Welding device and battery piece series welding machine

Abstract

The invention discloses a welding device and a battery piece series welding machine, and belongs to the field of battery string manufacturing. The welding device comprises a welding lamp panel arranged above a battery string welding area, the welding lamp panel comprises a plurality of welding lamp modules with independent welding power, and lamp beads are distributed on each welding lamp module. The welding lamp panel is formed by the multiple welding lamp modules with the independent welding power, the welding power of each welding lamp module can be flexibly adjusted according to the distribution condition of the welding temperature, it is ensured that a to-be-welded part is evenly heated, and the welding consistency of the whole grid line of a battery piece is good.

Description

Technical Field

[0001] The present application relates to the field of solar cells, in particular to the field of cell string manufacturing. In particular, the present application relates to a welding device and a cell string welding machine for cell string welding. Background Art

[0002] A photovoltaic cell string is made by stacking the welding ribbons and cells in a predetermined order, and welding the welding ribbons to the main grid lines of the cells.

[0003] Currently, parallel infrared lamps are commonly used to heat and weld solar cells. However, the uneven temperature around the parallel lamps can lead to uneven surface temperature of the solar cells, resulting in cold or over-welding during string soldering. Furthermore, the uneven heat distribution and large temperature differences can lead to uneven and large deviations in the soldering adhesion between the solar cells and the solder ribbon. Invention content

[0004] The example of the present application provides a welding device and a battery cell string welding machine for battery cell string welding, which can achieve uniform heating and improve welding consistency.

[0005] On the one hand, an example of the present application provides a welding device, comprising: a welding light board arranged in a battery string welding area, the welding light board comprising a plurality of welding light modules with independent welding power, each welding light module being arranged with lamp beads.

[0006] The welding lamp board is composed of multiple welding lamp modules with independent welding power, which makes it easy to flexibly adjust the welding power of each welding lamp module according to the distribution of welding temperature, helping to ensure the even distribution of heat generated by the welding device, thereby improving the welding consistency of the battery cells.

[0007] According to some examples of the present application, the arrangement of the lamp beads includes: the lamp beads are distributed according to a first density in the central area of ​​the welding lamp module, and are distributed according to a second density on the periphery of the central area of ​​the welding lamp module; and / or, the lamp beads in the central area of ​​the welding lamp module have emitted light of a first wavelength, and the lamp beads on the periphery of the central area of ​​the welding lamp module have emitted light of a second wavelength.

[0008] By distributing the lamps at different densities in the center and periphery of the welding lamp module, the heat disparity between the two areas can be adjusted, thereby ensuring a uniform welding temperature distribution, thereby improving the welding consistency of the cell string. Furthermore, by distributing lamps with different emission wavelengths in the center and periphery of the welding lamp module, the heat disparity between the two areas can be adjusted, thereby ensuring a uniform welding temperature distribution.

[0009] According to some examples of the present application, the second density is greater than the first density, and the second wavelength is greater than the first wavelength.

[0010] The lamp beads on the welding lamp module are arranged so that the density of the lamp beads on the periphery of the central area is greater than that of the lamp beads in the central area. This prevents excessive heat generation in the central area and low heat generation in the periphery, helping to narrow the temperature gap between the central and peripheral areas, ensuring a more uniform welding temperature distribution. The wavelength of light emitted by the lamp beads on the periphery of the central area is greater than the wavelength of infrared light emitted by the lamp beads in the central area. This approach also improves the situation where the central area of ​​the welding lamp module generates excessive heat while the periphery generates low heat, narrowing the gap between the two and ensuring a more uniform heat generation from the welding lamp module, thereby ensuring a more uniform welding temperature distribution. This prevents cold or over-soldering, and ensures a highly consistent welding effect on the grid lines.

[0011] According to some examples of the present application, the lamp beads on each welding lamp module are evenly arranged, and the switching time of each welding lamp module is controlled independently of each other.

[0012] The welding lamp module, whose on / off times are independently controlled, can adjust the accumulated heat in each area according to the welding duration, thereby improving the previous problem of uneven heat.

