An underwater energy storage system

Abstract

The present application provides an underwater energy storage system, including a battery compartment and a junction cabinet, wherein the battery compartment is connected to the junction cabinet circuit, the battery compartment is placed underwater, and a cooling unit for exchanging heat for the battery compartment is provided underwater; the cooling unit includes a plurality of heat dissipation parts and a heat exchange medium storage part, the heat dissipation part is attached to the outer wall of the battery compartment and a circulation pipeline is provided in the heat dissipation part; the inlet and outlet ends of the circulation pipeline are connected to the inlet and outlet ends of the heat exchange medium storage part through a connecting pipe; wherein the heat dissipation parts are connected to each other through the circulation pipeline. The battery compartment and the cooling unit are installed underwater, and the heat generated by the battery compartment during operation is conducted through the cooling unit outside the battery compartment. During the conduction process, the heat generated by the charging and discharging of the battery cell is absorbed by the external water. Compared with the liquid cooling method in the prior art, there is no need to add an air conditioner to reduce the temperature of the battery cell, thereby reducing the cooling cost of the energy storage system.

Description

Technical Field

[0001] The present application belongs to the field of underwater energy storage technology, and in particular, relates to an underwater energy storage system. Background Art

[0002] At present, industrial and commercial energy storage mainly adopts air cooling and liquid cooling. Both cooling methods have the following disadvantages:

[0003] 1) Air cooling can easily cause uneven core temperature, shorten the service life of the equipment, reduce heat dissipation efficiency, and easily lead to thermal runaway;

[0004] 2) Compared with the air cooling solution, the liquid cooling solution has an additional set of water cooling units. Although the heat exchange efficiency is higher, the cost also increases. Summary of the invention

[0005] In view of this, and in view of the shortcomings existing in the above-mentioned prior art, the main purpose of the present application is to provide an underwater energy storage system.

[0006] The technical solution adopted in the present application is as follows: an underwater energy storage system, comprising a battery compartment and a combiner cabinet, wherein the battery compartment is connected to the combiner cabinet circuit, the battery compartment is placed underwater, and a cooling unit for exchanging heat for the battery compartment is provided underwater;

[0007] The cooling unit includes a plurality of heat dissipation parts and a heat exchange medium storage part, wherein the heat dissipation part is attached to the outer wall of the battery compartment and a circulation pipeline is provided in the heat dissipation part; the inlet end and the outlet end of the circulation pipeline are respectively connected with the inlet end and the outlet end of the heat exchange medium storage part through a connecting pipe;

[0008] The flow pipes between the heat dissipation parts are interconnected.

[0009] Furthermore, the heat dissipation part includes a first heat dissipation plate and a second heat dissipation plate, and the first heat dissipation plate and the second heat dissipation plate are both provided with corresponding tube grooves, and when the first heat dissipation plate is buckled onto the second heat dissipation plate, the tube grooves on the two heat dissipation plates cooperate to form the circulation pipeline.

[0010] Furthermore, the first heat sink and the second heat sink are fixed by bolts; and the tube grooves on the first heat sink and the second heat sink are arranged in a zigzag shape.

[0011] Furthermore, a water pump is installed on the communication pipeline between the inlet end of the heat exchange medium storage part and the outlet end of the circulation pipeline, and the water pump is electrically connected to the external relay module.

[0012] Furthermore, the heat exchange medium storage unit stores antifreeze heat exchange medium.

[0013] Furthermore, the battery compartment includes an overall frame and a sealed cabin installed in the overall frame;

[0014] A battery pack box and a PCS box are installed in the sealed cabin; a heat conducting plate is connected to the bottom of the battery pack box, and thermal grease is filled between the battery pack box and the heat conducting plate; wherein the heat dissipation part is connected to the outer wall of the sealed cabin below the heat conducting plate.

[0015] Furthermore, a temperature sensor is provided in the battery pack box, and the temperature sensor is electrically connected to an external relay module.

[0016] The present application has the beneficial effects of installing the battery compartment and the cooling unit underwater, conducting the heat generated by the battery compartment when it is working through the cooling unit outside the battery compartment, and using external water to absorb the heat generated by charging and discharging of the battery cell during the conduction process. Compared with the liquid cooling method in the prior art, there is no need to add a separate air conditioner to lower the temperature of the battery cell, thereby reducing the cooling cost of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only used to illustrate and explain the present application, and are not used to limit the scope of the present application, wherein:

[0018] Figure 1 Schematic diagram of the underwater energy storage system for this application;

[0019] Figure 2 This is a schematic diagram of the connection structure between the cooling unit and the battery compartment in this application;

[0020] Figure 3 A three-dimensional schematic diagram of the first heat dissipation plate and the second heat dissipation plate in the present application;

[0021] Figure 4 This is a schematic diagram of the structure of the battery compartment in this application.

