Battery thermal management water cooling unit for ultralow temperature environment

Abstract

The utility model discloses a battery thermal management water cooling unit for an ultralow-temperature environment, and belongs to the technical field of battery cooling. Comprising a cooling plate arranged on the outer side of a power battery, the liquid outlet pipe end of the cooling plate is connected with a water pump, the liquid outlet end of the water pump is connected with an electromagnetic three-way valve, one outlet end of the electromagnetic three-way valve is connected with a unit cooling loop, and the other outlet end of the electromagnetic three-way valve is connected with a heat dissipation cooling loop. A liquid outlet of the unit cooling loop and a liquid outlet of the heat dissipation cooling loop are communicated with a liquid inlet pipe of the cooling plate through a three-way connector; when the environment temperature is lower than minus 20 DEG C, the electromagnetic three-way valve switches the heat dissipation cooling loop to be communicated with the cooling plate, and the unit cooling loop stops working, and when the environment temperature is higher than minus 20 DEG C, the electromagnetic three-way valve switches the unit cooling loop to be communicated with the cooling plate, and the heat dissipation cooling loop stops working. According to the utility model, the power battery can still be cooled in a low-temperature environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery cooling, and in particular relates to a battery thermal management water cooling unit used in an ultra-low temperature environment. Background Art

[0002] At present, new energy is an important direction for the future development of the construction machinery field. On the one hand, it is due to policy guidance. Under the guidance of the country's "dual carbon strategy", the construction machinery industry is gradually moving towards clean, electrified and high-tech. On the other hand, it is market stimulation. New energy mixer trucks, new energy loaders, new energy excavators, new energy forklifts and other types of construction machinery products have entered the market in a high-profile manner, making construction machinery products move towards new energy.

[0003] Along with it comes the battery thermal management unit. It is well known that battery packs generate heat (reaction heat, Joule heat, polarization heat) during the charging and discharging process. If the operating temperature of the battery pack cannot be effectively controlled (25℃ ~ 40℃ is appropriate), it will lead to thermal runaway of the battery pack, which will affect the life of the battery at the least and the operating safety of the vehicle / equipment at the worst. Therefore, the battery thermal management system came into being. The battery thermal management system receives feedback on the battery cell temperature from the power battery management system, and determines the unit's operating mode through the battery thermal management system controller, thereby accurately controlling the water inlet temperature entering the battery pack and ensuring that the battery pack operates at an appropriate temperature.

[0004] However, in some northwestern regions, the temperature difference between day and night is large, and the temperature at night can even reach minus 30 degrees Celsius. The battery pack works in such an ambient temperature, and the compressor, an important component of the ordinary thermal management water cooling unit, cannot meet the cooling needs of the battery pack. Utility Model Content

[0005] Purpose of the utility model: to provide a battery thermal management water cooling unit for ultra-low temperature environment, which solves the above-mentioned problems existing in the prior art.

[0006] Technical solution: A battery thermal management water cooling unit for ultra-low temperature environment, including a cooling plate, which is arranged on the outside of the power battery, the liquid outlet pipe end is connected to a water pump, the liquid outlet end of the water pump is connected to an electromagnetic three-way valve, one outlet end of the electromagnetic three-way valve is connected to the unit cooling circuit, and the other outlet end of the electromagnetic three-way valve is connected to the heat dissipation cooling circuit. The liquid outlet of the unit cooling circuit and the liquid outlet of the heat dissipation cooling circuit are connected to the liquid inlet pipe of the cooling plate through a three-way connector; when the ambient temperature is lower than minus 20°C, the electromagnetic three-way valve switches the heat dissipation cooling circuit to connect to the cooling plate, and the unit cooling circuit stops working; when the ambient temperature is higher than minus 20°C, the electromagnetic three-way valve switches the unit cooling circuit to connect to the cooling plate, and the heat dissipation cooling circuit stops working.

[0007] Preferably, the cooling circuit of the unit includes a plate heat exchanger, a first input end of the plate heat exchanger is connected to an outlet end of an electromagnetic three-way valve through a pipeline, a first output end of the plate heat exchanger is connected to a condenser in cooperation with a compressor, an output end of the condenser is connected to a second input end of the plate heat exchanger through an expansion valve, and a second output end of the plate heat exchanger is connected to a cooling plate through a three-way connector.

[0008] Preferably, the cooling circuit of the unit further includes a pressure sensor, and the pressure sensor is installed between the condenser and the expansion valve.

[0009] Preferably, the heat dissipation cooling circuit includes a water inlet pipe, which is connected to the outlet end of the electromagnetic three-way valve, and the water inlet pipe is connected to a heat dissipation water tank, in which a filter, a heat sink and a heat dissipation core are installed, and the heat dissipation water tank is connected to a water outlet pipe, and the water outlet pipe is connected to a three-way connector.

[0010] Preferably, a first temperature sensor is installed on the liquid outlet pipe of the cooling plate, and the first temperature sensor is used to measure the temperature of the coolant in the liquid outlet pipe. A second temperature sensor is installed on the liquid inlet pipe of the cooling plate, and the second temperature sensor is used to measure the temperature of the coolant in the liquid inlet pipe.

