Dynamic low-temperature starting method and device for battery, electronic equipment and vehicle

Abstract

The present application provides a dynamic low-temperature starting method for a battery. After starting the fuel cell, the actual output power of the fuel cell is determined according to the requested power and the maximum output power of the whole vehicle. After the vehicle enters the emergency load reduction state, since the charging power of the power battery is very small or even 0 kW at low temperatures, the power battery and the electric heater are controlled to consume the actual output power at this time, and the electric heater is increased to consume the actual output power, thereby reducing or even avoiding the fuel cell from outputting power to the power battery. The process of determining the actual output power ensures that the power battery and the electric heater can consume all the actual output power until the coolant temperature reaches the preset temperature threshold, and the fuel cell is started. This solves the problem of overcharging of the power battery during emergency load reduction caused by the low temperature of the power battery during the low-temperature cold start process of the vehicle fuel cell.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a dynamic low-temperature starting method and device for a battery, an electronic device, and a vehicle. Background Art

[0002] With the increasing scarcity of global resources and the increasing severity of environmental pollution, environmental protection has become a topic of concern to all industries, and the automotive industry is no exception. Domestic and foreign automotive industries and their parts developers are increasingly concerned about 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 a topic that all automobile companies must pay attention to. However, when the vehicle's power battery temperature is lower than -20℃, the vehicle's requested power is small (generally less than 10KW) and the power battery has no recharge capability. Therefore, when the vehicle is urgently unloaded, the output power of the fuel cell will be greater than the charging power of the power battery, causing overcharging of the power battery. At this time, the start of the fuel cell will be prohibited, resulting in the vehicle being able to only be powered off when the power battery is low. Summary of the invention

[0003] In view of this, the purpose of this application is to propose a dynamic low-temperature starting method, device, electronic equipment and vehicle for a battery to solve the problem of overcharging of the power battery when the vehicle's fuel cell is in an emergency load reduction due to the low temperature of the power battery during the low-temperature cold start process.

[0004] Based on the above purpose, the first aspect of the present application provides a dynamic low-temperature starting method for a battery, comprising:

[0005] If the current power level of the power battery satisfies the cold start condition of the fuel cell, starting the fuel cell;

[0006] Determining the maximum output power of the fuel cell and the vehicle requested power;

[0007] Determining the actual output power of the fuel cell according to the vehicle requested power and the maximum output power;

[0008] If the vehicle enters an emergency load reduction state, the power battery is controlled to stop discharging, and the power battery and the electric heater are controlled to consume the actual output power, and the coolant temperature of the fuel cell is detected in real time;

[0009] If the coolant temperature reaches a preset temperature threshold, the fuel cell is started up.

[0010] Optionally, determining the maximum output power of the fuel cell includes:

[0011] Determining a current temperature of the power battery, and determining a charging power of the power battery according to the current temperature;

[0012] Determining the rated power of the electric heater;

[0013] The maximum output power of the fuel cell is determined according to the rated power and the charging power.

[0014] Optionally, determining the actual output power of the fuel cell according to the vehicle requested power and the maximum output power includes:

[0015] If the vehicle requested power is less than or equal to the rated power, determining the rated power as the actual output power of the fuel cell;

[0016] If the vehicle requested power is greater than the rated power, the maximum output power is determined as the actual output power of the fuel cell.

[0017] Optionally, the power consumption includes charging power consumption and heating power consumption, and the controlling the power battery and the electric heater to consume the actual output power includes:

[0018] If the rated power is the actual output power of the fuel cell, determining the required power of the electric heater;

[0019] The difference power between the actual output power and the vehicle requested power is calculated, and the heating power consumption and the charging power consumption are determined according to the difference power and the required power.

[0020] Optionally, the power consumption includes charging power consumption and heating power consumption, and the controlling the power battery and the electric heater to consume the actual output power includes:

[0021] If the maximum output power is the actual output power of the fuel cell, the charging power is determined as the charging power consumption, and the rated power is determined as the heating power consumption.