[0013] According to some examples of the present application, the lamp beads are infrared lamp beads, and the infrared lamp beads are integrated with lenses, and the divergence angles of the lenses of all infrared lamp beads cover the battery string welding area.

[0014] By using a lens to disperse the light emitted by the lamp beads to cover the battery string welding area, it is possible to avoid excessive heat concentration and cause local excessive temperature.

[0015] According to some examples of the present application, the lamp beads are infrared lamp beads, and the infrared lamp beads are integrated with lenses with a divergence angle of 5-120 degrees.

[0016] The lens can be configured to diverge the emitted light to avoid local excessive temperature.

[0017] According to some examples of the present application, the welding device further includes a temperature measuring component, which is disposed on the welding lamp board and is used to detect the temperature of the welding lamp module.

[0018] The temperature measuring component can be used to monitor the temperature of the welding lamp module, which is convenient for timely regulation.

[0019] According to some examples of the present application, the welding device further includes a cooling component, which is disposed on a surface of the welding lamp board facing away from the infrared lamp beads.

[0020] The cooling components are used to dissipate heat from the welding lamp board to prevent heat accumulation and excessive temperature from affecting welding.

[0021] According to some examples of the present application, the cooling component includes a body, an inlet and an outlet arranged on the body, and multiple cooling channels arranged inside the body and connected to the inlet and the outlet, and the multiple cooling channels are distributed parallel to each other inside the body.

[0022] Multiple cooling channels distributed parallel to each other inside the body can ensure that the cooling medium flows quickly and achieves efficient heat dissipation.

[0023] According to some examples of the present application, a heat conductive material is filled between the cooling component and the welding lamp board.

[0024] The heat conductive material can promote heat conduction, and the welding light board has a good heat dissipation effect.

[0025] According to some examples of the present application, the cooling component further includes an adjustment structure, and the adjustment structure is used to adjust the flow rate of the cooling medium in the cooling component.

[0026] The adjustment structure can adjust the flow rate of the cooling medium so that the cooling components have different heat dissipation efficiencies, thereby regulating the flow rate of the cooling medium according to the real-time temperature of the welding lamp board, controlling the temperature inside the box, and ensuring the welding effect.

[0027] According to some examples of the present application, the welding device further includes a box body, the welding light panels are all arranged in the box body, and a shading plate for blocking the emitted light is provided in the box body along the outer periphery of the welding light panels.

[0028] By arranging the welding lamp panel in the box and arranging a shading plate on the periphery of the welding lamp panel, heat loss can be prevented and heat utilization efficiency can be improved.

[0029] According to some examples of the present application, the box includes an upper box located above the battery string welding area and provided with a welding light board, and a lower box located below the battery string welding area and provided with a shading plate. The upper box and the lower box cooperate to form a closed space, and the closed space has an inlet and an outlet for the parts to be welded to pass through.

[0030] By combining the upper and lower boxes to form a highly enclosed space, setting the welding light board in the upper box and setting a light shield under the battery string welding area, it can more effectively prevent the light emitted by the lamp beads from diffusing and affecting the battery cells to be welded or the battery cells that have been welded. At the same time, it can also avoid heat loss and improve heat utilization efficiency.

[0031] According to some examples of the present application, a protective glass is provided under the welding light panel.

[0032] The protective glass helps to protect the welding lamp module from mechanical damage.

[0033] According to some examples of the present application, the welding device further includes a ventilation component, which is communicated with the space between the welding light board and the protective glass.

[0034] The ventilation components can remove the waste gas, tiny particles, etc. generated during the welding process from the space between the welding lamp panel and the protective glass to avoid affecting the welding effect.

[0035] On the other hand, the present application also provides a battery cell string welding machine, which includes the above-mentioned welding device, as well as a battery cell loading device, a welding strip loading device, and a conveying device; the battery cell loading device and the welding strip loading device stack the battery cells and welding strips on the conveying device, the conveying device conveys the stacked welding strips and battery cells to the welding device, and the welding device welds the welding strips and battery cells into a battery string.

