A hybrid vehicle battery thermal management system and a hybrid vehicle

Abstract

The present invention relates to the technical field of hybrid vehicles, and specifically discloses a hybrid vehicle battery thermal management system. It includes a refrigerant circulation loop, a battery pack natural cooling loop, a battery pack forced cooling loop, a battery pack direct heating loop, and a battery pack indirect heating loop. The controller controls the working states of multiple three-way electronic water valves, electronic water pumps, electric compressors, electromagnetic expansion valves and other components to achieve the heating and cooling requirements of the battery pack. Therefore, by switching and coordinating the natural cooling loop of the battery pack, the forced cooler loop of the battery pack, the direct heating loop of the battery pack, and the indirect heating loop of the battery pack, the problem of overheating and overcooling of the battery pack can be solved effectively, quickly and energy-savingly, thereby ensuring that the battery pack can work normally under any working conditions, and enabling hybrid vehicles to obtain environmental adaptability comparable to that of traditional fuel vehicles.

Description

Technical Field

[0001] The invention belongs to the technical field of hybrid vehicle, and in particular relates to a hybrid vehicle battery thermal system. Background Art

[0002] In order to improve energy utilization, transform the energy utilization system, and realize electrification, new energy and clean transportation, it is the trend and direction of urban public transportation and private transportation development. At present, electric vehicles have technical bottlenecks, and electric vehicle users are facing the problems of charging anxiety and range anxiety. Compared with pure electric vehicle solutions, hybrid vehicles are a very advantageous new energy vehicle solution to achieve clean transportation and solve the anxiety of electric vehicle users at this stage. The core of hybrid technology is to complement each other between the motor and the engine, learn from each other's strengths and weaknesses, and match each other so that the automobile engine can operate in a high efficiency range for a long time. In addition, during braking, the hybrid vehicle system solution can add energy recovery technology, etc., which significantly improves the energy utilization efficiency of the whole vehicle. A reasonable vehicle thermal management system can further improve the energy utilization efficiency of the whole vehicle of hybrid vehicles on this basis, which is one of the most promising research directions at present.

[0003] Different from the thermal management systems of traditional fuel vehicles and pure electric vehicles, the energy utilization system in hybrid vehicles has the characteristics of multiple heat sources, multiple temperature zones and multiple demands. It has a more complex energy utilization network and the thermal load is more diverse and complex. Many load components have more stringent requirements for thermal management, especially power batteries.

[0004] Unlike the thermal management system of pure electric vehicle power batteries, when the hybrid vehicle engine is running, at least 60% to 70% of the fuel calorific value cannot be directly converted into vehicle driving power, but is dissipated through the internal water circulation system. The rational and efficient reuse of waste heat is an effective way to further save energy and reduce usage costs.

[0005] When hybrid vehicles are used in cold regions, after being parked for a long time, the temperature of the power battery is close to the parking environment temperature. After the vehicle is started, due to the characteristic limit of the power battery itself, the vehicle needs to preheat the power battery to the allowable temperature before the power battery can participate in the function of the vehicle system. The length of the battery preheating process is crucial to improving the user experience of the vehicle.

[0006] At present, most of the existing hybrid vehicle battery thermal management systems that use liquid-cooled battery packs use independent electric heating components to achieve the preheating process of the battery pack. The weak power of the power battery is used to provide power for the heating components to achieve low-temperature preheating of the battery pack. Due to the limited discharge performance of the low-temperature battery pack, the heating efficiency is relatively low and wastes the energy of the entire vehicle. In addition, in the battery preheating solution using electric heating components, when the vehicle is parked for a long time or other reasons cause the battery pack to lose power, the electric heating component has no power input, the vehicle battery preheating function fails, and the vehicle cannot drive normally. Summary of the invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art and provide hybrid vehicles with environmental adaptability equivalent to that of traditional fuel vehicles, the purpose of the present invention is to provide a hybrid vehicle battery thermal management system solution to solve the problems of low preheating efficiency, long preheating time in cold areas, and frequent usage problems in most current hybrid vehicle battery thermal management systems.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A hybrid vehicle battery thermal management system includes a refrigerant circulation circuit, a battery pack natural cooling circuit, a battery pack forced cooling circuit, a battery pack direct heating circuit, and a battery pack indirect heating circuit, wherein:

