Nissan Motor Company Limited

Tsuyoshi Morita

Atsushi Kawase

Noriko Hoshino

Hayato Nagakura

Shinsuke Yoshida

Utaka Kamishima

Takuya Kinoshita

Shinsuke Nakazawa

Takeshi Miyamoto

Tomonaga Sugimoto

Yuji Nakada

Yukari Tsukamoto

Yuuichi Hara

Kouhei Kasedou

Ayuka Kawata

A battery power supply device includes an alternating-current power source, a secondary cell connected to the alternating-current power source, a first switch for selectively connecting or cutting off a cell and the alternating-current power source, the first switch being disposed between the battery and the alternating-current power source, and a ground fault sensing device for sensing a ground fault in the battery, the ground fault sensing device being connected closer to the battery than the first switch; the ground fault sensing device sensing a ground fault in the battery when the first switch is off.

Power supply apparatus

A battery chargerequipped with an AC/DC converter charges a secondary battery moduleconstituted with a plurality of unit cells. The unit cellsare each connected in parallel with a constant voltage circuitconstituted with a Zener diodeand a resistorconnected in series, and the unit cellachieving a state of full charge is detected based upon the difference between the potentials at the two sides of the resistor. As a battery controllerlowers the charging power used by the battery chargerin response to the full charge state being achieved, it is ensured that the secondary battery moduleis charged thoroughly while preventing individual unit cellsfrom becoming overcharged.

Charge control device and method for secondary battery module

A connection diagnostic apparatus for a ground fault detector including an oscillator connected via a coupling capacitor to an electric circuit with a first connection line and a second connection line, and a voltage detector for detecting a voltage value between the oscillator and the coupling capacitor is provided with a first relay and a second relay provided in the first connection line and the second connection line, and a programmable controller. The programmable controller determines a connected state of the ground fault detector based on a change amount of a voltage value detected by the voltage detector when the first relay is turned on or off and determines the connected state of the ground fault detector based on a change amount of a voltage value detected by the voltage detector when the second relay is turned on or off.

Connection diagnostic apparatus for ground fault detector

Disclosed are abnormality detecting apparatus and method for a high-voltage circuit (A), in which: a square wave pulse is outputted to a measuring point (p) with a switch (SW) set off, the switch (SW) provided between an inverter circuit () and the ground, a difference voltage (Vp-p) between a voltage (Vh) detected at a phase of T/2 and a voltage (V) detected at a phase of T is obtained, the occurrence of a ground fault is detected based on the size of the difference voltage (Vp-p); and the square wave pulse is outputted to the measuring point (p) with the switch (SW) set on, and it is judged that a loosening of a fastening section (p) occurs when the difference voltage (Vp-p) exceeds a reference voltage (Vref).

Apparatus and method for detecting abnormality of high voltage circuit

A battery cell includes a power generating element, an electrode connected to the power generating element and configured to electrically connect the power generating element to outside, and an exterior member configured to cover the power generating element. The exterior member includes an insulating layer and a conductive layer, and the conductive layer includes a connection section electrically connected to the outs.

Battery cell and monitoring device for assembled battery

A monitor () monitors an assembled battery () having a plurality of cells () and a power supply line () for connecting the plurality of the cells (). The monitor () includes: a detecting portion () for detecting a voltage of each of the cells () of the plurality of the cells (); and a controlling portion () for receiving a voltage detection result detected by the detecting portion (). The detecting portion () converts the voltage detection result into an alternating current communication signal and transmits the alternating current communication signal via the power supply line () to the controlling portion ().

Monitor of assembled battery

A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit includes a voltage conversion unit for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, an error detection unit for detecting an error for the first voltage and the second voltage based upon the first voltage and the second voltage when the DC voltage is, and a voltage calculation unit for correcting a difference between the first voltage and the second voltage based upon the error detected by the error detection unit and calculating the DC voltage based upon the corrected difference between the first voltage and the second voltage.

Voltage detection device and voltage detection method

A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, a voltage calculation means for inputting the first voltage and the second voltage outputted from the voltage conversion means and calculating the DC voltage based upon a difference between the inputted first voltage and the inputted second voltage, and a first failure judgment means for judging that failure has occurred if at least one of the first voltage and the second voltage is not inputted to the voltage calculation means.

