Thermal management control methods and systems for fast charging scenarios of new energy vehicle batteries

Abstract

This invention discloses a thermal management control method and system for fast charging scenarios of new energy vehicle batteries, belonging to the field of automotive thermal management technology. The method involves collecting current ambient temperature, current battery temperature, and remaining battery charge through a battery management module, processing this data using fuzzy control algorithms and the center-of-gravity method to determine the thermal management control activation coefficient. The vehicle controller obtains this coefficient, determines the battery thermal management operating mode based on it, and generates control commands. The battery thermal management device then receives the control commands and establishes either a battery air-cooling circuit or a battery refrigerant direct-cooling circuit. This system can determine the most suitable battery thermal management operating mode based on real-time ambient and battery temperature data, achieving battery cooling and energy savings. It addresses the problems of high safety risks and reduced charging efficiency caused by excessively high battery temperatures in existing systems.

Description

Technical Field

[0001] This invention relates to the field of automotive thermal management technology, and in particular to a thermal management control method and system for fast charging scenarios of new energy vehicle batteries. Background Technology

[0002] The statements in this section merely refer to the background art related to this invention and do not necessarily constitute prior art.

[0003] Currently, with the rapid development of the new energy vehicle industry, new energy vehicles are gradually gaining favor among consumers due to their high cost-effectiveness and other performance characteristics. Compared with traditional fuel vehicles, the power battery, as the main power source of new energy vehicles, is of paramount importance.

[0004] The thermal management system of a power battery directly affects its lifespan, vehicle performance, and safety. Especially during long-distance driving, when high-power fast charging is required, the battery's internal resistance generates significant Joule heat during rapid charging, causing a rapid temperature rise. Excessive battery temperature affects charging efficiency. Furthermore, the dense packing of cells within the battery pack makes heat dissipation in the central areas more difficult, exacerbating temperature inconsistencies between cells. The accumulation of heat over time in this relatively confined space not only reduces charging and discharging efficiency and power output, but without effective thermal management, the battery temperature may exceed safe operating limits, impacting battery performance and lifespan, and potentially leading to thermal runaway and safety accidents.

[0005] The battery thermal management system adjusts the battery temperature. Whether it is cooling or heating, it requires the consumption of the battery's own stored electrical energy, which leads to excessively long charging time. Users expect to shorten the fast charging time while ensuring battery safety. How to shorten the charging time and ensure charging safety has become a hot topic for various car companies in the research and development of new energy vehicles. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a thermal management control method and system for fast charging scenarios of new energy vehicle batteries, which improves battery safety and durability, shortens charging time, extends battery life, and thus improves the energy utilization efficiency of electric vehicles.

[0007] In a first aspect, the present invention provides a thermal management and control system for fast charging scenarios of new energy vehicle batteries;

[0008] A thermal management control system for fast charging scenarios of new energy vehicle batteries includes:

[0009] The battery management module is used to collect the current ambient temperature, current battery temperature, and remaining battery power, and process them using fuzzy control algorithms and the center of gravity method. It uses the membership function value of the battery energy distribution coefficient to determine the thermal management control activation coefficient.

[0010] The vehicle controller is used to obtain the thermal management control activation coefficient, determine the battery thermal management operation mode based on the thermal management control activation coefficient, and generate control commands.

[0011] A battery thermal management device is used to acquire control commands and form a battery air-cooling circuit or a battery refrigerant direct-cooling circuit according to the control commands. The battery air-cooling circuit removes excess heat and absorbs natural air from the environment through a cooler, heat exchanger and evaporator. The battery refrigerant direct-cooling circuit cools down the battery through a cooler, heat exchanger, water-cooled condenser and compressor, and dries the battery using a desiccant bottle.

[0012] In some implementations, the current ambient temperature, current battery temperature, and remaining battery charge are processed using fuzzy control algorithms and the center-of-gravity method. The thermal management control activation coefficient is determined using the membership function value of the battery energy distribution coefficient, including:

[0013] The current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature are input into the fuzzy controller for processing. The set fuzzy control rules are used to construct the relationship between the input and output, and obtain the membership function of the corresponding battery energy distribution coefficient.

