A method for manufacturing an aluminum busbar connector with a voltage sampling point

Abstract

The application discloses an aluminum bar connecting piece with a voltage sampling point and a preparation method thereof. The aluminum bar connecting piece comprises an aluminum bar connecting piece body, a PCB, a copper-aluminum composite sheet and a first voltage sampling point connector. The preparation method comprises the following steps: preparing the copper-aluminum composite sheet, welding the connector and the PCB, welding the PCB and the copper-aluminum composite sheet, welding the voltage sampling point and the aluminum bar, and the like. The first voltage sampling point connector can be detachably connected with a second voltage sampling point connector on a voltage sampling flexible circuit board, facilitating the installation and dismounting of the aluminum bar connecting piece and the voltage sampling flexible circuit board. When the battery needs to be replaced, the voltage sampling flexible circuit board does not need to be replaced, thereby reducing the cost. The first voltage sampling point connector can be better welded and contacted with the copper-aluminum composite sheet through the PCB, and the copper-aluminum composite sheet can be better welded and contacted with the aluminum bar connecting piece.

Description

Technical Field

[0001] This invention relates to the field of battery connector technology, and more specifically, to an aluminum busbar connector with voltage sampling points and its preparation method. Background Technology

[0002] In the new energy battery industry, battery connectors can be equipped with battery voltage sampling points. Current connection methods for these sampling points include: 1. Drilling holes in the aluminum busbar of the battery connector, connecting it with nuts and bolts, and crimping a connector to one end of the sampling harness; 2. Using a flexible PCB board, extending nickel sheets from the side of the flexible PCB board, and then using laser welding technology to weld the nickel sheets to the aluminum busbar of the battery connector; 3. Directly welding one end of the sampling harness (bare copper) to the aluminum busbar of the battery connector using ultrasonic welding technology. However, the first method, using nuts and bolts, is inconvenient for manual installation and prone to loosening and poor contact. The second method, using laser welding technology to weld the nickel sheets, cannot be removed if the battery needs to be replaced later; the entire flexible PCB board must be replaced, which is too costly. The third method, using ultrasonic welding technology to directly weld the copper wires to the aluminum busbar of the battery connector, also cannot be removed if the battery needs to be replaced later; the entire sampling harness must be replaced, which is also costly. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an aluminum busbar connector with voltage sampling points and its preparation method.

[0004] To achieve the above objectives, a first aspect of the present invention provides an aluminum busbar connector with voltage sampling points, comprising an aluminum busbar connector body for battery connection, a PCB board, a copper-aluminum composite sheet, and a first voltage sampling point connector for detachable connection with a second voltage sampling point connector on a voltage sampling flexible circuit board. The first voltage sampling point connector is soldered to a first surface of the PCB board. The copper-aluminum composite sheet comprises an aluminum sheet and a copper sheet with an area smaller than the aluminum sheet. Nickel is electroplated on a second surface of the copper sheet to form a nickel-plated surface. The nickel-plated surface of the copper sheet is soldered to the first surface of the aluminum sheet. A plurality of copper solder joints are provided on the side of the PCB board. The solder joints of the PCB board are electrically connected to the pins of the first voltage sampling point connector through lines arranged on the PCB board. The solder joints of the PCB board are soldered to the first surface of the copper sheet, thereby fixing the second surface of the PCB board to the copper sheet. The aluminum sheet is soldered to the aluminum busbar connector body.

[0005] Preferably, the first voltage sampling point connector is configured as a plug-in connector or a contact connector.

[0006] Preferably, the thickness of the aluminum sheet is set to 0.4 mm to 0.7 mm, and the thickness of the copper sheet is set to 0.03 mm to 0.06 mm.

[0007] A second aspect of the present invention provides a method for manufacturing an aluminum busbar connector with voltage sampling points, comprising the following steps:

[0008] (1) Preparation of copper-aluminum composite sheet: nickel is electroplated on the second surface of the copper sheet to form a nickel-plated surface, and then the nickel-plated surface of the copper sheet is welded to the first surface of the aluminum sheet to form a copper-aluminum composite sheet.

