Battery string welding system

Abstract

The utility model discloses a battery string welding system. The battery string welding system can comprise two conveying parts which are oppositely arranged and a detachable clamping device, and each conveying part is provided with a plurality of grooves; the grooves formed in the two conveying parts are in one-to-one correspondence; the detachable clamping device comprises a plurality of clamping parts and mounting parts arranged at the two ends of each clamping part. The mounting part is matched with the groove; the mounting parts of the two clamping parts are clamped in the two corresponding grooves in the two conveying parts in a stacked mode to form a clamping set. And the clamping group is used for clamping and positioning the battery piece and the welding strip. According to the battery string welding system, the battery piece and the welding strip are clamped and fixed through the clamping set composed of the two clamping parts, the battery string welding system participates in the welding and gluing steps of the battery string in the whole process, the occurrence rate of grid breaking, desoldering, degumming and other defects in the series connection process of the battery string is reduced, meanwhile, the battery piece and the welding strip can be well stabilized, and the yield of the battery string is effectively increased.

Description

Technical Field

[0001] The utility model relates to a battery string welding system. Background Art

[0002] At present, in the production process of battery strings, it is necessary to stack the battery cells and welding strips on the battery string laying platform provided by the string welding machine, which is integrated with the conveying part, and use the flux or adhesive pre-applied on the battery cells to initially fix the welding strips on the battery cells. After the welding strips initially fix the battery cells, the initial series connection between the battery cells is achieved. After the battery cells are initially connected in series, the battery string is transported to the welding table for welding, and the battery string is transported to the curing mechanism to cure the glue points on the battery string. The battery string welding process, curing process and transportation process will inevitably lead to the displacement of battery cells and welding strips.

[0003] In addition, although the existing battery string welding machine uses a pressing fixture to press the battery string, the pressing fixture and the platform provided by the battery string welding machine for laying the battery cells and welding strips are two relatively independent components and cannot fit well. For example, when the pressure applied by the pressing fixture is relatively small, it is difficult to stabilize the battery cells and welding strips. If the force applied by the pressing fixture is too great, the battery cells will break. Therefore, the battery string welding machine used in the existing battery string production process has a relatively large negative impact on the battery string production yield. Utility Model Content

[0004] In view of this, the utility model provides a battery string welding system, which completes welding and gluing of battery strings manufactured by the battery string welding system while being fixed by a clamping component all the time, avoiding the risks of debonding, desoldering, grid breakage, etc. caused by transportation without pressure tool protection, and can better stabilize battery cells and welding strips, effectively improving the yield rate of serially connected battery strings.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a battery string welding system, comprising: two conveying parts arranged opposite to each other and a detachable clamping device, wherein:

[0007] Each of the transmission parts is provided with a plurality of grooves;

[0008] The grooves provided on the two conveying parts correspond to each other one by one;

[0009] The detachable clamping device comprises a plurality of clamping components and mounting portions arranged at both ends of each of the clamping components;

[0010] The mounting portion matches the groove;

[0011] The mounting parts of the two clamping components are stacked and clamped on the two corresponding grooves on the two conveying parts to form a clamping group;

[0012] The clamping group is used to clamp and position the battery sheet and the welding strip.

[0013] The technical solution of the first aspect of the above utility model has the following advantages or beneficial effects:

[0014] The battery string welding system provided by the embodiment of the utility model is composed of a clamping group through which the mounting parts of two clamping parts are stacked and clamped on the corresponding two grooves on the conveying part, so that the battery cell and the welding strip are located between the two stacked clamping parts, that is, the clamping group clamps and positions the battery cell and the welding strip. During the conveying process of the conveying part, the clamping group always clamps and positions the battery cell and the welding strip. At the same time, the battery and the welding strip are always welded, glued, and cured under the clamping and positioning state of the clamping group, avoiding the occurrence of grid breakage, desoldering, degumming, etc. in the battery string due to transportation in an unfixed state, effectively improving the yield rate of the battery string connected in series. The displacement of the battery cell and the welding strip can be avoided, and the battery cell and the welding strip can be stabilized during the welding process of the battery cell and the welding strip, avoiding the occurrence of hidden cracks in the battery cell, so as to further effectively improve the yield rate of the battery string connected in series. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial structural schematic diagram of a battery string welding system according to an embodiment of the utility model;

[0016] Figure 2 is a schematic cross-sectional view of a portion of the structure of a transmission unit according to an embodiment of the utility model;

[0017] Figure 3 is a schematic diagram of the main surface of the clamping component mounted on the conveying part facing away from the battery cell according to an embodiment of the utility model;

[0018] Figure 4 is a schematic diagram of the main surface of the clamping component mounted on the conveying part facing the battery cell according to an embodiment of the utility model;

[0019] Figure 5 It is a partial structural schematic diagram of a dispensing device according to an embodiment of the utility model;

[0020] Figure 6 It is a main flow chart of a battery string welding method according to an embodiment of the utility model.

