Battery string, connection method and device thereof

Abstract

The present application discloses a battery string and its serial connection method and serial connection device, the battery string includes a predetermined number of battery cells, at least one group of welding strips for connecting two adjacent battery cells in series, a head end transverse welding strip and a tail end transverse welding strip, each group of welding strips includes n welding strips arranged in parallel and aligned, the head end transverse welding strip and the tail end transverse welding strip are respectively vertically overlapped on the head end and the tail end of each welding strip of the same group of welding strips, the front half of each group of welding strips and the overlapped head end transverse welding strip are laid on the front main grid line of the front battery cell in the two adjacent battery cells, and the rear half of each group of welding strips and the overlapped tail end transverse welding strip are laid below the back main grid line of the rear battery cell in the two adjacent battery cells. The present application improves the fixation of the welding strip by vertically overlapping the transverse welding strip at least at the head end and the tail end of the welding strip group, when the welding area of ​​the battery cell is small, and greatly reduces the situation of false welding and desoldering of the welding strip.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic assembly production, and relates to a battery string and a string connection method and a string connection device. Background Art

[0002] In order to reduce the cost of silver paste, the welding area on the main grid of the battery cell is now more and more dispersed. When the battery cells are connected in series through the welding ribbon, it is easy to have loose welding and the welding ribbon is easy to loosen, resulting in cold welding and desoldering.

[0003] How to improve the welding stability between the soldering ribbon and the battery cell is a technical problem that needs to be solved at present. Summary of the invention

[0004] In order to solve the problems in the related art, the present application provides a battery string and a string connection method and a string connection device thereof, and the technical solution is as follows:

[0005] In a first aspect, the present application provides a battery string, the battery string comprising a predetermined number of battery cells, at least one group of welding strips for connecting two adjacent battery cells in series, a head end transverse welding strip corresponding to the head end of each group of welding strips, and a tail end transverse welding strip corresponding to the tail end of each group of welding strips, each group of welding strips comprising n welding strips arranged in parallel and aligned, wherein:

[0006] The head end transverse welding strip corresponding to each group of welding strips is vertically overlapped on the head end of each welding strip of the same group of welding strips, and the tail end transverse welding strip corresponding to each group of welding strips is vertically overlapped on the tail end of each welding strip of the same group of welding strips. The front half of each group of welding strips and the overlapped head end transverse welding strips are laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding strips and the overlapped tail end transverse welding strips are laid below the back main grid line of the rear battery cell between the two adjacent battery cells.

[0007] By vertically overlapping the transverse welding strips at least at the head and tail ends of the welding strip group, the fixation of the welding strips is improved when the welding area of ​​the battery cell is small, and the situation of cold welding and desoldering of the welding strips is greatly reduced.

[0008] Optionally, the length of the head end transverse welding strip is the same as the length of the tail end transverse welding strip.

[0009] Optionally, the front main grid lines and the back main grid lines of the battery cell are both formed with spaced welding areas; or,

[0010] A welding area is formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and a welding area is formed on the leading end and / or the trailing end of the main grid line on the back side of the cell; or,

[0011] The leading end of the odd-numbered busbars on the front of the cell forms a welding area, the trailing end of the even-numbered busbars on the front of the cell forms a welding area, the trailing end of the odd-numbered busbars on the back of the cell forms a welding area, and the leading end of the even-numbered busbars on the back of the cell forms a welding area; or,

[0012] The tail ends of the odd-numbered main grid lines on the front of the battery cell form a welding area, the leading ends of the even-numbered main grid lines on the front of the battery cell form a welding area, the leading ends of the odd-numbered main grid lines on the back of the battery cell form a welding area, and the tail ends of the even-numbered main grid lines on the back of the battery cell form a welding area.

[0013] Optionally, the middle of each welding strip is flattened, and two adjacent battery cells are stacked at adjacent edges; or,

[0014] The middle of each welding strip is bent, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance; or,

[0015] Each welding ribbon is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0016] Optionally, the battery cell is a whole battery cell or a battery slice formed by slicing a whole battery cell.

[0017] In a second aspect, the present application further provides a battery string connection method, the battery string connection method comprising:

[0018] Pulling the welding ribbon and cutting it to form an i-th group of welding ribbons, wherein the i-th group of welding ribbons includes at least n welding ribbons that are parallel and aligned;

[0019] The head ends of the n welding strips in the i-th group of welding strips are vertically overlapped with the i-th head end transverse welding strip, and the tail ends of the n welding strips in the i-th group of welding strips are vertically overlapped with the i-th tail end transverse welding strip;

[0020] Laying the front half of the i-th group of welding strips overlapped with the i-th head-end transverse welding strip on the front main grid line of the i-th solar cell;

[0021] Synchronously conveying the i-th cell and the i-th group of welding ribbons forward, laying the i+1-th cell on the rear half of the i-th group of welding ribbons overlapped with the i-th tail end transverse welding ribbon, and continuing the steps of pulling the welding ribbons and cutting to form the i-th group of welding ribbons until the predetermined number of cells are laid;

[0022] The predetermined number of cells and welding ribbons laid out are welded.

[0023] By vertically overlapping the transverse welding strips at least at the head and tail ends of the welding strip group, the fixation of the welding strips is improved when the welding area of ​​the battery cell is small, and the situation of cold welding and desoldering of the welding strips is greatly reduced.

[0024] Optionally, the pulling the welding strips and cutting to form the i-th group of welding strips comprises:

[0025] Pulling n+2 welding strips, and cutting the pulled n+2 welding strips with a dislocation cutter to form n welding strips of the same length and two transverse welding strips, wherein the centers of the n welding strips are all located on the same straight line;

[0026] The step of vertically overlapping the i-th head end transverse welding strip at the head ends of the n welding strips in the i-th group of welding strips, and vertically overlapping the i-th tail end transverse welding strip at the tail ends of the n welding strips in the i-th group of welding strips, comprises:

[0027] Rotate two transverse welding strips in the i-th group of welding strips to be perpendicular to the remaining n welding strips;

[0028] The two rotated transverse welding strips are respectively used as the i-th head end transverse welding strip and the i-th tail end transverse welding strip, and are vertically overlapped with the head end and tail end of the n welding strips of the i-th group of welding strips.

