A battery string welding device and a welding method

Abstract

The present invention provides a battery string welding device and a welding method, wherein the battery string welding device includes a welding carrier, a welding ribbon laying device, a battery cell laying device, a welding ribbon cutting device and a welding device, wherein: the welding carrier includes a plurality of carriers, each carrier carrying a battery cell. The welding ribbon laying device lays a plurality of welding ribbons in parallel on a plurality of carriers. The battery cell laying device lays a plurality of battery cells with their backs facing downward on a plurality of carriers, wherein each electrode column of the laid battery cells is pressed against a corresponding welding ribbon, and the polarity of the electrode columns of adjacent battery cells pressed against the same welding ribbon is opposite. The welding ribbon cutting device cuts off a number of welding ribbons between adjacent battery cells. The welding device welds the welding ribbons to the battery cells, thereby forming 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 cells 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 welding ribbon laying device, a battery cell laying device, a welding ribbon cutting device, and a welding device, wherein:

[0006] The welding carrier device includes a plurality of carrier platforms arranged on the same installation axis, and each carrier platform is configured to carry a laid battery cell.

[0007] The welding ribbon laying device is configured to lay multiple welding ribbons in parallel on multiple supporting platforms, wherein each welding ribbon is parallel to the installation axis.

[0008] The cell laying device is configured to lay multiple cell sheets with their backs facing down on multiple carriers, wherein each electrode column of the laid cell sheets is pressed against the corresponding welding strip, and the polarity of the electrode columns of adjacent cell sheets on the same welding strip pressed against each other are opposite.

[0009] The welding ribbon cutting device is configured to cut off a plurality of welding ribbons between adjacent battery cells.

[0010] The welding device is configured to heat the battery cells and the welding ribbons to weld the welding ribbons to the battery cells, thereby forming battery strings connected in series.

[0011] The battery string welding equipment provided by the present invention uses long welding ribbons to connect all laid-out battery cells. The ribbons are then cut regularly between adjacent battery cells before being welded to the battery string to form a series-connected battery string. This battery string welding equipment significantly reduces welding workload and improves welding efficiency.

[0012] In some embodiments, for the i-th battery cell being laid, the ribbon cutting device cuts off all odd-numbered ribbons between the i-th battery cell and the i-1-th battery cell being laid, and cuts off all even-numbered ribbons between the i-th battery cell and the i+1-th battery cell being laid, or, for the i-th battery cell being laid, the ribbon cutting device cuts off all even-numbered ribbons between the i-th battery cell and the i-1-th battery cell being laid, and cuts off all odd-numbered ribbons between the i-th battery cell and the i+1-th battery cell being laid, where i is a natural number greater than 1.

[0013] 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.

[0014] In some embodiments, each supporting platform is provided with a plurality of welding ribbon accommodating grooves extending parallel to the installation axis, and the welding ribbon laying device aligns the plurality of welding ribbons with the plurality of welding ribbon accommodating grooves and then lays them on the plurality of supporting platforms.

[0015] The positioning of the welding strips is achieved by arranging welding strip accommodating grooves on each supporting platform.

[0016] In some embodiments, the thickness of the solder ribbon exceeds the depth of the solder ribbon receiving groove.

[0017] By setting the depth of the welding strip accommodating groove, it is ensured that the welding strip can protrude from the welding strip accommodating groove, so that the welding strip contacts the electrode columns on the battery cell.

[0018] In some embodiments, a solder strip lifting member is provided at the bottom of the solder strip accommodating groove, and the solder strip lifting member is used to lift the solder strip upward so that the solder strip protrudes out of the solder strip accommodating groove.

[0019] By providing the soldering strip lifting member, the soldering strip is lifted, thereby ensuring that the soldering strip can protrude from the soldering strip accommodating groove, so that the soldering strip contacts the electrode array on the battery cell.

