Class / Patent application number | Description | Number of patent applications / Date published |
324429000 | To determine load/no-load voltage | 29 |
20090184716 | Battery Voltage Detection Circuit - A battery-voltage detection circuit comprising: a first-capacitor; an operational-amplifier; a second-capacitor; a voltage-application-circuit to sequentially apply one and the other-battery-terminal-voltages to the other-first-capacitor-end; a discharge circuit to allow the second-capacitor to discharge before the other-battery-terminal-voltage is applied to the other-first-capacitor-end; a constant current circuit to output a constant-current causing predetermined-speed-discharge of electric charge accumulated in the second-capacitor in response to a discharge-start-signal input after voltage is applied to the other-first-capacitor-end; a comparator; and a measurement-circuit to measure a time-period from a time when the discharge-start-signal is input until a time when an comparator-output-signal changes to one logic level as a time-period corresponding to a battery-voltage, at least one of the operational-amplifier and the comparator being provided with an offset so that the comparator-output-signal changes to the one logic level when voltage applied to the other operational-amplifier input terminal is at a predetermined level lower than a reference-voltage level. | 07-23-2009 |
20090261836 | METHOD AND APPARATUS FOR ESTIMATING THE CHARGE/DISCHARGE ELECTRICITY AMOUNT OF SECONDARY BATTERIES - An apparatus estimates charge/discharge electricity amount without being affected by current measurement error. Under specific selection conditions, a no-load voltage calculation part uses pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data to calculate a no-load voltage V | 10-22-2009 |
20090261837 | SYSTEM AND METHOD FOR ESTIMATING A STATE VECTOR ASSOCIATED WITH A BATTERY - A system and a method for estimating a state vector associated with a battery are provided. The method includes determining a time interval that the battery has been electrically decoupled from a load circuit. The time interval starts at a first time. The method further includes obtaining a first state vector associated with the battery from a memory. The first state vector is determined prior to the first time. The method further includes calculating a second predicted state vector associated with the battery based on the first state vector and the time interval. | 10-22-2009 |
20090295397 | Systems and Methods for Determining Battery Parameters Following Active Operation of the Battery - When the load of a battery powered device is removed or significantly reduced, the voltage response may be recorded or analyzed in real time. The parameters of a battery's equivalent circuit can be found by fitting recorded or real time voltage response to a model function. The model function may describe the equivalent circuit voltage response to the load transition through equivalent circuit parameters. The model function may account for a duration of a load application prior to a transition as well as values of the load before and after the transition. Response of battery voltage to load application or load release is time dependent. Modeling of this time dependence can provide significant advantages in fuel gauging implementation, for example, to significantly reduce the waiting time before measured voltages can be used for state of charge (SOC) correlation and to improve the accuracy of the prediction of run-time for devices that drain a battery in short high-current pulses. | 12-03-2009 |
20090295398 | VOLTAGE DETECTING DEVICE FOR BATTERY MODULES - A voltage detecting device for battery modules can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The voltage detecting device for battery modules includes a plurality of switches connected to battery modules constituting a secondary battery, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the secondary battery. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the secondary battery. | 12-03-2009 |
20090295399 | On-vehicle battery condition estimation device - A battery condition estimation device estimates a pre-restart voltage drop amount ΔVjh+ΔVbn of a battery mounted to a vehicle during period T | 12-03-2009 |
20100007351 | ASSEMBLED-BATTERY VOLTAGE MEASURING DEVICE AND ASSEMBLED-BATTERY VOLTAGE SYSTEM USING IT - A voltage measuring device includes a sample-and-hold circuit which alternates between (a) a sample mode in which a signal input from a cell to be measured is sampled so that a voltage across a first capacitor becomes equal to a voltage across the cell to be measured, and a voltage across a second capacitor having its one end connected to one end of the first capacitor becomes equal to zero volts and (b) a hold mode in which the connection between the first and second capacitors is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal of an operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier, and an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal. | 01-14-2010 |
20100026308 | CIRCUIT FOR MEASURING BATTERY VOLTAGE AND METHOD FOR BATTERY VOLTAGE MEASUREMENT USING THE SAME - The present invention relates to circuit for measuring battery voltage and method for battery voltage measurement using the same. In the circuit for measuring battery voltage and method for battery voltage measurement using the same, three or more capacitors, which form a closed loop and are sequentially connected, are provided, and voltages of voltage sources are measured by using the three or more capacitors in turn, which prevents measurement errors from occurring due to residual charges in the capacitors and enables more precise measurement. Further, according to the present invention, since the three or more capacitors are alternately charged and discharged, the delay in time is decreased, and the voltages of the plurality of voltage sources can be measured at one time. Therefore, it is possible to reduce the amount of time required to measure battery voltage. | 02-04-2010 |
