A battery cell, a shingled assembly and a shingled machine
By setting a buckle part at the end of the main gate line of the battery cell and connecting the battery cell by buckle method, the welding tape coverage problem is solved, and welding tape connection is achieved, cost is reduced and production efficiency is improved.
Patent Information
- Application Number
- CN202111511052.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-10
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2041-12-10
AI Technical Summary
In the production of battery components, welding tapes are likely to cause whitening problems when they are covered by the gate lines, and fluxes are costly to be contaminated, which affects production quality.
Design the front and back main gate lines of the battery cell are arranged one by one, and a buckle is formed at the end. The battery cell is connected by buckle, eliminating welding tape, and using a stacker to buckle the battery cell in a predetermined manner. Combined arrangement.
The solderless tape connection battery cells are realized, which reduces production costs and improves the production efficiency and quality of battery components.
Smart Images
Figure CN114300547B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of photovoltaic component production, and relates to a battery sheet, a shingled component and a shingled machine. Background Art
[0002] In the field of battery assembly production, adjacent battery cells are usually welded together through welding ribbons to form connected battery strings. As the number of grid lines on the welding ribbons increases and the welding ribbons become thinner, problems such as whitening are easily caused when the welding ribbons cover the grid lines. In addition, the welding ribbons need to be coated with flux before connecting the battery cells, which results in high costs. The flux can easily contaminate the operating table and cause hidden cracks in the battery cells, which is a great obstacle to improving the production quality of battery assemblies. Summary of the invention
[0003] In order to solve the above technical problems, the present application provides a battery cell, a shingled assembly and a shingled machine. The technical solution is as follows:
[0004] In a first aspect, the present application provides a battery cell, wherein a predetermined number of parallel main grid lines are formed on the front and back of the battery cell, the front main grid lines and the back main grid lines of the battery cell are arranged one by one, and the first end of the front main grid line is vertically opposite to the first end of the back main grid line, and the second end of the front main grid line is vertically opposite to the second end of the back main grid line, a first buckling portion is formed at the first end of the front main grid line of the battery cell, and a second buckling portion is formed at the second end of the back main grid line of the battery cell, wherein:
[0005] The first buckling portion is a convex portion, and the second buckling portion is a concave portion; or, the first buckling portion is a concave portion, and the second buckling portion is a convex portion; or, both the first buckling portion and the second buckling portion are concave portions.
[0006] Optionally, the first buckling portion of the battery cell is in the shape of an elongated strip, and the first buckling portion in the shape of an elongated strip spans across the first end of each main grid line on the front side of the battery cell and is perpendicular to each main grid line;
[0007] The second buckling portion of the battery cell is in the shape of an elongated strip. The second buckling portion in the shape of an elongated strip spans across the second ends of the main grid lines on the back of the battery cell and is perpendicular to the main grid lines.
[0008] Optionally, at least one groove for increasing the light trapping rate is formed on the non-gate line area on the surface of the cell, and a pyramid structure produced by texturing is formed in the groove.
[0009] Optionally, there are at least two grooves on the battery sheet, and the at least two grooves include at least one of the following arrangements: side by side arrangement, spaced arrangement, cross arrangement or random arrangement.
[0010] Optionally, the surface of the battery cell includes a traceability area and a non-traceability area, a traceability code is formed in the traceability area, the traceability code is used to trace the battery cell, and the grooves are distributed in the non-traceability area.
[0011] Optionally, the groove of the battery cell is an arc-shaped concave surface, a conical concave surface, a trapezoidal concave surface, or an irregular concave surface.
[0012] Optionally, the diameter of the upper end of the groove of the battery cell ranges from 2 μm to 200 μm, and the depth of the groove ranges from 4 μm to 25 μm.
[0013] Optionally, the diameter of the upper end of the groove of the battery cell ranges from 90 μm to 130 μm. Optionally, the depth of the groove ranges from 4 μm to 11 μm.
[0014] Optionally, the cell is a monocrystalline cell or a polycrystalline cell.
