Photovoltaic module

Abstract

The application provides a photovoltaic module, comprising a plurality of cells, each cell comprising a cell body and an electrode pattern structure disposed on a surface of the cell body; and a plurality of conductive members electrically connecting adjacent cells. The electrode pattern structure comprises a plurality of electrode pattern units, each electrode pattern unit comprising a plurality of first main grid electrode lines, a plurality of second main grid electrode lines, a plurality of first fine grid electrode lines, and a plurality of second fine grid electrode lines. The plurality of electrode pattern units are arranged along a first direction, and a gap is provided between adjacent electrode pattern units. The conductive members span the gap. The gap can maintain a part of the complete cell junction area, thereby improving the photoelectric conversion efficiency of the cell. At least one electrode pattern unit further comprises a first pad and a second pad with an area larger than the first pad, and the first pad and the second pad are electrically connected by the first main grid electrode lines. The second pad provides a larger welding area, and the first pad assists in welding tension and provides effective current collection capability.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more specifically, to photovoltaic modules. Background Technology

[0002] For existing solar cells, maximizing photoelectric conversion efficiency has always been a goal pursued by those skilled in the art. The electrode pattern design on the cell can influence the photoelectric conversion efficiency of the solar cell. How to design the electrode structure on the cell surface and improve cell efficiency has always been a key research topic for those skilled in the art. Utility Model Content

[0003] This application provides photovoltaic modules to solve the aforementioned technical problems.

[0004] This application provides a photovoltaic module, including multiple solar cells, each solar cell including a cell body and an electrode pattern structure disposed on the surface of the cell body; and multiple conductive members, with adjacent solar cells electrically connected through the multiple conductive members. The electrode pattern structure includes several electrode pattern units, each electrode pattern unit including multiple first main grid electrode lines, multiple second main grid electrode lines, multiple first fine grid electrode lines, and multiple second fine grid electrode lines. The first and second main grid electrode lines extend along a first direction, and are spaced apart along a second direction. The first and second fine grid electrode lines extend along the second direction, and are spaced apart along the first direction. The first and second directions intersect. Each first fine grid electrode line connects to at least one first main grid electrode line. Each second fine grid electrode line connects to at least one second main grid electrode line. The polarities of the first main grid electrode lines and the first fine grid electrode lines are opposite to the polarities of the second main grid electrode lines and the second fine grid electrode lines. A plurality of electrode pattern units are arranged along a first direction, with gaps between adjacent electrode pattern units. At least one electrode pattern unit further includes a first pad and a second pad, which are electrically connected along the first direction via a first main gate electrode line. The area of ​​the first pad is smaller than the area of ​​the second pad. A conductive member spans the gap between adjacent electrode pattern units along a direction intersecting the second direction.

[0005] Thus, the solar cell of this application, by setting multiple electrode pattern units on the surface of the cell body with gaps between adjacent electrode pattern units, can reduce the structure of long main grid electrode lines. The gaps between adjacent electrode pattern units can maintain a portion of the complete cell junction region, which is beneficial to increasing the cell junction area and thus improving the cell's photoelectric conversion efficiency. Setting first and second pads of different sizes on the first main grid electrode line allows for two advantages: firstly, the relatively larger second pad provides a larger welding area to ensure welding pull force; secondly, the relatively smaller first pad assists in welding pull force, increases the flexibility of the interconnect design, and provides effective current collection capability.

[0006] Optionally, at least one electrode pattern unit further includes a third pad and a fourth pad, which are electrically connected along the first direction via a second main gate electrode line; the area of ​​the third pad is smaller than the area of ​​the fourth pad.

[0007] Optionally, along the first direction, the center of the adjacent first pad is not aligned with the center of the third pad.

[0008] Optionally, the area of ​​the fourth pad is larger than the area of ​​the second pad.

[0009] Optionally, along the first direction, the two sides of the second pad are respectively connected to the first pad via the first main gate electrode line; and / or, the first pad is disposed between two adjacent first fine gate electrode lines and in contact with the two adjacent first fine gate electrode lines.

