Solar cell electrode, solar cell and photovoltaic module

Abstract

The present application relates to the field of photovoltaics, and discloses a photovoltaic module and a preparation method therefor. The photovoltaic module comprises: a first cell string group, a second cell string group and a plurality of middle connecting pieces arranged between the first cell string group and the second cell string group; the first cell string group and the second cell string group each comprise a plurality of cell strings arranged at intervals in a first direction; a first electrode and a second electrode which are sequentially and alternately arranged in the first direction are arranged on an end cell of each cell string close to one end of the corresponding middle connecting piece; first electrodes on end cells in a first cell string and a third cell string are connected to a same middle connecting piece; second cells on end cells in a second cell string and a fourth cell string are connected to another adjacent middle connecting pieces; the angles of cells are all right angles; or, the chamfered parts of the cells are provided with chamfered edges, and the chamfered edges of two adjacent cells in the first direction correspond to each other. The present application can improve the flexibility of structural design of the photovoltaic module.

Description

Solar cell electrodes, solar cells and photovoltaic modules

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 20, 2024, with application number 202410323935.7 and invention name “A photovoltaic module and its preparation method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of photovoltaic technology, and specifically relates to a photovoltaic module and a preparation method thereof. Background Art

[0003] An interdigitated back contact (IBC) crystalline silicon solar cell refers to a solar cell structure in which the positive and negative metal electrodes are arranged in an interdigitated manner on the backlight side of the cell, and the PN junction and electrodes are located on the backside of the cell. That is, the electrodes of the emitter and base regions of the IBC cell are both on the backside, and there is no grid line blocking the front side, which can improve the photoelectric conversion performance of the cell.

[0004] In the related art, the photovoltaic module manufacturing process is to arrange multiple cells according to a specific structure to form a cell string. These cell strings are then connected to a central bus bar and two side bus bars. Lead wires connected to the ends of the central bus bar then lead the current collected by the cell grid lines out of the photovoltaic module. However, the cell layout in existing photovoltaic modules is limited by the size of the space, and there is a risk of contact short circuits between the lead wires. In addition, during the lamination process, the chamfered corners of the cell are subject to uneven stress, which may cause the cell to crack or break. Summary of the Invention

[0005] This application aims to provide a photovoltaic module and its preparation method, which can partially or completely solve the problems in existing photovoltaic modules, such as the limited space for cell layout, the risk of contact short circuits between lead wires, and the risk of local uneven force on the chamfered corners of the cell during the lamination process, which may lead to hidden cracks or breakage of the cell. To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application provides a photovoltaic module, comprising: a first battery string group, a second battery string group, and a plurality of intermediate connectors disposed between the first battery string group and the second battery string group, wherein the plurality of intermediate connectors are arranged at intervals along a first direction; the first battery string group and the second battery string group each comprise a plurality of battery strings arranged sequentially at intervals along the first direction;

[0007] The battery string includes a plurality of battery cells spaced apart and arranged along the second direction; the battery cell at the end of the battery string near one end of the intermediate connector is provided with first electrodes and second electrodes alternately arranged in sequence along the first direction;

[0008] The first battery string group includes a first battery string and a second battery string alternately arranged along the first direction, and the second battery string group includes a third battery string and a fourth battery string alternately arranged along the first direction; the first electrodes on the end battery cells in the first battery string and the third battery string are connected to the same intermediate connector; the second electrodes on the end battery cells in the second battery string and the fourth battery string are connected to another adjacent intermediate connector;

[0009] The corners of the battery cells are all right angles; or, the corners of the battery cells include chamfered portions, the chamfered portions are provided with chamfered edges, and the chamfered edges of two adjacent battery cells along the first direction are located at corresponding positions.

[0010] Optionally, in a case where the chamfered portion of the battery cell is provided with a chamfered edge, the chamfered edges of two adjacent battery cells along the first direction are arranged opposite to each other or away from each other in the second direction.

[0011] Optionally, a preset angle is formed between the chamfered edges of two adjacent battery cells along the first direction.

[0012] Optionally, the preset angle ranges from 30° to 150°.

[0013] Optionally, when all corners of the battery cells are right angles, along the first direction, right-angled sides of corresponding right angles in two adjacent battery cells are parallel to each other.

[0014] Optionally, the electrode arrangement structures on two adjacent battery cells along the first direction are the same, and the electrode arrangement structures on two adjacent battery cells in the battery string along the second direction are opposite.

[0015] Optionally, the battery string is further provided with an electrical connector, which is connected to the first electrode of one of the battery cells and the second electrode of another adjacent battery cell; or, the electrical connector is connected to the second electrode of one of the battery cells and the first electrode of another adjacent battery cell.

[0016] Optionally, when the chamfered portion of the battery cell is provided with a chamfered edge, the electrical connector is staggered with the chamfered edge.

[0017] Optionally, a distance D between an electrical connector connected to the first electrode or the second electrode at the upper edge of the battery cell along the first direction and the corresponding chamfered edge satisfies the following: 0<D≤12 mm.

[0018] Optionally, the first electrodes on the end battery cells in the first battery string and the third battery string are both connected to the same intermediate connector through an electrical connector; and / or, the second electrodes on the end battery cells in the second battery string and the fourth battery string are both connected to another adjacent intermediate connector through an electrical connector.

[0019] Optionally, the conductivity type of the first electrode is opposite to that of the second electrode; and / or, the two adjacent battery cells in the battery string are rotationally symmetrical along the second direction; and / or, the battery cell is a sliced ​​battery cell; and / or, the battery cell is a back-contact solar cell; and / or, the first electrode and the second electrode include at least one of a metal main grid line and a pad; and / or, the number of the first electrode and the second electrode on the battery cell is equal.

[0020] In a second aspect, the present application proposes a method for preparing a photovoltaic module, which is used to prepare any of the above-mentioned photovoltaic modules, comprising:

[0021] Providing a battery cell, wherein all corners of the battery cell are right angles; or, the battery cell includes a chamfered portion, and the chamfered portion is provided with a chamfered edge;

[0022] A first battery string group and a second battery string group are prepared; each of the first battery string group and the second battery string group includes a plurality of battery strings spaced apart and arranged along a first direction; the battery strings include a plurality of battery cells spaced apart and connected along a second direction; the end battery cells at at least one end of the battery strings are provided with first electrodes and second electrodes alternately arranged along the first direction; if the chamfered portions of the battery cells are provided with chamfered edges, the chamfered edges of two adjacent battery cells along the first direction are arranged to correspond to each other;

[0023] The first battery string group and the second battery string group are connected by an intermediate connector; the first battery string group includes a first battery string and a second battery string arranged alternately along the first direction, and the second battery string group includes a third battery string and a fourth battery string arranged alternately along the first direction; the first electrodes on the end battery cells in the first battery string and the third battery string are connected to the same intermediate connector; the second electrodes on the end battery cells in the second battery string and the fourth battery string are connected to another intermediate connector.

[0024] Optionally, the preparing the first battery string group and the second battery string group includes: arranging and connecting a plurality of the battery cells to form a first battery string and a second battery string, respectively, and arranging a plurality of the first battery strings and the second battery strings along the first direction to form the first battery string group; arranging and connecting a plurality of the battery cells to form a third battery string and a fourth battery string, respectively; and arranging a plurality of the third battery strings and the fourth battery strings along the first direction to form the second battery string group;

[0025] Alternatively, the preparation of the first battery string group and the second battery string group includes: arranging and connecting a plurality of the battery cells to form a first battery string and a third battery string, respectively, and arranging the first battery string and the third battery string along the second direction; arranging and connecting a plurality of the battery cells to form a second battery string and a fourth battery string, respectively, and arranging the second battery string and the fourth battery string along the second direction, and after arranging them alternately multiple times along the first direction, arranging them simultaneously along the first direction to form the first battery string group and the second battery string group.

[0026] Optionally, the plurality of battery cells include a first battery cell and a second battery cell, and the electrode arrangement structures on the first battery cell and the second battery cell are opposite; the first battery cell is provided with a first electrode and a second electrode arranged alternately along the first direction, and the second battery cell is provided with a second electrode and a first electrode arranged alternately along the first direction.

[0027] Optionally, the number of battery cells in each battery string is an odd number or an even number.

[0028] In the present application, by setting the composition structure of the battery string in the photovoltaic module and the layout structure of multiple battery cells, the first electrodes on the end battery cells in the first battery string and the third battery string are connected to the same intermediate connector, and the second electrodes on the end battery cells in the second battery string and the fourth battery string are connected to another adjacent intermediate connector. As a result, there can be sufficient space between the two adjacent intermediate connectors for setting lead wires, so as to ensure that there is a large spacing between the lead wires, thereby avoiding the lead wires contacting each other and causing short circuit problems.

[0029] Furthermore, by setting all corners of the cell to right angles, or by providing chamfered edges on the chamfered corners of the cell, and aligning the chamfered edges of two adjacent cell sheets along the first direction, the regularity of the cell layout can be improved, which not only enhances the aesthetics, but also, during the hot pressing process of the photovoltaic module, the flow of the adhesive film material can make the impact force on the chamfered corners of two adjacent cell sheets more balanced, thereby reducing the risk of hidden cracks or ruptures in the chamfered corners of the cell sheets due to uneven force.

