91results about "Winding capacitor machines" patented technology

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll. The method may include providing a multi-roll calender system comprising a first calender roll, a second calender roll; rotating the first calendering roll at a first rotational velocity; rotating the second calendering roll at a second rotational velocity; providing a first dry electrode material to a first nip between the first calendering roll and the second calendering roll to form a dry electrode film. The second rotational velocity may be greater than the first rotational velocity.

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll. 62385256

To provide a power storage element in which generation of a gap between electrodes is suppressed.SOLUTION: A power storage element comprises a wound electrode body 2 having a flat shape and a winding core 6 disposed in a central part of the wound electrode body. The winding core has a flat shape formed by winding a belt-like sheet member and including two folding positions 7A and 7B. The winding core 6 includes a cylindrical part 8 and inner peripheral margin parts 9A and 9B which are disposed inside of the cylindrical part and in which only one end is fixed to the cylindrical part. A length of the inner peripheral margin parts is shorter than a distance from fixing positions 10A and 10B with the cylindrical part 8 to the folding position at a farther side with respect to the fixing positions.SELECTED DRAWING: Figure 2

The invention relates to the technical field of film winding equipment, in particular to a winding device of a metallized film capacitor, which comprises a rack and a winding roller rotationally mounted in the rack, and a winding control mechanism is arranged in the rack and used for controlling the sample injection direction of a film relative to a film roll when the film is wound; a tension roller is arranged in the machine frame, and an adjusting mechanism is arranged between the tension roller and the winding control mechanism and used for controlling the position of the tension roller. The tension roller and the winding control mechanism are arranged on the rack, so that the position of the guide roller is automatically adjusted when the thickness of a film roll is increased, a to-be-wound film and the film roll are always in a tangent state, the influence of tension can be effectively reduced, the tensile deformation of the film is reduced, and the production efficiency is improved. The size stability is improved; and the winding compactness uniformity of the film is improved.

The utility model discloses a winding machine with good stability for capacitor processing, which relates to the technical field of winding machines and comprises a support frame, a first feeding shaft, a transmission shaft, a heating piece and an air drying piece, and the first feeding shaft, the transmission shaft, the heating piece and the air drying piece are mounted on the surface of the support frame. And a stabilizing piece is installed on the surface of the supporting frame, a second feeding shaft is arranged on the surface of the supporting frame, a cutter is arranged on the surface of the supporting frame, and a damping piece is arranged at the bottom of the supporting frame. Hot air is conveyed through the air heater, air of the air heater is conveyed through the fan cover, the air is blown to a roll film, residual water vapor is evaporated again, dust on the roll film is blown, the quality of the roll film is guaranteed, the upper portion of the roll film is pressed through the pressure sensing block, and the roll film is prevented from being damaged. The lower portion of the rolled film is controlled through the pressing wheels on the fixing columns, the rolled film is conveyed in a limited mode, and displacement of the rolled film in the conveying process is prevented.

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll. The method may include providing a multi-roll calender system comprising a first calender roll, a second calender roll; rotating the first calendering roll at a first rotational velocity; rotating the second calendering roll at a second rotational velocity; providing a first dry electrode material to a first nip between the first calendering roll and the second calendering roll to form a dry electrode film. The second rotational velocity may be greater than the first rotational velocity.

The invention provides an external automatic deviation rectifying device and capacitor winding equipment, the external automatic deviation rectifying device is used for being arranged on the outer side of a capacitor winding machine, the external automatic deviation rectifying device comprises a rack part and a deviation rectifying part arranged on the rack part, and the deviation rectifying part comprises a driving device, a driving device, a deviation rectifying device and a control device; the driving device is used for being in shaft driving connection with a pole foil discharging disc in the capacitor winding machine; the position detection device is used for detecting offset information of the electrode foil located in the foil guide channel; and the controller is used for controlling the axial movement of the electrode foil discharging disc shaft according to the deviation information so as to correct the position of the electrode foil, so that the existing manual deviation correction type capacitor winding machine has an automatic deviation correction function of the electrode foil, and meanwhile, structural transformation or repurchase of a new capacitor winding machine on the existing manual deviation correction type capacitor is not needed. The improvement cost of the capacitor winding machine is reduced, and the situation that an existing manual correction type capacitor winding machine is idle and wasted is also avoided.