[0010] The refrigerant circulation loop comprises: a condenser, an electric compressor, a refrigerant flow channel of a first heat exchanger and an electromagnetic expansion valve which are sequentially connected in series by a refrigerant pipeline;

[0011] The battery pack natural cooling circuit comprises: a first three-way electronic water valve, a second three-way electronic water valve, a battery heat sink and an electronic water pump which are sequentially connected in series by a cooling water pipeline; the battery heat sink is arranged adjacent to the condenser; the water inlet of the battery pack is connected to the water outlet of the electronic water pump (5) through a pipeline, and the water outlet of the battery pack is connected to the water inlet of the first three-way electronic water valve through a pipeline;

[0012] The battery pack forced cooling circuit comprises: the first three-way electronic water valve, the third three-way electronic water valve, the coolant flow channel of the first heat exchanger and the electronic water pump which are sequentially connected in series by a cooling water pipeline;

[0013] The battery pack direct heating circuit includes: a fourth three-way electronic water valve connected in series with the water outlet of the engine cooling small cycle through a pipeline, and the fourth three-way electronic water valve is connected to the water inlet pipeline of the battery pack through a pipeline; the water outlet pipeline of the battery pack is connected to the water inlet of the engine cooling small cycle through a first water outlet of the first three-way electronic water valve and a second three-way electronic water valve through a pipeline;

[0014] The battery pack indirect heating circuit includes: a second heat exchanger, the first three-way electronic water valve, the third three-way electronic water valve and the fourth three-way electronic water valve; the first flow channel of the second heat exchanger is connected in series with the fourth three-way electronic water valve and the water inlet and outlet of the engine cooling small cycle; the water outlet pipeline of the battery pack is connected to the water inlet pipeline of the electronic water pump via the second water outlet of the first three-way electronic water valve, the third three-way electronic water valve and the second flow channel of the second heat exchanger;

[0015] The hybrid vehicle battery thermal management system also includes a battery temperature sensor. The battery temperature sensor, the electric compressor, the electromagnetic expansion valve, the electronic water pump, the first three-way electronic water valve, the second three-way electronic water valve, the third three-way electronic water valve and the fourth three-way electronic water valve are all connected to the controller electrical signal.

[0016] The controller of the present invention can obtain vehicle and component status and demand information from the vehicle network, and selectively control the operation of components connected to its electrical signals.

[0017] The present invention also includes an engine heat sink, the water inlet of the engine heat sink is connected to the water outlet of the engine cooling cycle through a pipeline, and the water outlet of the engine heat sink is connected to the water inlet of the engine cooling cycle through a pipeline.

[0018] In some specific embodiments, the present invention further comprises a heater core, both ends of which are connected in parallel to the inlet and outlet water pipes of the engine cooling water circulation through pipes.

[0019] According to the hybrid vehicle battery thermal management system of the present invention, the battery pack natural cooling circuit and the battery pack forced cooling circuit are used to selectively achieve the cooling requirement of the battery pack while taking into account the requirements of energy saving and consumption reduction. The battery pack direct heating circuit and the battery pack indirect heating circuit are used to quickly and efficiently achieve the heating requirement of the battery pack under the conditions allowed by the battery pack.

[0020] The second heat exchanger includes a first flow channel and a second flow channel, the first flow channel and the second flow channel are not connected inside the second heat exchanger, and when coolants of different temperatures flow inside the first flow channel and the second flow channel respectively, the coolants inside the first flow channel and the second flow channel exchange heat in the second heat exchanger. In some embodiments of the present invention, the second heat exchanger is preferably a plate heat exchanger.

