Power battery control method and device, vehicle-mounted controller and vehicle

Abstract

The invention provides a power battery control method and device, a vehicle-mounted controller and a vehicle, and relates to the technical field of vehicle control. The power battery control method comprises the steps that the battery temperature is obtained under the condition that a whole vehicle is started at high voltage, if the battery temperature meets the preset ultralow temperature condition, the discharging power of a battery is controlled to be preset discharging power, and the preset discharging power is larger than zero. By means of the design, power can be supplied to components such as a motor needed for starting the vehicle, so that the vehicle can output power, the vehicle can be started under the preset ultralow temperature condition without depending on external heating equipment or being placed in a garage for heat preservation, and the problem that the vehicle cannot be started due to low temperature in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a power battery control method, a control device, an on-board controller, and a vehicle. Background Art

[0002] Power batteries are significantly affected by temperature, which is one of the core factors affecting their performance, lifespan, and safety. Generally, the optimal operating temperature range for lithium-ion batteries is between 20°C and 30°C. Temperatures that are too high or too low can affect the battery's charge and discharge performance, capacity characteristics, and cycle life. Especially at low temperatures, the chemical reaction rate within the battery slows down, while the electronic conductivity within the battery decreases, significantly increasing the battery's internal resistance. Continuous use under these conditions can shorten the battery's lifespan.

[0003] To ensure the lifespan of the power battery, prior art limits the vehicle's power battery discharge power to 0 kW below a certain temperature limit. In this case, if the vehicle is not connected to an external charger to heat the power battery or is not parked in a garage for insulation, the vehicle will fail to start. Therefore, there is an urgent need to develop a power battery control strategy to effectively address this issue. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a power battery control method, a control device, an on-board controller and a vehicle.

[0005] In a first aspect, the present application provides a power battery control method, including: obtaining the battery temperature when the entire vehicle is started at high voltage; when the battery temperature meets a preset ultra-low temperature condition, controlling the discharge power of the battery to be a preset discharge power, and the preset discharge power is greater than zero.

[0006] In the above technical solution, if the whole vehicle is started at high voltage, the battery temperature is obtained. Determine whether the battery temperature meets the preset ultra-low temperature condition. If the battery temperature meets the preset ultra-low temperature condition, it means that the battery is currently in an extreme ultra-low temperature environment, and the chemical properties of the battery are unstable at this time. According to the existing power battery discharge strategy, due to the limitation of the output power of the power battery, the vehicle will have no power output, for example, the starting of the vehicle cannot be guaranteed. Therefore, in this case, the present application controls the discharge power of the battery to be the preset discharge power, and the preset discharge power is greater than zero. Since the power battery can be discharged according to the preset discharge power under the preset ultra-low temperature condition, the vehicle motor and other components can obtain electric energy to start work, thereby realizing the starting of the vehicle under the preset ultra-low temperature condition.

[0007] Optionally, in some possible implementations, the above control method may further include: obtaining the state of charge of the battery; when the temperature of the battery meets a preset ultra-low temperature condition and the state of charge meets a preset discharge condition, controlling the discharge power of the battery to be a preset discharge power.

[0008] In the above technical solution, the state of charge of the battery can also be obtained. The state of charge of the battery is one of the most critical monitoring indicators in the battery management system, which directly affects the safe use, life management and energy optimization strategy of the battery. Therefore, the discharge capacity of the battery is not only affected by temperature, but SOC is also a key factor. The embodiment of the present application comprehensively considers the impact of multi-parameter coupling on the working performance of the battery. When the temperature of the battery meets the preset ultra-low temperature condition and the state of charge meets the preset discharge condition, the discharge power of the battery is controlled to be the preset discharge power. The fact that the temperature of the battery meets the preset ultra-low temperature condition indicates that the battery is in an extreme low temperature condition at this time. At this time, the present application then determines whether the state of charge meets the preset discharge condition. If the state of charge meets the preset discharge condition, it means that the state of charge of the battery at this time can ensure that the battery can be discharged according to the preset discharge power. This setting can ensure that the battery has the ability to discharge according to the preset discharge power, avoiding the situation where over-discharge causes damage to the battery.

[0009] Optionally, in some possible implementations, the control method may further include:

[0010] Obtain the duration of battery discharge at a preset discharge power;

[0011] When the duration reaches the preset discharge duration, the discharge power of the battery is controlled to decrease to zero according to the preset power gradient;

[0012] When the discharge power of the battery drops to zero, the battery is controlled to discharge according to the battery discharge map.

[0013] In the above technical solution, after the battery discharges at a preset discharge power for a continuous time that reaches a preset discharge time, the present application controls the discharge power of the battery to drop to zero according to a preset power gradient, and then controls the battery to discharge according to the battery discharge map, so as to smoothly switch back to the conventional discharge control strategy. Since the temperature of the battery is relatively low at this time, if it is discharged at the preset discharge power for a long time, it will cause permanent damage to the battery, and even if it is subsequently charged again, it will not be able to restore its previous healthy state. Therefore, the embodiment of the present application can calibrate the preset discharge time of the battery at the preset discharge power in advance. This setting can avoid the problem of the battery being continuously discharged under preset ultra-low temperature conditions, which affects the battery life. The present application controls the battery to discharge at a preset discharge power for a continuous time, and when the continuous time reaches the preset discharge time, controls the discharge power of the battery to drop to zero according to a preset power gradient, and then controls the battery to discharge according to the battery discharge map, so as to smoothly switch back to the conventional discharge control strategy. This setting can avoid the problem of the battery being continuously discharged under preset ultra-low temperature conditions, which affects the battery life. That is, when the battery discharges at a preset discharge power for a preset discharge time, sufficient to start the vehicle, the battery's discharge power is controlled to decrease to zero according to a preset power gradient. The battery then switches to a discharge profile, controlling the battery discharge according to the discharge power optimized by the battery discharge profile to maximize battery performance. Therefore, the present embodiment can achieve the goal of starting the vehicle in extremely low temperatures while also ensuring the life of the power battery.

