Thermal management system control method, thermal management system, and vehicle

Abstract

The present invention discloses a control method for a thermal management system, comprising obtaining a battery pack temperature; determining whether the battery pack temperature reaches a preset temperature value; if so, controlling an air conditioning module to operate at an initial cooling capacity to cool the battery pack; recording the time at which the battery pack temperature reaches the preset temperature value as a first moment, obtaining the battery pack temperature at a second moment after the first moment, and calculating the temperature rise rate of the battery pack from the first moment to the second moment; determining whether the temperature rise rate is not less than 0°C / min; if so, increasing the cooling capacity of the air conditioning module and obtaining the battery pack temperature at a third moment after the second moment, where the difference between the third moment and the second moment is less than the difference between the second moment and the first moment; if not, reducing or maintaining the cooling capacity of the air conditioning module and obtaining the battery pack temperature at a fourth moment after the second moment, where the difference between the fourth moment and the second moment is not less than the difference between the second moment and the first moment. The control method for a thermal management system according to the present invention has the advantages of flexible sampling time, fast cooling response, and good cooling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a control method of a thermal management system, a thermal management system, and a vehicle. Background Art

[0002] The thermal management system in the related art usually cools the battery pack through an air-conditioning module, and continuously detects the temperature of the battery pack after a certain period of time, and adjusts the cooling capacity of the air-conditioning system according to the temperature of the battery pack. However, due to the unreasonable setting of the control method of the thermal management system in the related art, the response speed of the air-conditioning module in adjusting the cooling capacity is slow, which may cause the temperature of the battery pack to rise too high and the cooling effect is poor. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a control method for a thermal management system, which has the advantages of flexible sampling time, fast cooling response and good cooling effect.

[0004] According to the present invention, a thermal management system having the above-mentioned control method of the thermal management system is also proposed.

[0005] The present invention also provides a vehicle having the thermal management system.

[0006] To achieve the above-mentioned purpose, according to a first aspect of an embodiment of the present invention, a control method for a thermal management system is proposed, comprising: obtaining the temperature of a battery pack; determining whether the temperature of the battery pack reaches a preset temperature value; if so, controlling the air-conditioning module to operate with an initial cooling capacity and cool the battery pack; recording the time when the temperature of the battery pack reaches the preset temperature value as a first moment, obtaining the temperature of the battery pack at a second moment after the first moment, and calculating the temperature rise rate of the battery pack from the first moment to the second moment; determining whether the temperature rise rate of the battery pack from the first moment to the second moment is not less than 0°C / min; if so, increasing the cooling capacity of the air-conditioning module, and obtaining the temperature of the battery pack at a third moment after the second moment, wherein the difference between the third moment and the second moment is less than the difference between the second moment and the first moment; if not, reducing or maintaining the cooling capacity of the air-conditioning module, and obtaining the temperature of the battery pack at a fourth moment after the second moment, wherein the difference between the fourth moment and the second moment is not less than the difference between the second moment and the first moment.

[0007] The control method of the thermal management system according to the embodiment of the present invention has the advantages of flexible sampling time, fast cooling response and good cooling effect.

[0008] According to some embodiments of the present invention, controlling the air-conditioning module to operate with an initial cooling capacity includes: obtaining the temperature of the battery pack at the fifth moment before the first moment, calculating the temperature rise rate of the battery pack from the fifth moment to the first moment, and calculating the initial cooling capacity based on the temperature rise rate of the battery pack from the fifth moment to the first moment.

[0009] According to some embodiments of the present invention, calculating the initial cooling capacity based on the temperature rise rate of the battery pack from the fifth moment to the first moment includes: calculating the compressor speed, fan speed and expansion valve opening of the air-conditioning module based on the temperature rise rate of the battery pack from the fifth moment to the first moment; determining the initial cooling capacity based on the compressor speed, the fan speed and the expansion valve opening.

[0010] According to some embodiments of the present invention, if the temperature rise rate of the battery pack from the first moment to the second moment is not less than 0°C / min, it is determined whether the temperature rise rate of the battery pack from the first moment to the second moment is not less than a preset temperature rise rate; if so, the difference between the third moment and the second moment is not greater than half of the difference between the second moment and the first moment; if not, the difference between the third moment and the second moment is greater than half of the difference between the second moment and the first moment.

[0011] According to some embodiments of the present invention, if the temperature rise rate of the battery pack from the first moment to the second moment is less than 0°C / min, it is determined whether the temperature of the battery pack at the fourth moment is less than the preset temperature value; if so, the air-conditioning module is controlled to stop running.

