Vehicle and cooling system and cooling method thereof

Abstract

The invention provides a vehicle and a cooling system and method thereof, and relates to the technical field of vehicle cooling. Due to the fact that heat exchange between the power battery heat exchange loop and the engine heat exchange loop can be achieved through the first heat exchange module, heat in the power battery heat exchange loop can be exchanged to the engine heat exchange loop through the first heat exchange module, and due to the fact that the engine heat exchange loop comprises a radiator, heat exchange efficiency is improved. Due to the fact that the engine heat exchange loop is arranged in the power battery heat exchange loop, heat in the power battery heat exchange loop can be dissipated through the radiator in the engine heat exchange loop, heat in the power battery pack can be dissipated through the radiator in the engine heat exchange loop, and passive cooling of the power battery pack can be achieved. And the passive cooling of the power battery pack can be realized by utilizing the radiator in the heat exchange loop of the engine, and an independent radiator is not configured, so that the passive cooling of the power battery pack can be realized, and meanwhile, the overall cost performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle cooling, and in particular to a vehicle and a cooling system and a cooling method thereof. Background Art

[0002] During the use of the power battery pack, the discharge of the battery pack and the recovery of kinetic energy will cause a large amount of heat to be generated inside the power battery pack. If the heat is not dissipated in time, the temperature of the power battery pack will be too high, thereby limiting the charge and discharge capacity of the power battery pack. Therefore, when designing new energy vehicle models, a cooling system will be designed in the power battery pack. At present, the mainstream battery cooling method is liquid cooling.

[0003] Liquid cooling is divided into active cooling and passive cooling. Active cooling means cooling the coolant through the refrigerant of the air conditioning system, and then letting the coolant cool the power battery pack. Passive cooling means dissipating the heat of the power battery pack carried by the coolant in the power battery pack circuit through the radiator.

[0004] At present, the power battery pack of hybrid vehicles is relatively small. If a separate passive cooling system is designed for it, the overall cost-effectiveness of the vehicle will be reduced, thereby reducing the vehicle's product competitiveness.

[0005] Therefore, how to improve the overall cost-effectiveness of the vehicle while achieving passive cooling of the power battery pack is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of this, the present invention provides a vehicle and a cooling system and a cooling method thereof, so as to improve the overall cost performance of the vehicle while realizing passive cooling of a power battery pack.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] In a first aspect, the present application provides a cooling system for a vehicle, comprising: a power battery heat exchange circuit, an engine heat exchange circuit and a first heat exchange module; wherein:

[0009] The first heat exchange module is used to realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit;

[0010] The engine heat exchange circuit includes a radiator.

[0011] Optionally, the first heat exchange module includes: a second heat exchange module and a first heat exchange circuit in the air conditioning and heating system in the vehicle; wherein:

[0012] The first heat exchange circuit and the engine heat exchange circuit share at least a vehicle engine;

[0013] The first side of the second heat exchange module is disposed in the first heat exchange loop, and the second side of the second heat exchange module is disposed in the power battery heat exchange loop.

[0014] Optionally, the second heat exchange module comprises: a first heat exchanger, a first three-way electric control valve and a first three-way pipe; wherein:

[0015] The first outlet of the first three-way electrically controlled valve is connected to the first inlet of the first three-way pipe, and the second outlet of the first three-way electrically controlled valve is connected to the second inlet of the first three-way pipe through the first side of the first heat exchanger;

[0016] The inlet of the first three-way electric control valve serves as the inlet of the first side of the second heat exchange module, and the outlet of the first three-way pipe serves as the outlet of the first side of the second heat exchange module;

[0017] The inlet of the second side of the first heat exchanger serves as the inlet of the second side of the second heat exchange module, and the outlet of the second side of the first heat exchanger serves as the outlet of the second side of the second heat exchange module.

[0018] Optionally, the air conditioning and heating system comprises: an air conditioning heat source, a heating water pump, a second three-way pipe, a second three-way electric control valve, the vehicle engine, and an engine water pump; wherein:

[0019] The air conditioning heat source, the second three-way electric control valve, the vehicle engine, the engine water pump, the second three-way pipe, and the warm air water pump are connected in series to form the first heat exchange circuit;

[0020] The air conditioning heat source, the second three-way electric control valve, the second three-way pipe, and the warm air water pump are connected in series to form a second heat exchange circuit in the air conditioning warm air system.

[0021] Optionally, the power battery heat exchange circuit includes: a power battery pack, a second heat exchanger and a battery water pump; wherein:

[0022] The power battery pack, the first side of the second heat exchanger, and the battery water pump are connected in series to form the power battery heat exchange circuit;

[0023] The second side of the second heat exchanger is connected to the air conditioning cooling system in the vehicle.

[0024] Optionally, the engine heat exchange circuit includes: a vehicle engine, the radiator, an engine water pump and a thermostat; wherein:

[0025] The vehicle engine, the radiator, the engine water pump, and the thermostat are connected in series to form the engine heat exchange circuit.

[0026] A second aspect of the present application provides a vehicle cooling method, which is applied to a vehicle controller in the vehicle, wherein the cooling system of the vehicle as described in any one of the first aspects of the present application is controlled by the vehicle controller, and the cooling method comprises:

[0027] Determining whether the vehicle is in a driving state, a door-open high-voltage state, or a charging state;

[0028] If the vehicle is in a driving state, a door-open high-voltage state, or a charging state, passive cooling is performed on the power battery pack in the vehicle if the passive cooling conditions are met;

[0029] Passively cooling the power battery pack in the vehicle includes: operating a power battery heat exchange circuit and an engine heat exchange circuit in the cooling system, operating a radiator fan in the engine heat exchange circuit, and using a first heat exchange module in the cooling system to exchange heat between the power battery heat exchange circuit and the engine heat exchange circuit;

[0030] Among them, the passive cooling conditions include: the maximum temperature of the power battery pack is within a preset temperature range, the air-conditioning cold source in the air-conditioning cold air system in the vehicle is not turned on, and the first heat exchange module in the cooling system can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit.

[0031] Optionally, the first heat exchange module includes: a second heat exchange module and a first heat exchange circuit in the air conditioning and heating system in the vehicle;

[0032] The first heat exchange module can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit, including: the speed of the vehicle engine is less than or equal to a preset speed, and the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is greater than a preset temperature difference, and the air-conditioning heat source in the air-conditioning heating system is not turned on.

[0033] Optionally, after passively cooling the power battery pack in the vehicle, the method further includes:

[0034] During the process of passively cooling the power battery pack, periodically or in real time determining whether the passive cooling condition is not met;

[0035] If the passive cooling condition is not met, passive cooling of the power battery pack is stopped.

