A PI heating film system assembly suitable for soft package battery cell module

Abstract

The utility model discloses a kind of PI heating film system assembly suitable for soft package battery module, including heating film body and soft package battery, the heating film body includes heating element and double-layer PI film covered in heating element outside, two single-layer films of the double-layer PI film are connected, and the soft package battery is fixed on every layer PI film two sides;Every layer PI film is provided with hollow area, and the hollow area avoids heating element setting.The soft package battery of the utility model is fixed on every layer PI film two sides by double-sided adhesive, and two single-layer films are connected, heating efficiency is higher, every layer PI film is provided with hollow area, reduce PI film material use, reduce overall weight, help to improve local heat dissipation efficiency, prevent local overheating, while it can offset the deformation effect caused by module volume change, to improve the reliability of heating film, prolong the service life of battery pack.

Description

Technical Field

[0001] This utility model relates to a PI heating film system assembly suitable for soft-pack battery cell modules. Background Technology

[0002] Existing pouch cells have aluminum-plastic film seals on the sides and bottom, which have gaps and small areas, making them unsuitable for direct use as adhesive surfaces for heating films. Therefore, PTC or silicone heating elements are typically glued to the sides or bottom of the pouch module, with the space between the cell and the heating element filled with thermally conductive potting compound or using an aluminum plate as a heat transfer medium; however, this method is inefficient. Pouch cells undergo significant volume expansion and contraction during charge-discharge cycles, with the expansion being most pronounced in the central region. Traditional integral PI heating film structures are rigid and cannot withstand the deformation caused by repeated cell expansion, easily leading to fatigue fracture of the heating element or detachment from the cell surface, affecting heating reliability and lifespan. Furthermore, large-area continuous heating film coverage can easily cause localized heat accumulation, especially in the area with the highest temperature at the center of the cell, potentially triggering thermal runaway. Utility Model Content

[0003] The purpose of this invention is to provide a PI heating film system assembly suitable for soft-pack battery cell modules, so as to solve the technical problems mentioned in the background art.

[0004] The technical solution to achieve the purpose of this utility model is: a PI heating film system assembly suitable for soft-pack battery cell modules, including a heating film body and a soft-pack battery cell. The heating film body includes a heating element and a double-layer PI film covering the heating element. The two single-layer films of the double-layer PI film are connected. The soft-pack battery cell is fixed on both sides of each layer of PI film. Each layer of PI film is provided with a hollow area, which is set away from the heating element.

[0005] Furthermore, the hollow area includes a first hollow area, a second hollow area, and a third hollow area. The first hollow area is located in the middle of the PI film and divides each layer of PI film into two layout areas, left and right. The heating elements in each layout area are distributed in a serpentine pattern from top to bottom, and the heating elements in the two layout areas are connected at the bottom. The second hollow area is located between two parallel heating elements, and the third hollow area is located at the edge of the layout area.

[0006] Furthermore, the third hollow area is positioned corresponding to the second hollow area, and the connection between the third hollow area and the second hollow area is broken when force is applied.

[0007] Furthermore, the double-layer PI film includes a connecting part, the connecting part includes two terminals, each layer of PI film is provided with a terminal, the heating element is arranged in series, and each end is connected to a terminal.

[0008] Furthermore, the surface of the double-layer PI film is coated with a transparent acrylic coating.

[0009] Furthermore, the soft-pack battery cell is fixed to both sides of each PI film by double-sided adhesive.

[0010] Furthermore, the double-sided adhesive matches the shape of one side of the double-layer PI film.

[0011] By adopting the above technical solution, this utility model has the following beneficial effects:

[0012] (1) The soft-pack battery cell of this utility model is fixed on both sides of each layer of PI film, and the two single-layer films are connected, resulting in high heating efficiency. A hollow area is provided on each layer of PI film to reduce the use of PI film material, reduce the overall weight, help improve local heat dissipation efficiency, prevent local overheating, and at the same time offset the deformation effect caused by the change in module volume, thereby improving the reliability of the heating film and extending the service life of the battery pack.

[0013] (2) The first hollow area of ​​this utility model is set in the middle of the PI film and divides each layer of PI film into two layout areas, left and right. Because the center of the soft-pack battery cell has the greatest expansion and the highest temperature, the left and right partitions can reduce the central heating area and power, and achieve the greatest degree of twisting freedom.

[0014] (3) In this utility model, the heating elements in each layout area are distributed in a serpentine shape from top to bottom. The second hollow area is set between two parallel heating elements, so that the PI film part corresponding to each heating element is only connected at the end. This allows the PI heating film body to obtain a certain degree of freedom when stretched and deformed, thereby reducing the risk of the heating element being broken by stretching.

[0015] (4) The position of the third hollow area of ​​this utility model corresponds to the second hollow area, and the connection between the third hollow area and the second hollow area is broken when subjected to force, so that the risk of the resistance wire being stretched and broken is reduced when the PI heating film body is stretched and deformed. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the double-layer PI film of this utility model.

[0019] Figure 3 This is a front structural diagram of the double-layer PI film of this utility model. Detailed Implementation

[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0021] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this utility model and should not be used to limit the scope of protection of this utility model.

[0026] (Example 1)

[0027] See Figure 1-3 This embodiment of the PI heating film system assembly for soft-pack battery modules includes a heating film body and a soft-pack battery 1. The heating film body includes a heating element 2 and a double-layer PI film 3 covering the heating element 2. The two single-layer films of the double-layer PI film 3 are connected. The soft-pack battery 1 is fixed on both sides of each PI film. In this embodiment, the soft-pack battery 1 is fixed on both sides of each PI film by double-sided adhesive. Each PI film has a cutout area 4, which is set away from the heating element 2. The large surface of the soft-pack battery 1 is relatively flat and has a large contact area, which is suitable for pasting the PI heating film. Therefore, the soft-pack battery 1 is fixed on both sides of each PI film by double-sided adhesive, and the two single-layer films are connected, resulting in high heating efficiency.

