Liquid cooling plate, battery pack and vehicle

Abstract

The utility model provides a liquid cooling plate, a battery pack and a vehicle. The liquid cooling plate comprises a first side plate and a second side plate; the first side plate and the second side plate are oppositely arranged, and a liquid cooling space for accommodating cooling liquid is formed between the first side plate and the second side plate; at least one of the first side plate and the second side plate is of a double-layer hollow structure. According to the liquid cooling plate provided by the utility model, at least one side plate in contact with the battery monomers is designed into the double-layer hollow structure, so that the side plate is provided with the hollow cavity, and the expansion deformation of the battery cell can be accommodated. Meanwhile, the liquid cooling plate also retains the structural characteristic of large-area heat dissipation of the traditional liquid cooling plate, and has excellent heat dissipation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat dissipation, and particularly relates to a liquid cooling plate, a battery pack and a vehicle. Background Art

[0002] Currently, the heat dissipation of the battery pack in new energy electric vehicles has become an important factor affecting the working performance of the battery pack.

[0003] In the battery pack, in order to improve the heat dissipation efficiency of the battery cells, the industry has designed a liquid cooling plate that can be in large-area contact with the battery cells for heat dissipation. This liquid cooling plate is clamped in the gap between two adjacent battery cells, in contact with the large surface of the battery cells, and the heat dissipation efficiency can be improved by increasing the contact area.

[0004] However, since the liquid cooling plate occupies the reserved expansion gap between the battery cells, when the battery cells heat up and expand, there is a lack of sufficient deformation accommodation space, and the expansion of the battery cells is blocked. Summary of the Utility Model

[0005] In view of this, the utility model aims to provide a liquid cooling plate, a battery pack and a vehicle, which can ensure the heat dissipation efficiency of the battery cells while also having an effective expansion space.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] An embodiment of the utility model provides a liquid cooling plate, which includes a first side plate and a second side plate;

[0008] The first side plate and the second side plate are arranged oppositely, and a liquid cooling space for accommodating a coolant is formed between the first side plate and the second side plate;

[0009] Wherein, at least one of the first side plate and the second side plate is a double-layer hollow structure.

[0010] Further, the double-layer hollow structure includes an outer layer plate and an inner layer plate;

[0011] The inner layer plate is located on the side of the outer layer plate closer to the liquid cooling space;

[0012] Along the height direction of the liquid cooling plate, the upper and lower ends of the outer layer plate and the inner layer plate are connected, and a hollow cavity is formed at intervals in the middle.

[0013] Further, along the height direction of the liquid cooling plate, from the top and bottom of the liquid cooling plate to the middle position, the distance between the outer layer plate and the inner layer plate gradually increases.

[0014] Further, both the first side plate and the second side plate are of a double-layer hollow structure, and a reinforcing rib is provided between the inner layer plates of the first side plate and the inner layer plates of the second side plate.

[0015] Further, the reinforcing rib is in a straight linear structure or a V-shaped structure.

[0016] Further, along the height direction of the liquid cooling plate, multiple reinforcing ribs are arranged at intervals to divide the liquid cooling space into multiple sub-spaces;

[0017] From the top and bottom to the middle position of the liquid cooling plate, the height of each sub-space gradually increases.

[0018] Further, the inner layer plate is an arc-shaped curved plate with a concave middle part, and the concave side of the arc-shaped curved plate faces the outer layer plate.

[0019] Further, both the first side plate and the second side plate are of the double-layer hollow structure;

[0020] The two outer layer plates are parallel to each other, the distance between the outer surfaces of the two outer layer plates is a1, the distance between the concave vertices of the two inner layer plates is a2, and 0 ≤ a2 / a1 < 1.

[0021] Compared with the prior art, the liquid cooling plate of the present utility model has the following advantages:

[0022] The liquid cooling plate provided by the present utility model designs at least one side plate in contact with the battery cell as a double-layer hollow structure, so that the side plate has a hollow cavity that can accommodate the expansion and deformation of the battery core. At the same time, this liquid cooling plate also retains the structural characteristics of the large-surface heat dissipation of the traditional liquid cooling plate and has excellent heat dissipation efficiency.

[0023] Another object of the present utility model is to propose a battery pack to improve the working reliability of the battery pack.

[0024] To achieve the above object, the technical solution of the present utility model is realized as follows:

[0025] The embodiment of the present utility model provides a battery pack, and the battery pack includes the aforementioned liquid cooling plate.