A laminated film which has a resin layer on at least one surface of a resin substrate, and wherein M represents the peak intensity of fragments of positive ions that exhibit the maximum intensity and are detected when the surface of the resin layer is analyzed by time-of-flight secondary ion mass spectrometry, when T is the sum of the peak intensity of the positive ions of the alkali metal element and the peak intensity of the positive ions of the alkaline earth metal element, T / M is 0.001-0.100, and the tape peel strength is 2.0 N / 19 mm or less. Provided is a laminated film that suppresses deterioration in element performance when used as a process film for a constituent member of an electronic component or a battery, such as a laminated ceramic capacitor.

The invention discloses processing equipment for capacitor elements, the processing equipment comprises a rack, a plurality of unwinding rollers, winding rollers and an alignment assembly, the unwinding rollers are rotatably arranged on the vertical side wall of the rack in parallel, and the winding rollers are rotatably arranged on the side wall, provided with the unwinding rollers, of the rack; a driving part used for driving the unwinding roller and the winding roller to rotate is arranged on the rack, the alignment assembly is arranged on the rack and comprises an alignment plate and a guide rod, the alignment plate is vertically arranged on the side, provided with the unwinding roller, of the rack in parallel, and a plurality of first communicating openings are formed in the alignment plate; the multiple first communicating ports and the multiple unwinding rollers are arranged in a one-to-one correspondence mode, the unwinding rollers are slidably connected with the alignment plate through the first communicating ports, and the guide rod is perpendicularly arranged on the side, close to the rack, of the alignment plate. The method has the effect of improving the processing quality and the processing precision of the capacitor element.

A production apparatus of an electrode active material layer, comprising: a support unit; a feeding unit that feeds prescribed granulated particles on or above the support unit; a first conveying unit; a squeegee unit; a first stock guide; a second stock guide; a first position measurement unit; a second position measurement unit; a rolling unit; a first gap amount adjustment unit; a second gap amount adjustment unit; and a control unit, wherein: the first position measurement unit is capable of measuring a distance D1; the second position measurement unit is capable of measuring a distance D2; the first gap amount adjustment unit adjusting a gap amount G1; and the second gap amount adjustment unit adjusting a gap amount G2. The control unit causes the first gap amount adjustment unit to adjust the gap amount G1 based on a difference between the gap amount G1 obtained based on the distance D1 and a gap amount threshold T1 and causes the second gap amount adjustment unit to adjust the gap amount G2 based on a difference between the gap amount G2 obtained based on the distance D2 and a gap amount threshold T2.

A power storage element according to one aspect of the present invention comprises a wound-type electrode body having a negative electrode and a positive electrode, and a sealable flat container for accommodating the electrode body. The electrode body has a winding core in the center, the compressive strength of the material constituting the winding core is 55 MPa or more, and the inside of the container is in a state of negative pressure.

The invention discloses an aluminum electrolytic capacitor for automotive electronics and a preparation method of the aluminum electrolytic capacitor. The capacitor comprises a core package formed by winding an anode foil, a cathode foil and electrolytic paper, and an electrolyte impregnated in the core package. The electrolyte comprises a solvent, a solute and an additive, the solvent contains ethylene glycol monoalkyl ether, and the additive contains phosphotungstic acid. The preparation method comprises the steps of riveting, element winding, drying treatment, electrolyte impregnation, packaging, aging and the like, wherein the impregnation rate is controlled to be 1.31-1.51 in the electrolyte impregnation step. Through the optimized electrolyte formula and strict process control, the high-frequency ESR of the capacitor is remarkably reduced, the hydration corrosion of an anode oxide film is effectively inhibited, the high-temperature resistance and the mechanical vibration reliability are improved, and the harsh application requirements in the field of automotive electronics are completely met.

