperature and the second reference curve, the second target curve corresponding to the first ambient temperature and the first battery temperature is obtained. The second target curve is the curve of the energy consumption of the vehicle heating the battery as a function of the battery temperature.

[0010] Based on the first target curve and the second target curve, a target temperature is determined, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent;

[0011] The temperature of the vehicle's battery is controlled based on the first battery temperature, the target temperature, and the first temperature threshold.

[0012] In some possible implementations, controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes:

[0013] If the target temperature is greater than or equal to the first temperature threshold and the first battery temperature is less than the first temperature threshold, then the temperature of the vehicle's battery is heated to the first temperature threshold.

[0014] In some possible implementations, controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes:

[0015] If the target temperature is less than or equal to the first battery temperature, and the first battery temperature is less than the first temperature threshold, then the vehicle's battery will not be actively heated.

[0016] In some possible implementations, controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes:

[0017] If the target temperature is greater than the first battery temperature and the target temperature is less than the first temperature threshold, then the battery temperature of the vehicle is heated to the target temperature.

[0018] In some possible implementations, the method further includes:

[0019] Obtain the temperature of the vehicle's battery after temperature control; if the temperature after temperature control is greater than or equal to the minimum of a first temperature threshold and the target temperature, stop heating the vehicle's battery; or,

[0020] The battery charge level of the vehicle after temperature control is obtained. If the charge level after temperature control is less than or equal to a first charge threshold, heating of the vehicle's battery is stopped.

[0021] In some possible implementations, the method further includes, prior to obtaining the first battery temperature of the vehicle:

[0022] The second battery temperature of the vehicle and a second temperature threshold are obtained, wherein the second temperature threshold is the lowest temperature corresponding to the discharge power of the vehicle being a first preset power;

[0023] If the temperature of the second battery is lower than the second temperature threshold, the battery of the vehicle is heated to the second temperature threshold.

[0024] In some possible implementations, after heating the vehicle's battery to the second temperature threshold, the method further includes:

[0025] Obtain the first remaining battery charge of the vehicle and the third battery temperature of the vehicle;

[0026] If the first remaining battery power is greater than the first battery power threshold, the first remaining battery power is less than the second battery power threshold, and the third battery temperature is less than the first temperature threshold, then the step of obtaining the first battery temperature of the vehicle is executed; otherwise, the vehicle's battery is not actively heated.

[0027] Secondly, this application provides a temperature control device for a vehicle battery, comprising:

[0028] The acquisition module is used to acquire the first battery temperature of the vehicle, the first ambient temperature of the environment in which the vehicle is located, and a first target curve, wherein the first target curve is the curve of the discharge capacity of the vehicle's battery changing with the battery temperature; and according to the correspondence between the reference ambient temperature, the battery temperature and the second reference curve, acquire the first ambient temperature and the second target curve corresponding to the first battery temperature, wherein the second target curve is the curve of the energy consumption of the vehicle to heat the battery changing with the battery temperature.

[0029] The determining module is used to determine a target temperature based on the first target curve and the second target curve, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent;

[0030] The control module is used to control the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold.

[0031] In some possible implementations, the control module is specifically configured to heat the battery of the vehicle to the first temperature threshold if the target temperature is greater than or equal to the first temperature threshold and the first battery temperature is less than the first temperature threshold.

[0032] In some possible implementations, the control module is specifically configured to not actively heat the vehicle's battery if the target temperature is less than or equal to the first battery temperature, and the first battery temperature is less than the first temperature threshold.

[0033] In some possible implementations, the control module is specifically configured to heat the battery of the vehicle to the target temperature if the target temperature is greater than the first battery temperature and the target temperature is less than a first temperature threshold.

[0034] In some possible implementations, the acquisition module is further configured to acquire the temperature of the vehicle's battery after temperature control; the control module is further configured to stop heating the vehicle's battery if the temperature after temperature control is greater than or equal to the minimum of a first temperature threshold and the target temperature; or,

[0035] The acquisition module is also used to acquire the battery charge of the vehicle after temperature control;

[0036] The control module is also configured to stop heating the vehicle's battery if the battery level after temperature control is less than or equal to a first battery level threshold.

[0037] In some possible implementations, the acquisition module is further configured to acquire the second battery temperature of the vehicle and a second temperature threshold, wherein the second temperature threshold is the lowest temperature corresponding to when the discharge power of the vehicle is a first preset power;

[0038] The control module is further configured to heat the vehicle's battery to the second temperature threshold if the second battery temperature is lower than the second temperature threshold.

