JP4378340B2 - Connection method of solar cell elements - Google Patents

Description

The present invention relates to a method for connecting solar cell elements connected by soldering a tab lead wire disposed on an electrode of the solar cell element, and more specifically, a preheating chamber for supplying hot air for preheating, a condensing heater, , integral Rutotomoni, hybrid condensing heater without moving, the tab lead wire and the solar cell element with hybrid condensing heater having integrally in contact with a cooling chamber for supplying warm air for cooling The present invention relates to a method for connecting solar cell elements, in which the tab lead wire is soldered continuously or intermittently while being moved, thereby preventing damage or warpage of the solar cell element due to thermal stress.

  Solar cells are power generation systems that directly convert sunlight, which is inexhaustible and free from environmental pollution, into electrical energy, and are rapidly expanding its range of use from residential use to life fields such as calculators, watches, and toys. is there.

  Such a solar cell includes a step of electrically connecting a plurality of solar cell elements by tab lead wires after a solar cell element manufacturing process, and forming the module between a transparent cover material and a protective material. It is manufactured through a process of laminating and sandwiching. In addition, among various types of solar cells, particularly amorphous silicon solar cells and crystalline silicon solar cells can be manufactured in a large area and are inexpensive to manufacture, In recent years, development of production technology for modularization and systemization has been further promoted, and from a small power generator of about 3 KW to a large power generator of several hundred KW has been put into practical use.

  On the other hand, under such a background, coupled with an increase in market demand, there is a demand for a significant cost reduction from the market. As one means, the thickness of the element substrate constituting the solar cell is 300 to 500 so far. The target is about 200 microns, which is thinner than micron, and in the near future, there is a possibility that the target will be extremely thinner than 100 microns.

  A solar cell module forming such a power generation device is formed by connecting a plurality of solar cell elements in series and in parallel, and a general connection method by soldering for connecting the elements is adjacent to each other. A solder-adhered tab lead wire is brought into close contact with one of the pre-soldered surface-side current collecting electrode and the other pre-solder-treated back side electrode, and then the tab lead wire is heated (welded) and cooled. However, since heating and cooling in this case are performed all at once over the entire length of the welded portion of the tab lead wire, as the temperature decreases to room temperature after welding, the element substrate and the tab lead wire are mainly connected. Due to the difference in thermal expansion coefficient, thermal stress (stress) is applied to the substrate side, and the element substrate may be cracked or warped, thereby reducing the yield rate. In addition, this tendency is more prominent as the substrate is thinner. Therefore, it is required to solve these problems in order to make the solar cell element extremely thin.

  In order to meet the above requirements, infrared lamps, near-infrared lamps, heated gas, or heated irons have been generally used as a heat source for heating when soldering the element substrate and the tab lead wire. A light condensing spot heater that uses infrared lamps and near-infrared lamps as a heating source and is particularly excellent in temperature controllability and rise / fall characteristics. Solder for printed circuit boards and semiconductor parts used in electrical equipment. It is used for the heat source apparatus for attaching (for example, refer patent document 1).

  Further, in a solar cell module in which a plurality of solar cell elements disposed between a translucent surface member and a back surface member and electrically connected to each other by connection tabs (tab lead wires) are sealed. The connection tab includes a plurality of connection portions that form a connection surface with the solar cell element and are separated from each other, and a connection portion that is separated from the connection surface with the solar cell element and connects the plurality of connection portions to each other. A solar cell module has been proposed (see, for example, Patent Document 2).