[0036] The cell string welding machine provided in the present application completes the loading of the soldering ribbon and the cell through the soldering ribbon loading device and the cell loading device, completes the conveying of the cell and soldering ribbon through the conveying device, and completes the welding of the cell string through the welding device. The welding device ensures that the soldering ribbon and the cell are heated evenly and stably during string welding, thereby improving the consistency of the welding between the cell string and the soldering ribbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] For a clearer explanation, the following briefly introduces the drawings required for the description.

[0038] Figure 1 This is a structural diagram of the welding lamp board in the first embodiment of this application;

[0039] Figure 2 For assembly Figure 1 Schematic diagram of the structure of the welding lamp module of the welding lamp board;

[0040] Figure 3 This is a structural diagram of a welding lamp board in the second embodiment of this application;

[0041] Figure 4 For assembly Figure 3 Schematic diagram of the structure of the welding lamp module of the welding lamp board;

[0042] Figure 5 This is a structural diagram of a welding lamp board in the third embodiment of this application;

[0043] Figure 6 This is a schematic structural diagram of the cooling component in an embodiment of the present application;

[0044] Figure 7 This is a schematic structural diagram of the AA section of the cooling component in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100-welding lamp board; 110-welding lamp module; 111-lamp beads;

[0047] 200 - cooling component; 210 - first inlet; 220 - first outlet; 230 - cooling channel. DETAILED DESCRIPTION

[0048] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0049] A strip of soldering ribbon is stacked on top of the battery cells, aligned with the main busbars of the cells, and then welded together to form a battery string. During string welding, the soldering ribbon and the main busbars of the cells are heated and welded together in the battery string welding area by a welding device, forming a fixed connection. Current heating welding generally relies on parallel lamps that heat the soldering ribbon and cells in the battery string welding area. However, heat dissipates around the lamps, resulting in uneven heating temperature. This leads to uneven welding temperature in the battery string welding area, which can easily cause cold joints or over-welding during string welding, seriously affecting the quality of the battery string.

[0050] In view of this, an embodiment of the present application provides a welding device that generates uniform heat, thereby ensuring uniform welding temperature in the battery string welding area, thereby ensuring uniform welding effect of the entire grid line of the battery cell.

[0051] Combine Figures 1 to 4 As shown, the welding device includes a welding light board 100, which is disposed in the battery string welding area so that the light generated by the welding light board 100 can radiate to the solar cells located in the battery string welding area, thereby heating the solar cells. The welding light board 100 includes multiple welding lamp modules 110 with independent welding power, and each welding lamp module 110 is equipped with lamp beads 111. As shown in the accompanying drawings, each welding lamp module 110 is equipped with a plurality of lamp beads 111. The welding light board 100 includes multiple such welding lamp modules 110, and the number of lamp beads 111 on each welding lamp module 110 can be the same or different.

[0052] In one implementation, a welding device can be placed above or below the cell string welding area to provide light heating to the cells in the welding area. Of course, to ensure faster heating or to heat both sides of the cells, welding devices can also be placed above and below the welding area. When the welding device is located below the welding area, the supporting component of the welding area needs to be light-transmissive. Specifically, a light-transmissive belt or light-transmissive tray can be used for the welding area.

[0053] In one implementation, the lamp beads 111 on each welding lamp module 110 are evenly arranged.

[0054] In one implementation, the lamp beads 111 of each welding lamp module 110 emit light with the same wavelength, and the wavelength is greater than 800 nm.

[0055] The embodiment of the present application comprises a welding lamp board 100 using a plurality of welding lamp modules 110 with independent welding power. When performing welding heating, the welding power of each welding lamp module 110 can be flexibly adjusted according to the distribution of the welding temperature, thereby ensuring that the light generated by the welding device is evenly distributed. This ensures that the temperature of the battery string welding area is uniform, and that the battery cell strings are welded with good consistency.

