Battery cell assembly and battery pack

Abstract

The utility model relates to power battery technical field especially relates to a kind of electric core subassembly and battery pack.Electric core subassembly includes: liquid cooling plate;Electric core unit, the electric core unit includes heat-conducting compression piece and electric core, at least part of the heat-conducting compression piece is located between the electric core and the liquid cooling plate, and the electric core and the liquid cooling plate are contacted and heat exchange by the heat-conducting compression piece;Wherein, the heat-conducting compression piece includes heat-conducting layer and elastic deformation layer, part of the heat-conducting layer is contacted with the liquid cooling plate, part of the heat-conducting layer is contacted with the electric core, the elastic deformation layer is located in the heat-conducting layer, and it is adapted to deform when the heat-conducting layer is contacted with the liquid cooling plate.Electric core unit with heat-conducting compression piece is contacted with liquid cooling plate, which is conducive to improving the fit between electric core unit and liquid cooling plate, thereby being conducive to improving heat exchange effect, and improving the product performance of electric core subassembly and battery pack.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a cell 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 plates to regulate their temperature. However, poor adhesion between the liquid cooling plate and the cell can easily occur, requiring adhesive bonding for fixation. This adhesive application is inconvenient, especially when the cell is cylindrical. The outer wall of a cylindrical cell is curved, making bonding between the liquid cooling plate and the cell even more difficult, requiring more precise adhesive application, and easily leading to problems such as scraping and insufficient adhesive in certain areas, resulting in poor bonding and affecting heat exchange efficiency. Utility Model Content

[0003] This utility model provides a cell assembly and battery pack to solve the technical problems of difficult bonding between the liquid cooling plate and the cell and high requirements for adhesive application, thereby improving the bonding degree between the liquid cooling plate and the cell, reducing the difficulty of adhesive application, improving heat exchange effect, and enhancing the product performance of the cell assembly and battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a battery cell assembly, comprising: Liquid cooling plate; A battery cell unit, the battery cell unit including a thermally conductive compression member and a battery cell, at least a portion of the thermally conductive compression member being located between the battery cell and the liquid cooling plate, and the battery cell and the liquid cooling plate contacting and exchanging heat through the thermally conductive compression member; The thermally conductive compression component includes a thermally conductive layer and an elastically deformable layer. A portion of the thermally conductive layer is in contact with the liquid cooling plate, and another portion of the thermally conductive layer is in contact with the battery cell. The elastically deformable layer is located within the thermally conductive layer and is adapted to deform when the thermally conductive layer is in contact with the liquid cooling plate.

[0005] In one embodiment of the present invention, the heat-conducting layer has a cylindrical structure, and the elastic deformation layer is located inside the cavity of the cylindrical structure.

[0006] In one embodiment of the present invention, the heat-conducting layer is sleeved on the outside of the battery cell, and the elastic deformation layer is sandwiched between the inner sidewall of the portion of the heat-conducting layer that contacts the liquid cooling plate and the outer sidewall of the battery cell. At least a portion of the inner sidewall of the portion of the heat-conducting layer that is offset from the elastic deformation layer contacts and exchanges heat with the outer sidewall of the battery cell.

[0007] In one embodiment of the present invention, the elastic deformation layer includes one or more compression blocks arranged at intervals.

[0008] In one embodiment of this utility model, the cross-section of the cylindrical structure is annular.

[0009] In one embodiment of the present invention, the battery cell is located outside the thermally conductive layer, and the elastic deformation layer is sandwiched between the inner wall of the portion of the thermally conductive layer that contacts the liquid cooling plate and the inner wall of the portion of the thermally conductive layer that contacts the outer wall of the battery cell.

[0010] In one embodiment of the present invention, the battery cell is in contact with the same liquid cooling plate through one or more spaced heat-conducting compression members.

[0011] In one embodiment of this utility model, the cross-section of the cylindrical structure is fan-shaped and annular.

[0012] In one embodiment of the present invention, the liquid cooling plate has a curved portion, the battery cell includes a cylindrical battery cell, and the concave surface of the curved portion is in contact with the outer wall of the cylindrical battery cell through the heat-conducting compression member.

[0013] In one embodiment of this utility model, the thickness of the elastic deformation layer is D1, where 1mm≤D1≤3mm.

[0014] 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.

[0015] In one embodiment of this utility model, the thickness of the thermally conductive layer is D2, where 0.01mm≤D2≤0.1mm.

[0016] 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.

[0017] In one embodiment of the present invention, an insulating layer is provided between the heat-conducting layer and the liquid cooling plate.

