Narrow and long PTC (Positive Temperature Coefficient) heating film

Abstract

A narrow and long PTC heating film comprises a long-strip-shaped base film, two sets of conductive silver paste lines and a plurality of heating carbon paste lines, wherein the two sets of conductive silver paste lines and the heating carbon paste lines are arranged on the base film. The conductive silver paste line comprises a silver main line extending in the length direction of the base film, at least one first silver branch line extending in the width direction of the base film and connected to the silver main line, and a plurality of second silver branch lines extending in the length direction and connected to the first silver branch lines. The multiple second silver branch lines are arranged at intervals in the width direction, and the ends, away from the silver main line, of the first silver branch lines and the ends, away from the first silver branch lines, of the second silver branch lines are non-connection interval ends. The two groups of silver main lines are respectively arranged at two long side edges of the base film, the two groups of first silver branch lines are alternately arranged along the length direction, and the two groups of second silver branch lines are alternately arranged along the width direction; the heating carbon paste lines extend in the width direction and are connected in parallel with all the second silver branch lines in the direction, the two ends of each heating carbon paste line are connected to the inner sides of the two sets of silver main lines respectively, and the multiple heating carbon paste lines are arranged at intervals in the length direction. Compared with the prior art, the heating film improves the heating area and the heating effect.

Description

Technical Field

[0001] This utility model belongs to the field of PTC heating film technology, specifically relating to a narrow and long PTC heating film. Background Technology

[0002] In the field of new energy, to ensure battery performance in low-temperature environments, batteries need to be preheated before starting up; otherwise, the battery may be damaged. Currently, the mainstream method is to heat the battery using an electric heating film. PTC heating film is a new type of electric heating film, printed from silver paste and carbon paste. The silver paste acts as a current conductor, while the carbon paste is the heating module with the PTC effect.

[0003] Traditional PTC heating films have silver main lines 10 distributed horizontally, silver branch lines 20 distributed vertically, and carbon paste lines 30 distributed horizontally (e.g., Figure 1 (As shown). However, in narrow and long PTC heating films (width less than 100mm, aspect ratio greater than 2), the layout results in a small proportion of the heating area to the overall area, limiting heating efficiency and utilization of the heating area. For example, in a heating film with a width of 60mm, the width of the carbon paste that can be laid is 60mm - distance from the film boundary to the silver main line (4-5mm)*2 - width of the silver main line (6-12mm)*2 - distance between the silver main line and the silver branch line (1.5-6mm)*2 = 28mm. In this heating film, a large space between the silver main line and the silver branch line is not utilized, which reduces the space utilization rate and affects the heating effect. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a narrow and long PTC heating film.

[0005] To achieve the above objectives, this utility model discloses a narrow and long PTC heating film, comprising a long strip-shaped base film, two sets of independent conductive silver paste lines disposed on the base film, and multiple heating carbon paste lines;

[0006] The conductive silver paste wire includes a silver main wire, at least one first silver branch wire, and multiple second silver branch wires;

[0007] The silver main line extends along the length of the basement membrane;

[0008] The first silver branch extends along the width direction of the base film and connects to the silver main line;

[0009] The second silver branch extends along the length direction and is connected to the first silver branch. Multiple second silver branches are spaced apart along the width direction. The ends of the first silver branch away from the main silver line and the ends of the second silver branch away from the first silver branch are both non-connecting spaced ends.

[0010] The main silver lines of the two sets of conductive silver paste lines are respectively located at the two long side edges of the base film. The first silver branches of the two sets of conductive silver paste lines are alternately arranged along the length direction, and the second silver branches of the two sets of conductive silver paste lines are alternately arranged along the width direction.

[0011] The heating carbon paste wire extends along the width direction, and it is connected in parallel to all the second silver branches in that direction. Both ends are respectively connected to the inner side of the silver main line of the two sets of conductive silver paste wires. Multiple heating carbon paste wires are arranged at intervals along the length direction.

[0012] Preferably, each silver main line has two first silver branches, and the distance between the two first silver branches on the same silver main line is greater than half the length of the silver main line.

[0013] Preferably, the distance between the two first silver branches on the same silver main line is 0.65 to 0.7 times the length of the silver main line.

