A welding device and method for a solar cell

Abstract

The present invention discloses a welding device for solar cell wafers, comprising a pressing member with a guiding groove and a heating and welding unit; the pressing member can perform relative translation with respect to the cell wafer; during the relative translation process, the guiding groove can float up and down, and the guiding groove always presses on the strip-shaped welding material on the surface of the cell wafer, and guides the laying direction of the strip-shaped welding material; the heating and welding unit can directly heat and / or indirectly heat the strip-shaped welding material, so that the strip-shaped welding material is heated and the welding with the cell wafer is completed. The present invention also provides a welding method for solar cell wafers, which uses the above-mentioned welding device to weld the strip-shaped welding material on the surface of the cell wafer. The present invention can improve the welding precision of the metal welding wires on the surface of the cell wafer; can solve the problem of great difficulty in small-area contact welding, enabling the realization of the ultra-fine and super-abundant welding wire welding process; can solve the problem that the special-shaped welding wires cannot be welded; can solve the problem that a large number of welding wires on the surface of the cell wafer cannot be welded.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaics, and particularly to a welding device and method for solar cells. Background Art

[0002] For the method of connecting solar photovoltaic module cells in series, generally, tinned copper tapes or tinned copper wires are respectively welded to the front and back silver electrodes of the cells. The number of solder tapes or wires welded on a single side of a single cell generally ranges from 2 to more than 20. When the number is small, solder tapes with a flat cross-section are generally used, and when the number is large, solder wires with a circular cross-section are generally used. The more solder wires on the cell surface, the smaller and thinner the cross-sectional area of a single solder wire is required. For example, when the number of solder wires is 9, the wire diameter of the solder wire is generally 0.32 - 0.35 mm; when the number of solder wires is more than 15, the wire diameter of the solder wire is generally 0.25 - 0.3 mm. The welding method generally uses jaws to simultaneously clamp both ends of multiple solder wires and slightly stretch and extend the solder wires to make them straight, then transfer the solder wires to the cell surface and place them on the surface electrodes, and then vertically place multiple wire pressing elements or blocks on the solder wires to make the solder wires closely adhere to the cell surface electrodes. Then, the cell and the solder wires are heated by an infrared heating tube above to weld the solder wires to the cell electrodes together.

[0003] The main defects of the above conventional welding methods are as follows: ① Low welding accuracy. The welding tape or welding wire is transported and rotated to align with the electrode of the cell, and then local point gravity pressing is applied. The overall mechanical control process, the circular structure of the welding wire, and the characteristic that the welding wire is prone to expand and bend when heated will inevitably cause the welding wire to be easily displaced. In actual welding, the welding wire deviates seriously from the center of the electrode. Generally, in actual production, pads with a size slightly larger than the wire diameter of the welding wire are set on the electrode, and it is required that the welding wire does not deviate from the pad after welding. However, in this case, the welding quality of the cell and the performance of the module will decline. ② The welding design area cannot be too small. Because of the low welding accuracy, if the designed welding area is too small, the welding wire will deviate from the welding area and no welding can be formed. In addition, except for the several points where pressure is applied on the welding wire, there is almost no good fit between the rest of the welding wire and the electrode of the cell, and in many places there is no contact at all, only the distance between the two is very small. After the cell and the welding wire are heated, the tin on the welding wire begins to melt and flows downward to touch the electrode of the cell. The place where the molten tin touches the electrode can form a welding bond, and the place where it does not touch cannot form a welding bond. If the electrode area is too small and the welding tape is displaced, it is very difficult to form a good contact surface and a good welding effect cannot be achieved. Therefore, in actual production, only the welding effect at the pads with a larger area is good, and almost no welding is formed or the welding effect is very poor at the extremely thin electrode grid lines between the pads, and the welding quality in this area is generally not required. ③ It is impossible to weld special-shaped welding tapes. With the development of photovoltaic module technology, the use of special-shaped welding tapes will be more and more, and the wire diameter will be thinner and thinner. Especially for the triangular structure welding wire with low light shielding of the cell, its structure determines that the welding needs to consider the directionality of the welding wire itself. The conventional welding wire fixing process basically does not consider such problems, so it is also impossible to realize the welding of special-shaped structure welding wires. Summary of the Invention

[0004] To solve the defects of the prior art, the present invention provides a welding device for solar cells, including:

[0005] A pressing member provided with a guiding groove, the pressing member can produce relative translation with the cell that needs to weld a strip-shaped welding material. The guiding groove on the pressing member faces the cell, and the guiding groove can allow the corresponding strip-shaped welding material to pass through. During the relative translation process, the guiding groove presses on the corresponding strip-shaped welding material on the surface of the cell, and the guiding groove guides the laying direction of the corresponding strip-shaped welding material (that is, guides the extending direction of the strip-shaped welding material on the surface of the cell), so that the strip-shaped welding material extends in a predetermined laying direction; and during the relative translation process, the pressing member (guiding groove) can float up and down relative to the surface of the cell, so that the guiding groove always presses on the corresponding strip-shaped welding material on the surface of the cell, compatible with the height fluctuations of the surface of the cell and the strip-shaped welding material during the translation process, and ensuring the real-time fit between the guiding groove and the strip-shaped welding material;

[0006] A heating and welding unit, which can directly heat and / or indirectly heat the strip-shaped welding material at the alignment groove (and can also include the area near the alignment groove) during relative translation, so that the strip-shaped welding material is heated and welded to the solar cell.

[0007] For the specific content of the welding device of the solar cell of the present invention, please refer to the embodiments.

[0008] The present invention also provides a welding method for solar cells. Using the above welding device, a strip-shaped welding material is welded on the surface of the solar cell; during welding, the pressing member and the solar cell are relatively translated (the direction of relative translation is the predetermined laying direction of the strip-shaped welding material); and during the relative translation process:

[0009] The alignment groove on the pressing member presses on the corresponding strip-shaped welding material on the surface of the solar cell, and the alignment groove guides the laying direction of the corresponding strip-shaped welding material (that is, guides the extending direction of the strip-shaped welding material on the surface of the solar cell), so that the strip-shaped welding material extends in the predetermined laying direction;

[0010] And the heating and welding unit directly heats and / or indirectly heats the strip-shaped welding material at each alignment groove (and can also include the area near each alignment groove), so that the strip-shaped welding material is heated and welded to the solar cell.

[0011] The advantages and beneficial effects of the present invention are as follows: providing a welding device and method for solar cells, which can improve the welding accuracy of metal welding wires on the surface of solar cells; can solve the problem of difficult small-area contact welding, enabling the realization of the ultra-fine and super-many welding wire process; can solve the problem of unable to weld special-shaped welding wires; can solve the problem of unable to weld due to too many welding wires on the surface of solar cells.

[0012] The present invention has the following characteristics:

[0013] 1) The present invention independently positions each strip-shaped welding material (welding wire or welding tape) through the pressing member and applies a certain pressure to the strip-shaped welding material, so that it can always be completely attached to the electrode of the solar cell during the traveling process;

[0014] 2) The pressing member of the present invention can be in the form of a spring piece, a swing rod, a roller, etc., as long as it can apply pressure to the strip-shaped welding material (welding wire or welding tape) and can float up and down to accommodate slight height fluctuations;

[0015] 3) The present invention can heat the contact point and the nearby area between the strip-shaped welding material (welding wire or welding tape) and the electrode, so that the solder melts, and when the strip-shaped welding material (welding wire or welding tape) slides out of the pressing member, it can form a weld with the electrode. The heating and welding unit can be integrated with the pressing member or set separately;

[0016] 4) The heating method of the heating and welding unit of the present invention can be heating forms such as hot air, infrared, electromagnetic, inductance, resistance wire conduction, and passing current, as long as it can heat the welding tape to the tin melting temperature;

[0017] 5) The depth of the guiding groove of the present invention is slightly smaller than the thickness / height of the strip-shaped welding material (welding wire or welding tape). A part of the strip-shaped welding material is pressed in the groove and a part is exposed for easy contact with the battery electrode;

[0018] 6) The position and direction of the strip-shaped welding material (welding wire or welding tape) of the present invention are completely determined by the pressing member / guiding groove, which can ensure the position accuracy and direction of the strip-shaped welding material. And the strip-shaped welding material is always in contact with the battery cell and a certain pressure is applied, which can ensure the welding effect of each point on the strip-shaped welding material;

