Double-layer liquid cooling plate and battery pack

Abstract

The utility model belongs to the technical field of liquid cooling plates, and particularly relates to a double-layer liquid cooling plate and a battery pack, an upper-layer flow channel and a lower-layer flow channel are arranged in a liquid cooling plate body, projections of the upper-layer flow channel and the lower-layer flow channel in the thickness direction of the liquid cooling plate body are overlapped, and flow directions are opposite; the spoiler is arranged in the upper-layer flow channel, and the top of the spoiler is flush with the top of the upper-layer flow channel. The low-temperature area in the lower-layer flow channel can perform temperature compensation on the high-temperature area in the upper-layer flow channel, the temperature difference between the inlet end and the outlet end of the upper flow channel of the liquid cooling plate body is reduced, the temperature uniformity of the liquid cooling plate body is better, and the cooling effect on the target module to be cooled is better and more uniform. On one hand, the turbulent flow pieces can play a role in turbulent flow of the cooling liquid passing through the upper-layer flow channel, improve the heat exchange efficiency and further improve the cooling effect, and on the other hand, the turbulent flow pieces can play a role in vertical supporting, improve the structural strength of the liquid cooling plate body and improve the bearing and supporting capacity of the liquid cooling plate body.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid cooling plates, and in particular relates to a double-layer liquid cooling plate and a battery pack. Background Art

[0002] With the continuous development of new energy vehicles, energy storage and other fields, liquid cooling plates as their core components must not only ensure that the heat dissipation performance meets the requirements, but also the structural performance needs to meet the requirements. In the conventional liquid cooling plate design, the coolant flows in along one end of the liquid cooling plate flow channel and flows out at the other end. The flow path of the coolant in the liquid cooling plate is relatively long, especially when the liquid cooling plate is large in size. The closer to the outlet position, the higher the coolant temperature, the significantly reduced cooling performance, and the poor temperature uniformity. In some application scenarios, the liquid cooling plate only plays a cooling role and does not require a large load-bearing strength. For example, in conventional new energy vehicles, the liquid cooling plate is arranged at the bottom of the battery pack and does not bear the gravity of the battery. The gravity of the battery is loaded on the battery pack box. However, in some application scenarios, the liquid cooling plate not only plays a cooling role but also plays a certain load-bearing role. For example, in the energy storage box, the battery packs are stacked. In order to increase the capacity of the entire cabin and the convenience of installation, liquid cooling plates are needed to bear the load. At present, the cold plate is generally stamped or extruded from an aluminum plate, and the structural strength is limited. It is difficult to meet the load-bearing and support requirements by relying solely on the structural strength of the liquid cooling plate itself. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a double-layer liquid cooling plate and a battery pack with good temperature uniformity, higher cooling effect and efficiency and higher structural strength.

[0004] The utility model provides a double-layer liquid cooling plate, comprising:

[0005] A liquid cooling plate body, wherein an upper flow channel and a lower flow channel are arranged in the liquid cooling plate body, the projections of the upper flow channel and the lower flow channel in the thickness direction of the liquid cooling plate body overlap, and the flow directions of the coolant in the upper flow channel and the lower flow channel are opposite;

[0006] The spoiler is arranged in the upper flow channel, and the top of the spoiler is flush with the top of the upper flow channel.

[0007] Furthermore, the liquid cooling plate body includes an upper panel, a middle panel and a lower panel, the upper panel is used to arrange the target heat dissipation module, the upper flow channel is arranged between the upper panel and the middle panel, and the lower flow channel is arranged between the middle plate and the lower panel.

[0008] Furthermore, the liquid cooling plate body also includes an upper frame and a lower frame, the upper flow channel is arranged on the upper frame, the upper frame is arranged between the upper panel and the middle plate, the lower flow channel is arranged on the lower frame, and the lower frame is arranged between the middle plate and the lower panel.

[0009] Furthermore, the spoiler is in a sheet shape.

[0010] Furthermore, the inlet end of the upper flow channel and the inlet end of the lower flow channel are respectively communicated with corresponding water inlet nozzles, and the outlet end of the upper flow channel and the outlet end of the lower flow channel are respectively communicated with corresponding water outlet nozzles.

[0011] Furthermore, the inlet end of the upper flow channel and the inlet end of the lower flow channel are connected to the same water inlet nozzle, and the outlet end of the upper flow channel and the outlet end of the lower flow channel are connected to the same water outlet nozzle, and the water inlet nozzle and the water outlet nozzle are arranged on the upper panel and / or the lower panel.

