Immersion liquid cooling energy storage cabinet

Abstract

The utility model relates to an immersion liquid cooling energy storage cabinet in the field of energy storage cabinets, which comprises a cabinet body, an energy storage cavity and an electric control cavity are arranged in the cabinet body, a battery combination pack is arranged in the energy storage cavity, the battery combination pack is composed of a box body, a box cover, a refrigeration part, a radiator and battery cells, a heat dissipation cavity is arranged in the box body, and the battery cells are arranged in the heat dissipation cavity. Cooling liquid is injected into the heat dissipation cavity, all the battery cells are immersed in the cooling liquid, the whole heat dissipation cavity is filled with the cooling liquid, the cooling liquid exchanges heat with the battery cells, the refrigerating part is arranged on the surface of the box cover, the radiator is arranged at the end, away from the box cover, of the refrigerating part, the refrigerating part exchanges heat with the box cover and the radiator, and a heat dissipation opening and an air inlet are formed in the surface of the cabinet body. The heat dissipation opening and the air inlet are oppositely formed in the two ends of the energy storage cavity, a heat dissipation air channel is formed in the energy storage cavity, a cooling liquid circulation assembly and an air conditioner pipeline assembly are omitted, energy consumption for heat dissipation during operation of the energy storage cabinet is effectively reduced through the design, and the proportion of electric energy capable of being used for energy storage or output is increased.

Description

Technical Field

[0001] The utility model relates to the field of energy storage cabinets, in particular to an immersion liquid cooling energy storage cabinet. Background Art

[0002] An energy storage cabinet is a device that can store electrical energy. It is usually composed of a battery pack, an inverter, a control chip, etc. It has high-efficiency energy storage and release capabilities. The application scenarios of energy storage cabinets are very wide, including but not limited to home scenes, commercial areas, industrial areas, communication base stations, data centers, and transportation facilities.

[0003] With the transformation of the global energy structure and the widespread application of renewable energy, household energy storage systems play an increasingly important role in home energy management. However, the traditional air-cooling heat dissipation method has exposed many shortcomings in the application of energy storage systems, such as low heat dissipation efficiency, uneven temperature distribution, and potential fire safety hazards. These problems seriously restrict the performance, life and safety of energy storage batteries. Especially in high temperature environments, air-cooling heat dissipation systems often cannot meet the heat dissipation requirements of battery packs, resulting in battery overheating, which in turn shortens the battery life and even causes safety accidents.

[0004] A liquid-cooled energy storage cabinet usually consists of a cabinet, a controller, a battery pack, a circulation component, a radiator and an air-conditioning pipe component. The battery pack, the circulation component and the air-conditioning pipe component are all electrically connected to the controller. Coolant is injected into the battery pack. The coolant circulates continuously between the radiator and the battery pack through the circulation component, so that the heat of the coolant is transferred to the radiator. The air-conditioning pipe component cools the radiator. The energy consumption of the heat dissipation system of the existing liquid-cooled energy storage cabinet is often large. Taking the UK Rock Farm energy storage container project of the Electric Power Research Institute of BYD Auto Industry Co., Ltd. as an example, the air-conditioning system (i.e. the main part of the heat dissipation system) accounts for 76.9% of the energy consumption of the entire energy storage equipment, resulting in a decrease in the overall energy efficiency of the energy storage cabinet. The electrical energy that could have been used for energy storage or output is consumed by the circulation component and the air-conditioning pipe component, reducing the energy utilization rate of the energy storage cabinet. At the same time, with the increase of the piping system and the refrigeration system, the overall failure rate of the energy storage system will also increase. Utility Model Content

[0005] In order to overcome the deficiencies of the existing technical solutions, the utility model provides an immersion liquid-cooled energy storage cabinet, which can effectively solve the technical problems that the energy consumption of the liquid-cooled energy storage cabinet for heat dissipation accounts for a large proportion and the system is complex and prone to failure.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An immersion liquid-cooled energy storage cabinet comprises a cabinet body, an energy storage cavity and an electric control cavity are arranged in the cabinet body, a circuit controller is arranged in the electric control cavity, more than two battery combination packs are arranged in the energy storage cavity, the battery combination pack is composed of a box body, a box cover, a refrigeration component, a radiator and a plurality of battery cells, a heat dissipation cavity is arranged in the box body, a plurality of battery cells are arranged in the heat dissipation cavity, the box cover is used to cover the opening of the heat dissipation cavity, a sealing component is arranged at the connection between the box cover and the box body, a coolant is injected into the heat dissipation cavity, the coolant immerses all the battery cells, the coolant exchanges heat with the battery cells, the refrigeration component is arranged on the surface of the box cover, the radiator is arranged at one end of the refrigeration component away from the box cover, the refrigeration component exchanges heat with the box cover and the radiator, a heat dissipation port and an air inlet are arranged on the surface of the cabinet body, the heat dissipation port and the air inlet are arranged at two ends of the energy storage cavity relatively, a heat dissipation air duct is formed in the energy storage cavity, and the radiator is located in the heat dissipation air duct.