[0021] The reference numerals are as follows:

[0022] 10-transmission part; 11-groove; 20-detachable clamping device; 21-clamping component; 211-glue dispensing hole; 22-installation part; 30-heating device; 31-upper heating part; 32-lower heating part; 40-glue dispensing device; 41-upper glue dispensing part; 42-lower glue dispensing part; 50-curing device; 51-upper curing light box; 52-lower curing light box. DETAILED DESCRIPTION

[0023] The battery string welding system involved in the embodiment of the utility model is mainly used in the field of photovoltaic module production, and is mainly aimed at the process of connecting battery cells in series into battery strings (connecting battery cells in series into battery strings through electrical connectors such as welding strips).

[0024] The conveying part involved in the embodiment of the utility model mainly plays the role of transporting and stabilizing the detachable clamping device, and does not contact the battery cell and the welding ribbon. That is, the conveying part does not directly carry the battery cell and the welding ribbon.

[0025] The stacking of two components involved in the embodiments of the present invention generally means that the two components overlap in the vertical direction, and the two components are in direct or indirect contact. For example, the stacking of the mounting portions 22 of two clamping components 21 means that the mounting portion 22 of one clamping component 21 is located above the mounting portion 22 of the other clamping component 21 and overlaps, and the mounting portion 22 of one clamping component 21 is in direct contact with the mounting portion 22 of the other clamping component 21.

[0026] As described in the background technology, in the existing battery string welding system, the battery string is usually transported to the next process without a press to fix it, which is prone to the risk of desoldering, grid breakage, debonding, etc. In particular, for 0BB components with reduced silver consumption, the above risks are more likely to occur; and although the solution of first dispensing glue and then welding can initially stabilize the welding strip through the dispensing step, and participate in bearing the force of the welding point between the welding strip and the fine grid, on the one hand, the insulating glue between the welding strip and the battery cell isolates the contact between the welding strip and the fine grid and / or ITO, affecting the conductivity. In this method of first dispensing glue and then placing the welding strip, the size or thickness of the glue point (the glue point is too large or relatively thick, which will provide the welding strip with a supporting force away from the grid line) directly affects the reliability of the contact between the welding strip and the grid line, and is prone to problems such as cold welding, desoldering, and grid breakage; on the other hand, this method of first dispensing glue and then placing the welding strip will reduce the contact area between the welding strip and the grid line and / or the conductive layer, affecting the conductivity and power transmission.

[0027] Although there are some existing solutions of welding first and then gluing (that is, in the existing solution of welding first and then gluing, the welding strip is first welded to the surface of the battery through an infrared light box, and then it is moved to the gluing and curing mechanism to complete the production of the battery string), however, due to the low bonding force between the welding strip and the fine grid, in the existing solution of welding first and then gluing, at least two fixed points are still required on the surface of the battery for fixing the welding strip in the welding step; at the same time, in the existing solution, the transportation (transportation by adsorption) of the battery string is usually achieved by transportation, so there are still risks of desoldering, broken grid, degumming and other defects. In addition, even if the tooling is used for pressing in the existing solution, the tooling press still needs to be removed after the welding of the battery string in order to adsorb the battery string after welding and transport it to the gluing section. This step will also cause an increase in the number of defective battery strings. Therefore, the cost of photovoltaic modules produced by the existing solution of welding first and then gluing is still relatively high, and the defective rate during production is also relatively high.

[0028] The embodiment of the utility model improves the battery string welding system and improves the battery string welding process based on the battery string welding system. The battery and the welding strip in the utility model are always welded, glued and cured in the state of clamping and positioning of the clamping group, avoiding the battery string from being transported in an unfixed state, resulting in grid breakage, desoldering, degumming and other defects, and effectively improving the yield rate of the serially connected battery string. It can effectively improve the yield rate of the battery string and help improve the performance of the battery string.

[0029] in, Figure 1 A partial structural schematic diagram of a battery string welding system provided by an embodiment of the utility model is shown; Figure 2 A partial structural cross-sectional schematic diagram of a transmission unit provided by an embodiment of the utility model is shown; Figure 3 A schematic diagram showing the main surface of the clamping component mounted on the conveying part facing away from the battery sheet provided by an embodiment of the utility model; Figure 4 A schematic diagram showing the main surface of the clamping component mounted on the conveying part facing the battery sheet provided by an embodiment of the utility model; Figure 5 A partial structural schematic diagram of a glue dispensing device provided in an embodiment of the utility model is shown.

[0030] like Figure 1 As shown, the embodiment of the utility model provides a battery string welding system. The battery string welding system may include: two conveying parts 10 arranged opposite to each other and a detachable clamping device 20, wherein:

[0031] Each conveying portion 10 is provided with a plurality of grooves 11;

[0032] The grooves 11 provided on the two conveying parts 10 correspond to each other one by one;

[0033] The detachable clamping device 20 includes a plurality of clamping components 21 and mounting portions 22 disposed at both ends of each clamping component 21;

[0034] The mounting portion 22 matches the groove 11;

[0035] The mounting parts 22 of the two clamping members 21 are stacked and clamped in the two corresponding grooves 11 on the two conveying parts 10 to form a clamping group;

[0036] The clamping group is used to clamp and position the battery cells and solder strips.

