37results about How to "Reduce package loss" patented technology

The invention provides an IBC (Interdigitated back contact) solar cell and a preparation method of the same, and belongs to the solar cell field. The IBC solar cell is characterized in that an ICB cell is equally divided into even number of same cell units through laser scribing lines, and the adjacent cell units are insulated from each other; printing of insulated slurry is performed along the solder strip connection positions, so as to enable a plurality of solder strips to connect P type metalized grid lines and N type metalized grid lines in the horizontal direction successively at intervals; and each of the plurality of solder strips is connected with the anode and the cathode of the adjacent cell units in the vertical direction, so that one continuous solder strip can connect each cell unit in series. Therefore, for the IBC solar cell, on the premise of not changing the cells, the assembly equipment and the technology, the effect of improving open-circuit voltage and reducing short circuit current can be obtained, so that during the assembly packaging process, the open-circuit voltage can be increased and the short circuit current can be reduced, and then the packaging loss caused by the current and the resistance can be reduced.

The present application relates to a cell string formed by spliced N-type IBC solar cells and a preparation method thereof, a solar cell module, and a solar cell system. The cell string comprises narrow N-type IBC solar cells and a conducting member configured to realize Ohmic connection between the narrow N-type IBC solar cells, with emitter p+ regions and base n+ regions being alternately arranged on a back surface of each of the narrow N-type IBC solar cells, p+ emitter contact electrodes being arranged in the emitter p+ regions, n+ base contact electrodes being arranged in the base n+ regions, further comprising p+ electrode current convergence points arranged on the p+ emitter contact electrodes and n+ electrode current convergence points arranged on the n+ base contact electrodes, with an insulating barrier layer being arranged around the current convergence points, and the conducting member being arranged between the adjacent narrow N-type IBC cells. The present application has the following beneficial effect. In the present application, a cell string formed by spliced N-type IBC solar cells is realized by the use of an insulating barrier layer and a conducting member. Since the gap between the cells may be controlled to be less than 0.2 mm, the power of the solar cell module will be far higher when compared with the conventional connection methods for cell strings. In addition, the manufacturing process of the solar cell module is simple and less costly.

The invention belongs to the technical field of solar photovoltaic. A novel crystalline silicon dual-glass photovoltaic curtain wall light transmitting assembly comprises front glass and back glass, wherein power generation regions and a light transmitting region are arranged between the front glass and the back glass at interval, each power generation region comprises a battery pack and package layers, and the package layers are arranged on the two surfaces of the battery pack. The novel crystalline silicon dual-glass photovoltaic curtain wall light transmitting assembly has the advantages that the assembly conforms to a human body structure, battery pieces are arranged in a concentrated way, the arrangement mode of the battery pieces is changed, and such design is used for improving the transmittance and also improving power generation efficiency; and moreover, with the dual-glass photovoltaic curtain wall light transmitting assembly, the length of an inter-connection strip is reduced, the cost is saved, the space is reasonably utilized, the transmittance is improved, favorable lighting and view are achieved in the indoors, and meanwhile, the package loss is reduced.

The invention discloses a method for minimizing package loss of a photovoltaic module, and discloses a method for minimizing package loss of a solar cell module. The method comprises the following specific steps: (1) fabricating photovoltaic glass with different antireflection film thicknesses, and building a relationship scale of the antireflection film thickness and the transmittance; (2) measuring the quantum efficiency of a tested solar cell through a photocell quantum efficiency testing equipment to obtain spectral response distribution of the tested solar cell; (3) calculating the light utilization rate of the solar cell in the spectral condition in a traversable manner according to the spectral response distribution of the tested solar cell and the transmittances of thick coated glass with various antireflection film thicknesses; and (4) comparing the light utilization rates under the condition of different antireflection film thicknesses to obtain a theoretic optimization value of the package loss caused by an optical loss. According to the method, the light utilization rate difference between the different antireflection film thicknesses is fitted out, so that the antireflection film thickness scheme with the minimum package loss caused by the optical loss is obtained.

The invention discloses a photovoltaic cell assembly with two glass layers. The assembly comprises a body, a reflective coating, an end sealing block and a frame, wherein the body comprises the first glass layer, a first encapsulating layer, a cell assembly layer, a second encapsulation layer and the second glass layer, the first glass layer, the first encapsulating layer, the cell assembly layer, the second encapsulation layer and the second glass layer are sequentially stacked, and the outer edge of the first glass layer and the outer edge of the second glass layer are higher than the outer edge of the first encapsulation layer, the outer edge of the cell assembly layer and the outer edge of the second encapsulation layer; the reflective coating is arranged on the second glass layer; the end sealing block is disposed between the first glass layer and the second glass layer and located on the periphery of the first encapsulation layer or the cell assembly layer or the second encapsulation layer; the frame is disposed on the outer periphery of the body. According to the photovoltaic cell assembly, by means of the end sealing block, the defect that a traditional encapsulation material is exposed outside is overcome, moisture and corrosive gas can be prevented from entering the assembly, and the service life of the assembly is prolonged; the reflective coating can reflect light penetrating through a gap of a cell to reduce encapsulation loss, and the frame can effectively protect the cell assembly.

The invention discloses an ammonium sulfate crystallization method and a device thereof, which belong to the field of chemical industry. The device uses two crystallizers in series and adopts a two-effect vacuum crystallization process, the first effect is neutralization crystallization, and the second effect is evaporation crystallization. The first effect is to neutralize the slurry produced by the crystallization with a large proportion of fine crystal particles, and the second effect is an evaporation crystallization system to obtain ammonium sulfate with a large proportion of large-grained ammonium sulfate. The device makes full use of the heat of gas ammonia dissolution and the neutralization heat of the neutralization reaction between sulfuric acid and ammonia, and uses the secondary steam of the neutralization crystallizer as a heat source to reduce the consumption of circulating water, increase the proportion of large-grained ammonium sulfate, and reduce the production of caprolactam at the same time. Package loss.

The invention relates to a preparation method for high open-circuit voltage polycrystalline solar cells. A temperature-variable deposition high-temperature knot pushing technology is adopted in the diffusion process, and the dense grid design of 90 fine grids is adopted by positive pole printing patterns during the positive-pole printing process. The temperature-variable deposition is the process of increasing the temperature to 860 DEG C, temperature-variable deposition for 10 min is conducted on a silicon wafer during the temperature-increasing process, the mixture gas of large N2, O2 and small N2 is led in, and the proportion, by volume, of the small N2 is 7%; the high-temperature knotting pushing process is that the temperature is kept at 860 DEG C stably, the small N2 is stopped being led in, the large N2 and the O2 are led in for impurity re-distribution, the time is controlled to be within 17 min, and the proportion, by volume, of the O2 is 15%. The preparation method enables the square resistance of the silicon wafer to be from 90omega / sq to 95omega / sq, and compared with one-time constant-temperature deposition diffusion, the polycrystalline solar cells produced under the situation that the cost is not increased can obtain the higher open-circuit voltage.

The invention relates to a novel test and grading method for a crystal silicon solar cell, which is a method for optimally using grades at a working current and grading battery pieces of the same working current grade again through battery efficiency. Flexible grading intervals are set with regard to different situations during grading the battery pieces, different grading intervals are used according to different parameter states of different batches of battery pieces, the difference between the maximum working current and the minimum working current is greatly reduced, the discrete degree is integrated, the matching of the working currents of battery pieces of the whole module unit is achieved, the package loss of the whole module is reduced, meanwhile, the light and shade phenomenon of module E1 test can be also corresponding improved, the yield from batteries to modules is improved, and the primary finished rate of assembly fabrication is improved.