Battery assembly, battery string and photovoltaic assembly of back contact battery

Abstract

The utility model discloses a battery assembly, a battery string and a photovoltaic assembly of a back contact battery. The battery assembly comprises a battery piece, a plurality of interconnection structural members and a plurality of glue points. The battery piece comprises a battery piece body and a plurality of fine grid lines, the plurality of interconnection structural members comprise a plurality of first interconnection structural members and a plurality of second interconnection structural members, the plurality of first interconnection structural members are electrically connected with the plurality of positive fine grid lines, and the plurality of second interconnection structural members are electrically connected with the plurality of negative fine grid lines; the plurality of glue points comprise a plurality of first glue points and a plurality of second glue points. Therefore, the part of the interconnection structural member is welded with the part of the grid line segment, the welding area of the interconnection structural member and the fine grid line is reduced, and the battery piece is prevented from being shrunk and warped due to heat. The arrangement of the first glue points and the second glue points is favorable for reducing the glue consumption on the premise of ensuring the connection reliability of the interconnected structural member, reducing the production cost, simplifying the production process and improving the reliability of the battery assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a battery component, a battery string and a photovoltaic component of a back-contact battery. Background Art

[0002] In the prior art, there is a main grid back contact battery assembly design, which consumes a lot of silver and has high production costs. After the battery cell assembly is welded using a conventional welding process during the production process, the battery cell and the adhesive film are heated and warped, resulting in a high risk of battery cell cracking and merging during lamination, which is not conducive to improving the finished product qualification rate and practical life of the battery assembly. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery assembly that can reduce production costs and improve the reliability of the battery assembly.

[0004] The second objective of the present invention is to provide a battery string, comprising the battery assembly described in the above embodiment.

[0005] The third objective of the present invention is to provide a photovoltaic module with back-contact cells, comprising the cell string described in the above embodiment.

[0006] A battery assembly according to an embodiment of the first aspect of the utility model comprises: a battery sheet, a plurality of interconnected structural members and a plurality of glue points;

[0007] The battery cell includes a battery cell body and a plurality of fine grid lines, the plurality of fine grid lines include a plurality of positive fine grid lines and a plurality of negative fine grid lines, the plurality of positive fine grid lines and the plurality of negative fine grid lines are alternately arranged on the battery cell body along a first direction, each of the fine grid lines includes a plurality of grid line segments, the plurality of grid line segments are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction.

[0008] The plurality of interconnection structures include a plurality of first interconnection structures and a plurality of second interconnection structures. The plurality of first interconnection structures and the plurality of second interconnection structures are alternately arranged along the second direction. The plurality of first interconnection structures and the plurality of second interconnection structures extend along the first direction. The plurality of first interconnection structures are electrically connected to the plurality of positive electrode fine grid lines, and the plurality of second interconnection structures are electrically connected to the plurality of negative electrode fine grid lines.

[0009] The multiple glue spots include multiple first glue spots and multiple second glue spots, the first glue spots are arranged between the first interconnecting structure and the battery cell body, the first glue spots are located between two adjacent grid line segments of the negative electrode fine grid line, the second glue spots are arranged between the second interconnecting structure and the battery cell body, and the second glue spots are located between two adjacent grid line segments of the positive electrode fine grid line.

[0010] According to the battery assembly of the embodiment of the utility model, the first interconnection structure is suitable for being electrically connected to the positive electrode fine grid line, the second interconnection structure is suitable for being electrically connected to the positive electrode fine grid line, and a portion of the interconnection structure is welded to a portion of the grid line segment of the fine grid, which is conducive to reducing the welding area between the interconnection structure and the fine grid line, and reducing the welding area is conducive to preventing the battery cell from shrinking and warping due to heat. The first interconnection structure and the second interconnection structure are fixedly connected to the battery cell body through the first glue point and the second glue point respectively. The setting of the first glue point and the second glue point is conducive to reducing the amount of glue used under the premise of ensuring the connection reliability of the first interconnection structure and the second interconnection structure, reducing the production cost of the battery assembly, simplifying the production process of the battery assembly, and improving the reliability of the battery assembly.

[0011] In some embodiments, the first glue dots are spaced apart from the adjacent positive electrode fine grid lines; and the second glue dots are spaced apart from the adjacent negative electrode fine grid lines.

[0012] In some embodiments, the glue dots are insulating glue.

