Bending protection structure of flexible printed circuit (FPC) battery flat cable
By adding a bending reinforcement protection device at the bending point of the FPC battery cable substrate, the problem of insufficient bending guidance design is solved, achieving stable bending and fatigue resistance of the cable, preventing damage caused by excessive bending, and improving service life and conductivity stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU LUOJIAYI ELECTRONIC TECH CO LTD
- Filing Date
- 2025-10-29
- Publication Date
- 2026-04-24
AI Technical Summary
The existing bending protection structure of FPC battery cables lacks a dedicated bending guidance design, which makes the cable prone to trajectory deviation and local stress concentration when bending. After long-term use, the substrate is prone to cracking and the copper foil may break. Furthermore, it cannot limit the excessive bending angle.
A bending reinforcement protection device is added to the bending point of the ribbon cable substrate, including a bending guide groove and a side elastic fixing strip. Combined with a bending protection patch and a contact restriction structure, the device limits excessive bending, disperses stress, and ensures a stable bending trajectory through elastic design and buffer structure.
It effectively limits the bending angle of the cabling, reduces stress concentration, prevents substrate cracking and copper foil breakage, extends service life, and ensures conductivity stability.
Smart Images
Figure CN224164099U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of flexible electronic components, specifically relating to a bending protection structure for FPC battery cables. Background Technology
[0002] The bending protection structure of FPC battery cables is a key auxiliary structure for protecting flexible printed circuit battery cables. It is adapted to electronic devices such as laptops, foldable screen phones, and smart wearable devices that require frequent opening and closing or have tight spaces. Its core function is to reduce fatigue damage caused by repeated bending of the cables by adding protective components in areas where bending is common, avoid internal copper foil breakage or substrate cracking, and ensure stable transmission of battery power supply signals.
[0003] However, most existing FPC battery cable bending protection structures only enhance the strength of the cable bending point with a single patch, lacking a dedicated bending guidance design. When the cable is bent, the trajectory is prone to deviate, leading to local stress concentration. After long-term use, problems such as substrate cracking and copper foil breakage still occur. Moreover, the existing structure cannot effectively limit the bending angle. When the opening angle of the equipment is too large, the cable may be bent to an excessive angle such as 90 degrees, directly damaging the internal conductive structure. Utility Model Content
[0004] The purpose of this utility model is to provide a bending protection structure for FPC battery cables, in order to solve the problem that most of the existing bending protection structures for FPC battery cables mentioned in the background art only enhance the strength of the bending point of the cable with a single patch, lacking a special bending guidance design. When the cable is bent, the trajectory is prone to deviate, resulting in local stress concentration. After long-term use, problems such as substrate cracking and copper foil breakage will still occur.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a bending protection structure for an FPC battery cable, comprising a strip-shaped cable substrate and multiple copper foils fixed inside it by adhesive and encapsulating glue for current conduction. Bending protection patch A and bending protection patch B are respectively pasted on the upper and lower ends of the bending point of the strip-shaped cable substrate. A bending reinforcement protection device is connected to the front and rear ends of the bending point of the strip-shaped cable substrate. The bending reinforcement protection device includes a bending guide groove and a side elastic fixing strip. Two side elastic fixing strips are provided and are respectively pasted on the front and rear ends of the bending point of the strip-shaped cable substrate. A bending guide groove is formed in the center of the side elastic fixing strip.
[0006] Preferably, the upper and lower ends of the side elastic fixing strip are flush with the outer wall of the top of the bending protective patch A and the outer wall of the bottom of the bending protective patch B, respectively, and the three are of equal length. The vertical depth of the bending guide groove is half the vertical height of the side elastic fixing strip, and the left and right inner corners at the bottom are all treated with arc corners.
[0007] Preferably, the longitudinal centerline of the bending protective patch A, bending protective patch B, side elastic fixing strip, and bending guide groove coincides with the bending point of the strip-shaped cable substrate, and the bending guide groove can adapt to the position change of the bending point of the strip-shaped cable substrate by its own length.
[0008] Preferably, the bending reinforcement protection device further includes contact limiting discs and contact limiting main pieces. The contact limiting main pieces are pasted to the top of the two side elastic fixing strips, and its left and right ends are respectively flush with the outer wall of the left end of the side elastic fixing strips and the inner wall of the left end of the bending guide groove. Multiple contact limiting discs are integrally formed at equal intervals on the top of the contact limiting main pieces.
