CN113871740A - Aluminum bar connecting piece with novel voltage sampling points and preparation method thereof - Google Patents

Aluminum bar connecting piece with novel voltage sampling points and preparation method thereof Download PDF

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Publication number
CN113871740A
CN113871740A CN202111058904.6A CN202111058904A CN113871740A CN 113871740 A CN113871740 A CN 113871740A CN 202111058904 A CN202111058904 A CN 202111058904A CN 113871740 A CN113871740 A CN 113871740A
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aluminum
voltage sampling
sheet
connecting piece
welding
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CN202111058904.6A
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Chinese (zh)
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谢仁锋
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Dongguan Wanlian Industry Co ltd
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Dongguan Wanlian Industry Co ltd
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Priority to CN202111058904.6A priority Critical patent/CN113871740A/en
Publication of CN113871740A publication Critical patent/CN113871740A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/502Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/502Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/519Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laser Beam Processing (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses an aluminum bar connecting piece with a novel voltage sampling point and a preparation method thereof. The first voltage sampling point connector can be detachably connected with the second voltage sampling point connector on the voltage sampling flexible circuit board, so that the aluminum bar connecting piece and the voltage sampling flexible circuit board can be conveniently installed and detached, when a battery needs to be replaced, the battery does not need to be replaced together with the voltage sampling flexible circuit board, the cost is reduced, the first voltage sampling point connector can realize better welding and contact through the PCB and the copper-aluminum composite sheet, and the copper-aluminum composite sheet can realize better welding and contact with the aluminum bar connecting piece.

Description

Aluminum bar connecting piece with novel voltage sampling points and preparation method thereof
Technical Field
The invention relates to the technical field of battery connecting pieces, in particular to an aluminum bar connecting piece with novel voltage sampling points and a preparation method thereof.
Background
In the industry of new energy batteries, battery voltage sampling points can be installed on battery connectors, and the connection mode of the current battery voltage sampling points can include the following: 1. drilling holes in an aluminum row of the battery connecting piece, connecting the holes by using a nut and a screw, and crimping a connector at one end of a sampling wire harness; 2. a flexible PCB is adopted, a nickel sheet extends out of the side face of the flexible PCB, and the nickel sheet is welded on an aluminum bar of the battery connecting piece by using a laser welding technology; 3. one end (bare copper) of the sampling wire bundle is directly welded on the aluminum row of the battery connecting piece by using an ultrasonic welding technology. However, 1 st mode is connected with the nut screw rod, the manual installation is inconvenient, and it is not hard up easily, the contact is not good, 2 nd mode is welded the nickel piece with laser welding technique, if follow-up battery of changing, the nickel piece can not be dismantled, can only change whole flexible PCB board together, the cost is too high, 3 rd mode is arranged on the aluminium row of battery connecting piece copper line lug weld with ultrasonic welding technique, if follow-up battery of changing, also can not dismantle, can only change whole sampling pencil together, the cost is higher.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an aluminum row connecting piece with a novel voltage sampling point and a preparation method thereof.
In order to achieve the above object, a first aspect of the present invention provides an aluminum busbar connecting piece with a novel voltage sampling point, comprising an aluminum busbar connecting piece body for connecting a battery, a PCB, a copper-aluminum composite sheet and a first voltage sampling point connector for detachably connecting with a second voltage sampling point connector on a voltage sampling flexible circuit board, wherein the first voltage sampling point connector is welded on a first surface of the PCB, the copper-aluminum composite sheet comprises an aluminum sheet and a copper sheet with an area smaller than that of the aluminum sheet, the second surface of the copper sheet is plated with nickel to form a nickel-plated surface, the nickel-plated surface of the copper sheet is welded with the first surface of the aluminum sheet, a plurality of copper welding spots are arranged on a side surface of the PCB, the welding spots of the PCB are electrically connected with pins of the first voltage sampling point connector through a line arranged on the PCB, and the welding spots of the PCB are welded on the first surface of the copper sheet, thereby make the laminating of the second surface of PCB board fix on the copper sheet, the aluminum sheet welds together with aluminium row connecting piece body.
Preferably, the first voltage sampling point connector is provided as a plug type connector or a contact type connector.
Preferably, the thickness of the aluminum sheet is set to be 0.4 mm-0.7 mm, and the thickness of the copper sheet is set to be 0.03 mm-0.06 mm.