[0036] Optionally, after passively cooling the power battery pack in the vehicle, the method further includes:

[0037] During the process of passively cooling the power battery pack, periodically or in real time determining whether at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails;

[0038] If at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails, passive cooling of the power battery pack is stopped.

[0039] Optionally, the power battery heat exchange circuit includes a second heat exchanger;

[0040] If the vehicle is in a driving state, a door-open high-voltage state, or a charging state, the power battery pack is actively cooled when the maximum temperature of the power battery pack is greater than the maximum value of the preset temperature range;

[0041] Actively cooling the power battery pack includes: keeping the power battery heat exchange circuit and the air conditioning cooling system in operation.

[0042] The third aspect of the present application provides a vehicle, comprising: a vehicle controller and a cooling system of the vehicle as described in any one of the first aspects of the present application; wherein:

[0043] The vehicle controller is used to execute the vehicle cooling method as described in any one of the second aspects of the present application.

[0044] It can be seen from the above technical solution that the present invention provides a cooling system for a vehicle. In the cooling system, since the first heat exchange module can realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit, the heat in the power battery heat exchange circuit can be exchanged to the engine heat exchange circuit through the first heat exchange module, and since the engine heat exchange circuit includes a radiator, the heat in the power battery heat exchange circuit can be dissipated by using the radiator in the engine heat exchange circuit, and since the heat in the power battery heat exchange circuit comes from the power battery pack of the vehicle, the heat in the power battery pack can be dissipated by using the radiator in the engine heat exchange circuit, so the present application can realize passive cooling of the power battery pack. Since the present application can realize passive cooling of the power battery pack by using the radiator in the engine heat exchange circuit without configuring a separate radiator for the power battery pack, the present application can improve the overall cost performance of the vehicle while realizing passive cooling of the power battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 A schematic structural diagram of a specific implementation of a cooling system for a vehicle provided in an embodiment of the present application;

[0047] Figure 2 A schematic flow chart of a first specific implementation of a vehicle cooling method provided in an embodiment of the present application;

[0048] Figure 3 A schematic flow chart of a second specific implementation of a vehicle cooling method provided in an embodiment of the present application;

[0049] Figure 4 A schematic flow chart of a third specific implementation of a vehicle cooling method provided in an embodiment of the present application;

[0050] Figure 5 A schematic flow chart of a fourth specific implementation of a vehicle cooling method provided in an embodiment of the present application;

[0051] Figure 6 A schematic flow chart of a fifth specific implementation of a vehicle cooling method provided in an embodiment of the present application;

[0052] Figure 7 A flowchart of a specific implementation of step S130 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0055] In order to achieve passive cooling of the power battery pack and improve the overall cost performance of the vehicle, another embodiment of the present application provides a cooling system for the vehicle, the specific structure of which can be seen in Figure 1 , specifically including: a power battery heat exchange circuit, an engine heat exchange circuit and a first heat exchange module.

[0056] The first heat exchange module is used to realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit.

[0057] Among them, the engine heat exchange circuit includes a radiator.

[0058] In this embodiment, since the first heat exchange module can realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit, the heat in the power battery heat exchange circuit can be exchanged to the engine heat exchange circuit through the first heat exchange module, and since the engine heat exchange circuit includes a radiator, the heat in the power battery heat exchange circuit can be dissipated by using the radiator in the engine heat exchange circuit, and since the heat in the power battery heat exchange circuit comes from the power battery pack of the vehicle, the heat in the power battery pack can be dissipated by using the radiator in the engine heat exchange circuit, so the present application can realize passive cooling of the power battery pack. Since the present application can realize passive cooling of the power battery pack by using the radiator in the engine heat exchange circuit without configuring a separate radiator for the power battery pack, the present application can realize passive cooling of the power battery pack while improving the overall cost performance of the vehicle.

[0059] In addition, since the power consumption of active cooling is at the KW level, while the power consumption of passive cooling is at the W level, the power consumption of passive cooling is lower. Since the present application realizes passive cooling of the power battery pack, the present application can reduce the power consumption when cooling the power battery pack, that is, it can achieve energy saving and also improve the endurance of the vehicle.

[0060] Another embodiment of the present application provides a specific implementation of the engine heat exchange circuit. The specific structure can be found in Figure 1 This embodiment specifically includes: a vehicle engine 01, a radiator 02, an engine water pump 03 and a thermostat 04. The connection relationship between the components is as follows:

[0061] The vehicle engine 01, the radiator 02, the engine water pump 03, and the thermostat 04 are connected in series to form an engine heat exchange circuit.

[0062] In a specific example, the outlet of the vehicle engine 01 is connected to the inlet of the thermostat 04, the outlet of the thermostat 04 is connected to the inlet of the radiator 02, the outlet of the radiator 02 is connected to the inlet of the engine water pump 03, and the outlet of the engine water pump 03 is connected to the inlet of the vehicle engine 01.

[0063] The above example only shows a specific connection method of the vehicle engine 01, radiator 02, engine water pump 03, thermostat 04. In actual applications, including but not limited to this, no specific limitation is made here and all are within the scope of protection of this application.

[0064] It should be noted that this implementation of the engine heat exchange circuit is already very mature in the prior art, and its working principle will not be described in detail here.

[0065] The above is only a specific implementation of the engine heat exchange circuit. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation and is within the protection scope of this application.

[0066] Another embodiment of the present application provides a specific implementation of a power battery heat exchange circuit. The specific structure can be found in Figure 1 This embodiment specifically includes: a power battery pack 05, a second heat exchanger 06 and a battery water pump 07. The connection relationship between the components is as follows:

[0067] The power battery pack 05, the first side of the second heat exchanger 06, and the battery water pump 07 are connected in series to form a power battery heat exchange loop, and the second side of the second heat exchanger 06 is connected to the air conditioning cooling system in the vehicle.

[0068] The air conditioning cooling system refers to the system in the air conditioning used to cool the vehicle's passenger compartment.

[0069] In a specific example, the outlet of the power battery pack 05 is connected to the inlet of the battery water pump 07 , the outlet of the battery water pump 07 is connected to the inlet of the first side of the second heat exchanger 06 , and the outlet of the first side of the second heat exchanger 06 is connected to the inlet of the power battery pack 05 .

[0070] The above example only shows a specific connection method of the power battery pack 05, the second heat exchanger 06 and the battery water pump 07. In practical applications, including but not limited to this, no specific limitation is made here and all are within the scope of protection of this application.

