Energy storage single-cylinder oil circulation immersion liquid cooling structure

Abstract

The utility model relates to an energy storage single cylinder oil circulation immersion liquid cooling structure in the immersion liquid cooling field, comprising a box body and a battery pack, an immersion oil cylinder is arranged in the box body, the box body is provided with a cover plate, the cover plate is used for covering the immersion oil cylinder and sealing the immersion oil cylinder, the top of the immersion oil cylinder is provided with a liquid separator, the bottom end of the immersion oil cylinder is provided with an oil return port, and the oil return port is provided with an oil outlet. An oil inlet pipe, an oil return pipe, an oil pump and a heat exchanger are arranged on the box body, the oil inlet pipe and the oil return pipe are communicated with the two ends of the oil pump respectively, the end, away from the oil pump, of the oil inlet pipe extends into the immersion oil cylinder and is communicated with the liquid separator, and the end, away from the oil pump, of the oil return pipe is communicated with the oil return port; a plurality of liquid leakage holes are formed in one surface, close to the battery pack, of the liquid separator, cooling oil is filled in the immersion oil cylinder, the battery pack is immersed in the cooling oil, and the cooling oil can be more fully contacted with battery cells in the battery pack, so that the uniform control of the temperature of the battery cells is realized, the temperature difference of the whole cluster of battery cells is effectively reduced, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of immersion liquid cooling, and in particular to an energy storage single-cylinder oil circulation immersion liquid cooling structure. Background Technology

[0002] Immersion liquid cooling is a highly efficient thermal management method that directly immerses heat-generating components in a coolant, utilizing the coolant's flow to remove heat and achieve rapid and uniform heat dissipation. This technology boasts advantages such as high heat dissipation efficiency, low noise, and easy maintenance, and is widely used in high-performance computing, data centers, and energy storage systems. Immersion liquid cooling not only effectively controls equipment temperature but also improves equipment stability and reliability, extending its lifespan. In energy storage systems, the battery pack is the primary heat-generating component. To effectively control the battery pack temperature and improve the performance and stability of the energy storage system, an immersion liquid cooling structure is typically used for heat dissipation. This structure includes a sealed enclosure containing an immersion cylinder, where the battery pack is completely submerged in cooling oil. The cooling oil circulates within the immersion cylinder via an oil pump, carrying away the heat generated by the battery pack. Connection terminals are located on the surface of the enclosure for electrical connections between the battery pack and external devices. Furthermore…

[0003] While existing immersion liquid cooling structures have achieved some heat dissipation effects in energy storage systems, they still have some drawbacks. Because the cooling oil tends to concentrate in the vicinity of the inlet after entering the immersion tank, the cell temperature in that area is relatively low. Meanwhile, cells in other areas experience relatively higher temperatures due to uneven cooling oil distribution. This temperature difference not only affects the performance and lifespan of the battery pack but also reduces the stability and reliability of the entire energy storage system. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides an energy storage single-cylinder oil circulation immersion liquid cooling structure, which can effectively solve the technical problem of cooling oil concentrating near the oil inlet.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A single-cylinder oil circulation immersion liquid cooling structure for energy storage includes a housing and a battery pack. An immersion oil cylinder is installed inside the housing, and the battery pack is installed in the immersion oil cylinder. Connection terminals are provided on the surface of the housing, and the battery pack is electrically connected to external equipment through the connection terminals. The housing is provided with a cover plate for covering and sealing the immersion oil cylinder. A distributor is provided at the top of the immersion oil cylinder, and an oil return port is provided at the bottom of the immersion oil cylinder. An oil inlet pipe, an oil return pipe, an oil pump, and a heat exchanger are provided on the housing. The oil inlet pipe and the oil return pipe are respectively connected to both ends of the oil pump. The end of the oil inlet pipe away from the oil pump extends into the immersion oil cylinder and is connected to the distributor. The end of the oil return pipe away from the oil pump is connected to the oil return port. The oil inlet pipe or the oil return pipe passes through the heat exchanger. Several leakage holes are provided on the side of the distributor near the battery pack. Cooling oil is filled into the immersion oil cylinder, and the cooling oil immerses the battery pack. The cooling oil circulates in the immersion oil cylinder through the oil pump.

