Battery cell insulation structure, battery module and battery pack

Abstract

The utility model provides a battery cell insulation structure, battery module and battery pack, the battery cell insulation structure of the utility model comprises an insulation film attached on a battery cell, a windowing part is formed on the insulation film, the battery cell is provided with a bonding part located at the windowing part, the insulation film comprises a first insulation film and a second insulation film, the battery cell is provided with a bottom surface, a top surface, two side surfaces and two end surfaces, the bottom surface and the top surface are oppositely arranged, a first insulating film is attached to each side surface, the first insulating film on each side is provided with an upper folding edge attached to the top surface and a lower folding edge attached to the bottom surface, and the second insulating film is attached to the top surface and at least partially covers the upper folding edge. According to the battery cell insulation structure disclosed by the utility model, the battery cell can be conveniently and reliably bonded on the battery box body through the bonding part at the windowing part, so that the insulation film is prevented from being stressed and stripped due to bonding, and the second insulation film covering the upper folding edge is arranged, so that the upper folding edge can be prevented from being warped and stripped, and the reliability of the battery cell insulation structure can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery insulation, and in particular to a battery core insulation structure. The utility model also relates to a battery module provided with the battery core insulation structure, and a battery pack provided with the battery module. Background Art

[0002] Insulation film is currently widely used in the field of lithium battery insulation due to its low cost and mature coating process and equipment. Between the existing battery cell insulation film and the battery box, a structural adhesive is usually provided on the insulation film to bond the battery cell to the battery box.

[0003] Since the insulating film usually adopts a single-layer or double-layer structure of pressure-sensitive adhesive and PET film, the bonding force on the battery cell is low. When the battery pack is subjected to mechanical vibration impact, the insulating film bonded with structural adhesive is prone to peeling on the surface of the battery cell or peeling between layers, thereby destroying the insulating structure on the surface of the battery cell.

[0004] For the existing insulating film with a window structure, a structural adhesive is placed on the cell surface corresponding to the window to prevent the insulating film from being bonded to the structural adhesive and peeling off due to force. However, the existing window structure is usually formed by the folded edges on the insulating film, and the folded edges on the insulating film are prone to warping and peeling off on the cell surface, thereby affecting the reliability of the cell insulation structure. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery cell insulation structure, so as to prevent the insulation film from peeling off on the surface of the battery cell, thereby improving the reliability of the battery cell insulation structure.

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

[0007] A battery cell insulation structure comprises an insulating film attached to the battery cell, wherein the insulating film is formed with a window portion located on the bottom surface of the battery cell, and the battery cell is provided with an adhesive portion located at the window portion, and the battery cell is adhered to a battery case through the adhesive portion; the insulating film comprises a first insulating film and a second insulating film, and the battery cell has a bottom surface and a top surface arranged oppositely, and two side surfaces arranged oppositely and two end surfaces arranged oppositely; the first insulating film is respectively attached to the side surfaces on each side, and the first insulating film on each side has an upper folded edge attached to the top surface, and a lower folded edge attached to the bottom surface, and the second insulating film is attached to the top surface and at least partially covers the upper folded edge.

[0008] Furthermore, the window opening portion includes a window arranged on the lower folded edge.

[0009] Furthermore, the shape of the window is one of a square hole, a round hole, and a long hole; and / or, the window is a plurality of windows arranged at intervals along the length direction of the bottom surface.

[0010] Furthermore, the insulating film includes a third insulating film respectively attached to two ends of the bottom surface, and the lower folded edges on both sides and the third insulating films at both ends together form the window portion.

[0011] Furthermore, each of the third insulating films covers the lower folded edge, and each of the third insulating films has a first side folded edge attached to the adjacent end surface or the side surface.

[0012] Furthermore, the width of the window portion is 75%-85% of the width of the bottom surface; and / or,

[0013] The area occupied by the bonding portion in the window portion is not less than 90% of the area of ​​the window portion.

[0014] Furthermore, a gap is formed between the upper folded edges on both sides, the second insulating film is attached to both ends of the top surface, and the second insulating film at each end has a second side folded edge attached to the adjacent end surface or the side surface.

[0015] Furthermore, the first insulating film has a third side fold attached to each of the end faces; and / or the bonding portion includes a structural adhesive provided at the window portion.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery cell insulation structure described in the utility model, by arranging a window portion on the insulation film, can facilitate the battery cell to be reliably bonded to the battery case through the adhesive portion at the window portion, so as to avoid the insulation film being bonded by the adhesive portion and being peeled off due to force. At the same time, by arranging a second insulation film covering the upper folded edge on the top surface, it is helpful to prevent the upper folded edge from warping and peeling off, thereby improving the reliability of the battery cell insulation structure.

