Battery low-temperature starting method, device, electronic device, storage medium and vehicle

Abstract

The present application provides a low-temperature starting method for a battery, which determines the starting type of the fuel cell according to the current power and the coolant temperature. If the starting type is the cold start mode, the fuel cell is started and the output power of the fuel cell is determined. The actual power of the electric heater is determined according to the output power and the required power of the electric heater. The electric heater is controlled to heat the coolant according to the actual power, and the coolant temperature is monitored in real time. When the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed and power supply to the electric heater is stopped. By utilizing the electric heater to consume the output power of the fuel cell, the problem of overcharging of the power battery under low temperature conditions is avoided. The coolant and the power battery are heated, the charging power of the power battery is increased, and the power battery is charged, which solves the problem that the vehicle cannot be powered on when the fuel cell reaches the cold start condition and the charging power of the power battery is less than the output power of the fuel cell.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a low-temperature starting method, device, electronic device, storage medium, and vehicle for a battery. 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 increasingly concerned about whether there will be a fuel that can both 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 vehicle's power demand is small (generally less than 10KW) and the power battery has no recharging capability. At this time, the fuel cell cannot be started, so the vehicle cannot be cold started at low temperatures, causing complaints from customers. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a low-temperature starting method, device, electronic device, storage medium and vehicle for a battery to solve the problem that the power battery temperature is too low to consume the fuel cell output power during the low-temperature cold start of the fuel cell, resulting in a continuous drop in the power battery temperature or even direct power-off of the vehicle.

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

[0005] detecting a current charge level of the power battery and a coolant temperature of the fuel cell, and determining a startup type of the fuel cell according to the current charge level and the coolant temperature;

[0006] If the startup type is a cold start mode, starting the fuel cell and determining the output power of the fuel cell;

[0007] determining the actual power of the electric heater according to the output power and the required power of the electric heater;

[0008] controlling the electric heater to heat the coolant according to the actual power, and monitoring the coolant temperature in real time;

[0009] When the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

[0010] Optionally, determining the startup type of the fuel cell according to the current power and the coolant temperature includes:

[0011] determining a vehicle power-on status based on the current power level;

[0012] If the vehicle is powered on successfully, determining whether to start the fuel cell according to the current power level;

[0013] If the fuel cell needs to be started, the start-up type is determined according to the coolant temperature.

[0014] Optionally, determining the vehicle power-on status according to the current power level includes:

[0015] Comparing the current power level with the power-down power level;

[0016] If the current battery level is less than or equal to the power-down level, a low battery reminder is given and the vehicle fails to power on.

[0017] If the current power level is greater than the power-down power level, pure electric power-up is performed and the vehicle is successfully powered on.

[0018] Optionally, if the vehicle is powered on successfully, determining whether the fuel cell needs to be started according to the current power level includes:

[0019] comparing the current power level with a start-up threshold of the fuel cell;

[0020] If the current power level is greater than the start threshold, determining that the fuel cell does not need to be started;

[0021] If the current power level is less than or equal to the start-up threshold, it is determined that the fuel cell needs to be started.

[0022] Optionally, determining the startup type according to the coolant temperature includes:

[0023] comparing the coolant temperature to a threshold temperature;

[0024] If the coolant temperature is higher than or equal to the threshold temperature, the startup type is confirmed to be a normal temperature startup mode;

[0025] If the coolant temperature is lower than the threshold temperature, the startup type is confirmed to be the cold start mode.

[0026] Optionally, determining the actual power of the electric heater according to the output power and the required power of the electric heater includes:

[0027] comparing the output power and the required power;

[0028] If the required power is greater than or equal to the output power, determining the required power as the actual power;

[0029] If the required power is less than the output power, the output power is determined as the actual power.

[0030] A second aspect of the present application provides a low-temperature starting device for a battery, comprising:

[0031] a startup type confirmation module configured to: detect a current power level of the power battery and a coolant temperature of the fuel cell, and determine a startup type of the fuel cell based on the current power level and the coolant temperature;

[0032] an output power confirmation module, configured to: if the startup type is a cold start mode, start the fuel cell and determine the output power of the fuel cell;

[0033] an actual power confirmation module, configured to: determine the actual power of the electric heater according to the output power and the required power of the electric heater;

[0034] a heating module configured to: control the electric heater to heat the coolant according to the actual power, and monitor the coolant temperature in real time;

[0035] The startup state module is configured to: when the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

[0036] 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.