The present application relates to the technical field of capacitor production equipment, and particularly relates to a paper pasting module; the paper pasting module comprises a feeding unit, a traction unit, a cutting unit and a paper pasting unit; the traction unit is arranged downstream of the feeding unit; the traction unit comprises a sliding table driving source, a linear sliding table and a chuck; the chuck is arranged on the linear sliding table; the sliding table driving source drives the linear sliding table to move back and forth; the chuck is used for clamping the end of the diaphragm material belt supplied from the feeding unit; the cutting unit is arranged below the traction unit and close to the feeding unit; the cutting unit is used for cutting the diaphragm material belt pulled to the position by the traction unit, so as to obtain a single diaphragm paper; the paper pasting unit is arranged below the traction unit; the paper pasting unit is arranged between the cutting unit and the chuck; the paper pasting unit pastes the single diaphragm to a target workpiece; the cutting, clamping and pasting processes are continuously connected without idle stroke; the paper pasting does not need secondary transfer; the pasting precision is stable and reliable; and the technical problem of low efficiency of the existing equipment is effectively solved.

A production apparatus of an electrode active material layer, comprising: a support unit; a feeding unit that feeds prescribed granulated particles on or above the support unit; a first conveying unit; a squeegee device; and a rolling unit, wherein: the squeegee device includes at least one cylindrical squeegee roll, two or more stock guides that are in a plate shape and have a shaft hole, a rotation shaft that is inserted into the stock guide and that penetrates the at least one squeegee roll in an axial direction of the squeegee roll, and a fixing member that restricts movement of the stock guides in an axial direction of the rotation shaft; the stock guides and the at least one squeegee roll are alternately disposed along the axial direction of the rotation shaft, and the stock guides are disposed at both ends of the at least one squeegee roll in the axial direction one each; the at least one squeegee roll is fixed to the rotation shaft; and the rotation shaft is freely rotatable with respect to the stock guides.

The utility model relates to the technical field of capacitors, in particular to a winding machine for an aluminum electrolytic capacitor, which comprises a casing, a support assembly arranged in the casing and at least two cutting assemblies embedded in the support assembly. The two cutting assemblies each comprise a cutting piece embedded in the fixing hole of the supporting assembly, a movable piece embedded in the convex hole of the supporting assembly, at least two connecting ropes embedded in the cutting piece and extending towards the movable piece, and an adjusting piece embedded in the end, away from the cutting piece, of each connecting rope. When the adjusting piece moves, the cutting piece is driven to move together through the connecting rope, so that when the diameter of the element reaches the required size, the movable pieces at the two ends drive the cutting piece to move through the driving rod and the adjusting piece, and a blade of the cutting piece cuts off the adjacent positive electrode aluminum foil or negative electrode aluminum foil. The cutting assembly does not need to be controlled by electric power, but is controlled by the diameters of the elements, so that the condition that the diameters of the elements produced in the same batch are different is avoided.

The invention discloses an aluminum electrolytic capacitor based on a ripple-resistant electrolyte and a preparation method thereof, and relates to the technical field of aluminum electrolytic capacitors. Comprising the following preparation steps: placing electrolytic paper between an anode foil and a cathode foil, winding to obtain a core, immersing the core in a ripple-resistant electrolyte for impregnation treatment, sealing the core after impregnation, putting the core into an aluminum shell, sealing the top with a rubber plug, and aging; the ripple-resistant electrolyte comprises the following raw materials in parts by mass: 40-60 parts of ethylene glycol, 3-5 parts of ammonium adipate, 1-5 parts of ammonium formate, 18-25 parts of an ammonium salt solution, 1.5-3 parts of composite polyester polyol, 3-6 parts of an additive, 1-3 parts of a flash fire improver, 0.5-1 part of a hydrogen elimination agent and 15-20 parts of deionized water.

