Filtration device for immersion silicone oil coolant for lithium batteries

Abstract

This utility model belongs to the field of immersion coolant production technology, and relates to a filtration device for immersion silicone oil coolant used in lithium batteries. Specifically, it is a filtration device suitable for the production of immersion coolant products with high dielectric strength requirements. The device includes a filter tank, which comprises an outer shell. Inside the outer shell, there are a mixing chamber, a filter plate, and a filtrate chamber, with the mixing chamber and filtrate chamber positioned opposite each other on either side of the filter plate. It also includes a vacuum pump. The filter tank has an outlet at the bottom of the filtrate chamber, which connects to the vacuum pump and the filtrate chamber. Finally, it includes a storage tank connected between the filter tank and the vacuum pump. The filtrate chamber of the filter tank is connected to the storage tank and the vacuum pump via the outlet. This device can form a sealed space, isolating air and reducing the mixing of water vapor and dust into the coolant material, thereby reducing damage to dielectric strength and purity. The device is also simple in composition and easy to operate.

Description

Technical Field

[0001] This utility model belongs to the field of immersion coolant production filtration technology, and relates to a filtration device for producing coolants with high dielectric strength requirements. Background Technology

[0002] With the widespread application of submerged silicone oil coolant technology in energy storage systems, new energy vehicles, data centers, and other fields, increasingly higher requirements are being placed on the performance indicators of coolants. Among these requirements, the dielectric strength of the coolant needs to be controlled at a lower level to meet the safe and stable operation needs of equipment in these fields. However, in current industrial applications, traditional coolant filtration devices are still pressure filter filtration equipment. This type of filtration separates solids from liquids in a suspension by applying pressure. The suspension is pumped to the filter press body by a high-pressure feed pump. Under pressure, the suspension enters the filter chamber, the liquid passes through the filter cloth and is discharged through the guide channel, while the solids are retained to form a filter cake, such as CN2. Standards such as 01320559458.1, CN201320559234.0, and CN202310999152.6 all employ pressure filtration to remove impurities from coolant. However, such filtration devices have a significant drawback: during filtration, the coolant comes into direct contact with the air, absorbing moisture and reducing its dielectric strength. Furthermore, dust and other impurities may be introduced, leading to a decrease in purity and impacting the equipment's operational safety and lifespan. Therefore, this type of filtration equipment is suitable for coolant products with low requirements for dielectric strength and purity, but it is unsuitable for applications with stringent requirements for these properties.

[0003] In summary, there is a current need to develop a filtration device suitable for the production of immersion silicone oil coolant that can minimize contact with air and reduce the intake of water vapor during coolant filtration, thereby obtaining coolant products that meet dielectric strength requirements. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an immersion-type silicone oil coolant filtration device:

[0005] like Figure 1-2 As shown:

[0006] The system includes a filter tank 2. The filter tank 2 includes an outer shell, inside which are disposed a mixing chamber, a filter element, and a filtrate chamber 221. The mixing chamber and the filtrate chamber 221 are disposed opposite to each other on both sides of the filter element. The outer shell is used to seal the mixing chamber, the filter element, and the filtrate chamber 221, isolating them from the external environment. During the filtration of the coolant, it can prevent external air from entering the chamber, thus preventing the coolant from mixing with water vapor, dust, etc.

[0007] Specifically, the number of filter tanks 2 can be adjusted according to production needs;

[0008] Specifically, the filter is a commonly used filter for filtering impurities in coolant, such as filter paper, filter cloth, or filter screen. The material, shape, size, and number of layers of the filter can be adjusted according to requirements. Preferably, the filter is filter cloth or filter paper, which can perform fine filtration with a smaller mesh size. During filtration, the mixture chamber is filled with a mixture, and the filter can trap particulate impurities. Finally, the filter residue will remain in the mixture chamber, while the filtrate will enter the filtrate chamber 221.

[0009] The filtration device also includes a vacuum pump 31. The filter tank 2 is also provided with a liquid outlet at the bottom of the filtrate chamber 221. The liquid outlet is used not only for vacuuming but also for discharging the filtrate. The liquid outlet is connected to the vacuum pump 31 and the filtrate chamber 221.

[0010] The filtration device also includes a storage tank 3 connected between the filter tank 2 and the vacuum pump 31. The filtrate chamber 221 of the filter tank 2 is connected to the storage tank 3 and the vacuum pump 31 in sequence via the liquid outlet. By using the filtration device to form a sealed space, and in conjunction with vacuuming, the air inside the filtration device can be removed in advance, preventing the coolant from drawing in water vapor.

[0011] Furthermore, such as Figure 2-3 As shown:

[0012] The filter tank 2 has an upper and lower split structure. The mixing chamber is located in the upper split, and the filtrate chamber 221 is located in the lower split. The filter sheet can be detachably installed on the lower split, which makes it easy to disassemble the filter tank 2 for cleaning and maintenance.

[0013] A sealing structure is also provided between the upper and lower parts 22, so that the outer shell of the filter tank 2 can still isolate the external environment even after the parts are separated.

