A top and bottom double-sided cooling liquid cooling assembly

Abstract

The utility model relates to battery pack cooling device technical field especially relates to a top and bottom double -faced cooling liquid cooling assembly. The utility model discloses two same liquid cooling panels that have the base plate and the flow channel board, two base plates are in contact with the top and bottom surface of battery pack respectively, is provided with flow channel import and flow channel export on the base plate, is provided with the cooling channel for the flow of cooling medium on the flow channel board, and the cooling channel includes: a plurality of far import S type branch flow and a plurality of near import S type branch flow, and the near import S type branch flow is more close to flow channel import than the far import S type branch flow, and flow channel import and flow channel export all deviate the center line of liquid cooling panel, and the length of near import S type branch flow is greater than the far import S type branch flow, so that the flow resistance of near import S type branch flow and far import S type branch flow is equal, so under the condition of asymmetric cooling channel, battery pack can also be uniformly and efficiently radiated.

Description

Technical Field

[0001] This utility model relates to the technical field of battery pack cooling devices, and in particular to a top and bottom double-sided cooling liquid cooling assembly. Background Technology

[0002] As the power supply component of new energy electric vehicles, the battery pack experiences a temperature rise during charging and discharging, especially during fast charging. When the battery pack temperature reaches a certain level, it needs to be cooled. The main existing cooling method is to use liquid cooling plates. However, since the temperature in the middle part of the battery pack is often higher than other parts, existing liquid cooling plates typically supply cooling medium through an inlet on the center line of the liquid cooling plate. The cooling medium passes through cooling channels symmetrically along the center line of the liquid cooling plate and then exits through an outlet on the center line of the liquid cooling plate, so that the cooling medium passes through the cooling channels evenly and dissipates heat evenly from the battery pack.

[0003] To effectively utilize installation space, the inlet and outlet of a liquid cooling plate are typically located between two liquid cooling plates. However, when the battery pack is thin or the gap between the two liquid cooling plates is small, the opposite inlets or outlets on the two liquid cooling plates can easily interfere with each other. This requires at least an additional bend to connect the cooling medium supply and recovery ends, resulting in a waste of installation space. Directly offsetting the positions of the inlet and outlet on the liquid cooling plate will lead to a large difference in flow resistance within the cooling channel, resulting in uneven flow of the cooling medium and low cooling efficiency for the battery pack. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, the purpose of this utility model is to propose a top and bottom double-sided cooling liquid cooling assembly, which solves the problem that existing liquid cooling plates cannot make full use of the limited installation space between liquid cooling plates without affecting the cooling efficiency of the battery pack.

[0005] A top-bottom double-sided cooling liquid cooling assembly includes two identical liquid cooling plates consisting of a base plate and a flow channel plate. The two base plates are in contact with the top and bottom surfaces of a battery pack, respectively. The base plates are provided with flow channel inlets and outlets. Cooling channels for the flow of cooling medium are provided on the base plates and the flow channel plates. The cooling channels include: a plurality of far-inlet S-shaped branches and a plurality of near-inlet S-shaped branches. The flow channel inlets and outlets serve as the input and output ends of the cooling medium, respectively. The near-inlet S-shaped branches are closer to the flow channel inlets than the far-inlet S-shaped branches. Both the flow channel inlets and outlets are offset from the centerline of the liquid cooling plate. The stroke of the near-inlet S-shaped branches is greater than that of the far-inlet S-shaped branches, so that the flow resistance of the near-inlet S-shaped branches is equal to that of the far-inlet S-shaped branches.

[0006] Preferably, the flow channel inlets and outlets on the two substrates are horizontally offset from each other, and there is a gap between the two substrates for placing the cooling medium supply end and recovery end installed at the flow channel inlet and outlet.

[0007] Preferably, the cooling channel further includes: a return channel, the outlet of which is connected to the return channel, and the inlet of which is connected to the return channel via a far-inlet S-shaped branch and a near-inlet S-shaped branch.