[0020] In some embodiments, the supporting platform is further provided with a solder strip clamping mechanism located on the side of the solder strip accommodating groove, and the solder strip clamping mechanism is used to clamp and position the solder strip into the solder strip accommodating groove.

[0021] By providing a soldering ribbon clamping mechanism, the soldering ribbon is clamped and positioned in the soldering ribbon accommodating groove, thereby preventing the soldering ribbon from being misaligned with the electrode array on the battery cell.

[0022] In some embodiments, the welding support device further includes a spacing adjustment machine, wherein a plurality of support platforms are disposed on the spacing adjustment machine, and the spacing adjustment machine is used to adjust the spacing between the support platforms; wherein: before the ribbon cutting device cuts the ribbon, the spacing between the support platforms is a first spacing. After the ribbon cutting device cuts the ribbon, the spacing adjustment machine adjusts the spacing between the support platforms to a second spacing, wherein the second spacing is greater than the first spacing.

[0023] By driving the spacing adjustment machine, after the welding ribbon is cut, the spacing between each battery cell can be increased, thereby ensuring that the two cut ends of each welding ribbon are completely separated, preventing the two cut ends of the welding ribbon from contacting and causing a short circuit.

[0024] 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 each slider; each slider is provided with a supporting platform.

[0025] A spacing adjustment machine with a simple structure is provided, which realizes the adjustment of the spacing between each bearing platform.

[0026] In some embodiments, the ribbon cutting device is a cutting device, an ultrasonic cutting device, or a laser cutting device.

[0027] By setting up the welding ribbon cutting device, mechanical cutting, ultrasonic cutting and laser cutting of the welding ribbon can be achieved.

[0028] In some embodiments, the cutting device includes a first cutter, which moves along the laying direction of the battery cells and cuts off all odd-numbered welding ribbons or all even-numbered welding ribbons between each adjacent battery cell in sequence; or, the cutting device includes a third cutter and a fourth cutter arranged side by side, and the third cutter and the fourth cutter move synchronously along the laying direction of the battery cells, and the third cutter 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 while the fourth cutter 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 cutting device includes N-1 fifth cutters arranged side by side along the laying direction of the battery cells, and each fifth cutter corresponds to cutting off 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.

[0029] Three different cutting devices are provided, which implement cutting of the target welding strips between adjacent battery cells in different ways. Among them, the third cutting device can cut the target welding strips between each group of adjacent battery cells at one time, which greatly improves the welding strip cutting efficiency.

[0030] In some embodiments, the welding device includes a lifting drive mechanism and a heating mechanism, wherein: the heating mechanism is connected to the driving end of the lifting drive mechanism, and the lifting drive mechanism drives the heating mechanism to lift and lower; after the battery cell laying device lays multiple battery cells with their backs facing down on multiple supporting platforms, the lifting drive mechanism drives the heating mechanism to descend so that the heating mechanism is close to or pressed against the battery cells, and the heating mechanism heats the battery cells and the welding ribbons to weld the welding ribbons to the battery cells.

[0031] A welding device with a simple structure is provided, which uses a heating mechanism to heat all laid battery cells and welding strips as a whole, thereby welding the welding strips to the battery cells.

[0032] A second aspect of the present invention provides a battery string welding method for welding battery cells into a string, wherein a first electrode and a second electrode with opposite polarities are provided on the back of the battery cell, 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:

[0033] A plurality of welding ribbons are laid side by side on a plurality of supporting platforms arranged on the same installation axis, wherein each welding ribbon is parallel to the installation axis and is supported on each supporting platform at the same time.

[0034] Multiple battery cells are laid out with their backs facing downwards on multiple carriers, wherein each carrier is configured to carry a laid battery cell, and each electrode column of the laid battery cell is pressed against the corresponding welding strip, and the polarity of the electrode columns of adjacent battery cells on adjacent carriers pressed against the same welding strip is opposite.

[0035] Cut off several welding ribbons between adjacent battery cells.