[0012] Furthermore, two openings are arranged on the middle plate, and the upper flow channel and the lower flow channel are both bent, the inlet end of the upper flow channel is connected with the inlet end of the lower flow channel through one of the openings, and the water inlet nozzle is connected with the opening, and the outlet end of the upper flow channel is connected with the outlet end of the lower flow channel through another opening, and the water outlet nozzle is connected with the opening.

[0013] Furthermore, the water inlet and the water outlet are located on the same side of the liquid cooling plate body.

[0014] Furthermore, the water inlet and the water outlet are both arranged on the upper panel, or are both arranged on the lower panel.

[0015] The present utility model also provides a battery pack, including a battery module, an upper cover and a double-layer liquid cooling plate as described above, wherein the battery module is arranged on a liquid cooling plate body in the double-layer liquid cooling plate and is located above the upper flow channel, and the upper cover covers the outside of the battery module and is connected to the liquid cooling plate body.

[0016] The beneficial effect of the utility model is that, in the double-layer liquid cooling plate, the upper flow channel is mainly used for the heat dissipation of the target module to be cooled, and the lower flow channel is mainly used for the temperature compensation of the upper flow channel and assisting the heat dissipation of the target module to be cooled. Since the projections of the upper flow channel and the lower flow channel in the thickness direction of the liquid cooling plate body overlap, the flow directions of the coolant in the upper flow channel and the lower flow channel are opposite. The lower temperature area in the lower flow channel can perform temperature compensation for the higher temperature area in the upper flow channel, thereby reducing the temperature difference between the inlet and outlet ends of the flow channel on the liquid cooling plate body. The liquid cooling plate body has better temperature uniformity, and the cooling effect on the target module to be cooled is better and more uniform.

[0017] Since the upper flow channel is mainly used for heat dissipation of the target module to be cooled, and the heat exchange demand is large, the utility model sets a spoiler in the upper flow channel. On the one hand, it can spoil the coolant passing through the upper flow channel, improve the heat exchange efficiency, and further improve the cooling effect. On the other hand, the spoiler can play a role of vertical support, increase the structural strength of the liquid cooling plate body, and improve its load-bearing and support capacity. Compared with the method of setting two sets of flow channels with opposite flow directions on a single-layer liquid cooling plate, when the surface area of ​​the liquid cooling plate is the same, the width of the single flow channel structure of the utility model is larger, the flow resistance is smaller, and it is also more convenient to arrange the spoiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first decomposed state of the double-layer liquid cooling plate of the utility model.

[0019] Figure 2 It is a schematic diagram of the second decomposed state of the double-layer liquid cooling plate of the utility model.

[0020] Figure 3 It is a schematic diagram of the exploded structure of the battery pack of the present utility model.

[0021] In the figure: 1. upper panel; 2. middle panel; 21. opening; 3. lower panel; 4. upper frame; 41. upper flow channel; 5. lower frame; 51. lower flow channel; 6. spoiler; 7. water inlet; 8. water outlet; 100. double-layer liquid cooling plate; 200. battery module; 300. upper cover. DETAILED DESCRIPTION

[0022] like Figure 1-Figure 3 As shown, the utility model provides a double-layer liquid cooling plate 100, which includes a liquid cooling plate body and a spoiler 6. An upper flow channel 41 and a lower flow channel 51 are arranged in the liquid cooling plate body, and in the thickness direction of the liquid cooling plate body, the upper flow channel 41 is located above the lower flow channel 51, and the coolant flowing through the upper flow channel 41 is used to take away the heat of the target module to be cooled. The projections of the upper flow channel 41 and the lower flow channel 51 in the thickness direction of the liquid cooling plate body overlap, that is, the projections of the upper flow channel 41 and the lower flow channel 51 in the thickness direction of the liquid cooling plate body completely overlap or partially overlap, and the position of the inlet end of the lower flow channel 41 corresponds to the position of the outlet end of the upper flow channel 41, and the position of the outlet end of the lower flow channel 51 corresponds to the position of the inlet end of the upper flow channel 41, so that the flow directions of the coolant in the upper flow channel 41 and the lower flow channel 51 are opposite. The spoiler 6 is disposed in the upper flow channel 41 , and the top of the spoiler 6 is flush with the top of the upper flow channel 41 .

