An integrated stretchable FPC component and its manufacturing method

Abstract

The present application relates to a kind of integral stretchable FPC assembly and its manufacturing method.The integral stretchable FPC assembly can include FPC sampling line, isolation plate and busbar, the busbar is fixedly installed on the isolation plate, the FPC sampling line has S-shaped stretch zone and its both ends are positioned and assembled on the isolation plate and are welded with the busbar, so as to form the integral stretchable assembly, the integral stretchable assembly is stretched when being assembled to soft package battery module and is restored after assembly is completed.FPC sampling line and busbar both ends are welded in the same plane, and the process flow is short, while welding process is separated from battery module, there is no process risk, production difficulty is low, and it is easy to realize automatic assembly, can greatly reduce production cost, improve production efficiency and product yield.

Description

Technical Field

[0001] The present invention relates to the field of soft-pack batteries, and in particular to an integrated stretchable FPC component and a manufacturing method thereof. Background Art

[0002] Due to the special structure of new energy soft-pack batteries, the busbars are generally located on both sides of the battery module. If the conventional FPC sampling line is made into an integrated component with the isolation plate and busbar, it cannot be assembled to the battery module. The existing assembly process of the FPC sampling line and the battery module is as follows: 1. Install the busbar into the isolation plate; 2. Assemble the isolation plate with the busbar on both sides of the battery module; 3. Assemble the FPC sampling line to the isolation plate; 4. Weld the two ends of the FPC sampling line to the busbar in steps. Since step-by-step assembly and welding are required on the battery module, the process is complicated, and the two sides of the sampling line and the busbar are not on the same plane when welding, making it difficult to achieve automated operation and low production efficiency. At the same time, welding the sampling line on the battery cell module can easily cause abnormal short circuits in the battery cell, making the product and battery pack scrapped, with high production risks, low yields, and high costs. Summary of the Invention

[0003] The present invention aims to provide an integrated stretchable FPC assembly to solve the above problems. To this end, the specific technical solutions adopted by the present invention are as follows:

[0004] According to one aspect of the present invention, an integrated stretchable FPC assembly is provided, which may include an FPC sampling line, an isolation plate and a busbar, wherein the busbar is fixedly mounted on the isolation plate, the FPC sampling line has an S-shaped stretching area and its two ends are positioned and assembled on the isolation plate and welded to the busbar for conduction, thereby forming the integrated stretchable assembly, which is stretched when assembled on a soft-pack battery cell module and recovers after assembly is completed.

[0005] Furthermore, the S-shaped stretching area is located in the middle of the FPC sampling line.

[0006] Furthermore, the stretching range of the S-shaped stretching zone is 0-5 cm.

[0007] Furthermore, the S-shaped stretching zone has two slits with opposite opening directions, and the closed ends of the slits are provided with anti-tear holes.

[0008] Furthermore, a reinforcing plate is attached around the anti-tear hole.

[0009] Furthermore, the reinforcing plate is made of PI, PET or FR4.

[0010] Furthermore, positioning holes are provided at both ends of the FPC sampling line, and the positioning holes cooperate with the positioning posts on the isolation plate to achieve positioning assembly with the isolation plate.

[0011] Furthermore, the busbar is fixed to the isolation plate by snap fastening, hot riveting or double-sided tape.

[0012] Furthermore, the FPC sampling line may be a single-sided or double-sided flexible circuit board, preferably a single-sided flexible circuit board.

[0013] According to another aspect of the present invention, a method for manufacturing an integrated stretchable FPC assembly is provided, which may include the following steps:

[0014] Provide an FPC sampling line, an isolation plate, and a busbar, wherein the FPC sampling line has an S-shaped stretching area and a positioning hole, the S-shaped stretching area has two slits with opposite opening directions, the closed end of the slit is provided with an anti-tear hole, and a reinforcing plate is attached around the anti-tear hole;

[0015] Assembling and fixing the busbar into the isolation plate;

[0016] Assemble the FPC sampling line onto the isolation plate by fitting it into the positioning hole and into the positioning post of the isolation plate;

[0017] The FPC sampling line is connected to the bus bar by welding the connecting piece of the FPC sampling line to the bus bar, thereby forming the integrated stretchable component.

[0018] The present invention adopts the above technical solution, which has the beneficial effects of: the FPC sampling line and the two ends of the bus are welded on the same plane, the process flow is short, and the welding process is separated from the battery core module. There is no process risk, the production difficulty is low, and it is easy to realize automated assembly, which can greatly reduce production costs and improve production efficiency and product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0020] Figure 1 is a schematic diagram of an integrated stretchable FPC assembly of the present invention;

[0021] Figure 2 yes Figure 1Schematic diagram of the FPC acquisition line of the integrated stretchable FPC assembly shown;

[0022] Figure 3 yes Figure 1 Schematic diagram of the integrated stretchable FPC assembly being assembled to a battery module;

[0023] Figure 4 yes Figure 1 Schematic diagram of the integrated stretchable FPC assembly after being assembled to the battery module. DETAILED DESCRIPTION

