Mine high-efficiency liquid-cooled energy storage battery cabin

Abstract

The application discloses a kind of mine high-efficiency liquid cooling energy storage battery cabin, belongs to energy storage battery cabin field.The present application includes cabinet, and storage rack for storing liquid cooling battery pack and liquid cooling system are installed in cabinet;Liquid cooling system includes water circulation device, and the both ends of water circulation device are communicated with return water pipe and water outlet pipe respectively, and return water pipe and water outlet pipe are connected in the liquid inlet and liquid outlet of liquid cooling battery pack by branch pipe one and branch pipe two respectively;Liquid cooling system further includes refrigeration subsystem, and refrigeration subsystem includes compressor, condenser, expansion valve and evaporator connected in sequence, and evaporator is installed in the inside of water circulation device.The compressor of the present application compresses low-temperature low-pressure refrigerant into high-temperature high-pressure gas, and after heat dissipation through condenser, low-temperature low-pressure liquid refrigerant is throttled by expansion valve, and heat exchange occurs with high-temperature cooling liquid in cooling cavity in evaporator;Active cooling of circulating cooling liquid is realized, and the limitation that traditional passive liquid cooling only transfers heat without cooling is broken through.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery compartments, and in particular to a high-efficiency liquid-cooled energy storage battery compartment for mining applications. Background Technology

[0002] With the advancement of intelligent coal mine construction, mine energy storage systems are playing an increasingly important role in emergency power supply, equipment start-up and shutdown buffering, and renewable energy consumption. However, the mine working environment is characterized by the accumulation of flammable and explosive gases (such as methane and dust), confined spaces with limited ventilation, and high dust concentrations, which places stringent requirements on the safety and thermal management efficiency of energy storage battery compartments.

[0003] The high ambient temperature and low air convection heat transfer coefficient in mines make it difficult to quickly dissipate the large amount of heat generated during battery charging and discharging. This can easily lead to significant temperature differences between battery modules, affecting battery consistency and accelerating battery aging. To ensure heat dissipation, temperature control solutions for energy storage batteries are mainly divided into two categories: air cooling and liquid cooling. Although air cooling systems are simple in structure, their cooling efficiency is insufficient for high-power battery clusters due to the low air convection heat transfer coefficient and high levels of dust in the confined space of mines. In contrast, liquid cooling systems are gradually gaining popularity due to their high heat exchange efficiency and low noise.

[0004] However, existing liquid-cooled energy storage systems for mining rely solely on water pumps to drive the coolant circulation within the battery pack, a method known as passive liquid cooling. This approach only transfers the heat generated by the battery to the circulating water, lacking effective cooling of the heated water. In the high-temperature environment of mines, the temperature of the circulating water continues to rise after absorbing heat from the battery. Without a cooling device, the heat exchange temperature difference will decrease, ultimately causing the battery to operate in a high-temperature range for extended periods, severely impacting battery life and even posing a risk of thermal runaway. Summary of the Invention

[0005] This invention provides a high-efficiency liquid-cooled energy storage battery compartment for mining, which can solve the problem that passive liquid cooling in the prior art cannot continuously and effectively reduce temperature.

[0006] A high-efficiency liquid-cooled energy storage battery compartment for mining includes a cabinet, inside which a storage rack for storing liquid-cooled battery packs and a liquid-cooling system are installed. The liquid-cooling system includes a water circulation device, with a return water pipe and an outlet water pipe connected to its two ends respectively. The return water pipe and the outlet water pipe are connected to the liquid inlet and outlet of the liquid-cooled battery pack via branch pipe one and branch pipe two respectively. The liquid-cooling system also includes a refrigeration subsystem, which includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence. The evaporator is installed inside the water circulation device.

[0007] Furthermore, the bottom of the cabinet is divided into a battery storage cavity, a second device cavity, and a first device cavity from top to bottom by two partitions, and the storage rack is installed in the battery storage cavity.

[0008] Furthermore, the return water pipe and the outlet water pipe are respectively installed in the cabinets on both sides of the storage rack.

[0009] Furthermore, the water circulation device is installed above a partition in the second equipment cavity; the water circulation device includes a housing, one end of which is provided with a vertical plate, which separates a pumping cavity and a cooling cavity. A water pump is installed in the pumping cavity, and the water pump is connected to a water outlet connector located on one side of the pumping cavity. The water outlet connector is connected to one end of a water outlet pipe. An opening connecting the pumping cavity and the cooling cavity is provided at the bottom of the vertical plate. A return water connector is provided at the top of one end of the cooling cavity, and the return water connector is connected to one end of a return water pipe. The evaporator is installed in the cooling cavity.

