Secondary loop thermal management system and electric automobile

Abstract

The invention relates to the technical field of electric vehicle thermal management, in particular to a secondary loop thermal management system and an electric vehicle, the secondary loop thermal management system comprises a refrigerant loop, a passenger compartment water loop, a battery water loop and a motor water loop, the refrigerant loop comprises a water cooling evaporator and a water cooling condenser; the passenger compartment water loop comprises a first four-way valve and a second four-way valve, a first connector of the first four-way valve is communicated with the first end of the water-cooling evaporator, a second connector of the first four-way valve is communicated with the third end of the water-cooling condenser, a first connector of the second four-way valve is communicated with the fourth end of the water-cooling condenser, and a second connector of the second four-way valve is communicated with the second end of the water-cooling evaporator. The battery water loop is respectively communicated with a fourth interface of the first four-way valve and a third interface of the second four-way valve; the motor water loop is respectively communicated with a third interface of the first four-way valve and a fourth interface of the second four-way valve; the heat exchanger is simple in structural design, low in cost and diversified in heat management mode, and the heat exchange efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle thermal management, and in particular to a secondary circuit thermal management system and an electric vehicle. Background Art

[0002] In the thermal management technology of electric vehicles, the primary circuit system is widely used. The primary circuit system generally uses the refrigerant (such as R134a) to directly exchange heat with the heat source or cold source. With the increasingly stringent environmental regulations, the environmental safety requirements for refrigerants are constantly increasing. R290 as an environmentally friendly refrigerant has gradually attracted attention. Due to the flammability of refrigerant R290, in order to meet the requirements of safety regulations, the secondary circuit system has become an option.

[0003] At present, the existing secondary loop system has the following defects: (1) The architecture design is usually more complicated, requiring more components to achieve heat exchange between refrigerant and coolant, and between coolant and cold and heat sources, which increases the complexity, cost, volume and weight of the system. (2) The thermal management mode is limited, and it is impossible to achieve the combination of heating and cooling mode and dehumidification mode. (3) Due to the introduction of coolant as an intermediary medium, the heat exchange link is increased, resulting in a decrease in heat exchange efficiency relative to the primary loop system and increased energy consumption. (4) In extremely low temperature environments, the lower heat exchange efficiency affects system performance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a secondary circuit thermal management system and an electric vehicle with simple structural design, low cost, diverse thermal management modes, and guaranteed heat exchange efficiency.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a secondary circuit thermal management system, including a refrigerant circuit, the refrigerant circuit including a water-cooled evaporator and a water-cooled condenser, and also including:

[0006] A passenger compartment water circuit, used for heat exchange in the passenger compartment;

[0007] The passenger compartment water circuit includes a first four-way valve and a second four-way valve, wherein a first interface of the first four-way valve is connected to a first end of the water-cooled evaporator, and a second interface thereof is connected to a third end of the water-cooled condenser; a first interface of the second four-way valve is connected to a fourth end of the water-cooled condenser, and a second interface thereof is connected to a second end of the water-cooled evaporator;

[0008] A battery water circuit, connected to the fourth interface of the first four-way valve and the third interface of the second four-way valve, respectively, for heat exchange of the battery;

[0009] and a motor water circuit, which is respectively connected to the third interface of the first four-way valve and the fourth interface of the second four-way valve, and is used for heat exchange of the motor;

