Battery Pad point structure and imbricated battery

Abstract

The utility model provides a battery Pad point structure and an imbricated battery, relates to the technical field of solar battery pieces, the Pad point structure comprises a rectangular main body and a zigzag structure arranged at the edge of the rectangular main body, and solves the problems that the conventional Pad point design in the prior art causes the waste of conductive adhesive, large series resistance of components, high power loss, low cost and the like. Therefore, the technical effects of improving the utilization rate of the conductive adhesive, improving the conductivity, reducing the contact resistance between pieces and further improving the power of the laminated tile assembly are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell sheets, in particular to a battery Pad point structure and a shingled battery. Background Art

[0002] As a clean energy, solar energy is an endless energy source and has attracted much attention for its development prospects. With the advancement of photovoltaic technology, the conversion efficiency of solar cells is constantly improving, and its component technology is also being continuously optimized.

[0003] At present, shingled modules are used as a relatively advanced module technology. The cells using shingled modules are called shingled cells. Different from conventional modules that use welding ribbons to connect the cells in series, shingled modules use conductive glue to connect the cells in series. More cells can be placed in modules of the same size, making the module more powerful.

[0004] However, the stacked cells are connected by conductive glue, which is greatly affected by the area of ​​the silver pad point of the cell. At present, the pad point is usually designed as a regular rectangle. In the actual stacking process, a large amount of conductive glue will not be used, which is not conducive to improving the power of the module. Therefore, it is necessary to optimize the stacking pad point design. Utility Model Content

[0005] The purpose of the utility model is to provide a battery Pad point structure and a shingled battery to solve the technical problems of waste of conductive glue, large component series resistance, high power loss and low component power in conventional Pad points in the prior art.

[0006] In a first aspect, the battery Pad point structure provided by the utility model includes a rectangular body and a sawtooth structure arranged on the edge of the rectangular body.

[0007] Furthermore, the length of the teeth of the serrated structure on the wide side of the rectangular body is 10% to 50% of the length of the wide side.

[0008] Furthermore, the length of the teeth of the serrated structure on the wide side of the rectangular body is 25% to 35% of the length of the wide side.

[0009] Furthermore, the ratio of the virtual to real spacing of the sawtooth structure on the wide side of the rectangular body is 1:2 to 2:1.

[0010] Furthermore, the length of the sawtooth structure on the long side of the rectangular body is 5% to 20% of the length of the long side.

[0011] Furthermore, the length of the sawtooth structure on the long side of the rectangular body is 10% to 15% of the length of the long side.

[0012] Furthermore, the ratio of the virtual to real spacing of the sawtooth structure on the long side of the rectangular body is 1:2 to 2:1.

[0013] Furthermore, the aspect ratio of the rectangular body is 6:1 to 2:1.

[0014] Furthermore, the length of the rectangular body is 1 mm to 3 mm;

[0015] The width of the rectangular body is 0.2 mm to 1 mm.

[0016] In a second aspect, a shingled battery comprises the Pad point structure described in any one of the above items.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] Compared with the conventional Pad point design of a regular rectangular structure, the battery Pad point structure provided by the utility model further adds a serrated structure on the edge of the rectangular structure. The serrated design can improve the utilization rate of the conductive adhesive and improve the conductivity without increasing the silver paste consumption of the Pad point, thereby reducing the contact resistance between sheets and improving the power of the shingled component.

[0019] The shingled battery provided by the utility model can increase the power by 0.5% to 0.7% compared with the conventional shingled battery. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 It is a schematic diagram of the structure of a conventional Pad point in the prior art;

[0022] Figure 2 A schematic diagram of the structure of Pad point optimization provided by one embodiment of the utility model;

[0023] Figure 3 A front design drawing of a single strip graphic of a shingled battery provided in one embodiment of the utility model;

[0024] Figure 4 A back design drawing of a single strip graphic of a shingled battery provided in one embodiment of the utility model;

[0025] Figure 5A schematic diagram of the front / back pad points being connected and conducted through conductive adhesive provided by one embodiment of the utility model;

[0026] Figure 6 This is a laminated X-ray photo of the conventional Pad point obtained in the test example;

[0027] Figure 7 This is an X-ray photograph of the stacked sheets with optimized Pad points obtained in the test example.

[0028] Icons: 1-pad point; 2-main grid line; 3-thin grid line; 4-conductive glue connection point; 101-rectangular body; 102-serrated structure; 1011-wide side; 1012-long side. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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] The shingled module is affected by the position and size of the battery stack. The regular rectangular design of the conventional pad point will cause waste of conductive glue and increase the series resistance of the module, resulting in high power loss of the module and low power of the module. In order to solve this technical problem, the utility model is specially proposed.

[0031] According to a first aspect of the utility model, a battery Pad point structure is provided, comprising a rectangular body and a sawtooth structure arranged on the edge of the rectangular body.

