Integrated multi-surface heat dissipation battery device

Abstract

The utility model relates to an integrated multi-surface heat dissipation battery device, which belongs to the field of lithium ion energy storage, and comprises a transversely arranged bottom cold plate, a plurality of side cold plates vertically arranged on the bottom cold plate and a module attached to the side cold plates, the bottom cold plate and the side cold plates are respectively provided with a plurality of flow channels for cooling liquid to flow, and the flow channels are communicated with the bottom cold plate and the side cold plates. Each side cold plate and the bottom cold plate are connected with a side cold plate liquid inlet and a side cold plate liquid outlet, and the side cold plate inner flow channel is communicated with the bottom cold plate inner flow channel through the side cold plate liquid inlet and the side cold plate liquid outlet. The heat dissipation mode of combining the bottom of the battery core and the side face of the battery core is adopted, so that the battery pack is uniformly dissipated, the heat dissipation area is obviously increased compared with the traditional bottom heat dissipation, and the heat dissipation efficiency is improved. Therefore, the service life of the battery pack is prolonged, and the safety of the battery pack is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of battery energy storage technology, and more specifically to an integrated multi-faceted heat dissipation battery device. Background Art

[0002] Lithium-ion battery packs are a core component of energy storage systems, with battery cells being the key material. The quality of the cells directly affects the overall consistency and reliability of the energy storage system. The performance and safety of a battery cell are closely related to its operating temperature; excessively high or low operating temperatures will lead to a decline in cell lifespan and performance. Therefore, the operating temperature of the cells should be strictly controlled within the range of 25℃ to 35℃, ensuring that the temperature difference between individual cells does not exceed 5℃, and the maximum safe temperature does not exceed 55℃.

[0003] In recent years, domestic research in the field of liquid-cooled energy storage for 1C high-power lithium-ion battery packs has focused on liquid cooling plates at the bottom and sides of the battery pack. This method works by removing heat through contact between the bottom of the battery cell and the liquid cooling plate. Liquid cooling relies on a continuously flowing cooling medium to remove heat generated inside the battery. The high thermal conductivity of the liquid medium can quickly reduce the temperature of the battery pack to a suitable range and ensure temperature uniformity within the battery pack. The inlet and outlet ports of the side cooling plates are typically connected using O-rings or quick-connect pipes; this design is widely used in the field of liquid-cooled energy storage for high-power lithium-ion battery packs. Currently, in the industry, pipe fittings are commonly used inside the battery pack of 1C high-power cell side-cooled energy storage systems to connect the cooling plates.

[0004] However, this design has some shortcomings and defects: heat dissipation through a liquid cooling plate with a certain contact area at the bottom of the battery pack is difficult to effectively remove the heat generated by the battery pack under high power, resulting in low cooling effect, insufficient heat dissipation efficiency, and uneven temperature distribution, which affects the life of the battery cells; the use of pipe joints to connect the cold plates inside the battery pack poses a risk of aging and leakage. Once the coolant leaks, the battery pack is at risk of short circuit, which may lead to serious safety hazards. Utility Model Content

[0005] The purpose of this invention is to provide a high-power heat dissipation solution for battery packs, so as to improve the heat dissipation efficiency of battery packs, extend their service life, and enhance safety.

[0006] To achieve the above objectives, the present invention provides an integrated multi-faceted heat dissipation battery device, comprising a horizontally arranged bottom cold plate, multiple vertically arranged side cold plates on the bottom cold plate, and a module attached to the side cold plates. Both the bottom cold plate and the side cold plates are provided with multiple channels for flowing coolant. Each side cold plate is connected to the bottom cold plate by a side cold plate inlet and a side cold plate outlet. The flow channels in the side cold plates are connected to the flow channels in the bottom cold plate through the side cold plate inlet and the side cold plate outlet.

[0007] Preferably, the coolant in the bottom cold plate can flow through the inlet of the side cold plate into the flow channel of the side cold plate, and then flow out from the outlet of the side cold plate to merge with the coolant in the bottom cold plate.

[0008] Preferably, the side cold plate is integrally welded to the bottom cold plate.

[0009] Preferably, the bottom cold plate has an opening for connecting the side cold plates, and is connected by a crossbeam.

[0010] Preferably, the module is bonded to the side cold plate.

[0011] Preferably, a thermal pad is provided between the module and the side cold plate.

[0012] Preferably, the bottom cold plate is provided with a bottom cold plate inlet and a bottom cold plate outlet.

[0013] Preferably, the bottom cold plate is connected to a panel via a crossbeam.

