Power battery control methods, control devices, on-board controllers, and vehicles

Abstract

This application provides a power battery control method, control device, vehicle controller, and vehicle, relating to the field of vehicle control technology. The power battery control method includes acquiring the battery temperature during high-voltage starting of the vehicle. If the battery temperature meets a preset ultra-low temperature condition, the battery discharge power is controlled to a preset discharge power, wherein the preset discharge power is greater than zero. This design can supply power to components such as the motor required for vehicle starting, thus enabling the vehicle to have power output and achieve vehicle starting under preset ultra-low temperature conditions without relying on external heating equipment or insulation in a garage, solving the problem of vehicle starting failure due to low temperatures in existing technologies.

Description

Technical Field

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

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

[0003] In related technologies, to ensure the lifespan 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. At this point, if the vehicle does not have an external charger to heat the power battery, or if the vehicle is not parked in a garage for insulation, the vehicle will not be able to start. Therefore, there is an urgent need to develop a power battery control strategy to effectively solve the above problems. Summary of the Invention

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

[0005] In a first aspect, this application provides a power battery control method, comprising: acquiring the battery temperature under high-voltage start-up conditions of the vehicle; and controlling the battery discharge power to a preset discharge power when the battery temperature meets preset ultra-low temperature conditions, wherein the preset discharge power is greater than zero.

[0006] In the above technical solution, if the vehicle undergoes high-voltage starting, the battery temperature is acquired. It is then determined whether the battery temperature meets a preset ultra-low temperature condition. If the battery temperature meets the preset ultra-low temperature condition, it indicates that the battery is currently in an extreme ultra-low temperature environment, where the battery's chemical properties are unstable. If the existing power battery discharge strategy is followed, the vehicle will have no power output due to the power battery's output power limitation, for example, the vehicle cannot be started. Therefore, in this application, under such circumstances, the battery discharge power is controlled to a preset discharge power, and this preset discharge power is greater than zero. Because the power battery can discharge according to the preset discharge power under this preset ultra-low temperature condition, the vehicle's motor and other components can obtain electrical energy to start, thus achieving vehicle starting under the preset ultra-low temperature condition.

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

[0008] The above technical solution can also acquire the battery's state of charge (SOC). SOC is one of the most critical monitoring indicators in a battery management system, directly affecting battery safety, lifespan management, and energy optimization strategies. Therefore, battery discharge capacity is affected not only by temperature but also by SOC. This application embodiment comprehensively considers the impact of multi-parameter coupling on battery performance. When the battery temperature meets a preset ultra-low temperature condition and the SOC meets a preset discharge condition, the battery's discharge power is controlled to a preset discharge power. The battery temperature meeting the preset ultra-low temperature condition indicates that the battery is at an extreme low temperature. At this point, this application further determines whether the SOC meets the preset discharge condition. If the SOC does not meet the preset discharge condition, it means that the battery's SOC can ensure that the battery can discharge at the preset discharge power. This setting ensures that the battery has the ability to discharge at the preset discharge power, avoiding over-discharge that could damage the battery.

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

[0010] Obtain the duration for which the battery discharges at a preset discharge power;

[0011] When the duration of discharge 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 battery's discharge power drops to zero, the battery is controlled to discharge according to the battery discharge pattern.

[0013] In the above technical solution, after the battery discharges at a preset discharge power for a preset duration, this application controls the battery's discharge power to decrease to zero according to a preset power gradient, and then controls the battery to discharge according to the battery discharge pattern, so as to smoothly switch back to the conventional discharge control strategy. Since the battery temperature is low at this time, prolonged discharge at the preset discharge power would cause permanent damage to the battery, and even subsequent recharging would not restore its previous healthy state. Therefore, this application embodiment can pre-calibrate the preset discharge duration at the preset discharge power. This setting can avoid the problem of continuous discharge under preset ultra-low temperature conditions, which affects battery life. This application controls the battery to discharge at a preset discharge power for a preset duration, and when the preset discharge duration is reached, controls the battery's discharge power to decrease to zero according to a preset power gradient, and then controls the battery to discharge according to the battery discharge pattern, so as to smoothly switch back to the conventional discharge control strategy. This setting can avoid the problem of continuous discharge under preset ultra-low temperature conditions, which affects battery life. In other words, when the battery discharges at a preset discharge power for a preset discharge time, sufficient to start the vehicle, the battery discharge power is controlled to decrease to zero according to a preset power gradient. Then, the system switches to a battery discharge profile for further discharge, controlling the battery discharge with optimized discharge power based on the battery discharge profile to maximize battery performance. Therefore, the embodiments of this application can achieve both vehicle starting under extreme low-temperature conditions and ensure the lifespan of the power battery.

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

[0015] During the duration, a request is made to start the preset power source in the vehicle and to restrict the power consumption of other components besides the preset power source; the preset power source includes a combustion engine and / or a fuel cell.

[0016] In the above technical solution, during the period when the battery is discharging at a preset discharge power, the battery is in an extreme low temperature discharge condition. In order to ensure that the energy discharged by the battery during this period can start the preset power source, this application restricts the power consumption of other components other than the preset power source, so that the energy of the battery discharging at the extreme low temperature can be used to start the preset power source in the vehicle, and ensure the normal start of the vehicle under such conditions.