The invention provides a preparation method of an aluminum row connecting piece with a novel voltage sampling point, which comprises the following steps:
(1) preparing the copper-aluminum composite sheet: electroplating nickel on the second surface of the copper sheet to form a nickel-plated surface, and then welding the nickel-plated surface of the copper sheet and the first surface of the aluminum sheet together to prepare a copper-aluminum composite sheet;
(2) welding the connector and the PCB: welding a first voltage sampling point connector on the first surface of the PCB;
(3) welding the PCB and the copper-aluminum composite sheet: welding the welding spots of the PCB processed in the step (2) on the first surface of the copper sheet of the copper-aluminum composite sheet, so that the second surface of the PCB is attached and fixed on the copper sheet, and a novel voltage sampling point is manufactured;
(4) welding the voltage sampling point and the aluminum bar: and (4) welding the aluminum sheet of the copper-aluminum composite sheet processed in the step (3) with the aluminum bar connecting piece body.
Preferably, in the step (1), the nickel-plated surface of the copper sheet is welded with the first surface of the aluminum sheet by polymer diffusion welding.
Preferably, in the step (2), the first voltage sampling point connector is soldered on the first surface of the PCB board by SMT reflow soldering; in the step (3), the welding points of the PCB are welded on the first surface of the copper sheet in an SMT reflow soldering mode.
Preferably, in the step (4), the aluminum sheet is welded with the aluminum row connector body by means of laser welding.
Preferably, the laser welding specifically comprises the following steps:
(41) fixing the aluminum bar connecting piece body on a workbench of a laser welding machine through a laser welding positioning jig, and respectively pressing two side parts of an aluminum sheet of the copper-aluminum composite sheet on the aluminum bar connecting piece body through the laser welding positioning jig;
(42) the PCB and the first voltage sampling point connector are covered by the protective cover, and the PCB and the first voltage sampling point connector are protected;
(43) the laser of output through laser-beam welding machine carries out laser welding to aluminum sheet and aluminium row connecting piece body to make novel voltage sampling point and aluminium row welding together.
Preferably, in the laser welding process, the laser wavelength of the laser welding machine is set to be 1068 nm-1080 nm, the laser output power is set to be 1200W-1800W, the welding speed is set to be 60 mm/s-120 mm/s, and the welding type of the aluminum sheet and the aluminum row connecting piece body is linear.
Preferably, the laser welding positioning jig comprises a jig bottom plate, a vertical mounting plate, a sliding plate lifting driving device, a positioning clamp mounting seat and a pressing positioning clamp for respectively pressing two side parts of an aluminum sheet of the copper-aluminum composite sheet on the aluminum row connecting piece body, the vertical mounting plate is mounted on the jig bottom plate, the sliding plate is connected with the vertical mounting plate in a sliding mode, the sliding plate lifting driving device is mounted on the vertical mounting plate and connected with the sliding plate, the sliding plate lifting driving device can drive the sliding plate to move up and down, the positioning clamp mounting seat is mounted on two sides of the bottom of the sliding plate, and the pressing positioning clamp is mounted on the two positioning clamp mounting seats.
Compared with the prior art, the invention has the beneficial effects that:
1. the aluminum bar connecting piece adopts a novel voltage sampling point structure, the first voltage sampling point connector can be detachably connected with the second voltage sampling point connector on the voltage sampling flexible circuit board, the aluminum bar connecting piece and the voltage sampling flexible circuit board are convenient to mount and dismount, when a battery needs to be replaced, the aluminum bar connecting piece and the voltage sampling flexible circuit board do not need to be replaced together, and the cost is reduced.
2. The novel voltage sampling point comprises a PCB, a copper-aluminum composite sheet and a first voltage sampling point connector, wherein the first voltage sampling point connector can realize better welding and contact through the PCB and the copper-aluminum composite sheet, and the copper-aluminum composite sheet can realize better welding and contact with an aluminum row connecting piece.
3. The novel voltage sampling point adopts a mode that the copper-aluminum composite sheet is matched with the aluminum bar connecting piece, so that the laser welding operation of the copper-aluminum composite sheet and the aluminum bar connecting piece is facilitated, and the problem that the existing copper-clad PCB or connector cannot be directly welded on the aluminum bar connecting piece is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a partial structure of an aluminum row connector with a novel voltage sampling point according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a novel voltage sampling point provided by an embodiment of the present invention;
fig. 3 is a cross-sectional view of a copper-aluminum composite sheet according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a laser welding machine provided by an embodiment of the present invention;
fig. 5 is an assembly diagram of a laser welding positioning jig and an aluminum row connecting piece with a novel voltage sampling point provided by the embodiment of the invention;
fig. 6 is a schematic structural diagram of a laser welding positioning fixture according to an embodiment of the present invention;
fig. 7 is an enlarged view of a location of a nip provided in an embodiment of the present invention;
fig. 8 is an exploded view of the swage setting clip and the slide plate according to the embodiment of the present invention;
fig. 9 is a schematic structural diagram of a voltage sampling flexible circuit board and a second voltage sampling point connector according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an aluminum busbar connector with a novel voltage sampling point, including an aluminum busbar connector body 1 for connecting a battery (such as a battery module) and a novel voltage sampling point welded at one end of the aluminum busbar connector body 1, and the following describes each component of this embodiment in detail with reference to the accompanying drawings.
When the aluminum row connecting piece is specifically implemented, the aluminum row connecting piece body 1 can be formed by stacking and welding a plurality of aluminum foils, and a square heat dissipation block can be arranged on the aluminum row connecting piece body 1.
As shown in fig. 2 and 3, the novel voltage sampling point may include a PCB board 2, a copper-aluminum composite sheet 3 and a first voltage sampling point connector 4, the first voltage sampling point connector 4 is welded on a first surface of the PCB board 2, the copper-aluminum composite sheet 3 includes an aluminum sheet 31 and a copper sheet 32 having an area smaller than that of the aluminum sheet 31, thereby nickel is plated on a second surface of the copper sheet 32 to form a nickel-plated surface 33, the nickel-plated surface 33 of the copper sheet 32 is welded together with the first surface of the aluminum sheet 31, a side surface of the PCB board 2 is provided with a plurality of copper welding spots 21, the welding spots 21 of the PCB board 2 are electrically connected with pins of the first voltage sampling point connector 4 through a circuit arranged on the PCB board 2, the welding spots 21 of the PCB board 2 are welded on the first surface of the copper sheet 32, thereby the second surface of the PCB board 2 is attached and fixed on the copper sheet 32, the aluminum sheet 31 is welded together with an aluminum row connector body 1.
Wherein, a nickel plating layer is arranged between the copper sheet 32 and the aluminum sheet 31, which is beneficial to the welding of the copper sheet 32 and the aluminum sheet 31 together in a macromolecule diffusion welding mode.
Preferably, the first voltage sampling point connector 4 may be provided as a plug type connector, a contact type connector, or other various connectors that are easily detachable.
In specific implementation, the thickness of the aluminum sheet 31 can be preferably set to be 0.4 mm-0.7 mm as obtained through finite element analysis simulation experiments, so that the problem of thermal expansion stress in reflow soldering can be well solved, and the aluminum sheet 31 is prevented from being damaged by cracking and the like. In addition, the thickness design of aluminum sheet 31 also is based on the clearance consideration of structure, and it makes things convenient for the clamping of aluminum sheet and tool.
The thickness of the copper sheet 32 can be preferably set to be 0.03 mm-0.06 mm through finite element analysis simulation experiments, so that the problem of thermal expansion stress in reflow soldering is well solved, and the copper sheet 32 is prevented from being damaged by cracking and the like.
The preparation method of the aluminum row connecting piece with the novel voltage sampling points comprises the following steps:
(1) preparing the copper-aluminum composite sheet: electroplating nickel on the second surface of the copper sheet 32 to form a nickel-plated surface 33, and then welding the nickel-plated surface 33 of the copper sheet 32 and the first surface of the aluminum sheet 31 together to manufacture the copper-aluminum composite sheet 3;
in step (1), the nickel-plated surface 33 of the copper sheet 32 may be welded to the first surface of the aluminum sheet 31 by polymer diffusion welding.
(2) Welding the connector and the PCB: welding a first voltage sampling point connector 4 on the first surface of the PCB 2;
in step (2), the first voltage sampling point connector 4 may be soldered on the first surface of the PCB board 2 by SMT reflow soldering.