[0014] Optionally, in some possible implementations, the control method may further include:

[0015] During the duration, the preset power source in the vehicle is requested to start, and the power consumption of other components except the preset power source is restricted; the preset power source includes a fuel engine and / or a fuel cell.

[0016] In the above technical solution, during the period when the battery is controlled to discharge at a preset discharge power, since the battery is in an extremely low-temperature discharge situation, in order to ensure that the energy discharged by the battery during this period is used to start the preset power source, this application limits the power consumption of other components other than the preset power source, so that the energy discharged by the battery at an extremely low temperature is used to start the preset power source in the entire vehicle, thereby ensuring the normal start of the vehicle under such circumstances.

[0017] Optionally, in some possible implementations, the battery temperature meets a preset ultra-low temperature condition, including:

[0018] The lowest temperature of the battery is lower than a first reference temperature, and the first reference temperature is a temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0.

[0019] In the above technical solution, the embodiment of the present application pre-determines the temperature at which the discharge power for all states of charge in the battery discharge map is zero based on the battery discharge map corresponding to the battery, and uses this temperature as the first reference temperature. During high-voltage starting of the vehicle, the battery temperature is obtained in real time. If the lowest battery temperature is less than or equal to the first reference temperature, the discharge power control is no longer performed according to the original battery discharge map. Instead, the battery is controlled to discharge at a preset discharge power greater than zero, enabling the vehicle to start in extremely low temperatures.

[0020] Optionally, in some possible implementations, the battery temperature meets a preset ultra-low temperature condition, further comprising:

[0021] The battery temperature is greater than or equal to a second reference temperature, the second reference temperature is less than the first reference temperature, and a temperature difference between the second reference temperature and the first reference temperature is greater than or equal to 5° C. and / or less than or equal to 10° C.

[0022] In the above technical solution, a temperature range in which the battery temperature meets the preset ultra-low temperature condition can be set, that is, when the lowest temperature of the battery is greater than or equal to the second reference temperature and less than or equal to the first reference temperature, it is determined that the battery temperature meets the preset ultra-low temperature condition. Under this condition, the present application can control the discharge power of the battery to the preset discharge power to achieve vehicle starting. If the lowest temperature of the battery is lower than the second reference temperature, then because the temperature is too low, if the battery is forced to discharge, it may cause irreversible damage to the battery. Therefore, the embodiment of the present application sets a suitable temperature range that meets the preset ultra-low temperature condition, and achieves the normal starting of the vehicle under the preset ultra-low temperature condition on the basis of maximizing the battery life.

[0023] Optionally, in some possible implementations, the state of charge satisfies a preset discharge condition, including:

[0024] The state of charge is greater than or equal to the reference state of charge.

[0025] In the above technical solution, when the SOC is low, the battery may not have sufficient electrical energy to support discharge using the preset discharge power. Therefore, in the embodiment of the present application, when the state of charge is greater than or equal to the reference state of charge and the battery temperature meets the preset ultra-low temperature condition, the discharge power of the battery is controlled to be the preset discharge power, so as to avoid excessive consumption of active lithium and electrolyte at low SOC, increased internal resistance, over-discharge caused by continuous power discharge, and permanent capacity decay.

[0026] In a second aspect, the present application provides a power battery control device, comprising:

[0027] The temperature acquisition module is used to obtain the battery temperature when the vehicle is in high-voltage starting condition;

[0028] The power control module is used to control the discharge power of the battery to be a preset discharge power when the battery temperature meets the preset ultra-low temperature condition, and the preset discharge power is greater than zero.

[0029] Optionally, in some possible implementations, the power control module is also used to obtain the state of charge of the battery; when the battery temperature meets a preset ultra-low temperature condition and the state of charge meets a preset discharge condition, the discharge power of the battery is controlled to be a preset discharge power.

[0030] Optionally, in some possible implementations, the power control module is also used to obtain the duration of the battery's discharge at a preset discharge power; when the duration reaches the preset discharge duration, the discharge power of the battery is controlled to drop to zero according to a preset power gradient; when the discharge power of the battery drops to zero, the battery is controlled to discharge according to the battery discharge map.

[0031] Optionally, in some possible implementations, the power control module is also used to request the start-up of a preset power source in the vehicle within a duration and to limit the power consumption of other components except the preset power source; the preset power source includes a fuel engine and / or a fuel cell.

[0032] Optionally, in some possible implementations, the process of the power control module determining whether the battery temperature meets a preset ultra-low temperature condition may include:

[0033] The lowest temperature of the battery is lower than a first reference temperature, and the first reference temperature is a temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0.

[0034] Optionally, in some possible implementations, the process of the power control module determining whether the battery temperature meets a preset ultra-low temperature condition may further include:

[0035] The battery temperature is greater than or equal to a second reference temperature, the second reference temperature is less than the first reference temperature, and a temperature difference between the second reference temperature and the first reference temperature is greater than or equal to 5° C. and / or less than or equal to 10° C.

[0036] Optionally, in some possible implementations, the process of the power control module determining that the state of charge meets a preset discharge condition includes: the state of charge is greater than or equal to a reference state of charge.

[0037] In a third aspect, the present application provides a vehicle-mounted controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any power battery control method according to the first aspect is implemented.

[0038] In a fourth aspect, the present application provides a vehicle comprising the on-board controller in the third aspect.

[0039] In a fifth aspect, the present application provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a power battery control method provided in the above-mentioned first aspect.

[0040] In a sixth aspect, the present application provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement a power battery control method provided in the first aspect.

