CN114919376A - Battery heat management device of hybrid vehicle type - Google Patents

Abstract

The invention relates to a battery heat management device of a hybrid vehicle type, which comprises a battery cooling liquid loop, a closed refrigeration loop, a closed heating loop and a combined battery cooler, wherein the closed refrigeration loop is connected with an air conditioner refrigerant loop; the air-conditioning refrigerant output from the air-conditioning refrigerant loop into the closed refrigeration loop exchanges heat with the battery cooling liquid output from the battery cooling liquid loop in the combined battery cooler to realize battery cooling; and the engine cooling liquid or the heating working medium output to the closed heating loop from the engine cooling liquid loop or the WPTC heating loop exchanges heat with the battery cooling liquid in the combined battery cooler so as to realize battery heating. The invention can realize air-conditioning refrigeration, can utilize the waste heat of the engine, can also use WPTC for heating, and also considers the heat management of the battery.

Description

A battery thermal management device for a hybrid vehicle

technical field

The invention belongs to the field of battery thermal management, and in particular relates to a battery thermal management device for a hybrid vehicle.

Background technique

Different from traditional fuel vehicle and pure electric vehicle air conditioner, traditional fuel vehicle air conditioner can only use engine waste heat for heating, and pure electric vehicle air conditioner can only use WPTC (WPTC heating circuit) or air PTC (air heating).

In order to save energy and reduce emissions, a hybrid model is developed. The air conditioning system of this model can realize air conditioning and cooling, and can use the waste heat of the engine for heating. It can also use WPTC for heating when the engine is not started. It also takes into account the thermal management of the battery, but the thermal management effect There is still room for further improvement.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a battery thermal management device for a hybrid vehicle in order to solve the above problems.

The present invention realizes above-mentioned purpose through following technical scheme:

A battery thermal management device for a hybrid vehicle includes a battery coolant circuit, a closed refrigeration circuit connected with an air conditioning refrigerant circuit, a closed heating circuit connected with an engine coolant circuit and a WPTC heating circuit, and a battery coolant circuit, Combined battery cooler with closed refrigeration circuit and closed heating circuit connection;

The air-conditioning refrigerant output from the air-conditioning refrigerant circuit to the closed refrigeration circuit exchanges heat with the battery cooling liquid output from the battery cooling liquid circuit in the combined battery cooler to achieve battery cooling;

The engine coolant or heating medium output from the engine coolant circuit or the WPTC heating circuit to the closed heating circuit exchanges heat with the battery coolant in the combined battery cooler to achieve battery heating .

As a further optimized solution of the present invention, the battery cooling liquid circuit includes the No. 1 electronic pump and the battery pack connected in series through the battery cooling liquid pipeline, and an expansion kettle, and the expansion kettle is connected to the No. 1 electronic pump and the battery pack. on the battery coolant line.

As a further optimized solution of the present invention, the air-conditioning refrigerant circuit includes a condenser, a temperature sensor, a pressure sensor, a compressor, an evaporator and a shut-off expansion valve that are connected in series through refrigerant pipes, and the evaporator and the combined battery Both ends of the refrigerant pipeline connected to the cooler are connected to a closed refrigeration circuit through a No. 1 three-way valve, and a temperature and pressure sensor and an electronic expansion valve are arranged on the closed refrigeration circuit.

As a further optimized solution of the present invention, both the engine coolant circuit and the WPTC heating circuit are connected to the heat exchanger through a heating pipeline, the engine coolant and the heating medium are of the same material, and the heating pipeline and the closed heating circuit pass through the third The three-way valve is connected to the three-way valve, the heat exchanger and the evaporator are both located in an air-conditioning box, and the air-conditioning box is cooled by a blower and the evaporator, and heated by the blower and the heat exchanger.

As a further optimized solution of the present invention, the engine coolant circuit includes an engine radiator, a thermostat, a No. 2 electronic pump, an engine water jacket and a No. 2 three-way valve that are connected in series through the engine coolant pipeline. The two ends of the liquid pipeline and the two ends of the heating pipeline are respectively connected by a No. 4 three-way valve and a temperature-controlled one-way valve.

As a further optimized solution of the present invention, the WPTC heating circuit includes a No. 3 electronic pump and a water heater connected in series through a water heating pipe, and the two ends of the water heating pipe and the two ends of the heating pipe pass through a No. 4 tee respectively. Valve and check valve connection.

As a further optimized solution of the present invention, the combined battery cooler includes a plate heat exchanger, and the plate heat exchanger is provided with a battery cooling liquid channel connected to the battery cooling liquid circuit, and a refrigeration channel connected to the closed refrigeration circuit. , and a heating channel connected to a closed heating loop.

The beneficial effects of the present invention are:

1) The battery thermal management device of the present invention can use the combined battery cooler to exchange heat between the battery coolant and the air-conditioning refrigerant, realize battery refrigeration, avoid battery overheating, and can also utilize engine waste heat, WPTC heating and battery coolant heat exchange, Realize battery heating, avoid low temperature charging, the whole device cooperates with sensors, etc., can realize intelligent temperature control of the battery and prolong its service life;

2) The present invention utilizes engine waste heat and WPTC heating not only for battery thermal management, but also for combined use, heating the passenger compartment both before and after the engine is started, and the battery heating and the passenger compartment heating share one WPTC, which is green and energy-saving.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic structural diagram of the WPTC heating circuit of the present invention during heating.