[0071] It should be noted that this implementation of the power battery heat exchange circuit is already very mature in the prior art, and its working principle will not be described in detail here.

[0072] Since the first side of the second heat exchanger 06 is arranged in the power battery heat exchange circuit, and the second side of the second heat exchanger 06 is connected to the air conditioning and cooling system in the vehicle, the second heat exchanger 06 can be used to realize heat exchange between the air conditioning and cooling system and the power battery heat exchange circuit, so that the air conditioning and cooling system can be used to cool the power battery pack 05, that is, active cooling of the power battery pack 05 can be realized, so the vehicle has an active cooling function for the power battery pack 05.

[0073] The above is only a specific implementation of the power battery heat exchange circuit. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0074] Another embodiment of the present application provides a specific implementation of the first heat exchange module. The specific structure can be found in Figure 1 , which specifically includes: a second heat exchange module and a first heat exchange circuit in the air conditioning and heating system of the vehicle.

[0075] The first heat exchange circuit and the engine heat exchange circuit at least share the vehicle engine 01. It should be noted that the air conditioning heating system refers to a system in the air conditioning system for heating the passenger compartment of the vehicle.

[0076] The first side of the second heat exchange module is arranged in the above-mentioned first heat exchange loop, and the second side of the second heat exchange module is arranged in the power battery heat exchange loop.

[0077] For example, Figure 1 Taking the power battery heat exchange circuit in as an example, the second side of the second heat exchange module can be arranged between the outlet of the battery water pump 07 and the inlet of the first side of the second heat exchanger 06.

[0078] Since the first side of the second heat exchange module is arranged in the above-mentioned first heat exchange circuit, and the second side of the second heat exchange module is arranged in the power battery heat exchange circuit, the heat exchange between the power battery heat exchange circuit and the above-mentioned first heat exchange circuit can be realized through the second heat exchange module. In addition, since the above-mentioned first heat exchange circuit and the engine heat exchange circuit at least share the vehicle engine 01, that is, the above-mentioned first heat exchange circuit and the engine heat exchange circuit can realize mixed liquid, heat transfer can be carried out between the above-mentioned first heat exchange circuit and the engine heat exchange circuit, that is, the heat in the above-mentioned first heat exchange circuit can enter the engine heat exchange circuit or the heat in the engine heat exchange circuit can enter the above-mentioned first heat exchange circuit. In summary, the first heat exchange module can realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit.

[0079] In this embodiment, since heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit is achieved through the second heat exchange module and the above-mentioned first heat exchange circuit, the above-mentioned first heat exchange circuit can also be used to dissipate the heat in the power battery heat exchange circuit, that is, the heat of the power battery pack 05 can also be dissipated. Therefore, the above-mentioned first heat exchange circuit can also be used to achieve passive cooling of the power battery pack 05, thereby improving the cooling capacity of the passive cooling of the power battery pack 05.

[0080] The above is only a specific implementation of the first heat exchange module. In practical applications, it includes but is not limited to this. For example, the first heat exchange module includes a second heat exchange module, the first side of the second heat exchange module is arranged in the engine heat exchange circuit, and the second side of the second heat exchange module is arranged in the power battery heat exchange circuit. No specific limitation is made here, and it may be determined according to the specific circumstances, and all are within the protection scope of this application.

[0081] Another embodiment of the present application provides a specific implementation of the second heat exchange module. The specific structure can be found in Figure 1 This embodiment specifically includes: a first heat exchanger 08, a first three-way electric control valve 09 and a first three-way pipe 10. The connection relationship between the components is as follows:

[0082] The first outlet of the first three-way electrically controlled valve 09 is connected to the first inlet of the first three-way pipe 10 , and the second outlet of the first three-way electrically controlled valve 09 is connected to the second inlet of the first three-way pipe 10 through the first side of the first heat exchanger 08 .

[0083] The inlet of the first three-way electric control valve 09 serves as the inlet of the first side of the second heat exchange module, and the outlet of the first three-way pipe serves as the outlet of the first side of the second heat exchange module.

[0084] The inlet of the second side of the first heat exchanger 08 serves as the inlet of the second side of the second heat exchange module, and the outlet of the second side of the first heat exchanger 08 serves as the outlet of the second side of the second heat exchange module.

[0085] For example, Figure 1 Taking the power battery heat exchange circuit and the second heat exchange module in as an example, the inlet of the second side of the first heat exchanger 08 can be connected to the outlet of the battery water pump 07, and the outlet of the second side of the first heat exchanger 08 is connected to the inlet of the first side of the second heat exchanger 06.

[0086] When the first outlet of the first three-way electrically controlled valve 09 is opened and the second outlet is closed, a passage is formed in the pipeline between the first outlet of the first three-way electrically controlled valve 09 and the first inlet of the first three-way pipe 10; when the first outlet of the first three-way electrically controlled valve 09 is closed and the second outlet is opened, a passage is formed in the pipeline between the second outlet of the first three-way electrically controlled valve 09 and the second inlet of the first three-way pipe 10.

[0087] The above is only a specific implementation of the second heat exchange module. In practical applications, including but not limited to this, for example, the position of the first three-way electric control valve 09 is swapped with the position of the first three-way pipe 10. No specific limitation is made here and it can be determined according to the specific situation, which is within the protection scope of this application.

[0088] Another embodiment of the present application provides a specific implementation of the air conditioning and heating system, which is applicable to the case where the first heat exchange circuit and the engine heat exchange circuit share the vehicle engine 01 and the engine water pump 03. The specific structure of this implementation can be found in Figure 1 , which specifically includes: air conditioning heat source 11, warm air water pump 12, second three-way pipe 13, second three-way electric control valve 14, vehicle engine 01, engine water pump 03. The connection relationship between the components is as follows:

[0089] The air conditioning heat source 11, the second three-way electric control valve 14, the vehicle engine 01, the second three-way pipe 13, and the warm air water pump 12 are connected in series to form the above-mentioned first heat exchange circuit. Among them, the air conditioning heat source 11 refers to a device that can heat in the air conditioner, and this device is related to the type of air conditioner. In practical applications, the air conditioner can be a heat pump air conditioner or a common air conditioner. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific situation. If the air conditioner is a common air conditioner, the specific structure of the air conditioning heat source 11 is as follows Figure 1 As shown, it includes an air conditioning box 21 and a heater 22, and the air conditioning box 21 includes a blower 23 and a warm air core 24. Since this embodiment of the air conditioning heat source 11 is already very mature in the prior art, it will not be described in detail here.