[0022] Optionally, determining the heating power consumption according to the difference power and the required power includes:

[0023] If the required power is greater than or equal to the difference power, determining the required power as the heating power consumption;

[0024] If the required power is less than the difference power, the difference power is determined as the heating power consumption.

[0025] Optionally, the vehicle enters an emergency load reduction state, including:

[0026] Real-time detection of the opening of the brake pedal of the vehicle;

[0027] If the opening is less than or equal to a preset opening threshold, it is determined that the vehicle will enter the emergency load reduction state.

[0028] A second aspect of the present application provides a dynamic low-temperature starting device for a battery, comprising:

[0029] The battery starting module is configured to: start the fuel cell if the current power of the power battery meets the cold start condition of the fuel cell;

[0030] A power confirmation module is configured to: determine the maximum output power of the fuel cell and the vehicle's requested power;

[0031] An output confirmation module is configured to: determine the actual output power of the fuel cell according to the vehicle requested power and the maximum output power;

[0032] The power consumption module is configured to: if the vehicle enters an emergency load reduction state, control the power battery to stop discharging, control the power battery and the electric heater to consume the actual output power, and detect the coolant temperature of the fuel cell in real time;

[0033] The state detection module is configured to: if the temperature of the coolant reaches a preset temperature threshold, the fuel cell is started up.

[0034] The third aspect of the present application provides an electronic device, including 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.

[0035] The fourth aspect of the present application provides a vehicle, comprising the electronic device provided in the third aspect of the present application.

[0036] From the above, it can be seen that the dynamic low-temperature starting method, device, electronic device and vehicle of the battery provided by the present application need to determine the maximum output power of the fuel cell and the vehicle's whole vehicle requested power after starting the fuel cell, and determine the actual output power of the fuel cell based on the vehicle's requested power and the maximum output power. After the vehicle enters the emergency load reduction state, the power battery is controlled to stop discharging. However, since the charging power of the power battery is affected by temperature and power, the charging power of the power battery is very small or even 0kW at low temperatures. Therefore, at this time, the power battery and the electric heater are controlled to consume the actual output power, and the electric heater is increased to consume the actual output power, thereby reducing or even avoiding the fuel cell from outputting power to the power battery. The process of determining the actual output power ensures that the power battery and the electric heater can consume all the actual output power until the coolant temperature reaches the preset temperature threshold, and the fuel cell is started, thereby solving the problem of overcharging of the power battery during emergency load reduction caused by the low temperature of the power battery during the low-temperature cold start of the vehicle fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a flow chart of a dynamic low-temperature starting method for a battery according to an embodiment of the present application;

[0039] Figure 2 A flow chart for determining the maximum output power of a fuel cell according to an embodiment of the present application;

[0040] Figure 3 A flow chart for determining the actual output power of a fuel cell according to an embodiment of the present application;

[0041] Figure 4 A flow chart of power consumption for an embodiment of the present application;

[0042] Figure 5 This is a schematic structural diagram of a dynamic low-temperature starting device for a battery according to an embodiment of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0045] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of 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 can 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.

[0046] As shown in the background technology, in the relevant technology, when the power battery temperature of a vehicle using a fuel cell is lower than -15°C, the charging power of the power battery is low, and when the power battery temperature is lower than -20°C, the charging power of the power battery is almost 0KW; and when the coolant temperature of the fuel cell is lower than 5°C, the fuel cell start-up is a cold start. During the cold start process, the current of the fuel cell must reach at least 75A. At this time, the power generated by the fuel cell is 23KW, otherwise there will be a risk of reverse polarity inside the fuel cell, which will affect the life of the fuel cell. However, the fuel cell's own accessories can consume up to 13kW of power, so the net output power of the fuel cell is 10kW±1kW.

