A multi-busbar series connection device with multiple wirings and a method for connecting battery strings in series

Abstract

The present invention relates to a multi-busbar series connection device with multiple wirings and a method for connecting battery strings in series. The multi-busbar series connection device with multiple wirings includes a series connection workbench and a busbar line wiring mechanism. The busbar line wiring mechanism is used to wire busbar lines in a first direction. It also includes a movable wiring preparation table, an auxiliary line wiring mechanism and an auxiliary line connection mechanism. The movable wiring preparation table can be moved along a second direction perpendicular to the first direction under the drive of a driving mechanism. The method for connecting battery strings in series uses the multi-busbar series connection device with multiple wirings mentioned above for series connection. The present invention has a simple structure and is easy to operate. It transforms existing equipment, adds a movable wiring preparation table, and the moving direction of the movable wiring preparation table is set perpendicular to the busbar line wiring direction. By moving the movable wiring preparation table and using multiple wiring technology, the multi-busbar series connection device can be manufactured, which has good compatibility, reduces production costs, and expands the scope of use.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, in particular to a multi-busbar series connection device with multiple wirings and a method for connecting battery strings in series. Background Art

[0002] In recent years, the photovoltaic industry has developed rapidly, the photovoltaic market capacity has continued to expand, and photovoltaic technology innovations have emerged in an endless stream. The size of photovoltaic cells has rapidly transitioned from 125mm to 158mm, 162mm, 166mm, and 210 / 182mm. The number of main grid lines of photovoltaic cells has rapidly transitioned from 2 main grids (2BB) to 3BB, 4BB, 5BB, 6BB, 9BB, 12BB, and 18BB. On the one hand, technological progress has brought a huge driving force for cost reduction and efficiency improvement in the photovoltaic industry; on the other hand, technological progress has also brought about the rapid elimination of photovoltaic manufacturing equipment. 90% of the value of manufacturing equipment may disappear within 3 years, and it is impossible to achieve the ideal state of one-time investment and long-term return. Especially after the emergence of 210 large silicon wafers, it is expected that multi-busbar technology will be further expanded to about 24. In order to reduce the consumption of precious metal Ag paste, the number of main grid copper strips may increase further in the future.

[0003] Common string welding equipment at present Figure 1a and Figure 1b As shown, the main grid lines 205 are arranged in an orderly manner at equal intervals on the main grid line wiring end 203, and the main grid line traction clamp 206 clamps one end of the main grid line 205, pulls the main grid line 205 out from the main grid line wiring end 203, and wires it on the wiring preparation platform 102, and then moves it to the string welding workbench 101. The main grid line 205 is cut off at the outlet end 204 of the main grid line wiring end 203 and falls into the limiting grooves of the wiring preparation platform 102 and the string welding workbench 101. The wiring preparation platform 102 and the string welding workbench 101 are an integral structure. The number of limiting grooves of the wiring preparation platform 102 and the string welding workbench 101 is consistent with the number of main grid line wiring.

[0004] In the existing equipment, there are as many main grid line traction clamps 206 as there are outlet terminals 204. If the baseline is set to 9BB, and you want to change it to 18BB or other main grid lines, it means that the string welding equipment needs to be fully modified. Not only does it need to change the wire feeding mechanism (from 9 to 18), the number of wire feeding wheels (9 to 18), the traction mechanism (9 to 18 traction clamps), and the corresponding settings of the string welding workbench 101 (such as preheating position, etc.), the modification is very cumbersome. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a multi-busbar series connection device with multiple wirings and a method for connecting battery strings in series.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a multi-busbar series connection device with multiple wirings, comprising a series connection workbench and a busbar line wiring mechanism, the busbar line wiring mechanism is used to wire the busbar lines in a first direction, and the multi-busbar series connection device with multiple wirings also comprises a movable wiring preparation table, an auxiliary line wiring mechanism and an auxiliary line connection mechanism;

[0007] The movable wiring preparation platform can be moved along a second direction perpendicular to the first direction under the drive of the driving mechanism, so as to make the groups of main grid lines that are wired by the main grid wiring mechanism to the movable wiring preparation platform be staggered by a certain distance;

[0008] An auxiliary line wiring mechanism is used to wire auxiliary lines that intersect with each main grid line to a movable wiring preparation table, wherein at least one auxiliary line is located in front of the main grid line on the movable series connection preparation table;

[0009] The auxiliary line connection mechanism is used to connect the auxiliary lines on the movable wiring preparation table with the main grid lines.