[0007] The cooling oil in the submerged oil cylinder flows into the return oil pipe through the return oil port. The oil pump transports the cooling oil in the return oil pipe to the heat exchanger. In the heat exchanger, the cooling oil exchanges heat with the refrigerant, which lowers the temperature of the cooling oil. The low-temperature cooling oil flows from the inlet pipe to the distributor, and then is evenly distributed to the top of the submerged oil cylinder through the drain hole. The cooling oil at the top of the submerged oil cylinder flows through the battery pack and absorbs the heat released by the charging and discharging of the battery cells.

[0008] Furthermore, an oil inlet shut-off valve is installed on the oil inlet pipe, and a return oil shut-off valve is installed on the oil return pipe.

[0009] Furthermore, the edge of the immersion cylinder is provided with a retaining edge, and a sealing ring and a sealing groove are provided on the retaining edge. The sealing ring is located in the sealing groove. After the cover plate is connected to the box body, the inner wall of the cover plate squeezes the sealing ring, causing the sealing ring to undergo elastic deformation and seal the gap between the cover plate and the box body.

[0010] Furthermore, the heat exchanger is a plate heat exchanger, and the housing is equipped with a protective cover that covers the plate heat exchanger and the oil pump.

[0011] Furthermore, the plate heat exchanger is divided into a primary side and a secondary side. The primary side is connected to the oil inlet pipe or the oil return pipe for heat exchange, and the secondary side is connected to the air conditioning system for heat exchange.

[0012] Furthermore, the housing is equipped with an oil inlet for maintenance, an oil outlet, and a level gauge for visually observing the liquid level. The oil inlet is directly connected to the immersion cylinder, and the oil outlet is connected to the return oil pipe.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: The inclusion of a distributor allows the low-temperature cooling oil to flow from the inlet pipe to the distributor, ensuring even distribution through the leakage holes to the top of the submerged oil cylinder. This avoids the problem of excessive oil concentration near the inlet in traditional cooling methods, which leads to lower cell temperatures in that area and higher temperatures in other areas. The even distribution via the distributor allows for more thorough contact between the cooling oil and the cells within the battery pack, achieving uniform temperature control of the cells, effectively reducing the temperature difference across the entire cell cluster, extending the battery pack's lifespan, and improving the stability and reliability of the entire energy storage system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the liquid separator in this utility model;

[0016] Figure 3 This is a schematic diagram of the cooling oil circulation of this utility model;

[0017] The following are the labels in the diagram: 1-Box body, 2-Battery pack, 3-Immersion cylinder, 4-Connecting terminal, 5-Cover plate, 6-Oil inlet pipe, 7-Oil return pipe, 8-Divider, 9-Leakage hole, 10-Oil inlet shut-off valve, 11-Oil return shut-off valve, 12-Sealing ring, 13-Oil inlet, 14-Oil outlet, 15-Level gauge, 16-Protective cover. Detailed Implementation

[0018] 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.

[0019] The following is combined with Figures 1-3 A detailed description of an energy storage single-cylinder oil circulation immersion liquid cooling structure of this utility model is provided below:

[0020] A single-cylinder oil circulation immersion liquid cooling structure for energy storage includes a housing 1 and a battery pack 2. An immersion oil cylinder 3 is installed inside the housing 1, and the battery pack 2 is housed within the immersion oil cylinder 3. Connection terminals 4 are provided on the surface of the housing 1, through which the battery pack 2 is electrically connected to external equipment. A cover plate 5 is provided on the housing 1 to cover and seal the immersion oil cylinder 3. A distributor 8 is provided at the top of the immersion oil cylinder 3, and an oil return port is provided at the bottom of the immersion oil cylinder 3. An oil inlet pipe 6 and an oil return pipe 6 are provided on the housing 1. Pipe 7, oil pump and heat exchanger, oil inlet pipe 6 and oil return pipe 7 are respectively connected to both ends of oil pump. The end of oil inlet pipe 6 away from oil pump extends into immersion oil cylinder 3 and is connected to distributor 8. The end of oil return pipe 7 away from oil pump is connected to oil return port. Oil inlet pipe 6 passes through heat exchanger. Cooling oil and refrigerant exchange heat in heat exchanger. Several leakage holes 9 are provided on the side of distributor 8 near battery pack 2. Cooling oil is filled in immersion oil cylinder 3. Cooling oil immerses battery pack 2. Cooling oil circulates in immersion oil cylinder 3 through oil pump.