[0008] Furthermore, a heat dissipation fan for discharging hot air in the energy storage cavity is provided in the heat dissipation port, and the heat dissipation fan is electrically connected to the circuit controller.

[0009] Furthermore, a cabinet door for closing the opening of the energy storage cavity is arranged on the surface of the cabinet, the cabinet door is rotatably connected to the cabinet via a hinge, an air inlet is arranged on the surface of the cabinet door, and a cooling fan is arranged at one end of the cabinet away from the cabinet door.

[0010] Furthermore, a dust filter is provided on the inner wall of the cabinet door, the dust filter is aligned with the air inlet, and the dust filter is detachably connected to the cabinet door.

[0011] Furthermore, the refrigeration element is a semiconductor refrigeration sheet, which has a hot surface and a cold surface. The hot surface is in close contact with the radiator for heat exchange, and the cold surface is in close contact with the surface of the box cover for heat exchange. The semiconductor refrigeration sheet is electrically connected to the circuit controller.

[0012] Furthermore, a thermally conductive adhesive is applied between the cold surface of the semiconductor refrigeration plate and the box cover to facilitate heat transfer.

[0013] Furthermore, a plurality of heat-absorbing fins are arranged at one end of the box cover close to the box body, and the surfaces of the heat-absorbing fins are immersed in the coolant, and the coolant exchanges heat with the heat-absorbing fins.

[0014] Furthermore, a plurality of heat dissipation fins are arranged on the surface of the radiator, and an air flow channel is formed between adjacent heat dissipation fins, and two ends of the air flow channel are respectively aligned with the heat dissipation port and the air inlet.

[0015] Furthermore, an oil filling port and a pressure relief port are provided on the surface of the box body, both of which are connected to the heat dissipation cavity, an oil storage box and a pressure relief valve are provided in the cabinet body, the pressure relief valve extends to the surface of the cabinet body, and the oil storage box and the pressure relief valve are both connected to the pressure relief port.

[0016] Furthermore, the circuit controller is also electrically connected to a temperature sensor, the number of the temperature sensors is consistent with the number of the battery combination packs, and the probes of the temperature sensors are in contact with the surfaces of the battery cells.

[0017] Compared with the prior art, the beneficial effect of the utility model is that the cooling liquid inside the box does not circulate with the outside. The battery cells are fully immersed in the coolant, and the heat generated by the battery cells during the charging and discharging process is absorbed by the coolant, and the heat in the coolant is transferred to the radiator through the refrigeration parts on the box cover. Thereby, the battery cells are always within a suitable operating temperature range, and the heat dissipation process is a static immersion liquid cooling design. The coolant is in a static state in the heat dissipation cavity. Compared with the heat dissipation device of the existing energy storage cabinet, the coolant circulation components and air conditioning pipeline components and other equipment are removed. This design effectively reduces the energy consumption used for heat dissipation during the operation of the energy storage cabinet, increases the proportion of electric energy that can be used for energy storage or output, avoids the risk of leakage of the coolant circulation components and air conditioning pipelines, and enables the system to operate more safely, more reliably, and more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the first embodiment of the utility model;

[0019] Figure 2 A schematic diagram of a battery pack in the first embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of coolant overflow and exhaust in the first embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of coolant reflux and air intake in the first embodiment of the utility model;

[0022] Figure 5 It is a three-dimensional schematic diagram of the second embodiment of the utility model;

[0023] Figure 6 This is a heat dissipation schematic diagram of the second embodiment of the utility model;

[0024] Figure 7 A three-dimensional diagram of a semiconductor refrigeration sheet according to a third embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the semiconductor cooling sheet, the radiator and the box cover in the third embodiment of the utility model;

