Liquid cooling plate assembly and battery pack

Abstract

The utility model relates to a kind of liquid cooling plate assembly and battery pack of power battery technical field.The liquid cooling plate assembly includes: cold plate;Thermal conductive layer, the both sides of cold plate are arranged with thermal conductive layer;Elastic deformation layer, the gap between the first part of cold plate and the first part of thermal conductive layer is equipped with elastic deformation layer, elastic deformation layer is suitable for deforming and extending in gap when the first part of thermal conductive layer and battery cell contact, the second part of cold plate and the second part of thermal conductive layer directly contact and heat exchange.Cold plate and thermal conductive layer between being provided with the elastic deformation layer that can deform, so that thermal conductive layer has deformation space, it is conducive to the contact surface of thermal conductive layer deformation and battery cell adaptation, elastic deformation layer can fill at least part of gap after deformation, it is conducive to promote the stability of adhesion and contact;The second part of thermal conductive layer and cold plate directly contact heat exchange, guarantee the heat exchange effect, to guarantee the product performance of liquid cooling plate assembly and battery pack.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a liquid cooling plate assembly and battery pack. Background Technology

[0002] With the development of new energy technologies, battery applications are becoming increasingly widespread, and the performance requirements for batteries are also becoming higher. Battery cells generate heat during use, so they generally need to be cooled by liquid cooling plate assemblies to regulate their temperature. The liquid cooling plate assembly and the cell are typically fixed together with adhesive. Adhesive bonding is prone to problems such as glue scratching and missing adhesive, especially when the cell is cylindrical. The curved sidewalls of cylindrical cells make it difficult to bond the liquid cooling plate assembly to the cell, making glue scratching and missing adhesive issues even more pronounced. Utility Model Content

[0003] This utility model provides a liquid cooling plate assembly and a battery pack to solve the technical problem of difficult bonding between the liquid cooling plate assembly and the battery cell, thereby reducing the impact of glue scratches and local glue shortages on product performance and improving the product performance of the liquid cooling plate assembly and the battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a liquid-cooled plate assembly, comprising: Cold plate; A heat-conducting layer is provided on both sides of the cold plate; An elastic deformation layer is provided in the gap between the first part of the cold plate and the first part of the heat-conducting layer. The elastic deformation layer is adapted to deform and extend in the gap when the first part of the heat-conducting layer comes into contact with the battery cell. The second part of the cold plate is in direct contact with the second part of the heat-conducting layer and exchanges heat.

[0005] In one embodiment of the present invention, the cold plate includes a serpentine plate, the serpentine plate having a plurality of curved portions distributed along the extension direction of the serpentine plate, the first concave surfaces of two adjacent curved portions having opposite orientations, the plurality of first concave surfaces forming a first part of the cold plate, each curved portion having a first convex surface corresponding to the first concave surface, the plurality of first convex surfaces forming a second part of the cold plate.

[0006] In one embodiment of the present invention, the shape of the heat-conducting layer is adapted to the shape of the cold plate, the heat-conducting layer has a first sidewall facing the cold plate, the second convex surface of the first sidewall is disposed opposite to the first concave surface to form a first part of the heat-conducting layer, and the second concave surface of the first sidewall is disposed opposite to the first convex surface to form a second part of the heat-conducting layer.

[0007] In one embodiment of the present invention, the heat-conducting layer has a second sidewall facing away from the cold plate, the second sidewall has a third concave surface arranged opposite to the second convex surface, the third concave surface is covered with an insulating layer, and the third concave surface contacts and exchanges heat with the battery cell through the insulating layer.

[0008] In one embodiment of the present invention, each of the elastic deformation layers includes one or more compression blocks arranged at intervals.

[0009] In one embodiment of this utility model, the thickness of the elastic deformation layer is D1, where 1mm≤D1≤3mm.

[0010] In one embodiment of the present invention, the elastic deformation layer includes one or more of the following: PU foam layer, silicone foam layer, EVA foam layer, EPE foam layer, and CR foam layer.

