High-efficiency and energy-saving liquid cooling unit for container type energy storage system

Abstract

The utility model discloses an efficient and energy-saving liquid cooling unit for a container type energy storage system, which comprises a third plate heat exchanger, the secondary side of the third plate heat exchanger is connected with a battery pack cooling circulation liquid supply loop, and the primary side of the third plate heat exchanger is connected with a water cooling refrigeration loop. A first plate heat exchanger is connected in series between the battery pack cooling circulation liquid supply loop and the third plate heat exchanger, and the secondary side of the first plate heat exchanger is connected with a cooling water source. The cooling liquid firstly enters the first plate heat exchanger for heat exchange and cooling and then enters the third plate heat exchanger for heat exchange with a refrigerating loop on the secondary side of the third plate heat exchanger, and secondary cooling of the cooling liquid is achieved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage refrigeration unit technology, specifically a liquid refrigeration unit for a high-efficiency and energy-saving containerized energy storage system. Background Technology

[0002] Air-cooled liquid chillers can operate without external piping and provide a continuous supply of coolant to the energy storage battery pack. However, in high-temperature and high-altitude areas, the excessively high air temperatures (above 45°C) or thin air (above 3000 meters altitude) often prevent air-cooled liquid chillers from achieving the required cooling capacity. Therefore, containerized energy storage systems must be used at reduced frequencies (reduced charging and discharging current) in high-temperature and high-altitude areas to minimize battery heat generation. Otherwise, temperature runaway caused by the reduced cooling capacity of the liquid chiller could trigger a disastrous chain reaction.

[0003] The "off-grid power supply characteristics" of energy storage systems are precisely the technology urgently needed in remote, high-temperature, and high-altitude areas. However, the current "poor adaptability" of energy storage systems to high-temperature and high-altitude environments has become a "bottleneck" for the application of the technology and is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency and energy-saving liquid-cooled unit for a containerized energy storage system. The first plate heat exchanger is connected to the primary side of the third plate heat exchanger, so that the coolant first enters the first plate heat exchanger for heat exchange and cooling, and then enters the third plate heat exchanger to exchange heat with the refrigeration circuit on the secondary side of the third plate heat exchanger, thereby achieving a second cooling of the coolant. Through dual cooling, the temperature range of the coolant after cooling is guaranteed, ensuring that the battery pack operates within the optimal operating range.

[0005] This utility model provides the following technical solution: a high-efficiency and energy-saving liquid-cooled unit for a containerized energy storage system, comprising a third plate heat exchanger, wherein a battery pack cooling circulation supply circuit is connected to the primary side of the third plate heat exchanger, a water-cooled refrigeration circuit is connected to the secondary side of the third plate heat exchanger, a second plate heat exchanger is connected within the water-cooled refrigeration circuit, a cooling water source is connected to the secondary side of the second plate heat exchanger, a first plate heat exchanger is connected in series between the battery pack cooling circulation supply circuit and the third plate heat exchanger, the battery pack cooling circulation supply circuit includes a supply port and a return port, the supply port is connected to the third plate heat exchanger, the return port is connected to the first plate heat exchanger, and a cooling water source is connected to the primary side of the first plate heat exchanger.

[0006] To cool the primary side of the third plate heat exchanger, a compressor and an electronic expansion valve are connected between the second and third plate heat exchangers. The compressor and the electronic expansion valve are located on two separate pipelines. The cooling water source is connected to an inlet and an outlet, which are connected to the secondary side of the second plate heat exchanger.

[0007] To prevent impurities in the third plate heat exchanger from entering the battery's cooling circuit, a liquid supply pipe is connected between the liquid supply port and the third plate heat exchanger. A flow meter and a filter are connected to the liquid supply pipe.

[0008] To ensure the normal flow of coolant in the return pipe, a return pipe is also connected between the return port and the first plate heat exchanger. A circulation pump, a PTC heater, an expansion tank, and a water replenishment tank are connected to the return pipe.

[0009] In order to regulate the pressure between the return pipe and the supply pipe, the return pipe and the supply pipe are connected by a pressure regulating valve.

