Battery piece structure

Abstract

The utility model relates to the field of photovoltaic cells, in particular to a cell piece structure which comprises a cell piece body provided with grid lines. The positioning pieces are located on the two sides of the grid line, and a containing space is formed between the positioning pieces located on the two sides of the grid line; at least part of the welding strip is located in the containing space, the welding strip is parallel to the grid line, the welding strip is connected with the grid line, and the welding strip abuts against the positioning piece. The technical problem of poor quality of the battery piece is solved, and the technical effect of improving the quality of the battery piece is achieved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cells, and in particular to a cell structure and a cell processing method. Background Art

[0002] BC cell is a high-efficiency photovoltaic cell, the full name is full back electrode contact (full reverse electrode contact) crystalline silicon photovoltaic cell. This type of cell uses N-type single crystal silicon wafer as the base material, and the surface is doped with phosphorus to form a PN junction, which has high conversion efficiency and stable performance. The structure of BC cell is relatively simple, and the manufacturing process is relatively easy, so the manufacturing cost is relatively low, which is suitable for a variety of application scenarios such as distributed photovoltaic power generation systems and centralized photovoltaic power stations. The positive and negative electrodes of BC cell are arranged on the back of the battery. Specifically, P and N regions arranged in a forked-finger shape are prepared on the back of the battery, so that there are both positive and negative electrodes on the back. This design allows all the grid lines to be completely welded to the back of the cell without blocking the surface of the cell, thereby improving the light absorption rate and photoelectric conversion efficiency.

[0003] In the prior art, the layout of the solder strips on the surface of the BC battery is arranged with the positive and negative electrodes spaced apart. During the production process of the battery cell, the solder strips need to be arranged on the surface of the battery cell. It is difficult to fix the solder strips when arranging them, causing the positions of the solder strips on the battery cell to shift or even be misplaced, resulting in contact between two adjacent solder strips, making it more likely that the solder strips will short-circuit, thereby reducing the quality of the battery cell. Similarly, the solder strips on other battery cells also have the same problem, and the solder strip layout causes the quality of the battery cell to be reduced.

[0004] Therefore, the technical problem of the prior art is that the quality of the battery cells is poor. Utility Model Content

[0005] The present application provides a battery cell structure and a battery cell processing method, which solves the technical problem of poor battery cell quality and achieves the technical effect of improving the quality of battery cells.

[0006] On the one hand, the present application provides a battery cell structure, which adopts the following technical solution:

[0007] A battery cell structure comprises: a battery cell body, the battery cell body having a grid line; a positioning member, the positioning member is located on both sides of the grid line, and a receiving space is formed between the positioning members on both sides of the grid line; and a welding strip, at least part of the welding strip is located in the receiving space, the welding strip is arranged parallel to the grid line, the welding strip is connected to the grid line, and the welding strip conflicts with the positioning member.

[0008] Preferably, the grid lines have a plurality of groups, and the positioning members are arranged on both sides of each grid line.

[0009] Preferably, the positioning member is in the shape of an elongated strip, and the length of the positioning member is the same as or substantially the same as the gate line.

[0010] Preferably, the positioning members are in the shape of short strips or blocks, and multiple groups of positioning members are arranged on both sides of the grid line, and the multiple groups of positioning members are arranged along the direction of the grid line.

[0011] Preferably, the positioning member is an insulating member.

[0012] Preferably, the welding ribbon is a round welding ribbon, a square welding ribbon, a flat welding ribbon or a special-shaped welding ribbon.

[0013] On the other hand, the present application also provides a battery cell processing method, which adopts the following technical solution:

[0014] A battery cell processing method comprises: providing a battery cell; grooving the battery cell and screen printing silver paste to form grid lines; arranging positioning pieces on both sides of the grid lines to form a containing space between the positioning pieces on both sides; laying out a welding strip along the grid lines so that at least part of the welding strip is located in the containing space, the welding strip is connected to the grid lines, and the welding strip abuts against the positioning pieces.

[0015] Preferably, the arranging the positioning members on both sides of the gate line comprises: screen printing colloid on both sides of the gate line and solidifying the colloid to form the positioning members.

[0016] Preferably, the positioning members are arranged on both sides of the gate line, including: providing long strip-shaped positioning members, so that the positioning members are arranged on both sides of the gate line, and the positioning members are fixedly connected to the battery cell, and the length of the positioning members is the same or substantially the same as the gate line; or providing short strip-shaped or block-shaped positioning members, so that the positioning members are arranged on both sides of the gate line, and multiple groups of positioning members are arranged on both sides of the gate line, and the multiple groups of positioning members are arranged along the direction of the gate line.

