Battery assembly and photovoltaic system
By setting multiple solder points at the edge of the battery cell and optimizing the welding structure using insulating strips and busbars, the welding difficulty caused by the small distance between solder points at the edge of the battery cell was solved, improving the welding feasibility and power generation efficiency of the battery module and reducing production costs.
Patent Information
- Application Number
- CN202520362495.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-03
AI Technical Summary
In the design of solar cells, the distance between the solder joints at the edge of the solar cell is very small. This results in the distance between the solder joints of adjacent solar cells being less than the width of the spacer strip and busbar, making it impossible to weld effectively. This leads to problems such as weakened current collection in the solder strip and solder strip desoldering or poor soldering.
By setting multiple solder points on the edge of the solar cell and placing insulating strips and busbars between the solder points, the distance between the solder points is greater than the width of the insulating strips or busbars, ensuring welding feasibility. Furthermore, the connection structure of the solder strip is optimized by using conductive components to improve carrier collection efficiency.
This improved the welding feasibility and carrier collection efficiency of battery modules, enhanced the power generation efficiency of battery modules, and reduced production costs and welding defect rates.
Smart Images
Figure CN223859550U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of photovoltaics, and particularly relates to a battery assembly and a photovoltaic system. BACKGROUND
[0002] Solar cells or cell pieces can convert solar energy into electrical energy, and they use clean energy, so they have a wide application prospect. Since the output voltage of a single solar cell is low, a certain number of solar cells are usually connected in series through bus bars to form a cell string to expand its application scenarios. In a conventional cell piece design, the distance between the welding points at the edges of the cell pieces and the edges of the cell pieces is small. After a plurality of cell pieces are connected to form a cell assembly, the distance between the welding points at the edges of the two adjacent cell pieces is smaller than the width of the isolation strip or the bus bar, and the welding strip cannot be connected to the welding points at the edges of the cell pieces, so that the current at the edges of the cell pieces cannot be collected. Especially for 0BB cell pieces (cell pieces without main grid), only welding points are arranged at the edges of the cell pieces, and the welding strip cannot be connected to the welding points at the edges of the cell pieces, which not only causes the current at the edges of the cell pieces to be lost, but also causes the welding strip to be disconnected from the cell pieces and to be falsely welded. CONTENT OF THE UTILITY MODEL
[0003] The application provides a battery assembly, which aims to solve the problem that, in a cell piece design, the distance between the welding points at the edges of the cell pieces and the edges of the cell pieces is very small, so that when a bus bar and an isolation strip are arranged, the distance between the welding points of adjacent cell pieces is smaller than the width of the isolation strip and the bus bar, thereby causing the assembly to be unable to be welded.
[0004] The application is implemented in the following manner. A battery assembly includes a first cell piece and a second cell piece arranged adjacent to each other along a first direction, a plurality of first welding points arranged along a second direction near an edge of the second cell piece close to the first cell piece, and a plurality of second welding points arranged along the second direction near an edge of the first cell piece close to the second cell piece. An insulation strip and a bus bar are arranged between the first welding points and the second welding points, and the insulation strip and the bus bar are arranged in a stacked manner in a third direction. In the first direction, the minimum distance between the first welding points and the second welding points is greater than the width of the insulation strip or the bus bar.
[0005] Optionally, the first welding points and the second welding points are arranged correspondingly in the first direction.
[0006] Optionally, the plurality of first welding points are arranged at a first distance apart in the second direction, and the plurality of second welding points are arranged at a second distance apart in the second direction, and the first distance and the second distance are equal.
[0007] Optionally, the battery assembly comprises a first conductive member and a second conductive member oppositely arranged on two sides of the first solder joint in the first direction, the first conductive member extends towards one side away from the first solder joint, and the second conductive member extends towards another side away from the first solder joint.
[0008] Optionally, the first conductive member extends towards the second battery sheet, and a length of the first conductive member is greater than 0 and less than or equal to 10 mm.
