Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi Astemio, Ltd

Tomonori Kanai

Mutsumi Kikuchi

Akihiko Kudo

Hikaru Miura

Akihiko Kudoh

Tomoyuki Arima

Tatsumi Yamauchi

Akihiro Machida

Akiko Tsukamoto

Akihiko Emori

Mitsuo Noda

Hiroshi Iwasawa

A cell controller includes: a balancing unit which performs balancing of states of charge of a plurality of secondary batteries by discharging or charging each of the plurality of secondary batteries; a first timer which measures an elapsed time after a start of the balancing; a receiving unit which receives a balancing command signal including information regarding balancing times for the secondary batteries; and a first control unit which controls the balancing unit on a basis of the elapsed time after the start of the balancing, and the balancing command signal, the elapsed time being measured by the first timer and the balancing command signal being received by the receiving unit, in which the receiving unit receives the information on the plurality of secondary batteries through the single balancing command signal.

Cell controller, battery controller, battery management system, and battery system

To improve reliability in balancing while suppressing power consumption during balancing. A battery management deviceincludes cell consandthat perform balancing for adjusting voltages of a plurality of battery cellsthat are secondary batteries, and a control unitthat controls the cell consand. The cell conincludes the main timerthat measures the elapsed time for stopping the cell con, and the stop management unitthat stops the cell conwhen the main timeris abnormal. In the battery management device, the battery cellthat supplies power to the main timerand the stop management unit, and the lead storage batterythat supplies power to the control unitare power supplies different from each other.

Battery management device and integrated circuit

Provided is an electromagnetic switch control device capable of stabilizing a contact pressure by predicting a near-future value of an operation coil current and performing control such that the near-future value does not fall below a holding current threshold value by a control unit. An electromagnetic switch control deviceopens and closesby an electromagnetic force corresponding to energization of operation coilsand, and includes PWM control unitstothat perform PWM pulse width modulation control of a current value A flowing through the operation coilsand. The PWM control unitstoestimate the near-future predicted current value flowing through the operation coilsandby using a terminal voltage V of the operation coilsand, and perform PWM control based on the estimated current value. The predicted current value Y is estimated by using an impedance Z of the operation coilsand. The impedance is a variable obtained by current values Aand Aand terminal voltages Vand Vof the operation coilsand, and a constant approximated over a predetermined period from a latest past to a present time is used. The impedance is updated for each predetermined period.

Electromagnetic switch control device

Even when a service disconnect switch is opened, an integrated circuit connected to single battery cells are operated. The cell controller is provided with: the integrated circuits; a signal transmission path through which a signal is transmitted between the integrated circuits via the capacitors; and the connection circuit. The first integrated circuit is provided corresponding to the first cell group electrically connected to one side of the SD-SW, and the second integrated circuit is provided corresponding to the second cell group electrically connected to one side of the SD-SW. The connection circuit AC-couples the ground terminal GND of the first integrated circuit to the ground terminal GND of the second integrated circuit through the capacitor.

Battery management device

Provided are a battery monitoring device capable of suppressing a current flowing to individual battery cells and enhancing the safety thereof, even when there is a short circuit, for example, in a connection line connecting substrates having integrated circuits mounted thereon and a substrate having a microcomputer mounted thereon or a connection line connecting the substrates having the integrated circuits mounted thereon, and a battery system using the same. Resistors are provided in a positive electrode input lineconnecting a positive electrode side of a battery pack groupand a total voltage detecting unitand/or a negative electrode input lineconnecting a negative electrode side of the battery pack groupand the total voltage detecting unitand the resistors of the positive electrode input lineand/or negative electrode input lineare arranged on individual cell monitoring circuit boardsand

Battery monitoring device and battery system using same

The present invention enables correct detection of the state of a relay provided on each of the positive and negative terminal sides of a secondary battery. A positive-side main relay makes or breaks continuity between first and second positive contact points, and a negative-side main relay makes or breaks continuity between first and second negative contact points. A microcomputer can measure a first voltage between the first positive and first negative contact points, a second voltage between the second positive and first negative contact points, and a third voltage between the first positive and second negative contact points. The microcomputer detects the state of the positive-side main relay based on a voltage measurement result obtained when the first and second voltages are measured synchronously, and detects the state of the negative-side main relay based on a voltage measurement result obtained when the first and third voltages are measured synchronously.

Battery monitor

A battery system includes a battery module having a plurality of assembled batteries. Battery monitoring circuits are provided to correspond to each of the assembled batteries of the battery module. A control circuit controls operation of the battery monitoring circuits. A first signal transmission path transmits signals that are input and output between the battery monitoring circuits and the control circuit. A first isolation element is connected to the control circuit, and a second isolation element is connected to the battery monitoring circuit. The first signal transmission path is isolated from the control circuit by the second isolation element. The electrical potential of the first signal transmission path is a floating potential in relation to the electrical potentials of the control circuit and battery monitoring circuits.

