Battery string welding equipment and welding method

Abstract

The present invention provides a battery string welding device and welding method, wherein the battery string welding device includes a welding support device, a battery cell laying device, a welding ribbon laying device, a welding device, and a welding ribbon cutting device, wherein: the battery cell laying device lays the battery cells on the welding support device so that the polarity of the electrode columns of adjacent battery cells on the same straight line is opposite; the welding ribbon laying device lays the welding ribbon on the battery cells according to the laying direction of the battery cells so that the electrode columns of each battery cell on the same straight line are covered by the same welding ribbon; the welding device welds the welding ribbon to the battery cells; and the welding ribbon cutting device is used to cut several welding ribbons between adjacent battery cells. The battery string welding device provided by the present invention uses a long welding ribbon to weld all the laid battery cells, and then cuts several welding ribbons of each adjacent battery cell according to a rule to form a battery string connected in series. The battery string welding device of the present invention greatly reduces the welding workload and improves welding efficiency.

Description

Technical Field

[0001] The present invention relates to the field of battery production, in particular to a battery string welding device and a welding method. Background Art

[0002] There is no main grid line on the front of the back-contact solar cell, and the positive and negative electrodes are both arranged on the back of the solar cell, thereby reducing the shading of the solar cell and improving the light conversion efficiency of the solar cell.

[0003] Currently, solder ribbon is commonly used to string back-contact solar cells together. This traditional method involves pre-cutting the ribbon into small segments, then soldering the segments between adjacent back-contact solar cells. This traditional method suffers from low welding efficiency. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a battery string welding device, which adopts the following technical solutions:

[0005] A battery string welding device is used to weld battery cells into strings. The back of the battery cell is provided with a first electrode and a second electrode of opposite polarity. The first electrodes are arranged in a row to form at least two first electrode rows, and the second electrodes are arranged in a row to form at least two second electrode rows. The first electrode rows and the second electrode rows are arranged in a staggered manner. The battery string welding device includes a welding support device, a battery cell laying device, a welding ribbon laying device, a welding device, and a welding ribbon cutting device, wherein:

[0006] The cell laying device is used to lay the cell backside upward on the welding carrier device so that the polarities of the electrode rows of adjacent cell sheets on the same straight line are opposite;

[0007] The welding ribbon laying device is used to lay multiple welding ribbons on the battery cells according to the laying direction of the battery cells, so that the electrode rows of each battery cell located on the same straight line are covered by the same welding ribbon;

[0008] The welding device is used to weld the welding ribbon on the welding carrier device to the covered battery cell;

[0009] The welding ribbon cutting device is used to cut several welding ribbons between adjacent battery cells, thereby forming a battery string connected in series.

[0010] The battery string welding equipment provided by the present invention uses long welding ribbons to weld all laid battery cells, and then cuts off several welding ribbons of adjacent battery cells according to rules to form battery strings connected in series. The battery string welding equipment of the present invention greatly reduces the welding workload and improves welding efficiency.

[0011] In some embodiments, the i-th laid cell is rotated 180° relative to the i-1-th laid cell, where i is a natural number greater than 1.

[0012] By rotating adjacent cells 180°, the opposite electrode rows of adjacent cells can be ensured to be on the same straight line.

[0013] In some embodiments, for the i-th battery cell laid, the weld ribbon cutting device cuts off all odd-numbered weld ribbons between the i-th battery cell and the i-1-th battery cell laid, and cuts off all even-numbered weld ribbons between the i-th battery cell and the i+1-th battery cell laid, or, for the i-th battery cell laid, the weld ribbon cutting device cuts off all even-numbered weld ribbons between the i-th battery cell and the i-1-th battery cell laid, and cuts off all odd-numbered weld ribbons between the i-th battery cell and the i+1-th battery cell laid, where i is a natural number greater than 1.

[0014] By cutting the welding ribbons between the battery cells in odd / even alternations, it is possible to ensure that the battery cells form a battery string connected in series.