[0021] like Figure 3 As shown by the arrow, the cooling oil in the submerged oil cylinder 3 flows into the return oil pipe 7 through the return oil port. The oil pump transports the cooling oil in the return oil pipe 7 to the inlet oil pipe 6. The cooling oil exchanges heat with the refrigerant in the heat exchanger, which lowers the temperature of the cooling oil. The low-temperature cooling oil flows from the inlet oil pipe 6 to the distributor 8, and then is evenly distributed to the top of the submerged oil cylinder 3 through the drain hole 9. The cooling oil at the top of the submerged oil cylinder 3 flows through the battery pack 2 and absorbs the heat released by the charging and discharging of the battery cells.

[0022] A distributor 8 is provided. When the low-temperature cooling oil flows from the oil inlet pipe 6 to the distributor 8, the cooling oil can be evenly distributed to the top of the submerged oil cylinder 3 through the leakage holes 9. This avoids the problem of excessive concentration of cooling oil near the oil inlet in traditional cooling methods, which leads to lower cell temperatures in that area and higher cell temperatures in other areas. Through the even distribution of the cooling oil by the distributor 8, the cooling oil can make more thorough contact with the cells in the battery pack 2, thereby achieving uniform control of the cell temperature, effectively reducing the temperature difference of the entire cell cluster, extending the service life of the battery pack 2, and improving the stability and reliability of the entire energy storage system.

[0023] An oil inlet shut-off valve 10 is installed on the oil inlet pipe 6, and a return oil shut-off valve 11 is installed on the oil return pipe 7. By controlling the opening and closing of the oil inlet shut-off valve 10 and the return oil shut-off valve 11, the circulation flow of the cooling oil can be easily adjusted, thereby achieving precise control of the temperature of the battery pack 2. When it is necessary to replace the battery pack 2 or repair the cooling system, the circulation of the cooling oil can be quickly cut off by closing the oil inlet shut-off valve 10 and the return oil shut-off valve 11, ensuring the safe conduct of the repair process.

[0024] The edge of the immersion cylinder 3 is provided with a retaining edge, and a sealing ring 12 and a sealing groove are provided on the retaining edge. The sealing ring 12 is set in the sealing groove. After the cover plate 5 is connected to the housing 1, the inner wall of the cover plate 5 squeezes the sealing ring 12, causing the sealing ring 12 to undergo elastic deformation and seal the gap between the cover plate 5 and the housing 1, thereby improving the sealing performance of the immersion cylinder 3, effectively preventing cooling oil leakage, and improving the reliability and safety of the entire energy storage system.

[0025] The heat exchanger is a plate heat exchanger. A protective cover 16 is installed on the housing 1 to cover the plate heat exchanger and oil pump. Plate heat exchangers have advantages such as high efficiency, compactness, and ease of maintenance. They can quickly transfer heat from the cooling oil to the external medium, achieving rapid cooling. The protective cover 16 protects the plate heat exchanger and oil pump from external environmental interference and damage, extending the service life of the equipment. The plate heat exchanger is divided into a primary side and a secondary side. The primary side is connected to the oil inlet pipe 6 or the oil return pipe 7 for heat exchange, while the secondary side is connected to the air conditioning system for heat exchange. The low-temperature medium of the air conditioning system can be used to further reduce the temperature of the cooling oil, improving heat dissipation efficiency and reducing energy consumption and operating costs.