3 is a schematic structural diagram of the engine coolant circuit of the present invention during heating.

In the figure: 1. Battery coolant circuit; 11. Battery coolant pipeline; 12. No. 1 electronic pump; 13. Battery pack; 14. Expansion kettle; 2. Air conditioning refrigerant circuit; 21. Refrigerant pipeline; 22. Condensation 23, temperature sensor; 24, pressure sensor; 25, compressor; 26, evaporator; 27, cut-off expansion valve; 28, No. 1 three-way valve; 3, closed refrigeration circuit; 31, temperature and pressure sensor; 32, Electronic expansion valve; 4, engine coolant circuit; 41, engine coolant pipeline; 42, engine radiator; 43, thermostat; 44, No. 2 electronic pump; 45, engine water jacket; 46, No. 2 three-way valve ;47, No. 4 three-way valve; 48, Temperature control check valve; 5, WPTC heating circuit; 51, Water heating pipeline; 52, No. 3 electronic pump; 53, Water heater; 54, Check valve; 6, Close the heating circuit; 7. Combined battery cooler; 8. Heat exchanger; 9. No. 3 three-way valve; 10. Three-way valve.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and should not be construed as limiting the protection scope of the application. Those skilled in the art can The above application content makes some non-essential improvements and adjustments to this application.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The referred device or element must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation of the present invention; The meaning is two or more.

Example 1

As shown in Figures 1-3, a battery thermal management device for a hybrid vehicle includes a battery coolant circuit 1, a closed refrigeration circuit 3 connected to an air conditioning refrigerant circuit 2, an engine coolant circuit 4 and a WPTC heating circuit 5 A connected closed heating circuit 6, and a combined battery cooler 7 connected to the battery cooling liquid circuit 1, the closed refrigeration circuit 3 and the closed heating circuit 6;

The battery cooling liquid circuit 1 includes the No. 1 electronic pump 12 and the battery pack 13 connected in series through the battery cooling liquid pipeline 11, and the expansion kettle 14, and the expansion kettle 14 is connected between the No. 1 electronic pump 12 and the battery pack 13. On the battery coolant pipeline 11;

The air-conditioning refrigerant circuit 2 includes a condenser 22, a temperature sensor 23, a pressure sensor 24, a compressor 25, an evaporator 26 and a shut-off expansion valve 27, which are sequentially connected in series through a refrigerant pipe 21. The evaporator 26 and the combined type Both ends of the refrigerant pipeline 21 connected to the battery cooler 7 are connected to the closed refrigeration circuit 3 through a No. 1 three-way valve 28, and the closed refrigeration circuit 3 is provided with a temperature and pressure sensor 31 and an electronic expansion valve 32;

The engine coolant circuit 4 and the WPTC heating circuit 5 are both connected to the heat exchanger 8 through a heating pipeline, the engine coolant and the heating medium are of the same material, and the heating pipeline and the closed heating circuit 6 pass through the third three-way valve 9. Connected with the three-way valve 10, the heat exchanger 8 and the evaporator 26 are located in the air-conditioning box, the air-conditioning box uses the blower and the evaporator 26 for cooling, and the blower and the heat exchanger 8 are used for heating ;

The engine coolant circuit 4 includes an engine radiator 42, a thermostat 43, a No. 2 electronic pump 44, an engine water jacket 45 and a No. 2 three-way valve 46 connected in series through an engine coolant pipe 41. The two ends of the pipeline 41 and the two ends of the heating pipeline are respectively connected by a No. 4 three-way valve 47 and a temperature-controlled one-way valve 48. The temperature-controlled one-way valve 48 is a one-way valve with temperature protection, and can only be opened when the required temperature is reached. ;

The WPTC heating circuit 5 includes a No. 3 electronic pump 52 and a water heater 53 that are connected in series through a water heating pipe 51. The two ends of the water heating pipe 51 and the two ends of the heating pipe pass through the No. 4 three-way valve 47 and the two ends respectively. One-way valve 54 is connected;

The air-conditioning refrigerant output from the air-conditioning refrigerant circuit 2 to the closed refrigeration circuit 3 exchanges heat with the battery cooling liquid output from the battery cooling liquid circuit 1 in the combined battery cooler 7 to achieve battery cooling;

The engine coolant or heating medium output from the engine coolant circuit 4 or the WPTC heating circuit 5 to the closed heating circuit 6 exchanges heat with the battery coolant in the combined battery cooler 7, for battery heating.

The combined battery cooler 7 includes a plate heat exchanger, and the plate heat exchanger is provided with a battery coolant channel connected to the battery coolant circuit 1, a refrigeration channel connected to the closed refrigeration circuit 3, and a closed heating channel. Loop 6 is connected to the heating channel.

