Thermal management method and device for automobile power battery and electronic equipment

Abstract

The embodiment of the invention provides an automobile power battery thermal management method and device and electronic equipment, and relates to the technical field of fuel cell automobiles. The method comprises the steps that the battery temperature of a power battery in the fuel cell automobile is collected in real time based on the first temperature sensor; a target temperature interval of the battery temperature in a preset battery temperature range is judged, the preset battery temperature range comprises a plurality of temperature intervals, and each temperature interval corresponds to one thermal management control strategy; and controlling the heat dissipation module or the heating module to perform heat management on the power battery based on a heat management strategy corresponding to the target temperature interval. The dynamic thermal management can be better carried out on the power battery of the fuel cell automobile, and the thermal management efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell vehicles, and more particularly, to a method, device, and electronic device for thermal management of an automotive power battery. Background Art

[0002] The power architecture of a fuel cell vehicle is generally a hybrid power system, with the fuel cell as the main energy source, continuously supplying energy through the hydrogen-oxygen electrochemical reaction; the power battery undertakes auxiliary functions such as peak power compensation, energy buffering, and cold start. The two work together to build an efficient electric drive system. In extremely low-temperature environments, the output power of the fuel cell increases slowly, and the vehicle generally relies on the power battery for energy supply during the initial stage of driving. Therefore, thermal management of the power battery in a low-temperature environment is very important.

[0003] In the current technology, the thermal management of the power battery of a fuel cell vehicle often relies on the regulation of a single device, and the thermal management efficiency needs to be improved. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a method, device, and electronic device for thermal management of an automotive power battery, which can at least partially solve the above technical problems.

[0005] Embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a method for thermal management of an automotive power battery, which is applied to a controller of a thermal management system for a fuel cell vehicle power battery. The thermal management system for the fuel cell vehicle power battery further includes a heating subsystem, a cooling subsystem, and a temperature sensor. The heating subsystem includes a plurality of heating modules, the cooling subsystem includes a plurality of cooling modules, and the temperature sensor includes a first temperature sensor. Each of the heating modules, each of the cooling modules, and the temperature sensor is communicatively connected to the controller. The method includes:

[0007] Based on the first temperature sensor, the battery temperature of the power battery in the fuel cell vehicle is collected in real time.

[0008] Determine the target temperature range in which the battery temperature is located within a preset battery temperature range. The preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy.

[0009] Based on the thermal management strategy corresponding to the target temperature range, control the cooling module or the heating module to perform thermal management on the power battery.

[0010] Optionally, the preset battery temperature range includes a first temperature range, the heating module includes a heating, ventilation, and air conditioning (HVAC) system and a positive temperature coefficient (PTC) heater, and controlling the heat management of the power battery by the heat dissipation module or the heating module based on the heat management strategy corresponding to the target temperature range includes:

[0011] If the target temperature range in which the battery temperature is located is the first temperature range, control the HVAC system to turn on in the heating mode and determine the pulse width modulation (PWM) duty cycle of the PTC heater;

[0012] Control the PTC heater to heat based on the PWM duty cycle.

[0013] Optionally, the temperature sensor further includes a second temperature sensor, and determining the PWM duty cycle of the PTC heater includes:

[0014] Collect the first inlet water temperature of the PTC heater based on the second temperature sensor;

[0015] Call a preset duty cycle mapping table, and determine the PWM duty cycle corresponding to the first inlet water temperature in the preset duty cycle mapping table according to the first inlet water temperature.

[0016] Optionally, the preset battery temperature range further includes a second temperature range, the second temperature range is greater than the first temperature range, and controlling the heat management of the power battery by the heat dissipation module or the heating module based on the heat management strategy corresponding to the target temperature range further includes:

[0017] If the target temperature range in which the battery temperature is located is the second temperature range, adjust the PWM duty cycle of the PTC heater to a preset PWM duty cycle and maintain the operating state of the HVAC system.

