Double-layer Y-shaped forked flow channel liquid cooling plate heat dissipation device

Abstract

The utility model discloses a double-layer Y-shaped forked flow channel liquid cooling plate heat dissipation device, and belongs to the technical field of battery thermal management. Comprising a lithium battery pack, a heat conduction plate set and a liquid cooling plate set, the lithium battery pack is composed of a plurality of single lithium batteries, the heat conduction plate set is composed of a plurality of single heat conduction plates, the liquid cooling plate set is composed of two single liquid cooling plates, and the single lithium batteries and the single heat conduction plates are arranged in the vertical direction in a crossed mode. The two liquid cooling plates are arranged on the two sides of the transverse direction of the battery pack and the heat conduction plate set respectively, each single liquid cooling plate comprises a right plate, a middle plate and a left plate which are fixed together, the right plate and the left plate are provided with the same Y-shaped forked flow channels and are oppositely fixed to the two sides of the middle plate, and the liquid inlet direction and the liquid outlet direction of the right plate and the liquid outlet direction of the left plate are opposite. The cooling liquid flow channel in the double-layer Y-shaped forked cold plate adopts a Y-shaped topological flow channel structure, so that the power consumption of an electronic water pump can be effectively reduced, and the temperature difference range of a battery pack can be effectively controlled.

Description

Technical Field

[0001] The utility model relates to a double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device, in particular to a double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device for square lithium battery packs, belonging to the technical field of battery thermal management. Background Art

[0002] In recent years, with the advent of the new energy era, the shortcomings of traditional fuel-powered vehicles, such as high fuel consumption, high pollution, and high noise, have become increasingly prominent. New energy vehicles are gaining popularity due to their low pollution and low noise levels. Lithium batteries, with their high energy density, stable safety performance, and long cycle life, are often used as the energy source for new energy vehicles. However, lithium batteries are particularly sensitive to temperature. Their optimal operating temperature range is 20-40°C, with a temperature difference within the battery pack of within 5°C. Excessive temperatures can lead to safety issues such as shortened lifespan, voltage abnormalities, and thermal runaway. Currently, lithium battery heat dissipation methods during operation include air cooling, liquid cooling, phase change cooling, and heat pipe cooling. Liquid cooling is the safest, most reliable, and most commonly used. Liquid cooling typically utilizes traditional serpentine and parallel flow channel structures. However, traditional serpentine cold plates, due to their single "serpentine" flow channel, result in excessive pressure drop within the channel during operation, consuming significant energy. The parallel channel cold plate has an unreasonable structural design, which leads to uneven flow distribution in the channel, resulting in excessive temperature difference in the battery pack and poor overall heat dissipation effect. Utility Model Content

[0003] The purpose of the utility model is to provide a double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device, which has the advantages of low system energy consumption and good heat dissipation effect.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device, comprising a lithium battery pack 10, a heat conducting plate group 20 and a liquid cooling plate group 30, the lithium battery pack 10 is composed of a plurality of single lithium batteries, the heat conducting plate group 20 is composed of a plurality of single heat conducting plates, the liquid cooling plate group 30 is composed of two single liquid cooling plates, the single lithium batteries and the single heat conducting plates are arranged crosswise in the vertical direction, and the two liquid cooling plates are respectively arranged on both sides of the battery pack 10 and the heat conducting plate group 20 in the horizontal direction, and the single liquid cooling plate includes a right plate 301, a middle plate 302 and a left plate 303 fixed together, the right plate 301 and the left plate 303 have the same Y-shaped bifurcated flow channel and are relatively fixed on both sides of the middle plate 302, and the liquid inlet direction and the liquid outlet direction of the right plate 301 and the left plate 303 are opposite.

[0005] Specifically, the right plate 301 is provided with one right plate liquid inlet 3011 and four right plate liquid outlets 3017, and a flow channel with a Y-shaped bifurcation structure is provided between the right plate liquid inlet 3011 and the right plate liquid outlet 3017. The left plate 303 is provided with one left plate liquid inlet 3031 and four left plate liquid outlets 3037, and a flow channel with a Y-shaped bifurcation structure is provided between the left plate liquid inlet 3031 and the left plate liquid outlet 3037. The right plate liquid inlet 3011 and the left plate liquid outlet 3037 are located at the upper end of the single liquid cold plate, and the right plate liquid outlet 3017 and the left plate liquid inlet 3031 are located at the lower end of the single liquid cold plate.

