New energy vehicle thermal management system, method, computer device and storage medium

Abstract

The present application relates to a new energy vehicle thermal management system, method, computer equipment and storage medium. The thermal management system includes an electric drive circuit, which includes a radiator, a first pump, a motor and a waste heat source. The electric drive circuit also includes a branch and a three-way valve. One end of the branch is connected to the first output port of the three-way valve, and the other end is connected to the outlet end of the radiator; the input port of the three-way valve is connected to the first medium pipeline, and the second output port is connected to the inlet end of the radiator; it also includes a first temperature sensor for obtaining the temperature of the medium flowing through the motor; it also includes a controller, which is electrically connected to the three-way valve and the first temperature sensor respectively. The new energy vehicle thermal management system of the present application can improve the problem of poor motor thermal management effect in the existing technology.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a thermal management system, method, computer equipment, and storage medium for new energy vehicles. Background Art

[0002] At present, the thermal management of new energy vehicles mainly focuses on the impact of high and low temperatures on the efficiency of battery packs. The medium circuit used to transfer heat is also set around the battery pack. However, in reality, high and low temperatures will also have a huge impact on the electric drive system of new energy vehicles, especially leading to a reduction in motor efficiency.

[0003] The current thermal management system cannot provide good thermal management effect for electric drive systems, especially motors. Summary of the Invention

[0004] Based on this, a new energy vehicle thermal management system, method, computer equipment and storage medium are provided to improve the problem of poor motor thermal management effect in the prior art.

[0005] In one aspect, a new energy vehicle thermal management system is provided, comprising:

[0006] An electric drive circuit, the electric drive circuit comprising a radiator, a first pump, a motor, and a waste heat source, the radiator, the first pump, the motor, and the waste heat source being connected in series via a first medium pipeline, the electric drive circuit further comprising a branch and a three-way valve, one end of the branch being connected to a first output port of the three-way valve, and the other end being connected to an outlet of the radiator; an input port of the three-way valve being connected to the first medium pipeline, and a second output port being connected to an inlet of the radiator;

[0007] a first temperature sensor, disposed on the first medium pipeline, for obtaining the temperature of the medium flowing through the motor;

[0008] A controller is electrically connected to the three-way valve and the first temperature sensor respectively, and is used to obtain the sensing value of the first temperature sensor and determine the opening of the three-way valve according to the difference between the sensing value and the target value.

[0009] In one embodiment, it further includes:

[0010] A battery circuit includes a battery pack and a second pump connected in series via a second medium pipeline, the second medium pipeline is connected to the first medium pipeline via a four-way valve, and the four-way valve is electrically connected to the controller.

[0011] In one embodiment, an active air intake grille is further included, the radiator is arranged on the air outlet side of the active air intake grille, and the controller is further used to control the opening of the active air intake grille.

[0012] In one embodiment, the waste heat source includes at least an on-board charger or a DC converter.

[0013] On the other hand, a new energy vehicle thermal management method is provided, which is applied to the new energy vehicle thermal management system, comprising:

[0014] Obtaining the temperature of the medium flowing through the motor, and determining whether the medium temperature is consistent with the target temperature;

[0015] If not, the opening of the three-way valve is controlled according to the difference between the medium temperature and the target temperature, and the ratio of the medium flowing through the radiator and the branch is adjusted until the medium temperature reaches the target temperature.

[0016] In one embodiment, the opening of the three-way valve is controlled according to the following mathematical expression:

[0017] KD=kp*(T0-T act )+ki*e integral *T / T i

[0018] Wherein, KD is the opening of the first output port of the three-way valve, kp is the proportional gain coefficient, ki is the integral gain coefficient, T0 is the target temperature, T act is the medium temperature, e integral is the deviation integral, T is the sampling period, T i is the integration time.

[0019] In one embodiment, the method further comprises:

[0020] Get the battery circuit temperature and the battery pack cell temperature;

[0021] When the medium temperature is greater than the battery circuit temperature and the battery core temperature is less than a first temperature threshold, the connection direction of the four-way valve is adjusted to connect the first medium pipeline and the second medium pipeline in series.

[0022] In one embodiment, the method further comprises:

[0023] Get the ambient temperature;

[0024] When the ambient temperature is lower than a second temperature threshold, the active air intake grille is closed.

[0025] In another aspect, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the steps of the method are implemented when the processor executes the computer program.