[0047] Therefore, when the power battery temperature is lower than -15℃ and the power battery charge is lower than the fuel cell start threshold, the fuel cell needs to be started to meet the vehicle dynamic energy balance and prevent the power battery from feeding. However, when the vehicle power battery temperature is lower than -15℃, the vehicle's requested power is small and the power battery has no recharge capability (the charging power of the power battery is low, even 0KW). In the emergency load reduction state, the vehicle only allows the actual output power of the fuel cell to be less than or equal to the rechargeable power of the power battery. However, the charging and discharging power of the power battery is affected by the temperature and the current power. Therefore, at low temperatures, the rechargeable power of the power battery is very small or even 0kW. The output power of the fuel cell 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 (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, due to the unique characteristics of the fuel cell during emergency braking, 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 charge is low, the vehicle can only be powered off, which leads to the inability to complete the low-temperature cold start of the vehicle, causing complaints from customers.

[0048] In the related art, the fuel cell output power is requested according to the rechargeable power of the power battery. When the charging power of the power battery is less than 5kW, the central computing unit (CCU) prompts the driver through the instrument panel (IP) that "the power battery temperature is low, please heat it up". The fuel cell cannot be started before the heating is completed, which makes the customer's driving experience worse.

[0049] The dynamic low-temperature starting method of the battery provided in the embodiment of the present application performs pure electric power-on of the vehicle and starts the fuel cell when the power of the power battery is lower than the starting threshold of the fuel cell. When the vehicle starts, the power battery gives priority to driving the vehicle and providing the power required for starting the fuel cell. When the fuel cell cold start is completed, the vehicle is completely driven by the fuel cell, and the power battery is not charged at this time. However, it is necessary to ensure that the output power of the fuel cell is less than or equal to the sum of the rechargeable power of the power battery and the rated power of the electric heater. In this way, when the vehicle is urgently unloaded, the actual output power of the fuel cell can be used to charge the power battery and consume the electric heater of the entire vehicle, which solves the problem of overcharging of the power battery when the vehicle is urgently unloaded due to the low temperature of the power battery during the low-temperature cold start process of the vehicle fuel cell. The fuel cell can be started smoothly until the coolant temperature reaches the preset temperature threshold and the fuel cell is started. The specific explanation needs to be made in conjunction with the following embodiments.

[0050] 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 is too low, the power-on process is stopped, and the driver is notified that the power battery 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 has sufficient power and pure electric power-on is performed. If the current power is less than or equal to the start-up threshold, it means that the power battery is insufficient and the fuel cell needs to be started. If the temperature of the coolant meets the cold start condition of the fuel cell at this time, the battery is controlled to be cold started at low temperature. After starting the fuel cell, the vehicle's requested power is determined and the maximum output power of the fuel cell is determined based on the charging power of the power battery and the rated power of the electric heater. Then, the actual output power of the fuel cell is determined based on the maximum output power and the vehicle's requested power. In the event of an emergency load reduction, the actual output power of the fuel cell is consumed. Before the rated power of the electric heater is reached, the electric heater is preferentially controlled to consume the actual output power. In the case of surplus power, the power battery is controlled to consume the remaining actual output power to avoid overcharging of the power battery. This is done until the coolant temperature is monitored to reach the preset temperature threshold, confirming that the fuel cell startup is complete.

[0051] In some embodiments, Figure 1 As shown, a dynamic low-temperature starting method for a battery comprises:

[0052] Step 100: If the current power level of the power battery meets the cold start condition of the fuel cell, start the fuel cell.

[0053] In this step, dynamic refers to the emergency load reduction state that occurs during the low-temperature cold start process of the fuel cell. Since the low-temperature start method of the battery provided in the embodiment of the present application is a method for starting a fuel cell in a low-temperature environment and when the power battery is low in power (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 begins 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 is low in power, 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 electricity, 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 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 a normal temperature start and determines that the start type is a normal temperature start mode. If the coolant temperature is less than or equal to 5°C, the fuel cell performs a low temperature cold start and determines that the start type is a cold start mode. Then, the fuel control unit (FCU) sends the fuel cell start type to the central control switch module (CCU) and controls the fuel cell to start according to the start type.

[0054] Step 200: Determine the maximum output power of the fuel cell and the vehicle power request of the vehicle.

