Light commercial vehicle double-loop battery thermal management system and control method

Abstract

The invention relates to a light commercial vehicle double-loop battery heat management system and a control method, the light commercial vehicle double-loop battery heat management system comprises a radiator assembly, the radiator assembly comprises a battery radiator, the battery radiator is connected with a three-way reversing valve and an air conditioner cooling loop through a battery cooler Chiller, and the three-way reversing valve is connected with a low-temperature heat dissipation loop and a high-temperature heat dissipation loop; the battery radiator is connected with the battery water pump and the battery pack through the three-way reversing valve to form a low-temperature radiating loop; the battery radiator is connected with the battery cooler, the battery water pump and the battery pack through the three-way reversing valve to form a high-temperature radiating loop; the battery cooler Chiller is connected with a refrigerant pipeline through an adapter substitute, the refrigerant pipeline is connected with a refrigerant pressure and temperature sensor PT, and the refrigerant pressure and temperature sensor PT is connected with a condenser through a compressor to form an air conditioner cooling loop; a first expansion water tank is connected between the three-way reversing valve and the battery water pump; double-loop efficient cooling is achieved, the size is small, arrangement is flexible, and the system is suitable for various vehicle types.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a dual-circuit battery thermal management system and a control method for a light commercial vehicle. Background Art

[0002] Under the guidance and promotion of favorable factors such as national policies, road rights, and operating costs, the market penetration rate of new energy light commercial vehicles continues to increase, and market demand tends to stabilize. At present, the use of new energy light commercial vehicles is transitioning from short-distance urban distribution to medium- and long-distance inter-city distribution. The selection of power batteries for new energy light commercial vehicles is developing towards large power, and based on the demand for super-fast charging and high-rate charging and discharging, the demand for power battery thermal management has become the main contradiction.

[0003] At present, the cost of new energy light commercial vehicles has become the focus of attention of all OEMs. Due to their relatively low cost requirements and limited vehicle layout, the widely used independent battery thermal management units cannot be promoted on a large scale in new energy light commercial vehicles.

[0004] The widely used power battery thermal management solutions integrated with the cockpit air conditioning system are mostly full chassis layout, that is, adding a large number of thermal management system components to the limited space. Although this solution greatly reduces the cost and can meet the thermal requirements of the power battery, it leads to a messy layout of the whole vehicle, high risk of interference, poor maintenance convenience, and poor compatibility with different models. In addition, the industry's common integrated thermal management solutions only rely on refrigerant-air and refrigerant-coolant heat exchange to meet the thermal requirements of the battery and the cockpit, which will cause a sudden increase in the failure rate of the electric air conditioning compressor. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a dual-circuit battery thermal management system and a control method for a light commercial vehicle.

[0006] In order to solve the problems in the above background technology, the present invention is implemented by the following technical solutions:

[0007] A dual-circuit battery thermal management system for a light commercial vehicle comprises a radiator assembly, wherein the radiator assembly comprises a battery radiator, wherein the battery radiator is connected to a battery cooler chiller, a three-way reversing valve and an air-conditioning cooling circuit, wherein the three-way reversing valve is respectively connected to a low-temperature heat dissipation circuit and a high-temperature heat dissipation circuit; the battery radiator is connected to a battery water pump and a battery pack through a three-way reversing valve to form a low-temperature heat dissipation circuit; the battery radiator is connected to a battery cooler chiller, a battery water pump and a battery pack through a three-way reversing valve to form a high-temperature heat dissipation circuit; the battery cooler chiller is connected to a refrigerant pipeline through a conversion joint, the refrigerant pipeline is connected to a refrigerant pressure and temperature sensor PT, and the refrigerant pressure and temperature sensor PT is connected to a condenser through a compressor to form an air-conditioning cooling circuit; a first expansion water tank is connected between the three-way reversing valve and the battery water pump.

[0008] Furthermore, the water outlet of the battery radiator is connected to the battery water pump and the battery pack through the three-way reversing valve, and the battery pack is connected to the return water outlet of the battery radiator to form a low-temperature heat dissipation circuit; after the three-way reversing valve is connected to the battery water pump, the battery pack and the battery cooler chiller, the battery cooler chiller is connected in series to the low-temperature heat dissipation circuit through the three-way reversing valve to form the high-temperature heat dissipation circuit.

[0009] Furthermore, a water temperature sensor is provided between the battery water pump and the battery pack.

[0010] Furthermore, a refrigerant stop valve SOV and an evaporator are connected in parallel between the conversion joint and the compressor, and the refrigerant pipeline is fixed by a connecting pressure plate.

[0011] Furthermore, the radiator assembly also includes a motor radiator, the water outlet of the motor radiator is respectively connected to the second expansion water tank and the motor water pump, the motor water pump is connected to the drive motor through a five-in-one controller, and the drive motor is connected to the return water outlet of the motor radiator to form a motor cooling circuit.

[0012] Furthermore, an electronic fan is provided at one end of the radiator assembly, and a wind shield is provided at the other end of the radiator assembly.

