Control method, device and equipment of heat pump system, storage medium and vehicle

Abstract

The invention provides a control method, device and equipment of a heat pump system, a storage medium and a vehicle. The heat pump system comprises a refrigerant loop, a passenger compartment loop, a battery loop and an electric drive loop. The method comprises the steps that after low-temperature fast charging is conducted on a vehicle battery, when a passenger compartment heating request is received, the environment temperature, the lowest battery cell temperature of the battery in a battery loop and the electric drive outlet water temperature in an electric drive loop are obtained; and selectively controlling at least one of the battery loop and the electric drive loop to release heat to the refrigerant loop or the passenger compartment loop based on the environment temperature, the lowest temperature of the battery cell and the water temperature of the electric drive outlet so as to compensate heat for the passenger compartment. According to the invention, the optimal low-temperature heat source can be selected under the condition that the battery discharge is not influenced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control method, device, equipment, storage medium and vehicle for a heat pump system. Background Art

[0002] With the development of new energy and the improvement of environmental awareness, the market share of electric vehicles has gradually increased. The cruising range of electric vehicles in winter is greatly reduced. On the one hand, low temperature conditions affect battery discharge, and on the other hand, the energy consumption of passenger compartment heating increases under low temperature conditions (about 20%). Therefore, under the premise of meeting the comfort of the passenger compartment, it is necessary to reduce heating energy consumption and improve the energy utilization rate of the thermal management system. The thermal management heating systems currently on the market include: PTC (high-pressure liquid or air heater) system and heat pump system. The PTC system is relatively simple, but has low energy utilization, and is gradually being replaced by the heat pump system. However, the heat pump system is limited by the characteristics of the refrigerant (R134a) and the reverse Carnot cycle, and its thermal efficiency is strongly related to the low-temperature heat source. The low-temperature heat source of the heat pump system in current technology generally uses electric drive waste heat, and a small part can use battery waste heat. However, the heat load in winter is relatively large, and a single heat source is prone to cause the temperature of the low-temperature heat source to decay, reduce the utilization efficiency of the heat pump, and cause energy waste. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a control method, device, equipment, storage medium and vehicle for a heat pump system, which can select the optimal low-temperature heat source without affecting battery discharge.

[0004] One aspect of an embodiment of the present application provides a control method for a heat pump system. The heat pump system includes a refrigerant circuit, a passenger compartment circuit, a battery circuit, and an electric drive circuit. The method includes: after low-temperature fast charging of the vehicle battery, when a passenger compartment heating request is received, obtaining the ambient temperature, the minimum temperature of the battery cell in the battery circuit, and the electric drive outlet water temperature in the electric drive circuit; and based on the ambient temperature, the minimum temperature of the battery cell, and the electric drive outlet water temperature, selectively controlling at least one of the battery circuit and the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment.

[0005] Further, the selective control of at least one of the battery circuit and the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature includes: when it is determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature that the entry condition for battery waste heat utilization is met, the battery circuit is controlled to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment; when it is determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature that the entry condition for battery plus electric drive waste heat utilization is met, the battery circuit and the electric drive circuit are controlled to be connected in series and release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment; and when it is determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature that the entry condition for electric drive waste heat utilization is met, the electric drive circuit is controlled to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment.

[0006] Furthermore, the entry conditions for battery waste heat utilization are determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature, including: when the ambient temperature is lower than a preset first ambient temperature threshold, the minimum temperature of the battery cell is not lower than a preset first battery cell temperature threshold, and the minimum temperature of the battery cell is greater than the preset first temperature threshold relative to the electric drive outlet water temperature, determining that the entry conditions for battery waste heat utilization are met.

[0007] Furthermore, the entry conditions for utilizing the waste heat of the battery plus the electric drive are determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature, including: when the ambient temperature is lower than a preset first ambient temperature threshold, the minimum temperature of the battery cell is not lower than a preset first battery cell temperature threshold, and the minimum temperature of the battery cell is not greater than a preset first temperature threshold and not less than a preset second temperature threshold relative to the electric drive outlet water temperature, it is determined that the entry conditions for utilizing the waste heat of the battery plus the electric drive are met.