[0006] Specifically, the Y-shaped bifurcated flow channel in the right plate 301 includes 1 primary branch channel 3012, 2 secondary branch channels 3013, 4 tertiary branch channels 3014, 12 quaternary branch channels 3015 and 4 liquid outlet converging flow channels 3016. The right plate liquid inlet 3011 is interconnected with the adjacent primary branch channel 3012, the primary branch channel 3012 is interconnected with each adjacent secondary branch channel 3013, each secondary branch channel 3013 is interconnected with each adjacent tertiary branch channel 3014, each tertiary branch channel 3014 is interconnected with each adjacent quaternary branch channel The branch channels 3015 are interconnected, and each of the four-level branch channels 3015 converges into the adjacent liquid outlet converging channels 3016 respectively. Each liquid outlet converging channel 3016 is interconnected with each right plate liquid outlet 3017. The Y-shaped bifurcated channel in the left plate 303 and the Y-shaped bifurcated channel in the right plate 301 have the same channel structure, but the directions of the two Y-shaped bifurcated channels are opposite. In the left plate 303, the left plate liquid inlet 3031 is interconnected with the adjacent first-level branch channel 3012, and each liquid outlet converging channel 3016 is interconnected with each left plate liquid outlet 3037.

[0007] Preferably, the width of the primary branch channel 3012 is The width of the secondary branch channel 3013 is in The angle between the primary branch channel 3012 and the secondary branch channel 3013 is The width of the third-level tributary channel 3014 is in The angle between the secondary branch channel 3013 and the tertiary branch channel 3014 is The width of the fourth-level tributary channel 3015 is and The width of the liquid converging channel 3016 is in The angle between the fourth-level branch channel 3015 and the outlet converging channel 3016 is in

[0008] Preferably, the thickness of the right plate 301 is selected within the range of 2.5 mm to 5.5 mm, the thickness of the middle plate 302 is selected within the range of 0.5 mm to 1.5 mm, and the thickness of the left plate 303 is selected within the range of 2.5 mm to 5.5 mm.

[0009] Preferably, the heat conducting plate group 20 and the liquid cooling plate group 30 are both made of aluminum alloy.

[0010] The beneficial effects of the present invention are as follows: the present invention provides a double-layer Y-shaped bifurcated flow channel liquid cold plate heat dissipation device, in which the coolant flow channel in the double-layer Y-shaped bifurcated cold plate adopts a double-layer identical letter "Y"-shaped topological flow channel structure. Under the condition of the same coolant parameters, compared with the traditional parallel flow channel and serpentine flow channel structure, the flow fluidity of the coolant in the branch channels at all levels is more uniform and the heat absorption capacity is stronger, so that the maximum temperature, temperature difference and system power consumption of the lithium battery pack during operation are lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a single liquid cold plate of the utility model;

[0012] Figure 2 This is an exploded view of the structure of a single liquid cooling plate of the present invention;

[0013] Figure 3 This is a schematic diagram of the right plate structure of the utility model;

[0014] Figure 4 This is a schematic diagram of the middle plate structure of the utility model;

[0015] Figure 5 This is a schematic diagram of the left plate structure of the utility model;

[0016] Figure 6 This is a schematic diagram of the right plate flow channel structure of the present utility model;

[0017] Figure 7 This is a schematic diagram of the width dimension structure of the right plate flow channel of the present invention;

[0018] Figure 8 This is a schematic diagram of the coolant flow direction of the right plate flow channel of the present invention;

[0019] Figure 9 This is a schematic diagram of the coolant flow direction of the left plate flow channel of the present invention;

[0020] Figure 10 This is an exploded view of the utility model applied to a lithium battery pack;

[0021] Figure 11 This is a schematic diagram of the utility model applied to a lithium battery pack.

