Back contact solar cell, cell module and photovoltaic system
By increasing the width difference of the isolation region and setting an additional isolation region in the back-contact solar cell, the leakage problem between the fine grid and the irregular main grid is solved, thereby improving the cell's isolation effect and current collection performance.
Patent Information
- Application Number
- CN202423291615.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing back-contact solar cells, there is a high risk of leakage between the fine grid and the heterogeneous main grid, which can easily lead to leakage.
In the structure of a back-contact solar cell, by setting the width of the second isolation region along the second direction to be greater than the width of the first isolation region along the first direction, the spacing between the third region and the first region is increased, and a third isolation region is set between the third region and the connection area of the adjacent second region, thereby improving the isolation effect and reducing the risk of leakage.
This effectively reduces the risk of leakage between the fine grid and the irregular main grid, improving the battery's operational reliability and current collection efficiency.
Smart Images
Figure CN223681438U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field, concretely relates to a back contact solar cell, battery assembly and photovoltaic system. BACKGROUND
[0002] The back contact (Interdigitated back contact, IBC) solar cell, namely the interdigital back contact battery, the positive / negative electrode grid line is designed on the back of the battery, so that the front surface avoids the shielding of the metal grid line completely, eliminates the optical loss caused by the electrode grid line shielding, and the electrode grid line can be designed wider than the existing one, reduces the series resistance loss, thereby greatly improves the battery conversion efficiency. In addition, due to the design of no electrode grid line on the front surface of the battery, the product appearance is more beautiful, and is suitable for various application scenarios.
[0003] In the related art, the back of the back contact solar cell usually includes a first region arranged along a first direction, a second region and a third region alternately and interval arranged along a second direction, and the second direction is perpendicular to the first direction; wherein the first region is provided with a first main grid, the second region is provided with a first fine grid, the third region is provided with a second fine grid, the polarity of the first fine grid is the same as that of the first main grid, and the polarity of the second fine grid is opposite to that of the first main grid; in order to prevent the electric leakage between the second fine grid and the first main grid and the electric leakage between the second fine grid and the first fine grid, the isolation area is arranged between the second fine grid and the first main grid and between the second fine grid and the first fine grid for physical isolation, and the width of the isolation area between the second fine grid and the first main grid and between the second fine grid and the first fine grid is usually equal, there is a higher electric leakage risk between the fine grid and the opposite main grid, and the electric leakage phenomenon is prone to occur. SUMMARY
[0004] The utility model provides a back contact solar cell, aims at solving the problem of the higher electric leakage risk between the fine grid and the opposite main grid of the prior art back contact solar cell, and the electric leakage problem is prone to occur.
[0005] The utility model provides a back contact solar cell, comprising:
[0006] The first region provided with the first main grid is arranged along the first direction;
[0007] The second region provided with the first fine grid is arranged along the second direction and connected with the first region, and the polarity of the first fine grid is the same as that of the first main grid; and
[0008] The third region provided with the second fine grid is arranged along the second direction and spaced from the first region, the third region and the second region are alternately and interval arranged along the first direction, and the second direction intersects with the first direction.
[0009] The second region comprises a main body region, a connecting region connecting the main body region and the first region, a first isolation region provided between the third region and the main body region adjacent to the second region, and a second isolation region provided between the third region and the first region, wherein the width of the second isolation region along the second direction is greater than the width of the first isolation region along the first direction.
[0010] Preferably, a third isolation region is provided between the third region and the connecting region adjacent to the second region, and the width of the third isolation region along the first direction is greater than the width of the first isolation region along the first direction.
[0011] Preferably, the ratio of the width of the second isolation region along the second direction to the width of the first isolation region along the first direction is 1.1-2.
[0012] Preferably, the ratio of the width of the second isolation region along the second direction to the width of the first isolation region along the first direction is 1.1-1.5.
[0013] Preferably, the width of the second isolation region along the second direction is equal to the width of the third isolation region along the first direction.
[0014] Preferably, the width of the second isolation region along the second direction is 60-200 microns, and the width of the first isolation region along the first direction is 66-300 microns.
[0015] Preferably, the width of the connecting region along the first direction is greater than 100 microns.