[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 the first reference temperature, which is the temperature at which the discharge power of all states of charge is 0 in the battery discharge spectrum.

[0019] In the above technical solution, this embodiment pre-determines the temperature at which the discharge power for all states of charge in the battery discharge spectrum is 0, based on the battery discharge spectrum corresponding to the battery, and uses this temperature as the first reference temperature. During high-voltage starting of the vehicle, the battery temperature is acquired in real time. If the lowest battery temperature is less than or equal to the first reference temperature, the discharge power is no longer controlled according to the original battery discharge spectrum. Instead, the battery is controlled to discharge at a preset discharge power greater than zero, enabling the vehicle to start under extremely low temperatures.

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

[0021] The battery temperature is greater than or equal to the second reference temperature, the second reference temperature is less than the first reference temperature, and the 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 that satisfies the preset ultra-low temperature condition can be set for the battery temperature. Specifically, the battery temperature is determined to meet the preset ultra-low temperature condition when its lowest temperature is greater than or equal to a second reference temperature and less than or equal to a first reference temperature. Under this condition, this application can control the battery's discharge power to a preset discharge power to achieve vehicle starting. If the battery's lowest temperature is less than the second reference temperature, the temperature is too low, and forcibly controlling the battery to discharge may cause irreversible damage. Therefore, this application embodiment sets a suitable temperature range that meets the preset ultra-low temperature condition, maximizing battery life while achieving normal vehicle starting under the preset ultra-low temperature condition.

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

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

[0025] In the above technical solutions, at low SOC, the battery may not have enough electrical energy to support discharge using the preset discharge power. Therefore, in this application embodiment, 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 to avoid excessive consumption of active lithium and electrolyte at low SOC, increased internal resistance, and over-discharge caused by continuous power discharge, resulting in permanent capacity decay.

[0026] Secondly, this application provides a power battery control device, comprising:

[0027] The temperature acquisition module is used to acquire the battery temperature when the vehicle is starting under high voltage conditions;

[0028] The power control module is used to control the battery's discharge power to a preset discharge power when the battery temperature meets the preset ultra-low temperature conditions. 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; and when the battery temperature meets the preset ultra-low temperature condition and the state of charge meets the preset discharge condition, control the battery discharge power to the preset discharge power.

[0030] Optionally, in some possible implementations, the power control module is further configured to acquire the duration for which the battery discharges at a preset discharge power; when the duration reaches the preset discharge duration, control the battery discharge power to decrease to zero according to a preset power gradient; when the battery discharge power decreases to zero, control the battery to discharge according to the battery discharge pattern.

[0031] Optionally, in some possible implementations, the power control module is also used to request the start of a preset power source in the vehicle for a continuous period of time, and to limit the power consumption of other components besides 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 by which the power control module determines that the battery temperature meets a preset ultra-low temperature condition may include:

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

[0034] Optionally, in some possible implementations, the process by which the power control module determines that the battery temperature meets the preset ultra-low temperature conditions may further include:

[0035] The battery temperature is greater than or equal to the second reference temperature, the second reference temperature is less than the first reference temperature, and the 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 by which the power control module determines that the state of charge meets the preset discharge conditions includes: the state of charge being greater than or equal to the reference state of charge.

[0037] Thirdly, this application provides an on-board controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the power battery control methods described in the first aspect.

[0038] Fourthly, this application provides a vehicle including the on-board controller described in the third aspect.

[0039] Fifthly, this application provides a computer-readable storage medium storing computer program code, which, when executed on a computer, causes the computer to perform the aforementioned related method steps to implement the power battery control method provided in the first aspect.

[0040] Sixthly, this application provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement the power battery control method provided in the first aspect.

[0041] The technical solution provided in this application has the following advantages compared with the prior art:

[0042] This application embodiment monitors the battery temperature in real time after the vehicle undergoes a high-voltage start-up. If the battery temperature meets the preset ultra-low temperature conditions, it indicates that the battery is currently in an extreme ultra-low temperature environment. In this case, compared to related technologies, this application embodiment no longer uses the forced discharge power corresponding to the original battery discharge pattern, but instead controls the battery discharge power to a preset discharge power, and the preset discharge power is greater than zero. Since the battery discharges according to the preset discharge power, it can supply power to the motor and other components required for vehicle starting. Therefore, the vehicle can have power output, realizing the starting of the vehicle under the preset ultra-low temperature conditions, without relying on external heating equipment or placing it in a garage for insulation. This solves the problem of vehicles failing to start due to low temperatures in the prior art. Attached Figure Description

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

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a battery discharge pattern provided in related technologies;

[0046] Figure 2 A schematic flowchart illustrating a power battery control method provided in an embodiment of this application;

[0047] Figure 3 A flowchart illustrating a specific example of a power battery control method provided in this application embodiment;

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

[0049] Figure 5 This is a schematic diagram of the structure of an on-board controller provided in an embodiment of this application. Detailed Implementation

