A double-inlet split-flow corrugated channel lithium battery immersion cooling system

Abstract

The utility model relates to lithium battery heat management technical field, concretely relates to a kind of double-entry shunt type corrugated channel lithium battery immersion cooling system, including the battery shell for setting battery pack;The battery shell includes the shell of one end opening and cover body;The front side wall and rear side wall of the shell are respectively provided with inlet and outlet;Flow baffle is provided in the shell along the horizontal direction, and the center point of the flow baffle, inlet and outlet is on the same height;Several mounting holes for installing each battery in battery pack are formed in the flow baffle;Flow baffle is also provided with turbulence baffle perpendicular to the horizontal direction of flow baffle.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery thermal management technology, specifically to a dual-inlet shunt corrugated channel lithium battery immersion cooling system. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, lithium batteries have become the core energy carrier in fields such as electric vehicles and energy storage power stations due to their advantages such as high energy density and long cycle life. However, lithium batteries continuously generate heat during charging and discharging, especially in high-rate charging and discharging or densely arranged battery packs, where heat can easily accumulate and cause the battery temperature to rise rapidly.

[0003] When battery temperature exceeds its optimal operating temperature range, it not only significantly reduces the battery's charge / discharge efficiency and cycle life but may also trigger thermal runaway, seriously threatening the safe and stable operation of equipment. Therefore, an efficient and uniform heat dissipation and cooling system is one of the key technologies for ensuring the performance and safety of lithium batteries. As electric vehicles and energy storage systems continuously increase their demands for battery pack capacity and power density, higher requirements are being placed on battery pack thermal management. Immersion cooling, with its advantages of direct contact with the coolant, compact structure, and good temperature uniformity, is gaining increasing attention.

[0004] However, existing immersion cooling systems suffer from the following technical challenges: Firstly, some systems have poorly designed flow channels, resulting in uneven coolant distribution within the casing and significant temperature differences across different areas of the battery pack, impacting overall performance. Secondly, the pursuit of a compact structure leads to a small distance between the battery pack and the casing, which can increase coolant flow resistance, weaken the eddy current effect, and limit heat transfer efficiency. Furthermore, traditional single-inlet or non-splitting flow channel designs are prone to "short-circuiting" of the coolant during flow, meaning that some areas experience excessive coolant flow while the core heat-generating areas receive insufficient flow, further exacerbating the uneven temperature distribution.

[0005] Therefore, there is an urgent need for a dual-inlet shunt corrugated channel lithium battery immersion cooling system, which can achieve multi-stage turbulence and uniform distribution of coolant in the shell while maintaining the compact structure of the battery pack and the shell, thereby further improving the overall heat transfer efficiency and temperature uniformity. Utility Model Content

[0006] The technical problem solved by this utility model is to provide a dual-inlet shunt corrugated channel lithium battery immersion cooling system, which achieves multi-stage turbulence and uniform distribution of coolant in the shell while maintaining the compact structure of the battery pack and the shell, thereby further improving the overall heat transfer efficiency and temperature uniformity.

[0007] The basic solution provided by this utility model is: a dual-inlet shunt corrugated channel lithium battery immersion cooling system, including a battery casing for mounting the battery pack; the battery casing includes a shell with one end open and a cover; The front and rear side walls of the housing are respectively provided with an inlet and an outlet; A flow divider baffle is provided horizontally inside the housing. The center point of the flow divider baffle, the inlet, and the outlet are at the same height. The flow divider baffle has several mounting holes for installing each battery in the battery pack. The flow divider baffle is also provided with a turbulence baffle perpendicular to the horizontal direction of the flow divider baffle.

[0008] The principle and advantages of this utility model are as follows: The cooling system is based on the design concept of immersion liquid cooling + flow diversion and turbulence enhancement heat transfer. The specific principle is as follows: After the cooling medium (such as insulating coolant) enters from the inlet on the front side wall of the shell, it is divided into two parts under the action of the horizontally set flow diversion baffle. One part flows along the top of the flow diversion baffle, and the other part flows along the bottom of the flow diversion baffle, so as to achieve "top and bottom encircling" coverage of the battery pack.

[0009] Each battery in the battery pack is fixed by mounting holes on the shunt baffle, so that the battery body is completely immersed in the cooling medium. Through direct contact between the medium and the battery surface, the heat generated by the battery during operation is quickly absorbed.