[0029] Optionally, after rotating two transverse welding strips in the i-th group of welding strips to be perpendicular to the remaining n welding strips, the battery string connection method further includes:

[0030] Preheat the two rotated horizontal welding strips.

[0031] By preheating the transverse soldering strip, the firmness of the transverse soldering strip when vertically overlapping the head end and the tail end of the soldering strip group is ensured.

[0032] In a third aspect, the present application further provides a battery string connection method, the battery string connection method comprising:

[0033] Pulling the welding ribbon along a first direction and cutting it to form an i-th group of welding ribbons, wherein the i-th group of welding ribbons includes n welding ribbons that are parallel and aligned;

[0034] Pulling the welding strip along a second direction and cutting it to form a group of transverse welding strips corresponding to the i-th group of welding strips, wherein the group of transverse welding strips includes at least two parallel and aligned transverse welding strips, and the second direction is perpendicular to the first direction;

[0035] The two outermost welding strips of the transverse welding strips are overlapped at the head end and the tail end of the i-th group of welding strips respectively, and the other transverse welding strips are overlapped evenly between the head end and the tail end of the i-th group of welding strips;

[0036] Laying the front half of the i-th group of welding ribbons overlapped with the transverse welding ribbons on the front main grid line of the i-th solar cell;

[0037] Synchronously conveying the i-th cell and the i-th group of welding strips overlapped with the transverse welding strips forward, laying the i+1-th cell on the rear half of the i-th group of welding strips overlapped with the transverse welding strips, and continuing to perform the steps of pulling the welding strips along the first direction and cutting to form the i-th group of welding strips, until the predetermined number of cells are laid;

[0038] The predetermined number of cells and welding ribbons laid out are welded.

[0039] By vertically overlapping the transverse welding strips at least at the head and tail ends of the welding strip group, the fixation of the welding strips is improved when the welding area of ​​the battery cell is small, and the situation of cold welding and desoldering of the welding strips is greatly reduced.

[0040] Optionally, after the welding strip is pulled along the second direction and cut to form a group of transverse welding strips corresponding to the i-th group of welding strips, the battery string connection method further includes: preheating the transverse welding strips.

[0041] By preheating the transverse soldering strip, the firmness of the transverse soldering strip when vertically overlapping the head end and the tail end of the soldering strip group is ensured.

[0042] In a fourth aspect, the present application further provides a battery string connection device, the battery string connection device comprising a welding ribbon feeding device, a welding ribbon pulling device, a welding ribbon cutting device, a welding ribbon rotating laying device, a first battery cell feeding device, a first conveying device and a first welding device, wherein:

[0043] The welding ribbon feeding device provides a group of welding ribbons;

[0044] The welding tape pulling device pulls out a group of welding tapes from the welding tape feeding device, and the pulled welding tapes pass through the welding tape cutting device in sequence;

[0045] The welding strip cutting device cuts the welding strip pulled out by the welding strip pulling device to form n welding strips of the same length and two transverse welding strips;

[0046] The welding strip rotating and laying device rotates the two transverse welding strips and lays them vertically at the head end and the tail end of the n welding strips of the same length as the head end transverse welding strip and the tail end transverse welding strip respectively;

[0047] The first cell feeding device, the welding tape pulling device and the welding tape rotating laying device cooperate to stack the cells and the welding tape groups with the head end transverse welding tape and the tail end transverse welding tape vertically overlapped at the head end and the tail end respectively, on the first conveying device, so that the front half of each group of welding tapes is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each group of welding tapes is laid below the rear main grid line of the rear cell of the two adjacent cells;

[0048] The first conveying device conveys the stacked battery cells and welding ribbons to the first welding device for welding.

[0049] By vertically overlapping the transverse welding strips at least at the head and tail ends of the welding strip group, the fixation of the welding strips is improved when the welding area of ​​the battery cell is small, and the situation of cold welding and desoldering of the welding strips is greatly reduced.

[0050] Optionally, the solder strip rotary laying device comprises a solder strip picking-up unit and a preheating unit, wherein the solder strip picking-up unit is configured to pick up the solder strip, and the preheating unit is configured to preheat the picked-up solder strip; or,

[0051] The welding tape pulling device comprises n pulling heads and two pulling rotating heads respectively located at two ends of the n pulling heads, the n pulling heads and the two pulling rotating heads pull a group of welding tapes at the same time, after the welding tape cutting device cuts the group of welding tapes into n welding tapes and two transverse welding tapes of the same length, the two pulling rotating heads respectively rotate the two transverse welding tapes to be perpendicular to the n welding tapes and preheat the two transverse welding tapes.

[0052] By preheating the transverse soldering strip, the firmness of the transverse soldering strip when vertically overlapping the head end and the tail end of the soldering strip group is ensured.

[0053] Optionally, the welding ribbon cutting device includes a first group of blades and a second group of blades and a third group of blades connected to the first group of blades, wherein the second group of blades and the third group of blades are respectively arranged at two ends of the first group of blades and located on the same side of the first group of blades.

[0054] By configuring the blades of the welding strip cutting device in a special shape, three sets of blades can cooperate to simultaneously cut out two horizontal welding strips and n long welding strips, thereby improving the efficiency of welding strip cutting and saving the cost of welding strip cutting.

[0055] Optionally, the battery string connection device further includes a waste recovery device, which is disposed on the side of the solder strip cutting device and is used to recover waste generated when the solder strip cutting device cuts to form the two transverse solder strips.

[0056] By setting up a waste recovery device, the waste generated when cutting two horizontal welding strips can be recovered to ensure the normal operation of the equipment.