[0012] According to some embodiments of the present invention, the preset temperature value is 35° C. to 40° C.; and the preset temperature rise rate is 1° C. / min to 3° C. / min.

[0013] According to a second aspect of the present invention, an embodiment provides a thermal management system, comprising: a battery pack; a battery pack water path, the battery pack being connected to the battery pack water path; a first heat exchanger, the first heat exchanger having a first heat exchange channel and a second heat exchange channel, the first heat exchange channel and the second heat exchange channel exchanging heat, the first heat exchange channel being connected to the battery pack water path; an air-conditioning module, the air-conditioning module being connected to the second heat exchange channel; a temperature sensor for detecting the temperature of the battery pack; a controller, the controller being connected to the temperature sensor and the air-conditioning module respectively, for obtaining the temperature value detected by the temperature sensor, calculating the temperature rise rate of the battery pack according to the temperature value, controlling the opening and closing of the air-conditioning module, and adjusting the cooling capacity of the air-conditioning module according to the temperature rise rate of the battery pack.

[0014] The thermal management system according to the second embodiment of the present invention has the advantages of flexible sampling time, fast cooling response and good cooling effect by utilizing the control method of the thermal management system according to the first embodiment of the present invention.

[0015] According to some embodiments of the present invention, the air-conditioning module includes: a compressor, a second heat exchanger and an expansion valve, the second heat exchanger is connected between the liquid outlet of the compressor and the expansion valve, the second heat exchange channel is connected between the expansion valve and the liquid inlet of the compressor, and the expansion valve is used to adjust the flow of the second heat exchange channel; a fan, the fan is adjacent to the second heat exchanger and is used to dissipate heat for the second heat exchanger; wherein the controller is respectively connected to the compressor, the expansion valve and the fan, and adjusts the speed of the compressor, the speed of the fan and the opening of the expansion valve according to the temperature rise rate of the battery pack.

[0016] According to some embodiments of the present invention, the air-conditioning module also includes: a third heat exchanger, which is connected in parallel with the first heat exchanger and is used to cool the passenger compartment of the vehicle; and a passenger compartment expansion valve, which is connected in series with the third heat exchanger and in parallel with the expansion valve and is used to regulate the flow of the third heat exchanger.

[0017] According to a third aspect of the present invention, a vehicle is provided, comprising the thermal management system according to the second aspect of the present invention.

[0018] The vehicle according to the third aspect of the present invention, by utilizing the thermal management system according to the second aspect of the present invention, has the advantages of flexible sampling time, fast cooling response and good cooling effect.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 is a flowchart of a control method of a thermal management system according to an embodiment of the present invention.

[0022] Figure 2 is another flow chart of a control method of a thermal management system according to an embodiment of the present invention.

[0023] Figure 3 is a schematic diagram of a thermal management system according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Thermal management system 1.

[0026] Battery pack water channel 100, battery pack 110,

[0027] The first heat exchanger 200, the first heat exchange channel 210, the second heat exchange channel 220,

[0028] Air conditioning module 300, compressor 310, second heat exchanger 320, expansion valve 330, fan 340, third heat exchanger 350, passenger compartment expansion valve 360,

[0029] Electric assembly water circuit 400, motor 410, motor radiator 420, motor fan 430. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0033] In the description of the present invention, “a plurality of” means two or more, and “a number of” means one or more.

[0034] The following describes a control method of a thermal management system according to an embodiment of the present invention with reference to the accompanying drawings.

[0035] like Figure 1-Figure 3 As shown, the control method of the thermal management system according to an embodiment of the present invention includes:

[0036] Obtaining the temperature of the battery pack 110;

[0037] Determining whether the temperature of the battery pack 110 reaches a preset temperature value;

[0038] If yes, the air conditioning module 300 is controlled to operate at the initial cooling capacity and cool the battery pack 110 ;

[0039] Recording the time when the temperature of the battery pack 110 reaches a preset temperature value as a first moment, obtaining the temperature of the battery pack 110 at a second moment after the first moment, and calculating the temperature rise rate of the battery pack 110 from the first moment to the second moment;

[0040] Determine whether the temperature rise rate of the battery pack 110 from the first moment to the second moment is not less than 0° C. / min;

[0041] If yes, increase the cooling capacity of the air conditioning module 300 and obtain the temperature of the battery pack 110 at a third moment after the second moment, wherein the difference between the third moment and the second moment is less than the difference between the second moment and the first moment;

[0042] If not, the cooling capacity of the air conditioning module 300 is reduced or maintained, and the temperature of the battery pack 110 at a fourth moment after the second moment is obtained, wherein the difference between the fourth moment and the second moment is not less than the difference between the second moment and the first moment.

