Composite heating film and power battery
By using a composite heating film in the power battery, setting up heating and heat-free areas, and combining an insulation layer and a thermally conductive layer, the short-circuit risk caused by voltage differences between power battery modules is solved, achieving higher electrical safety and high-voltage resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI GUOXUAN HIGH TECH POWER ENERGY
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-26
Smart Images
Figure CN224290099U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lithium battery technology, and specifically relates to a composite heating film and a power battery. Background Technology
[0002] With the widespread application of new energy power batteries, their performance also needs to be continuously developed in order to ensure sufficient power supply to meet usage demands.
[0003] Existing power batteries generally increase battery capacity by improving energy density. However, when the energy density of a power battery is too high, the voltage difference between its modules is extremely large. In particular, the voltage difference between the total positive and total negative voltages of the system can reach hundreds or even thousands of volts. This can lead to dangerous situations such as system short circuits due to the destruction of system insulation during use, making it difficult to guarantee the safety of power battery use. Utility Model Content
[0004] To address the above problems, this utility model proposes a composite heating film, comprising:
[0005] The core material has a heating zone on it;
[0006] A heat-free zone is also provided on one side of the core material;
[0007] A heat-conducting layer is provided covering the heating area.
[0008] In some specific embodiments, a groove is formed on at least one side of the core material, and a heating wire is embedded in the groove to form the heating area;
[0009] One side of the core material extends away from the heating area to form the heat-free area.
[0010] In some specific embodiments, the grooves are formed on both sides of the core material to form heating areas on both sides of the core material respectively;
[0011] Two heat-conducting layers are provided, and the two heat-conducting layers are provided one-to-one with the two heating areas.
[0012] In some specific embodiments, the heating area is covered with an insulating layer;
[0013] The insulating layer is located between the core material and the thermally conductive layer.
[0014] In some specific embodiments, the heating wire is provided with two electrodes;
[0015] The two electrodes are respectively arranged to extend from both ends of the core material away from the heating area;
[0016] The two electrodes are each connected to a power supply terminal.
[0017] In some specific embodiments, the thermally conductive layer extends to cover both of the electrode arrangements;
[0018] The power terminals are pressed into the heat-conducting layer and connected to the corresponding electrodes.
[0019] In some specific embodiments, the core material has a thickness of 0.2 mm to 2 mm.
[0020] In some specific embodiments, the thickness of the thermally conductive layer is from 0.2 mm to 2 mm.
[0021] In some specific embodiments, the thermally conductive layer is vulcanized silicone;
[0022] The insulating layer is a silicone grease film.
[0023] A power battery based on the same concept includes: a composite heating film as described in any of the above specific embodiments.
[0024] Compared with existing technologies, the composite heating film of this invention has at least the following advantages: By setting the core material and the heat-conducting layer, a double- or triple-layer structure can be formed. This, combined with the heating area of the core material, improves heating uniformity, ensuring uniform heating between adjacent modules in the power battery. Simultaneously, the structure of the heat-free area in the core material increases the creepage distance between adjacent modules, thereby preventing dangerous situations such as system short circuits due to insulation failure during use and thermal runaway tests, reducing the probability of system safety accidents and ensuring the electrical safety of the power battery. Furthermore, the use of epoxy material instead of traditional PI core material in the core material of this composite heating film further enhances its high-voltage and high-temperature resistance.
[0025] The power battery of this utility model includes the composite heating film described above, so it has the same beneficial effects as the composite heating film described above, therefore, it will not be described again here.
[0026] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A schematic diagram of the composite heating film in an embodiment of the present invention is shown;
[0029] Figure 2 A schematic diagram of the power battery in an embodiment of this utility model is shown.
[0030] In the diagram, 100 is the core material; 110 is the heating area; 120 is the heat-free area; 200 is the thermally conductive layer; 300 is the power terminal; and 400 is the module. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0032] Reference Figure 1 This utility model embodiment provides a composite heating film, including: a core material 100 and a thermally conductive layer 200. A heating area 110 is provided on the core material 100. A heat-free area 120 is also provided on one side of the core material 100. The thermally conductive layer 200 is disposed covering the heating area 110.
[0033] Specifically, the core material 100 has two regions: a heating region 110 and a heat-free region 120. The heat-free region 120 is located on one side of the core material 100, meaning the heating region 110 and the heat-free region 120 are adjacent to each other. The heating region 110 can release heat to provide warmth, while the heat-free region 120 itself has no heating function. The thermally conductive layer 200 is located on one side of the core material 100 and covers the heating region 110 of the core material 100. By setting the core material 100 and the heat-conducting layer 200, the whole structure can be formed into a double or triple layer. In conjunction with the heating area 110 of the core material 100, the heating uniformity of the composite heating film can be greatly improved to ensure the uniform heating of the power battery system. At the same time, by setting the heat-free area 120 of the core material 100, the creepage distance between adjacent modules 400 in the power battery can be increased. This can avoid dangerous situations such as system short circuits caused by system insulation failure during use and thermal runaway tests, reduce the probability of system safety accidents, and ensure the electrical safety of the power battery.