[0018] Optionally, the preset battery temperature range further includes a third temperature range, the third temperature range is greater than the second temperature range, and controlling the heat management of the power battery by the heat dissipation module or the heating module based on the heat management strategy corresponding to the target temperature range further includes:

[0019] If the target temperature range in which the battery temperature is located is the third temperature range, turn off the PTC heater and maintain the operating state of the HVAC system.

[0020] Optionally, the preset battery temperature range further includes a fourth temperature range, the fourth temperature range is greater than the third temperature range, the heat dissipation module includes a refrigerant cooling circuit heat dissipation module, and based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes:

[0021] If the target temperature range where the battery temperature is located is the fourth temperature range, control the refrigerant cooling circuit heat dissipation module to start to dissipate heat from the power battery.

[0022] Optionally, the temperature sensor further includes a third temperature sensor, the heat dissipation module further includes an auxiliary cooling circuit heat dissipation module, and the method further includes:

[0023] If the target temperature range where the battery temperature is located is the fourth temperature range, collect the second inlet water temperature of the auxiliary cooling circuit heat dissipation module based on the third temperature sensor;

[0024] Judge whether the second inlet water temperature is greater than or equal to a preset inlet water temperature threshold;

[0025] If so, control the auxiliary cooling circuit heat dissipation module to start to dissipate heat from the power battery.

[0026] Optionally, the refrigerant cooling circuit heat dissipation module includes a compressor, the temperature sensor further includes a fourth temperature sensor, the auxiliary cooling circuit heat dissipation module includes a large circulation heat dissipation mode and a small circulation heat dissipation mode, and the method further includes:

[0027] Obtain the ambient temperature based on the fourth temperature sensor and obtain the compressor speed of the compressor;

[0028] If the compressor speed is not 0 and the ambient temperature is greater than or equal to a preset ambient temperature threshold, control the auxiliary cooling circuit heat dissipation module to operate in the small circulation heat dissipation mode;

[0029] If the ambient temperature is less than the preset ambient temperature threshold and the compressor speed is 0, control the auxiliary cooling circuit heat dissipation module to operate in the large circulation heat dissipation mode.

[0030] Second aspect, an embodiment of the present invention provides an automotive power battery thermal management device, which is applied to a controller of a fuel cell vehicle power battery thermal management system. The fuel cell vehicle power battery thermal management system further includes a heating subsystem, a heat dissipation subsystem, and a temperature sensor. The heating subsystem includes a plurality of heating modules, the heat dissipation subsystem includes a plurality of heat dissipation modules, and the temperature sensor includes a first temperature sensor. Each of the heating modules, each of the heat dissipation modules, and the temperature sensor are respectively communicatively connected to the controller; the automotive power battery thermal management device includes:

[0031] A battery temperature acquisition unit, configured to acquire the battery temperature of the power battery in the fuel cell vehicle in real time based on the first temperature sensor;

[0032] A target temperature range determination unit, configured to determine the target temperature range in which the battery temperature is located in a preset battery temperature range. The preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy;

[0033] A battery thermal management unit, configured to control the heat dissipation module or the heating module to perform thermal management on the power battery based on the thermal management strategy corresponding to the target temperature range.

[0034] Third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method described in any one of the above are implemented.

[0035] Fourth aspect, an embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium includes a computer program. When the computer program runs, it controls the server where the computer-readable storage medium is located to implement the steps of the method described in any one of the above.