[0090] In a specific example, if Figure 1As shown, the outlet of the air-conditioning heat source 11 is connected to the inlet of the second three-way electric-controlled valve 14, the first outlet of the second three-way electric-controlled valve 14 is connected to the inlet of the engine water pump 03, the outlet of the engine water pump 03 is connected to the inlet of the vehicle engine 01, the outlet of the vehicle engine 01 is connected to the first inlet of the second three-way pipe 13, the outlet of the second three-way pipe 13 is connected to the inlet of the warm air water pump 12, the outlet of the warm air water pump 12 is connected to the inlet of the air-conditioning heat source 11, and the formed circuit is the above-mentioned first heat exchange circuit.

[0091] The above example only shows a specific connection method of the air conditioning heat source 11, the second three-way electric control valve 14, the vehicle engine 01, the second three-way pipe 13, and the heater water pump 12. In actual applications, including but not limited to this, no specific limitation is made here and they are all within the protection scope of this application.

[0092] The air conditioning heat source 11, the second three-way electric control valve 14, the second three-way pipe 13, and the warm air water pump 12 are connected in series to form a second heat exchange loop in the air conditioning warm air system.

[0093] In a specific example, if Figure 1 As shown, the outlet of the air-conditioning heat source 11 is connected to the inlet of the second three-way electric-controlled valve 14, the second outlet of the second three-way electric-controlled valve 14 is connected to the second inlet of the second three-way pipe 13, the outlet of the second three-way pipe 13 is connected to the inlet of the warm air water pump 12, and the outlet of the warm air water pump 12 is connected to the inlet of the air-conditioning heat source 11, and the formed loop is the above-mentioned second heat exchange loop.

[0094] The above example only shows a specific connection method of the air conditioning heat source 11, the second three-way electric control valve 14, the second three-way pipe 13, and the warm air water pump 12. In practical applications, including but not limited to this, no specific limitation is made here and all are within the protection scope of this application.

[0095] For example, Figure 1 Taking the air conditioning and heating system in the embodiment as an example, the first side of the second heat exchange module can be arranged between the outlet of the air conditioning heat source 11 and the inlet of the second three-way electric control valve 14.

[0096] For example, Figure 1 Taking the air conditioning heating system and the second heat exchange module as an example, the inlet of the first three-way electric control valve 09 is connected to the outlet of the air conditioning heat source 11, and the outlet of the first three-way pipe 10 is connected to the inlet of the second three-way electric control valve 14.

[0097] It should be noted that this implementation of the air conditioning and heating system is already very mature in the prior art, and its working principle will not be described in detail here.

[0098] The above is only a specific implementation of the air conditioning and heating system. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the scope of protection of this application.

[0099] Another embodiment of the present application provides a vehicle cooling method, which is applied to a vehicle controller in a vehicle. The cooling system of the vehicle provided by any of the above embodiments is controlled by the vehicle controller. The specific process of the cooling method is as follows: Figure 2 As shown, the specific steps include:

[0100] S110, determining whether the vehicle is in a driving state, a door-open high-voltage state, or a charging state.

[0101] If the vehicle is in the driving state, the door-open high-voltage state or the charging state, execute step S120; if the vehicle is not in the driving state, the door-open high-voltage state or the charging state, return to execute step S110.

[0102] The vehicle being in a driving state means that the vehicle is drivable, or the vehicle engine can be started and the vehicle is not drivable. The drivable vehicle can be understood as the vehicle being able to drive, that is, whether the vehicle drives depends on whether a driving command is received. Conversely, the non-drivable vehicle can be understood as the vehicle being unable to drive. In addition, the vehicle engine can be started can be understood as the vehicle engine being able to start, that is, whether the vehicle engine starts depends on whether an engine start command is received.

[0103] The vehicle is in a door-opening high-voltage state, which means: the power battery pack is high-voltage, the vehicle cannot be driven, and the vehicle engine cannot be started. The high voltage on the power battery pack is very common in the prior art, and it will not be described in detail here. The vehicle cannot be driven and the vehicle engine cannot be started have been described in detail above, and will not be repeated here.

[0104] It should be noted that it is very common in the prior art that a vehicle is in a charging state, and will not be described in detail here.

[0105] S120: Determine whether passive cooling conditions are met.

[0106] If the passive cooling condition is met, step S130 is executed; if the passive cooling condition is not met, the process returns to step S110.

[0107] Among them, the passive cooling conditions include: the maximum temperature of the power battery pack in the vehicle is within a preset temperature range, the air-conditioning cold source in the air-conditioning cooling system in the vehicle is not turned on, and the first heat exchange module in the above-mentioned cooling system can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit.

[0108] It should be noted that the maximum temperature of the power battery pack is fed back by the power battery pack controller to the vehicle controller.

[0109] If the maximum temperature of the power battery pack is within the preset temperature range, it indicates that the power battery pack needs to be passively cooled, and the temperature of the power battery pack meets the temperature requirements for passive cooling. On the contrary, if the maximum temperature of the power battery pack is not within the preset temperature range, it indicates that the power battery pack does not need to be passively cooled, or the temperature of the power battery pack does not meet the temperature requirements for passive cooling.

[0110] The preset temperature range is set according to the actual situation of the power battery pack and is not limited here. Usually, the preset temperature range is 25℃~38℃. It should be noted that the preset temperature range does not include the boundary value. Taking the preset temperature range of 25℃~38℃ as an example, the preset temperature range does not include 25℃ and 38℃.

[0111] Since the maximum temperature of the power battery pack is within the preset temperature range, it indicates that the power battery pack needs to be passively cooled and the temperature of the power battery pack meets the temperature requirements for passive cooling. Therefore, the maximum temperature of the power battery pack needs to be within the preset temperature range as one of the conditions for passive cooling.

[0112] The air conditioning cold source in the air conditioning cold air system is not turned on, which means that the air conditioning cold source is not in working condition.

[0113] Because if the air-conditioning cold source is in working condition, the ambient temperature of the radiator in the engine heat exchange circuit will increase, which may affect the heat dissipation efficiency of the radiator in the engine heat exchange circuit, that is, it may affect the heat dissipation in the engine heat exchange circuit, and thus may affect the exchange between the engine heat exchange circuit and the power battery heat exchange circuit, that is, it may affect the heat dissipation in the power battery pack. Therefore, it is necessary to turn off the air-conditioning cold air system as one of the conditions for passive cooling.

[0114] The first heat exchange module can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit, which can be understood as: the first heat exchange module has the ability to exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit.

