Cells, printing screens and cell separation

Abstract

The present application provides a battery cell, a printed screen and a battery slice, the battery cell comprising: a first region, a second region, a third region and a fourth region arranged in sequence along a first direction, each region having a plurality of main grid connection lines extending along the first direction, each main grid connection line of each region being aligned with a main grid connection line of an adjacent region in the first direction, the area ratio between the first region, the second region, the third region and the fourth region being R1:R2:R3:R4, R1 being 1.8 to 2.2, R2 being 0.8 to 1.2, R3 being 0.8 to 1.2, and R4 being 1.8 to 2.2, the first end or the second end of each main grid connection line being connected to a harpoon structure. The battery cell of the present application can be divided into two battery slices or three battery slices according to demand, reducing the management cost and the number of printed screens in the production process. The printed screen of the present application can print the main grid connection lines and the harpoon structure located on both sides of the battery cell, reducing the number of screens.

Description

Technical Field

[0001] The present application mainly relates to the technical field of solar cell manufacturing, and specifically to a solar cell, a printing screen and a solar cell segment. Background Art

[0002] Solar energy is a clean and reliable energy source. Solar cells can convert solar energy into electrical energy. As a strategic emerging energy industry. The electrodes in solar cells collect the electrons generated inside the solar cells and transmit them to external electrical appliances. The electrodes of solar cells have a specific structure. Metal paste with a specific pattern shape is printed on the cell using a screen, and then the metal paste is processed into electrodes by sintering. After sintering, the cell is divided into cell slices of a certain size according to demand. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a battery cell, a printing screen and a battery slice, wherein the battery cell can reduce the management cost and the number of printing screens in the production process.

[0004] To solve the above technical problems, the present application provides a battery cell, comprising: a first region, a second region, a third region and a fourth region arranged in sequence along a first direction, each region having a plurality of main grid connection lines extending along the first direction, each main grid connection line of each region being aligned with a main grid connection line of an adjacent region in the first direction, an area ratio between the first region, the second region, the third region and the fourth region being R1:R2:R3:R4, wherein R1 is 1.8 to 2.2, R2 is 0.8 to 1.2, R3 is 0.8 to 1.2, and R4 is 1.8 to 2.2, the first end or the second end of each main grid connection line is connected to a harpoon structure, the first end is opposite to the second end in the second direction, wherein the first direction intersects with the second direction.

[0005] In an embodiment of the present application, each main grid connection line in each region is not connected to a main grid connection line in an adjacent region.

[0006] In one embodiment of the present application, the first end of each main grid connection line is connected to the harpoon structure, and the second end of each main grid connection line is not connected to the harpoon structure, or the first end of each main grid connection line is not connected to the harpoon structure, and the second end of each main grid connection line is connected to the harpoon structure.

[0007] In an embodiment of the present application, each region further has a plurality of columns of solder joints spaced apart along the second direction, each column of solder joints has a plurality of solder joints spaced apart along the first direction, and each column of solder joints is respectively connected to a corresponding main grid connection line.

[0008] In one embodiment of the present application, the number of welds in each column of welds in the first region and the number of welds in each column of welds in the fourth region are both greater than the number of welds in each column of welds in the second region and the number of welds in each column of welds in the third region.

[0009] In one embodiment of the present application, each of the regions further comprises a plurality of secondary grid lines spaced apart along the first direction, each of the secondary grid lines extending along the second direction, wherein at least one secondary grid line intersecting with the harpoon structure is of discontinuous design.

[0010] In an embodiment of the present application, each main gate connection line in each region is connected to a plurality of auxiliary gate lines in the respective region.

[0011] In an embodiment of the present application, it also includes: a first cutting line, a second cutting line and a third cutting line, the first cutting line is located between the first area and the second area, the second cutting line is located between the second area and the third area, and the third cutting line is located between the third area and the fourth area.

[0012] On the other hand, the present application further provides a printing screen, which is used for printing the electrode structure of the battery cell as described above.

[0013] On the other hand, the present application also proposes a battery slice, which is obtained by dividing along the dividing line between the second area and the third area in the battery slice as described above, or by dividing along the dividing line between the first area and the second area and the dividing line between the third area and the fourth area.