[0039] In some possible implementations, the acquisition module is further configured to acquire the first remaining charge of the vehicle's battery and the third battery temperature of the vehicle;

[0040] The control module is further configured to perform the step of obtaining the first battery temperature of the vehicle if the first remaining power is greater than the first power threshold, the first remaining power is less than the second power threshold, and the third battery temperature is less than the first temperature threshold; otherwise, the vehicle battery is not actively heated.

[0041] Thirdly, this application provides a computing device, including a memory and a processor;

[0042] The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of the first aspects.

[0043] Fourthly, this application provides a computer-readable storage medium for storing a computer program for performing the method as described in any one of the first aspects.

[0044] As can be seen from the above technical solution, this application has at least the following beneficial effects:

[0045] This application discloses a method for controlling the temperature of a vehicle battery. The method includes: acquiring a first battery temperature, a first ambient temperature of the vehicle's environment, and a first target curve, where the first target curve represents the change in the vehicle's discharge capacity with battery temperature; acquiring a second target curve corresponding to the first ambient temperature and the first battery temperature based on the correspondence between the reference ambient temperature, the battery temperature, and the second reference curve, where the second target curve represents the change in energy consumption for heating the battery with battery temperature; determining a target temperature based on the first and second target curves, where the slopes of the first and second target curves are consistent; and then controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and a first temperature threshold. In this method, the target battery temperature corresponding to the highest discharge capacity gain is first determined, and then the vehicle battery temperature is controlled based on the target temperature, the first battery temperature, and the first temperature threshold, thereby maximizing the discharge capacity gain of the battery, reducing unnecessary energy loss, and thus reducing the impact on the vehicle's driving range.

[0046] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0047] Figure 1 A schematic diagram illustrating an application scenario provided in an embodiment of this application;

[0048] Figure 2 A flowchart illustrating a method for controlling the temperature of a vehicle battery, as provided in this application embodiment;

[0049] Figure 3 A schematic diagram of a target curve provided for an embodiment of this application;

[0050] Figure 4 A schematic diagram of a slope curve provided for an embodiment of this application;

[0051] Figure 5A schematic diagram of a temperature control device for a vehicle battery provided in an embodiment of this application;

[0052] Figure 6 This is a schematic diagram of a computing device provided in an embodiment of this application. Detailed Implementation

[0053] The terms "first," "second," and "third," etc., used in this application specification and accompanying drawings are used to distinguish different objects, not to limit a specific order.

[0054] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0055] To ensure clarity and conciseness in the description of the following embodiments, a brief introduction to the related technologies is given first:

[0056] New energy vehicles refer to vehicles that use non-traditional fuel as a power source. The main types of new energy vehicles include electric vehicles and hybrid vehicles (including plug-in hybrid vehicles and range-extended hybrid vehicles). However, in low-temperature environments, the chemical reaction rate of the power battery decreases, and the conductivity decreases, leading to a decline in battery performance, reducing the vehicle's discharge capacity, and thus affecting the vehicle's driving range.

[0057] Currently, heating the battery can raise its temperature and mitigate the effects of low temperatures. However, the decision to activate heating is based solely on either the battery's temperature or charge threshold. In some cases, even heating the battery may not effectively reduce the impact of low temperatures, and the power consumed by heating could even further decrease the battery's discharge capacity, thus affecting the vehicle's driving range.

[0058] In view of this, embodiments of this application provide a method for controlling the temperature of a vehicle battery. The method includes: acquiring a first battery temperature of the vehicle, a first ambient temperature of the environment in which the vehicle is located, and a first target curve, wherein the first target curve is a curve showing the change in the vehicle's discharge capacity with battery temperature; acquiring a second target curve corresponding to the first ambient temperature and the first battery temperature based on the correspondence between the reference ambient temperature, the battery temperature, and a second reference curve, wherein the second target curve is a curve showing the change in energy consumption of the vehicle for heating the battery with battery temperature; determining a target temperature based on the first target curve and the second target curve, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent; and then controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and a first temperature threshold.

[0059] In this method, the target temperature of the battery corresponding to the highest discharge capacity is first determined. Then, based on the target temperature, the first battery capacity, and the first temperature threshold, the temperature of the vehicle battery is controlled to maximize the discharge capacity of the battery, reduce unnecessary energy loss, and thus reduce the impact on the vehicle's driving range.