[0026] A computer-readable storage medium is also provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method are implemented.

[0027] The above-mentioned new energy vehicle thermal management system, method, computer equipment and storage medium control the temperature of the electric drive circuit, especially the thermal management effect of the electric drive circuit, by adding a branch in the electric drive circuit and adjusting the three-way valve to control the proportion of the electric drive circuit medium that does not flow through the radiator under high and low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural block diagram of a thermal management system for a new energy vehicle in one embodiment;

[0029] Figure 2 This is a structural block diagram of a thermal management system for a new energy vehicle in another embodiment;

[0030] Figure 3 A schematic flow chart of a thermal management method for a new energy vehicle according to an embodiment;

[0031] Figure 4 A schematic flow chart of a thermal management method for a new energy vehicle in another embodiment;

[0032] Figure 5 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment.

[0033] Reference numerals: radiator 101 , first pump 102 , motor 103 , waste heat source 104 , branch 105 , three-way valve 106 , first temperature sensor 107 , second pump 108 , four-way valve 109 , active air intake grille 110 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0035] The thermal management system of new energy vehicles includes battery thermal management system, motor and electronic control management system, etc. In the existing technology, more attention is paid to the battery thermal management system, and there has been no major change in the thermal management of motor and electronic control. The traditional motor and electronic control thermal management method can no longer meet the high efficiency requirements of new energy vehicles for motor and electronic control systems in variable temperature environments, especially low temperature environments.

[0036] Taking low temperature environments as an example, the electric drive system, especially the motor, may suffer from reduced efficiency or even failure due to the following reasons:

[0037] 1. At low temperatures, bearing grease viscosity increases or even freezes, increasing the motor's mechanical friction torque and even producing a whistling sound. This also increases cogging torque. These two components comprise the motor's no-load static torque, which increases the motor's starting resistance torque at low temperatures, leading to higher starting voltage and current, and difficulty starting. Bearing friction also increases mechanical losses, affecting motor efficiency.

[0038] 2. The insulating glue will crack in a low temperature environment, which will greatly reduce the insulation performance of the motor, limit the motor output capacity, and shorten the motor service life.

[0039] 3. The ultimate strength and yield strength of motor structural parts will increase at low temperatures, but at the same time their impact toughness will decrease, that is, the material will become harder and more brittle, and will easily break when subjected to severe impact.

[0040] 4. The initial magnetic permeability of silicon steel sheets decreases at low temperatures, and the core loss increases, affecting the efficiency of the motor.

[0041] In high temperature environments, the electric drive system may also have abnormal performance, so it is particularly important to keep the electric drive system within a reasonable temperature range.

[0042] The thermal management system for new energy vehicles provided in this application focuses on improving the electric drive system to improve the thermal management effect of the electric drive system, especially the motor, in a variable temperature environment, especially a low temperature environment.

[0043] In one embodiment, Figure 1 As shown, a new energy vehicle thermal management system is provided, including: an electric drive circuit, a first sensor and a controller.

[0044] The electric drive circuit includes a radiator 101, a first pump 102, a motor 103 and a waste heat source 104, wherein the radiator 101 can be a low-temperature radiator 101 of the vehicle, located on the air outlet side of the active air intake grille 110, and further heat can be removed by a fan arranged between the active air intake grille 110 and the radiator 101.

[0045] The motor 103 is the driving motor of the vehicle, and the waste heat source 104 can be other heat-generating components of the vehicle, such as an on-board charger (OBC) of a new energy vehicle or a DC converter (such as a DC / DC converter) for voltage conversion, or Figure 1 As shown, multiple heat generating components are connected in series as the waste heat source 104 .

[0046] The radiator 101, the first pump 102, the motor 103 and the waste heat source 104 are connected in series through a first medium pipeline. The first medium pipeline is filled with a heat-conducting medium such as cooling water. Under the action of the first pump 102, the heat-conducting medium can circulate in the electric drive circuit and transfer heat.

[0047] The electric drive circuit also includes a branch 105 and a three-way valve 106, one end of the branch 105 is connected to the first output port of the three-way valve 106, and the other end is connected to the outlet end of the radiator 101; the input port of the three-way valve 106 is connected to the first medium pipeline, and the second output port is connected to the inlet end of the radiator 101, and the waste heat source 104 is connected to the input port of the three-way valve 106 through the first medium pipeline.