[0036] The beneficial effects of the embodiments of the present invention include, for example:

[0037] By providing a heating subsystem including a plurality of heating modules and a heat dissipation subsystem including a plurality of heat dissipation modules in the fuel cell vehicle. When it is monitored that the power battery is in different temperature ranges, different thermal management strategies are adopted to respectively control each heat dissipation module / heating module to dissipate heat / heat the power battery, thereby realizing dynamic adjustment of the power battery temperature and improving the thermal management efficiency. Description of the Drawings

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0039] Figure 1 A block diagram of an electronic device provided for an embodiment of the present invention;

[0040] Figure 2 A flowchart of steps of a method for thermal management of an automotive power battery provided for an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of a preset battery temperature range provided for an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of a preset duty ratio mapping table provided for an embodiment of the present invention;

[0043] Figure 5 An architecture diagram of a refrigerant cooling circuit heat dissipation module and an auxiliary cooling circuit heat dissipation module provided for an embodiment of the present invention;

[0044] Figure 6 An architecture diagram of an automotive power battery thermal management device provided for an embodiment of the present invention.

[0045] Icons: 100 - Electronic device; 110 - Memory; 120 - Processor; 130 - Communication module; 300 - Automotive power battery thermal management device; 301 - Battery temperature acquisition unit; 302 - Target temperature range determination unit; 303 - Battery thermal management unit. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0049] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0050] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0051] Driven by the dual impetus of energy transformation and environmental protection requirements, fuel cell vehicles are becoming a key direction for the low-carbon development of the automotive industry. Its hybrid architecture uses a fuel cell as the main energy source, continuously supplying energy through the hydrogen-oxygen electrochemical reaction. The power battery undertakes auxiliary functions such as peak power compensation, energy buffering, and cold start. The two work together to build an efficient electric drive system. However, in an extremely low-temperature environment, the output power of the fuel cell increases slowly. In the initial stage of vehicle driving, it relies on the power battery for energy supply. Therefore, the thermal management of the power battery in a low-temperature environment is very important.

[0052] In the prior art, in a low-temperature environment, in order to improve the working efficiency of the power battery, the following heating technologies are mainly adopted:

[0053] PTC (Positive Temperature Coefficient) heating technology: The PTC heater has the characteristic of automatic temperature control and can automatically adjust the heating power according to the battery temperature. The PTC heating system is used to preheat the battery to improve the charge and discharge performance of the battery at low temperatures.

[0054] Motor waste heat utilization technology: During the operation of a fuel cell vehicle, a large amount of heat is generated by the motor and the motor controller. Through a reasonable thermal management system design, this part of the heat can be recovered and used to heat the power battery.

[0055] External heating film technology: A heating film is laid on the surface of the battery, and the battery temperature is increased by heating with an external power source.

[0056] In a low-temperature environment and when the power battery is at a high temperature, the currently commonly used heat dissipation technologies include:

[0057] Air-cooled heat dissipation technology: Air is blown over the surface of the power battery by a fan to take away heat; Liquid-cooled heat dissipation technology: A coolant is circulated between the battery modules to take away heat; Heat pipe heat dissipation technology: The phase change process of the working fluid in the heat pipe is used to transfer heat.

[0058] However, most current solutions adopt the above-mentioned single heating / cooling method, and there is no thermal management collaborative control strategy that coordinates the various methods, which means that the thermal management efficiency of current fuel cell vehicle power batteries needs to be improved.

[0059] Based on the above situation, the embodiments of the present invention provide a method, device and electronic equipment for thermal management of automotive power batteries, which can effectively alleviate the above technical problems.

[0060] Please refer to Figure 1 , is a block diagram of an electronic device 100 provided by the present application. The electronic device 100 may be a device capable of performing data processing, which is not limited in this embodiment. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, the processor 120, and the communication module 130. Each component is electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other via one or more communication buses or signal lines.

[0061] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc.

[0062] The processor 120 is used to read / write data or programs stored in the memory and execute corresponding functions.

[0063] The communication module 130 is used to establish a communication connection between the server and other communication terminals through the network, and to send and receive data through the network.

[0064] It should be understood that Figure 1 The structure shown is only a schematic diagram of the structure of the electronic device 100. The electronic device 100 may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown. Figure 1 The components shown in the figure can be implemented by hardware, software or a combination thereof. The electronic device 100 can be arranged in other devices or as an independent device.