[0015] In a second aspect, the present application further provides a battery shingle assembly, the battery shingle assembly comprising a predetermined number of battery cells as provided in the first aspect and various optional embodiments of the first aspect, the predetermined number of battery cells are arranged in sequence, the edge of the rear battery cell of two adjacent battery cells is stacked on the edge of the front battery cell, and the stacking position of the two adjacent battery cells is fixed by buckling;
[0016] The first buckling portion on the upper surface of the buckling edge of the front battery sheet is buckled with the second buckling portion on the lower surface of the buckling edge of the rear battery sheet.
[0017] In a third aspect, the present application further provides a shingling machine, the shingling machine comprising a cell feeding device and a component carrying device, wherein:
[0018] The battery cell feeding device picks up the battery cells, and arranges the battery cells on the component carrying device in a predetermined manner, thereby forming a battery shingled assembly as provided in the second aspect.
[0019] Based on the above technical features, this application can at least achieve the following beneficial effects:
[0020] By providing a buckle portion at the end of the main grid line of the battery cell, the battery cells are connected in series by buckling the buckle portion at the end of the battery cell, eliminating the welding strip, greatly saving costs, and improving the production efficiency of the battery assembly.
[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0023] Figure 1 is a front schematic diagram of a battery cell provided in one embodiment of the present application;
[0024] Figure 2A-2C is a side view schematic diagram of three battery cells provided in one embodiment of the present application;
[0025] Figure 3A is a front view schematic diagram of a battery cell with a groove provided in one embodiment of the present application;
[0026] Figure 3B is a schematic diagram of a pyramid structure formed in a groove provided in one embodiment of the present application;
[0027] Figure 3C It is a schematic diagram of grooves of different concave surfaces and pyramid structures in the concave surfaces provided in some embodiments of the present application;
[0028] Figure 3D It is a front view schematic diagram of a battery cell with some grooves arranged at intervals provided in one embodiment of the present application;
[0029] Figure 3E It is a front view schematic diagram of a battery sheet with some grooves arranged side by side provided in one embodiment of the present application;
[0030] Figure 3F It is a front schematic diagram of a battery cell with a traceability code provided in one embodiment of the present application;
[0031] Figure 3G It is a front schematic diagram of a battery cell with a groove and a traceability code provided in one embodiment of the present application;
[0032] Figure 4 is a front schematic diagram of a battery shingled assembly provided in one embodiment of the present application;
[0033] Figure 5A-5C They are Figure 2A-2C Side view of the battery cells being snapped into a string.
[0034] The reference numerals are as follows:
[0035] 10. Battery cell; 11. Front main grid line; 12. First buckle part; 13. Second buckle part; 14. Soldering part; 20. Groove; 30. Pyramid structure; 40. Traceability code. DETAILED DESCRIPTION
[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.
[0037] Figure 1 It is a front schematic diagram of a battery cell provided in an embodiment of the present application. A predetermined number of parallel main grid lines are formed on the front and back of the battery cell 10 provided in the present application. The front main grid lines 11 and the back main grid lines of the battery cell 10 are arranged one by one, and the first end of the front main grid line 11 is opposite to the first end of the back main grid line, and the second end of the front main grid line 11 is opposite to the second end of the back main grid line, a first buckling portion 12 is formed at the first end of the front main grid line 11 of the battery cell 10, and a second buckling portion is formed at the second end of the back main grid line of the battery cell 10.
[0038] The first buckling portion 12 and the second buckling portion are used to buckle two adjacent battery cells 10. Therefore, the present application provides at least the following three types of battery cells 10:
[0039] The first type of battery, see Figure 2A The first buckling portion 12 on the battery cell 10 is a convex portion, and the second buckling portion 13 on the battery cell 10 is a concave portion.
[0040] For the second type of battery, see Figure 2B The first buckling portion 12 on the battery cell 10 is a recessed portion, and the second buckling portion 13 on the battery cell 10 is a raised portion.