[0055] In this step, 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. Exemplarily, 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 at most; the vehicle's whole vehicle request power refers to the power requested from the power battery and / or fuel cell when the vehicle executes the driver's operation; when the fuel cell is cold started, the vehicle is driven by the fuel cell and the power battery is not charged at this time, but the fuel cell output power needs to be less than or equal to the sum of the power battery charging power and the rated power of the electric heater.

[0056] Step 300: Determine the actual output power of the fuel cell according to the vehicle's requested power and the maximum output power.

[0057] In this step, it is first necessary to determine the relationship between the vehicle's requested power and the rated power of the electric heater. If the vehicle's requested power is less than or equal to the rated power, the rated power is determined as the actual output power of the fuel cell; if the vehicle's requested power is greater than the rated power, the maximum output power is determined as the actual output power of the fuel cell.

[0058] Step 400: If the vehicle enters an emergency load reduction state, the power battery is controlled to stop discharging, and the power battery and the electric heater are controlled to consume the actual output power, and the coolant temperature of the fuel cell is detected in real time.

[0059] In this step, when the driver performs an emergency load reduction operation on the vehicle (for example, pressing the brake pedal to the bottom for emergency braking), the vehicle enters an emergency load reduction state. At this time, the power battery is controlled to stop discharging, and the discharge power of the power battery is rapidly reduced to 0kW. However, the output power of the fuel cell cannot be reduced instantaneously. Therefore, an electric heater is required to consume part of the current actual output power of the fuel cell to avoid the actual power of the fuel cell being greater than the charging power of the power battery, causing overcharging of the power battery, and to detect the coolant temperature of the fuel cell in real time to determine the startup completion status of the fuel cell.

[0060] Step 500: If the coolant temperature reaches a preset temperature threshold, the fuel cell is started.

[0061] In this step, the start-up completion state of the fuel cell is determined by real-time detection of the fuel cell coolant temperature. When the coolant temperature reaches the preset temperature threshold of 40°C, the fuel cell start-up can be determined to be complete. When the power battery temperature exceeds -15°C, the fuel cell can be controlled to exit the cold start mode, because at this time the charging power of the power battery rises rapidly due to the increase in temperature, which has far exceeded the determined power of the electric heater, and may be greater than the vehicle request power at this time. At this time, when the vehicle enters the emergency downshift state again, when the requested power is small, from the perspective of energy recovery, it can be selected to preferentially use the power battery to partially or fully recover the actual output power of the fuel cell. If the actual output power is greater than the charging power, the electric heater is used to consume the remaining power without the risk of overcharging; from the perspective of absolute safety, it can be selected to preferentially use the electric heater to partially or fully consume the actual output power of the fuel cell. If the actual output power is greater than the rated power, the power battery is used to recover the remaining power.

[0062] To summarize, the dynamic low-temperature starting method of the battery provided in the embodiment of the present application needs to ensure that the actual output power of the fuel cell is less than or equal to the sum of the rechargeable power of the power battery and the rated power of the electric heater when the power of the power battery is lower than the starting threshold of the fuel cell and after the fuel cell is cold started. In this way, when the vehicle is urgently unloaded, the actual output power of the fuel cell can be used to charge the power battery and consume the electric heater, which solves the problem of overcharging of the power battery when the vehicle is urgently unloaded due to the low temperature of the power battery during the low-temperature cold start process. The fuel cell can be started smoothly until the coolant temperature reaches the preset temperature threshold and the fuel cell is started.

[0063] In some embodiments, Figure 2 As shown, the maximum output power of the fuel cell is determined, including:

[0064] Step 210: Determine the current temperature of the power battery, and determine the charging power of the power battery according to the current temperature.

[0065] In this step, since the charging power of the power electricity 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 electricity 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; illustratively, when the current temperature is -18°C and the power is 6%, if the charging power of the power battery is 19KW (when it is below -20°C, the charging power may drop rapidly to 0KW), when the temperature rises to -10°C, under the premise of unchanged power, the charging power can reach 45KW; and when the current temperature remains unchanged, when the power increases from 6% to 10%, the charging power of the power battery will only change from 19KW to 18KW, so when it is determined that the fuel cell is cold started, it can be explained that the current temperature of the power battery is already lower than -15°C, and the power is already lower than the start threshold of the fuel cell. At this time, the change in power will hardly cause a change in power, so the charging power of the power battery is mainly determined by the current temperature.

