Liquid cooling device, battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, and particularly provides a liquid cooling device, a battery pack and electric equipment. The liquid cooling device comprises a cover plate, a flow channel plate and connecting pipes, the cover plate comprises a liquid inlet and a liquid outlet, the flow channel plate is in sealed connection with the cover plate, the connecting pipes are arranged at the liquid inlet and the liquid outlet of the cover plate, the cover plate and the flow channel plate are connected to form a flow channel, a buffer groove is concavely formed in the position, at the liquid inlet and / or the liquid outlet, of the bottom wall of the flow channel, and the buffer groove is communicated with the flow channel. According to the utility model, the flow resistance and the pressure drop can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically providing a liquid cooling device, a battery pack, and electrical equipment. Background Technology

[0002] A liquid cooling plate is a type of heat exchanger that indirectly transfers heat from the heat-generating components to a cooling liquid enclosed in a circulation system. The cooling liquid then carries away the heat. Liquid cooling plates are critical components in battery systems, significantly impacting the overall weight, safety, and reliability of the battery.

[0003] In the flow channel design of liquid cooling plates, pressure drop is an important indicator for evaluating the performance of liquid cooling plates. Its magnitude will affect the energy consumption of the pump and the heat exchange effect of the liquid cooling plate. The pressure drop of the liquid cooling plate depends on the flow channel design. In order to reduce flow resistance, it is often necessary to adjust the flow channel distribution of the liquid cooling plate, but this will also affect the heat exchange capacity of the liquid cooling plate, thereby affecting the heat exchange effect and hindering the heat dissipation of the battery pack.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems and provide a novel liquid cooling device that can reduce flow resistance and pressure drop.

[0006] This utility model provides a liquid cooling device, comprising:

[0007] Cover plate, including inlet and outlet;

[0008] The flow channel plate is sealed to the cover plate;

[0009] A connecting pipe is provided at the liquid inlet and liquid outlet of the cover plate;

[0010] The cover plate and the flow channel plate are connected to form a flow channel, and the bottom wall of the flow channel is provided with a recessed buffer groove at the liquid inlet and / or liquid outlet.

[0011] With the above technical solution, the cover plate and flow channel plate of this utility model are connected by a flow channel, in which the cooling liquid can flow to cool the battery. The bottom wall of the flow channel has a recessed buffer groove at the inlet and / or outlet, which is connected to the flow channel. The cooling liquid enters the liquid cooling plate through the inlet and / or outlet. When entering and / or flowing out of the liquid cooling plate, the inlet and / or outlet are the areas with the highest flow velocity and the largest flow rate. The buffer groove at the inlet and / or outlet is locally deepened to form a locally deepened flow channel, reducing the coolant flow resistance loss at the inlet and / or outlet, and reducing the pressure drop of the liquid cooling plate without changing the flow channel distribution.

[0012] In the preferred embodiment of the above-mentioned liquid cooling device, the projection of the liquid inlet and / or liquid outlet in the horizontal direction at least partially overlaps with the buffer tank.

[0013] When the above technical solution is adopted, the inlet and / or outlet are the areas with the highest flow rate and the largest flow volume when entering and / or flowing out of the liquid cooling plate. The inlet and / or outlet at least partially overlap with the horizontal projection of the buffer tank, which can at least reduce some of the flow resistance loss and thus reduce the pressure drop of the liquid cooling plate.

[0014] In the preferred embodiment of the above-mentioned liquid cooling device, the flow channel has a first depth, the buffer tank has a second depth, and the first depth is greater than the second depth.

[0015] When the above technical solution is adopted, the depth of the flow channel is greater than the depth of the buffer tank. This not only ensures that the depth of the flow channel is sufficient for the normal flow of coolant, but also allows for the local deepening of the flow channel plate to obtain a buffer tank with a depth less than the flow channel depth. Without changing the material of the flow channel plate, the metallic properties of the flow channel plate are fully utilized, thereby reducing the flow resistance of the liquid cooling plate inlet and / or outlet.

[0016] In the preferred embodiment of the above-mentioned liquid cooling device, the first depth is 2.5 mm to 4 mm, and the second depth is 0.5 mm to 2 mm.

[0017] When the above technical solution is adopted, the depth of the flow channel is 2.5mm to 4mm, which not only ensures the normal depth of the flow channel and achieves a good cooling effect, but also makes full use of the metal properties of the flow channel plate to reduce the pressure drop of the coolant flowing through the entire liquid cooling plate without increasing costs or changing the material of the flow channel plate.