[0030] In addition, by adopting the cell layout structure provided in the present application, a certain space can be reserved at the ends of two adjacent intermediate connectors close to each other, which can be used to connect the jumper bus bars to meet the cross-distance connection requirements between cell strings, thereby improving the flexibility of photovoltaic module structure and circuit design.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] FIG1 is a schematic diagram of a photovoltaic module according to an embodiment of the present application;

[0034] FIG2 is a schematic diagram of a first battery cell and a second battery cell according to an embodiment of the present application;

[0035] FIG3 is a schematic diagram of the arrangement of multiple battery cells according to an embodiment of the present application;

[0036] FIG4 is a schematic diagram of preparing a first battery string when the number of battery cells is odd according to an embodiment of the present application;

[0037] FIG5 a is a schematic diagram showing a preparation method of a second battery string when the number of battery cells is odd according to an embodiment of the present application;

[0038] FIG5 b is a schematic diagram of another preparation method of a second battery string when the number of battery cells is odd according to an embodiment of the present application;

[0039] FIG6 is a schematic diagram of preparing a third battery string when the number of battery cells is odd according to an embodiment of the present application;

[0040] FIG7 a is a schematic diagram of preparing a fourth battery string when the number of battery cells is odd according to an embodiment of the present application;

[0041] FIG7 b is a schematic diagram of another preparation method of a fourth battery string when the number of battery cells is odd according to an embodiment of the present application;

[0042] FIG8 is a schematic diagram of another photovoltaic assembly according to an embodiment of the present application;

[0043] FIG9 is a schematic diagram of preparing a first battery string when the number of battery cells is even according to an embodiment of the present application;

[0044] FIG10 is a schematic diagram of preparing a second battery string when the number of battery cells is even according to an embodiment of the present application;

[0045] FIG11 is a schematic diagram of preparing a third battery string when the number of battery cells is even according to an embodiment of the present application;

[0046] FIG12 is a schematic diagram of preparing a fourth battery string when the number of battery cells is even according to an embodiment of the present application;

[0047] FIG13 is a flow chart of a method for preparing a photovoltaic module according to an embodiment of the present application.

[0048] Figure numerals: 11: first battery string group; 12: second battery string group; 111: first battery string; 112: second battery string; 113: third battery string; 114: fourth battery string; 120: battery cell; 120a: end battery cell; 1201: chamfered edge; 121: first battery cell; 122: second battery cell; 131: first electrode; 132: second electrode; 13: intermediate connector; 14: electrical connector; X: first direction; Y: second direction. Specific embodiments

[0049] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0053] The photovoltaic module and the preparation method thereof provided in the embodiments of the present application are described in detail below with reference to specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0054] As shown in Figures 1 to 3, according to some embodiments of the present application, a photovoltaic module includes: a first battery string group 11, a second battery string group 12, and a plurality of intermediate connectors provided between the first battery string group 11 and the second battery string group 12, wherein the plurality of intermediate connectors are arranged at intervals along a first direction X; the first battery string group 11 and the second battery string group 12 each include a plurality of battery strings arranged at intervals along the first direction X; the battery string includes a plurality of battery cells 120 arranged at intervals along a second direction Y; and the end battery cell 120a of the battery string near one end of the intermediate connector 13 is provided with a first electrode 131 and a second electrode 132 arranged alternately in sequence along the first direction X.

[0055] Furthermore, a first battery string group 11 is provided including a first battery string 111 and a second battery string 112 alternately arranged along a first direction X, and a second battery string group 12 includes a third battery string 113 and a fourth battery string 114 alternately arranged along the first direction X; the first electrodes 131 on the end battery cells 120a in the first battery string 111 and the third battery string 113 are connected to the same intermediate connector 13; the second electrodes 132 on the end battery cells 120a in the second battery string 112 and the fourth battery string 114 are connected to another adjacent intermediate connector; the corners of the battery cells 120 are all right angles; or, the corners of the battery cells 120 include chamfered portions, the chamfered portions are provided with chamfered edges 1201, and the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are located at corresponding positions.

[0056] In the embodiment of the present application, by setting the composition structure of the battery string in the photovoltaic module and the layout structure of the multiple battery cells 120, the first electrode 131 on the end battery cell 120a in the first battery string 111 and the third battery string 113 is connected to the same intermediate connector 13, and the second electrode 132 on the end battery cell 120a in the second battery string 112 and the fourth battery string 114 is connected to another adjacent intermediate connector. As a result, there can be sufficient space between the two adjacent intermediate connectors for setting the lead wires, so as to ensure that there is a large spacing between the lead wires, thereby avoiding the lead wires contacting each other and causing a short circuit problem.

[0057] Furthermore, by setting all corners of the cell 120 to be right angles, or by setting chamfered edges 1201 on the chamfered portions of the cell 120, and arranging the chamfered edges 1201 of two adjacent cell 120 along the first direction X to correspond to each other, the regularity of the cell arrangement structure can be improved, which not only enhances the aesthetics, but also, during the hot pressing process of the photovoltaic module, the flow of the adhesive film material can make the impact force on the chamfered portions of the two adjacent cell 120 more balanced, thereby reducing the risk of hidden cracks or ruptures in the chamfered portions of the cell 120 due to uneven force.

[0058] In addition, by adopting the battery cell 120 layout structure provided in the embodiment of the present application, a certain space can be reserved at the ends of two adjacent intermediate connectors close to each other for connecting the jumper bus bars to meet the cross-distance connection requirements between battery strings, thereby improving the flexibility of photovoltaic module circuit design.

[0059] It is understood that the photovoltaic assembly includes an intersecting first direction X and a second direction Y. Preferably, the first direction X and the second direction Y are perpendicular to each other. The photovoltaic assembly includes a first battery string group 11 and a second battery string group 12 spaced apart along the second direction Y. A plurality of intermediate connectors spaced apart along the first direction X are provided between the first battery string group 11 and the second battery string group 12. The intermediate connectors extend along the first direction X and may be bus bars.

[0060] Specifically, the first battery string group 11 and the second battery string group 12 each include a plurality of battery strings spaced apart along a first direction X. Furthermore, at least one intermediate connector is used to connect the corresponding battery strings in the first battery string group 11 and the second battery string group 12, respectively, to form a photovoltaic module. Each battery string includes a plurality of battery cells 120 spaced apart along a second direction Y and connected in sequence.

[0061] Furthermore, the first battery string group 11 includes first battery strings 111 and second battery strings 112 arranged alternately along the first direction X, and the second battery string group 12 includes third battery strings 113 and fourth battery strings 114 arranged alternately along the first direction X. The first battery string 111 and the third battery string 113 are arranged opposite each other along the second direction Y, and are connected by an intermediate connector 13; the second battery string 112 and the fourth battery string 114 are arranged opposite each other along the second direction Y, and are connected by another intermediate connector.

[0062] Specifically, the battery cell 120 near one end of the intermediate connector 13 in the first battery string 111, the second battery string 112, the third battery string 113, and the fourth battery string 114 is set as an end battery cell 120a, and the end battery cell 120a is provided with a first electrode 131 and a second electrode 132 arranged alternately in sequence along the first direction X.

[0063] For example, as shown in FIG1 , the first direction X is set to be from left to right, and the second direction Y is set to be from top to bottom. Specifically, a battery string near the left edge of the first battery string group 11 is a first battery string 111, and the battery string adjacent to the right of the first battery string 111 is a second battery string 112. Furthermore, along the left-to-right direction (i.e., the first direction X), the first battery string 111 and the second battery string 112 are arranged alternately. The end battery cells 120a of the first battery string 111 and the second battery string 112 near one end of the intermediate connector 13 are provided with first electrodes 131 and second electrodes 132 arranged alternately from left to right (i.e., the first direction X).

[0064] Correspondingly, the cell string near the left edge of the second cell string group 12 is a third cell string 113. A fourth cell string 114 is provided to the right of the third cell string 113. Furthermore, the third cell string 113 and the fourth cell string 114 are arranged alternately from left to right (i.e., the first direction X). The end cell sheets 120a of the third cell string 113 and the fourth cell string 114 near one end of the intermediate connector are provided with first electrodes 131 and second electrodes 132, which are arranged alternately from left to right.

[0065] It should be noted that the first direction X can also be set to be along the direction from right to left, and the second direction Y can be set to be along the direction from bottom to top. The arrangement structure of the battery string and the arrangement structure of the battery cells in each battery string can be adaptively adjusted with reference to the above content, and the embodiments of the present application will not be repeated here.

[0066] In a specific application, the first electrodes 131 on the end cells 120a in the first and third cell strings 111 and 113 are connected to a corresponding intermediate connector 13, and the second electrodes 132 on the end cells 120a in the second and fourth cell strings 112 and 114 are connected to another corresponding intermediate connector. This arrangement of the cells 120 allows for sufficient space between adjacent intermediate connectors for routing lead wires, thereby preventing contact between the lead wires and causing short circuits.

[0067] In some embodiments, each battery cell 120 has four corners, and the four corners of the battery cell 120 can be set as right angles, that is, the battery cell 120 is a rectangular battery cell 120 or a square battery cell 120. Alternatively, the battery cell 120 includes at least one chamfered portion, the chamfered portion is provided with a chamfered edge 1201, and the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are located at corresponding positions.

[0068] It is understandable that in the photovoltaic module processing technology, a hot pressing process is usually required to hot press the battery layer formed by the battery string group and other structural layers. Here, packaging film and glass cover are laid on the upper and lower sides of the battery layer. The packaging film is melted by hot pressing to form packaging protection for the battery layer.

[0069] During the hot pressing process, the adhesive film material melts under the heat and flows to fill the gaps between the cells 120. The flowing adhesive film material exerts a certain impact force on the chamfered corners of the cells 120. However, in traditional photovoltaic modules, due to the limitations of the cell 120 layout structure, the chamfer of one cell 120 in two adjacent cells is arranged to correspond to the right angle of the other cell 120. This results in a relatively messy arrangement of the chamfered corners of the cell 120, which is not aesthetically pleasing. In addition, when the adhesive film material flows between the two cells 120, the right angles and chamfers of the two adjacent cells 120 are subjected to different impact forces. This can cause uneven force on the right angles or chamfers of the two cells 120, resulting in the risk of localized cracks or ruptures in the cells 120.