[0011] In one embodiment of this utility model, the thickness of the thermally conductive layer is D2, where 0.01mm≤D2≤0.1mm.

[0012] In one embodiment of the present invention, the thermally conductive layer includes one or more of an aluminum foil layer, a copper foil layer, and a thermally conductive graphite layer.

[0013] To achieve the above and other related objectives, this utility model also provides a battery pack, including the liquid cooling plate assembly as described above.

[0014] The beneficial effects of this utility model are as follows: The liquid-cooled plate assembly and battery pack proposed in this utility model have a deformable elastic deformation layer between the cold plate and the heat-conducting layer. This allows the heat-conducting layer to have deformation space, which is beneficial for the deformation of the heat-conducting layer to adapt to the contact surface of the battery cell. After deformation, the elastic deformation layer can fill at least part of the gap, which helps to improve the adhesion and contact stability, ensure the adhesion between the adhesive and the heat-conducting layer and the battery cell, and help to avoid adhesive scratches and local missing adhesive, which would affect product performance. Based on this, the second part of the heat-conducting layer directly contacts the cold plate for heat exchange, ensuring the heat exchange effect, thereby ensuring the product performance of the liquid-cooled plate assembly and battery pack. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a partial structural schematic diagram of a liquid cooling plate assembly provided in an embodiment of the present invention; Figure 2 for Figure 1 Top view of the liquid cooling plate assembly.

[0017] The attached figures are labeled as follows: Cold plate 1, bending part 11, first concave surface 111, first convex surface 112, heat-conducting layer 2, first sidewall 21, second convex surface 211, second concave surface 212, second sidewall 22, third concave surface 221, elastic deformation layer 3, compression block 31, insulating layer 4, gap 5. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] See Figure 1 and Figure 2 In some alternative embodiments, the present invention provides a battery pack including a liquid cooling plate assembly.

[0022] Optionally, the battery pack also includes battery cells. Further, the battery cells include cylindrical cells, with the sidewalls of the liquid cooling plate assembly contacting and exchanging heat with the sidewalls of the cylindrical cells.

[0023] Optionally, there can be multiple cylindrical cells, arranged side-by-side to form multiple rows of cells, or multiple cylindrical cells arranged side-by-side to form multiple rows of cells. Each row of cells includes multiple cylindrical cells, and the liquid cooling plate assembly is located between two adjacent rows of cells. The liquid cooling plate assembly can simultaneously contact and exchange heat with two rows of cells, resulting in high heat exchange efficiency. This simplifies the structure and improves the energy density and performance of the battery pack. Furthermore, the extension direction of the liquid cooling plate assembly is the same as the arrangement direction of the multiple cylindrical cells in the same row of cells.

[0024] See Figure 1 and Figure 2 In some optional embodiments, the liquid cooling plate assembly provided by this utility model includes a cold plate 1, a heat-conducting layer 2, and an elastic deformation layer 3; in addition to the above-mentioned components, the liquid cooling plate assembly may also include an insulating layer 4. Heat-conducting layers 2 are arranged on both sides of the cold plate 1 along the arrangement direction of the multi-row battery cell assembly; an elastic deformation layer 3 is provided in the gap 5 between the first part of the cold plate 1 and the first part of the heat-conducting layer 2. The elastic deformation layer 3 is adapted to deform and extend within the gap 5 under force when the first part of the heat-conducting layer 2 contacts the battery cell. The second part of the cold plate 1 directly contacts and exchanges heat with the second part of the heat-conducting layer 2.

[0025] Optionally, the first part of the heat-conducting layer 2 is used for direct or indirect heat exchange with the battery cell. The liquid cooling plate assembly exchanges heat with the battery cell through the first part of the heat-conducting layer 2. When the first part of the heat-conducting layer 2 contacts the sidewall of the battery cell, the first part of the heat-conducting layer 2 abuts against the sidewall of the battery cell. The first part of the heat-conducting layer 2 is then deformed by the force from the battery cell, compressing the elastic deformation layer 3. The deformation of the elastic deformation layer 3 provides deformation space for the adaptive deformation of the heat-conducting layer 2.

