CN204348734U - A kind of crystal-silicon battery slice and crystal silicon battery assembly - Google Patents

Abstract

The utility model aims at the disadvantages that the existing crystalline silicon battery components are connected in series by soldering strips, so that the cost of the battery components is high, the effective output power is reduced, and the operation is difficult during welding, and provides a crystalline silicon battery sheet and a crystalline silicon battery component. The battery sheet of this battery assembly includes a crystalline silicon battery sheet substrate and a metal back field arranged on the back of the battery sheet substrate as the positive electrode of the battery sheet. The front side of the crystalline silicon battery sheet substrate is provided with a plurality of sub-grid lines. There is no front main grid line of the cell between the two ends of the auxiliary grid lines on the front side, and no main grid line on the back of the cell is installed on the metal back field opposite to the two ends of the auxiliary grid lines. This structure adopts the Advanced crystalline silicon cells and components effectively increase the output power of cells, save materials and processes, reduce costs and improve work efficiency. Due to the stacked connection between cells, welding strips are omitted.

Description

A crystalline silicon cell and a crystalline silicon cell assembly

technical field

The utility model relates to a crystalline silicon battery sheet and a crystalline silicon battery component capable of omitting welding strips.

Background technique

In the prior art, it is generally believed that when the length of the thin grid lines exceeds 50 mm, the confluence effect of the bus bar to the thin grid lines will become poor. Therefore, in order to improve the confluence effect of the cells, silicon cells generally adopt the following structure: Including a crystalline silicon chip body, a plurality of thin grid lines and at least two busbar lines connected to each thin grid line are arranged on the crystalline silicon wafer body, and each busbar line is connected in series with each thin grid line, and the main grid lines connect Each thin grid line is divided into at least two regions, and the current of each thin grid line is collected by the main grid line. For example, the Chinese utility model patent with the patent number 201120496826.3 has a notification number of CN202339923U, or the Chinese utility model patent with a patent number of 201120507425.3 has a notification number of CN202339925U, and the Chinese utility model patent with a patent number of 2011205065.3 has a notification number of CN202339926U , all disclose the crystalline silicon battery of the above structure. The use of the crystalline silicon cell with the above structure to make a crystalline silicon cell assembly has the following disadvantages: 1) It is necessary to use a welding ribbon to connect the main grid lines of each cell in series, so that the currents of a plurality of cells are integrated into a total current, and the soldering ribbon and The busbar increases the manufacturing cost of the battery assembly; 2) Since the busbar almost runs through the width of the entire battery sheet, when connecting each battery sheet, it is necessary to use a welding tape to cover the busbar on each battery sheet. To ensure the effective power of the cells, the solder strips must cover the busbar lines completely and cannot exceed the busbar lines. This is called "zero whiteout" in the industry. Zero whiteout puts high requirements on the welding process, and it has not been possible in the industry so far. Realize "zero exposed white"; 3) Since the battery is a crystalline silicon battery, the welding ribbon is a copper-based ribbon, and the ratio of the thermal expansion coefficient of silicon to copper is 1:6. Therefore, during the welding process, the silicon matrix The expansion and deformation of the silicon wafer and the copper-based ribbon are very different after heating, which can easily lead to broken grids or even cracks in the module, which seriously affects the quality of the finished module; 4) The ribbon installed on the battery takes up the The effective lighting area reduces the conversion efficiency of the module. Some studies have shown that the effective power of each module can be increased by 4 to 5 watts if the mainstream tri-grid 60-cell battery module can use the ribbon shielding area; 5) due to the In the battery module, the battery slices are connected in series by the welding ribbon. Among the two adjacent battery slices, the front faces of the two battery slices are set upwards, and one end of the welding ribbon is connected to the front of one of the battery slices. The other end of the ribbon is connected to the opposite side of the other cell. When the ribbon travels from the front of one cell to the reverse of the other cell, a certain gap needs to be left between two adjacent cells. This gap is called the "sheet pitch", which increases the area of raw materials such as EVA, TPT, and glass used to package the battery assembly, increases the volume of the entire battery assembly, and increases the production cost.

