Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hitachi Koko Co., Ltd.

Kazuhiko Funabashi

Nobuhiro Takano

Takao Aradachi

Hiroyuki Hanawa

Yasushi Nakano

Eiji Nakayama

Shinji Watanabe

Tomomasa Nishikawa

Toshio Mizoguchi

Chikai Yoshimizu

Shota Kanno

Satoshi Yamaguchi

Yoshikazu Kawano

Takuya Teranishi

Masayuki Ogura

Katsuhiro Oomori

Toshiaki Koizumi

Takuhiro Murakami

Takuya Yoshinari

Hiromi Ozawa

Hideyuki Tanimoto

Haruhisa Fujisawa

Junichi Toukairin

Takeshi Takeda

Shota Takeuchi

Akira Matsushita

Atsushi Nakagawa

Shigeru Shinohara

Hiroaki Orikasa

Kazutaka Iwata

Kenichirou Yoshida

Yoshihiro Komuro

Yukihiro Shima

Hayato Yamaguchi

Takafumi Itoh

Toshinori Yasutomi

Naoki Tadokoro

Hironori Mashiko

Hideki Watanabe

Yuji Kishima

Takuma Saito

Kenrou Ishimaru

Shinichirou Satou

Kenji Kobori

Yuki Horie

Kenro Ishimaru

Yusuke Funabiki

Junpei Sato

Hikaru Tamura

Masateru Niyada

Takahiko Shimada

Hirohisa Tomita

Osamu Kawanobe

Masaru Hirano

Yuuichi Konuma

Naoto Wakatabe

Kiyoshi Kato

Toshiaki Uchida

Keita Saitou

Yuta Noguchi

Miyoji Onose

Hidekazu Harada

Shigeru Takahashi

Ken Inui

Kousei Yokoyama

Tomoaki Sudo

Yuuichi Toyoshima

Atsushi Sumi

Yuki Mitoma

Norihide Tao

Noriyuki Horie

Toshihide Sasaki

Yoshihiro Hoshi

An electrical apparatus includes a battery pack, an electrical apparatus main body and a control unit. The battery pack has a plurality of cell units of which connection states are able to be switched and a plurality of battery side connection terminals. The electrical apparatus main body has a battery pack mounting portion to which the battery pack is mounted, a plurality of device side connection terminals to which the plurality of battery side connection terminals are connectable, and a load device to which power is supplied from the battery pack. The control unit is configured to stop or limit power supply from the battery pack to the load device when a voltage imbalance is generated between the plurality of cell units or a contact failure is generated between the plurality of battery side connection terminals and the plurality of device side terminals.

Electrical apparatus using battery pack

A battery pack having a first cell unit and a second cell unit in which multiple battery cells are connected in series is provided. When the battery pack is not connected to an electric apparatus main body, the first cell unit and the second cell unit are in a non-connection state in which the first cell unit and the second cell unit are not electrically connected to each other. The battery pack includes: a microcomputer, connected to one of the first cell unit and the second cell unit; a residual quantity display portion, connected to the microcomputer and displaying a battery residual quantity of the battery pack; and a switch, being operated by a worker. When the switch is operated while in the non-connection state, the microcomputer is configured to perform a light-on control to display the battery residual quantity by the residual quantity display portion.

Battery pack, electric apparatus using battery pack, and electric apparatus main body

A battery pack and an electric apparatus are provided. The battery pack is configured to be connectable to an electric apparatus main body of the electric apparatus. The battery pack includes: a first cell unit, including a first plurality of battery cells connected to each other, a first positive terminal, and a first negative terminal; a second cell unit, including a second plurality of battery cells connected to each other, a second positive terminal, and a second negative terminal; a microcomputer; and a casing, accommodating the first cell unit, the second cell unit, and the microcomputer. The first cell unit and the second cell unit are configured to be switched a connection state each other. The microcomputer is configured to be electrically connected to a positive terminal and a negative terminal of one of the first cell unit and the second cell unit and to be provided a power from the one of the first cell unit and the second cell unit.

Battery pack and electric apparatus using battery pack

The electrical apparatus, in which a series connection state and a parallel connection state of an upper cell unit including five battery cells and a lower cell unit can be automatically switched by means of a difference in a terminal shape on the electrical apparatus body side, has a terminal holder and holds apparatus side terminals. The terminal holder, which establishes an electrically connected state with the connection terminals of the battery pack, is provided with two parallel protruding parts that extend in the forward-backward direction, and second rail grooves fitted to the protruding parts on the electrical apparatus side. Due to the fitting, relative movement of the terminal holder and the battery pack in the vertical direction can be suppressed, and wear on the apparatus side terminals can be greatly suppressed.