[0018] In one embodiment of the present invention, there are multiple liquid cooling plates, the battery cell unit is located between two adjacent liquid cooling plates, and the battery cell is in contact with the two adjacent liquid cooling plates through the heat-conducting compression member.

[0019] To achieve the above and other related objectives, this utility model also provides a battery pack, including the cell assembly described above.

[0020] The beneficial effects of this utility model are as follows: The battery cell assembly and battery pack proposed in this utility model have a battery cell unit with a thermally conductive compression component in contact with a liquid cooling plate, which is beneficial to improving the adhesion between the battery cell unit and the liquid cooling plate, thereby improving the heat exchange effect. Specifically, the thermally conductive layer of the thermally conductive compression component is in contact with both the battery cell and the liquid cooling plate, resulting in good heat exchange effect. Moreover, the thermally conductive layer is provided with an elastic deformation layer that can deform under force, so that when the thermally conductive layer comes into contact with the liquid cooling plate, the elastic deformation layer can be squeezed to adapt to deformation and fully adhere to the liquid cooling plate. This helps to reduce the impact of adhesive on the adhesion, reduces the difficulty of adhesion between the thermally conductive layer and the liquid cooling plate, and improves the product performance of the battery cell assembly and battery pack. Attached Figure Description

[0021] 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.

[0022] In the attached diagram: Figure 1 This is a partial structural schematic diagram of the battery cell assembly provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 A top view of the battery cell assembly; Figure 3 for Figure 1 A schematic diagram of the structure of the battery cell unit; Figure 4 for Figure 3 A bottom view of the battery cell unit; Figure 5 for Figure 3 Side view of the battery cell unit; Figure 6 This is a partial structural schematic diagram of the battery cell assembly provided in Embodiment 2 of this utility model; Figure 7 for Figure 6 A magnified schematic diagram of part A in the middle; Figure 8 for Figure 6 A magnified schematic diagram of part B in the middle; Figure 9 for Figure 6 A top view of the battery cell assembly.

[0023] The attached figures are labeled as follows: Liquid cooling plate 1, bending part 11, concave surface 111, battery cell unit 2, thermally conductive compression component 21, thermally conductive layer 211, cavity 2111, elastic deformation layer 212, compression block 2121, battery cell 22. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] See Figure 1 , Figure 3 and Figure 6 In some optional embodiments, the battery cell assembly provided by this utility model includes a liquid cooling plate 1 and a battery cell unit 2; in addition to the above-mentioned components, the battery cell assembly may also include an insulating layer (not shown in the figure). The battery cell unit 2 includes a thermally conductive compression member 21 and a battery cell 22. At least a portion of the thermally conductive compression member 21 is located between the battery cell 22 and the liquid cooling plate 1, and the battery cell 22 and the liquid cooling plate 1 contact and exchange heat through the thermally conductive compression member 21. The thermally conductive compression member 21 includes a thermally conductive layer 211 and an elastically deformable layer 212. A portion of the thermally conductive layer 211 contacts the liquid cooling plate 1, and another portion of the thermally conductive layer 211 contacts the battery cell 22. The elastically deformable layer 212 is located within the thermally conductive layer 211 and is adapted to deform when the thermally conductive layer 211 contacts the liquid cooling plate 1.

[0028] Optionally, the heat-conducting layer 211 may be in direct or indirect contact with the liquid cooling plate 1.

[0029] Optionally, the thermally conductive layer 211 may be in direct or indirect contact with the battery cell 22.

[0030] Optionally, the liquid cooling plate 1 has internal cooling channels for transporting cooling medium. When the liquid cooling plate 1 contacts the heat-conducting layer 211, it can remove the heat transferred from the battery cell 22 to the heat-conducting layer 211, thereby improving the heat exchange effect. Furthermore, the liquid cooling plate 1 includes an aluminum plate.

[0031] Optionally, the elastic deformable layer 212 is abutted or adhesively bonded to the thermally conductive layer 211. Further, the elastic deformable layer 212 and the thermally conductive layer 211 are bonded and fixed using PET (polyethylene terephthalate) double-sided adhesive.

[0032] Optionally, the heat-conducting layer 211 is abutted or glued to the liquid cooling plate 1. Further, the heat-conducting layer 211 and the liquid cooling plate 1 are glued and fixed together by PET double-sided adhesive.

[0033] Optionally, the thermally conductive layer 211 is abutted or glued to the battery cell 22. Further, the thermally conductive layer 211 and the battery cell 22 are bonded and fixed by PET double-sided adhesive or thermally conductive structural adhesive.