[0015] In some embodiments, the ribbon cutting device includes a first cutting mechanism, which moves along the laying direction of the battery cells and sequentially cuts off all even-numbered ribbons or all even-numbered ribbons between adjacent battery cells; or, the ribbon cutting device includes a third cutting mechanism and a fourth cutting mechanism arranged side by side, which move synchronously along the laying direction of the battery cells, and the third cutting mechanism cuts off all odd-numbered ribbons or all even-numbered ribbons between the i-th battery cell and the i-1-th battery cell while the fourth cutting mechanism cuts off all even-numbered ribbons or all odd-numbered ribbons between the i-th battery cell and the i+1-th battery cell; or, the total number of battery cells laid on the welding carrier is N, and the ribbon cutting device includes N-1 groups of fifth cutting mechanisms arranged side by side along the laying direction of the battery cells, and each group of five cutting mechanisms correspondingly cuts off all odd-numbered ribbons or all even-numbered ribbons between a group of adjacent battery cells, wherein N is a natural number greater than 3.

[0016] Three different solder ribbon cutting devices are provided. The three solder ribbon cutting devices cut the target solder ribbons between adjacent battery cells in different ways. Among them, the third solder ribbon cutting device can cut the target solder ribbons between each group of adjacent battery cells at one time, which greatly improves the solder ribbon cutting efficiency.

[0017] In some embodiments, the solder ribbon cutting device is configured to cut a solder ribbon segment of a predetermined length from a cutting position of the solder ribbon, or to cut the solder ribbon at the cutting position of the solder ribbon.

[0018] When cutting, a predetermined length of the soldering ribbon is cut off, which ensures that the two soldering ribbon cut ends are completely separated at the soldering ribbon cut position, thereby preventing the two soldering ribbon cut ends from contacting and causing a short circuit.

[0019] In some embodiments, the battery string welding equipment further includes a welding ribbon pressing device, which is used to press the laid welding ribbon onto the battery cell.

[0020] By setting up a solder ribbon pressing device, the laid solder ribbon can be pressed against the battery cell, thereby ensuring the soldering effect of the solder ribbon and preventing cold solder joints.

[0021] In some embodiments, the solder ribbon pressing device includes a positioning tool and a tool transporting unit. The tool transporting unit is configured to transport the positioning tool to the laid solder ribbon. The positioning tool is used to press the solder ribbon onto the battery cell.

[0022] By cooperating with the positioning tool and the tool transport device, the welding strip is pressed and the positioning tool can be recycled.

[0023] In some embodiments, the battery string welding equipment further includes a welding ribbon bending device, and after the welding ribbon cutting device cuts the welding ribbon, the welding ribbon bending device bends the cut end of the cut welding ribbon.

[0024] By setting up a welding ribbon bending device, after the welding ribbon is cut, the cut end of the cut welding ribbon is bent, thereby ensuring that the two cut ends of the welding ribbon at the cutting point are completely separated, preventing the two cut ends of the welding ribbon from contacting and causing a short circuit.

[0025] In some embodiments, the welding carrier device includes a spacing adjustment machine and multiple carriers, wherein: multiple carriers are arranged on the spacing adjustment machine, and each carrier is laid with a battery cell; the spacing adjustment machine is used to adjust the spacing between each carrier; before the welding ribbon cutting device cuts the welding ribbon, the spacing between each carrier is a first spacing; after the welding ribbon cutting device cuts the welding ribbon, the spacing adjustment machine adjusts the spacing between each carrier to a second spacing, wherein the second spacing is greater than the first spacing.

[0026] By setting the welding support device into a spacing adjustment machine and a support platform, after the welding ribbon is cut, the spacing between each battery cell is increased by the spacing adjustment machine, thereby ensuring that the two cut ends of each welding ribbon are completely separated at the cutting point of each welding ribbon, preventing the two cut ends of the welding ribbon from contacting and causing a short circuit.

[0027] In some embodiments, the spacing adjustment machine includes a base plate, multiple sliders slidably connected to the base plate, and a slider driving mechanism, wherein: the slider driving mechanism is used to drive multiple sliders to slide on the base plate to adjust the spacing between the sliders; each slider is provided with a supporting platform.

[0028] A spacing adjustment machine with a simple structure is provided, which realizes the adjustment of the spacing between each bearing platform.

[0029] In some embodiments, a welding ribbon pad is provided on the supporting surface of the welding support device. After the cell placement device places the cells on the welding support device, the welding ribbons between adjacent cells are positioned on the welding ribbon pad. The cutter of the welding ribbon cutting device cuts downward toward the welding ribbon pad to sever the welding ribbon.