A core member to be disposed on a winding shaft of an electricity storage element of an electricity storage device, which can increase the production efficiency of the electricity storage device, is provided. A core member disposed on a winding shaft portion of an electricity storage element of an electricity storage device, The surface of the winding core member on the side of the electric storage element is formed of a metal adhesive resin layer.

Capacitor (1) comprising a dielectric layer (2) which is uniform, wherein the dielectric layer (2) contains polyamide-imide and a first electrode (3) is arranged directly adjacent to the dielectric layer (2).

The utility model relates to the field of capacitor elements, and discloses a capacitor element winding ending shaping mechanism which comprises a winding machining part, a driving winding roller is rotationally arranged in the middle of the front end face of the winding machining part, a pole plate material is wound on the outer surface of the driving winding roller, and a plurality of fixed supporting plates are fixedly installed in the middles of the two sides of the winding machining part. Movable supports are movably installed on the portions, on the two sides of the winding machining part, of the outer surface of the fixed supporting plate, the portions, between the winding machining part and the movable supports, of the outer surface of the fixed supporting plate are sleeved with contraction springs, installation plates are symmetrically and fixedly connected to one sides of the movable supports, and electric telescopic rods are installed in the installation plates; according to the device, the cutting edge of the polar plate material is clamped through the clamping plate, so that the effect of conveniently limiting and fixing the tail end of the cut polar plate material is achieved, the overall tightness of the rolled polar plate material is improved, the problem of overall looseness of the rolled and cut polar plate material is solved, and the overall machining efficiency of the polar plate material is improved.

The invention belongs to the technical field of thin film capacitor production and manufacturing, and particularly relates to thin film capacitor core heat setting equipment which comprises a rack, a power assembly, a hot pressing assembly and a housing, and the power assembly drives the hot pressing assembly to move in the vertical direction. The hot-pressing assembly is composed of a follow-up platform, a plurality of middle platforms and a base platform, a plurality of hot-pressing spaces are formed among the platforms, and heat setting treatment can be carried out on the multi-layer thin-film capacitor core body at the same time. Heating holes are formed in the follow-up platform, the middle platform and the base platform, and high-heat-conduction temperature equalizing layers are arranged in the follow-up platform, the middle platform and the base platform and used for improving the heat transverse diffusion capacity and ensuring the temperature uniformity of all hot-pressing areas. Forming trays are arranged on the middle platform and the base platform to limit the core body, and pressing plate units capable of being elastically adjusted are arranged below the follow-up platform and the middle platform, so that partition independent stress pressing is achieved. According to the invention, the consistency, stability and production efficiency of heat setting of the thin-film capacitor core can be effectively improved, and the method is suitable for large-scale application.

The invention provides a winding method of a CVT capacitive voltage divider and a winding system based on the CVT capacitive voltage divider, and the method comprises the steps: S10, obtaining a first aluminum foil and a second aluminum foil, and carrying out the double-side edge folding processing of the first aluminum foil and the second aluminum foil; s20, laminating the first aluminum foil subjected to edge folding treatment, first capacitor paper and a first lower isolating membrane to form a first aluminum foil membrane group; s30, laminating the second aluminum foil subjected to edge folding treatment with a first upper isolating membrane, second capacitor paper and a second lower isolating membrane to form a second aluminum foil membrane group; and S40, after the second upper isolation film is clamped by the opposite compression roller, the second aluminum foil film group and the first aluminum foil film group are stacked and wound on the capacitor winding shaft. According to the winding method of the CVT capacitive voltage divider provided by the invention, the capacitor roll can obtain better tightening force in a mode of laminating the two aluminum foil film groups through the second upper isolating film, and the two aluminum foil film groups do not need to bear excessive tension, so that the wound capacitive voltage divider is shaped and is not easy to deform.

