New energy vehicle type battery cooling hierarchical control method and device, terminal and storage medium

Abstract

The invention belongs to the technical field of automobiles, and particularly relates to a new energy vehicle type battery cooling hierarchical control method and device, a terminal and a storage medium. Step 1, determining the highest temperature grade of the battery; 2, judging the power level of the battery; 3, judging the cooling grade of the battery according to the highest temperature grade and the power grade of the battery; and 4, controlling the target water temperature of the battery cooling water inlet according to the battery cooling grade. Aiming at a liquid-cooled battery cooling system, by analyzing the charging and discharging state, the electric power state and the highest temperature of a battery cell, the working intensity of the battery cooling system is judged, battery cooling is subjected to hierarchical management according to requirements, different cooling grade requirements correspond to different cooling medium temperatures, the temperature of the battery cell of the power battery is reasonably controlled, and the battery cooling efficiency is improved. The comfort of the air conditioning system in the vehicle is ensured, the working energy consumption of the system is reduced, and the service life of the power battery is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and specifically relates to a method, device, terminal and storage medium for hierarchical control of battery cooling of a new energy vehicle. Background Art

[0002] As we all know, the power batteries of new energy vehicles will release a lot of heat during the discharge and charging process. The accumulation of heat will increase the temperature of the power battery cells. The ideal operating temperature of the power battery is 20℃-50℃. Excessive temperature of the cell will greatly affect the battery life and effective discharge capacity. In order to control the temperature of the power battery cell within the ideal temperature range and ensure the normal output of the vehicle power, vehicle designers use different design schemes to achieve battery cooling for power batteries of different capacities. For example, most small-capacity power batteries are air-cooled, that is, the natural wind is introduced into the battery for cooling during the driving process of the vehicle; while large-capacity power batteries are generally cooled by liquid cooling or direct cooling due to their large size and large heat dissipation, that is, a cooling plate is added to the power battery pack to exchange heat with the battery cell. In recent years, due to the continuous increase in users' demand for the range of new energy vehicles, large-capacity power batteries have been used more and more, and air-cooled small-capacity power batteries are rarely used.

[0003] For large-capacity power batteries that adopt liquid cooling or direct cooling design, the cooling capacity comes from the vehicle air conditioning system. When designing the system, the refrigerant is passed to the battery cooler through parallel pipes, and the heat of the power battery is exchanged out through the low-temperature phase change heat of the refrigerant. The liquid-cooled battery cooling system consists of an air conditioning controller, a vehicle controller, a water pump, an intermediate heat exchanger, an electronic expansion valve, an electric compressor, pipelines and a battery cooling plate; the direct-cooled battery cooling system consists of an air conditioning controller, a vehicle controller, an electronic expansion valve, pipelines and a battery cooling plate.

[0004] As a direct heat exchange component of large-capacity power batteries, the battery cooling plate, according to the heat exchange theory of heat exchangers, the greater the temperature difference and the greater the flow rate between the two heat exchange media, the higher the heat exchange capacity and the more obvious the battery cooling effect. In the actual operation of the battery cooling system, since the total cooling capacity of the air-conditioning system is certain, excessive temperature difference means that more cooling capacity is taken away by the battery cooling system. Although the battery cooling effect is good, it will cause the air outlet temperature of the air-conditioning system in the car to rise rapidly, affecting the comfort in the car, and accompanied by a significant increase in the energy consumption of the entire system. In addition, through basic research on lithium batteries, it is found that if the temperature of the battery cooling plate is too low, it will cause uneven temperature distribution of the battery cell, causing "lithium precipitation" inside the battery cell, resulting in a reduction in the service life of the power battery. Therefore, it is particularly important to balance the comfort in the car, system energy consumption and battery cooling effect. Summary of the invention

[0005] The present invention proposes a method, device, terminal and storage medium for hierarchical control of battery cooling of new energy vehicle models. For a liquid-cooled battery cooling system, the working intensity of the battery cooling system is determined by analyzing the charging and discharging state, electric power state and maximum temperature of the battery cell. The battery cooling is managed in a hierarchical manner according to demand. Different cooling level requirements correspond to different cooling medium temperatures, and the temperature of the power battery cell is reasonably controlled, which not only ensures the comfort of the in-vehicle air-conditioning system, reduces the system's operating energy consumption, but also increases the service life of the power battery.