[0008] Furthermore, the entry condition for utilizing waste heat from the electric drive is determined based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature, including: when the ambient temperature is higher than a preset second ambient temperature threshold, the minimum temperature of the battery cell is not higher than a preset second battery cell temperature threshold, and the minimum temperature of the battery cell is lower than the preset second temperature threshold relative to the electric drive outlet water temperature, the entry condition for utilizing waste heat from the electric drive is determined to be satisfied.

[0009] Furthermore, the method also includes: when fast charging and heating the battery, adjusting the threshold value of the minimum temperature of the battery cell for the battery heating exit condition according to the ambient temperature, wherein the lower the ambient temperature, the higher the minimum temperature of the battery cell for the battery heating exit condition.

[0010] Furthermore, the method also includes: when fast charging and cooling the battery, adjusting the threshold value of the maximum temperature of the battery cells for the battery cooling entry condition according to the ambient temperature, wherein the lower the ambient temperature, the higher the maximum temperature of the battery cells for the battery cooling entry condition.

[0011] Another aspect of the embodiments of the present application provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method of the heat pump system as described above when executing the computer program.

[0012] Another aspect of an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the control method of the heat pump system as described above are implemented.

[0013] Another aspect of an embodiment of the present application provides a control device for a vehicle heat pump system. The heat pump system includes a refrigerant circuit, a passenger compartment circuit, a battery circuit and an electric drive circuit, and the control device includes an acquisition module and a control module. The acquisition module is used to obtain the ambient temperature, the minimum temperature of the battery cells in the battery circuit and the battery therein, and the electric drive outlet water temperature in the electric drive circuit after the vehicle battery is fast charged at low temperature, when a passenger compartment heating request is received. The control module is used to selectively control at least one of the battery circuit and the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit based on the ambient temperature, the minimum temperature of the battery cells and the electric drive outlet water temperature to supplement heat for the passenger compartment.

[0014] Another aspect of the embodiments of the present application provides a vehicle, wherein the vehicle includes a heat pump system and a control device for the vehicle heat pump system as described above, wherein the heat pump system includes a refrigerant circuit, a passenger compartment circuit, a battery circuit, and an electric drive circuit, and the control device is used to control the heat pump system.

[0015] The control method of the heat pump system of one or more embodiments of the present application can selectively control the battery circuit and / or the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit according to the specific conditions of the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature. This can improve the stability and temperature of the low-temperature heat source without affecting the battery discharge, thereby improving the energy utilization rate of the heat pump.

[0016] The control method of the heat pump system of one or more embodiments of the present application can expand the heat storage capacity of the battery during fast charging and extend the stable operation time of the heat pump under low-temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a heat pump system according to an embodiment of the present application.

[0018] Figure 2 This is a flow chart of a control method for a heat pump system according to an embodiment of the present application.

[0019] Figure 3 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when utilizing battery waste heat.

[0020] Figure 4 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when battery plus electric drive waste heat utilization is selected.

[0021] Figure 5 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when utilizing waste heat from electric drive.

[0022] Figure 6 The present invention is a schematic block diagram of a computer device according to an embodiment of the present invention.

[0023] Figure 7 A schematic block diagram of a control device for a heat pump system according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0025] The control method, device, equipment, storage medium and vehicle of the heat pump system of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0026] Figure 1 The schematic diagram of the structure of a heat pump system 100 according to an embodiment of the present application is disclosed. Figure 1 As shown, the heat pump system 100 includes a refrigerant circuit 110, a passenger compartment circuit 140, a battery circuit 150 and an electric drive circuit 160. The passenger compartment circuit 140 includes a heater water pump HCWP. The battery circuit 150 includes a battery 151 and a battery water pump BCPF. The electric drive circuit 160 includes an electric drive 161 and an electric drive water pump EDCP.