The invention discloses an automatic belt connecting and replacing device which comprises a rack, a belt replacing module, a belt cutting module and a rubberizing module, the belt replacing module, the belt cutting module and the rubberizing module are sequentially arranged on the rack in the conveying direction of a material belt, the rubberizing module comprises a rubberizing adsorption table and a rubberizing mechanism, and the rubberizing adsorption table is fixedly arranged on the rack; the belt replacing module comprises a plurality of belt replacing adsorption tables, a belt replacing moving support and a belt replacing driving mechanism, the belt replacing adsorption tables are fixedly arranged on the belt replacing moving support in the vertical direction of a material belt, and the belt replacing moving support is movably arranged on the rack; the belt replacing driving mechanism is connected with and drives the belt replacing movable support to move in the vertical direction of the material belt so as to select one belt replacing adsorption table to be aligned with the rubberizing adsorption table. The automatic belt connecting and replacing device can automatically complete automatic belt replacing and automatic belt connecting of the front and back material belts. The invention further discloses an automatic belt connecting and replacing method and capacitor processing equipment based on the automatic belt connecting and replacing device.

A composite aluminum electrolytic capacitor comprises an aluminum shell, a core package and a sealing piece, the core package is arranged in the aluminum shell in a sealed mode through the sealing piece, the core package comprises an anode foil and a cathode film, the cathode film comprises an insulating base film and a metalized film, and the metalized film is formed on the base film in an evaporation mode; and the cathode film is electrically connected with the cathode lead-out assembly. According to the invention, the cathode film is used for replacing traditional aluminum foil, so that the volume of the core package is reduced, and the problem of short circuit caused by the fact that electrolytic paper is punctured by burrs in the core package of a traditional aluminum electrolytic capacitor can be effectively solved. Meanwhile, the cathode guide chaff is connected with the cathode film extending out of the bottom of the core cladding through ultrasonic welding or conductive rubber, so that the electric conduction area between the cathode guide chaff and the cathode film is large, the ESR value and ESL value of a product under high frequency can be effectively reduced, and the requirement of the high-frequency product is met.

The utility model belongs to the technical field of metallized polypropylene film production, and particularly relates to a metallized film heat setting device which comprises a drying oven, a plurality of driven rollers which are rotationally connected are transversely arranged in a working bin of the drying oven, and the driven rollers are arranged at intervals in the depth direction of the working bin of the drying oven. A transversely-arranged driving roller is further rotationally connected between the driven rollers arranged at intervals, and a driving mechanism arranged on the drying oven can drive the driving roller to rotate in the same direction. According to the utility model, the driving mechanism arranged on the drying oven drives the driving roller arranged between the driven rollers to rotate, so that when a capacitor core body formed by winding a metalized polypropylene film is erected between the driven rollers and the driving roller, the capacitor core body can be subjected to heat setting while rotating through the rotation of the driving roller; therefore, the heating uniformity of the capacitor core can be effectively improved, and the production quality of the capacitor core can be improved.

To provide a winding device that can more reliably prevent collision of tabs with an outer peripheral surface of a transfer roller, and can effectively prevent breaking of the tabs.SOLUTION: A winding device comprises a rotatable winding core, and electrode sheets 4, 5 having tabs 4b, 5b are supplied to the winding core while being accelerated or decelerated. The winding device includes a rotatable transfer roller 711, an outer peripheral surface of which is covered by the electrode sheets 4, 5, and that defines a conveyance path of the electrode sheets 4, 5, and a position adjustment part 712 that can adjust the position of the transfer roller 711 along a rotation axis direction of the transfer roller 711. The position adjustment part 712 adjusts the relative positional relationship between the transfer roller 711 and the electrode sheets 4, 5 covering the transfer roller 711, so that valley parts 4c, 5c of the electrode sheets 4, 5 protrude from width directional edge 711e of the outer peripheral surface of the transfer roller 711.SELECTED DRAWING: Figure 10

