68results about How to "Uniform distribution of current density" patented technology

The invention discloses a microelectroforming machine tool. The microelectroforming machine tool comprises a base of the machine tool, wherein a workbench is arranged on the base, a liquid storage groove is arranged below the workbench, an electroforming groove is arranged on the workbench, an anode clamping unit and a cathode clamping unit are arranged in the electroforming groove, the anode clamping unit is used for placing an anode, a cathode clamping unit is used for placing a cathode, a filtration circulating unit connected with the liquid storage groove is arranged on the base, and the microelectroforming machine tool further comprises an anode horizontal feed unit, an anode rotating unit, a cathode rotating unit and a motion control system. The microelectroforming machine tool disclosed by the invention is compact in structure, the arrangement ways of electrodes are flexible and changeable, the motion modes of the electrodes are diverse, the operation is simple and convenient, the functions are abundant and automatic, and the microelectroforming machine tool can meet different application requirements of an electroforming process and give a full play to the potential of the electroforming device.

The invention relates to a fuel cell flow field structure, in particular to a proton exchange membrane fuel cell flow field structure. The proton exchange membrane fuel cell flow field structure comprises an interdigitated flow field runner and a snake-shaped flow field runner; a plurality of runners consisting of the interdigitated flow field runner and the snake-shaped flow field runner are arranged on the same side of a flow field board; a runner air inlet hole is formed at a proper position of one end of the interdigitated flow field runner; a runner air outlet hole is formed at a proper position of one end of the snake-shaped flow field runner; and the interdigitated flow field runner and the snake-shaped flow field runner are connected with each other through a connecting runner. In the proton exchange membrane fuel cell flow field structure, the flow field runners are quick in water drainage; moreover, runner plugged, short circuit or channeling phenomena can be avoided; the current density distribution is uniform, the cell performance is higher, the structure is simple and rational, and the manufacturing cost is low; and the proton exchange membrane fuel cell flow field structure has wide social benefit and market prospect.

The invention provides a pole piece and an application thereof, and a low temperature rise safety lithium ion battery containing the pole piece, the pole piece comprises a current collector, and at least two active coatings and at least one efficient conductive PTC film are fixedly arranged on each of two opposite surfaces of the current collector; the active coating and the efficient conductive PTC film are arranged at intervals from inside to outside from the surface of the current collector, and the outermost side is the active coating; the conductivity of the active coating on the outermost layer is smaller than that of the other active coatings, and/or the active substance of the active coating on the outermost layer adopts an active substance with high thermal stability. According tothe pole piece disclosed by the invention, the internal temperature distribution is more uniform, the temperature rise of conventional use or internal short circuit of the battery is reduced, and thermal runaway can be slowed down, so that the safety of the lithium ion battery is improved.

The invention discloses a light emitting diode chip with an inverted structure and a fabrication method of the light emitting diode chip, belonging to the technical field of a semiconductor. The light emitting diode chip comprises a substrate and a P-type current extension layer, a P-type limiting layer, an active layer, an N-type limiting layer, an N-type current extension layer, an N-type ohmic contact layer, a P-type ohmic contact layer and a transparent conductive layer which are sequentially laminated on the substrate, wherein the P-type ohmic contact layer and the N-type ohmic contact layer are GaAs layers, the transparent conductive layer is an indium tin oxide (ITO) layer, and a plurality of through holes are formed in the P-type ohmic contact layer and the N-type ohmic contact layer and extend to the N-type current extension layer. With the adoption of the ITO transparent conductive layer, current extension is achieved, the extended current is injected into the N-type current extension layer through the ohmic contact layers, so that the current is extended very well, the current density distribution is uniform, and the luminous efficiency and the luminous intensity are improved.

The anode device for continuous electroplating of belt poor conductor consists of at least one anode unit. The anode unit consists of one through cavity, one upper insulating cover plate and one lower insulating cover plate. The through cavity is formed with the first anode plate, the first insulating baffle, the second anode plate and the second insulating baffle connected successively. The upper insulating cover plate is connected to the upper port of the through cavity, the lower insulating cover plate to the lower port, and both the upper insulating cover plate and the lower insulating cover plate have slot with symmetrical plane coinciding with that of the through cavity. The through cavity has flared longitudinal profile passing through two anode plates. Owing to the special shape of anode to control the current density for electrically depositing metal, the single electroplating bath may have maximum anode length, and the continuous electroplating production line may have least electroplating baths.

The invention discloses a lithium battery of high specific energy and high power, and a manufacturing method thereof. A first cell 1 provides specific energy as high as 150Wh/kg; a second cell 2 provides high power needed in cell pulse; by virtue of the characteristics of uniform current density distribution, low cell heating amount and heat uniform diffusion of the second cell 2, the battery canprovide high power when a high energy state is maintained; and heat is provided for the second cell 2 by the heating amount of the first cell 1 at a low temperature, so that the second cell 2 also canprovide excellent pulse charging-discharging performance at a low temperature, thereby improving the normal temperature and low temperature pulse charging-discharging performance of the cells.

The invention discloses a method for manufacturing a square-round core aluminum-plastic membrane lithium ion battery for evaluating. An anode and a cathode prepared by a general method according of a lithium ion battery, then are coiled to form a round core, and are sealed into a square battery-grade aluminum plastic membrane bag, and an air chamber is reserved. The structural design avoids defects that a current battery structure is not easy to control an assembling ratio and assembling pressure when evaluating an electrode material and the material is not continuously tested because of bulge and leakage of the battery caused by gas generation, has performance suitable for evaluating various materials under different technologies, and has characteristics of low investment equipment cost.