[0037] The fourth aspect of the present application provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable a computer to execute the method provided in the first aspect of the present application.

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

[0039] As can be seen from the above, the low-temperature starting method, device, electronic device, storage medium and vehicle of the battery provided in the present application determine the starting type of the fuel cell according to the current power and coolant temperature. If the starting type is the cold start mode, the fuel cell is started and the output power of the fuel cell is determined. The actual power of the electric heater is determined according to the output power and the required power of the electric heater. The electric heater is controlled to heat the coolant according to the actual power, and the coolant temperature is monitored in real time. When the coolant temperature reaches the preset temperature threshold, the fuel cell startup is completed and power supply to the electric heater is stopped. By utilizing the electric heater to consume the output power of the fuel cell, the problem of overcharging of the power battery under low temperature conditions is avoided. The cooling liquid and the power battery are heated, the charging power of the power battery is increased, and the power battery is charged. This solves the problem that the vehicle cannot be powered on when the fuel cell reaches the cold start condition and the charging power of the power battery is less than the output power of the fuel cell. 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 a low-temperature starting method for a battery according to an embodiment of the present application;

[0042] Figure 2 A flowchart for determining the startup type for an embodiment of the present application;

[0043] Figure 3 This is a flow chart for determining the vehicle power-on status according to an embodiment of the present application;

[0044] Figure 4 This is a flow chart of an embodiment of the present application for determining whether a fuel cell needs to be started;

[0045] Figure 5 This is a flow chart of determining the startup type according to the coolant temperature in an embodiment of the present application;

[0046] Figure 6 Flowchart for determining actual power according to an embodiment of the present application;

[0047] Figure 7 This is a schematic structural diagram of a low-temperature starting device for a battery according to an 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, 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.

[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 required power is small and the power battery has no recharging capability (the power battery's charging power is low, even 0KW). If the fuel cell is started, the fuel cell's output power will over-charge the power battery, which may reduce the power battery's life. Therefore, for safety reasons, the fuel cell start-up is not supported at this time, which will cause the vehicle's low-temperature cold start to fail, causing customer complaints.

[0053] The low-temperature starting method of the battery provided in the embodiment of the present application is that when the power battery temperature is lower than -20°C and the fuel cell temperature is lower than 5°C, if the power battery power is higher than the fuel cell starting threshold, the vehicle is powered on purely by electricity; if the power battery power is lower than the fuel cell starting threshold, the vehicle is powered on purely by electricity and the fuel cell is started. Since the fuel cell will output power to the outside during the startup process (from 0kW to 10kW and then maintain a stable output of 10kW), and the power battery cannot be charged due to the low temperature at this time, an electric heater is added to consume the output power of the fuel cell, thereby avoiding the problem of overcharging the power battery under low temperature conditions. At the same time, the thermal management circuit is heated by the electric heater, so that the power battery is quickly heated to meet the net power consumption of the fuel cell, thereby realizing charging of the power battery, and solving the problem that the vehicle cannot be powered on when the fuel cell reaches the cold start condition and the power battery charging power is less than the fuel cell output power. This is now explained in conjunction with the following specific embodiments.

[0054] In some embodiments, after the user performs a power-on operation, the current charge level of the power battery needs to be detected. If the current charge level is less than or equal to a preset power-off charge level, the power battery is determined to be too low, the power-on process is stopped, and the driver is notified of the low power battery charge. If the current charge level is greater than the preset power-off charge level, the current charge level is compared with a fuel cell startup threshold. If the current charge level is greater than the startup threshold, the power battery is sufficient, and pure electric power-on is performed. If the current charge level is less than or equal to the startup threshold, the power battery is insufficient, and the fuel cell needs to be started. If the coolant temperature is greater than a 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 perform a normal temperature start. If the coolant temperature is less than or equal to the preset temperature threshold at this time, it is determined that the coolant temperature meets the cold start condition of the fuel cell, and the fuel cell is controlled to perform a low-temperature cold start. After the low-temperature cold start of the fuel cell, the startup completion status and output power of the fuel cell are monitored in real time. Before the fuel cell startup is completed, the entire vehicle is heated according to the larger value of the output power and the required power of the electric heater until the coolant temperature reaches the preset temperature threshold, confirming that the fuel cell startup is complete, and heating is performed according to the required power.