20100066378 | Current Mirror Potentiostat - Systems, methods, and apparatuses for measuring current flow in an electrochemical cell are disclosed. A system includes a circuit configured to output a mirrored value of an electrical current flowing through an electrochemical cell. The system may also include a voltage controller, coupled to one or more electrodes of the electrochemical cell, for controlling the voltage difference between at least two electrodes of the electrochemical cell. The system may further include a current replication circuit coupled to the voltage controller or the electrochemical cell. The current replication circuit generates a mirrored current of the electrical current flowing in the electrochemical cell. The replicated current may be measured or processed with different circuits and methods to output the current flowing through the electrochemical cell. | 03-18-2010 |
20100134115 | BATTERY MODULE VOLTAGE DETECTOR - A battery module voltage detector can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The battery module voltage detector includes a plurality of switches connected to battery modules constituting a battery pack, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the battery pack. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the battery pack. Capacitors may be connected between an output terminal of a (1+M/2)-th resistor and an N-th resistor, except a (1+m/2), the (1+M/2)-th resistor and the N-th resistor. | 06-03-2010 |
20100219837 | Method and Device for Measuring Cell Voltages in a Plurality of Series-Connected Accumulator Cells - The invention relates to a method and a device for measuring cell voltages of accumulator cells (Z | 09-02-2010 |
20100237872 | APPARATUS AND METHOD FOR SENSING LEAKAGE CURRENT OF BATTERY - An apparatus for sensing a leakage current of a battery comprises a floating capacitor charged with voltage detected from a cathode or anode terminal of a battery, a cathode terminal selection switching unit for selecting a voltage detection path for the cathode terminal and charging the floating capacitor with a detection voltage of the cathode terminal, an anode terminal selection switching unit for selecting a voltage detection path for the anode terminal and charging the floating capacitor with a detection voltage of the anode terminal, a DC voltage applying unit for applying DC voltage through the voltage detection path for the anode terminal, a voltage measuring unit for measuring the charged detection voltage of the cathode or anode terminal, and a leakage current determining unit for determining the occurrence of leakage current based on the measured detection voltages of the cathode and anode terminals. | 09-23-2010 |
20100259270 | Method for determining cell number, cell number determination device, power supply device and program - A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an “i”th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the “i”th cell and an (i−1)th cell, which is in one location higher than the “i”th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the “i”th cell with the voltage value of the “i”th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery. | 10-14-2010 |
20100271035 | BATTERY CELL VOLTAGE MEASURING APPARATUS AND METHOD - Disclosed is a battery cell voltage measuring apparatus and method. The battery cell voltage measuring apparatus comprises a plurality of floating capacitors provided corresponding to a plurality of cells contained in a battery pack; a plurality of switching units provided corresponding to each cell of the battery pack and switchable into a charge mode or a measurement mode; and a cell voltage detector for measuring the voltage of each cell by switching each switching unit into a charge mode to charge the voltage of each cell on each corresponding floating capacitor and time-differentially switching each switching unit into a measurement mode to apply the cell voltage charged on the floating capacitor between a reference potential and a common cell voltage measuring line. | 10-28-2010 |
20110006776 | METHOD OF ESTIMATING SOLID PHASE POTENTIAL - The present teachings are directed toward a machine implemented method for estimating the solid phase potentials of either positive or negative electrode of a battery. The machine implemented method includes providing battery voltage information and an estimated solid phase potential to a model coefficient updater to update a model coefficient. Battery current information is provided to a battery internal variable estimator along with the updated model coefficient so that the solid phase potentials can be determined. A multi-layer model can be utilized to determine the ion density of the electrodes. The method can be implemented on a processing device, and is particularly applicable to Li-ion batteries. | 01-13-2011 |
20110074433 | BATTERY CAPACITY DETECTION FOR MULTI BATTERY CELLS - A battery gas gauge includes a voltage detection unit and a processor. The voltage detection unit is coupled to a battery pack and can measure a plurality of open circuit voltages of a plurality of cells in the battery pack respectively. The processor is coupled to the voltage detection unit and can determine a minimum open circuit voltage of the open circuit voltages, and can determine a first relative state of charge of the battery pack based on a relationship between the minimum open circuit voltage and a corresponding relative state of charge of a cell having the minimum open circuit voltage. | 03-31-2011 |