[0010] Optionally, along the first direction, the fourth pad is connected to the third pad on both sides by the second main gate electrode line; and / or, the third pad is disposed between two adjacent second fine gate electrode lines and in contact with the two adjacent second fine gate electrode lines.

[0011] Optionally, in an electrode pattern unit, the fine grid electrode lines located at the outermost positions on both sides along the first direction are defined as edge fine grid electrode lines; on the surface of the cell body, the edge fine grid electrode lines are uninterrupted along the second direction; wherein, in at least one electrode pattern unit, the two edge fine grid electrode lines are of the same polarity or opposite polarity.

[0012] Optionally, along the first direction, the size of each electrode pattern unit is 9mm-20mm; and / or, the distance between adjacent first fine gate electrode lines or adjacent second fine gate electrode lines is 0.6mm-1.5mm.

[0013] Optionally, the number of electrode pattern units arranged along the first direction is 10-24.

[0014] Optionally, the edge fine gate electrode line has the same width as the first fine gate electrode line or the second fine gate electrode line along the first direction. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial structural diagram of a solar cell in a photovoltaic module according to an embodiment of this application.

[0017] Figure 2 for Figure 1 A magnified view of a portion of the battery cell structure shown.

[0018] Figure 3 for Figure 2 A magnified view of a portion of the battery cell structure shown.

[0019] Figure 4 for Figure 2 A magnified view of a portion of the battery cell structure shown.

[0020] Explanation of key component symbols:

[0021] 100 solar cells

[0022] Battery cell body 10

[0023] Electrode pattern structure 20

[0024] Electrode pattern unit 21

[0025] First main grid electrode line 211

[0026] Second main grid electrode line 212

[0027] First fine grid electrode line 213

[0028] Second fine grid electrode line 214

[0029] First edge fine grid electrode line 2131

[0030] Second edge fine grid electrode line 2141

[0031] Gap 22

[0032] First pad 30

[0033] Second pad 40

[0034] Third pad 50

[0035] Fourth pad 60

[0036] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0037] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0038] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] See Figure 1 and Figure 2This application provides a photovoltaic module including multiple solar cells 100. Each solar cell 100 includes a solar cell body 10 and an electrode pattern structure 20 disposed on the surface of the solar cell body 10; and multiple conductive members, with adjacent solar cells 100 electrically connected through the multiple conductive members. The electrode pattern structure 20 includes a plurality of electrode pattern units 21, each electrode pattern unit 21 including multiple first main grid electrode lines 211, multiple second main grid electrode lines 212, multiple first fine grid electrode lines 213, and multiple second fine grid electrode lines 214. The first main grid electrode lines 211 and 212 extend along a first direction A, and the first main grid electrode lines 211 and 212 are spaced apart along a second direction B. The first fine grid electrode lines 213 and 214 extend along the second direction B, and the first fine grid electrode lines 213 and 214 are spaced apart along the first direction A. The first direction A intersects the second direction B. In embodiments of this application, the first direction A is substantially perpendicular to the second direction B. Each first fine gate electrode line 213 is connected to at least one first main gate electrode line 211. Each second fine gate electrode line 214 is connected to at least one second main gate electrode line 212. The polarities of the first main gate electrode line 211 and the first fine gate electrode line 213 are opposite to the polarities of the second main gate electrode line 212 and the second fine gate electrode line 214. A plurality of electrode pattern units 21 are arranged along the first direction A, with gaps 22 between adjacent electrode pattern units 21. At least one electrode pattern unit 21 further includes a first pad 30 and a second pad 40, which are electrically connected along the first direction A via the first main gate electrode line 211; the area of ​​the first pad 30 is smaller than the area of ​​the second pad 40. A conductive member spans the gap 22 between adjacent electrode pattern units 21 along a direction intersecting the second direction B.