[0034] In the battery cell assembly of the above embodiment, the battery cell unit 2 with the thermally conductive compression member 21 contacts the liquid cooling plate 1, improving the fit between the battery cell unit 2 and the liquid cooling plate 1, enhancing the heat exchange effect, and reducing the assembly difficulty. Specifically, the thermally conductive layer 211 contacts both the battery cell 22 and the liquid cooling plate 1, which facilitates the transfer of heat from the battery cell 22 to the thermally conductive layer 211, and then to the liquid cooling plate 1, resulting in good heat exchange. In addition, the thermally conductive layer 211 contains an elastic deformation layer 212, which can deform under force. This allows the thermally conductive layer 211 to compress the elastic deformation layer 212 when in contact with the liquid cooling plate 1, adapting to the deformation and ensuring a high degree of fit. This results in more uniform and stable adhesive filling between the thermally conductive layer 211 and the liquid cooling plate 1, preventing adhesive scratches and localized missing adhesive that could affect product performance. The assembly difficulty is low, and the overall structural stability is maintained after bonding, thus improving the product performance of the battery cell assembly.

[0035] See Figure 1 , Figure 2 , Figure 6 and Figure 9 In some alternative embodiments, the thermally conductive layer 211 has a cylindrical structure, and the elastically deformable layer 212 is located inside the cavity 2111 of the cylindrical structure.

[0036] Optionally, the cross-section of the cylindrical structure is either circular or fan-shaped.

[0037] In the battery cell assembly of the above embodiment, the elastic deformation layer 212 is located inside the heat-conducting layer 211, and the heat-conducting compression member 21 is easy to deform, which is beneficial to improve the fit between the battery cell unit 2 and the liquid cooling plate 1, thereby improving the heat exchange efficiency.

[0038] See Figures 1 to 5 In some optional embodiments, the heat-conducting layer 211 is sleeved on the outside of the battery cell 22, and an elastic deformation layer 212 is sandwiched between the inner sidewall of the part of the heat-conducting layer 211 that contacts the liquid cooling plate 1 and the outer sidewall of the battery cell 22. At least a portion of the inner sidewall of the part of the heat-conducting layer 211 that is offset from the elastic deformation layer 212 contacts and exchanges heat with the outer sidewall of the battery cell 22.

[0039] Optionally, at least a portion of the inner sidewall of the thermally conductive layer 211 corresponding to the elastic deformation layer 212 is indirectly in contact with the outer sidewall of the battery cell 22 through the elastic deformation layer 212. The elastic deformation layer 212 can be compressed and deformed under force, resulting in a high degree of fit.

[0040] Optionally, at least a portion of the inner wall of the portion of the heat-conducting layer 211 that is offset from the elastic deformation layer 212 is in direct contact with the outer wall of the battery cell 22, so that the heat of the battery cell 22 can be quickly transferred to the heat-conducting layer 211, which is beneficial to improving the heat exchange efficiency.

[0041] Optionally, the elastic deformation layer 212 includes one or more spaced compression blocks 2121. The use of multiple spaced compression blocks 2121 in the elastic deformation layer 212 makes the compression blocks 2121 easier to deform, which is more conducive to improving the fit between the heat-conducting layer 211, the battery cell 22, and the liquid cooling plate 1, and the overall structural stability. Furthermore, the multiple compression blocks 2121 can be spaced apart along the circumference of the battery cell 22 or along the height of the battery cell 22.

[0042] Optionally, the cross-section of the cylindrical structure is annular.

[0043] The battery cell assembly in the above embodiment has a simple structure of thermally conductive compression component 21, and a high degree of fit between it and liquid cooling plate 1 and battery cell 22, which is beneficial to improving heat exchange effect and product performance.

[0044] See Figures 6 to 9 In some optional embodiments, the battery cell 22 is located outside the heat-conducting layer 211, and an elastic deformation layer 212 is sandwiched between the inner wall of the portion of the heat-conducting layer 211 that contacts the liquid cooling plate 1 and the inner wall of the portion of the heat-conducting layer 211 that contacts the outer wall of the battery cell 22.

[0045] Optionally, the battery cell 22 is in contact with the same liquid cooling plate 1 through one or more spaced heat-conducting compression members 21. Using multiple spaced heat-conducting compression members 21 makes the heat-conducting compression members 21 easier to deform, which is more conducive to improving the fit between the heat-conducting compression members 21 and the liquid cooling plate 1, as well as the fit between the heat-conducting compression members 21 and the battery cell 22, resulting in better heat exchange effect.

