Heating film assembly and battery pack

Abstract

The utility model provides a heating film assembly and a battery pack, the heating film assembly provided by the utility model is used for heating a battery module and comprises at least two heating films, and the two adjacent heating films are matched and connected through corresponding sockets and plugs; the socket and the plug are respectively connected to two adjacent heating films; the two heating films are partially overlapped when being electrically connected, and the plug between the two heating films at the overlapped position is inserted into the socket in the overlapping direction. According to the heating film assembly provided by the utility model, the plurality of heating films can be connected in series through the arrangement of the socket and the plug, and the plug and the socket are plugged along the overlapping direction of the heating films, so that the occupied space is smaller compared with the connection mode of a wire harness plug-in.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a heating film assembly. The utility model also relates to a battery pack equipped with the heating film assembly. Background Art

[0002] In cold conditions, the electrolyte in lithium-ion batteries becomes viscous, reducing the efficiency of ion conduction, which in turn affects the battery's charge and discharge performance and capacity. Heating films heat the battery modules within the battery pack, ensuring optimal performance and longevity in low-temperature environments.

[0003] Because the heating film needs to cover all the cells in the module, its area becomes very large. A common assembly method involves applying the heating film over a large area to the battery module using adhesive on one side. Applying the heating film over a large area affects the flatness and fit of the adhesive, and can easily leave small bubbles and hollows between the heating film and the battery module, preventing the heating film from contacting the module. This can cause temperature differences across the battery module and even dry-burning the heating film. To reduce the area required for a single application of the heating film, the heating film can be split into smaller pieces based on the size of the module.

[0004] However, after the heating film is split, a connection requirement will arise. The conventional heating film connection method is wire harness plug-in connection. Due to the cycle requirements of the battery cell, the height of the middle crossbeam needs to be more than 90% of the battery cell height. This results in a very small layout space for the wire harness plug-in. Therefore, holes have to be opened on the crossbeam of the shell to adapt to the installation of the wire harness plug-in. The connection between the heating films requires a large space. Utility Model Content

[0005] In view of this, the present invention aims to provide a heating film assembly to reduce the space required for connecting the heating films.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A heating film assembly for heating a battery module, comprising:

[0008] At least two heating films, two adjacent heating films being connected via corresponding sockets and plugs;

[0009] The socket and the plug are respectively connected to two adjacent heating films; the two heating films partially overlap when electrically connected, and the plug between the two heating films at the overlapping position is plugged into the socket along the overlapping direction.

[0010] Furthermore, the heating film assembly includes two end heating films and N middle heating films, where N ≥ 0;

[0011] The intermediate heating film comprises a film body, the socket and the plug; the film body has two connecting parts; the socket and the plug are respectively connected to the two connecting parts of the same intermediate heating film;

[0012] The end heating film includes the film body, the socket and / or the plug.

[0013] Furthermore, the plug is provided with a plurality of conductors extending outward, and the socket is provided with a jack. When the plug is plugged into the socket, the conductors are inserted into the jack to form conduction between the two heating films.

[0014] Furthermore, the connecting parts on the membrane body are arranged at opposite ends of the membrane body.

[0015] Furthermore, the membrane body is provided with a hollow portion penetrating along the thickness direction of the membrane body.

[0016] Furthermore, the hollow portion includes an elongated hole.

[0017] Furthermore, the hollow portion includes a long strip-shaped notch.

[0018] Furthermore, the film body includes a heating wire and an insulating film;

[0019] The heating wire is fixed between the two layers of the insulating film and is electrically connected to both the plug and the socket.

[0020] Compared with the existing technology, the heating film assembly of the utility model has the following advantages:

[0021] The heating film assembly of the present invention, by providing a socket and a plug, can connect multiple heating films in series. The plug and socket are connected along the overlapping direction of the heating films, which takes up less space than the connection method of the wiring harness plug-in. The heating film itself can replace the wiring harness and also provide heating, which can improve the heating efficiency of the heating film and also facilitate the installation of the plug and socket. The end heating film can be equipped with a plug and a socket, or with only a plug or a socket, and the overall shape of the heating film assembly can be maintained.