[0013] In some embodiments, the width of the first glue dot in the first direction is greater than the width of the negative electrode fine grid line in the first direction, and the length of the first glue dot in the second direction is greater than the width of the first interconnection structure in the second direction; the width of the second glue dot in the first direction is greater than the width of the positive electrode fine grid line in the first direction, and the length of the second glue dot in the second direction is greater than the width of the second interconnection structure in the second direction.

[0014] In some embodiments, a first avoidance zone is defined between two adjacent gate line segments of the negative fine gate line, and the first glue point is located in the first avoidance zone; a second avoidance zone is defined between two adjacent gate line segments of the positive fine gate line, and the second glue point is located in the second avoidance zone; the gate line segment of the positive fine gate line includes a positive electrical connection portion, and the positive electrical connection portion is opposite to the first avoidance zone along the first direction; the gate line segment of the negative fine gate line includes a negative electrical connection portion, and the negative electrical connection portion is opposite to the second avoidance zone along the first direction.

[0015] In some embodiments, the maximum width of the positive electrical connection portion along the first direction is greater than or equal to the width of the remaining portion of the gate line segment of the positive fine gate line excluding the positive electrical connection portion along the first direction; the maximum width of the negative electrical connection portion along the first direction is greater than or equal to the width of the remaining portion of the gate line segment of the negative fine gate line excluding the positive electrical connection portion along the first direction.

[0016] In some embodiments, the length of the positive electrode electrical connection portion in the second direction is L 1 The width of the positive electrode electrical connection portion in the first direction is W 1 , the L 1 , W 1 Satisfy: 0≤L 1 ≤1.5mm, 30μm≤W 1 ≤80μm; the length of the negative electrode electrical connection portion in the second direction is L 2 The width of the negative electrode electrical connection portion in the first direction is W 2 , the L 2 , W 2 Satisfy: 0≤L 2 ≤1.5mm, width 30μm≤W 2 ≤80μm.

[0017] In some embodiments, the interconnection structure is a circular welding strip, and the diameter of the interconnection structure is d, wherein d satisfies: 0.15 mm≤d≤0.35 mm.

[0018] The battery string according to the embodiment of the second aspect of the utility model comprises the battery assembly according to the embodiment of the first aspect of the utility model.

[0019] A photovoltaic assembly of back-contact cells according to an embodiment of the third aspect of the utility model comprises a cell string according to an embodiment of the second aspect of the utility model.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 Schematic diagram of a battery string according to an embodiment of the present utility model.

[0023] Figure 2 It is a schematic diagram of a battery cell according to an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of a battery cell and glue points according to an embodiment of the utility model.

[0025] Reference numerals:

[0026] 100. Battery string;

[0027] 10. Battery components;

[0028] 11. Cell; 111. Cell body; 112. Fine grid line; 113. Positive fine grid line; 114. Second avoidance area; 115. Positive electrical connection part; 116. Negative fine grid line; 117. First avoidance area; 118. Negative electrical connection part; 119. Grid line segment;

[0029] 12. Interconnection structure; 121. First interconnection structure; 122. Second interconnection structure;

[0030] 13. Glue point; 131. First glue point; 132. Second glue point;

[0031] A. First direction; B. Second direction. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 3 The battery assembly 10 according to the embodiment of the present invention is described, comprising: a battery cell 11, a plurality of interconnected structural members 12 and a plurality of glue points 13. The battery cell 11 includes a first direction A and a second direction B.

[0033] Specifically, if Figure 1-Figure 3 As shown, the battery cell 11 includes a battery cell body 111 and a plurality of fine grid lines 112, the plurality of fine grid lines 112 include a plurality of positive fine grid lines 113 and a plurality of negative fine grid lines 116, the plurality of positive fine grid lines 113 and the plurality of negative fine grid lines 116 are alternately arranged on the battery cell body 111 along a first direction A, each fine grid line 112 includes a plurality of grid line segments 119, the plurality of grid line segments 119 are arranged at intervals along a second direction B, and the first direction A and the second direction B are perpendicular.

[0034] A plurality of fine grid lines 112 are arranged on at least one side of the cell body 111 along the thickness direction of the cell body 111, and the fine grid lines 112 extend along the second direction B. A plurality of positive fine grid lines 113 and a plurality of negative fine grid lines 116 are arranged in parallel and alternately along the first direction A. The positive fine grid lines 113 include a plurality of grid line segments 119 arranged at intervals along the second direction B, and the negative fine grid lines 116 include a plurality of grid line segments 119 arranged at intervals along the second direction B, and there is a certain interval between adjacent grid line segments 119.

