IBC battery string series connection method

Abstract

The invention provides an IBC battery string series connection method. The method comprises the steps of obtaining N + 1 solder strip groups forming an IBC battery string; the back faces of the N IBC battery pieces face upwards and are laid on a welding conveying device; and stacking the N + 1 solder strip groups and the N adhesive films on the N IBC battery pieces according to a preset stacking rule of the IBC battery string, so that each adhesive film adheres the corresponding solder strip group to the corresponding battery piece to form the IBC battery string. According to the serial connection method of the IBC battery string, the solder strip group is adhered to the corresponding battery piece through the adhesive film, and the back surface of the IBC battery piece does not generate uniform thermal stress concentration in the serial connection process, so that the conditions of bending deformation, subfissure, fragment and the like of the IBC battery piece are avoided. In addition, after being prepared in advance, the N + 1 solder strip groups required for stringing are stacked on the N IBC battery pieces at a time, so that the stringing efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of battery production, in particular to an IBC battery string connection method. Background Art

[0002] The positive and negative electrodes of the IBC cell (back contact cell) are both arranged on the back of the cell, so that there is no metal electrode blocking the front of the cell facing the sun, thereby improving the power generation efficiency of the photovoltaic module composed of it.

[0003] The positive and negative electrodes of the IBC battery cells are staggered on the back in rows. The positive and negative electrodes on the back of the IBC battery cells are connected by a welding ribbon group to form an IBC battery string.

[0004] In the prior art, high-temperature welding is used to weld the solder strip to the back of the IBC battery string. However, during the high-temperature welding process, since the thermal stress is concentrated on the back of the IBC battery cell, it is easy to cause the IBC battery cell to bend and deform, and even cause hidden cracks and breakage. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an IBC battery string connection method, which adopts the following technical solutions:

[0006] A method for connecting IBC battery strings, comprising:

[0007] Obtaining N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons;

[0008] Lay N IBC cells with their backs facing upward on a welding conveyor;

[0009] N+1 solder ribbon groups and N adhesive film sheets are stacked on N IBC battery cells according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery cell to form an IBC battery string, wherein the predetermined stacking rule is:

[0010] The second half of the first welding ribbon group is located on the first IBC battery cell, and the first half of the first welding ribbon group is located on the welding conveyor; the second half of the i-th welding ribbon group is located on the i-th IBC battery cell, and the first half of the i-th welding ribbon group is located on the i-1-th IBC battery cell, where i is an integer from 2 to N; the second half of the N+1-th welding ribbon group is located on the welding conveyor, and the first half of the N+1-th welding ribbon group is located on the N-th IBC battery cell; N adhesive film sheets are stacked one by one on the N IBC battery cells, and the welding ribbon group is located between the adhesive film sheets and the battery cells.

[0011] The IBC battery string connection method provided in the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, no thermal stress concentration will be generated on the back of the IBC battery cell, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0012] In some embodiments, N+1 solder ribbon groups and N adhesive film sheets are stacked on N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0013] Stack N+1 solder ribbon groups onto N IBC cells;

[0014] Stacking N adhesive film sheets onto N IBC battery sheets;

[0015] heating N adhesive film sheets so that each adhesive film sheet adheres the welding ribbon group to the corresponding battery sheet to form an IBC battery string; or,

[0016] Stacking N+1 solder ribbon groups and N adhesive film sheets on N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0017] Pick up N pre-arranged film sheets through a transport mechanism;

[0018] Pick up N+1 solder ribbon groups through the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet;

[0019] The picked-up N adhesive film sheets and N+1 solder ribbon groups are simultaneously transported to N IBC battery sheets by the transport mechanism;

[0020] Heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string;

[0021] or,

[0022] Stacking N+1 solder ribbon groups and N adhesive film sheets on N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0023] Pick up N pre-arranged film sheets through a transport mechanism;

[0024] Pick up N+1 solder ribbon groups through the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet and is closely attached to the corresponding adhesive film sheet;

[0025] The N adhesive film sheets and N+1 soldering ribbon groups are simultaneously transported to the N IBC battery cells by a transport mechanism. The N adhesive film sheets are heated during the transport process so that each adhesive film sheet adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string.

[0026] Three feasible stacking methods of solder ribbon groups and adhesive film sheets are provided, all of which can ensure that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery cell to form an IBC battery string. Among them, the second stacking method is to transport N adhesive film sheets and N+1 solder ribbon groups to N IBC battery cells at the same time through a transport mechanism, which improves the stacking efficiency of the solder ribbon groups and adhesive film sheets. The third stacking method is to transport N adhesive film sheets and N+1 solder ribbon groups to N IBC battery cells at the same time through a transport mechanism, and heat the adhesive film sheets during the transport process, so that the adhesive film sheets release their stickiness in advance, thereby further improving the stacking efficiency of the solder ribbon groups and adhesive film sheets.

[0027] In some embodiments, obtaining N+1 welding ribbon groups includes:

[0028] Pull out multiple parallel welding strips;

[0029] An odd-numbered welding strip group consisting of all odd-numbered welding strips and an even-numbered welding strip group consisting of all even-numbered welding strips are staggered in the length direction of the welding strips;

[0030] Alternately cutting off the staggered odd-numbered welding ribbon groups and even-numbered welding ribbon groups;

[0031] All the cut odd-numbered welding ribbon groups and even-numbered welding ribbon groups are separated along the length direction of the welding ribbons to obtain N+1 welding ribbon groups.

[0032] By pre-processing multiple parallel solder strips, N+1 solder strip groups can be prepared in advance. In this way, the prepared N+1 solder strip groups can be laid on the battery cells at one time, which improves the efficiency of stringing.

[0033] In some embodiments, N IBC cells are placed on a welding conveyor with their backs facing upward, including:

[0034] Arrange N IBC cells on the transfer platform with their backs facing upwards;

[0035] Pick up the arranged N IBC battery cells from the transfer platform, and place the picked N IBC battery cells on the welding conveyor device.

[0036] By pre-arranging N IBC battery cells, N IBC battery cells can be placed on the welding conveyor device at one time, thereby improving the arrangement efficiency.

[0037] In some embodiments, before picking up the arranged N IBC battery sheets from the transfer platform, the IBC battery string connection method further includes:

[0038] According to the film strip stacking rules, stack N+1 film strips onto the N arranged IBC cells on the transfer platform; or,

[0039] Before stacking N+1 solder ribbon groups and N adhesive film sheets on N IBC battery sheets according to a predetermined stacking rule, the IBC battery string connection method further includes:

[0040] According to the film strip stacking rule, N+1 film strips are stacked on the N IBC battery cells on the welding conveyor device;

[0041] Among them, the film strip stacking rule is: the first film strip is stacked on the head of the first IBC battery cell; the i-th film strip is stacked on the head of the i-th IBC battery cell and the tail of the i-1-th IBC battery cell, where i is an integer from 2 to N; the N+1-th film strip is stacked on the tail of the N-th IBC battery cell.

[0042] In the existing IBC battery string, two adjacent IBC battery cells are connected by a welding ribbon group. From the front of the IBC battery string, the welding ribbon group exposed at the gap between two adjacent IBC battery cells, as well as the welding ribbons at the head and tail of the string can be seen, which affects the integrity and aesthetics of the component. By stacking film strips between adjacent IBC battery cells, at the head of the first IBC battery cell, and at the tail of the Nth IBC battery cell, the welding ribbons between two adjacent IBC battery cells and at the head and tail of the string in the final IBC battery string are covered by the film strips, which improves the integrity and aesthetics of the component.

[0043] In some embodiments, a heating element is provided on the welding conveyor device, and the heating element is used to heat N adhesive film sheets laid on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0044] By arranging a heating element on the welding conveyor device, when N adhesive film sheets and N+1 soldering tape groups are laid on N IBC battery cells, the welding conveyor device heats the adhesive film sheets, so that the adhesive film sheets release their stickiness and then adhere the soldering tape groups to the corresponding battery cells.

[0045] In some embodiments, after stacking N+1 solder ribbon groups and N adhesive film sheets on N IBC battery sheets according to a predetermined stacking rule, the IBC battery string connection method further includes:

[0046] The IBC battery string is conveyed to the bottom of the stringing device by the welding conveying device;

[0047] The IBC battery string is heated and cured using a stringing device.

[0048] By heating and curing the IBC battery string through the stringing device, the viscosity of the adhesive film sheet can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet.

[0049] The present application also provides another battery string connection method, which adopts the following technical solution:

[0050] A method for connecting IBC battery strings, comprising:

[0051] Obtaining N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons;

[0052] N adhesive films and N+1 soldering ribbon groups are stacked on a welding conveyor according to a predetermined stacking rule, and N IBC battery cells are laid one by one on the N adhesive films with their backs facing downward, so that each adhesive film adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string.

[0053] Among them, the predetermined stacking rules are:

[0054] The rear half of the first welding tape group is located on the first adhesive film sheet, and the front half of the first welding tape group is located on the welding conveying device; the rear half of the i-th welding tape group is located on the i-th adhesive film sheet, and the front half of the i-th welding tape group is located on the i-1-th adhesive film sheet, wherein i is an integer from 2 to N; the rear half of the N+1-th welding tape group is located on the welding conveying device, and the front half of the N+1-th welding tape group is located on the N-th adhesive film sheet.