[0022] Secondly, multiple conductors are extended outward from the plug, which cooperate with the jacks on the socket to make the plug connection between the plug and the socket more secure and improve the current transmission effect. The connection parts are arranged at two opposite ends of the membrane body, which can facilitate the series connection between the heating films and connect multiple heating films in the same direction. The hollow part can be arranged to connect the battery module to the outside of the membrane body from the position of the hollow part. Structural adhesive can be applied to the position of the battery module corresponding to the hollow part to facilitate the connection between the battery module and the module strip in the battery pack, thereby improving the overall modality of the battery pack.

[0023] Furthermore, the elongated holes can accommodate elongated colloids, which provide a stronger connection. The elongated notches can accommodate the colloid, allowing for a tight connection to the module bead even at the edge of the battery module. The heating wire connected to the plug and socket can generate heat when powered, and the insulating film isolates the heating wire from other components within the battery pack, providing insulation and heat conduction to the heating wire.

[0024] Another object of the present invention is to provide a battery pack, wherein the battery pack is equipped with the heating film assembly as described above.

[0025] Furthermore, the heating film is adhered to the battery module of the battery pack.

[0026] Furthermore, the battery pack includes a shell, a crossbeam is provided in the shell, and the overlapping parts of the heating films are fixedly mounted on the crossbeam.

[0027] Furthermore, in the portion where the heating films overlap each other, the heating film on the lower side is bonded to the crossbeam.

[0028] Compared with the existing technology, the battery pack of the present invention has the following advantages:

[0029] The battery pack of the present invention utilizes the aforementioned heating film assembly, so the connection between the heating films occupies less space within the battery pack, thereby improving space utilization within the battery pack. Adhesive bonding of the heating films to the battery modules facilitates assembly, provides high connection strength, and improves heat transfer.

[0030] Secondly, the overlapping portion of the heating film is fixed to the crossbeam, which can take advantage of the smaller space above the crossbeam and improve the utilization rate of the battery pack space. The lower heating film is bonded to the crossbeam, which has a better connection strength and facilitates the plug and socket connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a structural diagram of the heating film assembly according to the first embodiment of the present invention;

[0033] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0034] Figure 3 This is a schematic structural diagram of the battery pack according to the second embodiment of the present invention;

[0035] Figure 4 for Figure 3 A partial enlarged view of part B in the middle.

[0036] Description of reference numerals:

[0037] 1. Membrane body;

[0038] 101, connecting portion; 102, hollow portion; 1021, elongated hole; 1022, notch;

[0039] 2. Socket;

[0040] 201, jack;

[0041] 3. Plug;

[0042] 301, conductor;

[0043] 4. Battery module;

[0044] 5. Shell;

[0045] 501. Beam. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0048] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] Example 1

[0051] This embodiment relates to a heating film assembly to reduce the space required for connecting between heating films.

[0052] In terms of overall structure, a heating film assembly in this embodiment is used to heat the battery module, and includes at least two heating films, and two adjacent heating films are connected through corresponding sockets and plugs.

[0053] The socket and the plug are respectively connected to two adjacent heating films. The two heating films partially overlap when electrically connected, and the plug between the two heating films at the overlapping position is plugged into the socket along the overlapping direction.

[0054] As described above, the heating film of this embodiment can be connected in series by providing a socket and a plug. The plug and socket are connected along the overlapping direction of the heating films, which takes up less space than the connection method of the wiring harness plug. The heating film itself can replace the wiring harness and also provide heating, which can improve the heating efficiency of the heating film and also facilitate the installation of the plug and socket.

[0055] Based on the above overall introduction, specifically, refer to Figure 1 and Figure 2 As shown, the heating film is a sheet that can be attached to the battery module 4 to heat the cells in the battery module 4, preventing the electrolyte in the cells from becoming too viscous and affecting the efficiency of ion conduction. Multiple heating films can be connected in series via their plugs 3 and sockets 2. The free plugs 3 and sockets 2 at both ends can be connected to the corresponding power supply circuits.

[0056] The heating film assembly includes two end heating films and N intermediate heating films, where N ≥ 0. The intermediate heating film comprises a film body 1, a socket 2, and a plug 3. The film body 1 has two connecting portions 101, and the socket 2 and plug 3 are respectively connected to the two connecting portions 101 of the same intermediate heating film. The end heating films comprise a film body 1, a socket 2, and / or a plug 3. Whether the end heating films are equipped with both the plug 3 and the socket 2, or with only the plug 3 or the socket 2, the overall shape of the heating film assembly is maintained and its use is not affected.

