Battery energy management method, device, electronic equipment and vehicle

Abstract

The present application provides a battery energy management method. After determining that the starting mode is a low-temperature cold start mode, the vehicle's requested power is obtained and the actual output power of the fuel cell is determined. The current energy management demand can be determined by comparing the actual output power and the requested power. Then, the recovery power or compensation power corresponding to the energy management demand is determined based on the requested power and the actual output power. By recovering the recovery power in the actual output power, it is ensured that the power battery will not be in danger of overcharging. The actual output power is compensated with the compensation power, which solves the problem of insufficient power output of the vehicle, thereby ensuring that the fuel cell can be started smoothly, and avoiding the problem of continuous decline in power of the power battery or even direct power failure of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery energy management method, device, electronic device, and vehicle. Background Art

[0002] Environmental protection is becoming a topic of concern in various industries, and the automotive industry is no exception. Domestic and foreign automotive industries and their parts developers are paying more and more attention to whether there will be a fuel that can protect the environment and save resources for use in automobiles. Therefore, hydrogen fuel cells, as a clean, efficient and pollution-free electrochemical power generation device, have received widespread attention at home and abroad. At the same time, hydrogen fuel cell vehicles have become the mainstream of the current development of the automotive industry. Therefore, the safety and economy of fuel cell vehicles have become topics that all automobile companies must pay attention to. However, when the vehicle's power battery temperature is lower than -20°C, the output power of the fuel cell is greater than the charging power of the power battery, which will cause overcharging of the power battery. At this time, the start-up of the fuel cell will be prohibited, resulting in a continuous decline in the power of the power battery or even direct power loss of the vehicle. In addition, the charging and discharging power of the power battery is small at low temperatures, resulting in a small actual power output of the fuel cell, which may lead to insufficient power output of the vehicle. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a battery energy management method, device, electronic equipment and vehicle to solve the problems of vehicle power failure, power battery overcharging and insufficient power output in low temperature environments.

[0004] Based on the above objectives, a first aspect of the present application provides a battery energy management method, characterized by comprising:

[0005] Determine the fuel cell startup mode;

[0006] If the start mode is a low-temperature cold start mode, obtaining a requested power of the vehicle and determining an actual output power of the fuel cell;

[0007] The recovery power or the compensation power is determined according to the requested power and the actual output power.

[0008] Optionally, obtaining the requested power of the vehicle and determining the actual output power of the fuel cell includes:

[0009] Obtaining the requested power, the charging power of the power battery, and the rated power of the electric heater;

[0010] determining a maximum output power of the fuel cell according to the rated power and the charging power;

[0011] The actual output power of the fuel cell is determined according to the requested power, the rated power and the maximum output power.

[0012] Optionally, determining the actual output power of the fuel cell according to the requested power, the rated power, and the maximum output power includes:

[0013] If the requested power is less than or equal to the rated power, determining the rated power as the actual output power;

[0014] If the requested power is greater than the rated power, the maximum output power is determined as the actual output power.

[0015] Optionally, determining the recovery power or the compensation power according to the requested power and the actual output power includes:

[0016] Determine the rated output power of the vehicle;

[0017] determining a plurality of power intervals according to the rated power, the maximum output power, and the rated output power of the entire vehicle;

[0018] Determining a target power range within which the requested power falls;

[0019] The recovery power or the compensation power is determined according to the target power range and the actual output power.

[0020] Optionally, determining the rated output power of the vehicle includes:

[0021] Obtaining the discharge power of the power battery;

[0022] The entire vehicle rated output power of the vehicle is determined according to the maximum output power and the discharge power.

[0023] Optionally, the multiple power intervals include a first power interval, a second power interval, a third power interval, and a fourth power interval; and determining the multiple power intervals according to the rated power, the maximum output power, and the rated output power of the vehicle includes:

[0024] determining an interval less than or equal to the rated power as the first power interval;

[0025] Determine an interval that is greater than the rated power and less than or equal to the maximum output power as the second power interval;

[0026] Determining a range greater than the maximum output power and less than or equal to the rated output power of the vehicle as the third power range;

[0027] A range greater than the rated output power of the entire vehicle is determined as the fourth power range.