[0014] The cell in the present application can be divided into two cell slices or three cell slices according to the requirements, which reduces the management cost in the production process, and the printing screens used for printing two slices and three slices can be combined into one printing screen. In addition, the printing screen in the present application can be used to print the main grid connection line and the harpoon structure on one side of the cell, and can also be used to print the main grid connection line and the harpoon structure on the other side of the cell, which reduces the number of screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0016] Figure 1 is a schematic top view of a battery cell in one embodiment of the present application;

[0017] Figure 2is a schematic diagram of the connection between battery slices in an embodiment of the present application;

[0018] Figure 3 It is a schematic top view of a battery cell in the prior art;

[0019] Figure 4 It is a schematic top view of a battery cell in the prior art.

[0020] Reference numerals

[0021] Battery cell 100 Second end 132 Main grid connection line 230

[0022] First area 111 Harpoon structure 140 Harpoon structure 240

[0023] Second area 112 Third battery slice 151 First dividing line 250

[0024] Third region 113 Fourth battery slice 152 Battery slice 300

[0025] Fourth region 114 Fifth battery slice 153 First region 310

[0026] First cutting line 121 Welding strip 160 Second area 320

[0027] Second cutting line 122 Welding point 170 Third area 330

[0028] Third cutting line 123 Battery cell 200 First cutting line 340

[0029] Main grid connection line 130 First region 210 Second dividing line 350

[0030] First end 131 Second region 220 Main grid connection line 360 DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0032] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0037] Next, the battery cell, printing screen and battery slice of the present application are described through examples.

[0038] Figure 1 FIG. 1 is a schematic top view of a battery cell 100 according to an embodiment. Figure 1 As shown, in Figure 1In the embodiment of the invention, the battery cell 100 has a first region 111, a second region 112, a third region 113 and a fourth region 114 which are arranged adjacent to each other from top to bottom along the first direction D1. The first cutting line 121 is located between the first region 111 and the second region 112 in the first direction D1, and the first cutting line 121 extends from the leftmost end to the rightmost end of the battery cell 100 in the second direction D2; the second cutting line 122 is located between the second region 112 and the third region 113 in the first direction D1, and the second cutting line 122 extends from the leftmost end to the rightmost end of the battery cell 100 in the second direction D2; the third cutting line 123 is located between the third region 113 and the fourth region 114 in the first direction D1, and the third cutting line 123 extends from the leftmost end to the rightmost end of the battery cell 100 in the second direction D2. In the slicing process, the first cutting line 121 can be used as a cutting line between the first region 111 and the second region 112 , the second cutting line 122 can be used as a cutting line between the second region 112 and the third region 113 , and the third cutting line 123 can be used as a cutting line between the third region 113 and the fourth region 114 .

[0039] The first area 111, the second area 112, the third area 113 and the fourth area 114 all have a plurality of main grid connection lines 130. The first area 111 is taken as an example for specific description. The first area 111 has 16 main grid connection lines 130 arranged at intervals in the second direction D2, and each main grid connection line 130 extends along the first direction D1. The number of main grid connection lines 130 in the first area 111 is not limited to 16 and can be set according to demand. Similarly, the second area 112, the third area 113 and the fourth area 114 also have 16 main grid connection lines 130 arranged at intervals in the second direction D2, and each main grid connection line 130 extends along the first direction D1. The main grid connection line 130 can be used to connect to the welding strip to transmit the electric energy generated by the battery cell 100 to the outside.

[0040] Each main grid connection line 130 in the first area 111, the second area 112, the third area 113 and the fourth area 114 is aligned with a main grid connection line 130 in the adjacent area, and each main grid connection line 130 is not connected to the main grid connection line 130 in the adjacent area. This is explained by taking the first area 111 and the second area 112 as an example. The 16 main grid connection lines 130 in the first area 111 are respectively aligned with a main grid connection line 130 in the second area 112. In other words, the extension lines of the 16 main grid connection lines 130 in the first area 111 in the first direction D1 coincide with a main grid connection line in the second area 112. The relationship between the main grid connection lines in other areas and the main grid connection lines in the adjacent areas is the same as the above case, and will not be further explained. In the slicing process, the cell sheet 100 can be cut along one or more of the first cutting lines 121, the second cutting lines 122, and the third cutting lines 123 to obtain cell slices. The discontinuity between the main grid connection lines 130 located in different areas can avoid metal chipping during slicing. In some embodiments, the material of the main grid connection line 130 may include metallic silver.

[0041] The area ratio of the first region 111, the second region 112, the third region 113 and the fourth region 114 is R1:R2:R3:R4, R1 is any value in the range of 1.8-2.2, R2 is any value in the range of 0.8-1.2, R3 is any value in the range of 0.8-1.2, and R4 is any value in the range of 1.8-2.2. For example, the area ratio of the first region 111, the second region 112, the third region 113 and the fourth region 114 may be 2:1:1:2.