[0037] The width of the clamping component 21 is generally equal to or slightly wider than the width of the battery cell.

[0038] In the transmission direction of the conveying part 10, a plurality of clamping groups are placed side by side. No gap is provided between adjacent clamping groups to facilitate the placement of the battery cells.

[0039] That is, the battery cell and the welding ribbon are held between the relative clamping components 21 and clamped by the relative clamping components 21 during the welding process, the glue dispensing process and the curing process.

[0040] Among them, Figure 1 As shown, the parts of the two conveying parts 10 that are arranged opposite to each other and that are in contact with the clamping part 21 are parallel, and the transmission directions of the two conveying parts 10 are exactly the same. And the distance between the two conveying parts 10 can accommodate the part of the clamping part 21 that is used to support the battery sheet.

[0041] In addition, a flexible material is provided on the main surface of the clamping component 21 that contacts the battery cell to play a buffering role to further avoid squeezing the battery cell.

[0042] The transmission principle of the two transmission parts 10 is the same as the transmission principle of the existing conveyor belt, which will not be repeated here.

[0043] The groove 11 provided on the transmission part 10 can be Figure 2 The grooves 11 are spaced apart and evenly distributed in the transmission direction of the conveying portion 10 .

[0044] like Figure 3 As shown, each clamping member 21 generally has two mounting portions 22, and the two mounting portions 22 are respectively arranged on the wide sides of the clamping member 21. The structure of the mounting portion 22 matches the structure of the groove 11, so that the mounting portion 22 can be stably engaged in the groove 11. In addition, the mounting portion 22 can also include various protrusion structures, and correspondingly, the groove 11 includes a concave structure matching the protrusion structure to better stabilize the clamping member 21.

[0045] Further, for each clamping member 21, as Figure 4As shown, a welding strip fixing groove 212 for fixing the welding strip is provided on the main surface of each clamping component 21 facing the battery cell. The welding strip fixing groove 212 is used to limit and fix the welding strip. For the main surface of each clamping component 21 facing the battery cell, the other area except the welding strip fixing groove 212 is in contact with the surface of the battery cell to better fix the welding strip and the battery cell.

[0046] The battery string welding system provided by the embodiment of the utility model is composed of a clamping group formed by stacking the mounting parts of two clamping components and engaging with the corresponding two grooves on the conveying part, so that the battery cell and the welding strip are located between the two stacked clamping components, that is, the clamping group clamps and positions the battery cell and the welding strip, and the battery cell and the welding strip are always welded, glued, and cured under the clamping and positioning state of the clamping group, avoiding the occurrence of grid breakage, desoldering, degumming, and other defects in the battery string caused by transportation without a fixed state, effectively improving the yield rate of the battery string connected in series. At the same time, during the conveying process of the conveying part, the displacement of the battery cell and the welding strip can be avoided, and the battery cell and the welding strip can be stabilized during the welding process of the battery cell and the welding strip, avoiding the occurrence of hidden cracks in the battery cell, so as to effectively improve the yield rate of the battery string connected in series.

[0047] In addition, in the battery string welding system provided by the embodiment of the utility model, the battery cell and the welding strip are located between two stacked clamping parts, and the upper clamping part 21 relies on a part of its own gravity to press the battery cell and the welding strip, so that the battery cell and the welding strip and the clamping group that clamps the battery cell and the welding strip become a whole. Once the lower clamping part 21 moves slightly due to the shaking of the conveying part 10, the battery cell and the welding strip will also move with it, and the upper clamping part 21 will also move with the battery cell and the welding strip, keeping the pressure on the battery cell and the welding strip, so as to avoid the displacement of the welding strip. Moreover, the relative position between the clamping part 21 below the clamping part and the upper clamping part 21 remains unchanged, so the pressure applied to the battery cell and the welding strip will not change, so that the battery cell and the welding strip are subjected to balanced pressure throughout the process, avoiding the battery cell from being broken or cracked due to excessive pressure.

[0048] Furthermore, in order to facilitate the disassembly and assembly of the clamping member 21, a first magnetic attraction component may be provided on the above-mentioned groove 11; the mounting portion 22 may include a second magnetic attraction component; the second magnetic attraction components included in the mounting portions 22 of the two clamping members 21 in the clamping group attract each other; the second magnetic attraction component included in the mounting portion 22 of one clamping member 21 in the clamping group attracts each other with the first magnetic attraction component provided in the groove 11. That is, by means of magnetic attraction, the mounting portions 22 of the two clamping members 21 are firmly fixed in the groove 11, and the mounting portions 22 of the two clamping members 21 are relatively fixed, so that the two clamping members 21 are relatively fixed.

