Lithium iron phosphate battery pack liquid cooling plate structure

Abstract

The utility model relates to battery technology field, specifically disclose a kind of lithium iron phosphate battery package liquid cooling plate structure, including liquid cooling plate, the structure further includes several groups of liquid cooling flow channel, the liquid cooling flow channel includes liquid inlet, liquid outlet, main flow channel, side flow channel and bus duct, the both ends of main flow channel are liquid inlet and liquid outlet respectively, and the side of main flow channel is symmetrically connected with several groups of side flow channel, and the tail end of several side flow channels is communicated with bus duct, and the bus duct is communicated with liquid outlet, and the liquid cooling flow channel is analog human capillary fractal structure. By being designed as analog human capillary fractal structure to liquid cooling flow channel, so that the flow path of lengthening coolant is while making the coolant in several side flow channels and battery sufficient heat exchange, to improve overall heat dissipation efficiency, and simultaneously several side flow channels can reduce the flow resistance of coolant, to reduce energy consumption, improve overall heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a liquid cooling plate structure for a lithium iron phosphate battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, lithium iron phosphate batteries have been widely adopted due to their high safety and long cycle life. Batteries generate heat during operation; if this heat cannot be dissipated in time, the battery pack temperature will rise, the temperature difference will increase, accelerating performance degradation, shortening lifespan, and even triggering thermal runaway. Therefore, efficient and uniform thermal management is crucial for ensuring battery safety and performance.

[0003] In existing technologies, liquid cooling plates are the mainstream solution for thermal management, typically placed on the bottom or side of the battery pack. The liquid cooling plate has internal coolant channels, relying on the flow of coolant to remove heat from the battery. Currently, common traditional channel types mainly include parallel channels, serpentine channels, and direct-flow channels.

[0004] However, these traditional flow channel designs have several inherent drawbacks. While parallel and direct-flow channels are structurally simple, their short coolant flow paths result in insufficient heat exchange with the plate, leading to low overall heat dissipation efficiency. Furthermore, slight differences in flow resistance between parallel branches can cause uneven coolant flow distribution, resulting in inconsistent cooling effects across different areas of the battery pack and the formation of localized hot spots. Serpentine flow channels improve heat transfer capacity by extending the flow path, but their continuous sharp turns introduce significant local resistance, leading to excessive system flow resistance. This necessitates a more powerful pump, increasing system energy consumption and operating costs. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a liquid cooling plate structure for lithium iron phosphate battery packs, thereby solving the technical problems of low heat dissipation efficiency, uneven coolant flow distribution, and high flow resistance in existing liquid cooling plates.

[0006] The objective of this utility model can be achieved through the following technical solutions: A liquid cooling plate structure for a lithium iron phosphate battery pack includes a liquid cooling plate and a plurality of liquid cooling channels. The liquid cooling channels include an inlet, an outlet, a main channel, side channels, and a confluence channel. The two ends of the main channel are the inlet and the outlet, respectively. A plurality of side channels are symmetrically connected to the sides of the main channel. The ends of the side channels are connected to the confluence channel, and the confluence channel is connected to the outlet. The liquid cooling channels are designed to mimic the fractal structure of human capillaries.

[0007] As a preferred embodiment of the above technical solution, the two adjacent sets of liquid cooling channels are symmetrical along the center line of the vertical center point of the outermost side channel.

[0008] As a preferred embodiment of the above technical solution, the liquid cooling plate has several sets of cavities, which are located between the main flow channel and the side flow channel or between two sets of side flow channels, and the cavities are filled with cooling oil.

[0009] As a preferred embodiment of the above technical solution, a plurality of U-shaped plates are installed in the cavity. The cross-section of the U-shaped plate is U-shaped. The U-shaped plate is located above the main flow channel or the side flow channel. The two sides of the U-shaped plate are fixedly connected to the two sides of the main flow channel or the two sides of the side flow channel. There is a distance between the top surface of the U-shaped plate and the top surface of the main flow channel or the side flow channel.

[0010] As a preferred embodiment of the above technical solution, ear plates are provided on both sides of the main flow channel and the side flow channel, and the side of the U-shaped plate is fixedly connected to the ear plates.