[0010] The passenger compartment water circuit also includes a low-pressure side water pump, a PTC heater, a first three-way proportional valve, a second three-way proportional valve, a first three-way valve, a warm air core, a second three-way valve, a first water circuit three-way, a second water circuit three-way, a third water circuit three-way, a cold air core, a third three-way valve, a fourth water circuit three-way, a fifth water circuit three-way and a high-pressure side water pump, wherein a first interface of the first three-way proportional valve is connected to a first end of the water-cooled evaporator through a PTC heater, and a second interface thereof is connected to a first interface of the first four-way valve; a first interface of the second three-way proportional valve is connected to a third end of the water-cooled condenser, and a second interface thereof is connected to a second interface of the first four-way valve; a first interface of the fifth water circuit three-way is connected to a second end of the water-cooled evaporator through a low-pressure side water pump, and a second interface thereof is connected to a second interface of the second four-way valve; a first interface of the first water circuit three-way is connected to a fourth end of the water-cooled condenser through a high-pressure side water pump, and a second interface thereof is connected to a The interface is connected to the first interface of the second four-way valve; the first interface of the first three-way valve is connected to the third interface of the second three-way proportional valve, and its second interface is connected to the first interface of the second water circuit tee; the third interface of the first three-way valve is connected to the third interface of the third water circuit tee; one end of the warm air core is connected to the second interface of the second water circuit tee, and the other end of the warm air core is connected to the first interface of the second three-way valve; the second interface of the second three-way valve is connected to the third interface of the first water circuit tee, and its third interface is connected to the third interface of the fourth water circuit tee; the first interface of the third water circuit tee is connected to the third interface of the first three-way proportional valve, and its second interface is connected to one end of the cold air core; the first interface of the third three-way valve is connected to the other end of the cold air core, and its second interface is connected to the first interface of the fourth water circuit tee; the second interface of the fourth water circuit tee is connected to the third interface of the fifth water circuit tee.

[0011] Furthermore, the refrigerant circuit also includes a gas-liquid separator, a compressor and a main electronic expansion valve. The third end of the water-cooled evaporator is connected to the first end of the water-cooled condenser through the gas-liquid separator and the compressor in turn, and its fourth end is connected to the second end of the water-cooled condenser through the main electronic expansion valve.

[0012] Furthermore, the refrigerant circuit also includes a bypass electronic expansion valve, and the third end of the water-cooled evaporator is connected to the first end of the water-cooled condenser through the bypass electronic expansion valve.

[0013] Furthermore, the passenger compartment water circuit also includes a stop valve, a first interface of the stop valve is connected to the third interface of the second water circuit tee, and a second interface of the stop valve is connected to the third interface of the third three-way valve.

[0014] Furthermore, the battery water circuit includes a battery water pump, a battery cold liquid plate, a third proportional valve and a sixth water channel tee, the first interface of the third proportional valve is connected to the second interface of the sixth water channel tee, and its second interface is connected to the third interface of the second four-way valve; the first interface of the sixth water channel tee is connected to the fourth interface of the first four-way valve, and its third interface is connected to the third interface of the third proportional valve through the battery water pump and the battery cold liquid plate in sequence.

[0015] Furthermore, the motor water circuit includes a water tank, a motor, an on-board charger, a fourth three-way valve, a low-pressure radiator, a low-pressure fan and a seventh water channel. The first interface of the fourth three-way valve is connected to the first interface of the seventh water channel, and its second interface is connected to the third interface of the first four-way valve through the on-board charger and the motor in sequence; the third interface of the fourth three-way valve is connected to one end of the low-pressure radiator; the second interface of the seventh water channel is connected to the fourth interface of the second four-way valve, and its third interface is connected to the other end of the low-pressure radiator; the water tank is connected to the pipeline between the motor and the first four-way valve, and the low-pressure fan is arranged on the low-pressure radiator.

[0016] Furthermore, the refrigerant in the refrigerant circuit is R290.

[0017] An electric vehicle comprises the secondary circuit thermal management system.

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention forms a secondary circuit by arranging a refrigerant circuit, a passenger compartment water circuit, a battery water circuit and a motor water circuit. Compared with the existing secondary circuit system, the present invention reduces unnecessary components, reduces the complexity and cost of the system, enriches the thermal management mode, and improves the heat exchange efficiency and system performance.

[0020] (2) The present invention further improves the heat exchange efficiency by setting up a bypass electronic expansion valve and using it together with the main electronic expansion valve in an extremely low temperature (below -30°C) environment.

[0021] (3) The present invention places the PTC heater in the passenger compartment water circuit where the low-pressure water-cooled evaporator is located as a driving heat source. This not only effectively utilizes the low-temperature environment to improve the heating efficiency, but also simplifies the system structure and reduces costs, while avoiding the impact of traditional heating methods on system performance.