[0026] Further, the battery pack further includes a plurality of battery cells;

[0027] The plurality of battery cells are arranged in a straight line and stacked, the liquid cooling plate is disposed in the gap between adjacent battery cells, and the liquid cooling plate abuts against the largest surface of the battery cell.

[0028] The battery pack has the same advantages as the above liquid cooling plate compared with the prior art, and will not be elaborated herein.

[0029] Another object of the present utility model is to provide a vehicle to improve the reliability of the vehicle's electrical energy supply.

[0030] To achieve the above object, the technical solution of the present utility model is realized as follows:

[0031] A vehicle, the vehicle includes any one of the aforementioned battery packs.

[0032] The vehicle has the same advantages as the above battery pack compared with the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0034] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0035] Figure 2 is a cross-sectional schematic diagram of a liquid cooling plate according to an embodiment of the present utility model;

[0036] Figure 3 is a cross-sectional schematic diagram of the assembly contact between a liquid cooling plate and a battery cell according to an embodiment of the present utility model;

[0037] Figure 4 is a cross-sectional schematic diagram of another liquid cooling plate according to an embodiment of the present utility model.

[0038] DESCRIPTION OF THE REFERENCE NUMERALS:

[0039] 10 - liquid cooling plate, 10a - outer layer plate, 10b - inner layer plate, 101 - first side plate, 102 - second side plate, 103 - top plate, 104 - bottom plate, 11 - liquid cooling space, 111 - sub - space, 12 - hollow cavity, 13 - reinforcing rib, 20 - battery cell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0041] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0042] Referring to Figures 1 to 3 , an embodiment of the present utility model provides a liquid cooling plate 10, the liquid cooling plate 10 includes a first side plate 101 and a second side plate 102;

[0043] The first side plate 101 and the second side plate 102 are arranged opposite to each other, and a liquid cooling space 11 for accommodating the coolant is formed between the first side plate 101 and the second side plate 102;

[0044] Wherein, at least one of the first side plate 101 and the second side plate 102 is a double-layer hollow structure.

[0045] Figure 1 The internal structure of a battery pack according to an embodiment of the present invention is shown, in which a plurality of battery cells 20 are stacked side by side in the front and rear direction. A liquid cooling plate 10 is placed between two adjacent battery cells 20. The liquid cooling plate 10 is in contact with the large surfaces of the two battery cells 20 on both sides at the same time to cool and dissipate heat from them. The large surface of the battery cell 20 refers to the two larger area sides perpendicular to the thickness direction.

[0046] As Figure 2 shown, the liquid cooling plate 10 according to an embodiment of the present invention includes a first side plate 101 and a second side plate 102. The two side plates are arranged opposite to each other, and the liquid cooling space 11 in the middle is used to accommodate the coolant. Of course, the liquid cooling plate 10 may further include a top plate 103 arranged above in the height direction Z and a bottom plate 104 arranged below. The top plate 103 and the bottom plate 104 are arranged opposite to each other and are both connected to the first side plate 101 and the second side plate 102 to jointly form the outer shell structure of the liquid cooling plate 10. Combining Figure 2 with the schematic diagram, at least one of the above-mentioned first side plate 101 and second side plate 102 is a double-layer hollow structure with a cavity inside. For the battery cell 20, when it expands, it usually bulges in the middle part. Combining Figure 3 with the schematic diagram, it can be seen that when the battery cell 20 located on the side of the liquid cooling plate 10 expands, the bulging part of the battery cell 20 acts on the first side plate 101 or the second side plate 102, and the cavity of the corresponding side plate can provide a displacement space in the X direction for the bending deformation of the side plate, so that the expansion deformation of the battery cell 20 can be accommodated.

[0047] In addition, as Figure 3 shown in the schematic diagram, when the battery cell 20 is in the normal state without expansion and deformation, the battery cell 20 can be in contact with the side plate to form a solid heat transfer path, realizing the heat exchange between the liquid cooling plate 10 and the battery cell 20 and ensuring effective heat dissipation.

[0048] Therefore, for the liquid cooling plate 10 according to an embodiment of the present invention, at least one of the side plates in contact with the battery cell 20 is designed as a double-layer hollow structure, so that the side plate has a hollow cavity that can accommodate the expansion deformation of the battery core. At the same time, this liquid cooling plate 10 also retains the structural characteristics of the traditional liquid cooling plate for large surface heat dissipation and has excellent heat dissipation efficiency.