[0036] The battery cells and the soldering ribbons are heated to solder the soldering ribbons to the battery cells, thereby forming a battery string connected in series.

[0037] The battery string welding method provided by the present invention uses a long welding ribbon to connect all laid-out battery cells. The ribbons are then cut regularly between adjacent battery cells before being welded to the battery string to form a series-connected battery string. This method significantly reduces welding workload and improves welding efficiency. The battery string welding equipment provided by the present invention significantly reduces welding workload and improves welding efficiency.

[0038] In some embodiments, the i-th laid solar cell is horizontally rotated 180° relative to the i-1-th laid solar cell, where i is a natural number greater than 1.

[0039] The adjacent cells are rotated 180° and laid out to ensure that the opposite electrode rows of the adjacent cells are pressed against the same solder strip.

[0040] 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, all even-numbered welding ribbons between the i-th battery cell and the i-1-th battery cell laid, and 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.

[0041] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a structural diagram of a back-connected battery cell in an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the structure of a welding support device in an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of the structure of the carrier platform in an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of laying welding strips in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the welding ribbon after cutting in an embodiment of the present invention;

[0047] Figure 6 Schematic diagram of welding of a welding device according to an embodiment of the present invention;

[0048] Figures 1 to 6 Included are:

[0049] Welding carrier device 10, spacing adjustment machine 11, carrier platform 12, bottom plate 111, slider 112, welding ribbon accommodating groove 121;

[0050] Welding mechanism 20;

[0051] Battery cell 100, first electrode array 101, second electrode array 102;

[0052] Welding ribbon 200 , first welding ribbon cut end 201 , second welding ribbon cut end 202 . 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 respectively includes four first electrodes and four second electrodes. 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 welding ribbon laying device, a battery cell laying device, a welding ribbon cutting device and a welding device, wherein:

[0061] like Figure 2 As shown, the welding carrier device 10 includes a plurality of carrier platforms 12 arranged on the same installation axis, and each carrier platform 12 is configured to carry a laid battery cell.

[0062] like Figure 4As shown, the welding ribbon laying device is configured to lay multiple welding ribbons 200 in parallel on multiple supporting platforms 12, wherein each welding ribbon 200 is laid parallel to the installation axis.

[0063] like Figure 5 As shown, the cell laying device is configured to lay multiple cell sheets 100 with the back side facing downward on multiple carriers 12, wherein each electrode column of the laid cell sheets 100 is pressed against the corresponding welding strip 200, and the polarity of the electrode columns pressed against the same welding strip 200 of adjacent cell sheets 100 located on adjacent carriers 12 is opposite.

[0064] The solder ribbon cutting device is configured to cut a plurality of solder ribbons 200 between adjacent battery cells 100 .

[0065] The welding device is configured to heat the battery cell 100 and the welding ribbon 200 to weld the welding ribbon 200 to the battery cell 100 , thereby forming a battery string connected in series.

[0066] It should be noted that, as an example, Figure 2 The welding carrier device 10 shown includes only five carrier platforms 12. However, in actual production, a battery string may be formed by welding a larger number of battery cells in series. Accordingly, the cut end of the welding carrier device 10 includes a larger number of five carrier platforms 12. Figure 4 and Figure 5 The battery string shown includes only four battery cells 100 .

[0067] As can be seen, the battery string welding equipment provided in this embodiment directly uses long welding ribbons to connect all laid-out battery cells, then regularly cuts the welding ribbons between adjacent battery cells, and finally welds the welding ribbons to the battery cells to form a battery string connected in series. 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.

[0068] Optionally, for the i-th battery cell being laid, the welding ribbon cutting device cuts off all odd-numbered welding ribbons between the i-th battery cell and the i-1-th battery cell being laid, and cuts off all even-numbered welding ribbons between the i-th battery cell and the i+1-th battery cell being laid, or, for the i-th battery cell being 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 being laid, and cuts off all odd-numbered welding ribbons between the i-th battery cell and the i+1-th battery cell being laid, where i is a natural number greater than 1.