[0022] (4) The present invention realizes the series connection of the warm air core and the cold air core through the stop valve, optimizes the heat exchange process, increases the heat exchange area, improves the heat exchange efficiency, reduces energy loss, and at the same time ensures the comfort of the temperature in the car and the response speed of the system.

[0023] (5) The present invention realizes battery mixed water self-circulation through the battery water circuit, so that the battery is always maintained at the operating temperature. In an extremely low temperature environment, the battery temperature can be quickly increased, thereby improving the battery discharge efficiency and extending the battery life.

[0024] (6) The present invention recovers the waste heat of the motor by setting up a motor water circuit, realizing multiple waste heat recovery modes, and at the same time improving the heat exchange efficiency of the system in an extremely low temperature environment, reducing the demand for external heat sources, and further reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the secondary circuit thermal management system in the present invention;

[0027] Figure 2 is a flow path diagram of the refrigerant and the coolant in the passenger compartment cooling mode of the present invention;

[0028] Figure 3 is a flow path diagram of the refrigerant and the coolant in the passenger compartment + battery cooling mode of the present invention;

[0029] Figure 4 is a flow path diagram of the refrigerant and the coolant in the battery cooling mode of the present invention;

[0030] Figure 5 is a flow path diagram of the refrigerant and the coolant in the passenger compartment heating mode of the present invention;

[0031] Figure 6 is a flow path diagram of the refrigerant and the coolant in the passenger compartment + battery heating mode of the present invention;

[0032] Figure 7 is a flow path diagram of the refrigerant and the coolant in the battery heating mode of the present invention;

[0033] Figure 8 is a flow path diagram of the refrigerant and the coolant in the heating and dehumidification mode 1 of the present invention;

[0034] Fig. 9 It is a flow path diagram of the refrigerant and the coolant in the waste heat defrosting mode of the present invention;

[0035] Fig.10 is a flow path diagram of the refrigerant and the coolant in the waste heat recovery mode 1 of the present invention;

[0036] Fig.11 It is a flow path diagram of the refrigerant and the coolant in the dual heating triangle cycle mode (extremely low temperature) of the present invention.

[0037] In the figure: 101, water-cooled evaporator; 102, gas-liquid separator; 103, compressor; 104, water-cooled condenser; 105, main electronic expansion valve; 106, side electronic expansion valve; 201, low-pressure side water pump; 202, PTC heater; 203, first three-way proportional valve; 204, second three-way proportional valve; 205, first three-way valve; 206, warm air core; 207, second three-way valve; 208, first water channel three-way; 209, second water channel three-way; 210, stop valve; 211, third water channel three-way 212, cold air core; 213, third three-way valve; 214, fourth water channel three-way; 215, fifth water channel three-way; 216, first four-way valve; 217, second four-way valve; 218, high-pressure side water pump; 301, battery water pump; 302, battery cold liquid plate; 303, third proportional valve; 304, sixth water channel three-way; 401, water tank; 402, motor; 403, on-board charger; 404, fourth three-way valve; 405, low-pressure radiator; 406, low-pressure fan; 407, seventh water channel three-way. DETAILED DESCRIPTION

[0038] The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] Embodiment 1:

[0040] like Figure 1 As shown, a secondary circuit thermal management system includes a refrigerant circuit, a passenger compartment water circuit, a battery water circuit and a motor water circuit, wherein the refrigerant circuit includes a water-cooled evaporator 101 and a water-cooled condenser 104; the passenger compartment water circuit includes a first four-way valve 216 and a second four-way valve 217, wherein the first interface of the first four-way valve 216 is connected to the first end of the water-cooled evaporator 101, and the second interface thereof is connected to the third end of the water-cooled condenser 104; the first interface of the second four-way valve 217 is connected to the fourth end of the water-cooled condenser 104, and the second interface thereof is connected to the second end of the water-cooled evaporator 101, for heat exchange with the passenger compartment; the battery water circuit is respectively connected to the fourth interface of the first four-way valve 216 and the third interface of the second four-way valve 217, for heat exchange with the battery; the motor water circuit is respectively connected to the third interface of the first four-way valve 216 and the fourth interface of the second four-way valve 217, for heat exchange with the motor. Specifically, the refrigerant in the refrigerant circuit uses R290.