[0028] Specifically, the hollowed-out area 4 includes a first hollowed-out area 4-1, a second hollowed-out area 4-2, and a third hollowed-out area 4-3. The first hollowed-out area 4-1 is located in the middle of the PI film and divides each layer of PI film into two left and right layout areas 3-1. Because the center of the soft-pack battery cell 1 has the greatest expansion and the highest temperature, the left and right partitions can reduce the central heating area and power, while also achieving the maximum degree of torsion freedom. The heating element 2 in each layout area 3-1 is distributed in a serpentine pattern from top to bottom, and the heating elements 2 of the two layout areas 3-1 are connected at the bottom, connecting the two single-layer films. Thus, the heating elements 2 between the double-layer PI films 3 are arranged in series, resulting in high heating efficiency. The second hollow area 4-2 is set between two parallel heating elements 2. The parallel heating elements 2 can be regarded as a small segment. In this embodiment, the PI film portion corresponding to each heating element 2 is only connected at the end, so that the PI heating film body can obtain a certain degree of freedom when stretched and deformed, thereby reducing the risk of the heating element 2 being broken by stretching.

[0029] The third hollow area 4-3 is located at the edge of the layout area 3-1. In this embodiment, the position of the third hollow area 4-3 corresponds to the second hollow area 4-2, and the connection between the third hollow area 4-3 and the second hollow area 4-2 is broken when force is applied. The position of the third hollow area 4-3 corresponds to the second hollow area 4-2, and the connection between the third hollow area 4-3 and the second hollow area 4-2 is broken when force is applied, thereby reducing the risk of the heating element 2 breaking under tension when the PI heating film body is stretched and deformed.

[0030] The double-layer PI film 3 includes a connecting part, and each layer of PI film is provided with a terminal 3-2. The heating element 2 is arranged in series, and each end is connected to a terminal 3-2. One end of the heating element 2 is connected to the terminal 3-2 of one layer of PI film, and the other end is connected to the terminal 3-2 of the other layer of PI film after passing through the connecting part. The main body is disposed in the double-layer PI film 3.

[0031] The double-sided adhesive matches the shape of one side of the double-layer PI film 3, thus avoiding the hollow area 4. This allows the connection between the third hollow area 4-3 and the second hollow area 4-2 to be broken as designed when the battery cell expands and stretches, thereby protecting the heating element 2 from excessive tensile stress and preventing breakage.

[0032] The surface of the double-layer PI film 3 is coated with transparent acrylic. The use of transparent acrylic coating ensures that it does not peel off under long-term high temperature conditions of 145°C, and guarantees good contact tightness, thereby achieving maximum heat conduction efficiency.

[0033] A copper core wire with high-temperature resistant silicone insulation is used to solder to the pads of the heating element 2 and wrapped with an insulating silicone sheet. It is used with a crimp-type quick-connect single-core connector to achieve minimal contact resistance.

[0034] This invention features a hollowed-out area 4 on each PI film layer, which reduces the amount of PI film material used, lowers the overall weight, helps improve local heat dissipation efficiency, prevents local overheating, and can also offset the deformation effect caused by changes in module volume, thereby improving the reliability of the heating film and extending the service life of the battery pack.

[0035] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A PI heating film system assembly suitable for soft-pack battery cell modules, characterized in that: The device includes a heating film body and a soft-pack battery cell (1). The heating film body includes a heating element (2) and a double-layer PI film (3) covering the heating element (2). The two single-layer films of the double-layer PI film (3) are connected. The soft-pack battery cell (1) is fixed on both sides of each layer of PI film. Each layer of PI film is provided with a hollow area (4), which is set away from the heating element (2).

2. The PI heating film system assembly for soft-pack battery cell modules according to claim 1, characterized in that: The hollow area (4) includes a first hollow area (4-1), a second hollow area (4-2), and a third hollow area (4-3). The first hollow area (4-1) is located in the middle of the PI film and divides each layer of PI film into two layout areas (3-1) on the left and right. In each layout area (3-1), the heating elements (2) are distributed in a serpentine pattern from top to bottom, and the heating elements (2) of the two layout areas (3-1) are connected at the bottom. The second hollow area (4-2) is located between two parallel heating elements (2), and the third hollow area (4-3) is located at the edge of the layout area (3-1).

3. The PI heating film system assembly for soft-pack battery modules according to claim 2, characterized in that: The third hollow area (4-3) is positioned corresponding to the second hollow area (4-2), and the connection between the third hollow area (4-3) and the second hollow area (4-2) is broken when force is applied.

4. The PI heating film system assembly for soft-pack battery cell modules according to claim 1, characterized in that: The double-layer PI film (3) includes a connecting part, which includes two terminals (3-2). Each layer of PI film is provided with a terminal (3-2). The heating element (2) is arranged in series, and its two ends are respectively connected to a terminal (3-2).

5. The PI heating film system assembly for soft-pack battery cell modules according to claim 1, characterized in that: The surface of the double-layer PI film (3) is coated with transparent acrylic.

6. The PI heating film system assembly for soft-pack battery cell modules according to claim 1, characterized in that: The soft-pack battery cell (1) is fixed to both sides of each PI film by double-sided adhesive.

7. A PI heating film system assembly suitable for soft-pack battery cell modules according to claim 6, characterized in that: The double-sided adhesive matches the shape of one side of the double-layer PI film (3).

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