[0019] 7) Multiple strip-shaped welding materials (welding wires or welding tapes) are welded simultaneously. Each strip-shaped welding material corresponds to an independent guiding groove, and each guiding groove can float up and down independently without interference, which can well accommodate the up and down errors during the welding of each strip-shaped welding material; This is very crucial because during the welding process, the battery cell and the pressing member / guiding groove cannot be absolutely parallel, and the surface of the battery cell electrode is uneven, and the electrodes and the guiding grooves are not absolutely at the same height. It is necessary to require the pressing member / guiding groove to float up and down within a certain range at any time during the welding to ensure that each strip-shaped welding material is pressed by the guiding groove at any time and ensure full contact between the strip-shaped welding material wire and the electrode.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1) By providing a pressing member with a guiding groove, the present invention can real-time guide the strip-shaped welding material (welding wire or welding tape), so that the strip-shaped welding material always maintains in the predetermined layout direction (electrode grid line), and welding is completed immediately after guiding, greatly improving the welding accuracy.

[0022] 2) The present invention can achieve high-precision control. The strip-shaped welding material (welding wire or welding tape) is not easy to deviate from the electrode grid line, making small-area welding possible and enabling welding of extremely thin and numerous welding wires.

[0023] 3) While guiding, the pressing member of the present invention corrects the layout direction of the strip-shaped welding material (welding wire or welding tape), enabling welding of special-shaped structure welding wires such as triangles.

[0024] 4) The present invention has an independent guiding and non-interfering design for multiple strip-shaped welding materials (welding wires or welding tapes), which can make each strip-shaped welding material (welding wire or welding tape) be stressed and guided separately. Therefore, simultaneous welding of a large number of strip-shaped welding materials (welding wires or welding tapes) can be achieved, and the minimum distance between the welding wires can be less than 1 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figures 1 to 4 is a schematic diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The following further describes the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0027] The present invention provides a welding device for solar cell wafers, including:

[0028] A pressing member provided with a guiding groove, which can translate relative to the solar cell wafer to be welded with a strip-shaped welding material. The guiding groove on the pressing member faces the solar cell wafer, and the guiding groove allows the corresponding strip-shaped welding material to pass through. The cross-sectional shape of the guiding groove matches the cross-sectional shape of the corresponding strip-shaped welding material, and the depth of the guiding groove is not greater than the thickness of the corresponding strip-shaped welding material; during the relative translation process, the guiding groove presses on the corresponding strip-shaped welding material on the surface of the solar cell wafer, and the guiding groove guides the laying direction of the corresponding strip-shaped welding material (that is, guides the extending direction of the strip-shaped welding material on the surface of the solar cell wafer), so that the strip-shaped welding material extends in a predetermined laying direction; and during the relative translation process, the pressing member can float up and down relative to the surface of the solar cell wafer, so that the guiding groove always presses on the corresponding strip-shaped welding material on the surface of the solar cell wafer;

[0029] A heating and welding unit, which can directly heat and / or indirectly heat the strip-shaped welding material at the guiding groove (and can also include the area near the guiding groove) during the relative translation process, so that the strip-shaped welding material is heated and welded to the solar cell wafer; the heating and welding unit adopts one or several of the heating methods of hot air heating, infrared heating, electromagnetic induction heating, conduction heating, and current heating;

[0030] A translation driving unit, which makes the pressing member translate relative to the solar cell wafer, and the direction of the relative translation is the predetermined laying direction of the strip-shaped welding material, and the translation driving unit also makes the heating and welding unit translate synchronously with the pressing member.

[0031] Specifically, the strip-shaped welding material is a welding tape or a welding wire, and the cross-sectional shape of the strip-shaped welding material is circular, triangular or rectangular.

[0032] If multiple parallel strip-shaped welding materials need to be welded on the surface of the solar cell wafer, the specific solution of the pressing member includes:

[0033] 1) Solution 1:

[0034] The pressure member is provided with a plurality of guiding grooves, all of which face the battery cell, and are arranged side by side (the arrangement direction of the plurality of guiding grooves is perpendicular to the predetermined layout direction of the strip welding material), and the guiding grooves correspond to the strip welding material one by one, and the guiding grooves can allow the corresponding strip welding material to pass through, the cross-sectional shape of the guiding grooves matches the shape of the corresponding strip welding material, and the depth of the guiding grooves is not greater than the thickness of the corresponding strip welding material; during the relative translation process, the guiding grooves press on the corresponding strip welding material on the surface of the battery cell, and the guiding grooves correct the layout direction of the corresponding strip welding material (i.e., correct the extension direction of the corresponding strip welding material on the surface of the battery cell), so that the corresponding strip welding material extends in the predetermined layout direction;

[0035] The heating welding unit can directly and / or indirectly heat the strip welding materials at each guiding groove (and also the area near each guiding groove) at the same time (during the relative translation process), so that each strip welding material is heated and welded to the battery cell.