This invention belongs to the field of the silica micro-machine and the electrical chemistry, specific about a kind of micro sensor on the base of antibody and antigen method to detect the fibration of the liver. It is made up of the working electrode, reference electrode, pairing electrode and the base board. Among these, the working poles have the shape of circle or like a circle and they range symmetrically. And the reference electrode is like the letter 'U', set between the working electrode. Besides, the pair pole looks like a trip, set between the reference poles. The base board is made up of the composite silicon packing block and the SiO2 layer. There are 4-8 working electrode and the electrode and the SiO2 layer are bonded with the Ti tack coat, and each electrode can be made with the simple film technology of the IC technology. In a word, the invention has small micro-sensors, costs little and has high authenticity. It can detect out the concentration of the antigen in the serum quantitatively and meanwhile measure several data of the serum, and the quantity of the serum is small.

The invention relates to a welding method of a composite copper bar conducting layer. A welding part of a lead workpiece is positioned on a mounting part of a copper bar substrate by a positioning structure, so that next welding is facilitated. After positioning, a resistance soldering technology instead of chamfering is adopted, so that the mounting part can be arranged in any position of the copper bar substrate, the lead workpiece can be welded on the mounting part, a complicated composite copper bar product comprising a small forming part structure is obtained, and the welding strength and the connection reliability are improved. A non-welding part of the lead workpiece is placed in a heat-dissipation mold, so that heat of the non-welding part of the lead workpiece conducted by welding can be dissipated by the heat-dissipation mold, the non-welding part of the lead workpiece can avoid softening deformation and hardness and strength reduction due to overheating, the hardness and the strength of the non-welding part are ensured, and torsion resistance of riveting a nut in a non-welding area is ensured. In addition, the invention further relates to a composite copper bar.

The invention relates to the field of cathode line processing equipment, and in particular to cathode line welding equipment. The cathode line welding equipment comprises a rack, and a feeding assembly and a welding assembly which are arranged on the rack, wherein the welding assembly is arranged on a feeding line of the feeding assembly, an internal clamping device is arranged at the upstream of the welding assembly, and an external clamping device is arranged at the downstream of the welding assembly; the feeding assembly comprises a sliding rail on the rack and a feeding device arranged on the sliding rail in a sliding manner, and the feeding device, the internal clamping device and the external clamping device are arranged on one central axis; the welding assembly comprises six groups of welding components, which are circumferentially arranged in an array with the central axis as a center and are distributed spirally along the axial direction of the central axis, and the axial direction of the welding ends of two groups of welding components opposite to each other in the radial direction is equal to the axial length of half welding cycle of a cathode line to be welded. The special cathode line welding machine adopts a semi-automation production process, realizes automatic feeding and welding, and can be used for producing cathode lines quickly and efficiently.

The invention relates to a grid of a lead-acid battery and a lead-acid battery. The grid comprises a grid-shaped current collector and a frame; the grid-shaped current collector comprises a pluralityof first ribs and tabs, wherein the first ribs extend in a preset direction, and the tabs are connected with the first ribs; the frame comprises a plurality of supporting strips and a border, whereinthe supporting strips are connected together; the first ribs intersect with the supporting strips; the same ends of the first ribs are fastened with the bottom edge of the frame; the first ribs are atleast partially embedded into the supporting strips; the grid-shaped current collector is connected with the frame, so that a mesh structure is formed in the middle of the grid; the density of the frame is smaller than that of the grid-shaped current collector.

The invention provides an electroplating processing device for an inner bore and end faces of a workpiece. The inner bore is formed in the processed workpiece in the length direction; a processing device includes an anode bar, and the axis direction of the anode bar is defined as a first direction; the processing device further includes a fastening structure, and a first anode plate, a first fixing piece, a second fixing piece and a second anode plate which are sequentially arranged on the anode rod in a sleeving manner in the first direction; the first fixing piece and the second fixing pieceare arranged at an interval; a first through hole is formed in the first fixing piece; and when the processed workpiece is arranged on the anode bar in a sleeving manner and is contained in a first space, the inner wall face of the first through hole is located at the outer side of the boundary of the inner bore in a first end face, and a gap is present between the first anode plate and the firstend face as well as between the second anode plate and a second end face. The electroplating processing device can change the distribution of power lines in the electroplating process of the workpiece, and thus, uniform distribution of the current density of the electroplated surface of the workpiece is promoted, plating is evenly deposited on the surface of the workpiece, so that chromium plating of multiple parts of the inner bore and the end faces is completed at a time.

The invention provides a simulation analysis method for current density distribution of a high-temperature superconducting direct-current system considering the overall utilization rate of a superconducting tape. Firstly, a three-dimensional model is established for a high-temperature superconducting direct-current cable conductor, current distribution on the superconducting conductor is obtainedby solving the three-dimensional model, the overall utilization rate of strips is improved by optimizing the screw pitch of the superconducting strips, current distribution on each superconducting strip is uniform, and the use amount of the strips is small.

The invention discloses composite diaphragm slurry and a composite diaphragm, and belongs to the technical field of lithium ion battery diaphragm production. The composite diaphragm comprises the following raw materials of: 10-20 parts of polymer coated ceramic particles, 10-25 parts of deionized water, 0.01-0.1 part of a dispersant, 1-3 parts of a binder and 0.01-1 part of an auxiliary agent. The preparation method of the polymer coated ceramic particles comprises the following steps of: uniformly mixing a polymer, ceramic particles and a dispersing agent; and then preparing the polymer coated ceramic particles in an inert atmosphere through a spray drying method. The polymer is one or two of polyisophthaloyl metaphenylene diamine and polyimide. A lithium ion battery prepared from the composite diaphragm has better multiplying power and safety performance. A coating layer has good wettability and liquid retention for electrolyte, and is beneficial to improving the rate and long cycle performance of the battery.