2166 results about "Battery bank" patented technology

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 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 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 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 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 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.

The invention relates to a photovoltaic cell preparation method, a photovoltaic cell, a laminated cell and a photovoltaic cell module. Providing an initial battery piece; depositing and forming a protective layer on the surface; carrying out laser treatment twice; printing and sintering to form an electrode; and carrying out at least two times of laser-assisted sintering on the electrode. According to the photovoltaic cell preparation method, the protection layer at the first area is removed, the doping concentration at the first area is improved, and at least two times of laser-assisted sintering are combined, so that on one hand, the metal contact area is optimized, the usage amount of silver paste is reduced, the material cost is reduced, and meanwhile, paste contact sintering is enhanced; damage caused by laser grooving doping is removed; and on the other hand, the doping concentration is optimized, the contact resistance is remarkably reduced, the open-circuit voltage and the filling factor are favorably improved, the shading loss is reduced, and the current collection efficiency is ensured, so that the photoelectric conversion efficiency and the reliability of the cell are remarkably improved, the production process is simplified, and the production cost is reduced.

The utility model is suitable for the field of photovoltaic technology, and provides a back contact battery assembly and a photovoltaic system, and the back contact battery assembly comprises a battery string which at least comprises a first battery piece and a second battery piece which are sequentially arranged along a first direction, the first battery piece is arranged at the end part of the battery string, and the second battery piece is arranged at the end part of the battery string. The first welding strip is arranged on the backlight surface of the first battery piece; the second welding strip is arranged on the backlight surface of the second battery piece; the first bus bar is arranged on the backlight face of the second battery piece, the first bus bar can be arranged on the backlight face of the battery piece in a hidden mode, the effective light receiving area of the battery assembly can be increased, the conversion efficiency of the assembly can be improved, and the overall attractiveness of the battery assembly is better; moreover, the first bus bar is arranged on the second battery piece, so that the first welding strip can be ensured to be fully attached to and welded to the effective welding position of the first battery piece.

The invention relates to a method for regulating and controlling crystallization of a perovskite thin film based on surface laser annealing and a preparation method of a perovskite photovoltaic module, and the surface laser annealing comprises the steps: constructing an infrared temperature measurement system in annealing equipment to monitor the surface temperature of the perovskite thin film in real time, and carrying out the closed-loop control of the output power of a surface laser; in annealing equipment, a preheating stage and a main annealing stage are executed through a surface laser, and optionally, a post-processing stage can be further added to prepare the perovskite thin film. Compared with the traditional heating stage annealing and line scanning laser annealing process, the method has the advantages that surface laser annealing is more uniform, local instantaneous heating is realized through high-energy dense surface laser within millisecond-second time, a solvent can be rapidly evaporated through rapid temperature rise, synchronous crystallization of a perovskite precursor is promoted, an independent precipitation time window of PbI2 is reduced, and the yield of PbI2 is improved. Therefore, the performance of the device is improved, and the high-efficiency perovskite solar cell module can be prepared.

The invention relates to a large-scale air water trapping system based on MOFs, which comprises an electric power storage assembly, a solar cell assembly and an MOFs air water trapping assembly, and is characterized in that the solar cell assembly comprises a solar cell panel and a liquid cooling pipeline; the solar cell panel and the electric power storage assembly are electrically connected with all electric appliances of the system. The MOFs air water trapping assembly comprises: an air suction module; the MOFs water adsorption and desorption module is communicated with the air suction module; the heat exchange module comprises a liquid heat pipeline which is communicated with the liquid cooling pipeline to form a liquid circulation loop and is in heat exchange connection with the MOFs water adsorption and desorption module, and heat exchange liquid is arranged in the liquid circulation loop; the condensation module is communicated with the MOFs water adsorption and desorption module; the circulation module is communicated with the MOFs water adsorption and desorption module and the condensation module to form a gas circulation loop; the water storage module is communicated with the condensation module; the control module is in communication connection with the air suction module, the heat exchange module, the condensation module and the circulation module.

A back-contact solar cell, a battery assembly and a photovoltaic system. In the back-contact solar cell, several grooves arranged at intervals are formed in a back surface of a silicon wafer, so as to divide the back surface of the silicon wafer into several first regions and second regions that are alternately arranged in sequence, in an arrangement direction of the first regions and the second regions, the silicon wafer is provided on the first regions and the edges of the grooves with extension portions that extrude to the upper side of the grooves, and second polarity doping layers are disposed on second tunneling layers in a stacked manner and have a preset distance with the edges of the grooves.