[0050] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0051] Temperature is one of the core factors affecting the performance, lifespan, and safety of power batteries, and its influence extends throughout 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. At low temperatures, electrolyte viscosity increases, and the ion conductivity decreases significantly, leading to a sharp increase in battery internal resistance. Although battery chemical reactions slow down at low temperatures, the increased internal resistance results in a significant increase in heat generation. Localized overheating can cause uneven temperature distribution within the battery, increasing the risk of fire or explosion. Low temperatures also inhibit the electrochemical reaction rates of the positive and negative electrode active materials in power batteries. For example, the diffusion rate of lithium ions in electrode materials slows down, leading to a significant reduction in usable battery capacity. Furthermore, gases (such as CO2 and H2) or solid deposits generated by side reactions inside the battery can block ion channels, potentially causing battery performance degradation or even permanent damage, shortening battery life.

[0053] In related technologies, to ensure the lifespan of the power battery, the discharge power of the vehicle's power battery is limited to 0KW when the temperature is below a certain limit. Figure 1 This is a battery discharge pattern provided in related technologies. Figure 1 Only a subset of battery discharge profiles corresponding to certain temperatures are provided as examples. For instance... Figure 1 As shown, when the battery temperature is below -30℃, the battery discharge power will be limited to 0kW. For example, when the battery temperature is detected to be below -30℃, the power battery controller will forcibly limit the discharge power to 0kW by disconnecting the main relay (such as a high-voltage contactor) or limiting the battery output current (I=0A), thereby avoiding the problem of battery life being affected by low-temperature discharge. See also Figure 1 At -31℃, the battery's discharge power is 0KW. At temperatures above -31℃, the battery discharges according to the corresponding discharge power in the battery discharge spectrum.

[0054] However, starting a vehicle requires the electric motor to operate, and the electric motor needs power from the battery. If the battery's discharge power is limited to 0kW, the battery cannot provide current to the motor, so the motor cannot turn, the vehicle cannot start, and this is commonly known as a breakdown.

[0055] At this point, the battery's discharge power is limited to 0kW, and the vehicle cannot start. Without an external charger to heat the battery, it cannot be heated by an external heat source, and since the vehicle cannot start, it cannot heat the battery either. The vehicle's heating system typically requires battery power, but the battery is already under discharge limitation and cannot supply power to the heating system. Therefore, the battery remains at its current low temperature, unable to rise, and remains in a limited discharge state, causing the vehicle to remain unable to start.

[0056] To address the aforementioned issues, this application provides a power battery control method. Figure 2 This is a schematic flowchart illustrating a power battery control method provided in an embodiment of this application. This method is applicable to applications requiring power battery discharge control under low-temperature conditions. This method can be executed by the power battery control device provided in this embodiment, which can be implemented in software and / or hardware. For example, it can be an on-board controller. Figure 2 As shown, the method includes:

[0057] S101. Obtain the battery temperature when the vehicle is starting under high voltage conditions.

[0058] After the vehicle undergoes a high-voltage start-up, the high-voltage power from the power battery is connected to the vehicle's electrical system, putting the vehicle in a state of readiness for starting.

[0059] In power battery systems, accurate monitoring of battery temperature is crucial for ensuring battery safety, lifespan, and performance. After high-voltage startup, the battery enters a discharge state, and temperature affects discharge efficiency and safety. Real-time temperature monitoring allows for timely adjustments to discharge power, mitigating the risks of lithium dendrite formation at low temperatures or thermal runaway at high temperatures. Acquiring battery temperature in real-time after high-voltage startup and dynamically adjusting the discharge strategy based on this information is a core technological aspect of achieving safe startup, performance optimization, and lifespan assurance in power battery systems.

[0060] In power battery systems, battery temperature can be acquired using a variety of sensor technologies, and is not limited to a specific type of temperature sensing element. For example, temperature signals can be acquired in the following ways:

[0061] Thermistors (NTC / PTC): Utilizing the non-linear change of resistance of semiconductor materials with temperature, they convert temperature signals into voltage signals through a voltage divider circuit. They have the advantages of low cost, small size, and sensitive response, and are suitable for distributed deployment of high-density battery packs.

[0062] Thermocouples: Based on the Seebeck effect, temperature is measured by the thermoelectric potential difference between two different conductor materials. They have a wide temperature measurement range and fast response characteristics, and can be used for accurate monitoring of temperature in extreme environments or inside battery cells.

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

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

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

[0066] By collecting the temperature values ​​of each battery cell, the system uses algorithms such as arithmetic average and weighted average (e.g., assigning weights based on the degree of cell aging or the importance of the location) to generate feature values ​​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 limiting the discharge power in low-temperature environments (to avoid the risk of lithium dendrite formation caused by lithium-ion conduction obstruction due to local low temperature), 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 especially suitable for operating conditions with large temperature differences or uneven heat dissipation.

[0068] S102. When the battery temperature meets the preset ultra-low temperature conditions, control the battery discharge power to the preset discharge power, which is greater than zero.