[0009] (2) Soldering the connector to the PCB board: Solder the first voltage sampling point connector to the first surface of the PCB board;

[0010] (3) Welding of PCB board and copper-aluminum composite sheet: Weld the solder joints of the PCB board processed in step (2) to the first surface of the copper sheet of the copper-aluminum composite sheet, so that the second surface of the PCB board is attached and fixed to the copper sheet to obtain voltage sampling points.

[0011] (4) Welding of voltage sampling points and aluminum busbars: Weld the aluminum sheet of the copper-aluminum composite sheet processed in step (3) together with the aluminum busbar connector body.

[0012] Preferably, in step (1), the nickel-plated surface of the copper sheet is welded to the first surface of the aluminum sheet by polymer diffusion welding.

[0013] Preferably, in step (2), the first voltage sampling point connector is soldered to the first surface of the PCB board by SMT reflow soldering; in step (3), the solder joints of the PCB board are soldered to the first surface of the copper sheet by SMT reflow soldering.

[0014] Preferably, in step (4), the aluminum sheet is welded to the aluminum busbar connector body by laser welding.

[0015] Preferably, the laser welding specifically includes the following steps:

[0016] (41) Fix the aluminum busbar connector body on the worktable of the laser welding machine using a laser welding positioning fixture, and press the two sides of the aluminum sheet of the copper-aluminum composite sheet onto the aluminum busbar connector body using a laser welding positioning fixture.

[0017] (42) The PCB board and the first voltage sampling point connector are covered by a protective cover to protect the PCB board and the first voltage sampling point connector;

[0018] (43) The aluminum sheet and aluminum busbar connector body are laser welded by the laser output of the laser welding machine, so that the voltage sampling point is welded together with the aluminum busbar.

[0019] Preferably, during the laser welding process, the laser wavelength of the laser welding machine is set to 1068nm~1080nm, the laser output power is set to 1200W~1800W, the welding speed is set to 60mm / s~120mm / s, and the welding type of the aluminum sheet and the aluminum busbar connector body is linear.

[0020] Preferably, the laser welding positioning fixture includes a fixture base plate, a vertical mounting plate, a sliding plate, a sliding plate lifting drive device, a positioning clamp mounting base, and a pressing positioning clamp for pressing the two sides of the aluminum sheet of the copper-aluminum composite sheet onto the aluminum busbar connector body. The vertical mounting plate is mounted on the fixture base plate, the sliding plate is slidably connected to the vertical mounting plate, the sliding plate lifting drive device is mounted on the vertical mounting plate and connected to the sliding plate, and the sliding plate lifting drive device can drive the sliding plate to move up and down. The positioning clamp mounting base is mounted on both sides of the bottom of the sliding plate, and the pressing positioning clamp is mounted on the two positioning clamp mounting bases.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The aluminum busbar connector of the present invention adopts a voltage sampling point structure. The first voltage sampling point connector can be detachably connected to the second voltage sampling point connector on the voltage sampling flexible circuit board, which facilitates the installation and removal of the aluminum busbar connector and the voltage sampling flexible circuit board. When the battery needs to be replaced, it is not necessary to replace the voltage sampling flexible circuit board together, thus reducing costs.

[0023] 2. The voltage sampling point of the present invention includes a PCB board, a copper-aluminum composite sheet, and a first voltage sampling point connector. The first voltage sampling point connector can achieve better welding and contact with the copper-aluminum composite sheet through the PCB board, and the copper-aluminum composite sheet can achieve better welding and contact with the aluminum busbar connector.

[0024] 3. The voltage sampling point of this invention adopts a copper-aluminum composite sheet combined with an aluminum busbar connector, which is beneficial for laser welding of the copper-aluminum composite sheet and the aluminum busbar connector, and solves the problem that existing copper-clad PCB boards or connectors cannot be directly welded to the aluminum busbar connector. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a partial structural schematic diagram of the aluminum busbar connector with voltage sampling points provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the voltage sampling point provided in an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the copper-aluminum composite sheet provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the laser welding machine provided in an embodiment of the present invention;

[0030] Figure 5 This is an assembly drawing of the laser welding positioning fixture and the aluminum busbar connector with voltage sampling points provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the laser welding positioning fixture provided in an embodiment of the present invention;

[0032] Figure 7 This is an enlarged view of the position of the pressure positioning clamp provided in the embodiment of the present invention;

[0033] Figure 8 This is an exploded view of the pressure positioning clamp and sliding plate provided in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the structure of the voltage sampling flexible circuit board and the second voltage sampling point connector provided in the embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please refer to Figure 1The present invention provides an aluminum busbar connector with voltage sampling points, including an aluminum busbar connector body 1 for battery connection (such as battery module) and voltage sampling points welded to one end of the aluminum busbar connector body 1. The components of this embodiment will be described in detail below with reference to the accompanying drawings.

