Battery pack cooling system and device

Abstract

The utility model discloses a battery pack cooling system and device.The battery pack cooling system comprises a circulating water pump, a compressor unit, a plate heat exchanger unit, a liquid supply pipeline, a liquid return pipeline and a pressure stabilizing assembly, one end of the liquid supply pipeline is connected with an outlet of the compressor unit, and the other end of the liquid supply pipeline is connected with a liquid supply connector; the plate heat exchanger set is connected to the liquid supply pipeline, one end of the liquid return pipeline is connected with an inlet of the compressor set, the other end of the liquid return pipeline is connected with a liquid return connector, the circulating water pump is installed on the liquid return pipeline, and the pressure stabilizing assembly is connected to the liquid return pipeline. According to the utility model, the compressor unit and the plate heat exchanger unit can work independently or work cooperatively according to requirements to dissipate heat of the battery pack, meanwhile, the pressure stabilizing assembly can maintain constant pressure and water quantity of the liquid return pipeline so as to buffer the capacity change of a cooling medium caused by temperature change, and an electric heater in the pressure stabilizing assembly can be used for heating the battery pack at a low environment temperature. And the battery reaches the temperature required by operation by heating the cooling medium.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack cooling, and more specifically, to a battery pack cooling system and device. Background Art

[0002] Generally, a battery generates a certain amount of heat whether in the charging state or the discharging state. When the heat is too high, the battery temperature will exceed the normal operating temperature range value, resulting in a decline in battery performance and a reduction in the cycle life. Therefore, it is necessary to cool the battery to an optimal state.

[0003] In the related art of battery cooling systems, most use air cooling or water cooling to cool the battery, with a single form and unable to be adjusted according to the actual situation. At the same time, the battery cooling system generally only cools the battery and cannot heat the battery. When the battery starts to operate in cold weather in winter, the battery temperature deviates from the optimal operating temperature, and the battery performance cannot be exerted to the best.

[0004] Therefore, a new solution is needed to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a battery pack cooling system and device.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A battery pack cooling system includes a circulating water pump, a compressor unit, a plate heat exchanger unit, a liquid supply pipeline, a liquid return pipeline, and a pressure stabilizing component. One end of the liquid supply pipeline is connected to the outlet of the compressor unit, the other end of the liquid supply pipeline is connected with a liquid supply interface, the plate heat exchanger unit is connected to the liquid supply pipeline, one end of the liquid return pipeline is connected to the inlet of the compressor unit, the other end of the liquid return pipeline is connected with a liquid return interface, the circulating water pump is installed on the liquid return pipeline, and the pressure stabilizing component is connected to the liquid return pipeline.

[0008] Further, the plate heat exchanger unit includes a plate heat exchanger and a filter. The cooling medium flow channel 1 of the plate heat exchanger is connected to the liquid supply pipeline. One end of the regenerated water flow channel of the plate heat exchanger is connected with a first pipeline, the end of the first pipeline is connected with a first interface, the other end of the regenerated water flow channel of the plate heat exchanger is connected with a second pipeline, the end of the second pipeline is connected with a second interface, the filter is installed on the second pipeline, the first pipeline is connected with a third pipeline and is connected to the second pipeline through the third pipeline, and an electric valve is installed on the third pipeline.

[0009] Further, a first temperature sensor and a pressure gauge are installed on the second pipeline.

[0010] Further, the compressor unit includes a compressor, a condenser, a liquid reservoir, and an evaporator. The outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the liquid reservoir, the outlet of the liquid reservoir is connected to one end of the coolant flow channel of the evaporator, the other end of the coolant flow channel of the evaporator is connected to the inlet of the compressor, one end of the second cooling medium flow channel of the evaporator is connected to a liquid outlet pipe, and is connected to one end of a liquid supply pipe through the liquid outlet pipe. The other end of the second cooling medium flow channel of the evaporator is connected to a liquid inlet pipe, and is connected to one end of a liquid return pipe through the liquid inlet pipe.

