2601 results about "Battery bank" patented technology

The invention is applicable to the field of photovoltaic technology, and provides a back contact solar cell, which comprises a silicon substrate, non-recessed areas and recessed areas are alternately arranged on the backlight surface of the silicon substrate, and the silicon substrate is provided with extending parts extending and protruding to the upper parts of the recessed areas at the edges of the non-recessed areas and the recessed areas; the first dielectric layer and the first polarity doping layer are sequentially stacked on the non-sunken region and the extension part; the second dielectric layer comprises a first part stacked on the first polarity doping layer and a second part stacked in the sunken region; the second polarity doped layer is stacked on the first portion and the second portion. Under the shielding effect of the extension part, the first polarity doping layer in the non-recessed area is effectively isolated from the second polarity doping layer in the recessed area, and electric leakage is avoided.

The invention provides a device and a method for extracting water from air operated under all working conditions. The device comprises a solar power supply unit, a salt-carrying hydrogel adsorption-desorption unit, an electric heating desorption unit, a water vapor condensation and collection unit and a PID control unit. The solar power supply system comprises a solar photovoltaic panel, an MPPT (maximum power point tracking) type photovoltaic inverter and a storage battery, the salt-carrying hydrogel adsorption-desorption unit comprises hydrophilic porous hydrogel and a LiCl / CaCl2 composite adsorption material, and the electric heating desorption unit comprises a copper heat-conducting plate loaded with the adsorption material and an electric heating sheet. The water vapor condensation and collection unit is composed of four finned radiators and two semiconductor chilling plates. The PID control unit is composed of a temperature and humidity sensor and a control circuit, wherein the temperature and humidity sensor is connected to the radiators and the front side of the adsorption bed. Water vapor in the environment is enriched through an efficient salt-loaded adsorbent packed bed, desorption is driven in two modes of solar photo-thermal and electric heating, desorbed high-humidity airflow passes through a fin type cooling fin connected with a semiconductor and then is condensed into liquid water, and the process of taking water from air is completed through a collector below. According to the device, low-energy-consumption air water taking under the humidity of 15%-100% can be achieved by controlling the operation time of all the units, the device is portable and compact, the automation degree is high, and high-water-yield air water taking is achieved by using solar photo-thermal and power generation as energy input.

The utility model is suitable for the technical field of solar cells, and provides a back contact cell assembly and a photovoltaic system.The back contact cell assembly comprises a cell string, an insulating strip and a bus bar, the cell string comprises a plurality of cell pieces connected in series, the cell pieces are distributed in the first direction, the insulating strip is arranged on the backlight face of the cell pieces in the second direction, the first direction and the second direction intersect, the bus bars are arranged on the sides, away from the battery pieces, of the insulating strips in the second direction, and the insulating strips cover the bus bars. Therefore, the bus bar is hidden in the backlight surfaces of the plurality of battery pieces, and the bus bar cannot be observed from one side of the light receiving surface, so that the overall color of the front surface of the back contact battery assembly is uniform and beautiful. And meanwhile, the insulating strip can be arranged between the bus bar and the battery piece, so that the short circuit problem is avoided.

The invention relates to the technical field of solar cells, and provides a back contact cell assembly and a photovoltaic system.The back contact cell assembly comprises a plurality of cell strings and bus bars, a first welding strip comprises a body section, a bent section and an extending section, and the body section is welded to a first cell piece through a welding spot; the extension section extends between a second welding strip and a fourth welding strip which are adjacent to each other on the second battery piece and is at least partially overlapped with the bus bar so as to be welded with the bus bar, and the body section and the extension section are connected through a bending section; in the thickness direction of the back contact battery assembly, the extension section and the second welding strip do not have an overlapped part, and in the second direction, the distance D between the extension section of at least one first welding strip and the adjacent second welding strip meets the following relational expression: 1 mmlt; d < = 0.63 * arctan (1.8 * L * D2 + H) * (D1-W). Therefore, the hidden crack risk in the lamination process can be reduced, the electrical loss of the assembly can be reduced, the double-sided rate of the assembly can be improved, and the difficulty of the manufacturing process can be reduced.