[0042] Thus, the photovoltaic module of this application, by setting multiple electrode pattern units 21 on the surface of the cell body 10, with gaps 22 between adjacent electrode pattern units 21, can reduce the structure of long main grid electrode lines. The gaps 22 between adjacent electrode pattern units 21 can maintain a part of the complete cell junction region, which is beneficial to increasing the cell junction area and thus improving the cell photoelectric conversion efficiency. Setting first pads 30 and second pads 40 of different sizes on the first main grid electrode line 211 allows for a larger welding area through the relatively larger second pads 40 to ensure welding pull force, while the relatively smaller first pads 30 can assist in welding pull force, increase the flexibility of the interconnect design, and provide effective current collection capability.

[0043] The areas of the first pad 30 and the second pad 40 can be the planar areas of the components as shown in the illustration, or they can be the projected areas of the first pad 30 and the second pad 40 on the battery cell body 10. The area of ​​the first pad 30 is smaller than the area of ​​the second pad 40. Specifically, the length of the first pad 30 in the first direction A can be less than the length of the second pad 40 in the first direction A, and the width of the first pad 30 in the second direction B can be equal to or unequal to the width of the second pad 40 in the second direction B.

[0044] In some embodiments, at least one second pad 40 is provided on each first main gate electrode line 211. In some embodiments, the first pad 30 is disposed on one side of the second pad 40 along a first direction A and is connected through the first main gate electrode line 211.

[0045] In some embodiments, the first pad 30 is disposed on opposite sides of the second pad 40 along a first direction A. The two sides of the second pad 40 are respectively connected to the first pad 30 via a first main gate electrode line 211.

[0046] In some embodiments, the plurality of first pads 30 and the plurality of second pads 40 may also be alternately spaced along the first direction A.

[0047] In all embodiments, the number of the first pad 30 and the second pad 40 can be adjusted according to design requirements, and this application is not limited thereto.

[0048] See Figure 3 and Figure 4 In some embodiments, the first pad 30 is disposed between adjacent first fine gate electrode lines 213 and contacts two adjacent first fine gate electrode lines 213 to electrically connect the two first fine gate electrode lines 213. Thus, along the first direction A, the length of the relatively small first pad 30 can be approximately the same as the distance between two adjacent first fine gate electrode lines 213 and is located between two adjacent first fine gate electrode lines 213. The length of the first pad 30 can be designed and adjusted to follow the variation in the spacing between the first fine gate electrode lines 213, which helps to reduce the area occupied by the first pad 30 on the adjacent heterogeneous electrode region, thereby increasing the area ratio of the battery junction region and the battery efficiency.

[0049] In some embodiments, at least one electrode patterning unit 21 further includes a third pad 50 and a fourth pad 60, which are electrically connected along a first direction A via a second main gate electrode line 212. The area of ​​the third pad 50 is smaller than the area of ​​the fourth pad 60. The areas of the third pad 50 and the fourth pad 60 can be the planar areas of the components as shown in the illustration, or they can be the projected areas of the third pad 50 and the fourth pad 60 on the cell body 10.

[0050] In some embodiments, at least one fourth pad 60 is provided on each second main gate electrode line 212. In some embodiments, a third pad 50 is provided on one side of the fourth pad 60 along a first direction A and is connected via the second main gate electrode line 212.

[0051] In some embodiments, the third pad 50 is disposed on opposite sides of the fourth pad 60 along the first direction A. The third pad 50 is connected to both sides of the fourth pad 60 via the second main gate electrode line 212.

[0052] In some embodiments, the plurality of third pads 50 and the plurality of fourth pads 60 may also be alternately spaced along the first direction A.

[0053] In all embodiments, the number of the third pad 50 and the fourth pad 60 can also be adjusted according to design requirements, and this application is not limited thereto.

[0054] The first pad 30, the second pad 40, the third pad 50, and the fourth pad 60 can be patterned structures disposed on the first main gate electrode line 211 and the second main gate electrode line 212, using non-burn-through paste, or can be formed by other conductive adhesive materials, as long as the design requirements are met, this application is not limited to this.

