Roll-in type liquid cooling plate

Abstract

The utility model relates to the technical field of power batteries, and discloses a rolling type liquid cooling plate, which comprises a hollow liquid cooling plate frame body and shunting partition plates positioned in the liquid cooling plate frame body, and the shunting partition plates divide the interior of the liquid cooling plate frame body into a plurality of flow channels; the cross section of the shunting partition plate is wavy, the two side edges of the shunting partition plate in the length direction are fixedly connected with the side walls of the liquid cooling plate frame body, and the upper end and the lower end of the shunting partition plate are in contact with the upper side wall and the lower side wall of the liquid cooling plate frame body. In practical application, the liquid cooling plate disclosed by the utility model effectively improves the cooling effect while ensuring the structural strength, and effectively adapts to the development trend of high energy density of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a roll - pressed liquid cooling plate. Background Art

[0002] The liquid cooling plate is an important structure for regulating the temperature of the battery pack, improving the reliability and safety performance of the battery pack. In the existing market, the liquid cooling plates of battery packs are usually cavity - type liquid cooling plates formed by extrusion molding and profile liquid cooling plates formed by friction stir welding. At present, the main development trend of battery packs is to pursue high energy density. With the increase of energy density, the temperature and heat in the battery pack increase significantly and at a faster rate. However, the wall thickness between the flow channels of the existing two - structure liquid cooling plates is relatively large, which directly affects the effective heat exchange area of the liquid cooling plate, and then reduces its overall heat exchange efficiency. In addition, the wall thickness of the cavity of such liquid cooling plates is relatively thick, occupying the precious Z - direction space (i.e., the space perpendicular to the arrangement direction of battery cells), restricting the layout and optimization of flow channels within a limited volume, resulting in the reduction of the effective cooling area, and then affecting the cooling performance of the entire battery pack. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a roll - pressed liquid cooling plate to solve the problem that the cooling effect of the existing liquid cooling plate on the battery pack cannot adapt to the development trend of high energy density of the battery pack.

[0004] To achieve the above - mentioned purpose, the utility model adopts the following technical scheme: a roll - pressed liquid cooling plate, which includes a liquid cooling plate frame body with a hollow interior and a flow - dividing partition located inside the liquid cooling plate frame body. The flow - dividing partition divides the interior of the liquid cooling plate frame body into multiple flow channels; the cross - section of the flow - dividing partition is wavy, and the two side edges of the flow - dividing partition along the length direction are fixedly connected to the side walls of the liquid cooling plate frame body, and both the upper and lower ends of the flow - dividing partition are in contact with the upper and lower side walls of the liquid cooling plate frame body.

[0005] The principle and advantages of this scheme are as follows:

[0006] 1. Compared with the vertical partitions inside the existing liquid cooling plates, the wavy design of the flow-dividing partitions in this solution is similar to an arch structure. Under the action of vertical loads, the horizontal thrust and vertical reaction force generated by the flow-dividing partitions act together, causing most of the bending moment of the flow-dividing partitions to be converted into compressive stress. When the flow-dividing partitions are loaded, they are mainly in a compressive state. Moreover, the wavy design makes the overall stress-bearing area of the flow-dividing partitions larger and can distribute the load to the entire cross-section, effectively avoiding structural bending deformation and failure caused by excessive local stress. The flow-dividing partitions have high load-bearing capacity and stability, thereby enhancing the overall structural strength and stability of the liquid cooling plate. Further, due to the sufficient structural strength and load-bearing capacity of the flow-dividing partitions, the liquid cooling plate frame does not need to be the main load-bearing component and does not require high strength. Therefore, the wall thickness of the liquid cooling plate frame can be reduced, reducing the space occupied by the wall thickness of the liquid cooling plate frame in the Z direction and giving more flow space to the coolant, enhancing the cooling effect of the liquid cooling plate.

[0007] 2. Compared with the vertically arranged partitions dispersed inside the existing liquid cooling plates, the flow-dividing partitions in this solution cover the entire inside of the liquid cooling plate in the width direction, enabling the coolant to be evenly distributed among all battery cells, avoiding local overheating, and achieving the overall temperature balance of the battery pack. Moreover, the wavy design increases the structural complexity of the flow-dividing partitions, making the flow state of the coolant in the liquid cooling plate more active, with higher heat exchange efficiency with the outside world and better cooling effect.