[0022] The numbers in the figure are: lithium battery pack 10; heat conduction plate group 20; liquid cooling plate group 30; right plate 301; middle plate 302; left plate 303; right plate liquid inlet 3011; first-level branch channel 3012; second-level branch channel 3013; third-level branch channel 3014; fourth-level branch channel 3015; liquid outlet converging channel 3016; right plate liquid outlet 3017; left plate liquid inlet 3031; left plate liquid outlet 3037. DETAILED DESCRIPTION

[0023] The technical solutions in the examples of the utility model of the present application are described in detail with reference to the accompanying drawings of the utility model of the present application.

[0024] Example 1: Figure 1-11 As shown, a double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device includes a lithium battery pack 10, a heat conducting plate group 20 and a liquid cooling plate group 30. The lithium battery pack 10 is composed of multiple single lithium batteries, the heat conducting plate group 20 is composed of multiple single heat conducting plates, and the liquid cooling plate group 30 is composed of two single liquid cooling plates. The single lithium batteries and the single heat conducting plates are arranged crosswise in the vertical direction. The two liquid cooling plates are respectively arranged on both sides of the battery pack 10 and the heat conducting plate group 20 in the horizontal direction. The single liquid cooling plate includes a right plate 301, a middle plate 302 and a left plate 303 fixed together. The right plate 301 and the left plate 303 have the same Y-shaped bifurcated flow channel and are relatively fixed on both sides of the middle plate 302. The liquid inlet direction and the liquid outlet direction of the right plate 301 and the left plate 303 are opposite.

[0025] Further, if Figure 3 、 Figure 5 As shown, the right plate 301 is provided with a right plate liquid inlet 3011 and four right plate liquid outlets 3017, and a flow channel with a Y-shaped bifurcation structure is provided between the right plate liquid inlet 3011 and the right plate liquid outlet 3017. The left plate 303 is provided with a left plate liquid inlet 3031 and four left plate liquid outlets 3037, and a flow channel with a Y-shaped bifurcation structure is provided between the left plate liquid inlet 3031 and the left plate liquid outlet 3037. The right plate liquid inlet 3011 and the left plate liquid outlet 3037 are located at the upper end of the single liquid cold plate, and the right plate liquid outlet 3017 and the left plate liquid inlet 3031 are located at the lower end of the single liquid cold plate, that is, the right plate liquid inlet 3011 and the left plate liquid outlet 3037 are located on the same side, and the right plate liquid outlet 3017 and the left plate liquid inlet 3031 are located on the same side.

[0026] Further, if Figure 6As shown, the Y-shaped bifurcated flow channel in the right plate 301 includes one primary branch channel 3012, two secondary branch channels 3013, four tertiary branch channels 3014, 12 quaternary branch channels 3015 and four liquid outlet converging flow channels 3016. The right plate liquid inlet 3011 is interconnected with the adjacent primary branch channel 3012, the primary branch channel 3012 is interconnected with each adjacent secondary branch channel 3013, each secondary branch channel 3013 is interconnected with each adjacent tertiary branch channel 3014, each tertiary branch channel 3014 is interconnected with each adjacent quaternary branch channel The flow channels 3015 are interconnected, and each of the four-level branch flow channels 3015 converges into the adjacent liquid outlet converging flow channels 3016 respectively. Each liquid outlet converging flow channel 3016 is interconnected with each right plate liquid outlet 3017. The Y-shaped branch flow channel in the left plate 303 and the Y-shaped branch flow channel in the right plate 301 have the same flow channel structure, but the directions of the two Y-shaped branch flow channels are opposite. In the left plate 303, the left plate liquid inlet 3031 is interconnected with the adjacent first-level branch flow channel 3012, and each liquid outlet converging flow channel 3016 is interconnected with each left plate liquid outlet 3037.

[0027] The number of first-level branch channels 3012 is 1, the number of adjacent second-level branch channels 3013 is 2, the number of third-level branch channels 3014 adjacent to each second-level branch channel 3012 is 4, and the number of fourth-level branch channels 3015 is 12. This step-by-step increasing branch structure allows the coolant entering the right plate 301 to flow more fully in the branch channel and conduct convection heat exchange with the right plate 301 group, effectively reducing the temperature of the lower half of the right plate 301. Similarly, since the left plate 303 and the right plate 301 have the same branch channel structure, only the flow direction of the coolant is opposite, which also effectively reduces the temperature of the upper half of the left plate 303. Since the right plate 301, the middle plate 302 and the left plate 303 are fixed together to form a double-layer Y-shaped branched liquid cooling plate group, it can effectively take away the heat generated by the side battery group 10 and the heat conduction plate group 20.

