Welding tool, welding equipment, battery production system, solar battery piece and battery assembly

Abstract

The utility model is applicable to the technical field of photovoltaic manufacturing, and provides a welding tool, welding equipment, a production system, a solar cell and a cell assembly, the welding tool is used for welding bus bars, the bus bars are arranged on at least two isolating bars, and the isolating bars are sequentially arranged along a first direction; the welding tool comprises a base plate and at least one protruding part protruding out of the plate face of the base plate. The protruding part extends in the second direction, the first direction intersects with the second direction, the cross section of the protruding part is in a smooth protruding shape, the distance between the two ends of the cross section is smaller than or equal to the distance between the two adjacent isolating bars, and the distance between the highest point of the cross section and the base plate is equal to the thickness of the isolating bars. Due to the axial symmetry shape and the smooth design of the protruding parts, damage to the bus bar and the isolating bar can be avoided, meanwhile, good matching of the welding tool and the isolating bar is guaranteed through the design of the height and the width of the protruding parts, and the welding tool can press the bus bar to be close to the position of a welding strip to be welded in the welding process; and the occurrence of pseudo soldering is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic manufacturing technical field especially relates to a welding tool of busbar and related equipment, system and product. BACKGROUND

[0002] In the production process of photovoltaic modules, with the application of back contact cell technology, in order to improve the power generation efficiency and aesthetic, it is usually necessary to hide the busbar in the back of the cell, and adjust the interlamination spacing according to the design requirements. However, the traditional welding method faces many technical challenges in this process. First, the busbar and the solder ribbon contact badly, which can easily lead to virtual welding phenomenon, thereby affecting the effective conduction of current and reducing the output power of photovoltaic modules. Secondly, if the contact area is too large, uneven heat distribution during welding may cause cell sheet hidden crack, damage its structural integrity, and during the welding process, the contact between the busbar and the cell sheet will have a heat conduction effect, which will greatly increase the risk of hidden crack during welding.

[0003] These problems not only directly affect the electrical performance of photovoltaic modules, but also adversely affect their long-term use stability, increasing the cost of component failure and maintenance. Therefore, an improved welding tool is needed to solve these problems, to ensure accurate and stable welding contact between the busbar and the solder ribbon, and to reduce the occurrence of virtual welding and cell sheet hidden crack. Such tool should have high installation accuracy and adjustment flexibility to ensure that the overall power generation and appearance quality of the module are improved without increasing the production cost. SUMMARY

[0004] The utility model provides a kind of welding tool of busbar and related equipment, system and product, to solve the problem that uniform, close contact cannot be formed between busbar and solder ribbon, virtual welding and cell sheet hidden crack are caused during welding process.

[0005] In the first aspect, the utility model provides a kind of welding tool of busbar, and the busbar is arranged on at least two isolation strips, and the isolation strip is sequentially arranged along the first direction, and the welding tool includes substrate and at least one protruding part of the plate surface of substrate;

[0006] The protruding part extends along the second direction, and the first direction intersects with the second direction, and the protruding part is provided with an opening corresponding to the welding position.

[0007] The utility model sets up protruding part protruding from the plate surface of substrate on substrate, and sets up the opening corresponding to the welding position on protruding part, can better make the busbar and welding position close, uniform contact by protruding part, and reduce virtual welding.

[0008] Optionally, the surface profile of the protruding part is a lune, the distance between two ends of the lune is less than or equal to the distance between two adjacent isolation strips, and the distance from the highest point of the lune to the substrate is the thickness of the isolation strip.

[0009] The protruding part is in the shape of a lune, so that the bus bar can tightly contact the welding strip after being pressed down, virtual welding is avoided, the bus bar and the welding strip are only in contact at the welding position, heat is not directly transmitted to the object to be welded (for example, a solar cell) through the bus bar after laser welding, the direct transmission of thermal stress of the welding area is reduced, and a flow channel is formed in the process of pressing down the bus bar, so that heat dissipation is facilitated.