[0011] Further, the pressure stabilizing assembly includes a degassing tank and an expansion tank. The degassing tank and the expansion tank are arranged along the flowing direction of the cooling medium in the liquid return pipe, and an electric heater is installed on the degassing tank.

[0012] Further, the liquid return pipe is connected with a liquid supplement branch. The liquid supplement branch includes a liquid supplement pump. The output end of the liquid supplement pump is connected with a check valve and is connected to the liquid return pipe through the check valve.

[0013] Further, a second temperature sensor and a first pressure sensor are installed on the liquid supply pipe, and a third temperature sensor and a second pressure sensor are installed on the liquid return pipe.

[0014] The present utility model also provides a battery pack cooling device, which includes a frame, a controller, and the above-mentioned battery pack cooling system. The controller is installed on the frame and is electrically connected to the battery pack cooling system. The battery pack cooling system is installed on the frame.

[0015] The beneficial effects of the present utility model are as follows: In the present utility model, the compressor unit and the plate heat exchanger unit can work independently or cooperate with each other according to requirements to dissipate heat from the battery pack. At the same time, the pressure stabilizing assembly can maintain a constant pressure and water volume in the liquid return pipe to buffer the volume change of the cooling medium caused by temperature change. The electric heater in the pressure stabilizing assembly can heat the cooling medium at a low ambient temperature to make the battery reach the required operating temperature. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the battery pack cooling system in this embodiment;

[0017] Figure 2 It is a schematic structural diagram of the compressor unit in this embodiment;

[0018] Figure 3 It is a schematic structural diagram of the plate heat exchanger unit in this embodiment;

[0019] Figure 4 It is a schematic structural diagram of the battery pack cooling device in this embodiment.

[0020] Reference numerals: circulating water pump 1, compressor unit 2, compressor 201, condenser 202, liquid storage tank 203, evaporator 204, coolant flow channel 205, second cooling medium flow channel 206, liquid outlet pipeline 207, liquid inlet pipeline 208, plate heat exchanger group 3, plate heat exchanger 301, first cooling medium flow channel 302, regenerated water flow channel 303, first pipeline 304, first interface 305, second pipeline 306, second interface 307, third pipeline 308, electric valve 309, first temperature sensor 310, pressure gauge 311, filter 312, liquid supply pipeline 4, liquid return pipeline 5, pressure stabilizing component 6, degassing tank 601, expansion tank 602, electric heater 603, liquid supply interface 7, liquid return interface 8, liquid supplement branch 9, liquid supplement pump 901, check valve 902, second temperature sensor 10, first pressure sensor 11, third temperature sensor 12, second pressure sensor 13, frame 14, battery pack cooling system 15, controller 16. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment: A battery pack cooling system, as Figures 1-3 shown, includes a circulating water pump 1, a compressor unit 2, a plate heat exchanger group 3, a liquid supply pipeline 4, a liquid return pipeline 5, and a pressure stabilizing component 6. One end of the liquid supply pipeline 4 is connected to the outlet of the compressor unit 2, and the other end of the liquid supply pipeline 4 is connected to a liquid supply interface 7. The plate heat exchanger group 3 is connected to the liquid supply pipeline 4. One end of the liquid return pipeline 5 is connected to the inlet of the compressor unit 2, and the other end of the liquid return pipeline 5 is connected to a liquid return interface 8. The circulating water pump 1 is installed on the liquid return pipeline 5, and the pressure stabilizing component 6 is connected to the liquid return pipeline 5.

[0023] During use, the liquid supply interface 7 and the liquid return interface 8 are respectively connected to the heat dissipation flow channel of the battery pack, so as to form a closed circulating water path among the circulating water pump 1, the compressor unit 2, the plate heat exchanger group 3, the liquid supply pipeline 4, the liquid return pipeline 5, the pressure stabilizing component 6, and the heat dissipation flow channel of the battery pack. The cooling medium of the cooling system is 20% ethylene glycol solution, which is pumped by the circulating water pump 1. The cooling medium flows to the heat dissipation flow channel of the battery pack after being cooled by the compressor unit 2 and the plate heat exchanger group 3, and the battery pack is cooled through heat exchange. The heated cooling medium is pumped by the circulating water pump 1 to the compressor unit 2 and the plate heat exchanger group 3 for cooling, and circulates in this way repeatedly. The circulating water pump 1 is a centrifugal pump, with a flow rate of 5 m3 / h and a head of 25 m.