[0014] Calculate the thermal management control activation coefficient based on the membership function values ​​of the battery energy distribution coefficient under all fuzzy control rules.

[0015] In some implementations, determining the battery thermal management operation mode based on the thermal management control activation coefficient specifically means: if the thermal management control activation coefficient is greater than or equal to a preset first threshold and less than a preset second threshold, then the battery thermal management operation mode is air-cooled mode; if the thermal management control activation coefficient is greater than or equal to a preset second threshold and less than a preset third threshold, then the battery thermal management operation mode is refrigerant direct cooling mode.

[0016] In some embodiments, the battery thermal management device includes a cooler, a heat exchanger, an evaporator, a water-cooled condenser, a compressor, a thermostat, and a desiccant.

[0017] The cooler is connected to the heat exchanger, the heat exchanger is connected to the evaporator and the water-cooled condenser respectively, and the evaporator is connected to the cooler; the output end of the water-cooled condenser is connected to a compressor, a temperature controller and a drying bottle in sequence, and the drying bottle is connected to the cooler.

[0018] In some embodiments, a first cooling solenoid valve and a first electronic expansion valve are provided between the cooler and the heat exchanger, and a second electronic expansion valve is provided between the cooler and the evaporator and the drying bottle.

[0019] In some embodiments, a pump is provided between the battery casing and the input end of the cooler, and a second cooling solenoid valve is provided between the output end of the cooler and the battery casing.

[0020] In some implementations, the thermal management control activation coefficient is expressed as:

[0021] ;

[0022] In the formula, Indicates the first One output quantity, Indicates the first The membership function value of the output quantity under a fuzzy control rule.

[0023] Secondly, the present invention provides a thermal management control method for fast charging scenarios of new energy vehicle batteries;

[0024] A thermal management control method for fast charging scenarios of new energy vehicle batteries, based on the aforementioned thermal management control system for fast charging scenarios of new energy vehicle batteries, includes:

[0025] The battery management module collects the current ambient temperature, current battery temperature, and remaining battery power, and processes them using fuzzy control algorithms and the center of gravity method. It then uses the membership function value of the battery energy distribution coefficient to determine the thermal management control activation coefficient and transmits it to the vehicle controller.

[0026] The vehicle controller receives the thermal management control activation coefficient, determines the battery thermal management operation mode based on the thermal management control activation coefficient, generates control commands, and sends them to the battery thermal management device.

[0027] The battery thermal management device receives control commands and forms either a battery air-cooling circuit or a battery refrigerant direct-cooling circuit according to the control commands.

[0028] In some implementations, the current ambient temperature, current battery temperature, and remaining battery charge are processed using fuzzy control algorithms and the center-of-gravity method. The thermal management control activation coefficient is determined using the membership function value of the battery energy distribution coefficient, including:

[0029] The current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature are input into the fuzzy controller for processing. The set fuzzy control rules are used to construct the relationship between the input and output, and obtain the membership function of the corresponding battery energy distribution coefficient.

[0030] Calculate the thermal management control activation coefficient based on the membership function values ​​of the battery energy distribution coefficient under all fuzzy control rules.

[0031] In some implementations, determining the battery thermal management operation mode based on the thermal management control activation coefficient specifically means: if the thermal management control activation coefficient is greater than or equal to a preset first threshold and less than a preset second threshold, then the battery thermal management operation mode is air-cooled mode; if the thermal management control activation coefficient is greater than or equal to a preset second threshold and less than a preset third threshold, then the battery thermal management operation mode is refrigerant direct cooling mode.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. The technical solution provided by this invention can determine the most suitable battery thermal management operation mode based on real-time ambient temperature and battery temperature data during fast charging of new energy batteries, achieve seamless switching between different cooling methods, achieve battery cooling effect and power saving; it can shorten the battery fast charging time and save time costs for car owners during travel.

