Welding device and battery piece series welding machine

Abstract

The utility model discloses a welding device and a battery piece series welding machine, and belongs to the field of solar batteries. The welding device comprises a lamp box body which is arranged opposite to a battery string welding area, the battery string welding area bears a to-be-welded piece, and the to-be-welded piece is a welding strip and a battery piece which are stacked and to be welded; the moving mechanism is connected with the lamp box body, and the moving mechanism can drive the lamp box body to move so as to adjust the distance between the lamp box body and the to-be-welded part in at least one of the horizontal direction and the vertical direction; and the multiple focusing heaters are arranged on the lamp box body, and light rays emitted by the focusing heaters are focused to the welding position of the to-be-welded part. According to the method, the welding spots of the to-be-welded part are directly and accurately heated in a focusing heating mode, so that other unnecessary parts or areas can be prevented from being heated to deform and the like. Therefore, the welding device has the advantages of being uniform and stable in welding of the battery piece and the welding strip.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of solar cells, particularly to the field of manufacturing battery strings. Specifically, the present application relates to a focused heating welding device and a battery string welding machine for welding battery chips in series. Background Art

[0002] A photovoltaic battery string is formed by stacking solder tapes and battery chips in a predetermined order and welding the solder tapes to the grid lines of the battery chips. Traditional welding devices use infrared lamp tubes to irradiate and heat the welded parts to achieve welding. However, this method is relatively crude, and the welding effect is generally adjusted by welding power. Due to different heat dissipation conditions in the central and edge regions of the welding, there are often certain differences in the welding effect, affecting the uniformity and stability of welding. Summary of the Utility Model

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present utility model provides a welding device and a battery string welding machine to ensure that when welding and stringing solder tapes and battery chips, the welding points can be accurately heated and the welding effect is uniform and stable.

[0004] To solve the above problems, the technical solutions adopted in the present application are as follows:

[0005] The solution of the example of the present application is implemented through the following content.

[0006] In a first aspect, an example of the present application provides a welding device, which includes:

[0007] A lamp box body, which is disposed opposite to the battery string welding area. The battery string welding area carries the parts to be welded, and the parts to be welded are the solder tapes and battery chips to be welded stacked together;

[0008] A moving mechanism, which is connected to the lamp box body. The moving mechanism can drive the lamp box body to move to adjust the distance between the lamp box body and the parts to be welded in at least one of the horizontal and vertical directions; and,

[0009] A plurality of focused heaters, which are disposed on the lamp box body. The light emitted by the focused heaters is focused on the welding points of the parts to be welded.

[0010] The present application provides a welding device, which directly and accurately heats the welding points of the parts to be welded by means of focused heating, thereby avoiding deformation and the like of other unnecessary parts or regions due to heat. Therefore, the welding of battery chips and solder tapes using this welding device has the characteristics of uniform stability.

[0011] According to some examples of the first aspect of the present application, a plurality of focused heaters form at least two array units, and each array unit includes a plurality of focused heaters arranged in an array.

[0012] The array method facilitates the arrangement of multiple focusing heaters and also helps to adjust the distribution of welding heat using the array units.

[0013] According to some examples of the first aspect of the present application, each focusing heater is independently controlled, or each array unit is independently controlled, where being controlled includes controlling at least one of the working start time, working end time, working duration, and working power of the focusing heater.

[0014] The independent control between the focusing heaters or between the array units facilitates the targeted regulation of specific focusing heaters, thereby enabling precise welding at specific welding positions.

[0015] According to some examples of the first aspect of the present application, the focusing heaters are arranged on the same horizontal plane, or the heights of some of the focusing heaters are different, and the focusing heaters with different heights are arranged in a staggered manner in the horizontal direction.

[0016] Arranging the focusing heaters on the same horizontal plane facilitates processing and installation. The staggered installation of the focusing heaters with a height difference in the vertical direction facilitates heat dissipation.

