Solar cell module and voltage matching method and device thereof

Abstract

The invention discloses a solar cell module and a voltage matching method and device thereof. The voltage matching method comprises the following steps: determining the output voltage of a top cell; determining a target output voltage of the bottom battery according to the output voltage of the top battery; determining the width of each bottom sub-battery of the bottom battery according to the target output voltage of the bottom battery, the battery width of the bottom battery and the bottom sub-battery open voltage of each bottom sub-battery included in the bottom battery; wherein the bottom battery comprises a plurality of bottom sub-batteries which are connected in series; and determining the actual output voltage of the bottom battery according to the bottom sub-battery width of each bottom sub-battery, the battery width of the bottom battery and the bottom sub-battery open voltage of each bottom sub-battery included in the bottom battery, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is smaller than a preset value. The photoelectric conversion efficiency of the solar cell module can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to a solar cell assembly and a voltage matching method and device thereof. Background Art

[0002] In the development of most stacked batteries currently on the market, this structure is equivalent to a series connection. The main issue that needs to be considered is the limited size of the short-circuit current of the entire battery. To match the short-circuit currents of the upper and lower batteries, it is necessary to match the band gaps of the two to achieve a balance. The process is relatively complicated and the matching window is narrow.

[0003] There is another route, which is to use a stacked battery solution with two types of batteries mechanically stacked. Judging from the current open-circuit voltage of components of the same area, in order to physically match the voltage of the top battery, the size of the bottom battery must be connected in series with battery slices such as 6 or 7 or smaller pieces to achieve a voltage value similar to that of the top battery. In this way, the bottom battery will lose a lot of efficiency during the cutting process. Summary of the invention

[0004] The invention provides a solar cell assembly and a voltage matching method and device thereof, which can improve the photoelectric conversion efficiency of the solar cell assembly.

[0005] According to one aspect of the present invention, a voltage matching method for a solar cell assembly is provided. The solar cell assembly comprises: a bottom cell and a top cell stacked in sequence; the voltage matching method comprises:

[0006] Determine the output voltage of the top battery;

[0007] Determine the target output voltage of the bottom battery according to the output voltage of the top battery;

[0008] Determining a base cell width of each base cell of the base battery according to a target output voltage of the base battery, a cell width of the base battery, and a base cell opening voltage of each base cell included in the base battery; wherein the base battery includes a plurality of base cells connected in series;

[0009] The actual output voltage of the bottom battery is determined according to the bottom battery width of each bottom battery, the battery width of the bottom battery and the bottom battery opening voltage of each bottom battery included in the bottom battery, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

[0010] Optionally, the preset value is 10% of the output voltage of the top battery.

[0011] Optionally, the cell widths of the bottom cell and the top cell are the same.

[0012] Optionally, determining the base cell width of each base cell of the bottom battery according to the target output voltage of the bottom battery, the cell width of the bottom battery, and the base cell opening voltage of each base cell included in the bottom battery comprises:

[0013] Determining the number of basic batteries according to the target output voltage of the battery and the basic battery opening voltage of each basic battery included in the basic battery;

[0014] A base cell width of each base cell of the base cells is determined according to the number of base cells and the cell width of the base cells.

[0015] Optionally, the bottom battery includes a central region and a packaging region, the packaging region surrounds the central region, and the bottom battery is located in the central region;

[0016] Determining a base cell width of each base cell of the base cell according to the number of base cells and the cell width of the base cells, including:

[0017] The base cell width is determined according to the cell width of the base cell, the number of base cells and the preset size of the packaging area.

[0018] Optionally, determine the output voltage of the top battery, including:

[0019] The output voltage of the top battery is determined according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery; wherein the top battery includes a plurality of top sub-batteries connected in series.

[0020] Optionally, the top battery includes a central area and a packaging area, the packaging area surrounds the central area, and the top sub-batteries are all located in the central area;

[0021] The output voltage of the top battery is determined according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery, including:

[0022] Determine the number of top sub-cells according to the cell width of the top cell, the preset size of the packaging area and the width of the top sub-cell;

[0023] The output voltage of the top battery is determined according to the number of top batteries and the top battery opening voltage.