[0069] In this embodiment, the battery temperature is monitored in real time. If the battery temperature meets the preset ultra-low temperature condition, it indicates that the battery is currently in an extreme ultra-low temperature environment. At this time, the chemical properties of the battery are unstable. In related technologies, to ensure battery life, the discharge power is generally set to 0KW, for example... Figure 1In some systems, at temperatures below -30°C, the battery's discharge power is forcibly set to 0kW. Since the battery outputs no power at this temperature, components such as the motor required for vehicle startup cannot obtain energy, preventing the vehicle from starting. Furthermore, because there is no external charger to heat the battery, it remains at its current temperature and cannot rise enough to break free from the existing battery discharge pattern's forced discharge power setting of 0kW, remaining in a limited discharge state and causing the vehicle to remain unable to start. In this situation, compared to related technologies, this embodiment no longer uses the forced discharge power corresponding to the original battery discharge pattern. Instead, it controls the battery's discharge power to a preset discharge power, which is greater than zero. Since the battery discharges at the preset discharge power, it can supply power to components such as the motor required for vehicle startup, thus enabling the vehicle to start under preset ultra-low temperature conditions.

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

[0071] It should be noted that this application can also set a preset discharge power value according to actual conditions, such as selecting a preset discharge power corresponding to a preset ultra-low temperature condition based on the battery's physicochemical properties. When selecting this preset discharge power, on the one hand, it is necessary to consider that the preset discharge power should not be too large. Since the battery is under preset ultra-low temperature conditions, a preset discharge power that is too large will cause a sharp increase in the battery's internal resistance, leading to a decline in battery performance, or even permanent damage and a shortened battery life. On the other hand, when setting the preset discharge power, it is also necessary to consider that the preset discharge power meets the energy required for vehicle startup.

[0072] In summary, in this embodiment of the application, if the detected battery temperature meets the preset ultra-low temperature condition during high-voltage starting of the vehicle, a special control strategy is executed. Instead of controlling the discharge according to the battery discharge pattern in related technologies, the discharge power of the battery is controlled to a preset discharge power. This adds a discharge strategy for the battery under the preset ultra-low temperature condition, which enables users to start the vehicle normally under the preset ultra-low temperature condition without relying on external heating equipment or placing it in a garage for insulation. This solves the problem of vehicles failing to start due to low temperatures in the prior art.

[0073] Furthermore, if the battery temperature does not meet the preset ultra-low temperature condition, it indicates that under these conditions, the battery's normal discharge, based on its chemical properties, can meet the vehicle's starting requirements. Therefore, discharge control can be performed according to the battery's discharge profile. The battery discharge profile can be a pre-calibrated table mapping battery temperature to discharge power, quantifying the battery's safe operating window in different temperature ranges. Dynamic management of battery discharge power can be achieved through the battery discharge profile. For example, the battery discharge profile can be a pre-calibrated temperature-discharge power mapping table stored in the battery management system's control chip, used to guide the battery's safe and efficient discharge under different environments. It is typically calibrated by the battery manufacturer through charge-discharge cycle testing. After obtaining the battery temperature, the battery discharge profile can be queried in real time, outputting the corresponding power limit signal to control the motor controller or relays to adjust the discharge power.

[0074] Furthermore, after the vehicle is powered on, it undergoes initialization, and the temperature flag is updated after initialization. Therefore, after acquiring the battery temperature, the validity of the temperature flag can be checked. If the temperature flag is valid, the battery temperature is used to determine whether it meets the preset ultra-low temperature conditions. If the temperature flag is invalid, it means that the battery temperature acquired at this time may be a temperature value obtained during the initialization process. This temperature value is unstable, and using this temperature value to determine whether the preset ultra-low temperature conditions are met may lead to misjudgment.

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

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

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

[0078] The State of Charge (SOC) of a battery is a core parameter for measuring its remaining capacity, representing the percentage of its rated capacity remaining at a given moment. SOC is one of the most critical monitoring indicators in a battery management system, directly impacting safe battery use, lifespan management, and energy optimization strategies. Therefore, a battery's discharge capacity is affected not only by temperature but also by SOC.

[0079] This application incorporates battery temperature and state of charge (SOC) as dual variables into the control model, forming a three-dimensional relationship between discharge power, battery temperature, and SOC. This multi-parameter coupled control strategy more closely reflects the actual operating characteristics of the battery.

[0080] Therefore, in this embodiment, considering the impact of multi-parameter coupling on battery performance, the embodiment also obtains the battery's state of charge (SOC). When the battery temperature meets a preset ultra-low temperature condition and the SOC meets a preset discharge condition, the battery's discharge power is controlled to a preset discharge power. The battery temperature meeting the preset ultra-low temperature condition indicates that the battery is in an extreme low-temperature state. At this point, the embodiment further determines whether the SOC meets the preset discharge condition. If the SOC does not meet the preset discharge condition, it means that the battery's SOC can ensure that it can discharge at the preset discharge power, providing sufficient energy output and preventing over-discharge due to the SOC not meeting the preset discharge condition, which could damage the battery's internal structure.