[0009] Optionally, in the first direction, a distance between the first conductive member and an edge of the first battery sheet is greater than or equal to 0 and less than 10 mm.
[0010] Optionally, the second conductive member extends towards the first battery sheet, and a length of the second conductive member is greater than 0 and less than or equal to 90 mm.
[0011] Optionally, the battery assembly comprises a third conductive member and a fourth conductive member oppositely arranged on two sides of the second solder joint in the first direction, the third conductive member extends towards one side away from the second solder joint, and the fourth conductive member extends towards another side away from the second solder joint.
[0012] Optionally, the third conductive member extends towards the first battery sheet, and a length of the third conductive member is greater than 0 and less than or equal to 10 mm.
[0013] Optionally, in the first direction, a distance between the third conductive member and an edge of the second battery sheet is greater than or equal to 0 and less than 10 mm.
[0014] Optionally, the fourth conductive member extends towards the second battery sheet, and a length of the fourth conductive member is greater than 0 and less than or equal to 90 mm.
[0015] Optionally, in the first direction, the first battery sheet and the second battery sheet are partially overlapped to form an overlapping area.
[0016] Optionally, the insulating strip and the busbar are stacked in the third direction in the overlapping area.
[0017] Optionally, the first battery sheet and the second battery sheet are partially overlapped by a distance greater than or equal to 0.2 mm and less than or equal to 1.2 mm.
[0018] Optionally, the first battery sheet has a plurality of first edge corners, each of the plurality of first edge corners is a chamfered structure, and / or the second battery sheet has a plurality of second edge corners, each of the plurality of second edge corners is a chamfered structure.
[0019] The present application sets the minimum distance between the first soldering point on the first battery piece and the second soldering point on the second battery piece to be greater than the width of the insulation strip or the bus bar, thereby meeting the requirement that the insulation strip and the bus bar are placed between the first soldering point and the second soldering point, without affecting the welding of the battery assembly, increasing the welding feasibility of the battery assembly, and effectively welding the solder strip and the soldering point, improving the carrier collection efficiency of the battery assembly, and thereby improving the power generation efficiency of the battery assembly. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a structural schematic diagram of a first battery assembly provided by the present application;
[0021] Figure 2 is Figure 1 is an enlarged view of the structure at A of
[0022] Figure 3 is a structural schematic diagram of a battery assembly in the prior art;
[0023] Figure 4 is a structural schematic diagram of a second battery assembly provided by the present application;
[0024] Figure 5 is a structural schematic diagram of a third battery assembly provided by the present application;
[0025] Figure 6 is a structural schematic diagram of a first battery piece of a battery assembly provided by the present application;
[0026] Figure 7 is a structural schematic diagram of a second battery piece of a battery assembly provided by the present application.
[0027] BRIEF DESCRIPTION OF DRAWINGS
[0028] 100, first battery piece; 101, first soldering point; 102, first conductive piece; 103, second conductive piece; 200, second battery piece; 201, second soldering point; 202, third conductive piece; 203, fourth conductive piece; 300, insulation strip; 400, bus bar; 500, solder strip; 600, p-type gate line; 700, n-type gate line. DETAILED DESCRIPTION
[0029] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein identical or similar labels denote identical or similar elements or elements with identical or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only and are merely intended to explain the present application, and are not to be understood as limiting the present application. In addition, it should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.
[0030] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.
[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0033] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0034] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements of the particular examples are described in the following disclosure. Of course, they are merely examples and are not intended to be limiting of the present application. Also, the present application can repeat reference numerals and / or letters in various examples and / or throughout the specification. This repetition is for the purpose of simplicity and clarity and is not in itself intended to indicate a relationship between the various embodiments and / or configurations discussed herein. Furthermore, various specific processes and materials are described in this disclosure, but the application can be practiced with other processes and / or materials.
