22results about How to "Uniform current distribution" patented technology

The application provides an inverse-conducting insulated gate bipolar transistor and a preparation method thereof, and belongs to the technical field of power semiconductor devices, and comprises: a first groove is a gate groove, a second groove is an emitter groove, and a third groove is an ineffective gate groove; in the lateral direction parallel to the cell surface, the first groove, the second groove and the third groove are sequentially and spacedly arranged, and the first groove and the second groove are connected through a fourth groove, and the fourth groove is a gate groove; in the longitudinal direction, the second groove is located between two adjacent fourth grooves. The beneficial effects are as follows: the gate groove and the ineffective gate groove are connected through the lateral gate groove, the forward conduction voltage drop and the conduction loss of the device are reduced; the current channel is increased, the current distribution is more uniform, the heat loss is reduced, the reliability and the power density of the device are improved; the emitter groove is used for repeatedly arranging the polysilicon gate and the metal gate in the lateral and longitudinal directions, the regularly arranged diodes and Schottky diodes are formed, and the reverse diode current distribution is more uniform.

Provided in the embodiments of the present application is a megawatt parallel pipe type charging pile cable, specifically: the cable comprises a sheath assembly, a main power line, cooling pipes and core wires; wherein the cooling pipes are at least 4 in number; the sheath assembly covers the main power line, the cooling pipes and the core wires; the cooling pipes are arranged in close contact with the sheath assembly, and the cable is centrally provided with the core wires; the cooling pipes are distributed at equal intervals; the main power line comprises positive power lines and negative power lines, and the positive power lines and the negative power lines are arranged in one-to-one correspondence and symmetry; the positive power lines and the corresponding negative power lines are arranged in close contact with different cooling pipes, respectively. The present application adopts a multi-core split design for the main power line comprising positive power lines and negative power lines, each independent core wire is closely attached to the outer wall of the cooling pipe, heat conduction is strengthened through direct contact, and heat is efficiently transferred vertically to the cooling liquid.

This invention discloses a design method for parallel current sharing of BOOST multiphase interleaved silicon carbide single transistors. It identifies key parasitic parameters by building a dual-pulse simulation platform, completes device layout in conjunction with the overall system structure, uses PCB symmetry and copper layer stacking to control parasitic parameter consistency, and forms a design closed loop through dual-pulse and steady-state thermal testing. This effectively solves the problem of poor current sharing in parallel silicon carbide single transistors. Furthermore, this method ensures balanced current distribution during switching transients and conduction steady states, eliminates current sharing failures caused by parasitic parameter mismatch, fully utilizes the performance of silicon carbide single transistors without requiring amplification device margins, flexibly adapts to the overall system layout, improves space utilization, optimizes system efficiency, reduces design costs and redundancy, and achieves a reliable, efficient, and highly adaptable design for parallel current sharing of BOOST multiphase interleaved silicon carbide single transistors.

The invention relates to the technical field of submerged arc furnaces, and discloses a large energy-saving direct-current submerged arc furnace which comprises a bottom plate and a fixing frame arranged on the bottom plate. According to the large energy-saving direct-current submerged arc furnace, the particle size of ore is controlled through extrusion and crushing, materials are automatically stricken by a strickling plate, a conical rod rotates and guides, the particle size is screened according to intervals, and ferromagnetic impurities are removed through a magnetic attraction belt; the electrode and furnace lining loss is reduced; inert gas is introduced into an airflow plate of a heating furnace to strengthen stirring of a molten pool and promote full contact of effective components and a fluxing agent, a full-direct-current framework is adopted to eliminate alternating loss, a double-inverse-star-shaped non-in-phase inverse parallel topology is matched, and mutual counteraction of current and a magnetic field is utilized, so that the material with the particle size exceeding the standard is obtained. Copper pipe hysteresis and eddy current loss are reduced, the operating temperature is controlled, the topological multi-pulse rectification optimizes the current waveform, the reactive power is reduced, and a high-capacity reactive power compensation device is omitted; and meanwhile, the length of the short net is shortened, the conductor section is optimized, an additional heat dissipation pipeline is not needed, and energy consumption and investment are reduced.

