CN102328175B - Laser welding fixture for square battery module - Google Patents

Abstract

The invention relates to a laser welding fixture for a square battery module. The laser welding fixture comprises a worktable, a pressing mechanism and a supporting mechanism, wherein, the pressing mechanism is fixed on an 'H'-shaped gantry support structure and comprises a pressing frame and a cylinder drive unit; the 'H'-shaped gantry support structure is fixed at two sides of the worktable and comprises an 'H'-shaped gantry support frame and a laser head drive unit; and the worktable comprises an X-Y axis drive unit and a supporting platform. By adopting the structure, the laser welding fixture has the beneficial effects that a connection piece can be tightly contacted with a battery cover plate during the welding process, thus achieving high welding success rate; and in addition, by means of movable arrangement of the worktable, the whole battery module can be completely welded only by one-time setup, thus being simple, convenient and fast in operation.

Description

A square battery module laser welding fixture

technical field

The invention relates to a fixture, in particular to a square battery module laser welding fixture.

Background technique

In the current non-riveting method of assembling lithium-ion batteries into groups, it is necessary to use double-needle spot welding to weld the copper-nickel composite plate to the stainless steel pressure plate of the battery cover. Although the existing double-needle spot welding equipment has low investment cost and simple operation, the welding quality is average, the penetration depth is small, the speed is slow, and the heat generation is large. In addition, with the improvement of the power battery rate performance, the required discharge current is large, and the traditional copper-nickel composite board can no longer meet the needs of the large load current. It must be replaced by a red copper board, and the welding of the red copper board by the double-pin spot welding equipment poor effect. The quality of laser welding is good, the speed is fast, the depth of penetration is large, and the degree of automation is high. However, at present, laser welding of battery modules and copper connection plates can only be done manually, with low efficiency and poor batch stability. There is an urgent need to develop a laser welding fixture specifically for battery modules.

Contents of the invention

The object of the present invention is to provide a fixture for welding a lithium-ion battery module and a connecting piece. It includes a workbench, a pressing mechanism and an "H" type gantry support structure. The pressing mechanism is located on the "H" type gantry support structure, which includes a pressing frame and a cylinder driving device for pressing the connecting piece on the pressing plate of the battery cover. The "H" type gantry support structure is fixed on both sides of the workbench, which includes an "H" type gantry support frame and slide rails. The workbench includes X and Y axis driving devices and a battery module fixing platform.

The present invention solves technical problem and provides following scheme:

A square battery module laser welding fixture, including a workbench, a pressing mechanism and an "H" type gantry support structure, the pressing mechanism is located on the "H" type gantry support structure, which includes a pressing frame and The cylinder driving device and the cylinder driving device fix the platform, and the pressing mechanism is located on the "H" type gantry support structure, which has a pressing frame with a slit in close contact with the connecting piece.

The pressing mechanism also includes a cylinder driving device, which can drive the pressing frame to press on the top of the battery module.

The "H" type gantry support structure is provided with slide rails and limit blocks.

The "H" type gantry support frame 3 is fixed on both sides of the workbench, and it includes an "H" type gantry support frame and a laser head driving device.

The "H" type gantry support structure includes two gantry support frames welded together by supports

Compared with the prior art, the fixture of the present invention adopts a pressing mechanism, which can well ensure the close contact between the connecting piece and the battery cover plate during welding, and has a high welding success rate. In addition, through the active setting of the workbench, the battery module only needs to be set once to complete the welding of the entire module, which is easy and fast to operate.

Description of drawings

Fig. 1 is a schematic diagram of a preferred embodiment of the present invention.

Fig. 2 is an enlarged view of the pressing frame in Fig. 1 .

FIG. 3 is a top view of FIG. 1 .

Fig. 4 is a schematic diagram of Fig. 1 when the battery is loaded.

Fig. 5 is a schematic diagram of Embodiment 2 of the present invention.

Fig. 6a is an enlarged view of the compression frame in Fig. 5 .

Figure 6b is an enlarged view of Figure 6a.

Fig. 7 is a top view of Fig. 5 when the battery is loaded.

Detailed ways

Embodiment one

Please refer to FIG. 1 , which is a preferred embodiment of the present invention, which is applicable to a fiber output laser. The fixture for welding the battery pack and the connecting piece mainly includes a workbench 1, a pressing mechanism 2 and an "H" type gantry support structure 3.

The pressing mechanism is fixed on the "H" type gantry support structure 3, which includes a pressing frame 4 and a cylinder driving device 5. The pressing frame 4 is a steel structure with a slit 6 (please refer to Fig. 2). Both ends of the pressing frame 4 are respectively connected with the piston rod 17 of the cylinder driving device 5 . The bottom surface of the compression frame 4 has a rubber block 7 containing a slit 6 (please refer to FIG. 2 ).

The "H" type gantry support frame 3 is fixed on both sides of the workbench 1, and it includes an "H" type gantry support frame 8 and a laser head driving device 9, and the driving device 9 is composed of a driving motor 10 and a second screw 11. The driving motor 10 rotates the second screw 11 for driving the laser head 13 to move (please refer to FIGS. 3 and 4 ).

The workbench includes X and Y-axis driving devices 18 and a supporting platform 14 . The first screw 20 is rotated by the driving motor 19 to drive the supporting platform 14 to move.