[0035] As Figure 3 shown in the prior art, for example, back contact cell, when packaged into a photovoltaic module, in order to meet the needs of the line scanning of laser welding, the bus bar needs to be placed on the back of the cell. In the electrode pattern design of the cell, the distance between the welding point of the cell edge and the cell edge is very small, thereby causing the distance between the welding points of adjacent cells to be less than the width of the isolation strip and the bus bar when the cells are arranged, resulting in the inability of the ribbon 500 to effectively weld with the welding points, thereby causing the current collection of the ribbon 500 to be weakened.
[0036] As Figure 1As shown, in the embodiments of the present application, a battery assembly includes a first battery sheet 100 and a second battery sheet 200 arranged adjacent to each other in a first direction. In some embodiments, the first battery sheet 100 and the second battery sheet 200 are connected in series to form a battery string. It can be understood that in the battery string, the battery string can include two battery sheets connected in series, three battery sheets connected in series, or more battery sheets connected in series. The number of battery sheets connected in series can be determined according to actual use, and the present application does not limit the number of battery sheets connected in series. Exemplarily, the end where the first battery sheet 100 is located is recorded as the tail end of the battery string, that is, in the first direction, the first battery sheet 100 is the last battery sheet of the battery string, and the second battery sheet 200 is the second last battery sheet of the battery string. It can be understood that the end where the first battery sheet 100 is located can also be recorded as the head end of the battery string, and the second battery sheet 200 is the second battery sheet of the battery string. At this time, the bus bar 400 can be used for series connection between battery strings adjacent to each other in a second direction. In other embodiments, the end where the first battery sheet 100 is located is recorded as the tail end of a battery string, that is, in the first direction, the first battery sheet 100 is the last battery sheet of a battery string, and the end where the second battery sheet 200 is located is recorded as the head end of another battery string, that is, the second battery sheet 200 is the first battery sheet of the adjacent battery string. The first battery sheet 100 and the second battery sheet 200 are connected in parallel at this time. The bus bar 400 can be used for parallel connection between battery strings adjacent to each other in the first direction. At this time, the bus bar 400 is equivalent to an intermediate bus bar in the battery assembly. In addition, the grid lines on the battery sheets are not shown in the drawings. The grid lines on the battery sheets can be arranged according to actual conditions, for example, the battery sheets can be main grid battery sheets, or the battery sheets can be main grid-free battery sheets.
[0037] In some embodiments, the first battery piece 100 is provided with a plurality of first soldering points 101 along the second direction close to the edge of the second battery piece 200, and the second battery piece 200 is provided with a plurality of second soldering points 201 along the second direction close to the edge of the first battery piece 100, that is, the first soldering points 101 are the soldering points closest to the edge of the first battery piece, and the second soldering points 201 are the soldering points closest to the edge of the second battery piece. In the embodiments of the present application, the first soldering points 101 and the second soldering points 201 can be connection points for soldering the solder ribbons 500 only, that is, when the solder ribbons 500 are soldered subsequently, the first soldering points 101 and the second soldering points 201 can serve as the positions for soldering with the solder ribbons 500. Since the first soldering points 101 and the second soldering points 201 are connected with a plurality of fine grids respectively, it is not necessary to provide soldering points or soldering layers on all the fine grids during soldering, which can reduce the use of soldering paste. In other embodiments, the first soldering points 101 and the second soldering points 201 can also be pad points, which can be used for contacting the positive and negative probes of the testing equipment respectively. In this way, by providing a plurality of first soldering points 101 and a plurality of second soldering points 201, the positive and negative probes of the testing equipment can form stable contact with the first soldering points 101 and the second soldering points 201 during the hot spot test, EL test and other tests on the solar battery piece, which can reduce the testing difficulty and improve the testing reliability and stability.
[0038] It can be understood that a plurality of solder ribbons are provided on the first battery piece 100 along the second direction, and a plurality of solder ribbons are also provided on the second battery piece 200 along the second direction. The plurality of solder ribbons on the first battery piece 100 are connected with the plurality of first soldering points 101 on the first battery piece 100 one by one, and the plurality of solder ribbons on the second battery piece 200 are connected with the plurality of second soldering points 201 on the second battery piece 200 one by one. The provision of the first soldering points 101 can fix the solder ribbons on the first battery piece 100, and the provision of the first soldering points 101 can also serve as a busbar. Similarly, the provision of the second soldering points 201 can fix the solder ribbons on the second battery piece 200, and the provision of the second soldering points 201 can also serve as a busbar.
