Liquid cooling plate structure with uniform heat dissipation performance for battery pack

Abstract

A liquid cooling plate structure with uniform heat dissipation performance for a battery pack comprises a liquid cooling plate, a flow channel, a cooling medium inlet, a cooling medium outlet, a first-stroke flow channel, a second-stroke flow channel, a third-stroke flow channel, a fourth-stroke flow channel, a first turning flow channel, a second turning flow channel, a third turning flow channel, a turbulent flow element, a bionic head, a bionic tail, a horizontal supporting structure and a vertical supporting structure, a conventional liquid cooling plate adopts a uniform and symmetrical structure, and the heat absorption capacity of a cooling medium at each part of a cold plate runner is inconsistent, so that the temperature difference of a lithium battery is relatively large, but the liquid cooling plate provided by the utility model has the characteristics of improving the heat dissipation performance and obviously preventing the pressure loss of a system from being increased; the turbulence intensity of a cooling medium in a flow channel of the liquid cooling plate can be effectively improved, a thermal boundary layer is destroyed, thermal resistance is reduced, the uniform heat dissipation effect of the cooling medium in the whole process is improved, and then the uniform temperature performance of a battery system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage, and in particular relates to a liquid cooling plate structure with uniform heat dissipation performance for a battery pack. Background Art

[0002] The frequency regulation task of my country's power system is mainly undertaken by coal-fired thermal power units. Compared with hydropower and gas units, thermal power has the worst frequency regulation capability. When participating in the frequency regulation process, the thermal power units have low climbing rate and slow response speed, and they have difficulty in tracking the frequency regulation instructions, thus failing to ensure the accuracy of frequency control. In addition, traditional thermal power units will also have some adverse effects on the economy and stability of the units when performing frequency regulation tasks. This is because the frequent increase and decrease of output during frequency regulation of traditional thermal power units increases the wear of the units, and at the same time makes it difficult to control the emission of emissions, which may not meet the standards and pollute the environment; the output change of thermal power units will affect the stable operation of the combustion furnace and reduce safety.

[0003] In response to the needs of short-term energy storage and frequency modulation of thermal power units, new energy storage technologies such as lithium batteries, flywheel energy storage, and supercapacitors have developed rapidly, and the control technology has become relatively mature. Among them, lithium battery technology is the most widely used. The performance and life of the battery are closely related to temperature. If the battery temperature is too high, too low, or the temperature distribution is uneven, the battery performance will be weakened and the life will be shortened. Excessive temperature will cause side reactions, resulting in increased loss of available lithium ions and active materials. In addition, the loss of electrode active materials under high temperature conditions will cause increased polarization and a significant decrease in the diffusion coefficient; too low temperature will increase the internal resistance of the power battery, slow down the diffusion movement of lithium ions, reduce battery efficiency, and reduce discharge capacity. In severe cases, the battery cannot work normally.

[0004] At present, the technologies used in the thermal management solutions for lithium-ion batteries include air cooling technology and liquid cooling technology. Air cooling technology was applied first, and it has the advantages of simple structure, low cost, safety and reliability. However, due to the low specific heat capacity and low heat exchange efficiency of the cooling medium, the charge and discharge rate of the battery is limited. Compared with air cooling technology, liquid cooling technology has significant advantages in cooling performance and is an inevitable trend in the future development of thermal management systems. The heat generated by the battery is transferred to the liquid cooling plate by heat conduction, and then to the cooling medium. Under the action of the pump, the heated cooling medium is transported to the radiator, and then the heat generated by the battery is exported. The liquid cooling plate plays multiple roles of load bearing, heat conduction and heat exchange, and the internal structure of the liquid cooling plate will have a great impact on the flow of the fluid, thereby affecting its heat dissipation effect.

[0005] Traditional liquid cooling plates all adopt a uniform and symmetrical structure. When the cooling medium just enters the liquid cooling plate flow channel, the temperature is low and the heat absorption is large. When the cooling medium flows to the end of the cold plate flow channel, the temperature is high and the heat absorption is small. The heat absorption of the cooling medium in different parts of the cold plate flow channel is inconsistent, resulting in a large temperature difference in the lithium battery. The utility model provides a liquid cooling plate structure with uniform heat dissipation performance for the battery pack. By embedding a spoiler element with a bionic structure in the liquid cooling plate flow channel structure design, it improves the uniform heat dissipation performance while preventing a significant increase in system pressure loss. Summary of the invention

[0006] The purpose of the utility model is to provide a liquid cooling plate structure with uniform heat dissipation performance for a battery pack, which has the characteristics of improving the heat dissipation performance and preventing a significant increase in system pressure loss. It can effectively increase the turbulence intensity of the cooling medium in the liquid cooling plate flow channel, destroy the thermal boundary layer, and improve the uniform heat dissipation effect of the cooling medium in the entire process, thereby improving the temperature uniformity performance of the battery system.

