Magnetic type heating film and battery pack

Abstract

The utility model provides a magnetic suction type heating film and battery pack, the magnetic suction type heating film comprises a film body, the film body comprises a heating layer with a heating part and a magnetic suction layer arranged on at least one side of the heating layer, and the film body is magnetically adsorbed with a battery pack component or a magnetic suction matching layer of the battery pack component through the magnetic suction layer. And the battery pack is connected to the battery pack component. According to the magnetic type heating film provided by the utility model, the magnetic layer is arranged on at least one side of the heating layer, and the film body is directly adsorbed with the battery pack component through the magnetic layer, or the film body is indirectly connected to the battery pack component through the magnetic adsorption of the magnetic layer and the magnetic matching layer on the battery pack component; the installation convenience of the magnetic type heating film is improved, the magnetic layer and the battery pack component are reliably connected together, gas between the film body and the battery pack component can be discharged, the problem of dry burning of the magnetic type heating film can be avoided, and the use performance and safety of the battery pack can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a magnetic heating film; at the same time, this utility model also relates to a battery pack equipped with the magnetic heating film. Background Art

[0002] As new energy vehicles gradually become more commercialized, the number of vehicle power battery systems is increasing. In order to meet the needs of users under different environmental conditions, heating films are installed in some battery packs to heat battery pack components (such as cells or battery modules) to ensure that the battery pack can still provide sufficient power and maintain good charging and discharging performance in low-temperature environments, thereby improving the user experience.

[0003] In existing technologies, heating films are typically attached to battery modules or cells within the battery pack using double-sided adhesive. The degree of adhesion is ensured solely by worker operation or equipment fixtures, or by using foam for compression or support. However, regardless of the method used, it is impossible to completely confirm whether the heating film is properly attached. While foam support or compression can ensure good adhesion in certain areas, the adhesion in areas without foam cannot be guaranteed.

[0004] Furthermore, uncertainties exist in worker operation and equipment tooling during heating film installation. Factors such as improper worker pressure and equipment wear can lead to inadequate adhesion, resulting in poor bonding, air bubbles, and uneven adhesion. If the heating film does not adhere properly to the battery module or cell, it can cause dry burning during operation. When dry burning occurs, the adhesion will gradually separate, creating more areas of dry burning. Spontaneous combustion of the heating film due to dry burning can then lead to a fire in the battery pack, compromising its safety. Utility Model Content

[0005] In view of this, the present invention aims to provide a magnetic heating film, which facilitates its arrangement on battery pack components and improves the safety of the battery pack.

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

[0007] A magnetic heating film includes a film body, the film body including a heating layer having a heating portion, and a magnetic layer disposed on at least one side of the heating layer. The film body is connected to the battery pack component by magnetic adsorption between the magnetic layer and a battery pack component or a magnetic mating layer of the battery pack component.

[0008] Furthermore, the heating layer includes a first insulating film, the heating part includes an electric heating element disposed on one side of the first insulating film, and the magnetic attraction layer is disposed at least on the outside of the electric heating element; or,

[0009] The heating layer includes a first insulating film, the heating part includes electric heating elements disposed on both sides of the first insulating film, and the magnetic attraction layer is disposed on the outer side of each of the electric heating elements.

[0010] Furthermore, the electric heating element is made of copper foil or a copper-nickel alloy.

[0011] Furthermore, the electric heating element has multiple curved segments connected in sequence.

[0012] Furthermore, the electric heating element is formed by etching or printing processes; and / or,

[0013] The first insulating film is made of polyimide.

[0014] Furthermore, the heating layer is formed by hot pressing the electric heating element and the first insulating film together.

[0015] Furthermore, the magnetic layer is a second insulating film with a magnetic material, or...

[0016] The magnetic layer includes a second insulating film and a magnetic coating layer having the second insulating film on the side facing away from the heating layer.

[0017] Furthermore, the second insulating film and the heating layer are joined together by a thermal bonding process.