[0024] Among them, the compressor unit 2 and the plate heat exchanger unit 3 can work independently or in cooperation according to requirements. For example, at normal ambient temperature (25 °C), only the plate heat exchanger unit 3 operates to cool the battery pack; when the ambient temperature is too high, or the temperature of the regenerated water in the plate heat exchanger unit 3 is too high, or during the maintenance of the plate heat exchanger unit 3, the compressor unit 2 can be operated to cool the battery pack. The pressure stabilizing component 6 is used to maintain a constant pressure and water volume in the return liquid pipeline to buffer the volume change of the cooling medium caused by temperature changes.

[0025] Furthermore, as Figure 3 shown, the plate heat exchanger unit 3 includes a plate heat exchanger 301 and a filter 312. The plate heat exchanger 301 has a first cooling medium flow channel 302 and a regenerated water flow channel 303. The first cooling medium flow channel 302 of the plate heat exchanger 301 is connected to the liquid supply pipeline 4. One end of the regenerated water flow channel 303 of the plate heat exchanger 301 is connected to a first pipeline 304, and the end of the first pipeline 304 is connected to a first interface 305. The other end of the regenerated water flow channel 303 of the plate heat exchanger 301 is connected to a second pipeline 306, and the end of the second pipeline 306 is connected to a second interface 307. The filter 312 is installed on the second pipeline 306. The first pipeline 304 is connected to a third pipeline 308 and is connected to the second pipeline 306 through the third pipeline 308, that is, both ends of the third pipeline 308 are respectively connected to the first pipeline 304 and the second pipeline 306, and an electric valve 309 is installed on the third pipeline 308.

[0026] During use, the second interface 307 on the second pipeline 306 is connected to the interface of the regenerated water pipe, and the first interface 305 on the first pipeline 304 is connected to the interface of the biological reaction tank. The regenerated water pipe introduces regenerated water, and the regenerated water flows to the filter 312 by its own pressure. After being filtered by the filter 312 to remove impurities, it enters the regenerated water flow channel 303 of the plate heat exchanger 301, and cools the heated cooling medium in the first cooling medium flow channel 302 through heat exchange. The heated regenerated water is injected into the biological reaction tank through the first pipeline 304, and circulates in this way repeatedly. Among them, the electric valve 309 is an electric proportional valve, which is used to adjust the flow rate of the regenerated water flowing to the plate heat exchanger 301.

[0027] Preferably, a first temperature sensor 310 and a pressure gauge 311 are installed on the second pipeline 306. The first temperature sensor 310 is used to monitor the water temperature of the regenerated water, and the pressure gauge 311 is used to locally display the water pressure of the regenerated water in the second pipeline 306.

[0028] Preferably, shut-off valves are connected to the four ports of the plate heat exchanger 301 and the filter 312, which is convenient for maintenance.

[0029] Preferably, two plate heat exchangers 301 are provided, one for use and one for standby. Correspondingly, two filters 312 are also provided, one for use and one for standby. One plate heat exchanger 301 and the corresponding filter 312 are connected in parallel with the other plate heat exchanger 301 and the corresponding filter 312. Each path can meet the system cooling requirement and enable the system to operate without shutdown during maintenance.

[0030] Further, as Figure 2 shown, the compressor unit 2 includes a compressor 201, a condenser 202, a liquid receiver 203, and an evaporator 204. The outlet of the compressor 201 is connected to the inlet of the condenser 202. The outlet of the condenser 202 is connected to the inlet of the liquid receiver 203. The outlet of the liquid receiver 203 is connected to one end of the coolant flow channel 205 of the evaporator 204. The evaporator 204 has a coolant flow channel 205 and a cooling medium flow channel 206. The other end of the coolant flow channel 205 of the evaporator 204 is connected to the inlet of the compressor 201. One end of the cooling medium flow channel 206 of the evaporator 204 is connected to a liquid outlet pipe 207 and is connected to one end of the liquid supply pipe 4 through the liquid outlet pipe 207. The other end of the cooling medium flow channel 206 of the evaporator 204 is connected to a liquid inlet pipe 208 and is connected to one end of the liquid return pipe 5 through the liquid inlet pipe 208.