The invention relates to the technical field of power supply control, in particular to a power supply control system of a photovoltaic energy storage charging pile, which comprises a load power analysis module, an energy storage battery pack management module, a charging and discharging dynamic regulation and control module, an abnormal charging and discharging correction module and a power distribution optimization module. According to the invention, power demand analysis and battery management optimization are carried out. By dynamically analyzing the instantaneous power and fluctuation of the photovoltaic energy storage charging pile, the stability of the load can be more accurately judged, adjustment is carried out according to different fluctuation levels, finer energy allocation is achieved, and by monitoring and adjusting the internal resistance of the battery in real time, abnormal charging and discharging behaviors can be found and corrected in time. According to the invention, safe operation and reliability of energy output are ensured, the utilization rate of photovoltaic power generation can be improved through optimized power distribution, the power supply proportion of the power grid and photovoltaic power generation is dynamically adjusted according to the actual power supply condition, energy waste is effectively reduced, and the economical efficiency and environmental protection property of overall electric energy are improved.

The invention provides a back contact battery assembly and a photovoltaic system, a back contact battery can comprise a plurality of battery strings and a bus bar, a first welding strip comprises a first body section connected with a first battery piece and a first extension section which extends to a second battery piece and is at least partially overlapped with the bus bar, the second welding strip comprises a second body section and a second extension section. And in the thickness direction of the back contact battery assembly, the first extension section and the second extension section do not have an overlapped part. The bus bar is provided with a protruding section protruding towards the side away from the second battery piece at the second extension section, and the bus bar is provided with a recessed section recessed towards the side of the second battery piece at the first extension section. For at least part of the cross section of the bus bar, the included angle alpha between the connecting line between the highest point of the convex section and the lowest point of the adjacent concave section and the plane where the second battery piece is located meets the following formula: 0.075 < = tan alpha < = 3. In this way, the hidden crack risk in the laminating process can be reduced.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell assembly and a photovoltaic system.The solar cell comprises a silicon substrate, the silicon substrate is provided with a backlight face and a light facing face which are oppositely arranged, a plurality of grid lines and a plurality of microarrays are arranged on the backlight face side by side in the first direction, and the grid lines extend in the second direction; the microarray comprises a plurality of arranged microstructure units, an included angle is formed between the microarray and the grid line, and the first direction is crossed with the second direction; the length of the silicon substrate in the second direction is L, the range of the two side edges, parallel to the first direction, of the silicon substrate extending towards the center line by L / 9 is an edge area, the included angle in the edge area is alpha, the included angle in the area close to the position of the center line is beta, and the angle of alpha is larger than that of beta. The absorption path of light in the silicon wafer is increased, the diffuse reflection effect of reflected light of backlight surfaces in different areas is promoted, and therefore the absorption efficiency of the light is improved.

The utility model relates to the field of solar photovoltaic technology, in particular to a battery piece, a battery piece stacking structure and a solar battery assembly. In the battery piece, the plurality of first isolation bulges are arranged on the back surface of the battery piece body, and the first isolation bulges protrude out of the back surface of the battery piece body; the plurality of second isolation bulges are arranged on the front surface of the battery piece body and protrude out of the front surface of the battery piece body; the plurality of grid lines 40 are arranged on at least one surface of the battery piece body; in the thickness direction of the battery piece body, the height of at least one of the first isolation bulges and the second isolation bulges is greater than that of all the grid lines; and the plurality of second isolation bulges are projected on the back surface of the battery piece body, and the projection does not intersect with the first isolation bulges, or the projection partially intersects with the first isolation bulges. The arrangement of the first isolation protrusions and the second isolation protrusions effectively prevents the grid lines from making contact with the front face of the battery piece body.

