Battery piece and photovoltaic module
By adjusting the printing direction of the main gate line on the cell and the layout of the components, a larger-sized cell is formed, which solves the problems of low power and high cost of existing photovoltaic modules, and achieves higher power and lower cost photovoltaic modules.
Patent Information
- Application Number
- CN202420741309.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-04-10
AI Technical Summary
The existing photovoltaic modules have lower power and higher costs, and the maximum version of rectangular cell is only 72 versions, making it difficult to meet the needs of larger sizes and higher power.
By adjusting the printing direction of the main gate lines on the cell body and the layout of the components, the extension direction of each main gate line is the same as the width direction of the cell body. The multiple main gate lines are arranged at intervals along the length direction of the cell body to form a larger size cell, and then assemble a higher power photovoltaic module.
It achieves the effect of larger size, higher power and lower cost of photovoltaic modules, and is compatible with the production processes and equipment of conventional components, reducing the overall cost.
Smart Images
Figure CN222814777U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a cell sheet and a photovoltaic assembly. Background Art
[0002] With the rapid development of the solar photovoltaic industry, photovoltaic modules are increasingly being used. At present, photovoltaic modules are usually formed by connecting multiple solar cell strings in series and in parallel in multiple columns (rows).
[0003] In the related technology, in order to increase the power of photovoltaic modules, expanding the size of cells or the module format is a more effective means. However, the rectangular cells in the industry are usually 182*19Xmm in size, and the maximum module format can only be 72, which has low power and high cost. Utility Model Content
[0004] The first aspect of the utility model provides a battery cell to solve the above technical defects in the prior art. By adjusting the printing direction of the main grid lines on the battery cell body and the layout of the components, the size of the components can be larger, the power is higher, and the cost is lower.
[0005] A second aspect of the utility model provides a photovoltaic module.
[0006] The first aspect of the utility model provides a battery cell, comprising:
[0007] The battery cell body is provided with a plurality of main grid lines and a plurality of auxiliary grid lines, the main grid lines and the auxiliary grid lines are electrically connected, and the main grid lines and the auxiliary grid lines are arranged perpendicular to each other;
[0008] Wherein, the extension direction of each of the main grid lines is the same as the width direction of the battery cell body, and a plurality of the main grid lines are arranged at intervals along the length direction of the battery cell body.
[0009] According to the battery cell provided by the utility model, the length of the battery cell body is L1, wherein 190mm≤L1≤230mm; the width of the battery cell body is W1, wherein 166mm≤W1≤195mm.
[0010] According to the battery cell provided by the utility model, the number of the main grid lines is M, wherein 16≤M≤24.
[0011] According to the battery cell provided by the utility model, the distance between two adjacent main grid lines is D1, wherein 9mm≤D1≤12mm.
[0012] According to the battery cell provided by the utility model, the number of the secondary grid lines is N, wherein 140≤N≤190.
[0013] According to the battery cell provided by the utility model, the distance between two adjacent secondary grid lines is D2, wherein 1mm≤D2≤3mm.
[0014] According to the battery cell provided by the utility model, a plurality of the main grid lines and a plurality of the auxiliary grid lines are arranged on the back side of the battery cell body.
[0015] According to the battery cell provided by the utility model, a plurality of main grid lines and a plurality of auxiliary grid lines are arranged on the front of the battery cell body, the main grid lines and the auxiliary grid lines are electrically connected, and the main grid lines and the auxiliary grid lines are arranged perpendicular to each other;
[0016] or,
[0017] A plurality of secondary grid lines are arranged on the front side of the battery cell body, and the secondary grid lines located on the front side of the battery cell body and the secondary grid lines located on the back side of the battery cell body extend in the same direction.
[0018] According to the battery cell provided by the utility model, at least one chamfer is provided on the battery cell body, and the central angle corresponding to the arc length of the chamfer is α, wherein 0.3°≤α≤3°.
