A battery thermal management control system

Abstract

The application provides a battery thermal management control system, which collects current battery temperature and current battery heating power of a power battery pack, calculates expected direct cooling heat dissipation power based on the current battery temperature and expected battery temperature, and adjusts the rotating speed of a compressor according to the current battery heating power and the expected direct cooling heat dissipation power, so that the current battery temperature of the power battery pack after temperature adjustment is the same as the expected battery temperature, and the current battery heating power after temperature adjustment is the same as the expected direct cooling heat dissipation power. That is, in the application, the direct cooling temperature adjustment operation is performed on the power battery pack, and after the current battery temperature of the power battery pack is the same as the expected battery temperature, the current battery heating power is the same as the expected direct cooling heat dissipation power, so that the temperature of the power battery pack after temperature adjustment is maintained in a stable state, and the precise control of the battery temperature is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery thermal management, and more particularly, to a battery thermal management control system. BACKGROUND

[0002] Thermal management of power battery is a key prerequisite to ensure safe and efficient operation of electric vehicles. Excessive battery temperature may cause liquid leakage, spontaneous combustion and other phenomena, and low battery temperature will lead to a certain degree of attenuation of battery charge and discharge performance.

[0003] Therefore, when performing thermal management of power battery, the thermal management control method of power battery needs to accurately control the battery temperature, so that the battery temperature is stabilized in a suitable temperature range, and the safe and efficient operation of electric vehicles is ensured. Therefore, when performing thermal management of power battery, how to accurately control the battery temperature is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the present application provides a battery thermal management control system to solve the problem of the need for accurate control of battery temperature when performing thermal management of power battery.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] A battery thermal management control system, comprising:

[0007] a controller and a direct cooling device;

[0008] The direct cooling device comprises a direct cooling component and a compressor;

[0009] The power battery pack is installed on the direct cooling component, and the output end of the direct cooling component is connected to the input end of the compressor;

[0010] The controller is in communication connection with the compressor and is used to collect the current battery temperature and the current battery heat generation power of the power battery pack;

[0011] The controller comprises a cascade PID controller;

[0012] The cascade PID controller comprises an outer loop PID controller and an inner loop PID controller;

[0013] The outer loop PID controller is used to calculate the expected direct cooling heat dissipation power based on the current battery temperature and the expected battery temperature;

[0014] The inner loop PID controller is used to adjust the rotating speed of the compressor according to the current battery heat generation power and the expected direct cooling heat dissipation power;

[0015] The current battery temperature of the power battery pack after temperature regulation is the same as the expected battery temperature, and the current battery heat generation power after temperature regulation is the same as the expected direct-cooling heat dissipation power.

[0016] In some embodiments, the outer loop PID controller is specifically configured to obtain the expected battery temperature, calculate a heat generation difference between a current battery heat generation corresponding to the current battery temperature and an expected battery heat generation corresponding to the expected battery temperature, and calculate an expected direct-cooling heat dissipation power corresponding to the heat generation difference.

[0017] In some embodiments, the outer loop PID controller is specifically configured to:

[0018] obtain a calculation formula of the expected direct-cooling heat dissipation power, the calculation formula being:

[0019] wherein u1(t) is the expected direct-cooling heat dissipation power at the current time t, e Q (t) is the heat generation difference at the current time t; K p1 , K i1 , and K d1 are a proportional coefficient, an integral coefficient, and a differential coefficient of an outer loop PID controller in the controller, respectively;

[0020] The expected direct-cooling heat dissipation power corresponding to the heat generation difference is calculated based on the heat generation difference and the calculation formula of the expected direct-cooling heat dissipation power.

[0021] In some embodiments, the inner loop PID controller is specifically configured to calculate a power difference between the current battery heat generation power and the expected direct-cooling heat dissipation power, calculate a compressor rotating speed corresponding to the power difference, and adjust the rotating speed of the compressor according to the compressor rotating speed.

