A flow channel for a flat liquid cooling plate for power batteries

Abstract

A flow channel for a flat liquid cooling plate for power batteries includes a flat plate and a flow channel plate. The top surface of the flow channel plate has a groove, and the flat plate covers the groove to form a flow channel. A main inlet and a main outlet are provided at the lower left corner of the flat plate. An upper transverse flow channel group and a lower transverse flow channel group are respectively provided on the upper and lower sides of the top surface of the flow channel plate. From left to right, a first to a fourth radial flow channel group is provided between the upper and lower transverse flow channel groups. The flow channel design, which includes multiple flow channels in each flow channel group, reduces the difference in heat exchange capacity between each battery module and the liquid cooling plate. That is, it reduces the temperature difference between the cells while ensuring that the heat generated by the cells is quickly removed at a lower maximum temperature, thereby extending the battery life and ensuring the safety of the battery pack. At the same time, the reasonable flow channel design takes into account the strength of use, manufacturing feasibility, and ultimately achieves the machinability of the parts, the operability of the parts assembly, and the improvement of welding quality, ultimately achieving the functional requirements of the cooling plate.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicles, and more particularly to the liquid cooling plate technology for power batteries of new energy vehicles, and more specifically, to a flow channel for a liquid cooling plate for power batteries of new energy vehicles. Background Technology

[0002] Currently, the structure of flat-plate water-cooled plates for new energy vehicle power batteries is primarily based on the liquid cooling plate's flow channel design. This design aims to achieve temperature uniformity in the battery pack, battery drain assembly (BDU), and other related heat-generating components, preventing thermal imbalances that could lead to failure. The key to liquid cooling plates lies in their heat exchange capacity, which in turn depends on an excellent flow channel design. This design is closely related to the overall boundary conditions, and complex boundary conditions increase the design difficulty, timeframe, and workload. The flow channel design of liquid cooling plates must consider not only heat exchange capacity but also power loss and mechanical strength, making it crucial. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention provides a flow channel for a flat liquid cooling plate for a power battery, including a flat plate and a flow channel plate that cooperates with the flat plate. The top surface of the flow channel plate is provided with a groove, and the flat plate covers the groove to form a flow channel. A main water inlet and a main water outlet are provided at the lower left corner of the flat plate. An upper transverse flow channel group and a lower transverse flow channel group are respectively provided on the upper and lower sides of the top surface of the flow channel plate. A first to a fourth radial flow channel group are provided between the upper transverse flow channel group and the lower transverse flow channel group from left to right. Each flow channel group contains multiple flow channels.

[0004] The flow channels of each of the first to fourth radial flow channel groups are arranged so that each group has its own inflow and outflow. The first radial flow channel group is divided into a left region and a right region. The lower end of the flow channel contained in the left region serves as the outlet and is connected to the main outlet. The upper end of the flow channel contained in the left region serves as the inlet and is connected to the upper transverse flow channel group. The left end of the lower transverse flow channel group is connected to the main inlet. The upper end of the flow channel contained in the right region and the second to fourth radial flow channel groups serves as the outlet and is connected to the upper transverse flow channel group. The lower end of the flow channel contained in the lower region and the second to fourth radial flow channel groups serves as the inlet and is connected to the lower transverse flow channel group.

[0005] Preferably, the flow channels of the power battery flat liquid cooling plate, the flow channels included in the right region and the second to fourth radial flow channel groups, the number of water inlets connected to the lower transverse flow channel group and the number of water outlets connected to the upper transverse flow channel group are as follows: 1 water inlet and 1 water outlet, 1 water inlet and 3 water outlets, 3 water inlets and 4 water outlets, 3 water inlets and 4 water outlets.

[0006] In the preferred flow channel plate, a connecting part is provided between the connecting areas of the first to fourth radial flow channel groups, and the flow channel plate and the plate are abutted and sealed.

[0007] Preferably, the flat plate and the flow channel plate are located on the left and right sides of the first to fourth radial flow channel groups, and respectively, clearance holes are provided.

[0008] Preferably, the widths of the first to fourth radial flow channel groups are the same.

[0009] The preferred left region contains 2 inlets whose lower ends of the flow channels are connected to the main outlet.

[0010] Preferably, the cross-sectional shape and size of each flow channel are consistent.

