CN114388635A

CN114388635A - Battery piece capable of reducing silver consumption

Info

Publication number: CN114388635A
Application number: CN202110771833.8A
Authority: CN
Inventors: 茅静; 柳伟; 殷丽; 张学玲; 徐建美
Original assignee: Trina Solar Changzhou Technology Co ltd; Trina Solar Co Ltd
Current assignee: Trina Solar Changzhou Technology Co ltd; Trina Solar Co Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-04-22
Also published as: WO2023280308A1

Abstract

The invention discloses a battery piece for reducing silver consumption. The auxiliary grid line is a plurality of, and a plurality of auxiliary grid line intervals set up, and auxiliary grid line and main grid line are the contained angle setting, and a plurality of pad point are listed as interval distribution, and every pad point is listed as including a plurality of pad points that set up along the length direction interval of main grid line, all is equipped with hollow out construction on every pad point. At least one pad dot row and the main grid line are arranged at intervals. The battery piece capable of reducing silver consumption can realize larger energy efficiency by adopting a small number of main grid lines, and reduces the silver consumption of the battery piece, thereby reducing the manufacturing cost of the battery piece.

Description

Battery piece capable of reducing silver consumption

Technical Field

The invention relates to the technical field of battery equipment, in particular to a battery piece capable of reducing silver consumption.

Background

Photovoltaic cells are currently designed with multiple primary grid structures to boost cell and module power. The main grid structure of the multi-main-grid battery generally comprises Pad points and main grid lines among the Pad points, and the main grid lines are mainly used for replacing welding strips during battery testing and play a role in converging fine grids to a probe bank. The Pad point mainly plays a role in fixing the welding strip after welding and resisting thermal cycle test stress in a long-term aging process. However, as the number of the main grid structures increases, the number of the main grid lines and the number of the pad points also increase, so that the silver consumption of the main grid structures also increases, and the efficiency improvement of the photovoltaic cell is limited to a certain extent.

Disclosure of Invention

The invention aims to provide a battery piece capable of reducing silver consumption, which can realize higher energy efficiency by adopting a smaller number of main grid lines, and reduces the silver consumption of the battery piece, thereby reducing the manufacturing cost of the battery piece.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

the invention discloses a battery piece for reducing silver consumption, which comprises: at least one main grid line; a plurality of auxiliary grid lines are arranged at intervals, and the auxiliary grid lines and the main grid lines form an included angle; pad point row, it is a plurality of pad point row interval distribution, every pad point row includes the pad point that a plurality of intervals set up, every all be equipped with hollow out construction on the pad point, wherein: at least one pad dot row and the main grid line are arranged at intervals.

In some embodiments, the pad point includes a plurality of strip structures arranged at intervals, and the spacing groove between two adjacent strip structures forms the hollow structure.

In some specific embodiments, the width of the spacing groove is D1, and D1 satisfies the relation: 20um < D1<200 um.

In some embodiments, the pad point includes a body, and a hollow groove is formed on the body.

In some specific embodiments, the number of the hollow-out grooves is multiple, and the multiple hollow-out grooves are arranged in multiple rows and multiple columns or in a circumferential array.

In some specific embodiments, the thickness of the body is H1, the depth of the hollow-out groove is H2, and H1 and H2 satisfy the following relation: h1 ═ H2.

In some embodiments, the pad point includes a body, and the body is provided with a plurality of through holes, and the plurality of through holes are arranged in multiple rows and multiple columns or in a circumferential array.

In some embodiments, the pad dots in the same pad dot column have different sizes.

In some specific embodiments, the size of the pad dots in the same pad dot column gradually decreases from two ends to the middle.

In some embodiments, the bus bar is a break line.

The battery piece for reducing silver consumption has the beneficial effects that: because the pad points have the hollow structures, the pad points can be arranged at the intersection points of the main grid lines and the auxiliary grid lines and can also be arranged on the auxiliary grid lines and arranged at intervals with the main grid lines, on the premise of ensuring the series welding precision, the series welding strength and the energy efficiency of the battery piece, the number of the main grid lines is reduced, the silver consumption of the pad points is reduced, and the manufacturing cost of the battery piece is reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a battery plate for reducing silver consumption according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a first pad point of a battery cell for reducing silver consumption according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a second pad point of a battery plate for reducing silver consumption according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a third pad point of a battery plate for reducing silver consumption according to an embodiment of the invention;

FIG. 5 is a schematic view of welding a pad point and a solder strip of a battery plate with reduced silver consumption according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another battery plate for reducing silver consumption according to an embodiment of the invention.

