Solder strip

Abstract

The utility model discloses a solder strip, which is applied to the field of photovoltaic power generation and comprises a lap joint part and a connecting part. The lap joint part extends outwards along the two opposite sides to exceed the connecting part, so that the cross section of the welding strip is integrally T-shaped; the lap joint part is used for being lapped on the surface of insulation paste on two sides of a main grid of the battery; the connecting part is used for being welded with a main grid of the battery; the connecting part is provided with a side surface which obliquely extends outwards; and the side surface of the connecting part is an inclined surface matched with the side part of the insulating paste. According to the utility model, the lap joint part extends outwards along the two opposite sides to exceed the connecting part, so that the cross section of the welding strip is integrally T-shaped, the connecting part is used for being welded with a main grid of a battery, and the connecting part is provided with the side surface which extends outwards in an inclined manner; the side surface of the connecting part is the inclined surface matched with the side part of the insulating paste, so that the matching between the welding strip and the arranged insulating paste is improved, the structural strength of the welding strip structure is improved, and the stability of the structure is improved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic power generation, in particular to a welding strip. Background Art

[0002] The difference between BC (full back electrode contact) cells and traditional crystalline silicon photovoltaic cells is that the positive and negative electrodes of BC cells are both located on the back of the cell, increasing the light-collecting contact area on the front of the cell, thereby improving the absorption efficiency of incident light. However, the positive and negative electrodes are located on the same surface, and it is necessary to print insulating glue on the negative sub-grids on both sides of the positive main grid, or on the positive sub-grids on both sides of the negative main grid, to avoid short circuits caused by overlapping contact between the positive and negative electrodes during welding.

[0003] In the existing printed insulating adhesive solution, the main grid area of ​​the battery will be much lower than the height of the insulating adhesive on both sides. During welding, the solder ribbon is easily overlapped on the insulating adhesive, resulting in poor overlap between the solder ribbon and the battery PAD (contact point). Therefore, solder paste is introduced to assist in welding to increase the PAD height in disguise and improve the welding effect. However, this increases the amount of solder paste used and the preparation cost. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a solder strip, which solves the problem that when introducing solder paste to assist soldering in the prior art to increase the PAD height in disguise and improve the welding effect, the amount of solder paste used increases, which leads to increased preparation costs.

[0005] In order to solve the above technical problems, the utility model provides a welding strip, comprising an overlapping portion and a connecting portion;

[0006] The overlapping portion extends outwardly along two sides of the alignment and exceeds the connecting portion, so that the cross section of the welding strip is T-shaped as a whole;

[0007] The overlapping portion is used to overlap the surface of the insulating glue on both sides of the main grid of the battery; the connecting portion is used to be welded to the main grid of the battery;

[0008] The connecting portion is formed with a side surface extending outwardly in an inclined manner; the side surface of the connecting portion is an inclined surface matched with the side portion of the insulating glue.

[0009] Optionally, the inclined surface of the connecting portion is an inclined surface symmetrically arranged on both sides of the connecting portion.

[0010] Optionally, the angle formed by the inclined surface and the surface of the battery cell is 25 degrees to 65 degrees.

[0011] Optionally, the thickness of the tin-containing layer on the surface of the connecting portion welded to the main grid of the back contact battery is greater than the thickness of the tin-containing layer on the remaining surface of the welding strip.

[0012] Optionally, the tin-containing layer on the surface of the connecting portion welded to the main grid of the back contact battery has a thickness of 10 micrometers to 30 micrometers.

[0013] Optionally, the overlapping portion and the connecting portion are an integrally formed structure.

[0014] Optionally, the width of the overlapping portion at the insulating glue surface on both sides of the main grid of the back contact battery is 75 microns to 225 microns;

[0015] The thickness of the overlapping portion is 100 micrometers to 150 micrometers.

[0016] Optionally, both side surfaces corresponding to the connecting portion and the side portion of the insulating adhesive are side surfaces whose entire side surfaces extend outwardly in an inclined manner.

[0017] Optionally, the overlapping portion extends outwardly in its entirety to overlap the surface of the insulating glue on both sides of the main grid of the back contact battery.

[0018] Optionally, the connecting portion and the overlapping portion are overlapped at the lower surface of the insulating glue, and the corner formed is an arc corner.