[0018] In addition, the window provided on the lower folded edge can facilitate the formation of a window portion located on the bottom surface of the battery cell on the insulating film. The shape and arrangement of the window are designed according to actual needs to meet different usage requirements. The window portion is formed by enclosing the lower folded edge and the third insulating film at both ends, which can facilitate the formation of a window portion located on the bottom surface of the battery cell.

[0019] Secondly, the second insulating film covers both ends of the upper fold and has a second side fold, which is beneficial to improve the reliability of the upper fold attached to the top surface. At the same time, the upper fold and the second insulating film can also form a window, which is convenient for the battery cell to be bonded to the upper box body of the battery box, such as the upper cover, so as to improve the reliability of the connection between the battery cell and the battery box.

[0020] In addition, the third insulating film covers the lower fold and has a first side fold, which is conducive to improving the reliability of the lower fold attached to the bottom surface. By limiting the width and area ratio, it is conducive to ensuring the reliability of the bonding of the bonding part. By providing the third side fold, it is conducive to increasing the contact area between the first insulating film and each end surface and improving the reliability of the first insulating film attached to the battery cell.

[0021] Another object of the present invention is to provide a battery module, wherein at least some of the battery cells in the battery module are provided with the battery cell insulation structure as described above.

[0022] At the same time, the utility model also proposes a battery pack, on which the battery module as described above is provided.

[0023] The battery module and battery pack of the present invention have the same beneficial effects as the battery cell insulation structure described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 This is a schematic structural diagram of the insulation structure described in an embodiment of the utility model;

[0026] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0027] Figure 3 It is a partial schematic diagram of a second embodiment of the insulation structure described in the embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of a third embodiment of the insulation structure described in the embodiment of the utility model;

[0029] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0030] Figure 6 A structural schematic diagram of the insulation structure according to an embodiment of the utility model from another perspective;

[0031] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0032] Figure 8 for Figure 6 A partial schematic diagram of another embodiment of the present invention;

[0033] Fig. 9 It is a schematic diagram of the structure of the battery cell described in an embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Battery cell; 11. Bottom surface; 12. Top surface; 13. Side surface; 14. End surface; 2. Window portion; 3. First insulating film; 31. Upper folded edge; 32. Lower folded edge; 33. Window; 34. Third side folded edge; 4. Second insulating film; 41. Second side folded edge; 5. Third insulating film; 51. First side folded edge. DETAILED DESCRIPTION

[0036] 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.

[0037] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

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

[0040] Embodiment 1

[0041] This embodiment relates to a battery cell insulation structure (hereinafter referred to as insulation structure), which has an overall structure. Figures 1 to 9 As shown, the insulating structure includes an insulating film attached to the battery cell 1, on which a window portion 2 is formed on the bottom surface 11 of the battery cell 1, and a bonding portion is provided on the battery cell 1 at the window portion 2, and the battery cell 1 is bonded to the battery case through the bonding portion.

[0042] The insulating film of this embodiment includes a first insulating film 3 and a second insulating film 4 , and the battery cell 1 has a bottom surface 11 and a top surface 12 arranged opposite to each other, two side surfaces 13 arranged opposite to each other, and two end surfaces 14 arranged opposite to each other.

[0043] In addition, a first insulating film 3 is attached to each side surface 13, and each first insulating film 3 has an upper fold 31 attached to the top surface 12 and a lower fold 32 attached to the bottom surface 11. At the same time, the second insulating film 4 of this embodiment is attached to the top surface 12 and at least partially covers the upper fold 31.

[0044] As shown in the above structure, the insulating structure of this embodiment provides a window portion 2 on the insulating film, which can facilitate the battery cell 1 to be reliably bonded to the battery case through the adhesive portion at the window portion 2, so as to avoid the insulating film being bonded by the adhesive portion and peeled off due to force. At the same time, by providing a second insulating film 4 covering the upper folded edge 31 on the top surface 12, it is helpful to prevent the folded edge from warping and peeling off, thereby improving the reliability of the insulating structure.

[0045] Based on the above overall introduction, specifically, for the convenience of description and introduction of related content, this embodiment Fig. 9 The arrangement of each surface of the battery cell 1 is shown in the figure, and in the specific implementation, the insulating film adopts an insulating film product well known to those skilled in the art, such as PET film (Polyethylene terephthalate). At the same time, the battery box adopts an existing battery box or battery module box.

[0046] As a preferred embodiment, Figures 1 to 3 As shown, the window portion 2 of this embodiment includes a window 33 provided on the lower fold 32. At this time, the window 33 provided on the lower fold 32 can facilitate the formation of the window portion 2 located on the bottom surface 11 of the battery cell 1 on the insulating film.

