An energy storage liquid cooling device with a hot air reflux prevention air duct

Abstract

The present invention relates to the field of energy storage technologies, and particularly to an energy storage liquid cooling device with an anti-hot air reflux air duct. Existing air ducts are limited by the heat dissipation window and the cabinet space, and have to use special-shaped designs, resulting in increased production difficulty and air resistance, as well as difficult sealing detection and easy hot air reflux. The present invention provides an energy storage liquid cooling device with an anti-hot air reflux air duct. A partition is provided inside the cabinet to separate the energy storage part and the heat dissipation part, and the PCS and the liquid cooling unit with large heat generation are concentrated for heat dissipation, and both can dissipate heat through the heat dissipation partition, independent fans, and ventilation ducts. The air duct structure has an air inlet and a heat dissipation window on the cabinet door, the inner partition is connected to the ventilation duct and forms a hollow sandwich with the heat dissipation window, and the inner partition has a sealing part, a detachable sealing window, etc. This air duct structure is simply designed, has a free position, does not need to be closely attached to the heat dissipation window, can reduce the air resistance and reduce the hot air reflux, is convenient for production and maintenance, and improves the heat dissipation efficiency and equipment reliability.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage, and in particular to an energy storage liquid cooling device with a hot air backflow prevention air duct. Background Art

[0002] Energy storage is an important technology and basic equipment to support the power system. It can provide peak load regulation, frequency regulation, standby, black start, demand response support and other services for power grid operation. It is an important means to improve the flexibility, economy and safety of traditional power systems. At present, the technical route of energy storage thermal management is mainly based on air cooling and liquid cooling. The air cooling structure is simple, but the heat exchange efficiency is low and precise temperature control cannot be achieved. Compared with traditional air cooling, liquid cooling uses the high thermal conductivity and high heat capacity characteristics of liquid to replace air as a heat dissipation medium, and the heat dissipation path is short. The low-temperature liquid is directly supplied to the battery cell equipment through the cold distribution unit (CDU, Cold Distribution Unit) to achieve precise heat dissipation, thereby reducing the system's self-consumption of electricity. Therefore, the liquid cooling system has become the mainstream choice for industrial and commercial energy storage.

[0003] The power conversion system (PCS) and liquid cooling unit in the liquid cooling equipment are the only equipment that needs to communicate with the external environment of the cabinet and requires heat exchange. When these two components exchange heat with the outside world, air cooling equipment is usually used, which requires the air duct and the heat dissipation window to be sealed. If the sealing is poor, the hot air that should be discharged outside the cabinet will return to the cabinet and be sucked into other equipment again, causing hot air reflux and secondary heating. This will greatly affect the working efficiency of the equipment and even damage electronic devices.

[0004] The current design of air ducts faces the following problems:

[0005] 1. The air duct currently designed needs to be close to the heat dissipation window, but the heat dissipation window is installed on the cabinet door, and its position and size are limited by the size, aesthetics and protection level of the cabinet door. The air inlet and outlet of the air duct are also limited by the cabinet space, and usually cannot be directly connected to the input and output. The air duct can only be shaped to avoid the limitation caused by space. The shaped wall surface not only increases the difficulty of design and processing, but also increases the wind resistance. It is also difficult for the shaped air duct to fully utilize the effective ventilation area of ​​the heat dissipation window;

[0006] 2. When testing the sealing performance, the most direct method is to close the cabinet door to observe whether the two are tightly fitted. However, in the prior art, the air duct outlet is generally deep inside the cabinet, so this method is difficult to achieve;

[0007] 3. Both of the above two problems will cause hot air to flow back, that is, the cooling fan will suck back the air that has been heated after passing through the heating device and use it for cooling again. This will greatly reduce the heat dissipation efficiency and may damage the heating device seriously when it is severe. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a liquid-cooled energy storage device with separated energy storage and heat dissipation, which includes a cabinet body, an energy storage part and a heat dissipation part.

[0009] There is a first cabinet door on the front of the cabinet body, a second cabinet door on the back of the cabinet body, and there is also a partition in the cabinet body to separate the energy storage part and the heat dissipation part. The energy storage part is a battery pack. In the heat dissipation part, PCS with large heat dissipation and a liquid-cooled unit are arranged to distinguish the heat dissipation demand levels of the heat dissipation part and the energy storage part. The battery pack in the energy storage part is cooled by a liquid-cooled pipe, and the liquid-cooled pipe transfers the heat from the battery pack to the liquid-cooled unit. The PCS and the liquid-cooled unit in the heat dissipation part are cooled by high-power fans, and the fans are used to transfer the heat through a ventilation duct. The advantage of this design is that the devices with large heat generation are concentrated in the same space, and more targeted heat dissipation can be carried out.