[0007] To solve the above problems, the utility model adopts the following technical solutions: a liquid cooling plate structure with uniform heat dissipation performance of a battery pack, comprising a liquid cooling plate, a flow channel, a cooling medium inlet, a cooling medium outlet, a first-pass flow channel, a second-pass flow channel, a third-pass flow channel, a fourth-pass flow channel, a first turning flow channel, a second turning flow channel, a third turning flow channel, a spoiler element, a bionic head, a bionic tail, a horizontal support structure, and a vertical support structure. The liquid cooling plate is arranged at the bottom, middle, top, or a combination of the three positions of the battery pack. The cooling medium inlet and the cooling medium outlet are on the same side of the liquid cooling plate, which is beneficial to the heat dissipation performance and system assembly of the system. No spoiler element is set in the first-pass flow channel, and the number of spoiler elements gradually increases with the increase of the number of flow channel passes. The spoiler element is a hollow structure with a horizontal support structure and a vertical support structure inside. The bionic head of the spoiler element always faces the incoming flow direction of the cooling medium, and the bionic tail of the spoiler element faces away from the incoming flow direction of the cooling medium.

[0008] The maximum temperature difference of the battery pack mainly occurs between different battery cells. Because the flow parameters of the cooling medium in the liquid cooling plate flow channel are different, the thermodynamic parameters of the cooling medium are different, resulting in different heat dissipation effects at different positions of the liquid cooling plate flow channel. The battery temperature near the coolant inlet is the lowest, and the battery temperature near the coolant outlet is the highest. Therefore, arranging spoiler elements in the flow channel can effectively improve the heat dissipation performance and the temperature uniformity of the battery pack. The essence of this method is to arrange spoiler elements at local positions of the flow channel to form local spoilers. The cooling medium is reasonably disturbed, diverted, and converged, the turbulence intensity is enhanced, the thermal boundary layer is destroyed, the thermal resistance is reduced, the heat exchange effect is improved, and the heat dissipation performance is improved.

[0009] Compared with the prior art, the liquid cooling plate structure disclosed in the utility model has the characteristics of improving the heat dissipation performance and preventing the system pressure loss from increasing significantly. It can effectively increase the turbulence intensity of the cooling medium in the liquid cooling plate flow channel, destroy the thermal boundary layer, reduce thermal resistance, and improve the uniform heat dissipation effect of the cooling medium in the entire process, thereby improving the temperature uniformity performance of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The invention will be explained in more detail below with the aid of the accompanying drawings, wherein the same reference numerals denote the same elements.

[0011] Figure 1 It is a schematic diagram of the overall layout of the liquid cooling plate structure showing the uniform heat dissipation performance of a battery pack.

[0012] Figure 2 It is a detailed diagram of a spoiler element in a liquid cooling plate structure showing uniform heat dissipation performance of a battery pack.

[0013] In the above figures, 1 is a liquid cooling plate, 2 is a flow channel, 3 is a cooling medium inlet, 4 is a cooling medium outlet, 5 is a first-pass flow channel, 6 is a second-pass flow channel, 7 is a third-pass flow channel, 8 is a fourth-pass flow channel, 9 is a first turning flow channel, 10 is a second turning flow channel, 11 is a third turning flow channel, 12 is a spoiler element, 13 is a bionic head, 14 is a bionic tail, 15 is a horizontal support structure, and 16 is a vertical support structure. Implementation

[0014] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. In the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. It should be noted that other technicians in the technical field can modify or change the present invention without departing from the principle of the present invention, but these modifications or changes also fall within the scope of protection of the claims of the present invention.

