Flow equalizing liquid cooling plate

Abstract

The invention relates to a flow-equalizing liquid cooling plate which comprises a liquid cooling plate main body, the liquid cooling plate main body comprises a liquid inlet, a plurality of flow-equalizing shunting areas and a liquid outlet which are communicated in sequence, the flow-equalizing shunting areas are communicated in series in sequence, and the two ends of each flow-equalizing shunting area are respectively a liquid inlet shunting area and a liquid outlet gathering area; a plurality of parallel dividing plates are arranged between the liquid inlet dividing area and the liquid outlet collecting area in the length direction of each flow equalizing dividing area, and dividing channels are formed between the dividing plates; a flow equalizer is arranged at the end, close to the liquid inlet, of each channel dividing plate in the flow equalizing and dividing area directly communicated with the liquid inlet, the distance between the liquid inlet and the flow equalizer is larger than 25 mm, and the flow equalizer is provided with flow channel openings corresponding to the branch channels one to one and used for limiting the flow of fluid entering the branch channels. The width of each flow channel opening is calculated according to the following formula: Q / N = CAi * (delta Pi / rho) 1 / 2, (I); ai = abi, (II); [Delta] Pi = P1i-P2i, (III). The flow equalizing liquid cooling plate is reasonable in internal structure arrangement and has excellent flow guide, flow division and pressure division effects.

Description

Technical Field

[0001] The present invention belongs to the field of liquid cooling and heat dissipation, and in particular relates to a flow-equalizing liquid cooling plate. Background Art

[0002] The aluminum extruded liquid cooling plates currently on the market have uneven flow rates, resulting in uneven heating and cooling of the bottom of the battery cells during heating or cooling, leading to large temperature differences between the battery cells and excessive flow resistance. To address the problem of uneven flow rates within the liquid cooling plate, Chinese patent CN109149008A discloses a liquid cooling plate with an integrated thermal insulation layer, comprising a liquid cooling plate body, a thermal insulation layer provided on the lower end face of the liquid cooling plate body, a liquid outlet plate provided at one end thereof, a liquid outlet pipe provided on the liquid outlet plate, and a liquid inlet plate provided at the other end thereof, a liquid inlet pipe provided on the liquid inlet plate. The heat-insulating layer of the present invention is directly solidified and formed on the surface of the liquid cooling plate, which reduces the heat loss of the non-working surface of the liquid cooling plate, improves the heat dissipation efficiency and capacity, and reduces the number of processes in the assembly plant, thereby improving efficiency and reducing costs. It can evenly distribute the internal cooling liquid to ensure that the heat dissipation effect of the liquid cooling plate body is more uniform and reliable. An auxiliary flow channel is set below the main flow channel, which can increase the flow rate and flow rate, improve the heat dissipation speed and efficiency, and increase the heat dissipation area, and increase the heat exchange amount of the liquid per unit area. Chinese patent CN109830778A discloses a temperature-equalizing liquid cooling plate with adjustable heat exchange intensity, which belongs to the field of thermal management and involves the cooling of power electronic equipment such as power battery thermal management and IGBT. It includes a cover plate 7 and a flow channel substrate 8, wherein the flow channel substrate 8 adopts a flow channel structure design with adjustable heat exchange intensity along the flow channel, and has fluid inlets and outlets on both sides of the narrow end, which are divided into an even flow area 2, an adjustable heat exchange area 3, and a confluence area 4. The fins in the adjustable heat exchange zone 3 are variable in size and arranged in increasing density along the direction of fluid flow. By changing the flow channel structure, the flow velocity and heat exchange surface area in the second half of the flow channel are increased, thereby gradually improving the heat exchange intensity along the flow direction. By optimizing the flow channel structure of the liquid cooling plate, this invention avoids the problem of heat accumulation in the fluid during the heat exchange process and the reduction of the heat exchange temperature difference, which causes the heat exchange effect to decrease. This reduces the coolant flow rate and the cost of the liquid cooling system, while also solving the problem of temperature uniformity and high efficiency of the liquid cooling plate heat exchange. Summary of the Invention

[0003] Based on the above, the purpose of the present invention is to propose a uniform flow liquid cooling plate to solve the technical problem of poor heat dissipation / heating effect of the existing liquid cooling plate. The structural arrangement of each area and each flow channel inside the uniform flow liquid cooling plate provided by the present invention is reasonable, and has excellent flow guidance, diversion and pressure division effects.