[0032] The conventional pad point design is a regular rectangular structure (see Figure 1 ) compared to the present invention, the battery pad point design is optimized, and a sawtooth structure is further added to the edge of the rectangular structure (see Figure 2 ), that is, a serrated structure 102 is added to the wide side 1011 and the long side 1012 of the rectangular body 101. The serrated design can improve the utilization rate of the conductive adhesive and the conductivity without increasing the silver paste consumption of the pad point, thereby reducing the contact resistance between the sheets and improving the power of the shingled battery.

[0033] The shingled assembly structure requires that a portion of the battery strips be overlapped. The utility model adds a serrated structure on the long side of the rectangular body, and the length of the serrations is relatively short, in order to reduce the overlapping area and increase the illuminated area; and adds a serrated structure on the wide side of the rectangular body, and the length of the serrations is relatively long, in order to increase the overlapping area and thereby increase the conductive area.

[0034] In a preferred embodiment, the sawtooth length of the serrated structure on the wide side of the rectangular body can be 10% to 50% of the length of the wide side. Typical but non-limiting sawtooth lengths are, for example, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, and 50%, and may be further preferably 25% to 35%.

[0035] In a preferred embodiment, the ratio of the virtual to real sawtooth spacing of the sawtooth structure on the wide side of the rectangular body can be 1:2 to 2:1, for example, 1:2, 1:1.5, 1:1, 1.5:1, 2:1, but not limited thereto.

[0036] It should be noted that the virtual-to-real ratio refers to the ratio of the distance between the saw teeth to the saw tooth width. For example, if the virtual-to-real ratio is 1:1, it means that the distance between the saw teeth and the saw tooth width are consistent.

[0037] In a preferred embodiment, the sawtooth length of the serrated structure on the long side of the rectangular body can be 5% to 20% of the length of the long side. Typical but non-limiting sawtooth lengths are, for example, 5%, 10%, 15%, and 20%, and can be further preferably 10% to 15%.

[0038] In a preferred embodiment, the ratio of the virtual to real sawtooth spacing of the sawtooth structure on the long side of the rectangular body can be 1:2 to 2:1, for example, 1:2, 1:1.5, 1:1, 1.5:1, 2:1, but not limited thereto.

[0039] In the present invention, the area of ​​the non-serrated portion in the Pad point region can account for more than 50% of the total area, which is more conducive to ensuring the adhesion of the overlapping area.

[0040] In summary, the pad point of the utility model can effectively improve the utilization rate of the conductive adhesive without increasing the silver paste consumption through a specific sawtooth structure design, significantly reduce the contact resistance between sheets, and can increase the power of the shingled component by 0.5% to 0.7%.

[0041] It should be noted that a serrated structure can be provided on 2, 3 or 4 sides of the rectangular body according to actual conditions; among them, providing long serrations on the wide side of the rectangular body is an important means to achieve the technical effect. The reason is that the conductive adhesive will become a circle or an ellipse after lamination and pressing. If only short serrations are provided on the long side of the rectangular body, the conductive adhesive cannot be fully utilized, resulting in a poor power enhancement effect of the shingled module. In addition, if only short serrations are provided on the long side of the rectangular body, in order to achieve the purpose of enhancing the power of the module, it is necessary to extend the length of the serrations, which will increase the lamination area and lead to a decrease in the power of the shingled module.

[0042] In a preferred embodiment, the aspect ratio of the rectangular body may be 6:1 to 2:1, for example, 6:1, 5:1, 4:1, 3:1, 2:1, but not limited thereto.

[0043] In a preferred embodiment, the length of the rectangular body can be 1mm to 3mm, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, but not limited to this; the width of the rectangular body can be 0.2mm to 1mm, for example, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, but not limited to this.

[0044] According to a second aspect of the utility model, a shingled battery is provided, comprising the Pad point structure described in any one of the above items.

[0045] The shingled battery provided by the utility model can increase the power by 0.5% to 0.7% compared with the conventional shingled battery.

[0046] The front design of the shingled battery with a single small strip graphic is shown Figure 3 , the back design of the shingled battery single small strip graphic can be seen Figure 4 , the front / back pad points are connected and conducted through conductive glue, see Figure 5 The advantages of shingled cells are: N single strip patterns (N is 1-10) can be designed on a single cell; shingled modules of different sizes can be customized as needed; the utilization rate of broken cells is improved, and as long as there are complete single strip cells, the laser cutting process can be used to cut the complete single strips to make shingled modules.