[0047] In detail, the present embodiment uses a first insulating film 3 with a window 33 prefabricated thereon, and the lower fold 32 is located in the middle of the first insulating film 3, while the upper fold 31 is located at both ends. In specific implementation, the lower fold 32 of the first insulating film 3 with the window 33 is first attached to the bottom surface 11, and during the attachment operation, a positioning process well known to those skilled in the art is used to ensure that the center of the window 33 coincides with the center of the ground.

[0048] In this way, after the lower folded edge 32 is attached to the bottom surface 11, the two sides are folded and pasted on the two side surfaces 13, and then the upper folded edge 31 is folded and attached to the top surface 12. Finally, the second insulating film 4 is attached to the top surface 12 and covered on the upper folded edge 31 of the first insulating film 3.

[0049] In this embodiment, as a preferred implementation, the shape of the window 33 of this embodiment is one of a square hole, a round hole, and a long hole. In this way, the shape and arrangement of the window 33 are designed according to actual needs to meet different usage requirements.

[0050] Of course, in the specific implementation, in addition to using one of the square holes, round holes, and elongated holes, other shapes known to those skilled in the art, such as a runway shape, may also be used to prevent the lower fold edge 32 from warping and peeling off due to insufficient adhesion.

[0051] At the same time, in the specific implementation, the windows 33 of this embodiment are multiple and spaced apart along the length direction of the bottom surface 11. In this way, spaced window portions 2 can be formed on the bottom surface 11 of the battery cell 1, thereby facilitating improving the reliability of bonding between the battery cell 1 and the battery case.

[0052] In specific implementation, as an exemplary structure, the length of each window 33 of this embodiment is 40 mm to 50 mm, for example, 40 mm, 45 mm, 50 mm, or any value between 40 mm and 50 mm. In addition, the area of ​​the window portion 2 composed of each window 33 accounts for 50% of the area of ​​the bottom surface 11 to ensure the reliability of the bonding of the battery cell 1 to the battery box.

[0053] As a preferred embodiment, Figures 4 to 5 As shown, the insulating film of this embodiment includes a third insulating film 5 attached to both ends of the bottom surface 11, and the lower folded edges 32 on both sides and the third insulating films 5 at both ends together form a window portion 2. At this time, the window portion 2 is formed by the lower folded edge 32 and the third insulating films 5 at both ends, which can conveniently form the window portion 2 located on the bottom surface 11 of the battery cell 1.

[0054] In specific implementation, as an exemplary structure, the width of the third insulating film 5 accounts for 80% to 90% of the width of the bottom surface 11, so that the third insulating film 5 can be conveniently attached to both ends of the bottom surface 11, so as to ensure that the third insulating film 5 is firmly attached. At the same time, the third insulating film 5 is attached to the lower fold 32 and overlaps with the lower fold 32 by 2mm to 3mm, for example, 2mm, 2.5mm, 3mm, or any value between 2mm and 3mm can be used to ensure that the lower fold 32 and the third insulating film 5 enclose the window portion 2.

[0055] In this embodiment, as a preferred implementation, each third insulating film 5 covers the lower fold 32, and each third insulating film 5 has a first side fold 51 attached to the adjacent end surface 14 or side surface 13. Such a configuration is conducive to improving the reliability of the lower fold 32 being attached to the bottom surface 11.

[0056] In detail, as an exemplary structure, in this embodiment, the first side fold edge 51 of the third insulating film 5 adopts a width of 3mm to 5mm. In a specific implementation, for example, 3mm, 4mm, 5mm, or any value between 3mm and 5mm can be adopted to ensure that the third insulating film 5 can be firmly attached to the bottom surface 11 and prevent the third insulating film 5 from warping and peeling off.

[0057] As a preferred embodiment, the width of the window portion 2 is 75%-85% of the width of the bottom surface 11, for example, 75%, 80%, 85%, or any value between 75% and 85%. At this time, by limiting the width ratio, it is helpful to ensure the reliability of the bonding of the bonding part.

[0058] In this embodiment, preferably, the area occupied by the bonding portion in the window portion 2 is not less than 90% of the area of ​​the window portion 2, for example, 90%, 95%, 100%, or any value between 90% and 100%. By limiting the area ratio, it is also helpful to ensure the reliability of the bonding of the bonding portion.

[0059] In this embodiment, as a preferred implementation, Figures 6 to 8 As shown, a gap is formed between the upper folded edges 31 on both sides, and the second insulating film 4 is attached to both ends of the top surface 12, and each end of the second insulating film 4 has a second side folded edge 41 attached to the adjacent end surface 14 or side surface 13.