Battery system

Cell voltage measurement is executed immediately after termination of diagnosis on a cell voltage detection function. In a battery managing device, a voltage detecting unitdetects a terminal voltage of each of battery cellsand. An RC filteris electrically connected to voltage detecting lines L, L, and L, and a status variation causing unitcauses an electrical status variation with respect to the voltage detecting lines L, L, and L. A voltage fluctuating unitfluctuates the terminal voltage of the battery cellsandin response to the electrical status variation that is caused by the status variation causing unit. A microcomputerdiagnoses the voltage detecting uniton the basis of a detection result of the terminal voltage of the battery cellsandby the voltage detecting unitwhen the terminal voltage of the battery cellsandis fluctuated by the voltage fluctuating unit

Battery managing device, battery monitoring circuit, and control system

An object is to achieve management control of an assembled battery using an accurate measured value of a cell voltage. A battery system monitoring apparatusthat monitors and controls a battery system includes battery monitoring circuitsprovided for respective cell groups. Each of the battery monitoring circuitsincludes a cell voltage measurement modulethat is connected with two electrodes of respective single battery cellsof a corresponding cell groupvia voltage detection linesand that measures a cell voltage of each of the single battery cellsat each of predetermined timings. An RC filteris connected with the voltage detection lines. The RC filterincludes resistors and capacitors. The cell voltage measurement moduleextends intervals at which the cell voltage is to be measured when a stored charge amount in the capacitor in the RC filterchanges.

Battery system monitoring apparatus

Measurement of a cell voltage is executed immediately after diagnosis of a battery management device is ended. In a battery management device, current sources repeatedly perform an energization operation to cause a current to flow to voltage detection lines with a magnitude of the current that enables each amount of charge stored in capacitors changed by one energization operation to fall within a range corresponding to a fluctuation width of terminal voltages of battery cells during the energization operation when resistors are in a normal state. When the difference between the current terminal voltage of the battery cell and the past terminal voltage of the battery cell is larger than the predetermined threshold value, the microcomputer diagnoses that the resistor is in the open state.

Battery management device, battery monitoring circuit, and control system

Even with a large ripple voltage superposed on a voltage of a battery cell, the voltage of the battery cell can be measured accurately. In a battery monitoring device, a supply circuit, based on a reference voltage inputted from an assembled battery, generates a driving voltage for driving each of switching elements, of a selection circuit and supplies the driving voltage to the selection circuit. The reference voltage is inputted from the assembled battery to the supply circuit via a detecting filter circuit. As a result, a time constant of a route through which the reference voltage is inputted from the assembled battery to the supply circuit is approximately equal to time constants of detecting filter circuits.

Battery monitoring device

A battery system includes a battery module having a plurality of assembled batteries. Battery monitoring circuits are provided to correspond to each of the assembled batteries of the battery module. A control circuit controls operation of the battery monitoring circuits. A first signal transmission path transmits signals that are input and output between the battery monitoring circuits and the control circuit. A first isolation element is connected to the control circuit, and a second isolation element is connected to the battery monitoring circuit. The first signal transmission path is isolated from the control circuit by the first isolation element and is isolated from the battery monitoring circuit by the second isolation element. The electrical potential of the first signal transmission path is a floating potential in relation to the electrical potentials of the control circuit and battery monitoring circuits.

A battery system monitoring device includes a plurality of battery monitoring circuits, which is respectively provided in cell groups, and a balancing resistor. Each of the battery monitoring circuits includes a cell voltage measurement unit to measure a cell voltage of each single battery cell at predetermined timing, a discharge switch to switch a state of a discharge current which flows from each single battery cell through the balancing resistor, and a balancing control unit configured to control the discharge switch. A filter circuit is connected between the cell voltage measurement unit and each single battery cell. The cell voltage measurement unit determines whether a cell voltage is measured within a transient response period corresponding to a time constant of the filter circuit and corrects a measurement value of a cell voltage by using a correction value correcting a result of the determination.

Battery system monitoring device

A cell controller in a battery-monitoring device that monitors an assembled battery having a single cell group or a plurality of cell groups, each made up with a plurality of battery cells connected in series, includes: a startup terminal to which a first discharge resistor is connected and a startup voltage is applied; and a cell-balancing unit that executes cell balancing operation in order to adjust charge levels of the plurality of battery cells during a time period through which the startup voltage remains equal to or greater than a predetermined voltage, wherein: the startup voltage is applied for a predetermined length of time by a first timer unit that includes a passive element capable of accumulating electric energy and capable of discharging electric energy to the startup terminal.

Growing community of inventors

Hitachinaka, Japan

Tomonori Kanai