[0039] In some embodiments, the insulating strip 300 and the bus bar 400 are arranged between the first solder joint 101 and the second solder joint 201. That is, the insulating strip 300 and the bus bar 400 are located between the first solder joint 101 and the second solder joint 201, specifically, the insulating strip 300 and the bus bar 400 can be arranged at the edge of the first battery piece 100 close to the second battery piece 200; the insulating strip 300 and the bus bar 400 can also be arranged at the edge of the second battery piece 200 close to the first battery piece 100; the insulating strip 300 and the bus bar 400 can also be partially arranged at the edge of the first battery piece 100 close to the second battery piece 200 and partially arranged at the edge of the second battery piece 200 close to the first battery piece 100, as long as the insulating strip 300 and the bus bar 400 are located between the first solder joint 101 and the second solder joint 201, which is not limited in the present application. Preferably, the insulating strip 300 and the bus bar 400 are partially arranged at the edge of the first battery piece 100 close to the second battery piece 200 and partially arranged at the edge of the second battery piece 200 close to the first battery piece 100, so that the distance between the first solder joint 101 and the edge of the first battery piece 100 and the distance between the second solder joint 201 and the edge of the second battery piece 200 are substantially the same, thereby realizing effective bus bar of the current carrying particles at the edge of the battery piece after the solder joint is connected with the solder strip 500.
[0040] The insulating strip 300 and the bus bar 400 are arranged in the third direction, specifically, the insulating strip 300 is arranged between the bus bar 400 and the first battery piece 100 and / or the second battery piece 200, and the insulating strip 300 is used to isolate the bus bar 400 and the solder strip 500 with different polarity on the battery piece.
[0041] In the embodiments of the present application, the second direction intersects the first direction. Specifically, the second direction can be perpendicular to the first direction. The third direction intersects the first direction and the second direction, and the third direction is perpendicular to the first direction and the second direction, for example, the first direction can be the width direction of the battery piece, the second direction can be the length direction of the battery piece, and the third direction can be the thickness direction of the battery piece.
[0042] For example, the material of the bus bar 400 can be a tin-plated copper bus bar, a conductive copper foil or an aluminum-based copper strip. The insulating strip 300 can be an insulating glue, or a non-conductive adhesive tape or an insulating film, such as a PET or PI adhesive tape with acrylic or silicone glue, or a PET or PI substrate with single-sided or double-sided film-coated ethylene-vinyl acetate copolymer or hot melt adhesive. It can be understood that the insulating strip 300 can include ethylene-vinyl acetate copolymer, resin material, polyimide or polypropylene or polyethylene material, and can also include an acrylic adhesive layer.
[0043] It should be noted that the thickness of the insulation strip 300 cannot be too thick or too thin. If the insulation strip 300 is too thin, it is inconvenient to operate when pasting, and it is easy to deform when pulling. Long-term insulation also has the risk of damage. If it is too thick, it will increase the height difference, the stress generated during the lamination process will be large, and it is easy to cause fragmentation, increasing the risk of virtual welding of the solder strip 500. Based on this, in the embodiments of the present application, the thickness of the insulation strip 300 can be set to between 0.05 mm and 0.8 mm. In this way, the insulation strip 300 will neither be too thin nor too thick. For example, the thickness of the insulation strip 300 can be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm. Among them, the width of the insulation strip 300 is greater than or equal to the width of the bus bar 400. If the width of the insulation strip 300 is too narrow, the bus bar 400 will be exposed, and there is a risk that the bus bar 400 will contact the opposite electrode area or the opposite solder strip 500 and short circuit.