[0015] like Figure 1As shown, the traditional liquid cooling plate is arranged at the bottom of the battery pack. In order to improve the overall heat dissipation performance and temperature uniformity performance of the battery pack, the specific liquid cooling plate arrangement scheme is a combination of the bottom, middle, top or three positions; the cooling medium outlet and the cooling medium inlet are on the same side of the liquid cooling plate, which is beneficial to the heat dissipation performance and system assembly of the system; the cooling medium enters the first-pass flow channel from the cooling medium inlet, and the first-pass flow channel is not arranged with a spoiler element, and then passes through the first turning flow channel, enters the second-pass flow channel, passes through the spoiler element of the second-pass flow channel, and then passes through the second turning flow channel, enters the third-pass flow channel, passes through the spoiler element of the third-pass flow channel, and then passes through the third turning flow channel, enters the fourth-pass flow channel, and then flows out from the cooling medium outlet. The number of flow channels is 4, and the number of flow channels in the specific implementation process is N, N≥4, and the number of flow channels without spoilers is N / 2-1, and as the number of channels increases, the number of spoilers increases.

[0016] like Figure 2 As shown, the spoiler is a hollow structure with a horizontal support structure and a vertical support structure inside. The spoiler is symmetrical along the horizontal support structure, and the horizontal support structure of the spoiler coincides with the center of the flow channel. The width of the spoiler is less than half of the flow channel diameter. The length of the spoiler is divided into two parts: the length of the bionic head and the length of the bionic tail. The length of the bionic tail is 1.3 to 2.5 times the length of the bionic head.

[0017] The bionic head of the spoiler element always faces the flow direction of the cooling medium, and the bionic tail of the spoiler element faces away from the flow direction of the cooling medium. When the cooling medium passes through the bionic head of the spoiler element, the flow line shape changes, and secondary flow channels are generated on both sides of the spoiler element. The flow velocity in the secondary flow channel increases, Re increases, the turbulence intensity is enhanced, the thermal boundary layer is destroyed, the thermal resistance is reduced, and the heat dissipation performance is improved. After the cooling medium passes through the bionic tail, the cooling medium in the secondary flow channel converges. Because the equivalent diameter of the bionic tail is small, no large-scale vortex will be generated downstream of the spoiler element, preventing the system pressure loss from increasing significantly.

[0018] Although typical embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications or changes can be made within the scope of the claims.

Claims

1. A liquid cooling plate structure with uniform heat dissipation performance for a battery pack, characterized in that: It includes a liquid cooling plate, a flow channel, a cooling medium inlet, a cooling medium outlet, a first-pass flow channel, a second-pass flow channel, a third-pass flow channel, a fourth-pass flow channel, a first turning flow channel, a second turning flow channel, a third turning flow channel, a spoiler element, a bionic head, a bionic tail, a horizontal support structure, and a vertical support structure. The liquid cooling plate is arranged at the bottom, the middle, the top, or a combination of the three positions. The cooling medium outlet and the cooling medium inlet are on the same side of the liquid cooling plate. The cooling medium enters the first-pass flow channel from the cooling medium inlet, passes through the first turning flow channel, enters the second-pass flow channel, passes through the spoiler element of the second-pass flow channel, passes through the second turning flow channel, enters the third-pass flow channel, passes through the spoiler element of the third-pass flow channel, passes through the third turning flow channel, enters the fourth-pass flow channel, and then flows out from the cooling medium outlet.

2. A liquid cooling plate structure with uniform heat dissipation performance for a battery pack according to claim 1, characterized in that: The bionic head of the spoiler element always faces the flow direction of the cooling medium, and the bionic tail of the spoiler element faces away from the flow direction of the cooling medium.

3. The liquid cooling plate structure with uniform heat dissipation performance of a battery pack according to claim 1, characterized in that: The number of flow channel paths is N, N≥4, the number of flow channel paths without spoiler elements is N / 2-1, and as the number of paths increases, the number of spoiler elements increases.

4. The liquid cooling plate structure with uniform heat dissipation performance of a battery pack according to claim 1, characterized in that: The spoiler element is a hollow structure with a horizontal support structure and a vertical support structure inside. The spoiler element is a front-to-back symmetrical structure along the horizontal support structure, and the horizontal support structure of the spoiler element coincides with the center of the flow channel.

5. The liquid cooling plate structure with uniform heat dissipation performance of a battery pack according to claim 1, characterized in that: The width of the spoiler element is less than half of the diameter of the flow channel. The length of the spoiler element is divided into two parts: the length of the bionic head and the length of the bionic tail. The length of the bionic tail is 1.3 to 2.5 times the length of the bionic head.

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