The invention is suitable for the technical field of solar cells, and provides a solar cell and a manufacturing method thereof, a cell module and a photovoltaic system. The solar cell includes: a silicon substrate including a doped layer; the fine grids are arranged on the silicon substrate and are electrically connected with the doping layer; the passivation layer comprises a first passivation part and a second passivation part, the first passivation part at least partially covers the area, exposed from the fine grid, of the silicon substrate, and the second passivation part at least partially covers the fine grid. Therefore, the first passivation part of the passivation layer at least partially covers the part, exposed from the fine grid, of the silicon substrate, and the second passivation part at least partially covers the fine grid, so that the fine grid is at least partially covered by the passivation layer, oxygen, water vapor and pollutants can be isolated, and the risk that the fine grid is oxidized or corroded is reduced. Moreover, the second passivation part can provide insulation for the fine grid covered by the second passivation part, and the risk that the surface, covered by the second passivation part, of the fine grid is conducted with a structure with non-corresponding polarity is reduced.

The utility model is suitable for the field of photovoltaic technology, and provides an electrode structure of a back contact cell, a cell piece and a solar cell module, and the electrode structure comprises a main grid which is closest to a first edge of the back contact cell; the first connection grid line is connected with the main grid, the pad point and the main grid are arranged at intervals in the first direction, the first end of the second connection grid line is in electric contact with the pad point, the second end of the second connection grid line extends in the second direction, and the first direction intersects with the second direction. When the welding strip is arranged on the battery piece and connected with the pad point, the welding strip extends to the second connecting grid line, so that burrs on the edge of the welding strip are blocked by the second connecting grid line, the burrs on the edge of the welding strip are prevented from directly puncturing the insulating paste to be communicated with the opposite grid line, and the second connecting grid line plays a role in protecting the battery piece. The risk of local short circuit of the battery piece is avoided, and the yield of the battery piece can be effectively improved.

The invention discloses a water-based soldering flux for a photovoltaic N-type battery 0BB assembly and a preparation method of the water-based soldering flux, and belongs to the technical field of soldering flux. The soldering flux is prepared from the following raw materials in parts by weight: 30-60 parts of deionized water, 30-50 parts of an alcohol solvent, 2-8 parts of a high-boiling-point solvent, 1-4 parts of organic acid, 0.1-1 part of a surfactant, 0.1-1 part of an antioxidant, 0.1-1 part of a corrosion inhibitor, 0-1 part of psicose and 0-1 part of trimethylolpropane tricaprylate. According to the invention, the problem of negative influence on tension of thermosetting adhesive and alloying of a fine grid when a traditional soldering flux is applied to a photovoltaic N-type battery 0BB assembly is solved.

The invention relates to the technical field of solar cells, and particularly discloses a solar cell module and a photovoltaic system, and the solar cell module comprises a cell string which comprises an edge cell string; the edge confluence piece and the edge battery string are arranged on the edge of the same side of the battery assembly in the second direction, and the edge confluence piece is arranged in an extending mode in the second direction; the edge confluence welding strip is used for electrically connecting the edge battery string and the edge confluence piece, the edge confluence welding strip comprises a main body section and a bent section, the main body section is arranged in an extending mode in the first direction, and the bent section is arranged on the side, close to the edge confluence piece, of the main body section and on battery pieces in the edge battery string; one end close to the edge of the corresponding side of the battery assembly in the second direction is an edge end, and the bent section is bent in the direction far away from the edge end in the second direction. The hidden crack risk of the edge area of the battery assembly can be effectively reduced, the packaging effect is improved, and then the production yield and the long-term reliability of the battery assembly are improved.

A back contact solar cell, a preparation method and a battery assembly, which belong to the technical field of crystalline silicon solar cells. The back contact solar cell comprises: a semiconductor substrate, the back surface of which includes first polarity regions and second polarity regions alternately arranged in a first direction; a first functional layer, which is disposed in the first polarity regions; a second functional layer, which is disposed in the second polarity regions; a laser protection layer, which is disposed on the side of the second functional layer away from the semiconductor substrate and exposes electrode contact regions of the second functional layer, wherein the material of the laser protection layer includes laser absorption material; first electrode structures, which are disposed on the side of the first functional layer away from the semiconductor substrate; and second electrode structures, which are disposed on the side of the second functional layer away from the semiconductor substrate and located in the electrode contact regions.