[0027] The refrigerant circuit 110 includes a first refrigerant circuit 120 and a second refrigerant circuit 130. The first refrigerant circuit 120 includes a compressor 111, a first heat exchanger 112, a first throttle valve BEXV, a second heat exchanger 113, and a second throttle valve AEXV. The exhaust port of the compressor 111 is connected to the first end of the first heat exchanger 112, the second end of the first heat exchanger 112 is connected to one end of the first throttle valve BEXV, the other end of the first throttle valve BEXV is connected to the air intake port of the compressor 111 through the second heat exchanger 113, and the two ends of the second throttle valve AEXV are respectively connected to the air intake port and the exhaust port of the compressor 111. The second refrigerant circuit 130 includes a third throttle valve EEXV and a third heat exchanger 114. One end of the third throttle valve EEXV is connected to the second end of the second heat exchanger 113, and the other end of the third throttle valve EEXV is connected to the air intake port of the compressor 111 through the third heat exchanger 114. The first heat exchanger 112 may be a water-cooled condenser, and the third heat exchanger 114 may be an evaporator. The first throttle valve BEXV, the second throttle valve AEXV, and the third throttle valve EEXV may be electronic expansion valves.

[0028] The heat pump system 100 further includes a nine-way valve 170 and a three-way valve HCTV. The refrigerant circuit 110 and the passenger compartment circuit 140 may be connected to the battery circuit 150 and the electric drive circuit 160 through the nine-way valve 170 and the three-way valve HCTV.

[0029] The present application provides a control method for a heat pump system. Figure 2 A flow chart of a control method for a heat pump system according to an embodiment of the present application is disclosed. Figure 2 As shown, a control method of a heat pump system according to an embodiment of the present application may include steps S1 to S4.

[0030] In step S1, the vehicle battery is fast charged at low temperature.

[0031] In step S2, it is monitored whether a passenger compartment heating request is received. When the monitoring result is "yes", the process proceeds to step S3. Otherwise, the process returns to step S2 to continue monitoring.

[0032] In step S3 , when a passenger compartment heating request is received, the ambient temperature T0 , the minimum temperature Tmin of the battery cells in the battery circuit 150 , and the electric drive outlet water temperature Tout in the electric drive circuit 160 are obtained.

[0033] In step S4, at least one of the battery circuit 150 and the electric drive circuit 160 can be selectively controlled to release heat to the refrigerant circuit 110 or the passenger compartment circuit 140 to provide supplemental heat to the passenger compartment based on the ambient temperature T0, the minimum battery cell temperature Tmin and the electric drive outlet water temperature Tout.

[0034] In some embodiments, step S4 may further include steps S41 to S43.

[0035] In step S41, when the entry conditions for utilizing the battery waste heat are determined to be met based on the ambient temperature T0, the minimum temperature of the battery cell Tmin and the electric drive outlet water temperature Tout, the battery circuit 150 is controlled to release heat to the refrigerant circuit 110 or the passenger compartment circuit 140, thereby utilizing the battery waste heat to supplement the heat for the passenger compartment.

[0036] The entry conditions for battery waste heat utilization are:

[0037] "Ambient temperature = low, battery residual heat status = usable, and battery temperature relative to electric drive = high."

[0038] The exit condition for battery waste heat utilization is: the entry condition for battery waste heat utilization is not met.

[0039] Among them, condition one: "ambient temperature = low" means that the ambient temperature T0 is lower than a preset first ambient temperature threshold, for example: T0≤0°C.

[0040] Condition 2: "Battery residual heat state = available" means that the minimum cell temperature Tmin is not lower than the preset first cell temperature threshold X1, that is, Tmin ≥ X1. The preset first cell temperature threshold X1 may be a non-fixed value, which may be determined according to the ambient temperature T0, wherein the lower the ambient temperature T0, the higher the first cell temperature threshold X1.

[0041] Condition 3: "Battery relative electric drive temperature = high" means that the lowest temperature Tmin of the battery cell relative to the electric drive outlet water temperature Tout is greater than a preset first temperature threshold, for example, Tmin≥Tout+6°C. The first temperature threshold can be pre-calibrated.

[0042] When the above three conditions are met at the same time, the entry conditions for battery waste heat utilization are met and the battery waste heat utilization is entered. At this time, the battery circuit 150 will be controlled to release heat to the refrigerant circuit 110 or the passenger compartment circuit 140 to supplement heat for the passenger compartment.

