A string welding machine and method for preventing welding strip from twisting

Abstract

The present invention provides a welding machine for preventing welding strips from twisting. The welding machine is provided with a device for preventing welding strips from twisting on the transmission path of the welding strips before the welding station of the welding machine. The device for preventing welding strips from twisting is used to clamp the flat section of the welding strips, and release the flat section after the flat section of the welding strips is corrected to a position parallel to the battery cell. In addition, the present invention also proposes a method for preventing welding strips from twisting, the purpose of which is to correct the welding strips before welding the welding strips to the battery cell to improve the welding quality of the battery string.

Description

Technical Field

[0001] The present invention relates to a device for controlling a soldering strip, and further to a device for preventing the soldering strip from twisting, and in particular to a string soldering machine for preventing the soldering strip from twisting. The present invention also relates to a method for preventing the soldering strip from twisting implemented by using the string soldering machine. Background Art

[0002] At present, the module market uses a large number of dense-grid solar cells and their various slices. The conductive ribbons interconnected with the dense-grid solar cells and their various slices are generally round solder ribbons, triangular solder ribbons, or special-shaped solder ribbons. In order to prevent the connection section between the cells from producing cell cracks after the lamination process, the conductive ribbons of the connection section between the cells are generally prepared into a flat shape. Because the main grid lines of the dense-grid solar cells are dense and thin, the interconnected conductive ribbons used are also very thin, only 0.3mm to 0.45mm. The solder ribbons are generally supplied in a whole roll, which requires the use of an automated ribbon supply mechanism and a cloth belt. After the preparation of the mechanism and the tape cutting mechanism, they are then aligned one by one with the main grid lines of the solar cell, and then interconnected and welded. In this way, during the whole process of arranging the welding tape with the main grid lines of the solar cell, the welding tape is clamped and controlled by the robot. Therefore, in a series of preparation and arrangement of the welding tape on the main grid lines of the solar cell, there is a situation where the flat section of the welding tape is flipped and twisted. In this way, after the welding tape is interconnected and welded with the battery cell, the flat welding tape of the connecting section between the battery cell and the battery cell may be in a flipped state. In this way, in the lamination process, the connecting section between the battery cell and the battery cell may still cause hidden cracks in the battery cell due to the unevenness of the welding tape. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a string welding machine for preventing a welding strip from twisting and a method for preventing a welding strip from twisting.

[0004] Among them, the welding ribbon used on the string welding machine can be a special-shaped welding ribbon with a flat section, a round welding ribbon with a flattened section, or a welding ribbon that is a whole flat ribbon.

[0005] Before the welding station of the stringer, a device is provided on the transmission path of the soldering ribbon to prevent the soldering ribbon from twisting; the device is used to clamp the flat section of the soldering ribbon, and release the flat section after the flat section of the soldering ribbon is corrected to a position parallel to the battery cell.

[0006] Furthermore, the device for preventing the welding strip from twisting comprises at least: a correction mechanism for holding the flat section of the welding strip; a lifting mechanism arranged on the upper part of the correction mechanism, for driving the correction mechanism to correct the welding strip; a fixing seat for installing the correction mechanism and the lifting mechanism; wherein, when the correction mechanism is corrected, a clamping hole is formed that only allows the flat section of the welding strip to pass through, and the shape of the clamping hole is similar to the shape of the cross section of the flat section of the welding strip, and the width and height of the clamping hole are slightly larger than the width and thickness of the flat section of the welding strip. The fixing seat is also fixedly connected to the body of the stringer at an appropriate position.

[0007] Furthermore, the correction mechanism is composed of a plurality of clamp mechanisms arranged side by side on the corresponding welding strip transmission path and a rectangular clamp seat for installing the clamp mechanisms.

[0008] Furthermore, the lower parts of the left and right clamps on the clamp mechanism are provided with left and right solder strip clamping slots with openings facing each other, respectively, on the clamping claws for clamping the solder strip. The left and right solder strip clamping slots together surround a clamping hole for correcting the solder strip when the clamping claws are staggered and closed.

[0009] Furthermore, the middle parts of the left clamp and the right clamp are respectively hinged to the clamp seat through a hinge shaft, and the upper part of the hinge shaft is also provided with a compression spring that contacts the inner sides of the left and right clamps.

[0010] Furthermore, a limit platform is provided below the clamp seat and between the left and right clamps to prevent the welding strip from being damaged. When the left and right clamps hit the limit platform during the closing process, they cannot get close to each other. The clamping hole formed at this time is a clamping hole that only allows the flat section of the welding strip to pass through.