[0055] The IBC battery string connection method provided in the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, the back of the IBC battery cell will not generate concentrated thermal stress, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0056] In some embodiments, N adhesive film sheets and N+1 welding ribbon groups are stacked on a welding conveyor according to a predetermined stacking rule, and N IBC battery sheets are laid one by one on the N adhesive film sheets with their backs facing downward, so that each adhesive film sheet bonds the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0057] Laying N pieces of adhesive film onto the welding conveyor device;

[0058] Stacking N+1 welding ribbon groups onto N adhesive film sheets on the welding conveyor device;

[0059] Lay N IBC battery sheets on N adhesive film sheets one by one with their backs facing downward;

[0060] heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string; or,

[0061] N adhesive film sheets and N+1 soldering ribbon groups are stacked on a welding conveyor according to a predetermined stacking rule, and N IBC battery sheets are laid one by one on the N adhesive film sheets with their backs facing downward, so that each adhesive film sheet bonds the corresponding soldering ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0062] Pick up N+1 welding ribbon groups through the handling mechanism;

[0063] The N pre-arranged adhesive film sheets are picked up by the transport mechanism, and each adhesive film sheet picked up by the transport mechanism is located below the corresponding welding ribbon group;

[0064] The picked-up N+1 solder ribbon groups and N adhesive film sheets are simultaneously transported to the welding conveying device by the transport mechanism;

[0065] Lay N IBC battery sheets with their backs facing downward one by one on N adhesive film sheets on the welding conveyor device;

[0066] heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string; or,

[0067] N adhesive film sheets and N+1 soldering ribbon groups are stacked on a welding conveyor according to a predetermined stacking rule, and N IBC battery sheets are laid one by one on the N adhesive film sheets with their backs facing downward, so that each adhesive film sheet bonds the corresponding soldering ribbon group to the corresponding battery sheet to form an IBC battery string, including:

[0068] Pick up N+1 welding ribbon groups through the handling mechanism;

[0069] The N pre-arranged adhesive film sheets are picked up by the conveying mechanism, so that each adhesive film sheet picked up by the conveying mechanism is located below the corresponding welding tape group and is close to the corresponding welding tape group;

[0070] The N adhesive film sheets and N+1 soldering tape groups are simultaneously transported to the welding conveyor device by a transport mechanism, and the N adhesive film sheets are heated during the transport process so that the soldering tape groups are pre-bonded to the corresponding adhesive film sheets;

[0071] N IBC battery cells are laid one by one with their backs facing downward on N adhesive film sheets on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0072] Three feasible stacking methods of solder ribbon groups and adhesive film sheets are provided, all of which can ensure that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery cell to form an IBC battery string. Among them, the second stacking method is to transport N adhesive film sheets and N+1 solder ribbon groups to N IBC battery cells at the same time through a transport mechanism, which improves the stacking efficiency of the solder ribbon groups and adhesive film sheets. The third stacking method is to transport N adhesive film sheets and N+1 solder ribbon groups to N IBC battery cells at the same time through a transport mechanism, and heat the adhesive film sheets during the transport process, so that the adhesive film sheets release their stickiness in advance, thereby further improving the stacking efficiency of the solder ribbon groups and adhesive film sheets.

[0073] In some embodiments, laying N adhesive film sheets on the welding conveyor device includes: pre-arranging the N adhesive film sheets; picking up the pre-arranged N adhesive film sheets, and laying the N adhesive film sheets on the welding conveyor device.

[0074] It is possible to lay N pieces of adhesive film onto the welding conveyor device at the same time, thus improving the laying efficiency.

[0075] In some embodiments, a heating element is provided on the welding conveyor device, and the heating element is used to heat N adhesive film sheets laid on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0076] By arranging a heating element on the welding conveyor, after N IBC cells are laid on N adhesive film sheets, the welding conveyor heats the adhesive film sheets, so that the adhesive film sheets release the viscosity and then adhere the welding tape group to the corresponding cells. Alternatively, the welding conveyor heats the N adhesive film sheets laid on it in advance to release the viscosity of the adhesive film sheets, so that after N IBC cells are laid on the N adhesive film sheets, the adhesive film sheets immediately adhere the welding tape group to the corresponding cells.

[0077] In some embodiments, obtaining N+1 welding ribbon groups includes:

[0078] Pull out multiple parallel welding strips;

[0079] An odd-numbered welding strip group consisting of all odd-numbered welding strips and an even-numbered welding strip group consisting of all even-numbered welding strips are staggered in the length direction of the welding strips;

[0080] Alternately cutting off the staggered odd-numbered welding ribbon groups and even-numbered welding ribbon groups;

[0081] All the cut odd-numbered welding ribbon groups and even-numbered welding ribbon groups are separated along the length direction of the welding ribbons to obtain N+1 welding ribbon groups.

[0082] By pre-processing a plurality of parallel solder strips, N+1 solder strip groups can be prepared in advance. In this way, the prepared N+1 solder strip groups can be laid out at one time, thereby improving the efficiency of stringing.

[0083] In some embodiments, before placing the N IBC battery sheets with their backs facing downwards one by one on the N adhesive film sheets, the IBC battery string connection method further includes:

[0084] Stack N+1 film strips on N film sheets, where: the 1st film strip is stacked on the head of the 1st film sheet; the i-th film strip is overlapped on the head of the i-th film sheet and the tail of the i-1-th film sheet, where i is an integer from 2 to N; the N+1th film strip is stacked on the tail of the Nth film sheet, and each film strip is located above the corresponding welding tape group.

[0085] In the existing IBC battery string, two adjacent IBC battery cells are connected by a welding ribbon group. From the front of the IBC battery string, the welding ribbon group exposed at the gap between two adjacent IBC battery cells, as well as the welding ribbons at the head and tail of the string can be seen, which affects the integrity and aesthetics of the component. By stacking film strips between adjacent film sheets, at the head of the first film sheet, and at the tail of N film sheets, the welding ribbons between two adjacent IBC battery cells and at the head and tail of the string in the final IBC battery string are covered by the film sheets, which improves the integrity and aesthetics of the component.

[0086] In some embodiments, N IBC battery sheets are laid one by one on N adhesive film sheets with their backs facing downward, including:

[0087] According to the string arrangement rules, N IBC cells are pre-arranged on the transfer platform with the back side facing downwards;

[0088] Pick up the arranged N IBC battery cells from the transfer platform, and place the picked N IBC battery cells one by one on the N adhesive film sheets on the welding conveyor device.

[0089] By pre-arranging N IBC battery cells on the transfer platform, it is possible to place the N IBC battery cells one by one on the N adhesive film sheets on the welding conveyor device, thereby improving the stringing efficiency.

[0090] In some embodiments, after N IBC battery cells are laid one by one on N adhesive film sheets with their back sides facing down, the IBC battery string connection method also includes: conveying the IBC battery string to the bottom of the stringing device through a welding conveying device; and heating and curing the IBC battery string using the stringing device.

[0091] By heating and curing the IBC battery string through the stringing device, the viscosity of the adhesive film sheet can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] Figure 1 It is a schematic diagram of all the pre-prepared welding ribbon groups constituting the IBC battery string in the first embodiment of the present invention;

[0093] Figure 2 A schematic diagram of all IBC battery cells pre-arranged to form an IBC battery string in the first embodiment of the present invention;

[0094] Figure 3 This is a schematic diagram of placing all the arranged IBC battery sheets on the welding conveyor device in the first embodiment of the present invention;

[0095] Figure 4 A schematic diagram of all the adhesive film sheets pre-arranged to form an IBC battery string in the first embodiment of the present invention;

[0096] Figure 5 It is a schematic diagram of stacking all the adhesive film sheets and all the welding ribbon groups constituting the IBC battery string in the first embodiment of the present invention;

[0097] Figure 6 It is a schematic diagram of the first embodiment of the present invention after all the adhesive film sheets and all the welding ribbon groups are stacked on the IBC battery sheet;

[0098] Figure 7 It is a schematic diagram of conveying the stacked IBC battery sheets, welding ribbon groups and adhesive film sheets to the stringing device in the first embodiment of the present invention;

[0099] Figure 8 It is a schematic diagram of an IBC battery string being transported to a material unloading station in the first embodiment of the present invention;

[0100] Fig. 9 It is a schematic diagram of a conveying line in which an IBC battery string is transferred to a typesetting conveyor in a first embodiment of the present invention;

[0101] Fig.10 It is a schematic diagram of all the pre-prepared welding ribbon groups constituting the IBC battery string in the second embodiment of the present invention;

[0102] Fig.11 A schematic diagram of all IBC battery cells pre-arranged to form an IBC battery string in the second embodiment of the present invention;

[0103] Fig.12 A schematic diagram of stacking the adhesive film strips onto the IBC cell;

[0104] Fig.13It is a schematic diagram of placing an IBC with a film strip on a welding conveyor device in the second embodiment of the present invention;