[0017] According to some examples of the first aspect of the present application, the focusing heater includes a lamp base and a light source. Inside the lamp box body, there is a focusing lamp cover and an installation cavity for focusing the light emitted by the light source. The light source is installed on the lamp box body through the lamp base, and the light source is located inside the focusing lamp cover, and the focusing lamp cover focuses the light emitted by the light source.

[0018] The focusing lamp cover is used to focus the light emitted by the light source to the same focus point, thereby concentrating the heat of the light source at the focus point.

[0019] According to some examples of the first aspect of the present application, the focusing heater further includes a sealing glass installed below the focusing lamp cover, and the sealing glass is configured to seal the focusing lamp cover.

[0020] The sealing glass can prevent external substances from entering the inside of the focusing heater and affecting the light source.

[0021] According to some examples of the first aspect of the present application, the welding device further includes a cooling component, and the cooling component cools the focusing heaters in the welding device;

[0022] The welding device further includes a temperature sensor, and the temperature sensor is installed on the lamp box body to sense the temperature inside the lamp box.

[0023] Sensing the temperature inside the lamp box and using the cooling component to cool the installation cavity helps to avoid the temperature inside the installation cavity being too high and affecting the lifespan of the focusing heater, and can thus reduce safety hazards.

[0024] According to some examples of the first aspect of the present application, the cooling part includes a cooling groove arranged on the light box body, and a cooling liquid flows in the cooling groove.

[0025] The cooling efficiency can be improved by means of the coolant in the cooling tank.

[0026] According to some examples of the first aspect of the present application, the focusing heater is a point focusing heater or a strip focusing heater, each point focusing heater corresponds to heating a welding position on the workpiece to be welded, and the strip focusing heater corresponds to heating a group of welding positions in the same row on the workpiece to be welded.

[0027] Different types of focused heaters can be selected according to the characteristics of the workpiece to be welded, such as using a point-shaped focused heater to correspond to one welding position and a strip-shaped focused heater to correspond to a group of welding positions in the same row, so that welding can be achieved more accurately and efficiently.

[0028] According to some examples of the first aspect of the present application, the light box body has a concave space and a protective glass that encloses the concave space, and the focusing heater is arranged in the concave space. The light emitted by the focusing heater passes through the protective glass and is focused to the welding point of the parts to be welded.

[0029] The recessed space and protective glass help protect the focus heater from mechanical damage during operation and prevent the ingress of foreign matter.

[0030] In a second aspect, an example of the present application provides a battery cell stringing machine, the battery cell stringing machine comprising a battery cell feeding device, a welding ribbon feeding device, a conveying device, and a welding device as described above;

[0031] The cell loading device and the soldering strip loading device stack the cell and the soldering strip on the conveying device, the conveying device transports the stacked soldering strip and cell to the cell string welding area, and the welding device welds the soldering strip and cell into a cell string.

[0032] In this example, the welding device is used to directly heat and precisely weld the welding ribbon and the battery cell into a battery string. The welding is uniform and stable, and other unnecessary parts or components can be prevented from being deformed due to heat or other effects caused by heat.

[0033] According to some examples of the second aspect of the present application, the delivery device includes:

[0034] A conveyor belt is supported by a driving roller and a driven roller and is disposed below the light box body, and the conveyor belt receives the stacked solder strips and battery cells and is driven by the driving roller to convey the solder strips and battery cells; and,

[0035] The supporting heating plate is arranged below the conveyor belt and is used to heat the welding strips and battery cells carried by the conveyor belt.

[0036] While the focusing heater is heating, the support heating plate is used to heat synchronously, improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 FIG. is a schematic structural diagram of a cell string welding machine provided by an embodiment of the present application;

[0038] Figure 2 FIG. is a side view of a cell string with solder tapes on both sides in an embodiment of the present application;

[0039] Figure 3 FIG. is a top view of a cell string with solder tapes on both sides in an embodiment of the present application.

[0040] Figure 4 FIG. is a top view of a BC (Back Contact) cell string in an embodiment of the present application.

[0041] In the figure:

[0042] 100, conveying device; 200, welding device; 300, solder tape; 400, cell.