[0011] As a preferred embodiment of the above technical solution, the cavity is provided with a plurality of protruding plates, the number of which is the same as the number of U-shaped plates, and the protruding plates abut against the top of the U-shaped plates.

[0012] The beneficial effects of this utility model are as follows: 1. In this utility model, by designing the liquid cooling channel as a fractal structure that simulates human capillaries, the flow path of the coolant is lengthened while allowing the coolant in several side channels to fully exchange heat with the battery, thereby improving the overall heat dissipation efficiency. At the same time, the several side channels can reduce the flow resistance of the coolant, thereby reducing energy consumption and improving the overall heat dissipation effect. 2. In this invention, when the lithium iron phosphate battery expands, the expanded area will compress the surface of the liquid cooling plate. This causes the convex plate inside the liquid cooling plate to compress the U-shaped plate at the corresponding position, resulting in the middle of the U-shaped plate being compressed. This causes the two plates of the U-shaped plate to tend to expand outward. Through the cooperation of the ear plates, the U-shaped plate stretches the two sides of the main flow channel and the side flow channel outward after deformation. In this way, even if the main flow channel and the side flow channel are compressed and deformed, the cross-sectional area of ​​the main flow channel and the side flow channel can be kept as constant as possible, so that the flow rate of the coolant at this point remains constant, thereby ensuring that the heat dissipation effect at this point is normal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the liquid cooling plate flow channel. Figure 3 This is a schematic diagram of the cross-sectional structure of the liquid cooling plate flow channel.

[0014] In the picture: 1. Liquid cooling plate; 2. Liquid cooling channel; 3. Liquid inlet; 4. Liquid outlet; 5. Main channel; 6. Side channel; 7. Manifold; 8. Cavity; 9. U-shaped plate; 10. Ear plate; 11. Convex plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 and Figure 2 As shown, a liquid cooling plate structure for a lithium iron phosphate battery pack includes a liquid cooling plate 1 and several sets of liquid cooling channels 2. Each liquid cooling channel 2 includes an inlet 3, an outlet 4, a main channel 5, side channels 6, and a confluence channel 7. The two ends of the main channel 5 are the inlet 3 and the outlet 4, respectively. Several sets of side channels 6 are symmetrically connected to the sides of the main channel 5. The ends of the side channels 6 are connected to the confluence channel 7, and the confluence channel 7 is connected to the outlet 4. The liquid cooling channel 2 is a fractal structure that simulates human capillaries.

[0017] Furthermore, the two adjacent sets of liquid cooling channels 2 are symmetrical along the vertical center line of the outermost side channel 6.

[0018] In practical application, the coolant enters the liquid cooling channel 2 through the inlet 3. Part of the coolant flows in the main channel 5, and another part flows in the side channels 6. Finally, both flow into the confluence channel 7 and are discharged from the outlet 4. By designing the liquid cooling channel 2 to simulate the fractal structure of human capillaries, the flow path of the coolant is lengthened while allowing the coolant in several side channels to fully exchange heat with the battery, thereby improving the overall heat dissipation efficiency. At the same time, the several side channels 6 can reduce the flow resistance of the coolant, thereby reducing energy consumption and improving the overall heat dissipation effect.

[0019] like Figure 3 As shown, the liquid cooling plate 1 has several sets of cavities 8. The cavities 8 are located between the main flow channel 5 and the side flow channel 6 or between two sets of side flow channels 6. The cavities 8 are filled with cooling oil.

[0020] Several sets of U-shaped plates 9 are installed inside the cavity 8. The cross-section of the U-shaped plate 9 is U-shaped. The U-shaped plate 9 is located above the main flow channel 5 or the side flow channel 6. The two sides of the U-shaped plate 9 are fixedly connected to the two sides of the main flow channel 5 or the two sides of the side flow channel 6. There is a distance between the top surface of the U-shaped plate 9 and the top surface of the main flow channel 5 or the side flow channel 6.