[0024] Optionally, the bottom cell is a copper indium gallium selenide cell; the copper indium gallium selenide cell comprises a first substrate, a back electrode, a copper indium gallium selenide absorption layer, a buffer layer and a third conductive layer which are stacked in sequence;

[0025] The top cell is a perovskite cell; the perovskite cell includes a second substrate, a first conductive layer, a first carrier transport layer, a perovskite absorption layer, a second carrier transport layer and a second conductive layer stacked in sequence; the second substrate is located on a side of the first conductive layer away from the first substrate.

[0026] According to another aspect of the present invention, a voltage matching device for a solar cell assembly is provided. The solar cell assembly comprises: a bottom cell and a top cell stacked in sequence; the voltage matching device comprises:

[0027] A first voltage determination module, used to determine the output voltage of the top battery;

[0028] A second voltage determination module, used to determine a target output voltage of the bottom battery according to the output voltage of the top battery;

[0029] a width determination module, used to determine the base cell width of each base cell of the base battery according to the target output voltage of the base battery, the cell width of the base battery and the base cell opening voltage of each base cell included in the base battery; wherein the base battery includes a plurality of base cells connected in series;

[0030] The third voltage determination module is used to determine the actual output voltage of the bottom battery according to the bottom battery width of each bottom battery, the battery width of the bottom battery and the bottom battery opening voltage of each bottom battery included in the bottom battery, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

[0031] According to another aspect of the present invention, there is provided a solar cell assembly, which is formed by using the voltage matching method described in any embodiment of the present invention and / or the voltage matching device described in any embodiment of the present invention.

[0032] The technical solution of the embodiment of the present invention provides a voltage matching method for a solar cell module, wherein the solar cell module includes: a bottom cell and a top cell stacked in sequence; the voltage matching method includes: determining the output voltage of the top cell; determining the target output voltage of the bottom cell according to the output voltage of the top cell; determining the base cell width of each base cell of the bottom cell according to the target output voltage of the bottom cell, the cell width of the bottom cell and the base cell opening voltage of each base cell included in the bottom cell; wherein the bottom cell includes a plurality of base cells connected in series; determining the actual output voltage of the bottom cell according to the base cell width of each base cell, the cell width of the bottom cell and the base cell opening voltage of each base cell included in the bottom cell, so that the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell is less than a preset value. The embodiment of the present invention can control the actual output voltage of the bottom cell by adjusting the base cell width of each base cell, so that the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell is less than a preset value, thereby matching the voltage of the bottom cell with that of the top cell, and improving the photoelectric conversion efficiency of the solar cell module. Because the voltage difference between the bottom cell and the top cell is not large, the photoelectric conversion efficiency will not be reduced due to the large voltage difference between the bottom cell and the top cell, thereby improving the photoelectric conversion efficiency of the solar cell module.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 The present invention provides a flow chart of a voltage matching method for a solar cell module.

[0036] Figure 2 It is a schematic structural diagram of a top battery provided by an embodiment of the present invention.

[0037] Figure 3 yes Figure 1 A detailed flow chart included in S130.

[0038] Figure 4 This is a flow chart of another voltage matching method for a solar cell assembly provided by an embodiment of the present invention.

[0039] Figure 5 It is a schematic diagram of a solar cell assembly provided by an embodiment of the present invention.

[0040] Figure 6 yes Figure 4 A detailed flow chart included in S210.

[0041] Figure 7 It is a schematic structural diagram of a solar cell assembly provided by an embodiment of the present invention.

[0042] Figure 8 It is a schematic diagram of a voltage matching device for a solar cell assembly provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0045] The embodiment of the present invention provides a voltage matching method for a solar cell assembly, wherein the solar cell assembly comprises: a bottom cell and a top cell stacked in sequence; Figure 1 is a flow chart of a voltage matching method for a solar cell module provided by an embodiment of the present invention, with reference to Figure 1 , voltage matching methods include:

[0046] S110, determining the output voltage of the top battery.

[0047] Among them, the top battery can be a perovskite battery, Figure 2 is a schematic diagram of the structure of a top battery provided by an embodiment of the present invention, referring to Figure 2 The top battery includes a plurality of top sub-batteries 10 connected in series, and the red arrow indicates a direction of current flow in the top sub-battery. The number of top sub-batteries included in the top battery can be determined based on the battery width of the top battery and the width Wp of the top sub-battery of each top sub-battery, and the output voltage of the top battery can be determined by multiplying the top sub-battery opening voltage of each top sub-battery by the number of top sub-batteries.