[0049] Furthermore, referring toFigure 2 The double-layer hollow structure includes an outer layer plate 10a and an inner layer plate 10b;

[0050] The inner layer plate 10b is located on the side of the outer layer plate 10a closer to the liquid cooling space 11;

[0051] Along the height direction of the liquid cooling plate 10, the upper and lower ends of the outer layer plate 10a and the inner layer plate 10b are connected, and a hollow cavity 12 is formed at intervals in the middle.

[0052] Specifically, as shown in Figure 2 In the schematic diagram, in the embodiment of the present invention, a double-layer hollow structure can be formed by the outer layer plate 10a and the inner layer plate 10b. The outer layer plate 10a and the inner layer plate 10b are arranged in parallel, and the inner layer plate 10b is located on the side of the outer layer plate 10a closer to the liquid cooling space 11, that is, on the inner side of the liquid cooling space 11. As shown in Figure 2 In the schematic diagram, along the height direction Z of the liquid cooling plate 10, the upper and lower ends of the outer layer plate 10a and the inner layer plate 10b are connected, and a hollow cavity 12 is formed at intervals in the middle. It can be understood that the cross-sectional shape of the hollow cavity 12 can be a rectangle, a crescent shape, etc., depending on the structure of the opposite surfaces of the outer layer plate 10a and the inner layer plate 10b. The embodiment of the present invention does not limit this. In addition, it should be noted that Figure 2 The schematic diagram shows the cross-section of the liquid cooling plate 10 in the embodiment of the present invention. At both ends in the direction perpendicular to the paper surface, there are also end plates connected to the two side plates, so that the liquid cooling space 11 is a closed space.

[0053] Furthermore, referring to Figure 2 Along the height direction of the liquid cooling plate 10, from the top and bottom of the liquid cooling plate 10 to the middle position, the distance between the outer layer plate 10a and the inner layer plate 10b gradually increases.

[0054] Specifically, as shown in Figure 2 In one embodiment, whether along the +Z direction shown in the figure, from the bottom of the liquid cooling plate 10 to the middle position, or along the -Z direction shown in the figure, from the top of the liquid cooling plate 10 to the middle position, the distance between the outer layer plate 10a and the inner layer plate 10b gradually increases. For example, in Figure 2 , along the +Z direction, the values gradually increase from d1 to d5, and along the -Z direction, the values gradually increase from d1' to d5. Thus, the middle part of the corresponding side plate can accommodate the expansion deformation of the battery cell 20 adjacent to it, and can fit better with the expansion form of the battery cell 20, reducing space waste.

[0055] Furthermore, referring to Figure 2, both the first side plate 101 and the second side plate 102 are of the double-layer hollow structure, and a reinforcing rib 13 is provided between the inner layer plates 10b of the first side plate 101 and the inner layer plates 10b of the second side plate 102.

[0056] As Figure 2 shown, in one embodiment, when both the first side plate 101 and the second side plate 102 are of the double-layer hollow structure, a reinforcing rib 13 can also be provided between the two inner layer plates 10b on the inner side. The reinforcing rib 13 connects and fixes the two inner layer plates 10b on both sides together, and can form a rigid support structure inside the liquid cooling plate 10, which helps to improve the structural stiffness of the liquid cooling plate 10.

[0057] Of course, in some embodiments, when the liquid cooling plate 10 is made of a single material, the first side plate 101, the second side plate 102, the top plate 103, the bottom plate 104 and the reinforcing rib 13 can be an integral part. For example, the liquid cooling plate 10 of the embodiment of the present utility model can be formed by extruding a blank in a mold into a structure with a cross-sectional shape as Figure 2 shown. The first side plate 101, the second side plate 102, the top plate 103, the bottom plate 104 and the reinforcing rib 13 of this liquid cooling plate 10 can all come from the same blank, such as an aluminum alloy bar or a blank of other composite materials. The structure of this liquid cooling plate 10 has better integrity, can reduce assembly processes such as welding, and helps to improve the sealing performance and assembly efficiency of the liquid cooling plate 10.

[0058] Further, referring to Figure 2 or Figure 4 , the reinforcing rib 13 is a straight one-shaped structure or a V-shaped structure.