Please refer to Fig. 4, when carrying out the laser welding of lithium-ion battery module 15 and connecting piece 16, first, start X, Y-axis driving device 18 to drive support platform 14, make battery module 15 and connecting piece 16 move to corresponding position ; Next, start the cylinder 5, push the piston rod 17 to drive the compression frame 4 to compress the connecting piece 16 on the top of the battery 15; start the laser, make the laser pass through the slit 6 and shoot at the connecting piece 16, and at the same time, start the laser The head driving device 9 drives the laser head 13 to move, and after the laser moves to a predetermined position along the direction of the slit 6, the laser is stopped. Stop the work of the cylinder 5, make the piston rod 17 drive the compression frame 4 to break away from the connecting piece 16, and then start the X, Y axis driving device 18 to drive the supporting platform 14, so that the battery module 15 and the connecting piece 16 are moved to the corresponding positions, and the next time is started. Welding, during laser welding this time, the laser head driving device 9 drives the laser head 13 to move in the opposite direction from last time, and drives the laser head 13 to return to the initial position.

Embodiment two

Please refer to Figs. 5-7, this embodiment is applicable to a fixed optical path output laser. The fixture for welding the battery pack and the connecting piece mainly includes a workbench 1, a pressing mechanism 2 and an "H" type gantry support structure 3.

The pressing mechanism is fixed on the "H" type gantry support structure 3, which includes a pressing frame 30 (please refer to FIG. 6 ) and an air cylinder driving device 5 . The pressing frame 30 is a steel structure with a slit 6 . Both ends of the pressing frame 30 are respectively connected with the piston rod 17 of the cylinder driving device 5 . A rubber block 7 containing a slit 6 is arranged on the bottom surface of the pressing frame 30 .

The "H" type gantry support frame is fixed on both sides of the workbench 1, and it includes an "H" type gantry support frame 21 and a pressing mechanism slide rail 22. A limit block 23 is fixed on the "H" type gantry support frame 21, which is used to limit the sliding range of the slide rail 22 of the pressing mechanism. The pressing mechanism slide rail 22 includes an "L" cylinder bracket 24 and a slide rail 25 .

The workbench includes X and Y-axis driving devices 18 and a supporting platform 14 . The first screw 20 is rotated by the driving motor 19 to drive the supporting platform 14 to move.

When performing laser welding of the lithium-ion battery module 15 and the connecting piece 16, first, start the X, Y-axis driving device 18 to drive the support platform 14, so that the battery module 15 and the connecting piece 16 are moved to the corresponding positions; next, start Cylinder 5, push the piston rod 17 to drive the compression frame 30 to press the connecting piece 16 on the top of the battery 15; start the laser, make the laser pass through the slit 6 and shoot on the connecting piece 16, at the same time, start the X-axis driving device of the workbench 18 drives the support platform 14, the battery module 15, and the connecting piece 16 to move, and at the same time, under the action of friction, the battery module 15, the connecting piece 16 drives the pressing mechanism 2, and the "L" cylinder bracket 24 moves along the slide rail 25 ,, After the laser is moved to the predetermined position along the slit 6, the laser is stopped, and the pressing mechanism 2 and the "L" cylinder support 24 also stop moving. Stop the work of the cylinder 5, make the piston rod 17 drive the compression frame 4 to break away from the connecting piece 16, and then start the X, Y axis driving device 18 to drive the supporting platform 14, so that the battery module 15 and the connecting piece 16 are moved to the corresponding positions, and the next time is started. Welding, during laser welding this time, the X-axis driving device 18 of the workbench drives the support platform 14, the battery module 15, the connecting piece 16 and the pressing mechanism 2, and the "L" cylinder bracket 24 is along the slide rail 25 and is opposite to the last time Direction movement drives the pressing mechanism 2 back to the initial position.

Since the fixture of the present invention adopts a compression structure, the close contact between the connecting piece and the battery module is ensured, thereby ensuring the effect of laser welding. Combined with the automatic control program of the laser, the welding of each battery module only needs to control the initial position, and once set, the welding of the entire group of modules can be completed, saving time and efficiency.

Claims (1)

1. a laser welding fixture for square battery module, comprise workbench, hold-down mechanism and " H " type gantry supporting structure, described hold-down mechanism is positioned on " H " type gantry supporting structure, it comprises a clamping frame and cylinder driver and cylinder driver fixed platform, it is characterized in that: " H " type gantry supporting structure is by a left side, right two bracing frames and be connected to a left side, crossbeam between right two bracing frames is formed, described hold-down mechanism is positioned on " H " type gantry supporting structure, it has the clamping frame with brace close contact, described clamping frame upper, lower two surfaces are provided with slit, there is the block rubber containing slit described clamping frame bottom surface, described hold-down mechanism also comprises cylinder driver, the two ends of clamping frame are connected with the piston rod of cylinder driver respectively, described piston rod controls clamping frame in the vertical direction, lower movement, and described cylinder driver drives clamping frame to be pressed on battery modules top, described " H " type gantry supporting structure is provided with slide rail and limited block, described " H " type gantry supporting structure is fixed on the both sides of workbench, it comprises " H " type gantry bracing frame and laser head drive unit, described workbench comprises X, Y-axis Working table driving device and support platform, by table drive motor, the first screw rod is rotated for driving support platform to move, laser head drive unit is made up of laser head drive motors and the second screw rod, and laser head can be movable on clamping frame along slit.