[0048] S120 , determining a target output voltage of the bottom battery according to the output voltage of the top battery.

[0049] Among them, the target output voltage of the bottom battery is the expected output voltage of the bottom battery determined according to the output voltage of the top battery. Since the voltages of the top battery and the bottom battery need to match to improve the photoelectric conversion efficiency of the solar cell module, the output voltage of the top battery can be set to be the same as the target output voltage of the bottom battery. However, due to subsequent packaging errors, the output voltage of the top battery may be different from the actual output voltage of the bottom battery. Therefore, it is necessary to subsequently adjust the error between the actual output voltage of the bottom battery and the output voltage of the top battery to be less than a preset value.

[0050] S130, determining a base cell width of each base cell of the bottom battery according to a target output voltage of the bottom battery, a cell width of the bottom battery, and a base cell opening voltage of each base cell included in the bottom battery; wherein the bottom battery includes a plurality of base cells connected in series.

[0051] Among them, the battery width of the bottom battery is the total width of the bottom battery, the bottom battery opening voltage of each bottom battery is the open circuit voltage of a single bottom battery, and the bottom battery width of each bottom battery is the single battery width of a single bottom battery.

[0052] Specifically, the battery width of the bottom battery can be set to W mm, the width of each bottom battery of the bottom battery can be set to Wc mm, and the bottom battery opening voltage of each bottom battery can be set to Vc; the number of bottom batteries can be determined according to the target output voltage of the battery and the bottom battery opening voltage Vc of each bottom battery, and the number of bottom batteries can be obtained by target output voltage / bottom battery opening voltage Vc; the bottom battery width Wc of each bottom battery of the bottom battery can be determined according to battery width W / number of bottom batteries, the output voltage of the top battery and the bottom battery opening voltage Vc of each bottom battery are determined, and the bottom battery width Wc of each bottom battery can be determined.

[0053] S140, determining an actual output voltage of the bottom battery according to a bottom battery width of each bottom battery, a battery width of the bottom battery, and a bottom battery opening voltage of each bottom battery included in the bottom battery, so that a voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

[0054] Among them, the actual output voltage of the bottom battery is the actual output voltage of the bottom battery under the current bottom battery width; the number of bottom batteries can be determined by the battery width W of the bottom battery / the base battery width Wc of each base battery, and the number of base batteries is a positive integer; and then the actual output voltage of the bottom battery can be obtained by multiplying the base battery opening voltage Vc of each base battery by the number of base batteries = Vc*(W / Wc); therefore, the actual output voltage of the bottom battery can be controlled by adjusting the base battery width of each base battery, so that the actual output voltage of the bottom battery is equal to the output voltage of the top battery. The voltage difference is smaller than the preset value, so that the voltages of the bottom cell and the top cell are matched. Because the voltage difference between the bottom cell and the top cell is not large, the photoelectric conversion efficiency will not be reduced due to the large voltage difference between the bottom cell and the top cell, thereby improving the photoelectric conversion efficiency of the solar cell module; it avoids the use of 6-slice or 7-slice or smaller cell slices to be connected in series to achieve a voltage value similar to that of the top cell, and avoids the loss of efficiency of the bottom cell during the cutting process, resulting in poor welding, hidden cracks and low yield of subsequent cell slices. The operation is simple and can reduce the manufacturing cost.

[0055] The technical solution of the embodiment of the present invention provides a voltage matching method for a solar cell module, wherein the solar cell module includes: a bottom cell and a top cell stacked in sequence; the voltage matching method includes: determining the output voltage of the top cell; determining the target output voltage of the bottom cell according to the output voltage of the top cell; determining the base cell width of each base cell of the bottom cell according to the target output voltage of the bottom cell, the cell width of the bottom cell and the base cell opening voltage of each base cell included in the bottom cell; wherein the bottom cell includes a plurality of base cells connected in series; determining the actual output voltage of the bottom cell according to the base cell width of each base cell, the cell width of the bottom cell and the base cell opening voltage of each base cell included in the bottom cell, so that the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell is less than a preset value. The embodiment of the present invention can control the actual output voltage of the bottom cell by adjusting the base cell width of each base cell, so that the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell is less than a preset value, thereby matching the voltage of the bottom cell with that of the top cell. Because the voltage difference between the bottom cell and the top cell is not large, the photoelectric conversion efficiency will not be reduced due to the large voltage difference between the bottom cell and the top cell, thereby improving the photoelectric conversion efficiency of the solar cell module.

