Battery piece assembly

Abstract

The utility model provides a battery piece assembly which comprises a battery piece and a plurality of welding strips, two side surfaces of the battery piece are provided with fine auxiliary grid lines, and the welding strips are arranged in parallel at intervals. The first section is electrically connected with the thin auxiliary grid lines on the first side face of the battery piece, the second section extends out of the first side face and is used for being electrically connected with the thin auxiliary grid lines on the second side face of another battery piece arranged adjacent to the first section, and the two ends of the first section are fixedly connected with the battery piece through glue points. According to the utility model, the two ends of the first section are respectively provided with the glue points, so that the first section can be kept in a straightened state, and the position of the welding strip is kept unchanged when the welding spot of the welding strip is secondarily fused due to overhigh local temperature of a hot spot effect in the use process of the corresponding photovoltaic module plate; ohmic contact between the welding strips and the fine auxiliary grid lines is further maintained, the aging speed of the photovoltaic module panel is effectively delayed, and the service life of the battery string is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic component processing, in particular to a battery sheet component. Background Art

[0002] A photovoltaic module is composed of multiple battery strings interconnected by bus bars, and a battery string is composed of multiple battery cells interconnected by welding ribbons. When the photovoltaic module is used in the later stage, the influence of the obstruction on the surface of the battery cell will cause the local temperature of the battery cell to rise. This temperature rise will melt the welding ribbon and the film layer welded on the surface of the battery cell. Since the melted film is fluid, the welding ribbon may be separated from the surface of the battery cell after melting. When this abnormal temperature returns to normal, the welding ribbon and the film layer will re-solidify. At this time, the solidified welding ribbon may be separated from the fine grid lines on the surface of the battery cell or the contact effect may deteriorate, which may easily lead to an increase in transmission resistance and a reduction in the actual photoelectric conversion efficiency. Therefore, a measure is urgently needed to ensure that the welding ribbon maintains good contact with the grid lines on the surface of the battery cell when the temperature of the photovoltaic module is abnormal, so as to achieve the technical effect of extending the service life of the photovoltaic module. Utility Model Content

[0003] The battery cell assembly designed in the present invention can at least partially solve the above problems.

[0004] The utility model aims to provide a battery cell assembly, comprising a battery cell and a plurality of welding strips, wherein both side surfaces of the battery cell are provided with fine auxiliary grid lines, and each of the welding strips is arranged in parallel and at intervals, and the welding strip comprises a first section electrically connected to the fine auxiliary grid line on the first side surface of the battery cell and a second section extending out of the first side surface for electrically connecting to the fine auxiliary grid line on the second side surface of another battery cell arranged adjacent thereto, and both ends of the first section are fixedly connected to the battery cell by glue points.

[0005] In some embodiments, the glue dots are formed by curing a heat-curing glue.

[0006] In some embodiments, the glue dots are formed by curing a light-curing glue.

[0007] In some embodiments, the light-curing adhesive is UV adhesive.

[0008] In some embodiments, the glue point covers a side of the soldering ribbon facing away from the battery cell so that a connection is formed between the soldering ribbon and the first side surface of the battery cell.

[0009] In some embodiments, the battery cell assembly further includes a solder strip protection strip, which covers the side of the solder strip facing away from the battery cell and is glued to the battery cell, and the solder strip protection strip is located in the area between the glue points at both ends of the first section.

[0010] In some embodiments, the solder strip protection adhesive strip is an EVA adhesive film.

[0011] In some embodiments, a gap between an end of the solder tape protection strip and a corresponding glue point between two glue points at two ends of the first section is δ, 1 mm ≤ δ ≤ 3 mm.

[0012] In some embodiments, at least one of the glue spots is further disposed on the welding strip between the two glue spots at both ends of the first section.

[0013] In some embodiments, the heat-resistant temperature of the glue point is higher than the melting point of the solder strip.

[0014] The battery cell assembly of the utility model:

[0015] By setting glue points at both ends of the first section, the first section can be kept in a straightened state. When the solder joints of the soldering ribbons are melted for the second time due to the hot spot effect and the local temperature is too high during use of the corresponding photovoltaic module panels, even if the connection points (i.e., solder joints) between the soldering ribbons and the corresponding thin auxiliary grid lines are melted for the second time and lose their connection strength, the soldering ribbons will not change position due to the positioning effect of the glue points at both ends, thereby maintaining ohmic contact between the soldering ribbons and the thin auxiliary grid lines, effectively slowing down the aging speed of the photovoltaic module panels and increasing the service life of the battery strings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a battery cell assembly according to an embodiment of the utility model (showing the first side surface of the battery cell).

