Self-adaptive heating film

Abstract

The utility model belongs to the field of batteries, and provides a self-adaptive heating film, which comprises insulating films and a resistance wire, two ends of the resistance wire are respectively provided with a wire harness and a terminal connected with the wire harness, the insulating films are divided into two layers and are oppositely distributed front and back, one side of each insulating film is provided with a back adhesive layer used for bonding a battery cell, and the other side of each insulating film is provided with a back adhesive layer. A resistance wire is arranged between the two layers of insulating films, a plurality of deformation sections which are uniformly distributed at intervals are arranged on the insulating films, a plane section is arranged between every two adjacent deformation sections, the deformation sections on the two layers of insulating films are oppositely distributed front and back, and bent sections are arranged at the positions, corresponding to the deformation sections, of the resistance wire. And the bending section and the deformation section are not in contact with the battery cell. According to the heating film, the deformation section and the bending section form a self-adaptive structure of the heating film, so that the actual length of the heating film can be freely stretched according to the expansion degree of a battery cell, the heating film is ensured to be always attached to the surface of the battery cell, and the tearing risk is avoided, so that the longer actual service life and the higher utilization rate are obtained.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to an adaptive heating film. Background Art

[0002] With the development of new energy technologies, battery thermal management has received more and more attention. In low temperature environments, in order to ensure normal charging and discharging of batteries, the battery cells need to be heated. The industry usually adopts heating film or liquid heating solutions. Among them, the heating film solution is adopted by more and more battery manufacturers due to its simple structure and outstanding cost advantages.

[0003] The heating film is usually adhered to the surface of the battery cell by adhesive backing. The heating film is in a flat state. As the battery cell charge and discharge cycle proceeds, the battery cell will expand and deform. The general heating film does not have an arched adaptive structure. The side of the battery cell and the heating film are sheared, resulting in relative slip between the heating film and the battery cell, making it impossible for the heating film to fully fit the surface of the battery cell, and even causing the heating film resistance wire to tear, causing the heating film to fail, reducing the utilization rate of the heating film. Utility Model Content

[0004] In view of the technical problems existing in the heating film for heating the above-mentioned battery cells, the utility model proposes an adaptive heating film. By designing an arch structure on the heating film, the length of the heating film can be freely expanded or contracted according to the expansion degree of the battery cell, ensuring that the heating film always fits the surface of the battery cell without any risk of tearing, thereby obtaining a longer actual service life and a higher utilization rate.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the utility model provides an adaptive heating film, including an insulating film and a resistance wire, both ends of the resistance wire are provided with a wiring harness and a terminal connected to the wiring harness, the insulating film has two layers and is relatively distributed front and back, one side of the insulating film is provided with a back adhesive layer for bonding the battery cell, the resistance wire is used to be arranged between the two layers of the insulating film, a plurality of deformation segments evenly spaced are provided on the insulating film, and a plane segment is between adjacent deformation segments, the deformation segments on the two layers of the insulating film are relatively distributed front and back, and the resistance wire is provided with a bending segment at a position corresponding to the deformation segment, and the bending segment and the deformation segment are not in contact with the battery cell.

[0006] Preferably, the cross section of the deformation section is in the shape of an arc.

[0007] Preferably, the resistance wire includes a straight segment, and the straight segment is provided with a plurality of planar serpentine segments connected end to end at one end away from the terminal connected to it, and the area where each planar serpentine segment is located is opposite to the front and back of the planar segment, and curved segments are provided on the straight segment and between adjacent planar serpentine segments, and the last end of the planar serpentine segment is connected to another terminal.

[0008] Preferably, the deformation length of the deformation section is greater than the bending length of the bending section.

[0009] Compared with the prior art, the advantages and positive effects of the utility model are:

[0010] 1. The utility model provides an adaptive heating film, in which the deformed section on the insulating film and the bent section on the resistance wire constitute the adaptive structure of the heating film, so that the actual length of the heating film can be freely expanded and contracted according to the expansion degree of the battery cell, ensuring that the heating film always fits the surface of the battery cell without the risk of tearing, thereby obtaining a longer actual service life and a higher utilization rate. In addition, the utility model has a reasonable design, a simple structure, and strong practicality, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 An exploded diagram of an adaptive heating film provided in an embodiment;

[0013] Figure 2 A top view of an adaptive heating film provided in an embodiment;

