An immersion enclosure for CO2 coil cooling

Abstract

This utility model discloses an immersion-type chamber for CO2 coil cooling, including a chamber body, a cover, and a cooling coil. The chamber body is filled with coolant, the density of which decreases as the temperature increases within the upper and lower limits of the operating temperature to be cooled. The parts to be cooled are immersed in the coolant. A vertical channel is provided inside the chamber body. The cover is fitted onto the chamber body. The cooling coil is installed inside the vertical channel and is connected to an external circulation system. The circulating medium in the cooling coil is subcritical carbon dioxide, achieving a simple structure, convenient installation, and high cooling efficiency by reducing the temperature difference inside the chamber through CO2 phase change heat absorption.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology, specifically to an immersion-type enclosure for CO2 coil cooling. Background Technology

[0002] Currently, the most common way to dissipate heat from electronic system components (such as battery packs, PCS, and data center systems in lithium-ion energy storage power stations) is to use a bottom liquid cooling plate structure. This only dissipates heat at the bottom, resulting in a large temperature difference between the top and bottom of the electrical components inside the enclosure, which affects their service life. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an immersion chamber for CO2 coil cooling, which has a simple structure, convenient installation, reduces the temperature difference inside the chamber by absorbing heat through CO2 phase change, and has high cooling efficiency.

[0004] This utility model provides an immersion-type enclosure for CO2 coil cooling, including an enclosure, an enclosure cover, and a cooling coil;

[0005] The chamber is filled with coolant. The density of the coolant decreases as the temperature increases within the upper and lower limits of the working temperature to be cooled. The parts to be cooled are immersed in the coolant, and the coolant circulates around the parts. The chamber is provided with vertical channels.

[0006] The lid of the box is closed with the box body;

[0007] The cooling coil is installed in a vertical channel and is connected to an external circulation system. The circulating medium in the cooling coil is subcritical carbon dioxide.

[0008] Preferably, the inlet and outlet of the cooling coil are located on the walls of the housing at both ends of the housing, the cooling coil passes through the walls of the housing at both ends of the housing and is connected to the connector, and a sealing structure is provided between the cooling coil and the housing wall.

[0009] Preferably, the cooling coils are located on both sides of the housing.

[0010] Preferably, the distance between the cooling coil and the side wall of the housing is greater than the distance between the cooling coil and the partition.

[0011] Preferably, the cooling coil is located in the middle of the housing.

[0012] Preferably, the cooling coils are located on both sides and in the middle of the housing.

[0013] Preferably, a partition is provided between the cooling coil and the component to be cooled, the partition forms a vertical channel with the side wall of the housing, the bottom of the partition is higher than the bottom surface of the housing so that the vertical channel is connected to the space where the component to be cooled is located at the bottom, and the liquid level of the coolant is higher than the top of the partition.

[0014] Preferably, the coolant is a hydrocarbon coolant or silicone oil.

[0015] Preferably, the side wall of the housing is provided with a hook, and the cooling coil is hung on the hook.

[0016] Preferably, the component to be cooled is a lithium-ion battery pack, a lithium-ion battery storage system PCS, or a data center system.

[0017] Compared with the prior art, this utility model has the following technical effects:

[0018] 1. It adopts a coil-type cooling structure, with the coils only arranged on both sides of the cabinet. The inlet and outlet are connected to the front of the cabinet, making installation inside the cabinet simple and convenient. The installation and removal of the coils will not affect other components inside the cabinet. The coils are connected to the side walls of the cabinet using a hook-like connection. The CO2 inlet and outlet are located at the front of the cabinet. The installation and removal of the coils will not affect other components. The structure is simple and the installation is convenient.

[0019] 2. The cooling medium inside the coil is CO2, which utilizes phase change cooling to improve cooling efficiency. The medium circulating inside the coil is subcritical liquid CO2. Utilizing the principle of CO2 phase change endothermic absorption, it removes heat from the cooling liquid inside the tank. Simultaneously, during the CO2 phase change process, the inlet and outlet CO2 temperatures can be maintained within 1°C, reducing the temperature difference of the submerged coolant inside the tank and further improving cooling efficiency.

