Yazaki Corporation

Yuki Chiyajo

Hidehiko Shimizu

Haruhiko Yoshida

Kimihiro Matsuura

Yasutaka Wakasugi

Keitaro Nozawa

Yoshiaki Nakayama

A pair of end plates is a pair of members provided at both ends of a battery cell assembly in an array direction to clamp the battery cell assembly from both sides in the array direction. The pair of end plates has a plate upper surface and a recess. The plate upper surface is positioned on the same side as that of an electrode mounting surface. The recess is recessed from the plate upper surface and accommodates at least part of a coupling connector. With this configuration, a battery module and a battery monitoring unit mounting structure can prevent the battery module from increasing in size.

Battery module and battery monitoring unit mounting structure

A fixation structure includes an electrical wire, a board, and a stapler. The electrical wire includes a core wire and a cover member. The electrical wire includes a core-wire covered part covered by the cover member, and a core-wire exposed part exposed from the core-wire covered part. The board includes a junction part electrically connected with the core-wire exposed part. The stapler includes a contact part and a fixation part. The contact part has a plate shape, and is positioned at a boundary between the core-wire exposed part and the core-wire covered part while contacting the core-wire exposed part and the core-wire covered part from a side opposite to the board when the core-wire exposed part is connected with the junction part. A pair of the fixation parts are provided on both sides of the contact part and fix the contact part and the board.

Fixation structure

A battery monitoring device includes a battery information input terminal, a battery state monitoring unit, an output terminal, a circuit board, and a housing member. The battery information input terminal is electrically connected to a battery state detecting member. The battery state monitoring unit receives a battery state detection signal via the battery information input terminal. The output terminal outputs monitoring information on the battery state corresponding to the battery state detection signal to an external arithmetic processor. The circuit board is provided with the battery information input terminal, the battery state monitoring unit, and the output terminal. The housing member is integrally formed with the battery information input terminal, the battery state monitoring unit, the output terminal, and the circuit board so as to accommodate at least the whole battery state monitoring unit and the whole circuit board and expose terminal connecting portions to the outside.

Battery monitoring device

By configuring low-pass filters each with a resistor and a capacitor, noise is removed. Based on a reference value of DC voltage that appears at output terminals of a battery pack circuit, a lowering portion of capacitance that arises in the respective capacitors is estimated in advance, and a compensation value is included in the resistance value of the respective resistors such that the cutoff frequencies of the low-pass filters are within an intended range. Even when a high voltage is handled, the variance in cutoff frequencies can be prevented from arising and the noise in an unnecessary frequency domain can be adequately reduced.

Filter circuit

A first pattern and a second pattern are stacked with each other. In a pattern of a first circuit for high voltage, a GND is formed as a solid pattern. In a pattern of a second circuit for low voltage, a GND is formed as a solid pattern. The solid pattern of the GND of the pattern of the first circuit for high voltage and the solid pattern of the GND of the pattern of the second circuit for low voltage partially face each other, thereby improving noise-resistant performance of the circuit for high voltage.

Growing community of inventors

Shizuoka, Japan

Yuki Chiyajo