[0060] To make the technical solution of this application clearer and easier to understand, the application scenarios provided by the embodiments of this application will be introduced below with reference to the accompanying drawings. Figure 1 As shown in the figure, this figure is a schematic diagram of an application scenario provided by an embodiment of this application.

[0061] In this application scenario, if vehicle 101 can obtain the first ambient temperature of its environment and the first target curve showing the change in the discharge capacity of vehicle 101's battery 102 with battery temperature, then based on the first ambient temperature, a second target curve is determined showing the change in energy consumption for vehicle 101 to heat battery 102 with battery temperature. When the slopes of the first and second target curves are consistent, it indicates that the discharge capacity gain corresponding to heating battery 102 is maximized, and the corresponding temperature is recorded as the target temperature. Finally, based on this target temperature, the vehicle's first battery temperature, and a first temperature threshold, the temperature of vehicle 101's battery 102 is controlled.

[0062] In this scenario, vehicle 101 does not simply use a temperature threshold as a condition to determine whether to heat battery 102. Instead, it first determines the temperature at which the discharge capacity benefit is maximized when battery 102 is heated, and then controls the temperature of battery 102 of vehicle 101 based on that temperature, the vehicle's first battery temperature, and the first temperature threshold.

[0063] It should be noted that the vehicle battery temperature control method provided in this application embodiment can be executed by the vehicle, by the controller on the vehicle, or by the Battery Management System (BMS). For ease of understanding, the technical solution provided in this application embodiment will be described below from the perspective of the battery management system, in conjunction with the accompanying drawings. Figure 2 As shown, this figure is a flowchart of a vehicle battery temperature control method provided in an embodiment of this application. The method includes:

[0064] S201, BMS acquires the vehicle's first battery temperature, the first ambient temperature of the vehicle's environment, and the first target curve.

[0065] The first battery temperature can be the current temperature of the vehicle's battery, such as the battery temperature obtained by the BMS when executing S201. The BMS can obtain the first battery temperature and the first ambient temperature. For example, the BMS can collect the temperature of the vehicle's battery through a temperature sensor to obtain the first battery temperature, or it can collect the temperature of the environment in which the vehicle is located to obtain the first ambient temperature.

[0066] The first target curve is the curve showing how the vehicle's battery discharge capacity changes with battery temperature. For example... Figure 3 As shown, this figure is a schematic diagram of a target curve provided in an embodiment of this application.

[0067] Among them, curve 301 is the first target curve, from Figure 3 As can be seen, the discharge capacity gradually increases with increasing battery temperature, but the rate of change of the discharge capacity gradually decreases. In other words, at lower temperatures, temperature has a more significant impact on the battery's discharge capacity, while at higher temperatures, the impact is weaker. When the battery temperature rises to a first temperature threshold (e.g., room temperature 25 degrees Celsius), the battery's discharge capacity almost no longer increases with further temperature increases.

[0068] In some examples, curve 301 can be obtained by fitting a pre-measured historical discharge capacity and the corresponding historical battery temperature. For example, the first target curve can be characterized by the following formula:

[0069] Q1 = a1ln(T+b1) + c1

[0070] Where Q1 represents the discharge capacity of the battery at temperature T, and a1, b1, and c1 are parameters obtained through fitting.

[0071] S202, BMS obtains the second target curve corresponding to the first ambient temperature and the first battery temperature based on the correspondence between the reference ambient temperature, battery temperature and the second reference curve.

[0072] The second target curve represents the energy consumption of the vehicle heating the battery as a function of battery temperature. The corresponding second target curve differs depending on the ambient temperature. In some examples, a pre-established correspondence between a reference ambient temperature, battery temperature, and the second reference curve can be established, as shown in Table 1 below.

[0073] Table 1:

[0074] Reference ambient temperature Battery temperature Second reference curve Temperature 11 Temperature 21 Curve 1 Temperature 12 Temperature 22 Curve 2 … … …

[0075] In some examples, second reference curves corresponding to the ambient temperature range and the battery temperature range can be preset. For example, when the ambient temperature range and the battery temperature range are (-20, -15], the corresponding curve is curve 1, and when the ambient temperature range and the battery temperature range are (-15, -10], the corresponding curve is curve 2. This application does not limit the specific form of the above correspondence.

