Flexible circuit board assembly capable of reducing space ratio and battery module

Abstract

A flexible circuit board assembly capable of reducing the space ratio comprises a flexible circuit board, a connector, a buffer sheet and a conductive sheet, the flexible circuit board is of a single-sided board structure, the connector is electrically connected to the flexible circuit board, one end of the buffer sheet is electrically connected to the flexible circuit board, the other end of the buffer sheet is provided with a bonding pad, and the conductive sheet is electrically connected to the flexible circuit board. One end of the conducting strip is welded to the bonding pad; in a normal state, the bonding pad is located on the outer side of the flexible circuit board, and the other end of the conducting strip extends towards one side of the flexible circuit board. And when the conducting plate is connected to a bus aluminum bar of the battery module, the buffer plate is bent to be fixed on the back surface of the flexible circuit board, and the other end of the conducting plate extends out of the outer side of the flexible circuit board. The utility model also provides a battery module using the flexible circuit board assembly. Compared with the prior art, the space occupation ratio of the flexible circuit board assembly is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible circuit boards, and particularly relates to a flexible circuit board assembly capable of reducing space occupation and a battery module using the flexible circuit board assembly. Background Art

[0002] To accurately monitor and manage battery status, improve battery performance, ensure safety, and extend battery life, battery modules are equipped with flexible circuit board assemblies. However, the space available for the integrated busbars in some existing automotive batteries is limited. Single-sided circuitry eliminates the need for nickel pads, while double-sided circuitry increases costs. Utility Model Content

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a flexible circuit board assembly that can reduce space occupation.

[0004] To achieve the above objectives, the present invention discloses a flexible circuit board assembly capable of reducing space occupation, comprising a flexible circuit board, a connector, a buffer sheet, and a conductive sheet. The flexible circuit board is a single-sided board structure, the connector is electrically connected to the flexible circuit board, one end of the buffer sheet is electrically connected to the flexible circuit board, and the other end is provided with a soldering pad, and one end of the conductive sheet is soldered to the soldering pad;

[0005] Under normal conditions, the pad is located outside the flexible circuit board, and the other end of the conductive sheet extends toward one side of the flexible circuit board;

[0006] When the conductive sheet is connected to the aluminum busbar of the battery module, the buffer sheet is bent to be fixed on the back side of the flexible circuit board, and the other end of the conductive sheet extends out of the outside of the flexible circuit board.

[0007] Preferably, in the width direction of the flexible circuit board, the length of the buffer sheet does not exceed the length of the flexible circuit board.

[0008] Preferably, the front surface of the buffer sheet is connected to the conductive sheet, and the back surface of the buffer sheet is connected to the back surface of the flexible circuit board.

[0009] Preferably, a double-sided adhesive member is provided between the flexible circuit board and the buffer sheet, and the double-sided adhesive member has two adhesive surfaces for respectively bonding and fixing the flexible circuit board and the buffer sheet.

[0010] Preferably, the double-sided adhesive is fixed to the back side of the flexible circuit board.

[0011] Preferably, the double-sided adhesive member is made of elastic material.

[0012] Preferably, the conductive sheet includes a first connecting sheet, a avoidance sheet and a second connecting sheet connected in sequence, the first connecting sheet is electrically connected to the flexible circuit board, the bottom of the avoidance sheet is higher than the bottom of the second connecting sheet, and the second connecting sheet is arranged next to the avoidance sheet.

[0013] The utility model also provides a battery module using the flexible circuit board assembly.

[0014] A battery module adopts the flexible circuit board assembly as described above which can reduce space occupation.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The buffer sheet is specifically configured so that the pads are normally located on the outside of the flexible circuit board. When connected to the battery module, the buffer sheet is bent and fixed to the back of the flexible circuit board. In this way, after the flexible circuit board assembly is fixed to the battery module, the single-sided flexible circuit board has a designed area for pads. Because the pads are located on the back of the flexible circuit board (i.e., the back of the single-sided flexible circuit board with circuits), the expanded area of ​​the flexible circuit board is small, which can reduce its space usage and enable the flexible circuit board assembly to be installed in a relatively small space. Compared with double-sided flexible circuit board structures, single-sided flexible circuit board assemblies can reduce costs.