[0021] In some embodiments of the present invention, the first heat exchanger includes a refrigerant flow channel and a coolant flow channel. The refrigerant circulation loop also includes a solenoid valve, a thermal expansion valve and an evaporator which are connected in series and in parallel with the first heat exchanger and the electromagnetic expansion valve. The refrigerant flow channel, the electric compressor, the condenser, the solenoid valve (SOV), the thermal expansion valve (TXV), the evaporator, and the electromagnetic expansion valve (E-TXV) are connected through air conditioning pipelines. When the first heat exchanger needs to perform refrigeration work, the liquid supercooled refrigerant compressed and condensed by the electric compressor is expanded and depressurized by the electromagnetic expansion valve and evaporates and absorbs heat in the first heat exchanger. At this time, the coolant flowing in the coolant flow channel exchanges heat with the refrigerant that evaporates and absorbs heat to achieve cooling of the coolant. Specifically, the first heat exchanger in the present invention is preferably a chiller.

[0022] In some embodiments of the present invention, the first, second, third and fourth three-way electronic water valves each include a water inlet A and two water outlets B and C. The three-way electronic water valve can be controlled by a controller to switch between AB and AC to achieve a change in the water flow direction.

[0023] Due to the adoption of the above technical solution, the hybrid vehicle battery thermal management system of the present invention can operate in natural cooling function, forced cooling function, direct heating function and indirect heating function through the control of the controller to achieve the purpose of the invention.

[0024] (1) Natural cooling function

[0025] When the controller obtains a battery cooling request or obtains a battery temperature signal to determine that the battery needs to be cooled, the controller determines the ambient temperature conditions. If the ambient conditions meet the natural heat dissipation temperature threshold defined during system design, the controller will preferentially try to use the battery pack natural cooling circuit to achieve battery pack cooling. The coolant flows to the liquid-cooled power battery pack through the first three-way electronic water valve, the second three-way electronic water valve, the battery heat sink, and the electronic water pump, and then flows to the liquid-cooled power battery pack to cool the battery pack naturally.

[0026] (2) Forced cooling function

[0027] 2a), when the controller control system is performing natural cooling of the battery pack, the controller monitors the internal temperature value of the battery pack in real time and compares the temperature changes. If the internal temperature value of the battery pack still reaches the defined trigger temperature of the battery pack forced cooling during the natural cooling of the battery pack, the controller control system closes the natural cooling circuit of the battery pack and switches to the forced cooling circuit of the battery pack to achieve forced cooling of the battery pack. The refrigerant passes through the electric compressor, condenser, electromagnetic expansion valve (E-TXV) and the refrigerant flow channel of the first heat exchanger in sequence. The coolant passes through the first three-way electronic water valve, the third three-way electronic water valve, the coolant flow channel of the first heat exchanger, and the electronic water pump, and then flows to the liquid-cooled power battery pack. The flowing refrigerant and the flowing coolant complete heat exchange in the first heat exchanger to obtain low-temperature coolant. After the low-temperature coolant flows through the liquid-cooled power battery pack, the battery pack is forced to cool.

[0028] 2b), when the controller obtains a battery cooling request or the controller obtains a battery temperature signal and determines that the battery needs to be cooled, after the controller determines the ambient temperature conditions, if the ambient temperature does not meet the natural heat dissipation temperature threshold defined during system design, the controller control system starts the battery pack forced cooling system to achieve forced cooling of the battery pack. The refrigerant passes through the electric compressor, condenser, electromagnetic expansion valve (E-TXV) and the refrigerant flow channel of the first heat exchanger in sequence. The coolant passes through the first three-way electronic water valve, the third three-way electronic water valve, the coolant flow channel of the first heat exchanger, and the electronic water pump, and then flows to the liquid-cooled power battery pack. The flowing refrigerant and the flowing coolant complete heat exchange in the first heat exchanger to obtain low-temperature coolant. After the low-temperature coolant flows through the liquid-cooled power battery pack, the battery pack is forced to cool.

[0029] (3) Direct heating function

[0030] When the controller obtains a battery heating request or the controller obtains a battery temperature signal and determines that the battery needs to be heated, the controller obtains the engine internal water temperature signal and determines the temperature conditions. If the engine water temperature meets the battery direct heating temperature threshold defined during system design, the controller control system turns on the battery pack direct heating circuit to achieve direct heating of the battery pack. The coolant flows from the outlet of the engine cooling system small cycle through the fourth three-way electronic water valve to the liquid-cooled power battery pack, and then flows back to the water inlet of the engine cooling system small cycle through the first three-way electronic water valve and the second three-way electronic water valve. After the coolant flows out of the outlet of the engine cooling system small cycle according to the above-mentioned circuit, it exchanges heat with the battery body in the liquid-cooled power battery pack to achieve direct heating of the battery pack.

