28results about How to "Reduce DC resistance" patented technology

The invention provides a lithium ion battery and a preparation method and application thereof, the lithium ion battery comprises: a positive pole piece, the positive pole piece comprises a lithium supplement agent, the lithium supplement agent comprises elemental boron; a negative pole piece; the diaphragm is arranged between the positive pole piece and the negative pole piece; and the electrolyte is filled among the positive pole piece, the negative pole piece and the diaphragm. According to the lithium ion battery as well as the preparation method and the application thereof provided by the invention, a relatively high positive electrode lithium supplementing effect can be achieved in various battery systems under the condition that gas production is not deteriorated, and the cycle performance of the lithium ion battery is improved.

The invention discloses a high-magnification and high-capacity resin-based hard carbon material as well as a preparation method and application thereof, and belongs to the technical field of hard carbon materials. The preparation method comprises the following steps: dispersing carbon nanotubes in resin or a resin precursor to obtain carbon nanotube resin; and carbonizing the carbon nanotube resin to obtain the high-magnification and high-capacity resin-based hard carbon material. The carbon nanotubes are added into the resin, so that the conductivity and the structural stability of the high-rate and high-capacity resin-based hard carbon material can be enhanced, and when the high-rate and high-capacity resin-based hard carbon material is applied to a battery and used as an active substance of a battery negative electrode, the alternating-current resistance and the direct-current resistance of the battery can be reduced, the positive electrode capacity and the rate performance of the battery can be improved, and the cycle life can be prolonged; the battery calorific value is reduced.

The invention discloses a U-shaped coil inductor and a production method thereof, and the method comprises the following steps: S1, cutting a copper sheet into a required size through a punching machine, and bending the copper sheet into a U-shaped coil; s2, the U-shaped coil is placed on a lower punching die with the opening facing downwards, and an electrode of the U-shaped coil is placed in a groove of the lower punching die; s3, feeding the alloy powder into a mold, and applying pressure to press the alloy powder and the U-shaped coil into an inductor; s4, putting the inductor into an oven for baking; s5, uniformly covering the inductor with an organic coating through spraying equipment to form a protective layer; and S6, stripping the protective layer of the exposed electrode of the inductor by using laser, and plating a tin layer on the electrode through electroplating. The U-shaped coil has the beneficial effects that the U-shaped coil is formed by bending the copper sheet, the structure is simple, automatic generation and processing are facilitated, and the production efficiency is improved; the U-shaped coil and the magnetic powder block are pressed and integrally formed, the volume is small, the magnetic powder block can be easily integrated into a circuit, the design of the circuit is more compact, and the requirement for high integration of components is met.

The invention relates to the technical field of batteries, in particular to a surface modification method of a positive electrode. The surface modification method of the positive electrode provided by the invention comprises the following steps that an aluminum source, a carbon nano tube and the positive electrode are mixed and calcined, the surface-modified positive electrode is obtained, the addition amount of the aluminum source is 300 ppm to 900 ppm, and the addition amount of the carbon nano tube is 300 ppm to 900 ppm according to the mass of the positive electrode. The surface of the positive electrode material is modified by coating the positive electrode material with the carbon nanotubes and the aluminum source, on one hand, contact between the positive electrode material and an electrolyte can be isolated to a great extent, and the cycle performance of the material is improved, and on the other hand, the mixture formed by the carbon nanotubes and the aluminum source has good rapid ion and electron transmission performance, and has good electrochemical performance. The migration rate of lithium ions can be improved, the direct-current resistance of the positive electrode material can be reduced, and meanwhile, the increase of the direct-current resistance in the circulation process is inhibited.

The application discloses a negative pole piece and a lithium ion battery, and relates to the technical field of batteries, and specifically discloses a negative pole piece and a lithium ion battery. The negative pole piece comprises a current collector, a first coating layer and a second coating layer which are stacked on at least one side of the current collector; the first coating layer and the second coating layer each comprise a negative active material, a first binder, a second binder, a first conductive agent and a second conductive agent; and the preparation of the negative pole piece satisfies the following conditions: 2≤C2 / C1≤4 and 1.05≤X / Y≤1.25, wherein C1 and C2 are the mass proportions of the first conductive agent in the first coating layer and the second coating layer respectively, and X and Y are the solid contents of the first coating layer slurry and the second coating layer slurry respectively. According to the application, the solid content of the slurry, the proportions of different active materials and conductive agents are designed and controlled in the double-coating pole piece, and the designed proportions satisfy a certain functional relationship, so that the ion conductivity of the battery can be effectively improved while the high conductivity of the pole piece is maintained, the direct-current internal resistance of the pole piece in the charging and discharging process is reduced, the rate charging and discharging performance is improved, and the lithium precipitation window is widened.