[0006] The technical solution of the present invention is described as follows in conjunction with the accompanying drawings:

[0007] In a first aspect, an embodiment of the present invention provides a new energy vehicle battery cooling hierarchical control method, comprising:

[0008] Step 1: Determine the maximum temperature level of the battery;

[0009] Step 2: Determine the battery power level;

[0010] Step 3: Determine the battery cooling level according to the battery maximum temperature level and the battery power level;

[0011] Step 4: Control the target water temperature of the battery cooling water according to the battery cooling level.

[0012] Furthermore, the specific method of step one is as follows:

[0013] a1) When charging, the maximum battery temperature is ≤T1, and the battery temperature level is 0; when the maximum battery temperature is between T2 and T3, the battery temperature level is 1; when the maximum battery temperature is between T4 and T5, the battery temperature level is 2; when the maximum battery temperature is ≥T6, the battery temperature level is 3;

[0014] b1) When not charging, the maximum battery temperature is ≤ T7, and the battery temperature level is 0; when the maximum battery temperature is between T8 and T9, the battery temperature level is 1; when the maximum battery temperature is between T 10 -T 11 When the battery temperature is ≥T6, the battery temperature level is 3;

[0015] Furthermore, the specific method of step 2 is as follows:

[0016] a2) When charging, the charging power is ≤ p1, and the battery power level is 0; when the charging power is between P2 and P3, the battery power level is 1; when the charging power is between P4 and P5, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3;

[0017] b2) When not charging, the charging power is ≤ p1 and the battery power level is 0; when the charging power is between P2-P7, the battery power level is 1; when the charging power is between P8-P9, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3.

[0018] Furthermore, the specific method of step three is as follows:

[0019] When the battery maximum temperature level is 0 and the battery power level is 0, the battery cooling level is 0;

[0020] When the battery maximum temperature level is 0 and the battery power level is 1, the battery cooling level is 0;

[0021] When the battery maximum temperature level is 0 and the battery power level is 2, the battery cooling level is 0;

[0022] When the battery maximum temperature level is 0 and the battery power level is 3, the battery cooling level is 0;

[0023] When the battery maximum temperature level is 1 and the battery power level is 0, the battery cooling level is 0;

[0024] When the battery maximum temperature level is 1 and the battery power level is 1, the battery cooling level is 1;

[0025] When the battery maximum temperature level is 1 and the battery power level is 2, the battery cooling level is 1;

[0026] When the battery maximum temperature level is 1 and the battery power level is 3, the battery cooling level is 1;

[0027] When the battery maximum temperature level is 2 and the battery power level is 0, the battery cooling level is 1;

[0028] When the battery maximum temperature level is 2 and the battery power level is 1, the battery cooling level is 2;

[0029] When the maximum battery temperature level is 2 and the battery power level is 2, the battery cooling level is 2;

[0030] When the maximum battery temperature level is 2 and the battery power level is 3, the battery cooling level is 2;

[0031] When the maximum battery temperature level is 3 and the battery power level is 0, the battery cooling level is 3;

[0032] When the maximum battery temperature level is 3 and the battery power level is 1, the battery cooling level is 3;

[0033] When the maximum battery temperature level is 3 and the battery power level is 2, the battery cooling level is 3;

[0034] When the maximum battery temperature level is 3 and the battery power level is 3, the battery cooling level is 3.

[0035] 5. A new energy vehicle battery cooling hierarchical control method according to claim 4, characterized in that the specific method of step 4 is as follows:

[0036] When the battery cooling level is 0, the battery cooling system does not work;

[0037] When the battery cooling level is 1, the target water temperature of the battery cooling plate is T 12 ;

[0038] When the battery cooling level is 2, the target water temperature of the battery cooling plate is T 13 ;

[0039] When the battery cooling level is 3, the battery cooling system has no target water temperature and enters full-power working state.

[0040] In a second aspect, an embodiment of the present invention further provides a battery cooling hierarchical control device for a new energy vehicle, comprising:

[0041] A first determination module, used to determine the maximum temperature level of the battery;

[0042] A second determination module, used for determining a battery power level;

[0043] A third determination module, used for determining the battery cooling level according to the battery maximum temperature level and the battery power level;

[0044] The control module is used to control the target water temperature of the battery cooling water according to the battery cooling level.

[0045] In a third aspect, a terminal is provided, including:

[0046] one or more processors;

[0047] a memory for storing the one or more processor-executable instructions;

[0048] Wherein, the one or more processors are configured to:

[0049] Execute the method described in the first aspect of the embodiment of the present invention.