[0011] Furthermore, the lifting mechanism includes: an opening and closing plate with a plurality of sliding grooves and a lifting assembly driving the opening and closing plate to reciprocate up and down, wherein each sliding groove on the opening and closing plate is correspondingly sleeved on the outer side of the upper handle of each set of clamp mechanisms, and the opening and closing angle M of the upper handle is controlled by the up and down reciprocating motion, so as to drive the left and right calipers to open and close with the hinge shaft as the fulcrum. When the opening and closing plate is in the lower position, the opening and closing angle M must be greater than 0.

[0012] Furthermore, in order to prevent the inner wall of the sliding groove from contacting the clamp, the opening of the sliding groove is smaller than the width of the interior of the groove, ensuring that when the opening and closing plate reciprocates up and down, the clamp mechanism can only slide in contact with the opening of the sliding groove.

[0013] The present invention also proposes a method for preventing the welding strip from twisting; the specific steps are as follows:

[0014] Step 1: Arrange a device on the path of the soldering ribbon transmission to prevent the soldering ribbon from twisting;

[0015] Step 2: Before the welding ribbon and the battery cell are welded into a string, a device for preventing the welding ribbon from twisting is used to clamp the flat section of the welding ribbon, and the flat section of the welding ribbon is corrected to a position parallel to the battery cell;

[0016] Step 3: Release the straightened solder ribbon and ensure that the flat section of the solder ribbon is parallel to the surface of the battery cell during soldering.

[0017] Except for the flat strip, the flat sections of the welding strip appear periodically in the length direction of the welding strip. Before welding, the strip pulling mechanism pulls the welding strip so that the flat section of the welding strip stays briefly in the position of the device to prevent the welding strip from twisting so as to correct it.

[0018] The technical effect of the present invention is that: during the transmission of the welding strip on the string welding machine, a device for preventing the welding strip from twisting is provided, and before the welding strip is welded to the battery cell, the flat section of the welding strip passes through the correction mechanism on the device for preventing the welding strip from twisting, and the correction mechanism is used to clamp the claws of the left and right clamps of the welding strip close to each other, forming a clamping hole similar to the cross-sectional shape of the flat section of the welding strip, so that the welding strip cannot be turned over or twisted in the clamping hole; for those welding strips that have been twisted before correction, since the width and height of the clamping hole gradually decrease in the process of the clamping claws of the flat section of the welding strip approaching each other, the shape of the clamping hole gradually adapts to the cross-sectional shape of the welding strip, and the flat section of the welding strip will be twisted again to a position parallel to the battery cell. At the same time, the correction process will also release a part of the internal stress generated by the welding strip after the twisting deformation, so that the flat section of the welding strip and the battery cell are more closely attached, avoiding the uneven welding strip and the battery cell from being welded together, and preventing the battery cell from being squeezed by the uneven welding strip during the subsequent lamination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric diagram of a device for preventing the welding strip from twisting in an embodiment;

[0020] Figure 2 is a top view of the positional relationship between the clamp mechanism and the welding strip in the embodiment;

[0021] Figure 3 is a cross-sectional view of a clamp mechanism in an embodiment;

[0022] Figure 4 is a partial enlarged view of the clamp mechanism when the jaws are closed in the embodiment;

[0023] Figure 5 is a front view of the clamp mechanism in the embodiment;

[0024] Figure 6 is a partial enlarged view of the clamp mechanism when the jaws are open in the embodiment;

[0025] Figure 7This is a front view of the assembly relationship between the clamp mechanism and the opening and closing template in the embodiment;

[0026] Figure 8 It is a front view of the assembly relationship between the clamp mechanism, the opening and closing plate and the clamp seat in the embodiment;

[0027] Fig. 9 This is the first implementation method of the lifting mechanism in the embodiment;

[0028] Fig.10 This is the second implementation method of the lifting mechanism in the embodiment;

[0029] Fig.11 This is the third implementation method of the lifting mechanism in the embodiment;

[0030] In the figure, 10. return mechanism, 11. fixed seat, 12. lifting mechanism, 13. opening and closing plate, 14. clamp seat, 15. clamp mechanism, 101. flat section, 131. sliding groove, 141. limit platform, 143. compression spring, 144. hinge shaft, 151. left clamp, 152. right clamp, 153. clamping hole, 200. battery cell, 1511. left solder strip clamping slot, 1512. right solder strip clamping slot, 121. lifting assembly. DETAILED DESCRIPTION

[0031] Combine the following Figures 1 to 11 Embodiments of the present invention will be described in detail.