[0016] Preferably, the width of the second isolation region along the second direction is greater than the width of the third isolation region along the first direction.
[0017] The utility model provides a kind of battery assembly, including above-mentioned back contact solar cell.
[0018] The utility model provides a kind of photovoltaic system, including above-mentioned battery assembly.
[0019] The utility model provides a kind of back contact solar cell, including the first area being equipped with first main grid, the second area being equipped with first fine grid, and the third area being equipped with second fine grid, second area is along second direction setting and is connected with first area, the polarity of first fine grid is same with the polarity of first main grid;Second area is along second direction setting and is spaced apart with first area, third area and second area are along first direction alternately spaced apart, second direction is perpendicular to first direction;First isolation zone is arranged between third area and the main body area of adjacent second area, second isolation zone is arranged between third area and first area, the width along second direction of second isolation zone is greater than the width along first direction of first isolation zone, so that the spacing between third area and first area is greater than the spacing between third area and the main body area of adjacent second area, improve the isolation effect between second fine grid and first main grid, to reduce the risk of electric leakage between fine grid and opposite main grid, improve battery work reliability. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 Part structure schematic diagram of the back of a kind of back contact solar cell provided by the utility model embodiment is shown;
[0021] Figure 2 For Figure 1 Enlarged schematic view of local part A. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below in combination with drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.
[0023] The utility model embodiment provides a kind of back contact solar cell, by the first isolation zone between third area and the main body area of adjacent second area, second isolation zone is arranged between third area and first area, the width along second direction of second isolation zone is greater than the width along first direction of first isolation zone, so that the spacing between third area and first area is greater than the spacing between third area and the main body area of adjacent second area, improve the isolation effect between second fine grid and first main grid, to reduce the risk of electric leakage between fine grid and opposite main grid, improve battery work reliability.
[0024] Please refer to Figures 1-2 The utility model provides a kind of back contact solar cell, comprising:
[0025] The first area 1 being equipped with first main grid 11, first area 1 is along first direction Y setting;
[0026] The second region 2 provided with the first fine grid 21 is arranged along the second direction X and connected with the first region 1, and the polarity of the first fine grid 21 is the same as that of the first main grid 11.
[0027] The third region 3 provided with the second fine grid 31 is arranged along the second direction X and spaced from the first region 1, and the third region 3 is alternately and spacedly arranged with the second region 2 along the first direction Y, and the second direction X intersects with the first direction Y.
[0028] The second region 2 comprises a main body area 22, a connecting area 23 connecting the main body area 22 and the first region 1, a first isolation area 51 arranged between the third region 3 and the main body area 22 of the adjacent second region 2, and a second isolation area 52 arranged between the third region 3 and the first region 1, and the width L1 of the second isolation area 52 along the second direction X is greater than the width L2 of the first isolation area 51 along the first direction Y.
[0029] The width L1 of the second isolation area 52 along the second direction X is the distance between the third region 3 and the first region 1, and the width L2 of the first isolation area 51 along the first direction Y is the distance between the third region 3 and the main body area 22 of the adjacent second region 2, and it can be understood that the distance between the third region 3 and the first region 1 is greater than the distance between the third region 3 and the main body area 22 of the adjacent second region 2.
[0030] In the embodiment of the utility model, the first region 1, the second region 2 and the third region 3 are arranged on the back of the back contact solar cell, the first region 1 and the second region 2 have the same polarity, and the third region 3 has opposite polarity with the first region 1 and the second region 2. For example, the first region 1 and the second region 2 can be P-type regions, the first main grid 11 and the first fine grid 21 are P-type grid lines, and the third region 3 is an N-type region, and the second fine grid 31 is an N-type grid line. Alternatively, the first region 1 and the second region 2 are N-type regions, the first main grid 11 and the first fine grid 21 are N-type grid lines, the third region 3 is a P-type region, and the second fine grid 31 is a P-type grid line.