[0017] Figure 2 It is a three-dimensional structural schematic diagram of a battery cell assembly according to another embodiment of the utility model (showing the first side surface of the battery cell).

[0018] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0019] In the figure:

[0020] 1. Battery cell; 2. Solder ribbon; 21. First section; 22. Second section; 3. Glue point; 4. Solder ribbon protective tape. DETAILED DESCRIPTION

[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed description will be omitted.

[0022] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0023] The following example is a battery cell assembly of the utility model. This example is only a part of the embodiments of the utility model, but the protection scope of the utility model is not limited to this. All other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the utility model.

[0024] Please refer to Figures 1 to 3 According to an embodiment of the present invention, a battery cell assembly is provided. Figure 1 As shown, it includes a battery cell 1 and a plurality of welding strips 2, and the two side surfaces of the battery cell 1 have fine auxiliary grid lines (not shown in the figure), and the welding strips 2 are arranged in parallel and spaced apart, and the welding strips 2 include a first section 21 electrically connected to the fine auxiliary grid lines on the first side surface of the battery cell 1 and a second section 22 extending out of the first side surface for electrically connecting to the fine auxiliary grid lines on the second side surface of another battery cell (not shown in the figure) arranged adjacent thereto, and both ends of the first section 21 are fixedly connected to the battery cell 1 by glue points 3, and the heat-resistant temperature of the glue points 3 is higher than the melting point of the welding strips 2, and the electrical connection between the aforementioned welding strips 2 and the fine auxiliary grid lines can be a welding connection, for example, it is achieved by laminating and melting after the batteries are strung together, and the welding strips 2 are electrically connected to all the fine auxiliary grids on the battery cell 1. In specific implementation, the aforementioned glue points 3 are specifically glued at corresponding positions by a glue dispensing device and then subsequent curing operations are performed according to the curing characteristics of the colloid.

[0025] In this technical solution, glue points 3 are respectively provided at both ends of the first section 21 so that the first section 21 can be kept in a straightened state. When the corresponding photovoltaic module panel is in use and the local temperature is too high due to the hot spot effect, resulting in secondary melting of the solder joints of the soldering ribbon, even if the connection points (i.e., solder joints) between the soldering ribbon 2 and the corresponding thin auxiliary grid lines are melted for the second time and lose the connection strength, the soldering ribbon 2 will not change position due to the positioning effect of the glue points 3 at both ends, thereby maintaining the ohmic contact between the soldering ribbon 2 and the thin auxiliary grid lines, effectively delaying the aging speed of the photovoltaic module panel and increasing the service life of the battery string. It should be noted that the heat resistance temperature of the aforementioned glue point 3 being higher than the melting point of the solder strip 2 is only a basic requirement. Theoretically, the heat resistance temperature of the glue point 3 should preferably be no lower than the maximum value of the local temperature when the hot spot effect occurs during use of the battery cell, so as to ensure that the glue point 3 can reliably straighten the fixed solder strip 2. In actual application, based on the material selection of the glue point 3 and cost considerations, it is sufficient to select a curing glue with a heat resistance temperature higher than the melting point of the solder strip 2, which can meet the straightening and positioning requirements of the secondary molten solder strip in most cases.

[0026] In a specific embodiment, the glue dots 3 are formed by curing with a thermosetting adhesive. The aforementioned thermosetting adhesive can specifically be a thermosetting resin commonly used on the market, such as epoxy resin, unsaturated polyester resin, phenolic resin, polyurethane, etc. The heat resistance temperature of these thermosetting resins can generally reach above 100°C. According to actual needs, a thermosetting resin with a heat resistance temperature of not less than 150°C, such as epoxy resin, can be further selected.

[0027] In another specific embodiment, the glue dots 3 are formed by curing with a photocuring glue. The photocuring glue can specifically be UV glue (also known as ultraviolet curing glue) commonly used on the market, which has a thermal decomposition temperature, that is, a heat resistance temperature, of up to 250°C-300°C, has high thermal stability, and can significantly reduce manufacturing costs.

[0028] In some embodiments, the glue dot 3 covers the side of the soldering tape 2 facing away from the battery cell 1 so that a connection is formed between the soldering tape 2 and the first side of the battery cell 1, that is, the glue of the glue dot 3 will not be clamped between the soldering tape 2 and the battery cell 1, thereby ensuring that the soldering tape 2 and the aforementioned thin auxiliary grid line are reliably electrically connected while positioning and straightening the two ends of the soldering tape 2.