[0013] A dual-circuit battery thermal management control method for a light commercial vehicle is applied to any of the above-described dual-circuit battery thermal management systems for a light commercial vehicle. When a battery pack outputs a cooling demand and a water temperature sensor detects that the water temperature on the water inlet side of the battery pack is 10<t≤15°C, the battery water pump is turned on by a vehicle controller VCU, a three-way reversing valve is switched to a low-temperature heat dissipation circuit, and an electronic fan is turned on to achieve coolant-air heat exchange, thereby performing low-load heat dissipation on the battery pack. When the water temperature sensor detects that the water temperature on the water inlet side of the battery pack is t≥15°C, the battery water pump is kept working continuously, and a battery chiller, an electronic fan, and a compressor are turned on in sequence, and the coolant is heat-dissipated by the refrigerant heat exchange of the air-conditioning cooling circuit through the high-temperature heat dissipation circuit to dissipate heat from the battery pack.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] 1. The present invention realizes efficient cooling of dual-circuit comprehensive thermal management of power batteries for light commercial vehicles. The independently designed dual-circuit battery thermal management integrated unit is small in size and flexible in layout. It is suitable for a variety of light commercial vehicle models and can meet the thermal management requirements of power batteries with a capacity of 80-110 kWh.

[0016] 2. The thermal management control of the whole vehicle is integrated into the vehicle controller VUC, realizing flexible switching of multiple working modes of thermal management of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the framework of the present invention

[0018] Figure 2 It is a schematic diagram of the structure of the low-temperature and high-temperature heat dissipation circuits of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the radiator assembly of the present invention.

[0020] Reference numerals:

[0021] 1. Condenser; 2. Compressor; 3. Refrigerant shut-off valve SOV; 4. Evaporator; 5. Refrigerant pressure temperature sensor PT; 6. Battery cooler chiller; 7. Three-way reversing valve; 8. First expansion water tank; 9. Second expansion water tank; 10. Motor radiator; 11. Battery radiator; 12. Wind shield; 13. Electronic fan; 14. Motor water pump; 15. Five-in-one controller; 16. Drive motor; 17. Battery pack; 18. Battery water pump; 19. Water temperature sensor; 20. Radiator assembly; 21. Connecting plate. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 1-Figure 3As shown, a dual-circuit battery thermal management system for a light commercial vehicle includes a radiator assembly 20, and the radiator assembly 20 includes a battery radiator 11. The battery radiator 11 is connected to a battery cooler chiller 6, a three-way reversing valve 7 and an air-conditioning cooling circuit. The three-way reversing valve 7 is respectively connected to a low-temperature heat dissipation circuit and a high-temperature heat dissipation circuit; the battery radiator 11 is connected to a battery water pump 18 and a battery pack 17 through the three-way reversing valve 7 to form a low-temperature heat dissipation circuit; the battery radiator 11 is connected to a battery cooler chiller 6, a battery water pump 18 and a battery pack 17 through the three-way reversing valve 7 to form a high-temperature heat dissipation circuit; the battery cooler chiller 6 is connected to a refrigerant pipeline through a conversion joint, the refrigerant pipeline is connected to a refrigerant pressure and temperature sensor PT5, and the refrigerant pressure and temperature sensor PT5 is connected to a condenser 1 through a compressor 2 to form an air-conditioning cooling circuit; a first expansion water tank 8 is connected between the three-way reversing valve 7 and the battery water pump 18.

[0024] The water outlet of the battery radiator 11 is connected to the battery water pump 18 and the battery pack 17 through the three-way reversing valve 7, and the battery pack 17 is connected to the return water outlet of the battery radiator 11 to form a low-temperature heat dissipation circuit; after the three-way reversing valve 7 is connected to the battery water pump 18, the battery pack 17 and the battery cooler chiller 6, the battery cooler chiller 6 is connected in series to the low-temperature heat dissipation circuit through the three-way reversing valve 7 to form a high-temperature heat dissipation circuit.

[0025] A water temperature sensor 19 is provided between the battery water pump 18 and the battery pack 17 .

[0026] A refrigerant stop valve SOV3 and an evaporator 4 are connected in parallel between the conversion joint and the compressor 2 , and the refrigerant pipeline is fixed by a connecting pressure plate 21 .

[0027] The radiator assembly 20 also includes a motor radiator 10, the water outlet of the motor radiator 10 is respectively connected to the second expansion water tank 9 and the motor water pump 14, the motor water pump 14 is connected to the drive motor 16 through the five-in-one controller 15, and the drive motor 16 is connected to the return water outlet of the motor radiator 10 to form a motor cooling circuit.

[0028] An electronic fan 13 is also provided at one end of the radiator assembly 20 , and a wind shield 12 is provided at the other end of the radiator assembly 20 .

