Battery string, photovoltaic module and preparation device of battery string

Abstract

The utility model relates to the technical field of solar cells, in particular to a cell string, a photovoltaic module and a preparation device of the cell string. The battery string provided by the utility model comprises a conductive connecting part and a plurality of battery pieces, and all the battery pieces are arranged side by side and are connected into a string through the conductive connecting part; fine grid lines are arranged on the front surfaces and the back surfaces of the battery pieces, and the length direction of the fine grid lines is the same as the arrangement direction of the battery pieces; the conductive connecting parts are arranged on the fine grid lines and are parallel to the fine grid lines. Only the thin grid lines are arranged on the battery pieces, the usage amount of silver paste is reduced, the main grid lines are prevented from shielding the photosensitive parts of the battery pieces, the photosensitive areas of the battery pieces are increased, the contact resistance is reduced, the photoelectric conversion rate of the battery string is improved, the whole thin grid lines are completely covered by the conductive connecting parts, all the battery pieces can be connected into the string, and the photoelectric conversion rate of the battery string is improved. And the arrangement form of the conductive connecting parts and the fine grid lines also has the advantages of small resistance, difficulty in circuit breaking and attractive appearance.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a battery string, a photovoltaic component and a preparation device of the battery string. Background Art

[0002] Generally, a solar cell includes a main grid line and a fine grid (also called a secondary grid) perpendicular to the main grid. The grid line is mostly printed with silver paste. According to different printing processes, solar cells are divided into three main grids, four main grids and multiple main grids. In the related welding technology, a battery string consisting of several battery cells in series is obtained by welding multiple battery cells printed with main grid lines and fine grid lines with welding strips. The current collected by the fine grids converges to the main grid and then to the welding strips, so that the conversion of light energy into electrical energy can be realized; however, this battery string obtained by welding the welding strips with the main grid lines not only has a large shading area, which affects the photoelectric conversion efficiency, but also has a high silver paste cost. Utility Model Content

[0003] The purpose of the utility model is to provide a battery string, a photovoltaic module and a preparation device for the battery string, so as to solve the technical problem that the battery string obtained by welding the welding strip and the main grid line not only has a large shading area, which affects the photoelectric conversion efficiency, but also has a high silver paste cost.

[0004] The utility model provides a battery string, comprising: a conductive connecting component formed of a conductive material and a plurality of battery cells, all of the battery cells are arranged side by side and connected into a string through the conductive connecting component, and in adjacent battery cells, the front side of one battery cell and the back side of another battery cell are connected through the conductive connecting component;

[0005] The front and back sides of the battery cell are both provided with fine grid lines, and the length direction of the fine grid lines is the same as the arrangement direction of the battery cell;

[0006] The conductive connection component is disposed on the fine gate line and is parallel to the fine gate line.

[0007] As a further technical solution, the cross-section of the conductive connecting component is circular, polygonal, arched or multi-arc.

[0008] As a further technical solution, the cross-section of the conductive connecting component is circular, and the cross-sectional diameter is between 0.02-0.15 mm.

[0009] As a further technical solution, the conductive connecting component is a soldering strip, a conductive adhesive, an aluminum plate, an aluminum foil or an aluminum wire.

[0010] As a further technical solution, a plurality of the fine grid lines are arranged on the front and back of the battery cell, the fine grid lines on the front of the battery cell correspond to the fine grid lines on the back of the battery cell one by one, and the number of the fine grid lines on each battery cell is the same;

[0011] There are a plurality of conductive connection components, and in adjacent battery cells, each of the thin grid lines on the front side of one battery cell is connected to the thin grid line on the back side of another battery cell in a one-to-one correspondence through one of the conductive connection components.

[0012] As a further technical solution, the interval between adjacent thin grid lines on the battery cell is between 0.5 mm and 1.5 mm.

[0013] As a further technical solution, it further comprises a diaphragm, the diaphragm is disposed on the front and back sides of the battery cell, and the conductive connecting component is located between the diaphragm and the battery cell.

[0014] The utility model provides a photovoltaic assembly, comprising the battery string.