[0004] To this end, the present invention provides a flow-balanced liquid cold plate, comprising a liquid cold plate body, wherein the liquid cold plate body comprises a liquid inlet, a plurality of flow-balanced diversion areas, and a liquid outlet, which are sequentially connected, wherein the flow-balanced diversion areas are sequentially connected in series, and the two ends of each flow-balanced diversion area are respectively a liquid inlet diversion area and a liquid outlet collection area, and a plurality of parallel diversion plates are provided between the liquid inlet diversion area and the liquid outlet collection area along the length direction of each flow-balanced diversion area, and a diversion channel is provided between each diversion plate;

[0005] A flow equalizer is provided at one end of each branch plate in the flow equalization and diversion area directly connected to the liquid inlet, close to the liquid inlet. The distance between the liquid inlet and the flow equalizer is greater than 25 mm. The flow equalizer is provided with flow channel openings corresponding to each branch channel one by one, for limiting the flow rate of the fluid entering each branch channel. The width of each flow channel opening is calculated according to the following formula:

[0006] Q / N=CA i *(ΔP i / ρ)^1 / 2, (I);

[0007] A i =ab i , (II);

[0008] ΔP i =P1 i -P2 i , (III);

[0009] Where Q is the total flow rate of the fluid passing through the flow equalizer, C is the flow coefficient of the flow equalizer, 1.1≤C≤1.2, A i is the area of the corresponding flow channel, ΔP i is the pressure difference between the two ends of the flow channel when the fluid flows through the equalizer, ρ is the fluid density; a is the height of each flow channel, and the height of each flow channel is the same, b i is the width of each flow channel, i is the number of the flow channel, and each flow channel is numbered from one side of the liquid cooling plate body to the other side, i = 1, ... N, N is the number of flow channels in each flow distribution area, N ≤ 10; P1 i is the pressure of the fluid flowing through the front face of the flow channel, P2 i It is the pressure when the fluid at the flow channel flows through the rear end face.

[0010] In some embodiments, the distance between the liquid inlet and the flow equalizer is greater than 25 mm and less than 50 mm.

[0011] In some embodiments, the flow balancing and diversion areas are arranged in parallel, and the fluid flow directions between adjacent flow balancing and diversion areas are opposite.

[0012] In some embodiments, the number of the flow balancing and diversion regions is 2 to 6, preferably 4.

[0013] In some embodiments, the number of diversion channels in each flow balancing and diversion area is the same.

[0014] In some embodiments, the ratio of the length to the width of each flow balancing and diversion area is 1.5-4:1, preferably 2:1.

[0015] In some embodiments, the width of each liquid inlet diversion area is the same as the width of each flow-averaging diversion area, and the ratio of the length to the width of each liquid inlet diversion area is 1.5-4:1, preferably 2:1.

[0016] In some embodiments, the width of each liquid outlet collection area is the same as the width of each flow equalization and diversion area, and the ratio of the length to the width of each liquid outlet collection area is 1.5-4:1, preferably 2:1.

[0017] In some embodiments, the lengths and widths of the flow diversion channels in each flow-averaging and diversion area are the same or different.

[0018] In some embodiments, the several equal flow diversion areas include a first equal flow diversion area, a second equal flow diversion area, a third equal flow diversion area and a fourth equal flow diversion area. The two ends of the first equal flow diversion area are respectively the first liquid inlet diversion area and the first liquid outlet collection area. The two ends of the fourth equal flow diversion area are respectively the fourth liquid inlet diversion area and the fourth liquid outlet collection area. The liquid inlet is connected to the first liquid inlet diversion area, and the liquid outlet is connected to the fourth liquid outlet collection area.

[0019] In some embodiments, the liquid outlet collection area of a flow balancing and diversion area and the liquid inlet diversion area of an adjacent downstream flow balancing and diversion area are located on the same side of the flow balancing and diversion cold plate and are in communication with each other.

[0020] In some embodiments, the two ends of the second flow-equalizing diversion area are respectively the second liquid inlet diversion area and the second liquid outlet collection area, the two ends of the third flow-equalizing diversion area are respectively the third liquid inlet diversion area and the third liquid outlet collection area, the first liquid outlet collection area is connected to the second liquid inlet diversion area, the second liquid outlet collection area is connected to the third liquid inlet diversion area, and the third liquid outlet collection area is connected to the fourth liquid inlet diversion area.

[0021] The beneficial effects of the present invention are: The structure of each area and each flow channel inside the flow-distributing liquid cooling plate provided by the present invention is reasonable. Figure 4 It can be seen that it has excellent flow guidance, diversion and pressure division effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings:

[0023] Figure 1The figure is a schematic diagram of the appearance of the flow-distributing liquid cooling plate provided according to the present invention.