[0057] In a fifth aspect, the present application further provides a battery string connection device, the battery string connection device comprising a first solder strip feeding device, a second solder strip feeding device, a first solder strip traction device, a second solder strip traction device, a first solder strip cutting device, a second solder strip cutting device, a second battery cell feeding device, a second conveying device, and a second welding device, wherein:

[0058] The first welding tape feeding device provides a group of welding tapes, the first welding tape pulling device pulls out a group of welding tapes from the first welding tape feeding device along a first direction, and the pulled welding tapes pass through the first welding tape cutting device in sequence; the first welding tape cutting device cuts the welding tape pulled out by the first welding tape pulling device to form n parallel welding tapes of the same length; the first pulling device lays the n parallel welding tapes of the same length on the conveying device;

[0059] The second welding tape feeding device provides a group of welding tapes, the second welding tape pulling device pulls out a group of transverse welding tapes from the second welding tape feeding device along a second direction perpendicular to the first direction, and the pulled transverse welding tapes pass through the second welding tape cutting device in sequence; the second welding tape cutting device cuts the transverse welding tape pulled out by the second welding tape pulling device to form at least two parallel transverse welding tapes of the same length; the second pulling device vertically overlaps the at least two parallel transverse welding tapes of the same length at the head end, the tail end, and between the head end and the tail end of the n parallel welding tapes of the same length;

[0060] The second cell feeding device, the first welding strip feeding device, the second welding strip feeding device, the first welding strip pulling device, the second welding strip pulling device, the first welding strip cutting device and the second welding strip cutting device cooperate to stack the cells and the welding strip groups vertically overlapped with the transverse welding strips on the second conveying device, so that the front half of each welding strip group is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each welding strip group is laid below the rear main grid line of the rear cell of the two adjacent cells;

[0061] The second conveying device conveys the stacked battery cells and welding ribbons to the second welding device for welding.

[0062] By vertically overlapping the transverse welding strips at least at the head and tail ends of the welding strip group, the fixation of the welding strips is improved when the welding area of ​​the battery cell is small, and the situation of cold welding and desoldering of the welding strips is greatly reduced.

[0063] Optionally, the second welding strip pulling device includes a pulling portion and a preheating portion, the pulling portion is configured to pull the transverse welding strip, and the preheating portion is configured to preheat the pulled transverse welding strip.

[0064] By preheating the transverse soldering strip, the firmness of the transverse soldering strip when vertically overlapping the head end and the tail end of the soldering strip group is ensured.

[0065] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0067] Figure 1 is a schematic diagram of a battery string provided in one embodiment of the present application;

[0068] Figure 2 It is a schematic diagram of overlapping transverse welding strips at the head end and the tail end of the welding strip group provided in one embodiment of the present application;

[0069] Figure 3A is a schematic diagram of the arrangement of welding areas on a battery cell provided in one embodiment of the present application;

[0070] Figure 3B is a schematic diagram of the arrangement of welding areas on a battery cell provided in another embodiment of the present application;

[0071] Figure 3C is a schematic diagram of the arrangement of welding areas on a battery cell provided in yet another embodiment of the present application;

[0072] Figure 4 It is a flow chart of a battery string connection method provided in one embodiment of the present application;

[0073] Figure 5 is a flow chart of a battery string connection method provided in another embodiment of the present application;

[0074] Fig. 6A It is a structural schematic diagram of a battery string connection device provided in one embodiment of the present application;

[0075] Figure 6B is a structural schematic diagram of a welding ribbon cutting device provided in one embodiment of the present application;

[0076] Figure 7 It is a structural schematic diagram of a battery string connection device provided in another embodiment of the present application.

[0077] The reference numerals are as follows:

[0078] 11. The front battery cell; 12. The rear battery cell; 13. The welding area; 20. The welding strip; 21. The head end transverse welding strip; 22. The tail end transverse welding strip; 61. The welding strip feeding device; 62. The welding strip pulling device; 63. The welding strip cutting device; 631. The first set of blades; 632. The second set of blades; 633. The third set of blades; 64. The welding strip rotating laying device; 65. The first battery cell feeding device; 66. The first conveying device; 67. The first welding device; 71. The first welding strip feeding device; 72. The second welding strip feeding device; 73. The first welding strip pulling device; 74. The second welding strip pulling device; 75. The first welding strip cutting device; 76. The second welding strip cutting device; 77. The second battery cell feeding device; 78. The second conveying device; 79. The second welding device. DETAILED DESCRIPTION

[0079] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0080] Figure 1 is a schematic diagram of a battery string provided in one embodiment of the present application. In order to reduce the visual impact of overlap, Figure 1 Only two battery cells are shown in series. The battery string provided in the present application may include a predetermined number of battery cells, at least one group of welding strips 20 for connecting two adjacent battery cells in series, a head end transverse welding strip 21 corresponding to the head end of each group of welding strips, and a tail end transverse welding strip 22 corresponding to the tail end of each group of welding strips, and each group of welding strips includes n welding strips 20 arranged in parallel and aligned.

[0081] The head end transverse welding strip 21 corresponding to each group of welding strips is vertically overlapped on the head end of each welding strip 20 of the same group of welding strips, and the tail end transverse welding strip 22 corresponding to each group of welding strips is vertically overlapped on the tail end of each welding strip 20 of the same group of welding strips. The front half of each group of welding strips and the overlapping head end transverse welding strip 21 are laid on the front main grid line of the front battery cell 11 in the two adjacent battery cells, and the rear half of each group of welding strips and the overlapping tail end transverse welding strip 22 are laid below the back main grid line of the rear battery cell 12 in the two adjacent battery cells.

[0082] Usually, the number of welding ribbons 20 in each group is the same, for example, the number of welding ribbons 20 in each group can be 3, 4, 5, 6, 9, 12, 15, 16, etc. The number of welding ribbons 20 in each group is the same as the number of single-sided main grid lines on the battery cell. The number of welding ribbons in each group is not limited in the present application. In principle, battery cells with different numbers of main grids can all be connected in series using the idea of ​​the special-shaped structure of the welding ribbon end in the present application.