[0076] After obtaining the above correspondence, the BMS can directly determine the second target curve based on the first ambient temperature of the vehicle's environment and the above correspondence.

[0077] The determination of the second target curve is similar to that of the first target curve. The second target curve can be obtained by fitting historical ambient temperatures, the corresponding heating energy consumption at those historical ambient temperatures, and historical battery temperatures. Similarly, the second target curves for each historical ambient temperature can be obtained, thus constructing the aforementioned correspondence. (Continue to see...) Figure 3 Curve 302 is the second target curve, which can be characterized by the following formula:

[0078] Q2=a2T 2 +b2T+c2

[0079] Where Q2 represents the heating energy consumption when the battery temperature is T, and a2, b2 and c2 are parameters obtained by fitting.

[0080] from Figure 3 It can be seen that heating energy consumption is mainly affected by heating to a specified temperature and ambient temperature. The lower the ambient temperature, the higher the energy consumed to heat the battery to that specified temperature, and the greater the rate of energy consumption growth as the specified temperature increases.

[0081] S203 and BMS determine the target temperature based on the first target curve and the second target curve.

[0082] After obtaining the first target curve and the second target curve, the target temperature can be determined based on these two curves. This target temperature is the temperature corresponding to the point where the slopes of the first target curve and the second target curve are the same.

[0083] like Figure 4 As shown, this figure is a schematic diagram of a slope curve provided in an embodiment of this application. Curve 401 is the slope curve of the first target curve (i.e., the curve corresponding to the derivative with respect to Q1), and curve 402 is the slope curve of the second target curve (i.e., the curve corresponding to the derivative with respect to Q2). The intersection point of curves 401 and 402 is the point where the slopes of the first and second target curves are the same, and the temperature corresponding to this intersection point is the aforementioned target temperature. Since the rate of increase of the vehicle's battery discharge capacity gradually decreases as the battery temperature rises, while the rate of increase of energy consumed by heating gradually increases as the specified temperature rises, the benefit of the discharge capacity is maximized when the growth rates of both are equal. Figure 4 It can be determined that the battery's discharge capacity is maximized when the battery temperature is heated to the target temperature.

[0084] S204, BMS controls the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold.

[0085] After obtaining the target temperature, the BMS can control the temperature of the vehicle's battery based on the target temperature, as well as the first battery temperature and the first temperature threshold, including whether to heat the battery and to what temperature.

[0086] The first temperature threshold can refer to the lowest temperature at which the battery's discharge capacity no longer increases significantly with temperature. For example, the first temperature threshold can be 25 degrees Celsius. Once the battery temperature exceeds 25 degrees Celsius, even if the battery temperature rises further, the battery's discharge capacity will no longer increase significantly (e.g., the growth rate is lower than the growth rate threshold).

[0087] The following sections will describe different scenarios, in which the temperature of the first battery is lower than the first temperature threshold, i.e., a low-temperature scenario.

[0088] The first method: If the target temperature is greater than the first temperature threshold and the first battery temperature is less than the first temperature threshold, then the temperature of the vehicle's battery is heated to the first temperature threshold.

[0089] A target temperature exceeding a first temperature threshold indicates that the battery's discharge capacity is maximized at a temperature higher than the first temperature threshold. However, once the battery temperature exceeds this first temperature threshold, the battery's discharge capacity will no longer increase significantly. In this case, the battery temperature can be controlled to be heated to the first temperature threshold, rather than to the target temperature, thereby further reducing unnecessary energy loss.

[0090] The second approach is to not actively heat the vehicle's battery if the target temperature is less than or equal to the first battery temperature, and the first battery temperature is less than the first temperature threshold.

[0091] A target temperature less than or equal to the first battery temperature indicates that the battery's discharge capacity is maximized at a temperature lower than the first battery temperature. In other words, heating the battery at this temperature will continuously decrease its discharge capacity. In this situation, the vehicle no longer actively heats the battery; instead, it utilizes waste heat, which can be heat generated during vehicle operation, such as heat dissipation from electronic components.

[0092] The third method: If the target temperature is greater than the first battery temperature and less than the first temperature threshold, then the vehicle's battery temperature is heated to the target temperature.

[0093] The target temperature being greater than the first battery temperature and less than the first temperature threshold indicates that the temperature at which the battery's discharge capacity gain is maximized is between the first battery temperature and the first temperature threshold. In other words, within the range of the first battery temperature to the first temperature threshold, the battery's discharge capacity gain first increases and then decreases as the battery temperature rises. When the battery temperature rises to the target temperature, the battery's discharge capacity gain reaches its maximum, thereby controlling the battery temperature to be heated to the target temperature.