[0047] Example 1

[0048] A battery pad structure, consisting of a rectangular body and a sawtooth structure arranged on the edge of the rectangular body;

[0049] Among them, the length of the rectangular body is 2 mm, and the width of the rectangular body is 1 mm;

[0050] Specifically, in this embodiment, a sawtooth structure is provided on one long side of the rectangular body, and the sawtooth length of the sawtooth structure is 5% of the length of the long side;

[0051] At the same time, a sawtooth structure is provided on two wide sides of the rectangular body, and the sawtooth length of the sawtooth structure is 50% of the length of the wide side;

[0052] The ratio of the virtual and real sawtooth spacing of the sawtooth structure on the long side of the rectangular body is 1:1, and the ratio of the virtual and real sawtooth spacing of the sawtooth structure on the wide side of the rectangular body is 1:1;

[0053] The area of ​​the non-serrated portion in the Pad point region accounts for more than 50% of the total area.

[0054] Example 2

[0055] The difference between this embodiment and embodiment 1 is that in this embodiment, the sawtooth structure is only provided on the long side of the rectangular body, and the sawtooth structure is not provided on the wide side of the rectangular body;

[0056] The rest of the settings and parameters refer to Example 1.

[0057] Compared with Example 1, the Pad point structure of this embodiment will cause the conductive adhesive to not be fully utilized, resulting in poor power improvement effect of the shingled component.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 1 is that in this embodiment, the sawtooth structure is only provided on the wide side of the rectangular body, and the sawtooth structure is not provided on the long side of the rectangular body;

[0060] The rest of the settings and parameters refer to Example 1.

[0061] Example 4

[0062] The difference between this embodiment and embodiment 1 is that the length of the sawtooth structure on the long side of the rectangular body in this embodiment is 10% of the length of the long side;

[0063] The rest of the settings and parameters refer to Example 1.

[0064] Example 5

[0065] The difference between this embodiment and embodiment 1 is that the length of the sawtooth structure on the long side of the rectangular body in this embodiment is 15% of the length of the long side;

[0066] The rest of the settings and parameters refer to Example 1.

[0067] Example 6

[0068] The difference between this embodiment and embodiment 1 is that the length of the sawtooth structure on the long side of the rectangular body in this embodiment is 20% of the length of the long side;

[0069] The rest of the settings and parameters refer to Example 1.

[0070] Example 7

[0071] The difference between this embodiment and embodiment 1 is that the length of the sawtooth structure on the wide side of the rectangular body in this embodiment is 40% of the length of the wide side;

[0072] The rest of the settings and parameters refer to Example 1.

[0073] Example 8

[0074] The difference between this embodiment and embodiment 1 is that the length of the sawtooth structure on the wide side of the rectangular body in this embodiment is 30% of the length of the wide side;

[0075] The rest of the settings and parameters refer to Example 1.

[0076] Comparative Example 1

[0077] The difference between this comparative example and Example 1 is that in this comparative example, no serrated structure is provided on the long side and the wide side of the rectangular body;

[0078] The rest of the settings and parameters refer to Example 1.

[0079] Test example

[0080] According to the Pad point structures of Examples 1-8 and Comparative Example 1, shingled assemblies were respectively manufactured and tested according to the items in Table 1. The results are shown in Table 1.

[0081] Table 1

[0082]

[0083] The stacking position is photographed by an X-ray camera, and the results are shown in Figure 6 and Figure 7 ;from Figure 6 and Figure 7 It can be seen that the rectangular structure design of the conventional Pad point will result in more conductive glue not being utilized, while the optimized Pad point structure design, that is, further adding a serrated structure at the edge of the rectangular structure, can effectively improve the utilization rate of the conductive glue and is conducive to forming better conductivity.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery pad point structure, characterized in that: The invention comprises a rectangular body and a sawtooth structure arranged on the edge of the rectangular body.

2. The Pad point structure according to claim 1, characterized in that: The sawtooth length of the sawtooth structure on the wide side of the rectangular body is 10% to 50% of the length of the wide side.

3. The Pad point structure according to claim 2, characterized in that: The sawtooth length of the sawtooth structure on the wide side of the rectangular body is 25% to 35% of the length of the wide side.

4. The Pad point structure according to claim 3, characterized in that: The ratio of the virtual-real sawtooth spacing of the sawtooth structure on the wide side of the rectangular body is 1:2 to 2:

1.

5. The Pad point structure according to claim 1, characterized in that: The sawtooth length of the sawtooth structure on the long side of the rectangular body is 5% to 20% of the length of the long side.

6. The Pad point structure according to claim 5, characterized in that: The sawtooth length of the sawtooth structure on the long side of the rectangular body is 10% to 15% of the length of the long side.

7. The Pad point structure according to claim 6, characterized in that: The ratio of the virtual-real sawtooth spacing of the sawtooth structure on the long side of the rectangular body is 1:2 to 2:

1.

8. The Pad point structure according to any one of claims 1 to 7, characterized in that: The length-to-width ratio of the rectangular body is 6:1 to 2:

1.

9. The Pad point structure according to claim 8, characterized in that: The length of the rectangular body is 1 mm to 3 mm; The width of the rectangular body is 0.2 mm to 1 mm.

10. A shingled battery, characterized in that: It comprises the Pad point structure as described in any one of claims 1-9.

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