[0083] In some embodiments, the length of the leading end transverse welding strip 21 is the same as the length of the trailing end transverse welding strip 22. Figure 1 As shown, the length of the transverse welding strip (the head end transverse welding strip 21 and the tail end transverse welding strip 22) is less than the length of a single welding strip in each group of welding strips. Depending on the size of the battery cell, for example, when the battery cell adopts three-piece or four-piece slices, the length of a single welding strip in each group of welding strips laid on the main grid line is less than the length of the transverse welding strip, that is, the length of the transverse welding strip is greater than the length of a single welding strip in each group of welding strips. Of course, for battery cells of special sizes, it is also possible that the length of the transverse welding strip is equal to the length of a single welding strip in each group of welding strips. In the present application, the length of the transverse welding strip can be flexibly selected according to battery cells of different sizes, and there is no specific restriction on the length of the transverse welding strip.

[0084] Take the example that each group of welding strips includes 5 welding strips, that is, the number n of each group of welding strips 20 is 5. Figure 2 As shown. Figure 2 In the figure, the lengths of the single welding strips in each group of welding strips 20 are the same and are longer than the lengths of the head end transverse welding strip 21 and the tail end transverse welding strip 22. The two ends of each group of welding strips 20 are vertically overlapped with the head end transverse welding strip 21 and the tail end transverse welding strip 22 respectively.

[0085] In a possible implementation, the length of the head end transverse welding strip 21 and the tail end transverse welding strip 22 should be sufficient to cross over and overlap the two outermost welding strips of the corresponding group welding strip. In this way, it can be ensured that the head end transverse welding strip 21 and the tail end can be overlapped to the adjacent welding strip, which better ensures the support of the end of the welding strip.

[0086] The welding area 13 on the battery cell in the battery string provided in this application is specially designed. Figure 3A-3C .

[0087] exist Figure 3A In the embodiment, the front main grid line and the back main grid line of the battery cell are both formed with spaced welding areas, and the spacing between these spaced welding areas can be the same or different. Figure 3AIn the figure, multiple welding areas 13 (indicated by solid lines) are shown on the front side of the front cell 11, and multiple welding areas 13 (indicated by dotted lines) are shown on the back side of the rear cell 12. Figure 3A The arrangement of the back welding area of ​​the rear battery cell 12 is the same, and the front welding area of ​​the rear battery cell 12 and Figure 3A The arrangement of the front welding area of ​​the front battery cell 11 is the same.

[0088] A welding area is formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and a welding area is formed on the leading end and / or the trailing end of the main grid line on the back side of the cell. Figure 3B In the embodiment, welding areas 13 are formed on the leading ends of the front main grid lines of the battery cells 11 and 12, and welding areas 13 are formed on the trailing ends of the back main grid lines of the battery cells 11 and 12.

[0089] exist Figure 3C In the figure, the leading ends of the odd-numbered main grid lines on the front of the battery cell 11 and the battery cell 12 form a welding area 13, the trailing ends of the even-numbered main grid lines on the front of the battery cell 11 and the battery cell 12 form a welding area 13, the trailing ends of the odd-numbered main grid lines on the back of the battery cell 11 and the battery cell 12 form a welding area 13, and the leading ends of the even-numbered main grid lines on the back of the battery cell 11 and the battery cell 12 form a welding area 13. Figure 3C In the figure, the front welding area 13 is represented by a solid line frame, and the back welding area 13 is represented by a dotted line frame.

[0090] In another possible implementation, a welding area is formed at the tail end of the odd-numbered main bus lines on the front side of the battery cell, a welding area is formed at the head end of the even-numbered main bus lines on the front side of the battery cell, a welding area is formed at the head end of the odd-numbered main bus lines on the back side of the battery cell, and a welding area is formed at the tail end of the even-numbered main bus lines on the back side of the battery cell.

[0091] It should be noted that the above Figure 3A-3C The solid-line box represents the welding area 13 on the front side of the front battery cell 11, and the dotted-line box represents the welding area 13 on the back side of the rear battery cell 12. In practice, welding areas are set on the front and back sides of each battery cell, and the setting positions of the welding areas of each battery cell are usually the same.

[0092] In a possible implementation, in order to further improve the photoelectric conversion efficiency of the battery string, the adjacent edges of two adjacent battery cells are stacked, and accordingly, the middle position of each welding strip 20 in the present application needs to be flattened.

[0093] In another possible implementation, the middle position of each welding strip 20 is bent, and adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0094] In another possible implementation, each welding ribbon 20 is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0095] The battery cell provided in the present application may be a whole battery cell or a battery slice formed by slicing a whole battery cell. The battery slice may be obtained by slicing a standard whole battery cell, such as the common two-slice, three-slice, four-slice, five-slice, etc. Figure 1 , Figure 3A-3C The examples are all based on two-piece slicing, and the specifications of battery slicing are not limited in this application.

[0096] In summary, the battery string provided in the present application improves the fixation of the soldering strips by vertically overlapping the transverse soldering strips at least at the head and tail ends of the soldering strip group, and greatly reduces the occurrence of solder joint failure and desoldering of the soldering strips when the soldering area of ​​the battery cell is small.

[0097] In addition, when the welding area at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding area on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0098] In order to achieve Figure 1 The present application provides two battery string connection methods for producing battery strings. One method is to realize the feeding of n welding strips and the head end transverse welding strip and the tail end transverse welding strip of each group by setting a set of welding strip pulling devices and welding strip cutting devices; the other method is to realize the feeding of n welding strips and the head end transverse welding strip and the tail end transverse welding strip of each group by setting two sets of welding strip pulling devices and welding strip cutting devices. These two methods are respectively realized by Figure 4 and Figure 5 Provide explanation.

[0099] Figure 4 1 is a flow chart of a battery string connection method provided in one embodiment of the present application. The battery string connection method provided in the present application may include the following steps:

[0100] Step 401, pulling the welding ribbon and cutting it to form the i-th group of welding ribbons;

[0101] The i-th group of welding ribbons mentioned here includes at least n welding ribbons that are arranged in parallel and aligned.

