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| Number | Title | Issue Date |
| 6258479 | Method for determining amount of water to be added to a NiCd cell Deficiencies in the electrolyte level of the cells of NiCd battery can be detected by measuring the internal resistance of the cells. Initially, data is collected for a battery type and capacity, correlating measured internal resistance with the amount of... | 07/10/2001 |
| 6222284 | Multiphase power supply with series connected power cells with failed cell bypass A high output level is maintained in power supplies having multiple cells in each leg. Failed cells in any leg are bypassed to provide a current path through the respective leg. All of the unfailed cells are utilized while maintaining equal magnitude betw... | 04/24/2001 |
| 6211650 | Battery cell by-pass circuit The invention is a circuit and method of limiting the charging voltage applied to an individual cell of a plurality of cells making up a battery being charged in series. It is particularly designed for use with batteries that can be damaged by overchargin... | 04/03/2001 |
| 6181106 | Sequential high-rate charging of battery cells In a preferred embodiment, a sequential high-rate battery charger for charging a battery having a plurality of cell units, the battery charger including a current source; an apparatus to selectively sequentially connect each of the plurality of cell units... | 01/30/2001 |
| 6172505 | Electronic battery tester An apparatus for electronically testing or monitoring the condition of a storage battery is provided. The apparatus includes an inductance cancellation circuit for use in a Kelvin probe of an electronic battery tester. The induction cancellation circuit r... | 01/09/2001 |
| 6165646 | Solid state rechargeable lithium battery, stacking battery, and charging method of same A solid-state secondary lithium battery with excellent charge and discharge cycle characteristics, using a negative electrode active material which shows discontinuous change of potential caused by the lithium ion insertion and extraction reactions, where... | 12/26/2000 |
| 6140820 | Measuring cell voltages of a fuel cell stack A system that is usable with a stack of fuel cells that have cell terminals includes scanning units and a circuit. The scanning units are coupled to the stack and establish different groups of the fuel cells. Each scanning unit has a ground that is refere... | 10/31/2000 |
| 6107777 | Circuit for causing a voltage step in a multi-cell battery A circuit for causing a voltage step in a battery of a plurality of serially-connected cells is provided. The circuit causes one or more of the cells to discharge through a resistor at a higher rate than the other cells, thus producing a voltage step when... | 08/22/2000 |
| 6087806 | Electric vehicle There is disclosed an electric vehicle comprising: a power reception section for receiving electric power energy from a power supply section disposed along a road, the electric power supplied by a charger disposed at a predetermined place; a coupling mech... | 07/11/2000 |
| 6051955 | Protection circuit and battery unit A protection circuit is used for a battery unit which has a plurality of cell parts coupled in parallel, and first and second power supplying terminals, where each of the cell parts includes a plurality of battery cells coupled in series, and first and se... | 04/18/2000 |
| 6014013 | Battery charge management architecture A system for managing the operation of a battery such as a lithium ion battery having a plurality of serially connected individual cells comprises a bypass module electrically in parallel with each individual cell or, alternatively, with at least one of t... | 01/11/2000 |
| 6002237 | Microcontrolled battery charger A battery charger for fast charging batteries, such as batteries requiring constant current charging, such as lithium ion batteries. The battery charger provides charging voltages across a battery pack having at least one rechargeable cell connected to ba... | 12/14/1999 |
| 5998966 | Microcontrolled battery charger A battery charger for use with different types of batteries, such as batteries requiring constant current charging, such as nickel cadmium (NiCd) and nickel metal hydride (NiMH) batteries, as well as batteries which not only require constant current charg... | 12/07/1999 |
| 5977748 | Storage capacitor power supply and method of operating same A storage capacitor power supply has a plurality of electric double layer capacitors connected in series. Each capacitor has connected in parallel therewith a charge-limiting circuit. Each charge-limiting circuit measures a voltage across its correspondin... | 11/02/1999 |
| 5969503 | Unified contactor control system for battery plant and method of operation thereof A central contactor controller for a battery plant containing a power supply couplable to a source of AC power and a battery via a bus, the bus further couplable to a load to supply power thereto, and a method of operation thereof. In one embodiment, the ... | 10/19/1999 |
| 5898291 | Battery cell bypass topology When the cell of a battery, most notably a lithium ion battery, fails and human intervention is unavailable to correct the problem. a system is provided for optimizing the energy storage capacity of the battery. At least two cellular strings, each includi... | 04/27/1999 |
| 5821757 | Noise reduction in an on-line battery impedance measurement system Connections between batteries and impedance measuring circuitry in a system for on-line measurement of battery cell impedance is effected by twisted wire triplets.... | 10/13/1998 |
| 5780991 | Multiple station charging apparatus with single charging power supply for parallel charging A charging apparatus with multiple charge stations is disclosed. The apparatus includes a single power supply which operates under the control of a microprocessor to charge a plurality of battery packs disposed in respective charging stations. Associated ... | 07/14/1998 |