[0014] The sealing structure includes a groove on the surface of the lower split 22, a sealing ring 23 installed in the groove, an upper split shell that presses the sealing ring 23 and inserts into the groove, and a locking component that fixes the upper split and the lower split. The outer shell of the filter tank 2 is locked to isolate the external environment.

[0015] The surface of the lower split 22 is also provided with a flow channel, which is located on the outer periphery of the sealing structure. It is an annular groove that is recessed from the surface of the lower split 22 inward, and is used to prevent the overflow of residue after disassembly.

[0016] A support member is also provided between the filtrate chamber 221 of the lower part 22 and the filter plate to support the filter plate and cooperate with it to form a stable mixture chamber and filtrate chamber 221. The support member is located inside the filtrate chamber 221.

[0017] The supporting component can be a bracket, which includes a disc located on the surface and legs for supporting the disc and fixed to the inner wall of the filtrate chamber 221. The fixing method is welding. Figure 2 As shown in the left figure; a boss extending inward along the periphery of the filtrate chamber 221 from the lower part 22, used to provide support near the center of the filter element, or eliminating the need for a support bracket, is used to provide support around the filter element. Figure 2 As shown in the right figure;

[0018] A support plate 241 is also provided between the support structure and the filter plate to provide overall support on the bottom surface of the filter plate in conjunction with the bracket. The support plate 241 is made of metal, preferably stainless steel. The support plate 241 is provided with channels and bosses, which are alternately distributed. Specifically, they are alternately distributed outward from the center position of the support plate 241. The channels are used for the flow of filtrate, and the bosses are used to support the filter plate. The number and size of the channels and bosses can be adjusted according to actual needs.

[0019] Furthermore, such as Figure 4 As shown, in the filtration device:

[0020] A one-way filtrate pipe 21 is also provided. The front end of the one-way filtrate pipe 21 is connected to the outlet of the filter tank 2, and the end end is connected to the storage tank 3. The front end of the one-way filtrate pipe 21 is positioned higher than the end in the horizontal direction to prevent filtrate backflow. When there are two or more filter tanks 2, a corresponding one-way filtrate pipe 21 is configured for each. Each filter tank 2 is connected in parallel to the storage tank 3 through the corresponding one-way filtrate pipe 21.

[0021] The one-way filtrate pipeline 21 is also equipped with a valve 211, which is used to open or close the connection between the vacuum pump 31, the storage tank 3 and the filter tank 2.

[0022] The storage tank 3 is provided with upper and lower cavities. The upper cavity is a vacuum chamber, and the lower cavity is a storage chamber for storing liquid. The storage chamber is provided with an inlet on the side of the storage tank 3 that connects to the end of the one-way filtrate pipe 21, and an exhaust port that connects to the vacuum pump 31 is provided at the top of the vacuum chamber. The position of the inlet is higher than the storage chamber and lower than the exhaust port in the horizontal direction. This allows the vacuum chamber to remain connected to the inlet during the filtration process, and the vacuum pump 31 can continuously evacuate the one-way filtrate pipe 21 and the filter tank 2. During the filtration process, the vacuum pump 31 evacuates the filtrate pipe 21, creating a pressure difference between the mixture chamber and the filtrate chamber 221. The filtrate chamber 221 is under negative pressure relative to the mixture chamber, which causes the filtrate chamber 221 to exert suction on the mixture, accelerating the separation of the filtrate.

[0023] The filter tank 2 is also provided with a feed inlet, which is located at the top of the mixing chamber to facilitate the feeding of the mixture into the filter tank 2.

[0024] Furthermore, such as Figure 1 As shown:

[0025] The filter device is used to filter the mixture during the production of silicone oil coolant. The mixture also contains activated carbon adsorption material. The uniform mixing of activated carbon in the mixture helps to adsorb impurities such as ammonia and organic pigments.

[0026] The aforementioned filtration device is used to recover filtered coolant in lithium battery systems. After prolonged use in lithium battery systems, submerged coolant will exhibit increased impurities and darkening of color, making it unusable. Recovering the coolant and filtration it allows for reuse. Lithium battery systems are essential for applications requiring high dielectric strength and purity, such as new energy electric vehicles, energy storage devices, 5G communication base stations, and high-performance computing equipment.

[0027] Compared with the prior art, the filtration device provided by this utility model has the following beneficial effects:

[0028] First, it can form a closed space, isolate air, and reduce the mixing of water vapor and dust into the coolant material, thereby reducing the damage to dielectric strength and purity; second, it consists of multiple simple functional devices and is easy to operate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the first structure of the immersion coolant filtration device of this utility model;

[0030] Figure 2 This is a schematic diagram of the central cross-section of the filter tank after it has been separated in the immersion coolant filtration device of this utility model.