Furthermore, a plurality of solar cell elements having a back electrode on the back surface and a surface electrode and a collecting electrode on the front surface are arranged in parallel, and one solar cell element and another adjacent solar cell element are connected in series. In a solar cell module having a strip-shaped connection tab that is provided and connects a collecting electrode of one solar cell element and a back electrode of another solar cell element adjacent thereto, the connection tab can be soldered A solar cell module has been proposed in which a plurality of possible regions and non-solderable regions where soldering is impossible are provided alternately in the longitudinal direction (see, for example, Patent Document 3).
Japanese Patent No. 3461375 Japanese Patent Laid-Open No. 11-312820 Japanese Patent Laid-Open No. 2002-280591

  However, the spot heater in the technique described in Patent Document 1 efficiently dissolves the solder during soldering, but conversely, due to its excellent rise characteristics, the thin element substrate is rapidly heated, There is a problem that damage and warpage of the element substrate are unavoidable due to the thermal stress generated at that time, and when the rise characteristics are adjusted loosely to prevent this, the tact time of the soldering process is reduced. There is a problem that the productivity decreases as the length increases.

  Moreover, the connection tab in the technique described in Patent Document 2 is separated from each other and has a plurality of connection portions having a flat surface for forming a connection surface with the solar cell element, and these connection portions are connected to the solar cell element. This is caused by a difference in the thermal expansion coefficient between the connection tab and the substrate of the solar cell element by reducing the area of the connection surface. Although it is a technique for avoiding damage to the element, the heating and cooling of the connection tab are simultaneously heated over the entire length of the connection tab, and are also simultaneously cooled over the entire length of the connection tab. The occurrence of breakage and warpage is unavoidable, and it is damaged by handling and pressurization in each process of panel formation, resulting in a decrease in yield.

  In addition, the connection tab is not a mere flat tab lead wire covered with solder, as is commercially available, but a special structure in which a plurality of connecting portions sandwiched between the connecting portions are bent. Therefore, it is necessary to form it with high accuracy so as not to be disconnected from the bending portion or to maintain the strength of this portion, and the cost is inevitably increased.

  Further, the technique described in Patent Document 3 is an improvement of the technique described in Patent Document 2, and can be soldered in place of the connection tab having the connection part and the connection part in Patent Document 1 so that soldering is possible. Apply connection tabs that have multiple areas and non-solderable areas that cannot be soldered in the longitudinal direction, thereby preventing the generation of thermal stress on the board and preventing damage to the board It is what.

  That is, the connection tab of the invention described in Patent Document 3 masks a place where the solder adheres to the thin copper foil serving as a base partially at a plurality of locations, and then the heat-resistant resin or the like to which the solder does not adhere. After surface treatment with chrome plating, etc., masking is removed and pre-soldering is performed, so that the connection surface is only where the pre-solder is applied, thereby reducing the connection area easily. Since there is no mechanical processing, there is no part where the mechanical strength decreases, and by connecting the connection tab to the solar cell element intermittently, the thermal stress of the substrate that occurs during soldering can be reduced. This can reduce the substrate damage.

  However, even in the technique described in Patent Document 3, since the heating and cooling of the connection tab are performed simultaneously over the entire length of the connection tab, the occurrence of cracks and warpage is inevitable, and the connection tab is created. However, a special connection tab that requires a lot of man-hours, such as masking or surface treatment, is unavoidable, resulting in an increase in cost.

In view of such circumstances, the present invention solves the above-mentioned problems of the prior art, and in particular, a preheating chamber for supplying hot air for preheating when soldering in the longitudinal direction of the tab lead wire , a condensing heater, Using a hybrid type condensing heater that is integrated with the cooling chamber that supplies hot air for cooling, it is placed on the tab lead wire welding start position, and the tab lead wire and solar cell element are integrated. The machine mechanism can be formed simply by adopting a moving method, and a flat rectangular solder tab lead that is an inexpensive standard product that is commercially available without using expensive special connection tabs as in the past. The wire can be used and unnecessary thermal stress is prevented from occurring in the solar cell element to prevent cracking and warping of the element, thereby improving the yield of the solar cell element So, and to provide a method of connecting can provide a solar cell element an inexpensive solar cell element panel.