The invention discloses a wind-solar complementary intelligent charging system and heat management optimization. The system comprises a wind power generation unit, a photovoltaic power generation unit, an energy storage unit, an intelligent control unit and a heat management unit, the wind power generation unit adopts an efficient wind generating set, is provided with an intelligent control system, and can automatically adjust a pitch angle and a yaw angle according to real-time wind speed and wind direction; the photovoltaic power generation unit selects a high-efficiency photovoltaic cell assembly and tracks the position of the sun in real time in combination with an intelligent light following system; and the energy storage unit adopts a high-performance energy storage battery pack and a battery management system. Through accurate prediction and analysis of local wind and light resources, dynamic configuration and cooperative power generation of the wind power generation unit and the photovoltaic power generation unit are realized. Compared with a traditional fixed configuration mode, local wind and light resources can be fully utilized, and the power generation efficiency is improved. Meanwhile, the multi-energy complementary cooperative power generation technology is adopted, organic combination of wind and light power generation and energy storage is achieved, and stable power supply of the system is ensured.

The invention provides a back contact battery assembly and a photovoltaic system, a back contact battery can comprise a plurality of battery strings and a bus bar, each battery string comprises a plurality of battery pieces which are sequentially connected in series along a first direction, and the plurality of battery pieces comprise a first battery piece arranged at the end part of the battery string and a second battery piece adjacent to the first battery piece; the back of the first cell is provided with a first solder strip, and the back of the second cell is provided with a second solder strip. The first welding strip is connected with the first battery piece and is provided with an extension section which extends to the second battery piece and is at least partially overlapped with the bus bar, and the second welding strip comprises a main body section which is not overlapped with the bus bar and an extension section which is overlapped with the bus bar; the main body section extends along the first direction, an extension line of the main body section in the first direction is at least partially overlapped with the first welding strip, the extension section and the main body section are mutually spaced in the second direction, and the extension section and the extension section do not have an overlapped part in the thickness direction of the back contact battery assembly. In this way, the hidden crack risk in the laminating process can be reduced.

The invention provides a back contact battery, a battery assembly and a photovoltaic system. The back contact battery comprises a battery substrate, a plurality of first fine grids and a plurality of second fine grids; the battery substrate comprises a first edge area and a middle area which are sequentially arranged along a first direction; the first fine grids and the second fine grids extend along a second direction, and the second direction is crossed with the first direction; in the middle region, the first fine grids and the second fine grids are alternately arranged along the first direction; in the first edge region, the plurality of first fine grids are sequentially arranged along the first direction; and the second fine grid avoids the first edge region. According to the back contact battery provided by the embodiment of the invention, the second fine grid avoids the first edge region, so that when the back contact battery is applied to the battery assembly, the bus bar can be arranged in the first edge region, the battery assembly does not need to arrange an isolating strip between the bus bar and the back contact battery, and the thickness of the battery assembly can be reduced.

The invention provides a back contact solar cell and a solar cell module, the back contact solar cell comprises a silicon wafer and a grid line structure, and the grid line structure comprises main grid lines and fine grid lines connected with the main grid lines. The grid line structure comprises a plurality of middle grid line sub-structures arranged in the first direction, a first edge grid line sub-structure closest to the first edge and a second edge grid line sub-structure closest to the second edge. The distance between the center line of the main grid line of the first edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of the main grid lines of any two adjacent middle grid line substructures. The distance between the center line of the main grid line of the second edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of any two adjacent middle grid line substructures. The back contact solar cell solves the problem of damage caused by stress concentration at the edge of the cell.