[0041] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0042] The embodiment of the present application monitors the battery temperature in real time after the vehicle is started at high voltage. If the battery temperature meets the preset ultra-low temperature condition, it means that the battery is currently in an extreme ultra-low temperature environment. In this case, compared with the related art, the embodiment of the present application no longer uses the forced discharge power corresponding to the original battery discharge map, but controls the discharge power of the battery to be a preset discharge power, and the preset discharge power is greater than zero. Since the battery is discharged according to the preset discharge power at this time, it can supply power to the motor and other components required for vehicle starting. Therefore, the vehicle can have power output, and the vehicle can be started under preset ultra-low temperature conditions without relying on external heating equipment or being placed in the garage for heat preservation, which solves the problem of the vehicle being unable to start due to low temperature in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A battery discharge diagram provided in the related art;

[0046] Figure 2 A schematic flow chart of a power battery control method provided in an embodiment of the present application;

[0047] Figure 3 A flow chart of a specific example of a power battery control method provided in an embodiment of the present application;

[0048] Figure 4This is a schematic structural diagram of a power battery control device provided in an embodiment of the present application;

[0049] Figure 5 A schematic structural diagram of a vehicle-mounted controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] Temperature is one of the core factors affecting the performance, life and safety of power batteries. Its effect runs through the entire chain of battery chemical reaction kinetics, material stability and thermal runaway risk.

[0052] The charging and discharging of power batteries (such as lithium-ion batteries) depends on the migration of ions (such as lithium ions) in the electrolyte. In a low-temperature environment, the viscosity of the electrolyte increases and the ion conduction rate drops significantly, resulting in a sharp increase in the internal resistance of the battery. Although the chemical reaction of the battery slows down at low temperatures, the increase in internal resistance leads to a significant increase in heat generation power. Local overheating may cause uneven temperature distribution inside the battery, which may increase the risk of fire or explosion. Low temperatures will also inhibit the electrochemical reaction rate of the positive and negative active materials in the power battery. For example, the diffusion rate of lithium ions in the electrode material slows down, resulting in a significant reduction in the available capacity of the battery. In addition, gases (such as CO2, H2) or solid deposits produced by side reactions inside the battery will block ion channels, which may cause battery performance to decline or even permanent damage, shortening the battery life.

[0053] In related technologies, in order to ensure the service life of the power battery, the discharge power of the vehicle's power battery is limited to 0 kW when the temperature is below a certain limit. Figure 1 A battery discharge diagram provided in the related art. Figure 1 The battery discharge spectra corresponding to some temperatures are provided for example only. Figure 1 As shown in the figure, when the battery temperature is lower than -30℃, the battery discharge power will be limited to 0KW. For example, when the battery temperature is detected to be lower than -30℃, the power battery controller will forcibly limit the discharge power to 0KW by cutting off the main relay (such as high-voltage contactor) or limiting the battery output current (I=0A), thereby avoiding the problem of battery discharge at low temperatures affecting battery life. Figure 1 At -31℃, the battery's discharge power is 0KW. When the temperature is higher than -31℃, the battery is discharged according to the corresponding discharge power control in the battery discharge map.

[0054] However, starting the vehicle requires the motor to work, and the motor needs to be powered by the battery. If the battery discharge power is limited to 0KW, the battery cannot provide current to the motor, so the motor cannot rotate and the vehicle cannot start, resulting in the so-called stalling phenomenon.

[0055] At this point, the battery's discharge power is limited to 0 kW, and the vehicle cannot start. Without an external charger to heat the battery, it cannot be heated by an external heat source. Since the vehicle cannot start, the vehicle cannot heat the battery. The vehicle's heating system usually requires battery power, but the battery has been restricted from discharging and cannot power the heating system. As a result, the battery remains at its current relatively low temperature, unable to recover, and remains in a restricted discharge state, causing the vehicle to continue to be unable to start.

[0056] In order to solve the above problems, the present application provides a power battery control method. Figure 2 This is a schematic flow chart of a power battery control method provided in an embodiment of the present application. This method can be applied to application scenarios where power battery discharge control is required under low temperature conditions. This method can be executed by a power battery control device provided in an embodiment of the present application. The power battery control device can be implemented in software and / or hardware. For example, it can be a vehicle-mounted controller. Figure 2 As shown, the method includes:

[0057] S101. Obtaining the battery temperature when the vehicle is being started at high voltage.

[0058] After the vehicle is started at high voltage, the high-voltage electricity from the power battery is connected to the vehicle's electrical system, putting the vehicle in a stage ready for starting.

[0059] In power battery systems, accurate monitoring of battery temperature is crucial for ensuring battery safety, lifespan, and performance. After high-voltage starting, the battery enters a discharge state, where temperature impacts discharge efficiency and safety. Real-time temperature monitoring allows for timely adjustment of discharge power to avoid the risk of lithium dendrites at low temperatures or thermal runaway at high temperatures. Real-time battery temperature acquisition after high-voltage starting, and dynamic adjustment of discharge strategies based on this temperature, is a core technical component for achieving safe starting, optimized performance, and longevity in power battery systems.

[0060] In a power battery system, battery temperature can be acquired using a variety of sensor technology solutions, not limited to a specific type of temperature measuring element. For example, the temperature signal can be acquired by:

[0061] Thermistor (NTC / PTC): Utilizing the nonlinear change in resistance of semiconductor materials with temperature, the thermistor converts temperature signals into voltage signals through a voltage divider circuit. This thermistor offers the advantages of low cost, small size, and quick response, making it suitable for distributed deployment of high-density battery packs.

[0062] Thermocouple: Based on the Seebeck effect, it measures temperature through the differential electromotive force between two different conductor materials. It has a wide temperature measurement range and fast response characteristics, and can be used for accurate monitoring of extreme environments or the internal temperature of battery cells.

[0063] Resistance temperature detector: Utilizes the property that the resistance value of metal platinum changes linearly with temperature to achieve high-precision temperature measurement. It is suitable for scenarios with extremely high requirements for temperature stability.

[0064] Since power batteries are usually composed of multiple battery units (such as cells and modules) connected in series or parallel, their temperature field distribution has significant spatial inhomogeneity and dynamic time-varying properties.

[0065] Therefore, the method for determining the battery temperature can be flexibly selected according to actual application requirements, for example:

[0066] By collecting the temperature values of each battery cell, an algorithm such as arithmetic average or weighted average (for example, weights are assigned based on the cell's aging or location importance) is used to generate a characteristic value representing the overall temperature level of the battery pack.