In order to achieve the above object, claim 1 of the present invention provides a tab lead wire when connecting a solar cell element having a surface electrode and a collecting electrode on the front surface and a back electrode on the back surface by soldering the tab lead wire. Hybrid type with a preheating chamber that supplies hot air for preheating, a condensing heater, and a cooling chamber that supplies hot air for cooling in contact with each other in the moving direction of the solar cell and the solar cell element A condenser heater is installed above the upper tab lead wire disposed on the current collecting electrode and / or below the lower tab lead wire disposed below the back electrode, and the tab lead wire and the solar cell element are moved together. Then, after the solder of the tab lead wire is locally melted, it is cooled and solidified quickly and continuously or intermittently over the entire length of the tab lead wire. It allows the thermal stress suppressing or relieving occurring in the solar cell element, and the content of the connection method of the solar cell element, characterized in that to prevent cracking and warping of the element.

According to a second aspect of the present invention, there is provided a solar cell element connection method according to the first aspect, wherein the condensing heater is a spot heater or a line heater.

According to a third aspect of the present invention, a preheating chamber for supplying hot air for preheating and a cooling chamber for supplying hot air for cooling are formed on the outer periphery of the casing of the heater, and the preheating chamber and the cooling chamber are provided. 3. The method for connecting solar cell elements according to claim 2 , wherein the solar cell element connection method is divided into two by a dividing wall.

The solar cell element connection method according to the present invention comprises a hot air for preheating when connecting a solar cell element having a surface electrode and a collecting electrode on the front surface and soldering a tab lead wire to the solar cell element having a back electrode on the back surface. Of the upper tab lead wire disposed on the surface electrode is a hybrid type condensing heater integrally provided so as to be in contact with the preheating chamber for supplying heat, the condensing heater, and the cooling chamber for supplying hot air for cooling . Installed above and / or below the lower tab lead wire disposed below the back electrode, and the tab lead wire and the solar cell element are moved together to connect the tab lead wire while locally melting and cooling the solder. As a result, the thermal stress generated in the solar cell element is suppressed or alleviated, and therefore, cracking and warping of the element are prevented, and the yield of the solar cell element is improved. In addition to providing an inexpensive solar cell element panel, it is possible to correspond to the cell element raw material semiconductor lack of tension.

  The reason why such an effect is achieved by the present invention is that the solder is locally heated and melted instead of simultaneously heating and cooling the entire length of the lead wire as in the prior art, or preheating. After heating and melting, the operation of promptly cooling and welding is repeated continuously or intermittently. As a result, the lead wire that has once expanded by heating is immediately cooled, and then it starts to contract and expands and contracts locally. Since the balance is maintained and this is repeated over the entire length of the lead wire, the tab lead wire and the solar cell element are not overheated, and even if the tab lead wire is cooled to room temperature, the thermal stress is suppressed or alleviated, It is thought that cracking and warping are reduced.

  In addition, since the tab lead wire used in the present invention can be a flat standard soldered tab lead wire which is a commercially available inexpensive standard product, it is possible to realize a significant cost reduction.

The solar cell element connection method of the present invention includes a tab lead wire and a solar cell element when connecting a solar cell element having a surface electrode and a collecting electrode on the front surface and a back electrode on the back surface by soldering the tab lead wire. A hybrid type condensing heater provided integrally with a preheating chamber for supplying hot air for preheating, a condensing heater, and a cooling chamber for supplying hot air for cooling in the moving direction of The tab lead is installed above the upper tab lead wire disposed on the current collecting electrode and / or below the lower tab lead wire disposed below the back electrode, and the tab lead wire and the solar cell element are moved integrally. After the wire solder is locally melted, it is quickly and locally solidified by continuously or intermittently connecting over the entire length of the tab lead wire. The thermal stress suppressing or relieving occurring in the solar cell element, characterized in that to prevent cracking and warping of the element.

In the solar cell element connection method of the present invention, a hybrid condensing heater may be provided only above or below the solar cell element to connect the front and back surfaces of the solar cell element separately. A hybrid type condensing heater is installed above and below the element, and the tab lead wire and the solar cell element are moved together to melt and cool the solder of the tab lead wires on the front and back surfaces of the solar cell element at the same time. It is also possible to connect continuously or intermittently simultaneously.

