An immersion battery cooling box

Abstract

This utility model discloses an immersion battery cooling box, the box being filled with coolant, in which several battery packs are immersed, and the coolant circulates around the battery packs; each battery pack consists of several batteries arranged together, and cooling coils are provided between adjacent battery packs and between the battery packs on both sides and the side walls of the box, the circulating medium in the cooling coils being subcritical carbon dioxide; the battery packs are fixed to the bottom plate of the box by mounting brackets, the mounting brackets including longitudinal positioning mechanisms and transverse positioning mechanisms to improve the temperature uniformity inside the cooling box, enhance the cooling effect of the battery packs, and improve the stability of the batteries and cooling coils during transportation bumps or impacts.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology, specifically to an immersion battery cooling box. 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 an immersion battery cooling box to improve the temperature uniformity within the cooling box and enhance the cooling effect of the battery pack.

[0004] This utility model provides an immersion battery cooling box, the box being filled with coolant, with several battery packs immersed in the coolant, the coolant circulating around the battery packs; each battery pack consists of several batteries arranged together, and cooling coils are provided between adjacent battery packs and between the battery packs on both sides and the side walls of the box, the circulating medium in the cooling coils being subcritical carbon dioxide; the battery packs are fixed to the bottom plate of the box by a mounting bracket, the mounting bracket including a longitudinal positioning mechanism and a transverse positioning mechanism.

[0005] Preferably, the mounting bracket further includes end plates and fastening straps. The end plates are installed at both ends of the battery pack and are fixedly connected to the bottom plate of the casing. The longitudinal positioning mechanism is installed on both sides of the battery pack and has bending portions at the top and bottom surfaces of each battery. The transverse positioning mechanism is bound around the battery pack.

[0006] Preferably, the longitudinal positioning mechanism is a plastic positioning component, and the transverse positioning mechanism is a fastening steel strip.

[0007] Preferably, the plastic positioning component is provided with a groove, and the fastening steel strips on both sides of the battery pack are engaged in the groove.

[0008] Preferably, four battery packs are arranged side by side inside the housing, and the cooling coils are configured with five or three channels, with the battery packs located between two cooling coils.

[0009] Preferably, the carbon dioxide inlet and outlet of the cooling coil are located on both sides of the housing.

[0010] Preferably, the cooling coil is fixed to the bottom plate of the housing by a fixing seat.

[0011] Preferably, the cooling coil is formed by three-dimensional bending of a single continuous pipe.

[0012] 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.

[0013] Preferably, the coolant is a hydrocarbon coolant or silicone oil.

[0014] Compared with the prior art, this utility model has the following technical effects:

[0015] During transportation, the coil fixing components of the immersion battery cooling box effectively absorb vibration energy, reducing lateral displacement caused by external impacts or internal liquid flow. The battery pack is designed with longitudinal positioning components, which are assembled with the battery pack via lateral positioning components. When the battery box vibrates vertically, the longitudinal positioning components distribute the force of the battery module's vertical vibration to the lateral positioning components, preventing the batteries from detaching due to vibration. Simultaneously, the longitudinal positioning components prevent the cooling coils from directly contacting the battery surface, improving the overall insulation effect.

[0016] The carbon dioxide inlet and outlet of the cooling coil are located on both sides of the enclosure, avoiding the area where the positive and negative terminals of the front battery module are connected, thus preventing the risk of electrical conduction from contact between the coil and the terminals. In the event of a collision or impact during transport or use, this side-mounted structure effectively prevents direct contact between the positive and negative copper busbars on the enclosure end plate and the cooling coil. This design not only ensures the system's airtightness but, more importantly, fundamentally prevents potential leakage accidents caused by metal-to-metal contact, significantly improving the overall safety and reliability of the system. Attached Figure Description

[0017] 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:

[0018] Figure 1 This is a schematic diagram of the structure of Example 1;

[0019] Figure 2 This is a schematic diagram of the structure after the box body of Example 1 has been removed;

[0020] Figure 3 This is a schematic diagram of the cooling coil structure in Example 1;

[0021] Figure 4 This is a schematic diagram of the battery pack structure in Example 1;

[0022] Figure 5This is a schematic diagram of the plastic positioning component structure in Example 1;

[0023] Figure 6 This is a schematic diagram of a 3-channel cooling coil structure. 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 1-4 As shown, an immersion battery cooling box includes a box body 1 and a box cover (not shown). The box body is filled with coolant, which can be a hydrocarbon coolant or silicone oil. Battery packs 2 are immersed in the coolant and fixed to the bottom plate of the box body 1 by mounting brackets 6. Four battery packs 2 are arranged horizontally side by side inside the box body, and two battery packs 2 are joined together vertically to form a row. Each battery pack 2 consists of several batteries 21 arranged together; in this embodiment, 13 batteries 21 are arranged together. Cooling coils 3 are provided between adjacent battery packs 2 and between the battery packs on both sides and the side walls of the box body. The cooling coils 3 are fixed to the bottom plate of the box body 1 by fasteners 31. This embodiment has 5 cooling coils (3 can also be used in another embodiment), and the 5 cooling coils are formed by three-dimensional bending of a single continuous pipe. The inlet and outlet of the cooling coils 3 are located on the box body walls at both ends of the box body. The cooling coils 3 pass through the box body walls at both ends of the box body and are connected to connectors, and the cooling coils are sealed to the box body walls. The inlet and outlet of the cooling coil 3 are located on both sides of the box wall at both ends of the box.