Utility model content

The purpose of this utility model is to provide a crystalline silicon cell and a crystalline silicon battery pack.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A crystalline silicon cell, comprising a crystalline silicon cell substrate and a metal back field arranged on the back of the cell substrate as the positive electrode of the cell, and a plurality of auxiliary gate lines are arranged on the front of the crystalline silicon cell substrate, each The auxiliary grid lines do not intersect each other. The end one of each auxiliary grid line is arranged at one end of the battery sheet, and the end two of each auxiliary grid line is arranged at two ends of the battery sheet substrate. There is no main grid line on the front of the cell between the two ends of the auxiliary grid line, and there is no main grid line on the back of the battery cell at the position opposite to the two ends of the auxiliary grid line on the metal back field;

Neither the front nor the back of the cell substrate is provided with busbars;

At least one battery front busbar line is arranged on the front of the battery sheet substrate, at least one battery sheet back busbar line is arranged on the metal back field of the battery sheet substrate, the battery sheet front busbar line and the battery sheet back busbar line They are all located at the end of the battery sheet and arranged along the edge of the battery sheet;

There is one main grid line on the front of the battery sheet, which is electrically connected to end one/end two of the auxiliary grid line, and one main grid line on the back of the battery sheet, which is located at end two/end one of the auxiliary grid line place;

There are two main grid lines on the front of the battery sheet, which are intersected along two adjacent sides of the battery sheet, and one of the front main grid lines of the battery sheet is electrically connected to end one/end two of the auxiliary grid line; There are two main grid lines on the back of the battery sheet, which are intersected along the other two adjacent sides of the battery sheet, and the main grid lines on the back of a box of battery sheets correspond to the end two/end one of the auxiliary grid line;

There is one main grid line on the front of the battery sheet, which is electrically connected to the end one/end two of the auxiliary grid line. There are three main grid lines on the back of the battery sheet, and one of the main grid lines on the back of the battery sheet is located on the auxiliary grid line. End 2/End 1 of the battery, and one end of the other two main grid lines on the back of the cell is electrically connected to the corresponding end of the main grid line on the back of the battery located at End 2/End 1 of the sub-grid;

The auxiliary grid lines are arranged in parallel along the edge of the battery sheet, and the main grid lines on the front of the battery sheet and the main grid lines on the back of the battery sheet are arranged parallel to or perpendicular to the main grid lines;

A crystalline silicon battery assembly, comprising at least one group of battery assembly strings composed of at least two battery slices connected in series, and each battery assembly string is connected in series, characterized in that the battery assembly described in any one of claims 1-6 is used In each battery assembly string, two adjacent battery slices are superimposed and fixed in series through the metal back field of the battery slice corresponding to the end two of the sub-grid line of the front battery slice and the end of the sub-grid line of the rear battery slice. connect;

The two adjacent battery sheets are fixed and electrically connected by conductive tape or welding strip;

The photovoltaic battery module includes at least two battery module strings, each battery module string is arranged side by side, and the head end or tail end of two adjacent rows of battery modules are fixedly connected by a bus belt or a welding belt or a battery tape.

Compared with the prior art, the present invention has the following beneficial effects: since the front of the battery sheet, between the two ends of the auxiliary grid line and the corresponding parts of the back of the battery sheet and the two ends of the auxiliary grid line are not provided Therefore, the main grid line does not occupy the effective working area of the battery sheet or occupies a small amount of the effective working area of the battery sheet, thereby improving the output power of the battery sheet.

Since the main grid lines are not arranged on the battery sheet or the main grid lines are arranged along the edge of the battery sheet, the main grid lines will not occupy the effective working area of the battery sheet, or occupy a small effective working area of the battery sheet, which improves the efficiency of the battery. The output efficiency of the cell. The important thing is that the number of busbars is significantly reduced due to the absence of busbars or the arrangement of busbars at the joints of the cells, so that ribbons can be saved, or no ribbons can be used for confluence, so the welding process of ribbons can be omitted , save materials and processes, and improve work efficiency while reducing costs.

For battery components, due to the stacked connection between the battery sheets, the welding ribbon is omitted, which not only saves the welding ribbon material, but also saves the welding ribbon process, so that the fragility of the battery pieces caused by the welding of the welding ribbon is eliminated. It has been effectively solved, and a new structure of battery components and battery component manufacturing technology is provided for the industry.