[0010] Optionally, the cross-sectional arc of the surface profile of the protruding part is 0.789 rad to 1.210 rad.

[0011] The cross-sectional arc of the surface profile of the protruding part is set to 0.789 rad to 1.210 rad, so that the flow channel in the preset range is formed in the process of pressing down the bus bar, and heat dissipation is facilitated.

[0012] Optionally, adjacent protruding parts are connected, and a recess opposite to the protruding direction of the protruding part of the protruding part is arranged at the connection position.

[0013] The recess opposite to the protruding direction of the protruding part is arranged at the connection position, so that heat dissipation is better during laser welding.

[0014] Optionally, the protruding part is connected with the substrate through a connecting part.

[0015] Optionally, the connecting part is a connecting plate matched with the substrate, the connecting plate is fixedly connected with the substrate, and the protruding part is detachably connected with the connecting plate.

[0016] Optionally, a plurality of connecting hole positions are arranged on the connecting plate corresponding to one protruding part.

[0017] Optionally, a connecting sliding groove extending in a first direction is arranged on the connecting plate corresponding to one protruding part.

[0018] Optionally, the protruding part has a hemispherical cross section at least on a part of the section.

[0019] Optionally, the height of the protruding part is 100 um to 250 um.

[0020] The height of the protruding part is reasonably arranged, so that the position of the bus bar and the welding strip can be better contacted, and the virtual welding problem caused by the poor contact can be avoided.

[0021] Optionally, the protruding part comprises a plurality of protruding parts, each of the protruding parts is sequentially arranged along the first direction, and the interval distance between each of the protruding parts is 18.10mm-18.20mm.

[0022] The interval distance between each of the protruding parts is 18.10-18.20mm, so that the distance between the solar cell piece and the same polarity welding strip can be better matched, and the good welding effect can be ensured.

[0023] In the second aspect, the utility model provides a kind of welding equipment, including the welding tool of any one of the bus bar of the first aspect described above.

[0024] Optionally, it further includes laser emission device, for emitting laser to the object to be welded.

[0025] In the third aspect, the utility model provides a kind of solar cell piece, and the cell piece is prepared using the welding tool of any one of the first aspect described above or using the welding equipment of any one of the second aspect described above.

[0026] In the fourth aspect, the utility model provides a kind of battery assembly, including the solar cell piece described above in the third aspect.

[0027] In the fifth aspect, the utility model provides a kind of solar cell production system, including the welding tool of any one of the first aspect, the welding equipment of any one of the second aspect described above, the solar cell piece described above in the third aspect, the battery assembly described above in the fourth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the cross-sectional structure schematic drawing of the first welding tool provided by the utility model;

[0029] Figure 2 It is the cross-sectional structure schematic drawing of the second welding tool provided by the utility model;

[0030] Figure 3 It is the cross-sectional structure schematic drawing of the third welding tool provided by the utility model;

[0031] Figure 4 It is the cross-sectional structure schematic drawing of solar cell piece;

[0032] Figure 5 It is the structure schematic drawing of the second welding tool applied to solar cell piece;

[0033] Figure 6is a schematic view of a third welding tool applied to a solar cell;

[0034] Figure 7 is an enlarged view of A;

[0035] Figure 8 is an enlarged view of B.

[0036] Explanation of reference signs:

[0037] 100, welding tool; 101, base plate; 102, protrusion; 1021, opening; 103, recess; 104, connecting portion;

[0038] 200, solar cell; 201, bus bar; 202, isolation bar; 203, solder strip;

[0039] 300, first channel; 400, second channel. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application clearer, the following further describes the present application in conjunction with the accompanying drawings and examples. The examples of the examples are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The examples described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application. In addition, it should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0041] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0043] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electric connection or can communicate with each other;It can be directly connected, also can be indirectly connected through intermediate medium, can be the communication or the interaction of two elements of two elements inside.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0044] In the utility model, unless another explicit provision and limitation, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.The "below", "below" and "below" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model.For the purpose of simplifying the disclosure of the utility model, the components and settings of specific examples are described in the following.Their purpose is not to limit the utility model, of course, and they are only examples.In addition, the utility model can repeatedly refer to numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.The utility model provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0046] The welding tool of the utility model is suitable for the scene that needs to set bus bars on multiple isolation strips and weld.The axisymmetric shape and smooth design of the protruding part can avoid damage to the bus bar and the isolation strip, and the design of the height and width of the protruding part also ensures good cooperation between the welding tool and the isolation strip, so that the welding tool can press the bus bar close to the position of the welding ribbon to be welded during welding, avoiding the occurrence of false welding.

