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| Number | Title | Issue Date |
| 8059007 | Battery thermal event detection system using a thermally interruptible electrical conductor A method and apparatus is provided for determining when a battery, or one or more batteries within a battery pack, undergoes an undesired thermal event such as thermal runaway. The system uses a conductive member mounted in close proximity to, or in contact with, an... | 11/15/2011 |
| 7394394 | Battery monitor with wireless remote communication An apparatus and method for monitoring at least one battery condition. A ac signal is applied to a battery. A difference between a signal output from the battery and a threshold determines a battery condition. The determined battery condition is transmitted remotely... | 07/01/2008 |
| 7382270 | Method and apparatus for communication between an electronic device and a connected battery An apparatus supporting both identification of a battery type and communications over an interface between a battery and an electronic device is disclosed. The electronic device includes a processor for communicating with communications circuitry of the battery. Ide... | 06/03/2008 |
| 7363175 | Query based electronic battery tester An electronic battery tester for testing a storage battery provides a test output indicative of a condition of the battery. Electronic measurement circuitry provides a measurement output related to a condition of the battery. The battery condition is determined base... | 04/22/2008 |
| 7289578 | Wireless local area network apparatus A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the tr... | 10/30/2007 |
| 7265678 | System and method for remotely controlling low battery warnings for smoke detectors and the like An intelligent thermostat communicates with battery-powered threat detectors, such as smoke detectors, to allow remote quieting and coordination of a low battery warning detected by the threat detector. In one embodiment, the threat detector transmits a pre-warning ... | 09/04/2007 |
| 7239237 | Hand crank weather channel receiver with cell phone charger An apparatus comprising a housing. A rechargeable battery source for providing a first source of direct current, a hand-crank dynamo configured to replenish the rechargeable battery source, and a direct current input receptacle configured for receiving a second sour... | 07/03/2007 |
| 7224284 | Smoke detector calibration A method for calibrating a smoke detector includes adjusting the sensitivity of the smoke detector to get a consistent predetermined response over the expected operating range. The sensitivity is generally consistent for all detectors and an independent offset value... | 05/29/2007 |
| 7126341 | Automotive vehicle electrical system diagnostic device An automotive vehicle electrical system diagnostic apparatus includes first and second electrical connections configured to electrically couple to an electrical system of an automotive vehicle which includes a battery. Digital samples are obtained during operation o... | 10/24/2006 |
| 7113087 | Proximity sensing based on antenna impedance variation Proximity of a user body part can be detected by measuring the effects such proximity has on antenna impedance mismatches. The amount of mismatch affects the amount of RF signal energy reflected back into a transmission line connecting the antenna to a RF signal sou... | 09/26/2006 |
| 7079038 | Method and apparatus for communication between an electronic device and a connected battery An apparatus supporting both identification of a battery type and communications over an interface between a battery and an electronic device is disclosed. The electronic device includes a processor for communicating with communications circuitry of the battery. Ide... | 07/18/2006 |
| 7061207 | Cell equalizing circuit An electric circuit for equalizing voltages between serially arranged cells. The circuit is operable to generate AC voltages at amplitudes dependent on the DC voltages of the received cells. The AC voltages are all connected to an inductive coupling circuit. The ind... | 06/13/2006 |
| 7034541 | Query based electronic battery tester An electronic battery tester for testing a storage battery provides a test output indicative of a condition of the battery. Electronic measurement circuitry provides a measurement output related to a condition of the battery. The battery condition is determined base... | 04/25/2006 |
| 7010058 | Wireless local area network apparatus A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the tr... | 03/07/2006 |
| 6809649 | Method and apparatus for communication between an electronic device and a connected battery An apparatus supporting both identification of a battery type and communications over an interface between a battery and an electronic device is disclosed. The electronic device includes a processor for communicating with communications circuitry of the battery. Ide... | 10/26/2004 |
| 6677860 | Method and apparatus for end of discharge indication based on critical energy requirement A battery monitoring system and method in accordance with the principles of the present invention, a capacity of interest is determined. This capacity of interest is the useful battery capacity required for an operation of interest; that is, the battery c... | 01/13/2004 |
| 6262563 | Method and apparatus for measuring complex admittance of cells and batteries A periodic time-varying current with smallest period 1/f1 excites a cell/battery and provides a timing reference. Linear circuitry produces two signals, one proportional to the excitation current, the other proportional to the responding time-v... | 07/17/2001 |
| 6191590 | Device and a process for monitoring the state of charge of a battery A device and method for determining the state of charge of a battery includes a microprocessor-controlled arithmetic unit connected in parallel to the terminal voltage of the battery. The arithmetic unit is selectively connectable with an ohmic reference ... | 02/20/2001 |
| 6114838 | Battery capacity test method and apparatus A battery capacity tester method and apparatus are provided. The battery capacity tester determines the present internal battery impedance by measuring terminal voltages during successive applications of a known load, each load drawing a predetermined cur... | 09/05/2000 |
| 6023150 | Optimized method for determining remaining life cycles in a rechargeable battery A method (200) of estimating existing and/or remaining life cycles of a battery pack (102) having an internal battery cell (104) and battery pack circuitry (110) is based on determining an impedance value of the internal battery cell (Zcell) (104), measur... | 02/08/2000 |