[0010] In order to control the flow rate of cooling water and prevent the battery pack coolant from becoming too cold after cooling, a proportional regulating valve is connected between the first plate heat exchanger and the water outlet.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: by connecting the first plate heat exchanger to the primary side of the third plate heat exchanger, the coolant first enters the primary side of the first plate heat exchanger for heat exchange and cooling, and then enters the third plate heat exchanger to exchange heat with the refrigeration circuit on the secondary side of the third plate heat exchanger, thereby achieving a second cooling of the coolant. Through dual cooling, the temperature range of the coolant after cooling is guaranteed, ensuring that the battery pack operates within the optimal operating range. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of the structure of the liquid cooling unit of this utility model;

[0014] In the diagram: 1. First plate heat exchanger; 2. Second plate heat exchanger; 3. Third plate heat exchanger; 4. Battery pack cooling circulation supply circuit; 41. Supply port; 42. Filter; 43. Flow meter; 44. PTC heater; 45. Expansion tank; 46. Circulation pump; 47. Return port; 48. Make-up water tank; 5. Water-cooled refrigeration circuit; 6. Heat exchange circuit; 61. Expansion valve; 62. Compressor; 7. Proportional regulating valve; 8. Cooling water source; 81. Inlet; 82. Outlet; 9. Supply pipe; 10. Return pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 This utility model provides a technical solution: a high-efficiency and energy-saving liquid-cooled unit for a containerized energy storage system, including a third plate heat exchanger 3. A battery pack cooling circulation supply circuit 4 is connected to the primary side of the third plate heat exchanger 3. The battery pack cooling circulation supply circuit 4 is used to introduce coolant from the battery pack into the primary side of the third plate heat exchanger 3 to cool the coolant and ensure the operating temperature of the battery pack. A water-cooled refrigeration circuit 5 is connected to the secondary side of the third plate heat exchanger 3. A second plate heat exchanger 2 is connected within the water-cooled refrigeration circuit 5. The primary side of the second plate heat exchanger 2 is connected to the third plate heat exchanger 3. Refrigerant flows between the second plate heat exchanger 2 and the third plate heat exchanger 3, flowing into the secondary side of the third plate heat exchanger 3 to exchange heat with the primary side. A cooling water source 8 is connected to the secondary side of the second plate heat exchanger 2, and the cooling water source 8 is connected to a cooling tower. A cooling water source 8 is connected to the secondary side of the second plate heat exchanger 2 and the third plate heat exchanger 3. A compressor 62 and an electronic expansion valve 61 are connected, and the compressor 62 and the electronic expansion valve 61 are located on different pipelines. The cooling water source 8 is connected to an inlet 81 and an outlet 82, which are connected to the secondary side of the second plate heat exchanger 2. The refrigerant operation process is as follows: the room temperature liquid refrigerant enters the compressor 62 and becomes a high temperature and high pressure gas, which then enters the primary side of the second plate heat exchanger 2. At this time, the primary side of the second plate heat exchanger 2 is a condenser. The cooling water source 8 is connected to the secondary side of the second plate heat exchanger 2, absorbs the heat in the condenser, and converts the high temperature and high pressure gas into a high temperature and high pressure liquid. Then, the high temperature and high pressure liquid passes through the expansion valve 61 and is converted into a low temperature and low pressure liquid. The low temperature and low pressure liquid enters the secondary side of the third plate heat exchanger 3, absorbs the heat from the primary side of the third plate heat exchanger 3, and is converted into a low temperature and low pressure gas, which cools the battery pack coolant in the primary side of the third plate heat exchanger 3.

[0017] A first plate heat exchanger 1 is connected in series between the battery pack cooling circulation supply circuit 4 and the third plate heat exchanger 3. The battery pack cooling circulation supply circuit 4 includes a supply port 41 and a return port 47. The supply port 41 is connected to the third plate heat exchanger 3, and the return port 47 is connected to the first plate heat exchanger 1. The secondary side of the first plate heat exchanger 1 is connected to the cooling water source 8. The coolant of the battery pack flows out from the return port 47, first passes through the first plate heat exchanger 1 and exchanges heat with the cooling water source 8, which lowers the temperature of the coolant in the first step. Then it enters the primary side of the third plate heat exchanger 3 and exchanges heat with the secondary side of the third plate heat exchanger 3, which lowers the temperature in the second step. This ensures the cooling range of the battery pack coolant and keeps the temperature of the coolant within the optimal operating temperature range of the battery pack.