[0057] Specifically, the film body 1 includes a heating wire and an insulating film. The heating wire is fixed between two layers of insulating film and is electrically connected to both the plug 3 and the socket 2. The heating wire connecting the plug 3 and the socket 2 can generate heat when energized. The insulating film can isolate the heating wire from other parts in the battery pack, thereby achieving insulation of the heating wire and heat conduction to the heating wire. The heating wire can be a copper wire or a copper-nickel alloy wire, etc., as long as it can generate heat after being energized. Heating wires of different resistances can be selected according to the actual current passed into the heating film. In addition to meeting the insulation requirements, the insulating film also needs to have good high temperature resistance and heat transfer properties. Polyimide film or polyetheretherketone film can be used. In this embodiment, the preferred heating wire is a copper wire and the insulating film is a polyimide film.

[0058] Secondly, regarding the specific structure of the plug 3 and the socket 2, the plug 3 is provided with multiple conductors 301 extending outward, and the socket 2 is provided with a socket 201. When the plug 3 is plugged into the socket 2, the conductors 301 insert into the socket 201, establishing a conductive connection between the two heating films. The multiple conductors 301 extending outward from the plug 3 cooperate with the socket 201 on the socket 2. The conductors 301 can conduct the circuit within the socket 2 through the socket 201, achieving circuit conduction. The provision of multiple conductors 301 can make the plug-in connection between the plug 3 and the socket 2 more secure and improve the current transfer effect. In this embodiment, the conductors 301 on the plug 3 are arranged in a rectangular array, which provides good connection strength after connection to the socket 2 and is not easy to loosen.

[0059] Furthermore, regarding the arrangement of the plug 3 and the socket 2 relative to the membrane body 1, the connection portion 101 on the membrane body 1 of this embodiment is arranged at opposite ends of the membrane body 1, and the two connection portions 101 are respectively provided with a plug 3 and a socket 2. This arrangement facilitates the series connection between the heating membranes and connects multiple heating membranes in the same direction. Of course, the connection portion 101 can also be arranged at other positions on the membrane body 1, and the setting position of the connection portion 101 can be selected according to the specific setting position and arrangement of the heating membranes in the battery pack.

[0060] Furthermore, to facilitate assembly of the heating film within the battery pack, the film body 1 of this embodiment is provided with a hollow portion 102 extending through its thickness. The hollow portion 102 allows the battery module 4 to communicate upward with the outside of the film body 1 from the location of the hollow portion 102. Structural adhesive can be applied to the battery module 4 corresponding to the hollow portion 102 to facilitate connection between the battery module 4 and the module molding within the battery pack, improving the overall modality of the battery pack and thereby enhancing its structural strength.

[0061] Specifically, the hollow portion 102 includes an elongated hole 1021 and / or an elongated notch 1022. The elongated hole 1021 can accommodate an elongated colloid, which provides a stronger connection between the module bead and the battery module 4. The elongated notch 1022 can accommodate the colloid, allowing for a tight connection to the module bead even at the edge of the battery module 4. In this embodiment, the elongated hole 1021 is provided in the middle of the membrane 1, and notches 1022 are provided at both ends of the membrane 1 along the length of the elongated hole 1021, with two notches 1022 provided at each end.

[0062] The heating film of this embodiment can connect multiple heating films in series by providing a connecting portion 101 and providing a socket 2 and a plug 3 on the connecting portion 101. The plug 3 and the socket 2 are plugged in along the overlapping direction of the connecting portion 101, which takes up less space and is easy to assemble.

[0063] Example 2

[0064] This embodiment relates to a battery pack equipped with the heating film assembly of Embodiment 1. By installing the heating film assembly of Embodiment 1, the battery pack of this embodiment occupies less space within the battery pack due to the connection between the heating films, thereby improving space utilization within the battery pack.

[0065] Among them, for the specific arrangement of the heating film, refer to Figure 3 and Figure 4 As shown, the battery pack of this embodiment includes a housing 5, with a crossbeam 501 disposed therein. Two adjacent and connected heating films are fixedly mounted on the crossbeam 501 at their overlapping portions. The battery pack includes four groups of battery modules 4, each with a heating film disposed on the top. The heating films on adjacent battery modules 4 are connected along the length of the housing 5.