[0018] Furthermore, the second insulating film is made of polyimide.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] The magnetic heating film of this invention features a magnetic layer on at least one side of the heating layer. The film body is directly attached to the battery pack component via the magnetic layer, or indirectly connected to the battery pack component via the magnetic adsorption of the magnetic layer and the magnetic mating layer on the battery pack component. This design improves the ease of installation of the magnetic heating film, eliminates the need for adhesive, and reduces production costs. The reliable connection between the magnetic layer and the battery pack component also facilitates the release of gas between the film body and the battery pack component, eliminating the problem of dry burning caused by gaps between them. This, in turn, improves the performance and safety of the battery pack.

[0021] Furthermore, placing the magnetic layer on the outside of the electric heating elements in the first insulating layer and the electric heating elements improves the flexibility of the magnetic heating film. Placing electric heating elements on both sides of the first insulating film, and having a magnetic layer on the outside of each electric heating element, further enhances the heating performance of the magnetic heating film. The electric heating elements are made of copper foil or a copper-nickel alloy, both of which have good heat transfer properties, ensuring the heating effect of the magnetic heating film. Copper foil or copper-nickel alloy is also easy to arrange. The electric heating elements have multiple sequentially connected curved segments, increasing the heating length of the electric heating elements and further improving their heating performance.

[0022] Furthermore, the electric heating element is formed through etching or printing processes, offering the advantage of easy processing. The first insulating film, made of polyimide, exhibits good high-temperature resistance, resulting in good durability and reliability. In practice, the electric heating element and the first insulating film are bonded together using a hot-pressing process to form the heating layer, which improves the forming efficiency and stability of the heating layer. The second insulating film, incorporating magnetic material, provides good insulation and magnetic attraction. The magnetic coating on the second insulating film further ensures the magnetic attraction and insulation properties of the magnetic layer. The second insulating film and the heating layer are joined together using a thermal bonding process, ensuring the insulation performance of the second insulating film and enhancing the reliability of the connection between them. The second insulating film, made of polyimide, ensures both insulation and high-temperature resistance.

[0023] In addition, another objective of this utility model is to provide a battery pack, wherein the battery pack is provided with a magnetic heating film as described above.

[0024] The battery pack described in this invention improves its performance and safety by incorporating the aforementioned magnetic heating film. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0026] Figure 1 This is a disassembled diagram of the magnetic heating film described in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Membrane body; 2. Heating layer; 3. Magnetic layer;

[0029] 201, First insulating layer; 202, Electric heating element; 2021, Bending section; 2022, Connecting part. DETAILED DESCRIPTION

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] This embodiment relates to a magnetic heating film to solve the problems of low installation efficiency and high production cost of magnetic heating films bonded to battery pack components in the prior art.

[0034] In terms of overall structure, the magnetic heating film in this embodiment includes a film body 1, which includes a heating layer 2 with a heating part and a magnetic layer 3 disposed on at least one side of the heating layer 2. The film body 1 is connected to the battery pack component by magnetic adsorption between the magnetic layer 3 and the battery pack component or the magnetic adsorption mating layer of the battery pack component.

[0035] The magnetic heating film described in this embodiment improves the ease of installation by providing a magnetic layer 3 on at least one side of the heating layer 2. The film body 1 is directly adsorbed onto the battery pack component via the magnetic layer 3, or indirectly connected to the battery pack component via the magnetic adsorption of the magnetic layer 3 and a magnetic mating layer on the battery pack component. Furthermore, the magnetic heating film eliminates the need for adhesive during installation, reducing production costs. The reliable connection between the magnetic layer 3 and the battery pack component also facilitates the release of gas between the film body 1 and the battery pack component, eliminating the problem of dry burning caused by gaps between them, thereby improving the performance and safety of the battery pack.

[0036] Based on the above overview, an exemplary structure of the magnetic heating film described in this embodiment is as follows: Figure 1 As shown in the figure. In this embodiment, the battery pack components can specifically be battery modules, cells, etc., which can heat the battery modules or cells, thereby enabling the battery pack to operate within a suitable temperature range and thus improving the performance of the battery pack.

[0037] When the magnetic layer 3 approaches the corresponding part on the battery pack component, they will attract each other, thereby achieving a magnetic attraction effect. In some embodiments, the membrane body 1 in this embodiment is directly connected to the battery pack component through the magnetic layer 3. At this time, the part of the battery pack component that cooperates with the magnetic layer 3 can be made of a material that can be magnetically attracted to the magnetic layer 3. For example, the part that cooperates with the magnetic layer 3 can be made of steel.