[0024] Figure 2 Schematic diagram of the internal structure of the flow-distributing liquid cooling plate provided according to the present invention.

[0025] Figure 3 Schematic diagram of the internal structure of the flow-distributing liquid cooling plate provided according to the present invention.

[0026] Figure 4 This is a diagram showing simulation results of the fluid flow in the internal channel of the uniform flow liquid cooling plate provided in Example 1 of the present invention.

[0027] In the drawings, like components are given like reference numerals, and the drawings are not drawn to scale.

[0028] Among them, 1. liquid cooling plate main body, 2. liquid inlet, 3. liquid outlet, 4. first equalizing flow diversion area, 5. second equalizing flow diversion, 6. third equalizing flow diversion area, 7. fourth equalizing flow diversion area, 8. channel plate, 9. diversion channel; 10. first liquid inlet diversion area, 11. first liquid outlet collection area, 12. second liquid inlet diversion area, 13. second liquid outlet collection area, 14. third liquid inlet diversion area, 15. third liquid outlet collection area, 16. fourth liquid inlet diversion area, 17. fourth liquid outlet collection area, 18. flow equalizer, 19. flow channel outlet. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present invention, and to fully understand and implement the process of how the present invention applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. The embodiments of the present invention and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] like Figure 1-4 As shown, a uniform flow liquid cooling plate includes a liquid cooling plate body 1, and the liquid cooling plate body 1 includes a liquid inlet 2, a first uniform flow diversion area 4, a second uniform flow diversion area 5, a third uniform flow diversion area 6, a fourth uniform flow diversion area 7 and a liquid outlet 3 connected in sequence, each uniform flow diversion area is connected in series in sequence, and the two ends of each uniform flow diversion area are a liquid inlet diversion area and a liquid outlet collection area. A number of parallel branch plates 8 are provided between the liquid inlet diversion area and the liquid outlet collection area along the length direction of each uniform flow diversion area, and there are branch channels 9 between each branch plate; each uniform flow diversion area is arranged in parallel, and the fluid flow directions between adjacent uniform flow diversion areas are opposite.

[0033] A flow equalizer 18 is provided at one end of each branch plate 8 near the liquid inlet 2 in the first flow-equalizing and diverting area 4. The distance between the liquid inlet 2 and the flow equalizer 18 is greater than 25 mm. The flow equalizer 18 includes a plurality of flow channel openings 19 corresponding to each branch channel 9, which are used to limit the flow rate of the fluid entering each branch channel 9. The width of each flow channel opening 19 is calculated according to the following formula:

[0034] Q / N=CA i *(ΔP i / ρ)^1 / 2, (I);

[0035] A i =ab i , (II);

[0036] ΔP i =P1 i -P2 i , (III);

[0037] Where Q is the total flow rate of the fluid passing through the flow equalizer 18, C is the flow coefficient of the flow equalizer 18, 1.1≤C≤1.2, A i is the area of the corresponding flow channel 19, a is the height of each flow channel 19, and the height of each flow channel 19 is the same, b i is the width of each flow channel 19, i is the number of the flow channel 19, and each flow channel 19 is numbered from one side of the liquid cooling plate body to the other side, i=1,...N, N is the number of flow channels 19 in each flow distribution area, N≤10, ΔP i is the pressure difference between the front and rear ends of the flow channel fluid flowing through the equalizer 18, P1 i is the pressure of the fluid flowing through the front face of the flow channel, P2 i It is the pressure when the fluid at the flow channel flows through the rear end face.

[0038] Among them, the two ends of the first equal flow diversion area 4 are the first liquid inlet diversion area 10 and the first liquid outlet collection area 11 respectively, the two ends of the second equal flow diversion area 5 are the second liquid inlet diversion area 12 and the second liquid outlet collection area 13 respectively, the two ends of the third equal flow diversion area 6 are the third liquid inlet diversion area 14 and the third liquid outlet collection area 15 respectively, and the two ends of the fourth equal flow diversion area 7 are the fourth liquid inlet diversion area 16 and the fourth liquid outlet collection area 17 respectively, the liquid inlet 2 is connected to the first liquid inlet diversion area 10, the first liquid outlet collection area 11 is connected to the second liquid inlet diversion area 12, the second liquid outlet collection area 13 is connected to the third liquid inlet diversion area 14, the third liquid outlet collection area 16 is connected to the fourth liquid inlet diversion area 16, and the fourth liquid outlet collection area 17 is connected to the liquid outlet 3.