Reference numerals:

1. a main gate line; 2. an auxiliary gate line; 3. a pad point; 31. a strip structure; 311. a spacing groove; 32. a body; 321. hollowing out the grooves; 322. perforating; 100. and (7) welding the strip.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific structure of the battery cell for reducing silver consumption according to the embodiment of the present invention will be described with reference to fig. 1 to 6.

The invention discloses a battery piece for reducing silver consumption, which comprises at least one main grid line 1, a plurality of auxiliary grid lines 2 and a plurality of pad point rows, wherein the auxiliary grid lines 2 are arranged at intervals, the auxiliary grid lines 2 and the main grid line 1 form an included angle, the plurality of pad point rows are distributed at intervals, each pad point row comprises a plurality of pad points 3 arranged at intervals, each pad point 3 is provided with a hollow structure, and at least one pad point row is arranged at intervals with the main grid line 1.

It can be understood that at least one pad column of the pad points 3 of the battery cell of the present embodiment is spaced from the main gate line 1, compared to the prior art in which the pad points 3 are only disposed at the intersections of the main gate line 1 and the auxiliary gate lines 2. Therefore, under the condition that the number of pad points 3 is the same, the cell sheet of the present embodiment has a smaller number of the bus bars 1, and the number of the bus bars 1 of the present embodiment may be one half or even one n times the number of the prior art (n is the number of the bus bars 1 of the prior art). It should be noted that, because the pad points 3 can be directly disposed on the auxiliary grid lines 2, after the battery piece is welded to the solder strip 100, the current can flow from the main grid lines 1 to the solder strip 100, or from the auxiliary grid lines 2 to the solder strip 100, although the number of the main grid lines 1 is small, no extra current loss is caused. Meanwhile, although the pad points 3 are provided with the hollow structures, the overall size is not changed, and therefore the precision of series welding is not affected. And because the hollow structure is additionally arranged, the soldering tin is filled in the hollow structure after being melted, so that side welding force can be provided, and certain help is provided for welding tension, thereby improving the connection stability of the welding strip 100 and the battery piece.

In summary, in the battery piece of this embodiment, because the pad points 3 have the hollow structures, and the pad points 3 can be disposed at the intersections of the main grid lines 1 and the auxiliary grid lines 2, and can be disposed on the auxiliary grid lines 2 and spaced from the main grid lines 1, on the premise of ensuring the series welding precision, the series welding strength, and the energy efficiency of the battery piece, the number of the main grid lines 1 is reduced, the silver consumption of the pad points 3 is reduced, and thus the manufacturing cost of the battery piece is reduced.

What needs to be supplemented additionally is that along with the reduction of the diameter of the welding strip 100, the modulus of the welding strip 100 and the further reduction of the welding temperature, the hollowed-out proportion of the pad points 3 can be further improved, so that the design without the main grid lines 1 is gradually realized, only two test grid lines for testing are reserved, and the silver consumption of the battery piece is greatly reduced.

In some embodiments, as shown in fig. 2, the pad dots 3 include a plurality of spaced bar structures, and the spacing grooves 311 between two adjacent bar structures form hollow structures. It can be understood that pad point 3 forms the bar structure that a plurality of intervals set up, has reduced the silver of pad point 3 on the one hand and has consumed, and on the other hand is favorable to soldering tin to fill in hollow out construction, promotes the battery piece and welds the stability of taking 100.

In some specific embodiments, the width of the spacing slot 311 is D1, and D1 satisfies the relationship: 20um < D1<200um it can be understood that the width of the spacing slot 311 is too large or too small, which affects normal welding, and in this embodiment, the width of the spacing slot 311 is controlled between 20um and 200um, which can not only control the silver consumption of the pad point 3, but also ensure the welding stability of the battery piece and the solder strip 100. Of course, in other embodiments of the present invention, the width D1 of the spacing slot 311 may be selected from other ranges according to actual needs, and is not limited to the above range.

In some embodiments, as shown in fig. 3, the pad point 3 includes a body 32, and a hollow groove 321 is formed on the body 32. It can be understood that, compare in pad point 3 and include the bar structure of a plurality of intervals settings, directly set up fretwork groove 321 on body 32, made things convenient for getting of pad point 3 to made things convenient for pad point 3 and welded strip 100 to weld.

In some specific embodiments, as shown in fig. 3, there are a plurality of the hollow-out grooves 321, and the plurality of hollow-out grooves 321 are arranged in multiple rows and multiple columns or in a circumferential array. Therefore, the silver consumption of the pad points 3 can be controlled, and the welding stability of the battery piece and the welding strip 100 can be ensured.

In some specific embodiments, the thickness of the body 32 is H1, the depth of the hollow-out groove 321 is H2, and H1 and H2 satisfy the following relation: h1 ═ H2.