[0060] In this configuration, the second insulating film 4 covers both ends of the upper fold edge 31 and has a second side fold edge 41, which is beneficial to improving the reliability of the upper fold edge 31 being attached to the top surface 12. At the same time, the upper fold edge 31 and the second insulating film 4 can also form a window 33, which is convenient for bonding the battery cell 1 to the upper box body of the battery box, such as the upper cover, to improve the reliability of the connection of the battery cell 1 to the battery box.

[0061] In detail, as an exemplary structure, the second side fold 41 of the second insulating film 4 of this embodiment adopts the same width as the first side fold 51, which can also help ensure that the second insulating film 4 can be firmly attached to the side surface 13 or the end surface 14 to prevent the second insulating film 4 from warping and peeling off. By adopting the same width, the size specifications can be simplified for easy implementation.

[0062] In this embodiment, as a preferred implementation, Figure 8 As shown, the first insulating film 3 has a third side fold 34 attached to each end face 14. At this time, by providing the third side fold 34, it is beneficial to increase the contact area between the first insulating film 3 and each end face 14 and improve the reliability of the first insulating film 3 attached to the battery cell 1.

[0063] Specifically, the third side fold 34 of the first insulating film 3 of this embodiment also adopts the same width as the first side fold 51. In this embodiment, as a preferred implementation, the bonding portion includes a structural adhesive provided at the window portion 2. Specifically, the structural adhesive described in this embodiment can be an existing structural adhesive product.

[0064] The insulating structure of this embodiment, by providing the window portion 2 on the insulating film, can facilitate the battery cell 1 to be reliably bonded to the battery box through the bonding portion at the window portion 2, thereby preventing the insulating film from being bonded by the bonding portion and peeling off. At the same time, by providing the second insulating film 4 covering the upper folded edge 31 on the top surface 12, it is helpful to prevent the upper folded edge 31 from warping and peeling off, thereby improving the reliability of the insulating structure.

[0065] Embodiment 2

[0066] This embodiment relates to a battery module, in which at least part of the battery cells 1 of the battery module are provided with the insulation structure of the first embodiment. The structures not described in the battery module may refer to the existing structures.

[0067] The battery module of this embodiment can improve the reliability of the insulation of the battery cell 1 in the battery module by applying the insulation structure in the first embodiment, which is beneficial to improving the reliability of the insulation structure.

[0068] At the same time, this embodiment also relates to a battery pack, on which the above-mentioned battery module is arranged.

[0069] The battery pack of this embodiment, by adopting the above-mentioned battery module, can also help improve the reliability of the insulation structure and help ensure the stability and safety of the battery pack.

[0070] 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 battery cell insulation structure, characterized in that: The insulating film is attached to the battery cell, the insulating film is formed with a window portion located on the bottom surface of the battery cell, and the battery cell is provided with a bonding portion located at the window portion, and the battery cell is bonded to the battery box through the bonding portion; The insulating film comprises a first insulating film and a second insulating film, and the battery cell has a bottom surface and a top surface arranged opposite to each other, two side surfaces arranged opposite to each other, and two end surfaces arranged opposite to each other; The first insulating film is attached to the side surfaces on each side respectively, and the first insulating film on each side has an upper folded edge attached to the top surface and a lower folded edge attached to the bottom surface. The second insulating film is attached to the top surface and at least partially covers the upper folded edge.

2. The battery cell insulation structure according to claim 1, characterized in that: The window opening portion includes a window arranged on the lower folding edge.

3. The battery core insulation structure according to claim 2, characterized in that: The shape of the window is one of a square hole, a round hole, and a long hole; and / or, The windows are multiple and arranged at intervals along the length direction of the bottom surface.

4. The battery cell insulation structure according to claim 1, characterized in that: The insulating film includes a third insulating film respectively attached to two ends of the bottom surface, and the lower folded edges at both sides and the third insulating films at both ends together form the window portion.

5. The battery cell insulation structure according to claim 4, characterized in that: Each of the third insulating films covers the lower folded edge, and each of the third insulating films has a first side folded edge attached to the adjacent end surface or the side surface.

6. The battery core insulation structure according to claim 1, characterized in that: The width of the window portion is 75%-85% of the width of the bottom surface; and / or, The area occupied by the bonding portion in the window portion is not less than 90% of the area of ​​the window portion.

7. The battery cell insulation structure according to claim 1, characterized in that: A gap is formed between the upper folded edges on both sides, the second insulating film is attached to both ends of the top surface, and the second insulating film at each end has a second side folded edge attached to the adjacent end surface or the side surface.

8. The battery cell insulation structure according to any one of claims 1 to 7, characterized in that: The first insulating film has a third side fold attached to each of the end surfaces; and / or, The bonding portion includes a structural adhesive arranged at the window portion.

9. A battery module, characterized in that: At least some of the battery cells in the battery module are provided with the battery cell insulation structure according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery module according to claim 9.

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