Abstract:
PROBLEM TO BE SOLVED: To provide an equalization control circuit in which a frequency of performing equalization control can be reduced, without generating a voltage difference between cells after the equalization control, by performing the equalization control of a cell voltage while considering a difference of capacitance to cell voltages of power storage cells.SOLUTION: An equalization control circuit comprises a resistor for equalization control and a switch for equalization control which are connected in parallel to a plurality of power storage cells, respectively. The equalization control circuit further comprises a cell voltage detection circuit for detecting cell voltages of the plurality of power storage cells, respectively, an equalization cell selection circuit for controlling the equalization control switch, and an arithmetic processing unit for controlling the equalization cell selection circuit. The arithmetic processing unit computes an adjustment time based on the measured cell voltages of the plurality of power storage cells and data for adjustment time computation, stored in the arithmetic processing unit beforehand, indicating a relation between the cell voltages of the power storage cells and capacitance, and performs equalization control by turning on the equalization control switch connected in parallel to an adjustment object cell to perform the equalization control thereon, among the power storage cells, just for the adjustment time.
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium ion capacitor capable of doping a prescribed amount of lithium ions to a negative electrode and/or a positive electrode in advance without any inconveniences of short-circuiting, or the like. SOLUTION: The lithium ion capacitor comprises: the positive electrode 1 in a positive electrode collector 1a having a through hole; a negative electrode 2 on a negative electrode collector 2a having a through hole; an electrolyte in the aprotic organic solvent solution of lithium salt; a lithium ion supply source 4 for supplying lithium ions carried by the negative electrode 2 and/or the positive electrode 1 in advance; and a separator 3 provided between the lithium ion supply source 4, and the positive electrode 1 and the negative electrode 2. In the lithium ion capacitor, a positive electrode active substance is a substance capable of reversibly carrying lithium ions and/or anions, a negative electrode active substance is a substance capable of reversibly carrying lithium ions, the distance between the lithium ion supply source 4 and the adjacent positive electrode 1 and/or negative electrode 2 is set to 40-120 μm, and at least two separators are clamped. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a power storage device and a sheet-like lead member in which high energy density, high output and low resistance can be obtained, and the sheet-like lead member for electrically connecting a collector and an electrode terminal can be suppressed from being ruptured and internal resistance can be suppressed from increasing in the case where vibration is applied for a long time.SOLUTION: In a power storage device, an electrode unit is configured by stacking electrode sheets via separators. Each electrode sheet is configured by forming an electrode layer on a collector in which a plurality of through holes having an average pore diameter of 300 μm or less are formed. The electrode unit and an electrolyte are contained in an exterior container, and the collectors of the electrode sheets are electrically connected with an electrode terminal which is positioned inside of the exterior container at one end and protrudes outside the exterior container at the other end, via a metallic sheet-like lead member. The sheet-like lead member can be deformed in a length direction of the sheet-like lead member and includes a buffering function with respect to an external force.
Abstract:
PROBLEM TO BE SOLVED: To provide a power storage module capable of easily connecting an electrode terminal of a power storage cell to a detector, and having high reliability.SOLUTION: The power storage module 100 formed by laminating a plurality of power storage cells 10 having electrode terminals 16, comprises a bus bar 40 electrically connecting a plurality of electrode terminals 16, a conductive member 50 fixed to the bus bar 40, a detector detecting voltages of a plurality of power storage cells 10, a wiring part electrically connected to the detector, and a wiring board 60 having a pad part connected to the wiring part, and the conductive part 50 contacts with the pad part.
Abstract:
PROBLEM TO BE SOLVED: To provide a power storage device which reduces temperature differences between multiple power storage cells and has high reliability.SOLUTION: In a power storage device 400, multiple power storage cells 10, each of which has an outer sheath 12 housing a positive electrode, a negative electrode, and an electrolytic solution, are laminated. The power storage device 400 includes heat insulation members 20 which are respectively provided between adjacent power storage cells 10. Furthermore, a heat radiation plate 40, a heat sink 50, and a cooling part (cooling fan) 60, are provided to improve heat radiation efficiency.