[0010] The vertical turbulence baffles installed on the flow divider will interfere with the flow state of the cooling medium, break the "laminar boundary layer" that may exist, and make the medium form turbulent or complex flow field, thereby enhancing the heat exchange efficiency between the medium and the battery surface.

[0011] After absorbing heat, the high-temperature cooling medium eventually flows out from the outlet on the rear side wall of the shell, completing the heat dissipation cycle.

[0012] In this design, the dual-inlet diversion design ensures that the cooling medium evenly covers the upper and lower sides of the battery pack, avoiding local heat dissipation blind spots; the turbulence baffle enhances the heat transfer coefficient between the medium and the battery surface by strengthening fluid disturbance, and the heat exchange efficiency can be significantly improved compared with ordinary straight channel structure.

[0013] The shunt baffle is at the same height as the center point of the inlet and outlet, ensuring a more balanced pressure distribution of the cooling medium during flow and reducing temperature differences at different locations in the battery pack. The immersion contact method avoids the problem of localized overheating caused by "poor contact" in air cooling, resulting in better overall temperature consistency of the battery pack.

[0014] The flow divider serves the dual functions of "battery fixation" and "fluid diversion," simplifying the internal structure of the system and eliminating the need for additional complex flow guiding components. The rational flow diversion and turbulence design reduces fluid flow resistance, and compared to traditional complex flow divider structures, it reduces the pump power consumption required for cooling medium circulation, thus lowering system operating energy consumption. In other words, while maintaining a compact structure between the battery pack and the casing, it achieves multi-stage turbulence and uniform distribution of coolant within the casing, further improving overall heat transfer efficiency and temperature uniformity.

[0015] Furthermore, the left and right inner walls of the housing are periodic corrugated channel structures.

[0016] Beneficial effects: The periodic corrugated structure forces the cooling medium to continuously change direction and velocity during flow, forming a periodic contraction and expansion flow field. This dynamic change can further break the laminar boundary layer formed by the fluid on the battery surface, promote turbulence generation, increase the contact frequency and contact area between the cooling medium and the battery side surface and casing wall, thereby enhancing heat exchange and significantly improving the overall heat dissipation capacity.

[0017] Compared to flat sidewalls, corrugated channels extend the flow path of the cooling medium within the casing. This allows the cooling medium more time to exchange heat with the battery pack, enabling it to more fully absorb the heat generated by the battery, reducing the amount of insufficiently absorbed cooling medium flowing out directly, and improving the utilization rate of the cooling medium.

[0018] The corrugated sidewalls work synergistically with the flow divider and the turbulence baffle: the flow divider enables vertical flow separation, the turbulence baffle enhances local disturbance, and the corrugated sidewalls optimize the fluid motion state from the perspective of the overall flow field. The combination of the three enables the cooling medium to form an all-round, multi-dimensional, and highly efficient heat dissipation flow field within the shell, which greatly improves the overall cooling performance of the system.

[0019] Furthermore, the wavelength corresponding to the periodic corrugated channel structure is The peak is .

[0020] Furthermore, the spacing between the individual cells in the battery pack is... The distance between the battery near each side wall of the casing and the corresponding side wall is... .

[0021] Furthermore, the turbulence baffles are respectively disposed on the upper and lower end faces of the diversion baffle.

[0022] Beneficial effects: The flow divider separates the interior of the casing into upper and lower flow channels, while the baffles on both the upper and lower end faces can disturb the cooling medium in each channel. This design breaks down the laminar boundary layer that may exist in the upper and lower flow channels, allowing the cooling medium in both channels to be in a more active flow state. This ensures that the upper and lower surfaces of the battery pack can fully contact the cooling medium for heat exchange, avoiding local heat exchange efficiency differences caused by insufficient turbulence on one side, thereby improving the overall heat dissipation capacity of the system.

[0023] The turbulence baffles are directly mounted on the upper and lower end faces of the shunt baffles, eliminating the need for additional installation space within the housing and thus not increasing the overall system volume. This integrated design enhances the turbulence effect while maintaining structural compactness, making it particularly suitable for scenarios where lithium battery packs have high space utilization requirements (such as electric vehicles and energy storage devices).