[0015] The utility model provides a battery string preparation device, which is used to prepare the battery string, and includes a battery sheet feeding and cutting mechanism, a film feeding and cutting mechanism, a heating platform, a conductive material feeding and cutting mechanism, and a string transfer transmission and detection mechanism;

[0016] The battery sheet feeding and cutting mechanism is used to provide battery sheets and deliver them to the heating platform;

[0017] The film feeding and cutting mechanism is used to provide film sheets and deliver them to the heating platform;

[0018] The heating platform is provided with a first plane portion and a second plane portion for preparing a battery string, the first plane portion and the second plane portion are both used to carry battery cells and membranes, the height of the first plane portion is greater than the height of the second plane portion, and the height difference between the first plane portion and the second plane portion is equal to the thickness of the membrane;

[0019] The conductive material feeding and cutting mechanism is used to arrange conductive connection components on the fine grid lines on the front side of the cell and on the front side of the diaphragm along the length direction of the fine grid lines on the cell;

[0020] The string transfer and detection mechanism is used to transfer and detect the battery strings prepared on the heating platform.

[0021] As a further technical solution, the battery cell feeding and cutting mechanism is used to cut a whole sheet or a half sheet into battery cells and send them to the heating platform;

[0022] The string transfer and transmission detection mechanism is used to perform PL and / or EL detection on the battery string.

[0023] Compared with the prior art, the battery string, photovoltaic module and battery string preparation device provided by the utility model have the following technical advantages:

[0024] The utility model provides a battery string, comprising: a conductive connecting component and a plurality of battery cells, all of which are arranged side by side and connected into a string by the conductive connecting component, and in adjacent battery cells, the front side of one battery cell and the back side of another battery cell are connected by the conductive connecting component; fine grid lines are arranged on the front and back sides of the battery cells, and the length direction of the fine grid lines is the same as the arrangement direction of the battery cells; the conductive connecting component is arranged on the fine grid lines and is parallel to the fine grid lines.

[0025] Only fine grid lines are arranged on the battery cell, and no main grid lines are arranged, so as to reduce the usage of silver paste, lower the cost, and avoid the main grid lines blocking the photosensitive part of the battery cell, thereby increasing the photosensitive area of ​​the battery cell, reducing the contact resistance, and improving the photoelectric conversion rate of the battery string. At the same time, the conductive connecting components are located on the fine grid lines and are consistent with and parallel to the length direction of the fine grid lines, that is, the conductive connecting components are arranged on the fine grid lines in parallel along the length direction of the fine grid lines to cover the entire fine grid lines. The conductive connecting components can not only connect all the battery cells into a string, but also this arrangement of the conductive connecting components and the fine grid lines has the advantages of low resistance, not easy to break and beautiful appearance.

[0026] The photovoltaic module provided by the utility model includes the above-mentioned battery string, and thus the technical advantages and effects achieved by it include the technical advantages and effects achieved by the above-mentioned battery string, which will not be elaborated in detail here.

[0027] The battery string preparation device provided by the present invention is used to prepare the above-mentioned battery string. Therefore, the technical advantages and effects achieved by the device include the technical advantages and effects achieved by the above-mentioned battery string, which will not be elaborated in detail here.

[0028] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1A cross-sectional view of two battery cells provided in an embodiment of the utility model placed on a heating platform;

[0031] Figure 2 A front view schematic diagram of two battery cells provided by an embodiment of the utility model after the welding strips are arranged;

[0032] Figure 3 A cross-sectional view of four battery cells provided in an embodiment of the utility model placed on a heating platform;

[0033] Figure 4 A flow chart of the preparation process of a battery string provided in an embodiment of the utility model.

[0034] Icon: 1- soldering strip; 2- battery cell; 3- membrane; 4- heating platform; 5- first plane part; 6- second plane part. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0039] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0040] Specific structure such as Figures 1 to 4 shown.

[0041] The present embodiment provides a battery string, comprising: a conductive connecting component and a plurality of battery cells 2, wherein all the battery cells 2 are arranged side by side and connected into a string through the conductive connecting component; fine grid lines are arranged on the front and back sides of the battery cells 2, and the length direction of the fine grid lines is the same as the arrangement direction of the battery cells 2; the conductive connecting component is arranged on the fine grid lines and is parallel to the fine grid lines.