[0029] In some embodiments, the battery cell assembly further includes a solder strip protection adhesive strip 4, the solder strip protection adhesive strip 4 covers the side of the solder strip 2 away from the battery cell 1 and is glued to the battery cell 1, and the solder strip protection adhesive strip 4 is located in the area between the adhesive points 3 at both ends of the first section 21. The aforementioned solder strip protection adhesive strip 4 has a plurality of strips corresponding to each solder strip 2 in one achievable manner, and in another achievable manner, it can be an integral adhesive film, that is, a single adhesive film is used to simultaneously cover and position all solder strips 2 on one side of the same battery cell. Of course, it can also be a single adhesive strip that simultaneously covers multiple solder strips 2, and there is no special limitation at this time. The aforementioned solder strip protection adhesive strip 4 can specifically be an EVA adhesive film, and preferably, its melting point should also be higher than the melting point of the solder strip 2. The aforementioned EVA film can be solidified on the surface of the battery cell by a certain degree of hot melting. The hot melting method can be a hot air gun or infrared heating of the battery cell. When the aforementioned glue point adopts a thermosetting glue, the hot melting of the glue point and the aforementioned solder strip protection strip 4 can be carried out simultaneously, thereby simplifying the preparation process.

[0030] In this technical solution, the solder strip section between the two glue points 3 is covered and pasted on the surface of the battery cell 1 by means of the solder strip protection adhesive strip 4. On the one hand, the reliability of the ohmic contact between the solder strip 2 and the thin auxiliary grid line can be further improved. On the other hand, during the use of the photovoltaic module panel, the filling film layer between the battery string and the glass plate is melted under the hot spot effect and directly contacts the solder strip 2 with force, causing the position of the solder strip 2 to change, that is, it plays the role of protecting the solder strip and further reduces the probability of the position change of the solder strip 2.

[0031] In some embodiments, the gap between the end of the solder strip protection strip 4 between the two glue spots 3 at both ends of the first section 21 and the corresponding glue spot 3 is δ, 1mm≤δ≤3mm, which can prevent the glue spot 3 from being too far away from the end of the solder strip protection strip 4, causing the colloid to overflow to the covering position of the solder strip protection strip 4 during glue dispensing, and at the same time prevent the glue spot 3 from being too far away from the end of the solder strip protection strip 4, resulting in a smaller coverage area of ​​the solder strip protection strip 4 on the solder strip 2.

[0032] In some embodiments, at least one glue point 3 is further disposed on the soldering tape 2 between the two glue points 3 at both ends of the first section 21 , so as to achieve the purpose of multi-point straightening and positioning of the soldering tape 2 by the glue points 3 .

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cell assembly, comprising a cell (1) and a plurality of welding strips (2), wherein both sides of the cell (1) are provided with thin secondary grid lines, and each of the welding strips (2) is arranged in parallel and at intervals, characterized in that: The welding strip (2) comprises a first section (21) electrically connected to a thin auxiliary grid line on a first side surface of a battery cell (1) and a second section (22) extending outside the first side surface for electrically connecting to a thin auxiliary grid line on a second side surface of another battery cell arranged adjacent thereto, wherein both ends of the first section (21) are fixedly connected to the battery cell (1) via glue points (3).

2. The battery cell assembly according to claim 1, characterized in that: The glue dots (3) are formed by curing the thermally curable glue.

3. The battery cell assembly according to claim 1, characterized in that: The glue dots (3) are formed by curing light-curing glue.

4. The battery cell assembly according to claim 3, characterized in that: The light-curing adhesive is UV adhesive.

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that: The glue point (3) covers the side of the welding strip (2) facing away from the battery cell (1) so that a connection is formed between the welding strip (2) and the first side surface of the battery cell (1).

6. The battery cell assembly according to any one of claims 1 to 5, characterized in that: It also includes a solder strip protection adhesive strip (4), which covers the side of the solder strip (2) facing away from the battery cell (1) and is glued to the battery cell (1), and the solder strip protection adhesive strip (4) is located in the area between the adhesive points (3) at both ends of the first section (21).

7. The battery cell assembly according to claim 6, characterized in that: The soldering ribbon protective adhesive strip (4) is an EVA adhesive film.

8. The battery cell assembly according to claim 6, characterized in that: The gap between the end of the solder strip protection rubber strip (4) between the two glue spots (3) at the two ends of the first section (21) and the corresponding glue spot (3) is δ, 1mm≤δ≤3mm.

9. The battery cell assembly according to claim 1, characterized in that: At least one glue point (3) is further provided on the welding strip (2) between the two glue points (3) at the two ends of the first section (21).

10. The battery cell assembly according to claim 1, characterized in that: The heat-resistant temperature of the glue point (3) is higher than the melting point of the welding strip (2).

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