[0070] To this end, in the embodiment of the present application, by setting the four corners of each battery cell 120 to be right angles, that is, the battery cell 120 is a rectangular battery cell 120 or a square battery cell 120; or, each battery cell 120 includes at least one chamfered portion, the chamfered portion is provided with a chamfered edge 1201, and the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are located at corresponding positions. In this way, the chamfered portions of two adjacent battery cells 120 along the first direction X are ensured to have the same or similar structures, which not only improves the aesthetics of the layout structure of the battery cells 120; at the same time, when the film material flows through the corners of two adjacent battery cells 120 during the hot pressing process, it can ensure that the corners of the two battery cells 120 are subjected to more balanced forces, thereby reducing the risk of localized cracks or ruptures in the corners of the battery cells 120 due to uneven forces.

[0071] In some embodiments, the battery cell can be configured as a sliced ​​battery. For example, a sliced ​​battery is a half-cell battery, which can also be understood as a half-cell battery or a two-cell battery; or a sliced ​​battery can be a three-cell battery, a four-cell battery, or an eight-cell battery.

[0072] In other embodiments, a plurality of electrodes are provided on the surface of the cell 120, including first electrodes 131 and second electrodes 132 of opposite conductivity types. Preferably, the number of first electrodes 131 and second electrodes 132 on the cell 120 is equal. The first electrodes 131 and second electrodes 132 may be metal busbars provided on the surface of the cell 120, or may be solder pads provided on the surface of the cell 120 and spaced apart along a straight line.

[0073] Furthermore, the cell 120 may be a back-contact cell having a light-receiving surface and a backlight surface. The first electrode 131 and the second electrode 132 are both disposed on the backlight surface of the cell 120 , and the first electrode 131 and the second electrode 132 are alternately arranged in sequence.

[0074] Of course, the number of the first electrodes 131 and the second electrodes 132 may also be set to be unequal. The number of the first electrodes 131 and the second electrodes 132 may be flexibly set according to actual conditions, and this embodiment of the present application does not limit this.

[0075] In some embodiments, the number of battery cells 120 in a battery string may be an odd number (as shown in FIG. 1 ) or an even number (as shown in FIG. 8 ).

[0076] In some embodiments, the number of first electrodes 131 and second electrodes 132 on the surface of the battery cell 120 can be any number, and can generally be set to 8 to 40. Specifically, the number of first electrodes 131 and second electrodes 132 can be 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, etc. Preferably, the number of first electrodes 131 and second electrodes 132 is 12 to 24.

[0077] In some embodiments, the width of the first electrode 131 and the second electrode 132 can be set to a range of 30 μm to 100 μm. Specifically, the width of the first electrode 131 and the second electrode 132 can be set to a value such as 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 50 μm, 55 μm, 56 μm, 60 μm, 70 μm, 80 μm, or 100 μm. Preferably, the width of the first electrode 131 and the second electrode 132 is in the range of 30 μm to 60 μm.

[0078] Furthermore, the pad can be understood as a positive electrode pad or a negative electrode pad. In the case where the first electrode 131 and the second electrode 132 are both configured as metal busbars, the surface of the cell 120 can also be provided with a plurality of fine grid lines, which are connected to the metal busbars and have a width smaller than that of the metal busbars.

[0079] The number of the fine grid lines can be any value, and can generally be set to 40 to 250, for example, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, etc. Preferably, the number of the fine grid lines is set to 80 to 180.

[0080] In some embodiments, the width of the thin gate line can be set to 20um to 60um. Specifically, the width of the thin gate line can be 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, etc. Preferably, the width of the thin gate line can be in the range of 20um to 50um.

[0081] In some embodiments, the shape of the battery cell 120 (when viewed from above) may be rectangular, square, etc. In order to improve space utilization, the battery cell 120 may be configured to be rectangular or approximately rectangular.

[0082] It is understandable that the battery cell 120 may be a cuboid or a near cuboid with a certain length, a certain width and a certain thickness, wherein the length of the battery cell 120 is greater than the width, and both the length and the width of the battery cell 120 are greater than the thickness.

[0083] The ratio of the width to the thickness of the battery cell 120 may range from 0.5×103 to 4×103, specifically 0.5×103, 1.0×103, 2.0×103, 3.0×103, and 4.0×103. Preferably, the ratio of the width to the thickness of the battery cell 120 may range from 1.0×103 to 3.0×103, specifically 1.0×103, 1.4×103, 1.8×103, 2.0×103, and 3.0×103.

[0084] For example, the thickness of the battery cell 120 may range from 100 μm to 300 μm, specifically 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, etc. Preferably, the thickness of the battery cell 120 may range from 100 μm to 240 μm, specifically 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 220 μm, 240 μm, etc.

[0085] In some embodiments, the cell 120 may be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-compound solar cell, etc. Specifically, the multi-compound solar cell may be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell, etc.

[0086] Optionally, as shown in FIG1 , when the chamfered portion of the battery cell 120 is provided with a chamfered edge 1201 , the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are arranged opposite to each other or away from each other in the second direction Y.

[0087] In the embodiment of the present application, the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are arranged relative to each other or away from each other in the second direction Y, which at least means that the chamfered edges 1201 of two adjacent battery cells 120 along the second direction Y are close to each other so as to be relative to each other or away from each other so as to be away from each other. In this way, it can be ensured that the chamfered portion structures of two adjacent battery cells 120 in the same battery string are the same or similar, thereby reducing the risk of local hidden cracks or ruptures of the chamfered portions of different battery cells 120 due to uneven force in the hot pressing forming process.

[0088] Optionally, as shown in FIG3 , a preset angle is formed between the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X.

[0089] It is understood that the two chamfered portions corresponding to two adjacent battery cells 120 along the first direction X are each provided with a chamfered edge 1201. A preset angle can be formed between the two chamfered edges 1201 or between the extension lines of the two chamfered edges 1201. Different values ​​of the preset angle correspond to different magnitudes of the impact force of the film material flow on the battery cells 120 at the chamfered portion. Therefore, in actual use, by setting a reasonable range of values ​​for the preset angle, the processing requirements of the battery cells 120 can be met while reducing the risk of localized cracks or ruptures in the chamfered portions of the battery cells 120 due to uneven force.

[0090] In some embodiments, the preset angle ranges from 30° to 150°. Specifically, it can be any angle, such as 30°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, or 150°, or a range between any two angles. Alternatively, the preset angle range is 60° to 120°. Alternatively, the preset angle range is 70° to 100°, which provides a better effect in preventing the flow impact of the adhesive film material.

[0091] For example, as shown in Figure 3, the first angle formed by the chamfered edges of the two upper first battery cells 121 is θ1, and the second angle formed by the chamfered edges of the two lower second battery cells 122 is θ2. The first angle θ1 and the second angle θ2 can be set to be equal or unequal, and can be flexibly set according to actual conditions. The embodiments of the present application do not limit this.

[0092] Optionally, when all corners of the battery cells 120 are right angles, along the first direction X, corresponding right-angled sides of two adjacent battery cells 120 are parallel to each other.

[0093] In the embodiment of the present application, by setting the corresponding right-angled sides of two adjacent battery cells 120 to be parallel to each other, the arrangement of the battery cells 120 is made more regular, which not only improves the aesthetics of the layout structure of the battery cells 120, but also improves the force balance of the two battery cells 120 in the hot pressing forming process, thereby reducing the risk of local hidden cracks or ruptures in the corners of the battery cells 120 due to uneven force.

[0094] Optionally, as shown in FIG1 , the electrode arrangement structures on two adjacent battery cells 120 along the first direction X are the same, and the electrode arrangement structures on two adjacent battery cells 120 in each battery string along the second direction Y are opposite.

[0095] It should be noted that the electrode arrangement structure refers to the alternating arrangement structure of the first electrodes 131 and the second electrodes 132 on the surface of the battery cell 120. For example, the same electrode arrangement structure means that the electrodes on the two battery cells 120 along the first direction X are both arranged in a "first electrode 131 - second electrode 132 - first electrode 131 - second electrode 132..." structure; or, they are both arranged in a "second electrode 132 - first electrode 131 - second electrode 132 - first electrode 131..." structure.

[0096] Correspondingly, the opposite electrode arrangement structure means that along the first direction X, the electrodes on one of the battery cells 120 are arranged according to the structure of "first electrode 131-second electrode 132-first electrode 131-second electrode 132...", while the electrodes on the other battery cell 120 are arranged according to the structure of "second electrode 132-first electrode 131-second electrode 132-first electrode 131..."

[0097] In the example of the present application, by setting the electrode arrangement structure on two adjacent battery cells 120 along the first direction X to be the same, and the electrode arrangement structure on two adjacent battery cells 120 in the battery string along the second direction Y to be opposite, it is convenient to connect multiple battery cells 120 in series to form a battery string, and to form multiple battery strings into a battery string group, thereby improving the regularity of the layout structure of the entire battery cell 120.

[0098] In each battery string, the electrode positions in two adjacent battery cells 120 correspond to each other, and the first electrode 131 on one battery cell 120 is opposite to the second electrode 132 on the other battery cell 120, and the second electrode 132 on one battery cell 120 is opposite to the first electrode 131 on the other battery cell 120.

[0099] Optionally, as shown in FIG1 , two adjacent battery cells 120 in the battery string along the second direction Y are rotationally symmetrical. Rotational symmetry means that rotating one of the battery cells 120 by 180° can yield another battery cell 120. Rotational symmetry here includes both the rotational symmetry of the outer contours of the battery cells 120 and the rotational symmetry of the electrode arrangement structure on the battery cells 120. That is, the electrode arrangement structure on the battery cell 120 is rotationally symmetrical by 180°, so that rotating the battery cell 120 by 180° within the plane where the battery cell is located yields another battery cell 120 with the same structure. This allows the battery cells to be interconnected with their chamfers positioned relative to each other, and rotating the battery string by 180° yields another battery string. Optionally, as shown in FIG1 , the battery string is further provided with an electrical connector 14 , which is connected to the first electrode 131 of one of the battery cells 120 and the second electrode 132 of another adjacent battery cell 120; or, the electrical connector 14 is connected to the second electrode 132 of one of the battery cells 120 and the first electrode 131 of another adjacent battery cell 120. The electrical connector 14 may be a welding strip.