The invention discloses a Ce-based alloy sputtering target and a preparation method thereof, the sputtering target comprises any one of Sm, Gd and Y, and further comprises Ce and inevitable impurities, the content range of the Sm, Gd or Y element is 5-25 atom%, the impurities comprise C, S and O, and the Vickers hardness of the sputtering target is greater than 35 Hv. The Ce-based alloy sputtering target provided by the invention solves the problems that the existing Ce-based alloy target is easy to oxidize in the sputtering process, the sputtering rate is unstable, the formed CeO2-based electrolyte film is not compact and the like.

This invention provides a partition wall, a partition wall assembly, and an electrolytic cell that can suppress gas accumulation even when the partition wall separating the anode and cathode chambers of the electrolytic cell has recesses. The partition wall (8) of the electrolytic cell has a first main surface (20) and a second main surface (22) located on the side opposite to the first main surface (20). The first main surface (20) includes a first flat portion (24) and a plurality of first recesses (36) that are recessed from the first flat portion (24). The edges (40) of the first recesses (36) are rounded. The second main surface (22) includes a second flat portion (30) and a plurality of second recesses (42) that are recessed from the second flat portion (30). The edges (46) of the second recesses (42) are rounded.

The application belongs to the field of batteries, and particularly relates to a battery pack and a heat transfer pipe. The application overcomes the problem of local high heat of a single battery pole in an existing battery pack, which causes thermal runaway. The battery pack comprises a plurality of battery components; the battery components comprise a battery module and two heat transfer pipes; the battery module comprises a plurality of single batteries; the two heat transfer pipes are arranged on total positive terminals and total negative terminals of the battery module respectively; each heat transfer pipe is provided with two mutually isolated sub-channels; in the plurality of battery components, the heat transfer pipes are connected in series in a set order; after cooling liquid enters a total liquid inlet end, the cooling liquid flows through one sub-channel in each heat transfer pipe in turn, and then flows through the other sub-channel in each heat transfer pipe in turn through a loop turning node, and finally flows out from a total liquid outlet end. The application directly contacts the heat transfer pipe with the polarity terminals of the single batteries, and simultaneously realizes efficient and balanced heat dissipation of the polarity terminals based on the series connection structure of the heat transfer pipes.

The invention relates to a step special-shaped battery cell and a preparation method thereof and a step special-shaped lithium ion battery, the step special-shaped battery cell comprises a first battery cell unit and a second battery cell unit which are arranged in a stacked mode, and in the length direction and the width direction, the size of the first battery cell unit is larger than that of the second battery cell unit; the first battery cell unit and the second battery cell unit respectively comprise a first positive pole piece, a second positive pole piece, a first negative pole piece, a second negative pole piece and a diaphragm; the first positive pole piece and the second positive pole piece respectively and independently comprise a first positive active material, and the first negative pole piece and the second negative pole piece respectively and independently comprise a first negative active material; the second positive pole piece further comprises a second positive active material, and the second negative pole piece further comprises a second negative active material. According to the step special-shaped battery cell provided by the invention, by adding the high-rate second positive electrode active material and the high-rate second negative electrode active material, the current bearing capacity of the small second battery cell unit is effectively improved, and the current distribution between the small second battery cell unit and the high-rate second negative electrode active material is improved, so that the capacity retention ratio and the safety performance of the step special-shaped battery are greatly improved.

The embodiment of the present disclosure relates to the technical field of steel bar welding, and one embodiment of the present disclosure provides a steel bar butt welding equipment capable of achieving uniform welding, which comprises two left electrodes and two right electrodes, a butt welding frame, two electrode bearing parts and two steel bar conveying assemblies. The two electrode bearing parts are symmetrically arranged, each of the electrode bearing parts is provided with a left electrode and a right electrode, the right electrode can slide towards the left electrode, one of the electrode bearing parts is arranged on the butt welding frame, and the other electrode bearing part is arranged on the butt welding frame through an electrode position adjusting part. The two steel bar conveying assemblies are symmetrically arranged on the butt welding frame, and the electrode bearing parts are located between the two steel bar conveying assemblies. Through the above technical scheme, the steel bar butt welding equipment in the prior art is improved, the steel bar conveying precision and stability are improved during steel bar butt welding, and the problem that the steel bar welding efficiency is affected is solved.