[0066] Step 220: Determine the rated power of the electric heater.

[0067] In this step, since the electric heaters of different vehicles have different models, types and rated powers, the rated powers of the electric heaters need to be stored in advance, and the stored data can be called to confirm the rated power of the motor heater when needed.

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

[0069] In this step, for example, the rated power P is calculated. PTC and charging power P BC and, P F =P BC +P PTC , P F Determining the maximum output power of the fuel cell and taking the rated power and the charging power as the maximum output power can 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, and reducing safety hazards.

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

[0071] Step 310: If the requested power of the entire vehicle is less than or equal to the rated power, the rated power is determined as the actual output power of the fuel cell.

[0072] In this step, if the vehicle request 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 vehicle request power is less than or equal to the rated power, controlling the actual output power of the fuel cell to be equal to the vehicle request 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 rated power P is used. PTC and vehicle power request P V The electric heater can be operated with the difference power to speed up the temperature rise of the power battery and reduce the time it takes to start the fuel cell. After the vehicle enters the emergency load reduction state, the electric heater can consume all the actual output power to ensure that there is no risk of over-charging the power battery.

[0073] Step 320: If the vehicle's requested power is greater than the rated power, the maximum output power is determined as the actual output power of the fuel cell.

[0074] In this step, if the vehicle's requested 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 vehicle's requested power is greater than the rated power, controlling the actual output power of the fuel cell to be equal to the vehicle's requested 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 maximum output power P is used. F and vehicle power request P V The electric heater is operated with the difference power, which speeds up the temperature rise of the power battery and reduces the time it takes to start the fuel cell; and 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 the actual output power at this time, so there is no danger of over-charging the power battery.

[0075] In some embodiments, Figure 4 As shown, the power consumption includes charging power consumption and heating power consumption, and the power consumption of the power battery and the electric heater is controlled to be calculated based on the actual output power, including:

[0076] Step 410: If the rated power is the actual output power of the fuel cell, determine the required power of the electric heater.

[0077] In this step, after determining that the actual output power of the fuel cell is the rated power of the electric heater, it is necessary to determine the required power of the electric heater at this time. The required power is the power required by the driver to adjust the air conditioner and other heating equipment in the vehicle. Some other default heating powers may also be added, such as the power consumption of a separate heater specifically used to heat the coolant. Only by determining the required power can the actual output power of the fuel cell be better allocated during emergency load reduction.

[0078] Step 420: Calculate the difference power between the actual output power and the vehicle requested power, and determine the heating power consumption and the charging power consumption according to the difference power and the required power.

[0079] The heating power consumption and the charging power consumption are determined according to the difference power and the required power, including:

[0080] If the required power is greater than or equal to the difference power, the required power is determined as the heating power consumption;

[0081] If the required power is less than the difference power, the difference power is determined as the heating power consumption.

[0082] In the specific implementation, it is first necessary to calculate the difference power between the actual output power and the requested power of the whole vehicle. If the required power is greater than or equal to the difference power, the required power is determined as the heating power consumption. Among them, since the difference power cannot meet the required power of the electric heater, in order to meet the heating needs of the driver, the power battery is used to compensate for the difference power so that the electric heater can operate at the required power to ensure the driver's heating needs, increase the temperature of the vehicle, power battery and coolant as soon as possible, and improve the driver's driving experience; if the required power is less than the difference power, the difference power is determined as the heating power consumption. Due to the low temperature, in order to avoid the risk of over-charging of the power battery, when the electric heater can consume all the difference power, the electric heater is operated at the difference power to protect the power battery.

[0083] In some embodiments, the power consumption includes charging power consumption and heating power consumption, and controlling the power battery and the electric heater to consume the actual output power includes:

[0084] If the maximum output power is the actual output power of the fuel cell, the charging power is determined as the charging power consumption, and the rated power is determined as the heating power consumption.