[0022] In some embodiments, the inner loop PID controller is specifically configured to:

[0023] obtain a calculation formula of the compressor rotating speed, the calculation formula being:

[0024] wherein u2(t) is the compressor rotating speed at the current time t, e P (t) is the power difference at the current time t; K p2 , K i2 , and K d2 are a proportional coefficient, an integral coefficient, and a differential coefficient of an inner loop PID controller in the controller, respectively;

[0025] The compressor rotating speed corresponding to the power difference is calculated based on the power difference and the calculation formula of the compressor rotating speed.

[0026] In some embodiments, the inner loop PID controller is configured to send the compressor speed to the compressor to adjust the speed of the compressor to the compressor speed.

[0027] In some embodiments, the outer loop PID controller and the inner loop PID controller are configured to match the battery heat and power control required for control.

[0028] In some embodiments, the direct cooling device further comprises:

[0029] a condensing component, a liquid storage tank, and a thermal expansion valve, an output end of the liquid storage tank is connected to the direct cooling component through the thermal expansion valve, an output end of the compressor is connected to an input end of the condensing component, and an output end of the condensing component is connected to an input end of the liquid storage tank.

[0030] In some embodiments, the direct cooling component comprises a direct cooling plate, and the condensing component comprises a condenser.

[0031] In some embodiments, the power battery pack is mounted on the direct cooling plate, when the direct cooling device is working, refrigerant flows out of the liquid storage tank, the thermal expansion valve is used to throttle and cool the refrigerant flowing to the direct cooling plate, low-temperature refrigerant flows through the direct cooling plate to cool the power battery pack mounted thereon, the compressor is used to compress and heat the refrigerant flowing from the direct cooling plate, the condenser is used for heat exchange between the refrigerant and air, and the cooled refrigerant flows back to the liquid storage tank to complete the refrigeration cycle.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] The application provides a battery thermal management control system, which comprises a controller and a direct cooling device, the direct cooling device comprises a direct cooling component and a compressor, a power battery pack is installed on the direct cooling component, and an output end of the direct cooling component is connected with an input end of the compressor. The controller is in communication connection with the compressor and is used for collecting a current battery temperature and a current battery heating power of the power battery pack, calculating an expected direct cooling heat dissipation power based on the current battery temperature and an expected battery temperature, and adjusting a rotating speed of the compressor according to the current battery heating power and the expected direct cooling heat dissipation power, so that the current battery temperature after temperature adjustment of the power battery pack is the same as the expected battery temperature, and the current battery heating power after temperature adjustment is the same as the expected direct cooling heat dissipation power. That is to say, in the application, the power battery pack is subjected to direct cooling temperature adjustment operation, and after the current battery temperature of the power battery pack is the same as the expected battery temperature, the current battery heating power is the same as the expected direct cooling heat dissipation power, so that the temperature of the power battery pack after temperature adjustment is maintained in a stable state, and precise control of the battery temperature is realized. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.

[0035] Figure 1 A structural schematic diagram of a battery thermal management control system provided by the embodiment of the present application;

[0036] Figure 2 A working flowchart of a cascade PID controller provided by the embodiment of the present application;

[0037] Figure 3 A structural schematic diagram of another battery thermal management control system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0039] Power battery thermal management is a key prerequisite to ensure the safe and efficient operation of electric vehicles. If the battery temperature is too high, it may cause liquid leakage, spontaneous combustion and other phenomena. If the battery temperature is too low, the battery charging and discharging performance will be subject to a certain degree of decay.

[0040] Therefore, when the power battery thermal management is performed, the power battery thermal management control method needs to accurately control the battery temperature so that the battery temperature is stabilized in a suitable temperature range to ensure the safe and efficient operation of the electric vehicle. Therefore, when the power battery thermal management is performed, how to accurately control the battery temperature is a technical problem to be solved by those skilled in the art.

[0041] When the battery temperature is accurately controlled, the battery temperature can be judged and controlled: when the battery temperature exceeds the set threshold, the battery is cooled.