[0028] Specifically, the mounting bracket 22 includes end plates 23, plastic positioning parts 24, and fastening steel straps 25. The end plates 23 are installed at both ends of the battery pack 2. Connecting rods (or connecting pipes) are welded to the housing 1, and the end plates 23 are fixed to the connecting rods with bolts. The plastic positioning parts 24 are installed on both sides of the battery pack, and each battery has a bend 241 on its top and bottom surfaces. The bend on the top surface serves to hold the battery in place and prevent it from shifting upwards, while the bend on the bottom surface serves to elevate the battery, creating a gap between it and the bottom surface, which serves both as insulation and allows for coolant flow. The fastening steel straps 25 are wrapped around the battery pack 2. The plastic positioning parts 24 have grooves, into which the fastening steel straps 25 can engage.

[0029] Cooling coil 3 is interspersed within the gaps of battery pack 2. As the internal coolant temperature rises, it naturally flows upwards, passing through cooling coil 3 and forming a micro-circulation heat exchange process around its exterior. Utilizing the CO2 phase change endothermic principle, the temperature of the CO2 flowing inside cooling coil 3 remains consistent, thus ensuring a constant temperature of the coolant immersed throughout the entire housing 1. Simultaneously, the multi-layered folded layout of cooling coil 3 increases the external heat exchange area, improving heat exchange efficiency and ensuring uniform heat dissipation even under dense battery pack conditions, providing reliable support for the stable operation of the battery cells.

[0030] The fastener 31 is made of high-strength, corrosion-resistant material. The fastener 31 and the bottom plate of the housing 1 can be designed for detachable connection, ensuring both stability and ease of disassembly and maintenance. During battery pack transportation, the fastener 31 effectively absorbs vibration energy, reducing lateral displacement of the cooling coils caused by external impacts or internal liquid flow. The plastic positioning component designed on the battery pack is assembled with the battery pack fastening steel strap. When the lithium battery box vibrates vertically, the plastic positioning component can distribute the force of the vertical vibration of the battery module onto the fastening steel strap, preventing the battery from detaching due to vibration. Simultaneously, the plastic positioning component prevents the cooling coils from directly contacting the battery surface, improving the overall insulation effect.

[0031] The inlet and outlet of the cooling coil 3 are located on both sides of the casing wall at both ends of the casing. When the battery casing is accidentally collided or subjected to external impact during transportation or use, this side-mounted structure can effectively prevent direct contact between the positive and negative copper busbars on the casing end plate and the cooling coil. This design not only ensures the system's sealing performance, but more importantly, it can fundamentally prevent leakage accidents that may be caused by metal-to-metal contact, greatly improving the safety and reliability of the entire system.

[0032] 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. An immersion battery cooling box, characterized in that, The enclosure is filled with coolant, and several battery packs are immersed in the coolant, which circulates around the battery packs. Each battery pack consists of several batteries arranged together. Cooling coils are installed between adjacent battery packs and between the battery packs on both sides and the side walls of the enclosure. The circulating medium in the cooling coils is subcritical carbon dioxide. The battery packs are fixed to the bottom plate of the enclosure by a mounting bracket, which includes a longitudinal positioning mechanism and a transverse positioning mechanism.

2. The immersion battery cooling box according to claim 1, characterized in that, The mounting frame also includes end plates and fastening straps. The end plates are installed at both ends of the battery pack and are fixedly connected to the bottom plate of the casing. The longitudinal positioning mechanism is installed on both sides of the battery pack and has bending parts at the top and bottom surfaces of each battery. The transverse positioning mechanism is tied around the battery pack.

3. The immersion battery cooling box according to claim 2, characterized in that, The longitudinal positioning mechanism is a plastic positioning component, and the transverse positioning mechanism is a fastening steel strip.

4. The immersion battery cooling box according to claim 3, characterized in that, The plastic positioning component has a groove, and the fastening steel straps on both sides of the battery pack are engaged in the groove.

5. The immersion battery cooling box according to claim 1, characterized in that, The housing contains four battery packs arranged side by side, and the cooling coils have either five or three channels. The battery packs are located between two cooling coils.

6. The immersion battery cooling box according to claim 1, characterized in that, The carbon dioxide inlet and outlet of the cooling coil are located on both sides of the housing.

7. The immersion battery cooling box according to claim 1, characterized in that, The cooling coil is fixed to the bottom plate of the housing by a mounting bracket.

8. The immersion battery cooling box according to claim 1, characterized in that, The cooling coil is formed by bending a single continuous pipe in three dimensions.

9. The immersion battery cooling box 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.

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

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