[0041] A secondary circuit is formed by setting up a refrigerant circuit, a passenger compartment water circuit, a battery water circuit and a motor water circuit. Compared with the existing secondary circuit system, unnecessary components are reduced, the complexity and cost of the system are reduced, and the thermal management mode is enriched, and the heat exchange efficiency and system performance are improved.

[0042] like Figure 1 As shown, the refrigerant circuit also includes a gas-liquid separator 102, a compressor 103 and a main electronic expansion valve 105. The third end of the water-cooled evaporator 101 is connected to the first end of the water-cooled condenser 104 through the gas-liquid separator 102 and the compressor 103 in sequence, and its fourth end is connected to the second end of the water-cooled condenser 104 through the main electronic expansion valve 105.

[0043] like Figure 1 As shown, the refrigerant circuit further includes a bypass electronic expansion valve 106, and the third end of the water-cooled evaporator 101 is connected to the first end of the water-cooled condenser 104 through the bypass electronic expansion valve 106. By setting the bypass electronic expansion valve 106, it can be used together with the main electronic expansion valve 105 in an extremely low temperature environment (below minus 30°C), further improving the heat exchange efficiency.

[0044] In the refrigerant circuit, the low-temperature and low-pressure R290 working fluid gas is compressed into a high-temperature and high-pressure gas by the compressor 103, and is divided into two paths. One path leads to the water-cooled condenser 104 for heating, and the other path passes through the bypass circuit where the bypass electronic expansion valve 106 is located, and is directly connected to the exhaust pipe and the intake pipe of the compressor 103, thereby realizing the electric power heating of the compressor 103.

[0045] like Figure 1As shown, the passenger compartment water circuit also includes a low-pressure side water pump 201, a PTC heater 202, a first three-way proportional valve 203, a second three-way proportional valve 204, a first three-way valve 205, a warm air core 206, a second three-way valve 207, a first water channel tee 208, a second water channel tee 209, a third water channel tee 211, a cold air core 212, a third three-way valve 213, a fourth water channel tee 214, a fifth water channel tee 215 and a high-pressure side water pump 218. The first interface of the first three-way proportional valve 203 is connected to the PTC heater 202 through the PTC heater 202. The first end of the water-cooled evaporator 101 is connected to the first end of the water-cooled evaporator 101, and its second interface is connected to the first interface of the first four-way valve 216; the first interface of the second three-way proportional valve 204 is connected to the third end of the water-cooled condenser 104, and its second interface is connected to the second interface of the first four-way valve 216; the first interface of the fifth water channel tee 215 is connected to the second end of the water-cooled evaporator 101 through the low-pressure side water pump 201, and its second interface is connected to the second interface of the second four-way valve 217; the first interface of the first water channel tee 208 is connected to the third end of the water-cooled condenser 104 through the high-pressure side water pump 218 The fourth end of the water-cooled condenser 104, and its second interface is connected to the first interface of the second four-way valve 217; the first interface of the first three-way valve 205 is connected to the third interface of the second three-way proportional valve 204, and its second interface is connected to the first interface of the second water circuit tee 209; the third interface of the first three-way valve 205 is connected to the third interface of the third water circuit tee 211; one end of the warm air core 206 is connected to the second interface of the second water circuit tee 209, and the other end is connected to the first interface of the second three-way valve 207; the The second interface is connected to the third interface of the first water circuit tee 208, and its third interface is connected to the third interface of the fourth water circuit tee 214; the first interface of the third water circuit tee 211 is connected to the third interface of the first three-way proportional valve 203, and its second interface is connected to one end of the cold air core 212; the first interface of the third three-way valve 213 is connected to the other end of the cold air core 212, and its second interface is connected to the first interface of the fourth water circuit tee 214; the second interface of the fourth water circuit tee 214 is connected to the third interface of the fifth water circuit tee 215. Placing the PTC heater 202 on the passenger compartment water circuit where the low-pressure water-cooled evaporator 101 is located as a driving heat source to provide heat indirectly can not only effectively utilize the low temperature environment to improve the heating efficiency, but also simplify the system structure and reduce costs, while avoiding the influence of traditional heating methods on system performance.