[0049] Specifically, the two clamping parts 21 in the clamping group enclose a cavity for accommodating the battery cell and the welding strip; the two clamping parts 21 in the clamping group are in contact with the welding strips on both sides of the battery cell respectively. The two clamping parts 21 enclose a cavity for accommodating the battery cell and the welding strip, and even if the two clamping parts 21 in the clamping group move up and down, the relative positions of the two clamping parts 21 are essentially unchanged, so the cavity enclosed by the two clamping parts 21 for accommodating the battery cell and the welding strip will not change, so as to further ensure that during the entire process of serially connecting the battery cells, the battery cell and the welding strip are always in a cavity whose size and space do not change, thereby avoiding displacement of the battery cell and the welding strip.

[0050] Furthermore, if Figure 1 As shown, the battery string welding system may further include: a heating device 30 and a glue dispensing device 40, wherein:

[0051] The heating device 30 and the glue dispensing device 40 are arranged in sequence along the transmission direction of the conveying part 10;

[0052] The heating device 30 is used to heat the solder strip and fix it on the battery cell;

[0053] The glue dispensing device 40 is used to dispense fixing glue on the soldering strip fixed on the battery cell, so as to reinforce the soldering strip on the battery cell.

[0054] The heating device 30 may be heated by infrared heating. In the case of infrared heating, the clamping member 21 may be made of a transparent material to ensure that infrared light can pass through the clamping member 21 and irradiate the battery cell and the soldering strip, heating the soldering strip to form a weld between the soldering strip and the battery cell.

[0055] like Figure 1 The transmission direction of the conveying part 10 is A→B, and the heating device 30 and the glue dispensing device 40 are arranged in the transmission direction A→B, and the laid battery cells and solder strips in the clamping group first pass through the heating device 30 and then pass through the glue dispensing device 40.

[0056] Through this structural design, in the battery string connection process of the battery string welding system, the welding ribbon is first welded to the battery cell, and then the welded welding ribbon is further stabilized by glue dispensing, that is, the glue is dispensed on the welding ribbon. Compared with first dispensing glue and then laying the welding ribbon, the battery string welding system provided by the embodiment of the utility model provides a process of first welding and then glue dispensing, which can avoid the influence of glue dispensing on welding of welding ribbon, and can also improve the contact stability between the welding ribbon and the grid line and / or the conductive layer, and ensure the electrical connection between the welding ribbon and the grid line or the conductive layer.

[0057] Furthermore, in order to improve the yield rate of battery string production. The cooling method of the above-mentioned heating device 30 generally adopts gradient cooling, and continues to cool down after keeping warm for 5 to 10 seconds at each gradient temperature. For example, each gradient temperature can be kept warm for 5s, 6s, 7s, 8s, 9s, 10s, etc. Through gradient cooling, after the welding strip and the grid line are welded, the welding strip that is heated and expanded can be slowly cooled during the gradient cooling process, so that the welding strip slowly shrinks and releases relatively small stress on the battery cell, thereby avoiding hidden cracks in the battery cell, so as to further improve the yield rate of the battery string.

[0058] The clamping component 21 provided in the embodiment of the utility model includes distributed dispensing holes 211, wherein the dispensing holes 211 correspond to the dispensing positions on the battery cell; the dispensing device 40 dispenses fixed glue through the dispensing holes 211. The dispensing holes 211 pass through the two main surfaces of the same clamping component 21 (in the process of clamping the battery cell, the two main surfaces are parallel to the battery cell). Dispensing glue through the dispensing holes 211 can enable the clamping component 21 to cover the battery cell as a whole, so that the battery cell is subjected to balanced pressure, avoiding uneven force on the battery cell to cause hidden cracks or splits.

[0059] At the same time, during the battery stringing process, from welding to glue dispensing steps, the battery surface is always fixed by the clamping components, avoiding the steps of removing the tooling after the battery string welding and transporting it to the glue dispensing device; avoiding the problems of broken grids and desoldering caused by adsorption and transportation of the battery string.

[0060] It is worth noting that the dispensing through hole 211 included in the clamping component 21 can meet the dispensing requirements of one or more types of battery cells, so that the clamping component 21 can be applied to dispensing of different types, thereby improving the practicality and utilization rate of the clamping component 21 and effectively controlling equipment costs.

[0061] Among them, Figure 1 As shown, the heating device 30 may include: an upper heating part 31 and a lower heating part 32, the upper heating part 31 and the lower heating part 32 corresponding to each other; the upper heating part 31 is located above the clamping group; the lower heating part 32 is located below the clamping group. The upper heating part 31 and the lower heating part 32 heat the same area of ​​the battery string synchronously. The distance from the upper heating part 31 to the upper surface of the battery cell in the clamping group is the same as the distance from the lower heating part 32 to the lower surface of the battery cell in the clamping group.

[0062] By providing corresponding upper heating parts 31 and lower heating parts 32, the upper heating parts 31 and lower heating parts 32 heat the same area of ​​the battery string at the same time, so that the upper and lower surfaces of the battery cells are heated evenly, avoiding bending of the battery cells due to uneven heating of the battery cells, thereby further improving the yield rate of the battery string.