[0036] Specifically, in Plan 1:

[0037] The pressure piece provided with a plurality of guiding grooves is an elastic pressing plate; the elastic pressing plate includes a pressure end facing the battery cell, and a plurality of guiding grooves are provided on the pressure end of the elastic pressing plate. More specifically, the pressure end of the elastic pressing plate is divided into a plurality of pressure strips facing the battery cell, and each pressure strip is provided with one or more guiding grooves at the end facing the battery cell. During the relative translation process, the pressure strip can float up and down relative to the surface of the battery cell, so that the guiding grooves at the ends of the pressure strips are always pressed on the corresponding strip welding material on the surface of the battery cell. The elastic pressing plate is also provided with: a threading hole for guiding the strip welding material to lean against the guiding groove; during the relative translation process, the strip welding material first passes through the threading hole and then passes through the guiding groove. See for details. Figure 1 : Figure 1 In the invention, the strip welding material adopts a welding wire with a cross-section shape of an equilateral triangle (the side length of the triangle is 0.13mm), each welding wire is controlled by a pressure strip on the elastic pressing plate, the guide groove at the end of the pressure strip is a V-shaped groove, the top angle of the V-shaped groove is 60°, and the maximum depth of the V-shaped groove is 0.1mm; the welding wire is pulled into the guide groove at the end of the pressure strip through the threading hole on the elastic pressing plate; during the welding process, each pressure strip independently applies pressure to the corresponding welding wire, which can ensure that each welding wire is overlapped and compacted with the electrode grid line on the battery cell (the extension direction of the electrode grid line is the predetermined layout direction of the welding wire); the heating welding unit adopts a thermal wire, a heating wire or a heating rod, and the elastic pressing plate is heated as a whole by the thermal wire, the heating wire or the heating rod. When the welding wire passes through and contacts the elastic pressing plate, the welding wire is heated to the tin melting temperature, so that the solder on the welding wire melts, and when it slides out of the guide groove at the bottom of the elastic pressing plate, it is welded to the electrode grid line on the surface of the battery cell.

[0038] Alternatively, the pressing member provided with a plurality of alignment grooves is a pressing wheel; the side circumference of the pressing wheel faces the solar cell, and a plurality of alignment grooves are provided on the side circumference of the pressing wheel, and the alignment grooves are annular grooves coaxial with the pressing wheel. More specifically, the pressing wheel is a soft wheel. During the relative translation process, the pressing wheel (soft wheel) can float up and down relative to the surface of the solar cell, so that the alignment grooves on the side circumference of the pressing wheel are always pressed on the corresponding strip-shaped welding material on the surface of the solar cell. For details, see Figure 2 : Figure 2 In Figure 2 , the strip-shaped welding material uses a welding wire with an equilateral triangle cross-section (triangle side length 0.13 mm). The alignment grooves on the side circumference of the pressing wheel are V-shaped grooves. The depth of the V-shaped groove is 0.5 mm and the apex angle is 60°. Each welding wire is pressed by an alignment groove on the side circumference of the pressing wheel. The apex of the welding wire faces upward and is pressed by the pressing wheel on the electrode grid line of the solar cell. The side circumference / alignment groove of the pressing wheel is in flexible contact with the apex of the welding wire, and a downward pressure is applied to the welding wire from the apex, which can accommodate the height difference between different welding wires, and is also equivalent to the mutual independence between the welding wires, and can ensure full contact at each point between the welding wire and the electrode grid line (the extension direction of the electrode grid line is the predetermined laying direction of the welding wire); the heating and welding unit uses an infrared heating tube, and the infrared heating tube heats the welding wire at and near the pressing wheel, so that the solder on the welding wire melts and is welded to the electrode grid line.