[0035] The multiple interconnection structures 12 include multiple first interconnection structures 121 and multiple second interconnection structures 122. The multiple first interconnection structures 121 and the multiple second interconnection structures 122 are alternately arranged along the second direction B. The multiple first interconnection structures 121 and the multiple second interconnection structures 122 both extend along the first direction A. The multiple first interconnection structures 121 are electrically connected to the multiple positive electrode fine grid lines 113, and the multiple second interconnection structures 122 are electrically connected to the multiple negative electrode fine grid lines 116.

[0036] The plurality of first interconnecting structures 121 and the plurality of second interconnecting structures 122 are perpendicular to the plurality of fine grid lines 112, and the plurality of first interconnecting structures 121 and the plurality of second interconnecting structures 122 are arranged on the side of the plurality of fine grid lines 112 away from the battery cell body 111 along the thickness direction of the battery cell body 111. The first interconnecting structures 121 are respectively electrically connected to the grid line segments 119 of the plurality of positive fine grid lines 113, and the second interconnecting structures 122 are respectively electrically connected to the grid line segments 119 of the plurality of negative fine grid lines 116. The plurality of first interconnecting structures 121 and the plurality of second interconnecting structures 122 are arranged alternately in parallel along the second direction B. The first interconnecting structures 121 and the positive fine grid lines 113, and the second interconnecting structures 122 and the negative fine grid lines 116 are connected in the direction of welding.

[0037] The plurality of glue dots 13 include a plurality of first glue dots 131 and a plurality of second glue dots 132. The first glue dots 131 are disposed between the first interconnecting structural component 121 and the battery cell body 111. The first glue dots 131 are located between two adjacent grid line segments 119 of the negative electrode fine grid line 116. The second glue dots 132 are disposed between the second interconnecting structural component 122 and the battery cell body 111. The second glue dots 132 are located between two adjacent grid line segments 119 of the positive electrode fine grid line 113.

[0038] The negative electrode fine grid line 116 includes a plurality of grid line segments 119, wherein there is a certain interval between two adjacent grid line segments 119, and the first glue point 131 is arranged at the interval position of the negative electrode fine grid line 116. Along the thickness direction of the battery cell body 111, the first glue point 131 is arranged on the side of the battery cell body 111 where the fine grid line 112 is arranged, and is located between the first interconnection structure 121 and the battery cell body 111. The positive electrode fine grid line 113 includes a plurality of grid line segments 119, wherein there is a certain interval between two adjacent grid line segments 119, and the second glue point 132 is arranged at the interval position of the positive electrode fine grid line 113. Along the thickness direction of the battery cell body 111, the second glue point 132 is arranged on the side of the battery cell body 111 where the fine grid line 112 is arranged, and is located between the second interconnection structure and the battery cell body 111.

[0039] According to the battery assembly 10 of the embodiment of the utility model, the first interconnecting structural member 121 is suitable for being electrically connected to the positive electrode fine grid line 113, and the second interconnecting structural member 122 is suitable for being electrically connected to the positive electrode fine grid line 113. Part of the interconnecting structural member 12 is welded to part of the grid line segment 119 of the fine grid, which is conducive to reducing the welding area between the interconnecting structural member 12 and the fine grid line 112. Reducing the welding area is conducive to preventing the battery cell 11 from shrinking and warping due to heat. The first interconnecting structural member 121 and the second interconnecting structural member 122 are fixedly connected to the battery cell body 111 through the first glue point 131 and the second glue point 132 respectively. The setting of the first glue point 131 and the second glue point 132 is conducive to reducing the amount of glue used while ensuring the reliability of the connection between the first interconnecting structural member 121 and the second interconnecting structural member 122, reducing the production cost of the battery assembly 10, simplifying the production process of the battery assembly 10, and improving the reliability of the battery assembly 10.

[0040] According to some embodiments of the present invention, Figure 1 and Figure 3 As shown, the first glue dots 131 are spaced apart from the adjacent positive electrode fine grid lines 113 ; and the second glue dots 132 are spaced apart from the adjacent negative electrode fine grid lines 116 .