[0017] The conductive sheet is arranged so that the other end of the conductive sheet extends toward one side of the flexible circuit board under normal conditions, and the other end of the conductive sheet extends out of the outside of the flexible circuit board when connected to the battery module. This can avoid damage to the flexible circuit board during the connection between the conductive sheet and the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the flexible circuit board assembly in the unfolded state that can reduce space occupation in Example 1;

[0019] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the flexible circuit board assembly in the folded state;

[0020] Figure 3 for Figure 2 The main view of the flexible circuit board assembly in the folded state;

[0021] Figure 4 Schematic diagram of the three-dimensional structure of another conductive sheet in Example 1;

[0022] Flexible circuit board 1;

[0023] Connector 2;

[0024] Buffer sheet 3; pad 31;

[0025] Conductive sheet 4; first connecting sheet 41; avoidance sheet 42; second connecting sheet 43;

[0026] Double-sided adhesive 5. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] Example 1

[0029] A flexible circuit board assembly that can reduce space usage, see Figure 1-Figure 2 , including a flexible circuit board 1, a connector 2, a buffer sheet 3 and a conductive sheet 4. The flexible circuit board 1 is a single-sided board structure. The connector 2 is electrically connected to the flexible circuit board 1. One end of the buffer sheet 3 is electrically connected to the flexible circuit board 1, and the other end is provided with a soldering pad 31. One end of the conductive sheet 4 is soldered to the soldering pad 31. The flexible circuit board 1 and the buffer sheet 3 both have a certain degree of elasticity and can unfold on their own under normal conditions. Under normal conditions, the soldering pad 31 is located on the outside of the flexible circuit board 1, and the other end of the conductive sheet 4 extends toward the side of the flexible circuit board 1. When the conductive sheet 4 is connected to the aluminum bus bar of the battery module (this process can be achieved by folding), the buffer sheet 3 is bent to be fixed to the back of the flexible circuit board 1, and the other end of the conductive sheet 4 extends out of the outside of the flexible circuit board 1.

[0030] The buffer sheet 3 is specifically configured as follows: under normal conditions, the solder pad 31 is located on the outside of the flexible circuit board 1. When connected to the battery module, the buffer sheet 3 is bent and fixed to the back of the flexible circuit board 1. In this way, after the flexible circuit board assembly is fixed to the battery module, the single-sided flexible circuit board 1 has a design area for the solder pad 31. Because the solder pad 31 is located on the back of the flexible circuit board 1 (that is, the back of the single-sided flexible circuit board 1 with circuits), the unfolded area of ​​the flexible circuit board 1 is small, which can reduce its space occupancy and enable the flexible circuit board assembly to be installed in a relatively small space. Compared with the double-sided flexible circuit board 1 structure, the single-sided flexible circuit board assembly can reduce costs. The conductive sheet 4 is configured so that under normal conditions, the other end of the conductive sheet 4 extends toward one side of the flexible circuit board 1. When connected to the battery module, the other end of the conductive sheet 4 extends outside the flexible circuit board 1. This can prevent the conductive sheet 4 from damaging the flexible circuit board 1 during the connection process with the battery module.

[0031] In this embodiment, the length of the buffer sheet 3 does not exceed the length of the flexible circuit board 1 in the width direction of the flexible circuit board 1. In this way, when the buffer sheet 3 is connected to the flexible circuit board 1, it will not extend out of the flexible circuit board 1, which is beneficial to ensure that the flexible circuit board 1 does not occupy a large space and reduce the space occupied.

[0032] In this embodiment, the front side of the buffer sheet 3 is connected to the conductive sheet 4, and the back side of the buffer sheet 3 is connected to the back side of the flexible circuit board 1. The front and back sides of the buffer sheet 3 are both flat surfaces, and they are connected on two surfaces respectively. This can improve the connection reliability between the buffer sheet 3 and the conductive sheet 4 and the flexible circuit board 1, and avoid the situation where both are connected on the same side, resulting in a decrease in their connection reliability.