[0026] Optionally, the cold plate 1 has cooling channels inside, which are used to transport cooling medium. When the cold plate 1 comes into contact with the heat-conducting layer 2, it can remove the heat transferred from the battery cell to the heat-conducting layer 2, thereby improving the heat exchange effect. Furthermore, the cold plate 1 includes an aluminum plate.

[0027] Optionally, the elastic deformable layer 3 is abutted or adhesively connected to the thermally conductive layer 2. Further, the elastic deformable layer 3 and the thermally conductive layer 2 are bonded and fixed together using PET (polyethylene terephthalate) double-sided adhesive.

[0028] Optionally, the elastic deformable layer 3 is abutted or glued to the cold plate 1. Further, the elastic deformable layer 3 is bonded to the cold plate 1 using PET double-sided adhesive.

[0029] In the liquid cooling plate assembly of the above embodiment, a gap 5 is provided between the first part of the cold plate 1 and the first part of the heat-conducting layer 2, so that the first part of the heat-conducting layer 2 can adaptively deform when in contact with the battery cell to improve the fit with the battery cell. The gap 5 and the elastic deformation layer 3 cooperate to provide deformation space for the heat-conducting layer 2, so that the heat-conducting layer 2 can adaptively deform to fit with the battery cell. Especially when the heat-conducting layer 2 contacts the uneven surface of the battery cell, such as when the heat-conducting layer 2 contacts the side wall of the cylindrical battery cell, the adaptive deformation of the first part of the heat-conducting layer 2 is beneficial to the fit between the first part of the heat-conducting layer 2 and the battery cell. The gap 5 between the cold plate 1 and the heat-conducting layer 2 is provided with an elastic deformation layer 3 that can deform and extend under force. The shape layer 3 can adaptably deform to provide deformation space for the deformation of the heat-conducting layer 2 and can fill at least part of the gap 5 to improve the stability of the overall structure. This helps the first part of the heat-conducting layer 2 to maintain a stable shape and improve the fit when it comes into contact with the battery cell after deformation. It also ensures that the adhesive applied between the heat-conducting layer 2 and the battery cell can be more uniform and stable, which helps to avoid adhesive scratching and local missing adhesive, thus affecting product performance. In addition, the second part of the heat-conducting layer 2 directly contacts the cold plate 1 for heat exchange, so that the heat transferred from the battery cell to the first part of the heat-conducting layer 2 can be exchanged with the cold plate 1 through the second part of the heat-conducting layer 2, ensuring the cooling effect of the liquid cooling component and thus improving product performance.

[0030] See Figure 1 and Figure 2 In some alternative embodiments, the cold plate 1 includes a serpentine plate having a plurality of curved portions 11 distributed along the extension direction of the serpentine plate, the first concave surfaces 111 of two adjacent curved portions 11 having opposite orientations, the plurality of first concave surfaces 111 forming a first part of the cold plate 1, each curved portion 11 having a first convex surface 112 corresponding to the first concave surface 111, the plurality of first convex surfaces 112 forming a second part of the cold plate 1.

[0031] Optionally, the curved portion 11 has an arc-shaped structure or a bent structure, and each curved portion 11 corresponds to one battery cell. At least a portion of the sidewall of the curved portion 11 facing the corresponding battery cell is formed as a first concave surface 111 of the curved portion 11, and at least a portion of the sidewall of the curved portion 11 facing away from the corresponding battery cell is formed as a first convex surface 112 of the curved portion 11. Further, an elastic deformation layer 3 is provided between each first concave surface 111 and the heat-conducting layer 2.

[0032] Optionally, the extension direction of the serpentine plate is the same as the arrangement direction of the multiple cylindrical cells in each row of cells.