[0056] The following combination Figures 1 to 5 When further describing the specific implementation, the arrangement and distribution of the lamp beads 111 on the welding lamp module 110 can adopt one of the following methods.

[0057] In one implementation, combining Figures 1 to 4 As shown, the distribution surface of the lamp beads 111 of the welding lamp module 110 has a central area and a periphery surrounding the central area. The lamp beads 111 are distributed at a first density in the central area of ​​the welding lamp module 110 and at a second density around the periphery of the central area. The different densities of the lamp beads 111 in the central area and the periphery of the central area adjust the difference in heat generation between the periphery and the central area, helping to ensure uniform heating of the welding lamp module 110 and, in turn, uniform welding temperature distribution in the battery string welding area, resulting in more consistent battery string welding.

[0058] Furthermore, in one example, the second density is greater than the first density, which can prevent the welding lamp module 110 from having a situation where the central area generates too much heat while the peripheral area generates too little heat, thereby helping to narrow the temperature difference between the central area and the peripheral area, and ensuring a more uniform welding temperature distribution.

[0059] In one implementation, combining Figures 1 to 4As shown, the lamp bead distribution surface of the welding lamp module 110 has a central area and a periphery surrounding the central area. The lamp beads 111 in the central area of ​​the welding lamp module 110 emit light of a first wavelength, while the lamp beads 111 in the periphery of the central area of ​​the welding lamp module 110 emit light of a second wavelength. In this embodiment, by distributing lamp beads 111 with different emission wavelengths in the central area and the periphery of the central area of ​​the welding lamp module 110, the difference in heat generation between the periphery and the central area can be adjusted. This helps ensure uniform heating of the welding lamp module 110, and thus ensures a uniform welding temperature distribution in the battery string welding area, thereby improving the consistency of the welding adhesion between the battery cell and the welding ribbon.

[0060] Furthermore, in one example, the second wavelength is greater than the first wavelength. The longer the wavelength of the emitted light, the easier it is to be absorbed by the workpiece to be welded. This method can avoid the situation where the central area of ​​the welding lamp module 110 generates too much heat while the periphery generates less heat, narrowing the gap between the two, ensuring that the heat generated by the welding lamp module 110 is relatively uniform, thereby ensuring that the temperature of the battery string welding area is uniform, avoiding the occurrence of cold soldering or over-soldering when the battery cells are soldered in series, and the welding effect of the grid line has a high degree of consistency.

[0061] In one implementation, combining Figures 1 to 4 As shown, the distribution surface of the lamp beads 111 of the welding lamp module 110 has a central area and a periphery surrounding the central area. In this approach, the lamp beads 111 distributed at a first density in the central area of ​​the welding lamp module 110 are configured to emit light of a first wavelength, while the lamp beads 111 distributed at a second density outside the central area are configured to emit light of a second wavelength. It will be appreciated that this approach comprehensively considers both the distribution density and the wavelength of the light emitted by the lamp beads 111, thus achieving the benefits of the previously described approaches.

[0062] As one example of this implementation, the second density is greater than the first density. As another example of this implementation, the second wavelength is greater than the first wavelength. In specific implementations, embodiments in which the second density is greater than the first density and the second wavelength is greater than the first wavelength may also be selected. These implementations can prevent and improve the situation where the central area of ​​the welding lamp module 110 generates excessive heat while the peripheral area generates less heat, narrowing the gap between the two. This ensures that the heat generated by the welding lamp module 110 is relatively uniform, thereby ensuring a uniform surface temperature of the cell cells in the cell string welding area. This prevents cold or over-welding during cell string welding, and ensures a high degree of consistency in the grid wire welding results.

[0063] In one implementation, combining Figure 5As shown, in this implementation, the lamp beads 111 of each welding lamp module 110 are evenly distributed, and the on / off timing of each welding lamp module 110 is independently controlled. For example, each welding lamp module 110 has an independent power supply circuit, and the operating time of each welding lamp module 110 can be independently controlled by turning the power supply circuit on and off. Different operating times result in different cumulative heat generated by the lamp beads 111 of each welding lamp module 110. Therefore, this approach can adjust the cumulative heat generation of each area based on the welding duration, thereby improving the problem of uneven heat generation.