[0011] In summary, this utility model has the following beneficial effects:

[0012] The flow channel design of this utility model reduces the difference in heat exchange capacity between each battery module and the liquid cooling plate, that is, it reduces the temperature difference between the cells while ensuring that the heat generated by the cells is quickly removed at a lower maximum temperature, thereby extending the battery life and ensuring the safety of the battery pack. At the same time, this utility model considers a reasonable flow channel design to ensure the strength of use and the feasibility of manufacturing, ultimately achieving the machinability of the parts, the operability of the parts assembly, and improving the welding quality, so as to achieve the functional requirements of the cold plate. Attached Figure Description

[0013] Figure 1 This is a diagram of the liquid cooling plate assembly of this utility model;

[0014] Figure 2 This is an exploded view of the liquid cooling plate assembly of this utility model;

[0015] Figure 3 This is a flow channel design and allocation diagram for this utility model;

[0016] Figure 4 This is a front view showing the dimensions of the flow channel design of this utility model;

[0017] Figure 5 for Figure 4 A sectional view of section AA. Detailed Implementation

[0018] The irregular shape and limitations of the boundary structure of the power battery pack for new energy vehicles, as well as the asymmetrical arrangement of the inlet and outlet, mean that the liquid cooling plate flow channel design must consider reasonable power loss while maintaining a high temperature of less than 50°C and a cell temperature uniformity of less than 5°C.

[0019] Due to the irregular shape and limitations of the boundary, flow channels cannot be arranged in certain areas of the battery module. This results in poor local heat exchange capacity. In addition, the special location of the inlet and outlet makes the structural design of the flow channels a major challenge in order to achieve effective and reliable cooling of the battery while keeping pump power loss within the design range.

[0020] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0021] refer to Figure 1 , Figure 2 The flow channel of the power battery flat liquid cooling plate of this utility model includes a flat plate 1 and a flow channel plate 2 that cooperates with the flat plate 1. The length and width of the two are the same, so that the flat plate 1 can precisely cover the flow channel plate 2. Reference Figure 3 The top surface of the flow channel 2 has a groove, which is represented by green. A flat plate 1 covers the groove to form the flow channel. A main inlet 4 and a main outlet 3 are located at the lower left corner of the flat plate 1. Upper transverse flow channel group 21 and lower transverse flow channel group 22 are respectively located on the upper and lower sides of the top surface of the flow channel plate. From left to right, first to fourth radial flow channel groups 23, 24, 25, and 26 are arranged between the upper transverse flow channel group 21 and the lower transverse flow channel group 22. Each flow channel group contains multiple flow channels; among them, the first to fourth radial flow channel groups 23, 24, 25, and 26 are irregularly shaped. Figure 3 When using a dashed rectangular frame to select areas, some areas may be under-selected or other areas may be over-selected. Those skilled in the art can understand this solution based on the present invention.

[0022] The flow channels in the first to fourth radial flow channel groups (groups 23, 24, 25, and 26) are arranged so that each channel has its own inflow and outflow. The first radial flow channel group 23 is divided into a left region and a right region; see reference [link / reference needed] for details. Figure 3 The first radial flow channel group 23 has a large water droplet in the middle. The left side of the line where the water droplet is located is the left region, and the other side is the right region. The lower end of the flow channel included in the left region serves as the outlet and the main outlet 3. Figure 3 The left side of the first radial channel group 23 is connected to the upper transverse channel group 21, and the left end of the lower transverse channel group 22 is connected to the main inlet 4. The upper end of the channels in the right region and the second to fourth radial channel groups 24, 25, and 26 are connected to the upper transverse channel group 21 as outlets, and the lower end of the channels in the lower region and the second to fourth radial channel groups 24, 25, and 26 are connected to the lower transverse channel group 22 as inlets.

[0023] The number of inlets connected to the lower transverse flow channel group 22 and the number of outlets connected to the upper transverse flow channel group 21 in the right region and the second to fourth radial flow channel groups 24, 25, and 26 are as follows: 1 inlet and 1 outlet, 1 inlet and 3 outlets, 3 inlets and 4 outlets, and 3 inlets and 4 outlets. The specific outlets and inlets are detailed in... Figure 3 The middle section uses "outlet" and "inlet" for identification. The left area contains 2 inlets whose lower ends connect to the main outlet 3.

[0024] A connecting portion 27 is provided between the connecting areas of 23, 24, 25, and 26 between the first to fourth radial flow channel groups. The flow channel plate 2 and the flat plate 1 abut against each other and are sealed. Figure 3 The gray portion is in contact with plate 1 to prevent liquid leakage.