[0063] Furthermore, if Figure 1 As shown, the glue dispensing device 40 includes: an upper glue dispensing part 41 and a lower glue dispensing part 42, wherein the upper glue dispensing part 41 corresponds to the lower glue dispensing part 42; the upper glue dispensing part 41 is located above the clamping group; the lower glue dispensing part 42 is located below the clamping group. The upper glue dispensing part 41 and the lower glue dispensing part 42 are synchronously glued to the same area of ​​the battery string. The structures of the upper glue dispensing part 41 and the lower glue dispensing part 42 are basically the same. Specifically, Figure 5 Taking the structure of the upper dispensing part 41 as an example, the upper dispensing part 41 may include an air pump 411 for squeezing glue and arranged dispensing needles 412. The dispensing needles 412 pass through the dispensing through holes 211, and when the air pump 411 applies pressure, the glue used to fix the solder strip is dispensed onto the solder strip and the battery cell through the dispensing needles 412.

[0064] By setting corresponding upper glue dispensing parts 41 and lower glue dispensing parts 42, the upper glue dispensing parts 41 and the lower glue dispensing parts 42 dispense glue to the same area of ​​the battery string at the same time. During the dispensing process, the upper glue dispensing parts 41 and the lower glue dispensing parts 42 apply forces of opposite directions and equal strength to the battery cells, which cancel each other out, so as to avoid displacement of the battery cells and the solder strips during the dispensing process. Compared with the traditional scheme of applying glue on one side and then flipping over and applying glue on the other side, or the double-sided gluing scheme without press protection, the present scheme completes the gluing when the battery string is always fixed by the clamping member, thereby avoiding the risks of debonding, desoldering, grid breakage, etc. caused by flipping over without press protection, thereby further improving the yield rate of the battery string.

[0065] Furthermore, if Figure 1 As shown, the battery string welding system further includes: a curing device 50 disposed behind the glue dispensing device 40 in the transmission direction of the conveying part 10, wherein the curing device 50 is used to cure the glue. The curing device 50 is disposed behind the glue dispensing device 40, which means that in the process of transmitting the battery cell placed between the clamping groups through the conveying part 10, the battery cell first passes through the glue dispensing device 40 and then passes through the curing device 50.

[0066] Among them, the curing device 50 may include: an upper curing light box 51 and a lower curing light box 52, the upper curing light box 51 and the lower curing light box 52 correspond to each other; the upper curing light box 51 is located above the clamping group; the lower curing light box 52 is located below the clamping group. So that the upper and lower surfaces of the battery string passing through the curing device 50 are evenly heated, the battery sheet is prevented from bending, and the yield rate of the battery string is further improved. At the same time, compared with the traditional solution of removing the tooling after welding and adsorbing and transporting the battery string to the next process, the battery string after welding in this solution is transferred to the next process under the fixation of the clamping member to complete the gluing, avoiding the risk of desoldering and broken grid caused by the transportation without the protection of the press. In particular, for the main grid-free battery, the bonding force between the welding strip and the fine grid is weak. When the traditional solution is used for welding, the incidence of desoldering and broken grid will be greatly increased. If the traditional solution is used for welding, the main grid-free battery needs to add silver points to fix the welding strip, which increases the manufacturing cost of the component; while when the present solution is used, the battery string is always fixed by the clamping member, avoiding the increase of silver consumption.

[0067] The curing device 50 may adopt ultraviolet light curing, that is, ultraviolet lamp tubes may be arranged in the upper curing light box 51 and the lower curing light box 52. Accordingly, the glue dispensed by the glue dispensing device 40 is ultraviolet light curing glue.

[0068] Furthermore, the battery string welding system further comprises: a controller (not shown in the figure), wherein Figure 5 The dispensing needles 412 arranged in the array shown are retractable dispensing needles; the controller is used to adjust the retractable dispensing needles 412 arranged in the array according to the dispensing holes 211 distributed on the clamping part 21 or the pattern of the battery cell. Through the retractable setting of the dispensing needles 412, it cooperates with the controller, and the controller can control the dispensing needles 412 to extend or retract, so that the extended dispensing needles 412 match the dispensing holes 211 or the pattern of the battery cell, so that when there are differences in the dispensing positions of battery cells of different patterns, the dispensing needles 412 can be controlled by the controller to retract, which can meet the dispensing needs of battery cells of different patterns, so as to effectively control the equipment cost of producing battery strings.

[0069] Furthermore, the battery string welding system also includes: a photographing device (not shown in the figure) installed on the dispensing device 40, wherein the photographing device is used to photograph the main surface of the clamping component 21; the controller analyzes the image captured by the photographing device to determine the distribution of the dispensing holes 211 on the clamping component 21. The distribution of the dispensing holes 211 can be determined by using existing image processing methods, which will not be repeated here. By cooperating with the photographing device and the controller, the extension and retraction of the dispensing needle 412 can be automatically adjusted, so that the battery string connection process can be fully automated.