[0028] Optionally, determining the recovery power or compensation power according to the target power range and the actual output power includes:

[0029] If the target power interval is the first power interval, determining the rated power as the actual output power, and determining the difference between the rated power and the requested power as the recovered power;

[0030] If the target power interval is the second power interval, determining the maximum output power as the actual output power, and determining the difference between the maximum output power and the requested power as the recovered power;

[0031] If the target power interval is the third power interval, determining the maximum output power as the actual output power, and determining the difference between the requested power and the maximum output power as the compensation power;

[0032] If the target power interval is the fourth power interval, the maximum output power is determined as the actual output power, and a power reduction prompt is given.

[0033] A second aspect of the present application provides a battery energy management device, comprising:

[0034] The startup mode confirmation module is configured to: determine the startup mode of the fuel cell;

[0035] an actual output determination module configured to: if the start mode is a low-temperature cold start mode, obtain a requested power of the vehicle and determine an actual output power of the fuel cell;

[0036] The power management module is configured to determine the recovery power or the compensation power according to the requested power and the actual output power.

[0037] The third aspect of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method provided in the first aspect of the present application is implemented.

[0038] The fourth aspect of the present application provides a vehicle, comprising the electronic device provided in the third aspect of the present application.

[0039] From the above, it can be seen that the battery energy management method, device, electronic device and vehicle provided by the present application first need to determine the starting mode of the fuel cell. Only in the cold start mode can the battery energy management method provided by the present application solve the problems of vehicle failure to power on, power battery overcharging and insufficient power output in low temperature environment; after determining that the starting mode is the low-temperature cold start mode, the vehicle's requested power is obtained and the actual output power of the fuel cell is determined. The current energy management requirements can be determined by comparing the actual output power and the requested power, and then the recovery power or compensation power corresponding to the energy management requirements is determined according to the requested power and the actual output power. The recovery power in the actual output power is recovered to ensure that the power battery will not be in danger of overcharging, and the actual output power is compensated by the compensation power, which solves the problem of insufficient power output of the vehicle, thereby ensuring that the fuel cell can be started smoothly, avoiding the problem of continuous decline in power battery or even direct power loss of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 This is a flow chart of the battery energy management method according to an embodiment of the present application;

[0042] Figure 2 Flowchart for determining requested power and actual output power according to an embodiment of the present application;

[0043] Figure 3 Flowchart for determining actual output power according to an embodiment of the present application;

[0044] Figure 4 A flowchart for determining recovery power or compensation power according to an embodiment of the present application;

[0045] Figure 5 A flowchart for dividing power intervals according to an embodiment of the present application;

[0046] Figure 6 This is a schematic diagram of a flow chart for determining recovery power or compensation power according to a target power range according to an embodiment of the present application;

[0047] Figure 7 This is a schematic diagram of the structure of the energy management device of the battery according to the embodiment of the present application;

[0048] Figure 8 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0050] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] As shown in the background technology, in the relevant technology, if the power battery temperature is low, the charging power of the power battery will also be very low or even reduced to 0kW. Therefore, when the power battery temperature of a fuel cell vehicle is lower than -15°C, the battery charging power is low. When the temperature is lower than -20°C, the vehicle can only be started and driven by pure electricity, and the fuel cell is prohibited from starting. However, when the power battery power is low, the vehicle may not be able to drive normally; if the fuel cell can be started, if an emergency load reduction condition occurs during driving, the fuel cell power cannot be instantly reduced due to its own characteristics, and when the fuel cell coolant temperature is lower than 5°C, the fuel cell start is a cold start. During the cold start of the fuel cell, the fuel cell current must reach at least 75A. At this time, the fuel cell generates 23KW of power, otherwise there will be a risk of reverse polarity inside the fuel cell, affecting the life of the fuel cell. However, the fuel cell's own accessories can consume up to 13kW of power, so the actual output power of the fuel cell is 10kW±1kW, but at this time the charging power of the power battery is small, and emergency load reduction will cause the power battery to be overcharged.

[0052] Therefore, when the power battery temperature is lower than -15℃ and the power battery charge is lower than the fuel cell start-up threshold, the fuel cell needs to be started to meet the vehicle's dynamic energy balance and prevent the power battery from feeding power. However, when the vehicle's power battery temperature is lower than -15℃, the vehicle's power demand is small and the power battery has no recharging capability (the power battery's charging power is low, even 0KW). In the emergency load reduction state, the vehicle only allows the fuel cell's actual output power to be less than or equal to the power battery's rechargeable power. However, the power battery's charging and discharging power are affected by temperature and current charge. Therefore, at low temperatures, the power battery's rechargeable power is very small or even 0kW, and the fuel cell's output power will overcharge the power battery. , which may reduce the life of the power battery. Therefore, for safety reasons, the vehicle will be prohibited from starting the fuel cell at this time (because at low temperatures, it is necessary to ensure that the output power of the fuel cell must be less than or equal to the rechargeable power of the power battery. Otherwise, during emergency braking of the vehicle, due to the unique characteristics of the fuel cell, the output power cannot be reduced instantaneously, which may overcharge the power battery and reduce the service life of the power battery). The vehicle must be driven purely by electricity, but when the power battery is low, the vehicle can only be powered off, which makes it impossible to complete the cold start of the vehicle at low temperature, causing complaints from customers. The smaller charging power limits the actual output power of the fuel cell, which may cause the vehicle to have insufficient power output.