[0034] 2. The technical solution provided by this invention allows the battery thermal management device to accommodate two thermal management operation modes simply by cooperating with components such as a cooler, evaporator, and water-cooled condenser. Switching between the battery air-cooled circuit and the battery refrigerant direct-cooling circuit can be achieved by switching between the cooling solenoid valve and the electronic expansion valve. It has significant advantages in terms of layout space. Compared with the thermal management system of existing new energy vehicles, the water pipe circuit structure is simplified, highly integrated, and has a significant lightweight effect, obvious cost advantages, and is easy to assemble.

[0035] 3. The technical solution provided by this invention combines a battery air-cooling circuit and a battery refrigerant direct cooling circuit to construct a battery thermal management device. It controls the energy output of the battery to the battery thermal management device according to the current battery status and environmental status. The structure is simple and easy to implement, with low cost, convenient assembly, convenient use, and intuitive and simple operation. It has the characteristics of being scalable.

[0036] 4. The technical solution provided by this invention uses fuzzy control algorithm and center of gravity method to realize the switching and coordinated operation of two cooling methods. It comprehensively considers the battery SOC value, current ambient temperature, battery comfort temperature and current battery temperature to construct fuzzy rules, and realizes accurate solution of battery energy distribution coefficient and thermal management control activation coefficient. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1This is a schematic diagram of the execution flow of a thermal management control system for fast charging scenarios of new energy vehicle batteries, provided in an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the architecture of a battery thermal management device provided in an embodiment of the present invention;

[0040] Figure 3 A flowchart illustrating the fuzzy control algorithm provided in an embodiment of the present invention;

[0041] Figure 4 This is a flowchart illustrating a thermal management control method for fast charging scenarios of new energy vehicle batteries provided in an embodiment of the present invention.

[0042] In the diagram: 1. Battery casing; 2. Pump; 3. First cooling solenoid valve; 4. First electronic expansion valve; 5. Heat exchanger; 6. Cooler; 7. Second cooling solenoid valve; 8. Second electronic expansion valve; 9. Evaporator; 10. Water-cooled condenser; 11. Temperature sensor; 12. Dryer bottle; 13. Thermostat; 14. Compressor. Detailed Implementation

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] Example 1

[0047] The rapid heating of batteries during fast charging can accelerate their aging, reduce their lifespan, and even pose safety risks. Therefore, this invention provides a thermal management and control system for fast charging scenarios of new energy vehicle batteries, which improves battery safety and durability, shortens charging time, extends battery life, and thus improves the energy economy of electric vehicles.

[0048] Next, combined Figures 1-4 This embodiment provides a detailed description of a thermal management control system for fast charging scenarios of new energy vehicle batteries. The thermal management control system for fast charging scenarios of new energy vehicle batteries includes a battery management module, a vehicle controller, and a battery thermal management device. The battery management module communicates with the vehicle controller via a CAN bus, and the vehicle controller communicates with the battery thermal management device via a CAN bus. The battery management module collects the current ambient temperature, the current battery temperature, and the remaining battery charge, and processes this data using a fuzzy control algorithm and the center of gravity method to determine the thermal management control activation coefficient. The vehicle controller acquires the thermal management control activation coefficient, determines the battery thermal management operating mode based on the coefficient, and generates control commands. The battery thermal management device acquires the control commands and forms either a battery air-cooling circuit or a battery refrigerant direct-cooling circuit based on the commands. The battery air-cooling circuit removes excess heat and absorbs ambient airflow via a cooler 6, a heat exchanger 5, and an evaporator 9. The battery refrigerant direct-cooling circuit cools the battery via a cooler 6, a heat exchanger 5, a water-cooled condenser 10, and a compressor 14, and dries the battery using a drying bottle 12.

[0049] Furthermore, the execution flow of the thermal management control system for fast charging scenarios of new energy vehicle batteries is as follows:

[0050] S1. The battery management module collects the current ambient temperature, current battery temperature, and remaining battery power, and processes them using fuzzy control algorithm and centroid method. It then uses the membership function value of the battery energy distribution coefficient to determine the thermal management control activation coefficient.

[0051] Here, the battery management module refers to the BMS system of new energy vehicle batteries.