The invention relates to the technical field of capacitors, and particularly discloses an anti-high-frequency large-current metallized film resonant capacitor, which comprises a capacitor roll core, the capacitor roll core comprises a first electrode layer and a second electrode layer, the first electrode layer comprises a first base film, a first metal layer and a second metal layer, and the second electrode layer comprises a second base film. A first gap is formed between the first metal layer and the second metal layer, the second electrode layer comprises a second base film, a third metal layer and a fourth metal layer, the third metal layer and the fourth metal layer are arranged on the second base film, a second gap is formed between the third metal layer and the fourth metal layer, and the first gap and the second gap are arranged in a staggered mode in the width direction of the first electrode layer. And the metal layers are matched to form a plurality of groups of capacitor unit structures connected in series. Through a plurality of groups of capacitor unit structures which are connected in series, the voltage and current impact borne by a single group of capacitors is effectively reduced, and the overall high-frequency-resistant and large-current-resistant performance is improved; dislocation gap arrangement can avoid local breakdown risks caused by alignment of adjacent layers of electrodes, and the insulation reliability is enhanced.

The invention relates to the technical field of transformer processing, in particular to a foil reloading and conveying device for a foil winding machine, which comprises a first support frame, a feeding mechanism, a connecting mechanism and a tensioning mechanism, the first support frames are distributed left and right; the feeding mechanism comprises a driving roller, a driven roller, a first motor and a conveying belt. The conveying belt is further provided with a plurality of evenly-distributed supporting bases so that the roll type foil can be loaded and moved to a preset position. The fixing frame is further provided with a bearing structure used for driving the foil to conduct rotary conveying operation. The connecting mechanism comprises a second supporting frame, a first roller and a second motor. A connecting piece is further arranged on the second supporting frame and located on the right side of the first roller so that welding and grinding operation of the ends of the two adjacent rolls of foil can be completed. The tensioning mechanism comprises a tensioning frame, a second roller, a third roller and a fourth roller. The device is reasonable in structural design, the efficient operation of foil material changing, connecting and polishing treatment can be achieved, and meanwhile the conveying operation of automatically adjusting the foil material conveying tension force and intelligently correcting is further completed.

The invention discloses a variable tension control method for winding a high-capacity capacitor core, which belongs to the technical field of capacitor core winding and comprises the following steps of: establishing a tension curve; defining the following parameters: a tension preset value, a real-time sampling tension value, equipment tension deviation and material tension deviation; and the processor carries out calculation and processing, and corrects the tension value in the tension curve in real time to complete deviation correction until all winding work of the corresponding metallized film is completed. The tension curve is established through the tension mathematical model, specific deviation correction calculation and judgment are carried out according to the real-time sampling tension value, the tension preset value, the equipment tension deviation and the material tension deviation, tension roller control parameters with smaller errors are output in real time, accurate control and continuous output of variable tension are guaranteed, and the control precision is improved. The problems of poor core winding forming and overlarge capacity deviation caused by overlarge tension jitter due to deviation are avoided, and the core winding consistency and the product quality of the high-capacity capacitor are improved.

The invention relates to the technical field of intelligent logistics, and discloses a multifunctional AGV (Automatic Guided Vehicle) supercapacitor process and an electric quantity management and control method, and the method comprises the steps: winding: employing an ultrathin diaphragm with the thickness of 10-15 [mu] m, and calculating and adjusting the slicing length; the initial tension is controlled to be 5-8 N, the electrode plate and the diaphragm are wound, and the winding diameter is gradually reduced to 3-5 N along with increase of the winding diameter till a specified winding core is achieved; liquid injection: baking the battery cell in vacuum, and pumping the interior of the battery cell into a negative-pressure vacuum interval through a high-vacuum pipeline; rapidly pumping 90%-95% of electrolyte into the battery cell in a negative pressure manner; finally, a small amount of liquid is supplemented until the specified liquid injection amount is reached; and aging: enabling the electrolyte in the battery cell to reach a boiling point by adopting a high-low temperature impact mode, and then performing constant-voltage charging at high temperature and high pressure to complete aging. By means of the characteristics of rapid charging and long cycle life of the super capacitor, the AGV trolley has the advantages of rapid charging, efficient operation and long service life, the electric quantity is controllable, charging is controllable, and the anxiety problem of repeated calculation and endurance mileage is avoided.

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll.