50results about How to "Uniform current distribution" patented technology

The invention provides a varied doping high-reliability planar gate silicon carbide VDMOS and a preparation method thereof, and the method comprises the steps: depositing metal on the lower side surface of a silicon carbide substrate, and forming a drain metal layer; epitaxially growing on the upper side surface of the silicon carbide substrate to form a drift layer; a barrier layer is formed, etching and ion implantation are carried out, and a first N-type region, a second N-type region and a P-type well region are formed; a barrier layer is formed again, etching and ion implantation are carried out, and an N-type source region is formed; a barrier layer is formed again, etching and ion implantation are carried out, and a third N-type region is formed; a barrier layer is formed again, and a gate dielectric layer is formed through etching and deposition; and re-forming a barrier layer, etching, depositing metal, forming a gate metal layer and a source metal layer, and removing the barrier layer to complete preparation. The transverse layout of the on-resistance of the device is accurately controlled, so that the current is uniformly distributed in the device, heat concentration is avoided, and the reliability of the device is improved.

The utility model provides an internal current-sharing trench gate silicon carbide VDMOS. The internal current-sharing trench gate silicon carbide VDMOS is characterized in that the lower side surface of a drift layer is connected to a silicon carbide substrate; the lower side of the buffer is connected to the upper side of the drift layer; the lower side surface of the well region is connected to the upper side surface of the buffer region; the lower side surface of the P-type source region is connected to the upper side surface of the well region; the lower side surface of the N-type source region is connected to the upper side surface of the well region; one side surface of the N-type source region is connected to one side surface of the P-type source region; the lower part of the gate dielectric layer is arranged in the groove, one side surface of the gate dielectric layer is connected to the other side surface of the N-type source region, and a groove is formed in the gate dielectric layer; the source metal layer is respectively connected with the P-type source region and the N-type source region; the gate metal layer is arranged in the groove; and the drain metal layer is connected to the lower side surface of the silicon carbide substrate, so that the overall on-resistance is lower, and the heat distribution is more uniform.

The utility model discloses reflow soldering equipment and a heating wire device thereof, and relates to the technical field of reflow soldering, and the heating wire device comprises a fixing frame and a three-phase heating wire assembly. The fixing frame comprises a fixing plate and a supporting structure, the supporting structure is detachably connected to the fixing plate, the three-phase heating wire assembly is installed on the supporting structure, one end of the three-phase heating wire assembly is fixed to the fixing plate and connected with the power line, and the other end of the three-phase heating wire assembly is fixed to the fixing plate and connected with the fixing plate through a conducting strip. Therefore, a three-phase star-shaped wiring structure is formed. The heating wire device adopts a three-phase star-shaped wiring structure, the current distribution of the wiring structure is more uniform, the voltage loss is effectively reduced, the service life of the heating wire structure is prolonged, meanwhile, the wiring circuit is shorter, and the cable cost is effectively saved; meanwhile, the fixing frame cancels a welding process, so that the assembly is simpler, the manufacturing difficulty is reduced, the time and the labor cost are effectively saved, and very high economic benefits are achieved.

The invention provides a negative electrode material, a preparation method thereof and an all-solid-state battery comprising the negative electrode material. An oxygen-containing heterocyclic substance is taken as a monomer, metal salt is added, ring-opening polymerization of the oxygen-containing heterocyclic monomer is initiated on at least one surface of a negative pole piece under the action of an initiator, and a gel functional layer containing the metal salt is formed. On one hand, the gel functional layer can be used as a buffer layer, so that the problem of poor contact of a solid-solid interface is effectively relieved, gaps at the interface are reduced, current distribution is uniform, and deposition of lithium ions at the interface is reduced; and on the other hand, the metal salt can react with lithium deposited at the interface to form substances including lithium magnesium alloy, lithium fluoride and the like, so that the nucleation overpotential of lithium is further reduced, the high ionic conductivity of the battery is improved, lithium dendrites are prevented from being formed, the electrochemical performance of the battery is improved, and the service life of the battery is prolonged.

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.

This invention relates to a stacked high-temperature superconducting cable with transposition joints and non-twisted strips. The stacked high-temperature superconducting cable includes a transposition joint section and a simple stacking section; the transposition joint section and the simple stacking section are connected; the strip includes a bridged portion and a main body connected to the bridged portion; the transposition joint section includes a bridging tape group and the bridged portion of the strip; the simple stacking section includes the main body of two strips; the main body of each strip includes the main body of multiple stacked strips; the main body of the two strips are arranged side by side. Compared with the prior art, this invention achieves the transposition of the strips in the cable through the design of stacked strips and welded transposition joints, solving the problem of inductance imbalance between each strip after winding the coil in a simple stacked cable; secondly, this invention eliminates the need for spiral twisting of the strips or extensive cutting of the superconducting strips in the manufacturing process, making the manufacturing process simple and economically cost-effective.

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.