[0014] Preferably, one of the first silver branches is located at the short side edge of the basement membrane, and the inner side of the first silver branch is connected to the second silver branch, while the two sides of the other first silver branch are connected to the second silver branch.

[0015] Preferably, there is one first silver branch.

[0016] Preferably, the plurality of second silver branches are arranged at equal intervals.

[0017] Preferably, the distance between the non-connecting gap end of the second silver branch and the adjacent first silver branch is 1.5mm to 4mm.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, the silver main line is connected to multiple second silver branches via at least one first silver branch line. The second silver branches extend along the length of the base film, and the heating carbon paste line extends along the width direction. It is connected in parallel to all the second silver branches in that direction and its two ends are connected to the inner side of the silver main line of two sets of conductive silver paste lines. In this way, the heating carbon paste line can be arranged in the area between the two silver main lines on the heating film, especially in the position between the silver main line and the silver branch line in the existing heating film. This improves the utilization rate in the width direction and increases the heating area and heating effect.

[0020] As for the space between the heating carbon paste line and the first silver branch line, since the base film has a narrow and long structure with a small width, the distance between the two is short. This area is smaller than the area used between the existing silver main line and silver branch line, which increases the heating area of ​​the entire heating film overall.

[0021] The spacing between two adjacent heating carbon pastes can be the same as the spacing between carbon pastes in existing heating films, so the spacing between two adjacent heating carbon pastes will not affect the heating area. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a PTC heating film in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of the narrow and long PTC heating film in the embodiment;

[0024] Figure 3 for Figure 2 Schematic diagram of the structure of the conductive silver paste wire;

[0025] Figure 1 Note: Silver main line 100; Silver branch line 200; Carbon paste line 300;

[0026] Figures 2-3 Notes: Base film 10; Conductive silver paste wire 20; Silver main wire 21; First silver branch wire 22; Second silver branch wire 23; Non-connecting spacer end 30; Heating carbon paste wire 40; Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] A narrow and elongated PTC heating film, see Figures 2-3The system includes a long strip-shaped base film 10, two sets of independent conductive silver paste lines 20 disposed on the base film 10, and multiple heating carbon paste lines 40. Each conductive silver paste line 20 includes a main silver line 21, at least one first silver branch line 22, and multiple second silver branch lines 23. The main silver line 21 extends along the length of the base film 10; the first silver branch line 22 extends along the width of the base film 10 and connects to the main silver line 21; the second silver branch lines 23 extend along the length and connect to the first silver branch line 22, and the multiple second silver branch lines 23 are spaced apart along the width. The ends of the first silver branch lines 22 and the second silver branch lines 23 that are away from the main silver line 21 are both non-connected free ends 30. These non-connected free ends do not connect to the other set of conductive silver paste lines 20 but are spaced apart. The main silver lines 21 of the two sets of conductive silver paste lines 20 are respectively located at the two long side edges of the base film 10. The first silver branches 22 of the two sets of conductive silver paste lines 20 are alternately arranged along the length direction, and the second silver branches 23 of the two sets of conductive silver paste lines 20 are alternately arranged along the width direction. The heating carbon paste line 40 extends along the width direction, connects in parallel to all the second silver branches 23 in this direction, and its two ends are respectively connected to the inner side of the main silver lines 21 of the two sets of conductive silver paste lines 20. Multiple heating carbon paste lines 40 are spaced apart along the length direction.

[0029] In the PTC heating film of this embodiment, the silver main line 21 is connected to multiple second silver branches 23 via at least one first silver branch line 22. The second silver branch lines 23 extend along the length direction of the base film 10, and the heating carbon paste line 40 extends along the width direction, connecting in parallel to all the second silver branches 23 in that direction and connecting at both ends to the inner side of the silver main line 21 of the two sets of conductive silver paste lines 20. Thus, the heating carbon paste line 40 can be arranged in the area between the two silver main lines 21 on the heating film, especially in the position between the silver main line 21 and the silver branch line in the existing heating film. This improves the utilization rate in the width direction and increases the heating area and heating effect. As for the space between the heating carbon paste line 40 and the first silver branch line 22, since the base film 10 has a narrow and long structure with a small width, the distance between the two is short. This area is smaller than the area utilized between the existing silver main line 21 and the silver branch line, thus increasing the overall heating area of ​​the heating film. The spacing between two adjacent heating carbon pastes can be the same as the spacing between carbon pastes in existing heating films, so the spacing between two adjacent heating carbon pastes will not affect the heating area.