[0022] Figure numerals: 1. Battery compartment; 2. Junction cabinet; 3. Cooling unit; 4. Heat dissipation part; 5. First heat dissipation plate; 6. Second heat dissipation plate; 7. Pipe trough; 8. Heat exchange medium storage part; 9. Water pump; 11. Overall frame; 12. Sealed cabin; 13. Heat conduction plate; 15. Battery pack box; 16. PCS box; 17. Circulation pipe; 18. Connecting pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution, design method and advantages of this application more clear, the following is a further detailed description of this application through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0024] Reference Figures 1 to 4The present application provides an underwater energy storage system, including a battery compartment 1 and a junction cabinet 2, wherein the battery compartment 1 is circuit-connected to the junction cabinet 2, the battery compartment 1 is placed underwater, and a cooling unit 3 for exchanging heat for the battery compartment 1 is provided underwater; the cooling unit 3 includes a plurality of heat dissipation parts 4 and a heat exchange medium storage part 8, the heat dissipation part 4 is attached to the outer wall of the battery compartment 1, and a flow pipe 17 is provided in the heat dissipation part 4; the inlet end and the outlet end of the flow pipe 17 are respectively connected to the inlet end and the outlet end of the heat exchange medium storage part 8 through a connecting pipe 18; wherein the flow pipes 17 between the heat dissipation parts 4 are connected to each other.

[0025] In the above, reference Figure 2 and Figure 3 The heat dissipation part 4 includes a first heat dissipation plate 5 and a second heat dissipation plate 6, and the first heat dissipation plate 5 and the second heat dissipation plate 6 are both provided with corresponding tube grooves 7. When the first heat dissipation plate 5 is buckled on the second heat dissipation plate 6, the tube grooves 7 on the two heat dissipation plates cooperate to form the circulation pipeline 17; the first heat dissipation plate 5 and the second heat dissipation plate 6 are fixed by bolts; and the tube grooves 7 on the first heat dissipation plate 5 and the second heat dissipation plate 6 are arranged in a zigzag shape, and the heat dissipation area is expanded by extending the length of the liquid in the circulation pipeline 17, thereby effectively improving the heat exchange efficiency of the battery compartment, and at the same time, the temperature carried by the circulation pipeline 17 is reduced by using external water, thereby effectively reducing the heat dissipation cost of the underwater energy storage system; or a pipeline of the same material as the connecting pipe 18 is laid in the circulation pipeline 17, so that the internal circulating aqueous solution flows in the pipeline.

[0026] In the above, reference Figure 1 and Figure 2 As shown, a water pump 9 electrically connected to an external relay module (the relay module is not shown) is installed on the connecting pipeline between the inlet end of the heat exchange medium storage part 8 and the outlet end of the circulation pipeline 17; and the heat exchange medium storage part 8 stores an antifreeze heat exchange medium, which is an ethylene glycol solution. In this application, a 50% ethylene glycol solution is selected as the antifreeze heat exchange medium.

[0027] In the above, reference Figure 1 and Figure 4As shown, the battery compartment 1 includes an overall frame 11 and a sealed cabin body 12 installed in the overall frame 11; a battery pack box 15 and a PCS box 16 are installed in the sealed cabin body 12; a temperature sensor electrically connected to an external relay module is provided in the battery pack box 15, a heat conducting plate 13 is connected to the bottom of the battery pack box 15, and thermal grease is filled between the battery pack box 15 and the heat conducting plate 13; wherein the heat dissipation portion 4 is connected to the outer wall of the sealed cabin body 12 below the heat conducting plate 13; in the above, the heat in the battery pack box 15 is quickly transferred to the flowing aqueous solution and the two heat dissipation plates through the heat conducting plate 13 and the thermal grease. Since the two heat dissipation plates are placed in river water or sea water, the water temperature of the river water or sea water can be used to take away the transferred heat, thereby achieving low-energy heat dissipation and cooling.

[0028] It is worth mentioning that the relay module in this application is an existing product, which is used to transmit the information detected by the temperature sensor to the controller.