[0043] Since the ambient heat source is theoretically infinite, the electric drive waste heat or battery waste heat will only be used when the ambient temperature T0 is low. The use of battery waste heat will lower the temperature of the battery cell. When the temperature of the battery cell is too low, it will affect the battery discharge. Therefore, when using the battery waste heat, it should be ensured that it does not affect the battery discharge, that is, the minimum battery cell temperature Tmin should be greater than or equal to a certain threshold; only when the battery temperature is significantly higher than the electric drive temperature, the battery waste heat is worth utilizing.

[0044] Figure 3The structure diagram of the heat pump system 100 of one embodiment of the present application when selecting battery waste heat utilization is disclosed. Figure 3 As shown, for the refrigerant circuit 110: the low-temperature and low-pressure gaseous refrigerant becomes a high-pressure and high-temperature gaseous refrigerant after the compressor 111 does work, and after the first heat exchanger 112 as a condenser releases heat, the heat is exchanged to the passenger compartment circuit 140, and becomes a high-pressure and low-temperature liquid refrigerant, and then after throttling by the first throttle valve BEXV, it becomes a low-temperature and low-pressure refrigerant, and then passes through the second heat exchanger 113 as a cooler to absorb heat, absorb the heat of the battery circuit 150, and become a low-temperature and low-pressure gaseous refrigerant, and enter the compressor 111 for the next cycle. For the passenger compartment circuit 140: the high-temperature hot water flowing through the first heat exchanger 112 as a condenser flows through the three-way valve HCTV, and then passes through the air conditioning box heat exchanger Hex for heat exchange, and releases heat to the passenger compartment. The low-temperature water that releases heat passes through the warm air water pump HCWP, and then passes through the first heat exchanger 112 as a condenser again for the next cycle. For the battery circuit 150: the low-temperature cold water flowing through the second heat exchanger 113 as a cooler passes through the nine-way valve 170 and the battery water pump BCPF, then absorbs heat through the battery, becomes high-temperature water, passes through the nine-way valve 170 again, and finally flows back to the second heat exchanger 113 as a cooler to release heat. Thus, the battery waste heat is transferred to the refrigerant circuit 110, and then transferred to the passenger compartment circuit 140 through the refrigerant circuit 110, thereby supplementing the heat to the passenger compartment.

[0045] In step S42, when the entry conditions for utilizing the waste heat of the battery and electric drive are determined to be met based on the ambient temperature T0, the minimum temperature of the battery cell Tmin and the electric drive outlet water temperature Tout, the battery circuit 150 and the electric drive circuit 160 are controlled to be connected in series and release heat to the refrigerant circuit 110 or the passenger compartment circuit 140, thereby utilizing the waste heat of the battery and electric drive to supplement heat for the passenger compartment.

[0046] The entry conditions for battery plus electric drive waste heat utilization are:

[0047] "Ambient temperature = low, battery residual heat status = usable, and battery relative to electric drive temperature = moderate."

[0048] The exit condition for battery plus electric drive waste heat utilization is: the entry condition for battery plus electric drive waste heat utilization is not met.

[0049] Among them, condition one: "ambient temperature = low" means that the ambient temperature T0 is lower than a preset first ambient temperature threshold.

[0050] Condition 2: "Battery residual heat state = available" means that the minimum temperature Tmin of the battery cell is not lower than the preset first battery cell temperature threshold value X1, that is, Tmin≥X1.

[0051] Condition 3: "Battery relative electric drive temperature = moderate" means that the minimum temperature Tmin of the battery cell relative to the electric drive outlet water temperature Tout is not greater than the preset first temperature threshold and not less than the preset second temperature threshold, for example: Tout-3°C ≤ Tmin ≤ Tout+6°C. The first temperature threshold and the second temperature threshold can be pre-calibrated.

[0052] When the above three conditions are met at the same time, the entry conditions for battery plus electric drive waste heat utilization are met, and the battery plus electric drive waste heat utilization is entered. At this time, the battery circuit 150 and the electric drive circuit 160 will be controlled to be connected in series and then release heat to the refrigerant circuit 110 or the passenger compartment circuit 140 to supplement heat for the passenger compartment.