[0043] 110, transmission roller; 120, conveyor belt; 130, cell string welding area; 140, support heating plate

[0044] 210, light box body; 211, installation cavity; 212, focusing lamp cover;

[0045] 220, focusing heater; 230, cooling tank; 240, concave space; 250, protective glass. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0047] In the field of battery manufacturing technology, a photovoltaic cell string is formed by stacking solder tapes and cells in a predetermined order and welding the solder tapes to the grid lines of the cells. Therefore, how the cell string welding machine performs welding has a crucial impact on the quality of the formed cell string.

[0048] The grid lines mentioned here can be the main grid lines of the cells or the secondary grid lines of the cells.

[0049] Refer to Figure 1 , and in combination with Figure 2 , Figure 3 andFigure 4 As shown, an example of the present application provides a battery string welding machine, which includes a battery sheet feeding device (not shown in the figure), a welding tape feeding device (not shown in the figure), a welding device 200, and a conveying device 100. The battery sheet feeding device and the welding tape feeding device stack the battery sheet 400 and the welding tape 300 onto the conveying device 100. The conveying device 100 conveys the stacked welding tape 300 and battery sheet 400 to the battery string welding area 130. When the welding device 200 is facing the battery string welding area 130, it starts focusing and heating, and welds the welding tape 300 and the battery sheet 400 to form a battery string by means of this focusing and heating.

[0050] Exemplarily, the battery sheet feeding device includes a manipulator, and a suction cup for adsorbing the battery sheet is installed on the manipulator. The feeding of the battery sheet is realized by adopting this structure. Specifically, the battery sheet 400 is picked up by means of the battery sheet suction cup, and then the picked-up battery sheet 400 is stacked on the conveying device 100.

[0051] Exemplarily, the welding tape feeding device includes a moving module and a plurality of chucks installed on the moving module. The moving module drives the chucks to move, and thereby uses the chucks to clamp the welding tape 300, and then transfers the welding tape 300 clamped by the chucks to the conveying device 100, and the welding tape 300 and the battery sheet 400 are stacked on the conveying device 100.

[0052] Exemplarily, the conveying device 100 can adopt a plate-shaped conveying structure or a belt-shaped conveying structure, so as to convey the stacked welding tape 300 and battery sheet 400 to the battery string welding area 130, and the welding device 200 welds the welding tape 300 and the battery sheet 400 to form a battery string.

[0053] As above, the embodiments of the battery string welding machine, as well as the specific implementation examples of the conveying device 100, the battery sheet feeding device, and the welding tape feeding device, are introduced in combination with the accompanying drawings. It can be understood that the above examples are only for facilitating the understanding of the implementation of the present application. During specific implementation, the devices for feeding the welding tape 300, the devices for feeding the battery sheet 400, and the device for conveying and stacking the welding tape 300 and the battery sheet 400 are not limited to the examples described above.

[0054] The following further introduces the implementation manners of the welding device 200 in combination with the accompanying drawings.

[0055] Referring to Figure 1 and in combination with Figure 2 , Figure 3 and Figure 4 As shown, a welding device 200 provided by an embodiment of the present application includes a lamp box body 210, a moving mechanism (not shown in the figure), and a plurality of focusing heaters 220.

[0056] Among them:

[0057] The light box body 210 can be disposed opposite to the battery string welding area 130. Specifically, the light box body 210 is arranged face to face with the battery string welding area 130. For example, the light box body 210 is disposed directly above or directly below the battery string welding area 130, so that the radiated heat directly reaches the battery string welding area 130. Of course, the light box body 210 can also reach the state of being disposed opposite to the battery string welding area 130 after being moved. As described above, the battery string welding area 130 carries the parts to be welded (not shown in the figure), and the parts to be welded are the solder tapes 300 and the battery cells 400 to be welded stacked together.

[0058] The arrangement relationship between the solder tape 300 and the battery cell 400 in the parts to be welded can refer to Figure 2 and Figure 4 In the arrangement shown in Figure 2 , in the shown arrangement, half of the solder tape 300 in the middle of the battery string is connected to the front side of the adjacent battery cell 400, and the other half of the solder tape 300 is connected to the back side of the other adjacent battery cell 400. As shown in Figure 4 , the battery cell 400 and the solder tape 300 are stacked on the conveying device 100. It is also possible that the solder tape 300 is only connected to the back side of the battery cell 400. Specifically, the solder tape 300 can be below and the battery cell 400 can be above; or the solder tape 300 can be above and the battery cell 400 can be below.