[0047] Example One

[0048] As Figure 1 , Figure 4 , Figure 7 And Figure 8As shown, the embodiment provides a welding tool 100 of a busbar 201, the busbar 201 is arranged on at least two isolation bars 202, the isolation bars 202 are arranged in sequence along a first direction, the welding tool 100 comprises a substrate 101 and at least one protruding part 102 protruding from a plate surface of the substrate 101.

[0049] The protruding part 102 extends along a second direction, the first direction intersects the second direction, and the outer periphery of the protruding part 102 is provided with a protruding part, and the protruding part is provided with an opening 1021 corresponding to the position to be welded.

[0050] The utility model discloses a protruding part 102 is arranged on the substrate 101, and the opening 1021 corresponding to the position to be welded is arranged on the protruding part, so that the busbar can be better contacted with the welding position closely and uniformly through the protruding part, and false welding is reduced.

[0051] The welding tool 100 comprises a substrate 101, and the protruding part 102 is arranged on the substrate 101. The protruding part 102 protrudes from the surface of the substrate 101 and is used for pressing the busbar 201. The protruding part 102 can be arranged one or more, and the specific number of the protruding part 102 is arranged according to the number of positions to be welded. When the protruding part 102 is arranged more, the plurality of protruding parts 102 are arranged in sequence along the first direction, and in some embodiments, the first direction can be arranged as the horizontal direction. The interval distance between each protruding part 102 is 18.10mm-18.20mm, that is, the interval distance can be arranged as 18.10mm, 18.15mm, 18.20mm or any one value in the interval distance of 18.10mm-18.20mm, and the utility model does not limit this.

[0052] The utility model discloses the interval distance between each protruding part 102 is arranged as 18.10-18.20mm, can better match the distance between the solar cell piece 200 and the same polarity welding strip, guarantees good welding effect.

[0053] The protruding portions 102 extend along a second direction, and adjacent protruding portions 102 are parallel to each other. The first direction and the second direction are intersected with each other, and specifically, the first direction and the second direction can be perpendicular to each other (for example, vertical direction), or the first direction and the second direction can be other directions intersected at an angle, for example, the two directions can be diagonal directions of the substrate 101, or the first direction and the second direction are intersected at an angle, and the intersection angle can be 30 degrees, 40 degrees, etc., and the utility model does not make a limitation hereon, and the specific setting direction of the bus bar 201 is changed, and the utility model does not make a limitation hereon. The design is to ensure that the protruding portions 102 can span multiple isolation strips 202, so as to stably fix the bus bar 201. In some embodiments, the first direction can be set as a vertical direction, and the second direction can be set as a horizontal direction, or other directions with a certain angle of inclination to the horizontal plane, and the utility model does not make a limitation hereon.

[0054] In some embodiments, the surface of the protruding portion is smooth, which helps to avoid damaging the bus bar 201 or the isolation strip 202. The solder strip 203 that needs to be welded is arranged at the midpoint of two adjacent isolation strips 202, and therefore the cross section of the protruding portion 102 can be an axisymmetric shape, and the axis of symmetry is the highest point of the cross section of the protruding portion 102. The cross section of the protruding portion 102 can also be other smooth protruding shapes, and the highest point of the cross section corresponds to the position of the solder strip 203 to be welded. The highest point of the cross section of the protruding portion 102 corresponds to the position of the solder strip 203 to be welded, and the width (distance between the two ends of the cross section) of the protruding portion 102 is not greater than the distance between the two adjacent isolation strips 202, so that the protruding portion 102 can extend into the position between the isolation strips 202, and the bus bar 201 can be pressed to the position of the solder strip 203, so that the solder strip 203 is close to the position of the solder strip 203 to be welded.