[0094] In some embodiments, the BMS can also obtain the temperature of the vehicle's battery after temperature control. If the temperature after temperature control is greater than or equal to the minimum of a first temperature threshold and a target temperature, the heating of the vehicle's battery is stopped. The temperature after temperature control can be the temperature of the battery after the heating control is applied.

[0095] Once the battery temperature exceeds a first temperature threshold or the minimum of the target temperature, the gain in discharge capacity will continue to decrease even if the battery is heated, at which point the vehicle will stop active heating. Furthermore, the BMS can utilize waste heat to heat the battery.

[0096] In other embodiments, the BMS can also obtain the battery charge of the vehicle after temperature control, and if the charge after temperature control is less than or equal to a first charge threshold, then heating of the vehicle's battery is stopped.

[0097] The battery level after temperature control can be the remaining battery power after heating. The first battery power threshold can be the minimum battery power value at which battery heating is allowed to be activated. For example, if the battery power is below this first threshold, activating battery heating will not provide any benefit and will instead reduce the vehicle's driving range. This first battery power threshold can also be a user-defined value. When the battery level after temperature control is less than or equal to the first battery power threshold, battery heating is stopped, thereby reducing battery energy loss. Furthermore, the BMS can utilize waste heat to heat the battery.

[0098] In some embodiments, before the BMS acquires the vehicle's first battery temperature, i.e., before S201 described above, the BMS may first acquire the vehicle's second battery temperature and a second temperature threshold. This second temperature threshold is the lowest temperature corresponding to when the vehicle's discharge power is a first preset power. The first preset power can be the maximum power required for driving. To ensure the vehicle has sufficient power in low-temperature environments, the maximum power required for driving can be obtained based on a low-temperature driving curve. The second temperature threshold is the lowest battery temperature that meets the first preset power requirement. This lowest temperature can be determined by a discharge curve. Generally, the second battery temperature is lower than the first battery temperature. For example, the second battery temperature is -20 degrees Celsius, and the first battery temperature is -15 degrees Celsius. The second battery temperature can be the battery temperature before the BMS executes S201.

[0099] If the temperature of the second battery is lower than the second temperature threshold, the BMS heats the vehicle's battery to the second temperature threshold to ensure that the battery can provide the first preset power, thereby ensuring driving safety.

[0100] In some embodiments, after the BMS heats the vehicle's battery to a second temperature threshold, the BMS can also obtain a first remaining charge of the vehicle's battery and a third battery temperature. The first remaining charge may be the remaining charge after heating the vehicle's battery, and the third battery temperature may be the temperature after heating the vehicle's battery to the second temperature threshold (considering that the ambient temperature is low, the battery temperature will change after heating to the second temperature threshold). The third battery temperature may also be the second temperature threshold.

[0101] If the first remaining battery charge is greater than a first battery charge threshold, the first remaining battery charge is less than a second battery charge threshold, and the third battery temperature is less than a first temperature threshold, then S201 described above is executed; otherwise, the vehicle's battery is not actively heated. Furthermore, the BMS can utilize waste heat to heat the battery.

[0102] The second power threshold refers to the remaining power of the battery when its discharge capacity is less affected by temperature. When the remaining power of the battery is greater than the second power threshold, the degree to which the battery's discharge capacity is affected by temperature is low, for example, the degree of influence is lower than the degree threshold.

[0103] The BMS will only execute S201 if the above conditions are met, thereby determining whether to heat the vehicle's battery and to what temperature.

[0104] Based on the above description, this application provides a method for controlling the temperature of a vehicle battery. The method includes acquiring a first battery temperature, a first ambient temperature of the vehicle's environment, and a first target curve. The first target curve is a curve showing the change in the vehicle's discharge capacity with battery temperature. Based on the correspondence between the reference ambient temperature, battery temperature, and a second reference curve, a second target curve is acquired, corresponding to the first ambient temperature and the first battery temperature. This second target curve is a curve showing the change in energy consumption for heating the battery with battery temperature. A target temperature is determined based on the first and second target curves. This target temperature is the temperature corresponding to the slope of the first and second target curves being consistent. Then, based on the first battery temperature, the target temperature, and a first temperature threshold, the temperature of the vehicle battery is controlled to maximize the battery's discharge capacity, reduce unnecessary energy loss, and thus reduce the impact on the vehicle's driving range.