[0069] For example, Figure 5In 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 first, third, and fifth welding ribbons, are severed by the welding ribbon cutting device. The three even-numbered welding ribbons located between the second and third battery cells, namely the second, fourth, and sixth welding ribbons, are severed by the welding ribbon cutting device. The three odd-numbered welding ribbons located between the third and fourth battery cells, namely the first, third, and fifth welding ribbons, are severed by the welding ribbon cutting device.

[0070] It can be seen that by cutting the welding ribbons 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.

[0071] Optional, such as Figure 3 and Figure 4 As shown, each carrier 12 is provided with a plurality of solder ribbon receiving grooves 121 extending parallel to the mounting axis. The solder ribbon laying device aligns the plurality of solder ribbons 200 with the plurality of solder ribbon receiving grooves 121 before laying them onto the multiple carriers 12. That is, after laying, each solder ribbon 200 is located within one of the solder ribbon receiving grooves 121 on each carrier 12. This ensures that the solder ribbons 200 are properly positioned, preventing them from accidentally slipping and losing effective contact with the electrode arrays on the cell 100.

[0072] Of course, to ensure effective contact between the solder ribbon 200 and the electrode arrays of the cell 100, the solder ribbon 200 must also protrude upward from the solder ribbon receiving groove 121. To achieve this, in some embodiments, the thickness of the solder ribbon 200 exceeds the depth of the solder ribbon receiving groove 121. This allows the solder ribbon 200 to naturally protrude from the solder ribbon receiving groove 121.

[0073] In some other embodiments, a solder strip lifting member is provided at the bottom of the solder strip accommodating groove 121 , and the solder strip 200 is lifted upward by the solder strip lifting member, so that the solder strip 200 can protrude upward from the solder strip accommodating groove 121 .

[0074] Optionally, the carrier 12 is further provided with a solder strip clamping mechanism located on the side of the solder strip accommodating groove 121, and the solder strip clamping mechanism is used to clamp the solder strip 200 and position it in the solder strip accommodating groove 121. In this way, the solder strip can be clamped and positioned in the solder strip accommodating groove 121.

[0075] 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 5Since 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.

[0076] In order to avoid short circuit fault, optional, such as Figure 2 As shown, the welding support device 10 in this embodiment further includes a spacing adjustment machine 11. A plurality of support platforms 12 are disposed on the spacing adjustment machine 11. The spacing adjustment machine 11 is used to adjust the spacing between the support platforms 12. Before the ribbon cutting device cuts the ribbon, the spacing between the support platforms 12 is a first spacing. After the ribbon cutting device cuts the ribbon, the spacing adjustment machine 11 adjusts the spacing between the support platforms 12 to a second spacing, where the second spacing is greater than the first spacing.

[0077] By driving the spacing adjustment machine 11, after the solder strips are cut, the spacing between the battery cells 100 can be increased, thereby ensuring that the two cut ends of each solder strip are completely separated, preventing the two cut ends of the solder strips from contacting each other and causing a short circuit.

[0078] 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. For example, in some embodiments, the target spacing between adjacent battery cells in the battery string after welding is 2 mm.

[0079] In these embodiments, the spacing between each support platform 12 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 12 is adjusted to 2 mm (i.e., the second spacing) through the spacing adjustment machine 11. In this way, it can be ensured that the two cut ends of each welding ribbon at the cutting point are completely separated, and it can also be ensured that the spacing between each adjacent battery cell is equal to the target spacing.

[0080] Continue to refer Figure 2 As shown, optionally, the spacing adjustment machine 11 includes a base plate 111, a plurality of sliders 112 slidably connected to the base plate 111, and a slider driving mechanism, wherein: each slider 112 is provided with a supporting platform 12, and the slider driving mechanism is used to drive the plurality of sliders 112 to slide on the base plate 111 to implement the spacing adjustment between each slider 112, that is, to implement the spacing adjustment of each supporting platform 12.