[0048] The first temperature sensor 107 is provided on the first medium pipeline for obtaining the temperature of the medium flowing through the motor 103 .

[0049] In one embodiment, the first temperature sensor 107 is set on the inlet side of the motor 103 to monitor the temperature of the heat-conducting medium entering the motor 103. In another embodiment, the first temperature sensor 107 can be set on the outlet side of the motor 103 to monitor the temperature of the heat-conducting medium flowing out of the motor 103.

[0050] The controller is electrically connected to the three-way valve 106 and the first temperature sensor 107 respectively. The controller is used to obtain the sensing value of the first temperature sensor 107 and determine the opening of the three-way valve 106 according to the difference between the sensing value and the target value.

[0051] The working principle of the new energy vehicle thermal management system provided by the above embodiment is described below using low temperature conditions.

[0052] The controller can obtain the current ambient temperature through the ambient temperature sensor. When the ambient temperature is lower than the set low temperature threshold, the controller enters the electric drive circuit insulation mode. It is worth mentioning that before this, the temperature of each component in the electric drive circuit can also be obtained to determine whether each component is overheated. If a component is overheated, this mode will not be entered.

[0053] In the electric drive circuit insulation mode, the controller can obtain the temperature of the heat-conducting medium flowing through the motor 103 according to the first temperature sensor 107, and determine whether there is a gap between the medium temperature and the target temperature. If so, the controller can control the opening of the three-way valve 106 to increase the proportion of the heat-conducting medium flowing through the branch 105 and reduce the proportion of the heat-conducting medium flowing through the radiator 101, so that the heat generated by the waste heat source 104 and the motor 103 itself is retained in the electric drive circuit until the temperature of the heat-conducting medium reaches the target temperature, so that the motor 103 is in a better temperature environment.

[0054] On the other hand, the flow of the heat-conducting medium can promote heat exchange between the waste heat source 104 and the motor 103, ultimately achieving temperature equilibrium so that all electric drive components located in the electric drive circuit can be in an optimal temperature range.

[0055] The above-mentioned new energy vehicle thermal management system can make less heat-conducting medium flow through the radiator 101 or even not flow through the radiator 101 under low temperature conditions, thereby reducing unnecessary heat loss of the heat-conducting medium at the radiator 101 and achieving insulation of the electric drive circuit.

[0056] In one embodiment, the controller is also connected to the active air intake grille 110 for controlling the opening of the active air intake grille 110. For example, when entering the electric drive circuit insulation mode, the active air intake grille 110 is controlled to be fully closed, thereby reducing air flow and enhancing the insulation effect.

[0057] In one embodiment, the provided new energy vehicle thermal management system also includes a battery circuit, which includes a battery pack and a second pump 108 connected in series through a second medium pipeline. The second medium pipeline is connected to the first medium pipeline through a four-way valve 109, and the four-way valve 109 is electrically connected to the controller.

[0058] like Figure 2 As shown, the conduction direction of the four-way valve 109 can be controlled by the controller. For example, when the temperature of the electric drive circuit is higher than that of the battery circuit and the battery circuit has a heat demand, the four-way valve 109 is controlled to connect the electric drive circuit and the battery circuit, and the heat of the electric drive circuit is used to heat the battery circuit.

[0059] In another embodiment, when the battery circuit and the electric drive circuit are connected, the heat sink 101 dissipates heat from the heat-conducting medium of the two circuits.

[0060] The controller in the aforementioned new energy vehicle thermal management system can be implemented in whole or in part through software, hardware, or a combination thereof. The controller can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device's memory in software form, allowing the processor to call and execute the corresponding operations described above.

[0061] In one embodiment, Figure 3 As shown, a new energy vehicle thermal management method is provided, which is applied to Figure 1 The thermal management system of a new energy vehicle in FIG is used as an example to illustrate the process, which includes the following steps:

[0062] Step 201 : obtaining the temperature of the medium flowing through the motor 103 and determining whether the medium temperature is consistent with the target temperature.

[0063] The target temperature may be a set value preset by a developer and stored in the controller, or a calculated value calculated based on vehicle conditions.

[0064] The medium temperature may be the temperature of the medium flowing into or out of the motor 103 . To a certain extent, the medium temperature may represent the temperature of the motor 103 itself.