In some embodiments, as shown in fig. 4, the pad dot 3 includes a body 32, a plurality of through holes 322 are formed on the body 32, and the plurality of through holes 322 are arranged in multiple rows and multiple columns or in a circumferential array. Therefore, the silver consumption of the pad points 3 can be controlled, and the welding stability of the battery piece and the welding strip 100 can be ensured. Compared with the hollow groove 321, the processing of the through hole 322 is simpler, and the processing of the pad point 3 is simplified.

It should be added that in the present embodiment, the cross section of the through hole 322 is any one of a rectangle, a circle, a triangle, an ellipse, an oblong and other irregular shapes, and the shape of the cross section of the through hole 322 can be selected according to actual needs, and the shape of the through hole 322 is not specifically limited herein.

In some embodiments, the plurality of pad dots 3 in the same pad dot column have different dimensions. Therefore, the size of the pad point 3 can be modified according to actual welding requirements, and the pad point 3 can be welded in a proper size.

In some embodiments, the size of the plurality of pad dots 3 in the same pad dot column gradually decreases from two ends to the middle. It can be understood that, compared with the middle, the two ends of the welding strip 100 are more prone to have the phenomenon of reliable desoldering, and the pad points 3 at the two ends have larger sizes, so that the welding firmness at the two ends of the welding strip 100 can be ensured, and the connection stability of the welding strip 100 and the battery piece is improved.

In some embodiments, the bus bar 1 is a break line, as shown in fig. 6. Therefore, the silver consumption of the main grid line 1 can be further reduced, and the manufacturing cost of the battery piece is reduced.

Example (b):

a battery cell according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, the battery plate of this embodiment has three main grid lines 1 arranged at intervals, a plurality of auxiliary grid lines 2 arranged at intervals, and five pad dot rows, and each pad dot row includes a plurality of pad dots 3 arranged at intervals along the length direction of the main grid lines 1. As shown in fig. 2, each pad dot 3 includes a plurality of spaced-apart stripe structures.

It should be added that, as shown in fig. 3-4, the pad point 3 of the present embodiment may further include a body 32, and the body 32 is provided with a plurality of hollow-out grooves 321 or the body 32 is provided with a plurality of through holes 322. As shown in fig. 6, the bus bar 1 of the present embodiment may not be a continuous line, but may be a discontinuous line as shown in fig. 6.

In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A battery piece with reduced silver consumption, comprising:

at least one main grid line (1), wherein the number of the main grid lines (1) is one;

the grid line structure comprises a plurality of auxiliary grid lines (2), wherein the plurality of auxiliary grid lines (2) are arranged at intervals, and the auxiliary grid lines (2) and the main grid line (1) form an included angle;

pad point row, it is a plurality of pad point row interval distribution, every pad point row includes pad point (3) that a plurality of intervals set up, every all be equipped with hollow out construction on pad point (3), wherein: at least one pad point row and the main grid line (1) are arranged at intervals.

2. The battery piece capable of reducing silver consumption according to claim 1, wherein the pad points (3) comprise a plurality of strip-shaped structures arranged at intervals, and the spacing grooves (311) between two adjacent strip-shaped structures form the hollowed-out structures.

3. The battery piece for reducing silver consumption according to claim 2, wherein the width of the spacing groove (311) is D1, and D1 satisfies the relation: 20um < D1<200 um.

4. The battery piece for reducing silver consumption according to claim 1, wherein the pad points (3) comprise a body (32), and hollow grooves (321) are formed in the body (32).

5. The battery piece for reducing silver consumption according to claim 4, wherein the number of the hollowed-out grooves (321) is multiple, and the hollowed-out grooves (321) are arranged in multiple rows and multiple columns or in a circumferential array.

6. The battery piece for reducing silver consumption according to claim 4, wherein the thickness of the body (32) is H1, the depth of the hollow groove (321) is H2, and H1 and H2 satisfy the relation: h1 ═ H2.

7. The battery piece for reducing silver consumption according to claim 1, wherein the pad points (3) comprise a body (32), the body (32) is provided with a plurality of through holes (322), and the plurality of through holes (322) are arranged in a plurality of rows and columns or a circumferential array.

8. The battery piece for reducing silver consumption according to any one of claims 1 to 7, wherein a plurality of pad dots (3) in the same pad dot row have different size specifications.

9. The battery piece for reducing silver consumption according to claim 8, wherein the size of the pad dots (3) in the same pad dot column is gradually reduced from two ends to the middle.

10. The battery piece for reducing silver consumption according to any one of claims 1 to 7, wherein the bus bar (1) is a discontinuous line.