[0008] Further, the wall thickness of the liquid cooling plate frame is 0.5 - 1 mm.

[0009] The wall thickness of the existing cavity-type liquid cooling plates and profile liquid cooling plates formed by friction stir welding is usually 3 mm. For the same space in the same vehicle model, the wall thickness of the liquid cooling plate frame in this solution is 0.5 - 1 mm, reducing the space occupancy in the Z direction by 60% - 80%, effectively increasing the flow channel space inside the liquid cooling plate and allowing more coolant to flow through, greatly enhancing the cooling effect of the liquid cooling plate on the battery pack. The wall thickness of the liquid cooling plate being 0.5 - 1 mm reduces the material consumption of the liquid cooling plate in this solution by 3 - 6 times compared with the existing liquid cooling plates, significantly reducing the material cost and the overall weight of the liquid cooling plate, which is beneficial to improving the endurance and comprehensive performance of the whole vehicle.

[0010] Further, the horizontal distance between adjacent wave crests and wave troughs of the flow-dividing partitions is 7 - 9 mm.

[0011] The above settings enable the arc segments of the flow-dividing partition to be reasonably distributed within the liquid-cooling plate housing, ensuring sufficient structural strength of the overall liquid-cooling plate while saving production costs. Although a too small lateral distance makes the overall liquid-cooling plate have higher structural strength, it causes the arc radius of the arc segments of the flow-dividing partition to be too small, requiring a roll-forming die with a smaller size, and the die cost is high, which is not conducive to reducing the overall production cost. A too large lateral distance results in insufficient support force in some areas on the surface of the liquid-cooling plate housing when stressed, making it prone to damage, affecting the integrity and reliability of the liquid-cooling plate structure and the safety of the battery pack.

[0012] Further, the arc segments where the wave crests and wave troughs of the flow-dividing partition are located are both semi-circular arcs.

[0013] The above-mentioned arc segments that make up the flow-dividing partition are all semi-circular arcs because the requirements for roll-forming equipment, processes, and roll-forming dies for forming a semi-circular structure are relatively simple, effectively saving costs while ensuring sufficient structural strength of the flow-dividing partition.

[0014] Further, the flow-dividing partition is a roll-formed integral structure.

[0015] The above setting ensures the material continuity between the arched structures in the flow-dividing partition formed by roll-forming, which is beneficial to the uniform distribution of stress within the overall flow-dividing partition, enhancing the overall compressive performance and structural strength of the flow-dividing partition.

[0016] Further, the plate thickness of the flow-dividing partition is the same as the wall thickness of the liquid-cooling plate housing.

[0017] The same plate thickness and wall thickness can reduce the complexity of die replacement and processing parameter adjustment during the production process, effectively reducing costs and improving production efficiency; at the same time, the consistent plate thickness of the flow-dividing partition and the wall thickness of the liquid-cooling plate housing can make the strength distribution of each part more balanced when the liquid-cooling plate bears the internal coolant pressure and external mechanical loads, avoiding the emergence of weak points and enhancing the firmness of the overall structure.

[0018] Further, the liquid-cooling plate housing is a roll-formed integral structure, and the starting end face and the ending end face of the liquid-cooling plate housing are fixed by welding.

[0019] The above setting makes the overall structure of the liquid-cooling plate housing continuous, reduces the multi-component assembly relationship, and effectively increases the sealing performance and structural strength of the liquid-cooling plate housing.

[0020] Further, the liquid-cooling plate housing and the flow-dividing partition are of a roll-formed integral structure.

[0021] On the one hand, the above settings make the material continuous, enhance the overall rigidity and strength of the structure, reduce the structural weak points that may be brought about by connection methods such as welding or bonding, and improve the overall mechanical properties and durability of the liquid cooling plate. On the other hand, the one-piece forming process simplifies the manufacturing process, avoids the complexity and assembly errors of multi-component assembly, improves the consistency and reliability of the product. At the same time, the simplification of the manufacturing process reduces the labor and equipment investment, and lowers the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0023] Figure 2 It is a schematic diagram of the shape of the flow channel opening of the liquid cooling plate.