[0100] Specifically, in a battery string, the first electrode 131 of one of two adjacent battery cells 120 is electrically connected to the second electrode 132 of the other battery cell 120 through an electrical connector 14, or the second electrode 132 of one of two adjacent battery cells 120 is electrically connected to the first electrode 131 of the other battery cell 120, thereby forming a battery string by connecting multiple battery cells 120 in series.

[0101] In some embodiments, an end cell 120a is provided at one end of the cell string near the intermediate connector 13. The first electrode 131 or the second electrode 132 on the end cell 120a can be connected to the intermediate connector 13 via an electrical connector 14. Furthermore, an end connector is provided at the end of each cell string away from the intermediate connector 13. The electrical connector 14 can electrically connect the first electrode 131 or the second electrode 132 on the cell 120 at the end of the cell string away from the intermediate connector 13 to the end connector. Multiple end connectors can be provided, for example, three end connectors each on the upper and lower sides, with the multiple end connectors spaced apart along the first direction X. Multiple cell strings can then be connected via the intermediate connector 13 and the end connectors to form a photovoltaic module.

[0102] Optionally, as shown in FIG. 1 , when the chamfered portion of the battery cell 120 is provided with a chamfered edge 1201 , the electrical connector 14 is staggered from the chamfered edge 1201 .

[0103] By arranging the electrical connector 14 to be staggered with the chamfered edge 1201 on the cell 120, the electrical connector 14 can be prevented from affecting the flow of the adhesive film material at the chamfered edge 1201 of the cell 120 during the hot pressing process of the photovoltaic module, so that the adhesive film material can fully fill the gap around the chamfered portion of the cell 120. It can also avoid the risk of the chamfered edge being broken when the electrical connector in the prior art crosses the chamfered edge, thereby improving the quality of the photovoltaic module.

[0104] Optionally, as shown in FIG3 , the distance D between the electrical connector 14 connected to the first electrode or the second electrode at the upper edge of the battery cell 120 and the corresponding chamfered edge 1201 along the first direction X satisfies the following: 0 < D ≤ 12 mm. Specifically, the distance D can be set to any number such as 0.5 mm, 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, or a range between any two values.

[0105] In an embodiment of the present application, a spacing range is set between the electrical connector 14 connected to the first electrode or the second electrode at the edge position of the battery cell 120 and the corresponding chamfered edge 1201, so as to reduce the influence of the electrical connector 14 on the flow of the film material at the chamfered edge 1201 of the battery cell 120 during the hot pressing molding process of the photovoltaic module, and also avoid the risk of the chamfered edge being broken when the electrical connector in the prior art crosses the chamfered edge; at the same time, since the space on the surface of the battery cell 120 is limited, if the spacing between the electrical connector 14 connected to the first electrode or the second electrode at the edge position and the corresponding chamfered edge 1201 is too large, it will affect the layout structure of the electrode on the surface of the battery cell 120.

[0106] Compared to the photovoltaic module structure in the prior art, the photovoltaic module of the present application not only takes into account the connection position between the electrodes on the cell 120 and the intermediate connector 13, to ensure that there is sufficient space between two adjacent intermediate connectors 13 for setting the lead wires, but also takes into account the positional relationship between the electrical connector and the chamfered edge 1201 of the cell 120, to avoid the impact of the flow of the film material on the cell 120 during the hot pressing process. In other words, the technical solution of the present application takes into account both the layout of the photovoltaic module and the hot pressing process, and needs to consider the position layout and connection structure of the cell 120, the intermediate connector 13, and the electrical connector 14 at the same time. It is not simply to set a chamfer on the cell and align two adjacent chamfers.

[0107] It should be noted that the spacing between the electrical connector 14 connected to the first electrode or the second electrode at the upper edge of the battery cell 120 and the corresponding chamfered edge 1201 can be obtained by measuring the straight-line distance from the center line of the electrical connector 14 to the end of the chamfered edge 1201 close to the electrical connector 14 along the first direction X.

[0108] Specifically, the multiple battery cells 120 include multiple alternatingly arranged or multiple alternatingly arranged first battery cells 121 and second battery cells 122. The first battery cells 121 and the second battery cells 122 can be cut from the same large battery cell. The first battery cells 121 and the second battery cells 122 are both provided with first electrodes 131 and second electrodes 132, and the electrode arrangement structures on the first battery cells 121 and the second battery cells 122 are opposite.

[0109] In specific applications, the first cell 121 and the second cell 122 are arranged to form a cell string, and the conversion between the first cell 121 and the second cell 122 can be achieved by rotation, which facilitates the design and processing operations of the cell 120 layout and helps reduce the complexity of the photovoltaic module layout process.

[0110] For example, as shown in FIG3 , the first battery cell 121 and the second battery cell 122 are adjacently arranged along the second direction, and the second electrode 132 arranged at the rightmost edge position of the first battery cell 121 is electrically connected to the first electrode 131 arranged at the rightmost edge position of the second battery cell 122 via an electrical connector 14 .

[0111] Among them, along the first direction X, the straight-line distance between the electrical connector 14 connected to the second electrode 132 provided at the rightmost edge of the first battery cell 121 and the chamfered edge 1201 at the upper right corner of the first battery cell 121 close to the electrical connector 14 is the spacing D, and 0<D≤12mm.

[0112] Alternatively, along the first direction X, the straight-line distance from the electrical connector 14 connected to the first electrode 131 provided at the rightmost edge of the second battery cell 122 to the chamfered edge 1201 at the lower right corner of the second battery cell 122 close to the electrical connector 14 is the spacing D, and 0<D≤12 mm.

[0113] In some embodiments, the photovoltaic module further comprises: a front sheet, an encapsulant film layer, and a back sheet. The encapsulant film layer is disposed between the front sheet and the back sheet. The first and second battery strings may be disposed within the encapsulant film layer. The encapsulant film layer may be made of materials such as EVA or POE, and the encapsulant film layer may protect the first and second battery strings. The front sheet and back sheet may be made of glass or plastic.

[0114] Furthermore, the backsheet is provided with a plurality of lead holes, which correspond to the gaps between two adjacent intermediate connectors, allowing lead wires to pass through the lead holes and electrically connect to the junction box outside the photovoltaic module. The cell layout structure provided in the embodiments of the present application reduces restrictions on the placement of the lead holes and the size of the structure, due to the relatively large gaps between two adjacent intermediate connectors, thereby increasing the flexibility of the photovoltaic module structure design.

[0115] In some embodiments, the photovoltaic module of the present application has a certain length, width and thickness. Depending on the specific application scenario, the required size specifications of the photovoltaic module are also different, and the corresponding length, width and thickness dimensions are also different.

[0116] For example, the length dimensions of the photovoltaic modules can be set to: 1741mm, 1742mm, 1743mm, 1744mm, 1745mm, 1746mm, 1747mm, 1748mm, 1749mm, 1750mm, 1751mm, 1752mm, 1753mm, 1754mm, 1755mm, 1756mm, 1757mm, 1758mm, 1759mm m, 1760mm, 1761mm, 1762mm, 1763mm, 1764mm, 1765mm, 1766mm, 1767mm, 1768mm, 1769mm, 177 0mm, 1771mm, 1772mm, 1773mm, 1774mm, 1775mm, 1776mm, 1777mm, 1778mm, 1779mm, 1780mm, etc.

[0117] Alternatively, the length dimensions of the photovoltaic modules may be set to: 1781mm, 1782mm, 1783mm, 1784mm, 1785mm, 1786mm, 1787mm, 1788mm, 1789mm, 1790mm, 1791mm, 1792mm, 1793mm, 1794mm, 1795mm, 1796mm, 1797mm, 1798mm, 1799mm , 1800mm, 1801mm, 1802mm, 1803mm, 1804mm, 1805mm, 1806mm, 1807mm, 1808mm, 1809mm, 1810mm, 1811mm, 1812mm, 1813mm, 1814mm, 1815mm, 1816mm, 1817mm, 1818mm, 1819mm, 1820mm, etc.

[0118] Alternatively, the length dimensions of the photovoltaic modules may be set to: 1971mm, 1972mm, 1973mm, 1974mm, 1975mm, 1976mm, 1977mm, 1978mm, 1979mm, 1980mm, 1981mm, 1982mm, 1983mm, 1984mm, 1985mm, 1986mm, 1987mm, 1988mm, 1989mm, 1990mm, 1991mm, 1992mm, 1993mm, 1994mm , 1995mm, 1996mm, 1997mm, 1998mm, 1999mm, 2000mm, 2001mm, 2002mm, 2003mm, 2004mm, 2005mm, 2006mm, 2007mm, 2008mm, 2009mm, 2010mm, 2011mm, 2012mm, 2013mm, 2014mm, 2015mm, 2016mm, 2017mm, 2018mm, 2019mm, 2020mm, etc.

[0119] Alternatively, the length dimensions of the photovoltaic modules may be set to: 2161mm, 2162mm, 2163mm, 2164mm, 2165mm, 2166mm, 2167mm, 2168mm, 2169mm, 2170mm, 2171mm, 2172mm, 2173mm, 2174mm, 2175mm, 2176mm, 2177mm, 2178mm, 2179mm, 2180mm, 2181mm, 2182mm, 2183mm, 2184mm , 2185mm, 2186mm, 2187mm, 2188mm, 2189mm, 2190mm, 2191mm, 2192mm, 2193mm, 2194mm, 2195mm, 2196mm, 2197mm, 2198mm, 2199mm, 2200mm, 2201mm, 2202mm, 2203mm, 2204mm, 2205mm, 2206mm, 2207mm, 2208mm, 2209mm, 2210mm, etc.

