A kind of stacked gate cell welding tool

Abstract

The utility model relates to photovoltaic technical field, concretely relates to a kind of stacked grid cell welding tool, including pressing plate subassembly, elastic connecting subassembly and frame subassembly.Pressing plate subassembly is made of multiple interval arrangement's wire pressing plate, forms openwork structure, and its contact side with cell is equipped with silica gel flexible contact structure;Elastic connecting subassembly contains mounting post and spring, mounting post one end is connected wire pressing plate, the other end is fixed by snap spring after passing frame subassembly, and the mounting post of adjacent wire pressing plate is staggered arrangement;Frame subassembly is the frame of middle part openwork, and both sides are equipped with magnetic attraction accessory.Welding tool is compressed spring by magnetic adsorption force, and pressure is evenly transmitted to wire pressing plate, realizes that conductive wire and cell are tightly pressed together;Openwork structure and staggered mounting post design, guarantee welding light transmission and flux discharge, improve welding yield, protect cell structure, adapt stacked grid cell mass production demand.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to a welding fixture for stacked grid cells. Background Technology

[0002] The bottleneck in the mass production of stacked-grid solar cells lies in the welding process between the conductive wires and the solar cells. The two winding schemes currently used in mainstream welding processes both have significant defects. Traditional cylindrical winding requires the solar cells to be forcibly pressed into an arc shape, which requires extremely high winding precision. Even small deviations can easily lead to welding misalignment. Moreover, the arc-shaped pressing will cause hidden stress in the solar cells, affecting structural stability and service life. Although the polygonal roller winding combined with UV glue pre-fixing process improves the arc-shaped pressing problem, the lack of dedicated pressing tooling leads to uneven contact pressure between the conductive wires and the solar cells during welding and loose pressing, resulting in low welding yield and degradation of battery electrical performance. At the same time, both processes lack suitable tooling structure design, making it difficult to solve the problem of flux residue, which can easily form an insulating layer, aggravating welding defects and increasing subsequent costs.

[0003] In view of this, in order to overcome the above-mentioned technical problems, this utility model designs and develops a welding fixture for stacked grid batteries, which solves the above-mentioned technical problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes a welding fixture for stacked grid cells, which solves the problem of low welding yield caused by poor bonding between conductive wires and cells and uneven pressure distribution during the welding process of existing stacked grid cells; it also solves the problem that rigid pressing in traditional processes can easily cause hidden stress and microcracks in cells, affecting the structural stability and service life of the module; at the same time, it solves the technical defects such as difficulty in removing flux residues during welding, uneven heat distribution leading to incomplete welding or electrical performance degradation, as well as poor fixture adaptability and complex operation, thus achieving efficient, stable and high-quality welding of conductive wires in stacked grid cells.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a welding fixture for stacked grid cells, including: a pressure plate assembly for pressing the cell sheets, an elastic connection assembly for realizing connection and buffering force transmission, and a frame assembly as the main body of the fixture. The pressure plate assembly consists of two or more pressure plates (1), with at least two adjacent pressure plates (1) having a gap between them to form a hollow structure for adapting to welding operations and auxiliary functions. The width of the hollow structure is greater than or equal to the width of the conductive wires on the battery cell (8). One end of the elastic connection assembly is connected to the pressure plate assembly, and the other end is connected to the frame assembly to achieve a movable connection between the two and provide a buffer elastic force. The frame assembly is provided with an assembly structure for installing the elastic connection assembly, and the frame assembly is configured with an adsorption structure for providing tooling positioning or fixing force.

[0006] As a preferred technical solution of this utility model, the side of the pressure plate assembly that contacts the battery cell (8) is provided with a flexible contact structure (6).

[0007] As a preferred embodiment of this utility model, the elastic connection assembly includes: a plurality of mounting posts and a spring, one end of the mounting post being connected to the pressure plate, and the other end passing through the frame assembly and being fixed by a snap ring; the spring is sleeved on the mounting post and located between the pressure plate assembly and the frame assembly.

[0008] As a preferred embodiment of this utility model, the mounting posts between two adjacent pressure plates are arranged in a staggered manner.

