Power battery FPC circuit board

Abstract

The utility model relates to the field of power batteries, and discloses a power battery FPC circuit board, which comprises a first FPC acquisition board and a second FPC acquisition board, the end parts of the first FPC acquisition board and the second FPC acquisition board are connected, the adjacent end parts of the first FPC acquisition board and the second FPC acquisition board are respectively provided with a first welding part and a second welding part, and the first welding part and the second welding part are respectively provided with two groups of connecting units. Each group of connecting units comprises a plurality of welding copper leakage areas which are uniformly arranged in rows, the welding copper leakage areas of the two groups of connecting units are staggered front and back, and each welding copper leakage area of the second welding part is provided with a tin through hole. In practical application, the problems of high production cost and long production period due to the fact that the existing FPC acquisition board cannot adapt to the larger and larger size of the power battery are solved.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, in particular to a power battery FPC circuit board. Background Art

[0002] With the development of electric and intelligent vehicles, the advantages of FPC in bendability, weight reduction, and high degree of automation are further reflected. The use of FPC in the automotive field continues to increase, and its applications cover related scenarios such as headlights, display modules, BMS / VCU / MCU three major power control systems, sensors, and advanced auxiliary systems. The rapid development of new energy vehicles has led to a substantial increase in the demand for FPC for automotive power batteries.

[0003] As people's demand for electric vehicle endurance increases, the overall size of electric vehicle power batteries has gradually increased, and the demand for the length of FPC (flexible circuit board) has also gradually increased. However, the existing production length of a single FPC is generally 1.2-1.5m, which cannot meet the needs of large power batteries. If FPCs of corresponding lengths are produced according to the size of power batteries, existing production technology and equipment cannot be completed, and equipment and technology updates are needed, resulting in a significant increase in the FPC production cycle and cost, which is not conducive to reducing the overall production cost of power batteries and electric vehicles, and greatly affects the market share of electric vehicles.

[0004] In response to the above problems, the applicant has designed an FPC circuit board that can reduce the cost of power batteries. Utility Model Content

[0005] The utility model aims to provide a power battery FPC circuit board to solve the problem of increased FPC production cost as the size of the power battery increases.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a power battery FPC circuit board, comprising a first FPC acquisition board and a second FPC acquisition board connected at the ends, the first FPC acquisition board and the second FPC acquisition board are respectively provided with a first welding part and a second welding part at adjacent ends, the first welding part and the second welding part are each provided with two groups of connection units, each group of the connection units comprises a plurality of welding copper leakage areas evenly arranged in a row, the welding copper leakage areas of the two groups of the connection units are staggered front and back, and each welding copper leakage area of ​​the second welding part is provided with a tin-through hole.

[0007] The principles and advantages of this solution are:

[0008] 1. In actual application, the utility model sets a welding part at the end of two existing lengths of FPC acquisition boards, and two groups of staggered connection units are provided on the welding part, so that the welding copper leakage areas of the welding parts of the two FPC acquisition boards overlap with each other, and then the two FPC acquisition boards are fixed by soldering to achieve the extension of the flexible circuit board, so that the flexible circuit board can adapt to power batteries with a length of more than 2m. At the same time, the process and operation of the utility model are simple, and there is no need to upgrade the production technology and equipment, which effectively reduces the production cost of the flexible circuit board.

[0009] 2. The two groups of welding copper leakage areas of the FPC collection board in the utility model are arranged in a staggered manner front to back, which can greatly reduce or even eliminate the situation of solder overflow between adjacent welding copper leakage areas and cause short tin connection in actual welding; thereby reducing the process of detecting short circuits and cutting off short circuit parts in the production process of flexible circuit boards, saving costs, improving welding efficiency, and eliminating interference caused by short circuits, product scrapping and other problems.

[0010] Furthermore, the center distance between two adjacent welding copper leakage areas in each group is 5-9 mm.

[0011] The setting of the above center distance can not only ensure the welding space and welding gap, but also reduce the overall wiring area, thereby reducing the overall size of the FPC acquisition board and saving material costs.

[0012] Furthermore, the major and minor axis dimensions of the welding copper leakage area are 4.2-4.5 mm*2.8-3.0 mm.

[0013] The above arrangement makes the welding points on the FPC acquisition board smaller in area and more evenly distributed, effectively reducing stress concentration and deformation at the welding parts of the FPC acquisition board and making the welding connection more stable.

[0014] Furthermore, the tin through hole is elliptical, and the length and width of the tin through hole are 1.8-2.2mm*0.8-1.2mm.

[0015] The main purpose of the above settings is to achieve electrical connection between different FPC acquisition boards, component installation and fixation, heat dissipation, structural enhancement and process simplification to ensure the electrical performance, mechanical strength, heat dissipation effect and production efficiency of the FPC acquisition boards.

[0016] Furthermore, the row spacing between two adjacent groups of the connection units is 2.2-2.5 mm.

[0017] The purpose of the above setting is to avoid the solder in the adjacent welding copper leakage area from overflowing after hot melting to form a tin connection defect, resulting in a short circuit in the circuit, and at the same time make the overall structure of the FPC acquisition board more compact.

[0018] Furthermore, a hard reinforcing plate is provided at the bottom of the second welding portion.