[0024] Figure 3 For Figure 2 The partial enlarged view of part A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following is a further detailed description through specific embodiments:

[0026] The reference numerals in the accompanying drawings of the specification include: liquid cooling plate 1, liquid cooling plate frame 2, shunt partition 3, wave crest 4, wave trough 5.

[0027] The embodiment is basically as shown in the attached Figures 1 - 3 shown: A roll-pressed liquid cooling plate 1 includes a liquid cooling plate frame 2 with a hollow interior and a shunt partition 3 located inside the liquid cooling plate frame 2. The two ends of the liquid cooling plate frame 2 are respectively the flow channel inlet and the flow channel outlet of the liquid cooling plate 1. As shown by the arrow in Figure 1 the direction of the arrow is the flow direction of the coolant; the wall thickness of the liquid cooling plate frame 2 is 0.5 - 1 mm, and the liquid cooling plate frame 2 is a one-piece forming structure, which is formed by rolling a thin aluminum coil or strip and then connecting the starting end face and the ending end face of the liquid cooling plate frame 2 by brazing. The wall thickness of the existing cavity-type liquid cooling plate and the profile liquid cooling plate formed by friction stir welding is usually 3 mm. For the same space of the same vehicle model, the wall thickness of the liquid cooling plate frame 2 in this solution is 0.5 - 1 mm, and the space occupancy in the Z direction is reduced by 60% - 80%, effectively increasing the flow channel space inside the liquid cooling plate 1 and allowing more coolant to flow through, greatly increasing the cooling effect of the liquid cooling plate 1 on the battery pack. Secondly, the wall thickness of the liquid cooling plate 1 being 0.5 - 1 mm makes the material consumption of the liquid cooling plate 1 in this solution reduced by 3 - 6 times compared with the existing liquid cooling plate, and the material cost and the overall weight of the liquid cooling plate 1 are significantly reduced, which is beneficial to improving the cruising range and comprehensive performance of the whole vehicle.

[0028] The flow divider 3 is an integrally formed structure, formed by rolling a thin aluminum coil or strip. The cross section of the flow divider 3 is wavy, and the arc segments where the wave crests 4 and the wave troughs 5 of the flow divider 3 are located are semicircular arcs, and there is a smooth transition between two adjacent arc segments; the flow divider 3 divides the interior of the liquid cooling plate frame 2 into multiple flow channels, and the side edges of the flow divider 3 along the length direction are connected and fixed to the side walls of the liquid cooling plate frame 2, and the upper and lower ends of the flow divider 3 are in contact with the upper and lower side walls of the liquid cooling plate frame 2.

[0029] Through the above arrangement, compared with the dispersed vertical partitions inside the existing liquid cooling plate, on the one hand, the wave-shaped design of the diverter partition 3 is similar to an arch structure. Under the action of the vertical load, the horizontal thrust generated by the diverter partition 3 and the vertical reaction force work together, so that most of the bending moment of the diverter partition 3 is converted into compressive stress. When the diverter partition 3 is loaded, it is mainly in a compressive state, with high bearing capacity and stability, thereby enhancing the overall structural strength and stability of the liquid cooling plate 1. Moreover, because the diverter partition 3 has sufficient structural strength and bearing strength, the liquid cooling plate frame 2 does not need to be the main bearing component, and does not require high strength, so the liquid cooling plate frame 2 can reduce the wall thickness, give the coolant more flow space, and enhance the cooling effect of the liquid cooling plate 1; on the other hand, the wavy design makes the overall force-bearing area of ​​the diverter baffle 3 larger and can distribute the load to the entire cross section, effectively avoiding local stress excessively causing the structure to bend and deform and fail. Secondly, the diverter baffle 3 is spread throughout the entire liquid cooling plate 1 along the width direction, so that the coolant is evenly distributed among all battery cells, avoiding local overheating and achieving the overall temperature balance of the battery pack. The wavy design increases the structural complexity of the diverter baffle 3, making the flow state of the coolant in the liquid cooling plate 1 more active, the heat exchange efficiency with the outside world is higher, and the cooling effect is better.