[0010] Furthermore, the main gate line wiring mechanism includes a main gate line wiring end, a main gate line traction mechanism and a main gate line cutting mechanism. The main gate line traction mechanism is used to pull the main gate line from the main gate line wiring end to the movable wiring preparation table and the series workbench in sequence, and the main gate line cutting mechanism is used to cut the main gate line at the outlet end of the main gate line wiring end.

[0011] Furthermore, the auxiliary wire wiring mechanism includes an auxiliary wire wiring end, an auxiliary wire traction mechanism and an auxiliary wire cutting mechanism. The auxiliary wire traction mechanism is used to pull the auxiliary wire from the auxiliary wire wiring end to the movable wiring preparation table, and the auxiliary wire cutting mechanism is used to cut the auxiliary wire at the outlet end of the auxiliary wire wiring end.

[0012] Furthermore, the auxiliary line wiring mechanism also includes an auxiliary line direction-changing mechanism for changing the direction of the auxiliary line, which is used for changing the direction when the auxiliary line wiring direction is inconsistent with the auxiliary line transmission direction, and is specifically a steering wheel.

[0013] Furthermore, the series workbench is provided with a main grid limiting groove, and the movable wiring preparation table is provided with a preparation limiting groove and an auxiliary line limiting groove intersecting with the preparation limiting groove, the main grid limiting groove and the preparation limiting groove limit the main grid line respectively, and the auxiliary line limiting groove limits the auxiliary line.

[0014] Furthermore, n1 main grid lines are arranged on the main grid line wiring end, and the distance between two adjacent main grid lines is a, and the number of main grid limiting grooves and preparation limiting grooves is n times of n1, and n≥2;

[0015] The movable wiring preparation table moves a / n distance in a single movement along the second direction.

[0016] Furthermore, the auxiliary line connection mechanism connects the auxiliary line and the main grid line into a whole by welding or bonding, and the auxiliary line connection mechanism is an auxiliary line welding mechanism or an auxiliary line bonding mechanism.

[0017] Furthermore, the auxiliary wire welding mechanism is an auxiliary wire welding mechanism that adopts heating pressure welding, hot air welding, infrared heating welding, induction heating welding, ultrasonic welding, resistance welding or laser welding.

[0018] Furthermore, a movable main grid lifting mechanism is provided below the serial connection workbench, and an auxiliary line lifting mechanism is provided below the movable wiring preparation table.

[0019] A method for connecting battery strings in series, using the above-mentioned multi-busbar series connection device with multiple wiring, specifically comprises the following steps:

[0020] S1, the busbar wiring mechanism pulls the required number of busbar wirings to the movable wiring preparation table through multiple wirings, and the movable wiring preparation table moves along the second direction so that the groups of busbars that are wired to the movable wiring preparation table are staggered by a certain distance from each other;

[0021] S2, after the main grid line wiring mechanism completes the last wiring, the last group of main grid lines are still held in a clamped state, the auxiliary line wiring mechanism performs wiring of the auxiliary lines, and after the auxiliary line wiring is completed, the auxiliary lines are connected to the main grid lines as a whole through the auxiliary line connecting mechanism;

[0022] S3, the main grid wiring mechanism continues to maintain the clamping state of the last group of main grid lines, and the main grid wiring mechanism continues to move along the first direction to move all the main grid lines on the movable wiring preparation table to the photovoltaic cells on the serial connection workbench to perform wiring and serial connection of the photovoltaic cells.

[0023] Furthermore, the S1 specifically includes the following steps:

[0024] S1-1, the movable wiring preparation table moves along the second direction, a part of the movable wiring preparation table prepares a limit groove corresponding to the wiring position of the main grid wiring end, and the main grid line pulling mechanism pulls the main grid line from the main grid wiring end to the movable wiring preparation table along the pulling movement direction;

[0025] S1-2, the main grid line cutting mechanism cuts off the main grid line at the outlet end of the main grid line wiring end, the main grid line pulling mechanism is released, and the main grid line falls into the movable wiring preparation table;

[0026] S1-3, repeat the operations of S1-1 and S1-2 until the required number of main grid lines are laid on the movable wiring preparation table.