[0031] When the ambient temperature is too high, or the temperature of the regenerated water of the plate heat exchanger group 3 is too high, or during the maintenance of the plate heat exchanger group 3, the compressor unit 2 can be operated to cool the battery pack. During use, the coolant in the liquid receiver 203 flows into the coolant flow channel 205 of the evaporator 204, and the cooling medium in the cooling medium flow channel 206 is cooled through heat exchange. The heated coolant is transported to the condenser 202 by the compressor 201 and returns to the liquid receiver 203 after being cooled by the condenser 202. The condenser 202 is equipped with a condensing fan, and the condensing fan can blow air to the condenser 202 to cool the coolant flowing to the condenser 202.

[0032] Further, as Figure 1 shown, the voltage stabilizing component 6 includes a degassing tank 601 and an expansion tank 602, which are arranged along the direction of the cooling medium flow channel in the liquid return pipe 5. When the battery pack is working, a certain electric field will be generated. When the cooling medium flows to the heat dissipation flow channel of the battery pack, part of the water is ionized. Therefore, the return flow of the cooling medium is reduced. At the same time, when it is first operated, there is air in the loop. By setting the degassing tank 601, it is used to remove the air in the loop and play a role in separating gas and water; by setting the expansion tank 602, it is used to supplement the cooling medium and stabilize the voltage in the liquid return pipe 5.

[0033] Preferably, an electric heater 603 is installed on the degassing tank 601. The electric heater 603 is used to heat the cooling medium to enable the battery to reach the required operating temperature at low ambient temperatures.

[0034] The expansion tank 602 is a bladder type expansion tank 602, and nitrogen gas with a certain pressure is filled between the airbag and the tank body. By setting the expansion tank 602, on the one hand, it is to ensure that the entire cooling system always maintains a sufficient amount of circulating water when the temperature changes, water is consumed, and there is a slight leakage. During normal circulation, the cooling medium enters the internal airbag of the expansion tank 602, compressing the nitrogen gas in the tank. When the water in the system is lost, the nitrogen gas expands to make up for the water; on the other hand, it maintains a constant pressure in the return liquid pipeline 5. When the volume of the cooling medium in the return liquid pipeline 5 changes, the nitrogen gas automatically expands or contracts to keep the cooling medium at a constant pressure.

[0035] Furthermore, a liquid supplement branch 9 is connected to the return liquid pipeline 5. The liquid supplement branch 9 includes a liquid supplement pump 901. The output end of the liquid supplement pump 901 is connected with a check valve 902 and is connected to the return liquid pipeline 5 through the check valve 902. By setting the liquid supplement pump 901, when the pressure in the return liquid pipeline 5 is too low, liquid can be supplemented and the pressure can be increased through the liquid supplement pump 901.

[0036] A second temperature sensor 10 and a first pressure sensor 11 are installed on the liquid supply pipeline 4. The second temperature sensor 10 is used to detect the water temperature of the cooling medium in the liquid supply pipeline 4; the first pressure sensor 11 is used to detect the water pressure of the cooling medium in the liquid supply pipeline 4.

[0037] A third temperature sensor 12 and a second pressure sensor 13 are installed on the return liquid pipeline 5. The third temperature sensor 12 is used to detect the water temperature of the cooling medium in the return liquid pipeline 5; the second pressure sensor 13 is used to detect the water pressure of the cooling medium in the return liquid pipeline 5.

[0038] This embodiment also provides a battery pack cooling device, as Figure 4 shown, including a frame 14, a controller 16, and the above-mentioned battery pack cooling system 15. The controller is installed on the frame 14 and is electrically connected to the battery pack cooling system 15. The battery pack cooling system 15 is installed on the frame 14.