[0020] 3. The cooling coils are placed in the gaps on both sides of the enclosure, allowing the submerged coolant to naturally flow through a temperature gradient, resulting in more thorough and efficient cooling. When the components inside the enclosure heat up, the submerged coolant naturally flows upwards after its temperature rises, cools them, and then naturally flows downwards, returning from the bottom channel to the top, forming a natural circulation process. The submerged coolant can cool thoroughly and efficiently, preventing localized heat buildup in the components.

[0021] 4. The immersion coolant uses hydrocarbon coolant, silicone oil and other materials with high flash point, large specific heat capacity and high thermal conductivity, which can not only meet the cooling requirements, but also avoid the safety problems caused by thermal runaway of lithium battery.

[0022] 5. Add baffles between the coils on both sides and the parts to be cooled, so that the heat in this area naturally flows up and down, avoiding lateral flow and exacerbating the natural turbulence of the coolant inside the entire housing, thus making the cooling more complete. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the structure of Example 1;

[0025] Figure 2 This is a schematic diagram of the structure after the box cover of Example 1 has been removed;

[0026] Figure 3 This is a cross-sectional view of Example 1;

[0027] Figure 4 This is a schematic diagram of the structure after the box cover is removed in Example 2;

[0028] Figure 5 This is a schematic diagram of the structure after the box cover is removed in Example 3;

[0029] Figure 6 This is a schematic diagram of the structure after the box cover is removed in Example 4;

[0030] 1. Box body, 2. Box cover, 21. Hook, 22. Partition, 3. Cooling coil, 31. Inlet / outlet connector, 4. Battery module, 5. Electronic function plug-in. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0033] Example 1

[0034] like Figure 1-3As shown, taking a battery as an example, an immersion enclosure for CO2 coil cooling includes an enclosure 1, an enclosure cover 2, a cooling coil 3, inlet and outlet connectors 31 of the cooling coil 3, a battery module 4, and electronic functional plug-in 5.

[0035] The enclosure 1 and the cover 2 are connected by bolts and sealed at the contact surface. The cover 2 is equipped with a coolant inlet 21 and an explosion-proof valve 22.

[0036] The cooling coil 3 is formed by coiling a single tube and is assembled with the housing 1. Inlet and outlet connectors 31 are located at the front of the housing 1, and hooks 21 are installed on the housing 1 for securing the cooling coil 3. The inlet and outlet connectors 31 are fixed to the housing 1 and sealed at the perforations. The housing 1 is filled with coolant, which dissipates heat from the battery module 4, reaching above the top of the cooling coil 3. The coolant inside the housing 1 is used to dissipate heat from the battery module 4. The circulating medium in the cooling coil 3 is subcritical liquid CO2. Utilizing the CO2 phase change endothermic principle, the internal coolant is cooled. Simultaneously, the temperature remains relatively constant during the CO2 phase change, allowing the coolant inside the housing 1 to dissipate heat effectively. The inlet and outlet CO2 temperatures can be maintained within 1°C, reducing the temperature difference of the coolant inside the housing, improving cooling efficiency, and ensuring minimal temperature difference in the battery module.

[0037] The coolant used for immersion is a hydrocarbon coolant or silicone oil, which has the characteristics of high flash point, large specific heat capacity and high thermal conductivity. It can meet the cooling requirements and avoid the safety problems caused by thermal runaway of lithium battery.

[0038] Cooling coils 3 are evenly distributed on both sides of the housing 1 to ensure full contact between the high-temperature coolant and the coils 3. Simultaneously, as the coolant temperature decreases, it flows downwards through the gaps, preventing localized heat buildup in the coolant submerged within the housing 1. The distance between the battery modules on both sides inside the housing is greater than the distance between the modules themselves, ensuring maximum fluid flow in this area. Furthermore, the distance between the coils and the battery modules is less than the distance from the side walls of the housing, further enhancing the flow of coolant in this area.