[0029] The underwater energy storage system in the present application has the same working principle as the traditional ground energy storage system. The battery pack box stores electric energy through the PCS cabinet and the junction cabinet during the low-peak period of electricity consumption; the electric energy is released during the peak period of electricity consumption. The charging and discharging of the battery cells will generate more heat. When the temperature in the battery pack box exceeds the set temperature value, the temperature sensor transmits the signal to the external relay module, and the relay module drives the water pump 9 to start running. At this time, the water in the heat exchange medium storage part flows to the heat dissipation part 4, and the added 50% ethylene glycol aqueous solution starts to circulate internally in the circulation pipe 17, and the heat is transferred through the circulation pipe 17. The aqueous solution conducts the heat generated in the battery compartment to the river water or sea water, and uses the river water or sea water for heat exchange to achieve a cooling effect. When the temperature is too low, the temperature sensor transmits the low temperature signal to the processor via the relay module. The processor controls the water pump 9 to stop running based on the received low temperature signal, and waits to start again when the temperature in the battery compartment is too high next time. In this cooling and heat dissipation process, the two heat dissipation plates where the circulation pipe 17 is located will also transfer part of the heat to the river water or sea water for heat exchange, further improving the heat exchange efficiency. Compared with the existing liquid cooling method, it effectively reduces the heat dissipation cost and is more energy-efficient.

[0030] As another embodiment of the present application, the heat dissipation part (i.e., the first heat dissipation plate and the second heat dissipation plate) can be placed at the bottom of the battery pack box, and thermal grease can be filled between the heat dissipation part and the bottom of the battery pack box, the heat exchange medium storage part can be installed inside the cabin, and the heat conduction plate is installed on the outer wall of the cabin and located at the lower end of the heat dissipation part; first, the antifreeze cooling heat exchange medium in the heat exchange medium storage part forms a cooling internal circulation in the circulation pipeline, and then the heat on the heat dissipation part is transferred to the river water or sea water through the heat conduction plate.

[0031] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An underwater energy storage system, comprising a battery compartment (1) and a combiner cabinet (2), wherein the battery compartment (1) is connected to the combiner cabinet (2) by circuit, characterized in that: The battery compartment (1) is placed underwater, and a cooling unit (3) for exchanging heat for the battery compartment (1) is provided underwater; The cooling unit (3) comprises a plurality of heat dissipation parts (4) and a heat exchange medium storage part (8); the heat dissipation part (4) is attached to the outer wall of the battery compartment (1) and a circulation pipeline (17) is provided in the heat dissipation part (4); the inlet end and the outlet end of the circulation pipeline (17) are respectively connected to the inlet end and the outlet end of the heat exchange medium storage part (8) through a connecting pipe (18); The flow pipes (17) between the heat dissipation parts (4) are interconnected.

2. An underwater energy storage system according to claim 1, characterized in that: The heat dissipation part (4) comprises a first heat dissipation plate (5) and a second heat dissipation plate (6), the first heat dissipation plate (5) and the second heat dissipation plate (6) are both provided with corresponding tube grooves (7), and when the first heat dissipation plate (5) is buckled onto the second heat dissipation plate (6), the tube grooves (7) on the two heat dissipation plates cooperate to form the circulation pipeline (17).

3. An underwater energy storage system according to claim 2, characterized in that: The first heat sink (5) and the second heat sink (6) are fixed by bolts; and the tube grooves (7) on the first heat sink (5) and the second heat sink (6) are arranged in a zigzag shape.

4. The underwater energy storage system according to claim 1, characterized in that: A water pump (9) is installed on the communication pipeline between the inlet end of the heat exchange medium storage part (8) and the outlet end of the circulation pipeline (17), and the water pump (9) is electrically connected to the external relay module.

5. The underwater energy storage system according to claim 1, characterized in that: The heat exchange medium storage portion (8) stores antifreeze heat exchange medium.

6. An underwater energy storage system according to claim 2, characterized in that: The battery compartment (1) comprises an overall frame (11) and a sealed compartment body (12) installed in the overall frame (11); A battery pack box (15) and a PCS box (16) are installed in the sealed cabin (12); a heat conducting plate (13) is connected to the bottom of the battery pack box (15), and thermal grease is filled between the battery pack box (15) and the heat conducting plate (13); wherein the heat dissipation part (4) is connected to the outer wall of the sealed cabin (12) below the heat conducting plate (13).

7. An underwater energy storage system according to claim 6, characterized in that: The battery pack box (15) is provided with a temperature sensor, and the temperature sensor is electrically connected to an external relay module.

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