[0085] In specific implementation, since the vehicle has entered the emergency load shedding state, and the actual output power of the fuel cell is the maximum output power at this time, and the maximum output power is greater than the rated power of the electric heater, if the electric heater is operated at the actual output power, it will cause the electric heater to be overloaded, causing damage to the electric heater, and even causing safety hazards such as fire. The electric heater cannot consume all the actual output power at this time. At this time, limiting the maximum output power of the fuel cell can ensure that after the electric heater consumes the actual output power at the rated power, the excess actual output power is equal to the charging power at this time. Using the power battery to consume this part of the power will not cause the problem of overcharging the power battery, thereby ensuring that the emergency load shedding operation will not cause damage to the power battery and the electric heater.

[0086] In some embodiments, the vehicle enters an emergency load reduction state, including:

[0087] Real-time detection of the vehicle's brake pedal opening;

[0088] If the opening is less than or equal to a preset opening threshold, it is determined that the vehicle will enter an emergency load reduction state.

[0089] Among them, for example, emergency load shedding can be simply understood as the driver performing emergency braking, so it is necessary to detect the opening of the vehicle's brake pedal in real time. When performing emergency load shedding, the driver will step on the brake pedal hard, and the opening of the brake pedal will decrease rapidly. When the opening is less than or equal to the preset opening threshold, it is determined that the vehicle will enter the emergency load shedding state.

[0090] 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 to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the described method.

[0091] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0092] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides a dynamic low-temperature starting device for a battery.

[0093] refer to Figure 5 , the dynamic low-temperature starting device of the battery comprises:

[0094] The battery starting module 10 is configured to: start the fuel cell if the current power of the power battery meets the cold start condition of the fuel cell;

[0095] The power confirmation module 20 is configured to: determine the maximum output power of the fuel cell and the vehicle's requested power;

[0096] The output confirmation module 30 is configured to: determine the actual output power of the fuel cell according to the vehicle requested power and the maximum output power;

[0097] The power consumption module 40 is configured to: if the vehicle enters an emergency load reduction state, control the power battery to stop discharging, control the power battery and the electric heater to consume the actual output power, and detect the coolant temperature of the fuel cell in real time;

[0098] The state detection module 50 is configured to: if the temperature of the coolant reaches a preset temperature threshold, the fuel cell is started up.

[0099] For the convenience of description, the above device is described in terms of functions divided into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0100] The device of the above embodiment is used to implement the dynamic low-temperature starting method of the battery corresponding to any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0101] 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 executable on the processor, wherein when the processor executes the program, the dynamic low-temperature startup method of the battery described in any of the above embodiments is implemented.

[0102] Figure 6 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and 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 connected to each other through the bus 1050 in the device.

[0103] The processor 1010 can be implemented by 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.

[0104] The memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 may store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0105] The input / output interface 1030 is used to connect the input / output module to realize information input and output. The input / output module can be configured in the device as a component (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. The input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0106] The communication interface 1040 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired mode (such as USB, network cable, etc.) or a wireless mode (such as mobile network, WIFI, Bluetooth, etc.).

[0107] The bus 1050 includes a path that transmits 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).

[0108] 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 the specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.

[0109] The electronic device of the above embodiment is used to implement the dynamic low-temperature starting method of the battery corresponding to 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, 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 dynamic low-temperature starting method of the battery as described in any of the above embodiments.

[0111] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, 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 disk read-only memory (CD-ROM), digital versatile disk (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.

[0112] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the dynamic low-temperature starting method of the battery as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0113] It should be noted that the embodiments of the present application can be further described in the following manner:

[0114] 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, 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, the charging power of the power battery is obtained and sent to the fuel control unit; the requested power of the whole vehicle and the actual output power of the fuel cell are obtained, and it is determined whether the vehicle has an emergency load reduction. If not, the requested power of the whole vehicle and the actual output power of the fuel cell continue to be obtained; if so, an emergency load reduction signal is sent and the requested heating power of the electric heater is obtained, and the heating power of the electric heater and the charging power of the power battery are controlled according to the requested heating power.