[0031] (4) Indirect heating function

[0032] When the controller control system performs direct heating of the battery pack, the controller monitors the internal temperature value of the battery pack and the water temperature flowing into the water inlet of the battery pack in real time. If the temperature value of the battery water inlet or the internal temperature of the engine reaches the trigger temperature threshold of the indirect water temperature heating of the battery pack, the controller controls the hybrid vehicle battery thermal management system to switch to the indirect heating circuit of the battery pack. At this time, in the first flow channel of the second heat exchanger, the coolant flows from the water outlet of the small cycle of the engine cooling system through the fourth three-way electronic water valve and the first flow channel of the second heat exchanger to return to the water inlet of the small cycle of the engine cooling system. In the second flow channel of the second heat exchanger, the coolant flows from the electronic water pump to the liquid-cooled power battery pack and then flows back to the electronic water pump after passing through the first three-way electronic water valve, the third three-way electronic water valve, and the second flow channel of the second heat exchanger. The two coolants with different temperatures in the first flow channel and the second flow channel exchange heat in the second heat exchanger to achieve indirect heating of the battery pack.

[0033] Another object of the present invention is to provide a hybrid vehicle, which adopts the hybrid vehicle battery thermal management system.

[0034] Due to the adoption of the above technical scheme, the technical effect achieved by the present invention is: the controller realizes the heating and cooling requirements of the battery pack by controlling the working states of components such as the three-way electronic valve, the electronic expansion valve, the electronic water pump, and the electric compressor; by controlling the switching and coordination of the natural cooling circuit, the forced cooling circuit, the direct heating circuit, and the indirect heating circuit of the battery pack, the problem of overheating and overcooling of the battery pack can be solved effectively, quickly, and energy-savingly, thereby ensuring that the battery pack can work normally under any working conditions, and enabling the hybrid vehicle to obtain environmental adaptability comparable to that of traditional fuel vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Attached Figure 1 It is a schematic diagram of a hybrid vehicle battery thermal management system of the present invention;

[0036] Attached Figure 2 It is a functional status list of a hybrid vehicle battery thermal management system of the present invention.

[0037] In the attached figure: 1-engine heat sink, 2-engine, 3-heater core, 4-three-way water valve-④ (fourth three-way electronic water valve), 5-electronic water pump, 6-liquid-cooled power battery pack, 7-three-way water valve-② (first three-way electronic water valve), 8-three-way water valve-① (second three-way electronic water valve), 9-battery heat sink, 10-plate heat exchanger, 11-three-way water valve-③ (third three-way electronic water valve), 12-cooler, 13-electric compressor, 14-condenser, 15-solenoid valve (SOV), 16-thermal expansion valve (TXV), 17-evaporator, 18-solenoid expansion valve (E-TXV), 19-electronic fan. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] Embodiment 1

[0040] like Figure 1 As shown, this embodiment is a hybrid vehicle battery thermal management system, which includes a refrigerant circulation circuit, a battery pack natural cooling circuit, a battery pack forced cooling circuit, a battery pack direct heating circuit and a battery pack indirect heating circuit. The specific structure of each circuit is described in detail below.

[0041] Refrigerant circulation circuit

[0042] The refrigerant flow channel and electromagnetic expansion valve 18 of the condenser 14, the electric compressor 13, the cooler 12 (i.e., the first heat exchanger, distinguished from the plate heat exchanger 10 as the second heat exchanger) connected in series by the refrigerant pipeline form a refrigerant circulation loop. The cooler 12 includes a refrigerant flow channel and a coolant flow channel. The refrigerant circulation loop also includes a solenoid valve 15, a thermal expansion valve 16, and an evaporator 17 connected in series with the cooler 12 and the electromagnetic expansion valve 18. When the cooler 12 needs to perform refrigeration work, the liquid supercooled refrigerant compressed and condensed by the electric compressor 13 is expanded and depressurized by the electromagnetic expansion valve 18 and evaporates and absorbs heat in the cooler 12. At this time, the coolant flowing in the coolant flow channel exchanges heat with the refrigerant evaporating and absorbing heat, thereby cooling the coolant.