[0050] In a fourth aspect, a non-temporary computer-readable storage medium is provided. When the instructions in the storage medium are executed by a processor of a terminal, the terminal is enabled to execute the method described in the first aspect of an embodiment of the present invention.

[0051] In a fifth aspect, an application product is provided. When the application product is running on a terminal, the terminal executes the method described in the first aspect of the embodiment of the present invention.

[0052] The beneficial effects of the present invention are:

[0053] 1) The present invention determines the working intensity of the battery cooling system by analyzing the battery's charge and discharge state, electric power state, and maximum cell temperature, and manages the battery cooling in a graded manner according to demand. Different cooling level requirements correspond to different cooling medium temperatures, and the power battery cell temperature is reasonably controlled;

[0054] 2) The present invention not only ensures the comfort of the in-vehicle air-conditioning system, reduces the system's operating energy consumption, but also increases the service life of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 This is a flow chart of a hierarchical control method for battery cooling of a new energy vehicle model according to the present invention;

[0057] Figure 2 This is a schematic diagram of the structure of a battery cooling hierarchical control device for a new energy vehicle model according to the present invention;

[0058] Figure 3 The present invention is a schematic block diagram of a terminal structure. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0061] Embodiment 1

[0062] This embodiment provides a new energy vehicle battery cooling hierarchical control method, which can be executed by a new energy vehicle battery cooling hierarchical control device in an embodiment of the present invention, which can be implemented in software and / or hardware, as follows:

[0063] See also Figure 1 , a new energy vehicle battery cooling hierarchical control method, comprising the following steps:

[0064] Step 1: Determine the maximum temperature level of the battery, as follows:

[0065] a1) When charging, the maximum battery temperature is ≤T1, and the battery temperature level is 0; when the maximum battery temperature is between T2 and T3, the battery temperature level is 1; when the maximum battery temperature is between T4 and T5, the battery temperature level is 2; when the maximum battery temperature is ≥T6, the battery temperature level is 3;

[0066] b1) When not charging, the maximum battery temperature is ≤ T7, and the battery temperature level is 0; when the maximum battery temperature is between T8 and T9, the battery temperature level is 1; when the maximum battery temperature is between T 10 -T 11 When the battery temperature is ≥T6, the battery temperature level is 3;

[0067] The judgment threshold can be optimized and adjusted according to the system conditions.

[0068] Step 2: Determine the battery power level, as follows:

[0069] a2) When charging, the charging power is ≤ p1, and the battery power level is 0; when the charging power is between P2 and P3, the battery power level is 1; when the charging power is between P4 and P5, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3;

[0070] b2) When not charging, the charging power is ≤ p1 and the battery power level is 0; when the charging power is between P2-P7, the battery power level is 1; when the charging power is between P8-P9, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3.

[0071] Step 3: Determine the battery cooling level according to the battery maximum temperature level and battery power level, as shown in the following table:

[0072]

[0073] Step 4: Control the target water temperature of the battery cooling water according to the battery cooling level, as follows:

[0074] When the battery cooling level is 0, the battery cooling system does not work;

[0075] When the battery cooling level is 1, the target water temperature of the battery cooling plate is T12;

[0076] When the battery cooling level is 2, the target water temperature of the battery cooling plate is T13;

[0077] When the battery cooling level is 3, the battery cooling system has no target water temperature and enters full-power working state.

[0078] In summary, the battery cooling requirement level is determined according to the battery power level and the maximum temperature level of the battery, and the cooling capacity distribution of the system is reasonably controlled to avoid affecting the comfort of the vehicle's air-conditioning system and reduce the energy consumption of the vehicle.

[0079] Embodiment 2

[0080] See also Figure 2 This embodiment provides a new energy vehicle battery cooling hierarchical control device, including:

[0081] A first determination module, used to determine the maximum temperature level of the battery;

[0082] A second determination module, used for determining a battery power level;

[0083] A third determination module, used for determining the battery cooling level according to the battery maximum temperature level and the battery power level;

[0084] The control module is used to control the target water temperature of the battery cooling water according to the battery cooling level.

[0085] Embodiment 3

[0086] Figure 3 1 is a block diagram of a terminal provided in an embodiment of the present application, and the terminal may be a terminal in the above embodiment. The terminal may be a portable mobile terminal, such as a smart phone or a tablet computer. The terminal may also be referred to as a user device, a portable terminal, or other names.