[0115] In some embodiments, after the fuel control unit receives a start 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 determines the actual output power and sends the actual output power to the central control switch module.

[0116] In some embodiments, after receiving the emergency load reduction signal, the vehicle integrated unit determines the requested heating power and sends the requested heating power to the central control switch module.

[0117] 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. In line with the concept 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.

[0118] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present 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.

[0119] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0120] 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 the present application.

Claims

1. A dynamic low-temperature starting method for a battery, characterized in that: include: If the current power level of the power battery satisfies the cold start condition of the fuel cell, starting the fuel cell; Determining the maximum output power of the fuel cell and the vehicle requested power; Determining the actual output power of the fuel cell according to the vehicle requested power and the maximum output power; If the vehicle enters an emergency load reduction state, the power battery is controlled to stop discharging, and the power battery and the electric heater are controlled to consume the actual output power, and the coolant temperature of the fuel cell is detected in real time; If the coolant temperature reaches a preset temperature threshold, the fuel cell is started; Wherein, determining the maximum output power of the fuel cell includes: Determining a current temperature of the power battery, and determining a charging power of the power battery according to the current temperature; Determining 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; Wherein, determining the actual output power of the fuel cell according to the vehicle requested power and the maximum output power includes: If the vehicle requested power is less than or equal to the rated power, determining the rated power as the actual output power of the fuel cell; If the vehicle requested power is greater than the rated power, the maximum output power is determined as the actual output power of the fuel cell.

2. The method according to claim 1, characterized in that: The power consumption includes charging power consumption and heating power consumption, and the controlling the power battery and the electric heater to consume the actual output power includes: If the rated power is the actual output power of the fuel cell, determining the required power of the electric heater; The difference power between the actual output power and the vehicle requested power is calculated, and the heating power consumption and the charging power consumption are determined according to the difference power and the required power.

3. The method according to claim 1, characterized in that The power consumption includes charging power consumption and heating power consumption, and the controlling the power battery and the electric heater to consume the actual output power includes: If the maximum output power is the actual output power of the fuel cell, the charging power is determined as the charging power consumption, and the rated power is determined as the heating power consumption.

4. The method according to claim 2, characterized in that: The determining the heating power consumption according to the difference power and the required power includes: If the required power is greater than or equal to the difference power, determining the required power as the heating power consumption; If the required power is less than the difference power, the difference power is determined as the heating power consumption.

5. The method according to claim 1, characterized in that The vehicle enters an emergency load reduction state, including: Real-time detection of the opening of the brake pedal of the vehicle; If the opening is less than or equal to a preset opening threshold, it is determined that the vehicle will enter the emergency load reduction state.

6. A dynamic low-temperature starting device for a battery, characterized in that: include: The battery starting module is configured to: start the fuel cell if the current power of the power battery meets the cold start condition of the fuel cell; A power confirmation module is configured to: determine the maximum output power of the fuel cell and the vehicle's requested power; Wherein, determining the maximum output power of the fuel cell includes: Determining a current temperature of the power battery, and determining a charging power of the power battery according to the current temperature; Determine 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; An output confirmation module is configured to: determine the actual output power of the fuel cell according to the vehicle requested power and the maximum output power; Wherein, determining the actual output power of the fuel cell according to the vehicle requested power and the maximum output power includes: If the vehicle requested power is less than or equal to the rated power, determining the rated power as the actual output power of the fuel cell; If the vehicle requested power is greater than the rated power, determining the maximum output power as the actual output power of the fuel cell; The power consumption module is configured to: if the vehicle enters an emergency load reduction state, control the power battery to stop discharging, control the power battery and the electric heater to consume the actual output power, and detect the coolant temperature of the fuel cell in real time; The state detection module is configured to: if the temperature of the coolant reaches a preset temperature threshold, the fuel cell is started up.

7. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 5 when executing the program.

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

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