[0059] The moving mechanism is connected to the light box body 210. The moving mechanism can drive the light box body 210 to move, thereby adjusting the distance between the light box body 210 and the parts to be welded. This distance is the spacing between the light box body 210 and the parts to be welded along at least one of the horizontal direction and the vertical direction. Through the distance adjustment achieved by this movement, it can be ensured that the light box body 210 is in a better welding operation position. For example, the parts to be welded are directly facing the light box body, and the distance between the two is appropriate to obtain a better welding effect.

[0060] In one implementation, the moving mechanism includes a transverse movement servo module. The moving mechanism can also include a lifting servo module, or the moving mechanism can also include both a transverse movement servo module and a lifting servo module at the same time.

[0061] A plurality of focusing heaters 220 are disposed on the light box body 210 and on the side of the light box body 210 facing the battery string welding area 130. And based on the characteristics of focusing heating and the aforementioned distance adjustment, the light emitted by the focusing heaters 220 is focused on the welding place of the parts to be welded.

[0062] Based on the foregoing introduction, the welding device 200 of this embodiment directly and precisely heats the solder joints of the workpiece to be welded by means of focused heating, thereby avoiding deformation and the like caused by other unnecessary parts or regions being heated. Therefore, the welding performed on the battery cell 400 and the solder tape 300 using this welding device 200 has the characteristics of being uniform and stable. The following describes the arrangement of the focusing heater 220 on the light box body 210.

[0063] In some embodiments, in order to facilitate the arrangement of multiple focusing heaters 220, the multiple focusing heaters 220 provided on the light box body 210 can be divided into at least two array units. Each array unit includes multiple focusing heaters 220 arranged in an array. Such an array method also helps to adjust the distribution of welding heat using the array units.

[0064] During specific implementation, in order to precisely weld a specific welding position without other parts / regions being severely thermally affected. The embodiments of the present application can also specifically control a specific focusing heater 220 to achieve heating and welding of a specific area (position / solder joint). To achieve this purpose, in one embodiment, each focusing heater 220 is independently controlled. By this means, any one focusing heater 220 or a combination of any multiple focusing heaters 220 can be independently used for welding operations. In another embodiment, each array unit is independently controlled. It can be understood that, compared with the welding area corresponding to a single focusing heater 220, the welding heating area corresponding to the array unit is larger. The controlled methods described in the above embodiments include controlling at least one of the working start time, working end time, working start duration, and working power of the focusing heater 220.

[0065] In one implementation manner, the focusing heater 220 can control the welding by controlling the working start time and the working end time, or can also control the welding by controlling the start time and the start duration, or control the welding effect by controlling the working power and the working start duration.

[0066] In some embodiments, the installation positions of the focusing heaters 220 on the light box body 210 can be on the same horizontal plane. Setting the focusing heaters 220 on the same horizontal plane facilitates processing and installation.

[0067] In some other embodiments, among the focusing heaters 220 installed on the light box body 210, some of the focusing heaters 220 have different installation heights. For example, the installation position of one or more of the focusing heaters 220 has a height difference from that of other focusing heaters 220, and the focusing heaters 220 with different heights are arranged in a staggered manner in the horizontal direction. Such an arrangement with different heights and horizontal staggering facilitates heat dissipation, preventing excessive heat accumulation from affecting too many focusing heaters 220 and reducing the service life of the focusing heaters 220.

[0068] In one implementation, the focusing heaters 220 are arranged in multiple rows, and there is a height difference in the installation positions of adjacent rows of focusing heaters 220. Alternatively, among the multiple focusing heaters 220, the installation height of the focusing heater 220 located at the central position is higher than that of the focusing heaters 220 located in the circumferential direction.