[0087] Typically, the terminal includes: a processor 301 and a memory 302 .

[0088] The processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 301 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 301 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 301 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0089] The memory 302 may include one or more computer-readable storage media, which may be tangible and non-transitory. The memory 302 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 302 is used to store at least one instruction, which is used to be executed by the processor 301 to implement a new energy vehicle battery cooling hierarchical control method provided in this application.

[0090] In some embodiments, the terminal may further include: a peripheral device interface 303 and at least one peripheral device. Specifically, the peripheral device includes: at least one of a radio frequency circuit 304 , a touch display screen 305 , a camera 306 , an audio circuit 307 , a positioning component 308 and a power supply 309 .

[0091] The peripheral device interface 303 may be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 301 and the memory 302. In some embodiments, the processor 301, the memory 302, and the peripheral device interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302, and the peripheral device interface 303 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.

[0092] The radio frequency circuit 304 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 304 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 304 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the radio frequency circuit 304 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, and the like. The radio frequency circuit 304 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: the World Wide Web, a metropolitan area network, an intranet, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 304 may also include circuits related to NFC (Near Field Communication), which is not limited in this application.

[0093] The touch display screen 305 is used to display the UI (User Interface). The UI may include graphics, text, icons, videos and any combination thereof. The touch display screen 305 also has the ability to collect touch signals on the surface or above the surface of the touch display screen 305. The touch signal can be input to the processor 301 as a control signal for processing. The touch display screen 305 is used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the touch display screen 305 can be one, and the front panel of the terminal is set; in other embodiments, the touch display screen 305 can be at least two, which are respectively set on different surfaces of the terminal or are folded; in some other embodiments, the touch display screen 305 can be a flexible display screen, which is set on the curved surface or folded surface of the terminal. Even, the touch display screen 305 can also be set to a non-rectangular irregular shape, that is, a special-shaped screen. The touch display screen 305 can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode, organic light-emitting diode).

[0094] The camera assembly 306 is used to capture images or videos. Optionally, the camera assembly 306 includes a front camera and a rear camera. Typically, the front camera is used to realize video calls or selfies, and the rear camera is used to realize the shooting of photos or videos. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth of field camera, and a wide-angle camera, so as to realize the fusion of the main camera and the depth of field camera to realize the background blur function, and the fusion of the main camera and the wide-angle camera to realize panoramic shooting and VR (Virtual Reality) shooting functions. In some embodiments, the camera assembly 306 may also include a flash. The flash can be a monochrome temperature flash or a dual-color temperature flash. A dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation at different color temperatures.

[0095] The audio circuit 307 is used to provide an audio interface between the user and the terminal. The audio circuit 307 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, and convert the sound waves into electrical signals and input them into the processor 301 for processing, or input them into the radio frequency circuit 304 to achieve voice communication. For the purpose of stereo acquisition or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal. The microphone may also be an array microphone or an omnidirectional acquisition microphone. The speaker is used to convert the electrical signal from the processor 301 or the radio frequency circuit 304 into sound waves. The speaker may be a traditional film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for purposes such as ranging. In some embodiments, the audio circuit 307 may also include a headphone jack.

[0096] The positioning component 308 is used to locate the current geographical location of the terminal to implement navigation or LBS (Location Based Service). The positioning component 308 can be a positioning component based on the US GPS (Global Positioning System) or China's Beidou system.

[0097] The power supply 309 is used to power various components in the terminal. The power supply 309 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 309 includes a rechargeable battery, the rechargeable battery can be a wired rechargeable battery or a wireless rechargeable battery. A wired rechargeable battery is a battery charged through a wired line, and a wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0098] Those skilled in the art will understand that Figure 3The structure shown in the figure does not constitute a limitation on the terminal, and may include more or less components than those shown in the figure, or combine certain components, or adopt a different component arrangement.

[0099] Embodiment 4

[0100] In an exemplary embodiment, a computer-readable storage medium is also provided, on which a computer program is stored. When the program is executed by a processor, a new energy vehicle battery cooling hierarchical control method as provided in all the inventive embodiments of the present application is implemented.

[0101] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0102] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0103] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0104] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0105] Embodiment 5

[0106] In an exemplary embodiment, an application product is also provided, including one or more instructions, which can be executed by the processor 301 of the above-mentioned device to complete the above-mentioned new energy vehicle battery cooling hierarchical control method.