[0043] Battery pack natural cooling circuit

[0044] The three-way water valve-②7, the three-way water valve-①8, the battery heat sink 9 and the electronic water pump 5 are connected in series in sequence through the cooling water pipeline, the water inlet of the battery pack 6 is connected to the water outlet of the electronic water pump 5 through the pipeline, and the water outlet of the battery pack 6 is connected to the water inlet A of the three-way water valve-②7 through the pipeline. The battery heat sink 9 is arranged adjacent to the condenser 14. In this embodiment, the electronic fan 19 is arranged on the opposite side of the battery heat sink 9, and is used to blow the cooling wind at the condenser 14 to the battery heat sink 9.

[0045] Battery pack forced cooling circuit

[0046] The three-way water valve ②7, the three-way water valve ③11, the coolant flow channel of the cooler 12 and the electronic water pump 5 are connected in series in sequence through the cooling water pipeline.

[0047] Battery pack direct heating circuit

[0048] The three-way water valve-④4 is connected in series with the water outlet of the engine 2 cooling small cycle through a pipeline, and the three-way water valve-④4 is connected to the water inlet pipeline of the battery pack 6 through a pipeline; the water outlet pipeline of the battery pack 6 is connected to the water inlet of the engine 2 cooling small cycle through the first water outlet B of the three-way water valve-②7 and the three-way water valve-①8 through a pipeline. Specifically, Figure 1 As shown, the water inlet A of the three-way water valve-①8 is connected to the first water outlet B of the three-way water valve-②, the first water outlet B of the three-way water valve-①8 is connected to the water inlet of the battery heat sink 9, and the second water outlet C of the three-way water valve-①8 is connected to the water inlet pipeline of the engine 1 cooling small cycle.

[0049] Indirect heating circuit for battery pack

[0050] The first flow channel of the plate heat exchanger 10 is connected in series with the three-way water valve-④4 and the water inlet and outlet of the engine 2 cooling small cycle; the water outlet pipeline of the battery pack 6 is connected to the water inlet pipeline of the electronic water pump 5 via the second water outlet C of the three-way water valve-②7, the three-way water valve-③11 and the second flow channel of the plate heat exchanger 10. Specifically, the water inlet A of the three-way water valve-④4 is connected to the water outlet pipeline of the engine cooling small cycle, the first water outlet B of the three-way water valve-④4 is connected to the water inlet of the first flow channel of the plate heat exchanger 10, and the second water outlet C of the three-way water valve-④4 is connected to the water inlet pipeline of the battery pack 6. The water inlet A of the three-way water valve-③11 is connected to the second water outlet C of the three-way water valve-②7, the first water outlet B of the three-way water valve-③11 is connected to the water inlet of the coolant flow channel of the cooler 12; the second water outlet C of the three-way water valve-③11 is connected to the water inlet of the second flow channel of the plate heat exchanger 10.

[0051] The three-way water valve-②7, three-way water valve-①8, three-way water valve-③11 and three-way water valve-④4 in this embodiment all have a water inlet A and two water outlets B and C. The three-way electronic water valve can be controlled by the controller to switch between AB and AC to achieve the change of water flow direction.

[0052] The hybrid vehicle battery thermal management system of this embodiment also includes a battery temperature sensor for detecting the temperature signal inside the battery pack. The battery temperature sensor, electric compressor 13, solenoid valve 15, solenoid expansion valve 18, electronic fan 19, electronic water pump 5, three-way water valve-②7, three-way water valve-①8, three-way water valve-③11 and three-way water valve-④4 are all connected to the controller by electrical signals. The controller can obtain the vehicle and parts status and demand information from the vehicle network, and selectively control the operation of the components connected to its electrical signals.