[0009] Preferably, the contact limiting disc and the contact limiting main piece are made of the same material as the side elastic fixing strip. The contact limiting disc and the contact limiting main piece are hollow inside and connected to each other. When the strip-shaped ribbon cable substrate is bent at a large angle in a horizontally straight state, the contact limiting disc contacts the outer wall of the top of the right half of the bending protection patch A through the contact limiting main piece, which will prevent the strip-shaped ribbon cable substrate from continuing to bend, thereby limiting the strip-shaped ribbon cable substrate from being bent into a ninety-degree angle.
[0010] Preferably, the bending reinforcement protection device further includes multiple elastic protective strips at the bend, which are fixed at equal intervals to the right end of the contact limiting main piece, and the elastic protective strips at the bend are of the same length as the bending guide groove. When the strip-shaped ribbon cable substrate is in a horizontally straight state, the multiple elastic protective strips at the bend are all attached to the outer wall of the top of the bending protection patch A.
[0011] Preferably, the bending protection patch A and the bending protection patch B are provided with reinforcing patches at the four corners of both ends, and multiple reinforcing patches are respectively pasted on the outer walls of the upper and lower ends of the strip-shaped cable substrate. The reinforcing patches, bending protection patch A and bending protection patch B are all made of polyimide.
[0012] Compared with the prior art, this utility model provides a bending protection structure for FPC battery cables, which has the following beneficial effects:
[0013] This invention adds a bending reinforcement protection device to both ends of the bending point of the strip-shaped ribbon cable substrate. This device enhances the fatigue resistance of the bending point and limits excessive bending. At the same time, the device utilizes its own elasticity and buffer structure to reduce bending damage to the strip-shaped ribbon cable substrate and its internal copper foil, thereby ensuring the conductivity stability and service life of the FPC battery ribbon cable. Specifically, the side elastic fixing strip and the elastic protective strip at the bending point of the bending reinforcement protection device are both elastic. When the strip-shaped ribbon cable substrate is bent, the elastic material can generate buffer with the bending deformation, disperse the bending stress, and avoid stress concentration that could lead to breakage of the strip-shaped ribbon cable substrate or its internal copper foil. Meanwhile, the side elastic fixing strip reinforces the structure of the bending area and improves the bending strength by adhering to both ends of the bending point.
[0014] The contact limiting main plate and the contact limiting disc of this device work together to limit the bending angle of the strip-shaped ribbon cable substrate. When the ribbon cable is bent at a large angle, the contact limiting disc contacts the outer wall of the top right half of the bending protection patch A through the contact limiting main plate. The thickness of both blocks the ribbon cable from bending further, effectively preventing the ribbon cable from being bent to an excessive angle such as 90 degrees, preventing the substrate from cracking or the copper foil from being damaged. Furthermore, the contact limiting disc and the contact limiting main plate are hollow and interconnected. When the contact limiting disc contacts the bending protection patch A, the hollow structure can further absorb the contact impact force, forming a secondary buffer, reducing the damage of hard contact to the bending protection patch A and the strip-shaped ribbon cable substrate, while also preventing deformation of the contact area due to long-term compression. Attached Figure Description
[0015] Figure 1 This is a front-view three-dimensional structural diagram of a bending protection structure for an FPC battery cable according to the present invention.
[0016] Figure 2 This is a three-dimensional disassembly diagram of a bending protection structure for an FPC battery cable according to the present invention.
[0017] Figure 3 This is a three-dimensional structural diagram of the bending reinforcement protection device of this utility model in use.
[0018] Figure 4 This is a three-dimensional structural diagram of the bending reinforcement protection device of this utility model in its disassembled state.