[0105] The above text combined Figures 1 to 4 The temperature control method for vehicle batteries provided in the embodiments of this application has been described in detail. The apparatus and equipment provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0106] See Figure 5 The figure is a schematic diagram of a vehicle battery temperature control device provided in an embodiment of this application. The vehicle battery temperature control device 500 includes:

[0107] The acquisition module 501 is used to acquire the first battery temperature of the vehicle, the first ambient temperature of the environment in which the vehicle is located, and a first target curve, wherein the first target curve is the curve of the discharge capacity of the vehicle's battery changing with the battery temperature; and according to the correspondence between the reference ambient temperature, the battery temperature and the second reference curve, acquire the first ambient temperature and the second target curve corresponding to the first battery temperature, wherein the second target curve is the curve of the energy consumption of the vehicle to heat the battery changing with the battery temperature.

[0108] The determining module 502 is used to determine a target temperature based on the first target curve and the second target curve, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent;

[0109] The control module 503 is used to control the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold.

[0110] In some possible implementations, the control module 503 is specifically configured to heat the temperature of the vehicle's battery to the first temperature threshold if the target temperature is greater than or equal to the first temperature threshold and the first battery temperature is less than the first temperature threshold.

[0111] In some possible implementations, the control module 503 is specifically configured to not actively heat the vehicle's battery if the target temperature is less than or equal to the first battery temperature, and the first battery temperature is less than the first temperature threshold.

[0112] In some possible implementations, the control module 503 is specifically configured to heat the battery of the vehicle to the target temperature if the target temperature is greater than the first battery temperature and the target temperature is less than a first temperature threshold.

[0113] In some possible implementations, the acquisition module 501 is further configured to acquire the temperature of the vehicle's battery after temperature control; the control module 503 is further configured to stop heating the vehicle's battery if the temperature after temperature control is greater than or equal to the minimum of a first temperature threshold and the target temperature; or,

[0114] The acquisition module 501 is also used to acquire the battery charge of the vehicle after temperature control;

[0115] The control module 503 is further configured to stop heating the vehicle's battery if the battery power after temperature control is less than or equal to a first battery power threshold.

[0116] In some possible implementations, the acquisition module 501 is further configured to acquire the second battery temperature of the vehicle and a second temperature threshold, wherein the second temperature threshold is the lowest temperature corresponding to when the discharge power of the vehicle is a first preset power;

[0117] The control module 503 is further configured to heat the vehicle's battery to the second temperature threshold if the second battery temperature is lower than the second temperature threshold.

[0118] In some possible implementations, the acquisition module 501 is further configured to acquire the first remaining charge of the vehicle's battery and the third battery temperature of the vehicle.

[0119] The control module 503 is further configured to perform the step of obtaining the first battery temperature of the vehicle if the first remaining power is greater than the first power threshold, the first remaining power is less than the second power threshold, and the third battery temperature is less than the first temperature threshold; otherwise, the vehicle battery is not actively heated.

[0120] The vehicle battery temperature control device 500 according to the embodiments of this application can correspondingly execute the method described in the embodiments of this application, and the above and other operations and / or functions of each module / unit of the vehicle battery temperature control device 500 are respectively for implementing Figure 2 For the sake of brevity, the corresponding processes of each method in the illustrated embodiments will not be described in detail here.

[0121] This application also provides a computing device. This computing device is specifically used to implement, for example... Figure 5 The embodiment shown illustrates the function of the temperature control device 500 for the vehicle battery.

[0122] like Figure 6 As shown, this figure is a structural schematic diagram of a computing device 600 provided in an embodiment of this application. Figure 6 As shown, the computing device 600 includes a bus 701, a processor 702, a communication interface 703, and a memory 704. The processor 702, the memory 704, and the communication interface 703 communicate with each other via the bus 701.

[0123] The 701 bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0124] The processor 702 can be any one or more of the following processors: central processing unit (CPU), graphics processing unit (GPU), microprocessor (MP), or digital signal processor (DSP).

[0125] The communication interface 703 is used for communication with external devices.

[0126] Memory 704 may include volatile memory, such as random access memory (RAM). Memory 704 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0127] The memory 704 stores executable code, and the processor 702 executes the executable code to perform the aforementioned vehicle battery temperature control method.