[0018] In the preferred embodiment of the above-mentioned liquid cooling device, the flow channel has a first width, the buffer groove has a second width, and the first width is greater than the second width.

[0019] When the above technical solution is adopted, the width of the flow channel is greater than the width of the buffer tank, which can ensure that the width of the flow channel can allow the coolant to flow normally and achieve a better cooling effect.

[0020] In the preferred embodiment of the above-mentioned liquid cooling device, the first width is 8mm to 25mm, and the second width is 5mm to 10mm.

[0021] By adopting the above technical solution, while ensuring that the width of the flow channel can allow for normal flow of coolant and achieve a better cooling effect, it also facilitates the processing and forming of the buffer tank, thereby reducing manufacturing costs and improving production efficiency.

[0022] In the preferred embodiment of the above-mentioned liquid cooling device, the flow channel includes an inlet pipe and an outlet pipe. The inlet pipe includes multiple inlet sub-pipes, and the outlet pipe includes multiple outlet sub-pipes. The distance between two adjacent inlet sub-pipes is greater than the distance between two adjacent outlet sub-pipes.

[0023] When the above technical solution is adopted, the coolant enters the liquid cooling plate from the inlet. The temperature of the coolant entering is relatively low, which has a good cooling effect on the battery. The larger distance between two adjacent inlet sub-pipes also has a good cooling effect. However, the temperature of the coolant in the outlet pipe is relatively high, which requires a larger cooling area. That is, the smaller distance between two adjacent outlet sub-pipes is needed to achieve a good cooling effect.

[0024] In the preferred embodiment of the above-mentioned liquid cooling device, the liquid inlet sub-pipe includes a first sub-pipe close to the liquid inlet and a second sub-pipe away from the liquid inlet, wherein the first flow channel width of the first sub-pipe is greater than the second flow channel width of the second sub-pipe.

[0025] When the above technical solution is adopted, the first sub-pipe is close to the liquid inlet, and the second sub-pipe is far away from the liquid inlet. That is, the cooling liquid first passes through the first sub-pipe and then through the second sub-pipe. The pressure inside the first sub-pipe is greater than the pressure inside the second sub-pipe. This can ensure that the liquid cooling plate has a good cooling effect, and at the same time, it can also make the flow rate of the cooling liquid inside the liquid cooling plate faster, thereby better cooling the battery.

[0026] In a second aspect, the present invention provides a battery pack including the liquid cooling device described in the first aspect.

[0027] In a third aspect, this utility model provides an electrical device including the battery pack described in the second aspect. Attached Figure Description

[0028] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a cross-sectional view of the liquid inlet of the liquid cooling device of this utility model;

[0030] Figure 2 This is a schematic diagram of the flow channel plate of this utility model;

[0031] Figure 3 This is a top view of the flow channel plate of this utility model;

[0032] Figure 4 This is a partially enlarged top view of the flow channel plate of this utility model.

[0033] Figure label:

[0034] 1. Cover plate; 11. Liquid inlet;

[0035] 2. Flow channel plate; 20. Main body; 21. Flow channel; 211. Liquid inlet pipe; 212. Liquid outlet pipe; 213. Liquid inlet sub-pipe; 214. Liquid outlet sub-pipe; 215. First sub-pipe; 216. Second sub-pipe; 22. Bottom wall; 23. Buffer tank;

[0036] 3. Connecting pipe; 31. Through hole; 32. Connecting part;

[0037] h1, first width; h2, second width; t1, first depth; t2, second depth; X, first direction; Y, second direction. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection," "setting," and "installation" 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, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] like Figures 1 to 4As shown, in a first aspect, the liquid cooling device of this utility model includes a cover plate 1, a flow channel plate 2, and a connecting pipe 3. The cover plate 1 includes an inlet 11 and an outlet (not shown). The flow channel plate 2 is sealed to the cover plate 1. The connecting pipe 3 is disposed on the cover plate 1, and both the inlet 11 and the outlet are connected to the connecting pipe 3. The cover plate 1 and the flow channel plate 2 are connected to form a flow channel 21. The bottom wall 22 of the flow channel 21 is recessed at the inlet 11 and / or the outlet and is provided with a buffer groove 23. The buffer groove 23 communicates with the flow channel 21. In this embodiment, the bottom wall 22 of the flow channel 21 may be recessed at the inlet 11, or it may be recessed at the outlet, or it may be recessed at both the inlet 11 and the outlet.