The invention relates to the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system, in the back contact cell, a first collection grid line is interrupted at a first edge serial connection area and is continuous at a second serial connection area, and a first bus grid line is continuous at the first edge serial connection area and the second serial connection area. The first edge bus line is closer to the first edge than the first edge serial connection area, and the first edge bus line is electrically connected with at least part of the first collection grid line and is electrically connected with the first bus grid line. And a first insulating layer is arranged on the part, corresponding to the first serial connection area, of the first bus grid line. The first auxiliary connecting line is arranged in the first edge serial connection area, in the second direction, at least one side of the first bus grid line is provided with the first auxiliary connecting line, and the first auxiliary connecting line is connected with at least two second grid lines located on the same side of the first bus grid line. Therefore, through the arrangement of the first auxiliary connecting line, the influence caused by pseudo soldering can be reduced, so that the efficiency of the back contact battery is ensured.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell module and a photovoltaic system.The solar cell comprises a silicon substrate, and a backlight surface of the silicon substrate is provided with a plurality of grooves; the doped region structures are at least arranged at the plurality of grooves, each doped region structure comprises an internal expansion layer arranged in the silicon substrate, and a passivation layer and a first doped layer which are sequentially arranged on the backlight surface of the silicon substrate, and the passivation layer is provided with a plurality of hole structures; for at least part of the grooves, the number of the hole structures at the corresponding positions of the edges of the grooves is larger than that of the hole structures at the corresponding positions of the middles of the grooves. Holes are reduced in the middle of the groove, the passivation effect is improved, and surface recombination of carriers is reduced; and meanwhile, the holes are additionally formed in the edges of the grooves, so that the carrier transmission capability is improved, and carrier transmission recombination is reduced. Therefore, the photoelectric conversion efficiency and the overall performance of the solar cell are improved together.

The invention relates to the technical field of solar cells, and particularly discloses a back contact solar cell and a preparation method thereof, a cell assembly and a photovoltaic system, the back contact solar cell comprises a silicon substrate, the silicon substrate is provided with a first surface, a second surface and a side surface, the first surface and the second surface are oppositely arranged, and the side surface is respectively connected with the first surface and the second surface; the anti-reflection passivation composite layer comprises a first branch part arranged on the first surface and a second branch part extending from the edge of the first branch part to the outside of the side surface; the anti-reflection passivation composite layer comprises an ultrathin silicon oxide layer, an aluminum oxide layer, a silicon nitride layer, a silicon oxynitride layer and a silicon oxide layer which are sequentially arranged in the direction away from the silicon substrate, and the refractive indexes of the silicon nitride layer, the silicon oxynitride layer and the silicon oxide layer are sequentially decreased. Influences brought by defects on the side face of the silicon substrate can be effectively solved, parasitic absorption on the edge of the cell can be reduced, the anti-reflection and passivation effects of the anti-reflection and passivation composite layer can be effectively improved through mutual cooperation of the multiple material layers, the stress problem can be improved, the conversion efficiency of the cell can be integrally and effectively improved, and the service life of the cell can be prolonged. And the long-term reliability of the battery is ensured.

The invention is suitable for the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system. The back contact cell comprises a silicon substrate, a plurality of first polarity fine grids and a plurality of second polarity fine grids. The first polarity fine grid and the second polarity fine grid are arranged on the silicon substrate along a first direction, and the first polarity fine grid and the second polarity fine grid are spaced; the first polarity fine grid comprises a first grid line, the first grid line is provided with a first connecting block, the width of the first connecting block is larger than that of the first grid line, and the length of the first connecting block is larger than or equal to 100 micrometers; the second polarity fine grid comprises a second grid line, the second grid line comprises a first main body part and a first bending part which are connected, the first main body part extends along a second direction, the second direction is crossed with the first direction, and the first bending part is arranged corresponding to the first connecting block and is bent from the first main body part to the direction far away from the first connecting block. Therefore, the connection stability of the back contact battery and the electric connecting piece can be improved.

The utility model is suitable for the technical field of solar cells, and provides a back contact cell, a cell string, a cell assembly and a photovoltaic system.The back contact cell comprises a silicon substrate, a first doping layer, a first insulating layer, a second doping layer and a conductive contact structure, and a first groove and a protruding part which are arranged in the first direction are formed on the back face of the back contact cell; the first doped layer is arranged on the convex part in a stacked mode, the second doped layer is arranged in the first groove in a stacked mode, the second doped layer comprises a first sub-doped layer and a second sub-doped layer which are arranged in a stacked mode, the polarity of the second doped layer is opposite to that of the first doped layer, and the conductive contact structure comprises an extending part. The thickness of the extending part in the thickness direction is larger than that of the convex part, the first doping layer and the first insulating layer. Therefore, the conductive contact structure can be used as a heat dissipation point, and the influence of hot spots is reduced or even eliminated. In addition, the first doping sub-layer and the second doping sub-layer are connected with the extending part, so that the contact area is increased, the conductive efficiency is improved, a plurality of electric leakage points are formed, and the safety is further improved.