[0027] The beneficial effects of the present invention are as follows: the present invention has a simple structure, transforms existing equipment, adds a movable wiring preparation table, and the moving direction of the movable wiring preparation table is set perpendicular to the main grid line wiring direction. By moving the movable wiring preparation table and using multiple wiring technology, the serial equipment of multiple main grids can be upgraded and manufactured, which has good compatibility, reduces production costs, and expands the scope of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1a It is a schematic diagram of the structure of the first working state in the prior art;

[0030] Figure 1b It is a schematic diagram of the structure of the second working state in the prior art;

[0031] Figure 2a This is a schematic diagram of the structure of the first working state of Example 1;

[0032] Figure 2b This is a schematic diagram of the structure of the second working state of Example 1;

[0033] Figure 2c This is a schematic diagram of the structure of the third working state of Example 1;

[0034] Figure 2d This is a schematic diagram of the structure of the fourth working state of Example 1;

[0035] Figure 2e This is a schematic diagram of the structure of the fifth working state of Example 1;

[0036] Figure 3 It is a structural diagram of the auxiliary line wiring mechanism.

[0037] Among them, 101. string welding workbench, 102. wiring preparation table, 201. series connection workbench, 202. movable wiring preparation table, 203. main grid wiring end, 204. outlet end, 205. main grid line, 206. main grid line traction clamp, 207. main grid limit groove, 208. auxiliary line, 209. preparation limit groove, 210. main grid line cutting mechanism, 303. steering wheel, 304. auxiliary line clamping mechanism, 305. auxiliary line cutting mechanism, 309. auxiliary line traction clamp, 310. hot pressing strip, 311. auxiliary line lifting mechanism. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] A multi-busbar series connection device with multiple wirings includes a series connection workbench and a busbar line wiring mechanism, wherein the busbar line wiring mechanism is used to wire busbar lines in a first direction, and the multi-busbar series connection device with multiple wirings also includes a movable wiring preparation table, an auxiliary line wiring mechanism, and an auxiliary line connection mechanism;

[0040] The movable wiring preparation platform can be moved along a second direction perpendicular to the first direction under the drive of the driving mechanism, so as to make the groups of main grid lines that are wired by the main grid wiring mechanism to the movable wiring preparation platform be staggered by a certain distance;

[0041] An auxiliary line wiring mechanism is used to wire auxiliary lines that intersect with each main grid line to a movable wiring preparation table, wherein at least one auxiliary line is located in front of the main grid line on the movable series connection preparation table;

[0042] The auxiliary line connection mechanism is used to connect the auxiliary lines on the movable wiring preparation table with the main grid lines.

[0043] The main grid line wiring mechanism includes a main grid line wiring end, a main grid line pulling mechanism and a main grid line cutting mechanism. The main grid line pulling mechanism is used to pull the main grid line from the main grid line wiring end to the movable wiring preparation table and the series workbench in sequence. The main grid line cutting mechanism is used to cut the main grid line at the outlet end of the main grid line wiring end.

[0044] The auxiliary wire wiring mechanism includes an auxiliary wire wiring end, an auxiliary wire traction mechanism and an auxiliary wire cutting mechanism. The auxiliary wire traction mechanism is used to pull the auxiliary wire from the auxiliary wire wiring end to the movable wiring preparation table, and the auxiliary wire cutting mechanism is used to cut the auxiliary wire at the outlet end of the auxiliary wire wiring end.

[0045] The auxiliary line wiring mechanism also includes a steering wheel for changing the direction of the auxiliary line.

[0046] The serial workbench is provided with a main grid limiting groove, and the movable wiring preparation table is provided with a preparation limiting groove and an auxiliary line limiting groove intersecting with the preparation limiting groove. The main grid limiting groove and the preparation limiting groove limit the main grid line respectively, and the auxiliary line limiting groove limits the auxiliary line.

[0047] The main grid wiring end is used to lead out n1 main grid lines, and the distance between two adjacent main grid lines is a. The number of main grid limiting grooves and preparation limiting grooves is n times of n1, and n≥2;

[0048] The movable wiring preparation table moves a / n distance in a single movement along the second direction.

[0049] The auxiliary line connection mechanism connects the auxiliary line and the main grid line into a whole by welding or bonding. The auxiliary line connection mechanism is an auxiliary line welding mechanism or an auxiliary line bonding mechanism.