[0105] Fig.14 A schematic diagram of all the adhesive film sheets pre-arranged to form an IBC battery string in the second embodiment of the present invention;

[0106] Fig.15 A schematic diagram of stacking all the adhesive film sheets and all the welding ribbon groups constituting the IBC battery string in the second embodiment of the present invention;

[0107] Fig.16 It is a schematic diagram of a second embodiment of the present invention after all the adhesive film sheets and all the welding ribbon groups are stacked on the IBC battery sheet;

[0108] Fig.17 It is a schematic diagram of conveying the stacked IBC battery cells, adhesive film strips, welding ribbon groups and adhesive film sheets to the stringing device in the second embodiment of the present invention;

[0109] Fig.18 It is a schematic diagram of an IBC battery string being transported to a material unloading station in a second embodiment of the present invention;

[0110] Fig.19 A schematic diagram of a conveying line in which an IBC battery string is transferred to a typesetting conveyor in a second embodiment of the present invention;

[0111] Fig. 20 A schematic diagram of all welding ribbon groups pre-prepared to form an IBC battery string in the third embodiment of the present invention;

[0112] Fig.21 A schematic diagram of all the adhesive film sheets pre-arranged to form an IBC battery string in the third embodiment of the present invention;

[0113] Fig. 22 It is a schematic diagram of placing the adhesive film sheet and the welding ribbon group on the welding conveying device in the third embodiment of the present invention;

[0114] Fig.23 A schematic diagram of all IBC battery cells pre-arranged to form an IBC battery string in the third embodiment of the present invention;

[0115] Fig.24 It is a schematic diagram of a third embodiment of the present invention after all IBC cells are stacked on the adhesive film sheet;

[0116] Fig.25 It is a schematic diagram of conveying the stacked adhesive film sheets, welding ribbon groups and IBC battery sheets to the stringing device in the third embodiment of the present invention;

[0117] Fig.26It is a schematic diagram of an IBC battery string being transported to a material unloading station in the third embodiment of the present invention;

[0118] Fig. 27 It is a schematic diagram of a conveying line in which an IBC battery string is transferred to a typesetting conveyor in a third embodiment of the present invention;

[0119] Fig.28 A schematic diagram of all welding ribbon groups pre-prepared to form an IBC battery string in a fourth embodiment of the present invention;

[0120] Fig.29 A schematic diagram of all the adhesive film sheets pre-arranged to form an IBC battery string in the fourth embodiment of the present invention;

[0121] Fig.30 A schematic diagram of all the adhesive film strips constituting an IBC battery string prepared in the fourth embodiment of the present invention;

[0122] Fig.31 It is a schematic diagram of placing the adhesive film sheet, adhesive film strip and welding ribbon group on the welding conveying device in the fourth embodiment of the present invention;

[0123] Fig.32 It is a schematic diagram of placing the adhesive film sheet, adhesive film strip and welding ribbon group on the welding conveying device in the fourth embodiment of the present invention;

[0124] Fig.33 It is a schematic diagram of a fourth embodiment of the present invention after all IBC cells are stacked on the adhesive film sheet;

[0125] Fig.34 It is a schematic diagram of conveying the stacked adhesive film sheets, adhesive film strips, welding ribbon groups and IBC battery cells to the stringing device in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0126] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0127] In the prior art, high-temperature welding is used to weld the solder strip to the back of the IBC battery string. However, during the high-temperature welding process, since the thermal stress is concentrated on the back of the IBC battery cell, it is easy to cause the IBC battery cell to bend and deform, and even cause hidden cracks and breakage.

[0128] In order to solve the above technical problems existing in the high-temperature welding of existing IBC battery strings, the present application provides an IBC battery string welding method, which adheres the welding ribbon group to the corresponding battery cell through an adhesive film sheet. During the string connection process, no thermal stress is concentrated on the back of the IBC battery cell, thereby avoiding bending deformation, hidden cracks, and broken pieces of the IBC battery cell. The IBC battery string welding method of the present invention will be described in an exemplary manner through four embodiments.

[0129] First embodiment

[0130] The IBC battery string welding method provided in this embodiment includes the following steps:

[0131] S11. Obtain N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons.

[0132] S12, laying N IBC battery cells with their backs facing upward on a welding conveyor.

[0133] Optionally, the welding conveying device includes a bracket, a driving roller, a driven roller, a driving motor, a conveyor belt and a support plate. The driving roller and the driven roller are mounted on the bracket, and the conveyor belt is sleeved on the driving roller and the driven roller. The support plate is mounted on the bracket and is located below the conveying surface of the conveyor belt to support the conveyor belt.

[0134] The driving motor is used to drive the active roller to rotate, so as to drive the conveyor belt to convey. The conveyor belt is provided with adsorption holes connected to the negative pressure device. N IBC battery cells are laid on the conveyor belt with their backs facing upwards, and the conveyor belt adsorbs the IBC battery cells through the adsorption holes.

[0135] Optionally, a heating element is further provided in the support plate, and the heating element is a heating rod or an electric heating wire. The support plate can heat the IBC battery cell and the welding tape group and the adhesive film sheet stacked on the IBC battery cell, so that the adhesive film sheet releases its viscosity and adheres the welding tape group to the corresponding IBC battery cell.

[0136] S13, stacking N+1 welding ribbon groups and N adhesive film sheets on N IBC battery cells according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string, wherein the predetermined stacking rule is: the second half of the first welding ribbon group is located on the first IBC battery cell, and the first half of the first welding ribbon group is located on the welding conveyor; the second half of the i-th welding ribbon group is located on the i-th IBC battery cell, and the first half of the i-th welding ribbon group is located on the i-1-th IBC battery cell, i is an integer from 2 to N; the second half of the N+1-th welding ribbon group is located on the welding conveyor, and the first half of the N+1-th welding ribbon group is located on the N-th IBC battery cell; N adhesive film sheets are stacked on the N IBC battery cells one by one, and the welding ribbon groups are located between the adhesive film sheets and the battery cells.

[0137] The adhesive film sheet can be a whole piece of adhesive film sheet that matches the size of the IBC battery cell, which can bond all the welding strips in the welding strip group to the corresponding battery cell. The adhesive film sheet can also be composed of a plurality of adhesive film strips that are spaced apart and parallel to the welding strips, and each adhesive film strip bonds at least one welding strip in the welding strips to the corresponding battery cell. The adhesive film sheets in the subsequent embodiments can also be a whole piece of adhesive film sheet, or composed of a plurality of adhesive film strips that are spaced apart and parallel to the welding strips.

[0138] It can be seen that the IBC battery string connection method provided in the embodiment of the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, no thermal stress is concentrated on the back of the IBC battery cell, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0139] In this embodiment, the IBC battery string to be obtained is formed by connecting N IBC battery cells in series through N+1 welding ribbon groups. In this embodiment, the pre-preparation of the N+1 welding ribbon groups is completed at one time, so that the prepared N+1 welding ribbon groups can be laid on the welding bearing part at one time, thereby improving the efficiency of stringing.

[0140] Optionally, the specific implementation process of step S11 is as follows:

[0141] Pull out multiple parallel welding strips. For example, Figure 1 In the embodiment, 19 welding ribbons need to be pulled out.

[0142] Optionally, the traction of multiple parallel solder ribbons is achieved through a solder ribbon traction mechanism, which includes a moving module and a solder ribbon clamp, wherein the solder ribbon clamp is connected to a movable part of the moving module, and the moving module drives the solder ribbon clamp to translate and lift, so as to drive the solder ribbon clamp to clamp multiple parallel solder ribbons from a solder ribbon feeding device and implement traction of the multiple parallel solder ribbons.

[0143] The odd-numbered welding strip group consisting of all the odd-numbered welding strips and the even-numbered welding strip group consisting of all the even-numbered welding strips are staggered in the length direction of the welding strips. For example, Figure 1 In the embodiment, the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th and 19th welding ribbons constitute an odd-numbered welding ribbon group, and the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th and 18th welding ribbons constitute an even-numbered welding ribbon group.

[0144] The staggered odd-numbered welding strip groups and even-numbered welding strip groups are cut alternately. Optionally, the welding strips are clamped by a welding strip clamping assembly, and then the welding strips are cut at corresponding positions by a cutter.

[0145] All the cut odd-numbered welding ribbon groups and even-numbered welding ribbon groups are separated along the length direction of the welding ribbon to obtain N+1 welding ribbon groups. For example, Figure 1 In the embodiment, 13 welding ribbon groups are obtained in total, 6 welding ribbon groups are formed by cutting the odd-numbered welding ribbon groups, and the remaining 7 welding ribbon groups are formed by cutting the even-numbered welding ribbon groups.

[0146] Optional, such as Figure 2 As shown, the specific implementation process of step S12 is: according to the stringing rules of IBC battery strings, N IBC battery cells are first arranged on the transfer platform with the back side facing upward. Figure 3 As shown, N arranged IBC battery cells are picked up from the transfer platform, and the picked N IBC battery cells are placed on the welding conveyor device 100.

