Solar crystalline silicon battery piece

Abstract

The utility model provides a solar crystalline silicon cell, which comprises a cell body, a front electrode and a back electrode, the back electrode comprises two electrode matrixes arranged side by side, the two electrode matrixes are symmetrically arranged relative to the center line of the cell body, each electrode matrix comprises M * N electrodes, M and N are positive integers greater than 2, and M is a positive integer greater than 1. Electrodes located at four corners of the electrode matrix are defined as first electrodes, electrodes located at four edges of the electrode matrix are defined as second electrodes, electrodes located inside the electrode matrix are defined as third electrodes, the first electrodes and the second electrodes are electrodes with pins, and the third electrodes are electrodes without pins. According to the arrangement, the contact resistance of the solar crystalline silicon battery piece can be reduced, the conductive efficiency and the leaning performance are improved, the usage amount of the silver paste is reduced, and the production cost of the battery piece is reduced.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic components, in particular to a solar crystalline silicon cell sheet. Background Art

[0002] As an emerging clean and renewable energy source, solar cells have been widely used because of their advantages of directly converting solar energy into electrical energy, long life, simple maintenance, and unattended operation. The current manufacturing process of solar crystalline silicon cells includes: wet texturing, high-temperature diffusion, coating, screen printing, testing and other processes. Among them, screen printing is to use a non-mesh screen to distribute the back silver paste, back aluminum paste, and front silver paste on the front and back surfaces of the silicon wafer according to a certain graphic style. The function of the back electrode is to form a loop with the front electrode, which is conducive to the collection of current. In the prior art, the multiple back electrodes of the battery cell are equal in size and have a pin design. This design scheme makes the back contact resistance larger, and the amount of back silver paste used is also high.

[0003] Therefore, it is necessary to design a solar crystalline silicon cell to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a solar crystalline silicon cell sheet with low back contact resistance, high conductive efficiency and reliability.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a solar crystalline silicon cell, which includes a cell body, a front electrode and a back electrode, the back electrode includes two electrode matrices arranged side by side, the two electrode matrices are symmetrically arranged relative to the midline of the cell body, each electrode matrix includes M×N electrodes, M and N are both positive integers greater than 2, the electrodes located at the four corners of the electrode matrix are defined as first electrodes, the electrodes located on the four sides of the electrode matrix are defined as second electrodes, and the electrodes located inside the electrode matrix are defined as third electrodes, the first electrode and the second electrode are pin-equipped electrodes, and the third electrode is a pin-free electrode.

[0006] As a further improved technical solution of the utility model, 2≤M≤12, 2≤N≤5, N<M, and the back electrode is distributed in 2N×M as a whole.

[0007] As a further improved technical solution of the utility model, M=10, N=4.

[0008] As a further improved technical solution of the utility model, the height of the second electrode protruding from the battery cell body is 0.05-0.15 mm smaller than the height of the first electrode protruding from the battery cell body.

[0009] As a further improved technical solution of the present invention, the height of the second electrode protruding from the battery cell body is 0.1 mm less than the height of the first electrode protruding from the battery cell body.

[0010] As a further improved technical solution of the utility model, the back electrode is a silver electrode.

[0011] As a further improved technical solution of the utility model, there is a half-sheet cutting line between the two electrode matrices, and the two electrode matrices are symmetrically arranged relative to the half-sheet cutting line.

[0012] It can be seen from the above technical scheme that the solar crystalline silicon cell of the utility model sets the back electrode as two symmetrical electrode matrices, and sets the first electrode and the second electrode of each electrode matrix as pin-equipped electrodes, and sets the third electrode as a pin-free electrode. On the one hand, it can effectively reduce the contact resistance on the back of the cell and improve the conductive efficiency and reliability. On the other hand, it reduces the use of printing paste and improves the wet weight reduction effect of the cell. In addition, the solar crystalline silicon cell of the utility model can also be cut into half cells for use, so its scope of use can also be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the back side of a solar crystalline silicon cell according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Please refer to Figure 1 As shown, the utility model provides a solar crystalline silicon cell, which includes a cell body 10, a front electrode and a back electrode 20. The back electrode 20 is a silver electrode printed on the back of the cell body 10 by screen printing.