[0038] In other embodiments, the membrane body 1 is magnetically attracted to the magnetic mating layer on the battery pack component via the magnetic attraction layer 3. In this case, the magnetic mating layer can be provided on the portion of the battery pack component that mates with the magnetic attraction layer 3. This allows the magnetic attraction layer 3 to be directly connected to the battery pack component, or indirectly connected via the magnetic mating layer, providing good flexibility in use. In this embodiment, the magnetic attraction layer 3 functions as a magnet, while the magnetic mating layer is made of a material that can be magnetically attracted by a magnet.

[0039] As a preferred implementation method, such as Figure 1 As shown, the heating layer 2 includes a first insulating film, and the heating part includes an electric heating element 202 disposed on one side of the first insulating film. A magnetic attraction layer 3 is disposed at least on the outer side of the electric heating element 202. In one embodiment, the magnetic attraction layers 3 are disposed on the outer sides of both the first insulating layer 201 and the electric heating element 202. In this case, the first insulating film and the electric heating element 202 are disposed between the two magnetic attraction layers 3, allowing both sides of the membrane body 1 to be magnetically attracted to the battery pack component, thus providing good connection flexibility.

[0040] In other embodiments, the magnetic layer 3 may be provided only on the outer side of the electric heating element 202, that is, only one magnetic layer 3 may be provided on one membrane body 1. In this case, the electric heating element 202 is located between the magnetic layer 3 and the first insulating layer 201. The magnetic layer 3 and the first insulating layer 201 work together to achieve an insulating effect. In specific implementations, the number and position of the magnetic layer 3 can be determined according to the implementation requirements, thus providing good flexibility in use.

[0041] In other embodiments, the heating layer 2 includes a first insulating film, and the heating part includes electric heating elements 202 disposed on both sides of the first insulating film, with magnetic layers 3 disposed on the outer side of each electric heating element 202. In this case, the two electric heating elements 202 cooperate to further improve the heating performance of the magnetic heating film.

[0042] In this embodiment, the electric heating element 202 is made of copper foil or a copper-nickel alloy, both of which have good heat transfer performance, thus ensuring the heating effect of the absorption heating film. Furthermore, copper foil or copper-nickel alloy is easy to arrange and implement. In addition, the electric heating element 202 is formed by etching or printing processes, which has the advantage of being easy to process and shape.

[0043] To further ensure the performance of the electric heating element 202, such as Figure 1 As shown, the electric heating element 202 has multiple curved segments 2021 connected in sequence. This arrangement of multiple curved segments 2021 increases the heating length of the electric heating element 202, thereby further improving its heating performance. Additionally, to enable electrical connection between the electric heating element 202 and an external power source, two connecting portions 2022 extending out of the membrane body 1 are provided on the electric heating element 202. The connecting portions 2022 can be connected to the electric heating element 202 by welding or riveting.

[0044] In this embodiment, the first insulating film serves as the carrier substrate for the electric heating element 202, and this first insulating film is made of polyimide. This gives the first insulating film good high-temperature resistance, resulting in good durability and reliability. Of course, it is also feasible to use other high-temperature resistant insulating materials for the first insulating film. In specific connection, the electric heating element 202 and the first insulating film are formed into the heating layer 2 through a hot-pressing process, which helps to improve the forming efficiency and stability of the heating layer 2.

[0045] In some embodiments, the magnetic layer 3 in this embodiment is a second insulating film with a magnetic material. The second insulating film with the magnetic material has good insulation and magnetic attraction effects. In specific implementation, the magnetic material can be set in the material of the second insulating film during the forming process, thereby being set in the second insulating film. The magnetic material here can be microparticles of magnetic materials such as ferrite and neodymium iron boron with magnetic adsorption function.

[0046] In other embodiments, the magnetic layer 3 includes a second insulating film and a magnetic coating layer on the side of the second insulating film facing away from the heating layer 2. The magnetic coating layer on the second insulating film also helps ensure the magnetic attraction and insulation properties of the magnetic layer 3. The magnetic coating layer is composed of magnetic materials. Common components include microparticles of magnetic materials such as ferrite and neodymium iron boron. The main performance characteristic of the magnetic coating layer is its ability to generate sufficient magnetic attraction force to achieve a tight connection between the membrane body 1 and the battery pack components. The magnitude of its attraction force can be adjusted according to actual needs, for example, by changing the content of the magnetic material or the thickness of the coating to enhance or weaken the attraction force.