[0010] Furthermore, the cooling chamber is equipped with staggered first and second horizontal plates, and the interior of the cooling chamber forms an S-shaped flow channel through the first and second horizontal plates.

[0011] Furthermore, the compressor and condenser are installed inside the first equipment cavity, and several air vents are respectively opened on the opposite side walls of the first equipment cavity; wherein, a fan is installed at one of the air vents on the inner wall of the first equipment cavity, and the fan draws air from outside the cabinet into the cabinet.

[0012] Furthermore, a filter screen is installed at the air outlet where the fan is installed, and the condenser is located between the compressor and the fan.

[0013] Furthermore, the condenser includes a mounting frame, in which a disc-shaped condenser tube is installed. The two ends of the condenser tube are respectively connected to a distribution pipe and a collection pipe, and the distribution pipe and the collection pipe are respectively connected to a compressor and an expansion valve.

[0014] Furthermore, it also includes a cleaning mechanism, which includes a rodless cylinder and a movable plate fixed on the slider of the rodless cylinder. The movable plate is provided with openings that mate with the condenser tubes one by one, and a cleaning ring that slides along the condenser tube is installed at the opening.

[0015] Furthermore, the number of openings is at least two rows, and each row of openings has a guide plate with inclined ends on both sides of the movable plate below it. The guide plate has an upwardly protruding water-blocking edge on the side away from the movable plate. The two inclined ends of the guide plate are arranged in a figure-eight shape.

[0016] This invention provides a liquid cooling system that integrates an independent refrigeration subsystem, comprising a compressor, condenser, expansion valve, and evaporator connected in sequence, with the evaporator directly embedded inside the water circulation device. The compressor compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gas, which, after being cooled by the condenser, is throttled by the expansion valve into a low-temperature, low-pressure liquid refrigerant. This liquid refrigerant then exchanges heat with the high-temperature coolant in the cooling chamber within the evaporator, achieving active cooling of the circulating coolant and overcoming the limitation of traditional passive liquid cooling which only transfers heat without cooling. This ensures that the coolant maintains a suitable temperature in the high-temperature environment of mines, preventing the heat exchange efficiency from decreasing due to the increase in circulating water temperature, and keeping the liquid-cooled battery pack always operating within the optimal temperature range of 25-40°C. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the energy storage battery compartment provided by the present invention; Figure 2 Provided by the present invention Figure 1 Side view; Figure 3 Provided by the present invention Figure 3 Sectional view at point AA; Figure 4 This is a schematic diagram of the water circulation device provided by the present invention; Figure 5 This is a schematic diagram of the condenser provided by the present invention; Figure 6 This is a magnified view of part A in Figure 5 provided by the present invention.

[0018] Explanation of reference numerals in the attached figures: 1-Cabinet, 2-Water circulation device, 3-Condenser, 4-Compressor, 10-Air outlet, 11-First equipment chamber, 12-Second equipment chamber, 13-Battery storage chamber, 14-Outlet pipe, 15-Return pipe, 16-Storage rack, 17-Fan, 18-Partition, 20-Box, 21-Vertical plate, 22-First horizontal plate, 23-Evaporator, 24-Water pump, 25-Second horizontal plate, 30-Fixed frame, 31-Condensing pipe, 32-Movable plate, 33-Rodless cylinder, 34-Distribution pipe, 35-Gathering pipe, 36-Guide plate, 37-Water baffle, 38-Cleaning ring, 100-Liquid-cooled battery pack, 201-Outlet connector, 202-Return connector. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0020] Example 1 Mining environments are characterized by high temperatures and poor ventilation. Existing mining liquid-cooled energy storage systems mostly adopt a passive liquid-cooling mode, which only uses a water pump to drive the coolant to circulate in the battery pack. There is no active cooling structure, which causes the temperature of the circulating water to rise continuously after absorbing heat from the battery. The heat exchange temperature difference gradually narrows, ultimately causing the battery to work in the high-temperature range for a long time, which seriously affects its lifespan and may even lead to thermal runaway.

[0021] like Figures 1 to 4 As shown in the figure, an embodiment of the present invention provides a high-efficiency liquid-cooled energy storage battery compartment for mining, including a cabinet 1. The bottom of the cabinet 1 is divided from top to bottom into a battery storage cavity 13, a second equipment cavity 12, and a first equipment cavity 11 by two partitions 18. A storage rack 16 is installed in the battery storage cavity 13 for storing multiple liquid-cooled battery packs 100. A water circulation device 2 is installed in the second equipment cavity 12, and a compressor 4 and a condenser 3 are installed in the first equipment cavity 11.