[0030] By providing the soldering ribbon gasket, the soldering ribbons between adjacent solar cells are all carried on the soldering ribbon gasket, thereby facilitating the cutter of the soldering ribbon cutting device to perform mechanical cutting of the soldering ribbon.

[0031] In some embodiments, the ribbon cutting device is an ultrasonic or laser cutting device.

[0032] Ultrasonic or laser cutting devices can further improve welding results.

[0033] The present invention also provides a battery string welding method for welding battery cells into a string, wherein the back of the battery cell is provided with a first electrode and a second electrode with opposite polarities, the first electrodes are arranged in a row to form at least two first electrode columns, the second electrodes are arranged in a row to form at least two second electrode columns, and the first electrode columns and the second electrode columns are arranged in a staggered manner. The battery string welding method includes:

[0034] The battery cells are placed on the welding carrier with their backs facing upwards, so that the polarities of the electrode rows of adjacent battery cells on the same straight line are opposite.

[0035] Multiple welding ribbons are laid on the battery cells according to the laying direction of the battery cells, so that the electrode rows of each battery cell located on the same straight line are covered by the same welding ribbon.

[0036] Solder the solder ribbon to the covered battery cell.

[0037] Cut off several welding strips between adjacent battery cells to form a battery string connected in series.

[0038] The battery string welding method provided by the present invention uses a long welding ribbon to weld all laid battery cells, and then cuts off several welding ribbons of adjacent battery cells according to rules to form a battery string connected in series. The battery string welding equipment of the present invention greatly reduces the welding workload and improves welding efficiency.

[0039] In some embodiments, the i-th laid cell is rotated 180° relative to the i-1-th laid cell, where i is a natural number greater than 1.

[0040] By rotating adjacent cells 180°, the opposite electrode rows of adjacent cells can be ensured to be on the same straight line.

[0041] In some embodiments, for the i-th battery cell laid, all odd-numbered welding ribbons between the i-th battery cell and the i-1-th battery cell laid, and all even-numbered welding ribbons between the i-th battery cell and the i+1-th battery cell laid, or, for the i-th battery cell laid, the welding ribbon cutting device cuts off all even-numbered welding ribbons between the i-th battery cell and the i-1-th battery cell laid, and cuts off all odd-numbered welding ribbons between the i-th battery cell and the i+1-th battery cell laid, where i is a natural number greater than 1.

[0042] By cutting the welding ribbons between the battery cells in odd / even alternations, it is possible to ensure that the battery cells form a battery string connected in series.

[0043] In some embodiments, after laying the plurality of welding ribbons on the battery cells according to the laying direction of the battery cells, the battery string welding method further includes: pressing the welding ribbons onto the battery cells.

[0044] Press the laid solder ribbon onto the battery cell to ensure the soldering effect of the solder ribbon and prevent cold solder joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a structural diagram of a back-connected battery cell in an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of laying four consecutive battery cells in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of four consecutive battery cells connected in series in an embodiment of the present invention;

[0048] Figure 4 Schematic diagram of the structure of a welding support device in an embodiment of the present invention;

[0049] Figures 1 to 4 Included are:

[0050] Solar cell 100, first electrode array 101, second electrode array 102;

[0051] Welding ribbon 200, first cut end 31, second cut end 32;

[0052] The welding supporting device 30 comprises a spacing adjustment platform 31 , a supporting platform 32 , a bottom plate 311 , and a slider 312 . DETAILED DESCRIPTION

[0053] 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.

[0054] The traditional method of welding battery strings generally involves pre-cutting the solder ribbon into small segments, and then welding the segments between adjacent back-contact solar cells. This traditional welding method has low welding efficiency.

[0055] In view of this, the present invention provides a battery string welding device and a welding method to achieve welding battery cells into strings.

[0056] The battery cells welded in the present invention are back-connected battery cells, such as Figure 1 As shown, this type of battery cell 100 has a first electrode (such as a positive electrode) and a second electrode (such as a negative electrode) with opposite polarities on its back, the first electrodes are arranged in columns to form at least two first electrode columns 101, the second electrodes are arranged in columns to form at least two second electrode columns 102, and the first electrode columns 101 and the second electrode columns 102 are arranged alternately.