[0070] It is worth noting that the various parameters used in the battery string welding system provided in the embodiment of the utility model to prepare the battery string process, such as the heating temperature of the heating device 30, the amount of glue dispensed, the curing parameters, etc., can be set according to the actual battery cell and welding strip requirements.

[0071] Furthermore, the present utility model embodiment provides a battery string welding method implemented by using the battery string welding system provided in the above embodiment. Figure 6 As shown, the battery string welding method may include:

[0072] Step S601: placing two clamping components 21 side by side in two adjacent grooves 11 of the conveying part 10;

[0073] By placing two clamping components 21 side by side first, it is convenient to support the welding strip above the end battery cell later.

[0074] Step S602: Laying a soldering tape on a clamping component 21, and laying a battery cell on the soldering tape;

[0075] The following steps S603 and S604 are executed repeatedly until the battery string is laid out:

[0076] Step S603: Laying a welding ribbon on the current last battery cell of the battery string and the next clamping component 21 adjacent to the current last battery cell;

[0077] The last cell currently refers to the last cell currently laid in the transmission direction of the transmission unit 10, and does not specifically refer to the end cell of the battery string. For example, if only one cell is currently laid, then this cell is the last cell currently. For another example, if two cells are currently laid, then the second cell that was laid last is the last cell currently.

[0078] The next clamping component 21 is relative to the last cell currently, and is essentially the clamping component 21 that is laid after the last cell currently and is needed by the cell adjacent to the last cell currently.

[0079] Step S604: placing the next battery cell located above the next clamping component 21 and the clamping component 21 located above the current last battery cell at the same time.

[0080] By placing the next battery cell located above the next clamping component 21 and the clamping component 21 located above the current last battery cell at the same time, on the one hand, the production efficiency of the battery string can be improved; on the other hand, the welding strip can be better stabilized.

[0081] Furthermore, if Figure 6 As shown, the battery string welding method may further include:

[0082] Step S605: The arranged battery string is transported to a position corresponding to the heating device 30 by the conveying unit, and the heating device 30 heats the battery string so that the welding ribbon of the battery string is welded to the battery cell;

[0083] Step S606: The battery string after welding is transported to a position corresponding to the glue dispensing device 40 by the conveying unit, and glue is dispensed on the welding ribbon and the battery cell by the glue dispensing device 40 .

[0084] Through the above process, during the production of the battery string, glue is dispensed after welding, which can effectively improve the welding stability between the welding ribbon and the battery cell, ensure the contact area between the welding ribbon and the grid line or the conductive layer, and effectively improve the current conduction capacity of the battery string.

[0085] Among them, step S605 includes: the heating device 30 performs a gradient cooling process, wherein each gradient temperature is maintained for 5 to 10 seconds before continuing to cool. For example, each gradient temperature can be kept warm for 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds, etc. Through gradient cooling, after the welding strip and the grid line are welded, the welding strip that is heated and expanded can be slowly cooled during the gradient cooling process, so that the welding strip slowly shrinks and releases relatively small stress on the battery cell, thereby avoiding hidden cracks in the battery cell, so as to further improve the yield rate of the battery string.

[0086] Furthermore, if Figure 6 As shown, the battery string welding method may further include:

[0087] Step S607: The battery string after the dispensing is transported to the corresponding curing device 50 through the conveying unit, and the glue points formed by the dispensing are cured by the curing device 50.

[0088] By curing the glue dots formed by the glue dispensing through the curing device 50, the glue dots can be cured quickly, thereby improving the production efficiency of the battery string.

[0089] It is worth noting that the solution of the battery string welding method provided in the embodiment of the utility model can be used for connecting battery cells with main grids in series into battery strings, and can also be used for connecting battery cells without main grids in series into battery strings. Preferably, it is used for connecting battery cells without main grids in series into battery strings. In particular, for connecting battery cells without main grids in series into battery strings, the solution can reduce the incidence of defects such as broken grids, desoldering, and debonding without increasing the silver consumption of the main grids; at the same time, while positioning the welding strip relatively well, it can avoid the deviation of the welding strip, and by dispensing glue after welding, it can better stabilize the welding strip while avoiding the influence of dispensing glue on welding.

[0090] In summary, the embodiments of the present invention provide the following technical solutions:

[0091] Technical Solution 1: A battery string welding system, comprising: two conveying parts 10 arranged opposite to each other and a detachable clamping device 20, wherein:

[0092] Each of the transmission parts 10 is provided with a plurality of grooves 11;

[0093] The grooves 11 provided on the two conveying parts 10 correspond to each other one by one;

[0094] The detachable clamping device 20 includes a plurality of clamping components 21 and mounting portions 22 disposed at both ends of each of the clamping components 21;

[0095] The mounting portion 22 matches the groove 11;

[0096] The mounting portions 22 of the two clamping members 21 are stacked and clamped on the corresponding two grooves 11 on the two conveying parts 10 to form a clamping group;

[0097] The clamping group is used to clamp and position the battery sheet and the welding strip.