[0081] The battery string welding device in this embodiment may use a cutting device for cutting the welding ribbon, such as a cutter device, an ultrasonic cutting device, or a laser cutting device. The cutter device mechanically cuts the welding ribbon using a cutter, while the ultrasonic cutting device and the laser cutting device use ultrasonic and laser cutting, respectively, to cut the welding ribbon ultrasonically and laser.

[0082] When a cutter device is used to mechanically cut the welding strip, optionally, the following three implementation methods can be selected according to actual conditions.

[0083] In a first embodiment, the cutting device includes a first cutter that moves along the direction in which the cells are laid, sequentially cutting all odd-numbered ribbons or all even-numbered ribbons between adjacent cells. After the first cutter completes cutting the target ribbons between the current set of adjacent cells, it moves along the direction in which the cells are laid a first predetermined distance, approximately the length of one cell, to reach the next set of adjacent cells.

[0084] The cutter device of this embodiment is provided with only one set of cutters, so it can only cut the target ribbons between one set of corresponding solar cells at a time, and its ribbon cutting efficiency is not high. However, this cutter device has the advantages of simple structure and low cost.

[0085] In a second embodiment, the cutting device includes a third cutter and a fourth cutter arranged side by side. The third cutter and the fourth cutter move synchronously along the laying direction of the solar cells. While the third cutter cuts all odd-numbered solder ribbons or all even-numbered solder ribbons between the i-th solar cell and the (i-1)-th solar cell, the fourth cutter cuts all even-numbered solder ribbons or all odd-numbered solder ribbons between the i-th solar cell and the (i+1)-th solar cell. After the third and fourth cutters complete cutting the target solder ribbons between the current two groups of adjacent solar cells, they then synchronously move a second predetermined distance along the laying direction of the solar cells, the second predetermined distance being approximately twice the length of the solar cells.

[0086] Compared with the first embodiment, the cutter device in this embodiment is provided with two groups of cutters, which can simultaneously cut the target welding strips between two groups of adjacent battery cells, thereby improving the welding strip cutting efficiency.

[0087] The third embodiment: assuming that the total number of battery cells laid on the welding carrier is N, the cutting device is configured to include N-1 fifth cutters arranged side by side along the laying direction of the battery cells, and each fifth cutter corresponds to cutting off all odd-numbered welding strips or all even-numbered welding strips between a group of adjacent battery cells, where N is a natural number greater than 3.

[0088] The cutter device in this embodiment can cut the target welding ribbons between all adjacent battery cells at one time, thereby greatly improving the welding ribbon cutting efficiency.

[0089] like Figure 6 As shown, optionally, the welding device 20 in this embodiment includes a lifting drive mechanism and a heating mechanism, wherein: the heating mechanism is connected to the driving end of the lifting drive mechanism, and the lifting drive mechanism drives the heating mechanism to lift and lower.

[0090] After the cell laying device lays multiple cell sheets with their backs facing down on multiple carriers 12, the lifting drive mechanism drives the heating mechanism down so that the heating mechanism is close to or pressed against the cell sheets. The heating mechanism heats the cell sheets and solder strips, and all the solder strips can be soldered to the cell sheets.

[0091] Second embodiment

[0092] 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:

[0093] like Figure 4 As shown, a plurality of welding ribbons 200 are laid side by side on a plurality of supporting platforms 12 arranged on the same installation axis, wherein each welding ribbon 200 is parallel to the installation axis and is simultaneously supported on each supporting platform 12 .

