CN220382333U - Concave-convex FPC-aluminum bar connection structure based on transition connection sheet - Google Patents
Concave-convex FPC-aluminum bar connection structure based on transition connection sheet Download PDFInfo
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- CN220382333U CN220382333U CN202321784694.3U CN202321784694U CN220382333U CN 220382333 U CN220382333 U CN 220382333U CN 202321784694 U CN202321784694 U CN 202321784694U CN 220382333 U CN220382333 U CN 220382333U
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- fpc
- aluminum bar
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- convex
- concave
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 80
- 230000007704 transition Effects 0.000 title claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000003466 welding Methods 0.000 claims abstract description 30
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 230000004927 fusion Effects 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 8
- 238000010168 coupling process Methods 0.000 claims 8
- 238000005859 coupling reaction Methods 0.000 claims 8
- 238000000034 method Methods 0.000 description 6
- 238000005476 soldering Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 210000002489 tectorial membrane Anatomy 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Abstract
The utility model relates to a concave-convex FPC-aluminum bar connection structure based on a transition connection sheet, wherein the FPC comprises a conductive layer and two insulating covering layers covered on two surfaces of the conductive layer, and the FPC-aluminum bar connection structure comprises: the connecting arm comprises a conductive part which is integrally formed with the conductive layer and extends to the outer side of the FPC, and two cover parts which are respectively formed by extending two cover layers to the conductive part, wherein the two cover parts are respectively covered on two surfaces of the conductive part, and windows for partially exposing the conductive part are correspondingly formed in the middle parts of the two cover parts; the protruding part is formed on one surface of the connecting sheet or the aluminum bar, which is opposite to the connecting arm, and is opposite to the window, the protruding height of the protruding part is larger than the sum of the thicknesses of the two covering parts, and the protruding range of the protruding part is within the surrounding range of the window; and the welding surface for laser driving to fuse and weld the connecting sheet, the connecting arm and the aluminum bar is formed on one surface of the connecting sheet, which is opposite to the connecting arm. The structure can enable the connecting sheet, the FPC and the aluminum bar to be tightly attached, and the welding reliability is guaranteed.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a concave-convex FPC-aluminum bar connection structure based on a transition connection sheet.
Background
In CCS (integrated busbar, abbreviated as Cells Contact System) harness isolation plates of battery modules, an FPC (flexible circuit board, abbreviated as Flexible Printed Circuit) is connected to an aluminum bar by welding a connection sheet (usually a nickel sheet) on the FPC in advance, and then welding the other end of the connection sheet to the aluminum bar. However, in this connection method, the solder between the connection pad and the FPC needs to be reflow soldered, which is complicated and costly.
In order to solve the above problems, an improved FPC-aluminum bar connection method is provided, and a connection piece is still needed, but the connection piece is directly covered on one side surface of the FPC connection end, aluminum bar is covered on the other side surface of the FPC connection end, and then the connection piece, the FPC connection end and the aluminum bar are welded in a fusion manner by means of welding. The improved connection mode eliminates the reflow soldering process of the connecting sheet and the FPC, simplifies the process and reduces the cost. For the fusion welding mode of the three, considering that the connecting sheet is in direct contact with the lead of the FPC connecting end, if the fusion welding of the three is carried out in an ultrasonic welding mode, the lead is easily worn by the connecting sheet due to ultrasonic vibration, and then the broken wire is caused, so that the improved connecting mode generally adopts laser welding to carry out the fusion welding of the three.
However, the reliability of laser welding depends on whether the welded objects are in close contact or not, if the welded objects are not in close contact, the virtual welding is easy to cause, and in order to ensure that the connecting sheet can be in close contact with the lead of the FPC connecting end, an SMT (surface mount technology) is generally adopted to cover the connecting sheet on the lead layer of the FPC connecting end by using a coating, but the SMT is complex in technology, the installation of the nickel sheet is required to be completed during the preparation of the FPC, and the flexibility is poor.
Disclosure of Invention
In order to solve the problems, the utility model provides the concave-convex type FPC-aluminum bar connecting structure based on the transition connecting sheet, and the connecting sheet, the FPC and the aluminum bar can be tightly attached through the concave-convex structure, so that the reliability of laser welding is ensured.
The utility model is realized by the following scheme: concave-convex type FPC-aluminum bar connection structure based on transition connection piece, FPC includes conducting layer and covers respectively in two insulating overburden of two surfaces of conducting layer, FPC-aluminum bar connection structure includes:
the connecting arm comprises a conductive part which is integrally formed with the conductive layer and extends to the outer side of the FPC, and two cover parts which are respectively formed by extending the two cover layers to the conductive part, wherein the two cover parts are respectively covered on the two surfaces of the conductive part, and windows for partially exposing the conductive part are correspondingly formed in the middle parts of the two cover parts;
the protruding part is formed on one surface of the connecting sheet or the aluminum bar, which is opposite to the connecting arm, and is opposite to the window, the protruding height of the protruding part is larger than the sum of the thicknesses of the two covering parts, and the protruding range of the protruding part is within the surrounding range of the window;
and a welding surface for laser driving to weld the connecting sheet, the connecting arm and the aluminum bar in a fusion way is formed on one surface of the connecting sheet, which is opposite to the connecting arm.
The concave-convex type FPC-aluminum bar connection structure based on the transition connection sheet is further improved in that the protruding height of the protruding portion is 0.05-0.15 mm larger than the sum of the thicknesses of the two covering portions.
The concave-convex type FPC-aluminum bar connecting structure based on the transition connecting sheet is further improved in that a concave pit is formed in the middle of the connecting sheet, the back surface of the concave pit is formed in the protruding portion, and the front surface of the concave pit is formed in the welding surface.
The concave-convex FPC-aluminum bar connecting structure based on the transitional connecting sheet is further improved in that a circle of edges which are inscribed in the concave pits and used for blocking the periphery of the window are formed on the periphery of the connecting sheet.
The concave-convex FPC-aluminum bar connection structure based on the transition connection sheet is further improved in that the pit wall of the pit is inclined inwards from the opening to the pit bottom, and the pit bottom of the pit is flat bottom.
The concave-convex FPC-aluminum bar connection structure based on the transition connection sheet is further improved in that the protruding portion is a boss integrally formed on the surface of the aluminum bar.
The concave-convex FPC-aluminum bar connecting structure based on the transition connecting sheet is further improved in that the peripheral wall of the boss is inclined inwards relatively from the position close to the surface of the aluminum bar to the position far away from the surface of the aluminum bar, and the top end of the boss is flat-topped.
The concave-convex type FPC-aluminum bar connection structure based on the transition connection sheet is further improved in that the covering part comprises a PI film and a colloid used for bonding the PI film to the conductive part.
The concave-convex FPC-aluminum bar connection structure based on the transition connection sheet is further improved in that the connection sheet is a nickel sheet or an aluminum sheet.
The concave-convex FPC-aluminum bar connection structure based on the transition connecting sheet is further improved in that the conductive part is aluminum-based or copper-based.
The utility model includes, but is not limited to, the following benefits:
1. the connecting piece is still utilized for transitional connection, but SMT and reflow soldering processes between the connecting piece and the FPC are eliminated, the connection between the FPC and the aluminum bar is realized by directly covering the connecting piece and matching with the direct soldering, the process is simplified, and the cost is reduced.
2. The connecting sheet, the FPC and the aluminum bar are welded in a fusion mode by adopting a laser welding mode, so that the problems of abrasion and even wire breakage of a lead caused by vibration during ultrasonic welding are avoided.
3. Through the effect that the tectorial membrane played the reinforcement around the welded area, utilize concave-convex structure to absorb the thickness of tectorial membrane simultaneously for can closely laminate between connection piece, FPC and the aluminium bar, guaranteed laser welding's reliability.
Drawings
Fig. 1 shows a schematic diagram of an exploded state of a first embodiment of the present utility model.
Fig. 2 shows a schematic cross-sectional view of the first embodiment of the present utility model in an installed state.
Fig. 3 shows a schematic diagram of an exploded state of a second embodiment of the present utility model.
Fig. 4 shows a schematic cross-sectional view of an installed state of a second embodiment of the present utility model.
Detailed Description
In order to solve the problem that the traditional FPC-aluminum bar connecting structure which is directly welded by covering the connecting sheet is provided with the connecting sheet, the FPC and the aluminum bar cannot be tightly attached, and therefore the cold joint is caused. The utility model provides a concave-convex type FPC-aluminum bar connecting structure based on a transition connecting sheet, which enables the connecting sheet, the FPC and the aluminum bar to be tightly attached through a concave-convex structural form, and ensures the reliability of laser welding. The concave-convex type FPC-aluminum bar connection structure based on the transition connection sheet is further described below by using a specific embodiment with reference to the attached drawings.
Referring to fig. 1 to 4, a concave-convex type FPC-aluminum bar connection structure based on a transition connection sheet, the FPC includes a conductive layer and two insulating cover layers respectively covering two surfaces of the conductive layer, the FPC-aluminum bar connection structure includes: a connecting arm 1, wherein the connecting arm 1 comprises a conductive part 11 integrally formed with the conductive layer and extending to the outside of the FPC, and two cover parts (comprising an upper cover part 12 and a lower cover part 13) respectively formed by extending two cover layers to the conductive part 11, the upper cover part 12 and the lower cover part 13 respectively cover the upper surface and the lower surface of the conductive part 11, and windows 4 for partially exposing the conductive part 11 are correspondingly arranged in the middle parts of the upper cover part 12 and the lower cover part 13; a protruding part formed on one surface of the connecting piece 3 or the aluminum bar 2 opposite to the connecting arm 1 and opposite to the window 4, wherein the protruding height of the protruding part is larger than the sum of the thicknesses of the upper covering part 12 and the lower covering part 13, and the protruding range of the protruding part is within the surrounding range of the window 4; and a welding surface for laser driving to weld the connecting sheet 3, the connecting arm 1 and the aluminum bar 2 in a fusion way is formed on the surface of the connecting sheet opposite to the connecting arm 1.
Specifically: the connecting piece 3 is a separate component, and does not need to be integrally supplied with the FPC, however, the conductive part 11, the upper cover part 12 and the lower cover part 13 need to be integrally supplied with the FPC and prepared together, and cover films are reserved around the upper cover part 12 and the lower cover part 13, so that on one hand, conductive lines of the FPC are packaged to resist the tensile force after being welded with the aluminum bar 2, and on the other hand, the manufacturing process of the FPC is facilitated. The upper cover part 12 and the lower cover part 13 are integrally formed with two insulating cover layers of the FPC, respectively, each including a PI film and a glue for bonding the PI film to the conductive part 11. The film is firmer through colloid. The connecting piece 3 can be a nickel sheet or an aluminum sheet, and the nickel sheet is more commonly used. The conductive portion 11 is integrally formed with the conductive layer of the FPC, and may be made of aluminum or copper, and the aluminum base is made of the same material as the aluminum bar 2, so that there is no electrochemical reaction in the welding between the two. For copper base, the nickel plating layer is applied to the surface of the conductive portion 11 facing the aluminum bar 2, and preferably, the gold plating treatment is further performed to prevent the electrochemical reaction generated during the welding between different materials.