[0052] As one implementation method, the current ambient temperature, current battery temperature, and remaining battery power are processed using fuzzy control algorithms and the center of gravity method to determine the thermal management control activation coefficient, including:

[0053] Step 1: Input the current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature into the fuzzy controller for processing. Use the set fuzzy control rules to build the relationship between the input and output, and obtain the membership function of the corresponding battery energy distribution coefficient.

[0054] Furthermore, firstly, the current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature are fuzzed.

[0055] Specifically, the battery SOC value S is fuzzified. When 0 ≤ S < 45%, it is a small positive value; when 45% ≤ S < 70%, it is a medium positive value; and when 70% ≤ S ≤ 100%, it is a large positive value. Let ps be the small positive value, pm be the medium positive value, and pb be the large positive value. Then the universe of discourse for the input variable S is

[01] , and the fuzzy subset is S = {ps, pm, pb}. Let the battery comfort temperature be T, and the difference between the current ambient temperature and the battery comfort temperature is... Blur the image. , 0≤ When <10, it is a positive minimum value; when 10 ≤ The median value is between 20 and 20. Values ​​≤35 are considered positive and large. Let ps be the smallest, pm the middle, and pb the largest. The universe of discourse for the input variables is ,right If the universe of discourse is normalized, then The universe of discourse for the input variables is fuzzy subset ; for the current battery temperature d t Fuzzification is performed based on the range of battery temperature changes during charging, where 0 ≤ d t When <10, it is a positive minimum value; when 10≤d, it is a positive minimum value. t The median value is between 25 and 25, and between 25 and d. t When ≤40 is considered a positive value, let ns be the smallest, nm the middle, and nb the largest. Then d t The universe of discourse for the input variables is Similarly, for d t If the universe of discourse is normalized, then d t The domain is fuzzy subset is The membership function of the output variable battery energy distribution coefficient K adopts a trigonometric function, the universe of discourse is [0 1], and the fuzzy subset is divided into {ps, pm, pb}.

[0056] Based on the above analysis, fuzzy control rules were formulated using the logical language form of "If…and…then…". For a multi-input, single-output fuzzy control system, 27 fuzzy control rules were established, as shown in Table 1-1, linking input and output factors. The rule expression form is as follows:

[0057]

[0058] Table 1-1 Fuzzy Control Rules

[0059]

[0060] Step 2: Calculate the thermal management control activation coefficient according to the implementation rules of the center of gravity method and transmit it to the vehicle controller. The thermal management control activation coefficient P is expressed as:

[0061] ;

[0062] In the formula, Output quantities under each fuzzy control rule Membership function value.

[0063] Fuzzy inference yields a fuzzy value, but the actual output required is an accurate value. Therefore, the fuzzy value needs to be clarified. The centroid method is actually a kind of imitation technique that can represent the intersection value of the centroid of the region formed by the membership function curve and the basic variable axis as an accurate value.

[0064] Step 2: The vehicle controller receives the thermal management control activation coefficient, determines the battery thermal management operation mode based on the thermal management control activation coefficient, and generates corresponding control commands to send to the battery thermal management device; the battery thermal management device performs cooling according to the control commands.

[0065] Specifically, if the thermal management control activation coefficient is greater than or equal to 0 and less than the preset first threshold, the battery thermal management device will not be activated for battery cooling; if the thermal management control activation coefficient is greater than or equal to the preset first threshold and less than the preset second threshold, the battery thermal management operation mode is air-cooled mode; if the thermal management control activation coefficient is greater than or equal to the preset second threshold and less than the preset third threshold, the battery thermal management operation mode is refrigerant direct cooling mode.

[0066] Furthermore, the battery thermal management device includes a cooler 6, a heat exchanger 5, an evaporator 9, and a water-cooled condenser 10, a compressor 14, a thermostat 13, and a dryer bottle 12 connected in sequence by pipes. The battery is installed in a battery casing 1, which is fitted over the battery and has a certain distance between it and the battery's outer surface. The output end of the battery casing 1 is connected to the input end of the cooler 6 through a pipe, and a pump 2 is installed on the pipe. The output end of the cooler 6 is connected to the input end of the battery casing 1, and a second cooling solenoid valve 7 is installed on the pipe. The input end of the cooler 6 is connected to the input end of the heat exchanger 5 through a pipe. A first cooling solenoid valve 3 and a first electronic expansion valve 4 are installed in sequence between the cooler 6 and the heat exchanger 5. The output end of the heat exchanger 5 is connected to the evaporator 9 and the water-cooled condenser 10 through pipes. The output end of the evaporator 9 is connected to the input end of the cooler 6, and the dryer bottle 12 is connected to the input end of the cooler 6. A second electronic expansion valve 8 is installed on the common pipe between the cooler 6, the evaporator 9, and the dryer bottle 12.