[0009] As a preferred technical solution of this utility model, the flexible contact structure is a flexible material component, and the coverage width of the flexible material component is greater than or equal to the distribution area width of the conductive wires on the battery cell.

[0010] As a preferred embodiment of this utility model, the frame component is a frame structure with a hollowed-out central portion; the assembly structure consists of mounting holes formed on the frame structure for mounting the elastic connection component.

[0011] As a preferred embodiment of this utility model, the adsorption structure is a magnetic adsorption element, and the number of magnetic adsorption elements is at least two, which are distributed along the axis of symmetry of the frame assembly.

[0012] As a preferred embodiment of this invention, the elastic force of the spring is less than the total adsorption force generated by the adsorption structure.

[0013] As a preferred technical solution of this utility model, the plurality of pressure plates are made of high-strength rigid materials, and the side or surface of the plurality of pressure plates that are in contact with the battery cells are coated with a high-temperature resistant insulating coating.

[0014] As a preferred embodiment of this utility model, the contact element made of flexible material is a silicone material element, and the width of the silicone material element is consistent with the width of the distribution area of ​​conductive wires on the battery cell.

[0015] In summary, this utility model has the following beneficial effects: Firstly, the flexible contact structure of the pressure plate assembly and the buffer force transmission design of the elastic connection assembly can evenly compress the conductive wires on the battery cell, ensuring that each conductive wire is tightly attached to the battery cell. This effectively solves the problems of welding misalignment and incomplete welding caused by uneven pressure in traditional processes, and significantly improves the welding yield.

[0016] Secondly, the buffer force provided by the flexible connection component avoids the impact of rigid pressing on brittle solar cells, reduces the generation of hidden stress and microcracks, ensures the structural stability of the solar cells, and extends the service life of photovoltaic modules.

[0017] Thirdly, the pressure plate assembly, through the hollow structure formed by multiple pressure plates arranged at intervals, provides ample channels for welding light, ensuring uniform heat distribution, and also allows for rapid discharge of flux, reducing the impact of residual insulation layer on electrical performance and lowering the risk of battery efficiency degradation.

[0018] Fourth, the adsorption structure of the frame components can quickly achieve tooling positioning and fixation, and the elastic design of the elastic connection components can adapt to battery cells of different thicknesses without complicated manual adjustment; the overall structure matches the process characteristics of stacked grid cells and can be directly connected to existing production lines, simplifying the operation process.

[0019] Fifth, the improved welding yield reduces rework and material waste, the universality of tooling reduces equipment modification investment, and the extended battery cell lifespan indirectly reduces later maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the welding fixture provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the welding fixture pressing provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the frame structure provided in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the pressure plate provided in an embodiment of the present utility model; Figure 5 This is provided by the embodiment of the present utility model. Figure 1 Enlarged view of point A in the middle.

[0022] In the diagram: 1. Pressure plate; 2. Mounting post; 3. Spring; 4. Snap ring; 5. Frame structure; 6. Flexible contact structure; 7. Magnetic adsorption component; 8. Battery cell. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0026] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. The term "width" as used below refers to the direction of extension of the conductive wire, that is, with the direction of extension of the conductive wire as the length direction, the direction perpendicular to the direction of extension of the conductive wire is the width direction. For example, the "width of the hollow structure" as described below refers to the distance between two endpoints or end lines in the hollow structure in a direction perpendicular to the extension direction of the conductive wire, regardless of the shape of the structure. That is, in the case of a long strip structure, if the long side of the structure is perpendicular to the extension direction of the conductive wire, then that long side direction is the width of the long strip structure. "Wide coverage of the flexible material component" refers to the distance between two end lines in the coverage area of ​​the flexible material component in a direction perpendicular to the extension direction of the conductive wire. "Width of the conductive wire arrangement on the battery cell" refers to the distance between the two outermost conductive wires in the conductive wire arrangement area in a direction perpendicular to the extension direction of the conductive wire. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figure 1-5 As shown, a stacked battery welding fixture includes: a pressure plate assembly for pressing the battery cells 8, an elastic connection assembly for achieving connection and buffering force transmission, and a frame assembly as the main body of the fixture. The side of the pressure plate assembly that contacts the battery cell 8 is provided with a flexible contact structure 6, and the pressure plate assembly has a hollow structure for adapting to welding operations and auxiliary functions; one end of the elastic connection assembly is connected to the pressure plate assembly, and the other end is connected to the frame assembly to realize the movable connection between the two and provide a buffer elastic force; the frame assembly is provided with an assembly structure for installing the elastic connection assembly, and the frame assembly is configured with an adsorption structure for providing tooling positioning or fixing force.