[0042] However, this control method stops the cooling device after cooling is not needed, and the battery temperature will rise with continuous heating. Therefore, the cooling device needs to be started continuously, thereby causing regulation lag, boundary oscillation, inaccurate control and high energy consumption.

[0043] Therefore, the present application provides a battery thermal management control system, which comprises a controller and a direct cooling device. The direct cooling device comprises a direct cooling component and a compressor, and the power battery pack is installed on the direct cooling component. The output end of the direct cooling component is connected to the input end of the compressor. The controller is in communication connection with the compressor and is used to collect the current battery temperature and the current battery heating power of the power battery pack. Based on the current battery temperature and the expected battery temperature, the expected direct cooling heat dissipation power is calculated. According to the current battery heating power and the expected direct cooling heat dissipation power, the speed of the compressor is adjusted so that the current battery temperature after temperature adjustment is the same as the expected battery temperature, and the current battery heating power after temperature adjustment is the same as the expected direct cooling heat dissipation power. That is, in the present application, the power battery pack is subjected to direct cooling temperature adjustment operation. After the current battery temperature of the power battery pack is the same as the expected battery temperature, the current battery heating power is the same as the expected direct cooling heat dissipation power, so that the temperature of the power battery pack after temperature adjustment is maintained in a stable state, the accurate control of the battery temperature is realized, and the energy consumption is reduced.

[0044] On the basis of the above, an embodiment of the present application provides a battery thermal management control system, which refers to Figure 1 may include:

[0045] The controller and the direct cooling device. The direct cooling device comprises a direct cooling component and a compressor;

[0046] A power battery pack is installed on the direct cooling component, and an output end of the direct cooling component is connected with an input end of the compressor.

[0047] The controller is in communication connection with the compressor and is used to collect a current battery temperature and a current battery heat generation power of the power battery pack.

[0048] In detail, the design purpose of the battery thermal management control system is to keep the battery temperature in a desired interval and to reduce energy consumption as much as possible on this basis. The implementation process of regulating the battery temperature is to set the heat generation power of the battery thermal management control system according to the temperature difference between the current battery temperature and the desired battery temperature, so that the battery reaches and remains at the desired battery temperature.

[0049] Therefore, the direction of work of the battery thermal management control system includes two aspects: one is to make the battery reach the desired battery temperature, and the other is to maintain the balance between the battery heat generation and the external heat exchange in the steady state. Therefore, the energy-saving design is performed from the above two directions: one is to fully utilize the battery heat generation and the external heat exchange to make the battery reach the desired battery temperature and reduce the self-work, and the other is to accurately match the power of the battery heat generation and the external heat exchange in the steady state of the system to reduce the fluctuation loss.

[0050] The control target of the battery thermal management control system includes:

[0051] (1) the battery reaches the desired battery temperature or the desired heat;

[0052] (2) the power of the battery heat generation and the external heat exchange is matched, wherein the external heat exchange power is the direct cooling heat dissipation power of the direct cooling plate.

[0053] Therefore, the controller in the battery thermal management control system is implemented by using a cascade PID controller, and a structure diagram thereof is shown in Figure 2 The cascade PID controller includes an outer loop PID controller and an inner loop PID controller.

[0054] The outer loop PID controller is used to calculate a desired direct cooling heat dissipation power based on the current battery temperature and the desired battery temperature.

[0055] The inner loop PID controller is used to adjust the rotating speed of the compressor according to the current battery heat generation power and the desired direct cooling heat dissipation power.

[0056] The current battery temperature of the power battery pack after temperature regulation is the same as the desired battery temperature, and the current battery heat generation power after temperature regulation is the same as the desired direct cooling heat dissipation power.

[0057] Specifically, the structures of the outer loop PID controller and the inner loop PID controller are matched with the battery heat and power control required by control, the heat generating power of the inner loop is matched while the expected heat of the outer loop is reached, and accurate model information is not required, so the energy-saving control algorithm is designed in this way. Compared with the traditional single-stage PID control, the cascade control can effectively improve the system response speed, suppress noise interference and improve the dynamic quality of the system.

