A cooling box for an immersion battery pack

Abstract

This utility model discloses a cooling box for an immersion battery pack, including a box body, a box cover, and a cooling module. The box body is filled with coolant, the density of which decreases with increasing temperature within the upper and lower limits of the required operating temperature. The battery pack is immersed in the coolant, and the coolant circulates around the battery pack. The box cover is fitted onto the box body. The cooling module is located in the middle of the box body and includes a cooling coil, a partition, and a coil fixing seat. The partition isolates the cooling coil from the battery pack and forms a coolant channel. The cooling coil is installed in the vertical channel and connected to an external circulation system. The coil fixing seat fixes the cooling coil to the box body. The circulating medium in the cooling coil is subcritical carbon dioxide to improve the temperature uniformity within the cooling box and enhance the cooling effect of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology, specifically to a cooling box for an immersion battery pack. Background Technology

[0002] Currently, the mainstream lithium battery pack uses a bottom liquid cooling plate structure for heat dissipation. This traditional method only achieves heat exchange through the bottom surface, resulting in a significant temperature difference between the top and bottom of the battery cells within the pack. This uneven temperature distribution negatively impacts the stability of the battery cells, thereby shortening their lifespan. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a cooling box for an immersion battery pack, which improves the temperature uniformity within the cooling box and enhances the cooling effect of the battery pack.

[0004] This utility model provides a cooling box for an immersion battery pack, including a box body, a box cover, and a cooling module;

[0005] The housing is filled with coolant. The density of the coolant decreases as the temperature increases within the upper and lower limits of the operating temperature that needs to be cooled. The battery pack is immersed in the coolant, and the coolant circulates around the battery pack.

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

[0007] The cooling module is located in the middle of the housing. The cooling module includes a cooling coil, a partition, and a coil fixing seat. The partition is used to isolate the cooling coil from the battery pack and form a coolant channel. The cooling coil is installed in the vertical channel and is connected to an external circulation system. The coil fixing seat is used to fix the cooling coil to the housing.

[0008] The circulating medium in the cooling coil is subcritical carbon dioxide.

[0009] Preferably, the cooling coil is a three-dimensional spiral structure formed by bending a single continuous pipe, with the bent portion being inclined.

[0010] Preferably, a gap is provided between the partition and the bottom plate of the housing, and the height of the partition is lower than the height of the coolant level.

[0011] 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 the cooling coil is sealed to the housing wall.

[0012] Preferably, the coil mounting base includes a support rod and two mounting plates, which are located on both sides of the support rod and are detachably connected to the support rod. The mounting plates are provided with through holes for the cooling coil to pass through.

[0013] Preferably, the fixing plate and the support rod are connected by bolts.

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

[0015] Compared with the prior art, this utility model has the following technical effects:

[0016] The cooling module integrates cooling, airflow guidance, and heat insulation. Its integrated cooling and airflow design places the coil in the largest flow channel area in the center of the enclosure. The spiral tube walls form a natural flow-guiding grid, guiding the coolant through heat insulation plates on both sides to form a circulation process of "upper inflow → middle heat exchange → lower outflow," eliminating localized hot spots. The cooling module coil is positioned in the central area of ​​the enclosure, with heat insulation plates on both sides guiding the high-temperature coolant from the sides to flow into the cooling coil from the top. After heat exchange in the middle, it becomes low-temperature coolant and flows from the bottom of the coil to the battery pack. This cycle repeats, forming a natural and efficient cooling circulation process, providing reliable assurance for the stable operation of the battery pack.

[0017] The coil is formed by three-dimensional bending of a single continuous pipe, with no disconnected connection points, fundamentally eliminating cooling medium leakage. The CO2 inlet and outlet and the front panel of the housing use perforated sealing joints, which automatically press the sealing ring during installation, ensuring that the pipe does not break at this point and guaranteeing the sealing of the cooling module at the housing connection.

[0018] The cooling coil adopts a three-dimensional spiral upward structure, reducing the lateral width of the coil and optimizing space utilization. Battery pack clearances are typically extremely limited; traditional coils occupy a large lateral space and are prone to interference with surrounding components. The inclined bends significantly reduce the lateral width, perfectly meeting the installation requirements of narrow module gaps and avoiding wasted space. Attached Figure Description

[0019] 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:

[0020] Figure 1 This is a schematic diagram of the structure of Example 1;

[0021] Figure 2 This is a schematic diagram of the structure after the box cover is removed in Example 1;

[0022] Figure 3 This is a schematic diagram of the cooling module structure in Example 1;

[0023] Figure 4 This is a side view of the cooling mold in Example 1. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] Example 1

[0027] like Figure 1-3 As shown, a cooling box for an immersed battery pack includes a box body 1, a box cover 2, and a cooling module; the box cover 2 is closed to the box body 1; the box body 1 is filled with coolant, and the density of the coolant decreases as the temperature increases within the upper and lower limits of the operating temperature to be cooled. In this embodiment, silicone oil is used as the coolant, while in another embodiment, hydrocarbon coolant can be used. The battery pack 4 is immersed in the coolant, and the coolant circulates around the battery pack 4.