[0056] Optionally, the preset value is 10% of the output voltage of the top battery.

[0057] Among them, due to the precise selection of the width of the engraved line of the bottom cell and the top cell, the voltage of the top cell and the bottom cell cannot be exactly the same. By adjusting the width of the bottom cell base cell to adjust the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell to be less than 10% of the output voltage of the top cell, the stability of the solar cell module can be maintained and the performance of the solar cell module can be improved.

[0058] Optionally, the cell widths of the bottom cell and the top cell are the same.

[0059] Among them, setting the battery width of the bottom battery and the top battery to be the same can facilitate calculation and simplify the calculation process.

[0060] Optional, Figure 3 yes Figure 1 A detailed flow chart of S130 in FIG. Figure 3 S130, determining the base cell width of each base cell of the base cell according to the target output voltage of the base cell, the cell width of the base cell and the base cell opening voltage of each base cell included in the base cell, including:

[0061] S131 , determining the number of basic batteries according to the target output voltage of the battery and the basic battery opening voltage of each basic battery included in the basic battery.

[0062] Among them, since the basic batteries are connected in series with each other, the voltage of each basic battery is the same, so the number of basic batteries can be obtained by target output voltage / basic battery opening voltage, and the number of basic batteries including the basic battery opening voltage in the target output voltage is the number of basic batteries.

[0063] S132, determining a base cell width of each base cell of the base cells according to the number of base cells and the cell width of the base cells.

[0064] Among them, the base cell width of each base cell of the bottom battery is determined according to the cell width / the number of base cells, and the actual output voltage of the bottom battery is subsequently determined by the obtained base cell width, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value. Therefore, the voltage difference between the bottom battery and the top battery is not much, and the photoelectric conversion efficiency will not be reduced due to the large voltage difference between the bottom battery and the top battery, thereby improving the photoelectric conversion efficiency of the solar cell module.

[0065] Optionally, the bottom battery includes a central area and a packaging area, the packaging area surrounds the central area, and the bottom battery is located in the central area; determining the bottom battery width of each bottom battery of the bottom battery according to the number of bottom batteries and the battery width of the bottom batteries, including: determining the bottom battery width according to the battery width of the bottom battery, the number of bottom batteries and a preset size of the packaging area.

[0066] Among them, the battery width of the bottom battery is the total width of the bottom battery, and the total width of the bottom battery includes the total width of multiple bottom batteries and the width of the packaging area; the bottom battery adopts an internal series structure, and the bottom battery includes multiple bottom batteries connected in series. Exemplarily, a reserved size of 10mm is provided around the packaging area, and the reserved size is the size from the outer edge of the packaging area away from the central area to the central area; assuming that the opening voltage of a single bottom battery is Vc, and the width of a single bottom battery is Wc millimeters, since the bottom battery is located in the central area and the packaging area surrounds the central area, the total base battery width in the central area is W-10*2, therefore, the number of base batteries = (W-10*2) / Wc, and the base battery width Wc can be obtained by substituting the battery width of the bottom battery, the number of base batteries and the preset size of the packaging area, and the actual output voltage of the bottom battery can be determined as Vc*(W-10*2) / Wc later.

[0067] Optional, Figure 4 is a flow chart of another voltage matching method for a solar cell module provided by an embodiment of the present invention, with reference to Figure 4 , voltage matching methods include:

[0068] S210, determining the output voltage of the top battery according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery; wherein the top battery includes a plurality of top sub-batteries connected in series.

[0069] Among them, the battery width of the top battery is the total width of the top battery, the top sub-battery opening voltage of each top sub-battery is the open circuit voltage of a single top sub-battery, and the top sub-battery width of each top sub-battery is the single battery width of a single top sub-battery.