The invention provides a negative pole piece, a secondary battery and an electric device. The negative electrode plate comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector, and the negative electrode film layer comprises a binder; wherein the negative electrode film layer comprises a first area and a second area, the mass ratio of the binder in the first area to the binder in the second area is 0.1-1.4, and the first area is an area where the surface of one side, far away from the negative electrode current collector, of the negative electrode film layer extends towards the interior of the negative electrode film layer by a distance within h / 2, and the second area is an area where the surface of the other side extends towards the interior of the negative electrode film layer by a distance within h / 2. The second area is an area where the surface of one side, close to the negative current collector, of the negative electrode film layer extends to the first area by a distance within h / 2, h represents the thickness of the negative electrode film layer, and the negative electrode piece is subjected to flame heating treatment.

The invention discloses an isolation chip and an isolation system. The isolation chip includes a primary side frame, a secondary side frame, a first die, and a second die. The first tube core is connected with the primary side frame, the second tube core is connected with the secondary side frame, and the primary side frame and the secondary side frame form a three-tap transformer. According to the three-tap transformer, the frame body of the isolation chip serves as the three-tap transformer, the frame body has a larger sectional area, the coil direct-current impedance can be directly reduced, heat loss in the current transmission process is reduced, electromagnetic interference can be restrained through differential transmission of the three-tap isolation coil, and the isolation efficiency is improved.

The invention provides a secondary battery and an electronic device. The secondary battery comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive material layer arranged on at least one surface of the positive current collector, and the negative pole piece comprises a negative current collector and a negative material layer arranged on at least one surface of the negative current collector; the single-side coating weight a1 of the positive electrode material layer is 45-120g / m < 2 >; the single-side coating weight a2 of the negative electrode material layer is 15-50g / m < 2 >; the ratio of a1 to a2 is (1.4-3): 1. The secondary battery provided by the invention has better high-temperature performance and low-temperature performance, namely, the secondary battery has high capacity recovery rate at high temperature and smaller direct current resistance (DCR) at low temperature.

The present invention belongs to the technical field of battery electrolyte additives, and proposes a technical solution for the application of dioxazolone compounds in battery electrolytes. The battery electrolyte includes an organic solvent, a lithium salt, and an additive. The additive includes a mass ratio of 1: (0.2-0.5) dioxazolone compounds and an amount of dioxazolone compounds of 2-10% of the mass of the battery electrolyte; the structural formula of the dioxazolone compound is: or R is a methyl, phenyl or fluorine-substituted phenyl, and R1 and R2 are not hydrogen or methyl at the same time. Through the above technical solution, the problem that the battery electrolyte is not resistant to high pressure in the prior art is solved.

The present application relates to a method for preparing a negative electrode of a secondary battery, comprising: (1) dispersing silicon nanoparticles into a carbonizable polymer melt to form a mixture containing silicon nanoparticles and a carbonizable polymer melt; (2) casting the mixture to form a carbonizable polymer film containing silicon nanoparticles; (3) stretching the carbonizable polymer film to form a carbonizable polymer film with a mesh structure containing voids inside; and (4) carbonizing the carbonizable polymer film formed in step (3) to obtain the negative electrode of the secondary battery. In the present application, the method can continuously produce a self-supporting carbon-coated silicon secondary battery negative electrode, which has no rebound problem and has its own supporting structure, providing space for the expansion of the pole piece during the later aging process, thereby solving the problem of cracks that may occur in the pole piece.

This invention discloses a multilayer integrated winding method for Litz coils on printed circuit boards, belonging to the field of power electronics technology. The invention includes: providing a PCB with at least four conductive layers; forming input / output cutout areas at the edge of the PCB; dividing multiple parallel conductors constituting one turn of the coil into multiple groups, each group starting from the same layer; each conductor sequentially traversing all conductive layers through vias in a predetermined order, extending circumferentially at a predetermined angle in each layer, so that the current paths of all conductors are uniformly distributed in a direction perpendicular to the coil plane; the input and output ends of all parallel conductors are led out from the cutout areas. This invention increases the number of PCB layers available for a single-turn coil to 4, 6, or more, significantly improving current carrying capacity; the input / output cutouts are concentrated in small-angle areas, reducing the end area occupied; each conductor only needs to undergo a minimum number of position exchanges within the cross-sectional area, reducing wiring complexity and making it suitable for the integrated design of magnetic components.