[0053] The battery energy management method provided in the embodiment of the present application can determine the current energy management demand by comparing the actual output power and the requested power after determining that the starting mode is the low-temperature cold start mode, and then determine the recovery power or compensation power corresponding to the energy management demand based on the requested power and the actual output power. The recovery power in the actual output power is recovered by the electric heater to ensure that the power battery will not be in danger of overcharging in an emergency load reduction situation. The power battery compensates the actual output power with the compensation power, solving the problem of insufficient power output of the vehicle. While recovering the power, the electric heater increases the temperature of the power battery and the fuel cell coolant, ensuring that the fuel cell can be started smoothly, avoiding the problem of continuous decline in the power of the power battery or even direct power loss of the vehicle. The specific explanation is combined with the following embodiments.

[0054] In some embodiments, after the user performs the power-on operation, it is necessary to detect the current power of the power battery. When the current power is less than or equal to the preset power-off power, it is determined that the power battery power is too low, the power-on process is stopped, and the driver is notified that the power battery power is too low; when the current power is greater than the preset power-off power, the current power is compared with the start-up threshold of the fuel cell. If the current power is greater than the start-up threshold, it means that the power battery power is sufficient and pure electric power is performed; if the current power is less than or equal to the start-up threshold, it means that the power battery power is insufficient and the fuel cell needs to be started. If the temperature of the coolant is greater than the preset temperature threshold at this time, it is determined that the cold start condition of the fuel cell is not met and the fuel cell is controlled to start at normal temperature. If the temperature of the coolant is less than or equal to the preset temperature threshold at this time, it is determined that the coolant power is insufficient and the fuel cell power is insufficient. When the temperature meets the cold start condition of the fuel cell, the battery is controlled to perform a low-temperature cold start. After the fuel cell is cold started at low temperature, the charging power of the power battery, the actual output power of the fuel cell, the rated power of the electric heater and the requested power of the vehicle are obtained. When the requested power is greater than zero and less than or equal to the rated power, the heating power is calculated, and the entire vehicle is heated according to the heating power consumption; when the requested power is greater than the rated power and less than or equal to the maximum output power, the recovery power is calculated, and the power battery is charged according to the recovery power; when the requested power is greater than the maximum output power and less than or equal to the rated output power of the vehicle, the compensation power is calculated, and the power battery is controlled to discharge according to the compensation power; when the requested power is greater than the rated output power of the vehicle, the user is prompted to reduce the requested power.

[0055] In some embodiments, as Figure 1 As shown, a battery energy management method includes:

[0056] Step 100: Determine the startup mode of the fuel cell.

[0057] In this step, since the low-temperature starting method of the battery provided in the embodiment of the present application is a method for starting the fuel cell in a low-temperature environment and when the power battery power is low (for example, the power battery temperature is lower than -20°C and the fuel cell temperature is lower than 5°C), it is first necessary to determine the current power of the power battery. Optionally, when the driver performs the vehicle power-on process, for example, inserting the car key into the keyhole and turning the car key to the "ON" flag, the central control switch module (CCU) deployed in the vehicle starts to control the vehicle to execute the power-on process. At this time, the central control switch module first needs to detect the state of charge (SOC) of the power battery to determine the current power. If the current power of the power battery is less than or equal to 5%, it is considered that the power battery power is low, and the central control switch module CCU cannot control the vehicle to continue to execute the power-on process, and the instrument (Instrument) The central control switch module CCU prompts the driver that "the power battery is low and the vehicle cannot be powered on"; if the current power of the power battery is greater than 5%, the central control switch module CCU controls the vehicle to perform pure electric power-on. After the vehicle is powered on purely by electric power, it continues to detect the current power of the power battery. When the current power of the power battery reaches the fuel cell start-up threshold, the central control switch module CCU requests the fuel cell to start and sends a start request to the fuel control unit (Fuel Control Unit, FCU); after the fuel control unit FCU receives the start-up request sent by the central control switch module CCU, it controls the fuel cell system to start and detects the coolant temperature of the fuel cell. If the coolant temperature is greater than 5°C, the fuel cell performs normal temperature start-up and determines that the start-up type is normal temperature start-up mode. If the coolant temperature is less than or equal to 5°C, the fuel cell performs low temperature cold start and determines that the start-up type is cold start-up mode. Then, the fuel control unit FCU sends the fuel cell start-up type to the central control switch module CCU and controls the fuel cell to start according to the start-up type.