[0014] In the above figures, 1, insulating film; 11, deformation segment; 12, plane segment; 2, resistance wire; 21, bending segment; 22, straight segment; 23, plane serpentine segment; 3, wiring harness; 4, terminal. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0017] Examples, such as Figure 1 and Figure 2As shown, the utility model provides an adaptive heating film, including an insulating film 1 and a resistance wire 2, both ends of the resistance wire 2 are provided with a wiring harness 3 and a terminal 4 connected to the wiring harness 3, wherein the two terminals 4 can be connected to the positive and negative ends of the heating power supply respectively. The insulating film 1 provides an insulating environment for the resistance wire 2, but does not affect the heat conduction of the resistance wire 2 to the battery core. On this basis, the insulating film 1 provided by the utility model has two layers and is relatively distributed front and back, and a back adhesive layer for bonding the battery core is provided on one side of the insulating film 1, so as to facilitate the bonding and fixing of the heating film to the side of the battery core, and the resistance wire 2 is used to be arranged between the two layers of the insulating film 1, and a plurality of uniformly spaced deformation segments 11 are provided on the insulating film 1, and a plane segment 12 is provided between adjacent deformation segments 11, and the deformation segments 11 on the two layers of the insulating film 1 are relatively distributed front and back, and the resistance wire 2 is provided with a bending segment 21 at the position corresponding to the deformation segment 11, and the bending segment 21 and the deformation segment 11 are not in contact with the battery core.

[0018] Specifically, the flat section 12 of the insulating film 1 can contact the surface of the battery cell, and is used to transfer the current heat of the resistance wire 2 to the battery cell, so that the battery cell can be heated up in a relatively low temperature environment; the deformed section 11 on the insulating film 1 and the curved section 21 on the resistance wire 2 constitute the adaptive structure of the heating film, and the adaptive structure does not contact the side of the battery cell. When the battery cell expands during the cycle, the actual length of the adaptive structure can be freely expanded and contracted according to the expansion degree of the battery cell, ensuring that the heating film adhesive backing does not generate stress on the side of the battery cell, so that the heating film is always tightly fitted with the side of the battery cell, and at the same time eliminates the risk of the heating film being torn by force, thereby obtaining a longer actual service life and a higher utilization rate, and the design is reasonable, the structure is simple, and the practicality is strong.

[0019] In order to improve the adaptability of the deformation section 11, the cross-section of the deformation section 11 provided by the utility model is an arc-shaped arch. The arc-shaped arch design can achieve a smooth transition with the plane section 12. Even if bending deformation occurs, the plane section 12 can contact the surface of the battery cell relatively naturally, and will not produce bulging on the surface of the insulating film 1 to increase unnecessary wear.

[0020] On the basis of designing the curved section 21 for the resistance wire 2, in order to ensure the heating performance of the resistance wire 2, the resistance wire 2 provided by the utility model includes a straight section 22, and the straight section 22 is provided with a plurality of planar serpentine sections 23 connected end to end in sequence at the end away from the terminal 4 connected thereto, and the area where each planar serpentine section 23 is located is opposite to the front and back of the planar section 12, and curved sections 21 are provided on the straight section 22 and between adjacent planar serpentine sections 23, and the last end of the planar serpentine section 23 is connected to another terminal 4. In this way, the resistance wire 2 has a sufficient laying area in a limited space, which is conducive to improving its heating efficiency for the battery cell, and the distribution position of the curved section 21 is conducive to the adaptive change of the resistance wire 2 and the insulating film 1 in coordination, thereby ensuring the real-time fitting performance of the heating film and the battery cell.

[0021] Furthermore, due to the design feature that the insulating film 1 is located outside the resistance wire 2, the deformation length of the deformation section 11 provided by the utility model is greater than the bending length of the bending section 21, which is conducive to ensuring that the deformation section 11 and the bending section 21 always maintain good integrity under real-time conditions. The arc radius of the deformation section 11 can be freely adjusted according to the expansion displacement of the battery cell, the spacing of the arc arch structure can be adjusted according to the thickness of the battery cell, the number of arc arch structures is determined according to the number of battery cells in a group, and accordingly, the number of bending sections 21 is also determined according to the number of battery cells in a group.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An adaptive heating film, comprising an insulating film and a resistance wire, wherein both ends of the resistance wire are provided with a wiring harness and a terminal connected to the wiring harness, characterized in that: The insulating film has two layers and is relatively distributed front to back. A back adhesive layer for bonding the battery cell is provided on one side of the insulating film. A resistance wire is provided between the two layers of the insulating film. A plurality of deformation segments evenly spaced apart are provided on the insulating film, and a plane segment is provided between adjacent deformation segments. The deformation segments on the two layers of the insulating film are relatively distributed front to back. The resistance wire is provided with a bent segment at a position corresponding to the deformation segment, and neither the bent segment nor the deformation segment is in contact with the battery cell.

2. The adaptive heating film according to claim 1, characterized in that: The cross section of the deformation section is in the shape of a circular arc.

3. The adaptive heating film according to claim 2, characterized in that: The resistance wire includes a straight segment, and a plurality of planar serpentine segments connected end to end are arranged at one end of the straight segment away from the terminal connected to it, and the area where each planar serpentine segment is located is opposite to the front and back of the planar segment. Bent segments are arranged on the straight segment and between adjacent planar serpentine segments, and the last end of the planar serpentine segment is connected to another terminal.

4. The adaptive heating film according to claim 3, characterized in that: The deformation length of the deformation section is greater than the bending length of the bending section.

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