[0065] Step 202, when there is a difference between the medium temperature and the target temperature, the opening of the three-way valve 106 is controlled according to the difference between the medium temperature and the target temperature, and the ratio of the medium flowing through the radiator 101 and the branch 105 is adjusted until the medium temperature reaches the target temperature.

[0066] For example, when the medium temperature is higher than the target temperature, the three-way valve 106 can be controlled to increase the opening of the second output port and reduce the opening of the first output port to increase the proportion of the heat-conducting medium entering the radiator 101, thereby achieving a better heat dissipation effect; when the medium temperature is lower than the target temperature, the second output port opening is reduced and the first output port opening is increased to increase the proportion of the heat-conducting medium entering the branch 105, thereby achieving more heat retention and improving the thermal insulation effect.

[0067] In one embodiment, the opening of the three-way valve 106 is controlled by a PI (proportional-integral) method.

[0068] For example, the opening of the first output port of the three-way valve 106 is PI controlled according to the following mathematical expression:

[0069] KD=kp*(T0-T act )+ki*e integral *T / T i

[0070] Wherein, KD is the opening degree of the first output port of the three-way valve 106, kp is the proportional gain coefficient, ki is the integral gain coefficient, T0 is the target temperature, T act is the medium temperature, e integral is the deviation integral, T is the sampling period, T i is the integration time.

[0071] Among them, the proportional gain coefficient and the integral gain coefficient can be calibrated according to actual measurement.

[0072] Through PI control, the temperature of the electric drive circuit can be controlled quickly and accurately.

[0073] In one embodiment, Figure 4 As shown, the method further includes the steps of utilizing excess heat from the electric drive circuit to adjust and control the temperature of the battery circuit, specifically including:

[0074] 1) Obtain the battery circuit temperature and the battery cell temperature of the battery pack;

[0075] 2) When the medium temperature is greater than the battery circuit temperature and the battery core temperature is less than a first temperature threshold, the connection direction of the four-way valve 109 is adjusted to connect the first medium pipeline and the second medium pipeline in series.

[0076] The battery cell temperature can be obtained by a second temperature sensor provided in the battery pack.

[0077] The first temperature threshold can be the battery's highest efficiency temperature point. When the medium temperature of the electric drive circuit is higher than the battery cell temperature, the excess waste heat in the electric drive circuit (such as the heat generated by the OBC during charging; the heat generated by the drive motor 103 when the vehicle is driving) is led to the battery circuit, thereby increasing the battery circuit temperature and improving the battery discharge efficiency.

[0078] In one embodiment, the thermal management system of a new energy vehicle can obtain the ambient temperature through an ambient temperature sensor. When the ambient temperature is less than a second temperature threshold, the active air intake grille 110 is closed to improve the thermal management effect.

[0079] In the above-mentioned thermal management method for new energy vehicles, by controlling the three-way valve 106, the heat transfer medium is allowed to flow around the radiator 101 under low temperature conditions, thereby reducing unnecessary heat loss and controlling the temperature of the electric drive circuit to be within a range suitable for the operation of the motor 103.

[0080] It should be understood that although Figure 3-4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 3-4 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0081] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 5As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a new energy vehicle thermal management method is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad provided on the computer device housing, or an external keyboard, touchpad or mouse.

[0082] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0083] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are performed:

[0084] Step A, obtaining the temperature of the medium flowing through the motor 103, and determining whether the medium temperature is consistent with the target temperature;

[0085] Step B: When the medium temperature is inconsistent with the target temperature, the opening of the three-way valve 106 is controlled according to the difference between the medium temperature and the target temperature, and the ratio of the medium flowing through the radiator 101 and the branch 105 is adjusted until the medium temperature reaches the target temperature.

[0086] The above-mentioned computer device adds a branch 105 in the electric drive circuit. Under high and low temperature conditions, the three-way valve 106 is adjusted to control the proportion of the electric drive circuit medium that does not flow through the radiator 101, thereby controlling the temperature of the electric drive circuit and improving the thermal management effect of the electric drive circuit, especially the motor 103.

[0087] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0088] The opening of the three-way valve 106 is controlled according to the following mathematical expression:

[0089] KD=kp*(T0-Tact )+ki*e integral *T / T i

[0090] Wherein, KD is the opening degree of the first output port of the three-way valve 106, kp is the proportional gain coefficient, ki is the integral gain coefficient, T0 is the target temperature, T act is the medium temperature, e integral is the deviation integral, T is the sampling period, T i is the integration time.