[0067] The lowest or highest temperature in each battery cell is selected as the characteristic value. The lowest temperature can be used as the benchmark for discharge power limitation in low-temperature environments (to avoid the risk of lithium dendrites caused by obstructed lithium ion conduction due to local low temperatures), and the highest temperature can be used as the trigger condition for high-temperature protection (to prevent local overheating from causing thermal runaway). This method prioritizes system safety and is particularly suitable for working conditions with large temperature differences or uneven heat dissipation.

[0068] S102 : When the battery temperature meets a preset ultra-low temperature condition, control the discharge power of the battery to be a preset discharge power, where the preset discharge power is greater than zero.

[0069] In the embodiment of the present application, the battery temperature is monitored in real time. If the battery temperature meets the preset ultra-low temperature condition, it means that the battery is currently in an extreme ultra-low temperature environment. At this time, the chemical properties of the battery are unstable. In order to ensure the service life of the battery, the discharge power is generally set to 0KW in the related art. For example, Figure 1In the embodiment of the present invention, when the temperature is below -30℃, the discharge power of the battery is forced to be set to 0KW. Since the battery has no power output at this time, the motor and other components required for vehicle starting cannot obtain energy, resulting in the vehicle being unable to start. And since there is no external charger to heat the battery at this time, the battery has been in the current temperature state and cannot heat up to jump out of the control logic of the forced discharge power set to 0KW corresponding to the existing battery discharge map, and is always in a restricted discharge state, resulting in the vehicle being unable to start continuously. In this case, compared with the related art, the embodiment of the present application no longer uses the forced discharge power corresponding to the original battery discharge map, but controls the discharge power of the battery to a preset discharge power, and the preset discharge power is greater than zero. Since the battery is discharged according to the preset discharge power at this time, it can supply power to the motor and other components required for vehicle starting, so the vehicle can have power output, and the vehicle can be started under preset ultra-low temperature conditions.

[0070] It should be noted that this application can set a preset ultra-low temperature condition based on actual conditions, such as by setting a temperature threshold. The preset ultra-low temperature condition can be set based on the vehicle's geographical environment, user habits, and the battery's own performance and power. For example, a temperature below -30°C is defined as meeting the preset ultra-low temperature condition.

[0071] It should be noted that the present application can also set the value of the preset discharge power according to actual conditions. For example, the preset discharge power corresponding to the preset ultra-low temperature condition is selected according to the physical and chemical properties of the battery. When selecting the preset discharge power, on the one hand, it is necessary to consider that the preset discharge power cannot be too large. Since the battery is in the preset ultra-low temperature condition, if the preset discharge power is too large, the internal resistance of the battery will increase sharply, causing the battery performance to deteriorate, or even permanent damage, shortening the battery life. On the other hand, when setting the preset discharge power, it is also necessary to consider whether the preset discharge power can meet the energy required for vehicle startup.

[0072] In summary, in the embodiment of the present application, if the detected battery temperature meets the preset ultra-low temperature condition when the whole vehicle is started at high voltage, a special control strategy is executed. The discharge control is no longer performed according to the battery discharge map in the related art, but the discharge power of the battery is controlled to be the preset discharge power. The discharge strategy of the battery under the preset ultra-low temperature condition is added, which allows the user to start the vehicle normally under the preset ultra-low temperature condition without relying on external heating equipment or placing it in the garage for insulation, thereby solving the problem of the vehicle being unable to start due to low temperature in the prior art.

[0073] Furthermore, if the battery temperature does not meet the preset ultra-low temperature condition, it means that under this condition, the normal discharge of the battery based on its chemical properties can meet the vehicle starting requirements, so the discharge can be controlled according to the battery discharge map. The battery discharge map can be a pre-calibrated battery temperature-discharge power correspondence table, which quantifies the safe operating window of the battery in different temperature ranges. The battery discharge power can be dynamically managed through the battery discharge map. The battery discharge map can, for example, be a pre-calibrated temperature-discharge power mapping relationship table, which is stored in the control chip of the battery management system and is used to guide the safe and efficient discharge of the battery in different environments. It is usually calibrated by the battery manufacturer through charge and discharge cycle testing. After obtaining the battery temperature, the battery discharge map can be queried in real time, and the corresponding power limit signal can be output to achieve discharge power regulation by controlling the motor controller or relay.

[0074] Furthermore, after the vehicle is powered on, it will be initialized. After initialization is complete, the temperature flag will be updated. Therefore, after obtaining the battery temperature, the temperature flag can be checked to see if it is valid. If the temperature flag is valid, the obtained battery temperature is used to determine whether the battery temperature meets the preset ultra-low temperature condition. If the temperature flag is invalid, it means that the battery temperature obtained at this time may be the temperature value obtained during the initialization process. This temperature value is unstable, and using this temperature value to subsequently determine whether the preset ultra-low temperature condition is met may result in misjudgment.

[0075] In some optional implementations, the power battery control method provided in the embodiments of the present application may further include:

[0076] Get the battery's state of charge;

[0077] When the temperature of the battery meets a preset ultra-low temperature condition and the state of charge meets a preset discharge condition, the discharge power of the battery is controlled to be the preset discharge power.

[0078] A battery's state of charge (SOC) is a core parameter for measuring a battery's remaining capacity, representing the percentage of the battery's rated capacity at a given moment. It is one of the most critical monitoring indicators in a battery management system, directly impacting battery safety, lifespan management, and energy optimization strategies. Therefore, a battery's discharge capacity is not only affected by temperature; SOC is also a key factor.

[0079] This application incorporates battery temperature and state of charge as dual variables into the control model, forming a three-dimensional correspondence between discharge power, battery temperature, and SOC. This multi-parameter coupled control strategy is closer to the actual operating characteristics of the battery.