[0055] The conductive components include, but are not limited to, conductive structures such as solder strips, which can connect to the first solder pad 30, the second solder pad 40, the third solder pad 50, the fourth solder pad 60, and other structures on the battery cell 100.

[0056] Similar to the effect of the first pad 30 and the second pad 40 set on the first main gate electrode line 211, the third pad 50 and the fourth pad 60 of different sizes are set on the second main gate electrode line 212. The relatively larger fourth pad 60 can provide a larger welding area to ensure welding pull force, and the relatively smaller third pad 50 can be used to assist welding pull force, increase the flexibility of interconnect design and provide effective current collection capability.

[0057] In some embodiments, the third pad 50 is disposed between two adjacent second fine gate electrode lines 214 and contacts the two adjacent second fine gate electrode lines 214 to electrically connect them. Thus, along the first direction A, the size of the relatively small third pad 50 can be approximately the same as the distance between the two adjacent second fine gate electrode lines 214 and is located between them. The size of the third pad 50 can be designed and adjusted to follow the variation in the spacing between the second fine gate electrode lines 214, which helps to reduce the area occupied by the third pad 50 on the adjacent heterogeneous electrode region, thereby increasing the area ratio of the battery junction region and the battery efficiency.

[0058] By placing the relatively small first pad 30 between two adjacent first fine gate electrode lines 213 and the relatively small third pad 50 between two adjacent second fine gate electrode lines 214, the number of breaks in the irregular fine gate electrode lines near the first pad 30 or the second pad 40 can be reduced, which is beneficial to improving the current collection capability of the fine gate electrode lines and also helps to reduce the difficulty of process manufacturing.

[0059] In some implementations, such as Figure 4 As shown, along the second direction B, the centers of adjacent first pads 30 and third pads 50 are not aligned; in other words, the centers of adjacent first pads 30 and third pads 50 are staggered. This allows the first pads 30 and third pads 50 to be positioned as close as possible to adjacent first fine gate electrode lines 213 and adjacent second fine gate electrode lines 214, respectively. This further reduces the number of dissimilar fine gate electrode lines near the first pads 30 and third pads 50, thus reducing the area occupied by the first pads 30 and third pads 50 on adjacent dissimilar electrode regions and ensuring the area ratio of the cell junction region and cell efficiency.

[0060] See Figure 1 and Figure 2 In some embodiments, the area of ​​the fourth pad 60 is larger than that of the second pad 40, so that the second main gate electrode line 212 has better tensile strength during welding, thus meeting various application requirements.

[0061] In this application, in direction B, the distances between the first fine gate electrode line 213 and the third pad 50, the distances between the first fine gate electrode line 213 and the fourth pad 60, and the distances between the first fine gate electrode line 213 and the second main gate electrode line 212 may be the same or different; in direction B, the distances between the third pad 50 and the first fine gate electrode lines 213 on both sides may be the same or different, the distances between the fourth pad 60 and the first fine gate electrode lines 213 on both sides may be the same or different, and the distances between the second main gate electrode line 212 and the first fine gate electrode lines 213 on both sides may be the same or different.

[0062] Similarly, in direction B, the distances between the second fine gate electrode line 214 and the first pad 30, the distances between the second fine gate electrode line 214 and the second pad 40, and the distances between the second fine gate electrode line 214 and the first main gate electrode line 211 can be the same or different; in direction B, the distances between the first pad 30 and the second fine gate electrode lines 214 on both sides can be the same or different, the distances between the second pad 40 and the second fine gate electrode lines 214 on both sides can be the same or different, and the distances between the first main gate electrode line 211 and the second fine gate electrode lines 214 on both sides can be the same or different.

[0063] In some specific embodiments, the number of connectors provided on each first main gate electrode line 211 or each second main gate electrode line 212 of each electrode pattern unit 21 is 2-5, including at least one connector with a relatively large area. In other words, in each electrode pattern unit 21, the sum of the number of first pads 30 and second pads 40 on each first main gate electrode line 211 is 2-5, wherein the number of second pads 40 with a relatively large area is at least one; the sum of the number of third pads 50 and fourth pads 60 on each second main gate electrode line 212 is 2-5, wherein the number of fourth pads 60 with a relatively large area is at least one.