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

[0082] In this embodiment, a reference state of charge can be preset, and the obtained state of charge of the battery can be compared with the reference state of charge. If the obtained 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 conditions.

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

[0084] If the state of charge (SOC) is less than the reference SOC, it indicates that the battery is in a low SOC state, and the battery may not have enough electrical energy to support discharge at the preset discharge power. Furthermore, at low SOC, more active lithium and electrolyte are consumed, internal resistance increases, and continuous power discharge leads to over-discharge, causing permanent capacity decay. Therefore, in this embodiment, the battery discharge power is controlled to the preset discharge power only when the SOC is greater than or equal to the reference SOC and the battery temperature meets the preset ultra-low temperature conditions. This avoids the problems of excessive consumption of active lithium and electrolyte, increased internal resistance, and over-discharge caused by continuous power discharge at low SOC, which can lead to permanent capacity decay.

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

[0086] Obtain the duration for which the battery discharges at a preset discharge power;

[0087] When the duration of discharge 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 battery's discharge power drops to zero, the battery is controlled to discharge according to the battery discharge pattern.

[0089] In this embodiment, the duration for which the battery discharges at a preset discharge power can be set, for example, a preset discharge duration of 30 seconds. At extremely low temperatures, this embodiment can employ a special strategy to control battery discharge at a preset discharge power greater than zero. However, because the battery temperature is low at this time, prolonged discharge at the preset discharge power will cause permanent damage to the battery, and even subsequent recharging will not restore its previous healthy state. Therefore, this embodiment can pre-calibrate the preset discharge duration for the battery at the preset discharge power. When setting this preset discharge duration, it is necessary to consider both ensuring the vehicle can start and minimizing the impact of low-temperature discharge on battery life. Therefore, while ensuring vehicle starting, the preset discharge duration should be as short as possible to avoid damage to the battery from low-temperature discharge.

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

[0091] After the battery has discharged at a preset discharge power for a preset duration, this application controls the battery's discharge power to decrease to zero according to a preset power gradient. Then, the battery is controlled to discharge according to the battery discharge pattern, thus smoothly switching back to the conventional discharge control strategy. This setting avoids the problem of continuous battery discharge under preset ultra-low temperature conditions, which could affect battery life. Specifically, when the battery discharges at a preset discharge power for a preset duration, sufficient to start the vehicle, the battery's discharge power is controlled to decrease to zero according to a preset power gradient. Then, the system switches to the battery discharge pattern, controlling the battery discharge with the optimized discharge power based on the pattern calibration, maximizing battery performance. Therefore, by controlling the battery's discharge power at a preset discharge power for a preset duration, and then controlling the battery's discharge power to decrease to zero according to a preset power gradient after the preset discharge duration is reached, this application can achieve vehicle starting under extreme low-temperature conditions while also ensuring the lifespan of the power battery.

[0092] Optionally, in this embodiment, controlling the battery's discharge power to decrease to zero according to a preset power gradient, rather than directly reducing the discharge power to zero, can avoid damage to the battery caused by instantaneous large current changes. Directly cutting off the discharge may generate an electric arc, potentially damaging the battery interface and connector contacts. The battery's internal resistance increases at the end of discharge; if power is suddenly cut off, there may be voltage spikes, affecting battery life and even triggering malfunctions in the protection circuit. During the battery's chemical reaction process, a sudden stop to discharge can lead to uneven ion distribution, especially in solid-state or lithium-ion batteries, potentially causing localized stress that affects battery performance over the long term. Controlling the battery's discharge power to decrease to zero according to a preset power gradient allows the chemical reaction to gradually stabilize, reducing 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), for example, controlling the battery discharge power to decrease to zero in a gradient of 5KW / S.

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

[0095] During the duration, a request is made to start the preset power source in the vehicle and to restrict the power consumption of other components besides the preset power source.

[0096] The preset power sources include internal combustion engines and / or fuel cells.

[0097] When an engine or fuel cell starts, it requires a large instantaneous current (such as from the starter motor, fuel cell air compressor, and fuel cell stack preheating). If other non-essential components (such as air conditioning, seat heating, and in-vehicle entertainment systems) are also allowed to draw power, the instantaneous load on the battery (such as the power battery and starter battery) will increase sharply. When the battery output capacity is insufficient, the terminal voltage may drop below the starting threshold, leading to starting failure or prolonged starting time, thus affecting system reliability.

[0098] At this point, the battery temperature meets the preset ultra-low temperature conditions, indicating that the battery's output capacity has significantly decreased (e.g., increased internal resistance and capacity decay of the power battery at low temperatures). If unnecessary loads are not restricted at this time, the risk of start-up failure will increase exponentially. For example, fuel cell systems need 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 the engine may be unable to maintain idle speed after starting due to a depleted battery, causing the vehicle to break down.

[0099] Therefore, in this embodiment of the application, during the period when the battery is controlled to discharge at a preset discharge power, since the battery is in an extreme low temperature discharge condition, in order to ensure that the energy discharged by the battery during this period enables the preset power source to start, this application restricts the power consumption of other components other than the preset power source, so that the energy of the battery in the extreme low temperature discharge is used to start the preset power source in the vehicle, and ensures the normal start of the vehicle under such conditions.