[0042] In this invention, the cover plate 1 and the flow channel plate 2 are welded together. The flow channel plate 2 includes a main body 20 and a groove recessed from the main body 20 away from the cover plate 1. The groove of the cover plate 1 and the flow channel plate 2 form a flow channel 21. The cover plate 1 and the flow channel plate 2 are connected by the flow channel 21, and the cooling liquid can flow in the flow channel 21 to cool the battery. The bottom wall 22 of the flow channel 21 has a recessed buffer groove 23 at the liquid inlet 11 and / or liquid outlet. The buffer groove 23 is connected to the flow channel 21. Cooling liquid enters the liquid cooling device through the liquid inlet 11 and / or liquid outlet. When entering and / or flowing out of the liquid cooling device, the liquid inlet 11 and / or liquid outlet are the areas with the highest flow velocity and the largest flow rate. The buffer groove 23 is set at the liquid inlet 11 and / or liquid outlet to locally deepen the flow channel 21, thereby reducing the coolant flow resistance loss at the liquid inlet 11 and / or liquid outlet and reducing the pressure drop of the liquid cooling device without changing the distribution of the flow channel 21. In this utility model, the liquid cooling device is a liquid cooling plate.

[0043] like Figure 1 As shown, the inlet 11 and / or outlet of this invention at least partially overlap with the horizontal projection of the buffer tank 23. When the liquid inlet 11 and / or outlet enter and / or flow out of the liquid cooling plate, the inlet 11 and outlet are the areas with the highest flow velocity and the largest flow rate. The at least partial overlap between the horizontal projection of the inlet 11 and / or outlet and the buffer tank 23 can at least reduce some of the flow resistance loss, thereby reducing the pressure drop of the liquid cooling plate. In this embodiment, the connecting pipe 3 has a through hole 31 communicating with the flow channel 21. The diameter of the through hole 31 is 14 mm. One end of the connecting pipe 3 is provided with a connecting part 32 that is welded to the cover plate 1.

[0044] like Figure 1As shown, the flow channel 21 has a first depth t1, and the buffer groove 23 has a second depth t2. The first depth t1 is greater than the second depth t2. The greater depth of the flow channel 21 than the buffer groove 23 not only ensures that the flow channel 21 is deep enough to allow for normal flow of coolant, but also utilizes the local deepening of the flow channel plate 2 to obtain the buffer groove 23, which has a depth less than that of the flow channel 21. Without changing the material of the flow channel plate 2, the metallic properties of the flow channel plate 2 are fully utilized, thereby reducing the flow resistance of the liquid cooling plate inlet 11 and / or outlet. The depth of the flow channel 21 is 2.5mm to 4mm. In this embodiment, it can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1m, 3.2m, 3.3m, 3.4m, 3.5m, 3.5m, 3.6m, 3.7m, 3.8m, 3.9m, or 4mm, preferably 3mm. The depth of the buffer groove 23 is 0.5mm to 2mm. In this embodiment, it can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm, preferably 1.0mm. The depth of the flow channel 21 is 2.5mm to 4mm. This not only ensures the normal depth of the flow channel 21 and achieves a good cooling effect, but also fully utilizes the metallic properties of the flow channel plate 2 to reduce the pressure drop of the coolant flowing through the entire liquid cooling plate without increasing costs or changing the material of the flow channel plate 2. The projected shape of the buffer groove 23 is not limited, as long as it has a certain depth to reduce flow resistance. In this embodiment, the buffer groove 23 is projected as a circle in the horizontal direction, and a rounded corner is provided between the buffer groove 23 and the bottom wall 22 to further reduce flow resistance and thus reduce pressure drop.

[0045] like Figure 1 As shown, the flow channel 21 has a first width h1, and the buffer groove 23 has a second width h2. The first width h1 is greater than the second width h2. The width of the flow channel 21 is greater than the width of the buffer groove 23, which ensures that the width of the flow channel 21 is sufficient for the normal flow of coolant and achieves a better cooling effect. The width of the flow channel 21 is 8mm to 25mm. In this embodiment, it can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, or 25mm, preferably 18mm. The width of the buffer groove 23 is 5mm to 10mm. In this embodiment, it can be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, preferably 7mm. While ensuring that the width of the flow channel 21 is sufficient for the normal flow of coolant and achieves a good cooling effect, it also facilitates the processing and forming of the buffer tank 23, thereby reducing manufacturing costs and improving production efficiency.

