3936 results about "Pole piece" patented technology

Disclosed are a laminated lithium ion battery, a battery pack comprising the same and a pole piece of the laminated lithium ion battery. The pole piece comprises a current collector and an active material layer, wherein the current collector is coated with the active material layer. A section of continuous uncoated area is arranged at the tail end of a first width end portion of the pole piece, the top face and the bottom face of the uncoated area are not coated with the active material layer, the current collector is exposed in the uncoated area, and the exposed current collector serves as a pole lug of the pole piece. By the pole piece, internal resistance of the lithium ion battery is reduced and heat dissipation performance of the battery is improved.

One embodiment relates to an objective lens utilizing magnetic and electrostatic fields which is configured to focus a primary electron beam onto a surface of a target substrate. The objective lens includes a magnetic pole piece and an electrostatic deflector configured within the pole piece. An electrostatic lens field is determined by the pole piece and the electrostatic deflector, and the electrostatic lens field is configured by adjusting offset voltages applied to plates of the electrostatic deflector. Other embodiments, aspects and features are also disclosed.

The present invention relates to a lithium-ion battery anode or cathode pole piece and a spreading method of the anode pole piece or the cathode pole piece, wherein, the anode pole piece and the cathode pole piece consists of a foil, a conducting adhesive thin layer and an electrode active material layer in turn; the thickness of the conducting adhesive thin layer is five to ten microns. The electrode pole piece is made in the procedures that a layer of conducting adhesive thin layer in the thickness of five to ten microns are pre-coated on the surface of the foil before the sizing agent is spread, so that a conducting adhesive thin layer having good adhesive force, good conductivity and compact structure is formed on the surface of the foil. Then the electrode active material sizing agent is spread on the conducting adhesive thin layer, and is dried under an appropriate temperature to produce a required pole piece. The present invention can reduce the surface of the foil, and can improve the wetting quality of the sizing agent, thereby improving the adhesion performance of the anode material and the collecting body (aluminum foil) so as to reduce the powder-dropping of the battery during the cycling process, and to prolong the cycling service life of the battery; moreover, the present invention can reduce the content of the adhesive agent in the sizing agent, and improve the utilization rate of the active substance, and the method of the present invention does not produce negative influence on the performance of the battery.

The invention is a magnetic transducer with separated read and write heads for perpendicular recording. The write head has a trailing shield that extends from the return pole piece toward the main pole piece to form the write gap at the air-bearing surface. One embodiment of the trailing shield is a two part structure with a pedestal and a much smaller tip that confronts the main pole piece at the gap. In one embodiment a sink of non-magnetic, electrically conductive material is disposed in the separation gap between the read head and the flux bearing pole piece. The sink is preferably made of copper and does not extend to the ABS.

The invention provides a PVDF-coated lithium-ion battery separator and a preparation method thereof. The PVDF-coated lithium-ion battery separator comprises a base film and a coating, wherein the coating coats a single side or double sides of the base film; the coating is obtained by coating and drying slurry; and the coating is 0.1-0.5 micron in thickness and contains evenly arranged PVDF spherical particles. According to the PVDF-coated lithium-ion battery separator, a traditional technology that an existing PVDF-coated lithium-ion battery separator takes oil substances of acetone and the like as solvents is abandoned. Water is adopted as the solvent of a PVDF material; and no a thickening agent is added, so that the low-viscosity water-based PVDF coating slurry is obtained; an ultra-thin coating of which the PVDF particles are regularly arranged and which is relatively loose is obtained after the slurry is coated; the ultra-thin coating improves the hardness of a pole piece and the effective utilization space of the battery when effectively bonded to the lithium-ion battery separator and the pole piece; and the ventilation loss caused by the thickness of the coating is reduced.

The invention discloses a preparation method of a lithium ion battery pole piece containing a PTC (Positive Temperature Coefficient) coating. The pole piece prepared by the method is a multilayer coated pole piece. The method comprises the following steps: before coating slurry comprising an anode or a cathode active substance onto a current collector, coating the current collector with a precoated layer with the temperature sensitivity in advance, wherein the precoated layer with the temperature sensitivity comprises ingredients of a binding agent, a positive temperature material and a conductive agent; the weight ratio of the binding agent to the positive temperature material to the conductive agent is (2-8): (1-8): (0-7). The method provided by the invention is used for preparing the lithium ion battery pole piece containing the PTC coating; the battery using the pole piece has good safety characteristics against overcharge, short circuit, squeezing, needling and the like.