The invention provides a negative pole piece, a secondary battery and an electric device. The negative electrode plate comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector, and the negative electrode film layer comprises a binder; wherein the negative electrode film layer comprises a first area and a second area, the mass ratio of the binder in the first area to the binder in the second area is 0.1-1.4, and the first area is an area where the surface of one side, far away from the negative electrode current collector, of the negative electrode film layer extends towards the interior of the negative electrode film layer by a distance within h / 2, and the second area is an area where the surface of the other side extends towards the interior of the negative electrode film layer by a distance within h / 2. The second area is an area where the surface of one side, close to the negative current collector, of the negative electrode film layer extends to the first area by a distance within h / 2, h represents the thickness of the negative electrode film layer, and the negative electrode piece is subjected to laser heating treatment.

The invention provides power supply equipment, power receiving equipment and an Ethernet power supply system, and belongs to the technical field of Ethernet power supply. In the scheme provided by the invention, the positive electrode of the direct-current power supply end in the power supply equipment and the positive electrode of the direct-current power supply end in the power receiving equipment are connected with the center tap of the transformer, the negative electrode of the direct-current power supply end is connected with the shielding layer of the shielding differential line, and the two signal lines in the shielding differential line are connected with the two ends of the transformer. Based on the connection mode, the two signal lines in the shielding differential line can be connected in parallel, so that the direct-current resistance of the shielding differential line is effectively reduced. Therefore, the power loss and the voltage loss of the shielding differential line can be effectively reduced.

This invention discloses a method for preparing a high-density patch inductor blank, relating to the field of patch power inductors. In the prefabrication process, the patch inductor blank undergoes a first-stage pressing and a second-stage pressing. During the first-stage pressing, the current positions of the upper die head and the second lower die head are kept constant. The first lower die head is activated and controlled to press upwards at a first preset pressure. When the powder height on the periphery of the cavity is higher than a preset dimension of powder height at the center of the cavity, the second-stage pressing begins. During the second-stage pressing, the first lower die head continues to press at the first preset pressure, while the upper die head and the second lower die head are activated and controlled to press downwards and upwards respectively at a second preset pressure. When the powder height on the periphery of the cavity is equal to the powder height at the center of the cavity, the pressing pressure of the first lower die head is adjusted to the second preset pressure and held, resulting in a patch inductor blank. This method significantly improves the compaction density and permeability of the inductor blank.

This application provides a secondary battery, a battery pack, and an electronic device. The secondary battery includes an electrode assembly. At least one side of the negative electrode current collector of the negative electrode assembly includes an active material layer coated area covered by a negative active material layer and an uncoated active material layer area not covered by the negative active material layer. The direction from the coated active material layer area to the uncoated active material layer area is a first direction. A reinforcing layer covers a portion of the uncoated active material layer area. The uncoated active material layer area includes a tab, and the tab has reinforcing ribs, a portion of which overlaps with the reinforcing layer. The above technical solution of this application can at least prevent wrinkling of the uncoated active material layer area of ​​the negative electrode current collector, improving the support for the tab.

The invention provides an inductor and a preparation method and application thereof, the inductor comprises a coil which is spirally wound in a layered mode, and gaps between layers of the coil are filled with magnetic powder. According to the inductor provided by the invention, the gaps between the layers of the coil which is spirally wound in a layered manner are filled with the magnetic powder, so that the inductance value is improved, the direct-current resistance of the inductor is reduced, and the efficiency of the inductor is improved; according to the inductor, the problem that the efficiency of the inductor cannot be effectively improved due to the fact that the lacquering film is not resistant to high temperature is solved.

The present invention discloses a composite graphite coating, a graphite composite material, and a preparation method and application thereof. The preparation method of the composite graphite coating comprises the following steps: (1) subjecting a mixture of single-particle artificial graphite A and coating agent A to heat treatment to obtain single-particle artificial graphite B; the coating agent A is asphalt and / or anthracene oil; the asphalt includes coal tar pitch and / or petroleum asphalt; (2) subjecting a mixture of single-particle artificial graphite B and coating agent B to carbonization to obtain a composite graphite coating; the coating agent B is one or more of asphalt, anthracene oil and resin; the asphalt includes coal tar pitch and / or petroleum asphalt; the carbonization temperature is 1200-1700°C. The graphite composite material containing the composite graphite coating of the present invention has the characteristics of a dense surface coating structure, and exhibits better first discharge efficiency, capacity retention rate and rate performance when used as a negative electrode material in lithium-ion batteries.