[0070] Specifically, Figure 5 is a schematic diagram of a solar cell assembly provided by an embodiment of the present invention, with reference to Figure 5 , the black arrow indicates that the light enters from the top battery 10. If the battery widths of the bottom battery 20 and the top battery 10 are set to be the same, the battery width of the top battery 10 can be set to W mm; the width of each top sub-battery of the top battery 10 is Wp mm, and the top sub-battery opening voltage of each top sub-battery is Vp; the number of top sub-batteries can be determined according to the battery width W of the top battery 10 / the top sub-battery width Wp of each top sub-battery, and the output voltage of the top battery 10 is obtained by multiplying the number of top sub-batteries by the top sub-battery opening voltage Vp.

[0071] S220 , determining a target output voltage of the bottom battery according to the output voltage of the top battery.

[0072] S230, determining a base cell width of each base cell of the bottom battery according to a target output voltage of the bottom battery, a cell width of the bottom battery, and a base cell opening voltage of each base cell included in the bottom battery; wherein the bottom battery includes a plurality of base cells connected in series.

[0073] S240, determining an actual output voltage of the bottom battery according to a bottom battery width of each bottom battery, a battery width of the bottom battery, and a bottom battery opening voltage of each bottom battery included in the bottom battery, so that a voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

[0074] Among them, S220-S240 are the same as S120-S140 and have the same beneficial effects.

[0075] Optionally, the top battery includes a central area and a packaging area, the packaging area surrounds the central area, and the top sub-batteries are all located in the central area; Figure 6 yes Figure 4 A detailed flow chart of S210 included in Figure 6 S210, determining the output voltage of the top battery according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery, including:

[0076] S211, determining the number of top sub-batteries according to the battery width of the top battery, the preset size of the packaging area, and the width of the top sub-battery.

[0077] Among them, the battery width of the top battery is the total width of the top battery, and the total width of the top battery includes the total width of multiple top sub-batteries and the width of the packaging area; the top battery adopts an internal series structure, and the top battery includes multiple top sub-batteries connected in series. Exemplarily, a 10mm size is reserved around the packaging area, and the reserved size is the size of the outer edge of the packaging area away from the central area pointing to the central area; assuming that the opening voltage of a single top sub-battery is Vp, the width of a single top sub-battery is Wp millimeters, the laser engraving line is etched along the length direction of the battery, and the number of top sub-batteries = (W-10*2) / Wp.

[0078] S212, determining the output voltage of the top battery according to the number of top batteries and the top battery opening voltage.

[0079] Among them, the output voltage of the top cell is Vp*(W-10*2) / Wp; when the voltage of the bottom cell and the top cell matches, Vp*(W-10*2) / Wp=Vc*(W-10*2) / Wc, that is, Vp / Wp=Vc / Wc, that is, for the solar cell module, the voltage matching is the ratio of the opening voltage and width of a single top cell to the opening voltage and width of a single bottom cell; assuming that the opening voltage of the top cell is 1.1V, the width of the top cell is 5mm, and the bottom cell is The base cell opening voltage of the battery is 0.7V, so the base cell width is 0.7*5 / 1.1=3.18mm, which is approximately 3mm. Subsequently, the actual output voltage of the bottom cell is obtained by multiplying the base cell width by the number of base cells by the base cell opening voltage, so that the actual output voltage of the bottom cell matches the output voltage of the top cell, and the voltage difference between the actual output voltage of the bottom cell and the output voltage of the top cell is less than 10% of the output voltage of the top cell, which can maintain the stability of the solar cell module and improve the performance of the solar cell module.

[0080] Optional, Figure 7 is a schematic diagram of the structure of a solar cell assembly provided by an embodiment of the present invention, with reference to Figure 7 The bottom cell 20 is a copper indium gallium selenide cell; the copper indium gallium selenide cell includes a first substrate 21, a back electrode 22, a copper indium gallium selenide absorption layer 23, a buffer layer 24 and a third conductive layer 25 stacked in sequence; the top cell 10 is a perovskite cell; the perovskite cell includes a second substrate 11, a first conductive layer 12, a first carrier transport layer 13, a perovskite absorption layer 14, a second carrier transport layer 15 and a second conductive layer 16 stacked in sequence; the second substrate 11 is located on the side of the first conductive layer 12 away from the first substrate 21.