[0058] Step 200: If the start mode is a low-temperature cold start mode, obtain the requested power of the vehicle and determine the actual output power of the fuel cell.

[0059] In this step, the requested power of the vehicle refers to the power requested by the power battery and / or fuel cell when the vehicle performs the driver's operation; in order to meet the requested power of the vehicle, the actual output power of the fuel cell will change with the change of the requested power of the vehicle, but in order to avoid overcharging of the power battery during emergency load reduction, it is necessary to limit the maximum output power of the fuel cell. The maximum output power of the fuel cell refers to the maximum power allowed to be released by the fuel cell during the cold start process in order to avoid damage to the power battery due to overcharging. For example, the maximum output power can be composed of two parts, namely the rated power of the electric heater and the charging power of the power battery, wherein the rated power of the electric heater refers to the effective power that the electric heater can continuously output, that is, the maximum power that can continue to work under normal working conditions, that is, the maximum power that the electric heater can consume.

[0060] Step 300: Determine the recovery power or compensation power according to the requested power and the actual output power.

[0061] In this step, the total output of the power battery and fuel cell is taken as the rated output power of the vehicle, and the maximum output power of the fuel cell is P F =P BC +P PTC The maximum output power of the power battery is the discharge power P at the current temperature and current power level. BD , where P BC is the charging power of the power battery at the current temperature and current power level, P PTC The rated power of the electric heater is P, and the sum of the rated power and the charging power is used as the maximum output power to ensure that the power battery and the electric heater can consume all the actual output power after the vehicle enters the emergency load reduction state, avoiding excessive power causing overcharging of the power battery or overloading of the electric heater, reducing safety hazards. The rated output power of the vehicle is P V =P BD +P F =P BC +P BD +P PTC When the requested power is less than or equal to the rated output power of the vehicle, the electric heater can be used to recover the actual output power that is greater than the requested power to ensure that the power battery will not be overcharged in an emergency load reduction situation. The power battery compensates for the actual output power with a compensation power that is greater than the actual output power, solving the problem of insufficient vehicle power output. However, when the requested power is greater than the rated output power of the vehicle, for safety reasons, the fuel cell output cannot be further increased, and the driver can only be prompted that the current power is insufficient, so that the driver can reduce the requested power.

[0062] To summarize, after determining that the starting mode is the low-temperature cold start mode, the current energy management demand can be determined by comparing the actual output power and the requested power. Then, when the requested power is less than or equal to the rated output power of the vehicle, the electric heater is used to recover the recovered power in the actual output power to ensure that the power battery will not be in danger of overcharging in an emergency load reduction situation; or the power battery can be controlled to compensate for the actual output power with compensation power, thereby solving the problem of insufficient power output of the vehicle. While recovering the power, the electric heater increases the temperature of the power battery and fuel cell coolant, ensuring that the fuel cell can be started smoothly, avoiding the problem of continuous decline in power of the power battery or even direct power loss of the vehicle.

[0063] In some embodiments, as Figure 2 As shown, obtaining the requested power of the vehicle and determining the actual output power of the fuel cell include:

[0064] Step 210: Obtain the requested power, the charging power of the power battery, and the rated power of the electric heater.

[0065] In this step, when the driver operates the vehicle, the vehicle determines the required requested power according to the driver's request; since the charging power of the power battery is positively correlated with the current temperature of the power battery and the rate of change is large, a small temperature change will produce a large change in the charging power, and the charging power of the power battery is negatively correlated with the power of the power battery and the rate of change is small, a large change in power will produce a large change in the charging power; for example, when the current temperature is -18°C and the power is 6%, if the charging power of the power battery is 19KW at this time (when it is below -20°C, the charging power may drop rapidly to 0KW), when the temperature rises to -10°C, the power is 6%. Under the premise of unchanged temperature, the charging power can reach 45KW; under the premise of unchanged current temperature, when the power level increases from 6% to 10%, the charging power of the power battery will only change from 19KW to 18KW. Therefore, when it is determined that the fuel cell is cold started, it can be said that the current temperature of the power battery is already lower than -15°C and the power level is already lower than the starting threshold of the fuel cell. At this time, the change in power level will hardly cause a change in power, so the charging power of the power battery is mainly determined by the current temperature; optionally, the rated power of the electric heater has been stored in the vehicle's storage medium when the electric heater is installed. When the data is needed, the rated power in the storage medium can be called.