[0065] An embodiment of the present invention provides a method for thermal management of an automotive power battery, which is applied to a controller of a fuel cell vehicle power battery thermal management system. The fuel cell vehicle power battery thermal management system further includes a heating subsystem, a cooling subsystem, and a temperature sensor. The heating subsystem includes a plurality of heating modules, the cooling subsystem includes a plurality of cooling modules, and the temperature sensor includes a first temperature sensor. Each of the heating modules, each of the cooling modules, and the temperature sensor are respectively communicatively connected to the controller. The method includes the following steps as Figure 2 shown:

[0066] Step S110: Based on the first temperature sensor, the battery temperature of the power battery in the fuel cell vehicle is collected in real time.

[0067] Step S120: Determine the target temperature range in which the battery temperature is located within a preset battery temperature range. The preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy.

[0068] Step S130: Based on the thermal management strategy corresponding to the target temperature range, control the cooling module or the heating module to perform thermal management on the power battery.

[0069] In step S110, based on the first temperature sensor, the battery temperature of the power battery in the fuel cell vehicle is collected in real time.

[0070] The first temperature sensor may be a temperature sensor disposed at the power battery, used to monitor the temperature of the power battery in real time, and transmit the collected temperature back to the controller of the fuel cell vehicle. In the embodiment of the present invention, the controller of the fuel cell vehicle may be a general term for a plurality of sub-controllers. For example, an air-conditioning controller, a VCU (Vehicle Control Unit), an MCU (Microcontroller Unit), a BMS (Battery Management System), etc. are an abstract set, generally referring to an organization that receives signals, determines control logic according to the signals, and issues control instructions to each actuator based on the control logic.

[0071] After the fuel cell vehicle is started, the controller collects the temperature of the power battery in real time based on the first temperature sensor and transmits it back to the controller, so that the controller can perform the next step of processing according to the battery temperature feedback by the first temperature sensor.

[0072] In step S120, determine the target temperature range within the preset battery temperature range where the battery temperature is located. The preset battery temperature range includes multiple temperature ranges, and each temperature range corresponds to a thermal management control strategy.

[0073] A preset temperature range can be set, which contains multiple temperature ranges. Each temperature range corresponds to a thermal management control strategy. After the controller obtains the battery temperature, the temperature range where the battery temperature is located is the target temperature range, and the thermal management control strategy corresponding to this target temperature range is the strategy that the controller needs to control the heating module / cooling module to execute.

[0074] In step S130, based on the thermal management strategy corresponding to the target temperature range, control the cooling module or the heating module to perform thermal management on the power battery.

[0075] Suppose the preset temperature range includes three temperature ranges A, B, and C. The thermal management control strategy corresponding to A is to control three heating modules a, b, and c to heat; the thermal management control strategy corresponding to B is to only control heating module a to heat; the thermal management control strategy corresponding to C is to control cooling modules d, e, and f to dissipate heat. If the target temperature range is B, the controller controls heating module a to heat.

[0076] Optionally, the preset battery temperature range includes a first temperature range. The heating module includes a heating, ventilation, and air conditioning (HVAC) unit and a positive temperature coefficient (PTC) heater. The controlling the cooling module or the heating module to perform thermal management on the power battery based on the thermal management strategy corresponding to the target temperature range includes:

[0077] If the target temperature range where the battery temperature is located is the first temperature range, control the HVAC unit to turn on in the heating mode and determine the pulse width modulation (PWM) duty cycle of the PTC heater.

[0078] Control the PTC heater to heat based on the PWM duty cycle.

[0079] As Figure 3 shown, the first temperature range can be the temperature range with the lowest temperature (such as less than or equal to 7 °C). If the battery temperature is in the first temperature range, it indicates that the current temperature of the power battery is too low and the power battery needs to be heated quickly. Therefore, the HVAC unit can be controlled to turn on in the heating mode to heat the power battery, and at the same time, the PWM duty cycle of the PTC heater is determined, and the PTC heater is controlled to heat the power battery simultaneously with this PWM duty cycle.