[0055] The distance from the highest point of the protruding portion 102 to the substrate 101 is equal to the thickness of the isolation strip 202. This height matching can ensure that the bus bar 201 is kept in the same plane as the isolation strip 202 when being pressed, which helps to improve the welding precision and consistency.

[0056] In some embodiments, the height of the protruding portion can be set as 100um-250um, for example, 100um, 150um, 200um, 250um, and it can be understood that the height can also be set as any value within 100um-250um, and the utility model does not make a limitation hereon.

[0057] The utility model can ensure that the bus bar and the solder strip position are better contacted by reasonably setting the height of the protruding portion, and the problem of virtual welding caused by poor contact is avoided.

[0058] In some embodiments, the protrusions have a semispherical cross-section at least on a part of the section, i.e. at least one of the cross-section or the longitudinal section of the protrusions is semispherical.

[0059] In the welding process, the welding tool 100 is covered on the solar cell 200 to be welded, so that each protrusion 102 of the welding tool 100 corresponds to the position between two isolation strips 202, the highest point of the protrusion 102 corresponds to the position of the solder strip 203 to be welded between the two isolation strips 202, the pressure is applied to the welding tool 100 towards the solar cell 200, so that the protrusion 102 presses the bus bar 201, the bus bar 201 is in contact with the solder strip 203 to be welded, and then laser welding is performed to ensure the welding quality between the bus bar 201 and the solder strip 203, and to avoid the occurrence of false welding.

[0060] In the embodiment, the welding tool 100 is suitable for the scene where the bus bar 201 needs to be arranged on the plurality of isolation strips 202 and welded. The axisymmetric shape and smooth design of the protrusion 102 can avoid damage to the bus bar 201 and the isolation strip 202, and the design of the height and width of the protrusion 102 also ensures the good cooperation of the welding tool 100 with the isolation strip 202, so that the welding tool 100 can press the bus bar 201 close to the position of the solder strip 203 to be welded during welding, and the occurrence of false welding is avoided.

[0061] Example Two

[0062] As shown in Figure 1 , on the basis of the first embodiment, the surface profile of the protrusion is a lune, the distance between the two ends of the lune is less than or equal to the distance between the two adjacent isolation strips 202, and the distance from the highest point of the lune to the substrate 101 is the thickness of the isolation strip 202.

[0063] The surface profile of the protrusion 102 is a lune, which means that the arc surface is a part less than a semicircle. This shape is beneficial to achieve a strong pressing force at the vertex of the arc surface, and provides certain support on both sides of the vertex. The distance between the two ends of the lune is less than or equal to the distance between the two adjacent isolation strips 202, so that the protrusion 102 can extend into the position between the isolation strips 202, and the bus bar 201 can be pressed close to the position of the solder strip 203, so that the bus bar 201 is close to the position of the solder strip 203 to be welded, and the bus bar 201 forms a plurality of protrusions 102. The distance from the highest point of the lune corresponding to each protrusion 102 to the substrate 101 is equal to the thickness of the isolation strip 202, which ensures that the bus bar 201 can be tightly pressed during pressing.

[0064] The utility model discloses a convex part is provided as inferior arc shape can guarantee that the convex part 102 can make that the bus bar is close to the welding strip after pressing down, avoids the false soldering, and can only be in the contact of bus bar and welding strip position at the welding position, and the heat after laser welding will not be directly passed through the bus bar and be delivered to the object (for example solar cell piece 200) of waiting to weld, reduces the heat stress of welding area direct transmission, and the flow passage can be formed in the process of pressing down the bus bar since the convex part 102 is inferior arc shape in the process of laser welding, and the flow passage formed in the process of laser welding is favorable to heat dissipation.