Description of drawings

Figure 1.1 Schematic diagram of the structure of the first embodiment of the crystalline silicon solar cell of the present invention;

Figure 1.2 is a D-D sectional view of Figure 1.1;

Figure 1.2.1 is a partial enlarged view of part F in Figure 1.2;

Figure 1.3 is a sectional view of A-A in Figure 1.1;

Figure 1.3.1 is a partial enlarged view of part C in Figure 1.3;

Figure 1.3.2 is a partial enlarged view of part E of Figure 1.3;

Figure 1.4 is the bottom view of Figure 1.3;

Figure 2.1 Schematic diagram of the structure of the second embodiment of the crystalline silicon cell of the present invention;

Figure 2.2 is a sectional view of I-I in Figure 2.1;

Figure 2.2.1 is a partial enlarged view of part L in Figure 2.2;

Figure 2.3 is the H-H sectional view of Figure 2.1;

Figure 2.4 is the bottom view of Figure 2.3;

Figure 3.1 is a schematic structural diagram of the third embodiment of the crystalline silicon cell of the present invention;

Figure 3.2 is the rear view of Figure 3.1;

Fig. 4 is a schematic diagram of Embodiment 1 of the connection structure of photovoltaic cell modules composed of cells according to the embodiment of the present invention;

Figure 4.1 is a partial enlarged view of Figure 4D;

Figure 4.2 is a schematic diagram of the second embodiment of the connection structure of photovoltaic cell modules composed of cells according to the embodiment of the present invention;

Fig. 5 is a schematic diagram of Embodiment 3 of the connection structure when the cells of Embodiment 2 of the present invention are used to form a photovoltaic cell module.

Figure 6.1 is a schematic structural diagram of the fourth embodiment of the crystalline silicon cell of the present invention;

Figure 6.2 is the rear view of Figure 6.1;

Figure 7.1 is a schematic structural diagram of the fifth embodiment of the crystalline silicon cell of the present invention;

Figure 7.2 is the rear view of Figure 7.1;

Figure 8.1 and Figure 5 are schematic diagrams of Embodiment 4 of the connection structure when crystalline silicon solar cells are composed of Figure 6.1 and Figure 7.1 of the present invention;

Figure 8.1.1 is the N-N sectional view of Figure 8.1;

Figure 8.1.2 is the M-M sectional view of Figure 8.1.

Explanation of reference signs

1-battery substrate, 2-battery front busbar, 3-metal back field, 4-battery back busbar, 5-secondary grid, 6-conductive tape, 7-battery, 8-bus bar 9-Lead out the positive pole 10-Lead out the negative pole 11-End 1 12-End 2 13-Battery base end 1 14-Battery base 2 15-Extended piece 16-Common piece

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

As shown in Figures 1.1 to 3.2, the solar crystalline silicon cell with the structure of the present invention includes a cell substrate 1 and a metal back field 3 as the positive electrode of the cell. Grid lines 5, each auxiliary grid line 5 has end one 11 and end two 12, end one 11 of each auxiliary grid line is located at end one 13 of the cell substrate, end two of each auxiliary grid line 12 is located at the end 14 of the base body of the battery sheet. Each sub-grid line can be straight or curved, but each sub-grid line does not intersect. Each sub-grid line 5 can be arranged in parallel or can be radioactive array. On this basis, the present invention has the following preferred embodiments, but not limited to the following embodiments. Preferably, the metal back field 3 is an aluminum back field.

In Embodiment 1, busbar lines are not arranged on the front and back sides of the cell substrate. That is, the battery sheet of the present invention is not provided with bus bars.

In embodiment 2, the battery front main grid lines 2 are only arranged on the front of the battery sheet substrate and at the ends of each auxiliary grid line, and the front main grid lines of the battery sheet are electrically connected with each auxiliary grid line. On the back of the substrate, at the end of the substrate of the cell, there is a busbar 4 on the back of the cell, and the busbar 4 on the back of the cell is electrically connected to the metal back field 3 . In this way, the busbars are set, the front busbars of the battery are located at one end of the battery, the back busbars of the battery are located at two ends of the battery, and the busbars of the battery are only set along the edge of the battery substrate. The middle part of the front and the back of the battery is not provided with the battery busbar, thus increasing the effective lighting area of the battery sheet.