[0147] Of course, the N IBC battery cells may also be placed one by one on the welding conveyor device 100 according to the stringing rule of the target battery string.

[0148] Optionally, step S13 can be implemented according to the following three optional implementations:

[0149] The first implementation method, the specific implementation process is as follows:

[0150] Step S131, stacking N+1 welding ribbon groups on N IBC battery cells according to stacking rules.

[0151] Specifically, the second half of the first welding ribbon group is located on the first IBC battery cell, and the first half of the first welding ribbon group is located on the welding conveyor; the second half of the i-th welding ribbon group is located on the i-th IBC battery cell, and the first half of the i-th welding ribbon group is located on the i-1-th IBC battery cell, where i is an integer from 2 to N.

[0152] Step S132, stacking N adhesive film sheets one by one on N IBC battery sheets.

[0153] Optional, such as Figure 4 As shown, N adhesive film sheets are first pre-arranged according to the IBC battery cell string rule, and then the pre-arranged N adhesive film sheets are picked up and stacked on the N IBC battery cells in sequence.

[0154] Step S133, heating N adhesive film sheets so that each adhesive film sheet adheres the welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0155] Optionally, after N adhesive film sheets are stacked one by one on N IBC battery cells, the welding conveyor device heats the adhesive film sheets through a support plate having a heating element therein, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0156] Optionally, an adsorption plate is used to absorb N pre-arranged adhesive film sheets. After the adsorption plate stacks the N adhesive film sheets on the N IBC battery cells in sequence, the N adhesive film sheets are kept pressed on the N IBC battery cells until each adhesive film sheet releases its stickiness and adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0157] Optionally, a heating element is provided in the adsorption plate, and when the adsorption plate is pressed against the adhesive film sheet, the adhesive film sheet can be heated by the heating element therein, so that each adhesive film sheet can adhere the corresponding welding ribbon group to the corresponding battery sheet when releasing the stickiness to form an IBC battery string. The heating element can be, for example, a heating rod or an electric heating wire.

[0158] The second implementation method is as follows:

[0159] Step S131 : picking up N pre-arranged adhesive film sheets through a transport mechanism.

[0160] like Figure 4 As shown, before this, N adhesive film sheets need to be pre-arranged according to the IBC battery cell string rules.

[0161] Step S132: Pick up N+1 solder ribbon groups through the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet.

[0162] Optionally, the transport mechanism includes a film adsorption unit and a solder strip pickup unit, wherein the film adsorption unit is configured to be able to rise and fall in the vertical direction. The film adsorption unit picks up N pre-arranged film sheets and then rises, so that the N film sheets are located above the solder strip pickup unit. Then, the solder strip pickup unit picks up N+1 solder strip groups. In this way, Figure 5 As shown, it can be ensured that each welding ribbon group picked up by the conveying mechanism is located below the corresponding adhesive film sheet.

[0163] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0164] Step S133: The picked-up N adhesive film sheets and N+1 solder ribbon groups are simultaneously transported to the N IBC battery sheets by the transport mechanism.

[0165] So, like Figure 6 As shown, N battery cells, N+1 solder ribbon groups and N adhesive film sheets are stacked on the welding conveyor device 100 in sequence from bottom to top.

[0166] Step S134, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string;

[0167] Optionally, after N adhesive film sheets are stacked one by one on N IBC battery cells, the welding conveyor device heats the adhesive film sheets through a support plate in which a heating element is arranged, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0168] Optionally, after N adhesive film sheets and N+1 solder ribbon groups are simultaneously transported to N IBC battery cells, the adhesive film adsorption portion of the transport mechanism descends to keep the N adhesive film sheets pressed tightly against the N IBC battery cells until each adhesive film sheet releases its stickiness and adheres the corresponding solder ribbon group to the corresponding IBC battery cell to form an IBC battery string.

[0169] Optionally, a heating element is provided in the adhesive film adsorption part. When the adhesive film adsorption part compresses the adhesive film sheet, the heating element therein can heat the adhesive film sheet, so that each adhesive film sheet can adhere the corresponding welding ribbon group to the corresponding battery sheet when releasing the stickiness to form an IBC battery string. The heating element can be, for example, a heating rod or an electric heating wire.

[0170] Compared with the first embodiment, this embodiment uses a conveying mechanism to simultaneously convey N adhesive film sheets and N+1 soldering ribbon groups to N IBC battery cells, thereby improving the stacking efficiency of the soldering ribbon groups and adhesive film sheets.

[0171] The third implementation method is as follows:

[0172] Step S131 : picking up N pre-arranged adhesive film sheets through a transport mechanism.

[0173] like Figure 4 As shown, before this, N adhesive film sheets need to be pre-arranged according to the IBC battery cell string rules.

[0174] Step S132: Pick up N+1 solder ribbon groups through the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet and is closely attached to the corresponding adhesive film sheet.

[0175] Optionally, the transport mechanism is provided with a film adsorption portion and a solder strip picking portion, wherein the film adsorption portion is configured to be able to rise and fall in the vertical direction. The film adsorption portion picks up N pre-arranged film sheets and then rises, so that the N film sheets are located above the solder strip picking portion. Subsequently, the solder strip picking portion picks up N+1 solder strip groups. The film adsorption portion appropriately descends so that each solder strip group is closely attached to the corresponding film sheet.

[0176] So, like Figure 5 As shown, it can be ensured that each welding ribbon group picked up by the conveying mechanism is located below the corresponding adhesive film sheet and is closely attached to the corresponding adhesive film sheet.

[0177] Step S133, N adhesive film sheets and N+1 soldering ribbon groups are simultaneously transported to N IBC battery cells by a transport mechanism, and the N adhesive film sheets are heated during the transport process so that each adhesive film sheet adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string.

[0178] Optionally, a heating element is provided in the adhesive film adsorption part, and during the handling process, the adhesive film adsorption part heats the adhesive film sheet through the heating element. The heating element may be, for example, a heating rod or an electric heating wire.

[0179] Compared with the second embodiment, this embodiment heats the adhesive film during the handling process to release the adhesive film in advance. In this way, when the adhesive film and the soldering tape group are stacked on the IBC battery cell, the adhesive film immediately adheres the soldering tape group to the corresponding IBC battery cell, thereby further improving the stacking efficiency of the soldering tape group and the adhesive film.

[0180] Finally, if Figure 6 As shown, N battery cells, N+1 welding ribbon groups and N adhesive film sheets are stacked on the welding conveyor device 100 from bottom to top, and the welding ribbon groups are bonded to the corresponding IBC battery cells to form an IBC battery string.

[0181] Optional, such as Figure 7 After executing step S13, the IBC battery string welding method in the embodiment of the present application further includes:

[0182] Step S14: The IBC battery string is transported to the bottom of the stringing device 200 by the welding conveying device 100; and the IBC battery string is heated and cured by the stringing device 200.

[0183] By heating and curing the IBC battery string through the stringing device 200, the adhesiveness of the adhesive film can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet. The stringing device 200 can be an infrared heating device, a hot pressing device, a hot air blowing device, a UV lamp device, a microwave heating device, or an LED irradiation heating device.

[0184] like Figure 8 As shown, after heating and curing, the welding conveying device 100 continues to convey the IBC battery string forward to the unloading station.

[0185] Optional, such as Fig. 9 As shown, the IBC battery string at the unloading station is transferred to the conveying line 300 of the typesetting conveyor by the transfer device.

[0186] Second embodiment

[0187] The IBC battery string welding method provided in this embodiment includes the following steps:

[0188] S21. Obtain N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons.

[0189] S22, laying N IBC battery cells with their backs facing upward on the welding conveyor device.

[0190] S23, stacking N+1 welding ribbon groups and N adhesive film sheets on N IBC battery cells according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string, wherein the predetermined stacking rule is: the second half of the first welding ribbon group is located on the first IBC battery cell, and the first half of the first welding ribbon group is located on the welding conveyor; the second half of the i-th welding ribbon group is located on the i-th IBC battery cell, and the first half of the i-th welding ribbon group is located on the i-1-th IBC battery cell, i is an integer from 2 to N; the second half of the N+1-th welding ribbon group is located on the welding conveyor, and the first half of the N+1-th welding ribbon group is located on the N-th IBC battery cell; N adhesive film sheets are stacked on the N IBC battery cells one by one, and the welding ribbon groups are located between the adhesive film sheets and the battery cells.

[0191] It can be seen that the IBC battery string connection method provided in the embodiment of the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, no thermal stress is concentrated on the back of the IBC battery cell, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0192] Similar to the first embodiment, in this embodiment, the target battery string is formed by connecting N IBC battery cells in series via N+1 welding ribbon groups. In this embodiment, the pre-preparation of the N+1 welding ribbon groups is completed at one time, so that the prepared N+1 welding ribbon groups can be laid on the welding bearing part at one time, thereby improving the efficiency of stringing.

[0193] In this embodiment, the N+1 welding ribbon groups (such as Fig.10 The one-time preparation method of 13) in the embodiment, that is, the specific implementation process of step S11 is the same as that in the first embodiment, and will not be repeated here.