[0050] The auxiliary line welding mechanism is an auxiliary line welding mechanism that adopts heating pressure welding, hot air welding, infrared heating welding, induction heating welding, ultrasonic welding, resistance welding or laser welding.

[0051] An auxiliary wire lifting mechanism is provided below the movable wiring preparation table, and the auxiliary wire lifting mechanism is used for lifting the auxiliary wire located in the auxiliary wire limiting groove.

[0052] A movable main grid lifting mechanism is provided under the serial workbench. The movable main grid lifting mechanism under the serial workbench is an existing component of the existing photovoltaic cell string welding equipment. The auxiliary line lifting mechanism under the movable wiring preparation table has basically the same structure and function as the movable main grid lifting mechanism, except that the auxiliary line lifting mechanism does not need to move back and forth in this embodiment.

[0053] A method for connecting battery strings in series, using the above-mentioned multi-busbar series connection device with multiple wiring, specifically comprises the following steps:

[0054] S1, the busbar wiring mechanism pulls the required number of busbar wirings to the movable wiring preparation table through multiple wirings, and the movable wiring preparation table moves along the second direction so that the groups of busbars that are wired to the movable wiring preparation table are staggered by a certain distance from each other;

[0055] S2, after the main grid line wiring mechanism completes the last wiring, the last group of main grid lines are still held in a clamped state, the auxiliary line wiring mechanism performs wiring of the auxiliary lines, and after the auxiliary line wiring is completed, the auxiliary lines are connected to the main grid lines as a whole through the auxiliary line connecting mechanism;

[0056] S3, the main grid wiring mechanism continues to maintain the clamping state of the last group of main grid lines, and the main grid wiring mechanism continues to move along the first direction to move all the main grid lines on the movable wiring preparation table to the photovoltaic cells on the serial connection workbench to perform wiring and serial connection of the photovoltaic cells.

[0057] S1 specifically includes the following steps:

[0058] S1-1, the movable wiring preparation table moves along the second direction, a part of the preparation limit groove of the movable wiring preparation table corresponds to the wiring position of the main grid wiring end, and the main grid line pulling mechanism pulls the main grid line from the main grid wiring end to the end of the preparation limit groove along the pulling movement direction;

[0059] S1-2, the main grid line cutting mechanism cuts off the main grid line at the outlet end of the main grid line wiring end, the main grid line pulling mechanism is released, and the main grid line falls into the end of the prepared limiting groove;

[0060] S1-3, repeat the operations of S1-1 and S1-2 until the required number of main grid lines are laid on the movable wiring preparation table.

[0061] Example 1

[0062] This embodiment uses the 9BB string welding machine for 158mm size battery cells manufactured by Niu Company for modification.

[0063] In this embodiment, the main gate line wiring mechanism includes a main gate line wiring end 203, a main gate line pulling mechanism (specifically a main gate line pulling clamp 206 in this embodiment) and a main gate line cutting mechanism 210. The main gate line wiring end 203 fixes the end of the main gate line 205 through a main gate line clamping mechanism (not shown in the figure) to prepare for the main gate line pulling clamp 206 to pull out a new main gate line 205 again.

[0064] The auxiliary wire routing mechanism includes an auxiliary wire routing end, an auxiliary wire pulling mechanism (specifically an auxiliary wire pulling clamp 309 in this embodiment), an auxiliary wire cutting mechanism 305 and a steering wheel 303. The auxiliary wire routing end fixes the auxiliary wire 208 through the auxiliary wire clamping mechanism 304, so that the auxiliary wire pulling clamp 309 can pull out a new auxiliary wire 208 again.

[0065] The auxiliary line pulling mechanism, the auxiliary line cutting mechanism 305, and the auxiliary line clamping mechanism 304 have the same structure and function as the main grid line pulling mechanism, the main grid line cutting mechanism 210, and the main grid line clamping mechanism, but the wiring direction is different. The steering wheel 303 is used to change the transmission direction of the auxiliary line. The auxiliary line pulling mechanism is located on one side of the movable wiring preparation platform 202, and the auxiliary line cutting mechanism 305 and the auxiliary line clamping mechanism 304 are located on the other side of the movable wiring preparation platform 202. After the auxiliary line 208 is turned by the steering wheel 303, it passes through the auxiliary line clamping mechanism 304, the auxiliary line cutting mechanism 305, and the auxiliary line pulling mechanism from back to front in sequence.