[0065] In some embodiments, the surface profile of the convex portion is an inferior arc shape with a cross-sectional arc of 0.789 rad to 1.210 rad.

[0066] The utility model discloses a convex part's surface profile is inferior arc shape's cross-sectional arc is set as 0.789 rad ~ 1.210 rad, can guarantee the flow passage in the preset range formed in the process of pressing down the bus bar, is favorable to heat dissipation.

[0067] As shown in Figure 5 and Figure 7 The vertex of the inferior arc shape exerts the main pressing force on the bus bar 201, and at the same time, the two sides of the arc surface exert extrusion force on the bus bar 201, causing the deformation of the bus bar 201. Since the bus bar 201 forms certain deformation when subjected to the extrusion of the arc surface, two first channels 300 are formed between the bus bar 201 and the two isolation strips 202, respectively. These first channels 300 can serve as heat dissipation paths, helping to dissipate heat during the welding process and avoiding the damage of elements due to local overheating.

[0068] Example Three

[0069] As shown in Figure 3 On the basis of the first embodiment, the adjacent convex portions 102 are connected, and a recess 103 opposite to the protruding direction of the convex portion 102 is arranged at the connecting position.

[0070] The utility model discloses a convex portion 102's protruding direction opposite recess 103 can better carry out the heat dissipation in the process of laser welding through setting up at the connecting position.

[0071] The adjacent convex portions 102 are connected to each other, which can improve the overall stability of the welding tool 100. Through the connection, the single convex portion 102 is not easy to deform, and can stably exert uniform pressure on the bus bar 201 during the welding process, ensuring that the bus bar 201 remains in the optimal position during welding.

[0072] As shown in Figure 6 and Figure 8As shown, at the connection of the protruding part 102, a recess 103 is arranged in the opposite direction of the protruding part 102. This recess 103 not only realizes the seamless transition between the adjacent protruding parts 102 in structure, but also forms a second channel 400 at the position of the recess 103. These second channels 400 make it easier to dissipate the heat generated during welding, further preventing the accumulation of heat during welding and causing the components to overheat or damage.

[0073] Example Four

[0074] As Figure 2 shown, on the basis of example one, the protruding part 102 is connected with the base plate 101 through the connecting part 104.

[0075] By using the connecting part 104 to connect the protruding part 102 with the base plate 101, the entire tooling can realize modular design. This structure facilitates quick replacement when a certain protruding part 102 needs to be adjusted or replaced, without the need to change the entire base plate 101 or other components.

[0076] It can be understood that, since the protruding part 102 is connected with the base plate 101 through the connecting part 104, when the surface profile of the protruding part is a inferior arc, the distance from the highest point of the inferior arc to the connecting part 104 is the thickness of the isolation strip 202.

[0077] Example Five

[0078] On the basis of example four, the connecting part 104 is a connecting plate matched with the base plate 101, and the connecting plate is fixedly connected with the base plate 101, and the protruding part 102 is detachably connected with the connecting plate.

[0079] The connecting part 104 is a connecting plate, and the plate surface of the connecting plate is matched with the base plate 101, so as to better share and transfer the pressure applied by the base plate 101. The protruding part 102 is detachably connected with the connecting plate, and when a certain protruding part 102 is worn or damaged, it can be individually disassembled for maintenance or replacement, without affecting the overall structure of the base plate 101. This greatly simplifies the maintenance process, reduces downtime and maintenance costs.

[0080] Example Six

[0081] On the basis of example five, a plurality of groups of connecting holes are arranged on the connecting plate corresponding to a protruding part 102.

[0082] The design of multiple sets of connecting hole positions allows the protruding part 102 to be finely adjusted on the connecting plate, adapting to different workpiece sizes and shape requirements. This is particularly important in welding or machining tasks that require high precision. Having multiple hole positions means that the same connecting plate can be adapted to multiple different types or specifications of protruding parts 102. This reduces the need for different connecting plates and improves the versatility of the equipment.

[0083] Example Seven

[0084] On the basis of Embodiment Five, a connecting slot extending in the first direction is provided on the connecting plate corresponding to one protruding part 102.