[0026] The housing 1 is equipped with an oil inlet 13 and an oil outlet 14 for maintenance, as well as a level gauge 15 for visually observing the liquid level. The oil inlet 13 is directly connected to the submerged oil cylinder 3, and the oil outlet 14 is connected to the return oil pipe 7. The oil inlet 13 and the oil outlet 14 facilitate the addition and discharge of cooling oil, making system maintenance and upkeep easier. The level gauge 15 displays the real-time level of the cooling oil in the submerged oil cylinder 3, ensuring that the cooling oil is always kept within an appropriate range, avoiding poor heat dissipation or safety hazards caused by excessively low or high liquid levels.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A single-cylinder oil circulation immersion liquid cooling structure for energy storage, comprising a housing and a battery pack, wherein an immersion oil cylinder is disposed within the housing, the battery pack is disposed within the immersion oil cylinder, and connection terminals are disposed on the surface of the housing, the battery pack being electrically connected to an external device via the connection terminals, characterized in that: The housing is equipped with a cover plate, which is used to cover and seal the immersion cylinder. A distributor is provided on the top of the immersion cylinder, and an oil return port is provided at the bottom of the immersion cylinder. An oil inlet pipe, an oil return pipe, an oil pump, and a heat exchanger are provided on the housing. The oil inlet pipe and the oil return pipe are respectively connected to both ends of the oil pump. The end of the oil inlet pipe away from the oil pump extends into the immersion cylinder and is connected to the distributor. The end of the oil return pipe away from the oil pump is connected to the oil return port. The oil inlet pipe or the oil return pipe passes through the heat exchanger. Several leakage holes are provided on the side of the distributor near the battery pack. Cooling oil is filled into the immersion cylinder, and the cooling oil immerses the battery pack. The cooling oil circulates in the immersion cylinder through the oil pump. The cooling oil in the submerged oil cylinder flows into the return oil pipe through the return oil port. The oil pump transports the cooling oil in the return oil pipe to the heat exchanger. In the heat exchanger, the cooling oil exchanges heat with the refrigerant, which lowers the temperature of the cooling oil. The low-temperature cooling oil flows from the inlet pipe to the distributor, and then is evenly distributed to the top of the submerged oil cylinder through the drain hole. The cooling oil at the top of the submerged oil cylinder flows through the battery pack and absorbs the heat released by the charging and discharging of the battery cells.

2. The energy storage single-cylinder oil circulation immersion liquid cooling structure according to claim 1, characterized in that: An oil inlet shut-off valve is installed on the oil inlet pipe, and a return oil shut-off valve is installed on the oil return pipe.

3. The energy storage single-cylinder oil circulation immersion liquid cooling structure according to claim 1, characterized in that: The edge of the immersion cylinder is provided with a retaining edge, and a sealing ring and a sealing groove are provided on the retaining edge. The sealing ring is set in the sealing groove. After the cover plate is connected to the box body, the inner wall of the cover plate squeezes the sealing ring, causing the sealing ring to undergo elastic deformation and seal the gap between the cover plate and the box body.

4. The energy storage single-cylinder oil circulation immersion liquid cooling structure according to any one of claims 1-3, characterized in that: The heat exchanger is a plate heat exchanger, and the housing is equipped with a protective cover that covers the plate heat exchanger and the oil pump.

5. The energy storage single-cylinder oil circulation immersion liquid cooling structure according to claim 4, characterized in that: The plate heat exchanger is divided into a primary side and a secondary side. The primary side is connected to the oil inlet pipe or the oil return pipe for heat exchange, and the secondary side is connected to the air conditioning system for heat exchange.

6. A single-cylinder oil circulation immersion liquid cooling structure for energy storage according to any one of claims 1-3, characterized in that: The housing is equipped with an oil inlet for maintenance, an oil outlet for maintenance, and a level gauge for visually observing the liquid level. The oil inlet is directly connected to the immersion cylinder, and the oil outlet is connected to the return oil pipe.

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