The invention provides a preparation method for three-dimensional porous graphene for a supercapacitor. The preparation method comprises steps as follows: ultrasonically dispersing graphene oxide; fully mixing with a strong alkali solution; pre-drying until a surface is humidified; then activating at a vacuum environment at 120 to 180 DEG C or in protective gas atmosphere at 180 to 1200 DEG C under a high temperature; and etching the surface of the graphene to obtain a three-dimensional porous structure through high-temperature strong alkali and stream, so as to improve a specific surface area of a graphene material. According to the preparation method, activated graphene oxide is reduced through chemical reduction and high-temperature reduction methods, so as to improve a performance of activated graphene. The activated graphene and an adhesive are mixed to prepare into electrode paste based on a certain mass ratio, and the electrode paste is loaded on a conductive current collector to prepare into a supercapacitor electrode, so that a degree of agglomeration of the graphene on a pole piece can be further reduced, and a high electrochemical performance can be obtained.

An electromagnet comprising a ferromagnetic yoke which comprises a yoke. Mutually opposing first and second pole pieces are provided. The first pole piece is provided with a planar coil having a first side facing the yoke and a second side facing the yoke. A balancing member is arranged on the second side of the planar coil to counterbalance the attractive force between the planar coil and the yoke. The other pole piece may also be provided with a corresponding balancing member.

A motor including an outside rotor having a rotor disc with plural magnets alternating polarities flush mounted in the disc, an inside stator assembly with a ring of pole pieces forming a channel to house a transversely wound stator windings, and a controller coupled with feedback electronics for monitoring a timing, speed and direction and coupling a signal to a processing unit for adjusting the drive electronics driving the phase windings. A u-shaped gap above the channel to receive the rotor disc and focus the captured magnetic flux in the pole pieces toward the magnets. In an embodiment the molded magnetic flux channel pole pieces of the inside stator are sets of molded magnetic flux channel pole pieces, each set forming a channel and corresponding to one phase of the motor; and a section of each one of the transverse windings passing through one channel, the remaining section folding back outside the set in close proximity to the outer base of the set of molded magnetic flux channel pole pieces.

A write head has a second pole tip layer, a coil layer and a write coil insulation layer that are planarized at their top surfaces. A thin top insulation layer insulates the top of the coil layer from a yoke portion of the second pole piece which is connected to the second pole tip layer in the pole tip region and connected to a first pole piece layer in a back gap region. In a preferred embodiment the write gap layer extends throughout the yoke region and provides the only insulation between the first pole piece layer and the coil layer. Further, it is preferred that the write coil insulation layer be an inorganic material such as silicon dioxide (SiO2). Several embodiments of the write head are provided along with novel methods of making.

The invention relates to the field of batteries, in particular to a current collector, a pole piece using the same and a battery. The current collector comprises a PPTC (polymeric positive temperature coefficient) material layer and a metal layer, wherein the PPTC material layer is used for bearing the metal layer; the metal layer is used for bearing an electrode active material layer and is located on at least one surface of the PPTC material layer. The PPTC material layer not only is used for bearing the metal layer, but also can have a rapid resistance increasing function at the stage of temperature rising caused by overcharge and short circuiting because of characteristics of the PPTC material, and generation of joule's heat is inhibited by reducing current value. By means of the current collector, the short-circuiting safety performance because of foreign matter can be improved, and the overcharge safety performance can also be improved.

Method and device for self-regulated flux transfer from a source of magnetic energy into one or more ferromagnetic work pieces, wherein a plurality of magnets, each having at least one N-S pole pair defining a magnetization axis, are disposed in a medium having a first relative permeability, the magnets being arranged in an array in which gaps of predetermined distance are maintained between neighboring magnets in the array and in which the magnetization axes of the magnets are oriented such that immediately neighboring magnets face one another with opposite polarities, such arrangement representing a magnetic tank circuit in which internal flux paths through the medium exist between neighboring magnets and magnetic flux access portals are defined between oppositely polarized pole pieces of such neighboring magnets, and wherein at least one working circuit is created which has a reluctance that is lower than that of the magnetic tank circuit by bringing one or more of the magnetic flux access portals into close vicinity to or contact with a surface of a ferromagnetic body having a second relative permeability that is higher than the first relative permeability, whereby a limit of effective flux transfer from the magnetic tank circuit into the working circuit will be reached when the work piece approaches magnetic saturation and the reluctance of the work circuit substantially equals the reluctance of the tank circuit.