(3) Welding the PCB and the copper-aluminum composite sheet: welding the welding spots 21 of the PCB 2 processed in the step (2) on the first surface of the copper sheet 32 of the copper-aluminum composite sheet 3, so that the second surface of the PCB 2 is attached and fixed on the copper sheet 32, and a novel voltage sampling point is manufactured;
in step (3), the solder points 21 of the PCB board 2 may be soldered on the first surface of the copper sheet 32 by SMT reflow soldering.
(4) Welding the voltage sampling point and the aluminum bar: and (4) welding the aluminum sheet 31 of the copper-aluminum composite sheet 3 treated in the step (3) with the aluminum bar connecting piece body 1.
In step (4), the aluminum sheet 31 may be welded with the aluminum row connector body 1 by means of laser welding. The laser welding specifically comprises the following steps:
(41) the aluminum bar connecting piece body 1 is fixed on a workbench of a laser welding machine through a laser welding positioning jig 100, and two side parts of an aluminum sheet 31 of the copper-aluminum composite sheet 3 are respectively pressed on the aluminum bar connecting piece body 1 through the laser welding positioning jig;
(42) the PCB 2 and the first voltage sampling point connector 4 are covered by a protective cover 19, and the PCB 2 and the first voltage sampling point connector 4 are protected;
(43) the laser beam of 8 output of position is sent out through laser-beam welding machine's laser and carries out laser welding to aluminum sheet 31 and aluminium row connecting piece body 1 to make novel voltage sampling point and aluminium row welding together.
As shown in fig. 5 and 6, the laser welding positioning jig 100 may include a jig bottom plate 11, a vertical mounting plate 12, a sliding plate 13, a sliding plate lifting driving device 14, a positioning clamp mounting seat 15, and a swaging positioning clamp 16 for pressing two side portions of an aluminum sheet 31 of the copper-aluminum composite sheet 3 onto the aluminum busbar connecting member body 1, respectively.
As shown in fig. 5 and 6, the front end of the jig base plate 11 is provided with a containing groove 111 for inserting the end of the aluminum row connecting piece body 1, the groove wall of the containing groove 111 can realize the limit contact with the end surface and the side surface of the aluminum row connecting piece body 1, and the end surface and the side surface of the aluminum row connecting piece body 1 can lean against the groove wall surface of the containing groove 111, so that the positioning of the aluminum row connecting piece body 1 is facilitated.
As shown in fig. 6, the vertical mounting plate 12 is mounted on the jig base plate 11, and the sliding plate 13 can be slidably connected to the vertical mounting plate 12 through a sliding block 17 and a longitudinally arranged sliding rail 18.
As shown in fig. 6, a sliding plate lifting driving device 14 is installed on the vertical mounting plate 12 and connected to the sliding plate 13, and the sliding plate lifting driving device 14 can drive the sliding plate 13 to move up and down. Specifically, in the present embodiment, the sliding plate lifting driving device 14 may include a hand clamp mounting plate 141 and a hand clamp 142, the hand clamp 142 is mounted on the top of the vertical mounting plate 12 through the hand clamp mounting plate 141, and an output shaft of the hand clamp 142 is connected to the sliding plate 13. During operation, the handle of the manual clamp 142 can be pulled, so that the output shaft of the manual clamp 142 drives the sliding plate 13 to lift.
As shown in fig. 6, 7 and 8, the positioning clamp mounting seats 15 are mounted on both sides of the bottom of the sliding plate 13, and the swaging positioning clamps 16 are mounted on both the positioning clamp mounting seats 15. Specifically, the swaging clamp 16 may include swaging clamp 161, a pin 162 and a torsion spring 163, the swaging clamp 161 is pivotally connected to a slot of the positioning clamp mounting seat 15 through the pin 162, the torsion spring 163 is mounted on the pin 162, two elastic arms of the torsion spring 163 are respectively abutted to the swaging clamp 161 and the positioning clamp mounting seat 15, a downward chuck 1611 is disposed at a lower end of the swaging clamp 161, and the chuck 1611 of the swaging clamp 161 can press a side portion of the aluminum sheet 31.
Wherein, in order to open the pressing clamping jaw 161 conveniently, the upper end of the pressing clamping jaw 161 can be further provided with a toggle part 1612 which is obliquely arranged upwards.