[0014] Preferably, the bottom cold plate is connected to a battery pack cover, and the flange edge of the battery pack cover is attached to and fixed to the bottom surface of the bottom cold plate.

[0015] Preferably, the module includes multiple battery cells, and a protective insulating sheet is provided between adjacent battery cells.

[0016] In summary, this utility model has the following beneficial technical effects:

[0017] Compared to traditional bottom-only heat dissipation methods, this invention combines bottom and side heat dissipation for the battery pack, resulting in more uniform heat dissipation. This significantly increases the heat dissipation area and improves efficiency compared to traditional bottom-based methods. This not only helps extend the battery pack's lifespan but also enhances its safety. The integrated bottom and side cold plates avoid failures caused by aging traditional pipe connections, ensuring the battery pack will not cause safety accidents due to coolant leakage. Furthermore, the elimination of internal pipe joints effectively reduces costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bottom cold plate and side cold plate in an integrated multi-faceted heat dissipation battery device of this utility model;

[0019] Figure 2 This is a schematic diagram of the assembly of an integrated multi-faceted heat dissipation battery device according to the present invention.

[0020] Figure 3 This is a schematic diagram showing the connection between the bottom cold plate and the side cold plate in an integrated multi-faceted heat dissipation battery device of this utility model;

[0021] Figure 4 This is an enlarged schematic diagram showing the connection between the bottom cold plate and the side cold plate in an integrated multi-faceted heat dissipation battery device of this utility model.

[0022] Reference numerals in the attached diagram: 1. Bottom cooling plate liquid inlet; 2. Side cooling plate liquid inlet 1; 3. Side cooling plate liquid outlet 1; 4. Side cooling plate liquid outlet 2; 5. Side cooling plate liquid inlet 2; 6. Bottom cooling plate liquid outlet; 7. Bottom cooling plate; 8. Side cooling plate; 9. Battery cell; 10. Module; 11. Battery pack top cover; 12. Panel; 13. Fixing limit opening; 14. Fixing limit protrusion; 15. Crossbeam; 16. Groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] This utility model patent proposes a high-power heat dissipation solution for battery packs, aiming to improve the heat dissipation efficiency of battery packs, extend their service life, and enhance safety. The solution relates to a battery device including a bottom cold plate 7, side cold plates 8, a battery pack top cover 11, a panel 12, and a module 10 composed of battery cells 9 connected in series. These components work together to achieve efficient thermal management.

[0025] The bottom cold plate 7 and the side cold plate 8 are the core components of this heat dissipation system. They are designed with multiple flow channels for coolant flow. These two cold plates are connected using an integrated welding technique, ensuring structural stability and sealing. Welded nozzles allow for smooth coolant flow between the bottom cold plate 7 and the side cold plate 8. To fix and limit the side cold plate 8, a fixing and limiting support structure is provided at the connection between the bottom of the side cold plate 8 and the bottom cold plate 7. Furthermore, the side of the side cold plate 8 is tightly bonded to the battery heat dissipation surface via a solid thermal conductive pad to achieve efficient heat conduction. The fixing and limiting support structure includes a fixing and limiting protrusion 14 located at the bottom of the side cold plate 8, and a fixing and limiting opening 13 on the bottom cold plate 7 that corresponds to and engages with the fixing and limiting protrusion 14. Additionally, two parallel crossbeams 15 are arranged on the bottom cold plate 7, and a groove 16 on the bottom of the side cold plate 8 is adapted to the shape of the crossbeams 15.

[0026] During installation, the bottom cold plate 7 and the side cold plate 8 are fixed by two crossbeams 15 and grooves 16, and are further limited and supported by the fixing limiting protrusions 14 and fixing limiting openings 13 below the side cold plate 8. This design not only improves the stability of the structure but also simplifies the assembly process. Coolant enters through the inlet of the bottom cold plate 7 and flows into the side cold plate 8 through the first and second side cold plate inlets 2 and 5. These inlets are located inside the battery pack, and the design eliminates the need for plug-in pipe joints, thereby reducing the risk of leakage.

[0027] After flowing through multiple channels of the cold plate, the coolant converges at the outlet of the bottom cold plate 7 and eventually flows out of the bottom cold plate 7. During this process, some of the coolant in the bottom cold plate 7 that passes near the side cold plate inlet 2 or the side cold plate inlet 5 flows through the channels of the side cold plate 8 and then flows out from the side cold plate outlet 3 and the side cold plate outlet 4, merging with the coolant in the bottom cold plate 7. This design allows the coolant to flow evenly across the battery pack, thereby achieving uniform heat dissipation.