[0046] Optionally, the cross-section of the cylindrical structure is fan-shaped and annular.

[0047] Optionally, the elastic deformable layer 212 is abutted or adhesively connected to the battery cell 22. Further, the elastic deformable layer 212 and the battery cell 22 are bonded and fixed together using PET double-sided adhesive.

[0048] In the battery cell assembly of the above embodiment, the thermally conductive compression component 21 has a simple structure. Different parts of the thermally conductive layer 211 are in contact with the liquid cooling plate 1 and the battery cell 22, respectively, with high adhesion and good heat exchange effect.

[0049] See Figure 1 , Figure 2 , Figure 6 and Figure 9 In some alternative embodiments, the liquid cooling plate 1 has a bent portion 11, and the battery cell 22 includes a cylindrical battery cell. The concave surface 111 of the bent portion 11 is in contact with the outer wall of the cylindrical battery cell through a thermally conductive compression member 21. The sidewall shape of the thermally conductive compression member 21 facing the concave surface 111 of the bent portion 11 is adapted to the shape of the concave surface 111 of the bent portion 11, and the sidewall shape of the thermally conductive compression member 21 facing the outer wall of the cylindrical battery cell is adapted to the shape of the outer wall of the cylindrical battery cell.

[0050] Optionally, the liquid cooling plate 1 includes a serpentine plate with multiple bends 11, which are distributed and connected along the extension direction of the serpentine plate. Further, each bend 11 corresponds to one battery cell unit 2; that is, there can be multiple battery cell units 2 distributed along the extension direction of the serpentine plate.

[0051] Optionally, the curved portion 11 can be an arc-shaped structure or a bent structure.

[0052] In the battery cell assembly of the above embodiment, the liquid cooling plate 1 and the cylindrical battery cell can be fully bonded together through the thermally conductive compression component 21, resulting in high bonding degree, good structural stability, and good heat exchange effect.

[0053] See Figure 1 , Figure 2 , Figure 6 and Figure 9 In some optional embodiments, there are multiple liquid cooling plates 1, and the battery cell unit 2 is located between two adjacent liquid cooling plates 1. The battery cell 22 of the battery cell unit 2 contacts the two adjacent liquid cooling plates 1 through the heat-conducting compression member 21. The same battery cell unit 2 contacts two liquid cooling plates 1 for heat exchange, which is beneficial to improving the heat exchange effect and thus helping to meet the usage requirements.

[0054] See Figure 2 and Figure 9 In some optional embodiments, the thickness of the elastic deformation layer 212 is D1, where 1mm ≤ D1 ≤ 3mm.

[0055] Optionally, D1 can be any value among 1mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0056] In the battery cell assembly of the above embodiment, the elastic deformation layer 212 adopts a suitable thickness, which not only helps the elastic deformation layer 212 to deform smoothly under force, reducing the difficulty of deformation and improving the fit, but also makes the elastic deformation layer 212 have good support, which helps to improve the stability of the overall structure after bonding.

[0057] See Figure 1 and Figure 6 In some alternative embodiments, the elastic deformable layer 212 includes a foam layer.

[0058] Optionally, the elastic deformable layer 212 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 212 can be formed by one or more of the following foam layers: PU foam layer, silicone foam layer, EVA foam layer, EPE foam layer, and CR foam layer, arranged in a stacked manner.

[0059] In the battery cell assembly of the above embodiment, the elastic deformation layer 212 has good deformation capability, which is beneficial to improving the fit between the thermally conductive compression component 21, the liquid cooling plate 1 and the battery cell 22.

[0060] See Figure 2 and Figure 9 The thickness of the thermal conductive layer 211 is D2, 0.01mm≤D2≤0.1mm.

[0061] Optionally, D2 can be any value among 0.01mm, 0.03mm, 0.05mm, 0.08mm or 0.1mm.

[0062] In the battery cell assembly described above, the thermal conductive layer 211 has a suitable thickness and good thermal conductivity. In addition, the suitable thickness not only gives the thermal conductive layer 211 a certain deformation capability, but also ensures good stability after deformation, which is beneficial to improving the fit and the stability of the overall structure after bonding, thereby improving heat exchange stability and heat exchange efficiency.

[0063] See Figure 1 and Figure 6 In some alternative embodiments, the thermally conductive layer 211 includes a metal layer and / or a non-metal layer.