[0080] Optionally, the temperature sensor further includes a second temperature sensor. The determining the pulse width modulation duty cycle of the PTC heater includes:

[0081] Collect the first inlet water temperature of the PTC heater based on the second temperature sensor.

[0082] Call a preset duty ratio mapping table, and determine the pulse width modulation duty ratio corresponding to the first inlet water temperature in the preset duty ratio mapping table according to the first inlet water temperature.

[0083] In an alternative embodiment, the first inlet water temperature of the PTC heater can be collected by a second temperature sensor arranged at the inlet of the PTC heater, and a preset duty ratio mapping table (as shown in Figure 4 ) stored in the memory is called, and the pulse width modulation duty ratio of the PTC heater is determined by looking up the table.

[0084] Optionally, the preset battery temperature range further includes a second temperature range, the second temperature range is greater than the first temperature range, and based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes:

[0085] If the target temperature range where the battery temperature is located is the second temperature range, then adjust the pulse width modulation duty ratio of the PTC heater to a preset pulse width modulation duty ratio and maintain the operating state of the HVAC.

[0086] As shown in Figure 3 , the second temperature range (such as 7-15 °C) can be a temperature range continuous with the first temperature range in the preset battery temperature range, and the minimum value of the second temperature range can be the maximum value of the first temperature range. If the battery temperature is in the second temperature range, that is, the target temperature range is the second temperature range, it is considered that at this time, the power battery still needs to be heated to maintain the best operating state of the power battery, but rapid heating is not required.

[0087] Therefore, the controller can make the HVAC continue to heat the power battery, and adjust the pulse width modulation duty ratio of the PTC heater to a smaller fixed value (preset pulse width modulation duty ratio, such as 5%) for operation.

[0088] Optionally, the preset battery temperature range further includes a third temperature range, the third temperature range is greater than the second temperature range, and based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes:

[0089] If the target temperature range where the battery temperature is located is the third temperature range, then turn off the PTC heater and maintain the operating state of the HVAC.

[0090] Still as shown in Figure 3For example, the third temperature range can be a temperature range that is continuous with the second temperature range in the preset battery temperature range (such as 15 - 36 °C), and the minimum value of the third temperature range can be the maximum value of the second temperature range.

[0091] When the battery temperature of the power battery falls within the third temperature range, it is considered that only the temperature of the power battery needs to be maintained from dropping at this time. Therefore, the controller can control the PTC heater to turn off, and only use the HVAC to maintain the battery temperature of the power battery.

[0092] In addition, it should be noted that regardless of whether the battery temperature of the power battery is in the first temperature range, the second temperature range, or the third temperature range, the controller can also heat the battery temperature of the power battery by means of water pump drive, that is, by adjusting the duty cycle signal of the water pump drive to change the liquid flow rate, thereby increasing the heating or cooling rate.

[0093] Optionally, the preset battery temperature range further includes a fourth temperature range, the fourth temperature range is greater than the third temperature range, the heat dissipation module includes a refrigerant cooling circuit heat dissipation module, and the controlling the heat dissipation module or the heating module to perform thermal management on the power battery based on the thermal management strategy corresponding to the target temperature range further includes:

[0094] If the target temperature range where the battery temperature is located is the fourth temperature range, control the refrigerant cooling circuit heat dissipation module to start to dissipate heat from the power battery.

[0095] Please refer to Figure 3 , the fourth temperature range can be a temperature range that is continuous with the third temperature range in the preset battery temperature range (such as greater than 36 °C), and the minimum value of the fourth temperature range can be the maximum value of the third temperature range.