[0053] Similarly, when utilizing the battery waste heat, it should be ensured that the battery discharge is not affected, that is, the minimum temperature Tmin of the battery cell should be greater than or equal to a certain threshold; when the battery temperature is similar to the electric drive outlet water temperature Tout, the battery circuit 150 and the electric drive circuit 160 can be connected in series, so that the battery temperature and the electric drive temperature will not weaken each other and the stability of the low-temperature heat source is improved.

[0054] Figure 4 The schematic diagram of the structure of a heat pump system 100 in one embodiment of the present application when selecting battery plus electric drive waste heat utilization is disclosed. Figure 4 As shown, for the refrigerant circuit 110: the low-temperature and low-pressure gaseous refrigerant becomes a high-pressure and high-temperature gaseous refrigerant after the compressor 111 does work, and after the first heat exchanger 112 as a condenser releases heat, the heat is exchanged to the passenger compartment circuit 140, and becomes a high-pressure and low-temperature liquid refrigerant, and then after throttling by the first throttle valve BEXV, it becomes a low-temperature and low-pressure refrigerant, and then passes through the second heat exchanger 113 as a cooler to absorb heat, absorb the heat of the battery circuit 150, and become a low-temperature and low-pressure gaseous refrigerant, and enter the compressor 111 for the next cycle. For the passenger compartment circuit 140: the high-temperature hot water flowing through the first heat exchanger 112 as a condenser flows through the three-way valve HCTV, and then passes through the air conditioning box heat exchanger Hex for heat exchange, and releases heat to the passenger compartment. The low-temperature water that releases heat passes through the warm air water pump HCWP, and then passes through the first heat exchanger 112 as a condenser again for the next cycle. For the battery plus electric drive circuit 160: the low-temperature cold water flowing through the second heat exchanger 113 as a cooler passes through the nine-way valve 170, then absorbs heat through the electric drive, then absorbs heat through the battery, becomes high-temperature water, passes through the nine-way valve 170, and finally flows back to the second heat exchanger 113 as a cooler to release heat. Thus, the residual heat of the battery plus electric drive is transferred to the refrigerant circuit 110, and then transferred to the passenger compartment circuit 140 through the refrigerant circuit 110, thereby supplementing the heat of the passenger compartment.

[0055] In step S43, when it is determined that the entry condition for the utilization of the waste heat of the electric drive is met based on the ambient temperature T0, the minimum temperature Tmin of the battery cell, and the water temperature Tout at the outlet of the electric drive, the electric drive loop 160 is controlled to release heat to the refrigerant loop 110 or the passenger compartment loop 140, so as to utilize the waste heat of the electric drive to heat the passenger compartment.

[0056] The entry condition for the utilization of the waste heat of the electric drive is as follows:

[0057] "Ambient temperature = high, or battery waste heat state = unavailable, or battery temperature relative to electric drive = low".

[0058] The exit condition for the utilization of the waste heat of the electric drive: The entry condition for the utilization of the waste heat of the electric drive is not met.

[0059] Among them, condition 1: "Ambient temperature = high" means that the ambient temperature T0 is higher than the preset second ambient temperature threshold. For example: T0 ≥ 3°C.

[0060] Condition 2: "Battery waste heat state = unavailable" means that the minimum temperature Tmin of the battery cell is not higher than the preset second battery cell temperature threshold, that is, Tmin ≤ X2°C. The preset second battery cell temperature threshold X2 can be a non-fixed value, which can be determined according to the ambient temperature T0. Among them, the lower the ambient temperature T0, the higher the second battery cell temperature threshold X2.

[0061] Condition 3: "Battery temperature relative to electric drive = low" means that the minimum temperature Tmin of the battery cell is less than the preset second temperature threshold relative to the water temperature Tout at the outlet of the electric drive. For example: Tmin < Tout - 3°C. The second temperature threshold can be calibrated in advance.

[0062] As long as any one of the above three conditions is met, the entry condition for the utilization of the waste heat of the electric drive is met, and the utilization of the waste heat of the electric drive is entered. At this time, the electric drive loop 160 will be controlled to release heat to the refrigerant loop 110 or the passenger compartment loop 140 to heat the passenger compartment.