[0023] After the coolant absorbs heat along the flow channel, the temperature of the area near the flow channel outlet will be significantly higher than the temperature of the area near the flow channel inlet, so that there will be a relatively obvious temperature difference at both ends of the flow channel, that is, there will be a low temperature zone and a high temperature zone, the low temperature zone is the area near the flow channel inlet, and the high temperature zone is the area near the flow channel outlet. The double-layer liquid cooling plate 100 provided by the utility model has an upper layer flow channel 41 mainly used for heat dissipation of the target module to be cooled, and a lower layer flow channel 51 is mainly used for temperature compensation of the upper layer flow channel 41 and assisting the heat dissipation of the target module to be cooled. Since the projections of the upper layer flow channel 41 and the lower layer flow channel 51 in the thickness direction of the liquid cooling plate body overlap, the coolant flows in the upper layer flow channel 41 and the lower layer flow channel 51 in opposite directions, and the lower temperature area in the lower layer flow channel 51 can compensate the temperature of the higher temperature area in the upper layer flow channel 41, thereby reducing the temperature difference between the flow channel inlet and outlet on the liquid cooling plate body, and the temperature uniformity of the liquid cooling plate body is better, and the cooling effect on the target module to be cooled is better and more uniform.

[0024] Since the upper flow channel 41 is mainly used for heat dissipation of the target module to be cooled, and the heat exchange demand is large, the utility model sets a spoiler 6 in the upper flow channel 41. On the one hand, it can spoil the coolant passing through the upper flow channel 41, improve the heat exchange efficiency, and further improve the cooling effect. On the other hand, the spoiler 6 can play a role of vertical support, increase the structural strength of the liquid cooling plate body 1, and improve its load-bearing and support capacity. Compared with the method of setting two sets of flow channels with opposite flow directions on a single-layer liquid cooling plate, when the surface area of ​​the liquid cooling plate is the same, the width of the single flow channel structure of the utility model is larger, the flow resistance is smaller, and it is also more convenient to arrange the spoiler 6.

[0025] In the present invention, the spoiler 6 is preferably in the form of a sheet, which not only plays a spoiling role and increases the structural strength, but also occupies less space in the upper flow channel 41 and reduces the flow resistance. The spoiler 6 can be a straight or corrugated sheet, which can be arranged vertically or obliquely in the upper flow channel 41, or can be arranged in a staggered manner. The specific arrangement method is determined according to actual needs. In other arrangements, the spoiler 6 can also be in other shapes, such as an arch or a frame.

[0026] The liquid cooling plate body includes an upper panel 1, an intermediate panel 2 and a lower panel 3. The upper panel 1, the intermediate panel 2 and the lower panel 3 are fixed by bolts or other means. The upper panel 1 is used to arrange the target heat dissipation module. The upper flow channel 41 is arranged between the upper panel 1 and the intermediate panel 2, and the lower flow channel 51 is arranged between the intermediate panel 2 and the lower panel 3. Compared with the one-piece liquid cooling plate body, the utility model adopts a layered structure, the upper flow channel 41 and the lower flow channel 51 are less restricted in processing, the layout form is more optional, and the processing difficulty and cost of the upper flow channel 41 and the lower flow channel 51 can be reduced, and the processing efficiency can be improved. At the same time, it is convenient to arrange the spoiler 6 in the upper flow channel 41, and it is also convenient to modify the spoiler 6 according to the actual cooling requirements.

[0027] In another configuration of the present invention, Figure 2 As shown, the upper flow channel 41 is opened on the upper surface of the middle plate 2 , and the lower flow channel 51 is opened on the lower surface of the middle plate 2 .

[0028] In one configuration of the present invention, Figure 1 As shown, the liquid cooling plate body also includes an upper frame 4 and a lower frame 5, an upper flow channel 41 is arranged on the upper frame 4, and the upper flow channel 41 is arranged through the upper frame 4, and the upper frame 4 is arranged between the upper panel 1 and the upper surface of the middle plate 2, and a lower flow channel 51 is arranged on the lower frame 5, and the lower flow channel 51 is arranged through the lower frame 5, and the lower frame 5 is arranged between the lower surface of the middle plate 2 and the lower panel 3. The upper panel 1, the upper frame 4, the middle plate 2, the lower frame 5 and the lower panel 3 are fixed in sequence, and the spoiler 6 is fixed on the middle plate 2 and penetrates the upper flow channel 41. This arrangement makes the processing difficulty of the upper flow channel 41 and the lower flow channel 51 lower. When the upper frame 4 and the lower frame 5 are fixedly connected or integrally arranged with the middle plate 2, a structure as shown in the following is formed. Figure 2 In the above-mentioned setting mode, the spoiler 6 is fixed on the middle plate 2 and is located in the upper flow channel 41. The height of the spoiler 6 is the same as the height of the upper flow channel 41. After the upper panel 1 and the middle plate 2 are connected, the top of the spoiler 6 contacts the upper panel 1, thereby playing the effect of strengthening the structure and improving the supporting capacity.