[0041] For the third type of battery, see Figure 2C The first buckling portion 12 and the second buckling portion 13 on the battery cell 10 are both recessed portions.
[0042] In a possible implementation, the first buckling portion 12 of the battery cell 10 may be in the shape of an elongated strip, and the elongated first buckling portion 12 spans across the first ends of the front main grid lines 11 of the battery cell 10 and is perpendicular to the front main grid lines 11 .
[0043] Similarly, the second buckling portion 13 of the battery cell 10 may also be in the shape of an elongated strip. The second buckling portion 13 in the shape of an elongated strip spans across the second end of each rear main grid line of the battery cell 10 and is perpendicular to each rear main grid line.
[0044] See also Figure 3A and Figure 3BAs shown, in order to further improve the photoelectric conversion efficiency of the cell 10, at least one groove 20 for increasing the light trapping rate is formed on the non-gate line area on the surface of the cell 10, and a pyramid structure 30 produced by texturing is formed in the groove 20.
[0045] The pyramid structure 30 in the groove 20 can reflect the light repeatedly in the groove 20 , thereby improving the light trapping rate.
[0046] In practical applications, in order to increase the light trapping rate after texturing in the groove 20, the concave surface of the groove 20 can be Figure 2B The arc-shaped concave surface shown in the figure, the concave surface of the groove 20 can also be a conical concave surface, a trapezoidal concave surface, or an irregular concave surface, etc. The trapezoidal concave groove 20 and the pyramid structure 30 formed inside are as shown in FIG. Figure 3C As shown in (1), the concave groove 20 and the pyramid structure 30 formed inside are as shown in Figure 3C As shown in (2), an irregular concave groove 20 and a pyramid structure 30 formed inside are as shown in Figure 3C As shown in (3) in .
[0047] In actual implementation, the size, shape, depth and other parameters of the groove 20 should be guided by the pyramid structure 30 that can be produced by texturing. Of course, the size, shape, depth and other parameters of the groove 20 can be verified by experiments to find a parameter configuration with a higher light trapping rate.
[0048] It should be noted that the groove 20 in the present application is used to increase the light trapping rate and usually does not need to be visually identified in the later stage. Therefore, during the process of forming the groove 20, the recognition accuracy of the groove 20 does not need to be considered.
[0049] In order to further improve the light trapping rate of the cell 10, the cell 10 in the present application may have at least two grooves 20. The at least two grooves 20 may be arranged in a variety of ways, usually including at least one of the following arrangements: side-by-side arrangement, interval arrangement, cross arrangement or random arrangement. Figure 3D The spacing arrangement in Figure 3E Side-by-side arrangement, or cross arrangement, etc.
[0050] The arrangement of the grooves 20 is usually determined based on factors such as the difficulty and efficiency of the process for forming the grooves 20. For example, when using a laser to form the grooves 20, factors such as the emission frequency of the laser, the moving speed of the laser, the switching on and off of the laser, and the moving speed of the silicon wafer need to be considered.
[0051] In the present application, the groove 20 of the battery cell 10 may be an arc-shaped concave surface, a conical concave surface, a trapezoidal concave surface, or an irregular concave surface, etc. Generally, the concave shapes of the groove 20 are different, and the pyramids generated in the same area may be different. Therefore, it can be determined according to actual test verification which concave groove 20 to use.
[0052] In order to improve the light trapping rate of the groove 20 , the diameter of the upper end of the groove 20 of the cell 10 may be in the range of 2 μm-200 μm, and the depth of the groove may be in the range of 4 μm-25 μm.
[0053] It has been verified through theory and experiment that when the diameter of the upper end of the groove 20 is in the range of 90 μm-130 μm and the depth of the groove 20 is in the range of 4 μm-11 μm, the light trapping rate of the pyramid structure in the groove 20 is more significant.
[0054] Optionally, the diameter of the upper end of the groove 20 of the battery cell 10 may be 95 μm, 100 μm, 105 μm, 108 μm, 110 μm, 113 μm, 120 μm, 125 μm, etc.