The utility model relates to IPM packaging technical field especially a kind of double-sided heat dissipation high-power IPM packaging structure of circular symmetry distribution, including upper copper ceramic substrate and lower copper ceramic substrate, the upper copper ceramic substrate is connected with lower copper ceramic substrate by IPM module, the material quality of upper copper ceramic substrate ceramic layer and lower copper ceramic substrate ceramic layer is all aluminium nitride ceramic or aluminium oxide ceramic, the upper copper layer of upper copper ceramic substrate is connected with upper radiator by upper heat-conducting silicone grease layer, the lower copper layer of lower copper ceramic substrate is connected with lower radiator by lower heat-conducting silicone grease layer.The utility model's double-sided heat dissipation high-power IPM packaging structure of circular symmetry distribution, by upper and lower two copper ceramic substrates, buffer layer, copper column realize the electrical connection of each part in module, so that module overall packaging structure is simplified, and realizes double-sided heat dissipation, can substantially improve module heat dissipation performance, to enhance the service life of module.

The invention provides a high-capacity 21700 lithium ion battery, a preparation method of the high-capacity 21700 lithium ion battery and power-related equipment, and relates to the field of lithium ion batteries. The 21700 lithium ion battery provided by the invention comprises a positive pole piece and a negative pole piece, 6-25 positive pole lugs are arranged at one end of an empty foil of the positive pole piece, and 6-25 negative pole lugs are arranged at one end of an empty foil of the negative pole piece. According to the high-capacity 21700 lithium ion battery provided by the invention, the current flow capacity can be enhanced, the current flow capacity in the charging and discharging processes can be remarkably enhanced, the safety and the stability can be improved, local overheating and potential safety risks are reduced, the battery can still keep stable performance output under the high-load condition, and the service life of the battery is prolonged. And the requirements of various complex application scenes are met.

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 utility model relates to a gate associated transistor with a groove-type gate polycrystalline silicon structure, which is characterized in that an N-type low-resistivity layer is arranged on the lower layer of the gate associated transistor, a plurality of parallel strip-shaped N-type emitter regions with high doping concentration are arranged on the upper surface of a silicon substrate slice of an N-type high-resistivity layer is arranged on the upper layer of the gate associated transistor, and a doped polycrystalline silicon layer is connected onto the emitter regions. A groove of the groove type gate region is filled with polycrystalline silicon. Compared with the prior art, the gate associated transistor has the advantage that the failure rate is reduced by one order of magnitude.

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 discloses a perovskite structure mixed ion-electron conductor material and application thereof in a lithium battery, and belongs to the technical field of lithium batteries. The general formula of the material is Li [alpha] Sr [beta] X [x] Ta1-y-zYyZzO3, wherein 0.12 < = alpha < = 0.56, 0.3 < = beta < = 0.44, 0.56 < = alpha + beta + x < = 1, 0.11 < = z < = 0.23, and 0.11 < = y + z < = 0.50. Enough free electrons are obtained in a mode of embedding and reducing the variable valence element Z by the metal lithium, and the conductivity property of the electrons is obtained. The mixed conductor has high ionic conductivity, high electronic conductivity can be obtained in an in-situ or ex-situ mode through lithium intercalation, and the interface stability and rate capability are improved. The method can be applied to an electrode interface, such as a filling electrode active particle gap and a negative electrode / electrolyte interface layer in a battery, and can be applied to devices such as a lithium ion battery, a metal lithium battery and an all-solid-state lithium battery.

Method 300 for detecting a faulty sub-switch having at least one switching element 206 and at least one actuating element 205 and contained in a switching device 100, the method having the steps: a providing 302 a first switch 119.1 comprising at least one first single-pool-side sub-switch 120 and at least one first vehicle-side sub-switch 122, b providing 304 a second switch 119.2 comprising at least one second single-pool-side sub-switch 124 and at least one second vehicle-side sub-switch 126, c connecting 306 in series at least one first single-pool-side sub-switch 120 with at least one first vehicle-side sub-switch 122 with formation of a first center point 208, d connecting 308 in series at least one second single-pool-side sub-switch 124 with at least one second vehicle-side sub-switch 126 with formation of a second center point 210, e checking 310 whether the voltage drops over the sub-switches 120, 122, 124, 126 are identical, f measuring 312.1 and checking 312.2 the voltage difference 116 between the first center point 208 and the second center point 210.

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 application discloses a non-equivalent electrode propulsion structure and method based on electrode corrosion rules, and belongs to the technical field of base plate glass manufacturing, which comprises electrodes, silver plates arranged between the electrodes, and propulsion modules arranged at the tail ends of the electrodes; the electrodes are composed of a plurality of electrode blocks, electrode blocks with the same or similar corrosion amounts form an electrode module; different electrode modules are provided with corresponding silver plate modules and propulsion modules; a corrosion amount calculation model of each electrode block of the electrode under different temperatures is established, and then the total propulsion amount of each electrode block during operation is calculated; meanwhile, electrode blocks with the same or similar corrosion amounts form an electrode module, the silver plate module and the propulsion module are designed according to different electrode modules, the non-equivalent and differentiated propulsion of the electrode blocks in the electrode is realized, the contact surface between the electrode and the glass liquid is ensured to be a plane at all times, the uniform distribution of the electrode and the glass liquid current is realized, the efficient utilization of each electrode block is realized, the service life of the electrode is prolonged, and the cost is reduced.