[0026] Numbers in the figure: 1-cabinet, 2-energy storage cavity, 3-battery combination package, 301-cabinet, 302-cabinet cover, 3021-heat absorbing fins, 303-refrigeration parts, 3031-semiconductor refrigeration sheet, 3032-hot surface, 3033-cold surface, 304-radiator, 3041-heat dissipation fins, 305-battery cells, 306-heat dissipation cavity, 307-seal, 4-cabinet door, 5-air inlet, 6-oil filling port, 7-pressure relief port, 8-oil storage box, 9-pressure relief valve, 10-cooling fan, 11-dust filter. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] like Figure 1-Figure 3 As shown, an immersion liquid cooling energy storage cabinet includes a cabinet body 1, an energy storage cavity 2 and an electric control cavity are arranged in the cabinet body 1, a circuit controller is arranged in the electric control cavity, a mounting frame is arranged in the energy storage cavity 2, three slots are arranged on the mounting frame, a battery combination pack 3 is detachably installed in the slot, the battery combination pack 3 is composed of a box body 301, a box cover 302, a refrigeration component 303, a radiator 304 and a plurality of battery cells 305, a heat dissipation cavity 306 is arranged in the box body 301, a box cover 302 is used to cover the opening of the heat dissipation cavity 306, a sealing member 307 is arranged at the connection between the box cover 302 and the box body 301, and the sealing member 307 can be sealed. A sealing ring or a sealing gasket is used to prevent leakage of the coolant. The box cover 302 is fixedly connected to the edge of the box body 301 by bolts. The heat dissipation cavity 306 is injected with coolant, and the coolant immerses all the battery cells 305. The coolant exchanges heat with the battery cells 305. The refrigeration component 303 is arranged on the surface of the box cover 302. The radiator 304 is arranged at the end of the refrigeration component 303 away from the box cover 302. The refrigeration component 303 exchanges heat with the box cover 302 and the radiator 304. The surface of the cabinet 1 is provided with a heat dissipation port and an air inlet 5. The heat dissipation port and the air inlet 5 are relatively arranged at the two ends of the energy storage cavity 2 to form convection. A heat dissipation duct is formed in the energy storage cavity 2, and the radiator 304 is located in the heat dissipation duct.

[0030] Heat dissipation process: the heat generated by the battery cell 305 when working is absorbed by the low-temperature coolant, and a plurality of heat-absorbing fins 3021 are arranged at one end of the box cover 302 close to the box body 301, and the surface of the heat-absorbing fins 3021 is immersed in the coolant. When the temperature of the coolant rises, the heat-absorbing fins 3021 exchange heat with the coolant, and the heat is transferred from the coolant to the heat-absorbing fins 3021, and the heat-absorbing fins 3021 then disperse the heat to the cover body, and the heat on the cover body is transferred to the radiator 304 through the refrigeration element 303. A plurality of heat-dissipating fins 3041 are arranged on the surface of the radiator 304, and an air flow channel is formed between adjacent heat-dissipating fins 3041, and the two ends of the air flow channel are respectively aligned with the heat dissipation port and the air inlet 5. When the natural air from the outside enters the energy storage cavity 2 from the air inlet 5, the natural wind with a lower temperature flows through the air flow channel and takes away the heat of the heat dissipating fins 3041, and finally the hot air is discharged from the heat dissipation port.

[0031] The surface of the box body 301 is provided with an oil filling port 6 and a pressure relief port 7, both of which are connected to the heat dissipation cavity 306. An oil storage box 8 and a pressure relief valve 9 are provided in the cabinet body 1, and the pressure relief valve 9 extends to the surface of the cabinet body 1. The oil storage box 8 and the pressure relief valve 9 are connected to the pressure relief port 7. When the temperature of the coolant is too high, the density decreases and the volume increases. Since the volume of the heat dissipation cavity 306 is fixed, Figure 3 As shown, after the volume of the coolant increases, the air at the top of the heat dissipation cavity 306 and part of the coolant are discharged from the heat dissipation cavity 306 through the pressure relief port 7, and the air discharged from the pressure relief port 7 is discharged to the outside of the cabinet 1 through the pressure relief valve 9. After the coolant is discharged from the heat dissipation cavity 306, it falls into the oil storage box 8. Figure 4 As shown, when the coolant drops in volume, part of the coolant is discharged from the heat dissipation cavity 306. At this time, the coolant in the heat dissipation cavity 306 is not full. The air and the coolant in the oil storage box 8 can return to the heat dissipation cavity 306 through the pressure relief port 7, ensuring that the coolant in the heat dissipation cavity 306 can immerse the battery cell 305 and the heat absorption fin 3021.