[0055] In some embodiments, as Figure 1 As shown, a low-temperature starting method for a battery includes:

[0056] Step 100: Detect the current power level of the power battery and the coolant temperature of the fuel cell, and determine the startup type of the fuel cell according to the current power level and the coolant temperature.

[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 vehicle is not powered on by the central control panel (IP). If the current power level 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 fully powered on, the current power level of the power battery is continuously detected. When the current power level of the power battery reaches the fuel cell startup threshold, the central control switch module (CCU) requests the fuel cell to start and sends a startup request to the fuel control unit (FCU). After receiving the startup request from the central control switch module (CCU), the fuel control unit (FCU) 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 startup and determines the startup type to be the normal temperature startup mode. If the coolant temperature is less than or equal to 5°C, the fuel cell performs a low temperature cold start and determines the startup type to be the cold start mode. Then, the fuel control unit (FCU) sends the fuel cell startup type to the central control switch module (CCU) and controls the fuel cell to start according to the startup type. After the fuel cell battery is started, the fuel control unit (FCU) feeds back the startup completion status of the fuel cell to the central control switch module (CCU) in real time.

[0058] Step 200: If the start-up type is a cold start mode, start the fuel cell and determine the output power of the fuel cell.

[0059] In this step, the central control switch module (CCU) receives the fuel cell startup type feedback from the fuel control unit (FCU) and determines whether the fuel cell is in cold start mode. It then sends a flag corresponding to the startup type to the vehicle integration unit (VIU). If the fuel cell startup type is normal temperature startup mode, the fuel cell normal temperature startup status is sent to the vehicle integration unit (VIU), and the vehicle integration unit (VIU) requests and consumes power based on its own thermal management requirements. If the startup type has been determined to be cold start mode, due to the characteristics of the fuel cell, the external output power of the fuel cell increases from 0kW to 10kW during the cold start process and then maintains a stable output of 10kW. At this time, the power battery cannot be charged due to the low temperature. Therefore, it is necessary to monitor the output power of the fuel cell in real time to facilitate the subsequent more reasonable allocation of the output power based on the output power. It should be noted that the output power of the fuel cell can exceed 10kW based on the driver's driving needs. However, to protect the power battery and fuel cell, the maximum output power value cannot exceed the sum of the rated power of the electric heater and the charging power of the power battery at the current temperature.

[0060] Step 300: Determine the actual power of the electric heater according to the output power and the required power of the electric heater.

[0061] In this step, the output power of the fuel cell and the required power of the electric heater are compared. If the output power of the fuel cell is greater than the required power of the electric heater, the output power of the fuel cell is used as the actual output power of the electric heater. It should be noted that the output power value at this time is less than or equal to the rated power of the electric heater. If there is a special case where the output power is greater than the rated power, the rated power is used as the actual power of the electric heater, and the remaining output power is used to charge the power battery to avoid damage to the electric heater; if the output power of the fuel cell is less than or equal to the required power of the electric heater, the required power of the electric heater is used as the actual power. At this time, the output power of the fuel cell needs to be power compensated as the actual output power of the electric heater, so that the power battery and fuel cell can be quickly heated up to complete the cold start.

[0062] Step 400: Control the electric heater to heat the coolant according to the actual power, and monitor the coolant temperature in real time.

[0063] In this step, exemplarily, if the start-up type of the fuel cell is the normal temperature start-up mode, the central control switch module CCU sends the normal temperature start-up status of the fuel cell to the vehicle integrated unit VIU, and the vehicle integrated unit VIU requests and consumes power according to the thermal management requirements of the vehicle; if the fuel is in the low temperature cold start mode, the central control switch module CCU sends the "thermal management power consumption support" flag to the vehicle integrated unit VIU, and the vehicle integrated unit VIU makes a power request based on the larger power between the output power of the fuel cell in the fuel control unit FCU and the power requirement of its own thermal management, and consumes the actual power requested by the electric heater. The vehicle integrated unit VIU controls the electric heater to operate according to the actual power, provides heat to the entire vehicle, heats the coolant and power battery of the fuel cell through the thermal cycle of the entire vehicle, and monitors the coolant temperature of the fuel cell in real time to determine the exit time of the cold start mode and the startup completion status of the fuel cell.