[0064] The above mainly discusses the arrangement and layout of the lamp beads 111 on the welding lamp module 110. Now, the following turns to the description of the structural form of the lamp beads 111.

[0065] Combine Figures 1 to 5 As shown, in some embodiments, the lamp bead 111 is an infrared lamp bead that can emit infrared light.

[0066] In one implementation, the infrared lamp beads have the function of emitting light with a wavelength of 800nm. The battery cell absorbs the light emitted by the infrared lamp beads and is heated. Therefore, the infrared lamp beads can complete the welding of the battery cell and the soldering strip. In addition, the infrared lamp beads are integrated with lenses. The lenses are directly packaged (or bonded) on the infrared lamp beads and become a whole with the infrared lamp beads. The lens improves the light output efficiency of the infrared lamp beads and changes the light field distribution of the emitted light. The divergence angle of the lens of all infrared lamp beads covers the battery string welding area. With the help of the lens, the emitted light of the lamp bead 111 is diverged to cover the battery string welding area, which can avoid excessive heat concentration and cause local excessive temperature.

[0067] Combine Figures 1 to 5 As shown, in other embodiments, the lamp bead 111 is the infrared lamp bead described above, and the infrared lamp bead is integrated with a lens with a divergence angle of 5-120 degrees. The lens can be configured to diverge the emitted light and then radiate it to the battery string welding area to avoid local excessive temperature. In addition, during specific implementation, the lamp bead 111 that is close to the battery string welding area is configured with a lens with a larger divergence angle, for example, a lens with a divergence angle of 100 degrees, 108 degrees, 110 degrees, 116 degrees, and 120 degrees, while the lamp bead 111 that is far from the battery string welding area is configured with a lens with a smaller divergence angle, for example, a lens with a divergence angle of 5 degrees, 18 degrees, 20 degrees, 26 degrees, 32 degrees, 36 degrees, and 45 degrees, so as to avoid the heat generated by the emitted light from being too concentrated in the battery string welding area.

[0068] In one implementation, a suitable lamp bead 111 can also be selected according to the distance between the welding device and the workpiece to be welded. If the welding device is relatively close to the workpiece to be welded when working, a lens with a divergence angle of 100 degrees, 108 degrees, 110 degrees, 116 degrees, or 120 degrees can be selected. If the welding device is far away from the workpiece to be welded when working, a lens with a divergence angle of 5 degrees, 18 degrees, 20 degrees, 26 degrees, 32 degrees, 36 degrees, or 45 degrees can be selected.

[0069] Next, we turn to the description of other structural components of the welding device.

[0070] In some embodiments, the welding device may further include a temperature measuring component, which is disposed on the welding lamp board 100 and is used to detect the temperature of the welding lamp module 110. The temperature measuring component can be used to monitor the temperature of the welding lamp module 110 for timely adjustment. In a specific implementation, the temperature measuring component may be a thermistor, a thermocouple, or an infrared probe.

[0071] See also Figure 6 and Figure 7 As shown, in some embodiments, the welding device may further include a cooling component 200, which is arranged on the surface of the welding lamp board 100 facing away from the infrared lamp beads and forms face-to-face contact with the surface. The welding lamp board 100 dissipates heat through the cooling component 200 through this contact, preventing heat accumulation from causing the temperature of the welding lamp board 100 to be too high, thereby affecting the battery string welding.

[0072] Exemplarily, the cooling component 200 includes a body, a first inlet 210 and a first outlet 220 disposed on the body, and a plurality of cooling channels 230 disposed within the body and connected to the first inlet 210 and the first outlet 220. The plurality of cooling channels 230 are distributed parallel to each other within the body. The cooling medium can flow more quickly through the plurality of cooling channels 230 distributed parallel to each other within the body, thereby achieving efficient heat dissipation.