[0069] At the same time, this installation method with a height difference can also effectively improve the space utilization rate, avoiding insufficient installation space caused by all the focusing heaters 220 being arranged at the same height.

[0070] Of course, when the focusing heaters 220 are installed at different heights, the focal lengths of the focusing heaters 220 can be adaptively set to be different. The focal length of the focusing heater 220 with a higher installation height is greater than that of the focusing heater 220 with a lower installation height.

[0071] In some embodiments, the focusing heater 220 includes a lamp holder (not shown in the figure) and a light source (not shown in the figure). Inside the light box body 210, there are provided a focusing lamp cover 212 for focusing the light emitted by the light source and an installation cavity 211. The light source is installed on the light box body 210 through the lamp holder, and the light source is located inside the focusing lamp cover 212. The focusing lamp cover 212 focuses the light emitted by the light source so that the light emitted by the light source is focused to the same focal point, and further the heat of the light source is concentrated at the focal point, preventing the heat from spreading out and affecting other components or areas that do not require heat for welding. In this embodiment, the installation cavity 211 is located behind the focusing lamp cover 212. The focusing lamp cover 212 is provided with a through hole for the light source to enter, and the through hole communicates with the installation cavity 211. The lamp holder is provided with an installation hole position for installing the light source, and the installation end of the light source is fixed in the installation hole position. The lamp holder is embedded in the installation cavity 211 and fixedly connected to the light box body 210.

[0072] In still some other embodiments, the focusing heater 220 provided in the present application further includes a sealing glass, which is installed below the focusing lamp cover 212, and the sealing glass is configured to seal the focusing lamp cover 212 to form a sealed space, so that the light source in the sealed space is in a relatively independent space not affected by the outside package, which helps to prevent external substances from entering the inside of the focusing lamp cover 212 and affecting the use of the light source.

[0073] In some embodiments, the welding device 200 further includes a cooling component and a temperature sensor (not shown in the figure). The cooling component promotes heat conduction and cools the focusing heater 220 in the welding device 200. The temperature sensor is installed on the lamp box body 210 to sense the temperature inside the lamp box. Specifically, during implementation, the temperature sensor senses the temperature inside the lamp box and the cooling component is used to cool the installation cavity, which helps to avoid heat accumulation in the installation cavity and prevent its internal temperature from being too high, thus affecting the lifespan of the focusing heater 220, and can reduce potential safety hazards accordingly.

[0074] In some embodiments, the cooling part includes a cooling groove 230 provided on the lamp box body 210. The cooling groove 230 is arranged on the back side where the focusing heater 220 is installed, and the bottom surface of the cooling groove 230 can be arranged in a surface-contact form on this back side to increase the heat dissipation contact surface and thus improve the heat dissipation effect. In addition, a coolant is passed through the cooling groove 230, and the coolant in the cooling groove 230 can be used to improve the cooling efficiency. Specifically, during implementation, the coolant can flow through the cooling groove 230 in a flowing form, and the flow rate can be adjusted to adapt to different heat dissipation situations.

[0075] In one implementation, the cooling groove 230 can be a sealed channel that is sealed on all four sides and open at both ends.

[0076] During specific implementation, different types of focusing heaters 220 can also be selected according to the characteristics of the workpiece to be welded for matching. For example, a dot-shaped focusing heater can correspond to one welding position to be welded, and a strip-shaped focusing heater can correspond to a group of welding positions in the same row respectively, which can achieve welding more precisely and efficiently. For this purpose, in one example, the focusing heater 220 is a dot-shaped focusing heater, and each dot-shaped focusing heater corresponds to heating one welding position on the workpiece to be welded. In another example, the focusing heater 220 is a strip-shaped focusing heater, and the strip-shaped focusing heater corresponds to heating a group of welding positions in the same row on the workpiece to be welded. The strip-shaped focusing heater can simultaneously heat and weld two, three, four, five, six... ten or more solder joints.