[0066] The existing string soldering workbench 101 and wiring preparation table 102 are modified. The original string soldering workbench 101 has 9 main grid limiting grooves 207. On the basis of the 9 main grid limiting grooves 207, 9 more main grid limiting grooves 207 are added. The modified string soldering workbench 101 becomes a series connection workbench 201. The series connection workbench 201 has 18 main grid limiting grooves 207. Nine main grid lines 205 are wired on the main grid wiring end 203. The original wiring preparation table 102 has 9 preparation limiting grooves 209. On the basis of the 9 preparation limiting grooves 209, 9 more preparation limiting grooves 209 are added. At the same time, the wiring preparation table 102 is increased with the function of being movable along the second direction. The modified wiring preparation table 102 becomes a movable wiring preparation table 202 with 18 preparation limiting grooves 209.

[0067] The connection method of the serial device includes:

[0068] (1) The movable wiring preparation platform 202 moves downward along the second direction to a position of a / 2 (about 7.9 mm), and the busbar pulling clamp 206 pulls the first batch of busbars 205 (shown by the dotted line) from the busbar wiring end 203 to the front end of the preparation limit groove 209 of the movable wiring preparation platform 202 along the moving direction. At this time, the busbar wiring position on the busbar wiring end 203 corresponds to a group of 9 preparation limit grooves 209 on the surface of the movable wiring preparation platform 202. Figure 2a As shown;

[0069] (2) At the outlet end 204 of the main grid wiring end 203, the main grid wire cutting mechanism 210 cuts off the nine main grid wires 205, and the ends of the nine main grid wires 205 fall into the preparation limiting groove 209. The main grid wire pulling clamp 206 is released, and the nine main grid wires 205 fall into the preparation limiting groove 209 of the movable wiring preparation table 202. Figure 2b As shown;

[0070] (3) The movable wiring preparation table 202 is moved upward along the second direction to a / 2 (about 7.9 mm) and positioned. At this time, the series workbench 201, the movable wiring preparation table 202 and the main grid wiring end 203 are aligned and arranged. The main grid line pulling clamp 206 clamps the main grid line 205 located on the main grid wiring end 203. Figure 2c As shown;

[0071] (4) The busbar pulling clamp 206 pulls out the second batch of busbars 205 (shown by the solid line), and the spacing between the second batch of busbars 205 and the first batch of busbars 205 is a / 2; the busbars 205 for the second batch of wiring are pulled out and cut at the ends, so that the ends fall into the prepared limiting grooves 209. At this time, the heads of the second batch of busbars 205 are still clamped, as shown in FIG. Figure 2d As shown;

[0072] (5) The auxiliary wire wiring mechanism is located above the preparation limit groove 209 to carry out auxiliary wire wiring, and the auxiliary wire welding mechanism works to weld the auxiliary wire 208 and the main grid wire 205 into a multi-main grid interconnected whole, such as Figure 2e As shown;

[0073] (6) The busbar pulling clamp 206 continues to pull the second batch of busbars 205 to drive the entire 18 composite welding ribbons to move to the series connection workbench 201 and wire them on the surface of the battery cell.

[0074] Since the position of the limit groove 209 and the main grid line 205 are overlapped, Figure 2a The prepared limit groove 209 is drawn in the middle. For the convenience of clear vision, the prepared limit groove 209 is Figure 2b , 2c , 2d and 2e are not shown.

[0075] like Figure 3 As shown, the auxiliary line wiring and welding process in step (5) of this embodiment is specifically as follows: when the auxiliary line pulling clamp 309 clamps one end of the auxiliary line 208 and pulls it out from the auxiliary line wiring end, it is wired perpendicular to the main grid line 205, and the other end of the auxiliary line 208 is cut off by the auxiliary line cutting mechanism 305 and falls into the auxiliary line limiting groove. The auxiliary line wiring end fixes the remaining auxiliary line 208 through the auxiliary line clamping mechanism 304, so that the auxiliary line pulling clamp 309 can pull out a new auxiliary line 208 again. Figure 3 A heat pressing strip 310 (or a combination of several heat pressing blocks) as an auxiliary line welding mechanism disposed above the auxiliary line limit groove can be pressed downward to complete the welding of the auxiliary line 208 and the main grid line 205. During the wiring of the auxiliary line 208, the auxiliary line pulling clip 309 and the heat pressing strip 310 should be designed to give way to avoid mutual interference. The heat pressing block 310 can also cooperate with the auxiliary line lifting mechanism 311 to press up and down to achieve a better welding effect.