[0011] Preferably, it also includes a cooling fan, which is connected to an external power supply and is used to dissipate heat from the unit cooling circuit and the heat dissipation cooling circuit or to remove dust from the unit cooling circuit and the heat dissipation cooling circuit.

[0012] Beneficial effects: The utility model relates to a battery thermal management water cooling unit for ultra-low temperature environments. The electromagnetic three-way valve is adjusted according to the ambient temperature. When the ambient temperature is suitable for the unit cooling circuit to work, the cooling plate is connected to the unit cooling circuit under the action of the electromagnetic three-way valve, and the power battery is cooled by the unit cooling circuit and the cooling plate. When the ambient temperature is too low and the unit cooling circuit cannot operate, the cooling plate is connected to the heat dissipation cooling circuit under the action of the electromagnetic three-way valve to meet the heat dissipation needs of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 1 The figures are marked as follows: 1. cooling plate; 2. water pump; 3. electromagnetic three-way valve; 4. unit cooling circuit; 5. heat dissipation cooling circuit; 6. three-way connector; 7. first temperature sensor; 8. second temperature sensor; 9. cooling fan; 41. plate heat exchanger; 42. first input end; 43. first output end; 44. second input end; 45. second output end; 46. condenser; 47. expansion valve; 48. pressure sensor; 49. compressor. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, the utility model provides a technical solution: a battery thermal management water cooling unit for ultra-low temperature environment comprises a cooling plate 1, a water pump 2, a battery three-way valve, a unit cooling circuit 4, a heat dissipation cooling circuit 5 and a heat dissipation fan 9, wherein the cooling plate 1 is placed outside the power battery, the liquid outlet pipe end of the cooling plate 1 is connected to the water pump 2, the liquid outlet end of the water pump 2 is connected to the electromagnetic three-way valve 3, one outlet end of the electromagnetic three-way valve 3 is connected to the unit cooling circuit 4, the other outlet end of the electromagnetic three-way valve 3 is connected to the heat dissipation cooling circuit 5, the liquid outlet of the unit cooling circuit 4 and the liquid outlet of the heat dissipation cooling circuit 5 are connected to the cooling plate 1 through a three-way connector 6. The liquid inlet pipe is connected, a first temperature sensor 7 is installed on the liquid outlet pipe of the cooling plate 1, and a second temperature sensor 8 is installed on the liquid inlet pipe of the cooling plate 1. The cooling fan 9 is used to dissipate heat for the unit cooling circuit 4 and the heat dissipation cooling circuit 5. In this embodiment, the cooling fan 9 adopts an electronically controlled brushless DC motor, PWM speed control, and has forward and reverse functions. When the cooling fan 9 is operated in a forward rotation mode, the unit cooling circuit 4 and the heat dissipation cooling circuit 5 are sucked and dissipated. When the cooling fan 9 is operated in a reverse mode, the outer surfaces of the unit cooling circuit 4 and the heat dissipation cooling circuit 5 can be dust-removed and cleaned.

[0016] In a further embodiment, the unit cooling circuit 4 includes a plate heat exchanger 41, a first input end 42 of the plate heat exchanger 41 is connected to an outlet end of the electromagnetic three-way valve 3 through a pipeline, a first output end 43 of the plate heat exchanger 41 is connected to a condenser 46 in cooperation with a compressor 49, an output end of the condenser 46 is connected to a second input end 44 of the plate heat exchanger 41 through an expansion valve 47, a pressure sensor 48 is installed between the condenser 46 and the expansion valve 47, and a second output end 45 of the plate heat exchanger 41 is connected to a cooling plate 1 through a three-way connector 6. After the coolant in the cooling plate 1 absorbs the heat of the power battery, it flows into the plate heat exchanger 41 and flows into the condenser 46 through the compressor 49. The expansion valve 47 is cooperated to flow the cooled coolant into the plate heat exchanger 41, and the cooled coolant is transported to the cooling plate 1 through a three-way connector connected to the plate radiator, so that the coolant is circulated to dissipate heat for the power battery.

[0017] In a further embodiment, the heat dissipation cooling circuit 5 includes a water inlet pipe, which is connected to the outlet end of the electromagnetic three-way valve 3, and the water inlet pipe is connected to a heat dissipation water tank. The heat dissipation water tank is equipped with a filter, a heat sink and a heat dissipation core. The heat dissipation water tank is connected to a water outlet pipe, and the water outlet pipe is connected to a three-way connector 6. The liquid inlet end of the radiator is connected to an outlet end of the electromagnetic three-way valve 3, and the liquid outlet end of the radiator is connected to the three-way connector. The coolant that absorbs the heat of the power battery enters the radiator under the control of the electromagnetic three-way valve 3, and the coolant is cooled by the radiator. The cooled coolant flows into the cooling plate 1 through the three-way connector 6 to dissipate heat from the power battery.