[0077] The strip-shaped focusing heaters can be arranged parallel to the length direction of the solder strip 300, and one strip-shaped focusing heater can heat all the welding points on one solder strip 300 and the battery cell 400. Alternatively, the strip-shaped focusing heaters can be arranged perpendicular to the length direction of the solder strip 300, and one strip-shaped focusing heater can weld multiple parallelly placed solder strips 300 and the corresponding battery cells 400 together.

[0078] It should be noted that the linear focusing heater can reach full power in only 1 to 2 seconds by combining a near-infrared halogen lamp and a specially designed elliptical mirror. The maximum temperature of a single lamp can heat up to 800 °C. In addition, the elliptical mirror helps to focus the light on the line, and a specially made high-reflectivity gold-plated layer can be used to form the mirror, so as to achieve the fast heating effect of power saving and high efficiency.

[0079] In some embodiments, to prevent the focusing heater 220 from being damaged by mechanical contact during operation and to prevent foreign objects from entering, the lamp box body 210 has a concave space 240 and a protective glass 250 that closes the concave space 240. The focusing heater 220 is arranged in the concave space 240, and the light emitted by the focusing heater 220 is focused on the welding point of the workpiece to be welded after passing through the protective glass 250. In this way, the concave space 240 and the protective glass 250 can protect the focusing heater 220.

[0080] The implementation manners of the welding device 200 have been introduced in detail above. Combining with the welding device 200 described above, in the embodiment of the solar cell string welder, the welding device 200 directly and precisely heats and welds the welding tape 300 and the solar cell 400 into a solar cell string. The welding is uniform and stable, and it can avoid the deformation or other heat-induced effects of other unnecessary parts or components. Now, let's return to the embodiment of the solar cell string welder provided in this application and refer to Figure 1 as shown, and further describe the solar cell string welder.

[0081] In the embodiment of the solar cell string welder provided in this application, the conveying device 100 includes a conveyor belt 120 and a support heating plate 140, where: the conveyor belt 120 is sleeved on two sets of transmission rollers 110. Among them, the first set of transmission rollers 110 is a driving roller, and the second set of transmission rollers 110 is a driven roller. The conveyor belt 120 is supported by the two sets of transmission rollers 110 under the lamp box body 210, and the conveyor belt 120 receives the stacked welding tape 300 and solar cell 400 and is driven by the driving roller to convey the welding tape 300 and the solar cell 400; the support heating plate 140 is arranged under the conveyor belt 120, and a heating element (such as a heating thermocouple or a heating mesh) is arranged in the support heating plate 140. The support heating plate 140 heats the welding tape 300 and the solar cell 400 located on the conveyor belt 120 through the heat generated by the heating element, so as to increase the temperature of the welding tape 300 and the solar cell 400. Based on this structure, while heating with the focusing heater 220, the support heating plate 140 can be used for synchronous heating, so as to heat the upper and lower surfaces of the welding tape and the solar cell simultaneously, thus improving the heating efficiency.

[0082] In one implementation manner, the solar cell 400 and the welding tape 300 are stacked on the conveying device 100. Figure 2In the arrangement shown, one half of the solder tape 300 in the middle of the battery string is connected to the front side of the adjacent solar cell 400, and the other half of the solder tape 300 is connected to the back side of another adjacent solar cell 400. The solar cell 400 and the solder tape 300 are stacked on the conveying device 100, and it can also be as Figure 4 shown that the solder tape 300 is only connected to the back side of the solar cell 400. Specifically, the solder tape 300 can be below and the solar cell 400 can be above; or the solder tape 300 can be above and the solar cell 400 can be below.

[0083] The welding device 200 is used to weld the solar cell 400 and the solder tape 300 together. It can directly heat the connection part of the solar cell 400 and the solder tape 300 to connect the solar cell 400 and the solder tape 300 together; or it can heat the solar cell 400 and weld the solder tape 300 and the solar cell 400 together through the heat conduction of the solar cell 400.

[0084] It should be noted here that the above solar cell string welding machine includes the welding device described in the above embodiments and has the same beneficial effects as the above welding device embodiments, so no further description will be given. For the technical details not disclosed in the embodiments of the solar cell string welding machine of the present application, those skilled in the art can refer to the description of the welding device in the previous text. For the sake of saving space, no further description will be given here.