[0053] The present embodiment further includes an engine heat sink 1, the water inlet of the engine heat sink 1 is connected to the water outlet of the engine cooling cycle through a pipeline, and the water outlet of the engine heat sink 1 is connected to the water inlet of the engine cooling cycle through a pipeline. In order to increase the heat dissipation efficiency, a mechanical fan is also relatively arranged on one side of the engine heat sink 1.

[0054] In this embodiment, a heater core is connected in parallel to the inlet and outlet pipes of the engine cooling water circulation through pipes, and the hot air heated by the heater core is blown into the vehicle interior by a blower for heating the vehicle interior.

[0055] The hybrid vehicle battery thermal management system of this embodiment selectively realizes the cooling requirement of the battery pack while taking into account the requirements of energy saving and consumption reduction through the battery pack natural cooling circuit and the battery pack forced cooling circuit. The heating requirement of the battery pack is realized quickly and efficiently under the conditions allowed by the battery pack through the battery pack direct heating circuit and the battery pack indirect heating circuit. Figure 2 The control process and functions of the present invention are further described in detail.

[0056] (1) Natural cooling function of battery pack

[0057] During the vehicle startup and operation, when the controller obtains a battery cooling request or obtains a battery temperature signal to determine that the battery needs to be cooled, the controller determines the ambient temperature conditions. If the ambient conditions meet the natural heat dissipation temperature threshold defined during system design, the controller control system uses natural cooling of the battery pack to achieve battery pack cooling. The controller controls the functions of components electrically connected to it. At this time, the flow channel AC of the three-way water valve-①8 is closed and AB is opened, the electronic fan 19 is turned on, the electronic water pump 5 is turned on, the flow channel AC of the three-way water valve-②7 is closed and AB is opened, and the flow channel AC of the three-way water valve-④4 is closed and AB is opened.

[0058] During the operation of the battery pack natural cooling loop, the controller monitors the internal temperature of the battery pack in real time and compares the temperature changes:

[0059] If the internal temperature of the battery pack still reaches the defined trigger temperature for forced cooling of the battery pack during the natural cooling of the battery pack, the controller control system shuts down the natural cooling system of the battery pack and switches to the forced cooling system of the battery pack.

[0060] If the internal temperature of the battery pack still reaches the defined battery cooling system shutdown temperature threshold or the battery pack sends a cooling shutdown request during the natural cooling process, the controller controls the working state of the components electrically connected to it. At this time, the flow channel AC of the three-way water valve-①8 is closed and AB is opened, the electronic fan 19 is closed, the electronic water pump 5 is closed, the flow channel AC of the three-way water valve-②7 is closed and AB is opened, and the flow channel AC of the three-way water valve-④4 is closed and AB is opened.

[0061] (2) Battery pack forced cooling function

[0062] During the vehicle startup process, when the controller obtains a battery cooling request or the controller obtains a battery temperature signal to determine that the battery needs to be cooled, after the controller determines the ambient temperature conditions, if the ambient temperature does not meet the natural heat dissipation temperature threshold defined during system design or the running battery pack natural heat dissipation system does not meet the battery pack cooling requirements, the controller controls the system to start the battery pack forced cooling system to achieve forced cooling of the battery pack. The controller controls the working state of the components electrically connected to it. At this time, the flow channel AC of the three-way water valve-①7 is open and AB is closed, the flow channel AC of the three-way water valve-③11 is closed and AB is open, the electronic water pump 5 is turned on, the electronic fan 19 is turned on, the electric compressor 13 is turned on, the electromagnetic expansion valve 18 (E-TXV) is turned on, and the flow channel AC of the three-way water valve-④4 is closed and AB is opened.

[0063] During the operation of the battery pack forced cooling circuit, the controller monitors the internal temperature value of the battery pack and compares the temperature changes in real time:

[0064] If during the forced cooling of the battery pack, the internal temperature of the battery pack still reaches the defined battery cooling system shutdown temperature threshold or the battery pack sends a cooling shutdown request, the controller controls the working state of the components electrically connected to it. At this time, the flow channel AC of the three-way water valve-①7 is opened and AB is closed, the flow channel AC of the three-way water valve-③11 is closed and AB is opened, the electronic water pump 5 is closed, the electronic fan 9 is closed, the electric compressor 13 is closed, the electromagnetic expansion valve 18 (E-TXV) is closed, and the flow channel AC of the three-way water valve-④4 is closed and AB is opened.