[0046] like Figures 2 to 4 As shown, the flow channel 21 includes an inlet pipe 211 and an outlet pipe 212. The inlet pipe 211 includes multiple inlet sub-pipes 213, and the outlet pipe 212 includes multiple outlet sub-pipes 214. The distance between two adjacent inlet sub-pipes 213 is greater than the distance between two adjacent outlet sub-pipes 214. Cooling liquid enters the liquid cooling plate from the inlet 11. The temperature of the entering cooling liquid is relatively low, which provides a good cooling effect for the battery. The relatively large distance between two adjacent inlet sub-pipes 213 also contributes to a good cooling effect. However, the temperature of the cooling liquid in the outlet pipe 212 is higher, requiring a larger cooling area. Therefore, the distance between two adjacent outlet sub-pipes 214 is smaller to achieve a better cooling effect.

[0047] like Figures 2 to 4 As shown, the liquid inlet sub-pipe 213 includes a first sub-pipe 215 near the liquid inlet 11 and a second sub-pipe 216 away from the liquid inlet 11. The width of the first flow channel of the first sub-pipe 215 is greater than the width of the second flow channel of the second sub-pipe 216. The first sub-pipe 215 is near the liquid inlet 11, and the second sub-pipe 216 is away from the liquid inlet 11. That is, the cooling liquid first passes through the first sub-pipe 215 and then through the second sub-pipe 216. The pressure inside the first sub-pipe 215 is greater than the pressure inside the second sub-pipe 216. This can ensure that the liquid cooling plate has a better cooling effect and also make the flow rate of the cooling liquid in the liquid cooling plate faster, thereby better cooling the battery.

[0048] like Figure 3 As shown, the liquid cooling device has a first end and a second end. The liquid inlet 11 and the liquid outlet are located at the first end, and the end away from the liquid inlet 11 and the liquid outlet is the second end. The flow channel 21 extends along a first direction X from the first end to the second end, and multiple flow channels 21 are arranged along a second direction Y perpendicular to the first direction X.

[0049] In a second aspect, the battery pack of this utility model includes the liquid cooling device of the first aspect. The battery pack of this technical solution includes the liquid cooling device as described in any of the technical solutions of this utility model, and therefore possesses all the technical effects of the liquid cooling device of any of the technical solutions of this utility model.

[0050] In a third aspect, the electrical device of this utility model includes the battery pack of the second aspect. The electrical device of this technical solution includes the battery pack of any technical solution of this utility model, and therefore possesses all the technical effects of the battery pack of any technical solution of this utility model.

[0051] It should be noted that the above preferred embodiments are merely illustrative of the principles of this utility model and are not intended to limit the scope of protection of this utility model. Without departing from the principles of this utility model, those skilled in the art can adjust the above-described settings to make this utility model applicable to more specific application scenarios.

[0052] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods that are suitable for more specific application scenarios.

[0053] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A liquid cooling device, characterized in that, include: Cover plate, including inlet and outlet; The flow channel plate is sealed to the cover plate; A connecting pipe is provided at the liquid inlet and liquid outlet of the cover plate; The cover plate and the flow channel plate are connected to form a flow channel, and the bottom wall of the flow channel is provided with a recessed buffer groove at the liquid inlet and / or liquid outlet.

2. The liquid cooling device according to claim 1, characterized in that, The horizontal projection of the inlet and / or outlet at least partially overlaps with the buffer tank.

3. The liquid cooling device according to claim 1, characterized in that, The flow channel has a first depth, and the buffer groove has a second depth, wherein the first depth is greater than the second depth.

4. The liquid cooling device according to claim 3, characterized in that, The first depth is 2.5 mm to 4 mm, and the second depth is 0.5 mm to 2 mm.

5. The liquid cooling device according to claim 1, characterized in that, The flow channel has a first width, and the buffer groove has a second width, wherein the first width is greater than the second width.

6. The liquid cooling device according to claim 5, characterized in that, The first width is 8mm to 25mm, and the second width is 5mm to 10mm.

7. The liquid cooling device according to claim 1, characterized in that, The flow channel includes an inlet pipe and an outlet pipe. The inlet pipe includes multiple inlet sub-pipes, and the outlet pipe includes multiple outlet sub-pipes. The distance between two adjacent inlet sub-pipes is greater than the distance between two adjacent outlet sub-pipes.

8. The liquid cooling device according to claim 7, characterized in that, The liquid inlet sub-pipe includes a first sub-pipe close to the liquid inlet and a second sub-pipe away from the liquid inlet, wherein the width of the first sub-pipe is greater than the width of the second sub-pipe.

9. A battery pack, characterized in that, Includes the liquid cooling device as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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