[0128] Specifically, in achieving Figure 5 In the case of the illustrated embodiment, and Figure 5 When the modules or units of the vehicle battery temperature control device 500 described in the embodiment are implemented by software, the following steps are performed: Figure 5 The software or program code required for the functions of each module / unit can be partially or wholly stored in the memory 704. The processor 702 executes the program code corresponding to each unit stored in the memory 704 to execute the aforementioned vehicle battery temperature control method.

[0129] This application also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of being stored by a computing device, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the vehicle battery temperature control method described above for the vehicle battery temperature control device 500.

[0130] This application also provides a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this application are generated.

[0131] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0132] When the computer program product is executed by a computer, the computer performs any of the aforementioned methods of the vehicle battery temperature control method. The computer program product can be a software installation package; when any of the aforementioned methods of the vehicle battery temperature control method is required, the computer program product can be downloaded and executed on the computer.

[0133] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0134] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A method for temperature control of a vehicle battery, characterized in that, include: The vehicle's first battery temperature, the first ambient temperature of the environment in which the vehicle is located, and a first target curve are obtained. The first target curve is the curve showing the change in the vehicle's battery discharge capacity with battery temperature. Based on the correspondence between the reference ambient temperature, battery temperature and the second reference curve, the second target curve corresponding to the first ambient temperature and the first battery temperature is obtained. The second target curve is the curve of the energy consumption of the vehicle heating the battery as a function of the battery temperature. Based on the first target curve and the second target curve, a target temperature is determined, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent; The temperature of the vehicle's battery is controlled based on the first battery temperature, the target temperature, and the first temperature threshold.

2. The method according to claim 1, characterized in that, The step of controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes: If the target temperature is greater than or equal to the first temperature threshold and the first battery temperature is less than the first temperature threshold, then the temperature of the vehicle's battery is heated to the first temperature threshold.

3. The method according to claim 1, characterized in that, The step of controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes: If the target temperature is less than or equal to the first battery temperature, and the first battery temperature is less than a first temperature threshold, then the vehicle's battery will not be actively heated.

4. The method according to claim 1, characterized in that, The step of controlling the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold includes: If the target temperature is greater than the first battery temperature and the target temperature is less than the first temperature threshold, then the battery temperature of the vehicle is heated to the target temperature.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: Obtain the temperature of the vehicle's battery after temperature control; if the temperature after temperature control is greater than or equal to the minimum of a first temperature threshold and the target temperature, stop heating the vehicle's battery; or, The battery charge of the vehicle after temperature control is obtained. If the charge charge after temperature control is less than or equal to a first charge threshold, heating of the vehicle's battery is stopped.

6. The method according to claim 1, characterized in that, Prior to obtaining the first battery temperature of the vehicle, the method further includes: The second battery temperature of the vehicle and a second temperature threshold are obtained, wherein the second temperature threshold is the lowest temperature corresponding to the discharge power of the vehicle being a first preset power; If the temperature of the second battery is lower than the second temperature threshold, the battery of the vehicle is heated to the second temperature threshold.

7. The method according to claim 6, characterized in that, After heating the vehicle's battery to the second temperature threshold, the method further includes: Obtain the first remaining battery charge of the vehicle and the third battery temperature of the vehicle; If the first remaining battery power is greater than the first battery power threshold, the first remaining battery power is less than the second battery power threshold, and the third battery temperature is less than the first temperature threshold, then the step of obtaining the first battery temperature of the vehicle is executed; otherwise, the vehicle's battery is not actively heated.

8. A temperature control device for a vehicle battery, characterized in that, include: The acquisition module is used to acquire the first battery temperature of the vehicle, the first ambient temperature of the environment in which the vehicle is located, and a first target curve, wherein the first target curve is the curve of the discharge capacity of the vehicle's battery changing with the battery temperature; and according to the correspondence between the reference ambient temperature, the battery temperature and the second reference curve, acquire the first ambient temperature and the second target curve corresponding to the first battery temperature, wherein the second target curve is the curve of the energy consumption of the vehicle to heat the battery changing with the battery temperature. The determining module is used to determine a target temperature based on the first target curve and the second target curve, wherein the target temperature is the temperature corresponding to the slope of the first target curve and the second target curve being consistent; The control module is used to control the temperature of the vehicle's battery based on the first battery temperature, the target temperature, and the first temperature threshold.

9. A computing device, characterized in that, Including memory and processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method as described in any one of claims 1 to 7.

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