[0044] As shown in Figure 2 , Figure 4 , Figure 6 and Figure 7 , in some embodiments, a part of the plurality of first solder points 101 connects the p-type gate line 600, and another part of the plurality of first solder points 101 connects the n-type gate line 700. The distance between the first solder points 101 of the two polarities and the edge of the first cell piece 100 can be the same or different, and is designed according to the actual needs of the electrode pattern. For example, if the distance between the first solder points 101 of the two polarities and the edge of the first cell piece 100 is different, the difference between the distance between the first solder points 101 of the two polarities and the edge of the first cell piece 100 can be greater than 0 and less than or equal to 1 mm. Similarly, a part of the plurality of second solder points 201 connects the p-type gate line 600, and another part of the plurality of second solder points 201 connects the n-type gate line 700. The distance between the second solder points 201 of the two polarities and the edge of the second cell piece 200 can be the same or different. If the distance between the second solder points 201 of the two polarities and the edge of the second cell piece 200 is different, the difference between the distance between the second solder points 201 of the two polarities and the edge of the second cell piece 200 can be greater than 0 and less than or equal to 1 mm. It can be understood that the size considered when arranging the battery assembly is set according to the solder points closer to the edge of the cell piece, that is, in the first direction, the minimum distance L between the first solder point 101 and the second solder point 201 is greater than the width D1 of the insulation strip 300 or the width D2 of the bus bar 400. Thus, it meets the demand that the isolation strip and the bus bar 400 are placed between the first solder point 101 and the second solder point 201, does not affect the welding of the battery assembly, increases the welding feasibility of the battery assembly, and the solder strip 500 and the solder point can be effectively welded, improves the carrier collection efficiency of the battery assembly, and further improves the power generation efficiency of the battery assembly.
[0045] In some embodiments, the first solder joint 101 and the second solder joint 201 are correspondingly arranged in a first direction. That is, a plurality of first solder joints 101 and a plurality of second solder joints 201 are arranged one-to-one in the first direction. By aligning the first solder joints 101 and the second solder joints 201 in the first direction (such as the width direction of the cell), a straight interconnection structure between adjacent cells can be formed, shortening the carrier transport path and reducing local resistance loss.
[0046] Multiple first solder joints 101 are arranged at a first distance interval in a second direction, and multiple second solder joints 201 are arranged at a second distance interval in the second direction, with the first and second distances being equal. Because the intervals between the solder joints are equal, the welding process is simplified, resulting in a more uniform and consistent welding process. This helps improve welding efficiency and reduce errors and defect rates during welding. Solder joints, as nodes for current transmission, play a crucial role in solar cells. The equidistant solder joint layout ensures uniform current distribution within the cell, reducing losses and heat generation during current transmission, thereby improving the conversion efficiency of the solar cell. Furthermore, the equidistant solder joint layout enhances the overall mechanical strength of the solar cell, making it more robust and durable, and able to withstand greater external forces and environmental changes.
[0047] like Figure 5 As shown, in some embodiments, the battery assembly includes a first conductive element 102 and a second conductive element 103 disposed opposite to each other on both sides of the first solder joint 101 in a first direction. The first conductive element 102 extends away from the first solder joint 101 toward one side, and the second conductive element 103 extends away from the first solder joint 101 toward the other side. The first conductive element 102, the second conductive element 103, and the first solder joint 101 together constitute the interconnection structure of the solder strip 500. Through the above structural design, when the solder paste deviates from the position of the first solder joint 101, the arrangement of the first conductive element 102 and the second conductive element 103 can ensure the electrical connection between the solder strip 500 and the edge of the first battery cell 100, and the battery current collection will not be reduced, thereby ensuring the power of the assembly. Specifically, the first conductive element and the second conductive element can be formed by printing with silver paste.