[0042] refer to Figure 1As shown, the battery cell 100 can be cut into two battery slices or three battery slices. Specifically, when the battery cell 100 needs to be cut into two battery slices, cutting the battery cell 100 along the second cutting line 122 can obtain two battery slices: a first battery slice and a second battery slice, the first battery slice corresponds to the first area 111 and the second area 112, and the second battery slice corresponds to the third area 113 and the fourth area 114. When the area ratio between the first area 111, the second area 112, the third area 113 and the fourth area 114 is 2:1:1:2, the area ratio between the first battery slice and the second battery slice is 1:1. When the battery cell 100 needs to be cut into three battery slices, three battery slices can be obtained by cutting the battery cell 100 along the first cutting line 121 and the third cutting line 123: the third battery slice, the fourth battery slice and the fifth battery slice, the third battery slice corresponds to the first area 111, the fourth battery slice corresponds to the second area 112 and the third area 113, and the fifth battery slice corresponds to the fourth area 114. When the area ratio between the first area 111, the second area 112, the third area 113 and the fourth area 114 is 2:1:1:2, the area ratio between the third battery slice, the fourth battery slice and the fifth battery slice is 1:1:1. It can be seen that the battery cell 100 in the present application can be divided into two battery slices or three battery slices according to needs. Compared with the two types of battery cells produced separately for being divided into two slices and three slices, the battery cell 100 in the above embodiment can reduce the management cost in the production process, and can also merge the two production lines originally used for producing two slices and three slices into one production line, reducing the cost of switching workshops, and can also merge the two printing screens used for printing two slices and three slices into one printing screen.

[0043] Continue to refer Figure 1As shown, each main grid connection line 130 in the first area 111, the second area 112, the third area 113 and the fourth area 114 has a first end 131 and a second end 132 that are opposite in the first direction D1. The main grid connection line 130 in the first area 111 is taken as an example for description. The first end 131 of each main grid connection line 130 in the first area 111 is connected to the harpoon structure 140, and the second end 132 of each main grid connection line 130 is not connected to the harpoon structure. Similarly, the first end of each main grid connection line 130 in the second area 112, the third area 113 and the fourth area 114 is connected to the harpoon structure 140, and the second end 132 of each main grid connection line 130 is not connected to the harpoon structure. In some other embodiments, the second end 132 of each busbar connection line 130 in the first area 111 is connected to the harpoon structure, and the first end 131 of each busbar connection line 130 is not connected to the harpoon structure, and the second end of each busbar connection line 130 in the second area 112, the third area 113, and the fourth area 114 is connected to the harpoon structure, and the first end 131 of each busbar connection line 130 is not connected to the harpoon structure. In general, one end of the first end 131 and the second end 132 of each busbar connection line 130 in the first area 111, the second area 112, the third area 113, and the fourth area 114 is connected to the harpoon structure, and the other end is not connected to the harpoon structure, and each busbar connection line in different areas is connected to the harpoon structure at the same end. In other words, the connection conditions between each main grid connection line and the harpoon structure in different regions are one of the following two: the first end of each main grid connection line in different regions is connected to the harpoon structure, and the second end 132 is not connected to the harpoon structure; or the second end 132 of each main grid connection line in different regions is connected to the harpoon structure, and the first end 131 is not connected to the harpoon structure.

[0044] Figure 2 is a schematic diagram of the connection between battery slices in an embodiment, Figure 2 The oval in the figure shows the location of the harpoon structure. Figure 1 and Figure 2 As shown, the cell 100 is cut into three cell slices along the first cutting line 121 and the third cutting line 123: the third cell slice 151, the fourth cell slice 152 and the fifth cell slice 153. The third cell slice 151, the fourth cell slice 152 and the fifth cell slice 153 are serially welded using the welding ribbon 160. Thanks to the same end (i.e., the first end or the second end) of each main grid connection line 130 in different regions being connected to the harpoon structure, Figure 1After the cell 100 is divided into three cell slices, there is no need to rotate the cell slices 180°, and the third cell slice 151, the fourth cell slice 152 and the fifth cell slice 153 can be directly welded in series using the welding ribbon 160. In this way, the fragments caused by rotating the cell slices can be avoided, while improving the utilization rate and production capacity of the workshop space. Similarly, when the cell 100 is divided into two cell slices along the second dividing line 122, there is no need to rotate the cell slices 180°, and the two cell slices can be directly welded in series using the welding ribbon 160.