The invention belongs to the technical field of photovoltaic energy storage, and discloses a livestock farm photovoltaic power generation and energy storage combined control system and method, and the method comprises the steps that a converter group converts direct current generated by a photovoltaic cell panel group into voltage and current suitable for a storage battery group and a supercapacitor group; the data analysis module monitors the running state of the system in real time through a data analysis algorithm; the super capacitor bank is responsible for providing instantaneous power support; the inverter converts the direct current into alternating current; the power grid connection mechanism merges electric energy generated by the photovoltaic power generation system into a power grid, charging or discharging management is performed on the storage battery pack according to actual needs, the control mechanism is combined to monitor the system operation state in real time, and the control strategy module sets an operation strategy according to the actual needs. The running state of the system is monitored in real time through the combined control mechanism, working parameters of all assemblies are adjusted, and stable running of the system and efficient utilization of solar energy resources are ensured; the system can intelligently control the charging and discharging process and the grid connection process.

The invention relates to the technical field of emergency power supply, and provides an emergency power supply method and system for a household energy storage power supply. And performing dynamic health assessment through the multi-dimensional state matrix of the target battery pack to obtain an SOH value and an SOC value of the target battery pack, and performing dynamic energy distribution according to the SOH value, the SOC value and a load demand to obtain a multi-target charging and discharging optimization strategy. Inverter output waveform synthesis and dynamic harmonic compensation are carried out according to a multi-target charging and discharging optimization strategy to generate pure sine wave alternating current, and a battery state, power grid power failure risk and photovoltaic power generation amount prediction and adjustment time-sharing energy storage dynamic adjustment instruction is carried out in combination with environment prediction information; and performing multi-energy input cooperative control distribution according to the time-sharing energy storage dynamic adjustment instruction and the real-time energy input state to generate a multi-source power distribution instruction. According to the invention, the safety, reliability and economy of the household energy storage system in the sudden power failure scene are improved through the combination of the technologies of risk prediction, cooperative control and the like.

The invention relates to the technical field of solar cell module packaging, in particular to a packaging structure for a perovskite-back contact crystalline silicon laminated solar cell and a preparation method of the packaging structure. The packaging structure comprises a front light conversion glass layer, a perovskite top cell layer, an infrared light-transmitting adhesive film layer, a back contact crystal silicon bottom cell layer, an adhesive film layer and a packaging bottom plate which are arranged in sequence, and butyl rubber surrounding the perovskite top cell layer, the infrared light-transmitting adhesive film layer, the back contact crystal silicon bottom cell layer and the adhesive film layer is arranged between the front light conversion glass layer and the packaging bottom plate, and the near infrared transmittance of 780 nm to 1100 nm in the infrared transparent adhesive film layer is 93% to 100%. According to the packaging structure based on the front light conversion glass layer and the infrared light-transmitting adhesive film layer, regulation and control of short-wave ultraviolet and near-infrared spectrums are considered, and the photoelectric property and reliability of the perovskite-crystalline silicon four-terminal laminated device are remarkably improved.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell module and a photovoltaic system.The solar cell comprises a silicon substrate and an electrode arranged on the silicon substrate, and the electrode comprises a bus grid line; the silicon substrate comprises a doping layer; the bus grid line comprises a connecting conductor and a fine grid line; the connecting conductors extend along a first direction, and the fine grid lines are arranged on the surfaces, facing the silicon substrate, of the connecting conductors; the connecting conductor is in non-physical contact with the doping layer, and the fine grid line is in physical contact with the doping layer. The fine grid lines collect current carriers generated by the silicon substrate, current carrier loss caused by shielding of the connecting conductors is reduced, the connecting conductors are used for transmitting the collected current carriers, and the transmission efficiency is high.

The embodiment of the invention discloses an etching method, an etching device and a solar cell module. The etching method comprises the following steps: controlling a light spot overlapping rate to be smaller than a preset overlapping rate; generating laser with preset performance parameters; shaping the laser into rectangular flat-topped light; and focusing the rectangular flat-topped light into a light spot with a preset size, and etching the perovskite functional layer in the to-be-etched cell according to the light spot overlapping rate. According to the technical scheme provided by the embodiment of the invention, the etching method is set, the perovskite functional layer is etched by adopting point contact, the laser beam adopts rectangular flat-topped light, each pulse independently acts on the film layer, single-pulse etching is performed on the perovskite functional layer in the to-be-etched cell, heat accumulation in an optical pulse overlapping region is avoided, and electrode deposition is more facilitated.

The embodiment of the invention provides a perovskite solar cell, a preparation method thereof and a perovskite solar cell module. The perovskite solar cell comprises a substrate and a transparent conductive oxide layer, wherein the transparent conductive oxide layer is provided with a plurality of first regions and second regions which are arranged in a staggered manner; a first etching groove is formed in the transparent conductive oxide layer in the first region; the insulating protection layer is positioned in the first region; the first charge transport layer, the perovskite light absorption layer and the second charge transport layer are located in the second region; the second etching groove is positioned in the insulating protection layer; the electrode layer is positioned on the second charge transmission layer and the insulation protection layer and in the second etching groove; and the third etching groove is positioned in the electrode layer of the first region. According to the technical scheme of the invention, the insulation protection layer in the perovskite solar cell can protect the perovskite light absorption layer, reduces the damage of laser scribing to the perovskite light absorption layer, and improves the stability of a perovskite solar cell module.

The invention relates to a back contact photovoltaic cell piece, a back contact photovoltaic cell assembly and a preparation method, and relates to the technical field of photovoltaic cell pieces. According to the preparation method, at least part of the structure of the surface of the silicon substrate is subjected to at least two times of texturing treatment to form a textured surface, in the two adjacent times of texturing treatment, the concentration of a texturing solution used in the later texturing treatment is smaller than that of a texturing solution used in the previous texturing treatment, the substrate is dried by ozone, and the textured surface is formed. And at least forming a silicon oxide passivation layer on the textured surface. Through at least two times of texturing treatment, the average size of the pyramid structure of the formed textured surface is relatively small, the density of the pyramid structure of the textured surface is relatively large, and the distribution uniformity degree of the pyramid structure of the textured surface is relatively large. The back contact photovoltaic cell prepared according to the preparation method has the advantages of relatively low light reflectivity and relatively low recombination rate, so that the prepared back contact photovoltaic cell can have relatively high photoelectric conversion efficiency.

The invention is suitable for the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system. The back contact battery comprises a silicon substrate and a plurality of fine grids arranged on the silicon substrate, the plurality of fine grids extend along a first direction and are arranged at intervals along a second direction, and the silicon substrate is provided with a first edge in the second direction; the silicon substrate comprises a first edge region, and the first edge region is an edge region close to the first edge; at least one fine grid located in the first edge area comprises a bent part, the maximum distance between the bent part and the first edge is larger than the distance between the fine grid and the first edge, and the bent part is located in the area, electrically connected with the welding strip, of the fine grid. According to the back contact battery, the battery assembly and the photovoltaic system provided by the invention, the welding tension of the fine grids in the first edge region can be improved, the current collection effect can also be improved, and the power generation efficiency of the battery is further improved.