[0031] Figure 3 This is a schematic diagram of the structure of the support plate in the immersion coolant filtration device of this utility model;

[0032] Figure 4 This is a schematic diagram of the second structure of the immersion coolant filtration device of this utility model. Detailed Implementation

[0033] Preparation of the mixture: 1 part of dimethylsiloxane mixed cyclic compound (commercially available DMC), 1.2 parts of hexamethyldisiloxane end-capping agent were mixed, and 0.002 parts of tetramethylammonium hydroxide catalyst were added. The reaction temperature was maintained at 110℃, and the polymerization reaction was carried out for 4 hours; S2, the mixture was heated to remove impurities, and samples were taken to test the dielectric strength of the mixture. The dielectric strength before filtration in the example is recorded in Table 1.

[0034] Example

[0035] Filtration of the mixture: Add activated carbon to the material and stir to mix; then, using the filtration device of this utility model, separate and filter the coolant mixture containing activated carbon in the filter tank and store it in the storage tank. When the filtration time reaches 55 minutes, take a sample from the middle layer to test the dielectric strength of the filtrate, which is the dielectric strength after filtration in the example, and record it in Table 1.

[0036] Comparative Example

[0037] Filtration of the mixture: Add activated carbon to the material and stir to mix; then, use a traditional filter press (Dibo small filter press, XAMY20-40 / 630-30U, filter area 2 square meters) for filtration. When the filtration time reaches 55 minutes, take a sample from the middle layer of the filtrate to test the dielectric strength as the dielectric strength after comparative filtration, and record it in Table 1.

[0038] Test methods

[0039] 1. Dielectric strength: Refer to GB / T 507-1986 standard "Determination of Dielectric Strength of Insulating Oil" and use an insulating oil dielectric strength tester for testing.

[0040] 2. Time: Metal stopwatch.

[0041] Test Results

[0042] Table 1

[0043] Item Example Comparative Example Filtering time / min 55 55 Dielectric strength before filtration / KV 35 35 Dielectric strength after filtration / KV 34 27

[0044] The coolant product of this utility model has a dielectric strength ≥30KV, making it a suitable immersion coolant for lithium batteries. In addition, it also possesses the following advantages:

[0045] Compared with the existing pressure filtration technology in the comparative example, the dielectric strength loss before and after filtration in this embodiment is 1kV, while that in the comparative example is 8kV. In comparison, the filter device of this utility model has very little impact on the dielectric strength of the coolant during filtration, and the dielectric strength after filtration is still greater than 30kV, while that in the comparative example is lower than 30kV, which does not meet the product use requirements. It can be seen that the filter device of this utility model has a good air isolation effect and can effectively ensure that the dielectric strength is not lost during the filtration process, making it very suitable for application fields with higher requirements for dielectric strength.

Claims

1. A filtration device for immersion-type silicone oil coolant for lithium batteries, characterized in that: It includes a filter tank (2), the filter tank (2) includes an outer shell, and the inner shell is provided with a mixing chamber, a filter plate and a filtrate chamber (221), the mixing chamber and the filtrate chamber (221) are arranged opposite to each other on both sides of the filter plate; It also includes a vacuum pump (31); the filter tank (2) is also provided with a liquid outlet at the bottom of the filtrate chamber (221), and the liquid outlet is connected to the vacuum pump (31) and the filtrate chamber (221). It also includes a storage tank (3), which is connected between the filter tank (2) and the vacuum pump (31). The filtrate chamber (221) of the filter tank (2) is connected to the storage tank (3) and the vacuum pump (31) in sequence via the outlet.

2. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 1, characterized in that: The filter tank (2) has an upper and lower split structure. The mixing chamber is located in the upper split, and the filtrate chamber (221) is located in the lower split. The filter sheet can be detachably installed on the lower split. A sealing structure is also provided between the upper split and the lower split (22).

3. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 2, characterized in that: The sealing structure includes a groove on the surface of the lower split (22), a sealing ring (23) installed in the groove, an upper split shell that presses the sealing ring (23) and inserts into the groove, and a locking member that fixes the upper split and the lower split.

4. The filtration device for immersion silicone oil coolant for lithium batteries as described in claim 3, characterized in that: The surface of the lower split (22) is also provided with a flow channel, which is located on the outer periphery of the sealing structure and is an annular groove that is recessed from the surface of the lower split (22) inward.

5. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 2, characterized in that: A support member is also provided between the filtrate chamber (221) of the lower part (22) and the filter plate, and the support member is located inside the filtrate chamber (221).

6. The filtration device for immersion silicone oil coolant for lithium batteries as described in claim 5, characterized in that: The support member is a boss extending inward from the lower part (22) along the periphery of the filtrate chamber (221) to provide support around the filter.

7. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 5, characterized in that: The support member is a bracket, including a disk located on the surface and legs for supporting the disk and fixed to the inner wall of the filtrate chamber (221).

8. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 5, characterized in that: A support plate (241) is also provided between the support member and the filter plate; the support plate (241) is provided with channels and bosses, and the channels and bosses are alternately distributed outward from the center position of the support plate (241).

9. The filtration device for immersion-type silicone oil coolant for lithium batteries as described in claim 1, characterized in that: The filtration device is used to recover filtered coolant in a lithium battery system.

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