[0030] The lateral distance between two adjacent wave crests 4 and troughs 5 of the diverter baffle 3 is 7 to 9 mm. This arrangement allows the arc segments of the diverter baffle 3 to be reasonably distributed in the liquid cooling plate frame 2, ensuring that the liquid cooling plate 1 as a whole has sufficient structural strength while saving production costs. Although a small lateral distance makes the liquid cooling plate 1 as a whole have a higher structural strength, a small lateral distance causes the arc radius of the arc segment of the diverter baffle 3 to be too small, requiring a smaller rolling mold. The high mold cost is not conducive to reducing the overall production cost. A large lateral distance causes the surface of the liquid cooling plate frame 2 to have insufficient support strength in some areas when subjected to force, which is prone to damage, affecting the structural integrity and reliability of the liquid cooling plate 1 and the safety of the battery pack.

[0031] Preferably, in this embodiment, the thickness of the flow dividing partition plate 3 is the same as the wall thickness of the liquid cooling plate frame 2. This can reduce the complexity of mold replacement and processing parameter adjustment during the production process, effectively reduce costs and improve production efficiency. At the same time, the thickness of the flow dividing partition plate 3 being consistent with the wall thickness of the liquid cooling plate frame 2 can make the strength distribution of each part of the liquid cooling plate 1 more balanced when bearing the internal coolant pressure and external mechanical load, avoid the emergence of weak points, and enhance the firmness of the overall structure.

[0032] Preferably, the liquid cooling plate frame 2 and the flow dividing partition plate 3 are of an integrally formed structure, integrally formed by rolling the same piece of aluminum material. The starting end and the ending section of the aluminum material are respectively connected and fixed to the flow dividing partition plate 3 by brazing to achieve the sealing of the internal flow channels of the liquid cooling plate 1. During specific manufacturing, first, the flow dividing partition plate 3 is rolled, then the aluminum materials on both sides of the flow dividing partition plate 3 are rolled to form the liquid cooling plate frame 2, and then the two end faces of the liquid cooling plate frame 2 are welded and fixed to the flow dividing partition plate 3. On the one hand, the integrally formed liquid cooling plate 1 makes the material continuous, enhances the overall rigidity and strength of the structure, reduces the possible structural weak points caused by connection methods such as welding or bonding, and improves the overall mechanical properties and durability of the liquid cooling plate 1. On the other hand, the integrally formed process simplifies the manufacturing process, avoids the complexity of multi-component assembly and assembly errors, improves the consistency and reliability of the product, and at the same time, the simplification of the manufacturing process reduces the labor and equipment investment and lowers the production cost.

[0033] The above are only embodiments of the present utility model. Specific technical solutions and / or common knowledge such as characteristics that are well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A roller-pressed liquid cooling plate, characterized in that: It includes a liquid cooling plate frame with a hollow interior and a diverter partition located in the liquid cooling plate frame, wherein the diverter partition divides the interior of the liquid cooling plate frame into a plurality of flow channels; the cross section of the diverter partition is wavy, and the two side edges of the diverter partition along the length direction are connected and fixed to the side walls of the liquid cooling plate frame, and the upper and lower ends of the diverter partition are in contact with the upper and lower side walls of the liquid cooling plate frame.

2. The roller-pressed liquid cooling plate according to claim 1, characterized in that: The wall thickness of the liquid cooling plate frame is 0.5-1 mm.

3. The roller-pressed liquid cooling plate according to claim 2, characterized in that: The lateral distance between adjacent wave crests and wave troughs of the flow dividing baffle is 7 to 9 mm.

4. The roller-pressed liquid cooling plate according to claim 3, characterized in that: The arc sections where the crests and troughs of the diversion baffle are located are both semicircular arcs.

5. The roller-pressed liquid cooling plate according to claim 4, characterized in that: The flow dividing baffle is a roll-pressed integrally formed structure.

6. The roller-pressed liquid cooling plate according to claim 5, characterized in that: The plate thickness of the flow dividing plate is the same as the wall thickness of the liquid cooling plate frame.

7. The roller-pressed liquid cooling plate according to claim 6, characterized in that: The liquid cooling plate frame is a roll-pressed integrally formed structure, and the starting end face and the ending end face of the liquid cooling plate frame are fixed by welding.

8. The roller-pressed liquid cooling plate according to claim 7, characterized in that: The liquid cooling plate frame and the flow dividing plate are integrally formed by rolling.

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