[0100] The embodiments of this application can be applied to gasoline vehicles, fuel cell vehicles (e.g., hydrogen fuel cell vehicles), or hybrid vehicles; therefore, the preset power source can include a gasoline engine and / or a fuel cell. For gasoline vehicles, the preset power source can include a gasoline engine. For fuel cell vehicles, the preset power source can include a fuel cell. For hybrid vehicles, the preset power source can include both a gasoline engine and a fuel cell. After the gasoline engine and / or fuel cell are started, they can be used to provide power to the vehicle and energy to other electrical devices in the vehicle.

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

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

[0103] This application embodiment 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 in the battery discharge spectrum where the discharge power for all corresponding states of charge is 0. In this application embodiment, the temperature in the battery discharge spectrum where the discharge power for all corresponding states of charge is 0 can be found and used as the first reference temperature. In related technologies, if the battery temperature is the first reference temperature, then according to the battery discharge spectrum, the vehicle's battery discharge power will be limited to 0 kW. This application embodiment pre-determines the temperature in the battery discharge spectrum where the discharge power for all corresponding states of charge is 0 based on the battery discharge spectrum corresponding to the battery, and uses it as the first reference temperature. When the vehicle is starting under high voltage conditions, the battery temperature is acquired in real time. If the lowest battery temperature is less than or equal to the first reference temperature, the discharge power is no longer controlled according to the original battery discharge spectrum, but instead the battery is controlled to discharge at a preset discharge power greater than zero, so that the vehicle can start under extreme low temperature conditions.

[0104] The battery comprises multiple battery cells, and the uneven temperature distribution within the battery pack needs to be considered. The temperature of different cells may vary due to factors such as location, contact conditions, and aging. In this embodiment, the lowest temperature of the battery is used to determine whether the battery temperature meets the preset ultra-low temperature condition. Using the most vulnerable battery cell as the benchmark, this approach avoids the problem of over-discharge of the lowest-temperature battery cell caused by setting an average temperature. On the other hand, the average temperature change lags behind the local low-temperature point, which may lead to control delay.

[0105] It should be noted that the embodiments of this application are based on... Figure 1 The example shown is a battery discharge pattern, illustrating the setting of the first reference temperature. In other embodiments, since different batteries have different discharge patterns, the first reference temperature may also be different.

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

[0107] The lowest temperature of the battery is greater than or equal to the second reference temperature, the second reference temperature is less than the first reference temperature, and the 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 this embodiment, a temperature range within which the battery temperature meets a preset ultra-low temperature condition can be set. Specifically, the battery temperature is determined to meet the preset ultra-low temperature condition when its lowest temperature is greater than or equal to a second reference temperature and less than a first reference temperature. Under this condition, the battery's discharge power can be controlled to a preset discharge power to enable vehicle starting. If the battery's lowest temperature is less than the second reference temperature, forcibly discharging the battery due to the extremely low temperature could cause irreversible damage. Therefore, this embodiment sets a suitable temperature range within which the preset ultra-low temperature condition is met, maximizing battery life while enabling normal vehicle starting under the preset ultra-low temperature condition.

[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℃ and / or less than or equal to 10℃, meaning the temperature range that satisfies the preset ultra-low temperature condition can span from 5℃ to 10℃. The advantage of this setting is that it avoids problems such as electrode material structure damage and permanent battery capacity degradation caused by battery discharge when the lower limit of the preset ultra-low temperature condition is too low.

[0110] To more clearly illustrate the technical solutions provided in the embodiments of this application, the following is in conjunction with... Figure 3 This application provides a further explanation of a power battery control method. For example... Figure 3 As shown, the power battery control method provided in this application includes:

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

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

[0113] In this embodiment of the application, if the temperature flag is determined to be valid, the lowest temperature of multiple battery cells in the detected power battery is used as the battery temperature for subsequent determination.

[0114] S203. Determine whether the battery temperature is within the temperature range of greater than or equal to -35℃ and less than -30℃, and simultaneously satisfy the condition that the SOC is greater than or equal to 10%.

[0115] If the battery temperature is within the range of -35°C to -30°C and simultaneously meets the condition that the SOC is greater than or equal to 10%, execute S205; otherwise, execute S204.

[0116] In this embodiment, a battery temperature range of greater than or equal to -35°C and less than -30°C is defined as meeting the preset ultra-low temperature condition. If the battery temperature is within the range of greater than or equal to -35°C and less than -30°C, and the SOC is greater than or equal to 10%, the special power battery discharge strategy in this application is executed; otherwise, the battery is discharged according to the battery discharge pattern.

[0117] S204. Control the battery to discharge according to the battery discharge pattern.

[0118] A battery discharge profile is a pre-calibrated table showing the correspondence between battery temperature and discharge power, quantifying the safe operating window of the battery across different temperature ranges. The battery discharge profile can also consider factors such as the battery's state of charge. Figure 1 If the battery temperature is not within the range of -35℃ to -30℃, then directly look up the current battery temperature and state of charge according to the battery discharge chart, and then control the battery to discharge according to the found discharge power.