[0029] Example 2

[0030] A dual-circuit battery thermal management control method for a light commercial vehicle is applied to any of the above dual-circuit battery thermal management systems for a light commercial vehicle, and is characterized in that when a battery pack 17 outputs a cooling demand and a water temperature sensor 19 detects that the water temperature on the water inlet side of the battery pack 17 is 10<t≤15°C, the battery water pump 18 is turned on by the vehicle controller VCU, the three-way reversing valve 7 is switched to the low-temperature heat dissipation circuit, and the electronic fan 13 is turned on to realize coolant-air heat exchange, and the battery pack 17 is cooled under low load; when the water temperature sensor 19 detects that the water temperature on the water inlet side of the battery pack 17 is t≥15°C, the battery water pump 18 is kept working continuously, and the battery cooler chiller 6, the electronic fan 13, and the compressor 2 are turned on in sequence, and the coolant is cooled by the refrigerant heat exchange of the air-conditioning cooling circuit through the high-temperature heat dissipation circuit to cool the battery pack 17.

Claims

1. A dual-circuit battery thermal management system for a light commercial vehicle, characterized in that: The invention comprises a radiator assembly (20), wherein the radiator assembly (20) comprises a battery radiator (11), wherein the battery radiator (11) is connected to a battery chiller (6), a three-way reversing valve (7) and an air conditioning cooling circuit, wherein the three-way reversing valve (7) is respectively connected to a low-temperature heat dissipation circuit and a high-temperature heat dissipation circuit; the battery radiator (11) is connected to a battery water pump (18) and a battery pack (17) via the three-way reversing valve (7) to form a low-temperature heat dissipation circuit; the battery radiator (11) is connected to a battery water pump (18) and a battery pack (17) via the three-way reversing valve (7) to form a low-temperature heat dissipation circuit; and the battery radiator (11) is connected to a battery water pump (18) and a battery pack (17) via the three-way reversing valve (7). ) is connected to a battery cooler chiller (6), a battery water pump (18) and a battery pack (17) to form a high-temperature heat dissipation circuit; the battery cooler chiller (6) is connected to a refrigerant pipeline via a conversion joint, the refrigerant pipeline is connected to a refrigerant pressure and temperature sensor PT (5), and the refrigerant pressure and temperature sensor PT (5) is connected to a condenser (1) via a compressor (2) to form an air conditioning cooling circuit; a first expansion water tank (8) is connected between the three-way reversing valve (7) and the battery water pump (18).

2. The dual-circuit battery thermal management system for a light commercial vehicle as claimed in claim 1, characterized in that: The water outlet of the battery radiator (11) is connected to the battery water pump (18) and the battery pack (17) through the three-way reversing valve (7), and the battery pack (17) is connected to the water return port of the battery radiator (11) to form a low-temperature heat dissipation circuit; after the three-way reversing valve (7) is connected to the battery water pump (18), the battery pack (17) and the battery cooler chiller (6), the battery cooler chiller (6) is connected in series to the low-temperature heat dissipation circuit through the three-way reversing valve (7) to form the high-temperature heat dissipation circuit.

3. The dual-circuit battery thermal management system for a light commercial vehicle as claimed in claim 2, characterized in that: A water temperature sensor (19) is provided between the battery water pump (18) and the battery pack (17).

4. The dual-circuit battery thermal management system for a light commercial vehicle as claimed in claim 1, characterized in that: A refrigerant stop valve SOV (3) and an evaporator (4) are connected in parallel between the conversion joint and the compressor (2), and the refrigerant pipeline is fixed by a connecting pressure plate (21).

5. The dual-circuit battery thermal management system for a light commercial vehicle as claimed in claim 1, characterized in that: The radiator assembly (20) further comprises a motor radiator (10), the water outlet of the motor radiator (10) being respectively connected to a second expansion water tank (9) and a motor water pump (14), the motor water pump (14) being connected to a drive motor (16) via a five-in-one controller (15), and the drive motor (16) being connected to a water return port of the motor radiator (10), thereby forming a motor cooling circuit.

6. The dual-circuit battery thermal management system for a light commercial vehicle as claimed in claim 5, characterized in that: An electronic fan (13) is also provided at one end of the radiator assembly (20), and a wind shield (12) is provided at the other end of the radiator assembly (20).

7. A light commercial vehicle dual-circuit battery thermal management control method, applied to the light commercial vehicle dual-circuit battery thermal management system according to any one of claims 1 to 6, characterized in that: When the battery pack (17) outputs a cooling demand and the water temperature sensor (19) detects that the water temperature on the water inlet side of the battery pack (17) is 10<t≤15°C, the battery water pump (18) is turned on through the vehicle controller VCU, the three-way reversing valve (7) is switched to the low-temperature heat dissipation circuit, and the electronic fan (13) is turned on to achieve coolant-air heat exchange, thereby performing low-load heat dissipation on the battery pack (17); when the water temperature sensor (19) detects that the water temperature on the water inlet side of the battery pack (17) is t≥15°C, the battery water pump (18) is kept working continuously, and the battery chiller (6), the electronic fan (13), and the compressor (2) are turned on in sequence, and the coolant is heat-dissipated from the battery pack (17) through the high-temperature heat dissipation circuit and the refrigerant heat exchange of the air conditioning cooling circuit.

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