[0057] Figure 1 The battery cell 100 shown in the example includes three columns of first electrode columns 101 and three columns of second electrode columns 102. Each column of the first electrode columns 101 and each column of the second electrode columns 102 includes four first electrodes and four second electrodes, respectively. Of course, in the actual production of the battery cell 100, the number of first electrode columns 101 and second electrode columns 102 may far exceed three, and the number of first electrodes and second electrodes included in each column of the first electrode columns 101 and each column of the second electrode columns 102 may also far exceed four.

[0058] The battery string welding device and the battery string welding method provided by the present invention will be respectively introduced as examples through two embodiments below.

[0059] First embodiment

[0060] The battery string welding equipment provided in this embodiment includes a welding support device, a battery cell laying device, a welding ribbon laying device, a welding device, and a welding ribbon cutting device, wherein:

[0061] like Figure 2 As shown, the cell laying device is used to lay the cell 100 with its back side facing upward on the welding carrier, so that the polarities of the electrode rows of adjacent cell 100 that are on the same straight line are opposite.

[0062] like Figure 3 As shown, the solder ribbon laying device is used to lay multiple solder ribbons 200 on the battery cells 100 according to the laying direction of the battery cells 100, so that the electrode rows of each battery cell 100 located on the same straight line are covered by the same solder ribbon 200.

[0063] The welding device is used to weld the welding ribbon 200 on the welding carrier device to the covered battery cell 100;

[0064] The welding ribbon cutting device is used to cut a number of welding ribbons between adjacent battery cells 100, thereby forming battery strings connected in series.

[0065] It should be noted that, as an example, Figure 2 and Figure 3 The battery string shown includes only four battery cells. In actual production, the battery string may be formed by welding more battery cells in series.

[0066] As can be seen, the battery string welding equipment provided in this embodiment uses long welding ribbons to weld all laid-out battery cells, and then regularly cuts the welding ribbons of adjacent battery cells to form a series of battery strings. Compared with traditional battery string welding methods, the battery string welding equipment provided in this embodiment greatly reduces the welding workload and improves welding efficiency.

[0067] Optionally, to ensure that opposite electrode columns of adjacent cells are located on the same straight line, the i-th cell to be laid is horizontally rotated 180° relative to the i-1-th cell to be laid, where i is a natural number greater than 1.

[0068] In actual production, the cells can be placed in a straight line on a workbench. After placement, the i-th cell is rotated 180° horizontally relative to the i-1th cell along the placement direction. Subsequently, the cell placement device directly places the placed cells onto the welding support device one by one or all at once. During the placement process, the cell placement device does not need to rotate the cells.

[0069] Of course, the cell laying device can also implement a 180° rotation of the cell, that is, after the cell laying device completes laying the i-1th cell, it needs to rotate the i-th cell 180° relative to the i-1th cell before laying it.

[0070] Optionally, for the i-th cell laid, the ribbon cutting device cuts off all odd-numbered ribbons between the i-th cell and the i-1-th cell laid, and cuts off all even-numbered ribbons between the i-th cell and the i+1-th cell laid. Alternatively, for the i-th cell laid, the ribbon cutting device cuts off all even-numbered ribbons between the i-th cell and the i-1-th cell laid, and cuts off all odd-numbered ribbons between the i-th cell and the i+1-th cell laid, where i is a natural number greater than 1.

[0071] For example, Figure 3In the illustrated embodiment, the target battery string includes four battery cells 100, with six rows of electrodes on the battery cells 100. Accordingly, the number of welding ribbons 200 is six. Optionally, the three odd-numbered welding ribbons located between the first and second battery cells, namely the 1st, 3rd, and 5th welding ribbons, are cut. The three even-numbered welding ribbons located between the second and third battery cells, namely the 2nd, 4th, and 6th welding ribbons, are cut. The three odd-numbered welding ribbons located between the third and fourth battery cells, namely the 1st, 3rd, and 5th welding ribbons, are cut.

[0072] It can be seen that by cutting the welding ribbons 200 between the battery cells 100 in odd / even alternating manner, it is possible to ensure that the battery cells 100 form a battery string connected in series.

[0073] Optionally, the welding ribbon cutting device can select the following three implementation modes according to actual conditions.

[0074] The first implementation method:

[0075] The ribbon cutting device includes a first cutting mechanism that moves along the direction in which the cells are laid out and sequentially cuts all or all even-numbered ribbons between adjacent cells. After the first cutting mechanism completes cutting the target ribbon between the current set of adjacent cells, it moves a first predetermined distance, roughly the length of one cell, along the direction in which the cells are laid out, to reach the next set of adjacent cells and cut the target ribbon between the next set of adjacent cells. This process is repeated until the target ribbons between all adjacent cells are cut.