Example 3

As shown in Figures 3.1 to 3.2, it is a further improvement of Embodiment 2. A battery front bus bar 2 is provided on the front of the battery at the two ends of the battery and at the upper or lower end adjacent to the second end of the battery. , the two front busbars of the battery are electrically connected, and on the back of the battery, one busbar on the back of the battery is set at the end of the battery and the lower or upper end of the battery, respectively, and the two busbars on the back of the battery are electrically connected .

No matter using the battery slices of any of the above embodiments to form a crystalline silicon battery assembly, the adjacent battery slices are connected by stacking the end part 1 and the end part 2, that is, between the battery slices arranged in the same row. The end two of one battery slice is electrically connected to the end one of the second battery slice, and the connections between the battery slices are analogized in sequence. Connect the battery slices in series to form a battery pack for power supply. In order to increase the lighting area of the cells and reduce the length of the battery components, multiple rows of battery component strings connected in series by multiple cells can be set up, and the strings are connected in series by bus strips or welding strips.

Example 4

As shown in Figures 6.1 and 6.2, a battery front busbar 2 is provided on the front of the battery at the two ends of the battery, and on the back of the battery, it is located at the end of the battery and the lower and upper ends of the battery respectively. One busbar on the back of the cell, and three busbars on the back of the battery are electrically connected.

Example 5

As shown in Figures 7.1 and 7.2, a battery front bus bar 2 is provided on the front of the battery at the lower or upper end of the battery, and on the back of the battery, it is located at one end of the battery and two at the end of the battery, respectively. One main grid line on the back of the battery slice is provided, and the two main grid lines on the back of the battery slice are electrically connected.

Battery assembly embodiment A:

As shown in Figure 2.1-2.4 and Figure 4.2, the cells shown in Example 1 are selected, and the three cells are connected together by end-to-end stacking, and the two adjacent cells are connected by conductive tape 6. The ends are fixed and bonded to form battery component string 1, and then the battery component string 2 and battery component string 4 are formed in the same way, and the end 2 of the last battery piece of battery component string 1 is passed through the bus belt or welding ribbon. It is connected in series with the last battery piece of the battery module string 2, the end of the first battery piece of the battery module string 2 is connected in series with the first battery piece end 1 of the battery module string 3 through welding ribbon or bus belt, and the battery module string The end two of the last battery piece of the third battery is connected in series with the last battery piece of the battery module string four through the bus belt or the welding ribbon, and the end one of the first battery piece of the battery module string three is connected with the first battery piece of the battery module string four The ends of the battery slices are connected in series through welding strips or bus strips to form a battery assembly. The lead-out positive electrode of the battery component is formed by setting the welding strip or bus strip at the end of the first battery piece of the battery component string 1, and the lead-out of the battery component is formed by setting the welding strip or bus strip at the end of the first battery piece of the battery component string four. negative electrode. Of course, each cell can be placed horizontally or inclined.

Battery pack embodiment B:

As shown in Figures 1.1-1.4 and Figures 4 and 4.1, the battery sheet shown in Example 2 is selected, and the three battery sheets are connected together in a laminated manner, and the opposite main grid lines are bonded by conductive tape 6. Battery component string 1, and then use the same method to form battery component string 2 and battery component string 4. The last battery piece of the battery module string is connected in series, the first battery piece end of the battery module string two is connected in series with the first battery piece end one of the battery module The end two of the sheet is connected in series with the last battery sheet of the battery assembly string four through the bus belt or the welding ribbon, and the first battery sheet end one of the battery assembly string three is connected to the first battery sheet end one of the battery assembly string four. Ribbons or busbars are connected in series to form a battery assembly. The lead-out positive electrode of the battery component is formed by setting the welding strip or bus strip at the end of the first battery piece of the battery component string 1, and the lead-out of the battery component is formed by setting the welding strip or bus strip at the end of the first battery piece of the battery component string four. negative electrode. The bus strips or welding strips connect the battery assembly strings together in series through the corresponding main grid lines.