[0076] In this embodiment, the auxiliary wire 208 and the main grid wire 205 use the same welding strip coated with SiBiAg on the surface. The 9 main grid wires 205 are wired twice, and then connected together through the auxiliary wire 208 perpendicular to the main grid wire 205 to form a multi-main grid interconnection whole with 18 main grid wires 205, that is, a composite welding strip. When the main grid wire pulling clamp 206 drives the second batch of 9 main grid wires 205 to move, the 18 composite welding strips move together as a whole. The subsequent string welding action is consistent with the normal string welding.

[0077] Example 2

[0078] This embodiment uses a 9BB string welding machine for 166mm size battery cells manufactured by Autevi Corporation for modification.

[0079] The difference from Example 1 is that the movable wiring preparation table 202 moves a / 2 along the moving direction by about 8.3 mm; in step (5), the auxiliary line 208 and the main grid line 205 are welded by laser welding, and the laser directly heats and welds the intersection of the main grid line 205 and the auxiliary line 208 from above.

[0080] Example 3

[0081] This embodiment uses a 9BB string welding machine for 166mm size battery cells manufactured by Autevi Corporation for modification.

[0082] The difference from Example 1 is that the movable wiring preparation table 202 moves a / 2 along the moving direction by about 6.3 mm; in step (5), the auxiliary line 208 and the main grid line 205 are welded by laser welding, and the laser directly heats and welds the intersection of the main grid line 205 and the auxiliary line 208 from above.

[0083] In this embodiment, the main grid line 205 is a solder strip coated with SiBiAg, and the auxiliary line 208 is a nylon material. In order to strengthen the bonding between the nylon material and the tin-coated solder strip, the surface of the tin-coated solder strip is pre-treated, mainly roughened. The welding between nylon and metal can simply refer to the mature process of the automotive industry.

[0084] Example 4

[0085] This embodiment designs a 210mm-sized 28BB and 14BB compatible string welding machine.

[0086] The difference from Example 1 is that 14 busbars 205 are kept on the busbar wiring end 203, 14 more busbar limit grooves 207 and preparation limit grooves 209 are added, the serial workbench 201 has 28 busbar limit grooves 207, and the movable wiring preparation table 202 has 28 preparation limit grooves 209. The movable wiring preparation table 202 moves a / 2 along the moving direction, which is about 10.5 mm.

[0087] In this embodiment, the auxiliary wire 208 and the main grid wire 205 use the same welding strip coated with SiBiAg. The 14 main grid wires 205 are wired twice, and then connected together through the auxiliary wire 208 perpendicular to the main grid wire 205 to form a composite welding strip with 28 main grid wires 205. When the main grid wire pulling clamp 206 drives the second batch of 14 main grid wires 205 to move, the 28 composite welding strips move together as a whole. The subsequent string welding action is consistent with the normal string welding.

[0088] In the new equipment design, it is easier to achieve compatibility between 9BB and 18BB, and between 12BB and 24BB, and different operation modes can be switched simply and quickly through software. For example, fast switching for full-cell, half-cell, single-crystal, multi-crystal, etc.

[0089] Example 5

[0090] This embodiment designs a 210mm-sized 28BB and 14BB compatible string welding machine.

[0091] The difference from Example 4 is that in step (5), the auxiliary lines 208 and the main grid lines 205 are welded by laser welding, and the laser directly heats and welds the intersection of the main grid lines 205 and the auxiliary lines 208 from above.

[0092] In the present embodiment, the auxiliary wire 208 and the main grid wire 205 use the same welding strip with SiBiAg coated on the surface. The 14 main grid wires 205 are wired twice, and then connected together through the auxiliary wire 208 perpendicular to the main grid wire 205 to form a composite welding strip with 28 main grid wires 205. When the main grid wire traction clamp 206 drives the second batch of 14 main grid wires 205 to move, the 28 composite welding strips move together as a whole. The subsequent string welding action is slightly different from the normal string welding. Normal string welding uses alloy welding, while in the present embodiment, the welding strip is fixed by a colloid, and the colloid component is UV glue. The conventional main grid welding point is changed to UV glue welding, and the other parts remain consistent. The electrical connection between the main grid wire and the photovoltaic cell is completed in the subsequent component lamination step.