The invention relates to the technical field of solar cells, and provides a back contact solar cell, a cell assembly and a photovoltaic system.In the back contact solar cell, first doping structures and second doping structures are alternately arranged in the first direction, each first doping structure comprises a plurality of first doping parts arranged at intervals in the second direction, and each second doping structure comprises a plurality of second doping parts arranged at intervals in the second direction. The first doping structure comprises a plurality of first doping parts which are arranged at intervals in the second direction, a first gap is formed between every two adjacent first doping parts, the second doping structure comprises a plurality of second doping parts which are arranged at intervals in the second direction, and a second gap is formed between every two adjacent second doping parts. Therefore, parasitic absorption of the back surface can be reduced, the double-sided rate of the back contact solar cell is improved, metallization recombination can be effectively reduced, and the efficiency of the back contact solar cell is improved.

The invention relates to the technical field of solar cells, and provides a back contact cell assembly and a photovoltaic system.The back contact cell assembly comprises a plurality of cell string units, and back contact cell pieces, covered with insulating strips and bus bars, in cell strings of the cell string units are first cell pieces; and the back contact battery piece which is not covered with the insulating strip and the bus bar is a second battery piece. And the length W of the first battery piece in the first direction meets the following relational expression: W is greater than or equal to W0 + D1 + (1-a%) * (D2-D1). Therefore, on one hand, the insulating strip and the bus bar are arranged on the back surface of the back contact battery piece of the battery string, so that the effective light receiving area of the assembly can be increased, and the attractiveness of the assembly is improved. And on the other hand, the size of the first battery piece covered with the insulating strip and the bus bar is specially designed, and the size of the first battery piece covered with the insulating strip and the bus bar in the first direction is correspondingly increased, so that the double-sided rate of the module can be improved, and the power of the module can be ensured.

The invention is applicable to the field of photovoltaic technology, and provides a photovoltaic cell, a cell assembly and a photovoltaic system, the photovoltaic cell comprises a first area and a second area, the first area and the second area are adjacently arranged, and the absolute value of the difference value of the reflectivity of the first area and the reflectivity of the second area is greater than 0.05%. Due to the fact that the contrast of the first area and the contrast of the second area are different due to the difference of the reflectivity, the first area and the second area can be accurately distinguished, and the identification degree of identification of the two areas is increased.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell module and a photovoltaic system, the solar cell module comprises a first cell string, a first solder strip, a second solder strip, a bus bar and an insulating layer; the first battery string comprises a plurality of back contact battery pieces which are connected in series, and the back contact battery pieces comprise end battery pieces; a plurality of first welding strips and second welding strips are alternately arranged on the end battery piece in the first direction, the first welding strips and the second welding strips extend in the second direction, one end, close to the edge of the first battery string of the end battery piece, of each second welding strip extends to form a turnover section, and the turnover sections are turned over towards the end battery piece; the insulating layer and the bus bar are arranged in a stacked mode, extend in the first direction and are arranged between the second welding strip and the turnover section, the insulating layer makes contact with the second welding strip, and the bus bar makes contact with the turnover section. Therefore, welding personnel or equipment can accurately control welding, the welding quality is improved, meanwhile, thermal damage or subfissure to the back contact battery piece is avoided, and the service life and the stability of a product are guaranteed.

The invention discloses an intelligent energy storage method and system for a photovoltaic power station, and relates to the technical field of intelligent energy storage, and the method comprises the steps: collecting meteorological data, photovoltaic power station and geographic information data to construct a fusion data set, importing a photovoltaic prediction model, and outputting a photovoltaic prediction power sequence; the method comprises the following steps: acquiring time-of-use electricity price from a power transaction platform, receiving a power fluctuation limit value issued by a scheduling system, acquiring a charge state of a battery pack, namely an energy storage SOC state in real time, adopting a rolling time domain optimization solution model, solving a dual-target model, and outputting an optimal charge and discharge power instruction sequence; the energy storage unit submits an acceptable power range and a unit power quotation; a market clearing algorithm is executed; the quotation of the subject matter and the quotation of the energy storage unit are summarized; and after priority sorting according to prices and accumulative matching, issuing instructions are distributed according to a bid winning proportion, and the issuing instructions are distributed to the physical energy storage unit. And the whole life cycle cost minimization is realized.