[0063] Figure 5 Disclosed is a schematic structural diagram of the heat pump system 100 according to an embodiment of the present application when selecting the utilization of the waste heat of the electric drive. As Figure 5As shown, for the refrigerant circuit 110: the low-temperature and low-pressure gaseous refrigerant becomes a high-pressure and high-temperature gaseous refrigerant after the compressor 111 does work, and after the first heat exchanger 112 as a condenser releases heat, the heat is exchanged to the passenger compartment circuit 140, and becomes a high-pressure and low-temperature liquid refrigerant, and then after throttling by the first throttle valve BEXV, it becomes a low-temperature and low-pressure refrigerant, and then passes through the second heat exchanger 113 as a cooler to absorb heat, absorb the heat of the battery circuit 150, and become a low-temperature and low-pressure gaseous refrigerant, and enter the compressor 111 for the next cycle. For the passenger compartment circuit 140: the high-temperature hot water flowing through the first heat exchanger 112 as a condenser flows through the three-way valve HCTV, and then passes through the air conditioning box heat exchanger Hex for heat exchange, and releases heat to the passenger compartment. The low-temperature water that releases heat passes through the warm air water pump HCWP, and then passes through the first heat exchanger 112 as a condenser again for the next cycle. For the electric drive circuit 160: the low-temperature cold water flowing through the second heat exchanger 113 as a cooler passes through the nine-way valve 170, then passes through the electric drive to absorb heat, then passes through the nine-way valve 170, and finally flows back to the second heat exchanger 113 as a cooler to release heat. Thus, the waste heat of the electric drive is transferred to the refrigerant circuit 110, and then transferred to the passenger compartment circuit 140 through the refrigerant circuit 110, thereby supplementing the heat of the passenger compartment.

[0064] The heat transfer of the selected low-temperature heat source described in the above embodiments is: first, the circuit of the low-temperature heat source exchanges heat with the refrigerant circuit 110, and the heat of the low-temperature heat source is transferred to the refrigerant circuit 110, and then the heat of the refrigerant circuit 110 is further transferred to the passenger compartment circuit 140 through the heat exchange between the refrigerant circuit 110 and the passenger compartment circuit 140, thereby achieving the effect of supplementing heat to the passenger compartment using the low-temperature heat source. It can be understood that the heat transfer method of the preferred heat source of the present application is not limited to this. In other embodiments, the heat transfer of the preferred heat source can also be performed by the low-temperature heat source directly releasing heat to the passenger compartment circuit 140, that is, the circuit of the low-temperature heat source directly exchanges heat with the passenger compartment circuit 140, thereby directly transferring the heat of the low-temperature heat source to the passenger compartment circuit 140, which can also achieve the effect of supplementing heat to the passenger compartment using the low-temperature heat source.

[0065] The control method of the heat pump system of the present application can selectively control the battery circuit 150 and / or the electric drive circuit 160 to release heat to the refrigerant circuit 110 or the passenger compartment circuit 140 according to the specific conditions of the ambient temperature T0, the minimum temperature of the battery cell Tmin and the electric drive outlet water temperature Tout. Therefore, the stability and temperature of the low-temperature heat source can be improved without affecting the battery discharge, thereby improving the energy utilization rate of the heat pump.

[0066] In some embodiments, the control method of the heat pump system of the present application may further include: when fast charging and heating the battery, adjusting the threshold of the minimum cell temperature Tmin of the battery heating exit condition according to the ambient temperature T0. The lower the ambient temperature T0, the higher the minimum cell temperature Tmin of the battery heating exit condition.

[0067] The following Table 1 gives an example of the threshold value of the minimum cell temperature Tmin for the battery heating exit condition under the fast charging heating condition.

[0068] Table 1

[0069]

[0070] Among them, temp11-temp12 and temp21-temp23 in Table 1 can be determined by pre-calibration.

[0071] The control method of the heat pump system of the present application can adjust the threshold value of the minimum cell temperature Tmin of the battery heating exit condition according to the ambient temperature T0. The lower the ambient temperature T0, the higher the minimum cell temperature Tmin for exiting battery heating, thereby maximizing heat storage.