[0120] Alternatively, the length dimensions of the photovoltaic modules may be set to: 2361mm, 2362mm, 2363mm, 2364mm, 2365mm, 2366mm, 2367mm, 2368mm, 2369mm, 2370mm, 2371mm, 2372mm, 2373mm, 2374mm, 2375mm, 2376mm, 2377mm, 2378mm, 2379mm , 2380mm, 2381mm, 2382mm, 2383mm, 2384mm, 2385mm, 2386mm, 2387mm, 2388mm, 2389mm, 2390mm, 2391mm, 2392mm, 2393mm, 2394mm, 2395mm, 2396mm, 2397mm, 2398mm, 2399mm, 2400mm, etc.

[0121] Exemplarily, the width dimensions of the photovoltaic modules may be: 1120mm, 1121mm, 1122mm, 1123mm, 1124mm, 1125mm, 1126mm, 1127mm, 1128mm, 1129mm, 1130mm, 1131mm, 1132mm, 1133mm, 1134mm, 1135mm, 1136mm, 1137mm, 1138mm, 1139mm, 1140mm, 1145mm, 1150mm, etc.

[0122] Alternatively, the width dimension of the photovoltaic module can be: 1290mm, 1291mm, 1292mm, 1293mm, 1294mm, 1295mm, 1296mm, 1297mm, 1298mm, 1299mm, 1300mm, 1301mm, 1302mm, 1303mm, 1304mm, 1305mm, 1306mm, 1307mm, 1308mm, 1309mm, 1310mm, 1311mm, 1312mm, 1313mm, 1314mm, 1315mm, 1316mm, 1317mm, 1318mm, 1319mm, 1320mm, 1325mm, 1330mm, etc.

[0123] It is understood that the layout of the cells 120 in a photovoltaic module can be flexibly configured according to the size of the photovoltaic module. By increasing or decreasing the number of cell strings, the length of the photovoltaic module can be adapted to the requirements, and by increasing or decreasing the number of cells 120 in each cell string, the width of the photovoltaic module can be adapted to the requirements. Regardless of the size of the photovoltaic module, the layout of the cells 120 in the aforementioned embodiment can be used as a reference for flexible design.

[0124] It is understandable that the multiple intermediate connectors may be completely different, or at least two of the intermediate connectors may be the same. As shown in Figures 1 and 8, the multiple intermediate connectors may include four intermediate connectors arranged in sequence along the first direction X, namely, intermediate connector one, intermediate connector two, intermediate connector three and intermediate connector four, intermediate connector two and intermediate connector three are all connected to the first battery string, the second battery string, the third battery string and the fourth battery string, and intermediate connector one, intermediate connector two, intermediate connector three and intermediate connector four can all correspond to the connection and position relationship in any of the above embodiments. At the same time, it should be noted that the photovoltaic module usually also includes end connectors on both sides, the end connector on one side is connected to the first battery string group 11, and the end connector on the other side is connected to the second battery string group 12. In this way, the end connectors on both sides and the multiple intermediate connectors can be used to form a photovoltaic module.

[0125] Optionally, as shown in FIG13 , an embodiment of the present application further provides a method for preparing a photovoltaic module, which is used to prepare any of the above-mentioned photovoltaic modules. The specific steps of the preparation method include:

[0126] Step 101, providing a battery cell, wherein the corners of the battery cell 120 are all right angles; or, the chamfered portion of the battery cell 120 is provided with a chamfered edge 1201;

[0127] Specifically, the cell 120 can be configured as a sliced ​​cell, which can be obtained by cutting a large cell into equal parts to obtain the sliced ​​cells required for typesetting. For example, a sliced ​​cell is a half-cell cell, which can also be understood as a half-cell cell or a two-cell cell; alternatively, the sliced ​​cell can be a three-cell cell, a four-cell cell, or an eight-cell cell, etc.

[0128] Furthermore, the surface of the cell may be provided with a first electrode 131 and a second electrode 132 of opposite conductivity types. For example, the cell in this application is a back contact cell, and the first electrodes 131 and the second electrodes 132 are alternately arranged on the backlight surface of the cell.

[0129] Step 102: Prepare a first battery string group 11 and a second battery string group 12; each of the first battery string group 11 and the second battery string group 12 includes a plurality of battery strings arranged at intervals along a first direction X; the battery strings include a plurality of battery cells 120 arranged and connected at intervals along a second direction Y; an end battery cell 120a at at least one end of the battery string is provided with a first electrode 131 and a second electrode 132 alternately arranged in sequence along the first direction X; if a chamfered portion of the battery cell 120 is provided with a chamfered edge 1201, the chamfered edges 1201 of two adjacent battery cells 120 along the first direction X are arranged to correspond to each other;

[0130] Specifically, a plurality of battery cells 120 are sequentially arranged at intervals along the second direction Y, and the plurality of battery cells 120 are connected using electrical connectors 14 to form a battery string. Furthermore, the plurality of battery strings are sequentially arranged along the first direction X to form a first battery string group 11 and a second battery string group 12. At the same time, it is ensured that the end battery cells 120a at at least one end of each battery string are provided with first electrodes 131 and second electrodes 132 alternately arranged along the first direction X, and that when arranging the battery cells, the chamfered edges 1201 of two adjacent battery cells along the first direction X correspond to each other.

[0131] Step 103: Connect the first battery string group 11 and the second battery string group 12 via an intermediate connector 13. The first battery string group 11 includes a first battery string 111 and a second battery string 112 arranged alternately along the first direction X, and the second battery string group 12 includes a third battery string 113 and a fourth battery string 114 arranged alternately along the first direction X. The first electrodes 131 on the end battery cells 120a in the first battery string 111 and the third battery string 113 are connected to the same intermediate connector 13; the second electrodes 132 on the end battery cells 120a in the second battery string 112 and the fourth battery string 114 are connected to another intermediate connector.

[0132] It can be understood that connecting the first battery string group 11 and the second battery string group 12 through the intermediate connector 13 can mean: connecting the first battery string group 11 and the second battery string group 12 at least through the intermediate connector 13, which can also include using multiple intermediate connectors, end connectors on both sides, etc. to connect the first battery string group 11 and the second battery string group 12 for subsequent formation of a photovoltaic module.

[0133] Specifically, at least the intermediate connector 13 is used to connect the end cell sheets 120a of each cell string in the first cell string group 11 and the second cell string group 12, respectively, so as to connect the first cell string group 11 and the second cell string group 12 to form a photovoltaic module, and the first electrodes 131 on the end cell sheets 120a in the first cell string 111 and the third cell string 113 are connected to the same intermediate connector 13, and the second electrodes 132 on the end cell sheets 120a in the second cell string 112 and the fourth cell string 114 are connected to another intermediate connector.

[0134] In an embodiment of the present application, in a photovoltaic module prepared by the photovoltaic module preparation method of the present application, the first electrode 131 on the end cell 120a in the first cell string 111 and the third cell string 113 is connected to the same intermediate connector, and the second electrode 132 on the end cell 120a in the second cell string 112 and the fourth cell string 114 is connected to another adjacent intermediate connector. As a result, there can be sufficient space between two adjacent intermediate connectors for setting lead wires, so as to ensure that there is a large spacing between the lead wires, thereby avoiding the lead wires contacting each other and causing short circuit problems.

[0135] Furthermore, by setting the corners of the cell 120 to all be right angles, or by setting chamfered edges 1201 on the chamfered portions of the cell 120, and arranging the chamfered edges 1201 of two adjacent cell 120 along the first direction X to correspond to each other, the regularity of the cell arrangement structure can be improved, which not only enhances the aesthetics, but also, during the hot pressing process of the photovoltaic module, the flow of the adhesive film material can make the impact force on the corners of two adjacent cell 120 more balanced, thereby reducing the risk of localized cracks or ruptures in the corners of the cell 120 due to uneven force.

[0136] In addition, by adopting the battery cell 120 layout structure provided in the embodiment of the present application, a certain space can be reserved at the ends of two adjacent intermediate connectors 13 close to each other for connecting the jumper bus bars to meet the cross-distance connection requirements between battery strings, thereby improving the flexibility of photovoltaic module circuit design.

[0137] The battery cell 120 in the present application can be a half-cut battery cell, and the multiple battery cells 120 include a first battery cell 121 and a second battery cell 122. The first battery cell 121 is provided with a first electrode 131 and a second electrode 132 arranged alternately along the first direction X, and the second battery cell 122 is provided with a second electrode 132 and a first electrode 131 arranged alternately along the first direction X. The first battery cell 121 and the second battery cell 122 are cut from the same large battery cell, and then the first battery cell 121 and the second battery cell 122 can be connected according to a certain layout structure to form a battery string. Of course, in the process of arranging the first battery cell 121 and the second battery cell 122, the first battery cell 121 and the second battery cell 122 can be directly connected using the electrical connector 14.

[0138] It should be noted that the first cell 121 and the second cell 122 can both serve as the end cell 120a. Among the first cell 121 and the second cell 122, one of the cells can be obtained by rotating the other cell 180 degrees, thereby facilitating the design and processing operations of the cell layout and helping to reduce the complexity of the photovoltaic module layout process.

[0139] It should be noted that when the first battery cell 121 and the second battery cell 122 are used to prepare the first battery string 111, the second battery string 112, the third battery string 113, and the fourth battery string 114, respectively, the preparation order of each battery string can be flexibly set according to actual conditions, and this embodiment of the present application does not limit this. The number of battery cells in each battery string can be an odd number or an even number.