[0032] Figure 1 The structure of the device for preventing the welding strip from twisting on the stringer is illustrated, and the device includes: a correction mechanism 10 for holding the flat section 101 of the welding strip; a lifting mechanism 12 arranged on the upper part of the correction mechanism 10, for driving the correction mechanism 10 to correct the welding strip; a fixing seat 11 for installing the correction mechanism 10 and the lifting mechanism 12; wherein, when the correction mechanism 10 is corrected, a clamping hole 153 is formed that only allows the flat section 101 of the welding strip to pass through, and the shape of the clamping hole 153 is similar to the cross-sectional shape of the welding strip flat section 101, and the width and height of the clamping hole 153 are slightly larger than the width and thickness of the welding strip flat section 101. The welding strip flat section 101 can only move along the transmission direction in the clamping hole 153, so the twisted welding strip flat section 101, after being restricted by the clamping hole, returns to a state parallel to the battery cell.

[0033] Figure 2 The diagram shows the state of the flat section 101 of the soldering ribbon when it passes through the clamping mechanism 15 . When the soldering ribbon is being transmitted, the flat section 101 of the soldering ribbon needs to be temporarily stopped at the clamping mechanism 15 before correction.

[0034] Figure 3 and Figure 4The diagram shows the state when the left clamp 151 and the right clamp 152 on the clamp mechanism 15 hold the flat section 101 of the solder strip. The left clamp 151 and the right clamp 152 on the clamp mechanism 15 are provided with a left solder strip clamping groove 1511 and a right solder strip clamping groove 1512 with openings facing each other, respectively. When the clamping claws are staggered and closed, the left solder strip clamping groove 1511 and the right solder strip clamping groove 1512 jointly surround a clamping hole 153 for correcting the solder strip.

[0035] Figures 5 and 6 The diagram shows the state in which the solder strip passes through the clamp mechanism 15 when the left clamp 151 and the right clamp 152 on the clamp mechanism 15 are opened. When the clamp hole 153 is formed, the clamp claws of the left clamp 151 and the right clamp 152 are partially overlapped in the direction of solder strip transmission.

[0036] Figure 8 and Fig. 9 The diagram illustrates the assembly relationship between the correction mechanism 10 and the opening and closing template 13. The correction mechanism 10 is composed of a plurality of clamp mechanisms 15 arranged side by side on the corresponding welding strip transmission path and a rectangular clamp seat 14 for installing the clamp mechanism 15; the middle parts of the left clamp 151 and the right clamp 152 are respectively hinged to the clamp seat 14 through a hinge shaft 144, and the upper part of the hinge shaft 144 is also provided with a compression spring 143 that contacts the inner sides of the left and right clamps; the opening and closing template 13 is provided with sliding grooves 131 with the same number as the clamp mechanism 15, and the sliding grooves 131 are sleeved on the outer side of the upper end handle of the clamp mechanism 15.

[0037] When the opening and closing plate 13 is driven upward by the lifting mechanism 12, the left and right clamps, under the action of the opening of the sliding groove 131, make the angle M formed by the outer sides of the upper handles of the left and right clamps smaller, and the clamp mechanism 15 will gradually open to release the flat section 101 of the welding strip; when the opening and closing plate 13 is driven downward by the lifting mechanism 12, the left and right clamps, under the action of the compression spring 143, make the angle M formed by the outer sides of the upper handles of the left and right clamps larger, and the clamp mechanism 15 will gradually close to hold the flat section 101 of the welding strip until the left and right clamps contact with the limit block 141, and finally form the clamping hole 153.

[0038] Among them, the limit platform 141 can accurately control the size of the clamping hole 153. Even if the lifting mechanism 12 drives the opening and closing plate 13 to move upward too far, it can ensure that the left and right clamps will not excessively clamp the welding strip under the action of the compression spring 143, thereby avoiding the welding point from being clamped.

[0039] The opening of the sliding groove 131 is smaller than the width of the groove, ensuring that when the opening and closing plate 13 reciprocates up and down, the clamp mechanism 15 can only slide in contact with the opening of the sliding groove 131, and the inner wall of the sliding groove 131 cannot touch the clamp during the movement.

[0040] Figures 9 to 11 The three most common implementations of the lifting mechanism 12 are shown in FIG. 1 , which mainly include: a pneumatic mechanism, a crank connecting rod guide mechanism, and a screw guide mechanism. All three mechanisms can drive the opening and closing template 13 to perform up and down reciprocating motion.

[0041] Working principle: the return mechanism 10 and the lifting mechanism 12 are respectively installed on the fixed seat 11. When the welding ribbon is transmitted forward, the opening and closing plate 13 on the lifting mechanism 12 is in the upper position, and the claw ends of the left and right clamps are in the open state. At this time, the welding ribbon will not be restricted in any way and can pass smoothly through the gap between the left welding ribbon slot 1511 and the right welding ribbon slot 1512;

[0042] Before the welding ribbon is welded to the battery cell, its flat section 101 stays at the clamping mechanism 15; the lifting mechanism 12 drives the opening and closing plate 13 to move downward, and the angle M between the outer sides of the upper handles of the left clamp 151 and the right clamp 152 gradually increases under the action of the compression spring, and the claws at the bottom of the clamping mechanism 15 approach each other. When the left and right clamps contact with the limit block 141, the clamping hole 153 formed by the left welding ribbon slot 1511 and the right welding ribbon slot 1512 limits the flat section 101 of the welding ribbon to a position parallel to the battery cell, completing a correction action on the welding ribbon to ensure that the corrected flat section 101 of the welding ribbon is tightly fitted to the battery cell during welding.