[0041] Along the first direction A, there is a certain interval between the positive electrode fine grid lines 113 and the negative electrode fine grid lines 116, and the plurality of first glue dots 131 and the negative electrode fine grid lines 116 are located on the same straight line, and there is a certain interval between the first glue dots 131 and the positive electrode fine grid lines 113. The plurality of first glue dots 131 and the positive electrode fine grid lines 113 are arranged alternately and spaced apart. Similarly, the plurality of second glue dots 132 and the positive electrode fine grid lines 113 are located on the same straight line, and there is a certain interval between the second glue dots 132 and the negative electrode fine grid lines 116, and the plurality of second glue dots 132 and the negative electrode fine grid lines 116 are arranged alternately and spaced apart.

[0042] Thus, the first glue dots 131 are used to strengthen the connection strength between the first interconnection structure 121 and the cell body 111, and the first glue dots 131 are spaced apart from the adjacent positive electrode fine grid lines 113 to prevent the first glue dots 131 from affecting the electrical connection effect between the first interconnection structure 121 and the positive electrode fine grid lines 113. The second glue dots 132 are used to strengthen the connection strength between the second interconnection structure 122 and the cell body 111, and the second glue dots 132 are spaced apart from the adjacent negative electrode fine grid lines 116 to prevent the second glue dots 132 from affecting the electrical connection effect between the second interconnection structure 122 and the negative electrode fine grid lines 116.

[0043] According to some embodiments of the utility model, the glue point 13 is an insulating glue. The insulating glue is characterized by good conformability and integrity, rapid solidification, good integrity, small shrinkage, no deformation, high dielectric properties and moisture-proof and thermal conductivity. Therefore, the first glue point 131 is an insulating glue and the first glue point 131 is arranged between two adjacent grid line segments 119 of the negative electrode fine grid line 116 to facilitate the insulation between the first interconnection structure 121 and the negative electrode fine grid line 116, to prevent the first interconnection structure 121 from being electrically connected to the negative electrode fine grid line 116 and causing the battery cell 11 to short-circuit, and the second glue point 132 is an insulating glue and the second glue point 132 is arranged between two adjacent grid line segments 119 of the positive electrode fine grid line 113 to facilitate the insulation between the second interconnection structure 122 and the positive electrode fine grid line 113, to prevent the second interconnection structure 122 from being electrically connected to the positive electrode fine grid line 113 and causing the battery cell 11 to short-circuit, thereby ensuring the current transmission performance and production yield of the battery cell 11.

[0044] According to some embodiments of the present invention, Figure 3 As shown, the width of the first glue dot 131 in the first direction A is greater than the width of the negative electrode fine grid line 116 in the first direction A, and the length of the first glue dot 131 in the second direction B is greater than the width of the first interconnection structure 121 in the second direction B; the width of the second glue dot 132 in the first direction A is greater than the width of the positive electrode fine grid line 113 in the first direction A, and the length of the second glue dot 132 in the second direction B is greater than the width of the second interconnection structure 122 in the second direction B.

[0045] Therefore, the area of ​​the first glue point 131 is large, so as to increase the bonding area between the first interconnection structure 121 and the battery cell body 111, so that the connection between the first interconnection structure 121 and the battery cell body 111 is more firm and reliable. The area of ​​the second glue point 132 is large, so as to increase the bonding area between the second interconnection structure 122 and the battery cell body 111, so that the connection between the second interconnection structure 122 and the battery cell body 111 is more firm and reliable, thereby improving the overall structural strength of the battery cell 11 and extending the service life of the battery cell 11.

[0046] According to some embodiments of the present invention, Figure 2 As shown, a first avoidance area 117 is defined between two adjacent gate line segments 119 of the negative fine gate line 116, and a first glue dot 131 is located in the first avoidance area 117; a second avoidance area 114 is defined between two adjacent gate line segments 119 of the positive fine gate line 113, and a second glue dot 132 is located in the second avoidance area 114; the gate line segment 119 of the positive fine gate line 113 includes a positive electrical connection portion 115, and the positive electrical connection portion 115 is opposite to the first avoidance area 117 along a first direction A; the gate line segment 119 of the negative fine gate line 116 includes a negative electrical connection portion 118, and the negative electrical connection portion 118 is opposite to the second avoidance area 114 along the first direction A.

[0047] The interval between two adjacent grid line segments 119 of the negative electrode fine grid line 116 is the first avoidance area 117, and the plurality of grid line segments 119 define a plurality of first avoidance areas 117 spaced apart along the second direction B. The positive electrode electrical connection portion 115 is disposed in the middle of the grid line segment 119 of the positive electrode fine grid line 113, and the positive electrode electrical connection portion 115 is suitable for being electrically connected to the first interconnection structure 121, that is, along the first direction A, the plurality of positive electrode electrical connection portions 115 and the plurality of first avoidance areas 117 are alternately spaced apart, and the first interconnection structure 121 is sequentially connected to the positive electrode electrical connection portion 115 and the first glue point 131 disposed in the first avoidance area 117.

[0048] The interval between two adjacent grid line segments 119 of the positive electrode fine grid line 113 is the second avoidance area 114, and the plurality of grid line segments 119 define a plurality of second avoidance areas 114 spaced apart along the second direction B. The negative electrode electrical connection portion 118 is disposed at the middle of the grid line segment 119 of the negative electrode fine grid line 116, and the negative electrode electrical connection portion 118 is suitable for being electrically connected to the second interconnection structure 122, that is, along the first direction A, the plurality of negative electrode electrical connection portions 118 and the plurality of second avoidance areas 114 are alternately spaced apart, and the second interconnection structure 122 is sequentially connected to the negative electrode electrical connection portion 118 and the second glue point 132 disposed in the second avoidance area 114.

[0049] Thus, along the first direction A, the first avoidance area 117 and the positive electrode electrical connection portion 115 are on the same straight line to facilitate the connection of the first interconnection structure 121, and the second avoidance area 114 and the negative electrode electrical connection portion 118 are on the same straight line to facilitate the connection of the second interconnection structure 122. The processing technology of the first interconnection structure 121 and the second interconnection structure can be simplified, thereby simplifying the production process of the battery assembly 10 and reducing the production cost.

[0050] According to some embodiments of the present invention, Figure 2 As shown, the maximum width of the positive electrical connection portion 115 along the first direction A is greater than or equal to the width of the remaining portion of the gate line segment 119 of the positive fine gate line 113 except the positive electrical connection portion 115 along the first direction A; the maximum width of the negative electrical connection portion 118 along the first direction A is greater than or equal to the width of the remaining portion of the gate line segment 119 of the negative fine gate line 116 except the positive electrical connection portion 115 along the first direction A.

[0051] The width of the positive electrode electrical connection portion 115 in the first direction A is large, which is beneficial to increase the connection area between the positive electrode electrical connection portion 115 and the first interconnection structure 121, and ensure the welding strength between the positive electrode electrical connection portion 115 and the first interconnection structure 121. The width of the negative electrode electrical connection portion 118 in the first direction A is large, which is beneficial to increase the connection area between the negative electrode electrical connection portion 118 and the second interconnection structure 122, and ensure the welding strength between the negative electrode electrical connection portion 118 and the second interconnection structure 122.

[0052] Thus, the connection strength between the first interconnecting structure 121 and the positive electrode electrical connection portion 115 and the second interconnecting structure 122 and the negative electrode electrical connection portion 118 can be enhanced, thereby ensuring the current transmission performance of the battery cell 11 and improving the reliability of the battery cell 11 .

[0053] According to some embodiments of the present invention, Figure 2 As shown, the length of the positive electrode electrical connection portion 115 in the second direction B is L 1 The width of the positive electrode electrical connection portion 115 in the first direction A is W 1 , L 1 , W 1 Satisfy: 0≤L 1 ≤1.5mm, 30μm≤W 1 ≤80μm; the length of the negative electrode electrical connection portion 118 in the second direction B is L 2 The width of the negative electrode electrical connection portion 118 in the first direction A is W 2 , L 2 , W 2 Satisfy: 0≤L 2 ≤1.5mm, width 30μm≤W 2 ≤80μm.

[0054] The width of the positive electrode electrical connection portion 115 and the negative electrode electrical connection portion 118 in the first direction A and the length in the second direction B are used to define the area of ​​the positive electrode electrical connection portion 115 and the negative electrode electrical connection portion 118. If the area of ​​the positive electrode electrical connection portion 115 or the negative electrode electrical connection portion 118 is too large, it is easy to make the interval between the positive electrode electrical connection portion 115 and the negative electrode fine grid line 116 too small or the interval between the negative electrode electrical connection portion 118 and the positive electrode fine grid line 113 too small, resulting in a short circuit in the electrical connection between the positive electrode fine grid line 113 and the negative electrode fine grid line 116. If the area of ​​the positive electrode electrical connection portion 115 or the negative electrode electrical connection portion 118 is too small, it is easy to cause the connection strength between the positive electrode electrical connection portion 115 and the first interconnection structure 121, and between the negative electrode electrical connection portion 118 and the second interconnection structure 122 to be too small.