[0065] (3) Direct heating function of battery pack

[0066] During the vehicle startup process, when the controller obtains a battery heating request or the controller obtains a battery temperature signal to determine that the battery needs to be heated, the controller obtains the internal water temperature of the engine and determines the temperature conditions. If the engine water temperature meets the battery direct heating temperature threshold defined during system design, the controller controls the system to start the battery pack direct heating system to achieve direct heating of the battery pack. The controller controls the working state of the components electrically connected to it. At this time, the flow channel AC of the three-way water valve-②7 is closed and AB is opened, the flow channel AC of the three-way water valve-①8 is opened and AB is closed, the AC of the three-way water valve-④4 is opened and AB is closed, and the engine 2 starts the operation request.

[0067] During the operation of the battery pack direct heating circuit, the controller monitors the internal temperature of the battery pack and the temperature change of the water inlet of the battery pack in real time:

[0068] If the battery pack sends a battery heating shutdown request or the internal temperature of the battery reaches the battery heating shutdown temperature threshold, the controller turns off the battery heating function. At this time, the flow channel AC of the three-way water valve-②7 is closed and AB is opened, the flow channel AC of the three-way water valve-①8 is closed and AB is opened, the flow channel AC of the three-way water valve-④4 is closed and AB is opened, and the engine 2 shuts down the operation request.

[0069] If the temperature value of the battery water inlet reaches the trigger temperature threshold of the indirect water heating of the battery pack, the controller controls the hybrid vehicle battery thermal management system to switch to the battery pack indirect heating circuit.

[0070] (4) Indirect heating function of battery pack

[0071] During the vehicle startup process, when the controller obtains a battery heating request or the controller obtains a battery temperature signal to determine that the battery needs to be heated, the controller obtains the engine internal water temperature and determines the temperature conditions. If the engine internal temperature reaches the battery pack indirect water temperature heating trigger temperature threshold, the controller controls the hybrid vehicle battery thermal management system to switch to the battery pack indirect heating circuit to achieve indirect heating of the battery pack. The controller controls the working state of the components electrically connected to it. At this time, the flow channel AC of the three-way water valve-④4 is closed, AB is opened, the electronic water pump 5 is opened, the flow channel AC of the three-way water valve-②7 is opened, AB is closed, the flow channel AC of the three-way water valve-③11 is opened, AB is closed, and the engine 2 starts the operation request.

[0072] During the operation of the battery pack indirect heating circuit, the controller monitors the internal temperature of the battery pack and the temperature change of the water inlet of the battery pack in real time:

[0073] If the battery pack sends a battery heating shutdown request or the internal temperature of the battery reaches the battery heating shutdown temperature threshold, the controller turns off the battery heating function. At this time, the flow channel AC of the three-way water valve-④4 is closed, AB is opened, the electronic water pump 5 is turned off, the flow channel AC of the three-way water valve-②7 is opened, AB is closed, the flow channel AC of the three-way water valve-③11 is opened, AB is closed, and the engine 2 shuts down the operation request.

[0074] Embodiment 2

[0075] This embodiment provides a hybrid vehicle, which adopts the hybrid vehicle battery thermal management system of the first embodiment.