[0033] Optionally, the shape of the heat-conducting layer 2 is adapted to the shape of the cold plate 1. That is, the heat-conducting layer 2 can be a serpentine structure. The heat-conducting layer 2 has a first sidewall 21 facing the cold plate 1. The second convex surface 211 of the first sidewall 21 is arranged opposite to the first concave surface 111 to form the first part of the heat-conducting layer 2. That is, the second convex surface 211 faces the elastic deformation layer 3. The second concave surface 212 of the first sidewall 21 is arranged opposite to the first convex surface 112 to form the second part of the heat-conducting layer 2. That is, the second concave surface 212 faces the first convex surface 112 and directly contacts the first convex surface 112 for heat exchange.

[0034] Optionally, the heat-conducting layer 2 has a second sidewall 22 facing away from the cold plate 1, or in other words, the second sidewall 22 faces the battery cell. The second sidewall 22 has a third concave surface 221 arranged opposite to the second convex surface 211, that is, the third concave surface 221 faces the corresponding battery cell. The third concave surface 221 is covered with an insulating layer 4, and the third concave surface 221 contacts the battery cell for heat exchange through the insulating layer 4. Furthermore, the insulating layer 4 includes an insulating film, which not only ensures insulation performance but also helps to reduce the impact on heat exchange efficiency, thus ensuring the heat exchange effect. In this case, the second sidewall 22 of the heat-conducting layer 2 is completely covered by the insulating layer 4, making the insulation more stable and reliable.

[0035] In the liquid-cooled plate assembly of the above embodiment, the cold plate 1 can exchange heat with multiple battery cells simultaneously, resulting in high heat exchange efficiency and helping to meet heat exchange requirements.

[0036] See Figure 1 and Figure 2 In some optional embodiments, each elastic deformation layer 3 includes one or more spaced compression blocks 31. The use of multiple spaced compression blocks 31 in the elastic deformation layer 3 makes the compression blocks 31 easier to deform, which is more conducive to improving the adhesion between the heat-conducting layer 2 and the battery cell and the stability of the overall structure. Furthermore, the multiple compression blocks 31 can be spaced along the extension direction of the serpentine plate, or the multiple compression blocks 31 can be spaced along the height direction of the serpentine plate.

[0037] See Figure 2 In some optional embodiments, the thickness of the elastic deformation layer 3 is D1, where 1mm ≤ D1 ≤ 3mm.

[0038] Optionally, D1 can be any value among 1mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0039] In the liquid cooling plate assembly of the above embodiment, the elastic deformation layer 3 adopts a suitable thickness, which not only helps the elastic deformation layer 3 to deform smoothly under force and reduces the difficulty of deformation, but also makes the elastic deformation layer 3 have good support, which helps to improve the adhesion between the heat conduction layer 2 and the battery cell and the stability of the overall structure after adhesion.

[0040] See Figure 1 and Figure 2 In some alternative embodiments, the elastic deformation layer 3 includes a foam layer.

[0041] Optionally, the elastic deformable layer 3 includes one or more of the following: PU (polyurethane, abbreviated as PU) foam layer, silicone foam layer, EVA (ethylene vinyl acetate, abbreviated as EVA) foam layer, EPE (expandable polyethylene, abbreviated as EPE) foam layer, and CR (chloroprene rubber, abbreviated as CR) foam layer. Further, the elastic deformable layer 3 can be formed by one or more of the following: PU foam layer, silicone foam layer, EVA foam layer, EPE foam layer, and CR foam layer, arranged in a stacked manner.

[0042] In the liquid cooling plate assembly of the above embodiment, the elastic deformation layer 3 has good deformation capability, which is beneficial to improving the adhesion between the heat-conducting layer 2 and the battery cell.

[0043] See Figure 2 In some optional embodiments, the thickness of the thermally conductive layer 2 is D2, where 0.01mm ≤ D2 ≤ 0.1mm.

[0044] Optionally, D2 can be any value among 0.01mm, 0.03mm, 0.05mm, 0.08mm or 0.1mm.