[0073] To promote heat conduction and ensure effective heat dissipation from the welding light board 100, a thermally conductive material is placed between the cooling element 200 and the welding light board 100. For example, the thermally conductive material can be thermally conductive silicone grease or a thermal pad formed by curing the thermally conductive silicone grease. The thermally conductive material ensures full contact between the welding light board 100 and the cooling element 200, enhancing heat dissipation.

[0074] According to some examples of the present application, the cooling component 200 may further include a regulating structure for adjusting the flow rate of the cooling medium in the cooling component 200. The regulating structure may be a pump, a solenoid valve, or the like.

[0075] The adjustment structure can adjust the flow rate of the cooling medium so that the cooling component 200 has different heat dissipation efficiency, thereby adjusting the flow rate of the cooling medium according to the real-time temperature of the welding lamp board 100, controlling the temperature of the welding lamp board 100, and then adjusting the welding temperature of the battery string welding area to ensure the welding effect.

[0076] According to some examples of the present application, the welding device further includes a housing, wherein the welding lamp panels 100 are disposed within the housing, and within the housing, a light shielding plate is disposed along the periphery of the welding lamp panels 100 to block the emitted light. The light shielding plate is perpendicular to the surface on which the lamp beads of the welding lamp module 110 are distributed, and the light shielding plate disposed along the periphery of the welding lamp panel 100 encloses and separates the welding lamp panel 100 from the space on the other side of the light shielding plate. By disposing the welding lamp panel 100 within the housing and disposing the light shielding plate on the periphery of the welding lamp panel 100, the light emitted by the lamp beads 111 can be prevented from diffusing and affecting the cells to be welded or already welded, while also preventing heat loss and improving heat utilization efficiency.

[0077] According to some examples of the present application, the box body includes an upper box body and a lower box body, wherein the upper box body is located above the battery string welding area and is provided with a welding light board 100, and the lower box body is located below the battery string welding area and is provided with a shading plate. The shading plate can be set below the battery string welding area. The upper box body and the lower box body cooperate to form a higher enclosed space. The enclosed space has a second inlet and a second outlet for the parts to be welded to pass through. With the help of the upper box body and the lower box body, a higher enclosed space is formed, the welding light board 100 is set in the upper box body, and a shading plate is set below the battery string welding area. This can more effectively prevent the light emitted by the lamp beads 111 from diffusing and affecting the battery cells to be welded or the battery cells that have been welded. At the same time, it can also avoid heat loss and improve heat utilization efficiency.

[0078] According to some examples of the present application, in order to prevent the welding lamp module 110 from being mechanically damaged, a protective glass is provided under the welding lamp board 100. Exemplarily, the protective glass is quartz glass.

[0079] According to some embodiments of the present application, the welding apparatus further includes a ventilation component that communicates with the space between the welding light board 100 and the protective glass. The ventilation component may include an exhaust component or an air blowing component. The ventilation component removes exhaust gas and fine particulate matter generated during welding from the space between the welding light board 100 and the protective glass, thereby preventing any degradation in welding performance.

[0080] On the other hand, an embodiment of the present application also provides a battery cell string welding machine, which includes the above-mentioned welding device, as well as a battery cell loading device, a welding strip loading device and a conveying device; the battery cell loading device and the welding strip loading device stack the battery cells and welding strips on the conveying device, the conveying device conveys the stacked welding strips and battery cells to the welding device, and the welding device welds the welding strips and battery cells into a battery string.

[0081] In one implementation, the battery cell loading device includes a robot arm equipped with a suction cup for adsorbing the battery cells; the solder strip loading device includes a mobile servo module equipped with a chuck for clamping the solder strip, and the mobile module drives the chuck to move to the conveying device to place the solder strip; the welding device welds the solder strip and the battery cells into a battery string.

[0082] In one implementation, the mobile servo module is driven by a motor, and the chuck is driven by a cylinder.