[0072] In some embodiments, the control method of the heat pump system of the present application may further include: when the battery is fast-charged and cooled, adjusting the threshold of the maximum temperature of the battery cell for the battery cooling entry condition according to the ambient temperature T0. The lower the ambient temperature T0, the higher the maximum temperature of the battery cell for the battery cooling entry condition.

[0073] Table 2 below gives an example of the threshold value of the maximum temperature of the battery cell for the battery cooling entry condition under the fast charging cooling condition.

[0074] Table 2

[0075]

[0076] Among them, temp13-temp15, temp31-temp35, and SOC1-SOC2 in Table 2 can all be determined by pre-calibration.

[0077] The control method of the heat pump system of the present application can adjust the threshold value of the maximum temperature of the battery cell for entering battery cooling according to the ambient temperature T0. The lower the ambient temperature T0, the higher the maximum temperature requirement of the battery cell entering battery cooling, thereby preventing the battery from mistakenly entering cooling and causing heat waste.

[0078] The present application also provides a computer device 200 . Figure 6 A schematic block diagram of a computer device according to an embodiment of the present application is disclosed. Figure 6As shown, a computer device 200 of an embodiment of the present application includes a processor 201, an internal bus 202, a network interface 203, a memory 204, and a non-volatile memory 205, and may also include hardware required for other services. The processor 201 can read the corresponding computer program from the non-volatile memory 205 into the memory 204 and then run it to implement the steps of the control method of the heat pump system as described above. Of course, in addition to the software implementation, the present application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic components.

[0079] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method of the heat pump system described above are implemented.

[0080] The present application also provides a control device 300 for a heat pump system. Figure 1 As shown, the heat pump system 100 includes a refrigerant circuit 110 , a passenger compartment circuit 140 , a battery circuit 150 , and an electric drive circuit 160 . Figure 7 A schematic block diagram of a control device 300 for a heat pump system according to an embodiment of the present application is disclosed. Figure 7 As shown, a control device 300 of a heat pump system according to an embodiment of the present application may include an acquisition module 301 and a control module 302 .

[0081] The acquisition module 301 can be used to obtain the ambient temperature T0, the minimum temperature Tmin of the battery cells in the battery circuit 150 and the electric drive outlet water temperature Tout in the electric drive circuit 160 after the vehicle battery is fast charged at low temperature, when a passenger compartment heating request is received.

[0082] The control module 302 can selectively control at least one of the battery circuit 150 and the electric drive circuit 160 to release heat to the refrigerant circuit 110 or the passenger compartment circuit 140 to provide supplemental heat to the passenger compartment based on the ambient temperature T0, the minimum battery cell temperature Tmin, and the electric drive outlet water temperature Tout.

[0083] The control device 300 of the heat pump system of the present application may have similar beneficial technical effects as the control method of the heat pump system described above, and therefore, it will not be described in detail here.

[0084] The present application also provides a vehicle. The vehicle includes a heat pump system 100 and a control device 300 of the vehicle heat pump system as described above. The heat pump system 100 includes a refrigerant circuit 110, a passenger compartment circuit 140, a battery circuit 150, and an electric drive circuit 160, and the control device 300 can control the heat pump system 100.

[0085] The control method, device, equipment, storage medium and vehicle of the heat pump system provided in the embodiment of the present application are introduced in detail above. Specific examples are used herein to illustrate the control method, device, equipment, storage medium and vehicle of the heat pump system in the embodiment of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system includes a refrigerant circuit, a passenger compartment circuit, a battery circuit, and an electric drive circuit. The method includes: After the vehicle battery is fast charged at low temperature, when a passenger compartment heating request is received, obtaining the ambient temperature, the minimum temperature of the battery cells in the battery circuit, and the electric drive outlet water temperature in the electric drive circuit; and Based on the ambient temperature, the minimum battery cell temperature and the electric drive outlet water temperature, at least one of the battery circuit and the electric drive circuit is selectively controlled to release heat to the refrigerant circuit or the passenger compartment circuit to provide supplemental heat to the passenger compartment.