[0102] Step 402, vertically overlap the i-th head end transverse welding strip at the head ends of the n welding strips in the i-th group of welding strips, and vertically overlap the i-th tail end transverse welding strip at the tail ends of the n welding strips in the i-th group of welding strips;

[0103] When implementing step 401, firstly, n+2 welding strips are pulled, that is, the same welding strip pulling device can be used to pull out n+2 welding strips at the same time; then, the pulled n+2 welding strips are cut by using an offset cutter to form n welding strips of the same length and two transverse welding strips, and the centers of each welding strip in the n welding strips are located on the same straight line. The cut n+2 welding strips are as follows: Figure 2 shown.

[0104] Correspondingly, when implementing step 402, first, the two transverse welding strips in the i-th group of welding strips are respectively rotated to be perpendicular to the remaining n welding strips; then the two rotated transverse welding strips are respectively used as the i-th leading end transverse welding strip and the i-th trailing end transverse welding strip, and are vertically overlapped with the leading end and the trailing end of the n welding strips in the i-th group of welding strips.

[0105] Optionally, in order to improve the fixation of the two transverse welding strips and the n welding strips, after the two transverse welding strips in the i-th group of welding strips are respectively rotated to be perpendicular to the remaining n welding strips, the rotated two transverse welding strips are preheated.

[0106] Step 403, laying the front half of the i-th group of welding ribbons overlapped with the i-th head-end transverse welding ribbon on the front main grid line of the i-th solar cell;

[0107] Step 404, synchronously conveying the i-th cell and the i-th group of welding ribbons forward, and laying the i+1-th cell on the rear half of the i-th group of welding ribbons overlapped with the i-th tail end transverse welding ribbon, i+1;

[0108] Typically, after laying the i+1th battery cell on the rear half of the i-th group of welding strips overlapped with the i-th tail end transverse welding strip, it can be determined whether i reaches a predetermined number. If it does not reach the predetermined number, i+1 is added, and then the steps of pulling the welding strips and cutting to form the i-th group of welding strips are continued.

[0109] Step 405, when the predetermined number of battery cells are laid, the predetermined number of battery cells and welding ribbons are welded.

[0110] When it is determined that i reaches a predetermined number, it can be understood that the laying of the predetermined number of battery cells is completed, and at this time, the laid predetermined number of battery cells and welding ribbons are welded.

[0111] In summary, the battery string connection method provided in the present application improves the fixation of the soldering strips by vertically overlapping the transverse soldering strips at least at the head and tail ends of the soldering strip group, and greatly reduces the occurrence of cold soldering and desoldering of the soldering strips when the soldering area of ​​the battery cell is small.

[0112] In addition, when the welding area at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding area on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0113] See also Figure 5 FIG. 2 is a flow chart of a method for connecting battery strings in series provided in another embodiment of the present application. The method for connecting battery strings in series provided in the present application may include the following steps:

[0114] Step 501, pulling the welding ribbon along a first direction and cutting it to form an i-th group of welding ribbons;

[0115] The i-th group of welding ribbons mentioned here may include n welding ribbons arranged in parallel and aligned.

[0116] Step 502, pulling the welding strip along the second direction and cutting to form a group of transverse welding strips corresponding to the i-th group of welding strips;

[0117] Each group of transverse welding strips includes at least two transverse welding strips that are arranged in parallel and aligned, and the second direction is perpendicular to the first direction.

[0118] After the welding strip is pulled along the second direction and cut to form a group of transverse welding strips corresponding to the i-th group of welding strips, the transverse welding strips may be preheated to improve the fixation of the transverse welding strips when overlapping the i-th group of welding strips.

[0119] Step 503, overlap the two outermost welding strips of the transverse welding strip at the head end and the tail end of the i-th group of welding strips respectively, and evenly overlap the other transverse welding strips between the head end and the tail end of the i-th group of welding strips;

[0120] It should be noted that in step 502, when a group of transverse welding strips pulled out along the second direction is 2, the 2 transverse welding strips are overlapped at the beginning and the end of the i-th group of welding strips respectively; when a group of transverse welding strips pulled out along the second direction is 2 or more, for example 4, the outermost 2 welding strips of the 4 transverse welding strips are overlapped at the beginning and the end of the i-th group of welding strips respectively, and the other 2 transverse welding strips are evenly overlapped between the beginning and the end of the i-th group of welding strips.

[0121] Step 504, laying the front half of the i-th group of welding ribbons overlapped with the transverse welding ribbons on the front main grid line of the i-th solar cell;

[0122] Step 505, synchronously conveying the i-th cell and the i-th group of welding strips overlapped with the transverse welding strips forward, laying the i+1-th cell on the rear half of the i-th group of welding strips overlapped with the transverse welding strips, and placing i+1;

[0123] Typically, after laying the i+1th cell on the rear half of the i-th group of welding strips overlapped with the i-th tail end transverse welding strip, it can be determined whether i reaches a predetermined number. If it does not reach the predetermined number, i+1 is removed, and then the steps of pulling the welding strip along the first direction and cutting to form the i-th group of welding strips are continued;

[0124] Step 506, after the predetermined number of battery cells are laid, the predetermined number of battery cells and welding ribbons are welded.

[0125] When it is determined that i reaches a predetermined number, it can be understood that the laying of the predetermined number of battery cells is completed, and at this time, the laid predetermined number of battery cells and welding ribbons are welded.

[0126] In summary, the battery string connection method provided by itself improves the fixation of the soldering strips by vertically overlapping the transverse soldering strips at least at the head and tail ends of the soldering strip group, and greatly reduces the occurrence of solder joint failure and desoldering of the soldering strips when the soldering area of ​​the battery cell is small.

[0127] In addition, when the welding area at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding area on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0128] Corresponds to Figure 4 and Figure 5 The present application also provides two battery string connection devices, see respectively Fig. 6A and Figure 7 Explanation of the.

[0129] Fig. 6A It is a structural schematic diagram of a battery string connection device provided in one embodiment of the present application. The battery string connection device provided in the present application may include a solder ribbon feeding device 61, a solder ribbon pulling device 62, a solder ribbon cutting device 63, a solder ribbon rotating laying device 64, a second battery cell feeding device 65, a second conveying device 66 and a second welding device 67.