[0083] The battery cell string welding machine provided in the embodiment of the present application completes the loading of the welding ribbon and the battery cell through the welding ribbon loading device and the battery cell loading device, completes the transportation of the battery cell and the welding ribbon through the conveying device, and completes the welding of the battery string through the welding device. The welding device ensures that the welding ribbon and the battery cell are evenly and stably heated when the battery cell is welded in string, thereby improving the consistency of the welding between the battery string and the welding ribbon.

[0084] In the above description of this application, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood in a broad sense. For example, with respect to the term "connected," it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements. Therefore, unless otherwise expressly specified in this application, those skilled in the art can understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0085] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0086] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0087] Although a number of embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may devise numerous modifications, variations, and alternatives without departing from the concept and spirit of the present invention. It should be understood that in practicing the present invention, various alternatives to the embodiments of the present invention described herein may be employed. The appended claims are intended to define the scope of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A welding device, characterized in that: include: A welding lamp board is provided in the battery string welding area, wherein the welding lamp board includes a plurality of welding lamp modules with independent welding powers, and each welding lamp module is provided with lamp beads.

2. The welding device according to claim 1, characterized in that The arrangement of the lamp beads includes: The lamp beads are distributed at a first density in the central area of ​​the welding lamp module and at a second density around the central area of ​​the welding lamp module; and / or the lamp beads in the central area of ​​the welding lamp module have emitted light of a first wavelength, and the lamp beads around the central area of ​​the welding lamp module have emitted light of a second wavelength.

3. The welding device according to claim 2, characterized in that The second density is greater than the first density, and the second wavelength is greater than the first wavelength.

4. The welding device according to claim 1, characterized in that The lamp beads on each welding lamp module are evenly arranged, and the switching time of each welding lamp module is controlled independently of each other.

5. The welding device according to claim 1, characterized in that The lamp beads are infrared lamp beads, and the infrared lamp beads are integrated with lenses. The divergence angles of the lenses of all infrared lamp beads cover the battery string welding area.

6. The welding device according to claim 1, characterized in that The lamp beads are infrared lamp beads, and the infrared lamp beads are integrated with lenses with a divergence angle of 5-120 degrees.

7. The welding device according to claim 1, characterized in that The welding device further includes a temperature measuring component, which is disposed on the welding lamp board and is used to detect the temperature of the welding lamp module.

8. The welding device according to claim 1, characterized in that The welding device further includes a cooling component, which is arranged on a surface of the welding lamp board facing away from the lamp beads.

9. The welding device according to claim 8, characterized in that The cooling component includes a body, a first inlet and a first outlet provided on the body, and a plurality of cooling channels provided inside the body and connected to the first inlet and the first outlet. The plurality of cooling channels are distributed parallel to each other inside the body.

10. The welding device according to claim 8, characterized in that A heat conducting material is filled between the cooling component and the welding lamp board.

11. The welding device according to claim 8, characterized in that The cooling component further includes an adjusting structure, and the adjusting structure is used to adjust the flow rate of the cooling medium in the cooling component.

12. The welding device according to claim 1, characterized in that The welding device further comprises a box body, the welding lamp panels are all arranged in the box body, and a light shielding plate for shielding the emitted light is arranged in the box body along the outer periphery of the welding lamp panels.

13. The welding device according to claim 12, characterized in that The box body includes an upper box body located above the battery string welding area and provided with the welding light board, and a lower box body located below the battery string welding area and provided with the shading plate. The upper box body and the lower box body cooperate to form a closed space, and the closed space has a second inlet and a second outlet for the passage of the parts to be welded.

14. The welding device according to claim 1, characterized in that A protective glass is provided below the welding lamp panel.

15. The welding device according to claim 14, characterized in that The welding device further includes a ventilation component, which is communicated with the space between the welding lamp board and the protective glass.

16. A battery cell string welding machine, characterized in that: The cell string welding machine comprises a welding device according to any one of claims 1 to 15, a cell loading device, a welding ribbon loading device, and a conveying device; The cell loading device and the soldering strip loading device stack the cell and soldering strip on the conveying device, and the conveying device conveys the stacked soldering strip and cell to the welding device, and the welding device welds the soldering strip and cell into a cell string.

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