[0019] It can be seen that the welding strip provided by the utility model includes an overlapping portion and a connecting portion; the overlapping portion extends outwardly beyond the connecting portion along the two sides of the alignment, so that the cross-section of the welding strip is T-shaped as a whole; the overlapping portion is used to overlap the surface of the insulating glue on both sides of the main grid of the battery; the connecting portion is used to be welded to the main grid of the battery; the connecting portion is formed with a side surface extending outwardly obliquely; the side surface of the connecting portion is an inclined surface that matches the side portion of the insulating glue. The utility model sets the overlapping portion to extend outwardly beyond the connecting portion along the two sides of the alignment, so that the cross-section of the welding strip is T-shaped as a whole, the connecting portion is used to be welded to the main grid of the battery, the connecting portion is formed with a side surface extending outwardly obliquely, and the side surface of the connecting portion is an inclined surface that matches the side portion of the insulating glue, which improves the adaptability of the welding strip to the set insulating glue, and at the same time improves the structural strength of the welding strip structure and improves the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the cross-sectional structure of a welding strip provided in an embodiment of the utility model;

[0022] Figure 2A schematic diagram of a cross-sectional structure of a welding strip connected to a battery provided in an embodiment of the utility model;

[0023] Figure 3 A schematic cross-sectional structure diagram of another welding strip provided in an embodiment of the utility model;

[0024] Figure 4 A schematic cross-sectional structure diagram of another welding strip provided in an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of a cross-sectional structure of another welding strip provided in an embodiment of the utility model;

[0026] Figures 1 to 5 In the figure, the reference numerals are described as follows:

[0027] 1- soldering tape, 2- insulating glue, 3- battery;

[0028] 10-overlapping portion, 11-structure of the overlapping portion extending outwardly along both sides of the overlapping portion and beyond the connecting portion, 20-connecting portion, 21-inclined surface, 22-arc-shaped corner, 30-tin-containing layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Embodiment 1:

[0031] Please refer to Figure 1 , Figure 1 The cross-sectional structure diagram of a welding strip provided in an embodiment of the utility model. The welding strip provided in this embodiment includes an overlapping portion 10 and a connecting portion 20;

[0032] The overlapping portion 10 extends outwardly beyond the connecting portion 20 along the two sides of the alignment, so that the cross section of the welding strip 1 is T-shaped as a whole;

[0033] The overlapping portion 10 is used to overlap the surface of the insulating glue 2 on both sides of the main grid of the battery 3; the connecting portion 20 is used to be welded to the main grid of the battery 3;

[0034] The connecting portion 20 is formed with a side surface extending outwardly in an inclined manner; the side surface of the connecting portion 20 is a slope 21 that matches the side of the insulating glue 2 .

[0035] It should be noted that in this embodiment, the welding strip 1 is a welding strip with a T-shaped cross section along a cross section perpendicular to the extension direction of the welding strip, and at least the welding strip corresponding to the area where the insulating glue 2 is prepared on both sides of the battery main grid area has a T-shaped cross section along the cross section perpendicular to the extension direction of the welding strip, and the above welding strip 1 is composed of a transverse structure and a vertical structure, the two ends of the transverse structure are free ends, and the vertical structure is connected to the transverse structure at one end in the vertical direction, and the other end is a free end facing the transverse structure, that is, a T-shaped structure is formed, corresponding to this embodiment, the lap portion 10 constituting the welding strip 1 is the above-mentioned transverse structure, and the connecting portion 20 constituting the welding strip 1 is the above-mentioned vertical structure. In addition, in this embodiment, the lap portion 10 extends outwards beyond the connecting portion 20 along the two sides of the alignment, so that the cross section of the welding strip 1 is T-shaped as a whole. Because the T-shaped structure in this embodiment is a cross-sectional shape formed along a cross section perpendicular to the extension direction of the welding strip, the lap portion 10 in this embodiment extends outwards beyond the connecting portion 20 along the two sides of the alignment, that is, it extends beyond the connecting portion 20 along the two sides perpendicular to the extension direction of the welding strip. In this embodiment, the overlapping portion extends outwardly along the two sides of the alignment beyond the structure 11 of the connecting portion, and is used to overlap the surface of the insulating glue 2. In this embodiment, the insulating glue 2 is formed on both sides of the battery main grid area. For details, please refer to Figure 2 , Figure 2 A schematic cross-sectional structure diagram of a welding strip connected to a battery provided in an embodiment of the utility model.