In secondary battery capacity adjustment apparatus and method for an assembled cell unit, the assembled cell unit includes: a plurality of secondary batteries; and a control board on which a capacity adjusting section is mounted, the capacity adjusting section being installed to correspond to each of the secondary batteries and configured to consume an electric power of a corresponding one of the secondary batteries to adjust a residual capacity of the corresponding one of the secondary batteries, the number of the secondary batteries to be capacity adjusted is determined in accordance with a heat radiation quantity of the control board, and the electric power of each of the secondary batteries to be capacity adjusted is caused to have consumed by the corresponding capacity adjusting section, for the determined number of secondary batteries to be capacity adjusted, to adjust a capacity of each of the secondary batteries.

Capacity adjustment apparatus and method of secondary battery

In secondary battery capacity adjustment apparatus and method for an assembled cell unit, the assembled cell unit includes: a plurality of secondary batteries; and a control board on which a capacity adjusting section is mounted, the capacity adjusting section being installed to correspond to each of the secondary batteries and configured to consume an electric power of a corresponding one of the secondary batteries to adjust a residual capacity of the corresponding one of the secondary batteries, a priority order of the secondary batteries to be capacity adjusted is determined in accordance with a mounted position of the capacity adjusting section corresponding to one of the secondary batteries on the control board and an electric power of each of the secondary batteries is caused to have consumed by the corresponding capacity adjusting section in accordance with the determined priority order to adjust a capacity of each of the secondary batteries.

A grounding detector includes a coupling capacitor connected at one end to an output terminal of a power supply and at another end to a measuring point, a voltage detector to detect a voltage amplitude generated at the measuring point, a pulse generator to generate a pulse signal at a prescribed frequency, to apply the pulse signal to the measuring point, and to generate a modified pulse signal having a modified frequency when the detected voltage amplitude is outside of a prescribed voltage range, the modified frequency being set below the prescribed frequency that existed when the voltage amplitude detected by the voltage detector is within the prescribed voltage range, and a grounding occurrence detection unit that detects the occurrence of grounding of the circuit based on the voltage amplitude detected at the measuring point during the application of the pulse signal to the measuring point.

Grounding detector

An apparatus and method for detecting total voltage of an assembled battery including a number of serially-connected electric cells. Voltages of the respective cells are detected and added up, correlation between the resulting total voltage and a total voltage obtained by detecting the voltage of the assembled battery directly from its terminals is obtained, and a corrective arithmetic operation is carried out inside the device to correct the total voltage obtained through direct detection. The total voltage is detected with a high degree of accuracy without the need for individual adjustment operations using a variable resistance, high-accuracy external tester.

Voltage detector for an assembled battery

A ground fault detector and detection method for a vehicle that can determine the cause of the occurrence of a ground fault after detecting the presence of the ground fault. The output terminal of a high-voltage battery is connected to one side of a coupling capacitor. In operation, a pulse signal is applied to a measurement point on the other side of the coupling capacitor, and the voltage generated at that point is detected. Whether the high-voltage battery or the electrical equipment units are grounded is determined. To determine the cause of the ground fault, the oscillation frequency of the square-wave pulse signal is changed and applied to the measurement point. From the change in voltage amplitude detected, it is determined whether the cause of the ground fault is a resistive or a capacitive ground fault, according to the change in the impedance of the battery or the units.

Ground fault detector for vehicle

A battery pack of a series combination of cell units is connected with a motor drive control circuit to drive a traction motor for a vehicle. A current sensor senses a discharge/charge current of the battery pack, and a voltage detecting circuit senses a voltage between two separate points in the series combination of the battery pack. A memory section stores a reference voltage drop quantity representing a decrease in voltage during a predetermined time interval between the two separate points. An offset detecting section compares an actual voltage drop quantity sensed by the voltage detecting circuit, with the reference voltage drop quantity, thereby detects a non-discharge/charge-current state of the current sensor, and reserves an output of the current sensor, as an offset quantity upon the detection. A correcting section corrects a sensed value of the discharge/charge current with the reserved offset quantity.

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Zama, Japan

Tsuyoshi Morita