[0024] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of this application, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0026] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 and 2As shown, an integrated stretchable FPC assembly may include an FPC sampling line 1, two isolation plates 2 and two bus bars 3. The bus bar 3 is fixedly mounted on the isolation plate 2 and may be fixed by means of snaps, hot riveting or double-sided tape. The structures of the isolation plate 2 and the bus bar 3 are well known and will not be described here. The FPC sampling line 1 may be a single-sided or double-sided flexible circuit board, preferably a single-sided flexible circuit board to reduce costs. Connecting pieces 11 welded to the bus bars 3 are provided at both ends of the FPC sampling line 1. A connector 12 and an NTC temperature sensor 13 are also mounted on the FPC sampling line 1. The connecting piece 11, the connector 12 and the NTC temperature sensor 13 are well known and will not be described here. An S-shaped stretching zone 14 is provided in the middle position of the FPC sampling line 1. It should be understood that the S-shaped stretching zone 14 is not necessarily provided in the middle position. The two ends of the FPC sampling line 1 are provided with positioning holes 15. The two ends of the FPC sampling line 1 are positioned and assembled on the isolation plate 3 through the positioning holes 15 and the positioning posts on the isolation plate 3. The connecting piece 11 is welded (for example, laser welding) to the bus 3 and is connected to the bus 3, thereby forming an integrated stretchable component. When the integrated stretchable component is assembled to the soft-pack battery module 100, the S-shaped stretching area 14 of the FPC sampling line 1 is stretched (that is, pulled open along the slit 141), so that the isolation plate 2 and the bus 3 can be assembled to both sides of the soft-pack battery module 100, as shown in FIG. Figure 3 When the assembly is completed, the S-shaped stretching area 14 returns to a flat state without affecting the overall structural design of the module, as shown Figure 4 The integrated stretchable component is simple and convenient to install and can be easily automated, thereby improving the production efficiency and product yield of soft-pack batteries.

[0029] The stretching length of the FPC sampling line 1 (specifically, the S-shaped stretching zone 14) is designed to facilitate the automated assembly of the soft-pack battery. For example, during assembly, the FPC sampling line 1 can be stretched by about 5 cm, that is, each side extends about 2.5 cm beyond the battery module 100, thereby ensuring sufficient assembly space.

[0030] like Figure 2As shown, the S-shaped stretching zone 14 has two slits 141 with opposite opening directions, and the slit 141 is L-shaped. That is, the S-shaped stretching zone 14 is formed by laser cutting an L-shaped slit 141 in opposite directions on both sides of the FPC sampling line 1. The width of the slit 141 can be about 1 mm. Preferably, the closed end of the slit 141 is provided with an anti-tear hole 142. The anti-tear hole 142 can prevent the formation of a stress concentration point at the end of the slit 141 when the FPC sampling line 1 is stretched, which causes easy tearing, thereby improving the product yield. The aperture of the anti-tear hole 142 is about 2 mm. Preferably, a reinforcing plate 143 is attached around the anti-tear hole 142 to further increase the tear resistance of the FPC sampling line 1. The reinforcing plate 143 can be made of materials such as PI, PET or FR4. The thickness of the reinforcing plate 143 is about 0.25 mm.

[0031] The following briefly describes the method for making the integrated stretchable FPC assembly, which may include the following steps:

[0032] 1. Provide the FPC sampling line 1, isolation plate 2 and busbar 3 as described above;

[0033] 2. Assemble and fix the busbar 3 into the isolation plate 2;

[0034] 3. Assemble the FPC sampling line 1 onto the isolation plate 2 by fitting its positioning holes with the positioning posts of the isolation plate;

[0035] 4. The FPC sampling line 1 is connected to the bus bar 3 by welding the connecting piece of the FPC sampling line 1 to the bus bar 2, thereby forming the integrated stretchable component.

[0036] The FPC sampling lines 1 and the busbars 2 at both ends are welded on the same plane, which shortens the process flow. At the same time, the welding process is separated from the battery module, which eliminates process risks, reduces production difficulty, and greatly reduces production costs.

[0037] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. An integrated stretchable FPC assembly, characterized in that: It includes an FPC sampling line, an isolation plate and a busbar, wherein the busbar is fixedly mounted on the isolation plate, the FPC sampling line has an S-shaped stretching area and its two ends are positioned and assembled on the isolation plate and welded to the busbar to form the one-piece stretchable component, which is stretched when assembled on the soft-pack battery cell module and recovers after the assembly is completed; the S-shaped stretching area has two slits with opposite opening directions, and the width of the slit is 1 mm; the stretching range of the S-shaped stretching area can reach 5 cm.

2. The one-piece stretchable FPC assembly according to claim 1, wherein: The S-shaped stretching area is located in the middle of the FPC sampling line.

3. The one-piece stretchable FPC assembly according to claim 1, wherein: The closed end of the slit is provided with a tear-resistant hole.

4. The one-piece stretchable FPC assembly according to claim 3, wherein: A reinforcing plate is attached around the anti-tear hole.

5. The one-piece stretchable FPC assembly according to claim 4, wherein: The reinforcing plate is made of PI, PET or FR4.

6. The one-piece stretchable FPC assembly according to claim 1, wherein: Positioning holes are provided at both ends of the FPC sampling line, and the positioning holes cooperate with the positioning posts on the isolation plate to achieve positioning assembly with the isolation plate.

7. The FPC assembly according to claim 1, wherein: The busbar is fixed to the isolation plate by snap fastening, hot riveting or double-sided tape.

8. The FPC assembly according to claim 1, wherein: The FPC sampling line is a single-sided flexible circuit board.

9. A method for manufacturing an integrated stretchable FPC assembly, characterized in that: The following steps are involved: Provide an FPC sampling line, an isolation plate, and a busbar, wherein the FPC sampling line has an S-shaped stretching area and a positioning hole, the S-shaped stretching area has two slits with opposite opening directions, the closed end of the slit is provided with an anti-tear hole, and a reinforcing plate is attached around the anti-tear hole; Assembling and fixing the busbar into the isolation plate; Assemble the FPC sampling line onto the isolation plate by fitting it into the positioning hole and into the positioning post of the isolation plate; The FPC sampling line is connected to the bus bar by welding the connecting piece of the FPC sampling line to the bus bar, thereby forming the integrated stretchable component.

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