[0076] The solder ribbon cutting device of this embodiment is provided with only one set of cutting mechanisms, and therefore can only cut the target solder ribbon between a set of corresponding solar cells at a time, resulting in low solder ribbon cutting efficiency. However, this solder ribbon cutting device has the advantages of simple structure and low cost.

[0077] Second implementation method:

[0078] The ribbon cutting device includes a third cutting mechanism and a fourth cutting mechanism arranged side by side. The third and fourth cutting mechanisms move synchronously along the direction in which the solar cells are laid. While the third cutting mechanism cuts all odd-numbered ribbons or all even-numbered ribbons between the i-th and i-1-th solar cells, the fourth cutting mechanism cuts all even-numbered ribbons or all odd-numbered ribbons between the i-th and i+1-th solar cells. After the third and fourth cutting mechanisms complete cutting the target ribbons between two adjacent groups of solar cells, they then synchronously move a second predetermined distance, approximately twice the length of the solar cells, along the direction in which the solar cells are laid, to reach between two subsequent groups of solar cells and cut the target ribbons between the two subsequent groups of solar cells. This process is repeated until the target ribbons between all adjacent solar cells are cut.

[0079] Compared with the first embodiment, the solder ribbon cutting device in this embodiment is provided with two sets of cutting mechanisms, which can simultaneously cut the target solder ribbons between two sets of adjacent battery cells, thereby improving the solder ribbon cutting efficiency.

[0080] The third implementation method:

[0081] Assume that the total number of battery cells laid on the welding carrier is N, and the welding ribbon cutting device includes N-1 groups of fifth cutting mechanisms arranged side by side along the laying direction of the battery cells. Each group of five cutting mechanisms corresponds to cutting all odd-numbered welding ribbons or all even-numbered welding ribbons between a group of adjacent battery cells, where N is a natural number greater than 3.

[0082] The solder ribbon cutting device in this embodiment can cut the target solder ribbons between all adjacent battery cells at one time, thereby greatly improving the solder ribbon cutting efficiency.

[0083] In the actual production process, after the target ribbon between the adjacent battery cells 100 is cut by the ribbon cutting device, the two ribbon cut ends (such as Figure 3 Since the first welding ribbon cut end 201 and the second welding ribbon cut end 202 are too close to each other, accidental contact may occur, thereby causing a short circuit failure in the battery string.

[0084] To avoid short-circuit faults, this embodiment provides three optional solutions:

[0085] First solution:

[0086] By configuring the solder strip cutting device, the solder strip cutting device cuts a solder strip segment of a predetermined length from the cutting position of the solder strip 200 , thereby maintaining a distance between the first solder strip cut end 201 and the second solder strip cut end 202 that is equivalent to the length of the solder strip segment.

[0087] Second solution:

[0088] A special welding ribbon bending device is additionally provided. After the welding ribbon cutting device cuts the welding ribbon at the cutting position, the welding ribbon bending device then bends the cut end of the welding ribbon upward or downward, thereby completely separating the two cut ends of the welding ribbon at the cutting position.

[0089] Third solution:

[0090] Provide a welding carrier device, such as Figure 4 As shown, the welding carrier device 30 is configured to include a spacing adjustment machine 31 and multiple carriers 32. The multiple carriers 32 are mounted on the spacing adjustment machine 31, and each carrier 32 is used to place a single cell. In other words, the cell placement device places the cells on the carriers 32. The spacing adjustment machine 31 is used to adjust the spacing between the carriers 32.

[0091] Before the ribbon cutting device cuts the ribbon, the spacing between the supporting platforms 32 is a first spacing. After the ribbon cutting device cuts the ribbon, the spacing adjustment device 31 adjusts the spacing between the supporting platforms 32 to a second spacing, where the second spacing is greater than the first spacing. This allows the two cut ends of the ribbon to be completely separated at the cutting point.

[0092] Optionally, the spacing adjustment machine 31 includes a base plate 311, multiple sliders 312 slidably connected to the base plate 311, and a slider driving mechanism, wherein: the slider driving mechanism is used to drive multiple sliders 312 to slide on the base plate to adjust the spacing between each slider 312, and each slider 312 is provided with a supporting platform 32.