Preferably, in order to prevent the positioning clamp mounting seat 15 from crushing the aluminum bar connecting piece body 1 when descending along with the sliding plate 13, a guide pin 10 and a spring 20 may be further disposed between the positioning clamp mounting seat 15 and the bottom of the sliding plate 13, the upper end of the guide pin 10 penetrates through a through hole of the positioning clamp mounting seat 15 and is fixedly connected with the bottom of the sliding plate 13, the spring 20 is sleeved on the guide pin 10, and the positioning clamp mounting seat 15 can move up and down under the elastic force action of the spring 20 to play a role in buffering.
As shown in fig. 6, the protection cover 19 is located between the two swaging positioning clamps 16, and when laser welding is performed, the protection cover 19 can protect the PCB 2 and the first voltage sampling point connector 4 of the voltage sampling point, so as to prevent laser from damaging the PCB 2 and the first voltage sampling point connector 4, thereby improving the quality of welding processing.
As shown in fig. 4 and 5, in operation, the aluminum busbar connecting piece body 1 may be inserted into the accommodating groove 111 of the jig bottom plate 11, then the swaging clamp 16 on the positioning clamp mounting seat 15 is driven to move downward by the manual clamp 142, the swaging clamp 161 is opened, the voltage sampling point is placed at a designated position of the aluminum busbar connecting piece body 1, then the two swaging clamp 161 are used to press the two side portions of the aluminum sheet 31 at the voltage sampling point respectively to position the aluminum sheet, then the protective cover 19 is covered outside the PCB 2 at the voltage sampling point and the first voltage sampling point connector 4, at this time, the gap between the swaging clamp 161 and the protective cover 19 exposes a local area of the aluminum sheet 31, and finally, the local area may be laser-welded by the laser welding machine, so that the aluminum sheet 31 and the aluminum busbar connecting piece body 1 are fixed together.
During the laser welding, the laser wavelength of the laser welding machine can be set to be 1068 nm-1080 nm preferably, the laser output power can be set to be 1200W-1800W preferably, and the welding speed can be set to be 60 mm/s-120 mm/s preferably. As shown in fig. 1, the welding type of the aluminum sheet 31 and the aluminum row connecting piece body 1 is linear, and the welding joint 7 is in the shape of a linear strip.
During connection, as shown in fig. 2 and 9, the first voltage sampling point connector 4 on the aluminum row connector body 1 can be detachably connected with the second voltage sampling point connector 6 on the voltage sampling flexible circuit board 5, and the second voltage sampling point connector 6 is also set to be a plug-in type connector, a contact type connector or other various connectors convenient to detach and matched with the first voltage sampling point connector 4. When the first voltage sampling point connector 4 is a male terminal, the second voltage sampling point connector 6 is a female terminal, and when the first voltage sampling point connector 4 is a female terminal, the second voltage sampling point connector 6 is a male terminal.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. An aluminum bar connecting piece with novel voltage sampling points comprises an aluminum bar connecting piece body used for connecting a battery, and is characterized by further comprising a PCB (printed circuit board), a copper-aluminum composite sheet and a first voltage sampling point connector used for realizing detachable connection with a second voltage sampling point connector on a voltage sampling flexible circuit board, wherein the first voltage sampling point connector is welded on the first surface of the PCB, the copper-aluminum composite sheet comprises an aluminum sheet and a copper sheet of which the area is smaller than that of the aluminum sheet, the second surface of the copper sheet is plated with nickel to form a nickel-plated surface, the nickel-plated surface of the copper sheet is welded with the first surface of the aluminum sheet, a plurality of copper welding points are arranged on the side surface of the PCB, the welding points of the PCB are electrically connected with pins of the first voltage sampling point connector through a circuit arranged on the PCB, and the PCB is welded on the first surface of the copper sheet, thereby make the laminating of the second surface of PCB board fix on the copper sheet, the aluminum sheet welds together with aluminium row connecting piece body.
2. The aluminum busbar connecting piece with the novel voltage sampling point as claimed in claim 1, wherein the first voltage sampling point connector is configured as a plug-type connector or a contact-type connector.
3. The aluminum bar connecting piece with the novel voltage sampling point as claimed in claim 1, wherein the thickness of the aluminum sheet is set to 0.4 mm-0.7 mm, and the thickness of the copper sheet is set to 0.03 mm-0.06 mm.