[0047] When the magnetic absorbing layer 3 and the magnetic attraction layer can be magnetically attracted and connected, the principle is mainly based on the interaction of the magnetic poles of the magnetic materials. For the materials of the magnetic absorbing layer 3 and the magnetic attraction layer, magnetic materials such as iron, cobalt, nickel, and their alloys are typically chosen. For example, neodymium iron boron alloy can be used as a high-performance magnetic absorbing material for the magnetic absorbing layer 3 and the magnetic attraction layer. Because neodymium iron boron alloy has strong magnetism, it can provide sufficient attraction force in a small volume, ensuring the stability of the attraction. In addition, ferrite materials are also a commonly used choice; they are relatively inexpensive and possess a certain degree of magnetism.

[0048] In practice, the second insulating film and the heating layer 2 are joined together through a thermal bonding process. This helps ensure the insulation performance of the second insulating film and also improves the reliability of the connection between the second insulating film and the heating layer 2. For example, the second insulating film is made of polyimide to ensure insulation and high-temperature resistance. Of course, the second insulating layer can also be made of other insulating materials with high-temperature resistance.

[0049] The magnetic heating film described in this embodiment uses a magnetic layer 3 on the film body 1 to fix the film body 1 to the battery pack component via magnetic attraction, eliminating the need for rolling and manual pressing during the double-sided adhesive bonding process. Simultaneously, the magnetic layer 3 ensures effective adhesion between the film body 1 and the battery pack component, preventing poor adhesion due to improper manual operation or insufficient handling, and addressing the problem of micro-air bubbles easily forming between the film body 1 and the battery pack component during the bonding process.

[0050] The magnetic heating film of this embodiment makes the installation process of the entire film body 1 simple and easy to operate, which helps to improve the production qualification rate of the battery pack. Moreover, the film body 1 is easy to replace, which facilitates easy reuse. At the same time, it helps to avoid the problem of residual adhesive in the existing adhesive bonding, and also helps to eliminate the risk of battery pack spontaneous combustion and fire caused by poor adhesion of the film body 1.

[0051] In addition, this embodiment also relates to a battery pack, which has a magnetic heating film as described above.

[0052] The battery pack described in this embodiment improves its performance and safety by incorporating the magnetic heating film described above.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic heating film, characterized in that: The membrane body includes a heating layer having a heating portion and a magnetic layer disposed on at least one side of the heating layer. The membrane body is connected to the battery pack component by magnetic attraction between the magnetic layer and the battery pack component or a magnetic coupling layer of the battery pack component.

2. The magnetic heating film according to claim 1, characterized in that: The heating layer includes a first insulating film, the heating part includes an electric heating element disposed on one side of the first insulating film, and the magnetic attraction layer is disposed at least on the outside of the electric heating element; or, The heating layer includes a first insulating film, the heating part includes electric heating elements disposed on both sides of the first insulating film, and the magnetic attraction layer is disposed on the outer side of each of the electric heating elements.

3. The magnetic heating film according to claim 2, characterized in that: The electric heating element is made of copper foil or a copper-nickel alloy.

4. The magnetic heating film according to claim 2, characterized in that: The electric heating element has multiple curved segments connected in sequence.

5. The magnetic heating film according to claim 2, characterized in that: The electric heating element is formed by etching or printing processes; and / or, The first insulating film is made of polyimide.

6. The magnetic heating film according to claim 2, characterized in that: The heating layer is formed by hot pressing the electric heating element and the first insulating film together.

7. The magnetic heating film according to any one of claims 1 to 6, characterized in that: The magnetic layer is a second insulating film with a magnetic material, or... The magnetic layer includes a second insulating film and a magnetic coating layer having the second insulating film on the side facing away from the heating layer.

8. The magnetic heating film according to claim 7, characterized in that: The second insulating film and the heating layer are joined together by a thermal bonding process.

9. The magnetic heating film according to claim 7, characterized in that: The second insulating film is made of polyimide.

10. A battery pack, characterized in that: The battery pack is provided with a magnetic heating film as described in any one of claims 1 to 9.

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