[0091] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0092] Get the battery circuit temperature and the battery pack cell temperature;

[0093] When the medium temperature is greater than the battery circuit temperature and the battery core temperature is less than a first temperature threshold, the connection direction of the four-way valve 109 is adjusted to connect the first medium pipeline and the second medium pipeline in series.

[0094] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0095] Get the ambient temperature;

[0096] When the ambient temperature is lower than a second temperature threshold, the active air intake grille 110 is closed.

[0097] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0098] Step A, obtaining the temperature of the medium flowing through the motor 103, and determining whether the medium temperature is consistent with the target temperature;

[0099] Step B: When the medium temperature is inconsistent with the target temperature, the opening of the three-way valve 106 is controlled according to the difference between the medium temperature and the target temperature, and the ratio of the medium flowing through the radiator 101 and the branch 105 is adjusted until the medium temperature reaches the target temperature.

[0100] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0101] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A thermal management system for new energy vehicles, characterized in that: include: An electric drive circuit, the electric drive circuit comprising a radiator, a first pump, a motor, and a waste heat source, the radiator, the first pump, the motor, and the waste heat source being connected in series via a first medium pipeline, the electric drive circuit further comprising a branch and a three-way valve, one end of the branch being connected to a first output port of the three-way valve, and the other end being connected to an outlet of the radiator; an input port of the three-way valve being connected to the first medium pipeline, and a second output port being connected to an inlet of the radiator; a first temperature sensor, disposed on the first medium pipeline, for obtaining the temperature of the medium flowing through the motor; A controller is electrically connected to the three-way valve and the first temperature sensor, and is used to obtain the sensing value of the first temperature sensor and determine the opening of the first output port of the three-way valve through a PI control method according to the difference between the medium temperature and the target temperature.

2. The new energy vehicle thermal management system according to claim 1, characterized in that: Also includes: A battery circuit includes a battery pack and a second pump connected in series via a second medium pipeline, the second medium pipeline is connected to the first medium pipeline via a four-way valve, and the four-way valve is electrically connected to the controller.

3. The new energy vehicle thermal management system according to claim 1, characterized in that: An active air intake grille is also included, and the radiator is arranged on the air outlet side of the active air intake grille. The controller is also used to control the opening of the active air intake grille.

4. The new energy vehicle thermal management system according to claim 1, characterized in that: The waste heat source includes at least an on-board charger or a DC converter.

5. A thermal management method for a new energy vehicle, applied to the thermal management system for a new energy vehicle according to any one of claims 1 to 4, characterized in that: include: Obtaining the temperature of the medium flowing through the motor, and determining whether the medium temperature is consistent with the target temperature; If not, the opening of the first output port of the three-way valve is controlled by PI control according to the difference between the medium temperature and the target temperature, and the ratio of the medium flowing through the radiator and the branch is adjusted until the medium temperature reaches the target temperature.

6. The thermal management method for new energy vehicles according to claim 5, characterized in that: The opening of the three-way valve is controlled according to the following mathematical expression: KD=kp*(T0-T act )+ki*e integral *T / T i Wherein, KD is the opening of the first output port of the three-way valve, kp is the proportional gain coefficient, ki is the integral gain coefficient, T0 is the target temperature, T act is the medium temperature, e integral is the deviation integral, T is the sampling period, T i is the integration time.

7. The thermal management method for new energy vehicles according to claim 5, characterized in that: The new energy vehicle thermal management system also includes: a battery circuit comprising a battery pack and a second pump connected in series via a second medium pipeline, the second medium pipeline being connected to the first medium pipeline via a four-way valve, and the four-way valve being electrically connected to the controller; The method further comprises: Get the battery circuit temperature and the battery pack cell temperature; When the medium temperature is greater than the battery circuit temperature and the battery core temperature is less than a first temperature threshold, the connection direction of the four-way valve is adjusted to connect the first medium pipeline and the second medium pipeline in series.

8. The thermal management method for new energy vehicles according to claim 5, characterized in that: The new energy vehicle thermal management system further includes an active air intake grille, the radiator is arranged on the air outlet side of the active air intake grille, and the controller is further used to control the opening of the active air intake grille; The method further comprises: Get the ambient temperature; When the ambient temperature is lower than a second temperature threshold, the active air intake grille is closed.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 8 are implemented.

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