[0066] Step 220: Determine the maximum output power of the fuel cell according to the rated power and the charging power.

[0067] In this step, for example, the rated power P is calculated. PTC and charging power P BC and PF =P BC +P PTC , P F Determining the maximum output power of the fuel cell and taking the rated power and charging power as the maximum output power can ensure that the power battery and electric heater can consume all the actual output power after the vehicle enters the emergency load reduction state, avoiding excessive power causing overcharging of the power battery or overloading of the electric heater, and reducing safety hazards.

[0068] Step 230: Determine the actual output power of the fuel cell according to the requested power, the rated power and the maximum output power.

[0069] In this step, if the requested power is less than or equal to the rated power, PV'≤P PTC =10kW, the actual output power of the fuel cell at this time is P F =10kW; if the requested power is greater than the rated power, PV'≥P PTC =10kW, at this time the actual output power of the fuel cell is the maximum output power P F =P BC +P PTC =P BC +10kW.

[0070] In some embodiments, as Figure 3 As shown, the actual output power of the fuel cell is determined according to the requested power, rated power and maximum output power, including:

[0071] Step 231: If the requested power is less than or equal to the rated power, the rated power is determined as the actual output power.

[0072] In this step, if the required power is less than or equal to the rated power, the rated power is determined as the actual output power of the fuel cell. Because when the required power is less than or equal to the rated power, controlling the actual output power of the fuel cell to be equal to the required power can meet the driver's driving needs, but the power battery is not operating at this time and the temperature rises very slowly. Therefore, the difference between the rated power and the required power is used, which is 10-P V Running the electric heater accelerates the temperature rise of the power battery and reduces the time it takes to start the fuel cell. When the vehicle enters the emergency load reduction state, the electric heater can consume all of the actual output power, ensuring that there is no risk of overcharging the power battery.

[0073] Step 232: If the requested power is greater than the rated power, the maximum output power is determined as the actual output power.

[0074] In this step, if the required power is greater than the rated power, the maximum output power is determined as the actual output power of the fuel cell. Because when the required power is greater than the rated power, controlling the actual output power of the fuel cell to be equal to the required power can meet the driver's driving needs, but the power battery is not operating at this time and the temperature rises very slowly. Therefore, the difference between the maximum output power and the required power, P, is used. F -P V Running the electric heater accelerates the temperature rise of the power battery and reduces the time it takes to complete the startup of the fuel cell. Furthermore, after the vehicle enters the emergency load reduction state, since the charging power of the power battery and the rated power of the electric heater are equal to the maximum output power, the power battery and the electric heater can consume all of their actual output power at this time, so there is no risk of overcharging the power battery.

[0075] In some embodiments, as Figure 4 As shown, the recovery power or compensation power is determined according to the requested power and the actual output power, including:

[0076] Step 310: Determine the rated output power of the vehicle.

[0077] This step includes: obtaining the discharge power of the power battery.

[0078] The vehicle's rated output power is determined based on the maximum output power and discharge power.

[0079] Among them, since the discharge power of the power battery is positively correlated with the current temperature of the power battery, temperature changes will lead to an increase in discharge power, and the discharge power of the power battery is also positively correlated with the power of the power battery, and the change in power will increase the discharge power; for example, when the current temperature is -20℃ and the power is 6%, if the discharge power of the power battery is 10KW at this time, when the temperature rises to -10℃, under the premise of unchanged power, the discharge power can reach 13KW; and under the condition that the current temperature remains unchanged, when the power increases from 6% to 10%, the discharge power of the power battery changes from 10KW to 12KW, so the discharge power of the power battery can be determined by the current temperature and current power of the power battery, then the rated output power P of the whole vehicle V =P BD +P F =P BC +P BD +P PTC , vehicle rated output power P V Indicates the maximum output power that the power battery and fuel cell can currently provide to the vehicle.

[0080] Step 320: Determine multiple power intervals based on the rated power, the maximum output power, and the rated output power of the vehicle.