[0029] In one configuration of the utility model, the inlet end of the upper flow channel 41 and the inlet end of the lower flow channel 51 are respectively connected to the corresponding water inlet nozzle 7, that is, the inlet end of the upper flow channel 41 and the inlet end of the lower flow channel 51 are respectively connected to the independent water inlet nozzle 7. The outlet end of the upper flow channel 41 and the outlet end of the lower flow channel 51 are respectively connected to the corresponding water outlet nozzle 8, that is, the outlet end of the upper flow channel 41 and the outlet end of the lower flow channel 51 are respectively connected to the independent water outlet nozzle 8. The aforementioned water inlet nozzle 7 and water outlet nozzle 8 are arranged on the upper panel 1 and / or the lower panel 3 and are connected to the external coolant circulation mechanism. In this configuration, the upper flow channel 41 and the lower flow channel 51 can be straight or bent, ensuring that the position of the inlet end of the upper flow channel 41 corresponds to the position of the outlet end of the upper flow channel 41, and the position of the outlet end of the lower flow channel 51 corresponds to the position of the inlet end of the upper flow channel 41.

[0030] In another configuration of the present invention, the inlet end of the upper flow channel 41 and the inlet end of the lower flow channel 51 are connected to the same water inlet nozzle 7, and the outlet end of the upper flow channel 41 and the outlet end of the lower flow channel 51 are connected to the same water outlet nozzle 8. The water inlet nozzle 7 and the water outlet nozzle 8 are arranged on the upper panel 1 and / or the lower panel 3, and are connected to the external coolant circulation mechanism. This configuration can reduce the number of water inlet nozzles 7 and water outlet nozzles 8, thereby reducing the number of pipelines required to be connected and reducing the complexity of the pipelines.

[0031] In the above-mentioned arrangement using the same water inlet nozzle 7 and the same water outlet nozzle 8, the specific arrangement is that the middle plate 2 is provided with two openings 21, such as Figure 1 and Figure 2 As shown, preferably, the upper flow channel 41 and the lower flow channel 51 are both bent, so that the inlet end of the upper flow channel 41 is located close to the inlet end of the lower flow channel 51, and the outlet end of the upper flow channel 41 is located close to the outlet end of the lower flow channel 51. The inlet end of the upper flow channel 41 is connected to the inlet end of the lower flow channel 51 through one of the openings 21, and the water inlet nozzle 7 is connected to the opening 21. The outlet end of the upper flow channel 41 is connected to the outlet end of the lower flow channel 51 through another opening 21, and the water outlet nozzle 8 is connected to the opening 21. Figure 1 and Figure 2 The figure schematically shows the bending shapes of the upper flow channel 41 and the lower flow channel 51. In other settings, the upper flow channel 41 and the lower flow channel 51 can be other bending shapes as long as the lower temperature area of ​​the lower flow channel 51 overlaps with the higher temperature area of ​​the upper flow channel 41.

[0032] In the utility model, the water inlet nozzle 7 and the water outlet nozzle 8 are located on the same side of the liquid cooling plate body. It is further preferred that the water inlet nozzle 7 and the water outlet nozzle 8 are both arranged on the upper panel 1, or are both arranged on the lower panel 3, so as to facilitate the connection of the cooling liquid pipeline.

[0033] The utility model also provides a battery pack, such as Figure 3 As shown, the battery pack includes a battery module 200, an upper cover 300 and the double-layer liquid cooling plate 100 as mentioned above. The battery module 200 is the target heat dissipation module. The battery module 200 is arranged on the liquid cooling plate body in the double-layer liquid cooling plate 100 and is located above the upper flow channel 41, and the lower flow channel 51 is located below the upper flow channel 41. The upper cover 300 covers the outside of the battery module 200 and is connected to the upper panel 1 in the liquid cooling plate body through fasteners such as bolts. The heat generated by the battery module 200 can be directly taken away by the liquid cooling plate body. After removing the upper cover 300, the battery module 200 can be directly maintained.