[0194] In the existing IBC battery string, two adjacent IBC battery cells are connected by a welding ribbon group. From the front of the IBC battery string, the welding ribbon group exposed at the inter-cell spacing between two adjacent IBC battery cells and the welding ribbons at the string head and string tail can be seen, which affects the integrity and aesthetics of the assembly. In order to solve this problem, this embodiment adjusts step S22, with the purpose of laying adhesive film strips at the inter-cell spacing of the IBC battery string and at the string head and string tail to cover the welding ribbon group.

[0195] In order to solve this problem, in this embodiment, the specific implementation process of step S22 is as follows:

[0196] First, if Fig.11 As shown, according to the stringing rule of the target battery string, N IBC battery cells are pre-arranged on the transfer platform with their backs facing upwards.

[0197] Then, if Fig.12 As shown, according to the film strip stacking rule, N+1 film strips are stacked on the N arranged IBC cells on the transfer platform, wherein the film strip stacking rule is as follows: the first film strip is stacked on the head of the first IBC cell. The i-th film strip is placed on the head of the i-th IBC cell and the tail of the i-1-th IBC cell, where i is an integer from 2 to N. The N+1th film strip is stacked on the tail of the N-th IBC cell.

[0198] Then, if Fig.13 As shown, N arranged IBC cells with adhesive film strips stacked thereon are picked up from the transfer platform, and the picked N IBC cells are laid on the welding conveyor 100. The cell can be moved by a cell handling device, which includes a moving module and a suction cup mounted on the moving module for adsorbing the cell.

[0199] Of course, it is also possible to lay N IBC battery cells on the welding conveyor device 100 and then stack N+1 adhesive film strips on the N IBC battery cells according to the above-mentioned adhesive film strip stacking rules.

[0200] Similar to the first embodiment, step S23 in this embodiment can also be implemented in three optional implementations. The three optional implementations in this embodiment are completely the same as the three implementations in the first embodiment.

[0201] Therefore, for the sake of simplicity, this paper combines Figures 14 to 16 , only the second implementation mode is described, and the first and third implementation modes refer to the relevant contents of the first embodiment. The specific process of the second implementation mode is as follows:

[0202] Step S231 : picking up N pre-arranged adhesive film sheets through a transport mechanism.

[0203] like Fig.14 As shown, before this, N adhesive film sheets need to be pre-arranged according to the IBC battery cell string rules.

[0204] Step S232: Pick up N+1 solder ribbon groups through the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet.

[0205] Optionally, the transport mechanism is provided with a film adsorption unit and a solder strip pickup unit, wherein the film adsorption unit is configured to be able to rise and fall in a vertical direction. The film adsorption unit picks up N pre-arranged film sheets and then rises, so that the N film sheets are located above the solder strip pickup unit. Subsequently, the solder strip pickup unit picks up N+1 solder strip groups.

[0206] So, like Fig.15 As shown, it can be ensured that each welding ribbon group picked up by the conveying mechanism is located below the corresponding adhesive film sheet.

[0207] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0208] Step S233: The picked-up N adhesive film sheets and N+1 solder ribbon groups are simultaneously transported to the N IBC battery sheets by the transport mechanism.

[0209] So, like Fig.16 As shown, N battery cells, N+1 adhesive film strips, N+1 soldering ribbon groups and N adhesive film sheets are stacked on the welding conveyor device 100 in sequence from bottom to top.

[0210] Step S234, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0211] Optional, such as Fig.17After executing step S23, the IBC battery string welding method in the embodiment of the present application further includes:

[0212] Step S24: The IBC battery string is transported to the bottom of the stringing device 200 by the welding conveying device 100; and the IBC battery string is heated and cured by the stringing device.

[0213] By heating and curing the IBC battery string through the stringing device 200, the adhesiveness of the adhesive film can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet. The stringing device 200 can be an infrared heating device, a hot pressing device, a hot air blowing device, a UV lamp device, a microwave heating device, or an LED irradiation heating device.

[0214] like Fig.18 As shown, after heating and curing, the welding conveying device 100 continues to convey the IBC battery string forward to the unloading station.

[0215] Optional, such as Fig.19 As shown, the IBC battery string at the unloading station is transferred to the conveying line 300 of the typesetting conveyor by the transfer device.

[0216] Third embodiment

[0217] The IBC battery string welding method provided in this embodiment includes the following steps:

[0218] S31. Obtain N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons.

[0219] S32, stacking N adhesive film sheets and N+1 soldering ribbon groups on a welding conveyor according to a predetermined stacking rule, and laying N IBC battery cells with their backs facing downward on the N adhesive film sheets one by one, so that each adhesive film sheet adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string,

[0220] Among them, the predetermined stacking rules are:

[0221] The rear half of the first welding tape group is located on the first adhesive film sheet, and the front half of the first welding tape group is located on the welding conveying device; the rear half of the i-th welding tape group is located on the i-th adhesive film sheet, and the front half of the i-th welding tape group is located on the i-1-th adhesive film sheet, wherein i is an integer from 2 to N; the rear half of the N+1-th welding tape group is located on the welding conveying device, and the front half of the N+1-th welding tape group is located on the N-th adhesive film sheet.

[0222] It can be seen that the IBC battery string connection method provided in the embodiment of the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, no thermal stress is concentrated on the back of the IBC battery cell, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0223] In this embodiment, the target battery string is formed by connecting N IBC battery cells in series through N+1 welding ribbon groups. In this embodiment, the pre-preparation of the N+1 welding ribbon groups is completed at one time, so that the prepared N+1 welding ribbon groups can be laid on the welding bearing part at one time, thereby improving the efficiency of stringing.

[0224] In this embodiment, the N+1 welding ribbon groups (such as Fig. 20 The one-time preparation method of step S31 is the same as that in the first embodiment and will not be repeated here.

[0225] The welding conveying device in this embodiment can adopt the same structure as that in the first embodiment, and will not be described again here.

[0226] Step S32 in this embodiment can be implemented according to the following three optional implementation methods.

[0227] The first implementation method comprises the following steps:

[0228] S321, laying N adhesive film sheets onto the welding conveying device.

[0229] Optionally, the specific implementation process of step S321 is as follows: Fig.21 As shown, N adhesive film sheets are pre-arranged according to the IBC battery sheet string rule. Then, the pre-arranged N adhesive film sheets are picked up and laid on the welding conveyor device 100.

[0230] Optionally, the welding conveying device 100 fixes the N adhesive film sheets by adsorbing them through adsorption holes on the conveyor belt.

[0231] S322, stacking N+1 welding ribbon groups onto the N adhesive film sheets on the welding conveying device.

[0232] After executing step S322, N adhesive film sheets are laid on the welding conveyor device 100, and N+1 welding ribbon groups are stacked on the N adhesive film sheets according to the above-mentioned predetermined stacking rule.

[0233] S323, laying N IBC battery cells with their backs facing downward on N adhesive film sheets one by one.

[0234] Optional, such as Fig.23As shown in FIG. 1 , N IBC cells can be pre-arranged on the transfer platform with the back side facing downwards according to the string arrangement rule. Then the arranged N IBC cells are picked up from the transfer platform at one time, and the picked N IBC cells are placed as shown in FIG. Fig.24 As shown, they are laid one by one on the N adhesive film sheets on the welding conveyor device.

[0235] Of course, N IBC battery cells can also be laid one by one on the corresponding film sheets.

[0236] S324, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0237] Optionally, after N IBC battery cells are laid one by one on N adhesive film sheets with their back sides facing down, the welding conveying device can heat the adhesive film sheets through a support plate heating element in which a heating element is provided, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0238] The second implementation method comprises the following steps:

[0239] S321. Pick up N+1 welding ribbon groups through the transport mechanism.

[0240] S322, picking up N pre-arranged adhesive film sheets through a transport mechanism, and making each adhesive film sheet picked up by the transport mechanism be located below a corresponding welding ribbon group.

[0241] The N pre-arranged film sheets are as follows: Fig.21 shown.

[0242] Optionally, the transport mechanism is provided with a solder ribbon pickup unit and an adhesive film adsorption unit, wherein the solder ribbon pickup unit is configured to be able to rise and fall in a vertical direction. The solder ribbon pickup unit picks up N+1 solder ribbon groups and then rises, so that the N+1 solder ribbon groups are located above the adhesive film adsorption unit. Subsequently, the adhesive film adsorption unit picks up N adhesive film sheets.

[0243] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0244] S323, the picked-up N+1 welding ribbon groups and N adhesive film sheets are simultaneously transported to the welding conveying device by the transport mechanism.

[0245] After executing step S323, Fig. 22 As shown, N adhesive film sheets are laid on the welding conveyor device 100, and N+1 welding ribbon groups are stacked on the N adhesive film sheets according to a predetermined stacking rule.

[0246] Optionally, the welding conveying device 100 fixes the adhesive film sheet by adsorbing it through adsorption holes on the conveyor belt.

[0247] S324, placing N IBC battery cells with their backs facing downwards on the N adhesive film sheets on the welding conveyor device in a one-to-one correspondence.