[0064] In some embodiments: in the electrode patterning unit 21, the fine grid electrode lines located at the outermost positions on both sides along the first direction A are defined as edge fine grid electrode lines. On the surface of the cell body 10, the edge fine grid electrode lines are uninterrupted along the second direction B; wherein, in at least one electrode patterning unit 21, two edge fine grid electrode lines have the same polarity or opposite polarity.

[0065] Specifically, the edge fine grid electrode lines include a first edge fine grid electrode line 2131 and a second edge fine grid electrode line 2141. At least one electrode pattern unit 21 has the first edge fine grid electrode line 2131 and the second edge fine grid electrode line 2141 respectively disposed at the outermost positions on both sides along the first direction A. On the surface of the battery cell body 10, the first edge fine grid electrode line 2131 and the second edge fine grid electrode line 2141 are both uninterrupted along the second direction B.

[0066] In some embodiments, the first edge fine gate electrode line 2131 connects to multiple first main gate electrode lines 211, and the second edge fine gate electrode line 2141 connects to multiple second main gate electrode lines 212. In this case, one end of the first main gate electrode line 211 extends to the first edge fine gate electrode line 2131, and the other end is spaced apart from the second edge fine gate electrode line 2141. One end of the second main gate electrode line 212 extends to the second edge fine gate electrode line 2141, and the other end is spaced apart from the first fine gate electrode line 2131. Optionally, the first edge fine gate electrode line 2131 can be a through-type first fine gate electrode line, and the second edge fine gate electrode line 2141 can be a through-type second fine gate electrode line.

[0067] In some embodiments, the first edge fine gate electrode line 2131 and the second edge fine gate electrode line 2141 are both connected to multiple first main gate electrode lines 211. In this case, the first main gate electrode lines 211 extend to the upper and lower edges of the electrode pattern unit 21. Optionally, the first edge fine gate electrode line 2131 and the second edge fine gate electrode line 2141 can both be through-type first fine gate electrode lines, respectively disposed on the upper and lower sides of the electrode pattern unit 21.

[0068] In some embodiments, the first edge fine gate electrode line 2131 and the second edge fine gate electrode line 2141 are both connected to multiple second main gate electrode lines 212. In this case, the second main gate electrode lines 212 extend to the upper and lower edges of the electrode pattern unit 21. Optionally, the first edge fine gate electrode line 2131 and the second edge fine gate electrode line 2141 can both be through-type second fine gate electrode lines, respectively disposed on the upper and lower sides of the electrode pattern unit 21.

[0069] Thus, through-type fine grid electrode lines can be formed on the upper and lower sides of each electrode pattern unit 21. A gap 22 is formed between two adjacent through-type fine grid electrode lines. Within this region, the battery junction region is not interrupted by the non-standard main grid electrode lines, thereby increasing the battery junction area and improving battery efficiency.

[0070] In some embodiments, the edge fine grid electrode lines and the first fine grid electrode line 213 or the second fine grid electrode line 214 have the same width along the first direction A. Thus, the edge fine grid electrode lines and the first fine grid electrode line 213 or the second fine grid electrode line 214 can be formed or processed in the same process. This helps to reduce the manufacturing difficulty of the solar cell 100 and improve manufacturing efficiency.

[0071] In one possible implementation, each electrode pattern unit 21 has a size of 9mm-20mm along the first direction A. Multiple electrode pattern units 21 are arranged in an array along the first direction A, with the number of segments being 10-24, to maximize the utilization of the surface area of ​​the battery cell body 10. In other embodiments, the number and arrangement direction of the electrode pattern units 21 can be set according to design requirements, and this application is not limited thereto.

[0072] In one possible implementation, the distance between adjacent first fine gate electrode lines 213 or adjacent second fine gate electrode lines 214 is 0.6mm-1.5mm. This ensures sufficient space between adjacent polarity fine gate electrodes for the placement of corresponding connectors.