[0043] According to the control method of the thermal management system of an embodiment of the present invention, by obtaining the temperature of the battery pack 110, it is determined whether the temperature of the battery pack 110 reaches a preset temperature value. If the temperature of the battery pack 110 reaches the preset temperature value, the air-conditioning module 300 is controlled to operate with the initial cooling capacity and cool the battery pack 110. In this way, when the temperature of the battery pack 110 reaches the preset temperature value, the air-conditioning module 300 can be started at the first time and the temperature of the battery pack 110 can be quickly reduced by cooling the air-conditioning module 300, thereby preventing the temperature of the battery pack 110 from continuing to rise significantly, and at the same time greatly improving the cooling rate of the battery pack 110. The cooling effect of the battery pack 110 is better, which avoids the temperature of the battery pack 110 from being too high, and thus the temperature of the battery pack 110 can be maintained at a suitable temperature, which is beneficial to improving the storage capacity of the battery pack 110 and extending the life of the battery pack 110.

[0044] In addition, the temperature rise rate of the battery pack 110 between the first moment and the second moment is calculated, that is, the difference between the temperature of the battery pack 110 at the second moment and the temperature of the battery pack 110 at the first moment is divided by the time interval between the first moment and the second moment. In this way, the temperature rise rate of the battery pack 110 can be used to determine the rate of temperature rise of the battery pack 110, or to determine whether the temperature of the battery pack 110 is rising or falling.

[0045] In addition, by judging whether the temperature rise rate between the first moment and the second moment is not less than 0°C / min, if so, the cooling capacity of the air-conditioning module 300 is increased, and the temperature of the battery pack 110 at the third moment after the second moment is obtained, wherein the difference between the third moment and the second moment is less than the difference between the second moment and the first moment.

[0046] That is to say, when it is detected that the temperature rise rate of the battery pack 110 between the first moment and the second moment is greater than or equal to 0°C / min, it means that the battery pack 110 is still heating up or not cooling down between the first moment and the second moment. At this time, the interval between the second moment and the third moment can be shortened, and the temperature of the battery pack 110 can be detected again in a shorter time, so that the cooling capacity of the air-conditioning module 300 can be adjusted again in a short time. Therefore, the thermal management system 1 can control the time detection of the battery pack 110 temperature according to the temperature rise rate of the battery pack 110, and can adjust the cooling capacity of the air-conditioning module 300 again in a short time. 10 When the temperature of the battery pack 110 continues to rise, the time interval for detecting the temperature of the battery pack 110 is shortened to realize frequent and multiple detections of the temperature of the battery pack 110, and then the cooling capacity of the air-conditioning module 300 can be adjusted frequently and multiple times. When the temperature of the battery pack 110 continues to rise, the cooling capacity of the air-conditioning module 300 can be frequently increased, which is beneficial to improving the cooling response rate of the air-conditioning module 300 to the battery pack 110, so that the cooling capacity of the battery pack 110 is more matched with the temperature of the battery pack 110, which is beneficial to improving the cooling effect of the air-conditioning module 300 on the battery pack 110 and realizing rapid cooling of the battery pack 110.

[0047] Furthermore, if the temperature rise rate between the first moment and the second moment is less than 0°C / min, the cooling capacity of the air-conditioning module 300 is reduced or maintained, and the temperature of the battery pack 110 at the fourth moment after the second moment is obtained, wherein the difference between the fourth moment and the second moment is not less than the difference between the second moment and the first moment.

[0048] That is to say, when it is detected that the temperature rise rate of the battery pack 110 between the first moment and the second moment is less than 0°C / min, it means that the temperature of the battery pack 110 has dropped between the first moment and the second moment. At this time, the interval between the fourth moment and the second moment can be extended, and the temperature of the battery pack 110 can be detected again within a longer period of time, so that the cooling capacity of the air-conditioning module 300 can be adjusted again after a longer period of time. Thus, the thermal management system 1 can control the time detection of the battery pack 110 temperature according to the temperature rise rate of the battery pack 110, and then the time interval for detecting the temperature of the battery pack 110 can be extended when the battery pack 110 cools down to avoid frequent adjustment of the cooling capacity of the air-conditioning module 300, and the cooling capacity of the air-conditioning module 300 can meet the cooling requirements of the battery pack 110, which is conducive to simplifying the control logic of the thermal management system 1.