[0019] A photovoltaic module provided in a second aspect of the present invention comprises at least one battery string, wherein the battery string is composed of a plurality of battery units connected together, and the battery unit is one half of any one of the battery cells described above;
[0020] The length of the photovoltaic module is L2, wherein 1700 mm ≤ L2 ≤ 2480 mm, and the width of the photovoltaic module is W2, wherein 1100 mm ≤ W2 ≤ 1450 mm.
[0021] According to the photovoltaic assembly provided by the utility model, along the length direction of the photovoltaic assembly, the gap between two adjacent battery cells is W3, wherein W3≤2mm;
[0022] Along the width direction of the photovoltaic module, the gap between two adjacent battery cells is L3, wherein 1mm≤L3≤2mm.
[0023] The battery cell provided by the utility model can make the size of the component larger, the power higher and the cost lower by setting the extension direction of each main grid line to be the same as the width direction of the battery cell body, arranging multiple main grid lines at intervals along the length direction of the battery cell body, and adjusting the printing direction of the main grid lines on the battery cell body and the layout mode of the component. When the battery unit formed by the battery cell is used to form a photovoltaic component, the length direction of the battery unit is located in the width direction of the photovoltaic component as a whole, and the width direction of the battery unit is located in the length direction of the photovoltaic component. With this arrangement, the photovoltaic component can be directly adapted to the production process and equipment of conventional components, the production line compatibility is good, the comprehensive cost is lower, that is, the manufacturing cost and system cost are lower, and the practicality is strong.
[0024] Compared with the prior art, in rectangular cells, the main grid lines are parallel to the long sides of the cell body (i.e., extending in the length direction), and the maximum format of the photovoltaic module formed in this way is 72 format, which has low power and high cost. However, the utility model improves the structure, sets the extension direction of each main grid line to be the same as the width direction of the cell body, and arranges multiple main grid lines at intervals along the length direction of the cell body. The photovoltaic module composed of cells arranged in this way has a small size change, can be made into 78 format, has high power and low transportation cost; at the same time, the cells arranged in this way have good compatibility and low overall cost.
[0025] The photovoltaic module provided in the embodiment of the utility model has all the above advantages because it includes the above-mentioned solar cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0027] Figure 1 It is a schematic diagram of the structure of a battery cell provided by an embodiment of the utility model;
[0028] Figure 2 It is a structural schematic diagram of a battery unit provided by an embodiment of the utility model;
[0029] Figure 3 It is a schematic diagram of the structure of a photovoltaic assembly provided by an embodiment of the utility model;
[0030] Figure 4 It is a schematic diagram of the partial structure of a photovoltaic module provided in an embodiment of the utility model.
[0031] Reference numerals:
[0032] 100, battery cell body; 110, main grid line; 120, chamfer; 130, battery cell. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0035] In the embodiments of 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" or "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" or "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.
[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0037] Figure 1 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the utility model.
[0038] See also Figure 1 The embodiment of the utility model provides a battery cell, which includes a rectangular battery cell body 100, and the battery cell body 100 has a long side (i.e., a length direction) and a short side (i.e., a width direction). The battery cell body 100 is provided with a plurality of main grid lines 110 and a plurality of auxiliary grid lines (not shown in the figure), the main grid lines 110 and the auxiliary grid lines are electrically connected, and the main grid lines 110 and the auxiliary grid lines are arranged perpendicular to each other; wherein, the extension direction of each main grid line 110 is the same as the width direction of the battery cell body 100, and the plurality of main grid lines 110 are arranged at intervals along the length direction of the battery cell body 100.
[0039] This is equivalent to the main grid line 110 being parallel to the width direction of the cell body 100. When the battery cell 130 formed by the cell is used to form a photovoltaic module, the length direction of the battery cell 130 is located in the width direction of the photovoltaic module as a whole, and the width direction of the battery cell 130 is located in the length direction of the photovoltaic module. By adjusting the printing direction and layout of the main grid line 110 on the cell body 100, the size of a single cell can be made larger and the power higher.
[0040] It should be noted that multiple main grid lines 110 and multiple auxiliary grid lines can be arranged on the back of the battery cell body 100 to form a back-contact battery, that is, a BC type battery. The front of the back-contact battery uses a SiNx / SiOx double-layer anti-reflection passivation film, there are no metal grid lines, and the emitters and back fields of P+ and N+ and the positive and negative electrodes of the corresponding areas are arranged on the back of the battery.
[0041] In addition, multiple main grid lines 110 and multiple auxiliary grid lines can be set on the back of the battery cell body 100, the main grid line 110 is silver paste, and the auxiliary grid line is aluminum paste; multiple auxiliary grid lines are set on the front of the battery cell body 100 to form a 0BB type battery (without main grid). The 0BB type battery is a further upgrade of the SMBB technology. On the one hand, the main grid line on the front of the battery cell is directly eliminated to further reduce the silver consumption; on the other hand, the copper welding strip is used to replace the original main grid line on the front of the battery cell to derive current in the assembly link. The diameter of the welding strip is smaller, about 0.2mm, and the shading area is smaller, which can further improve the power of the photovoltaic module.
[0042] In addition, multiple main grid lines 110 and multiple auxiliary grid lines can be respectively arranged on the front and back of the battery cell body 100 to form an MBB type battery or an SMBB type battery. The types of the above battery cells are not limited to this, as long as one side of the battery cell includes a main grid line and an auxiliary grid line, this type of battery is included in the protection scope of the present utility model.
[0043] It can be understood that the cell provided in this practical embodiment can make the size of the component larger, the power higher, and the cost lower by setting the extension direction of each main grid line 110 to be the same as the width direction of the cell body 100, arranging multiple main grid lines 110 at intervals along the length direction of the cell body 100, and adjusting the printing direction of the main grid lines 110 on the cell body 100 and the layout of the component. When the battery unit 130 formed by the cell is used to form a photovoltaic component, the length direction of the battery unit 130 is located in the width direction of the photovoltaic component as a whole, and the width direction of the battery unit 130 is located in the length direction of the photovoltaic component. With this arrangement, the photovoltaic component can be directly adapted to the production process and equipment of conventional components, the production line compatibility is better, the overall cost is lower, that is, the manufacturing cost and system cost are lower, and the practicality is stronger.
[0044] Compared with the prior art, in a rectangular cell, the main grid line 110 is parallel to the long side of the cell body 100 (i.e., extends along the length direction), and the maximum format of the photovoltaic module formed in this way is 72 format, which has low power and high cost. However, the utility model improves the structure, sets the extension direction of each main grid line 110 to be the same as the width direction of the cell body 100, and arranges multiple main grid lines 110 at intervals along the length direction of the cell body 100. The photovoltaic module composed of cells arranged in this way has a small size change, can be made into a 78 format, has high power, and has low transportation cost; at the same time, the cell arranged in this way has good compatibility and low overall cost.
[0045] Figure 2 It is a schematic diagram of the structure of the battery unit 130 provided in an embodiment of the present utility model.
[0046] See also Figure 1 and Figure 2 In some embodiments of the present invention, the length of the battery cell body 100 is L1, wherein 190mm≤L1≤230mm, that is, the value of L1 can be any value within the numerical range, such as 191mm, 192mm, 195mm, 198mm, 201mm, 203mm, 210mm, 221mm, 225mm or 227mm.
[0047] The width of the battery cell body 100 is W1, wherein 166mm≤W1≤195mm, that is, the value of W1 can be 166mm, 168mm, 170mm, 175mm, 178mm, 180mm, 185mm, 186mm, 190mm, 192mm or 195mm, etc., any value within the numerical range.
[0048] In some embodiments of the present invention, the number of the main grid lines 110 is M, wherein 16≤M≤24, that is, the value of M can be 16, 18, 20, 22 or 24, etc., any value within the numerical range.
[0049] In some embodiments of the present invention, the spacing between two adjacent main grid lines 110 is D1, where 9mm≤D1≤12mm, that is, the value of D1 can be 9mm, 9.5mm, 10mm, 10.6mm, 10.8mm, 11mm, 11.5mm or 12mm, etc., any value within the numerical range.
[0050] In some embodiments of the present invention, the number of secondary grid lines is N, where 140≤N≤190, that is, the value of N can be 140, 145, 150, 155, 160, 165, 170, 175 or 190, etc., any value within the numerical range.
[0051] The main grid line 110 is directly connected to the external lead of the cell and is set relatively thick, while the auxiliary grid line collects and transmits current to the main grid line 110 and is set relatively thin. By limiting the number of main grid lines 110 and auxiliary grid lines on a cell of a preset size, the shading effect and optical gain of the cell can be affected.
[0052] In the utility model, the length of the battery cell body 100 is in the range of 190mm to 230mm, the width of the battery cell body 100 is in the range of 166mm to 195mm, the number of main grid lines 110 is set between 16 and 24, and the number of secondary grid lines is set between 140 and 190. In this way, by limiting the number of secondary grid lines, the shading area of the secondary grid lines is reduced while the current transmission efficiency of the secondary grid lines is guaranteed, which is beneficial to improving the efficiency of the battery cell.
[0053] Among them, the cross-sectional shape of the secondary grid line can be triangular or arc-shaped. Such a setting can reduce the shading effect of the secondary grid line and increase the optical gain. The triangular or arc-shaped secondary grid line can utilize the refraction and reflection of light to reintroduce part of the shading light into the battery cell, thereby improving the photoelectric conversion rate of the battery.
[0054] In some embodiments of the present invention, the spacing between two adjacent secondary grid lines is D2, wherein 1mm≤D2≤3mm, that is, the value of D2 can be any value within the numerical range such as 1mm, 2mm, 2.5mm or 3mm.
[0055] In some embodiments of the utility model, a plurality of main grid lines 110 and a plurality of auxiliary grid lines can be arranged on the back of the cell body 100 to form a back contact cell. The front of the back contact cell adopts a SiNx / SiOx double-layer anti-reflection passivation film, and there is no metal grid line. The emitter and back field of P+ and N+ and the positive and negative electrodes of the corresponding area are arranged on the back of the cell. This type of cell can maximize the use of incident light and reduce optical losses, thereby achieving the purpose of improving the photoelectric conversion efficiency, because the front side avoids the shielding of light by the metal grid line electrode. The back contact cell is a further upgrade of the HJT and TOPCon technology, and the conversion efficiency is higher than that of TOPCon and HJT.
[0056] In some embodiments of the present invention, at least one chamfer 120 is provided on the battery cell body 100 , and the central angle corresponding to the arc length of the chamfer 120 is α, wherein 0.3°≤α≤3°.
[0057] By limiting the central angle of the arc length of the chamfer 120 structure on the battery cell, it is beneficial to improve the utilization rate of the silicon rod, while reducing the possibility of stress concentration on the edge of the battery cell, which is beneficial to extend the service life of the battery cell.
[0058] Figure 3 It is a schematic diagram of the structure of a photovoltaic assembly provided by an embodiment of the utility model; Figure 4 It is a schematic diagram of the partial structure of a photovoltaic module provided in an embodiment of the utility model.
[0059] See also Figure 3 and Figure 4 The second aspect of the utility model provides a photovoltaic module, which includes at least one battery string, the battery string is composed of a plurality of battery cells 130 connected together, and the battery cell 130 is one half of the above-mentioned battery sheet.
[0060] The length of the photovoltaic module is L2, wherein 1700mm≤L2≤2480mm, that is, the value of L2 can be 1700mm, 1800mm, 1900mm, 2000mm, 2100mm, 2300mm, 2400mm or 2480mm, etc., any value within the numerical range.
[0061] The width of the photovoltaic module is W2, wherein 1100mm≤W2≤1450mm, that is, the value of W2 can be 1100mm, 1150mm, 1200mm, 1300mm, 1350mm, 1400mm, 1420mm or 1450mm, etc., any value within the numerical range.