[0036] In a feasible embodiment, the welding strip can be used for laying in a back-contact battery, and the positive and negative electrodes of the back-contact battery are located on the same side of the battery cell 3, and the sub-grids of different polarities are alternately formed on the surface of the battery cell 3, and the main grid is generally arranged to be laid vertically between multiple sub-grids of the same polarity. Specifically applied to back-contact batteries, when the main grid is laid continuously, the sub-grid with a polarity different from the main grid is disconnected at the main grid position to avoid short circuit of the component, and further to avoid misconnection between the disconnected sub-grid and the main grid, it is necessary to set insulating glue 2 at the disconnected sub-grids on both sides of the main grid, and the structure 11 of the above-mentioned overlapping portion extending outward along both sides of the alignment beyond the connecting portion is overlapped on the insulating glue 2.

[0037] In this embodiment, after the insulating glue 2 is prepared on both sides of the battery main grid area, since the insulating glue 2 has a certain thickness, it will form a height difference with the surface of the battery cell 3. The insulating glue 2 is generally prepared by direct dispensing, and the colloid is solidified from the molten state to form a stable insulating glue 2 during preparation. Therefore, under the influence of surface tension, the side of the insulating glue 2 will form an inclined surface structure after molding. Therefore, the surface area of ​​the connecting part 20 that is connected with the side of the insulating glue 2 is set as a slope 21. On the one hand, the stability of the connection between the side of the connecting part 20 and the side of the insulating glue 2 is achieved. On the other hand, by setting the side of the connecting part 20 as an inclined surface, the stability of the welding strip 1 structure is improved.

[0038] By providing the above-mentioned solder strip 1, this embodiment does not need to lay solder paste in the battery main grid area. In order to facilitate the stable connection between the solder strip and the surface of the battery cell 3, a tin-containing layer is generally provided in the solder strip. For example, a layer of tin-lead-bismuth alloy is generally provided on the surface of the solder strip, wherein the bismuth content can be set between 10% and 40%, and the melting temperature is 130 degrees Celsius. It should be noted that the solder strip 1 in this embodiment includes solder strips of various shapes similar to the T-shaped structure, and simple variants of the conventional T-shaped structure also fall within the scope of protection of this application. For example, the lap joint 10 can be set to a trapezoidal structure or a parallelogram structure that does not affect the structure of the T-shaped main body. In addition, it should be further noted that when the insulating glue 2 is prepared on only one side of the battery main grid area, the lap joint 10 can also be correspondingly set to extend outward beyond the connecting portion 20 only on one side of the insulating glue 2. At this time, the corresponding shape of the solder strip is close to an L-shaped structure. It should be further explained that the existing battery main grid width can accommodate 0.3 mm to 0.7 mm welding strips, while the design width of the flat welding strip is between 0.7 mm and 1.5 mm, resulting in unstable connection and low contact area between the welding strip and the battery main grid. This embodiment does not limit the specific material of the insulating glue 2. For example, the insulating glue 2 of the epoxy resin system can be used, which can be prepared by thermal curing, UV curing (UV curing is a technology that uses ultraviolet radiation to induce a specific material to quickly change from liquid to solid), etc., and the printing length can be set to 2 mm, the width to 1 mm, and the thickness to 30 microns to 45 microns.

[0039] Furthermore, in order to improve the preparation efficiency of the welding strip and the stability of the structure, the overlapping portion 10 and the connecting portion 20 may be provided as an integrally formed structure.

[0040] It should be noted that in this embodiment, the overlapping portion 10 and the connecting portion 20 in the above-mentioned welding strip 1 are set as an integrally formed structure, which improves the preparation efficiency of the welding strip 1. At the same time, the integrally formed welding strip 1 ensures the stability of the welding strip 1 structure.

[0041] Furthermore, in order to ensure the adaptability of the cross-sectional structure of the welding strip 1, the width of the overlapping portion 10 overlapping the surface of the insulating glue 2 on both sides of the main grid of the back contact battery can be set to 75 microns to 225 microns;

[0042] The thickness of the overlapping portion 10 is 100 micrometers to 150 micrometers.

[0043] It should be noted that in this embodiment, the width of the overlapping portion 10 at the surface of the insulating glue 2 on both sides of the main grid of the back contact battery is set to 75 microns to 225 microns, and the thickness of the overlapping portion 10 is set to 100 microns to 150 microns. When the shape of the battery main grid area is fixed, the cross-section of the welding strip 1 in this embodiment is guaranteed to be compatible with the cross-section of the conventional welding strip, so that the resistance of the welding strip 1 in this embodiment is compatible with the conventional welding strip, thereby ensuring the adaptability of the welding strip 1.