[0034] In the battery pack provided by the utility model, the coolant flows in opposite directions in the upper flow channel 41 and the lower flow channel 51. The low-temperature zone in the lower flow channel 51 can perform temperature compensation for the high-temperature zone in the upper flow channel 41. The liquid cooling plate body 1 has better temperature uniformity, and the cooling effect on the battery module 200 is better and more uniform. At the same time, the liquid cooling plate body 1 has higher structural strength, better load-bearing and supporting capabilities, and higher reliability, which meets the load-bearing and supporting requirements when the battery packs are stacked.

[0035] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0036] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A double-layer liquid cooling plate, characterized in that it comprises: A liquid cooling plate body, wherein an upper flow channel (41) and a lower flow channel (51) are arranged in the liquid cooling plate body, the projections of the upper flow channel (41) and the lower flow channel (51) in the thickness direction of the liquid cooling plate body overlap, and the flow directions of the cooling liquid in the upper flow channel (41) and the lower flow channel (51) are opposite; A spoiler (6), wherein the spoiler (6) is arranged in the upper flow channel (41), and the top of the spoiler (6) is flush with the top of the upper flow channel (41).

2. The double-layer liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate body comprises an upper panel (1), an intermediate panel (2) and a lower panel (3); the upper panel (1) is used to arrange a target heat dissipation module; the upper flow channel (41) is arranged between the upper panel (1) and the intermediate panel (2); and the lower flow channel (51) is arranged between the intermediate panel (2) and the lower panel (3).

3. The double-layer liquid cooling plate according to claim 2, characterized in that: The liquid cooling plate body further comprises an upper frame (4) and a lower frame (5), the upper flow channel (41) being arranged on the upper frame (4), the upper frame (4) being arranged between the upper panel (1) and the middle panel (2), the lower flow channel (51) being arranged on the lower frame (5), the lower frame (5) being arranged between the middle panel (2) and the lower panel (3).

4. The double-layer liquid cooling plate according to any one of claims 1 to 3, characterized in that: The spoiler (6) is in the shape of a sheet.

5. The double-layer liquid cooling plate according to any one of claims 1 to 3, characterized in that: The inlet end of the upper flow channel (41) and the inlet end of the lower flow channel (51) are respectively connected to corresponding water inlet nozzles (7), and the outlet end of the upper flow channel (41) and the outlet end of the lower flow channel (51) are respectively connected to corresponding water outlet nozzles (8).

6. The double-layer liquid cooling plate according to claim 2 or 3, characterized in that: The inlet end of the upper flow channel (41) and the inlet end of the lower flow channel (51) are in communication with the same water inlet nozzle (7), and the outlet end of the upper flow channel (41) and the outlet end of the lower flow channel (51) are in communication with the same water outlet nozzle (8), and the water inlet nozzle (7) and the water outlet nozzle (8) are arranged on the upper panel (1) and / or the lower panel (3).

7. The double-layer liquid cooling plate according to claim 6, characterized in that: The middle plate (2) is provided with two openings (21), the upper flow channel (41) and the lower flow channel (51) are both arranged in a bent state, the inlet end of the upper flow channel (41) is connected to the inlet end of the lower flow channel (51) through one of the openings (21), and the water inlet nozzle (7) is connected to the opening (21), the outlet end of the upper flow channel (41) is connected to the outlet end of the lower flow channel (51) through the other opening (21), and the water outlet nozzle (8) is connected to the opening (21).

8. The double-layer liquid cooling plate according to claim 6, wherein: The water inlet (7) and the water outlet (8) are located on the same side of the liquid cooling plate body.

9. The double-layer liquid cooling plate according to claim 8, characterized in that: The water inlet (7) and the water outlet (8) are both arranged on the upper panel (1), or are both arranged on the lower panel (3).

10. A battery pack, characterized in that: The invention comprises a battery module (200), an upper cover (300), and a double-layer liquid cooling plate (100) according to any one of claims 1 to 9, wherein the battery module (200) is arranged on a liquid cooling plate body in the double-layer liquid cooling plate (100) and is located above an upper flow channel (41), and the upper cover (300) covers the outside of the battery module (200) and is connected to the liquid cooling plate body.

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