[0140] Optionally, preparing the first battery string group 11 and the second battery string group 12 includes:

[0141] Step S11, arranging and connecting the plurality of battery cells to form a first battery string 111 and a second battery string 112 respectively, and arranging the plurality of the first battery strings 111 and the second battery strings 112 along the first direction X to form a first battery string group 11;

[0142] In step S12 , the plurality of battery cells are arranged and connected to form a third battery string 113 and a fourth battery string 114 , respectively; and the plurality of third battery strings 113 and the fourth battery string 114 are arranged along the first direction X to form the second battery string group 12 .

[0143] In some embodiments, as shown in FIG8 , specific preparation methods for the first battery string 111 , the second battery string 112 , the third battery string 113 , and the fourth battery string 114 are described below based on the case where the number of battery cells in the battery string is an even number.

[0144] As shown in FIG9 , the specific steps of preparing the first battery string 111 in step S11 are as follows:

[0145] S1101, placing the second battery cell 122 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the first battery cell 121 is placed at the very end of the battery string;

[0146] S1102, placing a plurality of electrical connectors 14 on the second electrodes 132 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding second electrode 132 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0147] S1103, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of another second battery cell 122;

[0148] S1104. Repeat step S1103 until multiple electrical connectors 14 are placed and connected to the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite terminal first battery cell 121. Multiple electrical connectors 14 are placed on the first electrode 131 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the first battery string 111 is completed.

[0149] In other embodiments, during the preparation of the first battery string 111, the first battery cells 121 and the second battery cells 122 may be arranged in order, and then all the electrical connectors 14 may be laid out sequentially or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 to form the first battery string 111. The specific steps are as follows:

[0150] S1101a, placing the second battery cell 122 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the first battery cell 121 is placed at the very end of the battery string;

[0151] S1102a, laying electrical connectors 14 on the first battery cell 121 and the second battery cell 122, wherein a plurality of electrical connectors 14 are placed on the second electrode 132 of the first-end second battery cell 122, and the electrical connectors 14 are extended upward beyond the outer edge of the first-end second battery cell 122; a plurality of electrical connectors 14 are placed on the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite first battery cell 121, and a plurality of electrical connectors 14 are placed on the first electrode 131 of the first battery cell 121 and the second electrode 132 of another second battery cell 122; and this process is repeated until a plurality of electrical connectors 14 are placed on the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite end first battery cell 121, and a plurality of electrical connectors 14 are placed on the first electrode 131 of the end first battery cell 121, and the electrical connectors 14 are extended downward beyond the outer edge of the end first battery cell 121;

[0152] S1103a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the first battery string 111 .

[0153] As shown in FIG10 , the specific steps of preparing the second battery string 112 in step S11 are as follows:

[0154] S1105, placing the second battery cell 122 at the head end of the second battery string 112, followed by the first battery cell 121, and repeating this process until the first battery cell 121 is placed at the end of the battery string;

[0155] S1106, placing multiple electrical connectors 14 on the first electrodes 131 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding first electrode 131 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0156] S1107, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of another second battery cell 122;

[0157] S1108. Repeat step S1107 until multiple electrical connectors 14 are placed and connected to the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite terminal first battery cell 121. Multiple electrical connectors 14 are placed on the second electrode 132 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the second battery string 112 is completed.

[0158] It should be noted that, in the process of preparing the second battery string 112, the first battery cells 121 and the second battery cells 122 may be arranged in order first, and then all the electrical connectors 14 may be laid out successively or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 to form the second battery string 112. The specific steps are as follows:

[0159] S1104a, placing the second battery cell 122 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the first battery cell 121 is placed at the very end of the battery string;

[0160] S1105a, laying electrical connectors 14 on the first battery cell 121 and the second battery cell 122, wherein a plurality of electrical connectors 14 are placed on the first electrode 131 of the second battery cell 122 at the head end, and the electrical connectors 14 are extended upward beyond the outer edge of the second battery cell 122 at the head end; a plurality of electrical connectors 14 are placed on the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite first battery cell 121, and a plurality of electrical connectors 14 are placed on the second electrode 132 of the first battery cell 121 and the first electrode 131 of another second battery cell 122; and this process is repeated until a plurality of electrical connectors 14 are placed on the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite end first battery cell 121, and a plurality of electrical connectors 14 are placed on the second electrode 132 of the end first battery cell 121, and the electrical connectors 14 are extended downward beyond the outer edge of the end first battery cell 121;

[0161] S1106a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the second battery string 112 .

[0162] In some embodiments, the second battery string 112 may be obtained by rotating the first battery string 111 by 180°; or, the first battery string 111 may be obtained by rotating the second battery string 112 by 180°.

[0163] As shown in FIG11 , the specific steps of preparing the third battery string 113 in step S12 are as follows:

[0164] S1201, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the second battery cell 122 is placed at the end of the battery string;

[0165] S1202, placing a plurality of electrical connectors 14 on the first electrodes 131 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding first electrode 131 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0166] S1203, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121;

[0167] S1204. Repeat step S1203 until multiple electrical connectors 14 are placed and connected to the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite terminal second battery cell 122. Multiple electrical connectors 14 are placed on the second electrode 132 of the terminal second battery cell 122, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal second battery cell 122. In this way, the preparation of the third battery string 113 is completed.

[0168] It should be noted that, in the process of preparing the third battery string 113, the first battery cells 121 and the second battery cells 122 may be arranged in order first, and then all the electrical connectors 14 may be laid out successively or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the third battery string 113. The specific preparation is as follows:

[0169] S1201a, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the second battery cell 122 is placed at the end of the battery string;

[0170] S1202a, placing multiple electrical connectors 14 on the first electrode 131 of the first battery cell 121 at the head end, with the other end extending outwardly from the outer edge of the first battery cell 121 at the head end; placing multiple electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing multiple electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121; repeating this process until multiple electrical connectors 14 are placed on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122 at the end, and multiple electrical connectors 14 are placed on the second electrode 132 of the second battery cell 122 at the end, with the other end extending outwardly from the outer edge of the second battery cell 122 at the end;

[0171] S1203a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the third battery string 113 .

[0172] As shown in FIG12 , the specific steps of preparing the fourth battery string 114 in step S12 are as follows:

[0173] S1205, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the second battery cell 122 is placed at the very end of the battery string;

[0174] S1206, placing multiple electrical connectors 14 on the second electrodes 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding second electrode 132 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0175] S1207, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121;

[0176] S1208. Repeat step S1207 until multiple electrical connectors 14 are placed and connected to the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite terminal second battery cell 122. Multiple electrical connectors 14 are placed on the first electrode 131 of the terminal second battery cell 122, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal second battery cell 122. In this way, the preparation of the fourth battery string 114 is completed.

[0177] It should be noted that, in the process of preparing the fourth battery string 114, the first battery cells 121 and the second battery cells 122 may be arranged in order first, and then all the electrical connectors 14 may be laid out successively or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the fourth battery string 114. The specific steps are as follows:

[0178] S1204a, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the second battery cell 122 is placed at the end of the battery string;

[0179] S1205a, placing multiple electrical connectors 14 on the second electrode 132 of the first battery cell 121 at the head end, with the other end extending outwardly from the outer edge of the first battery cell 121 at the head end; placing multiple electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing multiple electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121; repeating this process until multiple electrical connectors 14 are placed on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122 at the end, and multiple electrical connectors 14 are placed on the first electrode 131 of the second battery cell 122 at the end, with the other end extending outwardly from the outer edge of the second battery cell 122 at the end;

[0180] S1206a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the fourth battery string 114 .

[0181] In some embodiments, the fourth battery string 114 may also be obtained by rotating the third battery string 113 by 180°; or, the third battery string 113 may also be obtained by rotating the fourth battery string 114 by 180°.

[0182] In other embodiments, as shown in FIG1 , specific preparation methods of the first battery string 111 , the second battery string 112 , the third battery string 113 and the fourth battery string 114 will be described below when the number of battery cells 120 in the battery string is an odd number.

[0183] As shown in FIG4 , the specific steps for preparing the first battery string 111 are as follows:

[0184] S2101, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the very end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0185] S2102, placing a plurality of electrical connectors 14 on the second electrodes 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding second electrode 132 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0186] S2103, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121;

[0187] S2104. Repeat step S2103 until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the first battery string 111 is completed.

[0188] It should be noted that, during the preparation of the first battery string 111, the first battery cells 121 and the second battery cells 122 may be arranged in order first, and then all the electrical connectors 14 may be laid out sequentially or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the first battery string 111. The specific steps are as follows:

[0189] S2101a, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the very end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0190] S2102a, placing multiple electrical connectors 14 on the second electrode 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 corresponds to the second electrode 132 and the other end extends outwardly beyond the outer edge of the first battery cell 121 at the head end; placing multiple electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing multiple electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121; repeating this process until multiple electrical connectors 14 are placed on the first electrode 131 of the first battery cell 121 at the end end, so that one end of the electrical connector 14 corresponds to the first electrode 131 and the other end extends outwardly beyond the outer edge of the first battery cell 121 at the end end;

[0191] S2103a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the first battery string 111 .

[0192] As shown in FIG5a , the specific steps for preparing the second battery string 112 are as follows:

[0193] S2105: Place the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeat this process until the first battery cell 121 is placed at the very end of the battery string; wherein the first battery cell 121 placed at the end may be the first battery cell 121 temporarily converted and stored in step S2101;

[0194] S2106, placing multiple electrical connectors 14 on the first electrodes 131 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding first electrode 131 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0195] S2107, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121;

[0196] S2108. Repeat step S2107 until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the second battery string 112 is completed.

[0197] It should be noted that, during the preparation of the second battery string 112, the first battery cells 121 and the second battery cells 122 may be arranged in sequence first, and then all the electrical connectors 14 may be laid out sequentially or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the second battery string 112. The specific operation steps can be referred to the above-mentioned steps for preparing the first battery string 111, and only adaptive adjustments may be made. This embodiment of the present application will not be further described here.