The present disclosure provides a light emitting diode and a preparation method thereof, and belongs to the technical field of semiconductors. The light emitting diode comprises an epitaxial layer; the epitaxial layer comprises a first region and a second region, and the first region and the second region are arranged at intervals along a first direction; the first region comprises an electrode pad of a first conductive type, and the interior of the first region has a plurality of first electrode holes; the first electrode holes are of the first conductive type, and the edge of the first region does not have an electrode hole of the first conductive type; the second region comprises an electrode pad of a second conductive type, and the interior of the second region has a plurality of second electrode holes; the edge of the second region has a plurality of third electrode holes, and the second electrode holes and the third electrode holes are both of the second conductive type; and the first conductive type is different from the second conductive type. The present disclosure can improve the reliability of the light emitting diode.

The utility model provides an energy -conserving structure section steel claw belongs to aluminium smelting technical field. Energy -consaving structure section steel claw includes guide rod, crossbeam and branch leg. The material of guide rod is configured as aluminium. Crossbeam includes first combination layer and second combination layer, the material of first combination layer is configured as aluminium, the material of second combination layer is configured as steel, first combination layer and second combination layer mutually close surface explosive welding, guide rod is welded with first combination layer, and the both ends of crossbeam along the length direction of itself have the groove, and the groove is set to one side of crossbeam close to guide rod. The one end of branch leg along the length direction of itself is welded with second combination layer, and the number of branch leg is multiple, and multiple branch legs are arranged along the length direction of crossbeam, and the one end of branch leg away from crossbeam is inserted in anode carbon block, and the material of branch leg is configured as steel. The energy -conserving structure section steel claw of the utility model can reduce the resistivity of steel claw, improve the even degree of current distribution in steel claw and improve the structural stability of steel claw.

The invention relates to a battery cell and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of electrochemical energy storage. The battery cell comprises an electrode assembly, and the electrode assembly comprises a straight area and corner areas located on the two sides of the straight area; the electrode assembly is formed by winding a positive pole piece, a diaphragm and a negative pole piece which are stacked; the diaphragm comprises a base membrane and coatings located on the surfaces of the two sides of the base membrane. The negative pole piece comprises a current collector and a negative active material layer; the surface density of a negative electrode active material layer in the negative electrode plate in the corner region is M1 g / m < 2 >, and the surface density of the negative electrode active material layer in the straight region is M2 g / m < 2 >; the surface density of the coating in the diaphragm in the corner area is M3g / m < 2 >, and the surface density of the coating in the straight area is M4g / m < 2 >; meanwhile, 0.5 < = M1 / M2 < = 0.9, 0.3 < = M3 / M4 < = 0.8, and 0.09 < = (M1 / M2)-(M3 / M4) < = 0.40. The battery cell can effectively inhibit lithium precipitation and improve the cycle performance of the battery.

The utility model discloses a kind of intermediate frequency DC reactors, including magnetic core, coil, input conductive row and output conductive row, the magnetic core is oppositely equipped with two iron columns, the coil is equipped with two groups and is respectively wound on the two iron columns of the magnetic core, the coil is wound with thin wide metal foil and is formed, the input conductive row is located in the lower portion of this intermediate frequency DC reactor and is connected with the coil, the output conductive row is located in the upper portion of this intermediate frequency DC reactor and is connected with the coil. The utility model winding loss is small, and the heat dissipation performance is excellent, compact structure, high reliability, strong environmental adaptability, can be adapted to intermediate frequency working condition.

In order to improve the lithium precipitation problem of a pole piece, the invention provides a battery cell and a battery, the battery cell comprises a positive plate and a negative plate, the positive plate comprises a positive current collector, a positive tab and a positive active material layer, the positive active material layer is arranged on at least one side of the positive current collector, and the positive tab is connected with the positive current collector; the negative plate comprises a negative current collector, a negative tab and a negative active material layer, the negative active material layer is arranged on at least one side of the negative current collector, and the negative tab is connected with the negative current collector; in the length direction of the negative plate, the coating surface density of the negative active material layer is gradually increased along the direction far away from the negative tab; and in any region of the battery cell, the ratio K of the coating surface density of the negative electrode active material layer to the coating surface density of the positive electrode active material layer at the corresponding position is more than or equal to 0.4 and less than or equal to 0.52.

This utility model relates to the field of circuit equipment technology and discloses a busbar copper bus structure for improving parasitic inductance. It includes an improved busbar copper bus and a non-improved busbar copper bus. The improved busbar copper bus has a copper busbar substrate in the middle, a bent portion fixedly connected to the top of the substrate, a connecting portion fixedly connected to the top of the bent portion, and wiring extension plates fixedly connected to the lower sides of both sides of the substrate. A bent plate is fixedly connected to the other end of each wiring extension plate, and a wiring plate is fixedly connected to the other end of each bent plate. This busbar copper bus structure for improving parasitic inductance has a short distance of 17.5mm from the positive terminal of the positive busbar copper bus to the positive capacitor terminal, resulting in a shorter current path and better overall performance. It achieves the following technical effects: 1. Reduced parasitic inductance; 2. Improved dynamic response; 3. Optimized current sharing and thermal performance; 4. Suppression of electromagnetic interference (EMI); 5. Maximized capacitor efficiency.

This invention relates to a lead-acid battery, belonging to the field of lead-acid battery technology, to solve the problems of uneven current distribution and short cycle life of existing lead-acid batteries. The lead-acid battery includes a single cell, which comprises multiple positive and negative plates arranged in alternating layers. Each positive and negative plate includes a frame and tabs. The frame includes an upper frame, a lower frame, a left frame, and a right frame. Each positive and negative plate has a first tab and a second tab, symmetrically arranged along the length of the upper frame. The plane containing the first and second tabs is parallel to the plate surface. In the positive plate, the distance between the first and second tabs is d1; in the negative plate, the distance between the first and second tabs is d2, where d1 and d2 are different. In the positive plate, the first and second tabs are of the same size. The lead-acid battery of this invention has a long service life.

This invention discloses a high-power battery integrating a radioactive structure and a multi-element corrosion-resistant alloy, belonging to the field of lead-acid battery technology. It constructs a core component integrating a radioactive grid structure and a multi-element corrosion-resistant alloy. The radioactive grid adopts a centrally radiating structure, with 8-12 variable cross-section radial grid bars and 3-4 rings of progressively spaced annular grid bars forming a closed conductive network. The multi-element alloy is composed of Pb 98.5%-99.2%, Sn 0.3%-0.8%, Ag 0.05%-0.1%, Ca 0.06%-0.12%, and Al 0.03%-0.05%, with precise matching between composition and structure. The battery is manufactured through medium-frequency induction melting, controlled-cooling grid forming, stepped heat treatment, and optimized assembly processes. The battery has a C10 capacity of not less than 100Ah, a P15min discharge time of not less than 15min, a cycle life of not less than 780 cycles, a grid corrosion rate of not more than 0.023mm / a, and an energy utilization rate of not less than 87%. This design overcomes the performance bottleneck of traditional grid-alloy separation designs, combining high power, long lifespan, and high stability.