[0094] like Figure 5 As shown, multiple battery cells 100 are laid with their backs facing downward on multiple carriers 12, wherein each carrier 12 is configured to carry a laid battery cell 100, and each electrode column of the laid battery cell 100 is pressed against the corresponding welding ribbon 200, and the polarity of the electrode columns of adjacent battery cells 100 located on adjacent carriers 12 pressed against the same welding ribbon 200 are opposite.

[0095] Cut off several welding ribbons between adjacent battery cells 100 .

[0096] The battery cells 100 and the soldering ribbons 200 are heated to solder the soldering ribbons 200 onto the battery cells 100 , thereby forming a battery string connected in series.

[0097] The battery string welding method provided in this embodiment uses a long welding ribbon to connect all laid-out battery cells, then cuts off several welding ribbons between adjacent battery cells according to a rule, and then welds the welding ribbons to the battery string to form a battery string connected in series. This greatly reduces the welding workload and improves welding efficiency.

[0098] Optionally, in order to ensure that opposite electrode columns of adjacent cells are pressed against the same welding strip, the laid i-th cell is horizontally rotated 180° relative to the laid i-1-th cell, where i is a natural number greater than 1.

[0099] In actual production, the cells can be placed in a straight line on a workbench. After placement, the i-th cell is horizontally rotated 180° relative to the i-1-th cell along the placement direction. Subsequently, the cell placement device directly places the placed cells onto the support platform 12 one by one or all at once. During the placement process, the cell placement device does not need to rotate the cells.

[0100] Of course, the cell laying device can also implement a 180° rotation of the cell, that is, after the cell laying device completes the laying of the i-1th cell, it needs to rotate the i-th cell 180° relative to the i-1th cell before laying.

[0101] Optionally, for the i-th cell being laid, all odd-numbered welding ribbons between the i-th cell and the i-1-th cell being laid, and all even-numbered welding ribbons between the i-th cell and the i+1-th cell being laid. Alternatively, for the i-th cell being laid, all even-numbered welding ribbons between the i-th cell and the i-1-th cell being laid, and all odd-numbered welding ribbons between the i-th cell and the i+1-th cell being laid, where i is a natural number greater than 1.

[0102] For example, Figure 5 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.

[0103] It can be seen that by cutting the welding ribbons 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.

[0104] 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 welding ribbon laying device, a battery cell laying device, a welding ribbon cutting device and a welding device, wherein: The welding carrier device includes a plurality of carrier platforms arranged on the same installation axis, each of the carrier platforms being configured to carry a laid battery cell; The welding ribbon laying device is configured to lay a plurality of welding ribbons in parallel on the plurality of supporting platforms, wherein each of the welding ribbons is parallel to the installation axis; The cell laying device is configured to lay multiple cell sheets on the multiple carriers with their backs facing downwards, wherein each electrode column of the laid cell sheets is pressed against a corresponding soldering tape, and adjacent cell sheets on adjacent carriers have electrode columns with opposite polarities pressed against the same soldering tape; The welding ribbon cutting device is configured to cut off a plurality of welding ribbons between adjacent battery cells; The welding device is configured to heat the battery cell and the welding ribbon to weld the welding ribbon to the battery cell, thereby forming a battery string connected in series; Each of the supporting platforms is provided with a plurality of welding ribbon accommodating grooves extending parallel to the installation axis, and the welding ribbon laying device aligns the plurality of welding ribbons with the plurality of welding ribbon accommodating grooves and then lays the welding ribbons on the plurality of supporting platforms, with the welding ribbons protruding from the welding ribbon accommodating grooves; The welding carrier device further includes a spacing adjustment machine, wherein the plurality of carriers are arranged on the spacing adjustment machine, and the spacing adjustment machine is used to adjust the spacing between the carriers; wherein: Before the welding ribbon cutting device cuts the welding ribbon, the distance between the supporting platforms is a first distance; After the solder ribbon cutting device cuts the solder ribbon, the spacing adjustment machine adjusts the spacing between the supporting platforms 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: For the i-th cell being laid, the ribbon cutting device cuts off all odd-numbered ribbons between the i-th cell and the i-1-th cell being laid, and cuts off all even-numbered ribbons between the i-th cell and the i+1-th cell being laid, or, For the i-th cell being laid, the ribbon cutting device cuts off all even-numbered ribbons between the i-th cell and the i-1-th cell being laid, and cuts off all odd-numbered ribbons between the i-th cell and the i+1-th cell being laid. Wherein, i is a natural number greater than 1.