[0064] Step 500: When the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

[0065] In this step, illustratively, if the central control switch module CCU stops sending the "thermal management power consumption support" flag during the vehicle integrated unit VIU's execution of the "thermal management power consumption support" process, it indicates that the cold start mode has been exited and the normal temperature start mode has been entered. The central control switch module CCU then requests and consumes power based on its own thermal management requirements. As long as the power battery temperature exceeds -15°C, the cold start mode is exited. However, the fuel cell startup is not considered complete until the coolant temperature reaches a preset temperature threshold of 40°C. Optionally, when the fuel cell startup is complete, the connection between the power battery, fuel cell coolant, and the thermal circulation system can be shut down. Alternatively, the connection between the power battery, fuel cell coolant, and the thermal circulation system can be shut down after the temperature reaches a certain value to prevent the power battery and fuel cell from overheating.

[0066] To summarize, the low-temperature starting method of the battery provided in the embodiment of the present application is that when the power battery temperature is lower than -20°C and the fuel cell temperature is lower than 5°C, if the power battery power is lower than the fuel cell starting threshold, the vehicle is powered on purely electrically and the fuel cell is started. Since the fuel cell will output power to the outside during the startup process (from 0kW to 10kW and then maintain a stable output of 10kW), and the power battery cannot be charged due to the low temperature at this time, and the vehicle's required power is relatively small at this time (generally less than 1010kW), the output power of the fuel cell will overshoot the power battery. Therefore, in the embodiment of the present application, the output power of the fuel cell is consumed by adding an electric heater, thereby avoiding the problem of overcharging of the power battery under low temperature conditions. At the same time, the thermal management circuit is heated by the electric heater, so that the power battery is quickly heated to meet the net power consumption of the fuel cell, thereby realizing charging of the power battery, solving the problem that the vehicle cannot be powered on when the fuel cell reaches the cold start condition and the power battery charging power is less than the fuel cell output power.

[0067] In some embodiments, as Figure 2 As shown, the fuel cell startup type is determined based on the current power and coolant temperature, including:

[0068] Step 110: Determine the vehicle power status based on the current power level.

[0069] In this step, the central control switch module first needs to detect the state of charge (SOC) of the power battery to determine the current power level. The state of charge is the percentage of the capacity that can be released in the current battery according to the specified discharge conditions to the available capacity. This percentage can be equated with the current power level of the power battery. For example, if the current power level of the power battery is less than or equal to 5%, it is considered that the power battery has a low power level and the vehicle cannot be powered on. If the current power level of the power battery is greater than 5%, the central control switch module CCU controls the vehicle to perform pure electric power-on and determines that the vehicle is powered on successfully. The reason why the power battery needs to have a certain amount of power is that during the process of starting the fuel cell, the fuel cell needs the power battery to output 16kW of power to meet the fuel cell startup requirements. However, the fuel cell startup is completed only when the fuel cell coolant temperature reaches 40°C.

[0070] Step 120: If the vehicle is powered on successfully, determine whether the fuel cell needs to be started based on the current power level.

[0071] In this step, if the vehicle is powered on successfully, the current power level of the power battery will continue to be detected in real time (the power-on operation may cause the power level of the power battery to decrease, but under normal circumstances, the power-on operation will not change the current power level of the power battery). When the current power level of the power battery is lower than the fuel cell start-up threshold, it is determined that the fuel cell needs to be started. The value of the fuel cell start-up threshold is 5% higher than the power-off power level. Taking the start-up threshold of 10% as an example, when the current power level of the power battery exceeds 10%, it means that the power battery can provide all the power used for vehicle driving. When the power level of the power battery reaches 10%, it means that the power battery can no longer supply energy to the vehicle alone. At this time, it is necessary to start the fuel cell to power the vehicle, and at the same time recover the output power of the fuel cell to charge the power battery.