| 5773959 | Lithium polymer battery charger methods and apparatus Lithium polymer battery charger methods for charging a plurality of equal charge point lithium polymer battery cells prevent overcharging of any cell, whether the cells are arranged in a series stack or are arranged in parallel. When the cells are connect... | 06/30/1998 |
| 5764030 | Microcontrolled battery charger A battery charger for use with different types of batteries, such as batteries requiring constant current charging, such as nickel cadmium (NiCd) and nickel metal hydride (NiMH) batteries, as well as batteries which not only require constant current charg... | 06/09/1998 |
| 5744936 | Electric power accumulating apparatus and electric power system In an electric power accumulating apparatus utilizing a parallel arrangement of plural groups of secondary batteries in which the secondary batteries of each group are arranged in series, an abnormality in each of the secondary batteries is detected. The ... | 04/28/1998 |
| 5656915 | Multicell battery pack bilateral power distribution unit with individual cell monitoring and control A power distribution unit (PDU) for series connected multicell battery packs which uses a common hardware platform for both charging and providing power to an external load. Using switching circuitry (2), and tap points (5a,5b,5c,5d,5e) individual access ... | 08/12/1997 |
| 5557189 | Method and apparatus including a current detector and a power source control circuit for charging a number of batteries A battery charging apparatus for charging the electricity from a current source to a cell includes a variable resistor in parallel with the cell, a cell voltage detection unit for detecting the current voltage value of the cell and a comparator for compar... | 09/17/1996 |
| 5523667 | Alkaline battery charger and method of operating same Apparatus and methods for recharging various types of battery cells are enclosed involving alternating periods of charging and discharging of the cells, a reference charge cut-off voltage, a comparator for comparing cell voltage with cut-off voltage, and ... | 06/04/1996 |
| 5422558 | Multicell battery power system A multicell battery power system for providing power to a load is disclosed. The battery power system includes a plurality of battery modules and power bus for transmitting power between the battery modules and the primary load. Each of the battery module... | 06/06/1995 |
| 5391973 | Method of charging a multiplicity of batteries A method is provided for charging a multiplicity of electrochemical storage, such as cells, cell stacks, and/or batteries. For each storage aqueous electrolytic liquids are infed and outfed at least periodically, or continuously, to and from individual an... | 02/21/1995 |
| 5387857 | Battery charging apparauts A battery charging apparatus for charging a battery which includes a plurality of battery cells connected to each other in series. The battery charging apparatus supplies an electric charge to the battery which is controlled by monitoring the terminal vol... | 02/07/1995 |
| 4987360 | Self-contained rechargeable battery power source with voltage reducer A portable, self-contained, rechargeable battery power source provides a plurality of voltage levels to a load circuit, thus allowing one source to replace the need for many batteries. The battery is a high-capacity unit of the type used in camcorders and... | 01/22/1991 |
| 4935688 | Electrical storage cell life extender The useful life of an electrolytic battery cell commonly employed in a series string as a backup power source is significantly extended by maintaining the polarization of the positive plates of such a cell at a predetermined level relative to a reference ... | 06/19/1990 |
| 4672292 | System for charging sets of rechargeable batteries The present invention relates to a system for charging a plurality of sets of rechargeable electric batteries incorporated in respective portable appliances. The system comprises, in combination: a DC constant current generator circuit (C) having first an... | 06/09/1987 |
| 4669728 | Electronic dice game An electronic dice game apparatus includes an internally powered electronic playing piece containing a random number generator which drives a visual display within the playing piece for displaying one or more numbers or dot patterns corresponding to the d... | 06/02/1987 |
| 4564798 | Battery performance control A system for controlling a multi-cell battery having a first set of the cells thereof comprising an active partition adapted for connection to a load and a second set of the cells thereof not connected to the load and comprising a passive partition. Senso... | 01/14/1986 |
| 4484140 | Battery scanning system A battery scanning system which is capable of monitoring and displaying the oltage of each cell in a battery or upon command provides the cell voltage distribution by displaying the cell number and voltage value of highest and lowest cell. The system has a... | 11/20/1984 |
| 4281277 | Dual secondary cell charging system A separable series of secondary cells is connected across a charge circuit upon the application of supply potential. When the charge potential level upon a selected portion of the secondary cell series attains a predetermined magnitude, the selected porti... | 07/28/1981 |
| 4131833 | Arrangement for tapping battery bank alternately from opposite ends Disclosed herein is a direct current motor control or energizing circuit comprising a direct current motor, a bank of series connected batteries, which bank includes opposite ends, and a switching arrangement for electrically disconnecting and connecting ... | 12/26/1978 |
| 4129817 | Stepped voltage power supply with equalized discharge of battery cells The adjacent terminals of adjacent battery cells are grouped in regularly spaced pairs of contacts. A first commutating member has a plurality of regularly spaced contact members effective to connect the contacts of each pair but one and is movable sequen... | 12/12/1978 |