The utility model discloses a high light -efficient corn lamp, including lamp holder seat, lamp body, lamp shade and bottom cover, the lamp holder seat locates one end of lamp body, bottom cover locates the other end of lamp body, the lamp shade is located lamp body's outer surface, the lamp body includes heat dissipation main part and FCOB lamp strip, the heat dissipation main part is cylindrical, the front of heat dissipation main part is equipped with the mounting groove, the back of heat dissipation main part is equipped with a plurality of vertical fins, FCOB lamp strip can be detachably installed in mounting groove, bottom cover is circular, and bottom cover is installed in the bottom of heat dissipation main part, the back of heat dissipation main part and the bottom cover of circular form heat dissipation channel, and heat dissipation main part directly carries out heat dissipation to FCOB lamp strip, and the vertical fin of heat dissipation main part back increases the heat dissipation surface area, and heat dissipation channel is favorable to heat rapid discharge, can effectively give FCOB lamp strip heat dissipation, prevents the temperature of FCOB lamp strip from being too high and leads to luminous efficiency to drop.

The utility model relates to the technical field of antennas, in particular to a circularly polarized antenna and a wearable device. The circularly polarized antenna comprises a grounding plate which is provided with a feed port; the feed body is provided with a first coupling end and a second coupling end, and the first coupling end is electrically connected with the feed port; one end of the first radiator is connected with the second coupling end, and the other end of the first radiator is connected with the grounding plate; one end of the second radiating body is connected with the second coupling end, the other end of the second radiating body is separated from the grounding plate, and the second radiating body and the first radiating body are located on the two sides of the feed body respectively in the circumferential direction of the grounding plate. The first radiating body is grounded, so that when the circularly polarized antenna works, the current intensity of the grounding end of the first radiating body is relatively high, that is, current exists on the antenna branch knot and certain current exists on the grounding plate, and the current distribution on the left side and the right side is relatively uniform, so that a circularly polarized directional diagram is relatively symmetrical and stable; and the circular polarization effect of the circular polarization antenna is improved.

This invention belongs to the field of new energy storage materials technology, specifically relating to a method for preparing and applying an ultrathin copper current collector modified with a carbon nanotube composite coating. Addressing the problems of strong lithium repellency, uneven metal deposition, and short cycle life of copper current collectors in electrodeless lithium-ion batteries, this invention constructs a composite functional layer on an ultrathin copper foil, composed of zinc-based oxide rich in oxygen vacancies and carbon nanotubes. In this coating, the zinc-based oxide acts as a highly lithium-affinity site, effectively reducing the metal nucleation overpotential; the carbon nanotube network provides a rapid electron conduction path and alleviates deposition stress. The preparation process is environmentally friendly, employing an aqueous slurry system and a simple heat treatment process. This modified current collector, used in electrodeless lithium-ion batteries, can guide uniform and dense metal deposition, significantly improving the battery's coulombic efficiency and cycle stability.

The utility model discloses a kind of CSP lamp bead packaging structures of embedded coplanar welding.The packaging structure includes metal substrate and LED chip with first, second electrode.The core is, metal substrate and electrode have mutually adapted three-dimensional geometry configuration, and they form docking structure, so that electrode bottom surface and metal substrate bottom surface jointly form a wide coplanar welding plane.The utility model realizes the self-alignment and pre-welding mechanical locking of chip by three-dimensional docking structure, solves the existing tiny CSP chip mounting difficulty, the problem of low yield;And through the coplanar welding plane formed, fundamentally solve the problem of insufficient welding area, poor reliability, while optimizing heat dissipation performance.

This invention relates to the field of secondary battery technology and discloses a wound battery. The negative electrode sheet contains silicon-based material with a silicon content of ≥3% by mass. The negative electrode sheet has multiple negative electrode tabs. The arc segment of the positive electrode sheet has a first groove. The arc segment of the negative electrode sheet has a first concave-convex structure including a first protrusion and a first recess, and the projection of the first protrusion is at least partially located within the first groove. This invention reduces internal resistance and uniforms current distribution through the multi-tab structure; mitigates heat generation from lithium desorption through the first groove; releases expansion stress through the first concave-convex structure; and effectively suppresses heat accumulation in the arc region by forming a heat dissipation space through the cooperation of the first protrusion and the first groove, thereby improving the rate performance and high-temperature cycle performance of the battery.