[0076] The above embodiments are only for illustrating the concept and features of the present invention, and their purpose is to enable those familiar with this technology to understand the contents of the present invention and implement them accordingly. 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 hybrid vehicle battery thermal management system, It is characterized in that It includes a refrigerant circulation circuit, a battery pack natural cooling circuit, a battery pack forced cooling circuit, a battery pack direct heating circuit and a battery pack indirect heating circuit, among which: The refrigerant circulation loop comprises: a condenser, an electric compressor, a first heat exchanger and an electromagnetic expansion valve connected in series by a refrigerant pipeline; the refrigerant circulation loop also comprises an electromagnetic valve, a thermal expansion valve and an evaporator connected in series with the first heat exchanger and the electromagnetic expansion valve in parallel; The battery pack natural cooling circuit comprises: a first three-way electronic water valve, a second three-way electronic water valve, a battery heat sink and an electronic water pump which are sequentially connected in series by a cooling water pipeline; the battery heat sink is arranged adjacent to the condenser; the water inlet of the battery pack is connected to the water outlet of the electronic water pump through a pipeline, and the water outlet of the battery pack is connected to the water inlet of the first three-way electronic water valve through a pipeline; The battery pack forced cooling circuit comprises: the first three-way electronic water valve, the third three-way electronic water valve, the first heat exchanger and the electronic water pump which are sequentially connected in series by a cooling water pipeline; The battery pack direct heating circuit includes: a fourth three-way electronic water valve connected in series with the water outlet of the engine cooling small cycle through a pipeline, and the fourth three-way electronic water valve is connected to the water inlet pipeline of the battery pack through a pipeline; the water outlet pipeline of the battery pack is connected to the water inlet of the engine cooling small cycle through a first water outlet of the first three-way electronic water valve and a second three-way electronic water valve through a pipeline; The battery pack indirect heating circuit comprises: a second heat exchanger, the first three-way electronic water valve, the third three-way electronic water valve and the fourth three-way electronic water valve; the first flow channel of the second heat exchanger is connected in series with the fourth three-way electronic water valve (4) and the water inlet and outlet of the engine cooling small cycle; the water outlet pipeline of the battery pack is connected to the water inlet pipeline of the electronic water pump via the second water outlet of the first three-way electronic water valve, the third three-way electronic water valve and the second flow channel of the second heat exchanger; The hybrid vehicle battery thermal management system also includes a battery temperature sensor. The battery temperature sensor, the electric compressor, the electromagnetic expansion valve, the electronic water pump, the first three-way electronic water valve, the second three-way electronic water valve, the third three-way electronic water valve and the fourth three-way electronic water valve are all connected to the controller electrical signal.

2. The hybrid vehicle battery thermal management system according to claim 1, It is characterized in that It also includes an electronic fan, which is arranged on the opposite side of the battery heat sink and is used to blow the cooling wind at the condenser to the battery heat sink; the electronic fan is connected to the controller with an electrical signal.

3. The hybrid vehicle battery thermal management system according to claim 1, It is characterized in that It also includes an engine cooling element, the water inlet of the engine cooling element is connected to the water outlet of the engine cooling large cycle through a pipeline, and the water outlet of the engine cooling element is connected to the water inlet of the engine cooling large cycle through a pipeline.

4. The hybrid vehicle battery thermal management system according to claim 3, It is characterized in that It also includes a heater core (3), both ends of which are connected in parallel to the inlet and outlet water pipelines of the engine cooling water circulation through pipelines.

5. The hybrid vehicle battery thermal management system according to claim 1, It is characterized in that The water inlet of the second three-way electronic water valve is connected to the first water outlet of the first three-way electronic water valve, the first water outlet of the second three-way electronic water valve is connected to the water inlet of the battery heat sink, and the second water outlet of the second three-way electronic water valve is connected to the water inlet pipeline of the engine cooling small cycle.

6. The hybrid vehicle battery thermal management system according to claim 1, It is characterized in that The first heat exchanger includes a refrigerant flow channel and a coolant flow channel; the water inlet of the third three-way electronic water valve is connected to the second water outlet of the first three-way electronic water valve, and the first water outlet of the third three-way electronic water valve is connected to the water inlet of the coolant flow channel of the first heat exchanger; the second water outlet of the third three-way electronic water valve is connected to the water inlet of the second flow channel of the second heat exchanger.

7. The hybrid vehicle battery thermal management system according to claim 1, It is characterized in that The water inlet of the fourth three-way electronic water valve is connected to the water outlet pipeline of the engine cooling small cycle, the first water outlet of the fourth three-way electronic water valve is connected to the water inlet of the first flow channel of the second heat exchanger, and the second water outlet of the fourth three-way electronic water valve is connected to the water inlet pipeline of the battery pack.

8. A hybrid vehicle, It is characterized in that It has a hybrid vehicle battery thermal management system according to any one of claims 1-7.

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