[0022] The liquid cooling system includes a water circulation device 2 and a refrigeration subsystem. The refrigeration subsystem consists of a compressor 4, a condenser 3, an expansion valve, and an evaporator 23 connected in sequence. The evaporator 23 is installed inside the water circulation device 2. The two ends of the water circulation device 2 are connected to a return water pipe 15 and an outlet water pipe 14, respectively. The return water pipe 15 and the outlet water pipe 14 are respectively arranged in the cabinets 1 on both sides of the storage rack 16, and are connected to the liquid inlet and liquid outlet of each liquid-cooled battery pack 100 through branch pipe one and branch pipe two.

[0023] Its working principle is as follows: the heat generated by the charging and discharging of the liquid-cooled battery pack 100 is transferred to the internal coolant. The heated coolant flows into the return water pipe 15 through the branch pipe 1 and enters the cooling chamber of the water circulation device 2 through the return water connector 202. The refrigerant is compressed by the compressor 4 and enters the condenser 3 to dissipate heat. After being throttled and cooled by the expansion valve, it enters the evaporator 23 and exchanges heat with the high-temperature coolant in the cooling chamber, thereby reducing the temperature of the coolant. The cooled coolant is then pumped back into the liquid-cooled battery pack 100 through the outlet connector 201, the outlet pipe 14 and the branch pipe 2, completing the circulating heat exchange.

[0024] It should be emphasized that the core improvement of this embodiment is: on the basis of the traditional liquid cooling cycle, an active cooling subsystem including compressor 4, condenser 3, expansion valve and evaporator 23 is added. The evaporator 23 directly cools the circulating coolant, which solves the problem of the passive liquid cooling heat exchange efficiency decay in the high temperature environment of the mine, and ensures that the liquid-cooled battery pack 100 always works in a suitable temperature range.

[0025] Example 2 It is understandable that in Embodiment 1, the condenser 3 is installed in the first equipment chamber 11 near the mine roadway. The air in the roadway has a high dust content. After long-term use, a large amount of dust will adhere to the fins and condenser tubes 31 of the condenser 3, resulting in a significant decrease in heat exchange efficiency. If it is cleaned manually on a regular basis, not only will the maintenance cost be high, but it will also affect the continuous operation of the energy storage system.

[0026] To address the issue of decreased heat exchange efficiency caused by ash buildup in condenser 3, such as... Figure 5-6 As shown, in this embodiment, an automatic cleaning mechanism is added to the condenser 3; the condenser 3 includes a fixing frame 30, and a disc-shaped condenser tube 31 is installed in the fixing frame 30. The two ends of the condenser tube 31 are respectively connected to the distribution pipe 34 and the collection pipe 35. The distribution pipe 34 is connected to the outlet of the compressor 4, and the collection pipe 35 is connected to the inlet of the expansion valve.

[0027] The cleaning mechanism includes a rodless cylinder 33 and a movable plate 32 fixed on the slider of the rodless cylinder 33. The movable plate 32 has openings that mate with the condenser tubes 31 one by one. Each opening is equipped with a cleaning ring 38 that slides along the outer wall of the condenser tube 31. The cleaning ring 38 can be made of wear-resistant rubber or a brush material.

[0028] Its working process is as follows: When the system detects that the heat exchange efficiency of the condenser 3 drops to a preset threshold (such as the temperature difference between the inlet and outlet air is less than 5℃), the rodless cylinder 33 is started, driving the movable plate 32 to move back and forth along the length of the condenser tube 31, and the cleaning ring 38 scrapes off the dust attached to the surface of the condenser tube 31; a fan 17 is installed at the air vent 10 on one side of the inner wall of the first equipment chamber 11. The fan 17 draws air from outside the cabinet 1 into the first equipment chamber 11, flows through the condenser 3 and is discharged from the air vent 10 on the other side. At the same time, the airflow carries the scraped dust out of the cabinet 1, realizing online cleaning; the filter screen installed at the air vent 10, which is the air inlet end, can initially intercept large dust particles and reduce the dust accumulation rate of the condenser 3.

