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 liquid cooling plate body, and the widths of the top and the bottom of the liquid cooling plate body are larger than the width of the middle of the liquid cooling plate body in the height direction of the liquid cooling plate body. The heat conduction ribs are arranged on the surface of the liquid cooling plate body at intervals in the height direction of the liquid cooling plate body, and the heat conduction ribs are used for being in contact with the battery monomers for heat conduction. The liquid cooling plate provided by the embodiment of the utility model not only has excellent heat dissipation efficiency, but also can accommodate the expansion deformation of the battery monomers.

Description

Technical Field

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

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

[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 contact the large surface of the battery cells to dissipate heat. This liquid cooling plate is sandwiched in the gap between two adjacent battery cells and contacts the large surface of the battery cells. By increasing the contact area, the heat dissipation efficiency can be improved.

[0004] However, since the liquid cooling plate occupies the reserved expansion gaps 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 hindered. Utility Model Content

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

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] The present invention provides a liquid cooling plate, which comprises:

[0008] A liquid cooling plate body, wherein along the height direction of the liquid cooling plate body, the width of the top and bottom of the liquid cooling plate body is greater than the width in the middle;

[0009] The heat-conducting ribs are arranged on the surface of the liquid cooling plate body at intervals along the height direction of the liquid cooling plate body, and the heat-conducting ribs are used for contacting with the battery cells for heat conduction.

[0010] Furthermore, the liquid cooling plate body comprises:

[0011] A first cooling part, wherein a plurality of first cooling cavities are arranged in the first cooling part, and a cross section of the first cooling part is triangular;

[0012] A second cooling part, wherein a plurality of second cooling cavities are arranged in the second cooling part, and a cross section of the second cooling part is triangular;

[0013] The triangular vertices of the first cooling part and the second cooling part are arranged close to each other, and the heat conducting ribs are arranged on the surfaces of the first cooling part and the second cooling part.

[0014] Furthermore, along the height direction of the liquid cooling plate body, the first cooling part and the second cooling part are mirror-symmetrical in vertical direction.

[0015] Furthermore, the width of the connecting transition portion between the first cooling portion and the second cooling portion is a1, the total width of the liquid cooling plate body is a2, and 0≤a1 / a2<1.

[0016] Furthermore, a third cooling cavity is provided at a vertex transition portion between the first cooling portion and the second cooling portion.

[0017] Furthermore, along the height direction of the liquid cooling plate body, from the top or bottom of the liquid cooling plate body to the middle position, the extension length of the heat conducting ribs from the surface of the liquid cooling plate body gradually increases.

[0018] Furthermore, each of the heat conducting ribs extends from the surface of the liquid cooling plate body and terminates at the same reference plane, and the reference plane is parallel to the height direction of the liquid cooling plate body.

[0019] Compared with the prior art, the liquid cooling plate described in the utility model has the following advantages:

[0020] The liquid cooling plate provided by the utility model has a cross-sectional structure that is wide at the top and bottom and narrow in the middle along the height direction of the liquid cooling plate body. The liquid cooling plate of this shape provides space for the expansion and deformation of the battery cell. In addition, a plurality of heat-conducting ribs are arranged at intervals on the surface of the liquid cooling plate body. Since the heat-conducting ribs are spaced apart, the hollowed-out parts of the intervals can also allow the heat-conducting ribs to have space for deformation and movement. When the battery cell expands and deforms, the force of the battery cell acts on the heat-conducting ribs, and the heat-conducting ribs can bend and deform accordingly, which can avoid hindering the expansion of the battery cell. The heat-conducting ribs also serve as a heat-conducting structure between the battery cell and the liquid cooling plate body, and can conduct the heat of the battery cell to the liquid cooling plate body for heat dissipation. Therefore, the liquid cooling plate of the utility model embodiment has excellent heat dissipation efficiency and can accommodate the expansion and deformation of the battery cell.

[0021] Another object of the present invention is to provide a battery pack to improve the working reliability of the battery pack.

[0022] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0023] An embodiment of the utility model provides a battery pack, which includes the aforementioned liquid cooling plate.

[0024] Furthermore, the battery pack further comprises a plurality of battery cells;

[0025] 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.

[0026] Furthermore, a heat-conducting adhesive is provided between the liquid cooling plate body and the battery cell.

[0027] The advantages of the battery pack and the above-mentioned liquid cooling plate over the prior art are the same and will not be described in detail here.