[0018] A supply pipe 9 is also connected between the liquid supply port 41 and the third plate heat exchanger 3. A flow meter 43 and a filter 42 are connected to the supply pipe 9. The flow meter 43 can observe the flow rate of the coolant, and the filter 42 filters the coolant to prevent impurities in the third plate heat exchanger 3 from entering the battery pack.

[0019] A return pipe 10 is also connected between the return port 47 and the first plate heat exchanger 1. A circulation pump 46, a PTC heater 44, an expansion tank 45, and a water replenishment tank 48 are connected to the return pipe 10. The circulation pump 46 pumps the coolant into the first plate heat exchanger 1 for the first heat exchange and cooling. The expansion tank 45 stabilizes the pipeline pressure and reduces the water flow impact in the pipeline. The PTC heater 44 is used to heat the coolant in low-temperature environments to prevent the battery pack from operating in low-temperature environments.

[0020] The return pipe 10 and the supply pipe 9 are connected by a pressure regulating valve. The pressure difference between the supply pipe 9 and the return pipe 10 is adjusted by the pressure regulating valve to avoid safety hazards caused by excessive pressure difference.

[0021] A proportional regulating valve 7 is connected between the first plate heat exchanger 1 and the outlet 82. The proportional regulating valve 7 controls the cooling water flow rate on the secondary side of the conventional heat exchange to control the temperature of the secondary side after heat exchange. Its main method is to reduce the flow rate of the low-temperature cooling water on the primary side to ensure that the primary side of the heat exchanger is not overcooled.

[0022] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-efficient liquid cooling unit for a container-type energy storage system, comprising a third plate heat exchanger, a battery cooling circulation liquid supply circuit is connected to a primary side of the third plate heat exchanger, a water cooling refrigeration circuit is connected to a secondary side of the third plate heat exchanger, a second plate heat exchanger is connected in the water cooling refrigeration circuit, and a cooling water source is connected to a secondary side of the second plate heat exchanger, characterized in that: The first plate heat exchanger is connected in series between the battery pack cooling circulation liquid supply circuit and the third plate heat exchanger, the battery pack cooling circulation liquid supply circuit comprises a liquid supply port and a liquid return port, the liquid supply port is connected with the third plate heat exchanger, the liquid return port is connected with the first plate heat exchanger, and the primary side of the first plate heat exchanger is connected with a cooling water source. ​ 2. The high-efficiency energy-saving liquid cooling unit for a container-type energy storage system according to claim 1, characterized in that: The second plate heat exchanger and the third plate heat exchanger are connected with a compressor and an electronic expansion valve, the compressor and the electronic expansion valve are respectively arranged on two pipelines, the cooling water source is connected with an inlet and an outlet, and the inlet and the outlet are connected to the secondary side of the second plate heat exchanger.

3. The high-efficiency energy-saving liquid-cooled unit for a container-type energy storage system according to claim 1, characterized in that: The liquid supply port and the third plate heat exchanger are further connected with a liquid supply pipe, and the liquid supply pipe is connected with a flow meter and a filter.

4. The high-efficiency energy-saving liquid-cooled unit for a container-type energy storage system according to claim 3, characterized in that: The liquid return port and the first plate heat exchanger are further connected with a liquid return pipe, and the liquid return pipe is connected with a circulating pump, a PTC heater, an expansion tank and a water supplement tank.

5. The high-efficiency energy-saving liquid-cooled unit for a container-type energy storage system according to claim 4, characterized in that: The liquid return pipe and the liquid supply pipe are connected through a pressure regulating valve.

6. The high-efficiency energy-saving liquid-cooled unit for a container-type energy storage system according to claim 1, characterized in that: The first plate heat exchanger and the outlet are connected with a proportional regulating valve.

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