[0081] Among them, the top cell 10 and the bottom cell 20 are packaged by a glue layer 30; the bottom cell 20 is a copper indium gallium selenide cell, with a maximum efficiency of nearly 24%, and the top cell 10 is a perovskite cell, with a maximum efficiency of 26.1%. Both the perovskite cell and the copper indium gallium selenide cell are thin-film cells, and the perovskite cell and the copper indium gallium selenide cell are packaged in the same large area, the perovskite cell is used as the incident light receiving layer, and the copper indium gallium selenide cell is packaged at the bottom; during packaging, only one layer of glue film 30 is used in the middle, and the two cells complement each other and are packaged into a component. The solar cell component is a two-terminal stacked solar cell component in which the bottom cell 20 is a copper indium gallium selenide cell and the top cell 10 is a perovskite cell, which can simultaneously maintain a stacking structure of solar cell layers with two different characteristics, can improve the photoelectric conversion efficiency of the solar cell component, and the preparation method is simple, which can reduce the manufacturing cost.

[0082] The embodiment of the present invention provides a voltage matching device for a solar cell assembly based on the above embodiment. The solar cell assembly includes: a bottom cell and a top cell stacked in sequence.

[0083] Figure 8 is a schematic diagram of a voltage matching device for a solar cell assembly provided by an embodiment of the present invention, with reference to Figure 8 , the voltage matching device comprises:

[0084] A first voltage determination module 310, for determining an output voltage of a top battery;

[0085] A second voltage determination module 320, for determining a target output voltage of the bottom battery according to the output voltage of the top battery;

[0086] A width determination module 330, configured to determine a base cell width of each base cell of the base battery according to a target output voltage of the base battery, a cell width of the base battery, and a base cell opening voltage of each base cell included in the base battery; wherein the base battery includes a plurality of base cells connected in series;

[0087] The third voltage determination module 340 is used to determine the actual output voltage of the bottom battery according to the bottom battery width of each bottom battery, the battery width of the bottom battery and the bottom battery opening voltage of each bottom battery included in the bottom battery, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

[0088] Optionally, the preset value is 10% of the output voltage of the top battery.

[0089] Optionally, the cell widths of the bottom cell and the top cell are the same.

[0090] Optionally, a width determination module, including:

[0091] A quantity determination submodule, used to determine the quantity of the basic battery according to the target output voltage of the battery and the basic battery opening voltage of each basic battery included in the basic battery;

[0092] The width determination submodule is used to determine the base cell width of each base cell of the base cells according to the number of base cells and the cell width of the base cells.

[0093] Optionally, the bottom battery includes a central area and a packaging area, the packaging area surrounds the central area, and the bottom battery is located in the central area; the width determination submodule includes:

[0094] The width determination unit is used to determine the base battery width according to the battery width of the base battery, the number of base sub-batteries and the preset size of the packaging area.

[0095] Optionally, the first voltage determination module includes:

[0096] The first voltage determination submodule is used to determine the output voltage of the top battery according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery and the top sub-battery opening voltage of each top sub-battery; wherein the top battery includes a plurality of top sub-batteries connected in series.

[0097] Optionally, the top battery includes a central area and a packaging area, the packaging area surrounds the central area, and the top sub-batteries are all located in the central area;

[0098] The first voltage determination submodule includes:

[0099] A quantity determination unit, used to determine the number of top sub-batteries according to the battery width of the top battery, the preset size of the packaging area and the width of the top sub-battery;

[0100] The voltage determination unit is used to determine the output voltage of the top battery according to the number of the top batteries and the top battery opening voltage.

[0101] Optionally, the bottom cell is a copper indium gallium selenide cell; the copper indium gallium selenide cell includes a first substrate, a back electrode, a copper indium gallium selenide absorption layer, a buffer layer and a third conductive layer stacked in sequence; the top cell is a perovskite cell; the perovskite cell includes a second substrate, a first conductive layer, a first carrier transport layer, a perovskite absorption layer, a second carrier transport layer and a second conductive layer stacked in sequence; the second substrate is located on the side of the first conductive layer away from the first substrate.

[0102] The voltage matching device of the solar cell module provided in the embodiment of the present invention has the same beneficial effects as the voltage matching method of the solar cell module described in any embodiment of the present invention.

[0103] The embodiment of the present invention further provides a solar cell assembly based on the above embodiment, which is formed by the voltage matching method described in any embodiment of the present invention and / or the voltage matching device described in any embodiment of the present invention.