[0080] Therefore, in the embodiment of the present application, the influence of multi-parameter coupling on the working performance of the battery is comprehensively considered. The embodiment of the present application also obtains the state of charge of the battery. When the temperature of the battery meets the preset ultra-low temperature condition and the state of charge meets the preset discharge condition, the discharge power of the battery is controlled to be the preset discharge power. The fact that the temperature of the battery meets the preset ultra-low temperature condition indicates that the battery is in an extreme low temperature condition. At this time, the present application further determines whether the state of charge meets the preset discharge condition. If the state of charge meets the preset discharge condition, it means that the state of charge of the battery at this time can ensure that the battery can be discharged according to the preset discharge power and has sufficient energy output, thereby avoiding the situation where the battery is over-discharged due to the state of charge not meeting the preset discharge condition, causing damage to the internal structure of the battery.

[0081] In some optional implementations, the state of charge satisfies a preset discharge condition, including: the state of charge is greater than or equal to a reference state of charge.

[0082] In the embodiment of the present application, a reference state of charge can be pre-set, and the acquired state of charge of the battery can be compared with the reference state of charge. If the acquired state of charge of the battery is greater than or equal to the reference state of charge, it is determined that the state of charge meets the preset discharge condition.

[0083] The reference state of charge can be set according to the battery performance used in the vehicle, for example, the reference state of charge is set to 10%.

[0084] If the state of charge is less than the reference state of charge, it means that the battery is in a low SOC state, and the battery may not have enough power to support discharge at the preset discharge power. In addition, at low SOC, active lithium and electrolyte are consumed more, the internal resistance increases, and continuous power discharge leads to over-discharge, causing permanent capacity decay. Therefore, in the embodiment of the present application, when the state of charge is greater than or equal to the reference state of charge and the battery temperature meets the preset ultra-low temperature conditions, the discharge power of the battery is controlled to the preset discharge power, so as to avoid the problem of active lithium and electrolyte being consumed more at low SOC, the internal resistance increasing, and continuous power discharge leading to over-discharge, causing permanent capacity decay.

[0085] In some optional implementations, the power battery control method provided in the embodiments of the present application further includes:

[0086] Obtain the duration of battery discharge at a preset discharge power;

[0087] When the duration reaches the preset discharge duration, the discharge power of the battery is controlled to decrease to zero according to the preset power gradient;

[0088] When the discharge power of the battery drops to zero, the battery is controlled to discharge according to the battery discharge map.

[0089] In an embodiment of the present application, the duration of the battery discharge at a preset discharge power can be set, for example, the preset discharge duration is set to 30 seconds. At extremely low temperatures, the embodiment of the present application can control the discharge of the battery by adopting a special strategy of discharging at a preset discharge power greater than zero. However, since the temperature of the battery is relatively low at this time, if the battery is discharged at the preset discharge power for a long time, it will cause permanent damage to the battery, and even if it is subsequently recharged, it will not be able to restore the previous healthy state. Therefore, the embodiment of the present application can calibrate the preset discharge duration of the battery at the preset discharge power in advance. When setting the preset discharge duration, it is necessary to consider both ensuring that the vehicle can be started and avoiding the impact of discharge at low temperatures on the battery life. Therefore, in the case where the vehicle can be started, the preset discharge duration should be as short as possible to avoid damage to the battery caused by discharge at low temperatures.

[0090] It should be noted that the preset discharge duration can be calibrated and set based on actual conditions to ensure that the battery discharges at the preset discharge power for a preset discharge duration that ensures sufficient electrical energy to start the vehicle. For example, different preset discharge durations can be set based on the different electrochemical properties of power batteries. When setting the preset discharge duration, a balance can be considered between the battery's chemical properties, safety protection requirements, service life, and the electrical energy required to start the vehicle.

[0091] After the battery discharges at a preset discharge power for a duration that reaches a preset discharge duration, the present application controls the discharge power of the battery to drop to zero according to a preset power gradient, and then controls the battery to discharge according to the battery discharge map, so as to smoothly switch back to the conventional discharge control strategy. This setting can avoid the problem of the battery continuously discharging under preset ultra-low temperature conditions, which affects the battery life. That is, when the battery discharges at a preset discharge power for a preset discharge duration that is sufficient to start the vehicle, the battery discharge power is controlled to drop to zero according to a preset power gradient, and then switched to the battery discharge map for discharge, and the battery discharge is controlled according to the discharge power optimized by calibration of the battery discharge map, thereby maintaining the battery performance to the greatest extent. Therefore, the present application can achieve the effect of starting the vehicle under extremely low temperature conditions by controlling the duration of the battery discharge at a preset discharge power, and when the duration reaches the preset discharge duration, controlling the discharge power of the battery to drop to zero according to a preset power gradient. At the same time, it can also ensure the service life of the power battery.

[0092] Optionally, in an embodiment of the present application, the discharge power of the battery is controlled to drop to zero according to a preset power gradient, rather than directly reducing the discharge power to zero, so as to avoid damage to the battery caused by instantaneous large current changes. Directly cutting off the discharge may generate an arc, which may cause damage to the contact points of the battery interface and connector. At the end of discharge, the internal resistance of the battery itself will increase. If the power is suddenly cut off, there may be a voltage mutation, affecting the battery life, and even triggering the malfunction of the protection circuit. In the chemical reaction process of the battery, the sudden cessation of discharge may cause uneven ion distribution, especially in solid-state batteries or lithium-ion batteries, which may cause local stress and affect the battery performance in the long run. The present application controls the discharge power of the battery to drop to zero according to a preset power gradient, so that the chemical reaction can gradually stabilize and reduce the occurrence of side reactions.

[0093] It should be noted that the above-mentioned preset power gradient can be predefined according to actual conditions (such as battery performance, etc.), for example, the discharge power of the battery is controlled to decrease to zero according to a gradient of 5KW / S.

[0094] In some optional implementations, the power battery control method provided in the embodiments of the present application further includes:

[0095] During the duration, the preset power source in the vehicle is requested to start, and the power consumption of other components except the preset power source is restricted.

[0096] The preset power source includes a fuel engine and / or a fuel cell.