3. The battery string welding equipment according to claim 1, characterized in that The thickness of the soldering strip exceeds the depth of the soldering strip accommodating groove.

4. The battery string welding equipment according to claim 1, characterized in that: A solder strip lifting piece is provided at the bottom of the solder strip accommodating groove, and the solder strip lifting piece is used to lift the solder strip upward so that the solder strip protrudes from the solder strip accommodating groove.

5. The battery string welding equipment according to claim 1, characterized in that: The supporting platform is further provided with a solder strip clamping mechanism located at the side of the solder strip accommodating groove, and the solder strip clamping mechanism is used to clamp and position the solder strip into the solder strip accommodating groove.

6. 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 bottom plate to adjust the spacing between the sliders; Each of the sliding blocks is provided with a bearing platform.

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

8. The battery string welding equipment according to claim 7, characterized in that: The cutting device includes a first cutting knife, which moves along the laying direction of the battery cells and sequentially cuts off all odd-numbered welding ribbons or all even-numbered welding ribbons between adjacent battery cells; or The cutting device includes a third cutter and a fourth cutter arranged side by side, and the third cutter and the fourth cutter move synchronously along the laying direction of the battery cells. When the third cutter 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 cutter 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 cutter device includes N-1 fifth cutters arranged side by side along the laying direction of the battery cells, and each of the five cutters corresponds to cutting off all odd-numbered welding strips or all even-numbered welding strips between a group of adjacent battery cells, where N is a natural number greater than 3.

9. The battery string welding equipment according to claim 1, characterized in that: The welding device includes a lifting drive mechanism and a heating mechanism, wherein: the heating mechanism is connected to the driving end of the lifting drive mechanism, and the lifting drive mechanism drives the heating mechanism to rise and fall; After the battery cell laying device lays multiple battery cells with their backs facing downward on the multiple supporting platforms, the lifting drive mechanism drives the heating mechanism to descend so that the heating mechanism is close to or pressed against the battery cells, and the heating mechanism heats the battery cells and the welding ribbons to weld the welding ribbons to the battery cells.

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 is implemented by the battery string welding device according to any one of claims 1 to 9, and the battery string welding method includes: Laying multiple welding ribbons side by side on multiple supporting platforms arranged on the same installation axis, wherein each welding ribbon is parallel to the installation axis and is simultaneously supported on each supporting platform; Laying multiple solar cells with their backs facing downward on the multiple carriers, wherein each carrier is configured to carry a solar cell to be laid, and each electrode column of the laid solar cells is pressed against the corresponding welding ribbon, and the polarity of the electrode columns of adjacent solar cells on adjacent carriers pressed against the same welding ribbon is opposite; Cut off several welding ribbons between adjacent battery cells; The battery cells and the soldering ribbons are heated to solder the soldering ribbons to the battery cells, thereby forming a battery string connected in series.

11. The battery string welding method according to claim 10, wherein: The i-th cell sheet laid out is horizontally rotated 180° relative to the i-1-th cell sheet 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 being laid, all odd-numbered welding ribbons between the i-th cell and the i-1-th cell being laid, and all even-numbered welding ribbons between the i-th cell and the i+1-th cell being laid, or, For the i-th cell being laid, all even-numbered welding ribbons between the i-th cell and the i-1-th cell being laid, and all odd-numbered welding ribbons between the i-th cell and the i+1-th cell being laid, Wherein, i is a natural number greater than 1.

Images