[0046] like Figure 1As shown, the passenger compartment water circuit also includes a stop valve 210, a first interface of the stop valve 210 is connected to the third interface of the second water circuit tee 209, and a second interface thereof is connected to the third interface of the third three-way valve 213. The series connection of the warm air core 206 and the cold air core 212 is achieved through the stop valve 210, which optimizes the heat exchange process, increases the heat exchange area, improves the heat exchange efficiency, reduces energy loss, and ensures the comfort of the temperature inside the vehicle and the response speed of the system.

[0047] like Figure 1 As shown, the battery water circuit includes a battery water pump 301, a battery cold liquid plate 302, a third proportional valve 303 and a sixth water channel tee 304. The first interface of the third proportional valve 303 is connected to the second interface of the sixth water channel tee 304, and its second interface is connected to the third interface of the second four-way valve 217; the first interface of the sixth water channel tee 304 is connected to the fourth interface of the first four-way valve 216, and its third interface is connected to the third interface of the third proportional valve 303 through the battery water pump 301 and the battery cold liquid plate 302 in sequence. The battery water circuit realizes the self-circulation of battery mixed water, so that the battery is always maintained at the working temperature, and the battery temperature can be quickly increased in an extremely low temperature environment, thereby improving the discharge efficiency of the battery and extending the service life of the battery. When working, cold water flows out of the fourth interface of the first four-way valve 216, and hot water flows out of the third interface of the third proportional valve 303. The cold water and hot water are mixed in the sixth water channel tee 304, and then flow out from the third interface of the sixth water channel tee 304 for heat exchange with the battery.

[0048] like Figure 1 As shown, the motor water circuit includes a water tank 401, a motor 402, an on-board charger 403, a fourth three-way valve 404, a low-pressure radiator 405, a low-pressure fan 406 and a seventh water channel tee 407. The first interface of the fourth three-way valve 404 is connected to the first interface of the seventh water channel tee 407, and its second interface is connected to the third interface of the first four-way valve 216 through the on-board charger 403 and the motor 402 in sequence; the third interface of the fourth three-way valve 404 is connected to one end of the low-pressure radiator 405; the second interface of the seventh water channel tee 407 is connected to the fourth interface of the second four-way valve 217, and its third interface is connected to the other end of the low-pressure radiator 405; the water tank 401 is connected to the pipeline between the motor 402 and the first four-way valve 216, and the low-pressure fan 406 is arranged on the low-pressure radiator 405. The setting of the motor water circuit recovers the waste heat of the motor and realizes multiple waste heat recovery modes. At the same time, it improves the heat exchange efficiency of the system in an extremely low temperature environment, reduces the demand for external heat sources, and further reduces energy consumption.

[0049] Specifically, the waste heat of the motor is transferred to the battery through the motor water circuit and the battery water circuit, thereby heating the battery or maintaining its operating temperature; the waste heat of the motor is transferred to the coolant in the water circuit where the low-temperature water-cooled evaporator 101 is located through the heat exchanger. After the coolant is heated, the low-pressure side pressure of the water circuit where the low-temperature water-cooled evaporator 101 is located can be increased, and the higher low-pressure pressure can improve the heat exchange efficiency of the entire system, thereby helping to improve the circulation efficiency of the R290 working fluid in the water circuit where the low-temperature water-cooled evaporator 101 is located.

[0050] The basic thermal management modes in the secondary circuit thermal management system include passenger compartment cooling mode, battery cooling mode, passenger compartment + battery cooling mode, passenger compartment heating mode, passenger compartment heating mode (extremely low temperature), battery heating mode, passenger compartment + battery heating mode, heating (cooling) dehumidification mode 1, heating (cooling) dehumidification mode 2, heating / residual heat defrost mode (preheating / idling), heating / residual heat defrost mode (driving), ventilation defrost mode, waste heat recovery mode 1, waste heat recovery mode 2 and dual heating triangle cycle mode (extremely low temperature).