[0028] Another object of the present invention is to provide a vehicle to improve the reliability of the vehicle's power supply.

[0029] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0030] A vehicle comprising any one of the aforementioned battery packs.

[0031] The advantages of the vehicle and the above-mentioned battery pack over the prior art are the same and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present utility model;

[0034] Figure 2 It is a cross-sectional schematic diagram of a liquid cooling plate according to an embodiment of the utility model;

[0035] Figure 3 It is a cross-sectional schematic diagram of a liquid cooling plate and a battery cell in contact with each other in an embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 10-liquid cooling plate, 101-liquid cooling plate body, 102-heat conducting ribs, 1011-first cooling part, 101a-first cooling cavity, 1012-second cooling part, 101b-second cooling cavity, 101c-third cooling cavity, 20-battery cell. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Reference Figures 1 to 3 The present utility model embodiment provides a liquid cooling plate 10, the liquid cooling plate 10 comprising:

[0041] The liquid cooling plate body 101, along the height direction Z of the liquid cooling plate body 101, the width of the top and bottom of the liquid cooling plate body 101 is greater than the width in the middle;

[0042] The heat-conducting ribs 102 are arranged on the surface of the liquid cooling plate body 101 at intervals along the height direction Z of the liquid cooling plate body 101 . The heat-conducting ribs 102 are used for contacting with the battery cells 20 for heat conduction.

[0043] Figure 1 The internal structure of a battery pack of an embodiment of the utility model is shown, wherein a plurality of battery cells 20 are stacked side by side front to back, and 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. The large surfaces of the battery cells 20 are the two side surfaces with larger areas perpendicular to the thickness direction.

[0044] like Figure 2 As shown, the liquid cooling plate 10 of the embodiment of the utility model includes a liquid cooling plate body 101 and a heat-conducting rib 102. Along the height direction Z of the liquid cooling plate body 101, the width of the top and bottom is larger than the width of the middle part. For the battery cell 20, when it expands, the middle part usually bulges. Therefore, when the battery cell 20 placed adjacent to the liquid cooling plate 10 expands, the recessed part in the middle of the liquid cooling plate body 101 can accommodate the expansion and deformation of the battery cell 20.

[0045] Furthermore, in order to ensure that the heat of the battery cell 20 can be effectively transferred to the liquid cooling plate body 101, a plurality of heat conducting ribs 102 are arranged at intervals on the surface of the liquid cooling plate body 101 along the height direction Z of the liquid cooling plate body 101. When the liquid cooling plate 10 is located in the gap between the adjacent battery cells 20, the end of the heat conducting rib 102 contacts the large surface of the battery cell 20, forming a solid heat transfer path, thereby realizing heat exchange between the liquid cooling plate 10 and the battery cell 20.

[0046] The liquid cooling plate 10 provided in the embodiment of the utility model has a cross-sectional structure that is wide at the top and bottom and narrow in the middle along the height direction of the liquid cooling plate body 101. The liquid cooling plate 10 of this shape structure provides a space for the expansion and deformation of the battery cell 20. In addition, a plurality of heat-conducting ribs 102 are arranged at intervals on the surface of the liquid cooling plate body 101. Since the heat-conducting ribs 102 are spaced apart, the hollowed-out parts of the intervals can also allow the heat-conducting ribs 102 to have deformation and activity space. When the battery cell 20 expands and deforms, when the force of the battery cell 20 acts on the heat-conducting ribs 102, the heat-conducting ribs 102 can bend and deform accordingly, which can avoid hindering the expansion of the battery cell 20. The heat-conducting ribs 102 also serve as a heat-conducting structure between the battery cell 20 and the liquid cooling plate body 101, and can conduct the heat of the battery cell 20 to the liquid cooling plate body 101 for heat dissipation.

[0047] In general, the liquid cooling plate body 101 is wide at the top and bottom, narrow in the middle, and has heat-conducting ribs 102 on the surface. Compared with the traditional liquid cooling plate with a rectangular cross-section, the liquid cooling plate can accommodate the expansion and deformation of the battery cell 20 and provide an effective large-surface heat dissipation path for the battery cell 20. Therefore, the liquid cooling plate of the embodiment of the utility model has excellent heat dissipation efficiency and can accommodate the expansion and deformation of the battery cell.