Abstract:
PROBLEM TO BE SOLVED: To provide an electrode capable of obtaining high adhesion between a current collector and an electrode layer; a manufacturing method of the electrode; and a power storage device having high reliability and low internal resistance.SOLUTION: The electrode 10 includes the current collector 11 having through-holes 12 and the electrode layer 15 containing an active material which is formed on at least one surface of this current collector. In the current collector, the internal surfaces of the through-holes have an average roughness of 0.1 to 30 μm measured in accordance with JIS B 0601 and also have the roughness where the number of irregularities having a height of 0.1 μm or higher from the mean line is 10 to 200 per 100 μm of the measured length, respectively, and the average particle diameter D50 of the active material is 0.15 to 9.95 μm.
Abstract:
PROBLEM TO BE SOLVED: To supply the voltage of a power storage device effectively without reducing by increasing the contact area and decreasing the resistance at a joint as compared with conventional joint by spot welding or bolting.SOLUTION: A Zn layer 21 or a Zn alloy layer, an Ni layer 22, an Sn layer 23 or an Sn alloy layer are formed by plating on the connection terminal 10a of an anode electrode composed of Al. Consequently, soldering can be made to a Cu cathode electrode composed of a dissimilar metal of Al on the Sn layer 23 or Sn alloy layer, and joint strength of the Al anode electrode and Cu cathode electrode can be enhanced. Furthermore, since the contact area is increased as compared with conventional joint by spot welding or bolting, resistance at a joint is decreased and thereby voltage drop of the connection resistance in a power storage device can be reduced.
Abstract:
PROBLEM TO BE SOLVED: To provide a wound type power storage device capable of doping lithium ions to the electrode layers of electrode sheets as a whole, in a short period, and accordingly, of obtaining high productivity. SOLUTION: In this wound-type power storage device which has an electrode wound unit wound via a separator between respective electrode sheets of a positive electrode and a negative electrode, wherein an electrode layer is formed on a current collector and has an electrolyte solution containing lithium salt, and in which to at least one electrode layer of respective electrode sheets, lithium ions are doped that are discharged from a film-shaped interior side lithium ion supply source arranged at a side farther interior than at least one innermost peripheral wound portion of respective electrode sheets and a film shaped exterior side lithium ion supply source arranged at a side farther exterior than at least one outermost peripheral wound portion of respective electrode sheets, the ratio V1/V2 between volume V1 of the interior side lithium ion supply source and volume V2 of the exterior side lithium ion supply source is in the range of 0.5-2. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an electrode for an electric storage device which can achieve a large capacitance and high reliability even when a plurality of through holes are formed through a collector, and active material layers are formed on both surfaces of the collector, to provide a method of manufacturing the same, and to provide an electric storage device element and a lithium ion capacitor which exhibit excellent performance and high productivity. SOLUTION: The electrode for the electric storage device includes a porous collector, a first active material layer formed on one surface of the porous collector, and a second active material layer formed on the other surface of the porous collector. An inner circumferential surface of at least one through hole of the plurality of through holes of the porous collector is covered with the second active material layer. The first active material layer blocks at least one through hole of the plurality of through holes of the porous collector on one surface side of the porous collector, and includes a projection protruding in one surface side direction of the porous collector in a position corresponding to the through hole. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a laminate-coating storage device, wherein a gas is reliably discharged from a specified section even if the gas is produced in a coating body of the laminate-coating storage device, and the laminate-coating storage device is obtained which has high reliability under normal use conditions. SOLUTION: The laminate-coating storage device has the coating body where mutually-laminated coating films are joined to each other at junction parts formed at outer peripheral edge in an airtight state, and a storage device element and an electrolyte are stored in a storage part in the coating body. At an outer peripheral edge of each coating film, a non-junction part is formed which has one side linked to the storage part and the other side surrounded with the junction part. In the region where the non-junction part is formed, a seal part formed by joining a portion of the coating films to each other and a hole part formed at the center position thereof and penetrating at least one coating film are formed, and the size of the one side of the non-junction part which is linked to the storage part is equal to that of one side of the storage part which is in contact with the non-junction part. COPYRIGHT: (C)2011,JPO&INPIT