424results about How to "Uniform current distribution" patented technology

The invention discloses a reverse-conducting insulated-gate bipolar transistor (RC-IGBT) with a P floating layer current bolt, and belongs to the field of semiconductor power elements. A medium buried layer is led in between an N collector region and a P collector region of a traditional RC-IGBT, and the P floating layer current bolt is led into an N-type buffering layer above the medium buried layer. According to the RC-IGBT with the P floating layer current bolt, other parameters of an element are not affected, break-over voltage of a snapback is obviously lowered, a reverse recovery soft factor is improved, current is distributed uniformly, local over-heating phenomenon is avoided, and the reliability of the RC-IGBT is improved.

The invention discloses a method for realizing high voltage of a monomer battery, preparation of a monomer battery and a battery pack manufacturing method of the monomer batteries. The high-voltage monomer battery comprises a positive plate (3), a diaphragm (4), a negative plate (6), a diaphragm (4), ..., a positive plate (3), a diaphragm (4), a negative plate (6), a diaphragm (4) and a monomer battery flexible package membrane (8), wherein the diaphragms (4) are arranged between the positive plates (3) and the negative plates (6) in a spacing manner, and space the negative plates (6) and thepositive plates (3) in sequence; an aluminum plastic membrane (shell) is wrapped on the outermost side; a positive electrode comprises a positive electrode current collector and an active substance Alayer; the active substance A layer is prepared from 95.0 to 99.0 percent of an active substance A, 0.5 to 3.0 percent of a conductive agent and 0.5 to 2.0 percent of an adhesive; a negative electrodecomprises a negative electrode current collector and an active substance B layer; the active substance B layer is prepared from 95.0 to 99.0 percent of an active substance B, 0.5 to 2.0 percent of aconductive agent, 0 to 1.0 percent of a thickening agent and 0.5 to 3.0 percent of an adhesive. The monomer battery disclosed by the invention is high in voltage, and relatively high in volume energydensity and rate performance.

The invention relates to a birdcage coil for a magnetic resonance imaging system and a tuning method thereof. The birdcage coil comprises an upper annular conductor, a lower annular conductor and a plurality of linear conductors which are distributed on a cylindrical surface, wherein the linear conductors are connected between the upper annular conductor and the lower annular conductor. A plurality of capacitors are connected in series in the upper annular conductor and the lower annular conductor. The whole or a part of the linear conductor is flexibly bendable and deformable. The distance between the upper annular conductor and the lower annular conductor is changed when the degree of bending deformation of the linear conductor is adjusted so that the resonant frequency of the birdcage coil is changed. The resonant frequency is adjusted by changing the position of a debugging ring. Thus, an expensive adjustable capacitor device is replaced so as to reduce the cost of the birdcage coil. The birdcage coil can be easily debugged at the installation site of the magnetic resonance system. The structure of the whole birdcage coil is adjusted synchronously and a large tuning range is achieved. The distribution of coil current and the uniformity of an RF magnetic field inside the coil are not influenced. The birdcage coil is stable in mechanical structure and can withstand high voltage.

The present invention provides a winding lithium paste battery. The winding lithium paste battery has a battery cell formed by winding of a positive plate and a negative plate, the electrode active conductive material layer of the electrode piece comprises non-bonded and fixed electrode active conductive particles. The winding lithium paste battery further comprises a leakage preventing portion, the leakage preventing portion is arranged at the edge of the positive plate and/or the negative plate or arranged on a housing to prevent the positive pole active conductive particles in the positivepole active conductive material layer from being leaked from the positive plate and/or prevent the negative pole active conductive particles in the negative pole active conductive material layer frombeing leaked from the negative plate. The winding lithium paste battery is more compact in structure, can regulate the shape for the application occasions, and is convenient and flexible in application. Besides, the winding lithium paste battery employs the uniformly distributed multi-tab group or full-tab design to effectively improve the current conduction capacity, improve the current distribution and improve the utilization rate of the electrode active conductive materials.