The invention relates to a power type lithium battery full-automatic production line and a production technology thereof. The power type lithium battery full-automatic production line mainly consists of a pole piece manufacturing unit, a battery assembling unit, a battery liquid injecting unit and a factory processing unit; each unit key equipment electrical control system is composed of a PLC, an industrial personal computer, a hydraulic and pneumatic component; the PLC controls each mechanism of the equipment to act in a coordinated manner; and the industrial personal computer collects data to realize the function that the data of the whole line can be stored, read and the like. The main effects lie in that mutual matching of production efficiency of each unit is realized through key debugging for production parameters, a conveyor is adopted in an intermediate link, and full automation of production process is finally realized; the production line is compatible with multi-standard battery production requirements, the production when the product is remodeled can be realized just by adjusting the equipment parameters and replacing partial work fixtures, and order form-based production requirement of the product is met; key equipment and technology on the line are independently researched and developed, the operation is reliable and stable, and the production line has higher cost performance.

A laminate tile pole piece for an MRI, a method and an apparatus for manufacturing laminate tile metal pole pieces for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric ring pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The laminate tiles are formed by unwinding a metal ribbon, guiding the ribbon through an adhesive bath, winding the ribbon on a polygonal bobbin, such as a rectangular bobbin, to form a coil with at least one flat side, removing the coil from the bobbin, cutting the coil into laminate bars and shaping the laminate bars into trapezoidal or annular sector shaped laminate tiles. The apparatus contains an adhesive bath, a polygonal shaped bobbin, bobbin side plates for guiding the ribbon onto the bobbin and pressure plates for controlling the thickness of the coil. The apparatus also contains a cutting tool for cutting the coil into laminate bars after the coil is removed from the bobbin and a water jet to shape the laminate bars into trapezoidal or annular sector shaped laminate tiles.

The invention relates to a pole piece of a positive electrode of a lithium-sulfur battery and a preparation method thereof. The pole piece takes gelatin as a binding agent to coat a positive electrode active material and a conductive additive on a current collector, thereby improving the adhesion and the dispersion of the electrode. Meanwhile, the pole piece of the positive electrode of the lithium-sulfur battery prepared by freeze-drying comprises a micro-porous structure, thereby reducing the infiltration resistance of electrolyte on the pole piece and improving the electrochemical reversibility and the cycle stability of the battery.

The invention relates to a secondary Li-ion battery and a method of preparing a negative pole piece thereof. The paste containing different negative active materials or the paste of different ratios are coated by level on the two sides of a negative current collector respectively according to a certain order to form a plurality of negative diaphragm layers, and different thickness can be used for each diaphragm layer. By controlling different active materials, ratio solutions and coating thicknesses, the change of the porosity and the resistance of each layer is controlled, the porosity of the surface diaphragm layers can be larger than that of the inner diaphragm layers, which prevents the penetration of the electrolyte in the internal core and enhances the performance of the core, and by adjusting the resistance of the surface diaphragm layers, the surface contact resistance is increased to have a function of protecting the inner diaphragm layers. Then, by the processes of cold pressing, striping, welding terminals and so on, the negative pole piece is fabricated, and thereby the secondary Li-ion battery containing the negative pole piece is fabricated.

The invention relates to a negative pole piece, which comprises a negative pole current collector and a negative pole film layer, wherein the negative pole film layer is arranged on the negative pole current collector and comprises at least two negative pole active material layers; and the at least two negative pole active material layers are sequentially arranged on the negative pole current collector from the inside to the outside according to the lithium-ion dynamic property decreasing order of the negative pole active material layers. The invention particularly relates to the negative pole film layer of which the negative pole active material is a graphite/hard carbon and/or silicon material composite material. The graphite is compounded with the hard carbon and/or silicon material, and a multi-layer gradient of which the lithium-ion dynamic property is sequentially increased from the outside to the inside is formed, so that the negative pole piece has the effects of simultaneously improving the charging capability and increasing the energy density.

An embodiment generally relates to a permanent magnet rotor arrangement. The arrangement includes a rotor having a plurality of apertures, a plurality of pole pieces, a plurality of wedges, and a plurality of permanent magnets. Each magnet is held substantially secure against the rotor by a two pole pieces of the plurality of pole pieces and an associated wedge from the plurality of wedges. Each pole piece is connected to the rotor by a fastener pulled through an associated aperture.

The invention provides a pre-lithiation method and device for negative pole pieces of a lithium-ion battery. The method comprises the steps as follows: firstly, the negative pole pieces and metal lithium pieces are sequentially immersed into an electrolyte at intervals in an inert atmosphere condition; the negative pole pieces correspond to the metal lithium pieces one by one but are not in contact with the metal lithium pieces; the negative pole pieces and the metal lithium pieces are connected with a positive electrode and a negative electrode of a power supply through leads respectively; the negative pole pieces are charged; the charging current is 0.05-2.0C; and the negative pole pieces are taken out and dried to obtain the pre-lithiated negative pole pieces. According to the pre-lithiation method and device, 'wet pre-lithiation' is adopted; the cost is low; the production security is high; the pole pieces can be evenly pre-lithiated; and the first efficiency and the energy density of the battery are improved.