[0055] Thus, the length of the positive electrode electrical connection portion 115 and the width of the negative electrode electrical connection portion 118 in the second direction B and the width in the first direction A are respectively limited, so as to limit the area size of the positive electrode electrical connection portion 115 and the negative electrode electrical connection portion 118, and further limit the connection area between the positive electrode electrical connection portion 115 and the first interconnection structure 121, and between the negative electrode electrical connection portion 118 and the second interconnection structure 122, so as to ensure the connection strength and electrical connection effect between the positive electrode electrical connection portion 115 and the first interconnection structure 121, and between the negative electrode electrical connection portion 118 and the second interconnection structure 122.

[0056] According to some embodiments of the present invention, Figure 1 As shown, the interconnection structure 12 is a circular welding strip, and the diameter of the interconnection structure 12 is d, wherein d satisfies: 0.15 mm≤d≤0.35 mm.

[0057] If the diameter of the interconnection structure 12 is greater than 0.35 mm, the diameter of the interconnection structure 12 is too large, so that the welding area between the interconnection structure 12 and the fine grid line 112 is too large, resulting in more heat generated during welding, causing the insulating glue to shrink and warp. If the diameter of the interconnection structure 12 is less than 0.15 mm, the diameter of the interconnection structure 12 is too small, so that the structural strength of the interconnection structure 12 is too low, and it is easy to break during welding.

[0058] Thus, the diameter range of the interconnection structure 12 is limited to ensure the structural strength of the interconnection structure 12 , while ensuring the structural strength of the battery cell 11 , preventing damage to the battery cell 11 and power loss, and ensuring the electrical performance of the battery assembly 10 .

[0059] The battery string 100 according to the second embodiment of the present invention includes the battery assembly 10 according to the first embodiment of the present invention.

[0060] Combination Figure 1 The battery string 100 includes a plurality of battery assemblies 10, and the plurality of battery assemblies 10 are connected in series via an interconnection structure 12. Taking the battery string 100 including three battery assemblies 10 as an example, the three battery assemblies 10 are arranged in sequence along the first direction A, wherein the first battery assembly 10 is connected to the second battery assembly 10 via a first interconnection structure 121, and the second battery assembly 10 is connected to the third battery assembly 10 via a second interconnection structure 122, and so on, the battery string 100 structure including a plurality of battery assemblies 10, that is, the connection between adjacent battery assemblies 10 is alternately arranged by connection with the first interconnection structure 121 and connection with the second interconnection structure 122.

[0061] According to the battery string 100 of the embodiment of the utility model, by using the battery assembly 10 described in the above embodiment, the production cost of the battery string 100 can be effectively reduced, the production process of the battery string 100 can be simplified, and the structural strength of the battery string 100 can be improved, thereby extending the service life of the battery string 100.

[0062] A photovoltaic assembly of back-contact cells according to an embodiment of the third aspect of the utility model comprises a cell string 100 according to an embodiment of the second aspect of the utility model.

[0063] The preparation process of the photovoltaic module of the back contact cell is as follows: first, the cell is cut into a plurality of cell sheets 11, the cell sheets 11 include a plurality of grid line segments 119, glue dots 13 are printed between the grid line segments 119, a first interconnection structure 121 and a second interconnection structure 122 are laid on the cell sheets 11, the glue dots 13 are cured to fix the first interconnection structure 121 and the second interconnection structure 122 on the cell sheets 11, and then the first interconnection structure 121 is welded to the positive electrode fine grid line 113, and the second interconnection structure 122 is welded to the negative electrode fine grid line 116 to form a cell assembly 10. A plurality of cell assemblies 10 are connected to form a cell string 100, and the cell string 100 is laminated to finally form a photovoltaic module of the back contact cell.