[0028] The pressure plate assembly consists of multiple pressure plates 1, which are arranged at intervals to form a hollow structure. The width of the hollow structure is greater than or equal to the width of the conductive wires on the battery cell 8.

[0029] The flexible connection assembly includes: multiple mounting posts 2 and springs 3. One end of the mounting post 2 is connected to the pressure plate 1, and the other end passes through the frame assembly and is fixed by a retaining spring 4. The spring 3 is sleeved on the mounting post 2 and is located between the pressure plate assembly and the frame assembly. The mounting posts 2 between two adjacent pressure plates 1 are staggered.

[0030] The flexible contact structure 6 is a flexible material component, and the width of the coverage area of ​​the flexible material component is greater than or equal to the width of the distribution area of ​​the conductive wires on the battery cell 8. The flexible material component can be a silicone strip or other materials. The flexible material component can be a single piece or a single strip of silicone, or it can be multiple silicone strips spliced ​​together in the horizontal or vertical direction, or multiple silicone strips can be spliced ​​together in an interlaced manner to form the coverage surface of the flexible material component.

[0031] The frame component is a frame structure 5, with a hollowed-out middle section; the assembly structure consists of mounting holes on the frame structure 5 for the installation of the flexible connection components.

[0032] The adsorption structure consists of magnetic adsorption elements 7, with at least two elements 7 distributed along the axis of symmetry of the frame assembly. The elastic force of the spring 3 is less than the total adsorption force generated by the adsorption structure.

[0033] Multiple pressure plates 1 are made of high-strength rigid material, and the side or surface of the multiple pressure plates 1 that contacts the battery cell 8 is coated with a high-temperature resistant insulating coating. The contact parts made of flexible material are made of silicone, and the width of the silicone parts is consistent with the width of the distribution area of ​​the conductive wires on the battery cell 8.

[0034] The working principle is as follows: The battery cell 8 to be welded (with the conductive wires pre-positioned) is placed on a magnetically adsorbable platform, ensuring that the conductive wire area on the battery cell 8 is facing upwards and flat. The entire fixture is attached to the platform by the magnetic adsorption component 7 on the frame assembly, achieving rapid positioning. At this time, the frame assembly is connected to the pressure plate assembly through the elastic connection component. The spring 3 in the elastic connection component is in a naturally extended state, and the pressure plate assembly is not yet in contact with the battery cell 8.

[0035] When the pressing action is initiated, the frame assembly moves towards the platform under the attraction of the magnetic adsorption component 7, causing the mounting posts 2 in the elastic connection assembly to move downwards synchronously until the flexible contact structure at the bottom of the pressure plate contacts the conductive wire area on the battery cell. Because the elastic force of the spring 3 is less than the total attraction force of the magnetic adsorption component 7, the frame assembly compresses the spring 3 during its downward movement, causing the spring 3 to generate a uniform reverse elastic force. This elastic force is transmitted through the mounting posts 2 to the multiple pressure plates 1 of the pressure plate assembly, causing the pressure plates 1 to apply pressure to the battery cell 8.

[0036] When the flexible contact structure 6 (silicone material) at the bottom of the pressure plate 1 contacts the conductive wire area on the battery cell 8, the flexible material, due to its width design adapted to the distribution area of ​​the conductive wires, can evenly wrap and compact all the conductive wires, ensuring that each conductive wire is tightly attached to the surface of the battery cell 8. It should be understood that the width refers to the distance between the two ends of the flexible material in a direction perpendicular to the extension direction of the conductive wire, and not necessarily the length of the shorter side of the rectangle. Simultaneously, the buffering effect of the spring 3 prevents damage to the battery cell 8 from rigid pressure and prevents the generation of latent stress.