In the present invention , the inventor proposed in Japanese Patent Application No. 2005-246473 (filed on Aug. 26, 2005), supplying a preheating chamber for supplying hot air for preheating to the condensing heater, and supplying hot air for cooling. A hybrid condenser heater having a cooling chamber is used. Preheating chambers and cooling chambers are provided integrally with the condenser heater proximate respectively. The preheating chamber is supplied with hot air having a solder melting temperature of minus 10 ° C. to about 250 ° C., and the cooling chamber is supplied with hot air having a solder melting temperature of minus 10 ° C. to about room temperature.

Such hybrid type condensing heaters include those having no focal hole and those having a focal hole. If necessary, a cooling jacket is provided and cooling means for circulating a coolant such as water is provided. be able to.
In addition, it is preferable to provide a pressing part of the workpiece for improving the heat conduction efficiency, the current collecting electrode of the tab lead wire, and the accuracy of adhesion to the back electrode near the heating part of the condenser heater. Examples include a roller or a warped plate-like body.

  First, a hybrid spot heater without a focal hole will be described with reference to FIGS. 1 (a) and 1 (b). The hybrid spot heater 17 has a three-dimensional curved surface with one open inside the housing 18. A condenser mirror 19 is provided, and a heat source lamp 20 such as a halogen lamp is attached to the center thereof. Then, the heat rays from the heat source lamp 20 are condensed by the condensing mirror 19 and irradiated to a workpiece placed close to the focal point F as high-energy spot light.

  Further, the outer periphery of the casing 18 is formed concentrically and is divided into two by a dividing wall 18K, and a preheating chamber 21 for supplying hot air for preheating and a cooling chamber 22 for supplying hot air for cooling are provided. A hot air connection port 23 connected to the end of the preheating chamber 21 by a hose from a hot air supply source (not shown) is connected to one end of the preheating chamber 21, and a hot air supply source (not shown) is connected to one end of the cooling chamber 22. ) Is provided with a hot air connection port 24 connected by a hose or the like. Further, on the upstream side of the preheating chamber 21 and the cooling chamber 22, a rectifying chamber 25 for controlling the flow direction of hot air and hot air flowing into the respective chambers is provided, and an inverted conical shape is formed below the rectifying chamber 25. The hot air outlet 26 and the hot air outlet 27 that are formed in the above and are blown out toward the workpiece are provided. A protective glass 28 is provided at the open end of the condenser mirror 19 to protect the condenser mirror 19 and the heat source lamp 20 from dust collection and the like.

Next, a hybrid spot heater having a focal hole will be described with reference to FIGS. 2 (a) and 2 (b). The description of the same components as those described above with reference to FIGS. 1A and 1B will be omitted, and the other components will be described.
As shown in the figure, the spot heater 17A with a hybrid focal hole is formed in an inverted conical shape from the lower part of the open end of the condenser mirror 19 provided inside the casing 18 of the spot heater 17 described above, and is formed at the center. In this embodiment, a conical wall 30 having a focal hole 29 is provided. The spot light emitted from the focal hole 29 contains almost no direct heat from the heat source lamp 20, and only the thermal energy condensed by the condenser mirror 19 is irradiated to the workpiece as spot light, so strict temperature heating control is performed. This is suitable when

What provided the pressing part which consists of a roller for pressing a workpiece or a warp-like plate-like body in the vicinity of the heating part of the heater mentioned above is preferable.
An example in which a roller is provided as a pressing portion on a spot heater with a hybrid focal hole will be described with reference to FIGS. 3 (a) and 3 (b) .The spot heater 17B with a pressing portion is configured such that the roller 34 is pivotally supported on a bearing base 33. The pressed portion 35 is attached to a mounting base 36 fixed to the preheating chamber 21 and the cooling chamber 22 by a fastening screw 37, respectively. The roller 34 in contact with the workpiece of the pressing portion 35 pressed against the workpiece is formed from heat-resistant glass or ceramic or metal material coated with titanium or solder resist, etc. Can be replaced with a new one by removing the fastening screw 37 from the mounting base 36 and separating it.