[0093] It can be seen that by driving the spacing adjustment machine 31, after the solder strips are cut, the spacing between the battery cells can be increased, thereby ensuring that the two cut ends of each solder strip are completely separated.

[0094] In actual production, the second spacing is generally set to be equal to the target spacing between adjacent battery cells in the battery string after welding is completed. For example, in some embodiments, the target spacing between adjacent battery cells in the battery string after welding is completed is 2 mm. Therefore, in these embodiments, the spacing between each support platform 32 can be adjusted to 1 mm (i.e., the first spacing). After the welding ribbon cutting device cuts the welding ribbon, the spacing between each support platform 32 is adjusted to 2 mm (i.e., the second spacing) through the spacing adjustment machine. In this way, it can be ensured that the two cut ends of each welding ribbon at the cutting point are completely separated, and the spacing between each adjacent battery cell is equal to the target spacing.

[0095] To ensure that the soldering ribbon can be welded tightly to the cell and prevent cold solder joints, the battery string welding equipment in this embodiment optionally further includes a soldering ribbon pressing device, which is used to press the laid soldering ribbon onto the cell. Optionally, the soldering ribbon pressing device includes a positioning fixture and a fixture transport unit, the fixture transport unit being configured to transport the positioning fixture to the laid soldering ribbon, and the positioning fixture being used to press the soldering ribbon onto the cell.

[0096] As described above, the battery string welding equipment of this embodiment first places the battery cells on the welding support device, and then places the welding ribbon on the battery cells. Therefore, there is a gap between the welding ribbon between adjacent battery cells and the support surface of the welding support device that is equivalent to the thickness of the battery cell. That is, the welding ribbon between adjacent battery cells is in a suspended state. In this state, if a mechanical cutting method is used, it is difficult for the cutter of the welding ribbon cutting device to effectively cut the welding ribbon. In view of this, optionally, in this embodiment, a welding ribbon gasket is provided on the support surface of the welding support device. After the battery cell laying device places the battery cells on the welding support device, the welding ribbons between adjacent battery cells are supported on the welding ribbon gasket. In this way, the cutter of the welding ribbon cutting device can smoothly cut the welding ribbon when cutting downward toward the welding ribbon gasket.

[0097] Optionally, the battery string welding equipment in this embodiment may also use an ultrasonic or laser cutting device as a welding ribbon cutting device, thereby further improving the welding effect.

[0098] Second embodiment

[0099] The battery string welding method provided in this embodiment can be implemented by the battery string welding arrangement in the first embodiment. Specifically, the battery string welding method includes:

[0100] like Figure 2 As shown, the battery cells are placed on the welding carrier with their backs facing upwards, so that the polarities of the electrode rows of adjacent battery cells that are in the same straight line are opposite.

[0101] like Figure 3 As shown, multiple welding ribbons are laid on the battery cells according to the laying direction of the battery cells, so that the electrode rows of each battery cell located on the same straight line are covered by the same welding ribbon.

[0102] Solder the solder ribbon to the covered battery cell.

[0103] Cut off several welding strips between adjacent battery cells to form a battery string connected in series.

[0104] The battery string welding method provided in this embodiment uses a long welding ribbon to weld all laid-out battery cells, and then cuts off several welding ribbons of adjacent battery cells according to a rule to form a battery string connected in series. The battery string welding equipment of the present invention greatly reduces the welding workload and improves welding efficiency.

[0105] Optionally, to ensure that opposite electrode columns of adjacent cells are located on the same straight line, the i-th cell to be laid is horizontally rotated 180° relative to the i-1-th cell to be laid, where i is a natural number greater than 1.

[0106] In actual production, the cells can be placed in a straight line on a workbench. After placement, the i-th cell is rotated 180° horizontally relative to the i-1th cell along the placement direction. Subsequently, the cell placement device directly places the placed cells onto the welding support device one by one or all at once. During the placement process, the cell placement device does not need to rotate the cells.

[0107] Of course, the cell laying device can also implement a 180° rotation of the cell, that is, after the cell laying device completes laying the i-1th cell, it needs to rotate the i-th cell 180° relative to the i-1th cell before laying it.