[0115] If the above-mentioned first heat exchange module is unable to exchange the heat of the power battery heat exchange circuit to the engine heat exchange circuit, it may affect the heat dissipation of the power battery heat exchange circuit, and thus may affect the heat dissipation in the power battery pack. Therefore, it is necessary for the above-mentioned first heat exchange module to be able to exchange the heat of the power battery heat exchange circuit to the engine heat exchange circuit as one of the conditions for passive cooling.

[0116] S130. Passively cool the power battery pack in the vehicle.

[0117] Passive cooling of a power battery pack in a vehicle includes: operating a power battery heat exchange circuit and an engine heat exchange circuit in the above-mentioned cooling system, operating a fan of a radiator in the engine heat exchange circuit, and utilizing a first heat exchange module in the above-mentioned cooling system to exchange heat between the power battery heat exchange circuit and the engine heat exchange circuit to cool the power battery pack in the vehicle.

[0118] To put the power battery heat exchange circuit and the engine heat exchange circuit into operation means to make the heat exchange medium in the power battery heat exchange circuit and the engine heat exchange circuit flow.

[0119] In this embodiment, since the power battery heat exchange circuit and the engine heat exchange circuit are both in operation, the heat exchange medium in the power battery heat exchange circuit and the engine heat exchange circuit flows. Since the above-mentioned first heat exchange module can exchange the heat of the power battery heat exchange circuit to the engine heat exchange circuit, the first heat exchange module in the above-mentioned cooling system is used to exchange heat between the power battery heat exchange circuit and the engine heat exchange circuit, and the heat of the power battery heat exchange circuit can be exchanged to the engine heat exchange circuit. In summary, the heat in the power battery pack can be exchanged to the radiator in the engine heat exchange circuit.

[0120] Since the radiator fan in the engine heat exchange circuit is in operation and the air conditioning cooling system is not turned on, the heat in the radiator can be dissipated and the heat dissipation efficiency of the radiator is less affected. Therefore, the heat in the power battery pack can be dissipated by the radiator, thereby achieving passive cooling of the power battery pack.

[0121] Another embodiment of the present application provides another implementation of a cooling method for a vehicle, and this implementation differs from the previous implementation in that:

[0122] In this embodiment, the first heat exchange module includes the second heat exchange module and the first heat exchange circuit in the air conditioning and heating system of the vehicle, that is, the first heat exchange module adopts Figure 1 In the implementation mode, the first heat exchange module can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit, including: the speed of the vehicle engine is less than or equal to the preset speed, and the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is greater than the preset temperature difference, and the air conditioning heat source in the air conditioning heating system is not turned on.

[0123] It should be noted that the rotation speed of the vehicle engine and the temperature of the heat exchange medium of the vehicle engine are fed back to the vehicle controller by the engine controller.

[0124] If the speed of the vehicle engine is less than or equal to the preset speed, it indicates that the speed of the vehicle engine is very low. On the contrary, if the speed of the vehicle engine is greater than the preset speed, it indicates that the speed of the vehicle engine is not very low. In practical applications, the preset speed is set according to the actual conditions of the engine and the power battery pack, and is not limited here. Normally, the preset speed is set to 0, that is, the speed of the vehicle engine is less than or equal to the preset speed, indicating that the vehicle engine stops running.

[0125] If the speed of the vehicle engine is greater than the preset speed, that is, the speed of the vehicle engine is not very small, the heat generated by the vehicle engine is not very small, so the temperature of the heat exchange medium of the vehicle engine may be higher than the maximum temperature of the power battery pack, which may cause the first heat exchange module to be unable to exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit. Therefore, the first heat exchange module can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit, which requires the speed of the vehicle engine to be less than or equal to the preset speed.

[0126] If the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is greater than the preset temperature difference, it means that the maximum temperature of the power battery pack is greater than the temperature of the heat exchange medium of the vehicle engine and the difference between the two is large. Conversely, if the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is less than or equal to the preset temperature difference, it means that the maximum temperature of the power battery pack is greater than the temperature of the heat exchange medium of the vehicle engine and the difference between the two is not large. In practical applications, the preset temperature difference is set according to the actual heat dissipation requirements and is not specifically limited here. Normally, the preset temperature difference is set to 10°C.

[0127] If the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is less than or equal to the preset temperature difference, that is, the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine are not very different, it may cause the heat exchange amount between the power battery heat exchange circuit and the engine heat exchange circuit to be very small, so the heat taken away from the power battery pack may be very small, and thus the power battery pack cannot be cooled. Therefore, the first heat exchange module can exchange the heat of the power battery heat exchange circuit to the engine heat exchange circuit, which requires that the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is greater than the preset temperature difference.

[0128] The air conditioning heat source in the air conditioning heating system is not turned on, which means that the air conditioning heat source is not in working condition.

[0129] Since if the air-conditioning heat source is in working condition, the temperature of the heat exchange medium in the above-mentioned first heat exchange circuit increases, it may affect the heat exchange between the second heat exchange module and the above-mentioned first heat exchange circuit, and thus may affect the heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit. Therefore, the first heat exchange module can exchange the heat of the power battery heat exchange circuit to the engine heat exchange circuit, which requires that the heating system is not turned on.

[0130] The above is merely another implementation of the vehicle cooling method, which is not specifically limited here and can be determined according to specific circumstances.

[0131] Another embodiment of the present application provides another implementation of a cooling method for a vehicle, and this implementation differs from the previous implementation in that:

[0132] In this embodiment, the entire vehicle has a temperature equalization function for the power battery pack, and the passive cooling condition, in addition to the above conditions, also includes that the temperature equalization function is not turned on or triggered.

[0133] The above-mentioned temperature averaging function is not turned on, which means that the above-mentioned temperature averaging function cannot be used normally. The above-mentioned temperature averaging function is not triggered, which means that the conditions for triggering the above-mentioned temperature averaging function have not been met.

[0134] It should be noted that the above-mentioned temperature equalization function is already very mature in the prior art, and will not be described in detail here. In addition, the conditions for triggering the above-mentioned temperature equalization function are already very mature in the prior art, and will not be described in detail here.

[0135] Since if the above-mentioned temperature equalization function is turned on, the first heat exchange module cannot realize the heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit, it may affect the heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit. Therefore, in addition to the above-mentioned conditions, the passive cooling conditions also include that the above-mentioned temperature equalization function is not turned on or triggered.

[0136] The above is merely another implementation of the vehicle cooling method, which is not specifically limited here and can be determined according to specific circumstances.

[0137] Another embodiment of the present application provides another implementation of a cooling method for a vehicle, and the specific process is as follows: Figure 3 As shown, this embodiment further includes the following steps before step S130 in the above embodiment:

[0138] S210: Determine whether the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module are all free of failures.