[0034] In some specific embodiments of this utility model, a groove is formed on at least one side of the core material 100, and an electric heating wire is embedded in the groove to form a heating area 110. One side of the core material 100 extends away from the heating area 110 to form a heat-free area 120.
[0035] Specifically, the core material 100 has a plate-like structure, with grooves evenly distributed on one side of the core material 100, thus creating a regional arrangement of grooves on the core material 100. Heating wires are embedded within the grooves along their direction. Through the grooves on the core material 100 and the heating wires within them, a heating area 110 is formed on one side of the core material 100 within the radiation range of the grooves. Heating of the heating area 110 is achieved by heating with the heating wires. One side of the core material 100 extends outward away from the grooves, and this extended portion of the core material 100 does not have grooves, thus this extended portion of the core material 100 does not have a heating function, forming a heat-free area 120. This structure is flexible and simple, easy to install, and can improve the heating uniformity and electrical safety of the power battery.
[0036] In some specific embodiments of this utility model, grooves are provided on both sides of the core material 100 to form heating areas 110 on both sides of the core material 100 respectively. Two heat-conducting layers 200 are provided, and the two heat-conducting layers 200 are provided in a one-to-one correspondence with the two heating areas 110.
[0037] Specifically, because the core material 100 has a plate-like structure, grooves are evenly arranged on both sides of the core material 100, so that the grooves on both sides are arranged in a regional configuration on the core material 100, and the grooves on both sides are corresponding to each other. This allows heating areas 110 of the core material 100 to be formed within the radiation range of the corresponding grooves on both sides. Heating wires are embedded in the grooves on both sides, thereby achieving the heating function of the two heating areas 110 through heating by the heating wires. Two thermally conductive layers 200 are arranged corresponding to the two sides of the core material 100, and the two thermally conductive layers 200 respectively cover the heating areas 110 on the two sides of the core material 100, thus realizing a three-layer structure between the core material 100 and the thermally conductive layers 200. This improves the heating uniformity of the power battery and further enhances the heating performance of the composite heating film.
[0038] In some specific embodiments of this utility model, the heating area 110 is covered with an insulating layer. The insulating layer is located between the core material 100 and the heat-conducting layer 200.
[0039] Specifically, after the heating area 110 is formed by the groove and the heating wire, an insulating layer is applied to the heating area 110, with one side of the insulating layer abutting against the side of the core material 100. This insulating layer covers the opening of the groove, thus confining the heating wire within the groove. Furthermore, a heat-conducting layer 200 covers the side of the insulating layer facing away from the heating area 110 of the core material 100. The insulating layer is positioned between the heating area 110 of the core material 100 and the heat-conducting layer 200, preventing the heating wire from contacting the heat-conducting layer 200 and improving electrical safety.
[0040] In some specific embodiments of this utility model, the heating wire is provided with two electrodes. The two electrodes extend from both ends of the core material 100 away from the heating area 110. The two electrodes are respectively connected to power terminals 300.
[0041] Specifically, the heating wire is connected to two electrodes, which are respectively located at both ends of the core material 100 and extend outward from the core material 100 in a direction away from the heating area 110. One electrode can serve as the positive electrode of the heating wire, and the other electrode can serve as the negative electrode of the heating wire, so as to supply power to the heating wire. Both electrodes are connected to power terminals 300 to connect to a power source and realize the heating of the heating wire.
[0042] Furthermore, the two ends of the groove extend toward the two electrodes respectively, so that the two ends of the heating wire arranged along the groove can be connected to the two electrodes respectively.
[0043] In some specific embodiments of this utility model, the thermally conductive layer 200 extends to cover the two electrodes. Power terminals 300 are respectively pressed into the thermally conductive layer 200 and connected to the corresponding electrodes.
[0044] Specifically, both ends of the heat-conducting layer 200 extend towards the two electrodes according to their respective positions, ensuring that the outwardly extending portions of the heat-conducting layer 200 completely cover the electrode surfaces. This protects and secures the electrodes, preventing damage. Simultaneously, the ends of the two power terminals 300 are pressed into the heat-conducting layer 200 and connected to their corresponding electrodes. The heat-conducting layer 200 prevents the ends of the power terminals 300 from impacts from external objects, while also improving the stability of the connection between the power terminals 300 and the electrodes.
[0045] In some specific embodiments of this utility model, the thickness of the core material 100 is between 0.2 mm and 2 mm. Specifically, when the thickness of the core material 100 is less than 0.2 mm, it is difficult to process grooves and install heating wires on the core material 100, which will affect the heating performance of the core material 100. When the thickness of the core material 100 is greater than 2 mm, it will easily occupy the space in the power battery used to install the module 400, thus affecting the capacity of the power battery. However, when the thickness of the core material 100 is within the range of 0.2 mm to 2 mm, the overall performance of the composite heating film can be guaranteed while ensuring the capacity of the power battery.