It should be noted that the entire battery thermal management device can not only realize the thermal management of the battery, but also the thermal management of the air conditioning system;

Thermal management of air conditioning systems:

①When the engine is not started, the pure electric mode is adopted, and the battery supplies power to the condenser 22 (fan), temperature sensor 23, pressure sensor 24, compressor 25, and blower in the air-conditioning refrigerant circuit 2, so that air-conditioning refrigeration can be realized; the battery supplies power to the WPTC The No. 3 electronic pump 52 and the water heater 53 (WPTC) in the heating circuit 5 are powered, the heated heating medium enters the heat exchanger 8 through the heating passage, and the air blown by the blower is exchanged by the heat exchanger 8 for the passenger cabin. heating;

② During the engine startup process, the temperature of the engine coolant is detected by the temperature control check valve 48 in the engine coolant circuit 4. When the engine coolant temperature is not high, the temperature control check valve 48 is closed to avoid low temperature cooling in the engine. After the engine coolant temperature rises, the temperature control check valve 48 opens, the heated engine coolant enters the heat exchanger 8, and the WPTC heating circuit 5 is closed to ensure heating comfort and save electricity .

Thermal management of the battery:

①When charging at low temperature, if the engine is not started, turn on the WPTC, and the heating working fluid heated and transported in it enters the closed heating circuit 6 from the heating pipeline, and then enters the combined battery cooler 7, and the battery coolant flows from the battery coolant pipeline. 11 Enter the combined battery cooler 7. At this time, the heating working fluid can exchange heat with the low-temperature battery coolant, so as to heat the battery and avoid low-temperature charging. The battery heating and the passenger cabin heating share a WPTC;

② During the engine startup process, after the temperature of the engine coolant rises, the temperature control check valve 48 is opened, the heated engine coolant enters the closed heating circuit 6, and then enters the combined battery cooler 7 to exchange heat with the low-temperature battery coolant to achieve Heat up the battery.

The above-mentioned engine coolant and WPTC heating medium all use the same liquid material, such as antifreeze.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (7)

1. A battery thermal management device for a hybrid vehicle is characterized in that: comprising a battery coolant circuit, a closed refrigeration circuit connected with an air conditioning refrigerant circuit, a closed heating circuit connected with an engine coolant circuit and a WPTC heating circuit, and A combined battery cooler connected to a battery coolant circuit, a closed refrigeration circuit and a closed heating circuit; The air-conditioning refrigerant output from the air-conditioning refrigerant circuit to the closed refrigeration circuit exchanges heat with the battery cooling liquid output from the battery cooling liquid circuit in the combined battery cooler to achieve battery cooling; The engine coolant or heating medium output from the engine coolant circuit or the WPTC heating circuit to the closed heating circuit exchanges heat with the battery coolant in the combined battery cooler to achieve battery heating . 2 . The battery thermal management device for a hybrid vehicle according to claim 1 , wherein the battery coolant circuit comprises a No. 1 electronic pump and a battery pack connected in series through a battery coolant pipeline, and an expansion kettle, 3 . The expansion kettle is connected to the battery coolant pipeline between the No. 1 electronic pump and the battery pack. 3 . The battery thermal management device for a hybrid vehicle according to claim 1 , wherein the air-conditioning refrigerant circuit comprises a condenser, a temperature sensor, a pressure sensor, and a compressor that are sequentially connected in series through refrigerant pipes. 4 . , evaporator and cut-off expansion valve, the two ends of the refrigerant pipeline connecting the evaporator and the combined battery cooler are connected to a closed refrigeration circuit through a No. 1 three-way valve, and the closed refrigeration circuit is provided with a temperature pressure sensor and an electronic expansion valve. 4. The battery thermal management device for a hybrid vehicle according to claim 3, wherein the engine coolant circuit and the WPTC heating circuit are connected to a heat exchanger through a heating pipe, and the engine coolant and the heating medium are connected to the heat exchanger. The materials are the same, the heating pipeline and the closed heating circuit are connected through a No. 3 three-way valve and a three-way valve, the heat exchanger and the evaporator are located in the air-conditioning box, and the air-conditioning box uses a blower and the The evaporator cools and uses the blower and the heat exchanger to heat. 5 . The battery thermal management device for a hybrid vehicle according to claim 4 , wherein the engine coolant circuit comprises an engine radiator, a thermostat, a No. 2 electronic A pump, an engine water jacket and a No. 2 three-way valve, the two ends of the engine coolant pipeline and the two ends of the heating pipeline are respectively connected by a No. 4 three-way valve and a temperature-controlled one-way valve. 6 . The battery thermal management device for a hybrid vehicle according to claim 5 , wherein the WPTC heating circuit comprises a No. 3 electronic pump and a water heater connected in series through a water heating pipeline, and the water heating The two ends of the pipeline and the two ends of the heating pipeline are respectively connected by a No. 4 three-way valve and a one-way valve. 7 . The battery thermal management device for a hybrid vehicle according to claim 1 , wherein the combined battery cooler comprises a plate heat exchanger, and the plate heat exchanger is internally provided with a battery cooling liquid. 8 . A battery coolant channel connected to the circuit, a refrigeration channel connected to the closed refrigeration circuit, and a heating channel connected to the closed heating circuit.

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