[0048] Further, refer to Figure 2 , the liquid cooling plate body 101 comprises:

[0049] A first cooling part 1011, wherein a plurality of first cooling chambers 101a are disposed in the first cooling part 1011, and a cross section of the first cooling part 1011 is triangular;

[0050] A second cooling part 1012, wherein a plurality of second cooling cavities 101b are disposed in the second cooling part 1012, and a cross section of the second cooling part 1012 is triangular;

[0051] The triangular vertices of the first cooling portion 1011 and the second cooling portion 1012 are arranged close to each other, and the heat conducting ribs 102 are arranged on the surfaces of the first cooling portion 1011 and the second cooling portion 1012 .

[0052] like Figure 2 As shown, the liquid cooling plate 10 of the embodiment of the utility model can place the metal blank in the mold cavity and extrude the structure. The liquid cooling plate body 101 can include a first cooling part 1011 and a second cooling part 1012, and the first cooling part 1011 and the second cooling part 1012 are distributed up and down along the height direction Z of the liquid cooling plate body 101.

[0053] A plurality of first cooling cavities 101a are formed in the first cooling portion 1011. In addition, along the height direction Z of the liquid cooling plate body 101, the plurality of first cooling cavities 101a may be separated by partitions or reinforcing ribs inside the liquid cooling plate body 101, and the plurality of first cooling cavities 101a are also connected to each other, and the coolant can flow through different first cooling cavities 101a from top to bottom or from bottom to top in sequence, gradually dissipating heat from different parts of the battery cell 20.

[0054] Similar to the first cooling part 1011, a plurality of second cooling cavities 101b are formed in the second cooling part 1012. In addition, along the height direction Z of the liquid cooling plate body 101, the plurality of second cooling cavities 101b may be separated by partitions or reinforcing ribs inside the liquid cooling plate body 101, and the plurality of second cooling cavities 101b are also connected to each other, and the coolant may flow through different second cooling cavities 101b from top to bottom or from bottom to top in sequence, gradually dissipating heat from different parts of the battery cell 20. Furthermore, each first cooling cavity 101a and each second cooling cavity 101b may also be connected to each other, and all cooling cavities share a liquid inlet and a liquid outlet.

[0055] Combination Figure 2 As shown in the figure, the cross-sections of the first cooling part 1011 and the second cooling part 1012 are both triangular. The two triangular cooling parts can be two independent cooling parts or an integrally connected structure. Regardless of the structural form, the vertices of the two triangles are arranged close to each other, or disconnected from each other, or connected as a whole, so as to form a liquid cooling plate body 101 that is wide at the top and bottom and narrow in the middle. At this time, the heat conducting ribs 102 are arranged on the sides of the first cooling part 1011 and the second cooling part 1012, extending outward from both sides of the liquid cooling plate body 101. It should be noted that when the vertices of the two triangular cooling parts are disconnected from each other, the two cooling parts can be installed and fixed at least by other connecting structures arranged outside the liquid cooling plate 10, and can also be clamped and fixed by the battery cells 20 on both sides. This embodiment of the utility model will not be described in detail.

[0056] Of course, in addition to the embodiment of the utility model Figure 2 The cross-sectional shape illustrated is a liquid cooling plate body 101 with two triangles connected together. Other liquid cooling plate bodies 101 that are wide at the top and bottom and narrow in the middle also belong to the shape structures protected by the embodiments of the present utility model. For example, the surface on which the heat conducting ribs 102 on the liquid cooling plate body 101 are arranged may also be a curved surface formed by a depression toward the cooling cavity inside the liquid cooling plate body 101.

[0057] Further, refer to Figure 2 Along the height direction Z of the liquid cooling plate body 101, the first cooling part 1011 and the second cooling part 1012 are mirror-symmetrical in the upper and lower directions.

[0058] like Figure 2 As shown, in the liquid cooling plate body 101 of the embodiment of the utility model, the first cooling part 1011 and the second cooling part 1012 can be of the same cross-sectional shape and size, and the two are mirror-symmetrical with respect to the middle connection part. At this time, the height of the first cooling part 1011 is H1, and the height of the second cooling part 1012 is H2, and the heights of the two each account for half of the total height of the liquid cooling plate body 101. The liquid cooling plate body 101 with such a symmetrical structure has simpler structural requirements for the extrusion molding die and lower processing and manufacturing costs.

[0059] Further, refer to Figure 2 , the width of the vertex transition portion between the first cooling portion 1011 and the second cooling portion 1012 is a1, the total width of the liquid cooling plate body 101 is a2, 0≤a1 / a2<1.