[0028] Compared to traditional bottom-only heat dissipation methods, this invention combines heat dissipation from the bottom and sides of the battery cell 9, resulting in more uniform heat dissipation across the battery pack. This significantly increases the heat dissipation area and improves efficiency compared to traditional bottom-based heat dissipation. This not only helps extend the battery pack's lifespan but also enhances its safety. The integrated bottom cold plate 7 and side cold plate 8 avoid failure issues caused by aging traditional pipe connections, ensuring that the battery pack will not cause safety accidents due to coolant leakage. Furthermore, the elimination of internal pipe joints in the battery pack effectively reduces costs.

[0029] The heat dissipation system of this invention places particular emphasis on the flow efficiency of the coolant to ensure effective cooling of the battery pack. To this end, the system is designed with a unique fluid inlet and outlet mechanism, allowing the coolant to enter the side cooling plates 8 simultaneously in parallel. This parallel entry design means that the coolant can flow through all the side cooling plates 8 of the battery pack almost simultaneously, thereby achieving faster and more uniform heat exchange.

[0030] Because the flow resistance of the coolant inside the cold plate is optimized to be minimized, this not only reduces energy loss but also improves cooling efficiency. Lower flow resistance means the coolant can flow more smoothly through the cold plate, thus more effectively absorbing and carrying away the heat generated by the battery. This efficient heat exchange process is crucial for maintaining the battery pack within its optimal operating temperature range, especially under high power output or fast charging conditions.

[0031] Furthermore, this parallel flow design helps reduce pressure loss in the cooling system, thereby reducing the energy required to pump the coolant and further improving the overall system's energy efficiency. In practical applications, this means the battery pack can achieve better heat dissipation performance with lower energy consumption, which is significant for improving the driving range and battery life of electric vehicles.

[0032] In the assembly of the battery module 10, protective separators are provided between adjacent cells 9. The cells 9 are stacked sequentially and squeezed by the end plates at both ends, and then bound together with steel cable ties to form a long module 10. This module 10 is hoisted above the bottom cold plate 7 using tooling with end plates at both ends, ensuring that the contact surface between the module 10 and the side cold plate 8 is in close contact with the thermal pad to achieve heat dissipation. Subsequently, the panel 12 is fixedly installed to the crossbeam 15 of the bottom cold plate 7 with screws, and finally the flange edge of the battery pack cover 11 is attached to the bottom surface of the cold plate and fixed with screws.

[0033] It is worth noting that the connection between the side cold plate 8 and the bottom cold plate 7 is not limited to welding; other methods such as screws and clips can also be used to form an integrated heat dissipation device. This flexibility provides more options for different application scenarios and manufacturing requirements.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated multi-faceted heat dissipation battery device, characterized in that, It includes a horizontally arranged bottom cold plate (7), multiple vertically arranged side cold plates (8) on the bottom cold plate (7), and a module (10) attached to the side cold plates (8). The bottom cold plate (7) and the side cold plates (8) are provided with multiple flow channels for flowing coolant. Each side cold plate (8) is connected to the bottom cold plate (7) with a side cold plate inlet and a side cold plate outlet. The flow channels in the side cold plate (8) are connected to the flow channels in the bottom cold plate (7) through the side cold plate inlet and the side cold plate outlet.

2. The integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The coolant in the bottom cold plate (7) can flow through the inlet of the side cold plate into the flow channel of the side cold plate (8), and then flow out from the outlet of the side cold plate to merge with the coolant in the bottom cold plate (7).

3. An integrated multi-faceted heat dissipation battery device according to claim 1 or 2, characterized in that, The side cold plate (8) is integrally welded to the bottom cold plate (7).

4. The integrated multi-faceted heat dissipation battery device according to claim 3, characterized in that, The bottom cold plate (7) is provided with an opening for connecting the side cold plate (8) and is connected by a crossbeam (15).

5. The integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The module (10) is bonded to the side cold plate (8).

6. The integrated multi-faceted heat dissipation battery device according to claim 5, characterized in that, A heat-conducting pad is provided between the module (10) and the side cold plate (8).

7. The integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The bottom cold plate (7) is provided with a bottom cold plate inlet (1) and a bottom cold plate outlet (6).

8. The integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The bottom cold plate (7) is connected to the panel (12) via a crossbeam (15).

9. An integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The bottom cold plate (7) is connected to the battery pack cover (11), and the flange edge of the battery pack cover (11) is attached to and fixed to the bottom surface of the bottom cold plate (7).

10. An integrated multi-faceted heat dissipation battery device according to claim 1, characterized in that, The module (10) includes multiple battery cells (9), and a protective isolation sheet is provided between adjacent battery cells (9).

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