[0029] To control the start-up of the rodless cylinder 33, temperature sensors are installed on the air inlet and outlet sides of the condenser 3 to detect the air inlet and outlet temperatures. Under clean conditions, the temperature difference between the air inlet and outlet sides is within a preset threshold. When the temperature difference is consistently lower than the preset threshold, it indicates that coal dust adheres severely to the surface of the condenser 3, obstructing airflow and reducing heat exchange efficiency. The temperature sensor signals are connected to the controller inside the chamber, which performs comparison and judgment.

[0030] It should be emphasized that the core improvement of this embodiment is that by setting up a movable plate 32 with a cleaning ring 38 and a rodless cylinder 33, the condenser 3 can be automatically cleaned online without the need for manual maintenance during shutdown. This is suitable for the high dust working environment of mines, ensures the heat exchange efficiency of the condenser for a long time, and guarantees the stable operation of the liquid cooling system.

[0031] Example 3 It is understandable that when the cleaning ring 38 scrapes away dust in Embodiment 2, the dust on the surface of the condenser tube 31 may carry moisture due to the humid air underground. As a result, the dust on the surface of the upper condenser tube 31 will fall directly downwards under the scraping action of the cleaning ring 38. If the dust is not blocked from falling due to gravity, the falling dust will re-adhere to the lower condenser tube 31, affecting the overall cleaning effect.

[0032] To solve the problem of secondary pollution in the above cleaning process, the openings on the movable plate 32 of the present invention are set in three rows. The upper two rows of openings are fixed on both sides of the movable plate 32. The side of the guide plate 36 away from the movable plate 32 is provided with an upwardly protruding water-blocking edge 37, and the two ends of the guide plate 36 are set as inclined parts, and the two inclined parts are arranged in a figure-eight shape.

[0033] Its working effect is as follows: during the cleaning process, the scraped dust falls directly onto the surface of the guide plate 36 for collection, avoiding it from falling directly onto the condenser tube 31 below; the figure-eight shaped inclined part can guide the falling dust during cleaning, so that it is cleaned out from both ends of the guide plate 36, and the cleaned dust is discharged from the bottom end of the inclined part; in order to collect the cleaned dust, a collection box is provided on the bottom side of the first equipment cavity 11 below the condenser 3. The collection box collects the dust discharged from the bottom end of the inclined part, making it convenient to periodically remove the collection box from the first equipment cavity 11 for cleaning during use.

[0034] Meanwhile, in order to improve the cleaning effect, a spray pipe is provided on the inner top side of the first equipment cavity 11. The spray pipe is provided with spray holes, which can use spray water to wash the dust on the surface of the condenser tube 31, thereby improving the cleaning effect. After the surface of the condenser tube 31 is washed with spray water, water adheres to the surface of the condenser tube 31. When the cleaning ring 38 scrapes off the dust on the surface of the condenser tube 31, the water on the surface of the condenser tube 31 is also scraped off. At this time, the droplets fall onto the guide plate 36, and then are guided by the inclined part.

[0035] It should be emphasized that the core improvement of this embodiment lies in the fact that the directional collection and guidance of cleaning dust is achieved through the cooperation of the figure-eight shaped guide plate 36 and the water-blocking edge 37.

[0036] Example 4 In actual operation, it is necessary to dissipate heat from the compressor 4 and the condenser 3. Based on this, several air vents 10 are opened on the opposite side walls of the first equipment cavity 11. A fan 17 is installed on one side air vent 10. The fan 17 draws fresh air from outside the cabinet 1 into the first equipment cavity 11, flows through the condenser 3 and is discharged from the other side air vent 10, forming an independent equipment cavity heat dissipation air path, which is completely isolated from the battery storage cavity 13.

[0037] When the fan 17 is working, it draws the low-temperature ambient air into the first equipment cavity 11 from the air outlet 10 on one side. Under the action of the fan, the airflow is controlled to pass horizontally through the condenser 3 and the compressor 4 to cool down the compressor 4 and the condenser 3. At this time, the heat-absorbing air is discharged from the air outlet 10 on the other side of the first equipment cavity 11.

[0038] Meanwhile, the water circulation device 2 is installed above a partition 18 inside the second equipment cavity 12; the water circulation device 2 includes a box 20, with a vertical plate 21 at one end of the box 20, which separates the pumping cavity and the cooling cavity. A water pump 24 is installed in the pumping cavity, and the water pump 24 is connected to a water outlet connector 201 located on one side of the pumping cavity. The water outlet connector 201 is connected to one end of the water outlet pipe 14; the bottom of the vertical plate 21 has an opening connecting the pumping cavity and the cooling cavity; the cooling cavity of the water circulation device 2 is equipped with staggered first horizontal plates 22 and second horizontal plates 25, which form an S-shaped flow channel inside the cooling cavity to facilitate the entry of water.