[0085] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0086] In the above description of the present application, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in the present application, those skilled in the art can understand the specific meanings of the above terms in the present application according to specific situations.

[0087] Based on the above description of the present application, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings of the present application. They are only for the purpose of facilitating the description of the solution of the present application and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present application.

[0088] In addition, the terms "first" or "second" etc. used in the present application to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

[0089] Although multiple embodiments of the present application have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided only by way of example. Those skilled in the art can think of many changes, alterations and alternative ways without departing from the spirit and idea of the present application. It should be understood that various alternative solutions to the embodiments of the present application described herein can be adopted in the process of practicing the present application. The appended claims are intended to define the protection scope of the present application and thus cover equivalents or alternatives within the scope of these claims.

Claims

1. A welding device, characterized in that: The welding device comprises: The light box body is arranged opposite to the battery string welding area, and the battery string welding area carries the parts to be welded, and the parts to be welded are the stacked welding strips and battery cells to be welded; A moving mechanism connected to the light box body, the moving mechanism can drive the light box body to move so as to adjust the distance between the light box body and the workpiece to be welded in at least one of a horizontal direction and a vertical direction; and, Multiple focusing heaters are arranged on the light box body, the multiple focusing heaters form at least two rows, each row includes multiple focusing heaters, there is a height difference between the focusing heaters in two adjacent rows, the focusing heaters with different heights are staggered in the horizontal direction, and the light emitted by the focusing heaters is focused on the welding point of the parts to be welded.

2. The welding device according to claim 1, characterized in that: Each of the focusing heaters is independently controlled, or each row of the focusing heaters is independently controlled, wherein the control includes controlling at least one of the start time, end time, start duration and working power of the focusing heater.

3. The welding device according to claim 1, characterized in that: The focusing heater includes a lamp holder and a light source. A focusing lampshade and an installation cavity for focusing the light emitted by the light source are provided in the light box body. The light source is installed on the light box body through the lamp holder, and the light source is located in the focusing lampshade. The focusing lampshade focuses the light emitted by the light source.

4. The welding device according to claim 3, characterized in that: The focusing heater further includes a sealing glass installed below the focusing lamp cover, wherein the sealing glass is configured to seal the focusing lamp cover.

5. The welding device according to claim 1, characterized in that: The welding device further comprises a cooling component, wherein the cooling component cools the focusing heater in the welding device; The welding device further comprises a temperature sensor, which is mounted on the light box body to sense the temperature inside the light box body.

6. The welding device according to claim 5, characterized in that: The cooling component comprises a cooling groove arranged on the light box body, and a cooling liquid flows in the cooling groove.

7. The welding device according to any one of claims 1 to 6, characterized in that: The focusing heater is a point focusing heater or a strip focusing heater, each point focusing heater corresponds to heating a welding position on the workpiece to be welded, and the strip focusing heater corresponds to heating a group of welding positions in the same row on the workpiece to be welded.

8. The welding device according to any one of claims 1 to 6, characterized in that: The light box body has a concave space and a protective glass that closes the concave space. The focusing heater is arranged in the concave space. The light emitted by the focusing heater passes through the protective glass and is focused to the welding position of the parts to be welded.

9. A battery cell string welding machine, characterized in that: The battery cell string welding machine comprises a battery cell feeding device, a welding ribbon feeding device, a conveying device, and a welding device as claimed in any one of claims 1 to 8; The battery cell loading device and the solder strip loading device stack the battery cells and solder strips onto the conveying device, the conveying device conveys the stacked solder strips and battery cells to the battery string welding area, and the welding device welds the solder strips and battery cells into a battery string.

10. The battery cell string welding machine according to claim 9, characterized in that: The conveying device comprises: A conveyor belt, supported by a driving roller and a driven roller and disposed below the light box body, wherein the conveyor belt receives the stacked solder strips and battery cells and is driven by the driving roller to convey the solder strips and battery cells; and, A supporting heating plate is arranged below the conveyor belt and is used for heating the welding strip and the battery cell carried by the conveyor belt.

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