[0016] The back electrode 20 includes two electrode matrices 20a and 20b arranged side by side, and the two electrode matrices 20a and 20b are symmetrically arranged relative to the midline of the battery cell body 10. The electrodes located at the four corners of the electrode matrices 20a and 20b are defined as the first electrodes 21, the electrodes located on the four sides of the electrode matrices 20a and 20b are defined as the second electrodes 22, and the electrodes located inside the electrode matrices 20a and 20b are defined as the third electrodes 23. The first electrode 21 and the second electrode 22 are pin electrodes, and the third electrode 23 is a pinless electrode. Such an arrangement can effectively reduce the contact resistance on the back of the battery cell and improve the conductive efficiency and reliability. In addition, the third electrode 23 is inside the printed area of ​​the battery cell, without contact risk, and increases the effect of reducing wet weight.

[0017] The electrode matrices 20a and 20b include M×N electrodes respectively, where M and N are both positive integers greater than 2. Preferably, in the electrode matrices 20a and 20b, 2≤M≤12, 2≤N≤5, N<M, and the back electrodes are distributed in 2N×M as a whole, that is, the electrode matrices 20a and 20b are arranged side by side in the arrangement direction of the N electrodes. In this embodiment, M=10, N=4, therefore, the number of first electrodes 21 in each battery matrix is ​​4, the number of second electrodes is 20, and the number of third electrodes is 16.

[0018] The height of the second electrode 22 protruding from the battery cell body 10 is 0.05-0.15mm less than the height of the first electrode 21 protruding from the battery cell body 10. In this embodiment, the height of the second electrode 22 protruding from the battery cell body is 0.1mm less than the height of the first electrode protruding from the battery cell body 10. This arrangement can improve the welding shadowing around the four sides and the four corners, meet the requirements of edge contact, and also achieve the effect of reducing wet weight and saving silver paste.

[0019] There is a half-cell cutting line L between the two electrode matrices 20a and 20b, and the two electrode matrices 20a and 20b are symmetrically arranged relative to the half-cell cutting line L. In this embodiment, the half-cell cutting line L is the center line of the cell. In the half-cell cell after cutting, the electrodes at the four corners and four sides of the back electrode are pin electrodes, which can still ensure the contact effect of the half-cell cell.

[0020] In summary, the solar crystalline silicon cell of the utility model sets the back electrodes as two symmetrical electrode matrices, sets the first electrode and the second electrode of each electrode matrix as pin-equipped electrodes, and sets the third electrode as a pin-free electrode. On the one hand, it can effectively reduce the contact resistance on the back of the cell and improve the conductive efficiency and reliability. On the other hand, it reduces the use of printed silver paste and improves the wet weight reduction effect of the cell. In addition, the solar crystalline silicon cell of the utility model can also be cut into half cells for use, so its scope of use can also be guaranteed.

[0021] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A solar crystalline silicon cell, Features: It includes a battery cell body, a front electrode and a back electrode, the back electrode includes two electrode matrices arranged side by side, the two electrode matrices are symmetrically arranged relative to the midline of the battery cell body, each electrode matrix includes M×N electrodes, M and N are both positive integers greater than 2, the electrodes located at the four corners of the electrode matrix are defined as first electrodes, the electrodes located on the four sides of the electrode matrix are defined as second electrodes, and the electrodes located inside the electrode matrix are defined as third electrodes, the first electrode and the second electrode are pin-equipped electrodes, and the third electrode is a pin-free electrode.

2. The solar crystalline silicon cell according to claim 1, Features: 2≤M≤12, 2≤N≤5, N<M, and the back electrode is distributed in 2N×M as a whole.

3. The solar crystalline silicon cell according to claim 1, Features: M=10, N=4.

4. The solar crystalline silicon cell according to claim 1, Features: The height of the second electrode protruding from the battery cell body is 0.05-0.15 mm less than the height of the first electrode protruding from the battery cell body.

5. The solar crystalline silicon cell according to claim 1, Features: A height of the second electrode protruding from the battery cell body is 0.1 mm less than a height of the first electrode protruding from the battery cell body.

6. The solar crystalline silicon cell according to claim 1, Features: The back electrode is a silver electrode.

7. The solar crystalline silicon cell according to claim 1, Features: A half-sheet cutting line is provided between the two electrode matrices, and the two electrode matrices are symmetrically arranged relative to the half-sheet cutting line.

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