Regarding the structure of the boss, two embodiments are provided:
in embodiment 1, as shown in fig. 1 and 2, a boss is formed on a connecting piece 3. As shown in fig. 1 and 2, a recess 31 is formed in the middle of the connecting piece 3 (directly mound on the connecting piece), the back of the recess 31 is formed as the protruding portion, and the front of the recess 31 is formed as the welding surface. When the connecting structure is installed, the connecting arm 1 is firstly erected on the surface of the aluminum bar 2, the aluminum bar 2 is covered on the lower side window, then the connecting piece 3 is positioned at the upper side window of the connecting arm 1, the concave pit 31 is embedded into the upper side window, the connecting piece 3 is pressed downwards to press the conductive part 11, the conductive part 11 is bent towards the lower side window 4 until the back surface (namely the convex part) of the concave pit 31 is flush with the lower covering part 13, at the moment, the back surface of the concave pit 31 is directly contacted with the upper surface of the conductive part 11, the lower surface of the conductive part 11 is directly contacted with the aluminum bar 2, and the three parts are in a close fit state. And then the connecting sheet 3, the conducting plate 11 and the aluminum bar 2 are fused and welded by laser on the welding surface. In the present embodiment, the total thickness of the concave portion 31 of the connecting piece 3 (i.e. the protruding height of the protruding portion) is slightly larger than the sum of the thicknesses of the upper cover portion 12 and the lower cover portion 13, and the thickness exceeding the sum is preferably in the range of 0.05mm to 0.15mm, for example, for the PI film plus colloid form of the cover portion, the thickness of each cover portion is about 0.05mm, and the sum of the thicknesses of the upper cover portion 12 and the lower cover portion 13 is about 0.1mm, and the protruding height of the protruding portion is about 0.15mm to 0.25mm, preferably about 0.2mm. In this embodiment, the concave pit 31 of the connecting piece 3 absorbs the thickness of the upper cover part 12 and the lower cover part 13, so that the three parts can be closely attached, thereby avoiding cold joint and ensuring reliable welding of the three parts.
Preferably, a rim 32 is formed around the connecting piece 3, which is inscribed in the recess 31 and is used for blocking around the window 4. By the arrangement of the edge 32, the window is effectively blocked, so that welding is tighter, and gaps are avoided.
More preferably, the walls of the pit 31 are inclined relatively inward from the opening to the pit bottom, and the pit bottom of the pit 31 is a flat bottom. By the inclined pit wall arrangement, the pit 31 can be aligned with the window and embedded into the window more conveniently, in addition, by the limitation of the flat bottom, the plane contact between the connecting sheet 3 and the conductive part 11 is ensured, and the abrasion to the conductive part 11 is avoided.
In embodiment 2, as shown in fig. 3 and 4, the boss is a boss 21 integrally formed on the surface of the aluminum bar 2. The boss 21 may be formed by upsetting the periphery of the connection region of the aluminium bar 2. When the connection structure is installed: firstly, correspondingly placing the aluminum bar 2 below the connecting arm 1, and enabling the boss 21 to face the lower side window; then the connecting arm 1 is lowered and erected on the aluminum bar 2, so that the boss 21 is inserted into the lower side window; the connecting sheet 3 is correspondingly covered at the upper window, and the welding surface is upwards; then, the connecting piece 3 is pressed downwards and the connecting arm 1 is driven downwards, so that the boss 21 presses the conductive part 11, the conductive part 11 is bent towards the upper window 4, and the upper surface of the conductive part 11 is contacted with the lower surface of the connecting piece 3. At this time, the lower surface of the connecting piece 3 is directly contacted with the upper surface of the conductive part 11, and the top end of the boss 21 is directly contacted with the lower surface of the conductive part 11, and the three are in a close fit state. And then the connecting sheet 3, the conducting plate 11 and the aluminum bar 2 are fused and welded by laser on the welding surface. In this embodiment, the height of the protruding thinned portion of the boss 21 (i.e., the protruding height of the protruding portion) is slightly greater than the sum of the thicknesses of the upper and lower covering portions 12 and 13, and is preferably in the range of 0.05mm to 0.15mm, for example, for the PI film plus colloid type covering portions, each covering portion has a thickness of about 0.05mm, the sum of the thicknesses of the upper and lower covering portions 12 and 13 is about 0.1mm, and the protruding height of the protruding portion is about 0.15mm to 0.25mm, preferably about 0.2mm. In this embodiment, the thickness of the upper cover 12 and the lower cover 13 is absorbed by the boss 21 of the aluminum bar 2, so that the three parts can be closely attached, thereby avoiding cold joint and ensuring reliable welding of the three parts.