Battery assembly embodiment C;

Battery sheet embodiment 5 and battery sheet embodiment 4 are used in combination to form battery assembly embodiment C. As shown in Figure 8.1, the height of the battery sheet with the structure shown in Example 5 of the battery sheet is greater than that of the battery sheet with the structure shown in Example 4. Therefore, the battery sheet with the structure of Example 5 of the battery sheet is called an extension piece 15, The battery sheet with the structure shown in Example 4 is called a normal sheet 16 . Using the connection method of Example A, connect two ordinary sheets and one extended sheet in series to form battery module string 1, battery module string 2, battery module string 3, and battery module string 4, wherein the extended pieces are located at odd-numbered rows of battery module strings The tail end is located at the head end of the even-numbered battery assembly string. The upper end of the last battery slice of the battery assembly string 2 is stacked on the lower end of the extension piece at the end of the battery assembly string 1, and the lower end of the first extension piece of the battery assembly string 2 is stacked on the battery assembly string 3. Below the upper end of the ordinary sheet at the head end, the upper end of the last battery sheet of battery assembly string four is stacked on the lower end of the extended sheet at the end of battery assembly string three. All the other are with embodiment A.

Claims (10)

1. A crystalline silicon cell, comprising a crystalline silicon cell base (1) and being arranged on the back side of the cell base, as a metal back field of the positive electrode of the cell, on the front of the crystalline silicon cell base a plurality of secondary The grid lines are characterized in that the auxiliary grid lines do not intersect each other, the end one of each auxiliary grid line is arranged at one end of the battery sheet, and the end two of each auxiliary grid line is arranged at the end of the cell substrate In the second place, there is no main grid line on the front of the battery between the two ends of each auxiliary grid on the front of the battery, and no back of the battery is installed on the metal back field opposite to the two ends of the auxiliary grid. Busbar. 2. A crystalline silicon cell as claimed in claim 1, characterized in that no busbars are provided on the front and back sides of the cell substrate. 3. A crystalline silicon cell as claimed in claim 1, characterized in that at least one cell front busbar is arranged on the front of the cell substrate, and at least one busbar is arranged on the metal back field on the back of the cell substrate. The back busbar of the battery slice, the front busbar of the battery slice and the back busbar of the battery slice are located at the end of the battery slice and arranged along the edge of the battery slice. 4. A crystalline silicon cell as claimed in claim 3, characterized in that there is one main grid line on the front side of the cell, which is electrically connected to end one/end two of the auxiliary grid line, and the battery There is one main grid line on the back of the chip, which is located at the end two/end one of the auxiliary grid line. 5. A crystalline silicon cell as claimed in claim 3, characterized in that there are two busbars on the front side of the cell, which are intersected along two adjacent sides of the cell, and one of the front sides of the cell is The main grid line is electrically connected to the end one/end two of the auxiliary grid line; there are two main grid lines on the back of the battery sheet, which are arranged along the other two adjacent sides of the battery sheet. The gate lines are disposed corresponding to the end two/end one of the auxiliary gate lines. 6. A crystalline silicon cell as claimed in claim 3, characterized in that there is one main grid line on the front side of the cell, which is electrically connected to end one/end two of the auxiliary grid line, and the battery There are three main grid lines on the back of the cell, one of the main grid lines on the back of the cell is located at the end two/end one of the auxiliary grid line, and one end of the other two main grid lines on the back of the cell is respectively connected to the end of the auxiliary grid line. Two/one end is electrically connected to the corresponding end of the busbar on the back of the cell. 7. A crystalline silicon cell as shown in any one of claims 1-5, characterized in that, the auxiliary grid lines are arranged in parallel along the edge of the cell, and the main grid line on the front of the cell and the cell The rear main grid lines are arranged parallel to or perpendicular to the main grid lines. 8. A crystalline silicon battery assembly, comprising at least one group of battery assembly strings composed of at least two battery slices connected in series, and each battery assembly string is connected in series, characterized in that the battery assembly strings described in any one of claims 1-6 are used In each battery module string, two adjacent battery slices are superimposed and fixed by the metal back field of the battery slice corresponding to the end two of the sub-grid line of the front battery slice and the end of the sub-grid line of the rear battery slice electrically connected in series. 9. A crystalline silicon battery assembly as claimed in claim 8, wherein the two adjacent battery pieces are fixed and electrically connected by conductive tape or welding strip. 10. A crystalline silicon cell assembly as claimed in claim 8, wherein the photovoltaic cell assembly comprises at least two cell assembly strings, each cell assembly string is arranged side by side, and the head ends of two adjacent rows of cell assemblies Or the tail end is fixedly connected by a bus strip or a welding strip or a battery tape.