[0039] 2) Solution two:

[0040] There are a plurality of the pressing members, and the plurality of pressing members correspond to the plurality of strip-shaped welding materials one by one. The plurality of pressing members can be translated synchronously. The alignment grooves on the plurality of pressing members all face the solar cell. The alignment grooves on the plurality of pressing members are arranged side by side (the arrangement direction of the alignment grooves is perpendicular to the predetermined laying direction of the strip-shaped welding materials), and the alignment grooves correspond to the strip-shaped welding materials one by one. The alignment grooves can allow the corresponding strip-shaped welding materials to pass through. The cross-sectional shape of the alignment grooves matches the shape of the corresponding strip-shaped welding materials, and the depth of the alignment grooves is not greater than the thickness of the corresponding strip-shaped welding materials; during the relative translation process, the alignment grooves are pressed on the corresponding strip-shaped welding materials on the surface of the solar cell, and the alignment grooves guide the laying direction of the corresponding strip-shaped welding materials (that is, guide the extension direction of the corresponding strip-shaped welding materials on the surface of the solar cell), so that the corresponding strip-shaped welding materials extend in the predetermined laying direction;

[0041] The heating and welding unit can directly heat and / or indirectly heat the strip-shaped welding materials at each alignment groove (and can also include the areas near each alignment groove) during the relative translation process, so that each strip-shaped welding material is heated and welded to the solar cell.

[0042] Specifically, in solution two:

[0043] The multiple pressing members are multiple pressing rods; the multiple pressing rods are arranged side by side, each of the multiple pressing rods includes a pressing end facing the solar cell, and a guiding groove is respectively provided at the pressing end of each of the multiple pressing rods. More specifically, each pressing rod is respectively equipped with: a swing rod mechanism for pressing the pressing end of the pressing rod against the solar cell; and the pressing rod serves as the swing rod in the swing rod mechanism (the multiple pressing rods can swing around the same axis). During the relative translation process, the pressing end of the pressing rod can float up and down relative to the surface of the solar cell, so that the guiding groove at the pressing end is always pressed on the corresponding strip-shaped welding material on the surface of the solar cell. A wire threading hole is also provided on the pressing rod; during the relative translation process, the strip-shaped welding material first passes through the wire threading hole and then through the guiding groove. For details, see Figure 3 : Figure 3 In Figure 3 , the strip-shaped welding material is a flat welding tape with a width of 0.3 mm and a thickness of 0.1 mm. The guiding groove at the bottom pressing end of the pressing rod is a rectangular groove with a depth of 0.05 mm and a width of 0.35 mm. A small bearing is provided on the pressing rod. The pressing rod serves as the swing rod in the swing rod mechanism. The swing rod mechanism includes a spring for pressing the pressing end of the pressing rod against the solar cell. A wire threading hole is also provided on the pressing rod. The welding tape passes through the wire threading hole and is drawn to the guiding groove at the bottom of the pressing rod. The entire pressing rod is in an inclined state above the solar cell. The pressing rod can rotate through the small bearing on it. To increase the pressure of the pressing rod on the welding wire, a spring is provided at the upper end of the pressing rod. Through the stretching of the spring, the guiding groove at the bottom of the pressing rod applies a greater pressure to the welding wire. Each welding wire corresponds to a pressing rod, and the rotation of each pressing rod is supported by the small bearing on it. Therefore, each pressing rod is independent of each other, and the pressing rod can make the pressing end / guiding groove float up and down within a certain height range through rotation; the heating and welding unit adopts the current heating method. Direct current is passed between the pressing rod and the metal guide wheel to heat the welding tape between the metal guide wheel and the pressing rod to melt the tin. When the welding tape is pressed and contacted with the electrode on the surface of the solar cell by the pressing rod, the welding tape is welded to the electrode through the melted tin.