Preferably, the peripheral wall of the boss 21 is inclined relatively inwards from the surface close to the aluminum bar 2 to the surface far from the aluminum bar 2, and the top end of the boss 21 is flat-topped. Through the above-mentioned slope setting for can be more convenient aim at the window with boss 21 and insert the window, in addition, through the restriction of flat top, guaranteed the plane contact of boss 21 and conductive part 11, avoided the wearing and tearing to conductive part 11.
The present utility model has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the utility model based on the above description. Accordingly, certain details of the illustrated embodiments are not to be taken as limiting the utility model, which is defined by the appended claims.
Claims (10)
1. Concave-convex type FPC-aluminum bar connection structure based on transition connection piece, FPC includes conducting layer and covers respectively in two insulating overburden of conducting layer's two surfaces, its characterized in that, FPC-aluminum bar connection structure includes:
the connecting arm comprises a conductive part which is integrally formed with the conductive layer and extends to the outer side of the FPC, and two cover parts which are respectively formed by extending the two cover layers to the conductive part, wherein the two cover parts are respectively covered on the two surfaces of the conductive part, and windows for partially exposing the conductive part are correspondingly formed in the middle parts of the two cover parts;
the protruding part is formed on one surface of the connecting sheet or the aluminum bar, which is opposite to the connecting arm, and is opposite to the window, the protruding height of the protruding part is larger than the sum of the thicknesses of the two covering parts, and the protruding range of the protruding part is within the surrounding range of the window;
and a welding surface for laser driving to weld the connecting sheet, the connecting arm and the aluminum bar in a fusion way is formed on one surface of the connecting sheet, which is opposite to the connecting arm.
2. The transition piece-based concave-convex FPC-aluminum bar connection structure according to claim 1, wherein the protrusion height of the protrusion is greater than the sum of the thicknesses of the two cover portions by 0.05mm to 0.15mm.
3. The transition piece-based concave-convex FPC-aluminum bar connection structure according to claim 1, wherein a dimple is formed in a middle portion of the connection piece, a back surface of the dimple is formed to the convex portion, and a front surface of the dimple is formed to the welding surface.
4. A transitional coupling tab-based FPC-aluminum bar coupling as claimed in claim 3, wherein the coupling tab has a rim formed around the coupling tab for engaging the recess and for blocking around the window.
5. A transitional coupling tab-based male FPC-aluminum bar coupling as claimed in claim 3, wherein the walls of the wells are inclined relatively inwardly from the opening to the bottom of the wells, and the bottom of the wells is flat.
6. The transitional coupling sheet-based concave-convex type FPC-aluminum bar coupling structure according to claim 1, wherein the convex portion is a boss integrally formed on the surface of the aluminum bar.
7. The transition piece-based concave-convex FPC-aluminum bar connection structure according to claim 6, wherein the peripheral wall of the boss is inclined relatively inward from near to far from the aluminum bar surface, and the top end of the boss is flat-topped.
8. The transition piece-based concave-convex FPC-aluminum bar connection structure according to claim 1, wherein the cover portion includes a PI film and a colloid for bonding the PI film to the conductive portion.
9. The transition-connection-sheet-based concave-convex type FPC-aluminum bar connection structure according to claim 1, wherein the connection sheet is a nickel sheet or an aluminum sheet.
10. The transition piece-based concave-convex FPC-aluminum bar connection structure according to claim 1, wherein the conductive portion is aluminum-based or copper-based.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321784694.3U CN220382333U (en) | 2023-07-07 | 2023-07-07 | Concave-convex FPC-aluminum bar connection structure based on transition connection sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321784694.3U CN220382333U (en) | 2023-07-07 | 2023-07-07 | Concave-convex FPC-aluminum bar connection structure based on transition connection sheet |
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| Publication Number | Publication Date |
|---|---|
| CN220382333U true CN220382333U (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321784694.3U Active CN220382333U (en) | 2023-07-07 | 2023-07-07 | Concave-convex FPC-aluminum bar connection structure based on transition connection sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220382333U (en) |
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2023
- 2023-07-07 CN CN202321784694.3U patent/CN220382333U/en active Active
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