Flexible circuit board structure with protection function

Abstract

The utility model discloses a flexible circuit board structure with a protection function, which comprises a flexible circuit board main body and further comprises a memory metal plate laid on the flexible circuit board main body and fixedly connected with the flexible circuit board main body; the flexible circuit board comprises a flexible circuit board main body and a plurality of fixed stickers, the fixed stickers are provided with a plurality of sections, the plurality of sections of fixed stickers are distributed on two sides of the flexible circuit board main body, and hollow middle folding lines are arranged at the joints of the fixed stickers and the flexible circuit board main body. Through the arrangement of the fixed sticker and the memory metal plate, the problem of electrical connection failure possibly occurring when the battery cell swells is avoided, and the memory metal plate has good plasticity and enough strength, can be bent during installation to adapt to the environment and provide protection for the circuit board, and helps the circuit board to realize faster heat conduction.

Description

Technical Field

[0001] This utility model relates to flexible circuit boards, and more particularly to a flexible circuit board structure with protective functions, belonging to the field of flexible circuit boards used in power batteries. Background Technology

[0002] Currently, with the rapid development of new energy vehicle technology, flexible printed circuits (FPCs) are being used more and more widely in the field of battery connection. This type of circuit has broken through the traditional interconnection technology due to its excellent flexibility, lightweight and small size.

[0003] A flexible circuit board for a new energy vehicle battery, with publication number CN219718569U, discloses the following:

[0004] 1) The entire flexible circuit board has a peelable adhesive layer on the back that adheres to the battery cell, and is secured with bolts. This feature causes the circuit board to lose its original flexibility and bendability. Considering that batteries may bulge or experience vertical displacement after a period of use, the connection between the FPC and the battery cell may break or the FPC may fracture, thus creating a safety hazard.

[0005] 2) There are no structural components on the top of the flexible circuit board to protect the board from the installation environment, which further exacerbates the safety hazards. Utility Model Content

[0006] To address the shortcomings of the aforementioned technologies, this utility model provides a flexible circuit board structure with protective functions.

[0007] To solve the above technical problems, the technical solution adopted by this utility model is: a flexible circuit board structure with protective function, including a flexible circuit board body, and the flexible circuit board structure further includes:

[0008] Memory metal plate, which is laid on the flexible circuit board body and fixedly connected to the flexible circuit board body;

[0009] The fixing sticker has multiple segments, which are distributed on both sides of the flexible circuit board body. A hollowed-out fold line is provided at the connection between the fixing sticker and the flexible circuit board body.

[0010] Preferably, the flexible circuit board body is provided with PIN pin terminals and aluminum bar connection terminals around its perimeter.

[0011] The PIN pin terminal connects to the connector;

[0012] Preferably, the aluminum bar connector terminal is ultrasonically welded to the nickel sheet and then electrically connected to the aluminum bar.

[0013] Preferably, the two ends of the memory metal plate are inserted into the fixing blocks, and the fixing blocks are fixedly connected to the flexible circuit board body by bolts.

[0014] Preferably, the fixing block is provided with a fixing block groove for inserting the end of the memory metal plate.

[0015] Preferably, a U-shaped clip is also assembled between the shape memory metal plate and the flexible circuit board body.

[0016] Preferably, the U-shaped card block is interference-fitted with the memory metal plate and the flexible circuit board body.

[0017] Preferably, a protective film is provided on the sticker.

[0018] This utility model discloses a flexible circuit board structure with protective function, which has the following technical advantages compared with the prior art:

[0019] 1) The flexible circuit board body is fixed to the battery cell by the fixing stickers on both sides of the flexible circuit board. The circuit board can still bend and move in the area on both sides of the fixing stickers, thereby avoiding electrical connection failure that may occur when the battery cell bulges.

[0020] 2) The connection between the fixing sticker and the flexible circuit board body has a hollowed-out central fold line. The central fold line can easily separate the fixing sticker from the flexible circuit board body, avoiding damage to the device caused by tearing the fixing sticker when the circuit board needs to be removed.

[0021] 3) By inserting a memory metal plate, the flexible circuit board is provided with certain support and protection, thereby solving the safety hazards caused by the lack of protection in traditional flexible circuit boards.