[0119] S205. Control the battery discharge power to 10KW, with continuous discharge for 30s. Request the start of the vehicle's internal combustion engine and / or fuel cell, and limit the power consumption of other components besides the internal combustion engine and / or fuel cell.

[0120] In this embodiment, the preset discharge power of the battery under preset ultra-low temperature conditions is determined to be 10KW based on the battery's physicochemical properties. Taking into account both ensuring vehicle starting and minimizing the impact of low-temperature discharge on battery life, the preset discharge duration for 10KW discharge is set to 30 seconds.

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

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

[0123] In this embodiment, after the vehicle is powered by high voltage, the battery temperature is monitored in real time. If the battery temperature is within the range of -35°C to -30°C and simultaneously meets the SOC (State of Charge) requirement of 10% or higher, a special discharge strategy is selected: the battery discharge power is controlled at 10kW for 30 seconds. During the 10kW discharge period, the vehicle's internal combustion engine and / or fuel cell are requested to start. Upon successful start-up, the internal combustion 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 besides the internal combustion engine and / or fuel cell is restricted, such as restricting the power consumption of other high-voltage components in the vehicle, to ensure that the internal combustion engine and / or fuel cell have sufficient power to start. Compared to related technologies, this embodiment no longer uses the forced discharge power corresponding to the original battery discharge pattern, but instead controls the battery discharge power to a preset discharge power greater than zero under preset ultra-low temperature conditions. Since the battery discharges at a preset discharge power greater than zero, it can supply power to components such as the motor required for vehicle starting. Therefore, the vehicle can have power output, enabling starting under preset ultra-low temperature conditions without relying on external heating equipment or insulation in a garage. This solves the problem of vehicles failing to start due to low temperatures in existing technologies. During the discharge period, to ensure that the energy discharged by the battery during this period is sufficient to start the combustion engine and / or fuel cell, this application restricts the power consumption of components other than the combustion engine and / or fuel cell. This allows the energy discharged by the battery at extreme low temperatures to be used to start the combustion engine and / or fuel cell in the vehicle, so that after starting, the combustion engine and / or fuel cell can directly drive the vehicle and also provide power to other electrical components.

[0124] In addition, this application also provides a power battery control device. For example... Figure 4 As shown, Figure 4 This is a schematic diagram of a power battery control device provided in an embodiment of this application. The device includes:

[0125] Temperature acquisition module 301 is used to acquire the battery temperature when the vehicle is starting under high voltage conditions;

[0126] The power control module 302 is used to control the battery discharge power to a preset discharge power when the battery temperature meets the preset ultra-low temperature conditions. The preset discharge power is greater than zero.

[0127] The power battery control device provided in this application, when the detected battery temperature meets the preset ultra-low temperature condition during high-voltage starting of the vehicle, executes a special control strategy. Instead of controlling discharge according to the battery discharge profile in related technologies, it controls the battery discharge power to a preset discharge power, adding a discharge strategy for the battery under the preset ultra-low temperature condition. This allows users to start the vehicle normally under the preset ultra-low temperature condition without relying on external heating equipment or insulation in a garage, solving the problem of vehicle starting failure due to low temperatures in existing technologies. If the battery temperature does not meet the preset ultra-low temperature condition, it means that the battery, based on its chemical properties, can discharge normally under this condition to meet the vehicle starting requirements. Therefore, discharge control can be performed according to the battery discharge profile. The battery discharge profile can be a pre-calibrated table of battery temperature-discharge power correspondence, quantifying the safe operating window of the battery in different temperature ranges. Dynamic management of battery discharge power can be achieved through the battery discharge profile. The battery discharge profile, for example, can be a pre-calibrated temperature-discharge power mapping table stored in the control chip of the battery management system, used to guide the safe and efficient discharge of the battery in different environments. It is usually calibrated by the battery manufacturer through charge-discharge cycle testing. After obtaining the battery temperature, the battery discharge spectrum can be queried in real time, and the corresponding power limit signal can be output. The discharge power can be adjusted by controlling the motor controller or relay.

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

[0129] In some optional implementations, the power control module is further configured to acquire the duration for which the battery discharges at a preset discharge power; when the duration reaches the preset discharge duration, control the battery discharge power to decrease to zero according to a preset power gradient; when the battery discharge power decreases to zero, control the battery to discharge according to the battery discharge pattern.

[0130] In some alternative implementations, the power control module is also configured to request the start of a preset power source in the vehicle for a duration of time and limit the power consumption of other components besides the preset power source; the preset power source includes a fuel engine and / or a fuel cell.

[0131] In some alternative implementations, the process by which the power control module determines that the battery temperature meets a preset ultra-low temperature condition may include:

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

[0133] In some alternative implementations, the process by which the power control module determines that the battery temperature meets a preset ultra-low temperature condition may further include:

[0134] The battery temperature is greater than or equal to the second reference temperature, the second reference temperature is less than the first reference temperature, and the 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 alternative implementations, the process by which the power control module determines that the state of charge meets preset discharge conditions includes: the state of charge being greater than or equal to a reference state of charge.