[0025] The plate 1 and the flow channel plate 3 are located on the left and right sides of the first to fourth radial flow channel groups 23, 24, 25, and 26, respectively, and are provided with clearance holes 28. Mounting holes are also provided on both sides of the battery module. In use, the upper mounting posts of other components (such as water tanks) pass through the clearance holes to initially position the liquid cooling plate on the water tank. Then, the mounting holes on both sides of the battery module also pass through the mounting posts. That is, the mounting holes on both sides of each battery module and the clearance holes on both sides of the radial flow channel group pass through the mounting posts together, thereby attaching the battery module to the corresponding radial flow channel group to achieve fixation and heat dissipation.

[0026] In this embodiment, the widths of the first to fourth radial flow channel groups 23, 24, 25, and 26 are the same, and each flow channel group can correspond to heat dissipation of one battery module.

[0027] The design dimensions of the flow channels in this utility model have been marked. The cross-sectional shape and size of each flow channel are consistent. For details, please refer to [reference needed]. Figure 3 , 4 The values ​​in the figure are in millimeters.

[0028] The structural design principle of this utility model is as follows: the flow direction and amount of coolant are determined by the structural design of the flow channel. Therefore, the flow channel structure of this flow channel plate 3 adopts the parallel design principle. That is, the flow channel areas of the first to fourth radial flow channel groups 23, 24, 25, and 26 flow into and out of the coolant respectively. After the coolant flows in from the main inlet 4, it flows into the inlet of the flow channel area of ​​the first to fourth radial flow channel groups 23, 24, 25, and 26 respectively, and then flows out of the corresponding outlet. Then, they converge together and flow from the left area of ​​the first radial flow channel group 23 to the main outlet 3, thus forming a flow loop. The battery module is cooled by the repeated circulation of the power pump. In this design, the third and fourth radial flow channel groups 25 and 26 are located further from the main water inlet 4, while the first and second radial flow channel groups 23 and 24 are closer to the main water inlet 4. Therefore, if the third and fourth radial flow channel groups 25 and 26 were designed similarly to the first and second radial flow channel groups 23 and 24, they would not be able to obtain sufficient coolant, resulting in extreme cold and hot conditions for the battery modules. To ensure that the third and fourth radial flow channel groups 25 and 26 receive more coolant, they have more inlets than the first and second radial flow channel groups 23 and 24, thus distributing more coolant. This achieves better temperature uniformity for each module, higher heat exchange efficiency, and reduced power loss.

[0029] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A flow channel of a power battery flat plate liquid cooling plate, comprising a flat plate and a flow channel plate matched with the flat plate, characterized in that, The top surface of the flow channel plate is provided with a groove, and the flat plate covers the groove to form a flow channel. The lower left corner of the flat plate is provided with a main water inlet and a main water outlet. The upper and lower sides of the top surface of the flow channel plate are respectively provided with an upper transverse flow channel group and a lower transverse flow channel group. The first to fourth radial flow channel groups are arranged from left to right between the upper transverse flow channel group and the lower transverse flow channel group. Each flow channel group contains multiple flow channels. The flow channels of each of the first to fourth radial flow channel groups are arranged so that each group has its own inflow and outflow. The first radial flow channel group is divided into a left region and a right region. The lower end of the flow channel contained in the left region serves as the outlet and is connected to the main outlet. The upper end of the flow channel contained in the left region serves as the inlet and is connected to the upper transverse flow channel group. The left end of the lower transverse flow channel group is connected to the main inlet. The upper end of the flow channel contained in the right region and the second to fourth radial flow channel groups serves as the outlet and is connected to the upper transverse flow channel group. The lower end of the flow channel contained in the lower region and the second to fourth radial flow channel groups serves as the inlet and is connected to the lower transverse flow channel group.

2. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, The number of inlets connected to the lower transverse flow channel group and the number of outlets connected to the upper transverse flow channel group in the right region and the second to fourth radial flow channel groups are as follows: 1 inlet and 1 outlet, 1 inlet and 3 outlets, 3 inlets and 4 outlets, 3 inlets and 4 outlets.

3. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, On the flow channel plate, there is a connecting part between the connecting areas of the first to fourth radial flow channel groups, and the flow channel plate and the plate are in contact and sealed.

4. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, The flat plate and the flow channel plate are located on the left and right sides of the first to fourth radial flow channel groups, and respectively, they are provided with clearance holes.

5. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, The widths of the first to fourth radial flow channel groups are consistent.

6. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, The number of inlets connected to the main outlet at the lower end of the flow channel in the left region is 2.

7. The flow channel of the power battery flat plate liquid cooling plate according to claim 1, characterized in that, The cross-sectional shape and size of each flow channel are consistent.

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