[0037] In practice, the aluminum busbar connector body 1 can be formed by stacking and welding several aluminum foil sheets, and square heat dissipation blocks can be provided on the aluminum busbar connector body 1.

[0038] like Figure 2 and Figure 3 As shown, the 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 soldered to the first surface of the PCB board 2. The copper-aluminum composite sheet 3 includes an aluminum sheet 31 and a copper sheet 32 ​​with an area smaller than the aluminum sheet 31. Nickel is electroplated on the 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 soldered to the first surface of the aluminum sheet 31. Several copper solder joints 21 are provided on the side of the PCB board 2. The solder joints 21 of the PCB board 2 are electrically connected to the pins of the first voltage sampling point connector 4 through the lines arranged on the PCB board 2. The solder joints 21 of the PCB board 2 are soldered to the first surface of the copper sheet 32, so that the second surface of the PCB board 2 is attached and fixed to the copper sheet 32. The aluminum sheet 31 is soldered to the aluminum busbar connector body 1.

[0039] The nickel plating layer between the copper sheet 32 ​​and the aluminum sheet 31 facilitates the welding of the copper sheet 32 ​​to the aluminum sheet 31 via polymer diffusion welding.

[0040] Preferably, the first voltage sampling point connector 4 can be configured as a plug-in connector, a contact connector, or other connectors that are easy to disassemble.

[0041] In practical implementation, finite element analysis simulation experiments showed that the thickness of the aluminum sheet 31 can be preferably set to 0.4mm~0.7mm, which effectively solves the problem of thermal expansion stress during reflow soldering and prevents damage such as cracking of the aluminum sheet 31. In addition, the thickness design of the aluminum sheet 31 is also based on structural clearance considerations, which facilitates the clamping of the aluminum sheet and the fixture.

[0042] Through finite element analysis simulation experiments, it was found that the thickness of copper sheet 32 ​​can be preferably set to 0.03 mm to 0.06 mm, which effectively solves the problem of thermal expansion stress during reflow soldering and prevents damage such as cracking of copper sheet 32.

[0043] The method for preparing an aluminum busbar connector with voltage sampling points includes the following steps:

[0044] (1) Preparation of copper-aluminum composite sheet: nickel is electroplated on the second surface of copper sheet 32 ​​to form nickel-plated surface 33, and then the nickel-plated surface 33 of copper sheet 32 ​​is welded together with the first surface of aluminum sheet 31 to form copper-aluminum composite sheet 3.

[0045] In step (1), the nickel-plated surface 33 of the copper sheet 32 ​​can be welded to the first surface of the aluminum sheet 31 by polymer diffusion welding.

[0046] (2) Soldering the connector to the PCB board: Solder the first voltage sampling point connector 4 to the first surface of the PCB board 2;

[0047] In step (2), the first voltage sampling point connector 4 can be soldered onto the first surface of the PCB board 2 by SMT reflow soldering.

[0048] (3) Welding of PCB board and copper-aluminum composite sheet: Weld the solder joint 21 of PCB board 2 processed in step (2) to the first surface of copper sheet 32 ​​of copper-aluminum composite sheet 3, so that the second surface of PCB board 2 is attached and fixed to copper sheet 32, and voltage sampling point is obtained.

[0049] In step (3), the solder joints 21 of the PCB board 2 can be soldered to the first surface of the copper sheet 32 ​​by SMT reflow soldering.

[0050] (4) Welding of voltage sampling point and aluminum busbar: Weld the aluminum sheet 31 of the copper-aluminum composite sheet 3 processed in step (3) together with the aluminum busbar connector body 1.