[0048] Further, the first conductive member 102 extends towards the second battery sheet 200, and the length of the first conductive member 102 is greater than 0 and less than or equal to 10 mm. Preferably, the length of the first conductive member 102 is greater than or equal to 2 mm and less than or equal to 10 mm. For example, the length of the first conductive member 102 is 2 mm, 5 mm, 8 mm, 10 mm, or the like. The length of the first conductive member 102 in this range can ensure that the solder paste has a large deviation redundancy when deviated towards the side of the first conductive member 102, reduce the process requirements of the spot welding position of the solder paste, and thus improve the yield of the battery assembly. Understandably, in other embodiments, the length of the first conductive member 102 can also be represented by the number of connected fine grid lines. For example, the first conductive member 102 extends in the first direction and connects four fine grid lines of the same polarity, and the size of the first conductive member 102 can also meet the requirements.
[0049] In some embodiments, in the first direction, the interval distance between the first conductive member 102 and the edge of the first battery sheet 100 is greater than or equal to 0 and less than 10 mm. For example, the interval distance between the first conductive member 102 and the edge of the first battery sheet 100 can be 0 mm, 3 mm, 8 mm, 9 mm, or the like, and the application does not make a limitation.
[0050] In some embodiments, the second conductive member 103 extends away from the second battery sheet 200, and the length of the second conductive member 103 is greater than 0 and less than or equal to 90 mm. Preferably, the length of the second conductive member 103 is greater than or equal to 5 mm and less than or equal to 90 mm. For example, the length of the second conductive member 103 is 5 mm, 10 mm, 20 mm, 30 mm, 50 mm, 80 mm, 90 mm, or the like. The length of the second conductive member 103 in this range can ensure that the solder paste has a large deviation redundancy when deviated towards the side of the second conductive member 103, reduce the process requirements of the spot welding position of the solder paste, and thus improve the yield of the battery assembly. Understandably, in other embodiments, the length of the second conductive member 103 can also be represented by the number of connected fine grid lines. For example, the second conductive member 103 extends in the first direction and connects three fine grid lines of the same polarity, and the size of the second conductive member 103 can also meet the requirements.
[0051] In some embodiments, the battery assembly includes a third conductive member 202 and a fourth conductive member 203 disposed opposite to the second solder joint 201 in the first direction, the third conductive member 202 extends towards one side away from the second solder joint 201, and the fourth conductive member 203 extends towards the other side away from the second solder joint 201. The third conductive member 202, the fourth conductive member 203 and the second solder joint 201 together form an interconnection structure of the solder strip 500. Through the above structure design, when the solder paste deviates from the position of the second solder joint 201, the third conductive member 202 and the fourth conductive member 203 can ensure the electrical connection between the solder strip 500 and the edge of the second battery sheet 200, and the battery current collection will not be reduced, thereby ensuring the power of the assembly. Specifically, the third conductive member and the fourth conductive member can be formed by silver paste printing.
[0052] Further, the third conductive member 202 extends towards the first battery sheet 100 in the first direction, and the length of the third conductive member 202 is greater than 0 and less than or equal to 10 mm. Preferably, the length of the third conductive member 202 is greater than or equal to 2 mm and less than or equal to 10 mm. Exemplarily, the length of the third conductive member 202 is 2 mm, 5 mm, 8 mm or 10 mm, etc. The length of the third conductive member 202 in this range can ensure that the solder paste has a large deviation redundancy when deviating towards the side of the third conductive member 202, reduce the process requirements of the spot welding position of the solder paste, and further improve the yield of the battery assembly. It can be understood that in other embodiments, the length of the third conductive member 202 can also be represented by the number of connected fine grid lines, for example, the third conductive member 202 extends in the first direction and connects four fine grid lines of the same polarity, and the size of the third conductive member 202 can also meet the requirements.
[0053] Further, in the first direction, the spacing distance between the third conductive member 202 and the edge of the second battery sheet 200 is greater than or equal to 0 and less than 10 mm. Exemplarily, the spacing distance between the third conductive member 202 and the edge of the second battery sheet 200 can be 0 mm, 3 mm, 8 mm or 9 mm, etc., and the application does not make a limitation in comparison.