2. The method according to claim 1, characterized in that The selectively controlling at least one of the battery circuit and the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit to provide supplementary heat to the passenger compartment based on the ambient temperature, the lowest temperature of the battery core, and the electric drive outlet water temperature comprises: When it is determined based on the ambient temperature, the lowest temperature of the battery core and the electric drive outlet water temperature that the entry condition for utilizing the battery waste heat is met, the battery circuit is controlled to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment; When it is determined based on the ambient temperature, the lowest temperature of the battery core and the water temperature at the electric drive outlet that the entry conditions for utilizing the waste heat of the battery and the electric drive are met, the battery circuit and the electric drive circuit are controlled to be connected in series and release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment; and When the entry conditions for utilizing waste heat from the electric drive are determined to be met based on the ambient temperature, the minimum temperature of the battery cell, and the electric drive outlet water temperature, the electric drive circuit is controlled to release heat to the refrigerant circuit or the passenger compartment circuit to supplement heat for the passenger compartment.

3. The method according to claim 2, characterized in that The determining of the entry conditions for satisfying battery waste heat utilization based on the ambient temperature, the lowest battery cell temperature, and the electric drive outlet water temperature includes: When the ambient temperature is lower than a preset first ambient temperature threshold, the minimum battery cell temperature is not lower than a preset first battery cell temperature threshold, and the minimum battery cell temperature is greater than the preset first temperature threshold relative to the electric drive outlet water temperature, it is determined that the entry conditions for battery waste heat utilization are met.

4. The method according to claim 2, characterized in that The determining of the entry conditions for utilizing the waste heat of the battery and electric drive based on the ambient temperature, the lowest temperature of the battery core, and the water temperature at the electric drive outlet includes: When the ambient temperature is lower than a preset first ambient temperature threshold, the minimum temperature of the battery cell is not lower than a preset first battery cell temperature threshold, and the minimum temperature of the battery cell is not greater than the preset first temperature threshold and not less than the preset second temperature threshold relative to the electric drive outlet water temperature, it is determined that the entry conditions for battery plus electric drive waste heat utilization are met.

5. The method according to claim 2, characterized in that The determining of the entry conditions for satisfying the electric drive waste heat utilization based on the ambient temperature, the lowest temperature of the battery core and the electric drive outlet water temperature includes: When the ambient temperature is higher than a preset second ambient temperature threshold, the minimum battery cell temperature is not higher than a preset second battery cell temperature threshold, and the minimum battery cell temperature relative to the electric drive outlet water temperature is lower than a preset second temperature threshold, it is determined that the entry conditions for electric drive waste heat utilization are met.

6. The method according to any one of claims 1 to 5, characterized in that Also includes: When the battery is fast charged and heated, the threshold of the minimum temperature of the battery cell for the battery heating exit condition is adjusted according to the ambient temperature. The lower the ambient temperature is, the higher the minimum temperature of the battery cell for the battery heating exit condition is.

7. The method according to any one of claims 1 to 5, characterized in that Also includes: When the battery is fast-charged and cooled, the threshold of the maximum temperature of the battery cell for the battery cooling entry condition is adjusted according to the ambient temperature. The lower the ambient temperature is, the higher the maximum temperature of the battery cell for the battery cooling entry condition is.

8. A computer device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method for the heat pump system as described in any one of claims 1 to 7 when executing the computer program.

9. 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 control method of the heat pump system according to any one of claims 1 to 7 are implemented.

10. A control device for a vehicle heat pump system, characterized in that: The heat pump system includes a refrigerant circuit, a passenger compartment circuit, a battery circuit and an electric drive circuit, and the control device includes: an acquisition module, for acquiring the ambient temperature, the lowest temperature of the battery cells in the battery circuit and the electric drive outlet water temperature in the electric drive circuit when receiving a passenger compartment heating request after the vehicle battery is fast charged at low temperature; and A control module is used to selectively control at least one of the battery circuit and the electric drive circuit to release heat to the refrigerant circuit or the passenger compartment circuit to provide supplementary heat to the passenger compartment based on the ambient temperature, the minimum temperature of the battery cell and the electric drive outlet water temperature.

11. A vehicle, characterized in that: It comprises a heat pump system and a control device for the vehicle heat pump system as claimed in claim 10, wherein the heat pump system comprises a refrigerant circuit, a passenger compartment circuit, a battery circuit and an electric drive circuit, and the control device is used to control the heat pump system.

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