[0032] In the submerged liquid-cooled energy storage cabinet of this embodiment, the coolant inside the box 301 does not circulate with the outside. The battery cells 305 are fully immersed in the coolant, and the heat generated by the battery cells 305 during the charging and discharging process is absorbed by the coolant, and the heat in the coolant is transferred to the radiator 304 through the refrigeration element 303 on the box cover 302. Thereby, the battery cell 305 is always in a suitable operating temperature range. The heat dissipation process is a static immersion liquid cooling design. The coolant is in a static state in the heat dissipation cavity 306. Compared with the heat dissipation device of the existing energy storage cabinet, the coolant circulation component and air conditioning pipeline component and other equipment are removed. This design effectively reduces the energy consumption used for heat dissipation during the operation of the energy storage cabinet, increases the proportion of electric energy that can be used for energy storage or output, avoids the risk of leakage of the coolant circulation component and the air conditioning pipeline, and enables the system to operate more safely, more reliably and more efficiently. The coolant completely isolates the battery cell 305 from oxygen, quickly dissipates heat, and eliminates the risk of lithium battery fire and explosion. The coolant cooling can quickly and effectively take away the heat generated by the battery, keep the battery within a suitable operating temperature range, improve the battery charging and discharging efficiency and cycle life, ensure that the temperature distribution of each battery cell is uniform, and reduce the impact of temperature differences on battery performance.

[0033] Embodiment 2:

[0034] like Figure 4-Figure 5 As shown, the difference between this embodiment and the first embodiment is that a cooling fan 10 for discharging hot air in the energy storage cavity 2 is provided in the heat dissipation port, and the cooling fan 10 is electrically connected to the circuit controller. A cabinet door 4 for closing the opening of the energy storage cavity 2 is provided on the surface of the cabinet 1, and the cabinet door 4 is rotatably connected to the cabinet 1 through a hinge. The air inlet 5 is provided on the surface of the cabinet door 4, and the cooling fan 10 is provided at one end of the cabinet 1 away from the cabinet door 4. The inner wall of the cabinet door 4 is provided with a dust filter 11, and the dust filter 11 is aligned with the air inlet 5. The dust filter 11 and the cabinet door 4 are detachably connected. The heat dissipation fan 10 can be used to actively discharge the hot air in the energy storage chamber 2 to the outside of the cabinet 1. After the gas in the energy storage chamber 2 is discharged, the internal air pressure is reduced, and the air pressure outside the cabinet 1 is higher than the air pressure inside the energy storage chamber 2, so that the natural air outside the cabinet 1 is sucked into the energy storage chamber 2 from the air inlet 5, thereby improving the heat dissipation efficiency. The dust filter 11 can prevent external dust from entering the energy storage chamber 2 along with the air from the air inlet 5, and prevent the surface of the heat dissipation fins 3041 from being adhered to dust, resulting in a decrease in heat dissipation efficiency. After opening the cabinet door 4, the dust filter 11 can be removed and cleaned or replaced on the inner side of the cabinet door 4. Figure 5 The arrows in the figure indicate the direction of air flow during heat dissipation.

[0035] Embodiment three:

[0036] like Figure 6-Figure 7As shown, the difference between this embodiment and the second embodiment is that the refrigeration element 303 is a semiconductor refrigeration sheet 3031, and the semiconductor refrigerator has a hot surface 3032 and a cold surface 3033. The hot surface 3032 is in close contact with the radiator 304 for heat exchange, and the cold surface 3033 is in close contact with the surface of the box cover 302 for heat exchange. The semiconductor refrigeration sheet 3031 is electrically connected to the circuit controller, and a thermal conductive glue is applied between the cold surface 3033 of the semiconductor refrigeration sheet 3031 and the box cover 302 to facilitate heat transfer. The circuit controller is also electrically connected to a temperature sensor, and the number of temperature sensors is consistent with that of the battery combination package 3. The probe of the temperature sensor is in contact with the surface of the battery cell 305. The semiconductor refrigeration sheet 3031 is laminated by a plurality of P-type semiconductor sheets and N-type semiconductor sheets through adhesives such as silica gel. After direct current is passed, a heat transfer is generated between the P-type semiconductor sheets and the N-type semiconductor sheets. Heat transfer, heat is transferred from one end to the other end, thereby forming hot and cold ends, namely the hot surface 3032 and the cold surface 3033, which has the characteristics of fast response and efficient regulation, can achieve cooling in a short time, and improve thermal conductivity. The temperature sensor can detect the temperature of the battery cell 305 in real time, and convert the temperature information into an electrical signal and transmit it to the circuit controller. When the temperature of the battery cell 305 is lower than the set value, the circuit controller controls the semiconductor refrigeration plate 3031 and the cooling fan 10 to stop working. When the temperature of the battery cell 305 is higher than the set value, the circuit controller controls the semiconductor refrigeration plate 3031 and the cooling fan 10 to start working, so that the battery cell 305 is always running in an appropriate temperature range. The circuit controller monitors and adjusts the working frequency and power of the semiconductor refrigeration plate 3031 in real time, so as to achieve precise control of the temperature of the battery combination pack 3 and improve the stability and reliability of the energy storage cabinet operation.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An immersion liquid-cooled energy storage cabinet, comprising a cabinet body, an energy storage cavity and an electric control cavity are arranged in the cabinet body, a circuit controller is arranged in the electric control cavity, and more than two battery combination packs are arranged in the energy storage cavity, characterized in that: The battery combination pack is composed of a box body, a box cover, a refrigeration component, a radiator and a plurality of battery cells. A heat dissipation cavity is arranged in the box body, and the plurality of battery cells are arranged in the heat dissipation cavity. The box cover is used to cover the opening of the heat dissipation cavity. A sealing component is arranged at the connection between the box cover and the box body. Coolant is injected into the heat dissipation cavity. The coolant immerses all the battery cells and fills the entire heat dissipation cavity. The coolant exchanges heat with the battery cells. The refrigeration component is arranged on the surface of the box cover. The radiator is arranged at one end of the refrigeration component away from the box cover. The refrigeration component exchanges heat with the box cover and the radiator. A heat dissipation port and an air inlet are arranged on the surface of the cabinet body. The heat dissipation port and the air inlet are relatively arranged at the two ends of the energy storage cavity. A heat dissipation duct is formed in the energy storage cavity, and the radiator is located in the heat dissipation duct.

2. The immersion liquid-cooled energy storage cabinet according to claim 1, characterized in that: The heat dissipation port is provided with a heat dissipation fan for discharging hot air in the energy storage cavity, and the heat dissipation fan is electrically connected to the circuit controller.

3. The immersion liquid-cooled energy storage cabinet according to claim 2, characterized in that: The cabinet body is provided with a cabinet door for closing the opening of the energy storage cavity on the surface of the cabinet body. The cabinet door is rotatably connected to the cabinet body through a hinge. The air inlet is provided on the surface of the cabinet door. The cooling fan is provided at one end of the cabinet body away from the cabinet door.

4. The immersion liquid-cooled energy storage cabinet according to claim 3, characterized in that: The inner wall of the cabinet door is provided with a dust filter, the dust filter is aligned with the air inlet, and the dust filter is detachably connected to the cabinet door.

5. An immersion liquid-cooled energy storage cabinet according to any one of claims 1 to 4, characterized in that: The refrigeration element is a semiconductor refrigeration sheet, which has a hot surface and a cold surface. The hot surface is in close contact with the radiator for heat exchange, and the cold surface is in close contact with the surface of the box cover for heat exchange. The semiconductor refrigeration sheet is electrically connected to the circuit controller.

6. The immersion liquid-cooled energy storage cabinet according to claim 5, characterized in that: A heat-conducting glue is applied between the cold surface of the semiconductor refrigeration plate and the box cover to facilitate heat transfer.

7. An immersion liquid-cooled energy storage cabinet according to any one of claims 1 to 4, characterized in that: A plurality of heat-absorbing fins are arranged at one end of the box cover close to the box body, and the surfaces of the heat-absorbing fins are immersed in the cooling liquid, and the cooling liquid and the heat-absorbing fins perform heat exchange.

8. An immersion liquid-cooled energy storage cabinet according to any one of claims 1 to 4, characterized in that: A plurality of heat dissipation fins are arranged on the surface of the heat sink, and an air flow channel is formed between adjacent heat dissipation fins, and two ends of the air flow channel are respectively aligned with the heat dissipation port and the air inlet.

9. An immersion liquid-cooled energy storage cabinet according to any one of claims 1 to 4, characterized in that: The surface of the box body is provided with an oil filling port and a pressure relief port, both of which are connected to the heat dissipation cavity. An oil storage box and a pressure relief valve are provided in the cabinet body, and the pressure relief valve extends to the surface of the cabinet body. The oil storage box and the pressure relief valve are both connected to the pressure relief port.

10. An immersion liquid-cooled energy storage cabinet according to any one of claims 1 to 4, characterized in that: The circuit controller is also electrically connected to a temperature sensor, the number of the temperature sensors is consistent with the number of the battery combination packs, and the probes of the temperature sensors are in contact with the surfaces of the battery cells.

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