[0022] 4) Memory metal plates are memory materials with good plasticity. They can be bent to different degrees to adapt to the installation environment and can also return to their original shape after heating for easy reuse. This allows memory metal plates to fit well with flexible circuit boards and helps the circuit boards achieve faster heat conduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is an overall view of the hidden memory metal plate of this utility model.

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0026] In the diagram: 1. Flexible circuit board body; 2. PIN pin terminal; 3. Fixing block; 3a. Block slot; 4. Memory metal plate; 5. U-shaped block; 6. Fixing sticker; 7. Aluminum bar connection terminal; 8. Center fold line; 9. Sticker protective film. Detailed Implementation

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

[0028] To address the issues of easy contact breakage and lack of protection in existing flexible circuit boards when fully bonded to battery cells, this invention provides a flexible circuit board structure with protective functions. Compared with the prior art, its main improvements are as follows:

[0029] Firstly, the flexible circuit board is fixed to the battery cell by the fixing stickers on both sides of the flexible circuit board. The circuit board can still bend and move in the area on both sides of the fixing stickers, thus avoiding the electrical connection failure problem that may occur when the battery cell bulges.

[0030] Meanwhile, a hollowed-out fold line is set at the connection between the fixing sticker and the flexible circuit board body. The fold line allows the fixing sticker to be easily separated from the flexible circuit board body, avoiding damage to the device caused by tearing the fixing sticker when the flexible circuit board needs to be removed.

[0031] Secondly, the flexible circuit board is provided with some support and protection by incorporating a shape memory metal plate. The shape memory metal plate is made of nickel-titanium alloy, which, as a shape memory material, has good plasticity and can be bent to varying degrees to adapt to the installation environment. It can also return to its original shape after being heated, making it convenient for repeated use.

[0032] Meanwhile, the thermal conductivity of the shape memory metal plate is better than that of the top insulating layer of the flexible circuit board, which can conduct the heat generated by the flexible circuit board into the air more quickly, thus helping the flexible circuit board to achieve faster heat conduction.

[0033] like Figure 1-3 As shown, the flexible circuit board structure with protective function disclosed in this utility model has the following specific structural features:

[0034] First, the flexible circuit board structure includes a flexible circuit board body 1. The flexible circuit board body 1 is made of polyimide insulating film, epoxy resin adhesive film and conductive copper foil. The flexible circuit board body 1 is obtained by calendering the polyimide insulating film, epoxy resin adhesive film and conductive copper foil, and terminals are connected and set at the same time.

[0035] like Figure 1 and Figure 2As shown, the flexible circuit board body 1 has terminals distributed on its head and both sides. The terminals on the head are PIN terminals 3, which are used to connect to the connector to transmit voltage and temperature signals to the BMS system of the battery pack for integration.

[0036] The terminals on both sides are aluminum bar connection terminals 7. After the aluminum bar connection terminals 7 are ultrasonically welded to nickel sheets with a thickness of 0.2 to 0.3 mm, the nickel sheets are then electrically connected to the aluminum bar to realize the voltage acquisition function.

[0037] It should also be noted that in the accompanying drawings of this instruction manual, the wiring terminals are only shown in multi-layer cross-sectional structures for necessary illustration.

[0038] Secondly, the flexible circuit board structure also includes a memory metal plate 4 and a fixing sticker 6.

[0039] like Figure 1 and Figure 2 As shown, the memory metal plate 4 is laid on the flexible circuit board body 1 and fixedly connected to the flexible circuit board body 1.

[0040] The shape memory metal plate 4 is mainly made of nickel-titanium alloy, which has the characteristics of being able to be bent at different angles, having good plasticity, and being able to recover its original shape after being heated.

[0041] The shape memory metal plate 4 and the flexible circuit board body 1 are mainly fixed and assembled by fixing blocks 3 and U-shaped blocks 5.

[0042] The fixing block 3 is provided with a locking slot 3a for inserting the ends of the memory metal plate 4. The two ends of the memory metal plate 4 are inserted into the locking slot 3a of the fixing block 3, and then the fixing block 3 is fixedly connected to the flexible circuit board body 1 by bolts, thereby fixing the memory metal plate 4 and providing certain support and protection for the flexible circuit board.

[0043] Furthermore, a U-shaped clip 5 is also assembled between the memory metal plate 4 and the flexible circuit board body 1. The U-shaped clip 5 is a separate detachable part, which realizes the fixation and bonding between the flexible circuit board body and the memory metal plate.