[0066] Existing heating films use wiring harness plug-ins to connect each other in series. However, the overall structure of the wiring harness plug-in is relatively large, requiring a large installation space. However, due to the cycling requirements of the battery cells, the height of the crossbeam 501 in the housing 5 needs to be at least 90% of the height of the battery cells to ensure the contact area between the crossbeam 501 and the battery cells. To achieve a better energy density, the space within the battery pack is relatively compact, and the wiring harness plug-in is usually placed on the crossbeam 501. However, due to the large size of the wiring harness plug-in, it is necessary to open a hole in the crossbeam 501 to arrange the wiring harness plug-in, making the installation process of the heating film relatively cumbersome. In addition, opening a hole in the crossbeam 501 will also affect the structural strength of the crossbeam 501.

[0067] In the battery pack of this embodiment, the connection structure of the heating film plug 3 and the socket 2 is relatively small in size and can be directly arranged on the top of the beam 501 without the need to drill holes in the beam 501. This not only reduces the use of space in the battery pack, but also simplifies the assembly method of the heating film and maintains the integrity of the beam 501. In the part where the two heating films overlap, the lower connection part 101 is bonded to the beam 501, which has good connection strength and facilitates the connection between the plug 3 and the socket 2. It can be understood that the connection part 101 where the plug 3 is located can be bonded to the beam 501, or the connection part 101 where the socket 2 is located can be bonded to the beam 501, both of which can ensure the connection between the plug 3 and the socket 2. In this embodiment, it is preferred to bond the connection part 101 where the plug 3 is located to the beam 501.

[0068] Regarding the connection method between the heating film and the battery module 4, the heating film of this embodiment is bonded to the battery module 4 of the battery pack. Bonding the heating film to the battery module 4 is convenient for assembly and has a high connection strength, while also having a good heat transfer effect. As for the material of the specific adhesive, a common heat-conducting adhesive such as a thermally conductive double-sided adhesive can be used. It should be noted that the heating film can also be connected to the battery module 4 in other ways, as long as the heat transfer between the heating film and the battery module 4 can be guaranteed, such as using a module pressure strip to press the heating film onto the battery module 4.

[0069] The battery pack of this embodiment is provided with the heating film of embodiment 1. The connection between the heating films occupies less space in the battery pack, which is beneficial to improving the space utilization rate in the battery pack. The hollow portion 102 is provided on the heating film, which also facilitates the connection between the battery module 4 and the module pressure strip, which is beneficial to improving the overall strength 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 replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating film assembly for heating a battery module, characterized in that: include: At least two heating films, two adjacent heating films being connected via corresponding sockets and plugs; The socket and the plug are respectively connected to two adjacent heating films; when the two heating films are electrically connected, they partially overlap, and the plug between the two heating films at the overlapping position is plugged into the socket along the overlapping direction.

2. The heating film assembly according to claim 1, characterized in that: It includes two end heating films and N middle heating films, where N ≥ 0; The intermediate heating film comprises a film body, the socket and the plug; the film body has two connecting parts; the socket and the plug are respectively connected to the two connecting parts of the same intermediate heating film; The end heating film includes the film body, the socket and / or the plug.

3. The heating film assembly according to claim 2, characterized in that: The plug is provided with a plurality of conductors extending outwards, and the socket is provided with a jack. When the plug is plugged into the socket, the conductors are inserted into the jack to form conduction between the two heating films; and / or, The connecting parts on the membrane body are arranged at opposite ends of the membrane body.

4. The heating film assembly according to claim 2, characterized in that: The membrane body is provided with a hollow portion penetrating along the thickness direction of the membrane body.

5. The heating film assembly according to claim 4, characterized in that: The hollow portion includes an elongated hole; and / or, The hollow portion includes a long strip-shaped notch.

6. The heating film assembly according to any one of claims 2 to 5, characterized in that: The film body includes a heating wire and an insulating film; The heating wire is fixed between the two layers of the insulating film and is electrically connected to both the plug and the socket.

7. A battery pack, characterized in that: The battery package is provided with the heating film assembly according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein: The heating film is adhered to the battery module of the battery pack.

9. The battery pack according to claim 7 or 8, characterized in that: The battery pack includes a shell, a crossbeam is provided in the shell, and the overlapping parts of the heating films are fixedly mounted on the crossbeam.

10. The battery pack according to claim 9, wherein: At a portion where the heating films overlap each other, the lower heating film is bonded to the crossbeam.

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