[0033] In this embodiment, a double-sided adhesive member 5 is provided between the flexible circuit board 1 and the buffer sheet 3. The double-sided adhesive member 5 has two adhesive surfaces, which respectively bond and fix the flexible circuit board 1 and the buffer sheet 3. This can enable the buffer sheet 3 to maintain the folding effect and its connection effect with the battery module, thereby improving the connection reliability.

[0034] The double-sided adhesive member 5 is fixed to the back of the flexible circuit board 1 , so that the double-sided adhesive members 5 corresponding to the plurality of buffer sheets 3 can be first bonded to the back of the flexible circuit board 1 , which is more convenient than bonding them to other places.

[0035] The double-sided adhesive member 5 is made of elastic material.

[0036] In this embodiment, the conductive sheet 4 includes a first connecting sheet 41, a relief sheet 42, and a second connecting sheet 43, which are connected in sequence. The first connecting sheet 41 is electrically connected to the flexible circuit board 1. The bottom of the relief sheet 42 is higher than the bottom of the second connecting sheet 43. The second connecting sheet 43 is located to the side of the relief sheet 42. Therefore, when the flexible circuit board assembly becomes damaged and needs to be replaced, the relief sheet 42 can be positioned above the original soldering position. The flexible circuit board assembly is connected to the battery module's cells via the second connecting sheet 43. This eliminates the need to polish the original soldering position, facilitating replacement of the new flexible circuit board assembly and improving replacement efficiency. Because the bottom of the relief sheet 42 is higher than the bottom of the second connecting sheet 43, the relief sheet 42 is positioned higher relative to the second connecting sheet 43. When above the original soldering position, the relief sheet 42 is not, or substantially not, lifted by the original soldering position, thereby affecting the connection of the second connecting sheet 43. This improves the connection reliability of the second connecting sheet 43. The second connecting sheet 43 is positioned relatively lower, allowing it to contact the battery module's cells, further improving connection reliability.

[0037] Example 2

[0038] A battery module adopts the flexible circuit board assembly of embodiment 1 that can reduce space occupation.

[0039] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A flexible circuit board assembly capable of reducing space occupation, characterized by: The flexible circuit board comprises a connector, a buffer sheet and a conductive sheet. The flexible circuit board is a single-sided board structure. The connector is electrically connected to the flexible circuit board. One end of the buffer sheet is electrically connected to the flexible circuit board, and the other end is provided with a pad. One end of the conductive sheet is welded to the pad. Under normal conditions, the pad is located outside the flexible circuit board, and the other end of the conductive sheet extends toward one side of the flexible circuit board; When the conductive sheet is connected to the aluminum busbar of the battery module, the buffer sheet is bent to be fixed on the back side of the flexible circuit board, and the other end of the conductive sheet extends out of the outside of the flexible circuit board.

2. The flexible circuit board assembly capable of reducing space occupation according to claim 1, characterized in that: In the width direction of the flexible circuit board, the length of the buffer sheet does not exceed the length of the flexible circuit board.

3. The flexible circuit board assembly capable of reducing space occupation according to claim 1, characterized in that: The front surface of the buffer sheet is connected to the conductive sheet, and the back surface of the buffer sheet is connected to the back surface of the flexible circuit board.

4. The flexible circuit board assembly capable of reducing space occupation according to any one of claims 1 to 3, characterized in that: A double-sided adhesive member is provided between the flexible circuit board and the buffer sheet. The double-sided adhesive member has two adhesive surfaces for respectively bonding and fixing the flexible circuit board and the buffer sheet.

5. The flexible circuit board assembly capable of reducing space occupation according to claim 4, characterized in that: The double-sided adhesive member is fixed to the back side of the flexible circuit board.

6. The flexible circuit board assembly capable of reducing space occupation according to claim 4, characterized in that: The material of the double-sided adhesive piece is elastic material.

7. The flexible circuit board assembly capable of reducing space occupation according to any one of claims 1 to 3, characterized in that: The conductive sheet includes a first connecting sheet, a avoiding sheet and a second connecting sheet connected in sequence, the first connecting sheet is electrically connected to the flexible circuit board, the bottom of the avoiding sheet is higher than the bottom of the second connecting sheet, and the second connecting sheet is arranged beside the avoiding sheet.

8. A battery module, characterized in that: A flexible circuit board assembly capable of reducing space occupation as claimed in claim 1 is used.

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