[0060] As described in the above-mentioned embodiment, in the liquid cooling plate body 101 of the embodiment of the utility model, the vertices of the two triangular cooling parts can be disconnected from each other. At this time, the width a1 of the vertex transition part of the first cooling part 1011 and the second cooling part 1012 is 0, so a1 / a2=0. If the vertices of the two triangular cooling parts are connected together, the ratio a1 / a2 of a1 to the total width a2 of the liquid cooling plate body 101 needs to be greater than 0. At the same time, in order to ensure that the expansion and deformation of the battery cell 20 can be accommodated in the middle part of the liquid cooling plate 10, a1 needs to be less than a2, so a1 / a2 also needs to meet the requirement of less than 1. For example, the value of a1 / a2 can be 0, 0.2, 0.3, 0.5, 0.6, 0.8, etc.

[0061] In addition, if Figure 2 As shown, in some embodiments, when the width a1 of the connection transition portion between the first cooling part 1011 and the second cooling part 1012 is too narrow, the connection strength of the first cooling part 1011 and the second cooling part 1012 is weak, and there is a risk of breakage. Therefore, the width a1 of the connection transition portion can also be designed to be greater than or equal to 1 / 3 of the total width a2 of the liquid cooling plate body 101. When the width a1 of the connection transition portion is too wide and thick, it is easy to excessively occupy the space for the battery cell 20 to expand and deform. Therefore, the width a1 of the connection transition portion is designed to be less than or equal to 2 / 3 of the total width a2 of the liquid cooling plate body 101. For example, the value of a1 / a2 can be 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0062] Further, refer to Figure 2 A third cooling cavity 101c is provided at the vertex transition portion between the first cooling portion 1011 and the second cooling portion 1012.

[0063] like Figure 2As shown, in the liquid cooling plate body 101 of the embodiment of the utility model, when the first cooling part 1011 and the second cooling part 1012 are connected as one, a third cooling cavity 101c can be provided at the vertex transition part of the first cooling part 1011 and the second cooling part 1012. The third cooling cavity 101c can be independently isolated from the first cooling cavity 101a and the second cooling cavity 101b, or can be connected thereto. By utilizing the third cooling cavity 101c in the middle part, the cooling space can be further increased, and the cooling efficiency of the liquid cooling plate 10 can be improved.

[0064] Further, refer to Figure 2 , along the height direction Z of the liquid cooling plate body 101 , from the top or bottom to the middle position of the liquid cooling plate body 101 , the extension length of the thermal conductive rib 102 from the surface of the liquid cooling plate body 101 gradually increases.

[0065] like Figure 2 As shown, in the liquid cooling plate body 101 of the embodiment of the utility model, along the height direction Z of the liquid cooling plate body 101, from the upper and lower ends to the middle, the extension lengths of the heat conducting ribs 102 gradually increase, that is, the closer the heat conducting ribs 102 are to the middle part of the liquid cooling plate body 101, the longer the lengths thereof. This ensures that each heat conducting rib 102 can effectively contact and transfer heat with the surface of the battery cell 20.

[0066] In addition, the heat conductive ribs 102 may be arranged to be inclined relative to the surface of the liquid cooling plate body 101 . The inclination direction is not limited in the embodiment of the utility model, so that the liquid cooling plate 10 can be inserted into the gap between adjacent battery cells 20 .

[0067] Further, refer to Figure 2 After extending from the surface of the liquid cooling plate body 101 , each of the heat conducting ribs 102 terminates at the same reference plane M, and the reference plane M is parallel to the height direction Z of the liquid cooling plate body 101 .

[0068] like Figure 2 As shown, the length of the heat conducting ribs 102 near the upper and lower ends of the liquid cooling plate body 101 is shorter, and the length of the heat conducting ribs 102 near the middle of the liquid cooling plate body 101 is longer. For the battery cell 20, its side is a plane. When the liquid cooling plate 10 and the battery cell 20 are assembled together, the side of the battery cell 20 can be located in the plumb direction. Figure 2 As shown in FIG. 1 , each heat conductive rib 102 extends from the surface of the liquid cooling plate body 101 and terminates at the same reference plane M, which can coincide with the side of the battery cell 20. In such a liquid cooling plate 10, the uniform structure of the heat conductive rib 102 is not only convenient for packaging and transporting the liquid cooling plate 10, but also convenient for assembling the liquid cooling plate 10 and the battery cell 20 in the subsequent assembly and manufacturing of the battery pack.