[0051] like Figure 2 As shown, the flow paths of refrigerant and coolant in passenger compartment cooling mode are as follows:

[0052] Refrigerant circuit: water-cooled evaporator 101 → gas-liquid separator 102 → compressor 103 → water-cooled condenser 104 → main electronic expansion valve 105 → water-cooled evaporator 101.

[0053] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → third water channel tee 211 → cold air core 212 → third three-way valve 213 → stop valve 210 → second water channel tee 209 → warm air core 206 → second three-way valve 207 → fourth water channel tee 214 → fifth water channel tee 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel tee 407 → second four-way valve 217 → first water channel tee 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0054] like Figure 3 As shown, the flow paths of refrigerant and coolant in passenger compartment + battery cooling mode are as follows:

[0055] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0056] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → branch ① and branch ② → fifth water channel tee 215 → low-pressure side water pump 201 → water-cooled evaporator 101; wherein, branch ① is: third water channel tee 211 → cold air core 212 → third three-way valve 213 → stop valve 210 → second water channel tee 209 → warm air core 206 → second three-way valve 207 → fourth water channel tee 214, branch ② is: first four-way valve 216 → sixth water channel tee 304 → battery Water pump 301 → battery cooling liquid plate 302 → third proportional valve 303 → second four-way valve 217, wherein the coolant portion passing through the third proportional valve 303 enters the sixth water channel tee 304 for mixing; water-cooled condenser 104 → second three-way proportional valve 204 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel tee 407 → second four-way valve 217 → first water channel tee 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0057] like Figure 4 As shown, the flow paths of the refrigerant and coolant in the battery cooling mode are as follows:

[0058] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0059] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → sixth water channel three-way 304 → battery water pump 301 → battery cold liquid plate 302 → third proportional valve 303 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101, wherein the coolant portion passing through the third proportional valve 303 enters the sixth water channel three-way 304 for mixing; water-cooled condenser 104 → second three-way proportional valve 204 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0060] like Figure 5 As shown, the flow paths of refrigerant and coolant in passenger compartment heating mode are as follows:

[0061] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0062] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → first three-way valve 205 → third water channel three-way 211 → cold air core 212 → third three-way valve 213 → stop valve 210 → second water channel three-way 209 → warm air core 206 → second three-way valve 207 → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0063] like Figure 6 As shown, the flow paths of refrigerant and coolant in passenger compartment + battery heating mode are as follows:

[0064] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0065] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → branch ① and branch ② → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104; wherein, branch ① is: first three-way valve 205→third water channel tee 211→cold air core 212→third three-way valve 213→stop valve 210→second water channel tee 209→warm air core 206→second three-way valve 207, and branch ② is: first four-way valve 216→sixth water channel tee 304→battery water pump 301→battery cold liquid plate 302→third proportional valve 303→second four-way valve 217, wherein the coolant portion passing through the third proportional valve 303 enters the sixth water channel tee 304 for mixing.

[0066] like Figure 7 As shown, the flow paths of refrigerant and coolant in battery heating mode are as follows:

[0067] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0068] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → first four-way valve 216 → sixth water channel three-way 304 → battery water pump 301 → battery cold liquid plate 302 → third proportional valve 303 → second four-way valve 217 → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104, wherein the coolant portion passing through the third proportional valve 303 enters the sixth water channel three-way 304 for mixing.

[0069] like Figure 8 As shown, the flow paths of the refrigerant and coolant in heating and dehumidification mode 1 are as follows:

[0070] The refrigerant circuit is the same as that in passenger compartment cooling mode.

[0071] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → third water channel tee 211 → cold air core 212 → third three-way valve 213 → fourth water channel tee 214 → fifth water channel tee 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → first three-way valve 205 → second water channel tee 209 → warm air core 206 → second three-way valve 207 → first water channel tee 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0072] like Fig. 9 As shown, the flow paths of refrigerant and coolant in the residual heat defrosting mode are as follows:

[0073] Water circuit: water-cooled condenser 104 → second three-way proportional valve 204 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0074] like Fig.10 As shown, the flow paths of the refrigerant and coolant in waste heat recovery mode 1 are as follows:

[0075] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → seventh water channel three-way 407 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → first three-way valve 205 → third water channel three-way 211 → cold air core 212 → third three-way valve 213 → stop valve 210 → second water channel three-way 209 → warm air core 206 → second three-way valve 207 → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104.