Next, the hybrid type condensing heater used in the present invention may be a hybrid type line heater in which the heating portion irradiated on the workpiece is not a spot shape but a linear heating. An example of a hybrid type condensing heater provided with a pressing portion made of a solid body will be described with reference to FIGS. 4 (a), (b) and (c).
As shown in the figure, the hybrid line heater 17C is provided with a condensing mirror 19A having a two-dimensional curved surface inside a casing 18A formed in a rectangular parallelepiped shape, and a straight tube heat source at the center thereof. The lamp 20A is mounted in parallel with the traveling direction (left-right direction in the figure). In addition, a preheating chamber 21A and a cooling chamber 22A having a hot air outlet 26A and a hot air outlet 27A are provided on both sides of the casing 18A, and outside the preheating chamber 21A and the cooling chamber 22A, respectively. Each of the mounting bases 36A is fixed. Then, a pressing portion 35A in which a warped plate-like body 34A is pivotally supported on the bearing base 33A is fixed to the mounting base 36A by a fastening screw (not shown).

  Note that the pressing portion 35A on which the slanted plate-like body 34A shown in FIG. 4 (a) is pivotally supported is compatible with the pressing portion 35 of the roller 34 type shown in FIG. You can select the best one. For example, it is also possible to attach the pressing portion 35 of the roller 34 type shown in FIG. 4 (c) by removing the warped plate-like body 34A shown in FIG. 4 (a).

The hybrid type condensing heater equipped with the pressing part is firmly fixed by the pressing part 35 and the part that receives preheating, heating, and cooling of the work piece is firmly fixed, so that there is no extra distortion and thermal efficiency is increased. Good and accurate soldering is possible .

  As a means for integrally moving the tab lead wire and the solar cell element, which is a feature of the solar cell element connection method of the present invention, a pair of upper and lower double belts are used to keep the tab lead wire and the solar cell element in order to maintain the conveyance accuracy. It is preferable to sandwich and convey by.

The double belt may be a normal belt such as a timing belt in both the upper and lower sides, and the lower side of the double belt is described in, for example, a transfer device and transfer device of Japanese Patent No. 3362651, and a transfer mechanism (Toyamakikai Co., Ltd.). A vacuum belt having a suction function can be used, and a normal belt such as a timing belt can be used on the upper side.
Conveying the tab lead wire and the solar cell element, (strictly collector electrode and / or the back electrode) solar cell element the tab lead wires are speed that can be soldered to the other solder types, suitably by heating temperature and the like It is determined.

  As the solar cell element, for example, a surface electrode is formed on the surface of an element substrate having a dimension of about 125 mm square and a thickness of about 200 microns, a back electrode is formed on the back surface, and on the same surface side as the surface electrode. In general, two rows of current collecting electrodes that are connected to the surface electrode and collect current are formed. And in order to complete a solar cell module, a tab lead wire is soldered along the longitudinal direction of a current collection electrode to one adjacent current collection electrode of a solar cell element, and the other adjacent back electrode. About 10 to 10 solar cell elements are connected.

  Hereinafter, a preferred embodiment of a method for connecting solar cell elements and an apparatus for carrying out the connection method of the present invention will be described.

Embodiment 1
As shown in FIGS. 5 (a) and 5 (b), for example, the above-described spot heater 17B with a pressing portion is formed on the collecting electrode 3 of the surface electrode 2 formed in two strips on the solar cell element 5. Are arranged side by side, and at the bottom of the solar cell element 5 are tab lead wires 6 and 6 inside the current collecting electrode 3 formed in two strips and in parallel therewith. A motor (not shown) for moving the solar cell element 5 integrally is provided with a vacuum belt 43 as described above which is moved by a driving pulley 42. Further, a preheating zone X and a heating zone are provided below the tab lead wire. A lower heating device 9 with Y and cooling zone Z is provided.
With the above configuration, the tab lead wire 6 and the solar cell element 5 are connected continuously or intermittently while integrally moving in the direction indicated by the arrow A in FIG. 9B (from left to right in the figure). . In addition, when the tab lead wire 6 is soldered to the collector electrode 3 of the solar cell element 5 by the hybrid type condensing heater 41, the temperature difference between the upper and lower surfaces is reduced due to the heating and cooling effect from the lower heating device 9, so that the heat Stress is less likely to occur, and therefore, there is an effect that warping and cracking of the solar cell element 5 are eliminated. The lower heating device 9 is not essential, but it is preferable to provide the lower heating device 9 because the temperature can be finely controlled as described above. When the lower heating device 9 is not provided, the lead wire holding base 10 and the pressing rod 15 that are heated to a temperature equal to or lower than the solder melting temperature are usually provided.