[0019] The above arrangement increases the mechanical strength of the connection between the two FPC boards through the hard reinforcing plate, and on the other hand, keeps the two FPC boards flat during welding, and further avoids solder joint breakage or fatigue failure of the FPC boards.

[0020] Furthermore, a polyimide film is provided on the surface of the first welding portion after welding with the second FPC welding portion.

[0021] The above-mentioned PI film can provide mechanical protection, insulation protection and environmental protection for the welding structure of the two acquisition boards, effectively improving the overall performance and reliability of the FPC acquisition board. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the explosion structure of an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the integrated structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The reference numerals in the drawings of the specification include: a first FPC acquisition board 1, a first welding portion 2, a second FPC acquisition board 3, a second welding portion 4, a welding copper leakage area 5, and a tin-through hole 6.

[0026] Example

[0027] A power battery FPC circuit board, such as Figure 1 , Figure 2As shown, it includes a first FPC acquisition board 1 and a second FPC acquisition board 3 connected at the ends, and the adjacent ends of the first FPC acquisition board 1 and the second FPC acquisition board 3 are respectively provided with a first welding portion 2 and a second welding portion 4, and the first welding portion 2 and the second welding portion 4 are provided with two groups of connection units, each group of connection units includes a plurality of welding copper leakage areas 5 uniformly arranged along the width direction of the FPC acquisition board, and the two groups of welding copper leakage areas 5 are staggered with each other, and the connection units of the first welding portion 2 and the second welding portion 4 are symmetrically distributed, and the connection units of the two completely overlap during welding; the row spacing between the two adjacent groups of connection units is 2.4mm, and the adjacent welding copper leakage areas in each group The center distance of 5 is 6mm, so as to avoid the overflow of solder between adjacent welding copper leakage areas 5 and cause a short tin connection; the length and width of each welding copper leakage area 5 are 4.3mm*2.8mm, so that the welding point area is small and evenly distributed, effectively reducing the stress concentration and deformation of the welding part of the FPC acquisition board; each welding copper leakage area 5 of the second welding part 4 is provided with a tin through hole 6, and the tin through hole 6 is elliptical, and its long and short axis dimensions are 2.0mm*1.0mm, so as to ensure that the solder can fully fill the tin through hole, form a good electrical and mechanical connection, and ensure that the components can be accurately and firmly installed on the FPC acquisition board.

[0028] Furthermore, in order to ensure the mechanical strength of the FPC acquisition board, a hard reinforcement plate (not shown in the figure) is provided at the bottom of the second welding portion 4, so that the two FPC acquisition boards remain flat during welding, while also avoiding solder joint breakage or FPC acquisition board fatigue failure.

[0029] Furthermore, after the first welding part 2 and the second welding part 4 are welded, a layer of polyimide film is pasted on the surface of the first welding part 2. The polyimide film can provide mechanical protection, insulation protection and environmental protection for the welding structure of the two acquisition boards, effectively improving the overall performance and reliability of the FPC acquisition board.

[0030] The specific implementation process is as follows:

[0031] In specific application, the first FPC acquisition board is placed above the second FPC acquisition board 3, and the welding copper leakage areas 5 on the first welding part 2 and the second welding part 4 are aligned with each other to achieve welding positioning between the first FPC acquisition board and the second FPC acquisition board, and then a hard reinforcement plate is installed and fixed under the second welding part 4 to ensure that the FPC acquisition board will not bend, curl and deform during the welding process; during welding, the solder passes through the welding copper leakage areas 5 on the first welding part 2 and the second welding part 4 in turn and welds the first FPC acquisition board 1 and the second FPC acquisition board 3 into a whole through the tin through hole 6 to connect the circuit, and then a layer of polyimide film is pasted on the first welding part 2 after welding as a protective film, and the first FPC acquisition board 1 and the second FPC acquisition board 3 are welded and extended.

[0032] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A power battery FPC circuit board, characterized in that: It includes a first FPC acquisition board and a second FPC acquisition board connected at the ends, the first FPC acquisition board and the second FPC acquisition board are respectively provided with a first welding part and a second welding part at adjacent ends, the first welding part and the second welding part are each provided with two groups of connection units, each group of the connection units includes a plurality of welding copper leakage areas evenly arranged in a row, the welding copper leakage areas of the two groups of the connection units are staggered front and back, and each welding copper leakage area of ​​the second welding part is provided with a tin-through hole.

2. A power battery FPC circuit board according to claim 1, characterized in that: The center distance between two adjacent welding copper leakage areas in each group is 5-9 mm.

3. A power battery FPC circuit board according to claim 2, characterized in that: The length and width of the welding copper leakage area are 4.2-4.5mm*2.8-3.0mm.

4. A power battery FPC circuit board according to claim 3, characterized in that: The tin-through hole is elliptical, and the major and minor axis dimensions of the tin-through hole are 1.8-2.2 mm*0.8-1.2 mm.

5. A power battery FPC circuit board according to claim 4, characterized in that: The row spacing between two adjacent groups of the connection units is 2.2-2.5 mm.

6. A power battery FPC circuit board according to claim 5, characterized in that: A hard reinforcing plate is provided at the bottom of the second welding portion.

7. A power battery FPC circuit board according to claim 6, characterized in that: After the first welding part and the second FPC welding part are welded, a polyimide film is provided on the surface.

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