[0059] As Figure 2 shown, in one embodiment, the reinforcing rib 13 of the embodiment of the present utility model can be a straight one-shaped structure. Specifically, the reinforcing rib 13 can be a rib plate with a large area. The length direction of the rib plate is perpendicular to the paper surface, and the width direction of the rib plate is the X direction shown in the figure. Along the width direction, one side of the rib plate is connected and fixed to one inner layer plate 10b, and the other side of the rib plate is connected and fixed to the other inner layer plate 10b. The reinforcing rib 13 can also be a frame with voids. Similar to the rib plate, the length direction of the frame is perpendicular to the paper surface, and the width direction of the frame is the X direction shown in the figure. Along the width direction, one side of the frame is connected and fixed to one inner layer plate 10b, and the other side of the frame is connected and fixed to the other inner layer plate 10b.

[0060] In addition, the reinforcing rib 13 can also be Figure 4The schematic V-shaped structure. The reinforcing rib 13 of the V-shaped structure may include two rib plates or frames forming an acute angle. When the battery cell 20 located on the side of the liquid cooling plate 10 expands, the bulging part of the battery cell 20 acts on the first side plate 101 or the second side plate 102, and the reinforcing rib 13 of the internal V-shaped structure can also converge and compress towards the middle, more sensitively responding to the expansion and deformation of the battery cell 20.

[0061] Further, referring to Figure 3 , along the height direction of the liquid cooling plate 10, a plurality of the reinforcing ribs 13 are arranged at intervals to divide the liquid cooling space 11 into a plurality of sub-spaces 111;

[0062] From the top and bottom of the liquid cooling plate 10 to the middle position, the height of each of the sub-spaces 111 gradually increases.

[0063] As Figure 3 shown, in one embodiment, the reinforcing rib 13 of the embodiment of the present invention may be multiple. The multiple reinforcing ribs 13 divide the liquid cooling space 11 into a plurality of sub-spaces 111 along the height direction Z of the liquid cooling plate 10, and the sub-spaces 111 may communicate with each other or be independently isolated. Combining Figure 2 shown, from the top and bottom of the liquid cooling plate 10 to the middle position, the height of each of the sub-spaces 111 gradually increases. For example, the height of the sub-spaces 111 near the top and bottom of the liquid cooling plate 10 is H2, and the height of the sub-spaces 111 near the middle position is H1, and H1 is greater than H2. Thus, a larger space can be formed in the middle part, which is more conducive to the middle part of the side plate adapting to the expansion and deformation of the battery cell 20.

[0064] Further, referring to Figure 2 , the inner layer plate 10b is an arc-shaped curved plate with an inward concave middle part, and the inward concave surface of the arc-shaped curved plate faces the outer layer plate 10a.

[0065] As Figure 2 shown, in one embodiment, the inner layer plate 10b of the embodiment of the present invention may be an arc-shaped curved plate with an inward concave middle part, and its concave surface faces the outer layer plate 10a, so that the hollow cavity 12 formed between the inner layer plate 10b and the outer layer plate 10a has a crescent-shaped cross-section. This kind of arc-shaped curved plate can avoid local stress concentration and help improve the mechanical strength of the liquid cooling plate 10.

[0066] Further, referring to Figure 2 , both the first side plate 101 and the second side plate 102 are of the double-layer hollow structure;

[0067] The two outer plates 10a are parallel to each other, the distance between the outer surfaces of the two outer plates 10a is a1, the distance between the concave vertices of the two inner plates 10b is a2, and 0 ≤ a2 / a1 < 1.

[0068] As Figure 2 shown, in the liquid cooling plate 10 of the embodiment of the present invention, when both the first side plate 101 and the second side plate 102 are double-layer hollow structures, both side plates may include an outer plate 10a and an inner plate 10b. The two outer plates 10a are flat planar plate members, the two outer plates 10a are parallel to each other, the distance between the outer surfaces of the two outer plates 10a is a1, and a1 is also the width of the entire liquid cooling plate 10. The distance between the concave vertices of the two inner plates 10b is a2, and a2 is the distance between the vertices of the opposite surfaces of the two inner plates 10b. When a2 = 0, that is, the two inner plates 10b are close together and the gap in the middle is 0. As long as a2 is greater than 0 and less than a1, it can ensure that there is a certain space between the two inner plates 10b, which can be used for the coolant to flow through and can further accommodate the inward extrusion deformation of the inner plates 10b. Therefore, 0 ≤ a2 / a1 < 1. For example, the value of a2 / a1 can be 0, 0.2, 0.3, 0.5, 0.6, 0.8, etc.