[0039] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A battery pack cooling system, characterized in that: The invention comprises a circulating water pump (1), a compressor unit (2), a plate heat exchanger unit (3), a liquid supply pipeline (4), a liquid return pipeline (5), and a pressure stabilizing component (6); one end of the liquid supply pipeline (4) is connected to the outlet of the compressor unit (2), and the other end of the liquid supply pipeline (4) is connected to a liquid supply interface (7); the plate heat exchanger unit (3) is connected to the liquid supply pipeline (4); one end of the liquid return pipeline (5) is connected to the inlet of the compressor unit (2), and the other end of the liquid return pipeline (5) is connected to a liquid return interface (8); the circulating water pump (1) is installed on the liquid return pipeline (5), and the pressure stabilizing component (6) is connected to the liquid return pipeline (5).

2. A battery pack cooling system according to claim 1, characterized in that: The plate heat exchanger group (3) comprises a plate heat exchanger (301) and a filter (312); a cooling medium flow channel (302) of the plate heat exchanger (301) is connected to a liquid supply pipeline (4); one end of a regeneration water flow channel (303) of the plate heat exchanger (301) is connected to a first pipeline (304); the end of the first pipeline (304) is connected to a first interface (305); the other end of the regeneration water flow channel (303) of the plate heat exchanger (301) is connected to a second pipeline (306); the end of the second pipeline (306) is connected to a second interface (307); the filter (312) is installed on the second pipeline (306); the first pipeline (304) is connected to a third pipeline (308) and is connected to the second pipeline (306) via the third pipeline (308); an electric valve (309) is installed on the third pipeline (308).

3. A battery pack cooling system according to claim 2, characterized in that: A first temperature sensor (310) and a pressure gauge (311) are installed on the second pipeline (306).

4. A battery pack cooling system according to claim 1, characterized in that: The compressor unit (2) comprises a compressor (201), a condenser (202), a liquid reservoir (203), and an evaporator (204); the outlet of the compressor (201) is connected to the inlet of the condenser (202); the outlet of the condenser (202) is connected to the inlet of the liquid reservoir (203); the outlet of the liquid reservoir (203) is connected to one end of a cooling liquid flow channel (205) of the evaporator (204); The other end of the cooling medium flow channel (205) is connected to the inlet of the compressor (201); one end of the second cooling medium flow channel (206) of the evaporator (204) is connected to a liquid outlet pipeline (207), and is connected to one end of the liquid supply pipeline (4) through the liquid outlet pipeline (207); the other end of the second cooling medium flow channel (206) of the evaporator (204) is connected to a liquid inlet pipeline (208), and is connected to one end of the liquid return pipeline (5) through the liquid inlet pipeline (208).

5. A battery pack cooling system according to claim 1, characterized in that: The voltage stabilizing component (6) comprises a degassing tank (601) and an expansion tank (602), wherein the degassing tank (601) and the expansion tank (602) are arranged along the flow direction of the cooling medium in the liquid return pipeline (5), and an electric heater (603) is installed on the degassing tank (601).

6. A battery pack cooling system according to claim 1, characterized in that: The liquid return pipeline (5) is connected to a liquid infusion branch (9), and the liquid infusion branch (9) comprises a liquid infusion pump (901). The output end of the liquid infusion pump (901) is connected to a check valve (902), and is connected to the liquid return pipeline (5) via the check valve (902).

7. A battery pack cooling system according to claim 1, characterized in that: A second temperature sensor (10) and a first pressure sensor (11) are installed on the liquid supply pipeline (4), and a third temperature sensor (12) and a second pressure sensor (13) are installed on the liquid return pipeline (5).

8. A battery pack cooling device, characterized in that: The invention comprises a frame (14), a controller (16), and a battery pack cooling system (15) as claimed in any one of claims 1 to 7, wherein the controller (16) is mounted on the frame (14) and is electrically connected to the battery pack cooling system (15), and the battery pack cooling system (15) is mounted on the frame (14).

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