The utility model discloses a solar cell sheet, a cell assembly and a photovoltaic system, and the solar cell sheet comprises a cell substrate which is provided with a first edge and a second edge in a first direction; the grid line structure is arranged on the back face of the battery substrate, and the grid line structure comprises first grid lines and second grid lines which are alternately arranged in the second direction; the Pad points comprise first Pad points and second Pad points, the first Pad points and the second Pad points are alternately arranged in the first direction, the first Pad points are electrically connected with the first grid lines, and the second Pad points are electrically connected with the second grid lines; discontinuous regions are formed between the first Pad point and the first grid line and between the first Pad point and the second grid line, and between the second Pad point and the first grid line and between the second Pad point and the second grid line; and the marking structure comprises at least one Mark point, and the Mark point is arranged in the discontinuous region closest to the first edge and / or the second edge. By adopting the solar cell provided by the utility model, the printing quality and the grabbing stability of the marking structure can be improved, so that the production efficiency of the solar cell is improved.

The invention discloses a solar cell module, a preparation method, electric equipment and power generation equipment, the solar cell module comprises a hole transport layer, a light absorption layer and a passivation layer, the hole transport layer comprises a first hole transport layer and a second hole transport layer, and the second hole transport layer is provided with a plurality of pores; the surface, close to the second hole transport layer, of the passivation layer is at least partially embedded in the pores of the second hole transport layer, and the surface, away from the second hole transport layer, of the passivation layer is uneven. According to the embodiment of the invention, good hole transport efficiency is provided through the first hole transport layer; the contact area between the second hole transport layer and the light absorption layer is increased through the second hole transport layer with a plurality of pores, and the hole extraction rate is improved; the hole transmission efficiency is improved through the passivation layer; the hole transport layer and the passivation layer are cooperatively used, so that the device performance of the corresponding solar cell module is improved.

The invention is applicable to the field of photovoltaic technology, and provides a battery piece, a battery assembly and a photovoltaic system, and the battery piece comprises a substrate which is provided with a first surface and a second surface which are oppositely arranged; the first thin grids and the second thin grids are arranged on the first surface, the polarities of the first thin grids and the polarities of the second thin grids are opposite, and the first thin grids and the second thin grids extend in the first direction and are arranged at intervals in the second direction. The winding plating structure can be used for conducting contact with the bus grid lines on the back faces of the adjacent battery pieces, a welding strip is not needed, carriers are in direct contact with the bus grid lines through the winding plating structure to form cross-battery transmission, and the transmission distance of the carriers is shortened.

The invention is suitable for the photovoltaic technical field, and provides a photovoltaic cell, a cell assembly and a photovoltaic system, the photovoltaic cell comprises a semiconductor substrate, a first polarity doping layer and a second polarity doping layer; the back surface of the semiconductor substrate comprises a plurality of doped regions, the doped regions comprise first regions and second regions, the first regions and the second regions are alternately arranged, the first regions and the second regions are connected through connecting regions, first polarity doped layers are stacked on the first regions, and second polarity doped layers are stacked on the second regions; the first polarity doping layer and the second polarity doping layer in at least part of the connection area are in composite contact to form a composite contact area; the absolute value of the difference between the reflectivity of the connection region and the reflectivity of the doped region is greater than 0.05%. Connection areas form composite contact, the problem of hot spots is solved, meanwhile, damage to the battery piece caused by additional machining is avoided, the production cost can be reduced, and meanwhile the recognition accuracy and efficiency of a machine vision system on the photovoltaic battery can be guaranteed.

The utility model relates to the technical field of solar cells, and discloses a back contact type solar cell and a solar cell module, the back contact type solar cell comprises an N-type doped polycrystalline silicon layer and a P-type doped polycrystalline silicon layer which are arranged on a tunneling layer, and the N-type doped polycrystalline silicon layer and the P-type doped polycrystalline silicon layer are insulated and isolated through an isolation region; the first interface passivation layer covers the N-type doped polycrystalline silicon layer, the P-type doped polycrystalline silicon layer and the isolation region; the first surface passivation layer is arranged on the first interface passivation layer; the first antireflection layer is arranged on the first surface passivation layer; the first electrode and the second electrode are arranged on the back face of the substrate, the first electrode penetrates through the interface passivation layer to be in contact with the N-type doped polycrystalline silicon layer, and the second electrode penetrates through the interface passivation layer to be in contact with the P-type doped polycrystalline silicon layer. According to the utility model, the sintering temperature is effectively reduced, the sintering time is shortened, the cost is reduced, the possibility of membrane explosion on the back surface is reduced, and the efficiency attenuation is slowed down.

In the field of photovoltaic power generation, a solar cell and a solar cell module capable of improving photoelectric conversion efficiency are provided. [Solution] The solar cell has a first surface and a second surface arranged back to back, and the first surface has first and second regions arranged alternately, and the second region includes a substrate having a groove formed in it relative to the first region, a passivation contact structure located in the first region, a passivation layer covering the surface of the passivation contact structure and the inner wall surface of the groove, and a first electrode located on the passivation layer and electrically connected to the passivation contact structure, and the side of the groove or the side of the passivation contact structure has a recess that is recessed inward along a first direction that is the direction from the second region to the first region, and the recess includes a continuous first side surface and a second side surface, the first side surface is connected to the first region, and the angle between the first side surface and the second side surface is a first obtuse angle.