[0049] Therefore, the thermal management system 1 can adjust the temperature sampling time of the battery pack 110 according to the change of the temperature rise rate of the battery pack 110, making the sampling time more flexible, and then the cooling capacity of the air-conditioning module 300 can be adjusted more flexibly, so that the cooling capacity is more matched with the temperature of the battery pack 110, the cooling effect is better, and it is beneficial to save energy consumption.

[0050] It should be noted that, after the air-conditioning module 300 operates at the initial cooling capacity and cools the battery pack 110, the thermal management system 1 of the embodiment of the present invention will cyclically detect the temperature of the battery pack 110 at intervals, and continuously adjust the cooling capacity of the air-conditioning module 300, as well as adjust the interval at the next moment according to the temperature rise rate at the previous moment, until the temperature of the battery pack 110 drops below the preset temperature value, and then the air-conditioning module 300 will be stopped from cooling the battery pack 110.

[0051] Among them, the interval between the first moment and the second moment is usually less than 5 minutes. In this way, after the air-conditioning module 300 cools the battery pack 110 with the initial cooling capacity for a maximum of 5 minutes, the temperature of the battery pack 110 and the temperature rise rate between the first moment and the second moment will be obtained again. This can avoid the interval between the first moment and the second moment being too long, thereby avoiding a sharp rise in the temperature of the battery pack 110 between the first moment and the second moment, which is conducive to frequently detecting the temperature of the battery pack 110 and meeting the cooling requirements of the battery pack 110 by adjusting the cooling capacity of the air-conditioning module 300, thereby having a better cooling effect on the battery pack 110.

[0052] As such, the control method of the thermal management system according to the embodiment of the present invention has the advantages of flexible sampling time, fast cooling response and good cooling effect.

[0053] In some specific embodiments of the present invention, Figure 1 As shown, controlling the air conditioning module 300 to operate at the initial cooling capacity includes:

[0054] The temperature of the battery pack 110 at the fifth moment before the first moment is obtained, the temperature rise rate of the battery pack 110 from the fifth moment to the first moment is calculated, and the initial cooling capacity is calculated according to the temperature rise rate of the battery pack 110 from the fifth moment to the first moment.

[0055] That is to say, before the air-conditioning module 300 operates at the initial cooling capacity, the temperature of the battery pack 110 will be detected first, and then the temperature rise rate between the fifth moment and the first moment can be calculated, so that the appropriate cooling capacity can be matched according to the temperature rise rate between the fifth moment and the first moment, so that the cooling capacity of the air-conditioning module 300 can meet the cooling demand of the battery pack 110, and then the initial cooling capacity can be used to quickly and effectively reduce the temperature of the battery pack 110, avoiding the battery pack 110 from continuing to rise significantly, thereby avoiding the battery pack 110 from rising too much between the first moment and the second moment, and the thermal management system 1 has a better cooling effect on the battery pack 110.

[0056] Among them, the interval between the fifth moment and the first moment is usually less than 10 minutes, so that the air-conditioning module 300 can determine the initial cooling capacity according to the heating rate of the air-conditioning module 300 within 10 minutes before the operation. The interval between the fifth moment and the first moment is small, which can improve the accuracy of the heating rate of the air-conditioning module 300 before the operation, so that the initial cooling capacity that is more suitable for the heating rate before the operation of the air-conditioning module 300 can be determined, so that the initial cooling capacity can better meet the cooling requirements of the battery pack 110, and further improve the cooling effect of the air-conditioning module 300 on the battery pack 100.

[0057] In some specific embodiments of the present invention, Figure 1 As shown, the initial cooling capacity is calculated according to the temperature rise rate of the battery pack 110 from the fifth moment to the first moment, including:

[0058] Calculate the speed of the compressor 310, the speed of the fan 340, and the opening of the expansion valve 330 of the air conditioning module 300 according to the temperature rise rate of the battery pack 110 from the fifth moment to the first moment;

[0059] The initial cooling capacity is determined according to the rotation speed of the compressor 310 , the rotation speed of the fan 340 , and the opening degree of the expansion valve 330 .

[0060] Specifically, when the temperature rise rate of the battery pack 110 from the fifth moment to the first moment is higher, the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330 of the air-conditioning module 300 are controlled to be larger, so that the initial cooling capacity can be larger to meet the cooling demand of the battery pack 110. Even if the temperature rise rate of the battery pack 110 is faster, the temperature of the battery pack 110 can be quickly reduced by the initial cooling capacity.