[0069] In addition, as Figure 2 shown, in some embodiments, when the distance a2 between the two inner plates 10b is too narrow, the flow resistance of the coolant is large and the heat dissipation efficiency is reduced. Therefore, a2 can be designed to be greater than or equal to 1 / 3 of the total width a1 of the liquid cooling plate 10. When the distance a2 between the two inner plates 10b is too wide, it is easy to excessively occupy the space for the expansion and deformation of the battery cell 20. Therefore, a2 is designed to be less than or equal to 2 / 3 of the total width a1 of the liquid cooling plate 10. For example, the value of a2 / a1 can be 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0070] The embodiment of the present invention also provides a battery pack, and the battery pack includes the aforementioned liquid cooling plate.

[0071] By using the aforementioned liquid cooling plate in the battery pack, based on the improvement of the liquid cooling plate, the working reliability of the battery pack can be further improved.

[0072] Furthermore, referring to Figure 1 , the battery pack further includes a plurality of battery cells 20;

[0073] The plurality of battery cells 20 are arranged in a straight line and stacked layer by layer, the liquid cooling plate 10 is disposed in the gap between adjacent battery cells 20, and the liquid cooling plate 10 abuts against the largest surface of the battery cell 20.

[0074] AsFigure 1 As shown in the figure, the battery pack of the embodiment of the present invention further includes a plurality of battery cells 20. The battery cells 20 may be in a cube shape, and the plurality of battery cells 20 are stacked in a straight line arrangement. The arrangement direction may be the direction consistent with the vehicle body length, such as Figure 1 the X direction shown in the figure. Along the X direction shown in the figure, a gap for installing the liquid cooling plate 10 is reserved between adjacent battery cells 20. The liquid cooling plate 10 can be inserted and fixed in this gap, and both sides of the liquid cooling plate 10 can be respectively abutted against the largest surfaces of battery cells 20 at different positions, so as to realize large-area heat dissipation and cooling with the battery cells 20.

[0075] In addition, the embodiment of the present invention further provides a vehicle, and the vehicle includes any one of the foregoing battery packs.

[0076] In the vehicle provided by the embodiment of the present invention, by using the battery pack of the foregoing embodiment as the power energy, the reliability of the vehicle's electric energy supply can be improved.

[0077] The foregoing are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: The liquid cooling plate comprises a first side plate and a second side plate; The first side plate and the second side plate are arranged opposite to each other, and a liquid cooling space for accommodating a coolant is formed between the first side plate and the second side plate; Wherein, at least one of the first side panel and the second side panel is a double-layer hollow structure.

2. The liquid cooling plate according to claim 1, characterized in that: The double-layer hollow structure comprises an outer plate and an inner plate; The inner plate is located on a side of the outer plate closer to the liquid cooling space; Along the height direction of the liquid cooling plate, the upper and lower ends of the outer plate and the inner plate are connected, and the middle is separated to form a hollow cavity.

3. The liquid cooling plate according to claim 2, characterized in that: Along the height direction of the liquid cooling plate, from the top and bottom to the middle position of the liquid cooling plate, the distance between the outer plate and the inner plate gradually increases.

4. The liquid cooling plate according to claim 2, characterized in that: The first side panel and the second side panel are both double-layer hollow structures, and reinforcing ribs are arranged between the inner layer panels of the first side panel and the inner layer panels of the second side panel.

5. The liquid cooling plate according to claim 4, characterized in that: The reinforcing rib is a straight I-shaped structure or a V-shaped structure.

6. The liquid cooling plate according to claim 4, characterized in that: Along the height direction of the liquid cooling plate, a plurality of reinforcing ribs are arranged at intervals to divide the liquid cooling space into a plurality of sub-spaces; The height of each of the subspaces gradually increases from the top and the bottom to the middle position of the liquid cooling plate.

7. The liquid cooling plate according to claim 3, characterized in that: The inner layer plate is an arc-shaped curved plate with a concave middle portion, and the concave side of the arc-shaped curved plate faces the outer layer plate.

8. The liquid cooling plate according to claim 7, characterized in that: The first side plate and the second side plate both have the double-layer hollow structure; The two outer plates are parallel to each other, the distance between the outer surfaces of the two outer plates is a1, the distance between the concave vertices of the two inner plates is a2, and 0≤a2 / a1<1.

9. A battery pack, characterized in that: The battery pack comprises the liquid cooling plate according to any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a plurality of battery cells; The plurality of battery cells are stacked and arranged in a straight line, the liquid cooling plate is arranged in the gap between the adjacent battery cells, and the liquid cooling plate abuts against the largest surface of the battery cells.

11. A vehicle, characterized in that: The vehicle comprises the battery pack according to claim 9 or 10.

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