[0024] Furthermore, multiple baffles are provided.

[0025] Beneficial effects: Multiple baffles can create multi-point, multi-regional disturbance effects on the upper and lower end faces of the flow divider. During flow, the cooling medium will sequentially contact multiple baffles, continuously experiencing obstruction, diversion, and guidance, forming continuous and dense flow field disturbances. This high-frequency disturbance can more thoroughly break the laminar boundary layer, preventing heat accumulation in localized areas due to insufficient disturbance, and ensuring more complete and uniform heat exchange between the cooling medium and the battery surface.

[0026] The local disturbances created by multiple baffles complement the overall flow field disturbances generated by the periodic corrugated channels on the shell sidewalls: the corrugated channels guide the fluid to form complex paths on a macroscopic level, while the multiple baffles cut and divert the fluid on a microscopic level. The combination of the two creates a "macroscopically ordered, microscopically violent" flow state for the cooling medium within the shell, maximizing the heat exchange area and heat exchange efficiency.

[0027] Furthermore, the height of the baffle is . Attached Figure Description

[0028] Figure 1 This is a partial structural schematic diagram of the dual-inlet shunt corrugated channel lithium battery immersion cooling system in Embodiment 1 of this utility model.

[0029] Figure 2 This is a schematic diagram of a portion of the dual-inlet shunt corrugated channel lithium battery immersion cooling system in Embodiment 1 of this utility model. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method: The markings in the accompanying drawings include: front sidewall 1, left inner sidewall 2, rear sidewall 3, right inner sidewall 4, inlet 5, outlet 6, busbar 7, tab 8, battery 9, shunt baffle 10, turbulence baffle 11, and mounting hole 12.

[0031] The basic implementation examples are as follows: Figure 1 and Figure 2 The diagram illustrates a dual-inlet shunt-type corrugated channel lithium battery immersion cooling system, comprising a battery casing for housing nine battery groups; the battery casing includes a shell with an opening at one end and a cover; in this embodiment, the nine battery groups are composed of 18650 lithium batteries connected in a 4×5 arrangement, divided into five rows of batteries 9 along the flow direction. The spacing between each battery 9 in the nine battery groups is [missing information]. The distance between the battery 9 near each side wall of the casing and the corresponding side wall is... In this embodiment, 20 18650 batteries 9 are welded into a 4×5 array to form a battery 9 module. Thermally conductive silicone pads are attached to both ends of the module, completing the pre-assembly of the battery 9 group. The batteries 9 are connected to each other via tabs 8 and busbars 7.

[0032] An inlet 5 and an outlet 6 are respectively provided on the front sidewall 1 and the rear sidewall 3 of the housing; in this embodiment, the inlet 5 and the outlet 6 are located on the left and right sides of the center of the front sidewall 1 and the rear sidewall 3 of the housing, and the diameters of the corresponding inlet 5 and outlet 6 are [missing information]. The positions of inlet 5 and outlet 6 are aligned with the center line of the battery 9 arrangement and are at the same height.

[0033] The left inner wall 2 and right inner wall 4 of the shell are periodic corrugated channel structures. The wavelength corresponding to the periodic corrugated channel structure is... The peak is In this embodiment, the walls of the left inner wall 2 and the right inner wall 4 along the flow direction are both processed into a periodic corrugated channel structure.

[0034] A flow diversion baffle 10 is arranged horizontally inside the housing. The center points of the flow diversion baffle 10, the inlet 5, and the outlet 6 are at the same height. The flow diversion baffle 10 has several mounting holes 12 for installing each battery 9 in the battery group 9. The flow diversion baffle 10 also has a turbulence baffle 11 perpendicular to the horizontal direction of the flow diversion baffle 10. In this embodiment, a corresponding flow diversion baffle 10 penetrating five rows of battery groups 9 is arranged parallel to the flow direction inside the housing. Specifically, the flow diversion baffle 10 has several mounting holes 12 for installing each battery 9 in the battery group 9. The batteries 9 of the battery group 9 are placed sequentially into the mounting holes 12. In this embodiment, the mounting holes 12 are arranged in five rows along the flow direction and four rows perpendicular to the flow direction. The length of the flow diversion baffle 10 along the flow direction is 86 nm.