[0028] The cooling module is located in the center of the housing 1. The cooling module includes a cooling coil 31, partitions 32, and a coil mounting base 33. The cooling coil 33 is situated between two partitions 32, which separate the cooling coil 33 from the battery pack 4, forming a coolant channel. The cooling coil 31 is installed within this vertical channel. A gap of 10-20mm is provided between the partitions 32 and the bottom plate of the housing 1. The height of the partitions is lower than the coolant level, with a height difference of 10-20mm. The cooling coil 33 is connected to an external circulation system, and the coil mounting base 33 secures the cooling coil 31 to the housing 1. The circulating medium within the cooling coil 31 is subcritical carbon dioxide. Utilizing the heat absorption principle of carbon dioxide phase change, the coolant's heat is removed, and the temperature remains constant during the phase change process, fundamentally reducing the temperature difference within the battery pack and solving the problem of large temperature differences in traditional bottom heat dissipation. The cooling modules are evenly distributed in the middle area of ​​the housing 1. Multiple battery packs 4 are regularly arranged and electrically connected to form battery modules. Utilizing the spatial advantage of the maximum spacing between the battery modules, it ensures full contact between the high-temperature coolant and the cooling coils. After cooling, the coolant flows downward through the gaps in the cooling coils, effectively preventing localized heat accumulation. At the same time, a three-dimensional coil structure is adopted, and a baffle is added between the cooling coils and the battery modules to guide the heat on the battery surface to flow vertically, avoiding lateral flow and exacerbating the natural disturbance of the coolant within the housing. This further improves the fullness and efficiency of cooling, achieving uniform heat exchange throughout the entire area compared to the limitations of traditional single-surface heat dissipation.

[0029] Specifically, the coil mounting base 33 includes a support rod 331 and two mounting plates 332. The two mounting plates 332 are located on both sides of the support rod 331 and are respectively connected to the support rod 331 by bolts. The mounting plates 332 are provided with through holes for the cooling coil 33 to pass through the mounting plates 332. The mounting plates 332 provide support for the cooling coil 33 and are positioned through the through holes.

[0030] In another preferred embodiment, the cooling coil 33 is a three-dimensional spiral structure formed by bending a single continuous copper tube, with the bent portion arranged at an angle. Battery module gaps are typically extremely limited, and traditional coils occupy a large lateral space, easily causing interference with surrounding components. The three-dimensional spiral structure, through a significant reduction in lateral width, perfectly fits the installation requirements of narrow module gaps, avoiding space waste.

[0031] In another embodiment, the inlet and outlet of the cooling coil 33 are located on the housing walls at both ends of the housing 1. The cooling coil passes through the housing walls at both ends of the housing and is connected to the connector. The cooling coil is sealed to the housing wall.

[0032] In another embodiment, the inlet and outlet of the cooling coil 33 are installed on a separate plug-in panel, and then connected to the housing through the plug-in panel, making installation and removal convenient.

[0033] This utility model solution has wide applicability. When applied to scenarios other than battery boxes (such as PCS, data center systems, etc.), the cooling coil structure can be integrated into the corresponding electronic component box. The cooling circulation is achieved through the coolant filled in the box, which solves the problem of limited applicability of traditional heat dissipation methods and provides a stable, efficient and convenient heat dissipation solution for various electronic systems.

[0034] 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 cooling box for an immersion battery pack, characterized in that, Includes the enclosure, lid, and cooling module; The housing is filled with coolant. The density of the coolant decreases as the temperature increases within the upper and lower limits of the operating temperature that needs to be cooled. The battery pack is immersed in the coolant, and the coolant circulates around the battery pack. The lid of the box is closed with the box body; The cooling module is located in the middle of the housing. The cooling module includes a cooling coil, a partition, and a coil fixing seat. The partition is used to isolate the cooling coil from the battery pack and form a coolant channel. The cooling coil is installed in the vertical channel and is connected to an external circulation system. The coil fixing seat is used to fix the cooling coil to the housing. The circulating medium in the cooling coil is subcritical carbon dioxide.

2. The cooling box for an immersion battery pack according to claim 1, characterized in that, The cooling coil is a three-dimensional spiral structure formed by bending a single continuous pipe, with the bent part set at an angle.

3. The cooling box for an immersion battery pack according to claim 1, characterized in that, A gap is provided between the partition and the bottom plate of the box, and the height of the partition is lower than the height of the coolant level.

4. The cooling box for an immersion battery pack according to claim 1, characterized in that, 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. The cooling coil is sealed to the housing wall.

5. The cooling box for an immersion battery pack according to claim 1, characterized in that, The coil mounting base includes a support rod and two mounting plates. The two mounting plates are located on both sides of the support rod and are detachably connected to the support rod. The mounting plates are provided with through holes for the cooling coil to pass through.

6. The cooling box for an immersion battery pack according to claim 5, characterized in that, The fixing plate and the support rod are connected by bolts.

7. The cooling box for an immersion battery pack according to claim 1, characterized in that, The coolant is a hydrocarbon coolant or silicone oil.

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