[0017] Preferably, the method of laying the welding tape along the gate line comprises: providing a carrier, the carrier having one or more operating surfaces, the operating surface being used to carry the battery cell; winding the welding tape on the battery cell along the gate line or the accommodating space so that at least part of the welding tape is located inside the accommodating space, the welding tape is in contact with the gate line, and the welding tape is in contact with the positioning piece; connecting the welding tape to the gate line; cutting the welding tape at the end of the gate line; and taking out the cell.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. This application sets a positioning piece for positioning the welding strip on the surface of the battery cell. The accommodation space formed by the positioning piece is used to accommodate the welding strip. When laying the welding strip, it can be aligned and pre-fixed along the accommodation space, so that the welding strip has a preset layout route, which is convenient for the arrangement of the welding strip, improves the laying accuracy of the welding strip, and prevents the welding strip on the surface of the battery cell from offsetting and causing a short circuit. The technical problem of poor quality of the battery cell is solved, and the technical effect of improving the quality of the battery cell is achieved.

[0020] 2. The present application provides positioning pieces on both sides of the grid line, which are adapted to welding strips of different shapes, thereby increasing the adaptability of the cell structure and meeting different process requirements.

[0021] 3. The positioning parts of the present application are arranged by colloid silk screen printing, which improves the efficiency of positioning part arrangement while ensuring the accuracy of the height and length of the positioning parts, so that the positioning parts and the accommodating space formed can match the welding strip, preventing poor contact between the grid line and the welding strip, and further improving the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the battery cell structure described in the present application (the welding strip is not shown);

[0023] Figure 2 is a side view of the battery cell structure described in the present application (the welding strip is not shown);

[0024] Figure 3 is a side view of the battery cell structure described in the present application (with welding strips shown);

[0025] Figure 4 is a schematic diagram of a first embodiment of the battery cell structure described in the present application;

[0026] Figure 5 yes Figure 4 A magnified view of middle;

[0027] Figure 6 is a schematic diagram of a second embodiment of the battery cell structure described in the present application;

[0028] Figure 7 yes Figure 6 Enlarged view of middle B;

[0029] Figure 8 It is a schematic diagram of the processing flow of the battery cell structure described in this application.

[0030] Explanation of reference numerals: 100, battery cell body; 110, grid line; 200, positioning member; 300, accommodating space; 400, welding strip. DETAILED DESCRIPTION

[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application 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 a limitation to this application.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] The embodiments of the present application provide a battery cell structure and a battery cell processing method, which solve the technical problem of poor battery cell quality and achieve the technical effect of improving the quality of battery cells.

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0035] The present application provides a cell structure, which is applied to photovoltaic cells, such as BC cells, OBB cells, dense grid cells, IBC cells, etc., to improve the processing quality of photovoltaic cells. Figure 1 As shown, the cell structure includes a cell body 100, a positioning member 200 and a welding strip 400. The cell body 100 is used as a power generation body; the positioning member 200 is used to position the welding strip 400; and the welding strip 400 is used to collect and conduct current.

[0036] The battery cell body 100, such as Figure 1 , 2As shown in Figures 3 and 4, the cell body 100 is used as a power generation body. The cell body 100 is in the form of a sheet. After being grooved and screen-printed with silver paste, a silver grid, i.e., a grid line 110, can be formed on the surface. The grid line 110 is used to connect with the welding strip 400. It is worth noting that due to the screen printing process, the grid line 110 is slightly raised relative to the cell surface. Generally, there are multiple grid lines 110 on the cell body 100. The multiple grid lines 110 are arranged in parallel, and the grid lines 110 can also be arranged parallel to each other.

[0037] Positioning member 200, such as Figure 2 , 3 As shown, the positioning member 200 is used to position the welding strip 400. The positioning member 200 is arranged on both sides of the grid line 110. Specifically, the positioning member 200 is arranged on both sides of the same grid line 110. In other words, positioning members 200 are arranged on both sides of each grid line 110, that is, one grid line 110 corresponds to two positioning members 200, so that an accommodation space 300 is formed between the positioning members 200 on both sides of the same grid line 110, and the accommodation space 300 is used to cooperate with the welding strip 400; wherein, the positioning member 200 is fixedly connected to the surface of the battery cell, so that the position of the positioning member 200 is fixed, which can play a role in positioning the welding strip 400 and prevent the welding strip 400 from being offset during the layout process.

[0038] The positioning member 200 is arranged on both sides of each gate line 110. The gate line 110 on each battery cell has a certain length requirement. Similarly, the positioning member 200 also has a certain length requirement, wherein the length or layout length of the positioning member 200 should be the same or basically the same as the length of the gate line 110; it can be understood that the same means that the length or layout length of the positioning member 200 is exactly the same as the length of the gate line 110, that is, the two ends are flush; and the basic same means that there is a certain difference between the length or layout length of the positioning member 200 and the length of the gate line 110, that is, the lengths of the two may have a certain allowable range, for example, the length or layout length of the positioning member 200 may be greater than or less than the length of the gate line 110. In one embodiment, the length or layout length of the positioning member 200 is greater than or less than 10% of the length of the gate line 110; in another embodiment, the length or layout length of the positioning member 200 is greater than or less than 10%-30% of the length of the gate line 110.