[0018] In a further embodiment, a second temperature sensor 8 and a first temperature sensor 7 are respectively installed at the liquid inlet and liquid outlet of the cooling plate 1, and the first temperature sensor 7 and the second temperature sensor 8 are used to monitor the temperature of the coolant at the liquid inlet and liquid outlet, and the first temperature sensor 7 and the second temperature sensor 8 are used to obtain the temperature difference between the inlet and outlet of the cooling plate 1 to monitor the cooling effect on the power battery.

[0019] The current ambient temperature is obtained by obtaining the signal of the external ambient temperature sensor. When the ambient temperature is lower than minus 20°C, the electromagnetic three-way valve 3 switches the heat dissipation cooling circuit 5 to connect to the cooling plate 1, and the unit cooling circuit 4 stops working. The coolant is cooled by the radiator in the heat dissipation cooling circuit 5 to cool the power battery.

[0020] When the ambient temperature is higher than minus 20°C, the electromagnetic three-way valve 3 switches the unit cooling circuit 4 to connect to the cooling plate 1, and the heat dissipation cooling circuit 5 stops working. At this time, with the cooperation of the compressor 49 and the condenser 46, the coolant is cooled, and the pressure sensor 48 is used to detect the pressure of the output coolant. The cooled coolant is then transported to the plate heat exchanger 41 through the expansion valve 47, and the cooled coolant is transported to the cooling plate 1 through the plate heat exchanger 41 to cool the power battery.

[0021] Depending on the ambient temperature, the cooling medium should be ethylene glycol antifreeze with a suitable volume ratio according to the extreme low temperature of the application area.

[0022] That is, no matter in a low temperature environment below minus 20°C or in an environment above minus 20°C, the power battery can be cooled down normally, avoiding the situation in which the compressor 49 cannot work normally in a low temperature environment, resulting in the inability to cool the power battery.

[0023] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A battery thermal management water cooling unit for ultra-low temperature environment, characterized in that: The invention comprises a cooling plate (1) arranged outside a power battery, wherein a liquid outlet pipe end of the cooling plate (1) is connected to a water pump (2), a liquid outlet end of the water pump (2) is connected to an electromagnetic three-way valve (3), one outlet end of the electromagnetic three-way valve (3) is connected to a unit cooling circuit (4), and the other outlet end of the electromagnetic three-way valve (3) is connected to a heat dissipation cooling circuit (5), and a liquid outlet of the unit cooling circuit (4) and a liquid outlet of the heat dissipation cooling circuit (5) are connected to a liquid inlet pipe of the cooling plate (1) through a three-way connector (6); when the ambient temperature is lower than minus 20°C, the electromagnetic three-way valve (3) switches the heat dissipation cooling circuit (5) to connect to the cooling plate (1), and the unit cooling circuit (4) stops working; when the ambient temperature is higher than minus 20°C, the electromagnetic three-way valve (3) switches the unit cooling circuit (4) to connect to the cooling plate (1), and the heat dissipation cooling circuit (5) stops working.

2. A battery thermal management water cooling unit for ultra-low temperature environment according to claim 1, characterized in that: The unit cooling circuit (4) comprises a plate heat exchanger (41), a first input end (42) of the plate heat exchanger (41) is connected to an outlet end of an electromagnetic three-way valve (3) through a pipeline, a first output end (43) of the plate heat exchanger (41) is connected to a condenser (46) in cooperation with a compressor (49), an output end of the condenser (46) is connected to a second input end (44) of the plate heat exchanger (41) through an expansion valve (47), and a second output end (45) of the plate heat exchanger (41) is connected to a cooling plate (1) through a three-way connector (6).

3. A battery thermal management water cooling unit for ultra-low temperature environment according to claim 2, characterized in that: The unit cooling circuit (4) further comprises a pressure sensor (48), wherein the pressure sensor (48) is installed between the condenser (46) and the expansion valve (47).

4. The battery thermal management water cooling unit for ultra-low temperature environment according to claim 1, characterized in that: The heat dissipation cooling circuit (5) comprises a water inlet pipe, the water inlet pipe is connected to the outlet end of the electromagnetic three-way valve (3), the water inlet pipe is connected to a heat dissipation water tank, a filter, a heat sink and a heat dissipation core are installed in the heat dissipation water tank, the heat dissipation water tank is connected to a water outlet pipe, and the water outlet pipe is connected to a three-way connector (6).

5. The battery thermal management water cooling unit for ultra-low temperature environment according to claim 1, characterized in that: A first temperature sensor (7) is installed on the liquid outlet pipe of the cooling plate (1), and the first temperature sensor (7) is used to measure the temperature of the coolant in the liquid outlet pipe. A second temperature sensor (8) is installed on the liquid inlet pipe of the cooling plate (1), and the second temperature sensor (8) is used to measure the temperature of the coolant in the liquid inlet pipe.

6. The battery thermal management water cooling unit for ultra-low temperature environment according to claim 1, characterized in that: It also includes a cooling fan (9), the cooling fan (9) being connected to an external power supply, and the cooling fan (9) being used to dissipate heat from the unit cooling circuit (4) and the heat dissipation cooling circuit (5) or to remove dust from the unit cooling circuit (4) and the heat dissipation cooling circuit (5).

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