[0019] In the diagram: 1. Strip cable substrate; 2. Reinforcing patch; 3. Bending reinforcement protection device; 4. Bending protection patch A; 5. Bending protection patch B; 6. Elastic protective strip at the bend; 7. Bending guide groove; 8. Contact limiting disc; 9. Contact limiting main piece; 10. Elastic fixing strip on the side. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] This utility model provides, for example Figure 1-4 The diagram illustrates a bend protection structure for an FPC battery cable, comprising a strip-shaped cable substrate 1 and multiple copper foils fixed within it by adhesive and encapsulant. The copper foils serve as the conductive core for current transmission. To prevent cracking or copper foil breakage during bending, bend protection patches A4 and B5 are respectively attached to the upper and lower ends of the bend in the strip-shaped cable substrate 1. Both patches are made of polyimide, a material with excellent high-temperature resistance and bending resistance, which directly enhances the fatigue strength of the substrate at the bend and reduces the risk of cracking. To mitigate the damage to the substrate caused by repeated bending, reinforcement patches 2 are provided at the four corners of both ends of the bending protection patches A4 and B5. Multiple reinforcement patches 2 are respectively attached to the outer walls of the upper and lower ends of the strip cable substrate 1, and they are also made of polyimide. The four corners are areas where stress is easily concentrated during bending. By covering these weak points, the reinforcement patches 2 further improve the connection stability between the bending protection patches A4 and B5 and the strip cable substrate 1, preventing the edges of the patches from curling up due to bending and ensuring the continued effectiveness of the basic protective layer.
[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, to further optimize the bending protection effect, bending reinforcement protection devices 3 are connected to the front and rear ends of the bending point of the strip-shaped cable substrate 1. The bending reinforcement protection device 3 includes two side elastic fixing strips 10, which are respectively pasted to the front and rear ends of the bending point of the strip-shaped cable substrate 1. The upper and lower ends of the side elastic fixing strips 10 are flush with the top outer wall of the bending protection patch A4 and the bottom outer wall of the bending protection patch B5, respectively. All three are of equal length. The flush design allows the side elastic fixing strips 10 to form a complete protective whole with the base protective layer, avoiding stress concentration caused by local protrusions. A bending guide groove 7 is opened in the center of the side elastic fixing strip 10, and its vertical depth is the side elastic... The vertical height of the fixing strip 10 is half of the bottom left and right inner corners, which are all treated with arc corners. When the strip-shaped cable substrate 1 is bent, the bending guide groove 7 can provide a stable bending trajectory for the cable, guide the cable to deform along the direction of the groove, and avoid uneven local stress caused by bending deviation. The bending guide groove 7 can adapt to the position change of the bending angle by its own length. The longitudinal center lines of the bending protection patch A4, bending protection patch B5, side elastic fixing strip 10 and bending guide groove 7 all coincide with the bending point of the strip-shaped cable substrate 1. This can ensure that all protective components act on the core bending area, making the protective effect of the bending reinforcement protection device 3 more concentrated.
[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the contact limiting main piece 9 is attached to the top of the two side elastic fixing strips 10. Its left and right ends are flush with the outer wall of the left end of the side elastic fixing strip 10 and the inner wall of the left end of the bending guide groove 7, respectively. The alignment of the two ends can avoid the contact limiting main piece 9 protruding and causing additional friction. Multiple contact limiting discs 8 are integrally formed at equal intervals on the top of the contact limiting main piece 9. The contact limiting discs 8, the contact limiting main piece 9 and the side elastic fixing strips 10 are made of the same material and are all elastic. At the same time, the two are hollow inside and interconnected. When the horizontally straight strip-shaped ribbon cable substrate 1 is bent at a large angle, as As the bending angle increases, the contact limiting disc 8 gradually approaches the outer wall of the top right half of the bending protection patch A4 through the contact limiting main disc 9. When the contact limiting disc 8 contacts the outer wall of the bending protection patch A4, the structural thickness of both will prevent the strip-shaped cable substrate 1 from continuing to bend, thereby limiting the cable from being bent at a 90-degree angle to avoid excessive bending that could cause copper foil breakage and substrate cracking. At the same time, the hollow structure of the contact limiting disc 8 and the main disc can absorb the impact force at the moment of contact, forming a buffer and reducing the squeezing damage to the bending protection patch A4 and the strip-shaped cable substrate 1 caused by hard contact, thus extending the service life of the component.