[0039] Among them, the number of diversion channels 9 in each equal flow diversion area is the same, the ratio of the length to the width of each equal flow diversion area is 1.5-4:1, the width of each liquid inlet diversion area is the same as the width of each equal flow diversion area, the ratio of the length to the width of each liquid inlet diversion area is 1.5-4:1, the width of each liquid outlet collection area is the same as the width of each equal flow diversion area, the ratio of the length to the width of each liquid outlet collection area is 1.5-4:1, and the length and width of each diversion channel 9 in each equal flow diversion area are the same or different.

[0040] Example 1

[0041] The flow-averaging liquid cooling plate provided in this embodiment includes a liquid cooling plate body 1, and the liquid cooling plate body 1 includes a liquid inlet 2, a first flow-averaging diversion area 4, a second flow-averaging diversion area 5, a third flow-averaging diversion area 6, a fourth flow-averaging diversion area 7 and a liquid outlet 3 connected in sequence. The two ends of each flow-averaging diversion area are a liquid inlet diversion area and a liquid outlet collection area. A number of parallel branch plates 8 are provided between the liquid inlet diversion area and the liquid outlet collection area along the length direction of each flow-averaging diversion area, and branch channels 9 are provided between each branch plate. The fluid flow directions between adjacent flow-averaging diversion areas are opposite, and the fluid flow directions in each branch channel 9 in the same flow-averaging diversion area are the same.

[0042] A flow equalizer 18 is provided at one end of each branch plate 8 near the liquid inlet 2 in the first flow-equalizing and diverting area 4. The distance between the liquid inlet 2 and the flow equalizer 18 is 30 mm. The flow equalizer 18 includes a plurality of flow channel openings 19 corresponding to each branch channel 9, which are used to limit the flow rate of the fluid entering each branch channel 9. The width of each flow channel opening 19 is calculated according to the following formula:

[0043] Q / N=CA i *(ΔP i / ρ)^1 / 2,(I)

[0044] A i =ab i , (II)

[0045] ΔP i =P1 i -P2 i , (III)

[0046] Where Q is the total flow rate of the fluid passing through the flow equalizer 18, C is the flow coefficient of the flow equalizer 18, 1.1≤C≤1.2, A i is the area of the corresponding flow channel 19, a is the height of each flow channel 19, and the height of each flow channel 19 is the same, b i is the width of each flow channel 19, i is the number of the flow channel 19, and each flow channel 19 is numbered from one side of the liquid cooling plate body to the other side, i=1,...N, N is the number of flow channels 19 in each flow distribution area, N=5, ΔP i is the pressure difference between the front and rear ends of the flow channel fluid flowing through the equalizer 18, P1 i is the pressure of the fluid flowing through the front face of the flow channel, P2 i It is the pressure when the fluid at the flow channel flows through the rear end face.

[0047] Among them, the number of diversion channels 9 in each equal flow diversion area is the same, which is 5. The ratio of the length to the width of each equal flow diversion area is 2:1. The width of each liquid inlet diversion area is the same as the width of each equal flow diversion area. The ratio of the length to the width of each liquid inlet diversion area is 2:1. The width of each liquid outlet collection area is the same as the width of each equal flow diversion area. The ratio of the length to the width of each liquid outlet collection area is 2:1.

[0048] The specific calculation process of a certain flow channel x is as follows:

[0049] Known: P1 X =700Pa, P2 x =100Pa,ΔP x =600Pa,

[0050] Then from Q = 0.000084m3 / s, C = 1.1, the fluid used in this embodiment is 50wt% ethylene glycol aqueous solution, and the density ρ is 1072kg / m 3 , calculated by formula (I), A=0.0000936m 2 ,

[0051] In this embodiment, the heights of the flow passages 19 are the same, a=0.007m=7mm,

[0052] In order to ensure the flow rate of each flow channel is consistent, different ΔP i Calculated from this: b1 = 11 mm, b2 = 12 mm, b3 = 12.8 mm, b4 = 13.2 mm, b5 = 14.5 mm.

[0053] According to the calculation results of Example 1, the width b of each flow channel opening 19 in the flow equalizer 18 is set. i The simulation result of the fluid flow in the internal channel of the uniform flow liquid cold plate of Example 1 is as follows: Figure 4 .like Figure 4 As shown, the structures of the internal regions and flow channels of the flow-uniform liquid cooling plate provided by the present invention are reasonably arranged, and have excellent flow guidance, flow division and pressure division effects.

[0054] The above descriptions are merely some preferred embodiments of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present invention.