[0108] Optionally, for the i-th cell laid, the ribbon cutting device cuts off all odd-numbered ribbons between the i-th cell and the i-1-th cell laid, and cuts off all even-numbered ribbons between the i-th cell and the i+1-th cell laid. Alternatively, for the i-th cell laid, the ribbon cutting device cuts off all even-numbered ribbons between the i-th cell and the i-1-th cell laid, and cuts off all odd-numbered ribbons between the i-th cell and the i+1-th cell laid, where i is a natural number greater than 1.

[0109] For example, Figure 3 In the illustrated embodiment, the target battery string includes four battery cells 100, with six rows of electrodes on the battery cells 100. Accordingly, the number of welding ribbons 200 is six. Optionally, the three odd-numbered welding ribbons located between the first and second battery cells, namely the 1st, 3rd, and 5th welding ribbons, are cut. The three even-numbered welding ribbons located between the second and third battery cells, namely the 2nd, 4th, and 6th welding ribbons, are cut. The three odd-numbered welding ribbons located between the third and fourth battery cells, namely the 1st, 3rd, and 5th welding ribbons, are cut.

[0110] It can be seen that by cutting the welding ribbons 200 between the battery cells 100 in odd / even alternating manner, it is possible to ensure that the battery cells 100 form a battery string connected in series.

[0111] Optionally, after laying the plurality of welding ribbons on the battery cells according to the laying direction of the battery cells, the welding ribbons are first pressed tightly against the battery cells and then welding is performed.

[0112] It should be noted that the various optional implementations in the first embodiment described above are also applicable to this embodiment and will not be described in detail here.

[0113] The present invention has been described above in sufficient detail with certain particularities. Those skilled in the art will appreciate that the descriptions in the embodiments are merely illustrative, and that all modifications that do not depart from the true spirit and scope of the invention are intended to be within the scope of protection of the present invention. The scope of protection claimed in the present invention is defined by the appended claims, not by the foregoing description of the embodiments.

Claims

1. A battery string welding device for welding battery cells into strings, wherein the back of the battery cell is provided with a first electrode and a second electrode of opposite polarity, the first electrodes are arranged in a row to form at least two first electrode columns, the second electrodes are arranged in a row to form at least two second electrode columns, and the first electrode columns and the second electrode columns are arranged in a staggered manner, characterized in that: The battery string welding equipment includes a welding support device, a battery cell laying device, a welding ribbon laying device, a welding device and a welding ribbon cutting device, wherein: The cell laying device is used to lay the cell backside upward on the welding carrier device so that the polarities of the electrode rows of adjacent cell sheets on the same straight line are opposite; The welding ribbon laying device is used to lay multiple welding ribbons on the battery cells according to the laying direction of the battery cells, so that the electrode rows of each battery cell located on the same straight line are covered by the same welding ribbon; The welding device is used to weld the welding ribbon on the welding carrier device to the covered battery cell; The solder ribbon cutting device is used to cut a plurality of solder ribbons between adjacent battery cells, thereby forming a battery string connected in series; the solder ribbon cutting device is configured to cut a solder ribbon segment of a predetermined length from a cutting position of the solder ribbon; or, The battery string welding equipment further includes a welding ribbon bending device, which bends the cut end of the welding ribbon after the welding ribbon cutting device cuts the welding ribbon; or The welding carrier device includes a spacing adjustment machine and multiple carriers, wherein: the multiple carriers are arranged on the spacing adjustment machine, and each carrier is laid with a battery cell; the spacing adjustment machine is used to adjust the spacing between each of the carriers; before the welding ribbon cutting device cuts the welding ribbon, the spacing between each of the carriers is a first spacing; after the welding ribbon cutting device cuts the welding ribbon, the spacing adjustment machine adjusts the spacing between each of the carriers to a second spacing, wherein the second spacing is greater than the first spacing.

2. The battery string welding equipment according to claim 1, characterized in that: The i-th cell laid out is rotated 180° relative to the i-1-th cell laid out, where i is a natural number greater than 1.

3. The battery string welding equipment according to claim 1, characterized in that: For the laid i-th cell, the ribbon cutting device cuts off all odd-numbered ribbons between the i-th cell and the laid i-1-th cell, and cuts off all even-numbered ribbons between the i-th cell and the laid i+1-th cell, or, For the laid i-th cell, the ribbon cutting device cuts off all even-numbered ribbons between the i-th cell and the laid i-1-th cell, and cuts off all odd-numbered ribbons between the i-th cell and the laid i+1-th cell. Wherein, i is a natural number greater than 1.