[0031] In the embodiment of the utility model, the first direction Y and the second direction X are arranged to intersect. Preferably, the first direction Y and the second direction X are perpendicular. The first direction Y is the same as the width direction of the first region 1, and the second direction X is the same as the width direction of the first region 1. The specific number of the second region 2 and the third region 3 is not limited, and the specific number of the first region 1 is not limited. Preferably, the second region 2 and the third region 3 are both multiple, each second region 2 and each third region 3 are arranged along the second direction X, and the multiple second regions 2 and the multiple third regions 3 are alternately and spacedly arranged along the first direction Y.
[0032] The utility model discloses an embodiment, each second area 2 includes main body area 22, the connecting area 23 of connecting main body area 22 with first area 1, the first isolation area 51 is established between each third area 3 and the main body area 22 of adjacent second area 2, the second isolation area 52 is established between third area 3 and first area 1, the width L1 along second direction X of second isolation area 52 is greater than the width L2 along first direction Y of first isolation area 51, make the spacing between third area 3 and first area 1 greater than the spacing between third area 3 and the main body area 22 of adjacent second area 2, promote the isolation effect between second fine grid 31 and first main grid 1, thereby promote the isolation effect between fine grid and the opposite sex main grid, reduce the risk of electric leakage between fine grid and the opposite sex main grid, improve fine grid and the opposite sex main grid between the anti -electricity -leakage reliability, promote the battery work reliability.
[0033] As an embodiment of the utility model, the third isolation area 53 is established between the third area 3 and the connecting area 23 of adjacent second area 2, and the width L3 of the third isolation area 53 along the first direction Y is greater than the width L2 of the first isolation area 51 along the first direction Y.
[0034] In the embodiment, the third area 3 and the connecting area 23 of adjacent second area 2 are physically isolated by the third isolation area 53. Since the connecting area 23 is arranged close to the first area 1, and the width of the third isolation area 53 along the first direction Y is set to be greater than the width L2 of the first isolation area 51 along the first direction Y, the spacing between the third area 3 and the connecting area 23 of adjacent second area 2 is also greater than the spacing between the third area 3 and the main body area 22 of adjacent second area 2. This can improve the isolation effect between the third area 3 and the connecting area 23 of adjacent second area 2, thereby improving the isolation effect between the first fine grid 21 and the second fine grid 31. At the same time, the isolation effect between the third area 3 and the connecting area 23 of adjacent second area 2 can also be further improved, thereby further reducing the risk of electric leakage between the second fine grid 31 and the first main grid 11.
[0035] The first isolation area 51, the second isolation area 52, and the third isolation area 53 are all isolation grooves, for example, and can all be laser grooves. The first isolation area 51, the second isolation area 52, and the third isolation area 53 are mutually penetrated to form an integrated isolation groove. The utility model divides the isolation groove into the first isolation area 51, the second isolation area 52, and the third isolation area 53 in order to distinguish the isolation groove in different areas.
[0036] As an embodiment of the present application, the first isolation region 51, the second isolation region 52 and the third isolation region 53 are all isolation grooves. The first isolation region 51, the second isolation region 52 and the third isolation region 53 can be square isolation grooves, of course, they can also be isolation grooves of other shapes. If the first isolation region 51, the second isolation region 52 and the third isolation region 53 are of other shapes or irregular shapes, then the width L1 of the second isolation region 52 along the second direction X can be understood as the minimum width of the second isolation region 52 along the second direction X, the width L2 of the first isolation region 51 along the first direction Y is the minimum width of the first isolation region 51 along the first direction Y, and the width of the third isolation region 53 along the first direction Y is the minimum width of the third isolation region 53 along the first direction Y.
[0037] As an embodiment of the present application, the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y is 1.1-2.
[0038] In this embodiment, the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y is 1.1-2, which keeps the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y within a more appropriate range, which can improve the isolation effect of the second fine grid 31 and the first main grid 1, and can avoid excessive widening of the second isolation region 52 to cause the width of the second fine grid 31 to be shortened and affect current collection, thereby achieving a balance between the anti-creeping performance and the current collection performance.
[0039] For example, the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y can be any value in 1.1, 1.12, 1.2, 1.25, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0.
[0040] As an embodiment of the present application, the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y is 1.1-1.5.
[0041] In this embodiment, the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y is further set to 1.1-1.5, which keeps the ratio of the width L1 of the second isolation region 52 along the second direction X to the width L2 of the first isolation region 51 along the first direction Y within a more appropriate range, which can improve the isolation effect of the second fine grid 31 and the first main grid 1, and can ensure a suitable width of the second fine grid 31, maintain good current collection effect, and achieve a better balance between anti-creeping and current collection effect.
[0042] As an embodiment of the present application, the width L1 of the second isolation area 52 along the second direction X is equal to the width L3 of the third isolation area 53 along the first direction Y.
[0043] In the embodiment, the width L1 of the second isolation area 52 along the second direction X is equal to the width L3 of the third isolation area 53 along the first direction Y, which facilitates the processing of the second isolation area 52 and the third isolation area 53, and also facilitates the printing process of the battery.
[0044] As an embodiment of the present application, the width L2 of the first isolation area 51 along the first direction Y is 60-200 microns, and the width L1 of the second isolation area 52 along the second direction X is 66-300 microns.
[0045] In the embodiment, the width L2 of the first isolation area 51 along the first direction Y is 60-200 microns, and the width L1 of the second isolation area 52 along the second direction X is 66-300 microns. Only the width L1 of the second isolation area 52 along the second direction X needs to be greater than the width L2 of the first isolation area 51 along the first direction Y, which can achieve good isolation effect of the first isolation area 51 and the second isolation area 52, and can avoid reducing the areas of the first area 1, the second area 2 and the third area 3 as much as possible to affect the current collection effect.
[0046] For example, the width L2 of the first isolation area 51 along the first direction Y can be any value of 60 microns, 62 microns, 65 microns, 70 microns, 72 microns, 80 microns, 83 microns, 90 microns, 98 microns, 100 microns, 110 microns, 120 microns, 130 microns, 140 microns, 150 microns, 160 microns, 170 microns, 180 microns, 190 microns, 200 microns; and the width of the second isolation area 52 along the first direction Y can be any value of 66 microns, 68 microns, 70 microns, 73 microns, 80 microns, 85 microns, 90 microns, 99 microns, 100 microns, 115 microns, 126 microns, 135 microns, 142 microns, 158 microns, 166 microns, 172 microns, 180 microns, 190 microns, 200 microns, 210 microns, 230 microns, 240 microns, 260 microns, 280 microns, 290 microns, 300 microns.
[0047] As an embodiment of the present application, the width of the connection area 23 along the first direction Y is greater than 100 microns.
[0048] In the embodiment, the width direction of the connecting area 23 of the third region 3 adjacent to the second region 2 is along the first direction Y. The width of the connecting area 23 of the third region 3 adjacent to the second region 2 is greater than 100 microns, which guarantees the sufficient width of the connecting area 23 of the second region 2 and ensures the good current collection effect of the first fine grid 21.
[0049] As another embodiment of the utility model, the width L1 of the second isolation area 52 along the second direction X is greater than the width L3 of the third isolation area 53 along the first direction Y.
[0050] In the embodiment, the width L1 of the second isolation area 52 along the second direction X is set to be greater than the width L3 of the third isolation area 53 along the first direction Y, so that the isolation effect of the third region 3 and the first region 1 is better than the isolation effect between the third region 3 and the connecting area 23 of the adjacent second region 2. The isolation effect of the third region 3 and the first region 1 can be further improved, and the risk of electric leakage of the second fine grid 31 and the first main grid 1 can be further reduced.
[0051] The utility model embodiment further provides a battery assembly, the battery assembly includes the back contact solar cell of above-mentioned embodiment. It needs to be explained that, the battery assembly has the same or similar beneficial effects with the above-mentioned back contact solar cell, and the related parts between the two can be mutually referred to, in order to avoid repetition, here will not be repeated.
[0052] In the embodiment, the plurality of back contact solar cells in the battery assembly can be sequentially connected together to form a battery string, thereby realizing the series connection of the current output. For example, the connection of the battery pieces can be realized by setting a solder strip (bus bar, interconnection strip), a conductive back plate, and the like.
[0053] It can be understood that, in such an embodiment, the battery assembly can further include a metal frame, a back plate, photovoltaic glass, and a film. The film can be filled between the front and back surfaces of the back contact solar cell, the photovoltaic glass, and adjacent battery pieces, and can be a transparent gel with good light transmission and aging resistance, for example, the film can be an EVA film or a POE film, which can be selected according to actual conditions, and is not limited herein.