[0097] When the engine or fuel cell starts, it requires a high instantaneous current (such as from the starter, fuel cell air compressor, and stack preheater). Simultaneously allowing other non-essential components (such as air conditioning, seat heating, and in-car entertainment systems) to draw power can cause a sudden increase in the instantaneous load on the battery (such as the power battery and starting battery). If the battery's output capacity is insufficient, the terminal voltage may drop below the starting threshold, resulting in a startup failure or extended startup time, impacting system reliability.

[0098] At this point, the battery temperature meets the preset ultra-low temperature condition, indicating that the battery output capacity itself has significantly decreased (such as the power battery's internal resistance increases and capacity decays at low temperatures). If non-essential loads are not restricted at this time, the risk of startup failure will increase exponentially. For example, the fuel cell system needs to preheat the stack when starting at low temperatures. If a high-power air conditioner is running at the same time, the stack may freeze and be damaged due to insufficient energy. Or after the engine is started, the battery may be unable to maintain idle speed due to low power, causing the vehicle to break down.

[0099] Therefore, in the embodiment of the present application, during the period when the battery is controlled to discharge at a preset discharge power, since the battery is in an extremely low-temperature discharge situation, in order to ensure that the energy discharged by the battery during this period is used to start the preset power source, the present application limits the power consumption of other components other than the preset power source, so that the energy discharged by the battery at an extremely low temperature is used to start the preset power source in the entire vehicle, thereby ensuring the normal start of the vehicle under such circumstances.

[0100] The embodiments of the present application can be applied to fuel vehicles, fuel cell vehicles (such as hydrogen fuel cell vehicles) or hybrid vehicles, so the preset power source may include a fuel engine and / or a fuel cell. For fuel vehicles, the preset power source may include a fuel engine. For fuel cell vehicles, the preset power source may include a fuel cell. For hybrid vehicles, the preset power source may include a fuel engine and a fuel cell. After the fuel engine and / or fuel cell are started, the fuel engine and / or fuel cell can be used to power the vehicle and provide energy for other electrical devices in the vehicle.

[0101] In some optional embodiments, the battery temperature meets a preset ultra-low temperature condition, including:

[0102] The lowest temperature of the battery is lower than a first reference temperature, and the first reference temperature is a temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0.

[0103] The embodiment of the present application determines whether the battery temperature meets the preset ultra-low temperature condition by setting a first reference temperature. The first reference temperature is the temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0. In the embodiment of the present application, the temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0 can be found and used as the first reference temperature. In the related art, if the battery temperature is the first reference temperature, then according to the battery discharge map, the battery discharge power of the vehicle will be limited to 0KW. The embodiment of the present application will determine in advance the temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0 based on the battery discharge map corresponding to the battery, and use it as the first reference temperature. When the whole vehicle is started at high voltage, the battery temperature is obtained in real time. If the lowest temperature of the battery is less than or equal to the first reference temperature, the discharge power control is no longer performed according to the original battery discharge map. Instead, the battery is controlled to discharge at a preset discharge power greater than zero, so that the vehicle can be started in extremely low temperature conditions.

[0104] The battery includes multiple battery cells, and the problem of uneven temperature distribution within the battery pack is taken into consideration. The temperature of different cells may vary due to factors such as location, contact conditions, and degree of aging. In the embodiment of the present application, the lowest battery temperature is used to determine whether the battery temperature meets the preset ultra-low temperature condition, with the most fragile battery cell as the benchmark. On the one hand, this can avoid the problem of over-discharge of the battery cell with the lowest temperature caused by setting the average temperature. On the other hand, the average temperature change lags behind the local low temperature point, which may cause control delays.

[0105] It should be noted that the embodiments of this application are based on Figure 1 The battery discharge graph shown is used as an example to describe the setting of the first reference temperature. In other embodiments, since different batteries have different battery discharge graphs, the first reference temperature may be different.

[0106] In some optional embodiments, the battery temperature meets the preset ultra-low temperature condition, further comprising:

[0107] The lowest temperature of the battery is greater than or equal to a second reference temperature, the second reference temperature is less than the first reference temperature, and a temperature difference between the second reference temperature and the first reference temperature is greater than or equal to 5° C. and / or less than or equal to 10° C.

[0108] In an embodiment of the present application, a temperature range can be set for the battery temperature to meet the preset ultra-low temperature condition, that is, when the lowest temperature of the battery is greater than or equal to the second reference temperature and less than the first reference temperature, it is determined that the battery temperature meets the preset ultra-low temperature condition. Under this condition, the present application can control the discharge power of the battery to the preset discharge power to start the vehicle. If the lowest temperature of the battery is less than the second reference temperature, at this time, because the temperature is too low, if the battery is forced to discharge, it may cause irreversible damage to the battery. Therefore, the embodiment of the present application sets a suitable temperature range that meets the preset ultra-low temperature condition, and realizes the normal start of the vehicle under the preset ultra-low temperature condition on the basis of maximizing the battery life.

[0109] Specifically, the temperature difference between the second reference temperature and the first reference temperature can be set to be greater than or equal to 5°C and / or less than or equal to 10°C, that is, the temperature range that meets the preset ultra-low temperature condition can span 5°C to 10°C. The advantage of this setting is that it avoids problems such as damage to the electrode material structure and permanent battery capacity degradation caused by battery discharge when the lower limit of the preset ultra-low temperature condition is too low.

[0110] In order to more clearly illustrate the technical solution provided by the embodiment of the present application, Figure 3 The power battery control method provided in this application is further described. Figure 3 As shown, the power battery control method provided in the embodiment of the present application includes:

[0111] S201, high voltage electricity on the whole vehicle.

[0112] S202: Obtain battery temperature and battery state of charge.

[0113] In the embodiment of the present application, when it is determined that the temperature flag is valid, the lowest temperature of the plurality of battery cells in the power battery detected is used as the battery temperature for subsequent determination.

[0114] S203 , determining whether the battery temperature is within a temperature range of greater than or equal to -35° C. and less than -30° C., and at the same time, the SOC is greater than or equal to 10%.

[0115] If the battery temperature is between -35°C and -30°C, and the SOC is greater than or equal to 10%, execute S205; otherwise, execute S204.