4. The battery string welding equipment according to claim 3, characterized in that: The welding ribbon cutting device includes a first cutting mechanism, which moves along the laying direction of the battery cells and sequentially cuts off all even-numbered welding ribbons or all even-numbered welding ribbons between adjacent battery cells; or, The welding ribbon cutting device includes a third cutting mechanism and a fourth cutting mechanism arranged side by side, and the third cutting mechanism and the fourth cutting mechanism move synchronously along the laying direction of the battery cells. When the third cutting mechanism cuts off all odd-numbered welding ribbons or all even-numbered welding ribbons between the i-th battery cell and the i-1-th battery cell, the fourth cutting mechanism cuts off all even-numbered welding ribbons or all odd-numbered welding ribbons between the i-th battery cell and the i+1-th battery cell; or The total number of battery cells laid on the welding carrier is N, and the welding ribbon cutting device includes N-1 groups of fifth cutting mechanisms arranged side by side along the laying direction of the battery cells. Each group of the fifth cutting mechanisms corresponds to cutting all odd-numbered welding ribbons or all even-numbered welding ribbons between a group of adjacent battery cells, where N is a natural number greater than 3.

5. The battery string welding equipment according to claim 1, characterized in that: The battery string welding equipment further includes a welding ribbon pressing device, which is used to press the laid welding ribbon onto the battery cell.

6. The battery string welding equipment according to claim 5, characterized in that: The welding ribbon pressing device includes a positioning tool and a tool conveying part. The tool conveying part is configured to convey the positioning tool to the laid welding ribbon. The positioning tool is used to press the welding ribbon onto the battery cell.

7. The battery string welding equipment according to claim 1, characterized in that: The spacing adjustment machine includes a base plate, a plurality of sliders slidably connected to the base plate, and a slider driving mechanism, wherein: The slider driving mechanism is used to drive the multiple sliders to slide on the base plate to adjust the distance between the sliders; Each of the sliding blocks is provided with a bearing platform.

8. The battery string welding equipment according to claim 1, characterized in that: A welding strip gasket is provided on the bearing surface of the welding bearing device; After the cell laying device lays the cell on the welding carrier, the welding strips between adjacent cell sheets are all located on the welding strip pads; The cutter of the welding ribbon cutting device cuts downward toward the welding ribbon gasket to cut off the welding ribbon.

9. The battery string welding equipment according to claim 1, characterized in that: The welding ribbon cutting device is an ultrasonic or laser cutting device.

10. A battery string welding method for welding battery cells into strings, wherein the back of the battery cell is provided with a first electrode and a second electrode of opposite polarity, the first electrodes are arranged in a row to form at least two first electrode columns, the second electrodes are arranged in a row to form at least two second electrode columns, and the first electrode columns and the second electrode columns are arranged in a staggered manner, characterized in that: The battery string welding method comprises: Place the battery cells with their backs facing upwards on the welding carrier, so that the polarities of the electrode rows of adjacent battery cells on the same straight line are opposite; Laying multiple welding ribbons on the battery cells in the laying direction of the battery cells so that the electrode rows on the same straight line of each battery cell are covered by the same welding ribbon; Solder the solder ribbon to the covered battery cell; Several welding ribbons between adjacent battery cells are cut, and the two cut ends of the welding ribbons produced after the cutting are separated, thereby forming a battery string connected in series.

11. The battery string welding method according to claim 10, wherein: The i-th cell laid out is rotated 180° relative to the i-1-th cell laid out, where i is a natural number greater than 1.

12. The battery string welding method according to claim 10, wherein: For the i-th cell laid, cut off all odd-numbered welding ribbons between the i-th cell and the i-1-th cell laid, and cut off all even-numbered welding ribbons between the i-th cell and the i+1-th cell laid, or, For the laid i-th cell, the ribbon cutting device cuts off all even-numbered ribbons between the i-th cell and the laid i-1-th cell, and cuts off all odd-numbered ribbons between the i-th cell and the laid i+1-th cell. Wherein, i is a natural number greater than 1.

13. The battery string welding method according to claim 10, wherein: After laying the plurality of welding ribbons on the battery cells according to the laying direction of the battery cells, the battery string welding method further includes: pressing the welding ribbons onto the battery cells.

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