[0093] Example 6

[0094] This embodiment uses a 12BB string welding machine for 166mm size battery cells manufactured by Autevi Corporation for modification.

[0095] The original wiring preparation platform 102 is enlarged by 1.3 times, and the spacing between the main grid line pulling clamps 206 (that is, the spacing between two main grid lines 205) is also increased by 1.3 times. At the same time, the wiring preparation platform 102 is added with the function of being movable along the second direction, becoming a movable wiring preparation platform 202. On the basis of the original 12 limiting grooves, the movable wiring preparation platform 202 has 12 more limiting grooves added to the preparation limiting grooves 209. After the modification, the movable wiring preparation platform 202 has a size of 210 mm and has 24 preparation limiting grooves 209.

[0096] The string soldering workbench of this type of Autech string soldering equipment adopts a conveyor belt mode, so the main transformation work is on the wiring preparation station 102.

[0097] During the first wiring, the movable wiring preparation platform 202 is moved downward along the second direction to a / 2 (about 10.5 mm) to position, and 12 main grid lines 205 are pulled out.

[0098] During the second wiring, the movable wiring preparation platform 202 is moved upward along the second direction to a / 2 (about 10.5 mm) to position, and 12 main grid lines 205 are pulled out.

[0099] Finally, a laser welding module is added, and the laser directly heats and welds the intersection of the main grid line 205 and the auxiliary line 208 from above.

[0100] In this embodiment, the auxiliary wire 208 and the main grid wire 205 use the same welding strip coated with SiBiAg. The main grid wire 205 is wired twice, and then connected together through the auxiliary wire 208 perpendicular to the main grid wire 205 to form a composite welding strip with 24 main grid wires 205. When the main grid wire pulling clamp 206 drives the second batch of 12 main grid wires 205 to move, the 24 composite welding strips move together as a whole. The subsequent string welding action is consistent with the normal string welding.

[0101] Through the above solution, we can simply transform the existing 12BB, 166mm welding machine into a welding machine for 210mm silicon wafers with 24 main grid lines 205.

[0102] Under the inventive concept of the present invention, there are other different specific embodiments, for example, by adjusting the welding method, from hot pressing or laser welding, to hot air, induction heating, resistance welding, infrared welding, etc.; another example is to adjust the material of the grid line, such as adjusting the material of the main grid line, such as replacing the Cu core with Al. Or use Sn alloys with other proportions, etc. Another example is to adjust the wiring method of the auxiliary line, change the on-site wiring to early truncation, and move it to the main grid line when needed, or use more than one auxiliary line, etc. These will not change the essence of the invention, and therefore are also within the protection scope of the present invention.

[0103] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. A multi-busbar series connection device with multiple wiring, comprising a series connection workbench and a busbar line wiring mechanism, wherein the busbar line wiring mechanism is used to perform single wiring of n1 busbars in a first direction, and is characterized by: The multi-busbar series connection device for multiple wiring also includes a movable wiring preparation table, an auxiliary wire wiring mechanism and an auxiliary wire connection mechanism; The movable wiring preparation table can be moved along a second direction perpendicular to the first direction under the drive of the driving mechanism, so as to make each group of n1 main grid lines that are wired by the main grid wiring mechanism to the movable wiring preparation table staggered by a certain distance, and obtain the required n×n1 main grid lines on the movable wiring preparation table, where n is the number of wiring times, and n≥2; An auxiliary line wiring mechanism is used to wire auxiliary lines that intersect with each main grid line to a movable wiring preparation table, wherein at least one auxiliary line is located in front of the main grid line on the movable series connection preparation table; The auxiliary line connection mechanism is used to connect the auxiliary lines on the movable wiring preparation table with the main grid lines.

2. A multi-busbar series device with multiple wiring according to claim 1, characterized in that: The main grid line wiring mechanism includes a main grid line wiring end, a main grid line pulling mechanism and a main grid line cutting mechanism. The main grid line pulling mechanism is used to pull the main grid line from the main grid line wiring end to the movable wiring preparation table and the series workbench in sequence. The main grid line cutting mechanism is used to cut the main grid line at the outlet end of the main grid line wiring end.