[0039] Cooling coil 3 is positioned in the side gaps within the enclosure, with a greater spacing on both sides than in other areas. This maximizes the flow of coolant throughout the enclosure, ensuring all internal coolant heat exchange occurs at this location. When the battery modules inside the enclosure heat up, the submerged coolant naturally flows upwards after cooling, then flows downwards again, returning to the top through the bottom channel, creating a natural circulation process. This efficient cooling prevents localized heat buildup within the battery modules, extending their lifespan.

[0040] The technical solution described in this utility model is applicable to the exterior of the battery box, and the cooling structure can also be applied to applications where electronic components in lithium-ion energy storage systems (PACKs), PCS, and data center systems generate heat slowly and require minimal temperature differences.

[0041] Example 2

[0042] like Figure 4 As shown, a partition 22 is provided between the two side coils 2 and the component to be cooled, and the rest is the same as in Embodiment 1. This allows the heat on the surface of the battery to naturally flow up and down, avoiding left and right flow and aggravating the natural disturbance of the coolant inside the entire box, thus making the cooling more thorough.

[0043] Example 3

[0044] like Figure 5 As shown, the cooling coils 3 are arranged on both sides and in the middle of the cabinet. The arrangement of three cooling coils on both sides and in the middle makes the cooling inside the cabinet more efficient.

[0045] Example 4

[0046] like Figure 6 As shown, the cooling coil 3 is located in the middle of the housing 1, and a partition 22 is provided between the cooling coil 3 and the battery. The rest is the same as in Embodiment 1. The cooling coil 3 is arranged in the middle area of ​​the housing 1, where the battery has a relatively large gap, maximizing the flow of coolant throughout the housing. All the internal coolant undergoes heat exchange in this area. When the battery inside the housing heats up, the internally immersed coolant naturally flows upwards after its temperature rises, and after cooling, it naturally flows downwards, returning from the bottom channel to the top, forming a natural circulation process. The internally immersed coolant can cool sufficiently and efficiently, preventing localized heat accumulation in the internal battery modules and improving battery life.

[0047] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A CO2 coil cooled immersion cabinet characterized by, Includes the enclosure, cover, and cooling coils; The chamber is filled with coolant. The density of the coolant decreases as the temperature increases within the upper and lower limits of the working temperature to be cooled. The parts to be cooled are immersed in the coolant, and the coolant circulates around the parts. The chamber is provided with vertical channels. The lid of the box is closed with the box body; The cooling coil is installed in a vertical channel and is connected to an external circulation system. The circulating medium in the cooling coil is subcritical carbon dioxide.

2. A CO2 coil cooled immersion cabinet according to claim 1, wherein, The inlet and outlet of the cooling coil are located on the walls of the housing at both ends of the housing. The cooling coil passes through the walls of the housing at both ends of the housing and is connected to the connector. A sealing structure is provided between the cooling coil and the housing wall.

3. A CO2 coil cooled immersion cabinet according to claim 2, wherein, The cooling coils are located on both sides of the housing.

4. The CO2 coil cooled immersion cabinet of claim 3, wherein, The distance between the cooling coil and the side wall of the housing is greater than the distance between the cooling coil and the partition.

5. The CO2 coil cooled immersion cabinet of claim 2, wherein, The cooling coil is located in the middle of the housing.

6. A CO2 coil cooled immersion cabinet according to claim 2, wherein, The cooling coils are located on both sides and in the middle of the housing.

7. The CO2 coil cooled immersion cabinet of any of claims 3-6, wherein, A partition is provided between the cooling coil and the component to be cooled. The partition forms a vertical channel with the side wall of the housing. The bottom of the partition is higher than the bottom surface of the housing, so that the vertical channel is connected to the space where the component to be cooled is located at the bottom. The liquid level of the coolant is higher than the top of the partition.

8. The CO2 coil cooled immersion cabinet of claim 1, wherein, The coolant is a hydrocarbon coolant or silicone oil.

9. A CO2 coil cooled immersion cabinet according to claim 1, wherein, The side wall of the housing is provided with hooks, and the cooling coil is hung on the hooks.

10. The CO2 coil cooled immersion cabinet of claim 1, wherein, The component to be cooled is a lithium-ion battery pack, a lithium-ion battery storage system PCS, or a data center system.

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