| 5945829 | Midpoint battery monitoring A device for testing a battery includes circuitry adapted to measure a first conductance of a first portion of a string of cells that makes up the battery. Further circuitry is adapted to measure a second conductance of a second portion of the string of c... | 08/31/1999 |
| 5869969 | Battery charger/rectifier voltage temperature compensation circuit including protection and diagnostic scheme A temperature compensation module for use with battery charger/rectifier units. The compensation module is used to vary the battery charger output voltage as a function of temperature. This is done by controlling the series impedance of the charger's volt... | 02/09/1999 |
| 5862515 | Battery tester A battery tester is formed at an AC constant-current generator for applying an AC current for measurement to a battery BT under test via a coupling capacitor, an internal resistance detecting device for detecting the internal resistance of the battery BT ... | 01/19/1999 |
| 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 |
| 5773978 | Battery impedance monitor A battery impedance monitor includes a driver section having an oscillator which produces a pulsating loading signal which controls periodic loading of the battery to produce at its output terminals a pulsating voltage component having a peak-to-peak ampl... | 06/30/1998 |
| 5757192 | Method and apparatus for detecting a bad cell in a storage battery A method and apparatus for detecting a bad cell in a storage battery having a plurality of cells as provided. Input circuitry electrically couples to first and second terminals of the storage battery. Voltage measuring circuitry coupled to the input circu... | 05/26/1998 |
| 5717336 | Method and apparatus for determining the charge condition of an electrochemical cell A method for determining whether an electrochemical cell is substantially fully charged. The determination is made by ascertaining the rate of change of the impedance of the cell with changing frequency, at low frequency. A method for determining the stat... | 02/10/1998 |
| 5703469 | System for determining battery conditions Detected values of a voltage and a current of a battery which are supplied from a voltage and current detector are stored in a memory at a plurality of times while the battery is being discharged. A regression line calculator determines an internal resist... | 12/30/1997 |
| 5696437 | Intelligent low battery detection circuit for a paging receiver A low battery condition is determined by sampling battery terminal voltage with a voltage comparator under light and heavy loading, and indicating a low battery condition when the rate of change of the sampled voltage or the rate of change of the internal... | 12/09/1997 |
| 5675234 | Multicell battery monitoring system A continuously monitored battery operated power supply for maritime applications includes four batteries which form a parallel connected pair of banks in which the cells in each bank are series connected to each other. A Wheatstone bridge circuit connects... | 10/07/1997 |
| 5410239 | Battery charger with capacity monitor An automatic shut-off battery charging system which employs a timing control circuit (TC101) to initiate intermittent monitoring of the equivalent internal resistance of a load battery (B101) under charge, and a comparison circuit (PD101) which disables c... | 04/25/1995 |
| 5369364 | Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometric capacitance A method and apparatus for measuring the depletion level (depth of discharge) of a lithium-iodine battery in an implantable medical device. A first set of measurements are made to determine the internal impedance of the battery, and a second set of measur... | 11/29/1994 |
| 5281920 | On-line battery impedance measurement Impedance measurement of battery cells within a battery system comprising at least one string of battery cells is accomplished by dividing each of the strings into at least two portions. A loading current for measurement purposes is only imposed on a port... | 01/25/1994 |
| 5250904 | Device for predicting imminent failure of a stationary lead acid battery in a float mode A stationary battery testing device as provided for measuring imminent battery failure while the battery is in a float mode. The device includes a circuitry for measuring the internal resistance changes of a battery and then comparing them over a predeter... | 10/05/1993 |
| 5241275 | Method of measuring remaining capacity of a storage cell by comparing impedance plot characteristics The remaining capacity of a storage cell, particularly a valve regulated lead-acid cell, is determined by measuring its impedance at typically two or three relatively low frequencies f, e.g., frequencies in the approximate range of 0.001 to 1.0 Hz. In one... | 08/31/1993 |
| 5140269 | Electronic tester for assessing battery/cell capacity A self-contained electronic device instantaneously assesses the stored energy capacity of single, two-volt, lead-acid cells; or of batteries comprised of such cells. The testing device is electrically connected to the terminals of a cell or battery and me... | 08/18/1992 |
| 5119011 | Battery state of charge indicator A method for measuring and storing the state of charge of batteries, such as used in electric vehicles. The stored charge value is initially derived from the value of battery terminal voltage measured prior to connection of the battery to the load, e.g. t... | 06/02/1992 |
| 5095308 | Transceiver with battery saver and method of using same A portable transceiver has a battery saving feature which includes a timer, circuit which automatically cuts off the power supply to the receiver and transmitter for relatively long intervals and periodically turns on the power supply for relatively short... | 03/10/1992 |
| 4916438 | Battery charging, monitoring and alarm circuit Methods and circuits are provided for monitoring a battery with the monitored battery electrically connected in an operating system. A dynamic impedance characteristic of the monitored battery is identified and compared with a predefined value. An alarm s... | 04/10/1990 |
| 4890108 | Multi-channel remote control transmitter A multi-channel remote control transmitter is disclosed for control of apparatus such as vehicle security systems, garage door openers, and the like. The transmitter provides the capability of selecting one of many different channels or codes to be transm... | 12/26/1989 |