An automatic weighing and sorting device comprises a machine frame, a material loading assembly, a weighing sensor, a material unloading assembly and a transportation assembly. The material loading assembly, the weighing sensor and the material unloading assembly are installed on the machine frame. After the transportation assembly enables battery pole pieces to be weighted and sorted to be transported from the material loading assembly to a weighing assembly, in a process that weighted battery pole pieces are transported to a material unloading position, the weighing sensor sends weight signals to the material unloading assembly which completes sorting of the battery pole pieces according to the weight signals. The automatic weighing and sorting device is short in time for completing the weighing and sorting processes and high in efficiency.

The invention relates to a method for recycling battery-grade iron phosphate in a lithium iron phosphate battery and preparing a lithium iron phosphate positive material by utilizing a waste lithium ion phosphate battery, and relates to a method for recycling a battery and preparing the battery positive material by utilizing the waste battery recycled material, solving the problems of the traditional method for recycling the LiFePO4 lithium ion battery positive electrode that the purity of the obtained element or substances is low and the obtained element or substances cannot be used for preparing the LiFePO4 lithium ion battery positive electrode. The method comprises the steps: I, crushing a positive pole piece, and carrying out heat treatment; II, dissolving the crushed positive pole piece in an acid solution; III, charging a surface active agent; IV, charging an alkaline solution, thereby obtaining a battery-grade iron phosphate; V, charging sodium carbonate to obtain a lithium carbonate; VI, mixing iron phosphate, lithium carbonate and a carbon source reduction agent; and VII, calcining. In the process for recycling the battery-grade iron phosphate in the lithium iron phosphate battery and preparing the lithium iron phosphate positive material by utilizing the waste lithium iron phosphate battery, no secondary pollution is produced, and the comprehensive and high-added-value recycling of the waste lithium iron phosphate battery can be realized.

The invention relates to the field of battery manufacturing mechanical technique, and provides a battery lamination stacking machine. The battery lamination stacking machine comprises a lamination platform machine, a pole piece feeding box mechanism, a secondary positioning mechanism, a lamination taking mechanical arm, a multiple lamination detection mechanism, a membrane unreeling mechanism, a membrane reeling mechanism, a membrane cutting mechanism, a rubberizing mechanism, a battery transfer mechanism and a battery conveyor belt. The lamination taking mechanical arm comprises a positive lamination taking mechanical arm and a negative lamination taking mechanical arm. The positive lamination taking mechanical arm and the negative lamination taking mechanical arm each comprise two groups of stand-by sucker and two groups of lamination sucker, and can realize simultaneous lamination stacking of a lamination mechanism A and a lamination mechanism B, and improve the efficiency of battery assembly.

A low profile non-contacting position sensor for rotational engagement with a shaft. A pole piece has a first and a second piece. A backstrap retains the first and second pieces in parallel and opposing relationship. A shaft passes through at least one of the pieces. The pole piece is held to the shaft by a shaft retainer. A first and second magnet is disposed on the first and second pieces, respectively. A magnetic sensor is positioned between the first and second magnets. A magnetic field sensor such as a hall effect sensor is positioned in an gap and operates to provide an output signal representative of the field strength of the magnet as the shaft rotates. The output signal changes magnitude in relation to the relative position of the magnet with respect to the magnetic field sensor.

The method of making a magnetic head assembly includes forming a second pole piece layer that is recessed from a head surface, forming a reactive ion etchable (RIEable) pole tip forming layer on the second pole piece layer, forming an adhesion/stop layer of tantalum (Ta) on the pole tip forming layer, forming a photoresist mask on the adhesion/stop layer with an opening for patterning the adhesion/stop layer and the pole tip forming layer with another opening, reactive ion etching (RIE) through the opening to form the other opening, forming the second pole piece pole tip in the other opening with a top which is above a top of the adhesion/stop layer and chemical mechanical polishing (CMP) the top of the second pole piece pole tip until the CMP contacts the adhesion/stop layer. The invention also includes the magnetic head made by such a process.

A stator according to the related art comprises preassembled coils that are slid onto stator pole teeth and secured to the respective stator pole tooth by means of a single part. This has the disadvantage, however, that a magnetic flux in the winding head of the exciting coil cannot be directed in defined fashion. A stator according to the invention comprises at least one pole shoe (15) that secures a coil (11) on a stator pole tooth (7).