An electric reactor adopting a central column separation structure comprises a first iron core and a second iron core, the first iron core is fixedly connected with the second iron core, the central iron core is fixedly arranged between the first iron core and the second iron core, an insulating material is arranged between the central iron core and the first iron core, and the insulating material is arranged between the central iron core and the second iron core. An insulating material is arranged between the center iron core and the second iron core, the center iron core is of a split structure, air gaps are formed between the center iron core and the first iron core and between the center iron core and the second iron core through the insulating material, compared with a traditional EI structure, a better filtering effect is achieved, the side face of the center iron core is covered with an insulating material, and the insulating distance between the center iron core and the coil is greatly shortened. The length of the coil is greatly reduced, the material cost is reduced, the direct-current resistance of the coil is reduced, and the copper loss is reduced.

The present disclosure provides a coil electronic component including a support member, a coil disposed on the support member, and a body surrounding the support member and the coil and containing a magnetic material. The coil includes an inner coil and an outer coil sequentially disposed on the support member, where the outer coil is electrically connected to the inner coil. The ratio of the sectional area of each turn of the inner coil to the sectional area of each turn of the outer coil is larger than or equal to 1100 / 1150 and smaller than or equal to 1200 / 1150.

The invention provides a stator of a flat wire motor, which comprises a stator core and a flat wire winding, the number of winding slots of the stator core is 48, the number of poles of the flat wire winding is 8, the number of winding slots of each pole and each phase of the stator core is 2, the number L of layers formed by the flat wire winding in the winding slots is an even number greater than 2, the flat wire winding of each phase comprises four branches, and the branches are parallel to each other. Each branch is wound in the form of a continuous wave winding; the winding of each branch circuit is subjected to continuous cross-layer wire embedding between the first layer and the Lth layer and traverses each pole in the circumferential direction, the interval between the adjacent slots embedded between the radial outermost layer or the radial innermost layer of the winding of each branch circuit is 5, and the intervals between the adjacent slots embedded between the other layers of the winding of each branch circuit are all 6. The winding structure of the stator of the flat wire motor is simple, the end size is small, the resistance of the winding is reduced, the loss of the motor can be reduced, and the operation efficiency of the motor is improved. No welding point exists in the flat wire of each branch, so that the reliability of the winding can be improved.

The invention relates to the technical field of electrode materials, in particular to a negative electrode binder, a preparation method of the negative electrode binder and an electrode slice, and the negative electrode binder is prepared from the following effective components in parts by weight: 1-40.0 parts of oligomeric butadiene; 1 to 50.0 parts of ethyoxyl ethyoxyl ethyl acrylate; 1 to 40.0 parts of an ethylenically unsaturated carboxylic acid substance; 1 to 50.0 parts of an unsaturated water-soluble monomer; 1 to 60.0 parts of an unsaturated oil soluble monomer; 0.2 to 20.0 parts of an emulsifier; 0.1 to 10.0 parts of an initiator; and 1 to 40.0 parts of a pH regulator. The main component of the negative electrode binder provided by the invention is a water-based modified acrylic polymer, when the negative electrode binder is applied to the lithium battery, the direct-current resistance and alternating-current impedance can be remarkably reduced, the fast charging performance of the battery is improved, and the negative electrode binder has excellent processability and excellent flexibility and can meet the requirements of a fast charging technology.

The invention relates to the technical field of inductors, in particular to an integrated pressed inductor and a production process thereof. When the E-shaped magnetic core and the I-shaped magnetic core are fixed into a whole, a containing cavity is formed in the E-shaped magnetic core and the I-shaped magnetic core, the E-shaped magnetic core comprises a bottom plate and a middle column arranged on the bottom plate, the bottom plate is provided with an annular groove, and the annular groove surrounds the peripheral face of the lower portion of the middle column. The coil is arranged in the containing cavity and comprises a winding part formed by winding a wire with an insulating layer and a leading-out part led out from the winding part, the surface of the leading-out part is exposed out of the surface of the forming body, the leading-out part comprises two terminals, and the two terminals extend in opposite directions on the two sides of the coil; the coil is hollow and is sleeved on the peripheral surface of the middle column, and the adhesive is arranged in the groove and at the joint of the I-shaped magnetic core and the E-shaped magnetic core, so that the coil is prevented from falling off, the service life of the coil is prolonged, and the coil with a larger wire diameter is favorably used, so that lower direct-current impedance is achieved, and the effect of stabilizing current is better.