[0130] The soldering ribbon feeding device 61 is used to provide a group of soldering ribbons. In this embodiment, the soldering ribbon feeding device 61 can provide n+2 soldering ribbons at the same time.

[0131] The solder strip pulling device 62 is used to pull out a group of solder strips from the solder strip feeding device 61, and the pulled solder strips sequentially pass through the solder strip cutting device 63. The solder strip pulling device 62 can pull out n+2 solder strips from the solder strip feeding device 61 at the same time.

[0132] The welding strip cutting device 63 is used to cut the welding strip pulled out by the welding strip pulling device 62 to form n welding strips of the same length and two transverse welding strips.

[0133] The welding strip rotating and laying device 64 is used to rotate two transverse welding strips and lay them vertically on the head end and tail end of n welding strips of the same length as the head end and tail end of the welding strips, respectively. The rotation of the transverse welding strips is usually 90°.

[0134] The second battery cell feeding device 65, the welding tape traction device 62 and the welding tape rotating laying device 64 cooperate to stack the battery cells and the welding tape groups with the head end and the tail end respectively vertically overlapped with the head end transverse welding tape and the tail end transverse welding tape on the second conveying device 66, so that the front half of each group of welding tapes is laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding tapes is laid below the back main grid line of the rear battery cell between the two adjacent battery cells.

[0135] The second conveying device 66 is used to convey the stacked battery cells and welding ribbons to the second welding device 67 for welding.

[0136] The welding strip rotating laying device 64 may include a welding strip picking-up unit and a preheating unit, wherein the welding strip picking-up unit is configured to pick up the welding strip, and the preheating unit is configured to preheat the picked-up welding strip. Specifically, when Figure 2 After the n+2 solder strips are pulled by the solder strip pulling device 62 and laid on the battery cell on the second conveying device 66, the picking part of the solder strip rotating laying device 64 picks up the two transverse solder strips. After the two transverse solder strips are picked up, the preheating part of the solder strip rotating laying device 64 preheats the two transverse solder strips. After the preheating of the two transverse solder strips is completed, the solder strip rotating laying device 64 rotates to rotate the two transverse solder strips to be perpendicular to the n solder strips, and then lays the rotated two transverse solder strips on the n solder strips. When the preheating part starts preheating can be selected according to the process steps, and it only needs to meet the requirement of laying the two transverse solder strips before laying the n solder strips, so as to ensure that the two transverse solder strips can have a fixed connection state with the n solder strips to prevent the two transverse solder strips from sliding.

[0137] Alternatively, without using the weld ribbon rotating laying device 64, the weld ribbon traction device 62 includes n traction heads and two traction rotating heads respectively located at both ends of the n traction heads. The n traction heads and the two traction rotating heads simultaneously traction a group of weld ribbons. After the weld ribbon cutting device 63 cuts a group of weld ribbons to form n weld ribbons of the same length and two transverse weld ribbons, the two traction rotating heads respectively rotate the two transverse weld ribbons to be perpendicular to the n weld ribbons and preheat the two transverse weld ribbons.

[0138] In order to achieve the synchronous cutting of n solder strips and two transverse solder strips, the present application provides a special-shaped solder strip cutting device 63, such as Figure 6B As shown, the welding strip cutting device 63 may include a first set of blades 631 and a second set of blades 632 and a third set of blades 633 connected to the first set of blades 631, wherein the second set of blades 632 and the third set of blades 633 are respectively arranged at both ends of the first set of blades 631 and are located on the same side of the first set of blades 631. When the first set of blades 631 cuts the welding strip, the second set of blades 632 and the third set of blades 633 may also synchronously cut a corresponding welding strip.

[0139] Optionally, in order to realize the recycling of waste materials from cutting the solder strips, the battery string connection device provided in the present application may also include a waste material recycling device, which is arranged on the side of the solder strip cutting device 63, and is used to recycle the waste materials generated when the solder strip cutting device 63 cuts and forms two horizontal solder strips. Furthermore, the waste material recycling device may include a waste material picking part and a waste material recycling box, and the auxiliary material picking part may pick up the waste materials generated after cutting and put the waste materials into the waste material recycling box.

[0140] In summary, the battery string connection device provided in the present application improves the fixation of the soldering strips by vertically overlapping the transverse soldering strips at least at the head and tail ends of the soldering strip group, thereby greatly reducing the occurrence of cold soldering and desoldering of the soldering strips when the soldering area of ​​the battery cell is small.

[0141] Figure 7 It is a structural schematic diagram of a battery string connection device provided in another embodiment of the present application. The battery string connection device provided in the present application may include a first solder ribbon feeding device 71, a second solder ribbon feeding device 72, a first solder ribbon traction device 73, a second solder ribbon traction device 74, a first solder ribbon cutting device 75, a second solder ribbon cutting device 76, a second battery cell feeding device 77, a second conveying device 78 and a second welding device 79.

[0142] The first welding tape feeding device 71 is used to provide a group of welding tapes. The first welding tape traction device 73 tractions a group of welding tapes from the first welding tape feeding device 71 along a first direction. The tractiond welding tapes pass through the first welding tape cutting device 75 in sequence. The first welding tape cutting device 75 cuts the welding tapes tractiond by the first welding tape traction device 73 to form n parallel welding tapes of the same length. The first traction device lays the n parallel welding tapes of the same length on the conveying device.

[0143] The second welding tape feeding device 72 is used to provide a group of welding tapes. The second welding tape pulling device 74 pulls out a group of transverse welding tapes from the second welding tape feeding device 72 along a second direction perpendicular to the first direction. The pulled transverse welding tapes pass through the second welding tape cutting device 76 in sequence. The second welding tape cutting device 76 cuts the transverse welding tapes pulled out by the second welding tape pulling device 74 to form at least two parallel transverse welding tapes of the same length. The second pulling device vertically overlaps the at least two parallel transverse welding tapes of the same length at the head end, the tail end, and between the head end and the tail end of n parallel welding tapes of the same length.