[0076] like Fig.11 As shown in the figure, the flow paths of refrigerant and coolant in the dual heating triangle cycle mode (extremely low temperature) are as follows:

[0077] Refrigerant circuit: water-cooled evaporator 101 → gas-liquid separator 102 → compressor 103 → branch ① and branch ②; wherein, branch ① is: water-cooled condenser 104 → main electronic expansion valve 105 → water-cooled evaporator 101, and branch ② is: side electronic expansion valve 106 → gas-liquid separator 102 → compressor 103.

[0078] Water circuit: water-cooled evaporator 101 → PTC heater 202 → first three-way proportional valve 203 → first four-way valve 216 → motor 402 → on-board charger 403 → fourth three-way valve 404 → low-pressure radiator 405 → seventh water channel three-way 407 → second four-way valve 217 → fifth water channel three-way 215 → low-pressure side water pump 201 → water-cooled evaporator 101; water-cooled condenser 104 → second three-way proportional valve 204 → branch ① and branch ② → first water channel three-way 208 → high-pressure side water pump 218 → water-cooled condenser 104; wherein, branch ① is: first three-way valve 205→third water channel tee 211→cold air core 212→third three-way valve 213→stop valve 210→second water channel tee 209→warm air core 206→second three-way valve 207, and branch ② is: first four-way valve 216→sixth water channel tee 304→battery water pump 301→battery cold liquid plate 302→third proportional valve 303→second four-way valve 217, wherein the coolant portion passing through the third proportional valve 303 enters the sixth water channel tee 304 for mixing.

[0079] Embodiment 2:

[0080] An electric vehicle comprises the secondary circuit thermal management system described in Example 1.

[0081] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary circuit thermal management system, comprising a refrigerant circuit, the refrigerant circuit comprising a water-cooled evaporator (101) and a water-cooled condenser (104), characterized in that: Also includes A passenger compartment water circuit, used for heat exchange in the passenger compartment; The passenger compartment water circuit comprises a first four-way valve (216) and a second four-way valve (217); a first interface of the first four-way valve (216) is connected to a first end of a water-cooled evaporator (101), and a second interface thereof is connected to a third end of a water-cooled condenser (104); a first interface of the second four-way valve (217) is connected to a fourth end of the water-cooled condenser (104), and a second interface thereof is connected to a second end of the water-cooled evaporator (101); A battery water circuit, connected to the fourth interface of the first four-way valve (216) and the third interface of the second four-way valve (217), respectively, for heat exchange of the battery; and a motor water circuit, respectively connected to the third interface of the first four-way valve (216) and the fourth interface of the second four-way valve (217), for heat exchange of the motor; The passenger compartment water circuit further comprises a low-pressure side water pump (201), a PTC heater (202), a first three-way proportional valve (203), a second three-way proportional valve (204), a first three-way valve (205), a warm air core (206), a second three-way valve (207), a first water channel three-way (208), a second water channel three-way (209), a third water channel three-way (211), a cold air core (212), a third three-way valve (213), a fourth water channel three-way (214), a fifth water channel three-way (215) and a high-pressure side water pump (218). The first interface of the first three-way proportional valve (203) is connected to the PTC heater ( The first interface of the water-cooled evaporator (101) is connected to the first end of the water-cooled evaporator (101), and its second interface is connected to the first interface of the first four-way valve (216); the first interface of the second three-way proportional valve (204) is connected to the third end of the water-cooled condenser (104), and its second interface is connected to the second interface of the first four-way valve (216); the first interface of the fifth water channel three-way (215) is connected to the second end of the water-cooled evaporator (101) through the low-pressure side water pump (201), and its second interface is connected to the second interface of the second four-way valve (217); the first interface of the first water channel three-way (208) is connected to the high-pressure side water pump (218) through the high-pressure side water pump (218) The fourth end of the water-cooled condenser (104) is connected, and its second interface is connected to the first interface of the second four-way valve (217); the first interface of the first three-way valve (205) is connected to the third interface of the second three-way proportional valve (204), and its second interface is connected to the first interface of the second water circuit three-way (209); the third interface of the first three-way valve (205) is connected to the third interface of the third water circuit three-way (211); one end of the warm air core (206) is connected to the second interface of the second water circuit three-way (209), and the other end of the warm air core (206) is connected to the first interface of the second three-way valve (207); the second three-way valve (20 The second interface of the water circuit tee (207) is connected to the third interface of the first water circuit tee (208), and the third interface thereof is connected to the third interface of the fourth water circuit tee (214); the first interface of the third water circuit tee (211) is connected to the third interface of the first three-way proportional valve (203), and the second interface thereof is connected to one end of the cold air core (212); the first interface of the third three-way valve (213) is connected to the other end of the cold air core (212), and the second interface thereof is connected to the first interface of the fourth water circuit tee (214); the second interface of the fourth water circuit tee (214) is connected to the third interface of the fifth water circuit tee (215).