[0081] In this step, illustratively, the multiple power intervals include a first power interval, a second power interval, a third power interval, and a fourth power interval; Figure 5 As shown, step 320 includes:

[0082] Step 321: Determine an interval that is less than or equal to the rated power as a first power interval.

[0083] In this step, 0 kW to 10 kW is used as the first power interval because the electric heater can consume the upper limit of the first power interval.

[0084] Step 322: Determine an interval that is greater than the rated power and less than or equal to the maximum output power as a second power interval.

[0085] In this step, transfer 10KW to P F The second power range is because the electric heater needs to be used for power recovery.

[0086] Step 323: Determine the interval that is greater than the maximum output power and less than or equal to the rated output power of the vehicle as the third power interval.

[0087] In this step, P F To P V The third power range is because the power battery needs to be used for power compensation at this time.

[0088] Step 324: Determine the interval greater than the rated output power of the vehicle as the fourth power interval.

[0089] In this step, it will be greater than P V The fourth power interval is because a power limit reminder is required at this time.

[0090] Step 330: Determine the target power range in which the requested power falls.

[0091] Step 340: Determine the recovery power or compensation power according to the target power range and the actual output power.

[0092] In specific implementation, Figure 6 As shown, step 340 includes:

[0093] Step 341: If the target power interval is the first power interval, the rated power is determined as the actual output power, and the difference between the rated power and the requested power is determined as the recovered power.

[0094] In this step, for example, if the requested power is P V'=8KW, 0KW≤8KW≤10KW, the requested power is in the first power interval, so the first power interval is used as the target power interval. At this time, the fuel control unit FCU controls the fuel cell to operate with the rated power of 10KW as the actual output power. The actual output power of the fuel cell drives the vehicle according to the requested power while 10-P V '=10-8=2KW as the recovered power, and the electric heater is used to consume the recovered power to accelerate the increase in the temperature of the power battery and fuel cell coolant.

[0095] Step 342: If the target power interval is the second power interval, the maximum output power is determined as the actual output power, and the difference between the maximum output power and the requested power is determined as the recovered power.

[0096] In this step, for example, if the requested power is P V '=12KW, charging power P BC =18KW, then P F =P BC +P PTC =10+18=28KW, 10KW≤12KW≤28KW, the requested power is in the second power range, so the second power range is used as the target power range. At this time, the fuel control unit FCU controls the fuel cell to operate with the maximum output power of 28KW as the actual output power. The actual output power of the fuel cell drives the vehicle according to the requested power while 28-P V '=28-12=16KW is used as the recovery power. The electric heater is first used to consume the recovery power at a rated power of 10KW, and then the remaining 6KW is used to charge the power battery to accelerate the increase in the temperature of the power battery and the fuel cell coolant.

[0097] Step 343: If the target power interval is the third power interval, the maximum output power is determined as the actual output power, and the difference between the requested power and the maximum output power is determined as the compensation power.

[0098] In this step, for example, if the requested power is P V '=30KW, charging power P BC =18KW, discharge power P BD =12KW, then the maximum output power P F =P BC +P PTC =10+18=28KW, the rated output power of the vehicle P V =P BD +P F =P BC +P BD +P PTC=18+12+10=40KW, 28KW≤30KW≤40KW, the requested power is in the third power range, so the third power range is used as the target power range. At this time, the fuel control unit FCU controls the fuel cell to operate with the maximum output power of 28KW as the actual output power. The actual output power of the fuel cell cannot meet the vehicle driving demand. When the power battery power level is higher than the power-off threshold power level (for example, 5%), the power battery is used to compensate the actual output power of the fuel cell. The compensation power is 30-P F =30-28=2KW. Power compensation can meet the driver's current driving needs, solve the problem of insufficient power output during low-temperature starting of fuel cell vehicles, and improve the driver's driving experience.

[0099] Step 344: If the target power interval is the fourth power interval, the maximum output power is determined as the actual output power, and a power reduction prompt is issued.

[0100] In this step, for example, if the requested power is P V '=45KW, charging power P BC =18KW, discharge power P BD =12KW, then the maximum output power P F =P BC +P PTC =10+18=28KW, the rated output power of the vehicle P V =P BD +P F =P BC +P BD +P PTC =18+12+10=40KW, 40KW≤45KW. The requested power is in the fourth power interval, so the fourth power interval is used as the target power interval. At this time, the fuel control unit FCU controls the fuel cell to operate with the maximum output power of 28KW as the actual output power. The actual output power of the fuel cell still cannot meet the current vehicle driving requirements after compensation by the power battery. For safety reasons, the fuel cell output power cannot be further increased. The driver can only be notified that the current power is insufficient, so that the driver can reduce the requested power and protect the power battery from overcharging.