[0028] Further, if Figure 7 As shown, the width of the primary branch channel 3012 is Selected in the range of 24 to 32 mm, the width of the secondary branch channel 3013 is Width is in The angle between the primary branch channel 3012 and the secondary branch channel 3013 is The width of the third-level tributary channel is in The angle between the secondary branch channel 3013 and the tertiary branch channel 3014 is The width of the fourth-level tributary channel 3015 is and Where d is selected in the range of 5 to 7 mm, and the width of the liquid converging channel 3016 is in The angle between the fourth-level branch channel 3015 and the outlet converging channel 3016 is in Select within the range of 40° to 70°.

[0029] Due to the width of the third-level tributary channel 3014 The width of the secondary tributary 3013 is As the number of flow channel stages increases, the flow channel width gradually decreases, which can ensure sufficient flow of coolant in the cold plate. The branch channel angle is selected in the range of 40° to 70°, ensuring that the pressure drop of the coolant is controlled within a reasonable range when it is diverted.

[0030] In this embodiment, If it is 24mm, we can calculate: 12mm, described d is selected as 6mm, Select 60°.

[0031] Furthermore, the thickness of the right plate 301 is selected within the range of 2.5 mm to 5.5 mm, the thickness of the middle plate 302 is selected within the range of 0.5 mm to 1.5 mm, and the thickness of the left plate 303 is selected within the range of 2.5 mm to 5.5 mm.

[0032] In this embodiment, refer to the attached Figures 3-5 The thickness of the right plate 301 is 3 mm, the thickness of the middle plate 302 is 1 mm, and the thickness of the lower plate is 3 mm.

[0033] Furthermore, both the heat conducting plate assembly 20 and the liquid cooling plate assembly 30 are made of aluminum alloy. Heat generated by the battery pack during operation is transferred from the closely adjacent heat conducting aluminum plate assembly 20 to the liquid cooling plate assemblies 30 on either side. The liquid cooling plate assemblies 30 then transfer the heat to the coolant within the assembly, where it is carried away.

[0034] The working principle of the present invention is as follows: when the present invention is working, the heat generated by the battery during operation is transferred to the double-layer Y-shaped cold plate group 30 through the heat-conducting aluminum plate 20 on the side and the battery pack 10, and then taken away by the coolant in the double-layer Y-shaped cold plate group 30. The double-layer Y-shaped bifurcated liquid cold plate group 30 is fixed together by the right plate 301, the middle plate 302 and the right plate 303. In the right plate 301, the coolant enters the first-level branch liquid flow channel 3012 through the liquid inlet 3011. The coolant in the first-level branch liquid flow channel 3012 flows into the adjacent second-level branch liquid flow channels 3013. The coolant in each third-level branch liquid flow channel 3013 flows into the adjacent fourth-level branch liquid flow channels 3014. The coolant in each fourth-level branch liquid flow channel 3015 flows into the adjacent fourth-level branch liquid flow channels 3016. 015 cooling liquid flows into the adjacent converging outlet channels 3016, and the cooling liquid in each outlet converging channel 3016 flows into the adjacent outlet ports 3017. The cooling liquid in each outlet converging channel 3016 flows out of the right plate through the outlet ports 3017, effectively reducing the temperature of the lower half of the liquid cooling plate group. Similarly, the cooling liquid in the left plate 303 enters the liquid inlet 3031 in the opposite direction from the left side of the right plate outlet 3017, flows through the first-level branch channel 3032, the second-level branch channel 3033, the third-level branch channel 3034, and the fourth-level branch channel 3035, and converges in the outlet channel 3036, thereby taking away the temperature of the upper half of the liquid cooling plate group and flowing out from the outlet port 3037 of the left plate 303.