[0085] The slot allows for stepless adjustment of the protruding part 102. This continuous adjustment method allows the optimal position of the protruding part 102 to be found more accurately during installation and debugging, meeting the requirements of different workpieces. The slot design improves the adaptability of the equipment and allows it to quickly respond to changes in product or process requirements. This is particularly important when the production line needs to quickly switch products or adjust.

[0086] Example Eight

[0087] The present embodiment also provides a welding device comprising the welding tool of the above-mentioned embodiments.

[0088] In some embodiments, the welding device further comprises a laser emitting device for emitting laser to the object to be welded, such as the solar cell 200 to be welded.

[0089] Example Nine

[0090] The present embodiment also provides a solar cell 200 prepared using the welding tool of the above-mentioned embodiments or using the welding device of the above-mentioned embodiments.

[0091] Example Ten

[0092] The present embodiment also provides a battery assembly comprising the solar cell 200 of the above-mentioned embodiments.

[0093] Example Eleven

[0094] The present embodiment also provides a solar cell production system comprising the welding tool of the above-mentioned embodiments, the welding device of the above-mentioned embodiments, the solar cell 200 of the above-mentioned embodiments, and the battery assembly of the above-mentioned embodiments.

[0095] The welding device of the present embodiment has the same beneficial effects as the welding tool of the above-mentioned bus bar, which will not be repeated here.

[0096] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding jig for welding a busbar, the busbar being arranged on at least two isolation bars, the isolation bars being arranged in order along a first direction, characterized in that, The welding tool includes a base plate and at least one protruding part protruding from the plate surface of the base plate; The protruding part extends along a second direction, the first direction intersects the second direction, and the protruding part is provided with an opening corresponding to the welding position.

2. The welding fixture of claim 1, wherein, The surface profile of the protruding part is in the shape of a lune, the distance between the two ends of the lune is less than or equal to the distance between two adjacent isolation strips, and the distance from the highest point of the lune to the base plate is the thickness of the isolation strip.

3. The welding fixture of claim 2, wherein, The cross-sectional curvature of the surface profile of the protruding part in the shape of a lune is 0.789 rad to 1.210 rad.

4. The welding fixture of claim 1, wherein, Adjacent protruding parts are connected, and a recess opposite to the protruding direction of the protruding part is arranged at the connection position.

5. The welding fixture of claim 1, wherein, The protruding part is connected to the base plate through a connecting part.

6. The welding fixture of claim 5, wherein, The connecting part is a connecting plate matched with the base plate, the connecting plate is fixedly connected with the base plate, and the protruding part is detachably connected with the connecting plate.

7. The welding fixture of claim 6, wherein, A plurality of connecting hole positions are arranged on the connecting plate corresponding to one protruding part.

8. The welding fixture of claim 6, wherein, A connecting sliding groove extending along the first direction is arranged on the connecting plate corresponding to one protruding part.

9. The welding fixture of claim 1, wherein, The protruding part has a semispherical cross section at least in a partial section.

10. The welding fixture of claim 1, wherein, The height of the protruding part is 100 um to 250 um.

11. The welding fixture of claim 1, wherein, The surface of the protruding part is smooth.

12. The welding fixture of claim 1, wherein, The protruding part includes a plurality of protruding parts, each of which is arranged in sequence along the first direction, and the interval distance between each of the protruding parts is 18.10 mm to 18.20 mm.

13. A welding apparatus characterized by, The welding tool includes any one of claims 1 to 12.

14. The welding apparatus of claim 13, wherein, Further comprising a laser emitting device for emitting laser to the object to be welded.

15. A battery production system characterized by comprising: The welding tool includes any one of claims 1-12 or the welding device of any one of claims 13-14.

16. A solar cell, characterized by, The battery piece is prepared by using the welding tool of any one of claims 1-12 or the welding device of any one of claims 13-14.

17. A battery assembly characterized by, The solar cell piece includes the solar cell piece of claim 16.

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