A process method of a vertical LED chip with a current expending and blocking layer on GaN base includes: forming a metal (gold, indium, tedium) layer on a sapphirine underlay; forming an intermediate layer and GaN expending layer on the metal layer; forming current expending layer and the secondary electrode on the P-GaN layer of GaN expending layer; heat to melt the metal layer to separate the underlay and the LED on GaN base; forming a premier electrode on the removing layer.

This invention discloses a folded polar plate lead acid battery and its making method, among which the lead wire connecting two plates is folded into u-shape and monopolar and bipolar plates are arranged in the box in sequence according to the matched polarities, a V-shaped diaphragm wraps both sides of each plate, insulation bag sleeve two adjacent polar plates and the diaphragm warapping the polar plates, realizing internal serials connection by lead wires. The lead acid battery has the advantages of small volume, light weight and good power characteristic.

The invention relates to technique for improving an electric heating element, in particular to nano far infrared negative ion carbon crystal conductive paper and a method for making the same. The conductive paper resolves the problems of the uneven heat generation, the existence of heat spot and the excessive temperature difference existing in prior electric heating products and is used for electric heating elements for anti-static electricity and making of heating electric hot plates. The conductive paper comprises the following components in percentage by weight: 70 to 96 percent of paper pulp, 2 to 20 percent of nano carbon fiber, 1 to 5 percent of nano far infrared negative ion powder and 1 to 5 percent of dispersing agent. In the invention, by using paper pulp, nano carbon fiber, nano far infrared negative ion powder and dispersing agent as materials and undergoing steps of pulping, pulp beating, pulp mixing, papermaking, drying and scrolling, etc., the conductive paper is made; in the process of pulp beating, the pulp mixing step is made; the pulp mixing step is as follows: nano carbon fiber and dispersing agent and nano far infrared negative ion powder are evenly added in the paper pulp. The invention possesses of functions of the emission of far infrared rays and the release of negative ions at the same time and can effectively and completely release electric charges, thereby having effects of purification and disinfection and making human bodies healthier.

The invention relates to an improvement of apparatus in aluminium electrolytic industry, specially relate to a large-sized lining structure for prebaking aluminium electrolysis. The inventive lining structure has, on the bottom of electrolytic cell housing, from the bottom up, in order, asbestos plate layer, heat-insulating layer made of calcium silicate plate with heat-resisting, heat-insulating layer made of both layers light-weight bricks, impermeable layer made of one layer alumina, impermeable layer made of both layers firebricks, half-graphite-rod-cathode complex TiB2 coating, with the leteral of allotypic lateral mass. The advantages of the invention are that: (1) the structure has higher heat conductivity, lower electrical resistivity and low dilatability of electrolytic sodium, and current distribution in cathodic charcoal is more uniform; (2) impermeable layer is especially advantageous for prolonging the life of electrolytic cell; (3) allotypic lateral mass has higher thermal conductivity and lower electrical resistivity, in particular, prolonging the the life of electrolytic cell. The large-sized lining structure for prebaking aluminium electrolysis of more than 200kA is used in the invention.

The invention discloses a zinc negative electrode material of a zinc air cell and a preparation method for the zinc negative electrode material. The negative electrode material comprises metal zinc powder, zinc oxide powder, a binder, and a dual-functional additive with a one-dimensional tubular structure and formed by dual-layer metal oxide; the preparation method comprises the steps of adding the metal zinc powder, the zinc oxide powder, a conductive agent and the dual-functional additive into a binder-containing solution, performing ultrasonic dispersion processing, and heating and evaporating a solvent while stirring to obtain the zinc negative electrode material. The zinc negative electrode material is added with the dual-functional additive which can lower electrode internal resistance as well as supply a diffusion channel for an electrolyte, so that the discharging capacity and the rate capability of the cell can be improved; and meanwhile, a titanium dioxide inner layer has super-hydrophilic property and insulativity, so that the water delivery property of the electrolyte diffusion channel is forcefully enlarged, channel blocking is prevented, and the cycling life and the capacity stability of the cell are effectively prolonged and improved.