20110234231 | DETECTING DEVICE AND DETECTING METHOD FOR MONITORING BATTERY MODULE - A detecting device and a detecting method for monitoring a battery module are provided. The battery module is electrically connected to a load and includes a first battery unit, a second battery unit and a connecting device. The connecting device connects the positive electrode of the first battery unit to the negative electrode of the second battery unit. The detecting device includes a shunt, a voltage detecting module and a control module. The shunt is serial connected between the battery module and the load to measures the load current. The voltage detecting module measures the voltage difference across the connecting device between the positive electrode and the negative electrode. The control module computes the equivalent resistance across the connecting device between the positive electrode and the negative electrode according to the load current and the voltage difference. Therefore, the hazard caused by aging of the electric circuit can be prevented by monitoring the equivalent resistance, which infers the change of the assembly quality. | 09-29-2011 |
20110273181 | BATTERY TESTING SYSTEM - The present invention allows batteries to be tested in conjunction with being re-charged, and identifies failed or failing batteries before they are put to further use. The present invention can simultaneously test and charge multiple batteries, and can simultaneously test and charge different types of batteries. A system according to various aspects of the present invention comprises a control system. The control system includes: (1) a processor, (2) a user interface in communication with the processor, and (3) a memory in communication with the processor. The memory stores instructions that, when executed by the processor, cause the processor to: identify a provided battery to be tested; and receive, through the user interface, a selection one or more tests to perform on the battery. The system further includes a battery testing system in communication with the control system. The battery testing system comprises a battery interface for coupling with the battery and is configured to perform the one or more tests on the battery. | 11-10-2011 |
20110279124 | FLOAT CURRENT MONITOR - A battery monitor device is provided for determining float current in a battery system. The battery monitor device is comprised of: a voltage sense circuit electrically coupled to opposing sides of a connector coupling two battery cells and operable to measure a voltage drop across the connector; a test load circuit that operates to apply a load across the least one battery cell and connector and measure current flow through the connector; and a controller configured to receive voltage drop measures from the voltage sense circuit and current measures from the test load circuit. The controller operates to determine a resistance of the connector and computes a float current flowing through the connector from the resistance and voltage drop measures taken only when a load is not being applied across the connector. | 11-17-2011 |
20110291660 | System and Method for Low Battery Detection - Systems and methods for monitoring a voltage pump to determine the status of a battery connected to the voltage pump are provided. The operation of the voltage pump is monitored during at least one monitoring period which corresponds to a period of relatively heavy consistent load. The operation of the voltage pump can be monitored by sampling a control signal that corresponds to the operation of the voltage pump. | 12-01-2011 |
20110309839 | DEVICE CALIBRATION FOR BATTERY TYPE IDENTIFICATION - Some embodiments provide a system that facilitates use of an electronic device. The electronic device may be a keyboard, a mouse, a trackpad, a remote control, a wireless phone, a toy, a battery charger, and/or a camera. During operation, the system measures a loaded voltage of a calibrated voltage source connected to the electronic device. To measure the loaded voltage, the calibrated voltage source is connected to a known load in the electronic device, and a voltage measurement for the calibrated voltage source is obtained using an analog-to-digital converter (ADC) in the electronic device. | 12-22-2011 |
20120019252 | THROUGH-STACK COMMUNICATION METHOD FOR FUEL CELL MONITORING CIRCUITS - A system and method for monitoring fuel cells in a fuel cell group. The system includes a sensor circuit, such as a voltage sensor circuit, that monitors a condition of the fuel cells. If the sensor circuit detects a low performing cell, then it sends a signal to a tone generator that generates a frequency signal that switches a load into and out of the cell group. A voltage sensor detects the voltage of the cell group including the frequency signal, and sends the detected voltage signal to a tone decoder that decodes the frequency signal to determine that the fuel cells are low performing. | 01-26-2012 |
20120119745 | BATTERY MONITOR WITH CORRECTION FOR INTERNAL OHMIC MEASUREMENTS OF BATTERY CELLS IN PARALLEL CONNECTED BATTERY STRINGS - A battery monitor determines an internal resistance of a battery cell of a battery having parallel connected battery strings which accounts for errors introduced by the parallel connected battery strings. When determining the internal resistance of a battery cell, the battery monitor determines a baseline intercell resistance of an intercell connecting the negative terminal of the battery cell to the positive terminal of an adjacent battery. The battery monitor then applies a momentary load across the battery cell and immediately prior to releasing the load, measures the voltage across the battery cell (loaded voltage) and the voltage across the intercell. The battery monitor then calculates the current flowing through the intercell (intercell current) by dividing the measured voltage across the intercell by the determined intercell resistance. Immediately after releasing the load, the battery monitor measures the voltage across the battery cell (recovered voltage) and determines the battery cell internal resistance by dividing the difference between the recovered voltage and the loaded voltage by the intercell current. | 05-17-2012 |