[0064] Optionally, the thermally conductive layer 211 includes one or more of an aluminum foil layer, a copper foil layer, and a thermally conductive graphite layer. Further, the thermally conductive layer 211 can be formed by one or more of the aluminum foil layer, copper foil layer, and thermally conductive graphite layer in a stacked arrangement.

[0065] Optionally, an insulating layer is provided between the heat-conducting layer 211 and the liquid-cooled plate 1, that is, the heat-conducting layer 211 and the liquid-cooled plate 1 are in indirect contact through the insulating layer; wherein, the insulating layer includes an insulating film, which not only ensures the insulation performance, but also helps to reduce the impact on the heat exchange efficiency and ensures the heat exchange effect.

[0066] In the battery cell assembly described above, the thermal conductive layer 211 has good thermal conductivity, which is beneficial to improving the heat exchange effect of the battery cell assembly.

[0067] See Figure 1 , Figure 3 and Figure 6 In some alternative embodiments, the present invention provides a battery pack that includes the cell assembly of any of the above embodiments.

[0068] The battery cell assembly and battery pack of this utility model have a heat-conducting compression component 21. Under the action of the heat-conducting compression component 21, the battery cell unit 2 can be fully attached to the liquid cooling plate 1, which reduces the assembly difficulty, improves the heat exchange effect, and enhances the product performance of the battery cell assembly and battery pack.

[0069] 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 battery cell assembly, characterized in that, include: Liquid cooling plate; A battery cell unit, the battery cell unit including a thermally conductive compression member and a battery cell, at least a portion of the thermally conductive compression member being located between the battery cell and the liquid cooling plate, and the battery cell and the liquid cooling plate contacting and exchanging heat through the thermally conductive compression member; The thermally conductive compression component includes a thermally conductive layer and an elastically deformable layer. A portion of the thermally conductive layer is in contact with the liquid cooling plate, and another portion of the thermally conductive layer is in contact with the battery cell. The elastically deformable layer is located within the thermally conductive layer and is adapted to deform when the thermally conductive layer is in contact with the liquid cooling plate.

2. The battery cell assembly according to claim 1, characterized in that, The thermally conductive layer has a cylindrical structure, and the elastically deformable layer is located inside the cavity of the cylindrical structure.

3. The cell assembly according to claim 2, characterized in that, The thermally conductive layer is sleeved on the outside of the battery cell. The elastic deformation layer is sandwiched between the inner wall of the portion of the thermally conductive layer that contacts the liquid cooling plate and the outer wall of the battery cell. At least a portion of the inner wall of the portion of the thermally conductive layer that is offset from the elastic deformation layer contacts and exchanges heat with the outer wall of the battery cell.

4. The cell assembly according to claim 3, characterized in that, The elastic deformation layer includes one or more spaced compression blocks.

5. The cell assembly according to claim 3, characterized in that, The cross-section of the cylindrical structure is annular.

6. The cell assembly according to claim 2, characterized in that, The battery cell is located outside the thermally conductive layer, and the elastic deformation layer is sandwiched between the inner wall of the portion of the thermally conductive layer that contacts the liquid cooling plate and the inner wall of the portion of the thermally conductive layer that contacts the outer wall of the battery cell.

7. The cell assembly according to claim 6, characterized in that, The battery cell is in contact with one or more thermally conductive compression members arranged at intervals between the same liquid cooling plate.

8. The cell assembly according to claim 6, characterized in that, The cross-section of the cylindrical structure is fan-shaped and annular.

9. The cell assembly according to claim 1, characterized in that, The liquid cooling plate has a curved portion, and the battery cell includes a cylindrical battery cell. The concave surface of the curved portion is in contact with the outer wall of the cylindrical battery cell through the heat-conducting compression member.

10. The cell assembly according to claim 1, characterized in that, The thickness of the elastic deformation layer is D1, where 1mm ≤ D1 ≤ 3mm.

11. The cell 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.

12. The cell assembly according to claim 1, characterized in that, The thickness of the thermally conductive layer is D2, where 0.01mm ≤ D2 ≤ 0.1mm.

13. The cell 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.

14. The cell assembly according to claim 13, characterized in that, An insulating layer is provided between the heat-conducting layer and the liquid cooling plate.

15. The cell assembly according to claim 1, characterized in that, The number of liquid cooling plates is multiple, and the battery cell unit is located between two adjacent liquid cooling plates. The battery cell is in contact with the two adjacent liquid cooling plates through the heat-conducting compression member.

16. A battery pack, characterized in that, Includes the cell assembly as described in any one of claims 1 to 15.

Images