[0248] Optional, such as Fig.23 As shown in FIG. 1 , N IBC battery cells can be pre-arranged on the transfer platform with their backs facing downwards according to the IBC battery string arrangement rules. Then the arranged N IBC battery cells are picked up from the transfer platform at one time, and the picked N IBC battery cells are placed as shown in FIG. Fig.24 As shown, they are laid one by one on the N adhesive film sheets on the welding conveying device 100.

[0249] Of course, N IBC battery cells can also be laid one by one on the corresponding film sheets.

[0250] S325, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0251] Optionally, after N IBC battery cells are laid one by one with their backs facing down on N adhesive film sheets, the welding conveyor device heats the adhesive film sheets through a support plate with a heating element installed therein, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0252] The third implementation method comprises the following steps:

[0253] S321. Pick up N+1 welding ribbon groups through the transport mechanism.

[0254] S322, picking up N pre-arranged adhesive film sheets through a conveying mechanism, so that each adhesive film sheet picked up by the conveying mechanism is located below a corresponding soldering ribbon group and is closely attached to the corresponding soldering ribbon group.

[0255] The N pre-arranged film sheets are as follows: Fig.21 shown.

[0256] Optionally, the transport mechanism is provided with a solder ribbon pickup unit and an adhesive film adsorption unit, wherein the solder ribbon pickup unit is configured to be able to rise and fall in the vertical direction. The solder ribbon pickup unit picks up N+1 solder ribbon groups and then rises, so that the N+1 solder ribbon groups are located above the adhesive film adsorption unit. Subsequently, the adhesive film adsorption unit picks up N adhesive film sheets. Then, the solder ribbon pickup unit is lowered by an appropriate distance, so that each adhesive film sheet is closely attached to the corresponding solder ribbon group.

[0257] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0258] S323, transporting N adhesive film sheets and N+1 soldering tape groups to the welding conveying device at the same time through the transporting mechanism, and heating the N adhesive film sheets during the transporting process so that each soldering tape group is pre-bonded to the corresponding adhesive film sheets.

[0259] Optionally, a heating element is provided in the adhesive film adsorption part, and during the handling process, the adhesive film adsorption part heats the adhesive film sheet through the heating element, so that the adhesive film sheet releases its stickiness in advance. The heating element can be, for example, a heating rod or an electric heating wire.

[0260] After executing step S323, Fig. 22 As shown, N adhesive film sheets are laid on the welding conveyor device 100, and N+1 welding ribbon groups are stacked on the N adhesive film sheets according to a predetermined stacking rule.

[0261] Optionally, the welding conveyor device 100 fixes the adhesive film sheet by adsorbing it through adsorption holes on the conveyor belt.

[0262] S324, placing N IBC battery cells with their backs facing downward on the N adhesive film sheets on the welding conveyor device 100 one by one, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0263] Since the adhesive film is preheated during transportation, its viscosity has been released. Therefore, after N IBC battery cells are laid one by one on the N adhesive film sheets with their backs facing down, the adhesive film sheets will then bond the welding ribbon groups to the corresponding IBC battery cells.

[0264] Optional, such as Fig.23 As shown in FIG. 1 , N IBC cells can be pre-arranged on the transfer platform with the back side facing downwards according to the string arrangement rule. Then the arranged N IBC cells are picked up from the transfer platform at one time, and the picked N IBC cells are placed as shown in FIG. Fig.24 As shown, they are laid one by one on the N adhesive film sheets on the welding conveyor device. Of course, the N IBC battery sheets can also be laid one by one on the corresponding adhesive film sheets.

[0265] like Fig.25 Optionally, after executing step S32, the IBC battery string welding method in the embodiment of the present application further includes:

[0266] Step S33: transport the IBC battery string to the bottom of the stringing device 200 through the welding conveying device 100; and use the stringing device to heat and solidify the IBC battery string.

[0267] By heating and curing the IBC battery string through the stringing device 200, the adhesiveness of the adhesive film can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet. The stringing device 200 can be an infrared heating device, a hot pressing device, a hot air blowing device, a UV lamp device, a microwave heating device, or an LED irradiation heating device.

[0268] like Fig.26 As shown, after heating and curing, the welding conveying device 100 continues to convey the IBC battery string forward to the unloading station.

[0269] Optional, such as Fig. 27 As shown, the IBC battery string at the unloading station is transferred to the conveying line 300 of the typesetting conveyor by the transfer device.

[0270] Fourth embodiment

[0271] The IBC battery string welding method provided in this embodiment includes the following steps:

[0272] S41, obtaining N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons.

[0273] S42, stacking N adhesive film sheets and N+1 soldering ribbon groups on a welding conveyor according to a predetermined stacking rule, and placing N IBC battery cells with their backs facing downward on the N adhesive film sheets one by one, so that each adhesive film sheet adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string,

[0274] Among them, the predetermined stacking rules are:

[0275] The rear half of the first welding tape group is located on the first adhesive film sheet, and the front half of the first welding tape group is located on the welding conveying device; the rear half of the i-th welding tape group is located on the i-th adhesive film sheet, and the front half of the i-th welding tape group is located on the i-1-th adhesive film sheet, wherein i is an integer from 2 to N; the rear half of the N+1-th welding tape group is located on the welding conveying device, and the front half of the N+1-th welding tape group is located on the N-th adhesive film sheet.

[0276] It can be seen that the IBC battery string connection method provided in the embodiment of the present application uses a film sheet to bond the welding ribbon group to the corresponding battery cell. During the connection process, no thermal stress is concentrated on the back of the IBC battery cell, thereby avoiding bending, deformation, hidden cracks, and breakage of the IBC battery cell. In addition, the N+1 welding ribbon groups required for the string are prepared in advance and stacked on the N IBC battery cells at one time, which greatly improves the connection efficiency.

[0277] In this embodiment, the target battery string is formed by connecting N IBC battery cells in series through N+1 welding ribbon groups. In this embodiment, the pre-preparation of the N+1 welding ribbon groups is completed at one time, so that the prepared N+1 welding ribbon groups can be laid on the welding bearing part at one time, thereby improving the efficiency of stringing.

[0278] In this embodiment, the N+1 welding ribbon groups (such as Fig.28 The one-time preparation method of 13) is the same as that in the first embodiment, that is, the specific implementation method of step S41 is the same as that in the first embodiment, and will not be repeated here.

[0279] The welding conveying device in this embodiment can adopt the same structure as that in the first embodiment, and will not be described again here.

[0280] In the existing IBC battery string, two adjacent IBC battery cells are connected by a welding ribbon group. From the front of the IBC battery string, the welding ribbon group exposed at the inter-cell spacing between two adjacent IBC battery cells and the welding ribbons at the string head and string tail can be seen, which affects the integrity and aesthetics of the assembly. In order to solve this problem, this embodiment adjusts step S42, with the purpose of laying adhesive film strips at the inter-cell spacing of the IBC battery string and at the string head and string tail to cover the welding ribbon group.

[0281] To this end, the step S42 of this embodiment adds the laying of the adhesive film strip. Specifically, the step S42 can be implemented according to the following three optional implementation methods.

[0282] The first implementation method comprises the following steps:

[0283] S421, laying N adhesive film sheets onto the welding conveying device.

[0284] Optionally, the welding conveying device 100 fixes the N adhesive film sheets by adsorbing them through adsorption holes on the conveyor belt.

[0285] S422, stacking N+1 welding ribbon groups and N+1 adhesive film strips onto the N adhesive film sheets on the welding conveying device.

[0286] First, N+1 solder ribbon groups are stacked on N adhesive film sheets according to the above-mentioned predetermined stacking rule.

[0287] Then, Fig.30 As shown, the N+1 pre-prepared adhesive film strips are laid on the N adhesive film sheets. Specifically, among the laid N+1 adhesive film strips, the first adhesive film strip is stacked on the head of the first adhesive film sheet. The i-th adhesive film strip is placed on the head of the i-th adhesive film sheet and the tail of the i-1-th adhesive film sheet, where i is an integer from 2 to N; the N+1-th adhesive film strip is stacked on the tail of the N-th adhesive film sheet.

[0288] In this way, the welding strips between the adhesive film sheets, the welding strips on the head of the first adhesive film sheet, and the welding strips on the tail of the Nth adhesive film sheet are all covered by the adhesive film strips.

[0289] After executing step 422, if Fig.31 As shown, the adhesive film sheet, the welding ribbon group, and the adhesive film strip are stacked on the welding conveying device 100 from bottom to top.

[0290] S423, laying N IBC battery cells with their backs facing downward on the N adhesive film sheets one by one.

[0291] Optional, such as Fig.32 As shown in FIG. 1 , N IBC cells can be pre-arranged on the transfer platform with the back side facing downwards according to the string arrangement rule. Then the arranged N IBC cells are picked up from the transfer platform at one time, and the picked N IBC cells are placed as shown in FIG. Fig.33 As shown, they are placed one by one on the N adhesive film sheets on the welding conveyor device 100.

[0292] Of course, N IBC battery cells can also be laid one by one on the corresponding film sheets.