[0139] If the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module are not faulty, step S130 is executed; if at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module is faulty, the cooling method is stopped.

[0140] In this embodiment, before executing step S130, it is first determined whether the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module are all free of faults. If the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module are all free of faults, step S130 is executed, thereby improving the reliability of passive cooling of the power battery pack.

[0141] Another embodiment of the present application provides another implementation of the vehicle cooling method, and its specific process can be found in Figure 4 ( Figure 4 Only in Figure 3 This embodiment further includes the following steps after step S130 in the above embodiment:

[0142] S310: During the process of passively cooling the power battery pack, periodically or in real time determine whether a passive cooling condition is not met.

[0143] If the passive cooling condition is not met, step S320 is executed; if the passive cooling condition is met, the process returns to step S130.

[0144] S320: Stop passive cooling of the power battery pack.

[0145] Stop passive cooling of the power battery pack, including: stopping the power battery heat exchange circuit and the engine heat exchange circuit from being in operation, stopping the fan of the radiator in the engine heat exchange circuit from being in operation, and stopping heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit.

[0146] It should be noted that making the power battery heat exchange circuit and the engine heat exchange circuit not in operation is the opposite of making the power battery heat exchange circuit and the engine heat exchange circuit in operation, which can be obtained through deduction and will not be repeated here.

[0147] In the present embodiment, since it is determined periodically or in real time whether the passive cooling conditions are met during the cooling of the power battery pack, the passive cooling of the power battery pack can be stopped in time, thereby avoiding excessive cooling of the power battery pack to a certain extent. In addition, it can also avoid, to a certain extent, forcing the power battery pack to be passively cooled when the power battery pack cannot be passively cooled.

[0148] Another embodiment of the present application provides another implementation of the vehicle cooling method, and its specific process can be found in Figure 5 ( Figure 5 Only in Figure 3 This embodiment further includes the following steps after step S130 in the above embodiment:

[0149] S410: During the process of passively cooling the power battery pack, periodically or in real time determine whether at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails.

[0150] If at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails, step S420 is executed; if none of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails, the process returns to step S130.

[0151] S420: Stop passive cooling of the power battery pack.

[0152] Stop passive cooling of the power battery pack, including: stopping the power battery heat exchange circuit and the engine heat exchange circuit from being in operation, stopping the fan of the radiator in the engine heat exchange circuit from being in operation, and stopping heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit.

[0153] It should be noted that making the power battery heat exchange circuit and the engine heat exchange circuit not in operation is the opposite of making the power battery heat exchange circuit and the engine heat exchange circuit in operation, which can be obtained through deduction and will not be repeated here.

[0154] In this embodiment, since it is periodically or in real time determined whether at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails during the cooling of the power battery pack, the passive cooling of the power battery pack can be stopped in time, thereby avoiding to a certain extent the forced passive cooling of the power battery pack when it is determined that at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails.

[0155] It should be noted that if both step S310 and step S410 are included after step S130, step S310 and step S410 are executed simultaneously.

[0156] Another embodiment of the present application provides another implementation of the vehicle cooling method, which is applicable to the case where the power battery heat exchange circuit includes a second heat exchanger, that is, the vehicle has an active cooling function for the power battery pack. The specific process of this implementation can be found in Figure 6 ( Figure 6 Only in Figure 3This embodiment, when the vehicle in the above embodiment is in a driving state, a door-opening high-voltage state or a charging state, further includes the following steps:

[0157] S510: Determine whether the maximum temperature of the power battery pack is greater than the maximum value of a preset temperature range.

[0158] If the maximum temperature of the power battery pack is greater than the maximum value of the preset temperature range, step S520 is executed; if the maximum temperature of the power battery pack is not greater than the maximum value of the preset temperature range, the process returns to step S110.

[0159] S520. Actively cool the power battery pack.

[0160] Actively cooling the power battery pack includes: using the first heat exchange module to prohibit the power battery heat exchange circuit from exchanging heat with the engine heat exchange circuit, and keeping the power battery heat exchange circuit and the air conditioning cooling system in operation.

[0161] Putting the air conditioning cooling system into operation means: putting the air conditioning cold source into operation and making the heat exchange medium in the heat exchange circuit in the air conditioning cooling system flow.

[0162] In this embodiment, since the first heat exchange module is used to prohibit the power battery heat exchange circuit from exchanging heat with the engine heat exchange circuit, and the power battery heat exchange circuit and the air-conditioning cooling system are both in operation, the second heat exchanger can be used to achieve heat exchange between the air-conditioning cooling system and the power battery heat exchange circuit, thereby using the air-conditioning cooling system to cool the power battery pack, thereby achieving active cooling of the power battery pack.

[0163] Since the power battery pack is actively cooled when the maximum temperature of the power battery pack is greater than the maximum value of the preset temperature range, the power battery pack is passively cooled when the temperature is low, and is actively cooled when the temperature is high. This delays the time to enter active cooling, thereby reducing the power consumption when cooling the power battery pack, thus achieving energy saving and improving the vehicle's endurance.

[0164] Another embodiment of the present application provides a specific implementation of step S130, which is applicable to the following situations: the first heat exchange module includes the second heat exchange module and the first heat exchange circuit in the air conditioning and heating system of the vehicle, the second heat exchange module includes the first three-way electric control valve and the first heat exchanger, the air conditioning and heating system includes a heating water pump and a second three-way electric control valve, the engine heat exchange circuit includes a thermostat, an engine water pump and a radiator, and the power battery heat exchange circuit includes a battery water pump. In other words, this implementation is applicable to the following situations: Figure 1 The specific process of this embodiment is as follows: Figure 7 As shown, the specific steps include:

[0165] S610: Control the engine water pump to be in running state.

[0166] In practical applications, the engine water pump is controlled by an engine controller, and the engine controller is communicated with the vehicle controller, so the vehicle controller indirectly controls the engine water pump.

[0167] In a specific example, controlling the engine water pump to be in a running state may be specifically as follows:

[0168] (1) The vehicle controller determines the duty cycle of the engine water pump and sends it to the engine controller.

[0169] (2) The engine controller controls the engine water pump to operate at this duty cycle.

[0170] Typically, the duty cycle is set to 30%.

[0171] The above example only shows one implementation of S610, which is not limited to the actual application and is not specifically limited here.

[0172] S620: Control the fan of the radiator to be in running state.

[0173] In practical applications, the radiator fan is controlled by the engine controller, and the engine controller is communicated with the vehicle controller. Therefore, the vehicle controller is equivalent to indirectly controlling the radiator fan.