[0030] In this preferred embodiment, the main silver line 21 is perpendicular to the first silver branch line 22, and the first silver branch line 22 is perpendicular to the second silver branch line 23.

[0031] The conductive silver paste line 20 and the heating carbon paste line 40 are printed onto the base film 10 by screen printing.

[0032] In this embodiment, there are two first silver branch lines 22 on the same silver main line 21. Setting two first silver branch lines 22 can distribute the total current, so that the current of the branch lines is not too large, and the width does not need to be set as wide as the silver main line 21, so as not to occupy too much distance in the length direction, making the heating film suitable for high current scenarios. The distance between the two first silver branch lines 22 located on the same silver main line 21 is greater than half the length of the silver main line 21, so the distribution of the first silver branch lines 22 of the two sets of conductive silver paste lines 20 is reasonable.

[0033] Preferably, the distance between the two first silver branches 22 located on the same silver main line 21 is 0.65 to 0.7 times the length of the silver main line 21.

[0034] Preferably, of the two first silver branches 22, one of the first silver branches 22 is located on the short side edge of the basement membrane 10, and the inner side of the first silver branch 22 is connected to the second silver branch 23, and the two sides of the other first silver branch 22 are connected to the second silver branch 23.

[0035] In another implementation, there is only one first silver branch line 22. For scenarios with low current carrying capacity, only this type of heating film with only one first silver branch line 22 can be provided.

[0036] In this embodiment, the multiple second silver branches 23 are arranged at equal intervals.

[0037] In this embodiment, the distance between the non-connection gap end 30 of the second silver branch 23 and the adjacent first silver branch 22 is 1.5mm to 4mm.

[0038] In this embodiment, the width of the second silver branch can be the same as the width of an existing silver branch, and the width of the first silver branch is 4-5 times the width of the second silver branch. For example, in this embodiment, the widths of the first silver branch and the second silver branch are 3mm and 0.8mm, respectively.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A narrow and elongated PTC heating film, comprising an elongated base film, two sets of independent conductive silver paste lines disposed on the base film, and multiple heating carbon paste lines, characterized in that: The conductive silver paste wire includes a silver main wire, at least one first silver branch wire, and multiple second silver branch wires; The silver main line extends along the length of the basement membrane; The first silver branch extends along the width direction of the base film and connects to the silver main line; The second silver branch extends along the length direction and is connected to the first silver branch. Multiple second silver branches are spaced apart along the width direction. The ends of the first silver branch away from the main silver line and the ends of the second silver branch away from the first silver branch are both non-connecting spaced ends. The main silver lines of the two sets of conductive silver paste lines are respectively located at the two long side edges of the base film. The first silver branches of the two sets of conductive silver paste lines are alternately arranged along the length direction, and the second silver branches of the two sets of conductive silver paste lines are alternately arranged along the width direction. The heating carbon paste wire extends along the width direction, and it is connected in parallel to all the second silver branches in that direction. Both ends are respectively connected to the inner side of the silver main line of the two sets of conductive silver paste wires. Multiple heating carbon paste wires are arranged at intervals along the length direction.

2. The narrow and elongated PTC heating film according to claim 1, characterized in that: Each silver main line has two first silver branches, and the distance between the two first silver branches on the same silver main line is greater than half the length of the silver main line.

3. The narrow and elongated PTC heating film according to claim 2, characterized in that: The distance between the two first silver branches on the same silver main line is 0.65 to 0.7 times the length of the silver main line.

4. The narrow and elongated PTC heating film according to claim 3, characterized in that: One of the first silver branches is located on the short side edge of the basement membrane, and the inner side of the first silver branch is connected to the second silver branch. The other first silver branch is connected to the second silver branch on both sides.

5. The narrow and elongated PTC heating film according to claim 1, characterized in that: There is one first silver branch.

6. The narrow and elongated PTC heating film according to claim 1, characterized in that: The multiple second silver branches are set at equal intervals.

7. The narrow and elongated PTC heating film according to claim 1, characterized in that: The distance between the non-connecting gap end of the second silver branch and the adjacent first silver branch is 1.5mm to 4mm.

Images