Embodiment 2
As shown in FIGS. 6 (a) and 6 (b), for example, the above-described spot heater 17B with a pressing portion is disposed above the collecting electrode 3 of the surface electrode 2 formed in two strips on the top of the solar cell element 5. The hybrid type condensing heaters 41 as described above are provided side by side, and the hybrid condensing heater 41 of the same type is also provided under the back electrode at the bottom of the solar cell element 5 so as to face each other.
In addition, a vacuum belt 43, 43A moved by a pulley 42 driven by a motor (not shown) for integrally moving the tab lead wire 6 and the solar cell element 5 is provided upstream of the hybrid condensing heater 41A provided at the lower portion. A normal belt 44 such as a timing belt or a stainless steel belt is provided on the downstream side and the downstream side of the vacuum belt 43A.
Further, in this example, the lower heating device 9 as the preheating zone X is provided on both sides of the upstream side vacuum belt 43, but this is preferable because the temperature can be finely controlled as described above.
With the above configuration, the tab lead wire 6 and the solar cell element 5 can move integrally in the direction indicated by the arrow B in FIG. 6 (b) (from left to right in the figure). The tab lead wires are soldered continuously or intermittently by the four upper and lower hybrid condensing heaters 41 and 41A from the front end of the element in the traveling direction.

Embodiment 3
Another embodiment in which heaters for soldering are provided on both upper and lower surfaces of the solar cell element will be described with reference to FIGS. 7 (a) and 7 (b). FIG. 7 (a) is a front view showing an outline of the overall configuration, and FIG. 7 (b) is a partial side view thereof.
As shown in FIGS. 7 (a) and 7 (b), the preheating nozzle 45, the heating nozzle 46, and the warming air for cooling are disposed on the collector electrodes 3 provided in two rows above the solar cell element 5. Two rows of upper welding heads 48 composed of nozzles 47 are provided, and two hybrid condenser heaters 41 are provided below the lower back electrode 4 so as to face the heating nozzle 46. In addition, a vacuum belt 43 that is moved by a pulley 42 that drives a motor (not shown) for transferring the tab lead wire 6 and the solar cell element 5 includes two hybrid condensing heaters 41 on both sides. Is provided. Further, as shown, a lower heating device 9 as a preheating zone X is provided as necessary.
With the above configuration, the tab lead wire 6 and the solar cell element 5 are integrally moved in the direction indicated by the arrow B in FIG. 11 (a) (from the left to the right in the figure) and disposed at the upper and lower portions. From the upper welding head 48 and the hybrid type condensing heater 41, and further by the controlled control heat from the preheating zone X of the lower heating device 9, a tab lead wire is formed from the front end portion in the traveling direction of the solar cell element as described above. Soldered continuously or intermittently.

As described above, according to the solar cell element connection method of the present invention, the hybrid type condensing heater integrally provided so as to contact the preheating chamber, the condensing heater, and the cooling chamber is fixed at a substantially fixed position. By installing and moving the tab lead wire and the solar cell element integrally, the complicated two-dimensional operation and control of the hybrid condensing heater can be avoided, so that the apparatus can be realized at low cost. Furthermore, contact with connection speed is increased, it is possible to make the apparatus more compact. In addition, even when the number of tab lead wires required for next-generation large-sized solar cell elements (200 mm square and 250 mm square) is increased to 3 to 4, mechanical interference can be avoided, so that the apparatus can sufficiently respond to such a request. Can be provided.