2. The secondary circuit thermal management system according to claim 1, characterized in that: The refrigerant circuit further comprises a gas-liquid separator (102), a compressor (103) and a main electronic expansion valve (105); the third end of the water-cooled evaporator (101) is connected to the first end of the water-cooled condenser (104) via the gas-liquid separator (102) and the compressor (103) in sequence, and the fourth end of the water-cooled evaporator is connected to the second end of the water-cooled condenser (104) via the main electronic expansion valve (105).

3. The secondary circuit thermal management system according to claim 2, characterized in that: The refrigerant circuit further comprises a bypass electronic expansion valve (106), and the third end of the water-cooled evaporator (101) is connected to the first end of the water-cooled condenser (104) via the bypass electronic expansion valve (106).

4. The secondary circuit thermal management system according to claim 1, characterized in that: The passenger compartment water circuit also includes a stop valve (210), a first interface of the stop valve (210) being connected to a third interface of the second water circuit tee (209), and a second interface of the stop valve (210) being connected to a third interface of a third three-way valve (213).

5. The secondary circuit thermal management system according to claim 1, characterized in that: The battery water circuit comprises a battery water pump (301), a battery cold liquid plate (302), a third proportional valve (303) and a sixth water channel tee (304); a first interface of the third proportional valve (303) is connected to a second interface of the sixth water channel tee (304), and a second interface thereof is connected to a third interface of the second four-way valve (217); a first interface of the sixth water channel tee (304) is connected to a fourth interface of the first four-way valve (216), and a third interface thereof is connected to a third interface of the third proportional valve (303) via the battery water pump (301) and the battery cold liquid plate (302) in sequence.

6. The secondary circuit thermal management system according to claim 1, characterized in that: The motor water circuit comprises a water tank (401), a motor (402), an on-board charger (403), a fourth three-way valve (404), a low-pressure radiator (405), a low-pressure fan (406) and a seventh water three-way valve (407); a first interface of the fourth three-way valve (404) is connected to a first interface of the seventh water three-way valve (407), and a second interface thereof is connected to a first interface of the first four-way valve (216) via the on-board charger (403) and the motor (402) in sequence. The invention relates to a water tank (401) and a water circuit comprising: a first water circuit (402) and a second water circuit (403) connected to the first water circuit (404); a third water circuit (404) connected to one end of a low-pressure radiator (405); a second water circuit (407) connected to the fourth water circuit (404) of the second four-way valve (217); and a third water circuit (407) connected to the other end of the low-pressure radiator (405); the water tank (401) is connected to the pipeline between the motor (402) and the first four-way valve (216); and the low-pressure fan (406) is arranged on the low-pressure radiator (405).

7. The secondary circuit thermal management system according to claim 1, characterized in that: The refrigerant in the refrigerant circuit is R290.

8. An electric vehicle, characterized in that: It includes the secondary circuit thermal management system described in any one of claims 1-7.

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