[0293] S424, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0294] Optionally, after N IBC battery cells are laid one by one with their backs facing down on N adhesive film sheets, the welding conveyor device heats the adhesive film sheets through a support plate in which a heating element is arranged, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0295] The second implementation method comprises the following steps:

[0296] S421. Pick up N+1 welding ribbon groups through the transport mechanism.

[0297] S422, picking up N pre-arranged adhesive film sheets through a transport mechanism, and making each adhesive film sheet picked up by the transport mechanism be located below a corresponding welding ribbon group.

[0298] The N pre-arranged film sheets are as follows: Fig.29 shown.

[0299] Optionally, the transport mechanism is provided with a solder ribbon pickup unit and an adhesive film adsorption unit, wherein the solder ribbon pickup unit is configured to be able to rise and fall in a vertical direction. The solder ribbon pickup unit picks up N+1 solder ribbon groups and then rises, so that the N+1 solder ribbon groups are located above the adhesive film adsorption unit. Subsequently, the adhesive film adsorption unit picks up N adhesive film sheets.

[0300] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0301] S423, the picked-up N+1 welding ribbon groups and N adhesive film sheets are simultaneously transported to the welding conveying device by the transport mechanism.

[0302] After being transported to the designated position, the N+1 solder ribbon groups are stacked on the N adhesive film sheets according to the above-mentioned predetermined stacking rule.

[0303] Optionally, the welding conveyor device 100 fixes the adhesive film sheet by adsorbing it through adsorption holes on the conveyor belt.

[0304] S424, stacking N+1 adhesive film strips on N adhesive film sheets, wherein: the first adhesive film strip is stacked on the head of the first adhesive film sheet. The i-th adhesive film strip is placed on the head of the i-th adhesive film sheet and the tail of the i-1-th adhesive film sheet, where i is an integer from 2 to N; the N+1-th adhesive film strip is stacked on the tail of the N-th adhesive film sheet, and each adhesive film strip is located above the corresponding welding tape group.

[0305] Optionally, N+1 film strips need to be prepared in advance and Fig.30 As shown, pre-arranged.

[0306] After executing step S424, Fig.31 As shown, the adhesive film sheet, the welding ribbon group, and the adhesive film strip are stacked on the welding conveying device 100 from bottom to top.

[0307] S425, placing N IBC battery cells with their backs facing downwards on the N adhesive film sheets on the welding conveyor device in a one-to-one correspondence.

[0308] Optional, such as Fig.32 As shown in FIG. 1 , N IBC battery cells can be pre-arranged on the transfer platform with their backs facing downwards according to the IBC battery string arrangement rules. Then the arranged N IBC battery cells are picked up from the transfer platform at one time, and the picked N IBC battery cells are placed as shown in FIG. Fig.33 As shown, they are laid one by one on the N adhesive film sheets on the welding conveyor device.

[0309] Of course, N IBC battery cells can also be laid one by one on the corresponding film sheets.

[0310] S426, heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

[0311] Optionally, after N IBC battery cells are laid one by one with their backs facing down on N adhesive film sheets, the welding conveyor device heats the adhesive film sheets through a support plate with a heating element installed therein, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0312] The third implementation method comprises the following steps:

[0313] S421. Pick up N+1 welding ribbon groups through the transport mechanism.

[0314] S422, picking up N pre-arranged adhesive film sheets through a transport mechanism, and making each adhesive film sheet picked up by the transport mechanism be located below a corresponding welding ribbon group.

[0315] The N pre-arranged film sheets are as follows: Fig.29 shown.

[0316] Optionally, the transport mechanism is provided with a solder ribbon pickup portion and an adhesive film adsorption portion, wherein the solder ribbon pickup portion is configured to be able to rise and fall in the vertical direction. The solder ribbon pickup portion picks up N+1 solder ribbon groups and then rises, so that the N+1 solder ribbon groups are located above the adhesive film adsorption portion. Subsequently, the adhesive film adsorption portion picks up N adhesive film sheets. The solder ribbon pickup portion then descends an appropriate distance, so that each adhesive film sheet is closely attached to the corresponding solder ribbon group.

[0317] Optionally, the solder strip picking portion is provided with a plurality of clamps for clamping the solder strip. The clamps are scissor-shaped structures, and are used to clamp the solder strip from both sides in the horizontal direction of the solder strip. The adhesive film adsorption portion includes an adsorption plate, and the adsorption plate is provided with adsorption holes connected to the negative pressure device.

[0318] S423, the picked-up N+1 welding ribbon groups and N adhesive film sheets are simultaneously transported to the welding conveying device by the transport mechanism.

[0319] A heating element is also provided in the adhesive film adsorption part. During the transportation process, the adhesive film adsorption part heats the adhesive film sheet through the heating element, so that the adhesive film sheet releases its stickiness in advance.

[0320] S424, stacking N+1 adhesive film strips on N adhesive film sheets, wherein: the first adhesive film strip is stacked on the head of the first adhesive film sheet. The i-th adhesive film strip is placed on the head of the i-th adhesive film sheet and the tail of the i-1-th adhesive film sheet, where i is an integer from 2 to N; the N+1-th adhesive film strip is stacked on the tail of the N-th adhesive film sheet, and each adhesive film strip is located above the corresponding welding tape group.

[0321] Optionally, N+1 film strips need to be prepared in advance and Fig.30 As shown, pre-arranged.

[0322] After executing step S424, Fig.31As shown, the adhesive film sheet, the welding ribbon group, and the adhesive film strip are stacked on the welding conveying device 100 from bottom to top.

[0323] S425, placing N IBC battery cells with their backs facing downward on the N adhesive film sheets on the welding conveyor device 100 one by one, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

[0324] Since the adhesive film is preheated during transportation, its viscosity has been released. Therefore, after N IBC battery cells are laid one by one on the N adhesive film sheets with their backs facing down, the adhesive film sheets will then bond the welding ribbon groups to the corresponding IBC battery cells.

[0325] Optional, such as Fig.32 As shown in FIG. 1 , N IBC battery cells can be pre-arranged on the transfer platform with their backs facing downwards according to the IBC battery string arrangement rules. Then the arranged N IBC battery cells are picked up from the transfer platform at one time, and the picked N IBC battery cells are placed as shown in FIG. Fig.33 As shown, they are laid one by one on the N adhesive film sheets on the welding conveyor device. Of course, the N IBC battery sheets can also be laid one by one on the corresponding adhesive film sheets.

[0326] like Fig.34 Optionally, after executing step S42, the IBC battery string welding method in the embodiment of the present application further includes:

[0327] Step S43: convey the IBC battery string to the bottom of the stringing device 200 by the welding conveying device 100; and heat and solidify the IBC battery string by the stringing device.

[0328] By heating and curing the IBC battery string through the stringing device 200, the adhesiveness of the adhesive film can be further released, so that the welding ribbon group is more firmly fixed to the corresponding IBC battery sheet. The stringing device 200 can be an infrared heating device, a hot pressing device, a hot air blowing device, a UV lamp device, a microwave heating device, or an LED irradiation heating device.

[0329] In one implementation, the adhesive film sheet is a transparent structure, the color of the adhesive film strip is black or can be selected according to the color of the front side of the battery cell, and the color of the adhesive film strip is consistent with the color of the battery cell.

[0330] After the heating and curing is completed, the welding conveying device 100 continues to convey the IBC battery string forward to the unloading station, and the transfer device transfers the IBC battery string at the unloading station to the conveying line 300 of the typesetting conveyor.

[0331] The present invention has been described in sufficient detail with certain particularity. It should be understood by those skilled in the art that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present invention should fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the claims, rather than by the above description in the embodiments.

Claims

1. A method for connecting IBC batteries in series, characterized in that: The IBC battery string connection method comprises: Obtaining N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons; Lay N IBC cells with their backs facing upward on a welding conveyor; N+1 solder ribbon groups and N adhesive film sheets are stacked on N IBC battery cells according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery cell to form an IBC battery string, wherein the predetermined stacking rule is: The second half of the first welding ribbon group is located on the first IBC battery cell, and the first half of the first welding ribbon group is located on the welding conveyor; the second half of the i-th welding ribbon group is located on the i-th IBC battery cell, and the first half of the i-th welding ribbon group is located on the i-1-th IBC battery cell, where i is an integer from 2 to N; the second half of the N+1-th welding ribbon group is located on the welding conveyor, and the first half of the N+1-th welding ribbon group is located on the N-th IBC battery cell; N adhesive film sheets are stacked one by one on the N IBC battery cells, and the welding ribbon group is located between the adhesive film sheets and the battery cells.