[0051] In step (4), the aluminum sheet 31 can be welded to the aluminum busbar connector body 1 by laser welding. Specifically, the laser welding includes the following steps:

[0052] (41) The aluminum busbar connector body 1 is fixed on the worktable of the laser welding machine by the laser welding positioning fixture 100, and the two sides of the aluminum sheet 31 of the copper-aluminum composite sheet 3 are pressed onto the aluminum busbar connector body 1 by the laser welding positioning fixture.

[0053] (42) The PCB board 2 and the first voltage sampling point connector 4 are covered by the protective cover 19 to protect the PCB board 2 and the first voltage sampling point connector 4;

[0054] (43) The laser emitted by the laser emitting part 8 of the laser welding machine is used to perform laser welding on the aluminum sheet 31 and the aluminum busbar connector body 1, thereby welding the voltage sampling point together with the aluminum busbar.

[0055] like Figure 5 and Figure 6As shown, the laser welding positioning fixture 100 may include a fixture base plate 11, a vertical mounting plate 12, a sliding plate 13, a sliding plate lifting drive device 14, a positioning clamp mounting base 15, and a pressing positioning clamp 16 for pressing the two sides of the aluminum sheet 31 of the copper-aluminum composite sheet 3 onto the aluminum busbar connector body 1.

[0056] like Figure 5 and Figure 6 As shown, the front end of the fixture base plate 11 is provided with a receiving groove 111 for inserting the end of the aluminum busbar connector body 1. The groove wall of the receiving groove 111 can make limiting contact with the end face and side face of the aluminum busbar connector body 1. The end face and side face of the aluminum busbar connector body 1 can rest against the groove wall of the receiving groove 111, which facilitates the positioning of the aluminum busbar connector body 1.

[0057] like Figure 6 As shown, the vertical mounting plate 12 is mounted on the fixture base plate 11, and the sliding plate 13 can be slidably connected to the vertical mounting plate 12 through the slider 17 and the longitudinally arranged slide rail 18.

[0058] like Figure 6 As shown, the sliding plate lifting drive device 14 is mounted on the vertical mounting plate 12 and connected to the sliding plate 13. The sliding plate lifting drive device 14 can drive the sliding plate 13 to move up and down. Specifically, in this embodiment, the sliding plate lifting drive device 14 may include a hand clamp mounting plate 141 and a manual clamp 142. The manual clamp 142 is mounted on the top of the vertical mounting plate 12 through the hand clamp mounting plate 141, and the output shaft of the manual clamp 142 is connected to the sliding plate 13. During operation, the handle of the manual clamp 142 can be turned to cause the output shaft of the manual clamp 142 to drive the sliding plate 13 to move up and down.

[0059] like Figure 6 , Figure 7 and Figure 8 As shown, the positioning clamp mounting base 15 is installed on both sides of the bottom of the sliding plate 13, and the pressing positioning clamp 16 is installed on the two positioning clamp mounting bases 15. Specifically, the pressing positioning clamp 16 may include a pressing clamp 161, a pin 162 and a torsion spring 163. The pressing clamp 161 is pivotally connected to the groove of the positioning clamp mounting base 15 through the pin 162. The torsion spring 163 is installed on the pin 162. The two elastic arms of the torsion spring 163 abut against the pressing clamp 161 and the positioning clamp mounting base 15, respectively. The lower end of the pressing clamp 161 is provided with a downwardly facing clamp head 1611. The clamp head 1611 of the pressing clamp 161 can press the side part of the aluminum sheet 31.

[0060] In order to facilitate opening the clamping jaw 161, the upper end of the clamping jaw 161 may also be provided with an upwardly inclined actuating part 1612.

[0061] Preferably, in order to prevent the positioning clamp mounting base 15 from crushing the aluminum strip connector body 1 when it descends with the sliding plate 13, a guide pin 10 and a spring 20 can also be provided between the positioning clamp mounting base 15 and the bottom of the sliding plate 13. The upper end of the guide pin 10 passes through the through hole of the positioning clamp mounting base 15 and is fixedly connected to the bottom of the sliding plate 13. The spring 20 is fitted on the guide pin 10, and the positioning clamp mounting base 15 can move up and down under the elastic force of the spring 20, which plays a buffering role.