[0098] Technical solution 2: The battery string welding system according to technical solution 1,

[0099] A first magnetic attraction component is disposed on the groove 11;

[0100] The mounting portion 22 includes a second magnetic attraction component;

[0101] The second magnetic components included in the mounting portions 22 of the two clamping members 21 in the clamping group attract each other;

[0102] The second magnetic attraction component included in the mounting portion 22 of one of the clamping components 21 in the clamping group and the first magnetic attraction component provided in the groove 11 attract each other.

[0103] Technical solution 3: The battery string welding system according to technical solution 1 or 2,

[0104] The two clamping members 21 in the clamping group enclose a cavity for accommodating the battery cell and the welding ribbon;

[0105] The two clamping components 21 in the clamping group are in contact with the welding strips on both sides of the battery cell respectively.

[0106] Technical solution 4: The battery string welding system according to technical solution 1 further includes: a heating device 30 and a dispensing device 40, wherein:

[0107] The heating device 30 and the glue dispensing device 40 are arranged in sequence along the transmission direction of the conveying part 10;

[0108] The heating device 30 is used to heat the soldering ribbon and fix it on the battery cell;

[0109] The glue dispensing device 40 is used to dispense fixing glue on the soldering strip fixed on the battery cell, so as to reinforce the soldering strip on the battery cell.

[0110] Technical Solution 5: According to the battery string welding system described in Technical Solution 4, the clamping component 21 includes distributed dispensing holes 211, wherein:

[0111] The glue dispensing through hole 211 corresponds to the glue dispensing position on the battery cell;

[0112] The glue dispensing device 40 dispenses fixing glue through the glue dispensing through hole 211 .

[0113] Technical Solution 6: According to the battery string welding system described in Technical Solution 4, the heating device 30 includes: an upper heating part 31 and a lower heating part 32, wherein:

[0114] The upper heating part 31 corresponds to the lower heating part 32;

[0115] The upper heating part 31 is located above the clamping group;

[0116] The lower heating portion 32 is located below the clamping group.

[0117] Technical Solution 7: According to the battery string welding system described in Technical Solution 4, the glue dispensing device 40 includes: an upper glue dispensing part 41 and a lower glue dispensing part 42, wherein:

[0118] The upper glue dispensing portion 41 corresponds to the lower glue dispensing portion 42;

[0119] The upper glue dispensing portion 41 is located above the clamping group;

[0120] The lower glue dispensing portion 42 is located below the clamping group.

[0121] Technical solution 8: The battery string welding system according to any one of technical solutions 4 to 7 further includes: a curing device 50 arranged behind the dispensing device 40 in the transmission direction of the conveying part 10, wherein:

[0122] The curing device 50 is used to cure the fixing glue.

[0123] Technical Solution 9: According to the battery string welding system described in Technical Solution 8, the curing device 50 includes: an upper curing light box 51 and a lower curing light box 52, wherein:

[0124] The upper curing light box 51 corresponds to the lower curing light box 52;

[0125] The upper curing light box 51 is located above the clamping group;

[0126] The lower curing light box 52 is located below the clamping group.

[0127] Technical solution 10: The battery string welding system according to any one of technical solutions 4 to 7 further includes: a controller (not shown in the figure), wherein:

[0128] The glue dispensing device 40 includes retractable glue dispensing needles 412 arranged in an array;

[0129] The controller is used to adjust the retractable glue dispensing needles 412 arranged in an array according to the glue dispensing holes 211 distributed on the clamping component 21 or the layout of the battery cell.

[0130] Technical solution 11: The battery string welding system according to technical solution 10 further includes: a photographing device (not shown in the figure) installed on the dispensing device 40, wherein:

[0131] The photographing device is used to photograph the main surface of the clamping member 21;

[0132] The controller analyzes the image captured by the camera to determine the distribution of the glue dispensing holes 211 on the clamping component 21 .

[0133] Technical solution 12: The battery string welding system according to technical solution 4,

[0134] The heating device 30 cools down the temperature in a gradient manner, and keeps the temperature at each gradient temperature for 5 to 10 seconds before continuing to cool down the temperature.

[0135] Technical solution 13: A battery string welding method implemented by using the battery string welding system described in any one of technical solutions 1 to 12, comprising:

[0136] Step 1, placing two clamping components 21 side by side in two adjacent grooves 11 of the conveying part 10;

[0137] Step 2: Laying a welding tape on one of the clamping components 21, and laying a battery cell on the welding tape;

[0138] Repeat steps 3 and 4 until the battery string is laid:

[0139] Step 3: Laying a welding strip on the last battery cell of the battery string and the next clamping component 21 adjacent to the last battery cell;

[0140] Step 4: Place the next battery cell located above the next clamping component 21 and the clamping component 21 located above the current last battery cell at the same time.