The application discloses an electrode pole piece and a preparation method thereof, a secondary battery and an electric device. The electrode pole piece comprises a current collector and an active material layer which is compounded on the surface of the current collector. The raw material for preparing the active material layer comprises a sublimation agent, the sublimation agent is composed of water and a sublimation aid, the mass of the sublimation aid accounts for 10-30% of the mass of the sublimation agent, and the sublimation aid is iodine and / or an alcohol with a melting point between-10 DEG C and 10 DEG C. The application can overcome the defect that the above-mentioned sublimation pore-forming process cannot be carried out under conventional conditions, is favorable for reducing energy consumption and cost, saving resources, and has the advantages of being green, environment-friendly and excellent in pore-forming effect.

An inductor component (10) is provided with a green body (11), a first insulating layer (31), a lower layer inductor wiring (51L), and an upper layer inductor wiring (51U). The lower layer inductor wiring (51L) is provided with a lower layer wiring main body (52L) and a lower layer protruding portion (53L) protruding from the outer surface of the lower layer wiring main body (52L) on the third negative direction (Z2) side. The outer surface of the lower layer wiring body (52L) on the third negative direction (Z2) side is in contact with the outer surface of the first insulating layer (31) on the third positive direction (Z1) side. The lower layer protruding portion (53L) is located within a range surrounded by an outer edge of the lower layer wiring main body (52L) and extends along the lower layer wiring main body (52L) when viewed in the third positive direction (Z1). The outer surface of the upper layer inductor wiring (51U) on the third negative direction (Z2) side is in contact with the surface of the lower layer inductor wiring (51L) on the third positive direction (Z1) side.

The invention provides a lithium ion battery electrolyte and application thereof. The electrolyte comprises: a non-aqueous solvent; the lithium salt comprises lithium bis (fluorosulfonyl) imide; and an additive, the additive comprising a first additive, and the first additive comprising diethyl cyanomethylphosphonate. According to the lithium ion battery electrolyte and the application thereof provided by the invention, the corrosion of an aluminum foil current collector can be effectively prevented, the gas production performance of a lithium ion battery is improved, and the cycle performance and the quick charge performance of the battery are improved.

A copper-iron co-fired inductor and its preparation method are disclosed. The copper-iron co-fired inductor comprises: a square magnetic core, the surface of which is covered with an insulating layer; two flat copper wires, which are arranged parallel to each other on the surface of the magnetic core covered with the insulating layer and adhere to three adjacent faces of the square magnetic core, with the ends of the flat copper wires extending to adhere to a fourth face of the square magnetic core; and a shielding layer, which is adhered to the three surfaces of the square magnetic core with the flat copper wires attached, and is pressed together with the square magnetic core, the insulating layer, and the flat copper wires to form an integrated blank. The blank is then co-fired and sintered to form the copper-iron co-fired inductor. The present invention also provides a method for preparing the copper-iron co-fired inductor. The copper-iron co-fired inductor of the present invention, through the design of the aluminum nitride insulating layer, parallel flat copper wires, and iron-silicon-aluminum shielding layer, greatly improves heat dissipation performance.

The invention belongs to the technical field of transformer winding, and particularly relates to a winding method of a low-power transformer, which comprises the following steps of: determining the number N of secondary windings of the transformer according to circuit parameters; the number of winding turns of the primary winding is Nm, and the number of winding turns of each secondary winding is N1, N2... Nn; the flexible circuit board is used for replacing an enameled wire or a flat wire to wind the transformer, the number of windings is achieved through the number of layers of the circuit board, the winding number is obviously reduced, pins are led out in advance, additional bending during welding is not needed, and the transformer is suitable for large-scale rapid production; compared with a traditional enameled wire or flat wire winding mode, the winding method has the advantages that the direct current resistance (DCR) of an inductance coil is obviously reduced, inductance loss is reduced, heating is reduced, the coupling effect between windings is good, leakage flux is small, energy loss of a transformer is reduced, and therefore efficiency is improved. The transformer wound by the method is better in performance and high in consistency, and the method is easy to operate and high in yield.

Provided is a positive electrode active material with which it is possible to reduce the DC resistance and improve the charge / discharge cycle characteristics of a secondary battery. A positive electrode active material which is characterized by containing a composite material that contains a lithium transition metal composite oxide and a carbonaceous coating film formed on the surface of the lithium transition metal composite oxide, and a metal oxide that contains at least one of W, Mo and Nb, the carbonaceous coating film contains an alkali metal and / or an alkaline earth metal excluding Li.