[0064] According to the photovoltaic module with back-contact cells according to the embodiment of the utility model, by using the cell string 100 of the above-mentioned embodiment, the production cost of the photovoltaic module with back-contact cells can be effectively reduced, the probability of damage to the cell 11 during the production process can be reduced, the warping phenomenon that may occur after welding of the cell 11 can be reduced, the risk of hidden cracks after lamination can be reduced, the overall structural strength of the photovoltaic module with back-contact cells can be improved, the electrical performance of the photovoltaic module with back-contact cells can be guaranteed, and the service life of the photovoltaic module with back-contact cells can be extended.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0068] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that: include: A battery cell, the battery cell comprising a battery cell body and a plurality of fine grid lines, the plurality of fine grid lines comprising a plurality of positive fine grid lines and a plurality of negative fine grid lines, the plurality of positive fine grid lines and the plurality of negative fine grid lines being alternately arranged on the battery cell body along a first direction, each of the fine grid lines comprising a plurality of grid line segments, the plurality of grid line segments being arranged at intervals along a second direction, the first direction being perpendicular to the second direction; A plurality of interconnection structures, the plurality of interconnection structures comprising a plurality of first interconnection structures and a plurality of second interconnection structures, the plurality of first interconnection structures and the plurality of second interconnection structures are alternately arranged along the second direction, the plurality of first interconnection structures and the plurality of second interconnection structures extend along the first direction, the plurality of first interconnection structures are electrically connected to the plurality of positive electrode fine grid lines, and the plurality of second interconnection structures are electrically connected to the plurality of negative electrode fine grid lines; A plurality of glue spots, the plurality of glue spots include a plurality of first glue spots and a plurality of second glue spots, the first glue spots are arranged between the first interconnecting structure and the battery cell body, the first glue spots are located between two adjacent grid line segments of the negative electrode fine grid line, the second glue spots are arranged between the second interconnecting structure and the battery cell body, the second glue spots are located between two adjacent grid line segments of the positive electrode fine grid line.

2. The battery assembly according to claim 1, characterized in that: The first glue dots are spaced apart from the adjacent positive electrode fine grid lines; The second glue dots are spaced apart from the adjacent negative electrode fine grid lines.

3. The battery assembly according to claim 1, characterized in that: The glue dots are insulating glue.

4. The battery assembly according to claim 1, characterized in that: The width of the first glue dot in the first direction is greater than the width of the negative electrode fine grid line in the first direction, and the length of the first glue dot in the second direction is greater than the width of the first interconnection structure in the second direction; The width of the second glue dot in the first direction is greater than the width of the positive electrode fine grid line in the first direction, and the length of the second glue dot in the second direction is greater than the width of the second interconnection structure in the second direction.

5. The battery assembly according to claim 1, characterized in that: A first avoidance area is defined between two adjacent gate line segments of the negative electrode fine gate line, and the first glue spot is located in the first avoidance area; a second avoidance area is defined between two adjacent gate line segments of the positive electrode fine gate line, and the second glue spot is located in the second avoidance area; The gate line segment of the positive electrode fine gate line includes a positive electrode electrical connection portion, and the positive electrode electrical connection portion is opposite to the first avoidance area along the first direction; The gate line segment of the negative electrode fine gate line includes a negative electrode electrical connection portion, and the negative electrode electrical connection portion is opposite to the second avoidance area along the first direction.

6. The battery assembly according to claim 5, characterized in that: The maximum width of the positive electrode electrical connection portion along the first direction is greater than or equal to the width of the remaining portion of the gate line segment of the positive electrode fine gate line except the positive electrode electrical connection portion along the first direction; The maximum width of the negative electrode electrical connection portion along the first direction is greater than or equal to the width of the remaining portion of the gate line segment of the negative electrode fine gate line except the positive electrode electrical connection portion along the first direction.

7. The battery assembly according to claim 5, characterized in that: The length of the positive electrode electrical connection portion in the second direction is L1, and the width of the positive electrode electrical connection portion in the first direction is W1, and L1 and W1 satisfy: 0≤L1≤1.5mm, 30μm≤W1≤80μm; The length of the negative electrode electrical connection portion in the second direction is L2, and the width of the negative electrode electrical connection portion in the first direction is W2, and L2 and W2 satisfy: 0≤L2≤1.5mm, and the width is 30μm≤W2≤80μm.

8. The battery assembly according to any one of claims 1 to 7, characterized in that: The interconnection structure is a circular welding strip, and the diameter of the interconnection structure is d, wherein d satisfies: 0.15 mm≤d≤0.35 mm.

9. A battery string, characterized in that: Comprising a battery assembly according to any one of claims 1-8.

10. A photovoltaic module with a back contact cell, characterized in that: Comprising a battery string according to claim 9.

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