[0141] Technical solution 14: The battery string welding method implemented by the battery string welding system according to technical solution 13 further comprises:

[0142] Step 5: The arranged battery string is transported to a position corresponding to the heating device 30 by the conveying unit, and the heating device 30 heats the battery string so that the welding ribbon of the battery string is welded to the battery cell;

[0143] Step 6: The welded battery string is transported to a position corresponding to the glue dispensing device 40 by the conveying unit, and glue is dispensed on the soldering ribbon and the battery cell by the glue dispensing device 40 .

[0144] Technical Solution 15: The battery string welding method implemented by the battery string welding system according to Technical Solution 14 further comprises:

[0145] Step 7: The battery string after the dispensing is transported to the corresponding curing device 50 through the conveying unit, and the glue points formed by the dispensing are cured by the curing device 50.

[0146] Technical solution 16. The battery string welding method implemented by the battery string welding system according to technical solution 14, step 5 comprises:

[0147] The heating device 30 performs a gradient cooling process, wherein each gradient temperature is maintained for 5 to 10 seconds before continuing to cool.

[0148] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the utility model. For ordinary technicians in this technical field, the utility model can also be improved and modified without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A battery string welding system, characterized in that: include: Two conveying parts (10) and a detachable clamping device (20) are arranged opposite to each other, wherein: Each of the conveying parts (10) is provided with a plurality of grooves (11); The grooves (11) provided on the two conveying parts (10) correspond to each other one by one; The detachable clamping device (20) comprises a plurality of clamping components (21) and mounting portions (22) arranged at both ends of each of the clamping components (21); The mounting portion (22) matches the groove (11); The mounting portions (22) of the two clamping components (21) are stacked and clamped on the two corresponding grooves (11) on the two conveying portions (10) to form a clamping group; The clamping group is used to clamp and position the battery sheet and the welding strip.

2. The battery string welding system according to claim 1, characterized in that: The groove (11) is provided with a first magnetic attraction component; The mounting portion (22) includes a second magnetic attraction component; The second magnetic attraction components included in the mounting parts (22) of the two clamping components (21) in the clamping group attract each other; The second magnetic attraction component included in the mounting portion (22) of one of the clamping components (21) in the clamping group and the first magnetic attraction component arranged in the groove (11) attract each other.

3. The battery string welding system according to claim 1 or 2, characterized in that: The two clamping components (21) in the clamping group enclose a cavity for accommodating the battery sheet and the welding strip; The two clamping components (21) in the clamping group are respectively in contact with the welding strips on both sides of the battery cell.

4. The battery string welding system according to claim 1, characterized in that: Also includes: A heating device (30) and a glue dispensing device (40), wherein: The heating device (30) and the glue dispensing device (40) are arranged in sequence along the transmission direction of the conveying part (10); The heating device (30) is used to heat the welding strip and fix it on the battery cell; The glue dispensing device (40) is used to dispense fixing glue on the welding strip fixed on the battery cell, so as to reinforce the welding strip on the battery cell.

5. The battery string welding system according to claim 4, characterized in that: The clamping component (21) comprises distributed dispensing through holes (211), wherein: The glue dispensing through hole (211) corresponds to a glue dispensing position on the battery sheet; The glue dispensing device (40) dispenses fixed glue through the glue dispensing through hole (211).

6. The battery string welding system according to claim 4, characterized in that: The heating device (30) comprises: an upper heating part (31) and a lower heating part (32), wherein: The upper heating part (31) corresponds to the lower heating part (32); The upper heating portion (31) is located above the clamping group; The lower heating portion (32) is located below the clamping group; and / or, The glue dispensing device (40) comprises: an upper glue dispensing part (41) and a lower glue dispensing part (42), wherein: The upper glue dispensing portion (41) corresponds to the lower glue dispensing portion (42); The upper glue dispensing portion (41) is located above the clamping group; The lower glue dispensing portion (42) is located below the clamping group.

7. The battery string welding system according to any one of claims 4 to 6, characterized in that: Also includes: A curing device (50) is arranged behind the glue dispensing device (40) in the transmission direction of the conveying part (10), wherein: The curing device (50) is used to cure the fixing glue.

8. The battery string welding system according to claim 7, characterized in that: The curing device (50) comprises: an upper curing light box (51) and a lower curing light box (52), wherein: The upper curing light box (51) corresponds to the lower curing light box (52); The upper curing light box (51) is located above the clamping group; The lower curing light box (52) is located below the clamping group.

9. The battery string welding system according to claim 5, characterized in that: Also includes: controller, where The glue dispensing device (40) comprises retractable glue dispensing needles (412) arranged in an array; The controller is used to adjust the retractable glue dispensing needles (412) arranged in an array according to the glue dispensing through holes (211) distributed on the clamping component (21) or the format of the battery cell.

10. The battery string welding system according to claim 9, characterized in that: Also includes: A photographing device installed on the dispensing device (40), wherein: The photographing device is used to photograph the main surface of the clamping component (21); The controller analyzes the image captured by the camera to determine the distribution of the glue dispensing through holes (211) on the clamping component (21).

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