[0044] For the U-shaped card block 5, the size of its groove can be slightly smaller than the sum of the thicknesses of the flexible circuit board body and the memory metal plate, so that the U-shaped card block 5 can be interference-fitted with the memory metal plate 4 and the flexible circuit board body 1.

[0045] like Figure 1-3As shown, multiple fixing stickers 6 are distributed on both sides of the flexible circuit board body 1 to fix the flexible circuit board to the battery cell. One side of the fixing sticker 6 is fixedly bonded to the side of the flexible circuit board body 1, and the bonded fixing sticker 6 extends away from the flexible circuit board body 1. The extension length of the fixing sticker 6 can be freely set to ensure that the fixing sticker 6 can be attached to the battery to fix the flexible circuit board body 1 during installation.

[0046] Using spaced-out fixing stickers to fix the flexible circuit board to the battery cell allows the circuit board to bend in the areas on both sides of the fixing stickers without affecting its movement.

[0047] At the same time, such as Figure 3 As shown, a hollowed-out fold line 8 is provided at the connection between the fixing sticker 6 and the flexible connecting line body 1. The fold line 8 can be used to easily separate the fixing sticker from the flexible circuit board body, avoiding damage to the device caused by tearing the fixing sticker when the circuit board needs to be removed.

[0048] Preferably, a protective film 9 is provided on the fixing sticker 6. After the protective film is removed, the flexible circuit board can be pasted and fixed on the battery cell using the fixing sticker.

[0049] In summary, the flexible circuit board structure with protective function disclosed in this utility model has several advantages. First, the fixed sticker design allows for movement of the electrical contact points on the flexible circuit board. Even if the battery bulges and pushes up the overhead cables, it will not affect the normal electrical connection and pose a risk, thus providing a certain degree of "fault tolerance." Second, the shape memory metal plate (mainly made of nickel-titanium alloy) is fixed to the flexible circuit board using clips. The shape memory metal plate has good plasticity and sufficient strength, allowing it to be bent during installation to adapt to the environment and provide protection for the circuit board. It can also return to its original shape after heating, facilitating reuse. Furthermore, the bonding between the shape memory metal plate and the flexible circuit board enables good thermal conductivity. The thermal conductivity of the shape memory metal plate is superior to the top insulating layer of the flexible connecting wire body, allowing the heat generated by the flexible circuit board to be conducted into the air more quickly.

[0050] The above embodiments are not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model are also within the protection scope of the present utility model.

Claims

1. A flexible circuit board structure with protective function, comprising a flexible circuit board body (1), characterized in that: The flexible circuit board structure also includes: A memory metal plate (4) is laid on the flexible circuit board body (1) and fixedly connected to the flexible circuit board body (1); The fixing sticker (6) has multiple segments, which are distributed on both sides of the flexible circuit board body (1), and a hollowed-out fold line (8) is provided at the connection between the fixing sticker (6) and the flexible circuit board body (1).

2. The flexible circuit board structure with protective function according to claim 1, characterized in that: The flexible circuit board body (1) is provided with PIN pin terminals (2) and aluminum bar connection terminals (7) around its perimeter.

3. The flexible circuit board structure with protective function according to claim 2, characterized in that: The PIN pin terminal (2) is connected to the connector; The aluminum bar connection terminal (7) is ultrasonically welded to the nickel sheet and then electrically connected to the aluminum bar.

4. The flexible circuit board structure with protective function according to claim 1, characterized in that: The two ends of the memory metal plate (4) are inserted into the fixing block (3), and the fixing block (3) is fixedly connected to the flexible circuit board body (1) by bolts.

5. The flexible circuit board structure with protective function according to claim 4, characterized in that: The fixing block (3) is provided with a block groove (3a) for inserting the end of the memory metal plate (4).

6. The flexible circuit board structure with protective function according to claim 1 or 5, characterized in that: A U-shaped card block (5) is also assembled between the memory metal plate (4) and the flexible circuit board body (1).

7. The flexible circuit board structure with protective function according to claim 6, characterized in that: The U-shaped card block (5) is interference-fitted with the memory metal plate (4) and the flexible circuit board body (1).

8. The flexible circuit board structure with protective function according to claim 1, characterized in that: A protective film (9) is provided on the fixing sticker (6).

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