[0062] like Figure 6 As shown, the protective cover 19 is located between the two pressure positioning clamps 16. During laser welding, the protective cover 19 can protect the PCB board 2 of the voltage sampling point and the first voltage sampling point connector 4, preventing the laser from damaging the PCB board 2 and the first voltage sampling point connector 4, thus improving the quality of the welding process.

[0063] like Figure 4 and Figure 5 As shown, during operation, the aluminum busbar connector body 1 can be inserted into the receiving groove 111 of the fixture base plate 11 first. Then, the pressure positioning clamp 16 on the positioning clamp mounting base 15 is driven downward by the manual clamp 142 to open the pressure clamp 161 and place the voltage sampling point on the designated position of the aluminum busbar connector body 1. Then, the two pressure clamps 161 press down on the two sides of the aluminum sheet 31 of the voltage sampling point to position it. Next, the protective cover 19 is placed on the outside of the PCB board 2 of the voltage sampling point and the first voltage sampling point connector 4. At this time, the gap between the pressure clamp 161 and the protective cover 19 will expose a local area of ​​the aluminum sheet 31. Finally, the local area can be laser welded by the laser generated by the laser welding machine to fix the aluminum sheet 31 to the aluminum busbar connector body 1.

[0064] In the laser welding process, the laser wavelength of the laser welding machine can be preferably set to 1068nm~1080nm, the laser output power can be preferably set to 1200W~1800W, and the welding speed can be preferably set to 60mm / s~120mm / s. For example... Figure 1 As shown, the welding type of aluminum sheet 31 and aluminum busbar connector body 1 is linear, and the welding connection 7 is linear.

[0065] When connecting, such as Figure 2 and Figure 9As shown, the first voltage sampling point connector 4 on the aluminum busbar connector body 1 can be detachably connected to the second voltage sampling point connector 6 on the voltage sampling flexible circuit board 5. The second voltage sampling point connector 6 is also configured as a plug-in connector, contact connector, or other connectors that are easy to disassemble and match 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; when the first voltage sampling point connector 4 is a female terminal, the second voltage sampling point connector 6 is a male terminal.