[0096] If the battery temperature is in the fourth temperature range, it is considered that the power battery temperature is too high and needs to be cooled down. At this time, the controller can control the HVAC to start in the cooling mode, and at the same time turn on the refrigerant cooling circuit heat dissipation module as shown in Figure 5 to dissipate heat from the power battery.

[0097] Optionally, the temperature sensor further includes a third temperature sensor, the heat dissipation module further includes an auxiliary cooling circuit heat dissipation module, and the method further includes:

[0098] If the target temperature range where the battery temperature is located is the fourth temperature range, collect the second inlet water temperature of the auxiliary cooling circuit heat dissipation module based on the third temperature sensor.

[0099] Determine whether the second inlet water temperature is greater than or equal to a preset inlet water temperature threshold. If so, control the auxiliary cooling circuit heat dissipation module to start and dissipate heat from the power battery.

[0100] As Figure 5 shown, the auxiliary (BOP, Balance of Plant) cooling circuit heat dissipation module can be connected in series to the entire power battery cooling circuit through the water-cooled end of the heat exchanger. When the target temperature range of the battery temperature is the fourth temperature range, the controller controls the third temperature sensor arranged at the inlet of the auxiliary cooling circuit heat dissipation module to obtain the second inlet water temperature of the auxiliary cooling circuit heat dissipation module. If the second inlet water temperature is greater than or equal to the preset inlet water temperature threshold (such as 41 °C), it means that the refrigerant cooling circuit heat dissipation module is not sufficient to meet the current power battery heat dissipation requirement, and the controller turns on the auxiliary cooling circuit heat dissipation module to improve the heat dissipation capacity.

[0101] Optionally, the refrigerant cooling circuit heat dissipation module includes a compressor, the temperature sensor further includes a fourth temperature sensor, the auxiliary cooling circuit heat dissipation module includes a large circulation heat dissipation mode and a small circulation heat dissipation mode, and the method further includes:

[0102] Obtain the ambient temperature based on the fourth temperature sensor and obtain the compressor speed of the compressor.

[0103] If the compressor speed is not 0 and the ambient temperature is greater than or equal to the preset ambient temperature threshold, control the auxiliary cooling circuit heat dissipation module to operate in the small circulation heat dissipation mode.

[0104] If the ambient temperature is less than the preset ambient temperature threshold and the compressor speed is 0, control the auxiliary cooling circuit heat dissipation module to operate in the large circulation heat dissipation mode.

[0105] As Figure 5 shown, the large circulation heat dissipation mode of the auxiliary cooling circuit heat dissipation module is the cooling large circulation circuit, and the small circulation heat dissipation mode is the cooling small circulation circuit. In extreme working conditions, such as in high-altitude terrain, extremely low temperature (less than the preset ambient temperature threshold - 10 °C), and when the vehicle is climbing a slope at high speed, the electric compressor of the refrigerant cooling circuit heat dissipation module can be not working (i.e., the speed is 0). At this time, it is necessary to control the electric three-way valve of the auxiliary cooling circuit heat dissipation module to switch the auxiliary cooling circuit heat dissipation module to the large circulation heat dissipation mode to strengthen the heat dissipation of the power battery.

[0106] When the ambient temperature is greater than or equal to the preset ambient temperature threshold (such as - 10 °C) and the compressor speed is greater than 0, adjust the electric three-way valve of the auxiliary cooling circuit heat dissipation module to switch the auxiliary cooling circuit heat dissipation module to the small circulation heat dissipation mode.

[0107] Optionally, a safety protection mechanism can be set in the power battery thermal management system of a fuel cell vehicle. For example, when the first temperature sensor detects that the water temperature at the inlet of the PTC heater is greater than 65°C, all heating modules are directly turned off, and the HVAC is switched to the cooling mode. When it is detected that the actual opening degree of the electromagnetic expansion valve of the refrigerant cooling circuit heat dissipation module deviates from the opening degree of the control instruction issued by the controller by more than 15%, or the coolant flow rate is less than 80% of the set threshold, a fault signal is generated and an alarm is issued.