[0021] Both sides of the main flow channel 5 and the side flow channel 6 are provided with ear plates 10, and the side of the U-shaped plate 9 is fixedly connected to the ear plates 10.

[0022] The cavity 8 is provided with a number of protruding plates 11, the number of which is the same as the number of U-shaped plates 9, and the protruding plates 11 abut against the top of the U-shaped plates 9.

[0023] It should be noted that lithium iron phosphate batteries may expand due to high temperatures during use. This expansion will cause the expanded area of ​​the lithium iron phosphate battery to squeeze the liquid cooling plate 1, which will cause the liquid cooling channel 2 to deform under pressure, reducing the channel diameter and thus reducing the heat dissipation effect.

[0024] In practical application, when the lithium iron phosphate battery expands, the expanded area will compress the surface of the liquid cooling plate 1. This causes the protruding plate 11 inside the liquid cooling plate 1 to compress the U-shaped plate 9 at the corresponding position, resulting in the middle position of the U-shaped plate 9 being compressed. This causes the two plates of the U-shaped plate 9 to tend to expand outward. With the cooperation of the ear plate 10, the U-shaped plate 9 stretches the two sides of the main flow channel 5 and the side flow channel 6 outward after deformation. In this way, even if the main flow channel 5 and the side flow channel 6 are compressed and deformed, the cross-sectional area of ​​the main flow channel 5 and the side flow channel 6 can be kept as constant as possible, so that the flow rate of the coolant at this point remains constant, thereby ensuring that the heat dissipation effect at this point is normal. The cooling oil in cavity 8 can absorb the heat generated by the lithium iron phosphate battery. In this way, the coolant can absorb the heat transferred from the surface of the liquid cooling plate 1. At the same time, the coolant also absorbs the heat absorbed by the cooling oil, thereby improving the heat absorption effect of the coolant and thus improving the overall heat dissipation efficiency.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A liquid cooling plate structure for a lithium iron phosphate battery pack, comprising a liquid cooling plate (1), characterized in that, The structure also includes several sets of liquid cooling channels (2). The liquid cooling channels (2) include an inlet (3), an outlet (4), a main channel (5), a side channel (6), and a confluence channel (7). The two ends of the main channel (5) are the inlet (3) and the outlet (4), respectively. Several sets of side channels (6) are symmetrically connected to the side of the main channel (5). The ends of the side channels (6) are connected to the confluence channel (7). The confluence channel (7) is connected to the outlet (4). The liquid cooling channels (2) are fractal structures that simulate human capillaries.

2. The liquid cooling plate structure for a lithium iron phosphate battery pack according to claim 1, characterized in that, The two adjacent sets of liquid cooling channels (2) are symmetrical along the center line of the vertical center point of the outermost side channel (6).

3. The liquid cooling plate structure for a lithium iron phosphate battery pack according to claim 1, characterized in that, The liquid cooling plate (1) has several cavities (8) inside. The cavities (8) are located between the main flow channel (5) and the side flow channel (6) or between two sets of side flow channels (6). The cavities (8) are filled with cooling oil.

4. The liquid cooling plate structure for a lithium iron phosphate battery pack according to claim 3, characterized in that, Several sets of U-shaped plates (9) are installed in the cavity (8). The cross-section of the U-shaped plate (9) is U-shaped. The U-shaped plate (9) is located above the main channel (5) or the side channel (6). The two sides of the U-shaped plate (9) are fixedly connected to the two sides of the main channel (5) or the two sides of the side channel (6). There is a distance between the top surface of the U-shaped plate (9) and the top surface of the main channel (5) or the side channel (6).

5. The liquid cooling plate structure for a lithium iron phosphate battery pack according to claim 4, characterized in that, Both sides of the main flow channel (5) and the side flow channel (6) are provided with ear plates (10), and the side of the U-shaped plate (9) is fixedly connected to the ear plates (10).

6. The liquid cooling plate structure for a lithium iron phosphate battery pack according to claim 5, characterized in that, The cavity (8) is provided with a number of protruding plates (11), the number of which is the same as the number of U-shaped plates (9), and the protruding plates (11) abut against the top of the U-shaped plates (9).

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