In addition, by using the solar cell element connection method of the present invention, cracking of the solar cell element due to thermal stress when soldering the tab lead wire and warpage of the element connected by the tab lead wire are greatly reduced. Product yields can be greatly improved, panels can be provided at low cost, and it is possible to cope with the tight shortage of raw material semiconductors for cell devices.
As described above, the method for connecting solar cell elements of the present invention is particularly useful for connecting an extremely thin solar cell element that is likely to be warped or cracked due to thermal stress.

(A) is a partial cross-sectional front view of a spot type hybrid condenser heater, and (b) is a bottom view of the heater. (A) is a partial cross-sectional front view of another spot type hybrid condenser heater, and (b) is a bottom view of the heater. (A) is a front view of another spot type hybrid condenser heater, and (b) is a side view of the heater. (A) is a front view of another line type hybrid condensing heater, (b) is a sectional view showing a condensing mirror built in the heater, (c) is a pressing portion of the heater of FIG. It is a front view which shows the other pressing part which can be replaced | exchanged. (A) is a schematic plan view explaining the connection method and apparatus of the solar cell element in Embodiment 1 of this invention, (b) is a schematic side view explaining the connection method. (A) is an outline top view explaining the connection method and apparatus of a solar cell element in Embodiment 2 of the present invention, and (b) is an outline side view explaining the connection method. (A) is a general | schematic side view explaining the connection method of the solar cell element in Embodiment 3 of this invention, (b) is a general | schematic partial side view explaining the connection method.

1 Element substrate
2 Surface electrode
3 Current collecting electrode
4 Back electrode
5 Solar cell element
6 Tab lead wire
17 Hybrid spot heater (no focal hole)
17A hybrid spot heater (with focal hole)
17B Spot heater with hybrid type pressing part
17C hybrid line heater
18, 18A housing
18K dividing wall
19, 19A condenser mirror
20, 20A heat source lamp
21, 21A Preheating chamber
22, 22A Cooling chamber
23 Hot air connection port
24 Hot air connection port
25 Rectification room
26, 26A Hot air outlet
27, 27A Hot air outlet
28 Protective glass
29 Focal hole
30 conical wall
31 preheating NeppuIri opening
33 , 33A Bearing stand
34 Roller
34A Sled plate
35, 35A pressing part
36, 36A Mounting base
37 Fastening screw
38 Tab lead wire holding mechanism
39 Finger part
40 Positioning retainer
41 Hybrid type condensing heater
42 pulley
43 Vacuum belt
44 Normal belt
45 Preheating nozzle
46 Heating nozzle
47 Cooling hot air nozzle
48 Upper welding head
X Preheating zone
Y heating zone
Z cooling zone

Claims (3)

When connecting a solar cell element having a surface electrode and a collecting electrode on the front surface and a back electrode on the back surface by soldering the tab lead wire, hot air for preheating is applied in the moving direction of the tab lead wire and the solar cell element. An upper tab lead wire disposed on the current collecting electrode, a hybrid type condensing heater integrally provided so as to contact a preheating chamber to be supplied, a condensing heater, and a cooling chamber for supplying hot air for cooling And / or below the lower tab lead wire disposed under the back electrode, and while the tab lead wire and the solar cell element are moved integrally, the tab lead wire solder is locally melted, By quickly and locally solidifying and solidifying the tab lead wire continuously or intermittently over the entire length, the thermal stress generated in the solar cell element is reduced. Control or mitigate, the connection method of the solar cell element, characterized in that to prevent cracking and warping of the element. Connection method of the solar battery cell of claim 1, wherein the condensing heater is characterized in that it consists of spot heater or line heater. A preheating chamber that supplies hot air for preheating and a cooling chamber that supplies hot air for cooling are formed on the outer periphery of the heater casing, and the preheating chamber and the cooling chamber are divided into two by a dividing wall. The method for connecting solar cell elements according to claim 2 .

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