[0107] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and implementation mode. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A new energy vehicle battery cooling hierarchical control method, characterized in that: The following steps are involved: Step 1: Determine the maximum temperature level of the battery; Step 2: Determine the battery power level; Step 3: Determine the battery cooling level according to the battery maximum temperature level and the battery power level; Step 4: Control the target water temperature of the battery cooling water according to the battery cooling level.

2. A new energy vehicle battery cooling hierarchical control method according to claim 1, characterized in that: The specific method of step one is as follows: a1) When charging, the maximum battery temperature is ≤T1, and the battery temperature level is 0; when the maximum battery temperature is between T2 and T3, the battery temperature level is 1; when the maximum battery temperature is between T4 and T5, the battery temperature level is 2; when the maximum battery temperature is ≥T6, the battery temperature level is 3; b1) When not charging, the maximum battery temperature is ≤ T7, and the battery temperature level is 0; when the maximum battery temperature is between T8 and T9, the battery temperature level is 1; when the maximum battery temperature is between T 10 -T 11 When the maximum battery temperature is ≥ T6, the battery temperature level is 3.

3. A new energy vehicle battery cooling hierarchical control method according to claim 2, characterized in that: The specific method of step 2 is as follows: a2) When charging, the charging power is ≤ p1, and the battery power level is 0; when the charging power is between P2 and P3, the battery power level is 1; when the charging power is between P4 and P5, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3; b2) When not charging, the charging power is ≤ p1 and the battery power level is 0; when the charging power is between P2-P7, the battery power level is 1; when the charging power is between P8-P9, the battery power level is 2; when the charging power is ≥ P6, the battery power level is 3.

4. A new energy vehicle battery cooling hierarchical control method according to claim 3, characterized in that: The specific method of step three is as follows: When the battery maximum temperature level is 0 and the battery power level is 0, the battery cooling level is 0; When the battery maximum temperature level is 0 and the battery power level is 1, the battery cooling level is 0; When the battery maximum temperature level is 0 and the battery power level is 2, the battery cooling level is 0; When the battery maximum temperature level is 0 and the battery power level is 3, the battery cooling level is 0; When the battery maximum temperature level is 1 and the battery power level is 0, the battery cooling level is 0; When the battery maximum temperature level is 1 and the battery power level is 1, the battery cooling level is 1; When the battery maximum temperature level is 1 and the battery power level is 2, the battery cooling level is 1; When the battery maximum temperature level is 1 and the battery power level is 3, the battery cooling level is 1; When the battery maximum temperature level is 2 and the battery power level is 0, the battery cooling level is 1; When the battery maximum temperature level is 2 and the battery power level is 1, the battery cooling level is 2; When the maximum battery temperature level is 2 and the battery power level is 2, the battery cooling level is 2; When the maximum battery temperature level is 2 and the battery power level is 3, the battery cooling level is 2; When the maximum battery temperature level is 3 and the battery power level is 0, the battery cooling level is 3; When the maximum battery temperature level is 3 and the battery power level is 1, the battery cooling level is 3; When the maximum battery temperature level is 3 and the battery power level is 2, the battery cooling level is 3; When the maximum battery temperature level is 3 and the battery power level is 3, the battery cooling level is 3.

5. A new energy vehicle battery cooling hierarchical control method according to claim 4, characterized in that: The specific method of step 4 is as follows: When the battery cooling level is 0, the battery cooling system does not work; When the battery cooling level is 1, the target water temperature of the battery cooling plate is T 12 ; When the battery cooling level is 2, the target water temperature of the battery cooling plate is T 13 ; When the battery cooling level is 3, the battery cooling system has no target water temperature and enters full-power working state.

6. A battery cooling hierarchical control device for a new energy vehicle, characterized in that: include: A first determination module, used to determine the maximum temperature level of the battery; A second determination module, used for determining a battery power level; A third determination module, used to determine the battery cooling level according to the battery maximum temperature level and the battery power level; The control module is used to control the target water temperature of the battery cooling water according to the battery cooling level.

7. A terminal, characterized in that: include: one or more processors; a memory for storing the one or more processor-executable instructions; Wherein, the one or more processors are configured to: Execute a new energy vehicle battery cooling hierarchical control method as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by the processor of the terminal, the terminal is enabled to execute a new energy vehicle battery cooling hierarchical control method as described in any one of claims 1 to 5.

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