[0108] Based on the same inventive concept, as Figure 6 shown, an embodiment of the specification of the present invention provides a power battery thermal management device 300 for a vehicle, which is applied to a controller of a power battery thermal management system of a fuel cell vehicle. The power battery thermal management system of the fuel cell vehicle further includes a heating subsystem, a cooling subsystem, and a temperature sensor. The heating subsystem includes a plurality of heating modules, the cooling subsystem includes a plurality of cooling modules, and the temperature sensor includes a first temperature sensor. The power battery thermal management device for the vehicle includes:

[0109] A battery temperature acquisition unit 301, configured to acquire the battery temperature of the power battery in the fuel cell vehicle in real time based on the first temperature sensor.

[0110] A target temperature range determination unit 302, configured to determine the target temperature range in which the battery temperature is located in a preset battery temperature range. The preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy.

[0111] A battery thermal management unit 303, configured to perform thermal management on the power battery by controlling the cooling module or the heating module based on the thermal management strategy corresponding to the target temperature range.

[0112] Regarding the above power battery thermal management device 300 for a vehicle, the specific functions of each unit have been described in detail in the embodiments of the power battery thermal management method provided in this specification, and will not be elaborated here.

[0113] Based on the same inventive concept, an embodiment of the specification of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of any of the methods of the foregoing power battery thermal management method are implemented.

[0114] The present invention has at least the following beneficial effects:

[0115] 1. By providing a heating subsystem including multiple heating modules and a cooling subsystem including multiple cooling modules in a fuel cell vehicle. When it is detected that the power battery is in different temperature ranges, different thermal management strategies are adopted to control each cooling / heating module to cool / heat the power battery respectively, thereby realizing the dynamic regulation of the temperature of the power battery and improving the thermal management efficiency.

[0116] 2. By differentiating between the small-circuit cooling mode and the large-circuit cooling mode of the cooling module in the auxiliary cooling circuit, the problem of the reduction in the heat dissipation capacity of the fuel cell vehicle when the compressor fails under extreme conditions (such as accelerating uphill at extremely low temperatures on the plateau) is avoided.

[0117] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0118] In addition, the functional modules in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0119] When the above-mentioned functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0120] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A thermal management method for an automotive power battery, characterized in that, A controller applied to the thermal management system of a power battery for a fuel cell vehicle. The thermal management system of the power battery for the fuel cell vehicle further includes a heating subsystem, a heat dissipation subsystem, and a temperature sensor. The heating subsystem includes a plurality of heating modules, the heat dissipation subsystem includes a plurality of heat dissipation modules, and the temperature sensor includes a first temperature sensor. Each of the heating modules, each of the heat dissipation modules, and the temperature sensor are respectively communicatively connected to the controller; the method includes: Based on the first temperature sensor, the battery temperature of the power battery in the fuel cell vehicle is collected in real time; Judge the target temperature range in which the battery temperature is located in a preset battery temperature range. The preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy; Based on the thermal management strategy corresponding to the target temperature range, control the heat dissipation module or the heating module to perform thermal management on the power battery.

2. The automotive power battery thermal management method according to claim 1, characterized in that, The preset battery temperature range includes a first temperature range. The heating module includes a heating, ventilation, and air conditioning (HVAC) unit and a positive temperature coefficient (PTC) heater. Based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery includes: If the target temperature range in which the battery temperature is located is the first temperature range, control the HVAC unit to turn on in a heating mode, and determine the pulse width modulation (PWM) duty cycle of the PTC heater; Based on the PWM duty cycle, control the PTC heater to heat.

3. The method for thermal management of an automotive power battery according to claim 2, characterized in that, The temperature sensor further includes a second temperature sensor. Determining the PWM duty cycle of the PTC heater includes: Based on the second temperature sensor, collect the first inlet water temperature of the PTC heater; Call a preset duty cycle mapping table, and based on the first inlet water temperature, determine the PWM duty cycle corresponding to the first inlet water temperature in the preset duty cycle mapping table.