[0073] The photovoltaic module of this application has multiple electrode pattern units on the surface of the main body of the cell 100, and a gap 22 between adjacent electrode pattern units. This can reduce the structure of long grid electrode lines, reduce the consumption of metal paste, and reduce the cost of the cell. The gap 22 between adjacent electrode pattern units can maintain a part of the complete cell junction area, which is beneficial to increase the cell junction area and thus improve the photoelectric conversion efficiency of the cell.

[0074] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A photovoltaic module, comprising: Multiple solar cells, each solar cell including a solar cell body and an electrode pattern structure disposed on the surface of the solar cell body; And, a plurality of conductive components, adjacent battery cells being electrically connected through the plurality of conductive components, characterized in that, The electrode pattern structure includes a plurality of electrode pattern units. Each electrode pattern unit includes a plurality of first main gate electrode lines, a plurality of second main gate electrode lines, a plurality of first fine gate electrode lines, and a plurality of second fine gate electrode lines. The first main gate electrode lines and the second main gate electrode lines extend along a first direction and are spaced apart along a second direction. The first fine gate electrode lines and the second fine gate electrode lines extend along a second direction and are spaced apart along the first direction. The first direction and the second direction intersect. Each first fine gate electrode line is connected to at least one first main gate electrode line; each second fine gate electrode line is connected to at least one second main gate electrode line; the polarity of the first main gate electrode lines and the first fine gate electrode lines is opposite to the polarity of the second main gate electrode lines and the second fine gate electrode lines. A plurality of the electrode pattern units are arranged along the first direction, and a gap is provided between adjacent electrode pattern units; At least one of the electrode pattern units further includes a first pad and a second pad, which are electrically connected along the first direction via the first gate electrode line; The area of ​​the first pad is smaller than the area of ​​the second pad; The conductive member spans the gap along a direction intersecting the second direction.

2. The photovoltaic module according to claim 1, characterized in that: At least one of the electrode pattern units further includes a third pad and a fourth pad, which are electrically connected along the first direction via the second gate electrode line; The area of ​​the third pad is smaller than the area of ​​the fourth pad.

3. The photovoltaic module according to claim 2, characterized in that: Along the first direction, the center of the adjacent first pad is not aligned with the center of the third pad.

4. The photovoltaic module according to claim 2, characterized in that: The area of ​​the fourth pad is larger than the area of ​​the second pad.

5. The photovoltaic module according to any one of claims 1-4, characterized in that: Along the first direction, the first pad is connected to both sides of the second pad via the first main gate electrode line; and / or, The first pad is disposed between two adjacent first fine gate electrode lines and is in contact with the two adjacent first fine gate electrode lines.

6. The photovoltaic module according to any one of claims 2-4, characterized in that: Along the first direction, the third pad is connected to both sides of the fourth pad via the second main gate electrode line; and / or, The third pad is disposed between two adjacent second fine gate electrode lines and is in contact with the two adjacent second fine gate electrode lines.

7. The photovoltaic module according to any one of claims 1-4, characterized in that: In the electrode pattern unit, the fine grid electrode lines located at the outermost edges along the first direction are defined as edge fine grid electrode lines; on the surface of the battery cell body, the edge fine grid electrode lines are uninterrupted along the second direction; wherein, In at least one of the electrode pattern units, the two edge fine grid electrode lines are of the same polarity or opposite polarity.

8. The photovoltaic module according to any one of claims 1-4, characterized in that: Along the first direction, the size of each electrode pattern unit is 9mm-20mm; and / or, The distance between adjacent first fine gate electrode lines or adjacent second fine gate electrode lines is 0.6mm-1.5mm.

9. The photovoltaic module according to any one of claims 1-4, characterized in that: Along the first direction, the number of electrode pattern units arranged is 10-24.

10. The photovoltaic module according to claim 7, characterized in that, The edge fine gate electrode line has the same width as the first fine gate electrode line or the second fine gate electrode line along the first direction.

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