[0174] In a specific example, the fan of the radiator is controlled to be in a running state, specifically:

[0175] (1) The vehicle controller determines the duty cycle of the radiator fan based on the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine, and sends it to the engine controller. For example, an example of the corresponding relationship between the difference Δt between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine and the duty cycle of the radiator fan can be shown in the following table:

[0176]

[0177] It should be noted that the corresponding relationship between Δt and the duty cycle of the fan of the radiator shown in the above table is only an example. In practical applications, including but not limited to this, t1 may be equal to 5°C, t2 may be equal to 10°C, and t3 may be equal to 15°C.

[0178] It can be seen from the above table that when Δt is less than t2, as Δt gradually increases, the fan duty cycle gradually increases, and when Δt is greater than t2, as Δt gradually decreases, the fan duty cycle gradually decreases.

[0179] Because when Δt is less than t2, the maximum temperature of the power battery pack is slightly different from the temperature of the heat exchange medium of the vehicle engine. Therefore, as Δt gradually increases, the heat exchange medium of the vehicle engine is increasingly unable to meet the heat dissipation requirements of the power battery pack. Therefore, in order to meet the heat dissipation requirements of the power battery pack, the required heat dissipation capacity of the fan is increasing, and the fan duty cycle is increasing.

[0180] Because when Δt is greater than t2, the maximum temperature of the power battery pack is significantly different from the temperature of the heat exchange medium of the vehicle engine. Therefore, as Δt gradually decreases, the heat exchange medium of the vehicle engine is increasingly able to meet the heat dissipation requirements of the power battery pack. Therefore, in order to meet the heat dissipation requirements of the power battery pack, the required heat dissipation capacity of the fan becomes smaller and smaller, and then the fan duty cycle becomes smaller and smaller.

[0181] (2) The engine controller controls the radiator fan to rotate at this duty cycle.

[0182] The above example only shows one implementation of S620, which is not limited to the actual application and is not specifically limited here.

[0183] S630, control the thermostat to open.

[0184] In practical applications, the thermostat is controlled by the engine controller, and the engine controller is communicated with the vehicle controller. Therefore, the vehicle controller is equivalent to indirectly controlling the thermostat.

[0185] In a specific example, the thermostat is controlled to open as follows:

[0186] (1) The vehicle controller determines the degree to which the thermostat is opened and sends it to the engine controller.

[0187] (2) The engine controller opens the thermostat to this extent.

[0188] Normally, the thermostat is fully opened to increase the cooling rate of the passive cooling of the power battery pack.

[0189] The above example only shows one implementation of S630, which is not limited to the actual application and is not specifically limited here.

[0190] S640, control the battery water pump to be in operation state.

[0191] In practical applications, the battery water pump is controlled by the vehicle controller, so the vehicle controller is equivalent to directly controlling the battery water pump.

[0192] In a specific example, the battery water pump is controlled to be in a running state, specifically:

[0193] (1) The vehicle controller determines the duty cycle of the battery water pump.

[0194] (2) The vehicle controller ensures that the battery water pump operates at this duty cycle.

[0195] Typically, the duty cycle is set to 50%.

[0196] The above example only shows one implementation of S640, which is not limited to the actual application and is not specifically limited here.

[0197] S650, controlling the second three-way electric control valve to switch the outlet so as to disconnect the second heat exchange circuit in the air conditioning and heating system.

[0198] For example, the connection method of the second three-way electric control valve is as follows Figure 1 Taking the example shown, the second heat exchange circuit in the air conditioning and heating system can be disconnected by controlling the first outlet of the second three-way electric control valve to open and the second outlet to close.

[0199] In practical applications, the second three-way electric control valve is controlled by the air-conditioning controller, and the air-conditioning controller is communicatively connected with the vehicle controller. Therefore, the vehicle controller is equivalent to indirectly controlling the second three-way electric control valve.

[0200] In a specific example, the second three-way electric control valve is controlled to switch the outlet so as to disconnect the second heat exchange circuit in the air conditioning and heating system, specifically:

[0201] (1) The vehicle controller determines the switching status of the outlet of the second three-way electric control valve and sends it to the air conditioning controller in the form of an instruction.

[0202] (2) Based on the instruction, the air conditioning controller controls the second three-way electric control valve to switch the outlet, so that the second heat exchange circuit in the air conditioning heating system is disconnected.

[0203] The above example only shows one implementation of S650, which is not limited to the actual application and is not specifically limited here.

[0204] S660, control the heater water pump to be in operation.

[0205] In practical applications, the heater water pump is controlled by the air conditioning controller, and the air conditioning controller is connected to the vehicle controller in communication. Therefore, the vehicle controller is equivalent to indirectly controlling the heater water pump.

[0206] In a specific example, controlling the warm air water pump to be in a running state may be specifically as follows:

[0207] (1) The vehicle controller determines the duty cycle of the heater water pump and sends it to the air conditioning controller.

[0208] (2) The air conditioning controller controls the heater water pump to operate at this duty cycle.

[0209] Typically, the duty cycle is set to 100%.

[0210] The above example only shows one implementation of S660, which is not limited to the actual application and is not specifically limited here.

[0211] S670, control the first outlet of the first three-way electrically controlled valve to be closed, and the second outlet of the first three-way electrically controlled valve to be opened.

[0212] In practical applications, the first three-way electrically controlled valve is controlled by the vehicle controller, so the vehicle controller is equivalent to directly controlling the first three-way electrically controlled valve.

[0213] In a specific example, the first outlet of the first three-way electrically controlled valve is controlled to be closed and the second outlet of the first three-way electrically controlled valve is controlled to be opened.

[0214] (1) The vehicle controller determines the switch status of the outlet of the first three-way electric control valve.

[0215] (2) According to the instruction, the vehicle controller controls the first outlet of the first three-way electrically controlled valve to be closed and the second outlet of the first three-way electrically controlled valve to be opened.

[0216] The above example only shows one implementation of S670, which is not limited to the actual application and is not specifically limited here.

[0217] It should be noted that, although the above steps are preceded by serial numbers S610 to S670, in actual applications, the execution order of the above steps can be arranged at will. Figure 4 As shown, the above steps are executed in ascending order of serial number. For another example, step S610, step S620, and step S630 are executed simultaneously, and step S640 is executed after step S610, step S620, and step S630, and step S650, step S660, and step S670 are executed simultaneously after step S640.

[0218] It should be noted that, in addition to the above two examples, other implementations that meet the above requirements may also be adopted, not limited to the above two examples, and are not specifically limited here, depending on the specific circumstances.