[0072] Step 130: If the fuel cell needs to be started, the startup type is determined according to the coolant temperature.

[0073] In this step, exemplarily, 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. After the fuel cell is started, the fuel control unit FCU feeds back the start-up completion status of the fuel cell to the central control switch module CCU in real time.

[0074] In some embodiments, as Figure 3 As shown, the vehicle power status is determined based on the current power level, including:

[0075] Step 111: Compare the current power level with the power-down power level.

[0076] In this step, the current power level of the power battery is detected in real time, a preset power-down power level is obtained, and the current power level and the power-down power level are compared.

[0077] Step 112: If the current battery level is less than or equal to the power-off level, a low battery prompt is given and the vehicle fails to power on.

[0078] In this step, for example, if the current power level of the power battery is 4% and the preset power-off level is 5%, the power battery is low at this time, and the central control switch module CCU cannot control the vehicle to continue the power-on process, and prompts the driver through the instrument that "the power battery is low and the vehicle cannot be powered on". Optionally, a low power flag can be set on the instrument. When the power is healthy, the flag will only display the current power value and the display color is green. When the power is lower than 5%, the display color will change to red, and a voice prompt of "the power battery is low and the vehicle cannot be powered on" will be given. The vehicle cannot be powered on at this time.

[0079] Step 113: If the current power level is greater than the power-down level, pure electric power-up is performed and the vehicle is successfully powered on.

[0080] In this step, for example, if the current power level of the power battery is 7% and the preset power-off level is 5%, the power level of the power battery can meet the power-on requirement. After the power-on is successful, 16kW of power will continue to be provided to the fuel cell to meet the startup of the fuel cell.

[0081] In some embodiments, as Figure 4 As shown, if the vehicle is powered on successfully, the fuel cell needs to be started based on the current power level, including:

[0082] Step 121: Compare the current power level with the fuel cell startup threshold.

[0083] In this step, the current power level of the power battery is detected in real time, a pre-set start threshold is obtained, and the current power level is compared with the start threshold.

[0084] Step 122: If the current power level is greater than the start threshold, it is determined that the fuel cell does not need to be started.

[0085] In this step, for example, if the central control switch module CCU detects that the current power is 15% and the pre-set start threshold is 10%, the current power is greater than the start threshold, indicating that the power battery can provide all the power used for vehicle driving alone, and it is determined that there is no need to start the fuel cell.

[0086] Step 123: If the current power level is less than or equal to the start threshold, it is determined that the fuel cell needs to be started.

[0087] In this step, for example, if the central control switch module CCU detects that the current power level is 7% and the pre-set start threshold is 10%, and the current power level is less than the start threshold, it means that the power of the power battery can no longer supply energy to the vehicle alone. At this time, it is necessary to start the fuel cell to power the vehicle for fuel-electric hybrid drive. At the same time, the power battery recovers part of the output power of the fuel cell to charge the power battery.

[0088] In some embodiments, as Figure 5 As shown, the start type is determined based on the coolant temperature, including:

[0089] Step 131 : Compare the coolant temperature with a threshold temperature.

[0090] In this step, the coolant temperature of the fuel cell is detected in real time, a pre-set threshold temperature is obtained, and the current power level is compared with the threshold temperature.

[0091] Step 132: If the coolant temperature is higher than or equal to the threshold temperature, the startup type is confirmed to be the normal temperature startup mode.

[0092] In this step, illustratively, if the detected coolant temperature of the fuel cell is 10° C. and the threshold temperature is 5° C., the coolant temperature is higher than the threshold temperature, and the fuel cell performs normal temperature startup, and the startup type is determined to be normal temperature startup mode.

[0093] Step 133: If the coolant temperature is lower than the threshold temperature, the startup type is confirmed to be the cold start mode.

[0094] In this step, exemplarily, if the detected coolant temperature of the fuel cell is 3°C and the threshold temperature is 5°C, the coolant temperature is lower than the threshold temperature. 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.

[0095] In some embodiments, as Figure 6 As shown, the actual power of the electric heater is determined according to the output power and the required power of the electric heater, including:

[0096] Step 310: Compare the output power and the required power.