[0198] In some embodiments, the remaining second battery cell 122 in step S2101 can be directly stored without being rotated 180°, and then the second battery cell 122 can be directly used to prepare the second battery string 112, as shown in FIG5b. The specific steps are as follows:

[0199] S2109, placing the second battery cell 122 temporarily stored in step S2101 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the second battery cell 122 is placed at the very end of the battery string;

[0200] S2110, placing a plurality of electrical connectors 14 on the second electrodes 132 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding second electrode 132 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0201] S2111, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of another second battery cell 122;

[0202] S2112, repeat step S2111 until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal second battery cell 122, with one end of the electrical connector 14 connected to the corresponding first electrode 131 and the other end extending outward from the outer edge of the terminal second battery cell 122, thereby obtaining a prefabricated second battery string;

[0203] S2113 , rotating the prefabricated second battery string as a whole by 180° to obtain the second battery string 112 .

[0204] It should be noted that in the process of preparing the prefabricated second battery string, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form a prefabricated second battery string. The specific operating steps can be referred to the above-mentioned steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of this application will not be repeated here.

[0205] As shown in FIG6 , the specific steps for preparing the third battery string 113 are as follows:

[0206] S2201, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0207] S2202, placing a plurality of electrical connectors 14 on the first electrodes 131 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding first electrode 131 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0208] S2203, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121;

[0209] S2204: Repeat step S2203 until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the third battery string 113 is completed.

[0210] It should be noted that, in the process of preparing the third battery string 113, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form the third battery string 113. The specific operation steps can be referred to the above steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of the present application will not be repeated here.

[0211] As shown in FIG7 a , the specific steps for preparing the fourth battery string 114 are as follows:

[0212] S2205: Place the first battery cell 121 at the beginning of the battery string, followed by the second battery cell 122, and repeat this process until the first battery cell 121 is placed at the end of the battery string; the first battery cell 121 placed at the end may be the first battery cell 121 temporarily stored in step S2201;

[0213] S2206, placing multiple electrical connectors 14 on the second electrodes 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding second electrode 132 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0214] S2207, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121;

[0215] S2208. Repeat step S2207 until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the fourth battery string 114 is completed.

[0216] It should be noted that, in the process of preparing the fourth battery string 114, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form the fourth battery string 114. The specific operation steps can be referred to the above steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of the present application will not be repeated here.

[0217] In some embodiments, the remaining second cell 122 in step S2201 can be directly stored without being rotated 180°, and then the second cell 122 can be directly used to prepare the fourth cell string 114, as shown in FIG7b. The specific steps are as follows:

[0218] S2209, placing the second battery cell 122 temporarily stored in step S2201 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the second battery cell 122 is placed at the very end of the battery string;

[0219] S2210, placing a plurality of electrical connectors 14 on the first electrodes 131 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding first electrode 131 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0220] S2211, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of another second battery cell 122;

[0221] S2212, repeat step S2211 until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal second battery cell 122, with one end of the electrical connector 14 connected to the corresponding second electrode 132 and the other end extending outward from the outer edge of the terminal second battery cell 122, thereby obtaining a prefabricated fourth battery string;

[0222] S2213: Then, the prefabricated fourth battery string is rotated as a whole by 180° to obtain the fourth battery string 114.

[0223] It should be noted that in the process of preparing the prefabricated fourth battery string, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form a prefabricated fourth battery string. The specific operating steps can be referred to the above-mentioned steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of this application will not be repeated here.

[0224] Optionally, preparing the first battery string group 11 and the second battery string group 12 includes:

[0225] S21, the preparing of the first battery string group 11 and the second battery string group 12 includes: arranging and connecting a plurality of the battery cells to form a first battery string 111 and a third battery string 113, respectively, and arranging the first battery string 111 and the third battery string 113 along the second direction Y;

[0226] S22, arranging and connecting the plurality of battery cells to form a second battery string 112 and a fourth battery string 114, respectively; arranging the second battery string 112 and the fourth battery string 114 along the second direction Y; and arranging them alternately along the first direction multiple times, and then arranging them along the first direction to simultaneously form the first battery string group 11 and the second battery string group 12.

[0227] It should be noted that, as shown in Figures 1 and 8, the above-mentioned multiple alternating arrangements along the first direction at least mean: arranging the completed first battery string 111 and the third battery string 113 along the second direction Y, arranging the completed second battery string 112 and the fourth battery string 114 along the second direction Y, and making the arrangement of the first battery string 111 and the third battery string 113 as a whole in the second direction Y and the arrangement of the second battery string 112 and the fourth battery string 114 as a whole in the second direction Y alternately arranged along the first direction X. In this way, after the alternating arrangement along the first direction X, the first battery string group 11 and the second battery string group 12 can be formed simultaneously subsequently.

[0228] As shown in FIG4 , the specific steps of preparing the first battery string 111 in step S21 are as follows:

[0229] S3101, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0230] S3102, placing multiple electrical connectors 14 on the second electrodes 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding second electrode 132 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0231] S3103, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121;

[0232] S3104. Repeat step S3103 until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the first battery string 111 is completed.

[0233] It should be noted that, during the preparation of the first battery string 111, the first battery cells 121 and the second battery cells 122 may be arranged in order first, and then all the electrical connectors 14 may be laid out sequentially or simultaneously, and all the electrical connectors 14 may be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the first battery string 111. The specific steps are as follows:

[0234] S3101a, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the very end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0235] S3102a, placing multiple electrical connectors 14 on the second electrode 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 corresponds to the second electrode 132 and the other end extends outwardly beyond the outer edge of the first battery cell 121 at the head end; placing multiple electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing multiple electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121; repeating this process until multiple electrical connectors 14 are placed on the first electrode 131 of the first battery cell 121 at the end end, so that one end of the electrical connector 14 corresponds to the first electrode 131 and the other end extends outwardly beyond the outer edge of the first battery cell 121 at the end end;

[0236] S3203a , completing the connection between all electrical connectors 14 and the corresponding first electrodes 131 and second electrodes 132 , thereby preparing the first battery string 111 .

[0237] The specific steps of preparing the third battery string 113 in step S21 are as follows:

[0238] S3105: Place the first battery cell 121 at the beginning of the battery string, followed by the second battery cell 122, and repeat this process until the first battery cell 121 is placed at the end of the battery string; the first battery cell 121 placed at the end may be the first battery cell 121 temporarily stored in step S3101;

[0239] S3106, placing multiple electrical connectors 14 on the first electrodes 131 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding first electrode 131 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0240] S3107, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121;

[0241] S3108. Repeat step S3107 until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the third battery string 113 is completed.

[0242] It should be noted that, in the process of preparing the third battery string 113, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form the third battery string 113. The specific operation steps can be referred to the above steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of the present application will not be repeated here.

[0243] In some embodiments, the remaining second battery cell 122 in step S3101 can be directly stored without being rotated 180°, and then the second battery cell 122 can be directly used to prepare the third battery string 113. The specific steps are as follows:

[0244] S3105a, placing the second battery cell 122 temporarily stored in step S3101 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the second battery cell 122 is placed at the very end of the battery string;

[0245] S3106a, placing a plurality of electrical connectors 14 on the second electrodes 132 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding second electrode 132 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0246] S3107a, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of another second battery cell 122;

[0247] S3108a, repeat step S3107a until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal second battery cell 122, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal second battery cell 122. In this way, a prefabricated third battery string can be obtained.

[0248] S3109a: Rotate the prefabricated third battery string 180° as a whole to obtain the third battery string 113.

[0249] It should be noted that in the process of preparing the prefabricated third battery string, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form a prefabricated third battery string. The specific operating steps can be referred to the above-mentioned steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of this application will not be repeated here.

[0250] The specific steps of preparing the second battery string 112 in step S22 are as follows:

[0251] S3201, placing the first battery cell 121 at the head end of the battery string, followed by the second battery cell 122, and repeating this process until the first battery cell 121 is placed at the end of the battery string; at the same time, rotating the remaining second battery cell 122 by 180° to convert it into a first battery cell 121 and temporarily storing it for use in preparing another battery string;

[0252] S3202, placing a plurality of electrical connectors 14 on the first electrodes 131 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding first electrode 131 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0253] S3203, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of another first battery cell 121;

[0254] S3204. Repeat step S3203 until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding second electrode 132, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the second battery string 112 is completed.

[0255] It should be noted that, in the process of preparing the second battery string 112, the first battery cells 121 and the second battery cells 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cells 121 and the second battery cells 122 in series to form the second battery string 112. For specific operating steps, please refer to the above-mentioned steps for preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of this application will not be repeated here.

[0256] The specific steps of preparing the fourth battery string 114 in step S22 are as follows:

[0257] S3205: Place the first battery cell 121 at the beginning of the battery string, followed by the second battery cell 122, and repeat this process until the first battery cell 121 is placed at the end of the battery string; the first battery cell 121 placed at the end may be the first battery cell 121 temporarily stored in step S3201;

[0258] S3206, placing multiple electrical connectors 14 on the second electrodes 132 of the first battery cell 121 at the head end, so that one end of the electrical connector 14 is connected to the corresponding second electrode 132 and the other end extends outward from the outer edge of the first battery cell 121 at the head end;

[0259] S3207, placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the first battery cell 121 and the second electrode 132 of the opposite second battery cell 122, and placing and connecting a plurality of electrical connectors 14 on the first electrode 131 of the second battery cell 122 and the second electrode 132 of another first battery cell 121;

[0260] S3208. Repeat step S3207 until multiple electrical connectors 14 are placed on the first electrodes 131 of the terminal first battery cell 121, and one end of the electrical connector 14 is connected to the corresponding first electrode 131, and the other end extends outward from the outer edge of the terminal first battery cell 121. In this way, the preparation of the fourth battery string 114 is completed.

