Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Tomoyuki Arima

Akihiko Kudo

Tomonori Kanai

Akiko Tsukamoto

Hikaru Miura

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

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

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

An earth fault detection circuit for detecting an earth fault between a high-voltage battery and a motor includes: an A.C. signal generation portion generating an A.C. signal; a first capacitive element between the A.C. signal generation portion and one end side of the high-voltage battery; a voltage dividing circuit dividing a voltage on the one end side of the high-voltage battery; an earth fault detection portion detecting the earth fault between the high-voltage battery and the motor based on an earth fault detection signal inputted thereto; and a second capacitive element inputting an A.C. component of the voltage, on the one end side of the high-voltage battery, which is obtained by the voltage division in the voltage dividing circuit as the earth fault detection signal to the earth fault detection portion.

Growing community of inventors

Hitachinaka, Japan

Tomoyuki Arima