[0035] The turbulence baffles 11 are respectively disposed on the upper and lower end faces of the diversion baffle 10. Multiple turbulence baffles 11 are provided. In this embodiment, turbulence baffles 11 are disposed perpendicular to the direction of the diversion baffle 10 in the upper and lower channels after diversion by the diversion baffle 10. Two turbulence baffles 11 are provided, located between the second and third rows of batteries 9, and between the fourth and fifth rows of batteries 9, respectively. In this embodiment, the height of the turbulence baffle 11 is... In this embodiment, the turbulence baffle 11 is fixed to both sides of the diversion baffle 10 by laser welding, with a positional accuracy of ±0.5 mm (vertical direction). The battery module 9 is placed into the housing, ensuring that the distance between the battery 9 and the corrugated sidewall is uniform (4 mm).

[0036] When the cooling system is started, the coolant is simultaneously injected from the dual inlets 5 on the front sidewall 1 of the housing, initiating its efficient heat dissipation circulation within the system. These two inlets 5 are located on the left and right sides of the center of the front sidewall 1 of the housing, aligned with the center line of the battery 9 arrangement and at the same height. This layout ensures that the coolant flows symmetrically to the battery 9 group area during the initial injection.

[0037] As soon as the coolant enters the casing, it is guided and disturbed by multiple structures. First, the periodic corrugated channel structure of the left inner wall 2 and right inner wall 4 of the casing comes into play, its... wavelength and The wave crests create a unique flow field. As the coolant flows through the corrugated channel, the periodic unevenness of the wall causes the flow direction to constantly change. Combined with the obstruction from the nine battery groups, the flow between the individual batteries within each of the nine battery groups... The spacing and the battery 9 near the side wall of the casing The spacing between the components forms a complex flow channel network, within which the coolant automatically generates numerous vortices. These vortices significantly increase the contact area and collision frequency between the coolant and the surface of battery 9 and the corrugated sidewalls, laying a solid foundation for subsequent heat exchange.

[0038] Meanwhile, the coolant encounters a horizontally positioned diversion baffle 10. The diversion baffle 10 is at the same height as the center points of the inlet 5 and the outlet 6, and has mounting holes 12 for installing the batteries 9. The batteries 9 of the battery pack pass through these mounting holes 12 and are fixed in place. Under the action of the eddy current and the physical separation of the diversion baffle 10, the coolant is naturally diverted to the upper and lower main channels.

[0039] As the coolant continues to flow in the direction of flow, a secondary deflection occurs when it reaches the baffle 11. The baffle 11 is vertically positioned on the upper and lower surfaces of the diversion baffle 10, and is located at specific locations—between the second and third rows of batteries 9, and between the fourth and fifth rows of batteries 9. When the coolant flows through these locations, it is blocked by the baffle 11, forcing a change in flow direction and resulting in a secondary deflection. After undergoing this secondary deflection, the coolant, carrying the heat absorbed from the battery pack 9, continues to flow towards the outlet 6 on the rear wall 3 of the casing.

[0040] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A dual-inlet shunt-type corrugated channel lithium battery immersion cooling system, characterized in that: Includes a battery housing for mounting a battery pack; the battery housing includes a shell with an opening at one end and a cover; The front and rear side walls of the housing are respectively provided with an inlet and an outlet; A flow divider baffle is provided horizontally inside the housing. The center point of the flow divider baffle, the inlet, and the outlet are at the same height. The flow divider baffle has several mounting holes for installing each battery in the battery pack. The flow divider baffle is also provided with a turbulence baffle perpendicular to the horizontal direction of the flow divider baffle.

2. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 1, characterized in that: The left and right inner walls of the shell are periodic corrugated channel structures.

3. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 2, characterized in that: The wavelength corresponding to the periodic corrugated channel structure is The peak is .

4. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 3, characterized in that: The spacing between the individual cells in the battery pack is The distance between the battery near each side wall of the casing and the corresponding side wall is .

5. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 1, characterized in that: The turbulence baffles are respectively disposed on the upper and lower surfaces of the diversion baffle.

6. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 5, characterized in that: Multiple baffles are provided.

7. The dual-inlet shunt-type corrugated channel lithium battery immersion cooling system according to claim 6, characterized in that: The height of the baffle is .

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