[0024] like Figure 1 , Figure 3 and Figure 4As shown, the bending reinforcement protection device 3 also includes multiple elastic protective strips 6 at the bends, which are fixed at equal intervals to the right end of the contact limiting main piece 9 and are the same length as the bending guide groove 7. When the strip-shaped ribbon cable substrate 1 is in a horizontally straight state, the multiple elastic protective strips 6 at the bends are all attached to the outer wall of the top of the bending protection patch A4. The attachment design can form a slight pressure on the bending protection patch A4 when the ribbon cable is not bent, enhancing the adhesion between the patch and the substrate. When the ribbon cable is bent, the elastic protective strips 6 at the bends will generate elastic tension with the bending deformation, further dispersing the bending stress, while avoiding the local stress concentration caused by the gap between the contact limiting main piece 9 and the bending protection patch A4, forming a double elastic protection with the side elastic fixing strip 10.
[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 bending protection structure for an FPC battery cable, comprising a strip-shaped cable substrate (1) and multiple copper foils fixed inside it by adhesive and encapsulant for conducting current, wherein bending protection patches A (4) and B (5) are respectively pasted on the upper and lower ends of the bending point of the strip-shaped cable substrate (1), characterized in that: The strip-shaped cable substrate (1) has bending reinforcement protection devices (3) connected to both ends of the bending point; The bending reinforcement protection device (3) includes a bending guide groove (7) and a side elastic fixing strip (10). The side elastic fixing strip (10) has two strips and is respectively attached to the front and rear ends of the bending point of the strip-shaped cable substrate (1). The bending guide groove (7) is opened in the center of the side elastic fixing strip (10).
2. The bending protection structure for an FPC battery cable according to claim 1, characterized in that: The upper and lower ends of the side elastic fixing strip (10) are flush with the top outer wall of the bending protective patch A (4) and the bottom outer wall of the bending protective patch B (5), respectively, and the three are of equal length. The vertical depth of the bending guide groove (7) is half of the vertical height of the side elastic fixing strip (10), and the left and right inner corners at its bottom are all treated with arc corners.
3. The bending protection structure for an FPC battery cable according to claim 2, characterized in that: The longitudinal center lines of the bending protection patch A (4), bending protection patch B (5), side elastic fixing strip (10) and bending guide groove (7) coincide with the bending point of the strip-shaped cable substrate (1). The bending guide groove (7) can adapt to the position change of the bending point of the strip-shaped cable substrate (1) by its own length.
4. The bending protection structure for an FPC battery cable according to claim 3, characterized in that: The bending reinforcement protection device (3) also includes a contact limiting disc (8) and a contact limiting main piece (9). The contact limiting main piece (9) is pasted on the top of two side elastic fixing strips (10), and its left and right ends are flush with the outer wall of the left end of the side elastic fixing strip (10) and the inner wall of the left end of the bending guide groove (7), respectively. Multiple contact limiting discs (8) are integrally formed at equal intervals on the top of the contact limiting main piece (9).
5. The bending protection structure for an FPC battery cable according to claim 4, characterized in that: The contact limiting disc (8) and the contact limiting main piece (9) are made of the same material as the side elastic fixing strip (10). The contact limiting disc (8) and the contact limiting main piece (9) are hollow inside and connected to each other. When the strip-shaped ribbon cable substrate (1) in a horizontally straight state is bent at a large angle, the contact limiting disc (8) contacts the outer wall of the top right half of the bending protection patch A (4) through the contact limiting main piece (9), which will prevent the strip-shaped ribbon cable substrate (1) from continuing to bend, so as to limit the strip-shaped ribbon cable substrate (1) from being bent into a ninety-degree angle.
6. The bending protection structure for an FPC battery cable according to claim 5, characterized in that: The bending reinforcement protection device (3) also includes multiple elastic protective rubber strips (6) at the bend, which are fixed at equal intervals to the right end of the contact limiting main piece (9), and the elastic protective rubber strips (6) at the bend are the same length as the bending guide groove (7). When the strip-shaped ribbon cable substrate (1) is in a horizontally straight state, the multiple elastic protective rubber strips (6) at the bend are all attached to the top outer wall of the bending protection patch A (4).
7. The bending protection structure for an FPC battery cable according to claim 1, characterized in that: The bending protection patch A (4) and bending protection patch B (5) are provided with reinforcement patches (2) at the four corners of both ends, and multiple reinforcement patches (2) are respectively pasted on the outer walls of the upper and lower ends of the strip cable substrate (1). The reinforcement patches (2), bending protection patch A (4) and bending protection patch B (5) are all made of polyimide.