4. The preparation method of the aluminum row connecting piece with the novel voltage sampling point, disclosed by any one of claims 1 to 3, is characterized by comprising the following steps of:
(1) preparing the copper-aluminum composite sheet: electroplating nickel on the second surface of the copper sheet to form a nickel-plated surface, and then welding the nickel-plated surface of the copper sheet and the first surface of the aluminum sheet together to prepare a copper-aluminum composite sheet;
(2) welding the connector and the PCB: welding a first voltage sampling point connector on the first surface of the PCB;
(3) welding the PCB and the copper-aluminum composite sheet: welding the welding spots of the PCB processed in the step (2) on the first surface of the copper sheet of the copper-aluminum composite sheet, so that the second surface of the PCB is attached and fixed on the copper sheet, and a novel voltage sampling point is manufactured;
(4) welding the voltage sampling point and the aluminum bar: and (4) welding the aluminum sheet of the copper-aluminum composite sheet processed in the step (3) with the aluminum bar connecting piece body.
5. The method for preparing an aluminum row connector with novel voltage sampling points as claimed in claim 1, wherein in the step (1), the nickel-plated surface of the copper sheet is welded with the first surface of the aluminum sheet by a polymer diffusion welding method.
6. The method for preparing an aluminum bar connecting piece with novel voltage sampling points according to claim 1, wherein in the step (2), the first voltage sampling point connector is welded on the first surface of the PCB board in an SMT reflow soldering mode; in the step (3), the welding points of the PCB are welded on the first surface of the copper sheet in an SMT reflow soldering mode.
7. The method for preparing an aluminum row connecting piece with novel voltage sampling points as claimed in claim 1, wherein in the step (4), the aluminum sheet is welded with the aluminum row connecting piece body by means of laser welding.
8. The method for preparing an aluminum row connecting piece with novel voltage sampling points according to claim 7, wherein the laser welding specifically comprises the following steps:
(41) fixing the aluminum bar connecting piece body on a workbench of a laser welding machine through a laser welding positioning jig, and respectively pressing two side parts of an aluminum sheet of the copper-aluminum composite sheet on the aluminum bar connecting piece body through the laser welding positioning jig;
(42) the PCB and the first voltage sampling point connector are covered by the protective cover, and the PCB and the first voltage sampling point connector are protected;
(43) the laser of output through laser-beam welding machine carries out laser welding to aluminum sheet and aluminium row connecting piece body to make novel voltage sampling point and aluminium row welding together.
9. The method for preparing an aluminum row connecting piece with novel voltage sampling points as claimed in claim 7 or 8, wherein in the laser welding process, the laser wavelength of a laser welding machine is set to be 1068 nm-1080 nm, the laser output power is set to be 1200W-1800W, the welding speed is set to be 60 mm/s-120 mm/s, and the welding type of the aluminum sheet and the aluminum row connecting piece body is linear.
10. The method for manufacturing an aluminum busbar connecting piece with novel voltage sampling points as claimed in claim 8, wherein the laser welding positioning jig comprises a jig bottom plate, a vertical mounting plate, a sliding plate lifting driving device, a positioning clamp mounting seat and a swaging positioning clamp for respectively pressing two side parts of an aluminum sheet of the copper-aluminum composite sheet onto the aluminum busbar connecting piece body, wherein the vertical mounting plate is mounted on the jig bottom plate, the sliding plate is slidably connected with the vertical mounting plate, the sliding plate lifting driving device is mounted on the vertical mounting plate and connected with the sliding plate, the sliding plate lifting driving device can drive the sliding plate to move up and down, the positioning clamp mounting seat is mounted on two sides of the bottom of the sliding plate, and the swaging positioning clamp is mounted on two positioning clamp mounting seats.
CN202111058904.6A 2021-09-10 2021-09-10 Aluminum bar connecting piece with novel voltage sampling points and preparation method thereof Pending CN113871740A (en)

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CN211125798U (en) * 2019-12-31 2020-07-28 东莞市佳超五金科技有限公司 Diffusion welding copper-aluminum busbar
CN213398858U (en) * 2020-09-08 2021-06-08 浙江零跑科技有限公司 Sampling structure of battery module

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CN211125798U (en) * 2019-12-31 2020-07-28 东莞市佳超五金科技有限公司 Diffusion welding copper-aluminum busbar
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