[0061] When the temperature rise rate of the battery pack 110 from the fifth moment to the first moment is lower, the smaller the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330 of the air-conditioning module 300 are controlled, so that the initial cooling capacity can be smaller, while meeting the cooling demand of the battery pack 110, it can also avoid excessive cooling capacity, thereby avoiding the temperature of the battery pack 110 from being too high and avoiding the temperature of the battery pack 110 from dropping too low, so that the battery pack 110 can be maintained at a more suitable temperature, so as to keep the battery pack 110 with a strong storage capacity and help save energy consumption of the air-conditioning module 300.

[0062] It should be noted that, between the first moment and the second moment, between the second moment and the third moment, or between the second moment and the fourth moment, when it is necessary to adjust the cooling capacity of the air-conditioning module 300, it is possible to adjust the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330. The greater the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330, the greater the cooling capacity of the air-conditioning module 300, and the smaller the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330, the smaller the cooling capacity of the air-conditioning module 300.

[0063] In some specific embodiments of the present invention, Figure 2 As shown, if the temperature rise rate of the battery pack 110 from the first moment to the second moment is not less than 0°C / min, it is determined whether the temperature rise rate of the battery pack 110 from the first moment to the second moment is not less than a preset temperature rise rate;

[0064] If so, the difference between the third moment and the second moment is no greater than one-half the difference between the second moment and the first moment;

[0065] If not, the difference between the third moment and the second moment is greater than half of the difference between the second moment and the first moment.

[0066] For example, the preset heating rate may be 1° C. / min.

[0067] That is to say, when the temperature rise rate of the battery pack 110 from the first moment to the second moment is greater than or equal to 1°C / min, it means that the temperature rise rate of the battery pack 110 from the first moment to the second moment is faster. At this time, the difference between the third moment and the second moment is adjusted to be less than or equal to half of the difference between the second moment and the first moment. In this way, the interval between the third moment and the second moment is smaller, and the thermal management system 1 can detect the temperature of the battery pack 110 again after a shorter time, and adjust the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330 again according to the temperature of the battery pack 110, thereby avoiding the battery pack 110 from heating up rapidly at a larger temperature rise rate, thereby avoiding a substantial increase in the temperature of the battery pack 110, and the air-conditioning system's cooling response to the battery pack 110 is more accurate, and the temperature reduction regulation effect is better.

[0068] When the temperature rise rate of the battery pack 110 from the first moment to the second moment is less than 1°C / min, it means that the temperature rise rate of the battery pack 110 from the first moment to the second moment is slow. At this time, the difference between the third moment and the second moment is adjusted to be greater than half of the difference between the second moment and the first moment. In this way, the interval between the third moment and the second moment is more appropriate. On the one hand, it can avoid the interval between the third moment and the second moment being too large, so that the thermal management system 1 can detect the temperature of the battery pack 110 again after a shorter time, and adjust the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330 again according to the temperature of the battery pack 110, thereby avoiding the battery pack 110 from rapidly heating up at a larger temperature rise rate, thereby avoiding a substantial increase in the temperature of the battery pack 110. On the other hand, it can avoid the interval between the third moment and the second moment being too small, avoiding the thermal management system 1 from frequently detecting the temperature of the battery pack 110, while ensuring sufficient cooling capacity of the air-conditioning module 300 and reducing the energy consumption of the thermal management system 1.

[0069] In some specific embodiments of the present invention, Figure 1 As shown, if the temperature rise rate of the battery pack 110 from the first moment to the second moment is less than 0°C / min, it is determined whether the temperature of the battery pack 110 at the fourth moment is less than the preset temperature value;

[0070] If so, the air conditioning module 300 is controlled to stop running.

[0071] When the temperature rise rate of the battery pack 110 from the first moment to the second moment is less than 0°C / min, that is, the temperature of the battery pack 110 is decreasing from the first moment to the second moment, the temperature of the battery pack 110 at the fourth moment is detected. If the temperature of the battery pack 110 is less than the preset temperature value, it means that the temperature of the battery pack 110 has dropped to a suitable temperature range. At this time, there is no need to continue to cool the battery pack 110, and the air-conditioning module 300 can be turned off, thereby reducing the energy consumption of the air-conditioning module 300. Of course, when the temperature of the battery pack 110 rises to the preset temperature value again, the air-conditioning module 300 is turned on again, and the air-conditioning module 300 is controlled to run at the initial cooling capacity and cool the battery pack 110.