[0261] It should be noted that, in the process of preparing the fourth battery string 114, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form the fourth battery string 114. The specific operation steps can be referred to the above steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of the present application will not be repeated here.

[0262] In some embodiments, the remaining second cell 122 in step S3201 can be directly stored without being rotated 180°, and then the second cell 122 can be directly used to prepare the fourth cell string 114. The specific steps are as follows:

[0263] S3205a, placing the second battery cell 122 temporarily stored in step S3201 at the head end of the battery string, followed by the first battery cell 121, and repeating this process until the second battery cell 122 is placed at the very end of the battery string;

[0264] S3206a, placing multiple electrical connectors 14 on the first electrodes 131 of the first-end second battery cell 122, with one end of the electrical connector 14 connected to the corresponding first electrode 131 and the other end extending outward from the outer edge of the first-end second battery cell 122;

[0265] S3207a, placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the second battery cell 122 and the first electrode 131 of the opposite first battery cell 121, and placing and connecting a plurality of electrical connectors 14 on the second electrode 132 of the first battery cell 121 and the first electrode 131 of another second battery cell 122;

[0266] S3208a, repeating step S3207a until multiple electrical connectors 14 are placed on the second electrodes 132 of the terminal second battery cell 122, with one end of the electrical connector 14 connected to the corresponding second electrode 132 and the other end extending outward from the outer edge of the terminal second battery cell 122, thereby obtaining a prefabricated fourth battery string;

[0267] S3209a: Then, the prefabricated fourth battery string is rotated as a whole by 180° to obtain the fourth battery string 114.

[0268] It should be noted that in the process of preparing the prefabricated fourth battery string, the first battery cell 121 and the second battery cell 122 can be arranged in order first, and then all the electrical connectors 14 can be laid out successively or simultaneously, and all the electrical connectors 14 can be connected to the corresponding first electrodes and second electrodes to connect the first battery cell 121 and the second battery cell 122 in series to form a prefabricated fourth battery string. The specific operating steps can be referred to the above-mentioned steps of preparing the first battery string 111, and adaptive adjustments can be made. The embodiments of this application will not be repeated here.

[0269] In the embodiment of the present application, after the first battery string 111 is prepared, the third battery string 113 can be prepared. A second battery cell 122 may remain during the preparation of the first battery string 111, and this second battery cell 122 can be used to prepare the third battery string 113, thereby completing the preparation of the first and third battery strings 111, 113.

[0270] In the embodiment of the present application, the first battery cell 121 and the second battery cell 122 can be used to prepare the second battery string 112, and then the fourth battery string 114 can be prepared. When preparing the second battery string 112, one second battery cell 122 will remain, and this second battery cell 122 can be used to prepare the fourth battery string 114, or the specific preparation of the second battery string 112 and the fourth battery string 114 can be completed.

[0271] It is understandable that the repetitions recorded in the above multiple places can be understood as: one repetition or multiple repetitions, which can be flexibly understood according to actual conditions, and the embodiments of the present application do not limit this.

[0272] The preparation method of the above embodiment of the present application is used to prepare the first battery string 111, the second battery string 112, the third battery string 113 and the fourth battery string 114 respectively, which can effectively simplify the process steps required to be performed by the processing equipment and shorten the moving distance of the equipment, thereby greatly improving production efficiency.

[0273] After the first cell string group 11 and the second cell string group 12 are connected at least through the intermediate connector 13, the method for preparing the photovoltaic module may further include: laminating the backplane, the lower packaging film, the first cell string group and the second cell string group, the upper packaging film, the front plate, etc. (i.e., the above-mentioned hot pressing process) to form a laminate, and installing a junction box on the laminate to form a photovoltaic module.

[0274] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0275] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that: include: A first battery string group, a second battery string group, and a plurality of intermediate connectors provided between the first battery string group and the second battery string group, wherein the plurality of intermediate connectors are arranged at intervals along a first direction; the first battery string group and the second battery string group each include a plurality of battery strings arranged at intervals in sequence along the first direction; The battery string includes a plurality of battery cells spaced apart and arranged along the second direction; the battery cell at the end of the battery string near one end of the intermediate connector is provided with first electrodes and second electrodes alternately arranged in sequence along the first direction; The first battery string group includes a first battery string and a second battery string alternately arranged along the first direction, and the second battery string group includes a third battery string and a fourth battery string alternately arranged along the first direction; the first electrodes on the end battery cells in the first battery string and the third battery string are connected to the same intermediate connector; the second electrodes on the end battery cells in the second battery string and the fourth battery string are connected to another adjacent intermediate connector; The corners of the battery cells are all right angles; or, The corners of the battery cells include chamfered portions, the chamfered portions are provided with chamfered edges, and the chamfered edges of two adjacent battery cells along the first direction are located at corresponding positions.

2. The photovoltaic module according to claim 1, characterized in that In the case where the chamfered portion of the battery cell is provided with a chamfered edge, the chamfered edges of two adjacent battery cells along the first direction are arranged opposite to each other or away from each other in the second direction.

3. The photovoltaic module according to claim 2, characterized in that A preset angle is formed between the chamfered edges of two adjacent battery cells along the first direction.

4. The photovoltaic module according to claim 3, characterized in that The range of the preset angle is: 30°-150°.

5. The photovoltaic module according to claim 1, characterized in that In the case where all corners of the battery cells are right angles, along the first direction, right-angled sides of corresponding right angles in two adjacent battery cells are parallel to each other.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The electrode arrangement structures of two adjacent battery cells along the first direction are the same, and the electrode arrangement structures of two adjacent battery cells in the battery string along the second direction are opposite.

7. The photovoltaic module according to any one of claims 1 to 6, characterized in that: The battery string is further provided with an electrical connector; the electrical connector is connected to the first electrode of one of the battery cells and the second electrode of another adjacent battery cell; or, the electrical connector is connected to the second electrode of one of the battery cells and the first electrode of another adjacent battery cell.

8. The photovoltaic module according to claim 7, characterized in that: In the case where the chamfered portion of the battery cell is provided with a chamfered edge, the electrical connector is staggered from the chamfered edge.

9. The photovoltaic module according to claim 8, characterized in that: The distance D between the electrical connector connected to the first electrode or the second electrode at the upper edge of the battery cell along the first direction and the corresponding chamfered edge satisfies: 0<D≤12mm.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first electrodes on the end battery cells in the first battery string and the third battery string are both connected to the same intermediate connector through an electrical connector; and / or, the second electrodes on the end battery cells in the second battery string and the fourth battery string are both connected to another adjacent intermediate connector through an electrical connector.

11. The photovoltaic module according to any one of claims 1 to 10, characterized in that: The conductivity type of the first electrode is opposite to that of the second electrode; and / or, two adjacent cells in the cell string are rotationally symmetrical along the second direction; and / or, the cell is a sliced ​​cell; and / or, the cell is a back-contact solar cell; and / or, the first electrode and the second electrode include at least one of a metal busbar and a pad; and / or, the number of the first electrode and the second electrode on the cell is equal.

12. A method for preparing a photovoltaic module, for preparing the photovoltaic module according to any one of claims 1 to 11, characterized in that: include: Providing a battery cell, wherein all corners of the battery cell are right angles; or, the battery cell includes a chamfered portion, and the chamfered portion is provided with a chamfered edge; A first battery string group and a second battery string group are prepared; each of the first battery string group and the second battery string group includes a plurality of battery strings spaced apart and arranged along a first direction; the battery strings include a plurality of battery cells spaced apart and connected along a second direction; the end battery cells at at least one end of the battery strings are provided with first electrodes and second electrodes alternately arranged along the first direction; if the chamfered portions of the battery cells are provided with chamfered edges, the chamfered edges of two adjacent battery cells along the first direction are arranged to correspond to each other; The first battery string group and the second battery string group are connected by an intermediate connector; the first battery string group includes a first battery string and a second battery string arranged alternately along the first direction, and the second battery string group includes a third battery string and a fourth battery string arranged alternately along the first direction; the first electrodes on the end battery cells in the first battery string and the third battery string are connected to the same intermediate connector; the second electrodes on the end battery cells in the second battery string and the fourth battery string are connected to another intermediate connector.

13. The method for preparing a photovoltaic module according to claim 12, wherein: The preparation of the first battery string group and the second battery string group includes: arranging and connecting a plurality of the battery cells to form a first battery string and a second battery string respectively, arranging a plurality of the first battery strings and the second battery strings along the first direction to form the first battery string group; arranging and connecting a plurality of the battery cells to form a third battery string and a fourth battery string respectively; arranging a plurality of the third battery strings and the fourth battery strings along the first direction to form the second battery string group; Alternatively, the preparation of the first battery string group and the second battery string group includes: arranging and connecting a plurality of the battery cells to form a first battery string and a third battery string, respectively, and arranging the first battery string and the third battery string along the second direction; arranging and connecting a plurality of the battery cells to form a second battery string and a fourth battery string, respectively, and arranging the second battery string and the fourth battery string along the second direction, and after arranging them alternately multiple times along the first direction, arranging them simultaneously along the first direction to form the first battery string group and the second battery string group.

14. The method for preparing a photovoltaic module according to claim 13, wherein: The plurality of battery cells include a first battery cell and a second battery cell, and the electrode arrangement structures on the first battery cell and the second battery cell are opposite; the first battery cell is provided with a first electrode and a second electrode arranged alternately along the first direction, and the second battery cell is provided with a second electrode and a first electrode arranged alternately along the first direction.

15. The method for preparing a photovoltaic module according to claim 14, characterized in that: The number of cells in each battery string is an odd number or an even number.

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