[0097] In this step, the output power of the fuel cell and the required power of the electric heater are detected in real time, and the output power and the required power are compared.

[0098] Step 320: If the required power is greater than or equal to the output power, the required power is determined as the actual power.

[0099] In this step, for example, if the required power of the electric heater is 8KW and the output power of the fuel cell at the current moment is 6KW, the required power of the electric heater of 8KW is used as the actual power. At this time, the output power of the fuel cell needs to be compensated by 2KW, and then 8KW is used as the actual output power of the electric heater, so that the power battery and the fuel cell can be quickly heated up to complete the cold start, wherein the compensated power can be provided by the power battery.

[0100] Step 330: If the required power is less than the output power, the output power is determined as the actual power.

[0101] In this step, for example, if the required power of the electric heater is 4KW and the output power of the fuel cell at the current moment is 9KW, the output power of the fuel cell at the current moment of 9KW is used as the actual power. If the electric heater does not consume all the output power, then the remaining output power will be used to charge the power battery. However, due to the low temperature of the power battery, its charging power is small or even 0KW. At this time, if the power battery is charged, it is likely to cause overcharging of the power battery and damage the power battery. Therefore, a larger output power is needed as the actual power of the electric heater to ensure the safety of the power battery.

[0102] 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.

[0103] 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.

[0104] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides a low-temperature starting device for a battery.

[0105] refer to Figure 7 , the low-temperature starting device of the battery comprises:

[0106] The startup type confirmation module 10 is configured to: detect the current power of the power battery and the coolant temperature of the fuel cell, and determine the startup type of the fuel cell according to the current power and the coolant temperature;

[0107] The output power confirmation module 20 is configured to: if the startup type is a cold start mode, start the fuel cell and determine the output power of the fuel cell;

[0108] The actual power confirmation module 30 is configured to: determine the actual power of the electric heater according to the output power and the required power of the electric heater;

[0109] The heating module 40 is configured to: control the electric heater to heat the coolant according to the actual power, and monitor the coolant temperature in real time;

[0110] The startup state module 50 is configured to: when the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

[0111] 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.

[0112] The device of the above embodiment is used to implement the low-temperature starting method of the corresponding battery in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0113] 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 low-temperature starting method of the battery described in any of the above embodiments is implemented.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.).

[0119] 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 ).

[0120] 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.

[0121] The electronic device of the above embodiment is used to implement the 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.

[0122] 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 low-temperature starting method of the battery as described in any of the above embodiments.

[0123] 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.

[0124] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the 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.

[0125] It should be noted that the embodiments of the present application can be further described in the following manner:

[0126] In some embodiments, after the driver inserts the car key into the keyhole and turns the car key to the "ON" position, that is, after the driver performs the power-on operation, the central control switch module (Central Computing When the fuel cell vehicle control unit (CCU) receives a power-on signal, the central control switch module begins to detect the state-of-charge (SOC) of the power battery to determine the current charge level. If the current charge level of the power battery is less than or equal to 5%, the central control switch module sends a display message of "low charge level of the power battery, vehicle cannot be powered on" to the instrument panel. If the current charge level 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 charge level of the power battery. When the current charge level of the power battery reaches the fuel cell start-up threshold, a start request is sent to the fuel control unit. If the current charge level of the power battery does not reach the fuel cell start-up threshold, the central control switch module continues to detect the current charge level of the power battery until the current charge level reaches the start-up threshold. Then, the central control switch module receives the start-up type information sent by the fuel cell and determines whether the start-up type information is a low-temperature cold start. If not, the central control switch module sends the fuel cell normal-temperature start status to the vehicle integrated unit. If so, the central control switch module sends a power consumption support flag to the electric heater until the fuel cell start-up completion information is received, at which time a stop request is sent to the vehicle integrated unit.

[0127] 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 detects the coolant temperature of the fuel cell. If the coolant temperature is greater than 5°C, the fuel control unit controls the fuel cell to perform normal temperature start-up and sends the start-up type information of normal temperature start-up to the central control switch module; if the coolant temperature is less than or equal to 5°C, the fuel control unit controls the fuel cell to perform low-temperature cold start-up and sends the start-up type information of low-temperature cold start-up to the central control switch module; then, the start-up completion status of the fuel cell is monitored in real time until the coolant temperature reaches the preset temperature threshold, and the fuel cell start-up completion information is sent to the central control switch module.