[0072] In some specific embodiments of the present invention, the preset temperature value is 35°C to 40°C. For example, the preset temperature value can be 35°C, 36°C, 37°C, 38°C, 39°C or 40°C. This can, on the one hand, prevent the preset temperature value from being too high, thereby preventing the air conditioning module 300 from being started to cool the battery pack 110 only after the temperature of the battery pack 110 reaches a higher preset temperature value, effectively preventing the temperature of the battery pack 110 from being too high. On the other hand, it can prevent the preset temperature value from being too low, thereby preventing the air conditioning module 300 from being started to cool the battery pack 110 only after the temperature of the battery pack 110 reaches a lower preset temperature value, avoiding overcooling, and preventing the temperature of the battery pack 110 from frequently fluctuating around the preset temperature value, thereby avoiding frequent starting and stopping of the air conditioning module 300.

[0073] In addition, the preset temperature rise rate is 1°C / min to 3°C / min. For example, the preset temperature rise rate can be 1°C / min, 2°C / min or 3°C / min. This avoids the preset temperature rise rate being too small, thereby avoiding frequent temperature detection of the battery pack 110 when the temperature rise rate of the battery pack 110 is low, which is beneficial to simplifying the control program of the thermal management system 1 and avoiding frequent adjustment of the air-conditioning module 300. On the other hand, it can avoid the preset temperature rise rate being too high, thereby avoiding the temperature detection of the battery pack 110 being too slow when the temperature rise rate of the battery pack 110 is high, so that the air-conditioning module 300 frequently adjusts the cooling capacity when the temperature rise rate of the battery pack 110 is high, so that the cooling capacity of the air-conditioning module 300 can fully meet the cooling demand of the battery pack 110, and the cooling effect on the battery pack 110 is better.

[0074] The following describes a thermal management system 1 according to an embodiment of the present invention with reference to the accompanying drawings. The thermal management system 1 includes a battery pack 110 , a battery pack water path 100 , a first heat exchanger 200 , an air conditioning module 300 , a temperature sensor, and a controller.

[0075] The battery pack 110 is connected to the battery pack water path 100. The first heat exchanger 200 has a first heat exchange channel 210 and a second heat exchange channel 220. The first heat exchange channel 210 and the second heat exchange channel 220 exchange heat. The first heat exchange channel 210 is connected to the battery pack water path 100. The air-conditioning module 300 is connected to the second heat exchange channel 220 and is used to detect the temperature of the battery pack 110. The controller is connected to the temperature sensor and the air-conditioning module 300 respectively, and is used to obtain the temperature value detected by the temperature sensor, calculate the temperature rise rate of the battery pack 110 according to the temperature value, and control the opening and closing of the air-conditioning module 300, and adjust the cooling capacity of the air-conditioning module 300 according to the temperature rise rate of the battery pack 110.

[0076] Therefore, when the controller obtains that the temperature value detected by the temperature sensor reaches the preset temperature value, it can control the air-conditioning module 300 to turn on. At this time, the first heat exchanger 200 acts as an evaporator, and the coolant in the battery pack water path 100 can take away the heat of the battery pack 110 after flowing through the battery pack 110. The air-conditioning module 300 can absorb the heat of the battery pack water path 100 through the first heat exchanger 200, and then reduce the temperature of the coolant in the battery pack water path 100, so that the heat of the battery pack 110 can be absorbed through the air-conditioning module 300 to achieve cooling of the battery pack 110.

[0077] The thermal management system 1 according to the embodiment of the present invention has the advantages of flexible sampling time, fast cooling response and good cooling effect by utilizing the control method of the thermal management system according to the above embodiment of the present invention.

[0078] In some specific embodiments of the present invention, Figure 3 As shown, the air conditioning module 300 includes a compressor 310 , a second heat exchanger 320 , an expansion valve 330 and a fan 340 .

[0079] The second heat exchanger 320 is connected between the liquid outlet of the compressor 310 and the expansion valve 330, and the second heat exchange channel 220 is connected between the expansion valve 330 and the liquid inlet of the compressor 310. The expansion valve 330 is used to adjust the flow of the second heat exchange channel 220. The fan 340 is adjacent to the second heat exchanger 320 and is used to dissipate heat for the second heat exchanger 320. The controller is respectively connected to the compressor 310, the expansion valve 330 and the fan 340, and adjusts the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330 according to the temperature rise rate of the battery pack 110.