[0042] In the present embodiment, only fine grid lines are provided on the battery cell 2, but no main grid lines are provided, so that the use of silver paste is reduced, the cost is reduced, and the main grid lines are prevented from blocking the photosensitive part of the battery cell 2, thereby increasing the photosensitive area of ​​the battery cell 2, reducing the contact resistance, and improving the photoelectric conversion rate of the battery string. At the same time, the conductive connecting components are located on the fine grid lines and are consistent with and parallel to the length direction of the fine grid lines, that is, the conductive connecting components are arranged on the fine grid lines in parallel along the length direction of the fine grid lines to cover the entire fine grid lines. The conductive connecting components can not only connect all the battery cells 2 into a string, but also this arrangement of the conductive connecting components and the fine grid lines has the advantages of low resistance, not easy to break, and beautiful appearance.

[0043] In the optional technical solution of this embodiment, the cross-section of the conductive connection component is circular, polygonal, arched or multi-arc, but is not limited thereto, and may also be an irregular shape or a special shape to meet the needs.

[0044] Preferably, in this embodiment, the conductive connection component is cylindrical, and the cross-sectional diameter is between 0.02-0.15 mm, so as to ensure that the conductive connection component has high structural strength while covering the fine grid lines, and at the same time ensure the reliability of the performance.

[0045] In the optional technical solution of this embodiment, in adjacent battery cells 2, the front side of one battery cell 2 and the back side of another battery cell 2 are connected by a conductive connecting component. Thus, two adjacent battery cells 2 are connected in series, and the adjacent battery cells 2 are connected by a conductive connecting component, which reduces the required length of the conductive connecting component and reduces the cost. However, it is not limited to this, and the front sides of two adjacent battery cells 2 can also be connected by a conductive connecting component, as long as the requirements are met.

[0046] In the optional technical solution of this embodiment, the conductive connecting component is a soldering strip 1, a conductive adhesive, an aluminum plate, an aluminum foil or an aluminum wire, etc., as long as it is made of a conductive material that meets the requirements.

[0047] Preferably, the conductive connection component is a welding strip 1, and the welding strip 1 is a low-temperature welding strip. The low-temperature welding strip 1 is used to weld the fine grid lines, thereby increasing the aesthetics of the photovoltaic module.

[0048] In the optional technical solution of this embodiment, multiple fine grid lines are arranged on the front and back of the battery cell 2, the fine grid lines on the front of the battery cell 2 correspond one-to-one with the fine grid lines on the back of the battery cell 2, and the number of fine grid lines on each battery cell 2 is the same; multiple conductive connecting components are arranged, and in adjacent battery cells 2, each fine grid line on the front of a battery cell 2 is connected one-to-one with the fine grid line on the back of another battery cell 2 through a conductive connecting component. The ability of the battery cell 2 to collect current is improved, while ensuring the stability of the battery cell 2 in series.

[0049] In the optional technical solution of this embodiment, the interval between adjacent fine grid lines on the battery cell 2 is between 0.5mm and 1.5mm. While ensuring the performance of the battery cell 2, silver paste is saved. At the same time, since the conductive connecting components are covered on the fine grid lines, the interval between adjacent conductive connecting components is also between 0.5mm and 1.5mm. Preferably, the interval between adjacent conductive connecting components is also 1.5mm. At the same time, there are 140 to 200 fine grid lines, and the number of conductive connecting components is the same as that of fine grid lines.

[0050] The optional technical solution of this embodiment further includes a membrane 3, and the membrane 3 is provided on the front and back of the cell 2, and the conductive connecting component is located between the membrane 3 and the cell 2. The provision of the membrane 3 is not only convenient for bonding the back film, but also has an isolation effect to ensure the cell efficiency, and can also prevent reflection to improve the absorption rate and power generation efficiency of the photovoltaic cell.

[0051] A photovoltaic module provided in this embodiment includes the above-mentioned battery string. Therefore, the technical advantages and effects achieved by the photovoltaic module include the technical advantages and effects achieved by the above-mentioned battery string, which will not be repeated here.