[0044] Furthermore, in order to improve the convenience of preparing the T-shaped welding strip 1, the two side surfaces corresponding to the side of the connecting portion 20 and the insulating adhesive 2 are both side surfaces that extend outwardly in an inclined manner.

[0045] It should be noted that, in this embodiment, the entire side surface of the connecting portion 20 where the surface area corresponding to the side portion of the insulating glue 2 is located is set as a side surface in which the entire side surface extends outwardly, and the entire surface forms an inclined surface 21 with an acute angle with the surface of the battery cell 3. Instead of only setting the surface area corresponding to the side portion of the connecting portion 20 and the insulating glue 2 as the inclined surface 21, the side surface of the connecting portion 20 can be processed on the entire surface, thereby improving the ease of preparation.

[0046] Furthermore, in order to improve the convenience of preparing the T-shaped welding strip 1, the overlapping portion 10 is extended outwardly on the entire side to overlap the surface of the insulating glue 2 on both sides of the main grid of the back contact battery.

[0047] It should be noted that in this embodiment, the overlapping portion 10 is arranged to extend outward on the entire side to overlap the surface of the insulating glue 2 on both sides of the main grid of the back contact battery, rather than only extending the overlapping portion 10 outward in the area corresponding to the insulating glue 2, which further reduces the complexity of the preparation of the welding strip 1 and improves the efficiency of the preparation of the welding strip 1.

[0048] The welding strip provided by the embodiment of the utility model comprises a lap part 10 and a connecting part 20; the lap part 10 extends outwardly beyond the connecting part 20 along the two sides of the alignment, so that the cross section of the welding strip 1 is T-shaped as a whole; the lap part 10 is used to overlap the surface of the insulating glue 2 on both sides of the main grid of the battery 3; the connecting part 20 is used to be welded to the main grid of the battery; the connecting part 20 is formed with a side surface extending outwardly obliquely; the side surface of the connecting part 20 is an inclined surface 21 that matches the side of the insulating glue 2. The utility model sets the lap part 10 to extend outwardly beyond the connecting part 20 along the two sides of the alignment, so that the cross section of the welding strip 1 is T-shaped as a whole, the connecting part 20 is used to be welded to the main grid of the battery, the connecting part 20 is formed with a side surface extending outwardly obliquely, and the side surface of the connecting part 20 is an inclined surface 21 that matches the side of the insulating glue 2, which improves the adaptation of the welding strip 1 to the set insulating glue 2, and at the same time improves the structural strength of the welding strip 1 and improves the stability of the structure.

[0049] In addition, the embodiment of the utility model improves the preparation efficiency of the solder strip 1 by setting the overlapping portion 10 and the connecting portion 20 in the above-mentioned solder strip 1 as an integrally formed structure, and at the same time, the integrally formed solder strip 1 ensures the stability of the solder strip 1 structure; the width of the overlapping portion 10 at the surface of the insulating glue 2 on both sides of the main grid of the back contact battery is set to 75 microns to 225 microns, and the thickness of the overlapping portion 10 is set to 100 microns to 150 microns, which ensures the adaptability of the solder strip 1 when the shape of the battery main grid area is fixed; the entire side surface where the surface area corresponding to the side portion of the insulating glue 2 in the connecting portion 20 is located is set to be a side surface extending outwardly with the entire side surface inclined, so that the side surface of the connecting portion 20 can be processed as a whole, thereby improving the ease of preparation; the overlapping portion 10 is set to extend outward on the entire side to overlap the surface of the insulating glue 2 on both sides of the main grid of the back contact battery, which further reduces the complexity of the preparation of the solder strip 1 and further improves the efficiency of the preparation of the solder strip 1.

[0050] Embodiment 2:

[0051] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the cross-sectional structure of another soldering tape provided in an embodiment of the utility model. Compared with the soldering tape provided in embodiment 1, the difference between the soldering tape provided in this embodiment and embodiment 1 is that:

[0052] The inclined surface 21 of the connecting portion 20 is symmetrically arranged on both sides of the connecting portion 20 .

[0053] It should be noted that in this embodiment, the connecting portion 20 is arranged as two symmetrical inclined surfaces 21 on the two side surfaces, which, on the one hand, ensures the regularity of the structure and facilitates laying; on the other hand, reduces the complexity of preparation and facilitates the molding of the welding strip 1.