[0043] After correction, the lifting mechanism 12 drives the opening and closing plate 13 to move upward, the angle M between the outer sides of the upper handles of the left caliper 151 and the right caliper 152 gradually becomes smaller, and the claws at the lower part of the clamping mechanism 15 move away from each other. At this time, the welding ribbon can continue to pass smoothly through the gap between the left welding ribbon slot 1511 and the right welding ribbon slot 1512.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A string welding machine for preventing a welding strip from twisting, characterized in that: Before the welding station of the stringer, a device is provided on the transmission path of the welding ribbon to prevent the welding ribbon from twisting; The device for preventing the welding strip from twisting is used to clamp the flat section (101) of the welding strip, and release the flat section (101) after the flat section (101) of the welding strip is corrected to a position parallel to the battery cell (200); The device for preventing the welding strip from twisting comprises at least: A return mechanism (10) for holding the flat section (101) of the welding strip; A lifting mechanism (12) disposed on the upper part of the correcting mechanism (10), used for driving the correcting mechanism (10) to correct the welding strip; A fixing seat (11) for mounting the correction mechanism (10) and the lifting mechanism (12); When the correction mechanism (10) is corrected, a clamping hole (153) is formed that only allows the flat section (101) of the welding strip to pass through; the shape of the clamping hole (153) is similar to the cross-sectional shape of the welding strip flat section (101); the width and height of the clamping hole (153) are slightly greater than the width and thickness of the welding strip flat section (101).

2. The stringer for preventing the welding strip from twisting according to claim 1, characterized in that: The correction mechanism (10) is composed of a plurality of clamp mechanisms (15) arranged side by side on corresponding welding strip transmission paths and a rectangular clamp seat (14) for mounting the clamp mechanisms (15).

3. The stringer for preventing the welding strip from twisting according to claim 2, characterized in that: The left and right clamps (151 and 152) on the clamp mechanism (15) are provided with claws at the bottom for clamping the welding strip, respectively, and the left and right welding strip clamping grooves (1511 and 1512) are opened towards each other. When the claws are closed in an interlaced manner, the left and right welding strip clamping grooves (1511 and 1512) are surrounded together to form a clamping hole (153) for correcting the welding strip.

4. The stringer for preventing the welding strip from twisting according to claim 3 is characterized in that: The middle parts of the left clamp (151) and the right clamp (152) are respectively hinged to the clamp seat (14) via a hinge shaft (144), and the upper part of the hinge shaft (144) is also provided with a compression spring (143) that contacts the inner sides of the left and right clamps.

5. The stringer for preventing the welding strip from twisting according to claim 4, characterized in that: Below the clamp seat (14), between the left and right clamps, a limit platform (141) is provided for preventing the welding strip from being damaged.

6. The stringer for preventing the welding strip from twisting according to claim 1, characterized in that: The lifting mechanism (12) comprises: an opening and closing plate (13) provided with a plurality of sliding grooves (131) and a lifting assembly (121) for driving the opening and closing plate (13) to perform up and down reciprocating motion, wherein each sliding groove (131) on the opening and closing plate (13) is correspondingly sleeved on the outer side of the upper handle of each group of clamp mechanisms (15), and the opening and closing angle M of the upper handle is controlled by the up and down reciprocating motion, so as to drive the left and right clamps to perform opening and closing motion with the hinge shaft (144) as the fulcrum.

7. The stringer for preventing the welding strip from twisting according to claim 6, characterized in that: The size of the opening of the sliding groove (131) is smaller than the width of the interior of the groove, ensuring that when the opening and closing plate (13) reciprocates up and down, the clamping mechanism (15) can only slide in contact with the opening of the sliding groove (131).

8. A method for preventing a welding strip from twisting, using the welding machine for preventing a welding strip from twisting according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Arrange a device on the path of the solder ribbon transmission to prevent the solder ribbon from twisting; Step 2: before the welding ribbon and the battery cell are welded into a string, a device for preventing the welding ribbon from twisting is used to clamp the flat section (101) of the welding ribbon, and the flat section (101) of the welding ribbon is corrected to a position parallel to the battery cell; Step 3: Release the straightened solder ribbon, and ensure that the flat section (101) of the solder ribbon is parallel to the surface of the battery cell during soldering.

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