[0069] An embodiment of the utility model further provides a battery pack, which includes the aforementioned liquid cooling plate.

[0070] 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.

[0071] Further, refer to Figure 1 , the battery pack further includes a plurality of battery cells 20;

[0072] The plurality of battery cells 20 are stacked and arranged in a straight line, and the liquid cooling plate 10 is disposed in the gaps between the adjacent battery cells 20 . The liquid cooling plate 10 abuts against the largest surface of the battery cells 20 .

[0073] like Figure 1 The battery pack of the embodiment of the utility model further includes a plurality of battery cells 20. The battery cells 20 may be in a cubic shape. The plurality of battery cells 20 are stacked and arranged in a straight line. The direction of the arrangement may be consistent with the length of the vehicle body, such as Figure 1 The X direction is shown in the figure. Along the X direction, a gap is reserved between adjacent battery cells 20 for installing the liquid cooling plate 10. The liquid cooling plate 10 can be inserted and fixed in the gap. The two sides of the liquid cooling plate 10 can respectively abut against the maximum surface of the battery cells 20 at different positions, thereby achieving large-surface heat dissipation and cooling with the battery cells 20.

[0074] Furthermore, a thermally conductive adhesive is provided between the liquid cooling plate body 101 and the battery cell 20 .

[0075] Specifically, in one embodiment, in the battery pack, the gap between the liquid cooling plate body 101 and the battery cell 20 may be filled with thermal conductive adhesive. On the one hand, the thermal conductive adhesive can improve the efficiency of heat transfer and heat dissipation, and on the other hand, it can also fix the battery cell. Figure 3 As shown in FIG. 1 , the thermal conductive adhesive may be filled in the space enclosed by the adjacent thermal conductive ribs 102 and the surface of the battery cell 20 .

[0076] In addition, an embodiment of the utility model further provides a vehicle, the vehicle comprising any one of the aforementioned battery packs.

[0077] In the vehicle provided by the embodiment of the utility model, the reliability of the power supply of the vehicle can be improved by using the battery pack of the aforementioned embodiment as a power source.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: The liquid cooling plate comprises: A liquid cooling plate body, wherein along the height direction of the liquid cooling plate body, the width of the top and bottom of the liquid cooling plate body is greater than the width in the middle; The heat-conducting ribs are arranged on the surface of the liquid cooling plate body at intervals along the height direction of the liquid cooling plate body, and the heat-conducting ribs are used for contacting with the battery cells for heat conduction.

2. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate body comprises: A first cooling part, wherein a plurality of first cooling cavities are arranged in the first cooling part, and a cross section of the first cooling part is triangular; A second cooling part, wherein a plurality of second cooling cavities are arranged in the second cooling part, and a cross section of the second cooling part is triangular; The triangular vertices of the first cooling part and the second cooling part are arranged close to each other, and the heat conducting ribs are arranged on the surfaces of the first cooling part and the second cooling part.

3. The liquid cooling plate according to claim 2, characterized in that: Along the height direction of the liquid cooling plate body, the first cooling part and the second cooling part are mirror-symmetrical in vertical direction.

4. The liquid cooling plate according to claim 2, characterized in that: The width of the vertex transition portion between the first cooling portion and the second cooling portion is a1, the total width of the liquid cooling plate body is a2, and 0≤a1 / a2<1.

5. The liquid cooling plate according to claim 2, characterized in that: A third cooling cavity is provided at a vertex transition portion between the first cooling portion and the second cooling portion.

6. The liquid cooling plate according to claim 1, characterized in that: Along the height direction of the liquid cooling plate body, from the top or bottom of the liquid cooling plate body to the middle position, the extension length of the heat conducting ribs from the surface of the liquid cooling plate body gradually increases.

7. The liquid cooling plate according to claim 4, characterized in that: Each of the heat conducting ribs extends from the surface of the liquid cooling plate body and terminates at the same reference plane, and the reference plane is parallel to the height direction of the liquid cooling plate body.

8. A battery pack, characterized in that: The battery pack comprises the liquid cooling plate according to any one of claims 1 to 7.

9. The battery pack according to claim 8, 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.

10. The battery pack according to claim 9, characterized in that: A heat-conducting adhesive is arranged between the liquid cooling plate body and the battery cell.

11. A vehicle, characterized in that: The vehicle comprises the battery pack according to any one of claims 8 to 10.

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