[0101] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario and performed by multiple devices working together. In such a distributed scenario, one of the multiple devices may only perform one or more steps of the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the method.

[0102] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0103] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a battery energy management device.

[0104] refer to Figure 7 , a battery energy management device, comprising:

[0105] The startup mode confirmation module 10 is configured to: determine the startup mode of the fuel cell;

[0106] The actual output determination module 20 is configured to: if the start mode is a low-temperature cold start mode, obtain the requested power of the vehicle and determine the actual output power of the fuel cell;

[0107] The power management module 30 is configured to determine the recovery power or the compensation power according to the requested power and the actual output power.

[0108] For the convenience of description, the above devices are described as being divided into various modules according to their functions. Of course, when implementing this application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0109] The apparatus of the above embodiment is used to implement the corresponding battery energy management method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0110] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein when the processor executes the program, the battery energy management method described in any of the above embodiments is implemented.

[0111] Figure 8 10 is a schematic diagram showing a more specific hardware structure of an electronic device provided in this embodiment. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other within the device via the bus 1050.

[0112] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0113] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage devices, dynamic storage devices, etc. The memory 1020 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0114] The input / output interface 1030 is used to connect input / output modules to implement information input and output. The input / output modules can be configured as components within the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. Input devices may include a keyboard, mouse, touch screen, microphone, various sensors, etc., and output devices may include a display, speaker, vibrator, indicator light, etc.

[0115] The communication interface 1040 is used to connect to a communication module (not shown) to enable communication between the device and other devices. The communication module can communicate via a wired method (such as USB, network cable, etc.) or a wireless method (such as mobile network, WiFi, Bluetooth, etc.).

[0116] The bus 1050 comprises a path for transmitting information between the various components of the device (eg, the processor 1010 , the memory 1020 , the input / output interface 1030 , and the communication interface 1040 ).

[0117] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, it will be understood by those skilled in the art that the above device may only include the components necessary to implement the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0118] The electronic device of the above embodiment is used to implement the corresponding battery energy management method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0119] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the battery energy management method described in any of the above embodiments.

[0120] The computer-readable media of this embodiment include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0121] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the battery energy management method described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0122] It should be noted that the embodiments of the present application can be further described in the following manner:

[0123] In some embodiments, the central control switch module obtains the current power of the power battery. If the current power of the power battery is less than or equal to 5%, a display message of "the power battery is low and the vehicle cannot be powered on" is sent to the instrument; if the current power of the power battery is greater than 5%, the central control switch module controls the vehicle to perform pure electric power-on. After the vehicle is powered on purely electrically, the central control switch module continues to detect the current power of the power battery. When the current power of the power battery reaches the fuel cell start-up threshold, a start request is sent to the fuel control unit. If the current power of the power battery does not reach the fuel cell start-up threshold, the current power of the power battery continues to be detected until the current power reaches the start-up threshold; then Then, the charging power of the power battery, the actual output power of the fuel cell, the rated power of the electric heater and the requested power of the vehicle are obtained. When the requested power is greater than zero and less than or equal to the rated power, the power consumption of the electric heater is calculated and sent to the vehicle integrated unit; when the requested power is greater than the rated power and less than or equal to the maximum output power, the recovery power is calculated and sent to the battery management system; when the requested power is greater than the maximum output power and less than or equal to the rated output power of the vehicle, the compensation power is calculated and sent to the battery management system; when the requested power is greater than the rated output power of the vehicle, a message to reduce the requested power is sent to the instrument.

[0124] In some embodiments, after the fuel control unit receives the start-up request sent by the central control switch module, it controls the fuel cell system to start and obtain the charging power of the power battery and the rated power of the electric heater, and determines the maximum output power based on the charging power and the rated power, and after determining the actual output power, sends the actual output power to the central control switch module.

[0125] In some embodiments, after receiving the consumed power, the vehicle integrated unit controls the electric heater to perform heating according to the consumed power.

[0126] In some embodiments, when the battery management system receives compensation power, it controls the power battery to discharge according to the compensation power; and when it receives recovery power, it controls the power battery to charge according to the recovery power.