[0054] Furthermore, in order to ensure that the two inclined surfaces 21 of the connecting portion 20 in the welding ribbon 1 can effectively improve the stability of the structure, the angle formed by the inclined surfaces 21 and the surface of the battery cell 3 can be set to 25 degrees to 65 degrees.

[0055] In this embodiment, the inclined surface 21 of the connecting portion 20 is specifically set to have an angle of 25 to 65 degrees with the surface of the battery cell 3 , which can effectively improve the structural strength of the welding ribbon 1 .

[0056] The solder strip provided by the embodiment of the utility model is applied, by setting the connection part 20 as the inclined surfaces 21 on the two sides, and setting them as two symmetrical inclined surfaces 21, on the one hand, the regularity of the structure is ensured, which is convenient for laying, and on the other hand, the complexity of preparation is reduced, which is more convenient for molding the solder strip 1. In addition, the embodiment of the utility model can effectively improve the structural strength of the solder strip 1 by setting the inclined surface 21 of the connection part 20 to have an angle of 25 degrees to 65 degrees with the surface of the battery cell 3.

[0057] Embodiment 3:

[0058] Please refer to Figure 4 , Figure 4 A schematic diagram of the cross-sectional structure of another welding strip provided in an embodiment of the utility model. The welding strip provided in this embodiment is different from that in embodiment 1 in that:

[0059] The thickness of the tin-containing layer 30 on the surface of the connection portion 20 welded to the main grid of the back contact battery is greater than the thickness of the tin-containing layer 30 on the remaining surface of the welding strip 1 .

[0060] It should be noted that in this embodiment, the thickness of the tin-containing layer 30 provided on the surface where the connection portion 20 is welded to the main grid of the back contact battery is set to be greater than the thickness of the tin-containing layer 30 on the remaining surface of the welding strip 1. Under the condition of ensuring the cost, the tin-containing layer 30 can be used to assist the welding strip 1 in connecting with the battery cell 3, and effectively improve the stability of the connection between the welding strip 1 and the battery cell 3. This embodiment does not limit the specific material of the tin-containing layer 30 in the welding strip 1, for example, it can be set to a tin-lead-bismuth alloy layer.

[0061] Furthermore, in order to ensure that the welding strip 1 is firmly connected to the battery cell 3, the thickness of the tin-containing layer 30 on the surface of the connection portion 20 welded to the main grid of the back contact battery can be set to 10 microns to 30 microns.

[0062] It should be noted that in this embodiment, the thickness of the tin-containing layer 30 on the surface where the connection portion 20 is welded to the main grid of the back contact battery is set to 10 microns to 30 microns, which can ensure that the welding strip 1 is effectively connected to the surface of the battery cell 3.

[0063] By using the soldering strip provided in the embodiment of the utility model, the thickness of the tin-containing layer 30 provided on the surface where the connection portion 20 is welded to the main grid of the back contact battery is set to be greater than the thickness of the tin-containing layer 30 on the remaining surface of the soldering strip 1, so that the stability of the connection between the soldering strip 1 and the battery cell 3 can be effectively improved while ensuring the cost. In addition, by setting the thickness of the tin-containing layer 30 on the surface where the connection portion 20 is welded to the main grid of the back contact battery to 10 microns to 30 microns, the embodiment of the utility model can ensure that the soldering strip 1 is stably and effectively connected to the surface of the battery cell 3.

[0064] Embodiment 4:

[0065] Please refer to Figure 5 , Figure 5 The cross-sectional structure diagram of another welding strip provided in the embodiment of the utility model. Compared with the welding strip provided in the embodiment 1, the difference is that:

[0066] The connecting portion 20 overlaps the overlapping portion 10 at the lower surface of the insulating adhesive 2 , and the corner formed is an arc-shaped corner 22 .

[0067] It should be noted that, in the present embodiment, the overlapping portion 10 in the soldering strip 1 extends outwardly beyond the connecting portion 20 to form a structure 11 in which the overlapping portion extends outwardly beyond the connecting portion along both sides of the alignment, and the bottom surface of the structure 11 in which the overlapping portion extends outwardly beyond the connecting portion along both sides of the alignment forms a corner with the side surface of the connecting portion 20 to accommodate the insulating glue 2 during installation. In order to avoid the problem of stress accumulation of the insulating glue 2 at the corner and to avoid delamination resulting in an unstable connection between the insulating glue 2 and the soldering strip 1, the above-mentioned corner is set to an arc corner 22, which effectively solves the problem of stress accumulation of the insulating glue 2 at the corner, effectively improves the stability of the connection between the soldering strip 1 and the insulating glue 2, and thus improves the overall component yield.