2. The IBC battery string connection method according to claim 1, characterized in that: The method of stacking the N+1 solder ribbon groups and the N adhesive film sheets on the N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, includes: Stack N+1 solder ribbon groups onto N IBC cells; Stacking N adhesive film sheets onto N IBC battery sheets; heating N adhesive film sheets so that each adhesive film sheet adheres the welding ribbon group to the corresponding battery sheet to form an IBC battery string; or, The method of stacking the N+1 solder ribbon groups and the N adhesive film sheets on the N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, includes: Pick up N pre-arranged film sheets through a transport mechanism; Picking up N+1 solder ribbon groups by the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet; The transport mechanism simultaneously transports the picked-up N adhesive film sheets and N+1 solder ribbon groups to the N IBC battery sheets; Heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string; or, The method of stacking the N+1 solder ribbon groups and the N adhesive film sheets on the N IBC battery sheets according to a predetermined stacking rule, so that each adhesive film sheet adheres the corresponding solder ribbon group to the corresponding battery sheet to form an IBC battery string, includes: Pick up N pre-arranged film sheets through a transport mechanism; Picking up N+1 solder ribbon groups by the transport mechanism, so that each solder ribbon group picked up by the transport mechanism is located below the corresponding adhesive film sheet and is in close contact with the corresponding adhesive film sheet; The transport mechanism transports N adhesive film sheets and N+1 soldering ribbon groups to N IBC battery cells at the same time. The N adhesive film sheets are heated during the transport process so that each adhesive film sheet adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string.

3. The IBC battery string connection method according to claim 1, characterized in that: The obtaining of N+1 welding ribbon groups includes: Pull out multiple parallel welding strips; An odd-numbered welding strip group consisting of all odd-numbered welding strips and an even-numbered welding strip group consisting of all even-numbered welding strips are staggered in the length direction of the welding strips; Alternately cutting off the staggered odd-numbered welding ribbon groups and even-numbered welding ribbon groups; All the cut odd-numbered welding ribbon groups and even-numbered welding ribbon groups are separated along the length direction of the welding ribbons to obtain N+1 welding ribbon groups.

4. The IBC battery string connection method according to claim 1, characterized in that: The method of placing N IBC battery sheets with their backs facing upward on a welding conveyor device comprises: Arrange N IBC cells on the transfer platform with their backs facing upwards; Pick up the arranged N IBC battery sheets from the transfer platform, and place the picked N IBC battery sheets on the welding conveyor device.

5. The IBC battery string connection method according to claim 4, characterized in that: Before picking up the arranged N IBC battery sheets from the transfer platform, the IBC battery string connection method further includes: According to the stacking rules of the film strips, N+1 film strips are stacked on the N arranged IBC battery cells on the transfer platform; or, Before stacking the N+1 solder ribbon groups and the N adhesive film sheets on the N IBC battery sheets according to a predetermined stacking rule, the IBC battery string connection method further includes: According to the film strip stacking rule, N+1 film strips are stacked on the N IBC battery cells on the welding conveyor device; Among them, the stacking rule of the film strips is: the first film strip is stacked on the head of the first IBC battery cell; the i-th film strip is overlapped on the head of the i-th IBC battery cell and the tail of the i-1-th IBC battery cell, where i is an integer from 2 to N; the N+1-th film strip is stacked on the tail of the N-th IBC battery cell.

6. The IBC battery string connection method according to claim 2, characterized in that: The welding conveyor device is provided with a heating element, which is used to heat the N adhesive film sheets laid on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

7. The IBC battery string connection method according to any one of claims 1 to 6, characterized in that: After stacking the N+1 solder ribbon groups and the N adhesive film sheets on the N IBC battery sheets according to a predetermined stacking rule, the IBC battery string connection method further includes: The IBC battery string is conveyed to the bottom of the stringing device by the welding conveying device; The string-forming device is used to heat and solidify the IBC battery string.

8. A method for connecting IBC batteries in series, characterized in that: The IBC battery string connection method comprises: Obtaining N+1 welding ribbon groups, wherein two adjacent welding ribbon groups are staggered by a predetermined distance in the length direction of the welding ribbons, and the welding ribbons in two adjacent welding ribbon groups are staggered in the width direction of the welding ribbons; N adhesive films and N+1 soldering ribbon groups are stacked on a welding conveyor according to a predetermined stacking rule, and N IBC battery cells are laid one by one on the N adhesive films with their backs facing downward, so that each adhesive film adheres the corresponding soldering ribbon group to the corresponding battery cell to form an IBC battery string. Wherein, the predetermined stacking rule is: The rear half of the first welding tape group is located on the first adhesive film sheet, and the front half of the first welding tape group is located on the welding conveying device; the rear half of the i-th welding tape group is located on the i-th adhesive film sheet, and the front half of the i-th welding tape group is located on the i-1-th adhesive film sheet, wherein i is an integer from 2 to N; the rear half of the N+1-th welding tape group is located on the welding conveying device, and the front half of the N+1-th welding tape group is located on the N-th adhesive film sheet.

9. The IBC battery string connection method according to claim 8, characterized in that: The method comprises: stacking N adhesive film sheets and N+1 welding ribbon groups on a welding conveyor according to a predetermined stacking rule, and placing N IBC battery sheets on the N adhesive film sheets one by one with their backs facing downward, so that each adhesive film sheet bonds the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string, including: Laying N pieces of adhesive film onto the welding conveyor device; Stacking N+1 welding ribbon groups onto the N adhesive film sheets on the welding conveyor device; Lay N IBC battery sheets on N adhesive film sheets one by one with their backs facing downward; heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string; or, The method comprises: stacking N adhesive film sheets and N+1 welding ribbon groups on a welding conveyor according to a predetermined stacking rule, and placing N IBC battery sheets on the N adhesive film sheets one by one with their backs facing downward, so that each adhesive film sheet bonds the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string, including: Pick up N+1 welding ribbon groups through the handling mechanism; The transport mechanism picks up N pre-arranged adhesive film sheets, and each adhesive film sheet picked up by the transport mechanism is located below a corresponding welding ribbon group; The picked-up N+1 welding ribbon groups and N adhesive film sheets are simultaneously transported to the welding conveying device by the transport mechanism; Laying N IBC battery sheets with their backs facing downwards one by one on the N adhesive film sheets on the welding conveyor device; heating N adhesive film sheets so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string; or, The method comprises: stacking N adhesive film sheets and N+1 welding ribbon groups on a welding conveyor according to a predetermined stacking rule, and placing N IBC battery sheets on the N adhesive film sheets one by one with their backs facing downward, so that each adhesive film sheet bonds the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string, including: Pick up N+1 welding ribbon groups through the handling mechanism; The transport mechanism picks up N pre-arranged adhesive film sheets, so that each adhesive film sheet picked up by the transport mechanism is located below the corresponding soldering tape group and is close to the corresponding soldering tape group; The N adhesive film sheets and N+1 soldering tape groups are simultaneously transported to the welding conveying device by the transporting mechanism, and the N adhesive film sheets are heated during the transporting process so that the soldering tape groups are pre-bonded to the corresponding adhesive film sheets; N IBC battery cells are laid one by one with their backs facing downward on the N adhesive film sheets on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery cell to form an IBC battery string.

10. The IBC battery string connection method according to claim 9, characterized in that: The step of placing N adhesive film sheets on the welding conveying device comprises: Arrange N pieces of film in advance; Pick up N pre-arranged adhesive film sheets, and place the N adhesive film sheets on the welding conveying device.

11. The IBC battery string connection method according to claim 9, characterized in that: The welding conveyor device is provided with a heating element, which is used to heat the N adhesive film sheets laid on the welding conveyor device, so that each adhesive film sheet adheres the corresponding welding ribbon group to the corresponding battery sheet to form an IBC battery string.

12. The IBC battery string connection method according to claim 9, characterized in that: The obtaining of N+1 welding ribbon groups includes: Pull out multiple parallel welding strips; An odd-numbered welding strip group consisting of all odd-numbered welding strips and an even-numbered welding strip group consisting of all even-numbered welding strips are staggered in the length direction of the welding strips; Alternately cutting off the staggered odd-numbered welding ribbon groups and even-numbered welding ribbon groups; All the cut odd-numbered welding ribbon groups and even-numbered welding ribbon groups are separated along the length direction of the welding ribbons to obtain N+1 welding ribbon groups.

13. The IBC battery string connection method according to claim 8, characterized in that: Before placing the N IBC battery sheets with their backs facing downwards one by one on the N adhesive film sheets, the IBC battery string connection method further includes: Stack N+1 film strips on N film sheets, where: the 1st film strip is stacked on the head of the 1st film sheet; the i-th film strip is overlapped on the head of the i-th film sheet and the tail of the i-1-th film sheet, where i is an integer from 2 to N; the N+1th film strip is stacked on the tail of the Nth film sheet, and each film strip is located above the corresponding welding tape group.

14. The IBC battery string connection method according to claim 8, characterized in that: The method of placing N IBC battery sheets with their backs facing downwards on N adhesive film sheets in a one-to-one correspondence includes: According to the string arrangement rules, N IBC cells are pre-arranged on the transfer platform with the back side facing downwards; Pick up the arranged N IBC battery sheets from the transfer platform, and place the picked N IBC battery sheets one by one on the N adhesive film sheets on the welding conveyor device.

15. The IBC battery string connection method according to any one of claims 8 to 14, characterized in that: After placing the N IBC battery sheets with their backs facing downwards one by one on the N adhesive film sheets, the IBC battery string connection method further includes: The IBC battery string is conveyed to the bottom of the stringing device by the welding conveying device; The string-forming device is used to heat and solidify the IBC battery string.

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