[0046] In some specific embodiments of this utility model, the thickness of the thermally conductive layer 200 is between 0.2 mm and 2 mm. Specifically, when the thickness of the thermally conductive layer 200 is less than 0.2 mm, it is difficult for the thermally conductive layer 200 to protect the heating area 110 of the core material 100. When the thickness of the thermally conductive layer 200 is greater than 2 mm, it easily affects the thermal conductivity of the thermally conductive layer 200 and easily occupies the space in the power battery used to house the module 400, thereby affecting the capacity of the power battery. When the thickness of the thermally conductive layer 200 is within the range of 0.2 mm to 2 mm, it can reduce the probability of damage to the composite heating film while ensuring the overall performance of the composite heating film and ensuring the capacity of the power battery.
[0047] In some specific embodiments of this utility model, the thermally conductive layer 200 is vulcanized silicone. The insulating layer is a silicone grease film. This facilitates manufacturing and use, and the cost is relatively low.
[0048] Furthermore, the core material 100 is composed of epoxy resin, ceramic, glass fiber, and adhesive. The ratio of epoxy resin, ceramic, glass fiber, and adhesive is 6:2:1:1. Using epoxy resin core material 100 instead of the traditional PI core material further enhances the high pressure and high temperature resistance of the composite heating film, ensuring safety.
[0049] Further, the preparation process of the composite heating film includes: 1. Adding ceramic, glass fiber, and adhesive sequentially to epoxy material in a molten state, and mixing in a stirrer. After uniform mixing, pouring into a molding die and cooling to obtain core material 100. 2. Uniformly opening grooves on the outer surface of at least one side of the formed core material 100, with the grooves located at least away from at least one side of the core material 100, and embedding heating wires in the grooves, with the electrodes of the heating wires located at both ends of the core material 100. 3. Covering the opening of the grooves with a thermoplastic adhesive to form an insulating layer, and rolling it at least once under a pressure of 0.1MPa-0.3MPa. 4. Curing the outer surface of the rolled insulating layer to form a heat-conducting layer 200.
[0050] Reference Figure 2 This utility model embodiment also provides a power battery, including a composite heating film as described in any of the above specific embodiments. By configuring the core material 100 and the thermally conductive layer 200 of the composite heating film, a double-layer or triple-layer structure can be formed. This, combined with the heating area 110 of the core material 100, improves the heating uniformity of the heating area 110, ensuring uniform heating between adjacent modules 400 in the power battery. Simultaneously, the structure of the heat-free area 120 of the core material 100 increases the creepage distance between adjacent modules 400, thereby preventing dangerous situations such as system short circuits due to insulation failure during use and thermal runaway testing, reducing the probability of system safety accidents and ensuring the electrical safety of the power battery. Furthermore, the use of epoxy material instead of traditional PI core material in the core material of this composite heating film further enhances its high-voltage and high-temperature resistance.
[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A composite heating film, characterized by, include: A core material (100) having a heating zone (110) thereon; A heat-free area (120) is also provided on one side of the core material (100); A heat-conducting layer (200) is provided covering the heating area (110).
2. The composite heating film of claim 1, wherein, At least one side of the core material (100) is provided with a groove, and an electric heating wire is embedded in the groove to form the heating area (110); One side of the core material (100) extends away from the heating area (110) to form the heat-free area (120).
3. The composite heating film of claim 2, wherein, The grooves are provided on both sides of the core material (100) to form the heating area (110) on both sides of the core material (100); There are two heat-conducting layers (200), and the two heat-conducting layers (200) are provided in a one-to-one correspondence with the two heating areas (110).
4. The composite heating film of claim 2, wherein, The heating area (110) is covered with an insulating layer; The insulating layer is located between the core material (100) and the thermally conductive layer (200).
5. The composite heating film of claim 2, wherein, The heating wire is provided with two electrodes; The two electrodes are respectively arranged to extend from both ends of the core material (100) in a direction away from the heating area (110); The two electrodes are each connected to a power supply terminal (300).
6. The composite heating film of claim 5, wherein, The thermally conductive layer (200) extends to cover the two electrode arrangements; The power terminals (300) are pressed into the heat-conducting layer (200) and connected to the corresponding electrodes.
7. The composite heating film of claim 1, wherein, The core material (100) has a thickness of 0.2 mm to 2 mm.
8. The composite heating film of claim 1, wherein, The thickness of the thermally conductive layer (200) is 0.2 mm to 2 mm.
9. The composite heating film of claim 4, wherein, The thermally conductive layer (200) is vulcanized silicone; The insulating layer is a silicone grease film.
10. A power cell, characterized by include: The composite heating film as described in any one of claims 1 to 9.