The invention discloses a GaN base LED epitaxial wafer with the p-type contact layer and the preparation method, wherein the structure of the epitaxial wafer is a substrate, a low temperature buffer layer, an n-type layer, a quantum well, a p-type layer, a p-type contact layer in turn from the lower to the upper and the p-type contact layer is the quantum well layer structure. The invention is added with a p-type contact layer structure on the structure basis of the epitaxial wafer, wherein the p-type contact layer adopts the quantum well structure, due to the different energy of the well layer and the barrier layer valence band to effectively advance the hole density of the layer. Meanwhile, the motion of the hole on the direction vertical to the quantum well plane is restricted, which is favorable for the two-dimensional motion for the hole on the quantum well plane, under the applied voltage is favorable for the expansion in the p-type layer to cause the current distribution more uniform, to increase the performance of the LED. The preparation method of the epitaxial wafer provided in the invention is simple, low in cost, precise in the preparation condition, which realizes the industrialization production.

The invention provides a high-voltage single solid-state lithium ion battery. The lithium ion battery comprises three or more plate-shaped electrodes which are stacked in sequence, wherein the three or more plate-shaped electrodes are sequentially a negative electrode, at least one bipolar plate electrode and a positive electrode from top to bottom, the plate-shaped electrodes are separated by solid electrolyte layers, and the plate-shaped electrodes and the solid electrolyte layers are bonded together in a thermal compounding mode and packaged into a single battery. According to the battery,internal series connection of the single battery is realized, and the problem of difficult packaging or complex packaging structure caused by using a liquid electrolyte is avoided; the single batteryis adjustable in capacity and voltage, high voltage of the single battery can be conveniently realized, and the problems of heating or poor multiplying power and the like when the conventional lithiumion batteries are externally connected in series are avoided; the connection of the energy storage assembly is optimized, and the internal resistance of the battery is reduced; and the production process and equipment are basically the same as those of the existing lithium ion battery, so that large-scale industrial production is facilitated. The invention also provides a preparation method of the high-voltage single solid-state lithium ion battery.

This invention discloses a method for preparing titanium/copper composite board, which is composed of a copper board partially or completely coated with a titanium layer. The titanium/copper composite board is prepared by one or more of welding, rolling and hot pressing. The titanium/copper composite board has such advantages as high conductivity, high corrosion resistance and low cost, and can be used as matrix material for inert anode. Inert anode prepared from the titanium/copper composite board has such advantages as low calorific amount, low tank voltage, long service life, uniform current distribution and high electrolytic product purity.

The invention belongs to the field of circuit board processing, and relates to a method for improving the electroplating uniformity of a PCB (printed circuit board). By adopting the method disclosed by the invention, an anode is converted into an up-and-down sliding mode from a position fixing mode so as to ensure that the vertical length difference between a cathode and the anode can be eliminated, and uniform current distribution in an electroplating process can be ensured; a conventional wire connection mode of the anode can be changed so as to ensure that the electrical potential size difference of the current distribution of the anode can be changed and can be complementary with the electrical potential size difference of the current distribution of the cathode; the uniformity of an electroplating copper layer can be improved, and the copper consumption per unit area can be reduced; in a copper electroplating process, integral resistance in an electroplating cylinder is relatively balanced, so that power lines distributed in the electroplating cylinder are uniform, and thus the electrical potential size difference of upper and lower current distribution in the electroplating cylinder can be effectively eliminated; and by adopting the electroplating copper layer with good uniformity, difficulties of circuit etching can be reduced, the purposes of reducing the production scrap rate and improving the quality of the PCB can be achieved, and great market economic values and application prospects can be achieved.

The invention discloses a radio frequency device which is used for a plasma treatment device and comprises a radio-frequency power supply, a radio-frequency matcher and at least two groups of inductive coupling coils, wherein the proportion of the radio-frequency current in the inductive coupling coils is regulated by a current regulating device; and the current regulating device comprises a variable capacitor and an inductance component. The imaginary part of the total impedance including the current regulating device and the inductive coupling coils is inductive by reasonably setting the inductance value of the inductance component; and the impedance matching is realized by the traditional radio-frequency matcher comprising a plurality of capacitive components when the imaginary part of the total impedance is inductive, the matching process is simple and practicable, and the cost is also lower.