[0104] A solar cell assembly provided by an embodiment of the present invention has the same beneficial effects as the voltage matching method described in any embodiment of the present invention and / or the voltage matching device described in any embodiment of the present invention.

[0105] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage matching method for a solar cell module, characterized in that: The solar cell assembly comprises: a bottom cell and a top cell stacked in sequence; the voltage matching method comprises: Determine the output voltage of the top battery; Determine the target output voltage of the bottom battery according to the output voltage of the top battery; Determining the base cell width of each base cell of the base battery according to the target output voltage of the base battery, the cell width of the base battery and the base cell opening voltage of each base cell included in the base battery; wherein the base battery includes a plurality of base cells connected in series; The actual output voltage of the bottom battery is determined according to the bottom battery width of each bottom battery, the battery width of the bottom battery and the bottom battery opening voltage of each bottom battery included in the bottom battery, so that the voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

2. The voltage matching method according to claim 1, characterized in that: The preset value is 10% of the output voltage of the top battery.

3. The voltage matching method according to claim 1, characterized in that: The bottom cell and the top cell have the same cell width.

4. The voltage matching method according to claim 1, characterized in that: Determining the base cell width of each base cell of the base cell according to the target output voltage of the base cell, the cell width of the base cell and the base cell opening voltage of each base cell included in the base cell comprises: Determining the number of the base batteries according to the target output voltage of the battery and the base battery opening voltage of each base battery included in the base battery; A base cell width of each base cell of the base cells is determined according to the number of the base cells and the cell width of the base cells.

5. The voltage matching method according to claim 4, characterized in that: The bottom battery comprises a central area and a packaging area, the packaging area surrounds the central area, and the bottom battery is located in the central area; Determining the base cell width of each base cell of the base cells according to the number of the base cells and the cell width of the base cells comprises: The base cell width is determined according to the cell width of the base cell, the number of the base cells and the preset size of the packaging area.

6. The voltage matching method according to claim 1, characterized in that: Determine the output voltage of the top battery, including: The output voltage of the top battery is determined according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery; wherein the top battery includes a plurality of top sub-batteries connected in series.

7. The voltage matching method according to claim 6, characterized in that: The top battery comprises a central area and a packaging area, the packaging area surrounds the central area, and the top sub-batteries are all located in the central area; Determining the output voltage of the top battery according to the battery width of the top battery, the top sub-battery width of each top sub-battery of the top battery, and the top sub-battery opening voltage of each top sub-battery, comprises: Determine the number of the top sub-batteries according to the battery width of the top battery, the preset size of the packaging area and the width of the top sub-battery; The output voltage of the top battery is determined according to the number of the top sub-batteries and the top sub-battery opening voltage.

8. The voltage matching method according to claim 1, characterized in that: The bottom cell is a copper indium gallium selenide cell; the copper indium gallium selenide cell comprises a first substrate, a back electrode, a copper indium gallium selenide absorption layer, a buffer layer and a third conductive layer which are stacked in sequence; The top cell is a perovskite cell; the perovskite cell comprises a second substrate, a first conductive layer, a first carrier transport layer, a perovskite absorption layer, a second carrier transport layer and a second conductive layer stacked in sequence; the second substrate is located on a side of the first conductive layer away from the first substrate.

9. A voltage matching device for a solar cell module, characterized in that: The solar cell assembly comprises: a bottom cell and a top cell stacked in sequence; The voltage matching device comprises: A first voltage determination module, used to determine the output voltage of the top battery; A second voltage determination module, used to determine a target output voltage of the bottom battery according to the output voltage of the top battery; a width determination module, configured to determine a base cell width of each base cell of the base cell according to a target output voltage of the base cell, a cell width of the base cell, and a base cell opening voltage of each base cell included in the base cell; wherein the base cell includes a plurality of base cells connected in series; a third voltage determination module, configured to determine an actual output voltage of the bottom battery according to a bottom battery width of each bottom battery, a battery width of the bottom battery, and a bottom battery opening voltage of each bottom battery included in the bottom battery, so that a voltage difference between the actual output voltage of the bottom battery and the output voltage of the top battery is less than a preset value.

10. A solar cell module, characterized in that: It is formed by the voltage matching method described in any one of claims 1 to 8 and / or the voltage matching device described in claim 9.

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