[0045] In order to more clearly understand the above technical effects, the above technical effects are explained below in combination with battery cells in the prior art.

[0046] Figure 3 2 is a schematic top view of a battery cell 200 in the prior art. Figure 3 As shown, the battery cell 200 can be divided into two areas: a first area 210 and a second area 220. Both ends of each main grid connection line 230 in the first area 210 and the second area 220 are connected to the harpoon structure 240, and the battery cell 200 can be divided into two battery slices along the first dividing line 250 (corresponding to the first area 210 and the second area 220, respectively). Figure 3 There are differences in the harpoon structures connected to both ends of each main grid connection line 230 (for example, the size of the harpoon structure used for connecting with the welding strip is larger). Therefore, after the battery cell 200 is divided into battery slices, one of the battery slices needs to be rotated 180° to ensure that the orientation of the harpoon structure used for connecting with the welding strip is correct. Rotating the battery slice may cause the battery slice to break. The present application does not require the battery slice to be rotated, so the battery slice in the present application has a reduced fragmentation rate.

[0047] refer to Figure 4 The schematic top view of the battery cell 300 in the prior art is shown in FIG. Figure 4 and Figure 3 The main difference is that the battery cell 300 can be divided into three regions: a first region 310, a second region 320 and a third region 330, and the battery cell 300 can be cut into three battery slices along a first cutting line 340 and a second cutting line 350 (corresponding to the first region 310, the second region 320 and the third region 330, respectively). Figure 4 There are differences in the harpoon structures connected to both ends of each main grid connection line 360 ​​(for example, the size of the harpoon structure used for connecting with the welding strip is larger). Therefore, after the battery cell 300 is divided into battery slices, the battery slices need to be rotated 180° to ensure that the orientation of the harpoon structure used for connecting with the welding strip is correct. Rotating the battery slices may cause the battery slices to break. The present application does not need to rotate the battery slices, so the battery slices in the present application have a reduced fragmentation rate.

[0048] In addition, reference Figure 1 As shown, Figure 3 and Figure 4 Compared with the battery cell in, thanks to the fact that one end of the main grid connection line 130 is connected to the harpoon structure and the other end is not connected to the harpoon structure, the battery cell of the present application can save the paste (such as silver paste) used to print the harpoon structure.

[0049] refer to Figure 1 As shown, in one embodiment, the front and back sides of each region further have 16 columns of solder joints arranged at intervals along the second direction D2, each column of solder joints has a plurality of solder joints 170 arranged at intervals along the first direction D1, and each column of solder joints is respectively connected to a corresponding main grid connection line 130. The number of columns of solder joints is not limited to Figure 1 The number of solder joints 170 in each column is not limited to Figure 1 As shown, all can be set according to demand.

[0050] In some embodiments, the number of solder joints 170 in each column of solder joints in the first region 111 is greater than the number of solder joints 170 in each column of solder joints in the second region 112 and the number of solder joints in each column of solder joints in the third region 113. The number of solder joints 170 in each column of solder joints in the fourth region 114 is greater than the number of solder joints in each column of solder joints in the second region 112 and the number of solder joints 170 in each column of solder joints in the third region 113. This is mainly because the area of ​​the first region 111 is greater than the area of ​​the second region 112 and the area of ​​the third region 113, and the area of ​​the fourth region 114 is greater than the area of ​​the second region 112 and the area of ​​the third region 113.

[0051] In one embodiment, the first area 111, the second area 112, the third area 113 and the fourth area 114 also include a plurality of auxiliary grid lines (not shown) arranged at intervals along the first direction D1, each auxiliary grid line extends along the second direction D2, wherein at least one auxiliary grid line intersecting with the harpoon structure is of discontinuous design. In the process step of using the welding ribbon to string the battery slices, the auxiliary grid line of discontinuous design can reduce the distance between the welding ribbon and the surface of the battery slice, thereby avoiding the occurrence of hidden cracks at the edge of the battery slice. Each main grid connection line in the first area 111, the second area 112, the third area 113 and the fourth area 114 is connected to a plurality of auxiliary grid lines in the respective areas. Preferably, the extension direction of each main grid connection line is perpendicular to the extension direction of each auxiliary grid line, and in some other embodiments, the extension directions of the two can also be intersecting but not perpendicular. The auxiliary grid line can be used to collect the current generated in the battery slice, and the main grid connection line can be used to collect the current collected by the auxiliary grid line.

