A battery thermal management system

Abstract

The utility model relates to a battery thermal management system, which belongs to the technical field of battery thermal management; the battery liquid cooling circuit includes a water pump, a battery heat exchanger and a liquid cooling side of a battery cooler connected in series in sequence, the battery refrigeration circuit includes a compressor, a condensing core, an expansion valve and a refrigerant side of a battery cooler connected in series in sequence, the condensing core is equipped with a fan, the output side of the battery heat exchanger is respectively connected to the liquid cooling side and the heat dissipation core of the battery cooler through a three-way valve, the other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler, and the heat dissipation core is also arranged in the air flow channel formed by the fan. The utility model cools down the higher outlet water temperature of the output side of the battery heat exchanger in advance through the heat dissipation core, so as to reduce the influence of the outlet water temperature on the refrigeration effect of the battery refrigeration circuit, and on the basis of realizing liquid cooling and heat exchange, it also improves the space utilization rate inside the battery thermal management system and effectively reduces the space occupation.

Description

Technical Field

[0001] The utility model relates to a battery thermal management system, belonging to the technical field of battery thermal management. Background Art

[0002] Compared with the high energy consumption and high pollution of traditional engineering vehicles, pure electric engineering vehicles are more economical and environmentally friendly, and are beginning to be valued and used by various countries.

[0003] As users have higher and higher requirements for the range and charging speed of pure electric engineering vehicles, the range and charging speed of pure electric engineering vehicles are improved by increasing the battery capacity of the pure electric engineering vehicles themselves, but the heat generated by the battery itself during operation is also increasing. Considering the high ambient temperature in summer, the temperature of the battery itself continues to rise during operation, which requires the battery thermal management system to take away the battery heat in time, otherwise it will not only reduce the efficiency of the battery itself, but also shorten the service life of the battery itself. In order to maximize the efficiency of the battery itself and improve the battery life, the temperature requirements for the battery itself during operation are also constantly increasing, which requires the improvement and optimization of the battery thermal management system.

[0004] Considering that when the vehicle is running, the higher water outlet temperature of the battery will affect the cooling effect of the refrigeration system in the battery thermal management system, the battery thermal management system is required to cool down the higher battery water outlet temperature in advance.

[0005] The battery thermal management system used in pure electric engineering vehicles adds a separate low-temperature radiator at the battery water outlet for heat exchange with the environment. The high battery water outlet temperature is lowered through the low-temperature radiator, which also improves the performance of the cooling system in the battery thermal management system.

[0006] However, as a separate component structure, the low-temperature radiator not only requires a relatively large installation space during installation, which makes the battery thermal management system structure complex and occupies a large amount of space after installation, but also significantly increases the cost due to the high cost of the various components of the low-temperature radiator. Utility Model Content

[0007] The utility model aims to provide a battery thermal management system to solve the problem of high space occupation after adding a low-temperature radiator to the existing battery thermal management system; and also provides a vehicle thermal management system to solve the problem of high space occupation after adding a low-temperature radiator to the battery thermal management system of the existing vehicle thermal management system.

[0008] To achieve the above purpose, the solution of the utility model includes:

[0009] The utility model provides a battery thermal management system, including a battery liquid cooling circuit and a battery refrigeration circuit. The battery liquid cooling circuit includes a water pump, a battery heat exchanger and a liquid cooling side of a battery cooler connected in series in sequence. The battery refrigeration circuit includes a compressor, a condensing core, an expansion valve and a refrigerant side of a battery cooler connected in series in sequence. The condensing core is provided with a fan. The output side of the battery heat exchanger is respectively connected to the liquid cooling side of the battery cooler and the heat dissipation core through a three-way valve. The other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler. The heat dissipation core is also arranged in an air flow channel formed by the fan.

[0010] Furthermore, the heat dissipation core and the condensation core are integrated.

[0011] Furthermore, a heat dissipation core and a condensation core are sequentially arranged along the airflow direction.

[0012] Furthermore, it also includes an expansion water tank connected to the battery liquid cooling circuit, and the expansion water tank is used to maintain the amount of liquid in the battery liquid cooling circuit.

[0013] Furthermore, the battery refrigeration circuit also includes a drying tube arranged between the condensing core and the expansion valve.

[0014] The utility model provides a vehicle thermal management system, including a battery thermal management system, the battery thermal management system including a battery liquid cooling circuit and a battery refrigeration circuit, the battery liquid cooling circuit including a water pump, a battery heat exchanger and a liquid cooling side of a battery cooler connected in series in sequence, the battery refrigeration circuit including a compressor, a condensing core, an expansion valve and a refrigerant side of a battery cooler connected in series in sequence, the condensing core is provided with a fan, the output side of the battery heat exchanger is respectively connected to the liquid cooling side of the battery cooler and the heat dissipation core through a three-way valve, the other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler, and the heat dissipation core is also arranged in an air flow channel formed by the fan.