20120326725 | MONITORING APPARATUS, MONITORING CONTROL APPARATUS, POWER SUPPLY APPARATUS, MONITORING METHOD, MONITORING CONTROL METHOD, POWER STORAGE SYSTEM, ELECTRONIC APPARATUS, MOTOR-DRIVEN VEHICLE, AND ELECTRIC POWER SYSTEM - A monitoring apparatus includes a first converter that converts first analog data indicating a voltage value of each of batteries into first digital data; and a second converter that converts second analog data indicating an electric current value flowing through the plurality of batteries into second digital data. The first analog data and the second analog data are data having the same timing. | 12-27-2012 |
20140159737 | BATTERY REMAINING AMOUNT DETECTION UNIT, ELECTRIC VEHICLE, AND ELECTRIC POWER SUPPLY UNIT - A battery remaining amount detection unit includes: a voltage measurement section configured to measure a voltage of a battery; an open-circuit voltage calculation section configured to calculate an estimated open-circuit voltage; and a remaining amount detection section configured to detect a remaining amount of the battery from the estimated open-circuit voltage, in which the open-circuit voltage calculation section is configured to calculate a first voltage change amount as a voltage change amount from a no-load voltage when no load is applied to the battery and a closed-circuit voltage when a load is applied to the battery, and the open-circuit calculation section is configured to calculate the estimated open-circuit voltage based on the closed-circuit voltage of the battery and the first voltage change amount. | 06-12-2014 |
20150293183 | BATTERY MANAGEMENT DEVICE, POWER SUPPLY, AND SOC ESTIMATION METHOD - Current-integration estimation unit estimates the SOC of a battery by integrating the value of the current flowing through the battery. Open-circuit voltage estimation unit estimates the open-circuit voltage value of the battery from a value that includes at least the measured voltage value of the battery and indicates the state of the battery, and identifies the SOC corresponding to the open-circuit voltage value. In neither charged nor discharged state, SOC determination unit employs the SOC estimated by open-circuit voltage estimation unit. In charged or discharged state, SOC determination unit employs the SOC estimated by current-integration estimation unit without change or after correction using the SOC estimated by open-circuit voltage estimation unit. In parallel with the SOC estimation, SOH estimation unit estimates the SOH of the battery based on the variation value of the SOC employed by SOC determination unit and the integrated current value in the time period required for the variation. | 10-15-2015 |
20150301115 | BATTERY CONTROL DEVICE, BATTERY SYSTEM - The purpose of the present invention is to provide a battery control device that can appropriately verify the results of the estimation of the state of charge of a battery. This battery control device is provided with a charged state calculation unit that calculates the state of charge of the battery and a charged state verification unit that verifies the results of the calculation. The charged state verification unit calculates the charged state using a calculation procedure that is not being used by the charged state calculation unit. | 10-22-2015 |
20150355285 | STATE-OF-CHARGE ESTIMATION DEVICE AND STATE-OF-CHARGE ESTIMATION METHOD - A state-of-charge estimation device and method are provided that estimate a state of charge in a battery having a large polarization, requiring a long time for depolarization, and having a large charge/discharge hysteresis in its SOC-OCV characteristics. The state-of-charge estimation device includes a voltage measuring unit which measures a closed circuit voltage in a battery, a charge estimation unit which estimates a state of charge in a charge mode by referring to charge mode information that associates a closed circuit voltage with a state of charge in the battery, and a discharge estimation unit which estimates a state of charge in a discharge mode by referring to discharge mode information that associates a closed circuit voltage generated by use of a discharge pattern of the battery with a state of charge in the battery by use of the measured closed circuit voltage. | 12-10-2015 |
20160103185 | ELECTRIFIED VEHICLE BATTERY STATE-OF-CHARGE MONITORING WITH AGING COMPENSATION - Determination of an electric vehicle battery state-of-charge (SOC) based on measuring open circuit voltage is subject to error as the relationship changes over time. A method is provided for updating the relationship during aging. A charging current is applied to the battery cell. A favorable charging condition is detected in response to a predetermined charging current. A charging slope vector is compiled during the charging condition comprising a plurality of slope values over respective state-of-charge increments. A plurality of SOC-OCV slope vectors are determined corresponding to a plurality of stored SOC-OCV aging curves, each SOC-OCV slope vector comprising a plurality of slope values over equivalent state-of-charge increments. One of the stored SOC-OCV aging curves is selected having an SOC-OCV slope vector best fitting the charging slope vector for use in converting measured OCV values to battery cell SOC values. | 04-14-2016 |