[0010] Preferably, the PCS and the liquid-cooled unit are separated by a heat dissipation partition. Because the heat dissipation of both is relatively large, being separated by the heat dissipation partition can make them in a parallel position in the heat dissipation air duct, and the exhausted hot air will not affect each other.

[0011] Furthermore, the PCS and the liquid-cooled unit respectively use their own independent fans for heat dissipation.

[0012] Even further, the ventilation duct is divided into a first ventilation duct and a second ventilation duct along the extension line of the heat dissipation partition, and the two devices with relatively large heat generation are respectively cooled by fans and supporting ventilation ducts, and there will be no problem of hot air exchanging between them.

[0013] Based on the above liquid-cooled energy storage device, a corresponding air duct structure is also designed. There is an air inlet on the first cabinet door and a heat dissipation window on the second cabinet door. When the fan is working, it sucks in cool air through the air inlet and discharges the hot air from the heat dissipation window. In order to prevent hot air from flowing back, an inner partition is added. There are through holes on the inner partition for connecting the ventilation duct. After the hot air is discharged from the ventilation duct, due to the blocking effect of the inner partition, it will not be sucked back by the fan, achieving the effect of preventing hot air from flowing back.

[0014] There is a hollow sandwich between the inner partition and the heat dissipation window. The hot air will pass through the hollow sandwich to reach the heat dissipation window. In the prior art, the ventilation duct needs to be closely attached to the heat dissipation window and the airtightness needs to be ensured to reduce the hot air reflux. However, through the design of this inner partition and the hollow sandwich, the position and size of the ventilation duct can be more flexible. The ventilation duct only needs to be connected to the through holes on the inner partition, and there are no restrictions on the position and size of the through holes. The sealing requirement between the ventilation duct and the heat dissipation window is transferred to the sealing between the inner partition and the cabinet body, which is easier to achieve compared with the sealing between the ventilation duct and the heat dissipation window.

[0015] Preferably, there is also a sealing part on the inner partition for sealing between the inner partition and the second cabinet door and the heat dissipation window.

[0016] Preferably, there are multiple through holes on the inner partition connecting different ventilation ducts. Since fans are installed at the other ends of the ventilation ducts, the hot air will not flow between the ventilation ducts. The hot air discharged from multiple ventilation ducts will jointly use the hollow sandwich and then be discharged from the heat dissipation window. This heat dissipation method can effectively utilize the space of the hollow sandwich.

[0017] Preferably, there is also a detachable inspection window on the inner partition. When the internal components are damaged, the inspection window can be directly removed for repair or replacement without removing the entire inner partition connected to the ventilation duct, which is convenient for later maintenance.

[0018] Preferably, the heat dissipation window is of a louver structure, which can prevent liquid from splashing in accidentally and causing unnecessary damage.

[0019] Preferably, there is a detachable dust-proof net on the side of the heat dissipation window close to the inner partition.

[0020] The advantages of the present invention are as follows:

[0021] 1. This air duct structure does not require the design of special-shaped ventilation ducts, nor does it require the ventilation ducts to be closely attached to the heat dissipation window, which is simpler and more convenient in production and manufacturing; since the ventilation ducts used in the air duct structure do not need to change direction, the air resistance generated by hitting the pipe wall is greatly reduced, further preventing the hot air from flowing back;

[0022] 2. The outstanding advantage of the present invention is that there is a hollow sandwich between the inner partition and the heat dissipation window. The hot air will pass through the hollow sandwich to reach the heat dissipation window. In the prior art, the ventilation duct needs to be closely attached to the heat dissipation window, and the airtightness also needs to be ensured to reduce the hot air reflux. After multiple operation experiments, it is found that even if the airtightness is enhanced, the heat dissipation effect is still very poor. However, through the design of this inner partition and the hollow sandwich, the position and size of the ventilation duct can be more flexible. The ventilation duct only needs to be directly connected to the through hole on the inner partition, and the position and size of the through hole can also be set according to the position of the ventilation duct. Similarly, after multiple actual operation experiments, it is found that this anti-hot air reflux air duct can greatly optimize the heat dissipation performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Is a perspective view (half) of the liquid-cooled energy storage device.

[0024] Figure 2 Is a rear view of the liquid-cooled energy storage device.

[0025] Figure 3 Is a cross-sectional schematic view of the anti-hot air reflux air duct. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0027] As Figure 1 and Figure 2 shown in the liquid-cooled energy storage device, including the first cabinet door 1, the air inlet 2, the energy storage part 6, the heat dissipation part 4, the heat dissipation partition 7, the independent battery 3, the cabinet body 5, the second cabinet door 9, and the heat dissipation window 10.

[0028] Both the first cabinet door 1 and the second cabinet door 9 can be opened. There is an air inlet 2 on the first cabinet door 1 and a heat dissipation window 10 on the second cabinet door 9. Both the air inlet 2 and the heat dissipation window 10 are louvers for waterproofing. The louver direction is inclined with the inside of the cabinet being higher and the outside of the cabinet being lower, which can make the water droplets hitting the air inlet 2 and the heat dissipation window 10 flow along the louver structure to the outside of the cabinet body 5.