[0116] In this embodiment, the battery temperature is determined to meet the preset ultra-low temperature condition if it is within the temperature range of -35°C to -30°C. If the battery temperature is within the temperature range of -35°C to -30°C and the SOC is greater than or equal to 10%, the special power battery discharge strategy of this application is implemented. Otherwise, discharge is carried out according to the battery discharge map.

[0117] S204: Control the battery to discharge according to the battery discharge map.

[0118] The battery discharge map is a pre-calibrated table of battery temperature-discharge power correspondence, which quantifies the safe operating window of the battery in different temperature ranges. The battery discharge map can also take into account the battery's state of charge, such as Figure 1 If the battery temperature is not greater than or equal to -35°C and less than -30°C, the battery discharge map is used to directly search for the current battery temperature and battery state of charge corresponding to the discharge power, and then the battery is controlled to discharge according to the corresponding discharge power.

[0119] S205: Control the battery's discharge power to 10 kW for 30 seconds. Request the vehicle's fuel engine and / or fuel cell to start, and limit power consumption of all components except the fuel engine and / or fuel cell.

[0120] This embodiment of the application determines, based on the battery's physical and chemical properties, that the preset discharge power is 10 kW when the battery temperature meets the preset ultra-low temperature condition. Taking into account both ensuring the vehicle can start and minimizing the impact of low-temperature discharge on battery life, the preset discharge duration for the battery at 10 kW is set to 30 seconds.

[0121] S206: Determine whether the battery discharge duration reaches 30 seconds.

[0122] If yes, execute S204; otherwise, return to execute S205.

[0123] In an embodiment of the present application, after the high voltage is applied to the vehicle, the battery temperature is monitored in real time. If the battery temperature is between -35°C and -30°C, and the SOC is greater than or equal to 10%, a special discharge strategy is selected: the battery discharge power is controlled to 10 kW and the discharge is continued for 30 seconds. During the discharge period when the battery discharge power is controlled to 10 kW, the fuel engine and / or fuel cell in the vehicle is requested to start. After successful startup, the fuel engine can directly drive the vehicle, and the fuel cell can discharge to provide power to other electrical components. During this period, the power consumption of other components other than the fuel engine and / or fuel cell is restricted, for example, the power consumption of other high-voltage components of the vehicle is restricted to ensure that the fuel engine and / or fuel cell have sufficient power to start. Compared to the related art, the embodiment of the present application no longer uses the forced discharge power corresponding to the original battery discharge map, but controls the battery discharge power to a preset discharge power greater than zero under preset ultra-low temperature conditions. Since the battery is discharged at a preset discharge power greater than zero at this time, it can supply power to the motor and other components required for starting the vehicle. Therefore, the vehicle can have power output, and the vehicle can be started under preset ultra-low temperature conditions without relying on external heating equipment or being kept warm in the garage, which solves the problem of the vehicle being unable to start due to low temperature in the prior art. During the discharge period, in order to ensure that the energy discharged by the battery during this period is used to start the fuel engine and / or fuel cell, the present application limits the power consumption of other components other than the fuel engine and / or fuel cell, so that the energy discharged by the battery at extremely low temperatures is used to start the fuel engine and / or fuel cell in the entire vehicle, so that the fuel engine and / or fuel cell can directly drive the vehicle after starting, and can also provide power for other power-consuming components.

[0124] In addition, the present application also provides a power battery control device. Figure 4 As shown, Figure 4 : is a schematic structural diagram of a power battery control device provided in an embodiment of the present application, the device comprising:

[0125] The temperature acquisition module 301 is used to obtain the battery temperature when the vehicle is in high-voltage starting state;

[0126] The power control module 302 is configured to control the discharge power of the battery to be a preset discharge power when the battery temperature meets a preset ultra-low temperature condition, and the preset discharge power is greater than zero.

[0127] The power battery control device provided in an embodiment of the present application implements a special control strategy when the detected battery temperature meets a preset ultra-low temperature condition during a vehicle high-voltage start. Instead of controlling discharge according to the battery discharge map used in related art, the device controls the battery's discharge power to a preset discharge power. This adds a discharge strategy for the battery under preset ultra-low temperature conditions, allowing users to start their vehicles normally under these conditions without relying on external heating equipment or keeping the battery warm in a garage. This solves the problem of vehicles being unable to start due to low temperatures in the prior art. If the battery temperature does not meet the preset ultra-low temperature condition, it indicates that the battery can meet the vehicle starting requirements under these conditions by normal discharge based on its chemical properties. Therefore, discharge control can be performed according to the battery discharge map. The battery discharge map can be a pre-calibrated battery temperature-discharge power mapping table that quantifies the battery's safe operating window in different temperature ranges. The battery discharge map can be used to dynamically manage the battery's discharge power. For example, the battery discharge map can be a pre-calibrated temperature-discharge power mapping table stored in the battery management system's control chip to guide the battery's safe and efficient discharge under different conditions. It is typically calibrated by battery manufacturers through charge and discharge cycle testing. After obtaining the battery temperature, the battery discharge spectrum can be queried in real time, the corresponding power limit signal can be output, and the discharge power can be adjusted by controlling the motor controller or relay.

[0128] In some optional embodiments, the power control module is also used to obtain the state of charge of the battery; when the battery temperature meets the preset ultra-low temperature condition and the state of charge meets the preset discharge condition, the discharge power of the battery is controlled to be the preset discharge power.

[0129] In some optional embodiments, the power control module is also used to obtain the duration of the battery's discharge at a preset discharge power; when the duration reaches the preset discharge duration, the battery's discharge power is controlled to drop to zero according to a preset power gradient; when the battery's discharge power drops to zero, the battery is controlled to discharge according to the battery discharge map.

[0130] In some optional embodiments, the power control module is also used to request the start-up of a preset power source in the vehicle within a duration and to limit the power consumption of other components except the preset power source; the preset power source includes a fuel engine and / or a fuel cell.