[0055] Optionally, the depth of the groove 20 of the battery cell 10 can be 4.5 μm, 5 μm, 5.6 μm, 6 μm, 6.7 μm, 7 μm, 8 μm, 8.5 μm, 9 μm, 10 μm, etc.
[0056] See also Figure 3F As shown, in order to meet the traceability requirements of the battery cell 10, the surface of the battery cell 10 provided in the present application may include a traceability area and a non-traceability area, a traceability code 40 is formed in the traceability area, the traceability code 40 is used to trace the battery cell 10, and the grooves 20 are distributed in the non-traceability area.
[0057] Generally, the traceability code 40 is a barcode, graphic code or text code composed of a plurality of pits. The text code may include a numeric code, an alphabetic code, a character code, etc. A plurality of pits may form different traceability codes 40 through different arrangements.
[0058] In some application scenarios, each battery cell 10 needs to be traced, and the traceability code 40 on the corresponding battery cell 10 is usually used to uniquely identify the battery cell 10. The traceability codes 40 on different battery cells 10 are also different. Commonly, a traceability code 40 is randomly generated for the battery cell 10 through a traceability code 40 generation algorithm.
[0059] In other application scenarios, the battery cells 10 from the same battery box are required. In this case, a same traceability code 40 can be formed for the battery cells 10 of the same battery box, that is, the traceability code 40 is used to uniquely identify the battery box.
[0060] For another example, it is necessary to trace the cells 10 from the same crystal rod. In this case, a same traceability code 40 can be formed for the cells 10 of the same crystal rod, that is, the traceability code 40 is used to uniquely identify the crystal rod.
[0061] In addition, the battery cell 10 may also have a groove 20 and a traceability code 40, see Figure 3G It should be noted that, since the groove 20 is suitable for increasing light trapping and the traceability code 40 is used to improve recognition accuracy, the parameters of the pits in the groove 20 and the traceability code 40 may be different.
[0062] The cell 10 provided in the present application may be a monocrystalline cell 10 or a polycrystalline cell 10. In addition, the cell 10 provided in the present application may be a standard cell 10, or may be a cell split formed by splitting a standard cell 10, such as a two-split, a three-split, a four-split, a five-split, a six-split, etc.
[0063] In summary, the battery cell 10 provided in the present application, by providing a snap-in portion at the end of the main grid line 11 of the battery cell 10, realizes the series connection of the battery cells 10 by snapping the snap-in portion at the end of the battery cell 10, thereby eliminating the welding strip, greatly saving costs, and improving the production efficiency of the battery assembly.
[0064] Figure 4 1 is a front view of a battery shingled assembly provided in one embodiment of the present application. The battery shingled assembly provided in the present application may include a predetermined number of battery cells 10. Here, the battery cells 10 are as follows: Figure 1 , Figure 2A-2C ,or Figure 3A-Figure 3F As shown in , I will not go into details here.
[0065] The predetermined number of battery cells 10 are arranged in sequence, and the edge of the rear battery cell 10 of two adjacent battery cells 10 is stacked on the edge of the front battery cell 10 , and the stacking position of the two adjacent battery cells 10 is fixed by buckling.
[0066] The first buckling portion 12 on the upper surface of the buckling edge of the front battery cell 10 is buckled with the second buckling portion 13 on the lower surface of the buckling edge of the rear battery cell 10 .
[0067] Depend on Figure 2A-2C The three types of battery cells 10 shown can be buckled into the following Figure 5A-5C The battery shingled assembly shown in .
[0068] It should be noted that for Figure 2CThe battery cell shown generally needs to be provided with a soldering portion 14 in each recessed portion to ensure that the soldering portion 14 is melted and filled into the recessed portion to buckle the two battery cells 10. The soldering portion 14 is generally made of a soldering material, such as flux.
[0069] This type of snap-on battery shingled assembly no longer requires the use of solder ribbons for connection, has a simple production method and relatively low production costs.