The invention relates to the technical field of solar cells, and particularly discloses a back contact cell, a cell assembly and a photovoltaic system, the cell comprises a substrate, the 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 doping layer is arranged on the second surface; the TCO layer comprises a main body part and a micro electric leakage channel part, the main body part is arranged on one side, opposite to the substrate, of the doping layer, the micro electric leakage channel part extends to the outer side of the side surface from at least part of the edge of the main body part along a first direction, and the first direction is a direction from the second surface to the first surface. According to the back contact battery, the hot spot effect can be reduced, the local overheating phenomenon caused by charge accumulation is avoided, and the overall reliability and safety of the battery are improved.

The utility model is applicable 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, an insulating dielectric layer is arranged on at least partial region of a first doping layer, and at a preset position of a spacer region, a second doping layer is arranged on the insulating dielectric layer; the insulating dielectric layer is provided with an extension section which extends out of the first region and is at least partially bent towards one side where the silicon substrate is located, and the extension section, the first doping layer and the silicon substrate jointly form a deposition space. And at the first cross section along the first direction, the extension section, the first doping layer and the silicon substrate jointly form a closed pattern. The electric leakage doping part is arranged in the deposition space and forms electric leakage contact with the first doping layer. At the preset position, the second doping layer is provided with a first extension part which extends and covers at least partial area of the extension section, and the first extension part is in conductive contact with the electric leakage doping part. Therefore, the efficiency loss caused by electric leakage contact can be reduced while the hot spot resistance of the back contact battery is improved.

The utility model discloses a perovskite battery assembly, a photovoltaic assembly and electric equipment, and relates to the technical field of batteries. The perovskite battery assembly comprises a first substrate and a perovskite battery functional layer. The perovskite cell function layer comprises a first electrode layer, a perovskite light absorption layer and a second electrode layer. The first electrode layer comprises a first scribe line, the perovskite light-absorbing layer comprises a second scribe line group corresponding to the first scribe line, and the second scribe line group comprises a plurality of second scribe lines, the perovskite light-absorbing layer and a third scribe line of the second electrode layer. Since the second lineation group comprises a plurality of second lineation lines, the second electrode layer can be connected with the first electrode layer through the plurality of second lineation lines, and the area of the dead zone of the perovskite cell function layer can be reduced by designing the first part and the second part in the third lineation line. And the photoelectric conversion efficiency of the perovskite battery assembly is improved.

The invention belongs to the technical field of photovoltaic cells, and particularly relates to a back contact photovoltaic cell, a back contact photovoltaic cell assembly and a preparation method, and the method comprises the steps: providing an N-type silicon wafer which is provided with a double-sided texturing structure, and the textured surface is of a pyramid structure after texturing; boron diffusion is carried out on the backlight surface of the silicon wafer to form a P + doping layer, and meanwhile, a lightly doped P-type region is formed on the illuminated surface of the silicon wafer through diffusion and dissipation; performing laser film opening on the backlight surface P + doping layer to form P region and N region structures which are distributed in a staggered manner; depositing a tunneling oxide layer and a phosphorus-doped amorphous silicon layer in the N region, and annealing the tunneling oxide layer and the phosphorus-doped amorphous silicon layer to form an N + polycrystalline silicon layer; printing etching slurry on the surface of the P region, performing etching slurry film opening, removing phosphorosilicate glass and forming an isolation gap between the P region and the N region; and the film is opened by printing etching slurry, so that the suede cannot generate thermal damage.

Disclosed in the present invention are a photovoltaic air conditioning system, and a control method and control apparatus therefor. The control method comprises: obtaining air conditioner load prediction result data on the basis of known air conditioner load data and an established air conditioner load prediction model; obtaining photovoltaic power generation prediction result data on the basis of known photovoltaic data and an established photovoltaic power generation prediction model; obtaining power grid load prediction result data on the basis of power grid data and an established power grid load prediction model; determining a first energy storage battery charging and discharging strategy on the basis of the air conditioner load prediction result data, the photovoltaic power generation prediction result data and the power grid load prediction result data; and determining a second energy storage battery charging and discharging strategy on the basis of the first energy storage battery charging and discharging strategy and a state-of-charge threshold adjustment strategy, and controlling the charging and discharging process of an energy storage battery assembly on the basis of the second energy storage battery charging and discharging strategy. The present invention can improve the efficient operation performance of a photovoltaic air conditioning system.