[0039] Further, the length and layout length of the positioning member 200 are described in detail. The present application takes the positioning members 200 on both sides of a grid line 110 as an example:

[0040] In one embodiment, Figure 4 , 5As shown, the positioning member 200 is in the shape of a long strip, and a positioning member 200 is disposed on each side of the gate line 110, that is, a groove is formed by two positioning members 200 on both sides of the gate line 110, and the gate line 110 is located inside the groove, and the groove is the accommodating space 300. It can be understood that since the positioning member 200 is in the shape of a long strip and is formed integrally, the length of the positioning member 200 is the actual length of the positioning member 200.

[0041] In another embodiment, Figure 6 , 7 As shown, the positioning member 200 is in the shape of a short strip or a block, and a plurality of positioning members 200 are respectively arranged on both sides of the gate line 110, and the plurality of positioning members 200 are arranged along the direction of the gate line 110, wherein an accommodation space 300 is formed between two positioning members 200 located on both sides of the gate line 110 and opposite to each other, and an accommodation space 300 is formed between every two opposite positioning members 200, and each accommodation space 300 is used to cooperate with the welding strip 400. It can be understood that, since there are a plurality of positioning members 200, the plurality of positioning members 200 are arranged to limit the welding strip 400 together, and the length formed by the arrangement of the plurality of positioning members 200 in the direction of the gate line 110 is the layout length of the positioning members 200. In other words, the layout length of the positioning members 200 is obtained by arranging the plurality of positioning members 200.

[0042] It is worth noting that, in order to improve the insulation between the welding strips 400 , an insulating material may be used as the positioning member 200 , such as insulating glue, plastic parts, etc.

[0043] Welding ribbon 400, such as Figure 3 As shown, the welding strip 400 is used to collect and conduct current. The welding strip 400 is arranged on the battery cell, and the welding strip 400 is arranged corresponding to the grid line 110, that is, the welding strip 400 is arranged in parallel with the grid line 110; specifically, at least part of the welding strip 400 is embedded in the accommodating space 300, and the welding strip 400 part located in the accommodating space 300 is in contact with and connected to the grid line 110 everywhere, and the welding strip 400 is in conflict with the positioning members 200 located on both sides of the grid line 110. In other words, the welding strip 400 is arranged on the grid line 110, and is simultaneously affected by the conflicting effect of the positioning members 200 on both sides of the grid line 110, so that the welding strip 400 is limited between the two positioning members 200. In this way, the positioning members 200 have a positioning effect on the welding strip 400, prevent the welding strip 400 from being offset, ensure that the welding strip 400 is in stable contact with the grid line 110, and will not be misaligned with the adjacent welding strip 400, which is also conducive to improving the winding accuracy and efficiency of the welding strip 400.

[0044] In one embodiment, the welding strip 400 is a circular welding strip 400; in another embodiment, the welding strip 400 is a square welding strip 400; in other embodiments, the welding strip 400 can also be a flat welding strip 400 or a special-shaped welding strip 400, such as a triangular welding strip 400.

[0045] The present application also provides a battery cell processing method, such as Figure 8 As shown, including:

[0046] S1: Provide a battery cell;

[0047] S2: The battery cell is used as a processing object, and a silver grid, i.e., a grid line 110, is formed on the battery cell after grooving and screen printing of silver paste;

[0048] S3: Arranging the positioning members 200 on both sides of the gate line 110 so as to form a receiving space 300 between the positioning members 200 on both sides;

[0049] S4: Arranging the welding strip 400 along the gate line 110 so that at least a portion of the welding strip 400 is located in the accommodating space 300 , the welding strip 400 is connected to the gate line 110 , and the welding strip 400 is in conflict with the positioning member 200 .

[0050] Specifically, the positioning member 200 can be formed by colloid screen printing: colloid is screen-printed on both sides of the gate line 110 to form a prototype of the positioning member 200 on both sides of the gate line 110, and the positioning member 200 is formed after heating or UV curing.

[0051] In one embodiment, a long strip-shaped positioning member 200 is formed by silk-screen printing, so that the positioning member 200 is arranged on both sides of the gate line 110, and the positioning member 200 is fixedly connected to the battery cell, and the length of the positioning member 200 is the same or substantially the same as the gate line 110; in another embodiment, a short strip-shaped or block-shaped positioning member 200 is formed by silk-screen printing, so that the positioning member 200 is arranged on both sides of the gate line 110, and multiple groups of positioning members 200 are arranged on both sides of the gate line 110, and the multiple groups of positioning members 200 are arranged along the direction of the gate line 110; it is worth noting that positioning members 200 of different lengths and shapes can be formed by silk-screening with a preset pattern.