The invention relates to a fuel cell stack bandage type pressing assembly structure and a design method thereof and belongs to the technical field of fuel cells. The structure comprises multiple fuelcells. A main end plate is arranged at one end of the fuel cells and an auxiliary end plate is arranged at the other end of the fuel cells. A plurality of compression belts are arranged between the outer wall of the main end plate and the outer wall of the auxiliary end plate. A fixing screw in threaded connection and fixation with the main end plate is arranged between one end of each compressionbelt and the outer wall of the main end plate. A hook pin fixedly connected with the main end plate in a clamped and embedded mode is arranged between the other end of each compression belt and the outer wall of the main end plate. A plurality of belt holes are formed in the compression belts. A plurality of gap adjusting springs are arranged between the auxiliary end plate and the fuel cells, and spring gaskets are arranged between the gap adjusting springs and the auxiliary end plate. The assembly structure has the advantages of compact structure, compression supplement, high sealing performance, uniform current distribution, easiness in assembly and maintenance and long service life. The repeatability of the assembly structure is improved, and the structural pressure uniformity is improved. The influence of manufacturing tolerance and change of raw material size on the structural size precision is avoided.

The invention discloses symmetrical electrodes for a triangular GaN-based light-emitting diode (LED) chip, and belongs to the technical field of LED chips. The LED chip is in a triangular shape; a pad of an N-type electrode is positioned at the vertex angle of the triangular chip; an N-type strip electrode starts from the N-type pad to enclose the periphery along the edge of the triangular LED chip; a pad of a P-type electrode is positioned in the center of the triangular chip; a P-type strip electrode is firstly distributed along the direction perpendicular to the bottom side of the triangle and then distributed parallel to the edge of the triangular LED chip. The N electrode and the P electrode are symmetrically distributed in the LED chip so as to guarantee uniform current distribution of the triangular LED chip. Therefore, the aim of improving the light-extraction efficiency and service life of the triangular LED chip is fulfilled.

The invention discloses an indium tin oxide (ITO) stereo electrode and a preparation method thereof. The ITO stereo electrode in the invention comprises a conductive layer and a plurality of ITO conductive nano columns formed on the surface of the conductive layer, the adjustable length range of the ITO stereo electrode nano column is 10nm-1500nm, and the optimal length adjustable range is 50nm-200nm when the ITO stereo electrode nano column is applied in a solar battery. When the ITO electrode with a stereo structure is applied in an organic optoelectronic component, such as an organic solar battery, an organic light-emitting diode and the like, the contact area of an active layer and the electrode can be increased, thus effectively enhancing the efficiency for injecting or educing current. The invention also discloses an evaporator for preparing the ITO stereo electrode, the organic solar battery containing the ITO stereo electrode and a method for preparing the organic solar battery.

The invention belongs to the field of heavy metal wastewater treatment and provides an electric flocculation unit, an electric flocculation device and a heavy metal wastewater treatment system. The electric flocculation unit comprises a shell, an anode bar, a cathode tube, iron carbon ball filler, a rotary type scraper device, an ultraviolet lamp, an aerating device, a power module and a liquid conveying mechanism, wherein the cathode tube is vertically arranged in the shell, the anode rod is vertically arranged in the cathode tube, the rotary type scraper device and the ultraviolet lamp are arranged in the cathode tube, the rotary type scraper device is movably connected with the shell through a bearing, the shell is detachably connected with the cathode tube and the anode bar, an insulating plate where a diffluence hole is formed is detachably connected to the cathode tube, and the iron carbon ball filler is stacked on the insulating plate. The electric flocculation device disclosed by the invention comprises a plurality of electric flocculation units, supports and liquid storage tanks, wherein the electric flocculation units, the supports and the liquid storage tanks are communicated through pipelines to be in parallel connection or serial connection. The heavy metal wastewater treatment system comprises the electric flocculation device, an air floating device and an ion exchange device, wherein are sequentially connected with each other. The heavy metal wastewater treatment system disclosed by the invention has a good heavy metal wastewater treatment effect and convenience in disassembling and cleaning.