[0015] Furthermore, the heat dissipation core and the condensation core are integrated.

[0016] Furthermore, a heat dissipation core and a condensation core are sequentially arranged along the airflow direction.

[0017] Furthermore, it also includes an expansion water tank connected to the battery liquid cooling circuit, and the expansion water tank is used to maintain the amount of liquid in the battery liquid cooling circuit.

[0018] Furthermore, the battery refrigeration circuit also includes a drying tube arranged between the condensing core and the expansion valve.

[0019] Beneficial effects of the utility model:

[0020] The utility model is an improved invention, which provides a battery thermal management system. By adding a three-way valve and a heat dissipation core in an existing battery liquid cooling circuit, the output side of a battery heat exchanger in the battery liquid cooling circuit is connected to the liquid cooling side of the battery cooler and the heat dissipation core respectively through the three-way valve, and the other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler. The heat dissipation core and the condensing core of the battery refrigeration circuit are both arranged in an air flow channel formed by a fan, so that the heat dissipation core and the condensing core share a fan. The high outlet water temperature on the output side of the battery heat exchanger can be cooled in advance through the heat dissipation core, and the outlet water temperature on the output side of the battery heat exchanger is reduced, so as to reduce the influence of the outlet water temperature on the refrigeration effect of the battery refrigeration circuit. On the basis of realizing liquid cooling and heat exchange, the space utilization rate inside the battery thermal management system is also improved, and the space occupancy is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a working principle diagram of the battery thermal management system of an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Compressor; 2. Condensation core; 3. Drying tube; 4. Expansion valve; 5. Battery cooler; 6. Water pump; 7. Battery heat exchanger; 8. Three-way valve; 9. Cooling core; 10. Fan; 11. Expansion tank. DETAILED DESCRIPTION

[0024] To solve the problems in the background technology, the utility model provides a battery thermal management system, which adds a three-way valve and a heat dissipation core to the existing battery liquid cooling circuit, so that the output side of the battery heat exchanger in the battery liquid cooling circuit is connected to the liquid cooling side of the battery cooler and the heat dissipation core respectively through the three-way valve, and the other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler. The heat dissipation core and the condensing core of the battery refrigeration circuit are both arranged in the air flow channel formed by the fan, so that the heat dissipation core and the condensing core share a fan, and the higher outlet water temperature on the output side of the battery heat exchanger can be cooled in advance through the heat dissipation core, and the outlet water temperature on the output side of the battery heat exchanger is reduced, so as to reduce the influence of the outlet water temperature on the refrigeration effect of the battery refrigeration circuit. On the basis of realizing liquid cooling and heat exchange, the space utilization rate inside the battery thermal management system is also improved, and the space occupancy is effectively reduced.

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] An embodiment of a battery thermal management system:

[0027] A battery thermal management system includes a battery liquid cooling circuit and a battery refrigeration circuit. The battery liquid cooling circuit includes a water pump, a battery heat exchanger and a liquid cooling side of a battery cooler connected in series in sequence. The battery refrigeration circuit includes a compressor, a condensing core, an expansion valve and a refrigerant side of a battery cooler connected in series in sequence. The condensing core is provided with a fan. The output side of the battery heat exchanger is respectively connected to the liquid cooling side of the battery cooler and a heat dissipation core for exchanging heat with the environment through a three-way valve. The other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler. The heat dissipation core is also arranged in an air flow channel formed by the fan.

[0028] Specifically, in order to further reduce space occupation, the heat dissipation core and the condensation core are integrated.

[0029] Specifically, in order to reduce the influence of the heat dissipation core on the condensation core, relevant tests have found that when the heat dissipation core and the condensation core are arranged in sequence along the airflow direction, the influence of the heat dissipation core on the condensation core is small. That is, when the heat dissipation core is arranged upstream of the fan in the airflow direction relative to the condensation core, the influence of the heat dissipation core on the condensation core is small.

[0030] Specifically, it also includes an expansion water tank connected to the battery liquid cooling circuit, and the expansion water tank is used to maintain the amount of liquid in the battery liquid cooling circuit.

[0031] Specifically, the battery refrigeration circuit also includes a drying tube arranged between the condensing core and the expansion valve, through which the gas output by the condensing core is dried to timely absorb moisture and impurities in the refrigeration cycle, thereby improving the refrigeration effect of the battery refrigeration circuit.

[0032] The working principle of the battery thermal management system is as follows Figure 1 As shown, the working mode is as follows:

[0033] Air conditioning refrigeration: The high-temperature and high-pressure refrigerant coming out of the compressor 1 enters the condensing core 2, then passes through the drying tube 3 and enters the expansion valve 4. After being throttled by the expansion valve 4, it enters the refrigerant side of the battery cooler 5, and then returns to the compressor 1 to perform a refrigeration cycle.