[0029] In the liquid-cooled energy storage device shown in this embodiment, the energy storage part 6 and the heat dissipation part 4 are separated. The energy storage part 6 is used to store the battery pack, and the heat generated by the battery pack is concentrated in the heat dissipation part 4 through the liquid-cooled pipeline. The heat dissipation part 4 is further divided into two parts by the heat dissipation partition 7. A liquid-cooled unit is installed above the heat dissipation partition 7, and a power converter is installed below the heat dissipation partition 7. Both are equipped with independent cooling fans.

[0030] Preferably, there is also an independent battery 3 in the heat dissipation part 4, which can prevent device damage caused by the inability to discharge heat when a sudden power outage occurs.

[0031] Preferably, a master control button is also installed below the air inlet 2. The master control button can emit light and can be directly started through the master control button on the first cabinet door 1. The master control button can also display the current working status by emitting light, such as green light for normal operation, yellow light for fault, and red light for shutdown status.

[0032] like Figure 3 The hot air backflow prevention air duct shown includes an upper air duct 12 , a lower air duct 13 , an inner partition 11 , a heat dissipation window 10 , a second cabinet door 9 , a first cabinet door 1 , an air inlet 2 and a cabinet body 5 .

[0033] Relatively cold air will be sucked in from the air inlet 2 on the first cabinet door 1, and then the upper air duct 12 and the lower air duct 13 are used to receive the hot air blown out by the independent fans of the liquid cooling unit and the power converter respectively, and then sent to the hollow interlayer 14 between the inner partition 11 and the heat dissipation window 10 through the through holes on the inner partition 11, and finally discharged out of the cabinet through the heat dissipation window 10 on the second cabinet door 9.

[0034] This heat dissipation air duct adopts a straight air duct and ventilation duct (upper air duct 12 and lower air duct 13), which reduces the resistance caused by the air hitting the wall when turning. In addition, by adding an inner partition 11, the sealing requirement between the ventilation duct and the heat dissipation window 10 is transferred to between the inner partition 11 and the cabinet 5, and the coupling relationship between the ventilation duct and the heat dissipation window 10 is released, so that the opening position and size of the ventilation duct are more flexible, and the ventilation and heat dissipation effect is better.

[0035] After multiple long-term actual operation tests, this heat dissipation duct can effectively reduce the temperature in the cabinet 5 and prevent hot air from flowing back, especially effectively reducing the temperature in the heat dissipation part 4.

[0036] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0037] Although the above describes the specific implementation methods of the present invention, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An energy storage liquid cooling device with an anti-hot air reflux air duct, comprising a cabinet body. There is a first cabinet door on the front of the cabinet body, and a second cabinet door on the back of the cabinet body. Inside the cabinet body, there is an energy storage part and a heat dissipation part. The heat dissipation part includes a liquid cooling unit. The energy storage part transfers heat to the liquid cooling unit in the heat dissipation part through a liquid cooling pipe. It is characterized in that Using the anti-hot air reflux air duct for heat dissipation, an air inlet window is installed on the first cabinet door, and a heat dissipation window is installed on the second cabinet door. There is an inner partition installed parallel to the first cabinet door and the second cabinet door inside the cabinet body. The air inlet window, the heat dissipation window, and the inner partition are located at the same horizontal position. A hollow sandwich is formed between the inner partition and the heat dissipation window on the second cabinet door. There are through holes on the inner partition, and a ventilation duct is tightly connected to the through holes. The other end of the ventilation duct is installed with a fan, and the ventilation duct has no bends. The heat dissipation part includes multiple heating components, and the heating components are separated by heat dissipation partitions. Each heating component is equipped with an independent ventilation duct and a fan. The ventilation ducts are separated along the extension line of the heat dissipation partition and are respectively connected to the corresponding through holes on the inner partition.

2. The energy storage liquid cooling device with a hot air reflux prevention air duct according to claim 1, characterized in that, There is a detachable maintenance window on the inner partition.

3. The energy storage liquid cooling device with a hot air reflux prevention air duct according to claim 1, characterized in that, The heat dissipation window and the air inlet window are of louver structure.

4. The energy storage liquid cooling device with a hot air reflux prevention air duct according to claim 1, characterized in that, Detachable dust-proof nets are also installed on the heat dissipation window and the air inlet window.

5. The energy storage liquid cooling device with a hot air reflux prevention air duct as claimed in claim 1, wherein There is a sealing part on the inner partition for sealing with the second cabinet door and the heat dissipation window.

6. The energy storage liquid cooling device with a hot air reflux prevention air duct according to claim 1, characterized in that, The heat dissipation part also includes an independent power supply, and the independent power supply is connected to the fan.

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