[0219] Another embodiment of the present application provides a vehicle, the specific structure of which includes: a vehicle controller and a cooling system for the vehicle provided in any of the above embodiments. The vehicle controller is used to execute a cooling method for the vehicle provided in any of the above embodiments.

[0220] In this embodiment, since the vehicle includes the cooling system of the vehicle provided in any of the above embodiments, and the vehicle controller executes the cooling method of the vehicle provided in any of the above embodiments, the vehicle provided in this embodiment can realize the passive cooling of the power battery pack while improving the overall cost performance of the vehicle. In addition, the vehicle provided in this embodiment can also reduce the power consumption when cooling the power battery pack, that is, it can achieve energy saving, and can also improve the endurance of the vehicle.

[0221] Since the vehicle controller executes the vehicle cooling method provided in any of the above embodiments, the vehicle provided in this embodiment achieves passive cooling of the power battery pack.

[0222] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A cooling system for a vehicle, characterized in that: include: Power battery heat exchange circuit, engine heat exchange circuit and first heat exchange module; wherein: The first heat exchange module is used to realize heat exchange between the power battery heat exchange circuit and the engine heat exchange circuit; The engine heat exchange circuit includes a radiator.

2. The cooling system for a vehicle according to claim 1, characterized in that: The first heat exchange module includes: a second heat exchange module and a first heat exchange circuit in the air conditioning and heating system of the vehicle; wherein: The first heat exchange circuit and the engine heat exchange circuit share at least a vehicle engine; The first side of the second heat exchange module is disposed in the first heat exchange loop, and the second side of the second heat exchange module is disposed in the power battery heat exchange loop.

3. The cooling system for a vehicle according to claim 2, characterized in that: The second heat exchange module comprises: a first heat exchanger, a first three-way electric control valve and a first three-way pipe; wherein: The first outlet of the first three-way electrically controlled valve is connected to the first inlet of the first three-way pipe, and the second outlet of the first three-way electrically controlled valve is connected to the second inlet of the first three-way pipe through the first side of the first heat exchanger; The inlet of the first three-way electric control valve serves as the inlet of the first side of the second heat exchange module, and the outlet of the first three-way pipe serves as the outlet of the first side of the second heat exchange module; The inlet of the second side of the first heat exchanger serves as the inlet of the second side of the second heat exchange module, and the outlet of the second side of the first heat exchanger serves as the outlet of the second side of the second heat exchange module.

4. The cooling system for a vehicle according to claim 2, characterized in that: The air conditioning and heating system comprises: an air conditioning heat source, a heating water pump, a second three-way pipe, a second three-way electric control valve, the vehicle engine, and an engine water pump; wherein: The air conditioning heat source, the second three-way electric control valve, the vehicle engine, the engine water pump, the second three-way pipe, and the warm air water pump are connected in series to form the first heat exchange circuit; The air conditioning heat source, the second three-way electric control valve, the second three-way pipe, and the warm air water pump are connected in series to form a second heat exchange circuit in the air conditioning warm air system.

5. The cooling system for a vehicle according to any one of claims 1 to 4, characterized in that: The power battery heat exchange circuit includes: a power battery pack, a second heat exchanger and a battery water pump; wherein: The power battery pack, the first side of the second heat exchanger, and the battery water pump are connected in series to form the power battery heat exchange loop; The second side of the second heat exchanger is connected to the air conditioning cooling system in the vehicle.

6. The cooling system for a vehicle according to any one of claims 1 to 4, characterized in that: The engine heat exchange circuit comprises: a vehicle engine, the radiator, an engine water pump and a thermostat; wherein: The vehicle engine, the radiator, the engine water pump, and the thermostat are connected in series to form the engine heat exchange circuit.

7. A method for cooling a vehicle, characterized in that: A vehicle controller applied to the vehicle, wherein the cooling system of the vehicle according to any one of claims 1 to 6 is controlled by the vehicle controller, and the cooling method comprises: Determining whether the vehicle is in a driving state, a door-open high-voltage state, or a charging state; If the vehicle is in a driving state, a door-open high-voltage state, or a charging state, the power battery pack in the vehicle is passively cooled if the passive cooling conditions are met; Passively cooling the power battery pack in the vehicle includes: operating a power battery heat exchange circuit and an engine heat exchange circuit in the cooling system, operating a radiator fan in the engine heat exchange circuit, and using a first heat exchange module in the cooling system to exchange heat between the power battery heat exchange circuit and the engine heat exchange circuit; Among them, the passive cooling conditions include: the maximum temperature of the power battery pack is within a preset temperature range, the air-conditioning cold source in the air-conditioning cold air system in the vehicle is not turned on, and the first heat exchange module in the cooling system can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit.

8. The vehicle cooling method according to claim 7, characterized in that: The first heat exchange module includes: a second heat exchange module and a first heat exchange circuit in the air conditioning and heating system of the vehicle; The first heat exchange module can exchange heat from the power battery heat exchange circuit to the engine heat exchange circuit, including: the speed of the vehicle engine is less than or equal to a preset speed, and the difference between the maximum temperature of the power battery pack and the temperature of the heat exchange medium of the vehicle engine is greater than a preset temperature difference, and the air-conditioning heat source in the air-conditioning heating system is not turned on.

9. The vehicle cooling method according to claim 7, characterized in that: After passively cooling the power battery pack in the vehicle, the method further includes: During the process of passively cooling the power battery pack, periodically or in real time determining whether the passive cooling condition is not met; If the passive cooling condition is not met, passive cooling of the power battery pack is stopped.

10. The vehicle cooling method according to claim 7, characterized in that: After passively cooling the power battery pack in the vehicle, the method further includes: During the process of passively cooling the power battery pack, periodically or in real time determining whether at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails; If at least one of the power battery heat exchange circuit, the engine heat exchange circuit, and the first heat exchange module fails, passive cooling of the power battery pack is stopped.

11. The vehicle cooling method according to any one of claims 7 to 10, characterized in that: The power battery heat exchange circuit includes a second heat exchanger; If the vehicle is in a driving state, a door-open high-voltage state, or a charging state, the power battery pack is actively cooled when the maximum temperature of the power battery pack is greater than the maximum value of the preset temperature range; Actively cooling the power battery pack includes: keeping the power battery heat exchange circuit and the air conditioning cooling system in operation.

12. A vehicle, characterized in that: include: A vehicle controller and a cooling system for a vehicle as claimed in any one of claims 1 to 6; wherein: The vehicle controller is used to execute the vehicle cooling method as described in any one of claims 7 to 11.

Images