[0034] Liquid cooling cycle: the antifreeze flows out from the water pump 6 into the battery heat exchanger 7, and then the flow direction of the liquid cooling is changed through the three-way valve 8 at the three-way valve 8, that is, whether to perform low-temperature heat dissipation is selected through the three-way valve 8.

[0035] No low-temperature heat dissipation is performed: the water flows directly to the liquid-cooled side of the battery cooler 5 at the three-way valve 8 , and then flows back to the water pump 6 .

[0036] Low-temperature heat dissipation: the water first flows to the heat dissipation core 9 at the three-way valve 8 , and then flows back to the water pump 6 through the liquid cooling side of the battery cooler 5 .

[0037] The expansion water tank 11 is used to maintain the water level in the battery thermal management system when the ambient temperature changes.

[0038] The condensing core 2 and the heat dissipating core 9 share the same fan 10 . When the heat dissipating core 9 is arranged upstream of the condensing core 2 in the airflow direction of the fan 10 , the heat dissipating core 9 has relatively little influence on the condensing core 2 .

[0039] The utility model can select a suitable working mode according to the outlet water temperature of the battery heat exchanger, as follows:

[0040] When the outlet water temperature is high, low-temperature heat dissipation is performed first before the air conditioning is turned on. The high outlet water temperature on the output side of the battery heat exchanger 7 is cooled in advance through the heat dissipation core 9, and the outlet water temperature on the output side of the battery heat exchanger 7 is reduced to reduce the influence of the outlet water temperature on the refrigeration effect of the battery refrigeration circuit. On the basis of realizing liquid cooling and heat exchange, the space utilization rate inside the battery thermal management system is also improved, and the space occupancy is effectively reduced.

[0041] When the outlet water temperature is low, only low-temperature heat dissipation can be performed.

[0042] When the outlet water temperature is relatively moderate, neither too high nor too low, only air conditioning cooling can be performed.

[0043] The utility model integrates the refrigerant system and the core of the low-temperature radiator together, and realizes battery cooling by sharing a condensing fan as the fan 10 and the switching of the three-way valve, so as to meet multiple operating conditions of the pure electric engineering vehicle.

[0044] Compared with an independent low-temperature radiator, the utility model integrates the refrigerant system and the core of the low-temperature radiator, which not only reduces the demand for installation space, but also allows the fan 10 to be shared, thereby reducing costs.

[0045] The utility model integrates the core of the refrigerant system and the water system (liquid cooling system) into one body, and uses a common condenser fan to improve space utilization. When the ambient temperature is high, the battery is cooled by the low-temperature heat dissipation core in conjunction with the condensation core to ensure the efficiency and service life of the battery.

[0046] The utility model integrates the refrigerant core (condensation core) and the heat dissipation core into one core, and shares a condensing fan, so as to achieve simultaneous heat exchange between the refrigerant system and the water system, which can not only improve the low-temperature heat dissipation effect of the entire system, but also improve the space utilization rate inside the entire unit.

[0047] The number of battery heat exchangers, expansion water tanks and fans can be adjusted according to actual needs. The utility model can use different refrigerants. The expansion valve of the utility model can be an electronic expansion valve or a thermal expansion valve.

[0048] An embodiment of a vehicle thermal management system:

[0049] A vehicle thermal management system includes a battery thermal management system, wherein the battery thermal management system has been described in detail in an embodiment of a battery thermal management system and will not be described in detail here.

Claims

1. A battery thermal management system, comprising a battery liquid cooling circuit and a battery refrigeration circuit, wherein the battery liquid cooling circuit comprises a water pump, a battery heat exchanger and a liquid cooling side of a battery cooler connected in series, and the battery refrigeration circuit comprises a compressor, a condensing core, an expansion valve and a refrigerant side of a battery cooler connected in series, wherein the condensing core accelerates heat exchange with the environment through a fan, and is characterized in that: A three-way valve is also connected in series on the battery liquid cooling circuit. The three-way valve is arranged between the output side of the battery heat exchanger and the liquid cooling side of the battery cooler. The remaining end of the three-way valve is connected to a heat dissipation core. The other side of the heat dissipation core is connected to the liquid cooling side of the battery cooler. The heat dissipation core also accelerates heat exchange with the environment through the fan.

2. The battery thermal management system according to claim 1, characterized in that: The heat dissipation core and the condensation core are integrated.

3. The battery thermal management system according to claim 1 or 2, characterized in that: The heat dissipation core and the condensation core are arranged in sequence along the air flow direction of the fan.

4. The battery thermal management system according to claim 1, characterized in that: It also includes an expansion water tank connected to the battery liquid cooling circuit, and the expansion water tank is used to maintain the amount of liquid in the battery liquid cooling circuit.

5. The battery thermal management system according to claim 1, characterized in that: The battery refrigeration circuit also includes a drying tube connected in series between the condensing core and the expansion valve.

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