[0008] Preferably, the cooling channel further includes two straight-line branches, and the inlet and return channel are connected by two straight-line branches. The straight-line branches, the far-inlet S-shaped branches, and the near-inlet S-shaped branches are connected in parallel.

[0009] Preferably, the top and bottom double-sided cooling liquid cooling assembly also includes a thermal pad, and the substrate contacts the battery pack through the thermal pad.

[0010] Preferably, both the substrate and the flow channel plate are provided with several explosion-proof valve openings with corresponding positions.

[0011] Preferably, the far-inlet S-shaped tributary is zigzag-shaped, forming two bends along the flow direction, and the near-inlet S-shaped tributary is zigzag-shaped, forming two bends along the flow direction.

[0012] Preferably, the battery pack is located between two bends of the far-inlet S-shaped tributary and between two bends of the near-inlet S-shaped tributary.

[0013] Preferably, the linear branch is located at the edge of the battery pack.

[0014] Beneficial effects: 1. The high heat generated by the battery pack under fast charging conditions is transferred through the substrate, flow channel plate and cooling medium. The cooling medium cools the battery pack during the flow process. The two liquid cooling plates cool the top and bottom surfaces of the battery pack respectively. This can reduce the maximum temperature rise of the battery pack under fast charging conditions, reduce the temperature difference of the bottom surface of the battery pack, improve the temperature uniformity of the battery pack, and effectively improve the service life of the battery pack.

[0015] 2. The flow channel inlets and outlets on the two substrates are horizontally offset by a certain distance, so that the opposite flow channel inlets on the two substrates will not interfere with each other, and the opposite flow channel outlets on the two substrates will not interfere with each other. There is a gap between the two substrates for placing the cooling medium supply end and recovery end installed at the flow channel inlet and flow channel outlet. Compared with the structure where the flow channel inlet and flow channel outlet are set opposite each other, it is more compact and can make more effective use of the limited installation space between the two liquid cooling plates.

[0016] 3. By making the S-shaped branch near the inlet longer than the S-shaped branch far from the inlet, the flow resistance between the S-shaped branch near the inlet and the S-shaped branch far from the inlet is equal. The cooling medium can flow evenly through the S-shaped branch near the inlet and the S-shaped branch far from the inlet, and finally be pumped out through the flow channel outlet. In this way, the battery pack can be cooled evenly and efficiently even in the case of an asymmetric cooling channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first three-dimensional structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the second three-dimensional structure of this utility model.

[0019] Figure 3 This is a three-dimensional structural diagram of a single liquid cooling plate of this utility model.

[0020] Figure 4 This is a schematic diagram of the exploded three-dimensional structure of this utility model.

[0021] Figure 5 This is a three-dimensional structural diagram of the substrate and flow channel plate of this utility model.

[0022] Figure 6 This is a schematic diagram of the cooling channel structure of this utility model.

[0023] Figure 7 This table shows the changes in the sum of the heat generation power of the battery pack under fast charging conditions according to this utility model.

[0024] Figure 8 This is a schematic diagram showing the top temperature of the battery pack of this utility model.

[0025] Figure 9 This is a schematic diagram of the bottom temperature of the battery pack of this utility model.