[0054] In some embodiments, the fourth conductive member 203 extends away from the first battery sheet 100, and the length of the fourth conductive member 203 is greater than 0 and less than or equal to 90 mm. Preferably, the length of the fourth conductive member 203 is greater than or equal to 5 mm and less than or equal to 90 mm. For example, the length of the fourth conductive member 203 is 5 mm, 10 mm, 20 mm, 30 mm, 50 mm, 80 mm, 90 mm, or the like. When the length of the fourth conductive member 203 is within this range, it can ensure that the solder paste has a large deviation redundancy when deviating from the side facing the fourth conductive member 203, thereby reducing the process requirements of the spot welding position of the solder paste, and further improving the yield of the battery assembly. It can be understood that in other embodiments, the length of the fourth conductive member 203 can also be represented by the number of connected fine grid lines, for example, the fourth conductive member 203 extends in the first direction and connects three fine grid lines of the same polarity. The size of the second conductive member 103 can also meet the requirements.
[0055] In some embodiments, the first battery sheet 100 and the second battery sheet 200 are partially overlapped in the first direction. The contact area between the overlap is not conductively connected, that is, no conductive adhesive or other adhesive is needed between the overlap area, and the battery sheets are simply overlapped. In this way, there is no gap between the first battery sheet 100 and the second battery sheet 200, so that the solder strip 500 and the bus bar can be better hidden, and there is no need to set a shielding insulating layer in the gap between the battery sheets to hide the solder strip 500, thereby reducing the use of the shielding insulating layer, reducing the production cost, and making it more convenient to repair. Moreover, by overlapping the battery sheets, the size of the battery assembly can be reduced, thereby occupying less space. Or, in the case of a certain size of the battery assembly, more battery sheets can be placed, the power of the battery assembly is improved, and the cost per watt is reduced. Preferably, the partially overlapped distance of the first battery sheet 100 and the second battery sheet 200 is greater than or equal to 0.2 mm and less than or equal to 1.2 mm. For example, the overlap width can be 0.2 mm, 0.4 mm, 0.5 mm, 1 mm, or 1.2 mm, which is not limited in the present application.
[0056] In some embodiments, the insulating strip 300 and the bus bar 400 are stacked in the third direction in the overlap area. That is, the insulating strip 300 can cover the edges of the second battery sheet 200 and the first battery sheet 100. This allows the insulating strip 300 to have a certain degree of offset in the width direction relative to the bus bar 400 and the insulating strip 300 relative to the two battery sheets during the preparation process, thereby reducing the production precision requirement and production difficulty. On the other hand, it can avoid the contact between the bus bar 400 and the heterogeneous solder strip 500 / heterogeneous grid line on the battery sheet to cause short circuit, further reduce the risk of short circuit, and improve the reliability of the battery assembly.
[0057] In some embodiments, the first battery piece 100 and the second battery piece 200 are arranged on the same plane, and the first battery piece 100 and the second battery piece 200 are arranged at intervals. In this way, a buffer space is provided between the battery pieces, so that the battery pieces will not be damaged by mutual contact when the battery assembly is affected by external force. In such embodiments, the interval distance between the first battery piece 100 and the second battery piece 200 can be 0 mm, 1 mm, 2 mm, 3 mm, or any value between 0 mm and 3 mm, which is not limited in particular herein. Within this range, while reducing the risk of battery piece stacking, the stability of the connection between adjacent battery pieces is improved.
[0058] In the related art, when the battery piece is subjected to laser welding, the cutting (right angle) edge of the battery piece will be damaged due to welding energy and lamination pressure. In the embodiments of the present application, the first battery piece 100 has a plurality of first edge angles, each of the plurality of first edge angles being a chamfer structure, and / or the second battery piece 200 has a plurality of second edge angles, each of the plurality of second edge angles being a chamfer structure. In this way, the problem of the battery piece being easily damaged during the lamination process after the battery piece is stacked can be avoided, and the chamfering process of the battery piece can enhance the mechanical strength of the edge of the battery piece, making it more resistant to mechanical impact and reducing the risk of breakage or damage caused by external force during processing, transportation and installation.