[0131] In some optional implementations, the process of the power control module determining that the battery temperature meets the preset ultra-low temperature condition may include:

[0132] The lowest temperature of the battery is lower than a first reference temperature, and the first reference temperature is a temperature at which the discharge power corresponding to all states of charge in the battery discharge map is 0.

[0133] In some optional implementations, the process of the power control module determining that the battery temperature meets the preset ultra-low temperature condition may further include:

[0134] The battery temperature is greater than or equal to a second reference temperature, the second reference temperature is less than the first reference temperature, and a temperature difference between the second reference temperature and the first reference temperature is greater than or equal to 5° C. and / or less than or equal to 10° C.

[0135] In some optional implementations, the process of the power control module determining whether the state of charge meets a preset discharge condition includes: the state of charge is greater than or equal to a reference state of charge.

[0136] Regarding the apparatus in the above embodiment, the specific manner in which each unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0137] Figure 5 This is a schematic diagram of the structure of an on-board controller provided in an embodiment of the present application. The on-board controller includes: a memory 401, a processor 402, and a computer program 4011 stored in the memory 401 and executable on the processor 402. The processor 402 is configured to implement the power battery control method described in any of the above embodiments when executing the computer program.

[0138] In this embodiment, the vehicle controller can be divided into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific functional module, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used.

[0139] It is understood that the memory 401 in this embodiment can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memory. In some embodiments, the memory 401 stores the following elements: executable units or data structures, or their subsets, or their extended sets, operating systems and applications. In the embodiment of the present disclosure, the processor 402 executes the steps of each embodiment of the method provided in the embodiment of the present disclosure by calling the program or instructions stored in the memory 401.

[0140] The method provided in the embodiment of the present disclosure can be applied to the processor 402, or implemented by the processor 402. The processor 402 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by an integrated logic circuit of hardware in the processor 402 or an instruction in the form of software. The above-mentioned processor 402 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0141] The steps of the method provided in the embodiments of the present disclosure can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software units in the decoding processor. The software units can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in memory 401, and processor 402 reads the information in memory 401 and, in conjunction with its hardware, completes the steps of the method.

[0142] It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0143] The vehicle-mounted controller provided in this embodiment is used to execute the above-mentioned power battery control method, and thus can achieve the same effect as the above-mentioned implementation method.

[0144] When an integrated unit is used, the power battery control method may include a processing module and a storage module. The processing module may be used to control and manage the actions of the vehicle controller, while the storage module may be used to support the vehicle controller in executing mutual program codes and data.

[0145] The processing module may be a processor or controller that implements or executes various exemplary logic blocks, modules, and circuits disclosed herein. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processing (DSP) and a microprocessor, and the storage module may be a memory.

[0146] This embodiment also provides a vehicle, comprising the on-board controller in any of the above embodiments.

[0147] This embodiment also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a power battery control method provided by the above embodiment.

[0148] Computer readable storage media can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0149] This embodiment further provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement a power battery control method provided in the above embodiment.

[0150] The computer program product may be written in any combination of one or more programming languages to implement the operations of embodiments of the present invention, including object-oriented programming languages such as Java, C++, and conventional procedural programming languages such as C or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0151] Among them, the beneficial effects of the above embodiments can refer to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0152] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0153] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be coupled or communicated, which can be electrical, mechanical or other forms. They can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0154] In the description of the present disclosure, it should be understood that if the terms "up", "down", "front", "back", "left" and "right" are used to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present disclosure.

[0155] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. It should also be noted that the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, commodity, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, commodity, or device comprising the element.

[0156] The above are merely examples of the present disclosure and are not intended to limit the present disclosure. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure are intended to be included within the scope of the claims of the present disclosure.

Claims

1. A power battery control method, characterized in that: include: Obtain the battery temperature when the vehicle is starting at high voltage; When the battery temperature meets a preset ultra-low temperature condition, the discharge power of the battery is controlled to be a preset discharge power, and the preset discharge power is greater than zero.

2. The power battery control method according to claim 1, characterized in that: The control method further includes: Obtaining a state of charge of the battery; When the temperature of the battery meets a preset ultra-low temperature condition and the state of charge meets a preset discharge condition, the discharge power of the battery is controlled to be the preset discharge power.

3. The power battery control method according to claim 1 or 2, characterized in that: The control method further includes: Obtaining a duration during which the battery discharges at the preset discharge power; When the duration reaches a preset discharge duration, controlling the discharge power of the battery to decrease to zero according to a preset power gradient; When the discharge power of the battery drops to zero, the battery is controlled to discharge according to a battery discharge map.

4. The power battery control method according to claim 3, characterized in that: The control method further includes: During the duration, a preset power source in the vehicle is requested to start, and power consumption of other components except the preset power source is restricted; the preset power source includes a fuel engine and / or a fuel cell.

5. The power battery control method according to claim 1 or 2, characterized in that: The battery temperature meets the preset ultra-low temperature condition, including: The lowest temperature of the battery is lower than a first reference temperature, where the first reference temperature is a temperature at which the discharge power corresponding to all states of charge in a battery discharge map is 0.

6. The power battery control method according to claim 5, characterized in that: The battery temperature meets the preset ultra-low temperature condition, further comprising: The lowest temperature of the battery is greater than or equal to a second reference temperature, the second reference temperature is less than the first reference temperature, and a temperature difference between the second reference temperature and the first reference temperature is greater than or equal to 5°C and / or less than or equal to 10°C.

7. The power battery control method according to claim 2, characterized in that: The state of charge satisfies a preset discharge condition, including: The state of charge is greater than or equal to a reference state of charge.

8. A power battery control device, characterized in that: include: The temperature acquisition module is used to obtain the battery temperature when the vehicle is in high-voltage starting condition; The power control module is used to control the discharge power of the battery to be a preset discharge power when the battery temperature meets a preset ultra-low temperature condition, and the preset discharge power is greater than zero.

9. A vehicle-mounted controller, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the power battery control method according to any one of claims 1 to 7 when executing the computer program.

10. A vehicle, characterized in that: Including the vehicle-mounted controller according to claim 9.

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