Claims

1. A flow-distributing liquid cooling plate, comprising a liquid cooling plate body, characterized in that: The liquid cooling plate body includes a liquid inlet, a plurality of equal flow diversion areas and a liquid outlet that are connected in sequence, each of the equal flow diversion areas is connected in series in sequence, and the two ends of each equal flow diversion area are respectively a liquid inlet diversion area and a liquid outlet collection area, and a plurality of parallel diversion plates are provided between the liquid inlet diversion area and the liquid outlet collection area along the length direction of each equal flow diversion area, and a diversion channel is provided between each diversion plate; A flow equalizer is provided at one end of each branch plate in the flow equalization and diversion area directly connected to the liquid inlet, close to the liquid inlet. The distance between the liquid inlet and the flow equalizer is greater than 25 mm. The flow equalizer is provided with flow channel openings corresponding to each branch channel one by one, for limiting the flow rate of the fluid entering each branch channel. The width of each flow channel opening is calculated according to the following formula: Q / N=CA i *(ΔP i / ρ)^1 / 2,(I); AT i =ab i ,(II); ΔP i =P1 i -P2 i ,(III); Where Q is the total flow rate of the fluid passing through the flow equalizer, C is the flow coefficient of the flow equalizer, 1.1≤C≤1.2, A i is the area of the corresponding flow channel, ΔP i is the pressure difference between the two ends of the flow channel when the fluid flows through the equalizer, ρ is the fluid density; a is the height of each flow channel, and the height of each flow channel is the same, b i is the width of each flow channel, i is the number of the flow channel, and each flow channel is numbered from one side of the liquid cooling plate body to the other side, i = 1, ... N, N is the number of flow channels in each flow distribution area, N ≤ 10; P1 i P is the pressure when the fluid flows through the front end face of the flow channel, and P2 is the pressure when the fluid flows through the rear end face of the flow channel.

2. The flow-distributing liquid cold plate according to claim 1, characterized in that: The distance between the liquid inlet and the flow equalizer is greater than 25 mm and less than 50 mm.

3. The flow-distributing liquid cooling plate according to claim 1 or 2, characterized in that: The flow balancing and diversion areas are arranged in parallel, and the fluid flow directions between adjacent flow balancing and diversion areas are opposite; and / or the number of the flow balancing and diversion areas is 2 to 6.

4. The flow-distributing liquid cooling plate according to any one of claims 1 to 3, characterized in that: The number of the flow diversion channels in each flow equalization and diversion area is the same.

5. The flow-distributing liquid cooling plate according to any one of claims 1 to 4, characterized in that: The ratio of the length to the width of each flow balancing and diversion area is 1.5-4:

1.

6. The flow-distributing liquid cooling plate according to any one of claims 1 to 5, characterized in that: The width of each liquid inlet diversion area is the same as the width of each flow-averaging diversion area, and the ratio of the length to the width of each liquid inlet diversion area is 1.5-4:

1.

7. The flow-distributing liquid cooling plate according to any one of claims 1 to 6, characterized in that: The width of each liquid outlet collection area is the same as the width of each flow equalization and diversion area, and the ratio of the length to the width of each liquid outlet collection area is 1.5-4:

1.

8. The flow-distributing liquid cooling plate according to any one of claims 1 to 7, characterized in that: The lengths and widths of the flow diversion channels in the flow-averaging and diversion areas are the same or different.

9. The flow-distributing liquid cooling plate according to any one of claims 1 to 8, characterized in that: The several equal flow diversion areas include a first equal flow diversion area, a second equal flow diversion area, a third equal flow diversion area and a fourth equal flow diversion area. The two ends of the first equal flow diversion area are respectively the first liquid inlet diversion area and the first liquid outlet collection area. The two ends of the fourth equal flow diversion area are respectively the fourth liquid inlet diversion area and the fourth liquid outlet collection area. The liquid inlet is connected to the first liquid inlet diversion area, and the liquid outlet is connected to the fourth liquid outlet collection area.

10. The flow-distributing liquid cooling plate according to claim 9, characterized in that: The liquid outlet collection area of an equal flow diversion area and the liquid inlet diversion area of its adjacent downstream equal flow diversion area are located on the same side of the equal flow liquid cold plate and are connected; preferably, the two ends of the second equal flow diversion area are respectively the second liquid inlet diversion area and the second liquid outlet collection area, the two ends of the third equal flow diversion area are respectively the third liquid inlet diversion area and the third liquid outlet collection area, the first liquid outlet collection area is connected to the second liquid inlet diversion area, the second liquid outlet collection area is connected to the third liquid inlet diversion area, and the third liquid outlet collection area is connected to the fourth liquid inlet diversion area.

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