[0026] Reference numerals: 10, liquid cooling plate; 11, substrate; 111, flow channel inlet; 112, flow channel outlet; 113, thermal pad; 12, flow channel plate; 20, battery pack; 30, cooling channel; 31, far inlet S-shaped branch; 311, bending section one; 32, near inlet S-shaped branch; 321, bending section two; 33, return channel; 34, straight branch; 40, explosion-proof valve opening. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figures 1-6As shown, a top-bottom double-sided cooling liquid cooling assembly includes two centrally symmetrical liquid cooling plates 10, each composed of a substrate 11 and a flow channel plate 12. Both the substrate 11 and the flow channel plate 12 are manufactured by stamping. The two substrates 11 are in contact with the top and bottom surfaces of a battery pack 20, respectively. The substrate 11 has a flow channel inlet 111 and a flow channel outlet 112. The battery pack 20 includes several battery cell modules, each equipped with an explosion-proof valve. The flow channel plate 12 has cooling channels 30 for the flow of cooling medium. The cooling channels 30 include several remote inlet S-shaped branches 31 and several near-inlet S-shaped branches 32. The number of remote inlet S-shaped branches 31 and near-inlet S-shaped branches 32 can be increased or decreased depending on the number of battery cell modules in the battery pack 20. The flow channel inlet 111 and the flow channel outlet 112 serve as the input and output ends of the cooling medium, respectively. S-shaped branches 31 are all located on one side of the inlet 111, while S-shaped branches 32 are all located on the other side of the inlet 111. The S-shaped branches 32 are closer to the inlet 111 than the S-shaped branches 31. The stroke of the S-shaped branches 32 is greater than that of the S-shaped branches 31, so that the flow resistance between the S-shaped branches 32 and the S-shaped branches 31 is equal. When there are two S-shaped branches 31 and one S-shaped branch 32, the S-shaped branch 32 is extended by 40 mm to make the flow resistance between the S-shaped branches 31 and the S-shaped branches 32 equal. When the number of S-shaped branches 31 and the S-shaped branches 32 changes, the extension distance of the S-shaped branches 32 can be adjusted to achieve the same effect of balancing the flow rates of the S-shaped branches 31 and the S-shaped branches 32.

[0032] like Figures 2-6 As shown, the cooling channel 30 also includes a flow channel inlet 111 and a flow channel outlet 112 connected to the return channel 33. The flow channel inlet 111 and the return channel 33 are connected by a far-inlet S-shaped branch 31 and a near-inlet S-shaped branch 32.

[0033] Both the substrate 11 and the flow channel plate 12 are provided with a number of explosion-proof valve openings 40 with corresponding positions, and the explosion-proof valves pass through the explosion-proof valve openings 40 on the substrate 11 and the flow channel plate 12.

[0034] This top and bottom double-sided liquid cooling plate operates at an ambient temperature of 30℃, using a 50% concentration ethylene glycol solution as the cooling medium. The cooling medium flows into both liquid cooling plates 10 at a flow rate of 7.5 L / min and a temperature of 20℃ to dissipate heat during fast charging of the battery pack 20. The sum of the heat generated by the battery pack 20 during approximately 20 minutes of fast charging is shown in the following variation value: Figure 7 As shown.

[0035] like Figure 8 and Figure 9As shown, the battery pack 20 using this top and bottom double-sided liquid cooling plate has an average maximum top temperature of 44.8℃ under fast charging conditions. Figure 8 Compared to the bottom temperature of the pool, the average temperature reached a maximum of 40.7℃. Figure 9 The temperature difference between the top and bottom surfaces of the battery pack 20 is 4.1℃, while the temperature difference between the top and bottom surfaces of the battery pack 20 using a single bottom liquid cooling plate can reach more than 20℃ under fast charging conditions. The highest temperature of the battery pack 20 will exceed 50℃, and the extreme temperature may even approach 60℃ for a short period of time. Therefore, it can be seen that the double-sided liquid cooling plate can effectively control the temperature rise of the battery pack 20 and reduce the temperature difference between the top and bottom surfaces of the battery pack 20 under fast charging conditions.