[0127] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0128] In addition, for simplicity of description and discussion, and in order not to make the embodiment of the application difficult to understand, the known power supply / ground connection with integrated circuit (IC) chip and other components may or may not be shown in the accompanying drawings provided. In addition, the device can be shown in the form of a block diagram to avoid making the embodiment of the application difficult to understand, and this also takes into account the following fact, that is, the details of the embodiment of these block diagram devices are highly dependent on the platform to be implemented in the embodiment of the application (that is, these details should be fully within the scope of understanding of those skilled in the art). When specific details (for example, circuit) are set forth to describe exemplary embodiments of the application, it will be apparent to those skilled in the art that the embodiment of the application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0129] Although the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may utilize the embodiments discussed.

[0130] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A battery energy management method, characterized in that: include: Determine the fuel cell startup mode; If the start mode is a low-temperature cold start mode, obtaining a requested power of the vehicle and determining an actual output power of the fuel cell; The obtaining of the requested power of the vehicle and determining the actual output power of the fuel cell includes: Obtaining the requested power, the charging power of the power battery, and the rated power of the electric heater; determining a maximum output power of the fuel cell according to the rated power and the charging power; determining an actual output power of the fuel cell according to the requested power, the rated power, and the maximum output power; The step of determining the actual output power of the fuel cell according to the requested power, the rated power, and the maximum output power includes: If the requested power is less than or equal to the rated power, determining the rated power as the actual output power; If the requested power is greater than the rated power, determining the maximum output power as the actual output power; determining recovery power or compensation power according to the requested power and the actual output power; The determining of the recovery power or the compensation power according to the requested power and the actual output power includes: Determine the rated output power of the vehicle; determining a plurality of power intervals according to the rated power, the maximum output power, and the rated output power of the entire vehicle; Determining a target power range within which the requested power falls; The recovery power or the compensation power is determined according to the target power range and the actual output power.

2. The method according to claim 1, characterized in that Determining the rated output power of the vehicle includes: Obtaining the discharge power of the power battery; The entire vehicle rated output power of the vehicle is determined according to the maximum output power and the discharge power.

3. The method according to claim 1, characterized in that The multiple power intervals include a first power interval, a second power interval, a third power interval, and a fourth power interval; and determining the multiple power intervals according to the rated power, the maximum output power, and the rated output power of the vehicle includes: determining an interval less than or equal to the rated power as the first power interval; Determine an interval that is greater than the rated power and less than or equal to the maximum output power as the second power interval; Determining a range greater than the maximum output power and less than or equal to the rated output power of the vehicle as the third power range; A range greater than the rated output power of the entire vehicle is determined as the fourth power range.

4. The method according to claim 3, characterized in that The determining of the recovery power or the compensation power according to the target power range and the actual output power includes: If the target power interval is the first power interval, determining the rated power as the actual output power, and determining the difference between the rated power and the requested power as the recovered power; If the target power interval is the second power interval, determining the maximum output power as the actual output power, and determining the difference between the maximum output power and the requested power as the recovered power; If the target power interval is the third power interval, determining the maximum output power as the actual output power, and determining the difference between the requested power and the maximum output power as the compensation power; If the target power interval is the fourth power interval, the maximum output power is determined as the actual output power, and a power reduction prompt is given.

5. A battery energy management device, characterized in that: include: The startup mode confirmation module is configured to: determine the startup mode of the fuel cell; an actual output determination module configured to: if the start mode is a low-temperature cold start mode, obtain a requested power of the vehicle and determine an actual output power of the fuel cell; The obtaining of the requested power of the vehicle and determining the actual output power of the fuel cell includes: Obtaining the requested power, the charging power of the power battery, and the rated power of the electric heater; determining a maximum output power of the fuel cell according to the rated power and the charging power; determining an actual output power of the fuel cell according to the requested power, the rated power, and the maximum output power; The step of determining the actual output power of the fuel cell according to the requested power, the rated power, and the maximum output power includes: If the requested power is less than or equal to the rated power, determining the rated power as the actual output power; If the requested power is greater than the rated power, determining the maximum output power as the actual output power; A power management module is configured to: determine recovery power or compensation power according to the requested power and the actual output power; The determining of the recovery power or the compensation power according to the requested power and the actual output power includes: Determine the rated output power of the vehicle; determining a plurality of power intervals according to the rated power, the maximum output power, and the rated output power of the entire vehicle; Determining a target power range within which the requested power falls; The recovery power or the compensation power is determined according to the target power range and the actual output power.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to any one of claims 1 to 4 is implemented.

7. A vehicle, characterized in that: Comprising the electronic device as claimed in claim 6.

Images