[0035] The utility model provides a double-layer Y-shaped bifurcated flow channel liquid cold plate heat dissipation device. The coolant flow channel in the double-layer Y-shaped bifurcated cold plate adopts the letter "Y"-shaped topological flow channel structure. Under the same coolant parameter conditions, compared with the traditional flow channel structure, the double-layer Y-shaped bifurcated cold plate can effectively reduce the power consumption of the electronic water pump and effectively control the temperature difference range of the battery pack.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device, characterized by: The invention comprises a lithium battery pack (10), a heat conducting plate group (20) and a liquid cooling plate group (30), wherein the lithium battery pack (10) is composed of a plurality of single lithium batteries, the heat conducting plate group (20) is composed of a plurality of single heat conducting plates, and the liquid cooling plate group (30) is composed of two single liquid cooling plates. The single lithium batteries and the single heat conducting plates are arranged crosswise in a vertical direction, and the two liquid cooling plates are arranged on both sides of the battery pack (10) and the heat conducting plate group (20) in a transverse direction, respectively. The single liquid cooling plate comprises a right plate (301), a middle plate (302) and a left plate (303) fixed together, the right plate (301) and the left plate (303) have the same Y-shaped bifurcated flow channel and are relatively fixed on both sides of the middle plate (302), and the liquid inlet direction and liquid outlet direction of the right plate (301) and the left plate (303) are opposite.

2. The double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device according to claim 1, characterized in that: The right plate (301) is provided with a right plate liquid inlet (3011) and four right plate liquid outlets (3017), and a flow channel with a Y-shaped bifurcated structure is provided between the right plate liquid inlet (3011) and the right plate liquid outlet (3017). The left plate (303) is provided with a left plate liquid inlet (3031) and four left plate liquid outlets (3037), and a flow channel with a Y-shaped bifurcated structure is provided between the left plate liquid inlet (3031) and the left plate liquid outlet (3037). The right plate liquid inlet (3011) and the left plate liquid outlet (3037) are located at the upper end of the single liquid cooling plate, and the right plate liquid outlet (3017) and the left plate liquid inlet (3031) are located at the lower end of the single liquid cooling plate.

3. The double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device according to claim 2, characterized in that: The Y-shaped bifurcated flow channel in the right plate (301) includes one primary branch channel (3012), two secondary branch channels (3013), four tertiary branch channels (3014), twelve quaternary branch channels (3015) and four liquid outlet converging flow channels (3016). The right plate liquid inlet (3011) is interconnected with the adjacent primary branch channel (3012), the primary branch channel (3012) is interconnected with each adjacent secondary branch channel (3013), each secondary branch channel (3013) is interconnected with each adjacent tertiary branch channel (3014), each tertiary branch channel (3014) is interconnected with each adjacent quaternary branch channel (3014). The flow channels (3015) are interconnected, and each of the four-level branch flow channels (3015) converges into an adjacent liquid outlet converging flow channel (3016). Each liquid outlet converging flow channel (3016) is interconnected with each right plate liquid outlet (3017). The Y-shaped bifurcated flow channel in the left plate (303) and the Y-shaped bifurcated flow channel in the right plate (301) have the same flow channel structure, but the directions of the two Y-shaped bifurcated flow channels are opposite. In the left plate (303), the left plate liquid inlet (3031) is interconnected with the adjacent first-level branch flow channel (3012), and each liquid outlet converging flow channel (3016) is interconnected with each left plate liquid outlet (3037).

4. The double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device according to claim 3, characterized in that: The width of the primary branch channel (3012) is The width of the secondary tributary channel (3013) is in The angle between the first-level branch channel (3012) and the second-level branch channel (3013) is The width of the third-level tributary channel (3014) is in The angle between the secondary branch channel (3013) and the tertiary branch channel (3014) is The width of the fourth-level tributary channel (3015) is and The width of the liquid outlet converging channel (3016) is in The angle between the fourth-level branch channel (3015) and the outlet converging channel (3016) is in 5. The double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device according to claim 1, characterized in that: The thickness of the right plate (301) is selected within the range of 2.5 mm to 5.5 mm, the thickness of the middle plate (302) is selected within the range of 0.5 mm to 1.5 mm, and the thickness of the left plate (303) is selected within the range of 2.5 mm to 5.5 mm.

6. The double-layer Y-shaped bifurcated flow channel liquid cooling plate heat dissipation device according to claim 1, characterized in that: The heat conducting plate group (20) and the liquid cooling plate group (30) are both made of aluminum alloy.

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