[0052] Furthermore, the steps of laying out the welding ribbon 400 also include:

[0053] A carrier is provided, the carrier has one or more operating surfaces, the operating surface is used to carry battery cells, and the operating surface has an adsorption function. After the battery cells are placed on the operating surface, the operating surface firmly adsorbs the battery cells on the operating surface through negative pressure. Further, the carrier has multiple operating surfaces, and the carrier can rotate around an axis, and the operating surface is arranged on the rotating side of the carrier, so that the battery cells can be fixed on each operating surface of the carrier, and the welding ribbon 400 can be wound on multiple battery cells at the same time by rotation;

[0054] The welding tape 400 is wound on the battery cell along the grid line 110 or the accommodating space 300, so that at least part of the welding tape 400 is located inside the accommodating space 300, the welding tape 400 is in conflict with the grid line 110, and the welding tape 400 is in conflict with the positioning member 200; in other words, by rotating the carrier, the welding tape 400 is embedded into the accommodating space 300 along the grid line 110, so that the welding tape 400 is in contact with the grid line 110, and the welding tape 400 is limited by the positioning member 200, so that the welding tape 400 will not be offset or misaligned, thereby ensuring the winding accuracy of the welding tape 400;

[0055] The welding strip 400 is connected to the gate line 110 by infrared, thermal contact or other heating methods. The connection of the welding strip 400 refers to welding between the welding strip 400 and the gate line 110.

[0056] Cut the welding strip 400 at the end of the gate line 110 and take the sheet.

[0057] Working principle / steps:

[0058] A battery cell is provided; the battery cell is used as a processing object, and a silver grid, i.e., a grid line 110, is formed on the battery cell after grooving and screen printing of silver paste; positioning members 200 are arranged on both sides of the grid line 110, so that a receiving space 300 is formed between the positioning members 200 on both sides; a welding strip 400 is arranged along the grid line 110, so that at least a part of the welding strip 400 is located in the receiving space 300, the welding strip 400 is connected to the grid line 110, and the welding strip 400 conflicts with the positioning member 200.

[0059] Technical effects:

[0060] 1. The present application sets a positioning member 200 for positioning the welding strip 400 on the surface of the battery cell. The accommodation space 300 formed by the positioning member 200 is used to accommodate the welding strip 400. When laying the welding strip 400, it can be aligned and pre-fixed along the accommodation space 300, so that the welding strip 400 has a preset layout route, which is convenient for arranging the welding strip 400, improving the layout accuracy of the welding strip 400, and preventing the welding strip 400 on the surface of the battery cell from deviating and causing a short circuit. The technical problem of poor quality of the battery cell is solved, and the technical effect of improving the quality of the battery cell is achieved.

[0061] 2. In the present application, positioning members 200 are provided on both sides of the grid line 110 to adapt to welding strips 400 of different shapes, thereby improving the adaptability of the battery cell structure and meeting different process requirements.

[0062] The positioning member 200 of the present application is arranged by colloid silk screen printing, which improves the efficiency of the arrangement of the positioning member 200 while ensuring the accuracy of the height and length of the positioning member 200, so that the positioning member 200 and the formed accommodating space 300 can match the welding strip 400, preventing poor contact between the gate line 110 and the welding strip 400, and further improving the quality of the battery cell.

[0063] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A battery cell structure, characterized in that: include: A battery cell body (100), wherein the battery cell body (100) has a grid line (110); Positioning members (200), the positioning members (200) being located on both sides of the gate line (110), and an accommodation space (300) being formed between the positioning members (200) located on both sides of the gate line (110); and A welding strip (400), at least a portion of the welding strip (400) is located in the accommodating space (300), the welding strip (400) is connected to the gate line (110), and the welding strip (400) is in conflict with the positioning member (200); Wherein, the length or layout length of the positioning member (200) is the same or substantially the same as that of the gate line (110).

2. A battery cell structure according to claim 1, characterized in that: The gate lines (110) have a plurality of groups, and the positioning members (200) are arranged on both sides of each gate line (110).

3. A battery cell structure according to claim 1, characterized in that: The positioning piece (200) is in the shape of an elongated strip.

4. The battery cell structure according to claim 1, characterized in that: The positioning member (200) is in the shape of a short strip or a block. A plurality of groups of positioning members (200) are arranged on both sides of the grid line (110), and the plurality of groups of positioning members (200) are arranged along the direction of the grid line (110).

5. The battery cell structure according to claim 1, characterized in that: The positioning member (200) is an insulating member.

6. The battery cell structure according to claim 1, characterized in that: The welding strip (400) is a circular welding strip (400), a square welding strip (400), a flat welding strip (400) or a special-shaped welding strip (400).

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