[0044] Alternatively, the multiple pressing members are multiple pressing rods or multiple pressing wheels; the multiple pressing wheels are arranged side by side (the multiple pressing wheels share the same axis), the side circumferential surfaces of the multiple pressing wheels all face the solar cell, a guiding groove is respectively provided on the side circumferential surfaces of the multiple pressing wheels, and the guiding groove is an annular groove sharing the same axis with the pressing wheel. More specifically, each pressing wheel is respectively equipped with: a swing rod mechanism for pressing the side circumferential surface of the pressing wheel against the solar cell; and the pressing wheel is hinged to the swing rod in the swing rod mechanism. During the relative translation process, the pressing wheel can float up and down relative to the surface of the solar cell, so that the guiding groove on the side circumferential surface of the pressing wheel is always pressed on the corresponding strip-shaped welding material on the surface of the solar cell. For details, see Figure 4 : Figure 4In it, the strip-shaped welding material uses a welding wire with a circular cross-sectional shape. The diameter of the welding wire is 0.2 mm. The wire guiding groove on the circumferential side of the pressure wheel is a semi-circular groove with a depth of 0.1 mm. A small bearing is provided on the pressure rod. The pressure rod serves as the swing rod in the swing rod mechanism. The swing rod mechanism includes a spring that presses the lower end of the swing rod against the solar cell. And a small bearing and a wire passing hole are provided on the swing rod. The welding wire passes through the wire passing hole and is drawn to the wire guiding groove of the pressure wheel at the bottom of the swing rod. The entire swing rod is in an inclined state above the solar cell. The swing rod can rotate through the small bearing on it. To increase the pressure of the swing rod on the welding wire, a spring is provided at the upper end of the swing rod. Through the stretching of the spring, the pressure wheel at the bottom of the swing rod applies a greater pressure to the welding wire. Each welding wire corresponds to a swing rod, and the rotation of each swing rod is supported by the small bearing on it. So each swing rod is independent of each other, and the pressure wheel / wire guiding groove can float up and down within a certain height range through the rotation of the swing rod. The heating and welding unit uses a hot air gun. The hot air gun is used to blow air at the position point compacted by the pressure wheel, so that the solder on the welding wire melts and is welded to the electrode grid line.

[0045] The present invention also provides a welding method for a solar cell. The above welding device is adopted to weld the strip-shaped welding material on the surface of the solar cell. During welding, a relative translation is generated between the pressing member and the solar cell (the direction of relative translation is the predetermined laying direction of the strip-shaped welding material). And during the relative translation process:

[0046] The wire guiding groove on the pressing member presses on the corresponding strip-shaped welding material on the surface of the solar cell, and the wire guiding groove guides the laying direction of the corresponding strip-shaped welding material (that is, guides the extending direction of the strip-shaped welding material on the surface of the solar cell), so that the strip-shaped welding material extends according to the predetermined laying direction.

[0047] And the heating and welding unit directly heats and / or indirectly heats the strip-shaped welding material at each wire guiding groove (and can also include the area near each wire guiding groove), so that the strip-shaped welding material is heated and the welding with the solar cell is completed.

[0048] The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A welding device for solar cells, characterized in that Comprising: A pressing member provided with a guiding groove, the pressing member can perform relative translation with respect to the battery cell to which strip-shaped welding material needs to be welded, the guiding groove on the pressing member faces the battery cell, the guiding groove allows the corresponding strip-shaped welding material to pass through, during the relative translation process, the guiding groove presses on the corresponding strip-shaped welding material on the surface of the battery cell, and the guiding groove guides the extending direction of the strip-shaped welding material on the surface of the battery cell, so that the strip-shaped welding material extends in a predetermined layout direction; and during the relative translation process, the pressing member can float up and down relative to the surface of the battery cell, so that the guiding groove always presses on the corresponding strip-shaped welding material on the surface of the battery cell, accommodating the height fluctuations of the surface of the battery cell and the strip-shaped welding material during the translation process, and ensuring the real-time fitting of the guiding groove and the strip-shaped welding material; A heating and welding unit, the heating and welding unit can directly heat and / or indirectly heat the strip-shaped welding material at the guiding groove during the relative translation process, so that the strip-shaped welding material is heated and completes welding with the battery cell; The direction of the relative translation is the predetermined layout direction of the strip-shaped welding material; The pressing member is further provided with: a wire threading hole for guiding the strip-shaped welding material to approach the guiding groove; during the relative translation process, the strip-shaped welding material first passes through the wire threading hole and then through the guiding groove.

2. The welding device for solar cells according to claim 1, characterized in that, Multiple strip-shaped welding materials need to be welded on the surface of the battery cell; The pressing member is provided with multiple guiding grooves, the multiple guiding grooves all face the battery cell, the multiple guiding grooves are arranged side by side, and the guiding grooves correspond to the strip-shaped welding materials one by one. During the relative translation process, the guiding grooves press on the corresponding strip-shaped welding materials on the surface of the battery cell, and the guiding grooves guide the layout direction of the corresponding strip-shaped welding materials; The heating and welding unit can simultaneously directly heat and / or indirectly heat the strip-shaped welding materials at each guiding groove, so that each strip-shaped welding material is heated and completes welding with the battery cell.