[0059] A photovoltaic system includes a battery assembly. In the embodiments, the photovoltaic system can be applied in a photovoltaic power station, such as a ground power station, a roof power station, a water surface power station, etc., and can also be applied in a device or apparatus that utilizes solar energy to generate electricity, such as a user solar power source, a solar street lamp, a solar car, a solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that need to utilize solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a combiner box and an inverter, the photovoltaic array can be an array combination of a plurality of battery assemblies, for example, a plurality of battery assemblies can form a plurality of photovoltaic arrays, the photovoltaic arrays are connected to the combiner box, the combiner box can combine the currents generated by the photovoltaic arrays, the combined current flows through the inverter to convert into alternating current required by the power grid, and then the alternating current is connected to the power grid to realize solar power supply.
[0060] In the description of the present specification, the description of the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0061] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A battery assembly, comprising: The battery assembly comprises a first cell and a second cell arranged adjacent to each other along a first direction, the first cell is provided with a plurality of first soldering points along a second direction near an edge of the second cell, the second cell is provided with a plurality of second soldering points along the second direction near an edge of the first cell; an insulating strip and a busbar arranged between the first soldering points and the second soldering points, the insulating strip and the busbar are arranged in a third direction in a stack manner; in the first direction, a minimum distance between the first soldering points and the second soldering points is greater than a width of the insulating strip or the busbar.
2. The battery assembly of claim 1, wherein, The first soldering points and the second soldering points are arranged correspondingly in the first direction.
3. The battery assembly of claim 1, wherein, The first soldering points are arranged at a first distance in the second direction, the second soldering points are arranged at a second distance in the second direction, and the first distance is equal to the second distance.
4. The battery assembly of claim 1, wherein, The battery assembly comprises a first conductive member and a second conductive member arranged on two sides of the first soldering point in the first direction, the first conductive member extends away from the first soldering point towards one side, and the second conductive member extends away from the first soldering point towards the other side.
5. The battery assembly of claim 4, wherein, The first conductive member extends towards the second cell, and a length of the first conductive member is greater than 0 and less than or equal to 10 mm.
6. The battery assembly of claim 4, wherein, In the first direction, a distance between the first conductive member and the edge of the first cell is greater than or equal to 0 and less than 10 mm.
7. The battery assembly of claim 4, wherein, The second conductive member extends away from the second cell, and a length of the second conductive member is greater than 0 and less than or equal to 90 mm.
8. The battery assembly of claim 1, wherein, The battery assembly comprises a third conductive member and a fourth conductive member arranged on two sides of the second soldering point in the first direction, the third conductive member extends away from the second soldering point towards one side, and the fourth conductive member extends away from the second soldering point towards the other side.
9. The battery assembly of claim 8, wherein, The third conductive member extends towards the first cell, and a length of the third conductive member is greater than 0 and less than or equal to 10 mm.
10. The battery assembly of claim 8, wherein, In the first direction, a distance between the third conductive member and the edge of the second cell is greater than or equal to 0 and less than 10 mm.
11. The battery assembly of claim 8, wherein, The fourth conductive member extends away from the first cell, and a length of the fourth conductive member is greater than 0 and less than or equal to 90 mm.
12. The battery assembly of claim 1, wherein, In the first direction, the first cell and the second cell are arranged partially overlapped to form an overlapping area.
13. The battery assembly of claim 12, wherein, The insulating strip and the busbar are arranged in the third direction in a stack manner in the overlapping area.
14. The battery assembly of claim 12, wherein, A partially overlapping distance between the first cell and the second cell is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.
15. The battery assembly of claim 1, wherein, The first cell has a plurality of first corners, each of the plurality of first corners is a chamfer structure, and / or the second cell has a plurality of second corners, each of the plurality of second corners is a chamfer structure.
16. A photovoltaic system characterized by, The battery assembly comprises the battery assembly according to any one of claims 1-15.