[0052] The present embodiment provides a battery string preparation device, which prepares the above-mentioned battery string through the above-mentioned battery string preparation device, and includes a battery cell feeding and cutting mechanism, a film feeding and cutting mechanism, a heating platform 4, a conductive material feeding and cutting mechanism and a string transfer transmission detection mechanism; the battery cell feeding and cutting mechanism is used to provide battery cells 2 and send them to the heating platform 4, specifically, the battery cell feeding and cutting mechanism cuts the whole cell or half cell into battery cells 2 and sends them to the heating platform 4, but is not limited to this, and other forms of cells can also be cut into battery cells 2 and sent to the heating platform 4; the film feeding and cutting mechanism is used to provide film sheets 3 and send them to the heating platform 4, specifically, the film feeding and cutting mechanism cuts the roll film into film sheets 3 and sends them to the heating platform 4, but is not limited to this, and other forms of films can also be cut into film sheets 3 and sent to the heating platform 4. It is sent to the heating platform 4, wherein the film is a rubber film; the heating platform 4 is provided with a first plane portion 5 and a second plane portion 6 for preparing a battery string, and the first plane portion 5 and the second plane portion 6 are both used to carry the battery cell 2 and the membrane 3, the height of the first plane portion 5 is greater than the height of the second plane portion 6, and the height difference between the first plane portion 5 and the second plane portion 6 is equal to the thickness of the membrane 3; the conductive material feeding and cutting mechanism is used to arrange conductive connecting components on the fine grid lines on the front of the battery cell 2 and on the front of the membrane 3 along the length direction of the fine grid lines on the battery cell 2; the string transfer transmission detection mechanism is used to transfer and detect the battery string prepared on the heating platform 4, wherein the detection is mainly to detect the performance of the battery string, generally PL and / or EL detection, but not limited to this, and other performances of the battery string can also be detected. The thickness of the membrane 3 is between 0.05mm-0.5mm, and the height difference between the first plane portion 5 and the second plane portion 6 is also between 0.05mm-0.5mm. The specific preparation method of the fine grid lines is as follows:

[0053] The present embodiment provides a process for preparing a battery string, which is used to prepare the above-mentioned battery string and includes the following steps:

[0054] S1, providing a battery cell 2 and a membrane 3;

[0055] S2, adsorbing the battery cell 2 onto the first plane portion 5 of the heating platform 4, and adsorbing the membrane 3 onto the second plane portion 6 of the heating platform 4;

[0056] S3, arranging conductive connection components on the fine grid lines on the front side of the cell 2 and on the front side of the membrane 3 along the length direction of the fine grid lines on the cell 2;

[0057] S4, the battery cell 2, the membrane 3 and the conductive connecting components are fixed on the heating platform 4;

[0058] S5, adsorbing another membrane sheet 3 onto the top of the battery sheet 2 in S3;

[0059] S6, the heating platform 4 is heated, and the membrane 3 is fused to the battery cell 2 and the conductive connecting component to form two connected battery cells 2;

[0060] S7, moving the two connected battery cells 2 forward;

[0061] S8, repeating steps S1-S7, and stringing the first two connected battery cells 2 and the second two connected battery cells 2 in pairs;

[0062] S9, testing the battery cells 2 in series;

[0063] S10, the batteries are connected in series.

[0064] In the optional technical solution of this embodiment, providing the battery cell 2 in S1 includes the steps of: loading the whole or half of the battery cell, cutting the whole or half of the battery cell into battery cells 2 without loss, and inspecting the appearance of the battery cell 2;

[0065] Providing the film sheet 3 in S1 includes the steps of: feeding the film roll, conveying the film roll by belt operation, and stretching and cutting the film roll into the film sheet 3;

[0066] In S3, the conductive connecting components are arranged on the fine grid lines on the front side of the battery cell 2 and on the front side of the diaphragm 3 along the length direction of the fine grid lines on the battery cell 2, including the following steps: supplying conductive material, aligning the conductive material with the fine grid lines of the battery cell 2, arranging the conductive material on the battery cell 2 and the diaphragm 3, and cutting the conductive material; wherein the conductive material on the battery cell 2 and the diaphragm 3 is arranged along the extension direction of the fine grid lines.