[0058] The cascade PID controller accurately controls the battery heat and then controls the battery temperature through the mutual coordination of the double loops. The input of the outer loop PID controller is the current battery temperature and the expected battery temperature, and the output is the expected direct cooling heat dissipation power. The input of the inner loop PID controller is the current battery heat generating power and the expected direct cooling heat dissipation power, and the output is the compressor speed, that is, the compressor speed is controlled through the output of the inner loop PID controller, and then the battery is cooled.

[0059] In this embodiment, the battery thermal management control system includes a controller and a direct cooling device, the direct cooling device includes a direct cooling component and a compressor, and a power battery pack is installed on the direct cooling component. The output end of the direct cooling component is connected with the input end of the compressor. The controller is in communication connection with the compressor and is used to collect the current battery temperature and the current battery heat generating power of the power battery pack, calculate the expected direct cooling heat dissipation power based on the current battery temperature and the expected battery temperature, and adjust the speed of the compressor according to the current battery heat generating power and the expected direct cooling heat dissipation power, so that the current battery temperature of the power battery pack after temperature adjustment is the same as the expected battery temperature, and the current battery heat generating power after temperature adjustment is the same as the expected direct cooling heat dissipation power. That is, in this embodiment, the direct cooling temperature adjustment operation is performed on the power battery pack, the current battery heat generating power is the same as the expected direct cooling heat dissipation power after the current battery temperature of the power battery pack is the same as the expected battery temperature, the temperature of the power battery pack after temperature adjustment is maintained in a stable state, the accurate control of the battery temperature is realized, and the energy consumption is reduced.

[0060] Further, one optional implementation of the outer loop PID controller for calculating the expected direct cooling heat dissipation power based on the current battery temperature and the expected battery temperature in the above embodiment is as follows:

[0061] The outer loop PID controller is specifically used to obtain the expected battery temperature, calculate the heat generation difference between the current battery heat generation corresponding to the current battery temperature and the expected battery heat generation corresponding to the expected battery temperature, and calculate the expected direct cooling heat dissipation power corresponding to the heat generation difference.

[0062] The expected battery temperature T tar is a pre-set ideal battery temperature. The expected battery temperature Ttar may be pre-stored in a storage device of the controller or obtained from an external device. The current battery temperature T bat The corresponding current battery heat generation Q bat The calculation formula is as follows:

[0063] Q bat = c bat m bat T bat

[0064] Wherein, c bat is the specific heat capacity of the power battery, m bat is the total mass of the power battery.

[0065] The desired battery temperature T tar The corresponding desired battery heat generation Q tar The calculation formula is as follows:

[0066] Q tar = c bat m bat T tar

[0067] Wherein, c bat is the specific heat capacity of the power battery, m bat is the total mass of the power battery.

[0068] The heat generation difference e Q = Q tar - Q bat .

[0069] The desired direct cooling heat dissipation power corresponding to the heat generation difference is calculated, specifically: obtaining the calculation formula of the desired direct cooling heat dissipation power, the calculation formula is:

[0070]

[0071] Wherein, u1(t) is the desired direct cooling heat dissipation power at the current time t, e Q (t) is the heat generation difference at the current time t; K p1 , K i1 , K d1 are the proportional coefficient, integral coefficient and differential coefficient of the outer loop PID controller in the controller respectively.

[0072] According to the calculation formula of the heat generation difference and the desired direct cooling heat dissipation power, the desired direct cooling heat dissipation power corresponding to the heat generation difference is calculated.

[0073] In practical application, refer to Figure 2The outer loop PID controller is configured with a formula for calculating the desired direct cooling heat dissipation power, and the heat difference e is used. Q The input is fed into the outer loop PID controller, which can then calculate the heat difference e based on the formula for calculating the expected direct cooling heat release power. Q The corresponding expected direct cooling heat release power u1.