[0080] Thus, the air conditioning module 300 can adjust the cooling capacity of the air conditioning module 300 by adjusting the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330. Specifically, the greater the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330, the greater the cooling capacity of the air conditioning module 300; the smaller the speed of the compressor 310, the speed of the fan 340 and the opening of the expansion valve 330, the smaller the cooling capacity of the air conditioning module 300. The greater the opening, the greater the flow rate of the refrigerant in the air-conditioning module 300 will be, which can improve the heat exchange efficiency of the air-conditioning module 300 through the first heat exchanger 200 and the battery pack water path 100 per unit time. The fan 340 can dissipate heat for the second heat exchanger 320. Therefore, when the speed of the fan 340 increases, the heat dissipation effect of the second heat exchanger 320 is better. The air-conditioning module 300 can quickly release heat into the air through the second heat exchanger 320, and then can quickly absorb the heat of the battery pack 110, and the heat dissipation effect is better.

[0081] In some specific embodiments of the present invention, Figure 3 As shown, the air conditioning module 300 further includes a third heat exchanger 350 and a passenger compartment expansion valve 360 ​​.

[0082] The third heat exchanger 350 is connected in parallel with the first heat exchanger 200 for cooling the passenger compartment of the vehicle. The passenger compartment expansion valve 360 ​​is connected in series with the third heat exchanger 350 and in parallel with the expansion valve 330 for regulating the flow of the third heat exchanger 350.

[0083] That is to say, when the air-conditioning module 300 is cooling the passenger compartment, the second heat exchanger 320 can act as a condenser, the third heat exchanger 350 can act as an evaporator, the air in the passenger compartment can flow through the third heat exchanger 350 and exchange heat with the third heat exchanger 350, and then the passenger compartment can be cooled by the third heat exchanger 350, and the flow rate of the refrigerant flowing through the third heat exchanger 350 can be adjusted by the passenger compartment expansion valve 360, and then the cooling capacity of the passenger compartment by the air-conditioning module 300 can be adjusted.

[0084] Therefore, the air-conditioning module 300 can cool the battery pack water circuit 100 and the passenger compartment at the same time, with a higher degree of integration. Moreover, by adjusting the opening of the expansion valve 330 and the passenger compartment expansion valve 360, the ratio of the refrigerant flowing to the first heat exchanger 200 and the refrigerant flowing to the third heat exchanger 350 can be adjusted. In this way, the air-conditioning module 300 can adjust the ratio of the refrigerant flowing to the first heat exchanger 200 and the refrigerant flowing to the third heat exchanger 350 according to the cooling requirements of the battery pack 110 and the cooling requirements of the passenger compartment, thereby achieving simultaneous cooling of the battery pack 110 and the passenger compartment.

[0085] In some specific embodiments of the present invention, Figure 3As shown, the thermal management system 1 further includes an electric assembly water circuit 400 and a motor fan 430 .

[0086] The electric assembly water circuit 400 includes a motor 410 and a motor radiator 420 . The motor radiator 420 is staggered with the second heat exchanger 320 . The motor fan 430 is adjacent to the motor radiator 420 for dissipating heat for the motor radiator 420 .

[0087] Therefore, the motor radiator 420 can dissipate heat for the motor 410, and the motor fan 430 can accelerate the heat dissipation efficiency of the motor radiator 420, so that the heat dissipation effect of the motor radiator 420 is better, thereby being able to quickly cool down the motor 410. In addition, by staggering the motor radiator 420 and the second heat exchanger 320, and using the motor fan 430 to dissipate heat for the motor radiator 420 alone, and using the fan 340 to dissipate heat for the second heat exchanger 320 alone, it is possible to avoid interference between the heat of the motor radiator 420 and the heat of the second heat exchanger 320, and the heat dissipation effect of the motor radiator 420 and the second heat exchanger 320 is better, and the heat dissipation efficiency is higher.

[0088] A vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The vehicle includes the thermal management system 1 according to the above-described embodiment of the present invention.

[0089] The vehicle according to the embodiment of the present invention has the advantages of flexible sampling time, fast cooling response and good cooling effect by utilizing the thermal management system 1 according to the above embodiment of the present invention.

[0090] The control method of the thermal management system according to the embodiment of the present invention, the thermal management system 1 and other components and operations of the vehicle are well known to those skilled in the art and will not be described in detail here.