[0066] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for preparing an aluminum busbar connector with voltage sampling points, characterized in that, The aluminum busbar connector includes an aluminum busbar connector body for battery connection, a PCB board, a copper-aluminum composite sheet, and a first voltage sampling point connector for detachable connection with a second voltage sampling point connector on a voltage sampling flexible circuit board. The first voltage sampling point connector is soldered to a first surface of the PCB board. The copper-aluminum composite sheet includes an aluminum sheet and a copper sheet with an area smaller than the aluminum sheet. Nickel is electroplated on the second surface of the copper sheet to form a nickel-plated surface. The nickel-plated surface of the copper sheet is soldered to the first surface of the aluminum sheet. The side of the PCB board has several copper solder joints. The solder joints of the PCB board are electrically connected to the pins of the first voltage sampling point connector through lines arranged on the PCB board. The solder joints of the PCB board are soldered to the first surface of the copper sheet, so that the second surface of the PCB board is attached and fixed to the copper sheet. The aluminum sheet is soldered to the aluminum busbar connector body. The method for manufacturing this aluminum busbar connector includes the following steps: (1) Preparation of copper-aluminum composite sheet: nickel is electroplated on the second surface of the copper sheet to form a nickel-plated surface, and then the nickel-plated surface of the copper sheet is welded to the first surface of the aluminum sheet to form a copper-aluminum composite sheet. (2) Soldering the connector to the PCB board: Solder the first voltage sampling point connector to the first surface of the PCB board; (3) Welding of PCB board and copper-aluminum composite sheet: Weld the solder joints of the PCB board processed in step (2) to the first surface of the copper sheet of the copper-aluminum composite sheet, so that the second surface of the PCB board is attached and fixed to the copper sheet to obtain voltage sampling points. (4) Welding of voltage sampling points to aluminum busbar: Weld the aluminum sheet of the copper-aluminum composite sheet processed in step (3) to the aluminum busbar connector body; In step (4), the aluminum sheet is welded to the aluminum busbar connector body by laser welding; The laser welding specifically includes the following steps: (41) Fix the aluminum busbar connector body on the worktable of the laser welding machine by means of the laser welding positioning fixture, and press the two sides of the aluminum sheet of the copper-aluminum composite sheet onto the aluminum busbar connector body by means of the laser welding positioning fixture. (42) The PCB board and the first voltage sampling point connector are covered by a protective cover to protect the PCB board and the first voltage sampling point connector; (43) The aluminum sheet and aluminum busbar connector body are laser welded by the laser output of the laser welding machine, so that the voltage sampling point is welded to the aluminum busbar; The laser welding positioning fixture includes a fixture base plate, a vertical mounting plate, a sliding plate, a sliding plate lifting drive device, a positioning clamp mounting base, and a pressing positioning clamp for pressing the two sides of the aluminum sheet of the copper-aluminum composite sheet onto the aluminum busbar connector body. The vertical mounting plate is mounted on the fixture base plate, the sliding plate is slidably connected to the vertical mounting plate, the sliding plate lifting drive device is mounted on the vertical mounting plate and connected to the sliding plate, and the sliding plate lifting drive device can drive the sliding plate to move up and down. The positioning clamp mounting base is mounted on both sides of the bottom of the sliding plate, and the pressing positioning clamp is mounted on the two positioning clamp mounting bases. The front end of the fixture base plate is provided with a receiving groove for inserting the end of the aluminum busbar connector body. The groove wall can make limiting contact with the end face and side face of the aluminum busbar connector body, and the end face and side face of the aluminum busbar connector body can rest against the groove wall surface of the receiving groove. The sliding plate lifting drive device includes a hand clamp mounting plate and a manual clamp. The manual clamp is mounted on the top of the vertical mounting plate via the hand clamp mounting plate, and the output shaft of the manual clamp is connected to the sliding plate. The pressing and positioning clamp includes pressing jaws, a pin, and a torsion spring. The pressing jaws are pivotally connected to the slot of the positioning clamp mounting base via the pin. The torsion spring is mounted on the pin, and the two elastic arms of the torsion spring abut against the pressing jaws and the positioning clamp mounting base, respectively. The lower end of the pressing jaws is provided with a downward-facing clamping head, which can press against the side of the aluminum sheet. A guide pin and a spring are provided between the positioning clamp mounting base and the bottom of the sliding plate. The upper end of the guide pin passes through the through hole of the positioning clamp mounting base and is fixedly connected to the bottom of the sliding plate. The spring is fitted on the guide pin, and the positioning clamp mounting base can move up and down under the elastic force of the spring. The protective cover is located between the two pressure positioning clamps; During laser welding, the aluminum busbar connector body is first inserted into the receiving groove of the fixture base plate. Then, the pressure positioning clamp on the positioning clamp mounting base is moved downward by the manual clamp to open the pressure clamp jaws. The voltage sampling point, consisting of the PCB board, copper-aluminum composite sheet and the first voltage sampling point connector, is placed in the designated position on the aluminum busbar connector body. Then, the two pressure clamp jaws press down on the two sides of the aluminum sheet of the voltage sampling point to position it. Next, the protective cover is placed over the PCB board and the first voltage sampling point connector of the voltage sampling point, and a local area of ​​the aluminum sheet is exposed in the gap between the pressure clamp jaws and the protective cover. Finally, the laser generated by the laser welding machine is used to perform laser welding on this local area to fix the aluminum sheet to the aluminum busbar connector body.

2. The method for preparing the aluminum busbar connector with voltage sampling points according to claim 1, characterized in that, In step (1), the nickel-plated surface of the copper sheet is welded to the first surface of the aluminum sheet by polymer diffusion welding.

3. The method for preparing the aluminum busbar connector with voltage sampling points according to claim 1, characterized in that, In step (2), the first voltage sampling point connector is soldered to the first surface of the PCB board by SMT reflow soldering; in step (3), the solder joints of the PCB board are soldered to the first surface of the copper sheet by SMT reflow soldering.

4. The method for preparing the aluminum busbar connector with voltage sampling points according to claim 1, characterized in that, During the laser welding process, the laser wavelength of the laser welding machine is set to 1068nm~1080nm, the laser output power is set to 1200W~1800W, the welding speed is set to 60mm / s~120mm / s, and the welding type of the aluminum sheet and aluminum busbar connector body is linear.

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