3. The welding device for solar cell wafers according to claim 1, wherein, Multiple strip-shaped welding materials need to be welded on the surface of the battery cell; There are multiple pressing members, the multiple pressing members can perform synchronous translation, the guiding grooves on the multiple pressing members all face the battery cell, the guiding grooves on the multiple pressing members are arranged side by side, and the guiding grooves correspond to the strip-shaped welding materials one by one. During the relative translation process, the guiding grooves press on the corresponding strip-shaped welding materials on the surface of the battery cell, and the guiding grooves guide the layout direction of the corresponding strip-shaped welding materials; The heating and welding unit can simultaneously directly heat and / or indirectly heat the strip-shaped welding materials at each guiding groove, so that each strip-shaped welding material is heated and completes welding with the battery cell.

4. The welding device for solar cells according to claim 1, 2 or 3, characterized in that, Further comprising: A translation driving unit for causing relative translation between the pressing member and the battery cell.

5. The welding device for solar cells according to claim 4, characterized in that, The translation driving unit also causes the heating and welding unit to translate synchronously with the pressing member.

6. The welding device for solar cells according to claim 1, 2 or 3, characterized in that The strip-shaped welding material is a welding tape or a welding wire.

7. The welding device for solar cells according to claim 1, 2 or 3, characterized in that The cross-sectional shape of the strip-shaped welding material is circular, triangular or rectangular.

8. The welding device for solar cell wafers according to claim 1, 2 or 3, characterized in that, The cross-sectional shape of the guiding groove matches the cross-sectional shape of the corresponding strip-shaped welding material.

9. The soldering device for solar cells according to claim 1, 2 or 3, characterized in that The depth of the guiding groove is not greater than the thickness of the corresponding strip-shaped welding material.

10. The welding device for solar cells according to claim 2, characterized in that, The pressing member provided with multiple guiding grooves is an elastic pressing piece or a pressing wheel; The elastic pressing piece includes a pressing end facing the battery cell, and multiple guiding grooves are provided on the pressing end of the elastic pressing piece; The side circumference of the pressing wheel faces the battery cell, and a plurality of guiding grooves are provided on the side circumference of the pressing wheel, and the guiding grooves are annular grooves coaxial with the pressing wheel.

11. The soldering device for solar cells according to claim 10, characterized in that, The pressing ends of the elastic pressing pieces are divided into a plurality of pressing strips facing the battery cell, and one or several guiding grooves are respectively provided at the ends of each pressing strip facing the battery cell.

12. The welding device for solar cells according to claim 10, characterized in that, The pressing wheel is a soft wheel.

13. The welding device for solar cells according to claim 3, wherein, The plurality of pressing members are a plurality of pressing rods or a plurality of pressing wheels; The plurality of pressing rods are arranged side by side. The plurality of pressing rods respectively include pressing ends facing the battery cell, and guiding grooves are respectively provided at the pressing ends of the plurality of pressing rods; The plurality of pressing wheels are arranged side by side. The side circumferences of the plurality of pressing wheels all face the battery cell, and guiding grooves are respectively provided on the side circumferences of the plurality of pressing wheels, and the guiding grooves are annular grooves coaxial with the pressing wheels.

14. The welding device for solar cell wafers according to claim 13, wherein, Each pressing rod is respectively equipped with: a swing rod mechanism for pressing the pressing end of the pressing rod against the battery cell; and the pressing rod serves as the swing rod in the swing rod mechanism.

15. The welding device for solar cells according to claim 13, characterized in that, Each pressing wheel is respectively equipped with: a swing rod mechanism for pressing the side circumference of the pressing wheel against the battery cell; and the pressing wheel is hinged to the swing rod in the swing rod mechanism.

16. The welding device for solar cell chips according to claim 1, 2 or 3, characterized in that, The heating and welding unit adopts one or several of the methods of hot air heating, infrared heating, electromagnetic induction heating, conduction heating, and current heating.

17. A welding method for a solar cell, characterized in that, Using the welding device described in any one of claims 1 to 16, welding a strip-shaped welding material on the surface of the battery cell; during welding, relative translation is generated between the pressing member and the battery cell; and during the relative translation process: The guiding grooves on the pressing member are pressed on the corresponding strip-shaped welding material on the surface of the battery cell, and the guiding grooves guide the laying direction of the corresponding strip-shaped welding material; And the heating and welding unit directly heats and / or indirectly heats the strip-shaped welding material at each guiding groove, so that the strip-shaped welding material is heated and the welding with the battery cell is completed.

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