[0039] It should be emphasized that the core improvement of this embodiment lies in: the S-shaped flow channel facilitates the cooling of the circulating cooling water entering the cooling chamber of the housing 20, preventing water mixing; such as Figure 4 As shown, the evaporator 23 is fixed in an S-shaped flow channel close to the opening, that is, the evaporator 23 cools the cooling water that is about to enter the pumping chamber, thereby reducing the temperature of the cooling water entering the pumping chamber.

[0040] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A high-efficiency liquid-cooled energy storage battery compartment for mining, characterized in that, Includes a cabinet (1), in which a storage rack (16) for storing a liquid-cooled battery pack (100) and a liquid cooling system are installed; The liquid cooling system includes a water circulation device (2), the two ends of which are connected to a return water pipe (15) and an outlet water pipe (14), respectively. The return water pipe (15) and the outlet water pipe (14) are connected to the liquid inlet and liquid outlet of the liquid-cooled battery pack (100) through branch pipe one and branch pipe two, respectively. The liquid cooling system also includes a refrigeration subsystem, which includes a compressor (4), a condenser (3), an expansion valve and an evaporator (23) connected in sequence. The evaporator (23) is installed inside the water circulation device (2).

2. The high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 1, characterized in that, The bottom of the cabinet (1) is divided into a battery storage cavity (13), a second equipment cavity (12) and a first equipment cavity (11) from top to bottom by two partitions (18), and the storage rack (16) is installed in the battery storage cavity (13).

3. The high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 2, characterized in that, The return water pipe (15) and the outlet water pipe (14) are respectively installed in the cabinets (1) on both sides of the storage rack (16).

4. The high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 2, characterized in that, The water circulation device (2) is installed above a partition (18) inside the second equipment cavity (12); The water circulation device (2) includes a box (20), a vertical plate (21) is provided at one end of the box (20), and a pumping chamber and a cooling chamber are formed by the vertical plate (21). A water pump (24) is installed in the pumping chamber. The water pump (24) is connected to a water outlet connector (201) provided on one side of the pumping chamber. The water outlet connector (201) is connected to one end of the water outlet pipe (14). The bottom of the vertical plate (21) is provided with an opening that connects the pumping chamber and the cooling chamber; A return water connector (202) is provided at the top of one end of the cooling chamber, and the return water connector (202) is connected to one end of the return water pipe (15); the evaporator (23) is installed inside the cooling chamber.

5. A high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 4, characterized in that, The cooling chamber is equipped with a first horizontal plate (22) and a second horizontal plate (25) arranged in an alternating manner, and an S-shaped flow channel is formed inside the cooling chamber through the first horizontal plate (22) and the second horizontal plate (25).

6. The high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 2, characterized in that, The compressor (4) and condenser (3) are installed in the first equipment cavity (11), and several air vents (10) are opened on the opposite side walls of the first equipment cavity (11). A fan (17) is installed at the air vent (10) on the inner wall of the first equipment cavity (11), and the fan (17) draws air from outside the cabinet (1) into the cabinet (1).

7. A high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 6, characterized in that, A filter screen is installed at the air outlet (10) where the fan (17) is installed, and the condenser (3) is located between the compressor (4) and the fan (17).

8. A high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 6 or 7, characterized in that, The condenser (3) includes a mounting bracket (30), in which a disc-shaped condenser tube (31) is installed. The two ends of the condenser tube (31) are respectively connected to a distribution pipe (34) and a collection pipe (35). The distribution pipe (34) and the collection pipe (35) are respectively connected to a compressor (4) and an expansion valve.

9. A high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 8, characterized in that, It also includes a cleaning mechanism, which includes a rodless cylinder (33) and a movable plate (32) fixed on the slider of the rodless cylinder (33). The movable plate (32) is provided with openings that mate with the condenser tubes (31) one by one, and a cleaning ring (38) that slides along the condenser tubes (31) is installed at the openings.

10. A high-efficiency liquid-cooled energy storage battery compartment for mining as described in claim 9, characterized in that, The number of openings is at least two rows. Each row of openings has a guide plate (36) with inclined ends on both sides of the movable plate (32) below it. The guide plate (36) has an upwardly protruding water-blocking edge (37) on the side away from the movable plate (32). The two inclined portions at both ends of the guide plate (36) are arranged in a figure-eight shape.

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