[0062] In some embodiments of the present invention, along the length direction of the photovoltaic module, the gap between two adjacent battery cells 130 is W3, where W3≤2mm, that is, the value of W3 can be 2mm, 1.5mm, 1.2mm, 1.1mm, 1mm, 0.8mm, 0.6mm or 0.5mm, etc., any value within the numerical range.
[0063] Along the width direction of the photovoltaic module, the gap between two adjacent battery cells 130 is L3, where 1mm≤L3≤2mm, that is, the value of L3 can be 1mm, 1.2mm, 1.3mm, 1.6mm, 1.8mm, 1.9mm or 2mm, etc., any value within the numerical range.
[0064] It can be understood that the photovoltaic module provided in the embodiment of the utility model adopts a photovoltaic module composed of cells in which the extension direction of each main grid line 110 is set to be the same as the width direction of the cell body 100, and multiple main grid lines 110 are arranged at intervals along the length direction of the cell body 100. The size of the photovoltaic module varies little, and can be made into a 78-format, with higher power and lower transportation cost. At the same time, the cell using such a setting has better compatibility and can be set to any format structure as needed.
[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A battery cell, characterized in that: include: The battery cell body is provided with a plurality of main grid lines and a plurality of auxiliary grid lines, the main grid lines and the auxiliary grid lines are electrically connected, and the main grid lines and the auxiliary grid lines are arranged perpendicular to each other; Wherein, the extension direction of each of the main grid lines is the same as the width direction of the battery cell body, and a plurality of the main grid lines are arranged at intervals along the length direction of the battery cell body.
2. The battery cell according to claim 1, characterized in that: The length of the battery cell body is L1, wherein 190 mm ≤ L1 ≤ 230 mm; the width of the battery cell body is W1, wherein 166 mm ≤ W1 ≤ 195 mm.
3. The battery cell according to claim 1, characterized in that: The number of the main grid lines is M, wherein 16≤M≤24.
4. The battery cell according to claim 3, characterized in that: The distance between two adjacent main grid lines is D1, wherein 9mm≤D1≤12mm.
5. The battery cell according to claim 1, characterized in that: The number of the secondary gate lines is N, wherein 140≤N≤190.
6. The battery cell according to claim 5, characterized in that: The distance between two adjacent secondary grid lines is D2, wherein 1mm≤D2≤3mm.
7. The battery cell according to any one of claims 1 to 6, characterized in that: A plurality of the main grid lines and a plurality of the auxiliary grid lines are arranged on the back side of the battery cell body.
8. The battery cell according to claim 7, characterized in that: A plurality of main grid lines and a plurality of auxiliary grid lines are arranged on the front side of the battery cell body, the main grid lines and the auxiliary grid lines are electrically connected, and the main grid lines and the auxiliary grid lines are arranged perpendicular to each other; or, A plurality of secondary grid lines are arranged on the front side of the battery cell body, and the secondary grid lines located on the front side of the battery cell body and the secondary grid lines located on the back side of the battery cell body extend in the same direction.
9. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell body is provided with at least one chamfer, and the central angle corresponding to the arc length of the chamfer is α, wherein 0.3°≤α≤3°.
10. A photovoltaic module, characterized in that: The invention comprises at least one battery string, wherein the battery string is composed of a plurality of battery cells connected together, and the battery cell is one half of the battery cell according to any one of claims 1 to 9; The length of the photovoltaic module is L2, wherein 1700 mm ≤ L2 ≤ 2480 mm, and the width of the photovoltaic module is W2, wherein 1100 mm ≤ W2 ≤ 1450 mm.
11. The photovoltaic module according to claim 10, characterized in that: Along the length direction of the photovoltaic module, the gap between two adjacent battery cells is W3, where W3≤2mm; Along the width direction of the photovoltaic module, the gap between two adjacent battery cells is L3, wherein 1mm≤L3≤2mm.