[0128] In some embodiments, when the vehicle integrated unit receives a power consumption support flag, it consumes the larger value between the actual output power of the fuel cell and its own required power until a stop request is received, and controls the electric heater to heat according to its own required power; when the normal temperature start state is received, it controls the electric heater to heat according to its own required power.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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 low-temperature starting method for a battery, characterized in that: include: detecting a current charge level of the power battery and a coolant temperature of the fuel cell, and determining a startup type of the fuel cell according to the current charge level and the coolant temperature; If the startup type is a cold start mode, starting the fuel cell and determining the output power of the fuel cell; determining the actual power of the electric heater according to the output power and the required power of the electric heater; wherein the actual power of the electric heater is determined according to the output power and the required power of the electric heater; comparing the output power and the required power; If the required power is greater than or equal to the output power, the required power is determined as the actual power; the required power includes the output power and the compensation power of the power battery, and the compensation power is the difference between the required power and the output power; If the required power is less than the output power, and the output power is less than or equal to the rated power of the electric heater, the output power is determined as the actual power; If the required power is less than the output power, and the output power is greater than the rated power of the electric heater, the rated power is determined as the actual power, and the difference between the output power and the rated power is determined as the charging power of the power battery; controlling the electric heater to heat the coolant according to the actual power, and monitoring the coolant temperature in real time; When the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

2. The method according to claim 1, characterized in that The determining the startup type of the fuel cell according to the current power and the coolant temperature includes: determining a vehicle power-on status based on the current power level; If the vehicle is powered on successfully, determining whether to start the fuel cell according to the current power level; If the fuel cell needs to be started, the start-up type is determined according to the coolant temperature.

3. The method according to claim 2, characterized in that The determining of the vehicle power-on status according to the current power level includes: Comparing the current power level with the power-down power level; If the current battery level is less than or equal to the power-down level, a low battery reminder is given and the vehicle fails to power on. If the current power level is greater than the power-down power level, pure electric power-up is performed and the vehicle is successfully powered on.

4. The method according to claim 2, characterized in that If the vehicle is powered on successfully, determining whether the fuel cell needs to be started according to the current power level includes: comparing the current power level with a start-up threshold of the fuel cell; If the current power level is greater than the start threshold, determining that the fuel cell does not need to be started; If the current power level is less than or equal to the start-up threshold, it is determined that the fuel cell needs to be started.

5. The method according to claim 1, wherein The determining the startup type according to the coolant temperature includes: comparing the coolant temperature to a threshold temperature; If the coolant temperature is higher than or equal to the threshold temperature, the startup type is confirmed to be a normal temperature startup mode; If the coolant temperature is lower than the threshold temperature, the startup type is confirmed to be the cold start mode.

6. A low-temperature starting device for a battery, characterized in that: include: a startup type confirmation module configured to: detect a current power level of the power battery and a coolant temperature of the fuel cell, and determine a startup type of the fuel cell based on the current power level and the coolant temperature; an output power confirmation module, configured to: if the startup type is a cold start mode, start the fuel cell and determine the output power of the fuel cell; an actual power confirmation module, configured to: determine the actual power of the electric heater according to the output power and the required power of the electric heater; wherein the actual power of the electric heater is determined according to the output power and the required power of the electric heater; comparing the output power and the required power; If the required power is greater than or equal to the output power, the required power is determined as the actual power; the required power includes the output power and the compensation power of the power battery, and the compensation power is the difference between the required power and the output power; If the required power is less than the output power, and the output power is less than or equal to the rated power of the electric heater, the output power is determined as the actual power; If the required power is less than the output power, and the output power is greater than the rated power of the electric heater, the rated power is determined as the actual power, and the difference between the output power and the rated power is determined as the charging power of the power battery; a heating module configured to: control the electric heater to heat the coolant according to the actual power, and monitor the coolant temperature in real time; The startup state module is configured to: when the coolant temperature reaches a preset temperature threshold, the fuel cell startup is completed.

7. 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 5 is implemented.

8. A computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 5.

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

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