[0036] When cooling the battery pack 20, a pumping device continuously pumps a cooling medium with a temperature of 15-25°C into the cooling channel 30 at a flow rate of at least 7.5 L / min through the inlet 111. The cooling medium can be a 50% concentration ethylene glycol solution. As the cooling medium flows through the cooling channel 30, it splits into the far-inlet S-shaped branch 31 and the near-inlet S-shaped branch 32, and then merges into the return channel 33. The near-inlet S-shaped branch 32 is longer than the far-inlet S-shaped branch 31, ensuring that the flow resistance between them is equal. This allows the cooling medium to flow evenly through both the near-inlet S-shaped branch 32 and the far-inlet S-shaped branch 31. The heat is then pumped out through the flow channel outlet 112, which allows for uniform and efficient heat dissipation of the battery pack 20 even in the case of asymmetric cooling channel 30. In particular, the battery pack 20 of new energy vehicles under fast charging conditions requires higher cooling efficiency. The high heat generated by the battery pack 20 under fast charging conditions is transferred through the substrate 11, flow channel plate 12 and cooling medium. The cooling medium cools the battery pack 20 during the flow process. The two liquid cooling plates 10 cool the top and bottom surfaces of the battery pack 20 respectively. This can reduce the maximum temperature rise of the battery pack 20 under fast charging conditions, reduce the temperature difference at the bottom of the battery pack 20, improve the temperature uniformity of the battery pack 20, and effectively improve the service life of the battery pack 20.

[0037] like Figures 2-6 As shown, more preferably, the flow channel inlets 111 and flow channel outlets 112 on the two substrates 11 are staggered by a certain distance in the horizontal position, so that the opposite flow channel inlets 111 on the two substrates 11 will not interfere with each other, and the opposite flow channel outlets 112 on the two substrates 11 will not interfere with each other. There is a gap between the two substrates 11 for placing the cooling medium supply end and recovery end installed at the flow channel inlets 111 and flow channel outlets 112.

[0038] The arrangement of the flow channel inlet 111 and flow channel outlet 112 is more compact than the opposing arrangement of the flow channel inlet 111 and flow channel outlet 112. It can make more effective use of the limited installation space between the two liquid cooling plates. Furthermore, by using the longer S-shaped branch 32 near the inlet to balance the flow resistance between the S-shaped branch 32 near the inlet and the S-shaped branch 31 far from the inlet, it can also balance the impact of the deviation of the flow channel inlet 111 and flow channel outlet 112 from the center line of the liquid cooling plate on the flow velocity of the S-shaped branch 32 near the inlet and the S-shaped branch 31 far from the inlet. Thus, while maintaining cooling efficiency, it can make more effective use of the limited installation space between the two liquid cooling plates.

[0039] like Figures 4-6 As shown, more preferably, the cooling channel 30 further includes two straight branches 34. The flow channel inlet 111 and the return channel 33 are also connected by the two straight branches 34. The straight branches 34, the far inlet S-shaped branch 31 and the near inlet S-shaped branch 32 are connected in parallel. The far inlet S-shaped branch 31 and the near inlet S-shaped branch 32 are both located between the two straight branches 34. The straight branches 34 are located at the edge of the battery pack 20.

[0040] When the cooling medium flows through the cooling channel 30, it also passes through two straight branches 34. The cooling medium flowing through the straight branches 34 cools and lowers the edge of the battery pack 20.

[0041] like Figures 2-5 As shown, more preferably, it also includes a thermal pad 111, and the substrate 11 contacts the battery pack 20 through the thermal pad 113.

[0042] By filling the air gap between the battery pack 20 and the substrate 11 with the thermal pad 113, the thermal conductivity area is increased, the efficiency of heat transfer from the battery pack 20 to the substrate 11 is improved, and the cooling efficiency of the battery pack 20 is improved.

[0043] like Figures 4-6 As shown, more preferably, the far-inlet S-shaped tributary 31 is zigzag-shaped, forming two bends 311 along the flow direction, and the near-inlet S-shaped tributary 32 is zigzag-shaped, forming two bends 321 along the flow direction.

[0044] The battery pack 20 is located between the two bends 311 of the far-inlet S-shaped branch 31 and between the two bends 321 of the near-inlet S-shaped branch 32, so that the far-inlet S-shaped branch 31 and the near-inlet S-shaped branch 32 cover a larger area of ​​the battery pack 20.