[0091] In this specification, reference to terms such as "specific embodiment" and "specific example" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0092] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A control method for a thermal management system, characterized in that: include: Get the temperature of the battery pack; Determining whether the temperature of the battery pack reaches a preset temperature value; If so, controlling the air conditioning module to operate at an initial cooling capacity and cool the battery pack; Recording the time when the temperature of the battery pack reaches a preset temperature value as a first moment, obtaining the temperature of the battery pack at a second moment after the first moment, calculating the temperature rise rate of the battery pack from the first moment to the second moment, and determining whether the temperature rise rate of the battery pack from the first moment to the second moment is not less than 0° C. / min; If so, increasing the cooling capacity of the air conditioning module, obtaining the temperature of the battery pack at a third moment after the second moment, and adjusting the cooling capacity of the air conditioning module again according to the temperature rise rate between the second moment and the third moment, wherein the difference between the third moment and the second moment is less than the difference between the second moment and the first moment; If not, reducing or maintaining the cooling capacity of the air-conditioning module, obtaining the temperature of the battery pack at a fourth moment after the second moment, and adjusting the cooling capacity of the air-conditioning module again according to the temperature rise rate between the second moment and the fourth moment, wherein the difference between the fourth moment and the second moment is not less than the difference between the second moment and the first moment; The controlling the air conditioning module to operate at the initial cooling capacity includes: obtaining the temperature of the battery pack at a fifth moment before the first moment, calculating the temperature rise rate of the battery pack from the fifth moment to the first moment, and calculating the initial cooling capacity according to the temperature rise rate of the battery pack from the fifth moment to the first moment; and If the temperature rise rate of the battery pack from the first moment to the second moment is not less than 0° C. / min, determining whether the temperature rise rate of the battery pack from the first moment to the second moment is not less than a preset temperature rise rate; If so, the difference between the third moment and the second moment is no greater than half the difference between the second moment and the first moment; If not, the difference between the third moment and the second moment is greater than half of the difference between the second moment and the first moment.

2. The control method of the thermal management system according to claim 1, characterized in that: The calculating the initial cooling capacity according to the temperature rise rate of the battery pack from the fifth moment to the first moment includes: Calculating the compressor speed, fan speed, and expansion valve opening of the air conditioning module according to the temperature rise rate of the battery pack from the fifth moment to the first moment; The initial cooling capacity is determined according to the compressor speed, the fan speed, and the expansion valve opening.

3. The control method of the thermal management system according to claim 1, characterized in that: The preset temperature value is 35℃~40℃; The preset temperature rise rate is 1°C / min to 3°C / min.

4. The control method of the thermal management system according to claim 1, characterized in that: If the temperature rise rate of the battery pack from the first moment to the second moment is less than 0° C. / min, determining whether the temperature of the battery pack at the fourth moment is less than the preset temperature value; If so, the air conditioning module is controlled to stop running.

5. A thermal management system, characterized in that: A control method for implementing a thermal management system according to any one of claims 1 to 4, wherein the thermal management system comprises: Battery pack; a battery pack water channel, wherein the battery pack is connected to the battery pack water channel; a first heat exchanger, the first heat exchanger having a first heat exchange channel and a second heat exchange channel, the first heat exchange channel and the second heat exchange channel exchanging heat, the first heat exchange channel being in communication with the battery pack water channel; an air conditioning module, the air conditioning module being in communication with the second heat exchange channel; a temperature sensor, configured to detect the temperature of the battery pack; A controller is connected to the temperature sensor and the air-conditioning module respectively, and is used to obtain the temperature value detected by the temperature sensor, calculate the temperature rise rate of the battery pack according to the temperature value, control the opening and closing of the air-conditioning module, and adjust the cooling capacity of the air-conditioning module according to the temperature rise rate of the battery pack.

6. The thermal management system according to claim 5, characterized in that: The air conditioning module comprises: A compressor, a second heat exchanger, and an expansion valve, wherein the second heat exchanger is connected between the liquid outlet of the compressor and the expansion valve, the second heat exchange channel is connected between the expansion valve and the liquid inlet of the compressor, and the expansion valve is used to adjust the flow rate of the second heat exchange channel; a fan, the fan being adjacent to the second heat exchanger and configured to dissipate heat for the second heat exchanger; The controller is connected to the compressor, the expansion valve and the fan respectively, and adjusts the speed of the compressor, the speed of the fan and the opening of the expansion valve according to the temperature rise rate of the battery pack.

7. The thermal management system according to claim 6, characterized in that: The air conditioning module further includes: a third heat exchanger, connected in parallel with the first heat exchanger, for cooling a passenger compartment of the vehicle; A passenger compartment expansion valve is connected in series with the third heat exchanger and in parallel with the expansion valve, and is used to adjust the flow of the third heat exchanger.

8. A vehicle, characterized in that: Comprising a thermal management system according to any one of claims 5-7.

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