[0074] Furthermore, in the above embodiments, an optional implementation method for the inner-loop PID controller to adjust the compressor speed based on the current battery heating power and the desired direct cooling heat release power is as follows:

[0075] The inner-loop PID controller is specifically used to calculate the power difference between the current battery heating power and the expected direct cooling heat release power, calculate the compressor speed corresponding to the power difference, and adjust the compressor speed according to the compressor speed.

[0076] The current battery heat dissipation power is represented by P. bat Indicates the current battery heat dissipation power P. bat The power difference e between the expected direct cooling heat release power u1 and the power e P =u1-P bat .

[0077] One possible implementation for calculating the compressor speed corresponding to the power difference is as follows:

[0078] The formula for calculating the compressor speed is as follows:

[0079] Where u2(t) is the compressor speed at the current time t, e p (t) represents the power difference at the current time t; K p2 K i2 K d2 These are the proportional coefficient, integral coefficient, and derivative coefficient of the inner-loop PID controller in the controller, respectively.

[0080] Based on the power difference and the compressor speed calculation formula, the compressor speed corresponding to the power difference is calculated.

[0081] Reference Figure 2 The formula for calculating the compressor speed can be configured within the inner loop PID controller, taking the power difference e as an example. P The input is fed into the inner-loop PID controller, which can then calculate the power difference e based on the compressor speed calculation formula. P The corresponding compressor speed u2.

[0082] It should be noted that K in the outer loop PID controller p1 Ki1 K d1 K p2 K i2 K d2 Need to be pre-configured to meet the desired battery heat and match the heat power.

[0083] In this embodiment, the outer ring PID controller adjusts the current battery heat to the desired battery heat, and then adjusts the current battery temperature to the desired battery temperature, achieving the effect of precise temperature control; the inner ring PID controller matches the output of the outer ring PID controller, that is, the desired direct cooling heat dissipation power and the current battery heat power, achieving the balance of battery heat and external heat exchange power while meeting the desired battery heat.

[0084] In the cascade PID controller, the outer ring and the inner ring have 3 parameters to be tuned K p1 K i1 K d1 K p2 K i2 K d2 , and the parameters affect each other, and the inner and outer ring parameters need to be coordinated with each other to achieve good control effect.

[0085] The physical quantity regulated by the cascade PID controller is the compressor speed, which is sent to the compressor to adjust the speed to the compressor speed for refrigeration cycle to achieve the cooling effect.

[0086] In this embodiment, the battery is cooled when the battery temperature is high, and the temperature can be precisely adjusted and controlled. The cascade PID controller is used to adjust the battery heat and the battery heat power, which matches the inner ring heat power while achieving the outer ring target heat, and the precise and rapid adjustment of the battery temperature can be realized without accurate model information.

[0087] In addition, the direct cooling device further comprises:

[0088] The condensing component, the liquid storage tank, and the thermal expansion valve; the output end of the liquid storage tank is connected with the direct cooling component through the thermal expansion valve, the output end of the compressor is connected with the input end of the condensing component, and the output end of the condensing component is connected with the input end of the liquid storage tank.

[0089] In actual application, the direct cooling component comprises a direct cooling plate, and the condensing component comprises a condenser.

[0090] Specifically, the battery is cooled by the direct cooling method when the battery temperature is high, and the temperature can be precisely adjusted and controlled.

[0091] like Figure 3 As shown, the direct cooling system mainly includes: a compressor, a condensing component (such as a condenser), a liquid receiver, a thermostatic expansion valve, a direct cooling component (such as a direct cooling plate), and a battery pack, with the power battery pack mounted on the direct cooling plate. When the direct cooling system is working, refrigerant flows out from the liquid receiver. The thermostatic expansion valve throttles and cools the refrigerant flowing towards the direct cooling plate. The low-temperature refrigerant flows through the direct cooling plate to cool the power battery pack mounted on it. The compressor compresses and heats the refrigerant flowing from the direct cooling plate. The condenser facilitates convective heat exchange between the refrigerant and air. The cooled refrigerant flows back to the liquid receiver, completing the refrigeration cycle.