3. The multi-busbar series device with multiple wiring according to claim 1, characterized in that: The auxiliary wire wiring mechanism includes an auxiliary wire wiring end, an auxiliary wire pulling mechanism and an auxiliary wire cutting mechanism. The auxiliary wire pulling mechanism is used to pull the auxiliary wire from the auxiliary wire wiring end to the movable wiring preparation table. The auxiliary wire cutting mechanism is used to cut the auxiliary wire at the outlet end of the auxiliary wire wiring end.

4. The multi-busbar series device with multiple wiring according to claim 3, characterized in that: The auxiliary line wiring mechanism also includes an auxiliary line direction-changing mechanism for changing the direction of the auxiliary line, which is used for changing the direction when the auxiliary line wiring direction is inconsistent with the auxiliary line transmission direction, and is specifically a steering wheel.

5. The multi-busbar series device with multiple wiring according to claim 1, characterized in that: The series workbench is provided with a main grid limiting groove, and the movable wiring preparation table is provided with a preparation limiting groove and an auxiliary line limiting groove intersecting with the preparation limiting groove. The main grid limiting groove and the preparation limiting groove limit the main grid line respectively, and the auxiliary line limiting groove limits the auxiliary line.

6. The multi-busbar series device with multiple wiring according to claim 5, characterized in that: The main grid wiring mechanism comprises a main grid wiring end, on which n1 main grids are arranged, and the distance between two adjacent main grids is a, and the number of main grid limiting grooves and preparation limiting grooves is n times of n1, n≥2; The movable wiring preparation table moves a / n distance in a single movement along the second direction.

7. The multi-busbar series device with multiple wiring according to claim 1, characterized in that: The auxiliary line connection mechanism connects the auxiliary line and the main grid line into a whole by welding or bonding. The auxiliary line connection mechanism is an auxiliary line welding mechanism or an auxiliary line bonding mechanism.

8. The multi-busbar series device with multiple wiring according to claim 7, characterized in that: The auxiliary line welding mechanism is an auxiliary line welding mechanism that adopts heating pressure welding, hot air welding, infrared heating welding, induction heating welding, ultrasonic welding, resistance welding or laser welding.

9. The multi-busbar series device with multiple wiring according to claim 1, characterized in that: A movable main grid lifting mechanism is provided below the serial connection workbench, and an auxiliary line lifting mechanism is provided below the movable wiring preparation table.

10. A method for connecting battery strings in series, characterized in that: The multi-busbar series connection device with multiple wirings according to any one of claims 1 to 9 is used for series connection, specifically comprising the following steps: S1, the busbar wiring mechanism pulls the required number of busbar wirings to the movable wiring preparation table through multiple wirings, and the movable wiring preparation table moves along the second direction so that the groups of busbars that are wired to the movable wiring preparation table are staggered by a certain distance from each other; S2, after the main grid line wiring mechanism completes the last wiring, the last group of main grid lines are still held in a clamped state, the auxiliary line wiring mechanism performs wiring of the auxiliary lines, and after the auxiliary line wiring is completed, the auxiliary lines are connected to the main grid lines as a whole through the auxiliary line connecting mechanism; S3, the main grid wiring mechanism continues to maintain the clamping state of the last group of main grid lines, and the main grid wiring mechanism continues to move along the first direction to move all the main grid lines on the movable wiring preparation table to the photovoltaic cells on the serial connection workbench to perform wiring and serial connection of the photovoltaic cells.

11. The method for connecting battery strings in series according to claim 10, characterized in that: The S1 specifically includes the following steps: S1-1, the movable wiring preparation table moves along the second direction, a part of the movable wiring preparation table prepares a limit groove corresponding to the wiring position of the main grid wiring end, and the main grid line pulling mechanism pulls the main grid line from the main grid wiring end to the movable wiring preparation table along the pulling movement direction; S1-2, the main grid line cutting mechanism cuts off the main grid line at the outlet end of the main grid line wiring end, the main grid line pulling mechanism is released, and the main grid line falls into the movable wiring preparation table; S1-3, repeat the operations of S1-1 and S1-2 until the required number of main grid lines are laid on the movable wiring preparation table.

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