A battery pole piece protective bracket n is entirely of a cylindrical shape. A wire passage is defined in the battery pole piece protective bracket and is axially extended through the same. At least one end surface of the battery pole piece protective bracket is provided with a protective trough recessed from the end surface for preventing contact of the battery pole piece with an external element thus further avoiding short circuit. By using entirely cylindrical shaped and axially extended wire passage, and by using a protective trough recessed from one end surface for preventing contact of the battery pole piece with an external element thus further avoiding short circuit, the battery pole piece is good insulated from external environment, no risk of short circuit exists, there is no need for attaching high temperature resistant adhesive tape or applying electric hot melt adhesive, and electronic cigarette assembling rate is increased.

The invention discloses a U-shaped automatic piece wrapping machine for pole pieces of storage batteries, comprising a piece wrapping mechanism for wrapping a first pole piece, an assembly mechanism connected with the discharge end of the piece wrapping mechanism, a first piece supply mechanism for supplying the first pole piece to the piece wrapping mechanism and a second piece supply mechanism for supplying the second pole piece to the assembly mechanism, wherein the second pole piece and the wrapped first pole piece are piled up at intervals in the assembly mechanism to form a pole group. The machine realizes automatic feeding and automatic wrapping of the pole pieces and automatic assembly of the wrapped pole pieces, completes the whole operation process in a streamline manner in one step and improves the wrapping efficiency and quality of the pole pieces. Improvement of the degree of automation is conductive to correspondingly reducing the probability of manually contacting the pole pieces, thus greatly reducing the harm of lead dust to the operators.

The invention discloses battery pole piece making and battery cell coiling integrated equipment, which comprises a rack and a control system. The center of the rack is equipped with a coiling device, which coils a positive pole piece transmitted by a positive pole piece supply device, a negative pole piece transmitted by a negative pole piece supply device, and diaphragms output by a first diaphragm supply device and a second diaphragm supply device into a battery cell according to the order of the positive pole piece, a diaphragm, the negative pole piece and a diaphragm. A secondary unloading manipulator and an unloading conveyor belt mechanism are arranged at left lower side of the coiling device. When the secondary unloading manipulator unloads, hole ironing processing is performed simultaneously, and the mode is convenient and effective. A glue wrapping mechanism of a positive lug welding device on the rack adopts a cam control structure, which has high precision and good stability. A positive lug support of the positive lug welding device passes through the rack of the equipment and is installed at the back side of the rack. A negative lug support of a negative lug welding device passes through the rack of the equipment and is installed at the back side of the rack. Thus, for the whole equipment, the layout of all the devices is more reasonable, and the overall size is decreased effectively.

The invention discloses a lithium battery with novel current collectors and a preparation method of the lithium battery with the novel current collectors. The lithium battery comprises a positive pole piece, a diaphragm and a negative pole piece. The positive pole piece comprises a novel positive pole current collector in a multi-layer structure, the positive pole current collector comprises a first plastic film, and each of upper and lower surfaces of the first plastic film is coated with a first adhesion reinforcement layer, an aluminum metal plating layer and a first antioxidant layer sequentially. The negative pole piece comprises a novel negative pole current collector in a multi-layer structure, the negative pole current collector comprises a second plastic film, and each of upper and lower surfaces of the second plastic film is coated with a second adhesion reinforcement layer, a copper metal plating layer and a second antioxidant layer sequentially. The preparation method includes: laminating the positive pole piece, the diaphragm and the negative pole piece, packaging through aluminum-plastic films, injecting an appropriate amount of electrolyte, and subjecting the aluminum-plastic films to hot-press packaging. The lithium battery has advantages that light weight, energy density improvement and cost reduction of the battery can be realized, and copper/aluminum plating layers are less prone to shedding and oxidization.

The invention discloses a forming method of lithium ion secondary batteries by using a vacuum system, and relates to a forming method of lithium ion batteries, which is characterized in that: the vacuum system is added and applied during the forming process, which leads the lithium ion secondary batteries to be capable of exhausting generated gas during the forming process, while uniform and solid electrolyte interface films (SEI film) can be formed by each part of pole pieces so as to improve the cycle performance as well as the high-rate discharge property of the lithium ion secondary batteries. In addition, the forming method of the lithium ion batteries can also solve the problems of insufficient electrolyte and the corrosion of battery shells caused by the overflow of the electrolyte during the forming process, thus saving the materials and production cost.