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 invention discloses a safe gel lithium ion battery diaphragm, a preparation method thereof and a gel lithium ion battery, and belongs to the technical field of lithium batteries, the key point of the technical scheme is that the preparation method of the safe gel lithium ion battery diaphragm comprises the following preparation steps: S1, adding sulfate lignin into N, N-dimethyl formamide, and stirring to obtain a mixture; carrying out ultrasonic dispersion in N, N-dimethylformamide to form a sulfate lignin suspension; s2, the diamine and sulfate lignin suspension is added into N, N-dimethylformamide to be stirred to be dissolved, dianhydride is added to be stirred to obtain a spinning solution, the weight ratio of diamine to dianhydride is 1: (1.9-2.1), and the adding amount of sulfate lignin accounts for 10%-30% of the total amount of diamine and dianhydride; and S3, spinning the spinning solution to obtain a composite fiber membrane, drying the composite fiber membrane until N, N-dimethylformamide is completely volatilized, performing imidization treatment, and cooling to room temperature to obtain the lithium ion battery diaphragm, thereby achieving the effect of improving the thermal stability of the lithium ion battery diaphragm.

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 present application provides a battery cell, a battery device and an electric device. The battery cell includes an electrode assembly, the electrode assembly includes a first pole piece, the first pole piece includes a first body and a plurality of first pole ears, the first pole ear is connected to one end of the first body along the first direction, and the plurality of first pole ears are arranged at equal intervals along the winding direction of the first pole piece; all the first pole ears are stacked along the second direction and form a first common stacking area, in a projection plane perpendicular to the second direction, the orthographic projections of the areas of any two first pole ears located in the first common stacking area overlap, in the first common stacking area, two adjacent first pole ears are connected, in the projection plane perpendicular to the second direction, the ratio of the orthographic projection area of ​​the first common stacking area to the orthographic projection area of ​​any first pole ear is greater than or equal to 0.5, which is conducive to uniform current density distribution and better firmness of connection between each first pole ear and connection between each stacked first pole ear and electrode lead-out portion.

The utility model discloses a water-cooling charging pile cable, which comprises a group of power wire cores, and is characterized by further comprising a signal wire core, a group of control wire cores, a liquid cooling pipe, a shielding layer and an outer sheath. The power wire cores are divided into three types, namely a main power wire core, a second main power wire core and a third main power wire core. The main power wire core, the second main power wire core, the third main power wire core, the signal wire core, the control wire core and the liquid cooling pipe are twisted to form a cable, and then tinned copper wires are braided outside to form a shielding layer, wherein the braiding density is greater than 80%. And the outer sheath is made of a PET material and is extruded outside the shielding layer.

The invention discloses a short-circuit-resistant, heat-resistant and energy-saving busbar, belonging to the technical field of busbars. The short-circuit-resistant, heat-resistant and energy-saving busbar of the invention comprises a copper-clad aluminum tube layer, a shielding layer and an insulating layer, wherein the aluminum layer is a hollow aluminum tube with a thickness of 6 to 8 mm, the copper layer is tightly mechanically combined with the aluminum layer, the wall thickness of the copper layer is 2 to 3 mm, the thickness of the shielding layer is 4 to 5 mm, the thickness of the insulating layer is 5 to 7 mm, and the insulating layer comprises, by weight, 100 parts of silane-modified silicone rubber, 20 to 50 parts of fumed silica, and a low molecular weight organic silicon compound. 2 to 5 parts, 10 to 30 parts of polyetheretherketone, 5 to 15 parts of mullite, and 2 to 8 parts of barium titanate. The silane-modified silicone rubber is an epoxidized silicone rubber grafted with a fluorosilane coupling agent and an aminosilane coupling agent; the silicone rubber is a methyl vinyl silicone rubber, and the vinyl content of the methyl vinyl silicone rubber is ≥1.8 mol%; the mass ratio of the aminosilane coupling agent to the fluorosilane coupling agent is (2 to 3):1, and the amount of the aminosilane coupling agent and the fluorosilane coupling agent added is 50 to 70 mol% of the vinyl content of the silicone rubber.

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.

The utility model belongs to the field of capacitors, and particularly relates to a super capacitor cover, which comprises a cover and two riveting units arranged on the cover. The two riveting units are a riveting positive electrode riveting unit and a riveting negative electrode riveting unit; each riveting unit comprises a terminal, at least two positioning holes formed in the terminal, and rivets corresponding to the positioning holes; and the terminal is riveted with the cover through a rivet on the positioning hole. According to the super capacitor cover, a multi-rivet structure is adopted, the riveting stability is higher, the heavy current passing capacity is stronger, the current distribution is more uniform, a multi-loop structure is adopted, the product resistance is effectively reduced, the process is simple and mature, the total material and manufacturing cost of the cover is lower, the production and popularization are facilitated, and the super capacitor cover has great production practice significance.