[0144] It should be noted that, when the second traction device 74 pulls out a group of transverse welding strips along the second direction for two pieces, the two transverse welding strips are respectively overlapped with the beginning and tail ends of n parallel welding strips with the same length; when the second traction device 74 pulls out a group of transverse welding strips along the second direction for more than two pieces, for example, four pieces, the two outermost welding strips of the four transverse welding strips are respectively overlapped with the beginning and tail ends of n parallel welding strips with the same length, and the other two transverse welding strips are evenly overlapped between the beginning and tail ends of the n parallel welding strips with the same length.

[0145] The second battery cell feeding device 77, the first welding tape feeding device 71, the second welding tape feeding device 72, the first welding tape traction device 73, the second welding tape traction device 74, the first welding tape cutting device 75 and the second welding tape cutting device 76 cooperate to stack the battery cells and the welding tape groups vertically overlapped with the horizontal welding tapes onto the second conveying device 78, so that the front half of each welding tape group is laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each welding tape group is laid below the rear main grid line of the rear battery cell between the two adjacent battery cells.

[0146] The second conveying device 78 is used to convey the stacked battery cells and welding ribbons to the second welding device 79 for welding.

[0147] Optionally, the second welding strip pulling device 74 includes a pulling portion and a preheating portion, the pulling portion is configured to pull the transverse welding strip, and the preheating portion is configured to preheat the pulled transverse welding strip.

[0148] In summary, the battery string connection device provided in the present application improves the fixation of the soldering strips by vertically overlapping the transverse soldering strips at least at the head and tail ends of the soldering strip group, thereby greatly reducing the occurrence of cold soldering and desoldering of the soldering strips when the soldering area of ​​the battery cell is small.

[0149] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the technical features of the application herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not stated in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

[0150] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery string, characterized in that: The battery string includes a predetermined number of battery cells, at least one group of welding strips for connecting two adjacent battery cells in series, a head end transverse welding strip corresponding to the head end of each group of welding strips, and a tail end transverse welding strip corresponding to the tail end of each group of welding strips, the head end transverse welding strip and the tail end transverse welding strip are whole welding strips independent of each group of welding strips, and each group of welding strips includes n welding strips arranged in parallel and aligned, wherein: The head end transverse welding strip corresponding to each group of welding strips is vertically overlapped on the head end of each welding strip of the same group of welding strips, and the tail end transverse welding strip corresponding to each group of welding strips is vertically overlapped on the tail end of each welding strip of the same group of welding strips. The front half of each group of welding strips and the overlapped head end transverse welding strips are laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding strips and the overlapped tail end transverse welding strips are laid below the back main grid line of the rear battery cell between the two adjacent battery cells.

2. The battery string according to claim 1, characterized in that: The length of the head end transverse welding strip is the same as the length of the tail end transverse welding strip.

3. The battery string according to claim 1 or 2, characterized in that: Spaced welding areas are formed on the front main grid lines and the back main grid lines of the battery cell; or, A welding area is formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and a welding area is formed on the leading end and / or the trailing end of the main grid line on the back side of the cell; or, The leading end of the odd-numbered busbars on the front of the cell forms a welding area, the trailing end of the even-numbered busbars on the front of the cell forms a welding area, the trailing end of the odd-numbered busbars on the back of the cell forms a welding area, and the leading end of the even-numbered busbars on the back of the cell forms a welding area; or, The tail ends of the odd-numbered main grid lines on the front of the battery cell form a welding area, the leading ends of the even-numbered main grid lines on the front of the battery cell form a welding area, the leading ends of the odd-numbered main grid lines on the back of the battery cell form a welding area, and the tail ends of the even-numbered main grid lines on the back of the battery cell form a welding area.

4. The battery string according to claim 1 or 2, characterized in that: The middle of each welding strip is flattened, and two adjacent battery cells are stacked at their adjacent edges; or, The middle of each welding strip is bent, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance; or, Each welding ribbon is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

5. The battery string according to claim 1 or 2, characterized in that: The battery cell is a whole battery cell or a battery slice formed by slicing the whole battery cell.

6. A method for connecting batteries in series, characterized in that: The battery string connection method comprises: Pulling the welding ribbon and cutting it to form an i-th group of welding ribbons, wherein the i-th group of welding ribbons includes at least n welding ribbons that are parallel and aligned; The i-th head end transverse welding strip is vertically overlapped at the head ends of the n welding strips of the i-th group of welding strips, and the i-th tail end transverse welding strip is vertically overlapped at the tail ends of the n welding strips of the i-th group of welding strips, and the i-th head end transverse welding strip and the i-th tail end transverse welding strip are respectively whole welding strips independent of the i-th group of welding strips; Laying the front half of the i-th group of welding strips overlapped with the i-th head-end transverse welding strip on the front main grid line of the i-th solar cell; Synchronously conveying the i-th cell and the i-th group of welding ribbons forward, laying the i+1-th cell on the rear half of the i-th group of welding ribbons overlapped with the i-th tail end transverse welding ribbon, and continuing the steps of pulling the welding ribbons and cutting to form the i-th group of welding ribbons until the predetermined number of cells are laid; The predetermined number of cells and welding ribbons laid out are welded.

7. The battery string connection method according to claim 6, characterized in that: The pulling the welding strip and cutting to form the i-th group of welding strips comprises: Pulling n+2 welding strips, and cutting the pulled n+2 welding strips with a dislocation cutter to form n welding strips of the same length and two transverse welding strips, wherein the centers of the n welding strips are all located on the same straight line; The step of vertically overlapping the i-th head end transverse welding strip at the head ends of the n welding strips in the i-th group of welding strips, and vertically overlapping the i-th tail end transverse welding strip at the tail ends of the n welding strips in the i-th group of welding strips, comprises: Rotate two transverse welding strips in the i-th group of welding strips to be perpendicular to the remaining n welding strips; The two rotated transverse welding strips are respectively used as the i-th head end transverse welding strip and the i-th tail end transverse welding strip, and are vertically overlapped with the head end and tail end of the n welding strips of the i-th group of welding strips.

8. The battery string connection method according to claim 7, characterized in that: After the two transverse welding strips in the i-th group of welding strips are respectively rotated to be perpendicular to the remaining n welding strips, the battery string connection method further includes: Preheat the two rotated horizontal welding strips.