[0045] The far-inlet S-shaped branch 31 and the near-inlet S-shaped branch 32 cover the middle of the battery pack 20. Since the temperature in the middle of the battery pack 20 is much higher than that around the perimeter, the zigzag-shaped far-inlet S-shaped branch 31 and the near-inlet S-shaped branch 32 cover a larger area of ​​the battery pack 20, thereby further improving the cooling efficiency of the battery pack 20.

[0046] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A top-and-bottom double-sided cooling liquid-cooled assembly, characterized in that, The device includes two identical liquid cooling plates (10) consisting of a substrate (11) and a flow channel plate (12). The two substrates (11) are in contact with the top and bottom surfaces of the battery pack (20), respectively. The substrates (11) are provided with a flow channel inlet (111) and a flow channel outlet (112). The flow channel plate (12) is provided with a cooling channel (30) for the flow of cooling medium. The cooling channel (30) includes: a plurality of far-inlet S-shaped branches (31) and a plurality of near-inlet S-shaped branches (32). The flow channel inlet (111) is provided with a flow channel outlet (112). 11) and the flow channel outlet (112) serve as the input and output ends of the cooling medium, respectively. The near-inlet S-shaped branch (32) is closer to the flow channel inlet (111) than the far-inlet S-shaped branch (31). Both the flow channel inlet (111) and the flow channel outlet (112) are offset from the centerline of the liquid cooling plate (10). The stroke of the near-inlet S-shaped branch (32) is greater than that of the far-inlet S-shaped branch (31) so that the flow resistance of the near-inlet S-shaped branch (32) and the far-inlet S-shaped branch (31) are equal.

2. The top and bottom double-sided cooling liquid cooling assembly according to claim 1, characterized in that, The flow channel inlet (111) and the flow channel outlet (112) on the two substrates (11) are horizontally offset from each other, and there is a gap between the two substrates (11) for placing the cooling medium supply end and the recovery end installed on the flow channel inlet (111) and the flow channel outlet (112).

3. The top and bottom double-sided cooling liquid cooling assembly according to claim 1, characterized in that, The cooling channel (30) further includes a return channel (33), the channel outlet (112) is connected to the return channel (33), and the channel inlet (111) is connected to the return channel (33) through the far inlet S-shaped branch (31) and the near inlet S-shaped branch (32).

4. The top and bottom double-sided cooling liquid cooling assembly according to claim 3, characterized in that, The cooling channel (30) further includes two straight branches (34), and the flow channel inlet (111) and the return channel (33) are connected by the two straight branches (34). The straight branches (34), the far inlet S-shaped branch (31) and the near inlet S-shaped branch (32) are connected in parallel.

5. The top and bottom double-sided cooling liquid cooling assembly according to claim 1, characterized in that, The top and bottom double-sided cooling liquid cooling assembly also includes a thermal pad (113), and the substrate (11) contacts the battery pack (20) through the thermal pad (113).

6. The top and bottom double-sided cooling liquid cooling assembly according to claim 1, characterized in that, Both the substrate (11) and the flow channel plate (12) are provided with a number of explosion-proof valve openings (40) in corresponding positions.

7. The top and bottom double-sided cooling liquid cooling assembly according to claim 1, characterized in that, The far-inlet S-shaped tributary (31) is zigzag-shaped, forming two bends (311) along the flow direction, and the near-inlet S-shaped tributary (32) is zigzag-shaped, forming two bends (321) along the flow direction.

8. The top and bottom double-sided cooling liquid cooling assembly according to claim 7, characterized in that, The battery pack (20) is located between the two bending sections (311) of the far-inlet S-shaped branch (31), and the battery pack (20) is located between the two bending sections (321) of the near-inlet S-shaped branch (32).

9. The top and bottom double-sided cooling liquid cooling assembly according to claim 4, characterized in that, The linear branch (34) is located at the edge of the battery pack (20).

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