[0067] For example, when At this time, the battery thermal management device is not activated to cool the battery.

[0068] when When the battery thermal management device is activated, the air cooling system is turned on to cool the battery. Pump 2, cooler 6, second cooling solenoid valve 7, first cooling solenoid valve 3, first electronic expansion valve 4, heat exchanger 5 and evaporator 9 are started, while the remaining components are turned off. Starting from the battery casing 1, excess heat is carried away through the first cooling solenoid valve 3 and heat exchanger 5, and natural air from the environment is absorbed. The air cooling circuit is formed by passing through evaporator 9 to heat exchanger 5 and then to battery casing 1. This mode has the advantages of simple operation and low power consumption.

[0069] when When the battery thermal management device activates the refrigerant direct cooling mode to cool the battery, it starts pump 2, cooler 6, second cooling solenoid valve 7, first cooling solenoid valve 3, first electronic expansion valve 4, heat exchanger 5, water-cooled condenser 10, compressor 14, temperature controller 13, and dryer bottle 12, while the remaining components are in the off state. Excess heat is removed from the battery casing 1 via cooler 6 and heat exchanger 5, and the cooling effect is achieved through water-cooled condenser 10 and compressor 14. Temperature sensor 11 collects and controls the required temperature, and the low-temperature gas is dried via dryer bottle 12 to prevent excessive humidity from damaging the battery. The refrigerant direct cooling circuit is formed from cooler 6 to battery casing 1, which has the advantage of fast cooling effect.

[0070] Example 2

[0071] Combination Figure 4 Based on the thermal management control system for fast charging scenarios of new energy vehicle batteries described in Embodiment 1, this embodiment discloses a thermal management control method for fast charging scenarios of new energy vehicle batteries, including:

[0072] The battery management module collects the current ambient temperature, current battery temperature, and remaining battery power, and processes them using fuzzy control algorithms and the center of gravity method. It then uses the membership function value of the battery energy distribution coefficient to determine the thermal management control activation coefficient and transmits it to the vehicle controller.

[0073] The vehicle controller receives the thermal management control activation coefficient, determines the battery thermal management operation mode based on the thermal management control activation coefficient, generates control commands, and sends them to the battery thermal management device.

[0074] The battery thermal management device receives control commands and forms either a battery air-cooling circuit or a battery refrigerant direct-cooling circuit according to the control commands.

[0075] It should be noted that the above steps correspond to the execution steps of the thermal management control system for fast charging scenarios of new energy vehicle batteries described in Embodiment 1, and the specific details will not be repeated in this embodiment.

[0076] The descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermal management control system for fast charging scenarios of new energy vehicle batteries, characterized in that, include: The battery management module is used to collect the current ambient temperature, current battery temperature, and remaining battery power, and process them using fuzzy control algorithms and the center of gravity method. It uses the membership function value of the battery energy distribution coefficient to determine the thermal management control activation coefficient. The vehicle controller is used to obtain the thermal management control activation coefficient, determine the battery thermal management operation mode based on the thermal management control activation coefficient, and generate control commands. A battery thermal management device is used to acquire control commands and form a battery air-cooling circuit or a battery refrigerant direct-cooling circuit according to the control commands; wherein, the battery air-cooling circuit removes excess heat and absorbs natural wind from the environment through a cooler, heat exchanger and evaporator, and the battery refrigerant direct-cooling circuit cools down through a cooler, heat exchanger, water-cooled condenser and compressor, and dries the battery using a desiccant bottle. The current ambient temperature, current battery temperature, and remaining battery charge are processed using fuzzy control algorithms and the center-of-gravity method. The thermal management control activation coefficient is determined using the membership function value of the battery energy distribution coefficient, including: The current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature are input into the fuzzy controller for processing. The set fuzzy control rules are used to construct the relationship between the input and output, and obtain the membership function of the corresponding battery energy distribution coefficient. Calculate the thermal management control activation coefficient based on the membership function values ​​of the battery energy distribution coefficient under all fuzzy control rules; The determination of the battery thermal management operation mode based on the thermal management control activation coefficient is as follows: if the thermal management control activation coefficient is greater than or equal to a preset first threshold and less than a preset second threshold, the battery thermal management operation mode is air-cooled mode; if the thermal management control activation coefficient is greater than or equal to a preset second threshold and less than a preset third threshold, the battery thermal management operation mode is refrigerant direct cooling mode.