[0070] In summary, the battery shingled assembly provided in the present application, by providing a snap-in portion at the end of the main grid line of the battery cell, realizes the series connection of the battery cells by snapping the snap-in portion at the end of the battery cell, thereby eliminating the welding strip, greatly saving costs, and improving the production efficiency of the battery assembly.
[0071] The present application also provides a shingling machine, which includes a battery sheet feeding device and a component carrying device, wherein:
[0072] The battery cell feeding device picks up the battery cells and arranges the battery cells on the component carrying device in a predetermined manner to form a battery shingled component as provided in the second aspect.
[0073] It can be seen from the above description that, based on the battery cells provided in this application, the structure of the corresponding shingling machine for producing battery shingling assemblies is very simple and the production efficiency is very high, which greatly improves the production efficiency and saves production costs.
[0074] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention invented herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.
[0075] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims
1. A battery cell, characterized in that: A predetermined number of parallel main grid lines are formed on the front and back of the battery cell, the front main grid lines and the back main grid lines of the battery cell are arranged one by one, and the first end of the front main grid line is opposite to the first end of the back main grid line, and the second end of the front main grid line is opposite to the second end of the back main grid line, and a first buckling portion is formed at the first end of the front main grid line of the battery cell, and a second buckling portion is formed at the second end of the back main grid line of the battery cell, wherein: The first buckling portion is a convex portion, and the second buckling portion is a concave portion; or, the first buckling portion is a concave portion, and the second buckling portion is a convex portion; or, both the first buckling portion and the second buckling portion are concave portions.
2. The battery cell according to claim 1, characterized in that: The first buckling portion of the battery cell is in the shape of an elongated strip, and the first buckling portion in the shape of an elongated strip spans across the first end of each main grid line on the front side of the battery cell and is perpendicular to each main grid line; The second buckling portion of the battery cell is in the shape of an elongated strip. The second buckling portion in the shape of an elongated strip spans across the second ends of the main grid lines on the back of the battery cell and is perpendicular to the main grid lines.
3. The battery cell according to claim 1, characterized in that: At least one groove for increasing the light trapping rate is formed on the surface of the battery cell, and a pyramid structure produced by texturing is formed in the groove.
4. The battery cell according to claim 1, characterized in that: There are at least two grooves on the battery sheet, and the at least two grooves are arranged in at least one of the following ways: side by side, spaced, crossed or random.
5. The battery cell according to claim 3, characterized in that: The surface of the battery cell includes a traceability area and a non-traceability area. A traceability code is formed in the traceability area. The traceability code is used to trace the battery cell. The grooves are distributed in the non-traceability area.
6. The battery cell according to claim 3, characterized in that: The groove of the battery sheet is an arc-shaped concave surface, a conical concave surface, a trapezoidal concave surface, or an irregular concave surface.
7. The battery cell according to claim 3, characterized in that: The diameter of the upper end of the groove of the battery cell ranges from 2 μm to 200 μm, and the depth of the groove ranges from 4 μm to 25 μm.
8. The battery cell according to claim 1, characterized in that: The cell is a single crystal cell or a polycrystalline cell.
9. A battery shingled assembly, characterized in that: The battery shingle assembly comprises a predetermined number of battery cells as claimed in any one of claims 1 to 4 and 6 to 8, wherein the predetermined number of battery cells are arranged in sequence, and the edge of the rear battery cell of two adjacent battery cells is stacked on the edge of the front battery cell, and the stacking position of the two adjacent battery cells is fixed by buckling; The first buckling portion on the upper surface of the buckling edge of the front battery sheet is buckled with the second buckling portion on the lower surface of the buckling edge of the rear battery sheet.
10. A shingle stacking machine, characterized in that: The shingling machine comprises a cell feeding device and a component carrying device, wherein: The battery cell feeding device picks up the battery cells and arranges the battery cells on the component carrying device in a predetermined manner to form the battery shingled assembly as described in claim 9.