[0037] In addition, such as Figure 1 As shown, by arranging multiple sets of elastic connection components, the pressure on each conductive wire is ensured to be even, avoiding local non-adhesion.

[0038] During the welding stage, the perforated structure formed by multiple pressure plates 1 arranged at intervals provides a direct channel for the infrared welding equipment's light to reach the welding area, ensuring uniform heat distribution. Simultaneously, the perforated structure allows for the rapid discharge of flux generated during welding, preventing residue from forming an insulating layer. The mounting posts 2 between adjacent pressure plates 1 are staggered to further reduce obstruction of light and flux flow.

[0039] After welding is completed, the magnetic attraction force is removed, and spring 3 returns to its natural state, causing the pressure plate assembly to separate from the battery cell 8, thus completing the entire welding process. Through the above structural cooperation, high-quality welding of the battery cell 8 and the conductive wire is achieved, while ensuring the structural integrity and electrical performance stability of the battery cell 8.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A welding fixture for stacked-grid batteries, characterized in that, include: The pressure plate assembly for pressing the solar cells (8), the elastic connection assembly for achieving connection and buffering force transmission, and the frame assembly as the main body of the tooling. The pressure plate assembly consists of two or more pressure plates (1), with at least two adjacent pressure plates (1) having a gap between them to form a hollow structure for adapting to welding operations and auxiliary functions. The width of the hollow structure is greater than or equal to the width of the conductive wires on the battery cell (8). One end of the elastic connection assembly is connected to the pressure plate assembly, and the other end is connected to the frame assembly to achieve a movable connection between the two and provide a buffer elastic force. The frame assembly is provided with an assembly structure for installing the elastic connection assembly, and the frame assembly is configured with an adsorption structure for providing tooling positioning or fixing force.

2. The welding fixture for stacked-grid batteries according to claim 1, characterized in that: The side of the pressure plate assembly that contacts the battery cell (8) is provided with a flexible contact structure (6).

3. The welding fixture for stacked-grid batteries according to claim 1, characterized in that: The elastic connection assembly includes: multiple mounting posts (2) and springs (3). One end of the mounting post (2) is connected to the pressure plate (1), and the other end passes through the frame assembly and is fixed by a snap ring (4). The spring (3) is sleeved on the mounting post (2) and is located between the pressure plate assembly and the frame assembly.

4. The welding fixture for stacked-grid batteries according to claim 3, characterized in that: The mounting posts (2) between two adjacent pressure plates (1) are staggered.

5. The welding fixture for stacked-grid batteries according to claim 2, characterized in that: The flexible contact structure (6) is a flexible material component, and the coverage width of the flexible material component is greater than or equal to the distribution area width of the conductive wires on the battery cell (8).

6. The welding fixture for stacked-grid batteries according to claim 1, characterized in that: The frame component is a frame structure (5), and the middle part of the frame structure (5) is hollow; the assembly structure is a mounting hole opened on the frame structure (5) for the installation of the elastic connection component.

7. The welding fixture for stacked-grid batteries according to claim 1, characterized in that: The adsorption structure is a magnetic adsorption element (7), and the number of magnetic adsorption elements (7) is at least two, and they are distributed along the axis of symmetry of the frame assembly.

8. The welding fixture for stacked-grid batteries according to claim 4, characterized in that: The elastic force of the spring (3) is less than the total adsorption force generated by the adsorption structure.

9. The welding fixture for stacked-grid batteries according to claim 2, characterized in that: The multiple pressure plates (1) are made of high-strength rigid material, and the side or surface of the multiple pressure plates (1) that contacts the battery cell (8) is coated with a high-temperature resistant insulating coating.

10. The welding fixture for stacked-grid batteries according to claim 5, characterized in that: The contact made of the flexible material is a silicone material, and the width of the silicone material is consistent with the width of the distribution area of ​​the conductive wires on the battery cell (8).

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