4. The automotive power battery thermal management method according to claim 2, characterized in that The preset battery temperature range further includes a second temperature range, and the second temperature range is greater than the first temperature range. Based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes: If the target temperature range in which the battery temperature is located is the second temperature range, adjust the PWM duty cycle of the PTC heater to a preset PWM duty cycle, and maintain the operating state of the HVAC unit.

5. The automotive power battery thermal management method according to claim 4, characterized in that, The preset battery temperature range further includes a third temperature range, and the third temperature range is greater than the second temperature range. Based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes: If the target temperature range in which the battery temperature is located is the third temperature range, turn off the PTC heater and maintain the operating state of the HVAC unit.

6. The automotive power battery thermal management method according to claim 5, wherein The preset battery temperature range further includes a fourth temperature range, the fourth temperature range is greater than the third temperature range, the heat dissipation module includes a refrigerant cooling circuit heat dissipation module, and based on the thermal management strategy corresponding to the target temperature range, controlling the heat dissipation module or the heating module to perform thermal management on the power battery further includes: If the target temperature range where the battery temperature is located is the fourth temperature range, control the refrigerant cooling circuit heat dissipation module to start to dissipate heat from the power battery.

7. The automotive power battery thermal management method according to claim 6, wherein The temperature sensor further includes a third temperature sensor, the heat dissipation module further includes an auxiliary cooling circuit heat dissipation module, and the method further includes: If the target temperature range where the battery temperature is located is the fourth temperature range, collect the second inlet water temperature of the auxiliary cooling circuit heat dissipation module based on the third temperature sensor; Judge whether the second inlet water temperature is greater than or equal to a preset inlet water temperature threshold; If so, control the auxiliary cooling circuit heat dissipation module to start to dissipate heat from the power battery.

8. The automotive power battery thermal management method according to claim 7, characterized in that, The refrigerant cooling circuit heat dissipation module includes a compressor, the temperature sensor further includes a fourth temperature sensor, the auxiliary cooling circuit heat dissipation module includes a large circulation heat dissipation mode and a small circulation heat dissipation mode, and the method further includes: Obtain the ambient temperature based on the fourth temperature sensor, and obtain the compressor speed of the compressor; If the compressor speed is not 0 and the ambient temperature is greater than or equal to a preset ambient temperature threshold, control the auxiliary cooling circuit heat dissipation module to operate in the small circulation heat dissipation mode; If the ambient temperature is less than the preset ambient temperature threshold and the compressor speed is 0, control the auxiliary cooling circuit heat dissipation module to operate in the large circulation heat dissipation mode.

9. An automotive power battery thermal management device, characterized in that, A controller applied to a fuel cell vehicle power battery thermal management system, the fuel cell vehicle power battery thermal management system further includes a heating subsystem, a heat dissipation subsystem and a temperature sensor, the heating subsystem includes a plurality of heating modules, the heat dissipation subsystem includes a plurality of heat dissipation modules, the temperature sensor includes a first temperature sensor, and each of the heating modules, each of the heat dissipation modules and the temperature sensor is communicatively connected to the controller; The vehicle power battery thermal management device includes: A battery temperature acquisition unit, configured to collect the battery temperature of the power battery in the fuel cell vehicle in real time based on the first temperature sensor; A target temperature range determination unit, configured to determine the target temperature range in which the battery temperature is located in a preset battery temperature range, the preset battery temperature range includes a plurality of temperature ranges, and each temperature range corresponds to a thermal management control strategy; A battery thermal management unit, configured to control the heat dissipation module or the heating module to perform thermal management on the power battery based on the thermal management strategy corresponding to the target temperature range.

10. An electronic device, characterized in that, Including: A memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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