[0067] In S5 , another film sheet 3 is adsorbed onto the top of the battery cell 2 in S3 , including the steps of: film roll feeding, belt operation to convey the film roll, film roll stretching and cutting into film sheets 3 , and adsorbing the film sheet 3 onto the top of the battery cell 2 .

[0068] It should be noted that in step S5, the membrane 3 in step S1 can be directly adsorbed onto the top of the battery cell 2 in S3, or a separate membrane feeding and cutting mechanism can be set up, that is, two membrane feeding and cutting mechanisms are set up, one for step S1 and the other for step S5.

[0069] In S9, the battery cells 2 connected in series are tested, mainly to test the performance of the battery string, generally PL and / or EL testing is performed, but it is not limited to this, and other performances of the battery string can also be tested.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery string, characterized in that: include: A conductive connecting component formed of a conductive material and a plurality of battery cells (2), wherein all of the battery cells (2) are arranged side by side and connected in series via the conductive connecting component, and in adjacent battery cells (2), the front side of one battery cell (2) and the back side of another battery cell (2) are connected via the conductive connecting component; The front and back sides of the battery cell (2) are both provided with fine grid lines, and the length direction of the fine grid lines is the same as the arrangement direction of the battery cell (2); The conductive connection component is disposed on the fine gate line and is parallel to the fine gate line.

2. The battery string according to claim 1, characterized in that: The cross section of the conductive connecting component is circular, polygonal, arched or multi-arc.

3. The battery string according to claim 2, characterized in that: The cross section of the conductive connecting component is circular, and the cross section diameter is between 0.02-0.15 mm.

4. The battery string according to claim 1, characterized in that: The conductive connection component is a welding strip (1), a conductive adhesive, an aluminum plate, an aluminum foil or an aluminum wire.

5. The battery string according to claim 1, characterized in that: A plurality of the fine grid lines are arranged on the front and back of the battery cell (2), the fine grid lines on the front of the battery cell (2) correspond one to one with the fine grid lines on the back of the battery cell (2), and the number of the fine grid lines on each battery cell (2) is the same; A plurality of the conductive connection components are provided, and in adjacent battery cells (2), each of the fine grid lines on the front side of one battery cell (2) is connected one-to-one with the fine grid line on the back side of another battery cell (2) via one of the conductive connection components.

6. The battery string according to claim 5, characterized in that: The interval between adjacent fine grid lines on the battery cell (2) is between 0.5 mm and 1.5 mm.

7. The battery string according to claim 1, characterized in that: It also comprises a membrane (3), the membrane (3) being arranged on the front and back sides of the battery cell (2), and the conductive connection component being located between the membrane (3) and the battery cell (2).

8. A photovoltaic module, characterized in that: A battery string comprising any one of claims 1 to 7.

9. A battery string preparation device, characterized in that: Used to prepare the battery string according to any one of claims 1 to 7, comprising a battery sheet feeding and cutting mechanism, a film feeding and cutting mechanism, a heating platform (4), a conductive material feeding and cutting mechanism and a string transfer transmission and detection mechanism; The battery cell feeding and cutting mechanism is used to provide battery cells (2) and deliver them to the heating platform (4); The film feeding and cutting mechanism is used to provide the film sheet (3) and deliver it to the heating platform (4); The heating platform (4) is provided with a first plane portion (5) and a second plane portion (6) for preparing a battery string, the first plane portion (5) and the second plane portion (6) are both used to carry the battery sheet (2) and the membrane (3), the height of the first plane portion (5) is greater than the height of the second plane portion (6), and the height difference between the first plane portion (5) and the second plane portion (6) is equal to the thickness of the membrane (3); The conductive material feeding and cutting mechanism is used to arrange conductive connection components on the fine grid lines on the front side of the battery cell (2) and on the front side of the membrane (3) along the length direction of the fine grid lines on the battery cell (2); The string transfer and detection mechanism is used to transfer and detect the battery strings prepared on the heating platform (4).

10. The battery string manufacturing device according to claim 9, characterized in that: The battery cell feeding and cutting mechanism is used to cut a whole sheet or a half sheet into battery cells (2) and send them to the heating platform (4); The string transfer and transmission detection mechanism is used to perform PL and / or EL detection on the battery string.

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