2. The thermal management control system for fast charging scenarios of new energy vehicle batteries as described in claim 1, characterized in that, The battery thermal management device includes a cooler, a heat exchanger, an evaporator, a water-cooled condenser, a compressor, a temperature controller, and a desiccant. The cooler is connected to the heat exchanger, the heat exchanger is connected to the evaporator and the water-cooled condenser respectively, and the evaporator is connected to the cooler; the output end of the water-cooled condenser is connected to a compressor, a temperature controller and a drying bottle in sequence, and the drying bottle is connected to the cooler.

3. The thermal management control system for fast charging scenarios of new energy vehicle batteries as described in claim 2, characterized in that, A first cooling solenoid valve and a first electronic expansion valve are provided between the cooler and the heat exchanger, and a second electronic expansion valve is provided between the cooler and the evaporator and the drying bottle.

4. The thermal management control system for fast charging scenarios of new energy vehicle batteries as described in claim 2, characterized in that, A pump is installed between the battery casing and the input end of the cooler, and a second cooling solenoid valve is installed between the output end of the cooler and the battery casing.

5. The thermal management control system for fast charging scenarios of new energy vehicle batteries as described in claim 1, characterized in that, The thermal management control activation coefficient is expressed as: ； In the formula, Indicates the output quantity. Indicates the first Output under a fuzzy control rule The membership function value.

6. A thermal management control method for fast charging scenarios of new energy vehicle batteries, based on the thermal management control system for fast charging scenarios of new energy vehicle batteries as described in any one of claims 1-5, characterized in that, include: The battery management module collects the current ambient temperature, current battery temperature, and remaining battery power, and processes them using fuzzy control algorithms and the center of gravity method to determine the thermal management control activation coefficient and transmit it to the vehicle controller. The vehicle controller receives the thermal management control activation coefficient, determines the battery thermal management operation mode based on the thermal management control activation coefficient, generates control commands, and sends them to the battery thermal management device. The battery thermal management device receives control commands and forms either a battery air-cooling circuit or a battery refrigerant direct-cooling circuit according to the control commands.

7. The thermal management control method for fast charging scenarios of new energy vehicle batteries as described in claim 6, characterized in that, By processing the current ambient temperature, current battery temperature, and remaining battery charge using fuzzy control algorithms and the center-of-gravity method, the thermal management control activation coefficient is determined, including: The current ambient temperature, current battery temperature, remaining battery power, and preset battery comfort temperature are input into the fuzzy controller for processing. The set fuzzy control rules are used to construct the relationship between the input and output, and obtain the membership function of the corresponding battery energy distribution coefficient. Calculate the thermal management control activation coefficient based on the membership function values ​​of the battery energy distribution coefficient under all fuzzy control rules.

8. The thermal management control method for fast charging scenarios of new energy vehicle batteries as described in claim 6, characterized in that, The determination of the battery thermal management operation mode based on the thermal management control activation coefficient is as follows: if the thermal management control activation coefficient is greater than or equal to a preset first threshold and less than a preset second threshold, the battery thermal management operation mode is air-cooled mode; if the thermal management control activation coefficient is greater than or equal to a preset second threshold and less than a preset third threshold, the battery thermal management operation mode is refrigerant direct cooling mode.

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