[0092] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0093] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery thermal management control system, characterized by, The application relates to a power battery temperature regulation system. The system comprises a controller and a direct cooling device. The direct cooling device comprises a direct cooling component and a compressor. A power battery pack is mounted on the direct cooling component, and an output end of the direct cooling component is connected with an input end of the compressor. The controller is in communication connection with the compressor and is used for collecting a current battery temperature and a current battery heat generation power of the power battery pack. The controller comprises a cascade PID controller. The cascade PID controller comprises an outer loop PID controller and an inner loop PID controller. The outer loop PID controller is used for calculating a desired direct cooling heat dissipation power based on the current battery temperature and a desired battery temperature. The inner loop PID controller is used for adjusting a rotating speed of the compressor according to the current battery heat generation power and the desired direct cooling heat dissipation power. The current battery temperature of the power battery pack after temperature regulation is the same as the desired battery temperature, and the current battery heat generation power after temperature regulation is the same as the desired direct cooling heat dissipation power. The outer loop PID controller is specifically used for obtaining the desired battery temperature, calculating a heat generation difference value between a current battery heat generation amount corresponding to the current battery temperature and a desired battery heat generation amount corresponding to the desired battery temperature, and obtaining a calculation formula of the desired direct cooling heat dissipation power. The calculation formula is as follows: wherein, is the expected direct-cooling heat release power at the current time t, is the heat generation difference value at the current time t; are respectively the proportional coefficient, the integral coefficient and the differential coefficient of the outer loop PID controller in the controller; The desired direct cooling heat dissipation power corresponding to the heat generation difference value is calculated according to the heat generation difference value and the calculation formula of the desired direct cooling heat dissipation power.

2. The battery thermal management control system of claim 1, wherein, The inner loop PID controller is specifically used for calculating a power difference value between the current battery heat generation power and the desired direct cooling heat dissipation power, calculating a compressor rotating speed corresponding to the power difference value, and adjusting the rotating speed of the compressor according to the compressor rotating speed.

3. The battery thermal management control system of claim 2, wherein, The inner loop PID controller is specifically used for: obtaining a calculation formula of the compressor rotating speed, and calculating the compressor rotating speed corresponding to the power difference value based on the power difference value and the calculation formula of the compressor rotating speed. wherein, is the compressor speed at the current time t, is the power difference at the current time t; are respectively the proportional coefficient, the integral coefficient and the differential coefficient of the inner loop PID controller in the controller. The inner loop PID controller is specifically used for sending the compressor rotating speed to the compressor, so that the compressor adjusts the rotating speed to the compressor rotating speed.

4. The battery thermal management control system of claim 2, wherein, The structures of the outer loop PID controller and the inner loop PID controller are matched with battery heat and power control required by control.

5. The battery thermal management control system of claim 1, wherein, The direct cooling device further comprises a condensing component, a liquid storage tank and a thermal expansion valve.

6. The battery thermal management control system of claim 1, wherein, An output end of the liquid storage tank is connected with the direct cooling component through the thermal expansion valve, an output end of the compressor is connected with an input end of the condensing component, and an output end of the condensing component is connected with an input end of the liquid storage tank. The direct cooling component comprises a direct cooling plate, and the condensing component comprises a condenser.

7. The battery thermal management control system of claim 6, wherein, ​ 8. The battery thermal management control system of claim 7, wherein, The power battery pack is installed on the direct cooling plate. When the direct cooling device works, refrigerant flows out from the liquid storage tank. The thermal expansion valve is used for throttling and cooling the refrigerant flowing to the direct cooling plate. The low-temperature refrigerant flows through the direct cooling plate to cool the power battery pack installed thereon. The compressor is used for compressing and warming the refrigerant flowing from the direct cooling plate. The condenser is used for heat exchange between the refrigerant and air. The cooled refrigerant flows back to the liquid storage tank to complete the refrigeration cycle.

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