[0054] The photovoltaic glass can be covered on the film on the front surface of the back contact solar cell. The photovoltaic glass can be super white glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, the light transmittance of the super white glass can be more than 92%, which can protect the back contact solar cell without affecting the efficiency of the back contact solar cell as much as possible. At the same time, the film can bond the photovoltaic glass and the back contact solar cell together, and the presence of the film can seal and insulate the back contact solar cell and prevent water and moisture.
[0055] The back plate can be attached to the adhesive film on the back of the back contact solar cell, and the back plate can protect and support the back contact solar cell, has reliable insulation, water resistance and aging resistance, and the back plate can have multiple choices, which can be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc., which can be set according to specific conditions, and is not limited here. The whole composed of the back plate, the back contact solar cell, the adhesive film and the photovoltaic glass can be arranged on the metal frame, and the metal frame serves as the main external support structure of the entire back contact solar cell module, and can stably support and install the back contact solar cell module, for example, the back contact solar cell module can be installed at the required installation position through the metal frame.
[0056] The utility model embodiment further provides a photovoltaic system, and the photovoltaic system comprises the battery module of the above embodiment. It should be noted that the photovoltaic system has the same or similar beneficial effects as the above-mentioned back contact solar cell, and the relevant parts between the two can be mutually referred to. In order to avoid repetition, this place will not be repeated here.
[0057] In the embodiment, the photovoltaic system can be applied in a photovoltaic power station, such as a ground power station, a roof power station, a water surface power station, etc., and can also be applied in a device or apparatus that utilizes solar energy to generate electricity, such as a user solar power source, a solar street lamp, a solar car, a solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that need to use solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a current combiner box and an inverter, the photovoltaic array can be an array combination of a plurality of back contact solar cell modules, for example, a plurality of back contact solar cell modules can form a plurality of photovoltaic arrays, the photovoltaic arrays are connected to the current combiner box, the current combiner box can combine the current generated by the photovoltaic arrays, the combined current flows through the inverter to convert into alternating current required by the power grid, and then is connected to the power network to realize solar power supply.
[0058] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A back contact solar cell, characterized by, The back contact solar cell comprises: a first region provided with a first main grid, the first region being arranged along a first direction; a second region provided with a first fine grid, the second region being arranged along a second direction and connected with the first region, the first fine grid having the same polarity as the first main grid; a third region provided with a second fine grid, the third region being arranged along the second direction and spaced apart from the first region, the third region being alternately arranged with the second region along the first direction, the second direction intersecting the first direction; the second region comprises a main body region and a connecting region connecting the main body region and the first region, a first isolation region is arranged between the third region and the main body region of the adjacent second region, a second isolation region is arranged between the third region and the first region, the width of the second isolation region along the second direction is greater than the width of the first isolation region along the first direction. a third isolation region is arranged between the third region and the connecting region of the adjacent second region, the width of the third isolation region along the first direction is greater than the width of the first isolation region along the first direction.
2. The back contact solar cell of claim 1, wherein, The ratio of the width of the second isolation region along the second direction to the width of the first isolation region along the first direction is 1.1-2.
3. The back contact solar cell of claim 1, wherein, The ratio of the width of the second isolation region along the second direction to the width of the first isolation region along the first direction is 1.1-1.
5.
4. The back contact solar cell of claim 3, wherein, The width of the second isolation region along the second direction is equal to the width of the third isolation region along the first direction.
5. The back contact solar cell of claim 2, wherein, The width of the second isolation region along the second direction is 60-200 microns, and the width of the first isolation region along the first direction is 66-300 microns.
6. The back contact solar cell of claim 1, wherein, The width of the connecting region along the first direction is greater than 100 microns.
7. The back contact solar cell of claim 1 wherein, The width of the second isolation region along the second direction is greater than the width of the third isolation region along the first direction.
8. The back contact solar cell of claim 2, wherein, The back contact solar cell comprises:
9. A battery assembly characterized by, The battery assembly comprises:
10. A photovoltaic system characterized by,