[0045] In the liquid cooling plate assembly of the above embodiment, the thermally conductive layer 2 has a suitable thickness and good thermal conductivity. In addition, the suitable thickness not only gives the thermally conductive layer 2 a certain deformation capability, but also enables it to have good stability after deformation. This is beneficial to improving the adhesion between the thermally conductive layer 2 and the battery cell and the stability of the overall structure after adhesion, thereby improving the heat exchange stability and heat exchange efficiency.

[0046] See Figure 1 and Figure 2 In some alternative embodiments, the thermally conductive layer 2 includes a metal layer and / or a non-metal layer.

[0047] Optionally, the thermally conductive layer 2 includes one or more of an aluminum foil layer, a copper foil layer, and a thermally conductive graphite layer. Further, the thermally conductive layer 2 can be formed by one or more of the aluminum foil layer, copper foil layer, and thermally conductive graphite layer in a stacked arrangement.

[0048] In the liquid cooling plate assembly of the above embodiment, the heat-conducting layer 2 has good heat conduction effect, which is beneficial to improving the heat exchange effect of the liquid cooling plate assembly.

[0049] The liquid-cooled plate assembly and battery pack of this utility model, in which the cold plate 1, elastic deformation layer 3 and heat-conducting layer 2 of the liquid-cooled plate assembly work together to improve the fit and stability of the contact between the liquid-cooled plate assembly and the battery cell, helps to avoid the impact on product performance due to glue scratches and local glue shortages, ensures heat exchange effect, and improves the product performance of the liquid-cooled plate assembly and battery pack.

[0050] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A liquid-cooled plate assembly, characterized in that, include: Cold plate; A heat-conducting layer is provided on both sides of the cold plate; An elastic deformation layer is provided in the gap between the first part of the cold plate and the first part of the heat-conducting layer. The elastic deformation layer is adapted to deform and extend in the gap when the first part of the heat-conducting layer comes into contact with the battery cell. The second part of the cold plate is in direct contact with the second part of the heat-conducting layer and exchanges heat.

2. The liquid-cooled plate assembly according to claim 1, characterized in that, The cold plate includes a serpentine plate having a plurality of curved portions distributed along the extension direction of the serpentine plate, the first concave surfaces of two adjacent curved portions facing opposite directions, the plurality of first concave surfaces forming a first part of the cold plate, each curved portion having a first convex surface corresponding to the first concave surface, the plurality of first convex surfaces forming a second part of the cold plate.

3. The liquid-cooled plate assembly according to claim 2, characterized in that, The shape of the heat-conducting layer is adapted to the shape of the cold plate. The heat-conducting layer has a first sidewall facing the cold plate. The second convex surface of the first sidewall is disposed opposite to the first concave surface to form a first part of the heat-conducting layer. The second concave surface of the first sidewall is disposed opposite to the first convex surface to form a second part of the heat-conducting layer.

4. The liquid-cooled plate assembly according to claim 3, characterized in that, The heat-conducting layer has a second sidewall facing away from the cold plate, and the second sidewall has a third concave surface arranged opposite to the second convex surface. The third concave surface is covered with an insulating layer, and the third concave surface exchanges heat with the battery cell through the insulating layer.

5. The liquid-cooled plate assembly according to claim 1, characterized in that, Each of the elastic deformation layers includes one or more spaced compression blocks.

6. The liquid-cooled plate assembly according to claim 1, characterized in that, The thickness of the elastic deformation layer is D1, where 1mm ≤ D1 ≤ 3mm.

7. The liquid-cooled plate assembly according to claim 1, characterized in that, The elastic deformation layer includes one or more of the following: PU foam layer, silicone foam layer, EVA foam layer, EPE foam layer, and CR foam layer.

8. The liquid-cooled plate assembly according to claim 1, characterized in that, The thickness of the thermally conductive layer is D2, where 0.01mm ≤ D2 ≤ 0.1mm.

9. The liquid-cooled plate assembly according to claim 1, characterized in that, The thermally conductive layer includes one or more of an aluminum foil layer, a copper foil layer, and a thermally conductive graphite layer.

10. A battery pack, characterized in that, Includes the liquid-cooled plate assembly as described in any one of claims 1 to 9.

Images