[0052] The soldering point has the function of welding with the soldering strip. When the battery is interconnected, the soldering strip is welded to the soldering point, and the electrons derived from the auxiliary grid line can be introduced into the soldering strip through the soldering point. The main grid connection line has the function of preventing the grid from breaking. When the soldering strip and the centipede leg are not effectively welded, the electrons are introduced into the nearest centipede leg that forms an effective weld through the main grid connection line, and then the electrons are derived. Figure 1 As shown, the harpoon structure 140 can connect the secondary grid lines outside the top solder joints in each region to the solder joints, so that the electrons are led out through the harpoon structure 140 .

[0053] The present application also proposes a printing screen. The printing screen can be used to print the electrode structure of the battery cell described above. The main grid connection line, auxiliary grid line, welding point and harpoon structure in the above embodiment can be collectively referred to as the electrode structure of the battery cell. It should be understood that the electrode structure can omit some structures on the basis of the main grid connection line, auxiliary grid line, welding point and harpoon structure, such as omitting welding points, and can also add some structures, such as adding centipede feet.

[0054] exist Figure 1 In the figure, only the main grid connection lines, welding points and harpoon structures on one side of the battery cell are illustrated, and the same main grid connection lines, welding points and harpoon structures can also be provided on the other side of the battery cell. In this way, the screen used for printing the main grid connection lines and harpoon structures on one side of the battery cell can also be used to print the main grid connection lines and harpoon structures on the other side of the battery cell, which reduces the number of printed screens. For example, since the main grid connection lines and harpoon structures on both sides of the battery cell are different from each other in the prior art, two sets of printed screens are required to print the main grid connection lines and harpoon structures on both sides of the battery cell. In comparison, the present application only needs one set of printed screens to print the main grid connection lines and harpoon structures on both sides of the battery cell.

[0055] The present application also provides a battery slice, which is obtained by cutting along a cutting line between the second region and the third region in the battery slice described above, or by cutting along a cutting line between the first region and the second region and a cutting line between the third region and the fourth region.

[0056] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0057] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0058] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0059] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0060] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A battery cell, characterized in that: include: A first area, a second area, a third area and a fourth area are arranged in sequence along a first direction, each area has a plurality of main grid connection lines extending along the first direction, each main grid connection line of each area is aligned with a main grid connection line of an adjacent area in the first direction, the area ratio between the first area, the second area, the third area and the fourth area is R1:R2:R3:R4, R1 is 1.8~2.2, R2 is 0.8~1.2, R3 is 0.8~1.2, and R4 is 1.8~2.2, the first end of each main grid connection line is connected to a harpoon structure, and the second end of each main grid connection line is not connected to the harpoon structure, or the first end of each main grid connection line is not connected to the harpoon structure, and the second end of each main grid connection line is connected to the harpoon structure, the first end and the second end are opposite in the second direction, wherein the first direction intersects with the second direction.

2. The battery cell according to claim 1, characterized in that: Each main grid connection line in each region is not connected to the main grid connection line in an adjacent region.

3. The battery cell according to claim 1, characterized in that: Each region further comprises a plurality of columns of welding points arranged at intervals along the second direction, each column of welding points comprises a plurality of welding points arranged at intervals along the first direction, and each column of welding points is respectively connected to a corresponding main grid connection line.

4. The battery cell according to claim 3, characterized in that: The number of solder joints in each column of solder joints in the first region and the number of solder joints in each column of solder joints in the fourth region are both greater than the number of solder joints in each column of solder joints in the second region and the number of solder joints in each column of solder joints in the third region.

5. The battery cell according to claim 1, characterized in that: Each of the regions further comprises a plurality of secondary grid lines arranged at intervals along the first direction, each of the secondary grid lines extending along the second direction, wherein at least one secondary grid line intersecting with the harpoon structure is of discontinuous design.

6. The battery cell according to claim 5, characterized in that: Each main grid connection line in each area is connected to a plurality of auxiliary grid lines in the respective area.

7. The battery cell according to claim 1, characterized in that Also includes: A first cutting line, a second cutting line and a third cutting line, wherein the first cutting line is located between the first area and the second area, the second cutting line is located between the second area and the third area, and the third cutting line is located between the third area and the fourth area.

8. A printing screen, characterized in that: The printing screen is used for printing the electrode structure of the battery cell according to any one of claims 1 to 7.

9. A battery slice, characterized in that: The battery slice is obtained by cutting along a cutting line between the second area and the third area in the battery slice as claimed in any one of claims 1 to 7, or by cutting along a cutting line between the first area and the second area and a cutting line between the third area and the fourth area.

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