[0136] Regarding the apparatus in the above embodiments, the specific manner in which each unit performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0137] Figure 5 This is a schematic diagram of the structure of an on-board controller provided in an embodiment of this 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 used to execute the computer program to implement the power battery control method mentioned in any of the above embodiments.

[0138] This embodiment can divide the vehicle controller into functional modules according to the above method example. For example, each module can correspond to a separate function module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0139] It is understood that the memory 401 in this embodiment may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. In some embodiments, the memory 401 stores elements such as executable units or data structures, or subsets thereof, or extended sets thereof, operating systems, and applications. In embodiments of this disclosure, the processor 402 executes the steps of the various embodiments of the methods provided in this disclosure by invoking programs or instructions stored in the memory 401.

[0140] The method provided in this disclosure can be applied to or implemented by processor 402. Processor 402 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the hardware of processor 402 or by instructions in software form. The 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 devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor.

[0141] The steps of the method provided in this disclosure can be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software units in the decoding processor. The software units can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other storage media mature in the art. This storage medium is located in memory 401, and processor 402 reads information from memory 401 and combines it with its hardware to complete the steps of the method.

[0142] It should be noted that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

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

[0144] When using integrated units, the power battery control method may include a processing module and a storage module. The processing module is used to control and manage the actions of the on-board controller. The storage module is used to support the on-board controller in executing program code and data.

[0145] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and microprocessors, etc., and the storage module may be a memory.

[0146] This embodiment also provides a vehicle, including the vehicle controller from any of the above embodiments.

[0147] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement a power battery control method provided in the above embodiment.

[0148] Computer-readable storage media may take the form of any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0149] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above-mentioned related steps to realize the power battery control method provided in the above embodiment.

[0150] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone 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] The beneficial effects of the above embodiments can be referred to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0152] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to 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 apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be coupled or communicated, which can be electrical, mechanical, or other forms. They can be combined or integrated into another device, or some features may be ignored or not performed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0154] In the description of this disclosure, it should be understood that if the terms "upper", "lower", "front", "rear", "left" and "right" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

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

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

Claims

1. A method of controlling a power battery, characterized in that, The control method comprises: obtaining a battery temperature under a high-voltage starting condition of a whole vehicle; controlling a discharge power of the battery to be a preset discharge power when the battery temperature meets a preset ultra-low temperature condition, the preset discharge power being greater than zero; wherein the battery temperature meeting the preset ultra-low temperature condition comprises: a minimum temperature of the battery being less than a first reference temperature, the first reference temperature being a temperature at which discharge powers corresponding to all states of charge in a battery discharge map are all 0; and the minimum temperature of the battery being greater than or equal to a second reference temperature, the second reference temperature being less than the first reference temperature, and the second reference temperature being a temperature at which damage to the battery is caused when the battery is forced to discharge.

2. The power battery control method according to claim 1, wherein The control method further comprises: obtaining a state of charge of the battery; controlling the discharge power of the battery to be the preset discharge power when the battery temperature meets the preset ultra-low temperature condition and the state of charge meets a preset discharge condition.

3. The power battery control method according to claim 1 or 2, characterized in that, The control method further comprises: obtaining a duration of discharging the battery at the preset discharge power; controlling the discharge power of the battery to decrease to zero according to a preset power gradient when the duration reaches a preset discharge duration; controlling the battery to discharge according to a battery discharge map when the discharge power of the battery decreases to zero.

4. The power battery control method according to claim 3, characterized in that, The control method further comprises: requesting a preset power source in the whole vehicle to start within the duration, and limiting the use of power by components other than the preset power source; the preset power source comprising a fuel engine and / or a fuel cell.

5. The power battery control method according to claim 1, wherein The battery temperature meeting the preset ultra-low temperature condition further comprises: a temperature difference between the second reference temperature and the first reference temperature being greater than or equal to 5℃, and / or less than or equal to 10℃.

6. The power battery control method according to claim 2, wherein The state of charge meeting the preset discharge condition comprises: the state of charge being greater than or equal to a reference state of charge.

7. A power cell control device, characterized by comprising: The control method comprises: a temperature obtaining module, configured to obtain a battery temperature under a high-voltage starting condition of a whole vehicle; a power control module, configured to control a discharge power of the battery to be a preset discharge power when the battery temperature meets a preset ultra-low temperature condition, the preset discharge power being greater than zero, wherein the battery temperature meeting the preset ultra-low temperature condition comprises: a minimum temperature of the battery being less than a first reference temperature, the first reference temperature being a temperature at which discharge powers corresponding to all states of charge in a battery discharge map are all 0; and the minimum temperature of the battery being greater than or equal to a second reference temperature, the second reference temperature being less than the first reference temperature, and the second reference temperature being a temperature at which damage to the battery is caused when the battery is forced to discharge.

8. An in-vehicle controller characterized by comprising: A computer program product comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the power battery control method according to any one of claims 1 to 6 when executing the computer program.

9. A vehicle characterized by comprising: The vehicle-mounted controller according to claim 8.

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