[0068] By applying the soldering strip provided in the embodiment of the utility model, the corner formed by overlapping the connecting portion 20 and the overlapping portion 10 between the lower surface of the insulating adhesive 2 is set as an arc corner 22, which solves the problem of stress accumulation at the corner of the insulating adhesive 2, improves the stability of the connection between the soldering strip 1 and the insulating adhesive 2, and thus improves the yield of the overall component.

[0069] In a possible embodiment, the welding strip in the present application may specifically include an overlapping portion and a connecting portion;

[0070] The overlapping portion extends outwardly along both sides of the alignment beyond the connecting portion, so that the cross section of the welding strip is T-shaped as a whole, and the overlapping portion extends outwardly on the entire side to overlap the surface of the insulating glue on both sides of the main grid of the back contact battery; the connecting portion is used to be welded to the main grid of the battery;

[0071] The connecting portion is formed with a side surface extending outwardly in an inclined manner; the side surface of the connecting portion is an inclined surface matched with the side portion of the insulating glue; the inclined surface of the connecting portion is an inclined surface symmetrically arranged on both sides of the connecting portion; the angle formed by the inclined surface and the surface of the battery cell is 25 degrees to 65 degrees;

[0072] The thickness of the tin-containing layer on the surface of the connection portion welded to the main grid of the back contact battery is greater than the thickness of the tin-containing layer on the remaining surface of the welding strip, and the thickness of the tin-containing layer on the surface of the connection portion welded to the main grid of the back contact battery is 10 microns to 30 microns;

[0073] The overlapped portion and the connecting portion are an integrally formed structure; the width of the overlapped portion at the insulating adhesive surface on both sides of the main grid of the back contact battery is 75 microns to 225 microns; the thickness of the overlapped portion is 100 microns to 150 microns;

[0074] The connecting portion and the overlapping portion are overlapped between the lower surfaces of the insulating glue, and the formed corner is an arc corner.

[0075] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0076] In addition, it should be noted that, in this article, relationships such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants are intended to cover non-exclusive inclusions.

[0077] The above is a detailed introduction to a welding strip provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the structure and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A welding strip, characterized in that: including overlapping parts and connecting parts; The overlapping portion extends outwardly along two sides of the alignment and exceeds the connecting portion, so that the cross section of the welding strip is T-shaped as a whole; The overlapping portion is used to overlap the surface of the insulating glue on both sides of the main grid of the battery; the connecting portion is used to be welded to the main grid of the battery; The connecting portion is formed with a side surface extending outwardly in an inclined manner; the side surface of the connecting portion is an inclined surface matched with the side portion of the insulating glue.

2. The welding strip according to claim 1, characterized in that: The inclined surface of the connecting portion is symmetrically arranged on both sides of the connecting portion.

3. The welding strip according to claim 1, characterized in that: The angle formed by the inclined surface and the surface of the battery cell is 25 degrees to 65 degrees.

4. The welding strip according to claim 1, characterized in that: The thickness of the tin-containing layer on the surface of the connection portion welded to the main grid of the back contact battery is greater than the thickness of the tin-containing layer on the remaining surface of the welding strip.

5. The welding strip according to claim 4, characterized in that: The tin-containing layer on the surface of the connecting portion welded to the main grid of the back contact battery has a thickness of 10 to 30 microns.

6. The welding strip according to claim 1, characterized in that: The overlapping portion and the connecting portion are an integrally formed structure.

7. The welding strip according to claim 1, characterized in that: The width of the overlapping portion at the insulating adhesive surface on both sides of the main grid of the back contact battery is 75 microns to 225 microns; The thickness of the overlapping portion is 100 micrometers to 150 micrometers.

8. The welding strip according to claim 1, characterized in that: The two side surfaces of the connecting portion corresponding to the side portion of the insulating adhesive are both side surfaces whose entire side surfaces extend outwardly in an inclined manner.

9. The welding strip according to claim 1, characterized in that: The overlapping portion extends outwardly in its entirety to overlap the surface of the insulating glue on both sides of the main grid of the back contact battery.

10. The welding strip according to any one of claims 1 to 9, characterized in that: The connecting portion and the overlapping portion are overlapped at the lower surface of the insulating glue, and the corner formed is an arc corner.

Images