9. A method for connecting batteries in series, characterized in that: The battery string connection method comprises: Pulling the welding ribbon along a first direction and cutting it to form an i-th group of welding ribbons, wherein the i-th group of welding ribbons includes n welding ribbons that are parallel and aligned; Pulling the welding strip along a second direction and cutting it to form a group of transverse welding strips corresponding to the i-th group of welding strips, wherein the group of transverse welding strips includes at least two parallel and aligned transverse welding strips, and the second direction is perpendicular to the first direction; The two outermost welding strips of the transverse welding strips are overlapped at the head end and the tail end of the i-th group of welding strips respectively, and the other transverse welding strips are overlapped evenly between the head end and the tail end of the i-th group of welding strips; Laying the front half of the i-th group of welding ribbons overlapped with the transverse welding ribbons on the front main grid line of the i-th solar cell; Synchronously conveying the i-th cell and the i-th group of welding strips overlapped with the transverse welding strips forward, laying the i+1-th cell on the rear half of the i-th group of welding strips overlapped with the transverse welding strips, and continuing to perform the steps of pulling the welding strips along the first direction and cutting to form the i-th group of welding strips, until the predetermined number of cells are laid; The predetermined number of cells and welding ribbons laid out are welded.

10. The battery string connection method according to claim 9, characterized in that: After the welding strip is pulled along the second direction and cut to form a group of transverse welding strips corresponding to the i-th group of welding strips, the battery string connection method further includes: preheating the transverse welding strips.

11. A battery string connection device, characterized in that: The battery string connection device includes a welding strip feeding device, a welding strip pulling device, a welding strip cutting device, a welding strip rotating laying device, a first battery sheet feeding device, a first conveying device and a first welding device, wherein: The welding ribbon feeding device provides a group of welding ribbons; The welding tape pulling device pulls out a group of welding tapes from the welding tape feeding device, and the pulled welding tapes pass through the welding tape cutting device in sequence; The welding strip cutting device cuts the welding strip pulled out by the welding strip pulling device to form n welding strips of the same length and two transverse welding strips; The welding strip rotating and laying device rotates the two transverse welding strips and lays them vertically at the head end and the tail end of the n welding strips of the same length as the head end transverse welding strip and the tail end transverse welding strip respectively; The first cell feeding device, the welding tape pulling device and the welding tape rotating laying device cooperate to stack the cells and the welding tape groups with the head end transverse welding tape and the tail end transverse welding tape vertically overlapped at the head end and the tail end respectively, on the first conveying device, so that the front half of each group of welding tapes is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each group of welding tapes is laid below the rear main grid line of the rear cell of the two adjacent cells; The first conveying device conveys the stacked battery cells and welding ribbons to the first welding device for welding.

12. The battery string connection device according to claim 11, characterized in that: The solder strip rotating placement device comprises a solder strip picking-up unit and a preheating unit, wherein the solder strip picking-up unit is configured to pick up the solder strip, and the preheating unit is configured to preheat the picked-up solder strip; or, The welding tape pulling device comprises n pulling heads and two pulling rotating heads respectively located at two ends of the n pulling heads, the n pulling heads and the two pulling rotating heads pull a group of welding tapes at the same time, after the welding tape cutting device cuts the group of welding tapes into n welding tapes and two transverse welding tapes of the same length, the two pulling rotating heads respectively rotate the two transverse welding tapes to be perpendicular to the n welding tapes and preheat the two transverse welding tapes.

13. The battery string connection device according to claim 11, characterized in that: The welding strip cutting device comprises a first set of blades and a second set of blades and a third set of blades connected to the first set of blades. The second set of blades and the third set of blades are respectively arranged at two ends of the first set of blades and are located on the same side of the first set of blades.

14. The battery string connection device according to claim 11, characterized in that: The battery string connection device also includes a waste recovery device, which is arranged on the side of the solder strip cutting device and is used to recover the waste generated by the solder strip cutting device when cutting to form the two transverse solder strips.

15. A battery string connection device, characterized in that: The battery string connection device includes a first solder strip feeding device, a second solder strip feeding device, a first solder strip pulling device, a second solder strip pulling device, a first solder strip cutting device, a second solder strip cutting device, a second battery cell feeding device, a second conveying device and a second welding device, wherein: The first welding tape feeding device provides a group of welding tapes, the first welding tape pulling device pulls out a group of welding tapes from the first welding tape feeding device along a first direction, and the pulled welding tapes pass through the first welding tape cutting device in sequence; the first welding tape cutting device cuts the welding tape pulled out by the first welding tape pulling device to form n parallel welding tapes of the same length; the first pulling device lays the n parallel welding tapes of the same length on the conveying device; The second welding tape feeding device provides a group of welding tapes, the second welding tape pulling device pulls out a group of transverse welding tapes from the second welding tape feeding device along a second direction perpendicular to the first direction, and the pulled transverse welding tapes pass through the second welding tape cutting device in sequence; the second welding tape cutting device cuts the transverse welding tape pulled out by the second welding tape pulling device to form at least two parallel transverse welding tapes of the same length; the second pulling device vertically overlaps the at least two parallel transverse welding tapes of the same length at the head end, the tail end, and between the head end and the tail end of the n parallel welding tapes of the same length; The second cell feeding device, the first welding strip feeding device, the second welding strip feeding device, the first welding strip pulling device, the second welding strip pulling device, the first welding strip cutting device and the second welding strip cutting device cooperate to stack the cells and the welding strip groups vertically overlapped with the transverse welding strips on the second conveying device, so that the front half of each welding strip group is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each welding strip group is laid below the rear main grid line of the rear cell of the two adjacent cells; The second conveying device conveys the stacked battery cells and welding ribbons to the second welding device for welding.

16. The battery string connection device according to claim 15, characterized in that: The second welding strip pulling device includes a pulling portion and a preheating portion, wherein the pulling portion is configured to pull the transverse welding strip, and the preheating portion is configured to preheat the pulled transverse welding strip.

Images