A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.

Battery pack, electrical device using battery pack, and electrical device system

A battery pack which has cell units in which top-side and bottom-side battery cells are connected in series, and is capable of switching the connection state of the cell units, wherein a control unit monitors voltage imbalances between the plurality of cell units, and also monitors whether or not a cell unit contact failure has occurred. In order to stop a charging/discharging when a contact failure occurs, a signal (abnormality stoppage signal or charging stoppage signal) for stopping discharge is produced and outputted to the electrical device body-side.

Battery pack and electrical apparatus using battery pack

Provided are a battery pack and an electrical apparatus by which information can be transmitted at an appropriate timing from the battery pack to a device body. A battery pack () includes: a serial communication reception circuit () and a temperature information transmission circuit (); an LS terminal that is selectively connected to the serial communication reception circuit () or the temperature information transmission circuit (); a first switching circuit () that is provided between the LS terminal and the serial communication reception circuit () and the temperature information transmission circuit (); and a V terminal that is connected to the first switching circuit (). The first switching circuit () switches between connecting the serial communication reception circuit () or the temperature information transmission circuit () to the LS terminal according to a signal inputted from the V terminal.

Battery pack and electrical apparatus

A DC power supply device includes a first conversion unit connected to an AC power supply, a second conversion unit connected to an electric tool, and a cable connecting the first conversion unit and the second conversion unit to each other. The first conversion unit includes a power factor correction circuit, converts an AC voltage having a first voltage value, input from the AC power supply, into a DC voltage having a second voltage value higher than the first voltage value, and outputs the DC voltage having the second voltage value to the cable. The second conversion unit converts the output voltage of the first conversion unit, input via the cable, into a DC voltage having a third voltage value lower than the second voltage value, and outputs the DC voltage having the third voltage value to the electric tool.

DC power supply device

A battery pack includes cell units in which upper and lower battery cells are connected in series, wherein an output of series-connection and an output of parallel-connection can be switched. The cell units are respectively provided with protection circuit ICs for monitoring the state of the battery cells, and only the protection circuit on the lower cell unit side is provided with a controllerincluding a microcomputer. To adjust the power consumption for the microcomputer only provided in the lower cell unit, the circuit on the upper cell unit side is provided with a current consumption control means including dummy loads. The current consumption control means is operated in conjunction with the start-up of the microcomputer in the controller so as to equalize power consumption on the upper cell unit side and the lower cell unit side.

In an upper cell unit () and a lower cell unit () comprising five battery cells, positive electrode terminals () are set apart and aligned vertically, and negative electrode terminals () are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (), and short circuiting of the lower terminals () is effected using a short bar. When the electrical device body is rated at 18V, the upper and lower terminals (andand) are simultaneously made to contact the device-side terminals, and the upper cell unit () and the lower cell unit () assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.

Provided is an electric device, power device, electric device system, and management device capable of providing a theft prevention function that requires less effort as compared to the prior art. A power tool comprises a main power tool unit, and a battery packwhich can be attached to and removed from the main power tool unit. The main power tool unit and the battery pack each have a storage means for storing at least one authentication code and a communication means for transmitting and receiving the authentication code, and permit use when an authentication code received via the communication means matches at least one of the authentication codes stored in the storage means, and do not permit use when said authentication code does not match any of the authentication codes. The authentication code is set by a management device which is an external device.

Electric device, power device, electric device system, and management device

To provide a driver that can be reduced in the amount of gas to be injected into a pressure chamber. The driver has: an impactor configured to hit a stopper by moving from a first position toward a second position; a pressure chamber to be filled with gas for moving the impactor from the first position toward the second position; a control mechanism configured to move the impactor from the second position toward the first position; and a gas injection portion configured to inject gas into the pressure chamber, wherein the impactor is capable of taking a standby position between the second position and the first position, and the control mechanism is configured to stop the impactor at an adjustment position closer to the second position than the standby position before gas is injected into the pressure chamber.

Driver

A power tool includes: a battery connecting part to which one of a first battery pack and a second battery pack having capacity smaller than that of the first battery pack is detachably attachable; a motor driven by electric power supplied from the battery pack; current detection means configured to detect a discharge current flowing from the battery pack to the motor; cut-off controlling means configured to cut off the discharge current when the discharge current becomes equal to or larger than a current threshold; and battery type discrimination means configured to discriminate the battery pack connected to the battery connecting part. The current threshold when the second battery pack is connected to the battery connecting part is lower than that when the first battery pack is connected to the battery connecting part.

Power tool

In order to provide a tool in which a motor is assuredly prevented from being restarted when power is turned on again after a power supply interruption due to a contingency, a disk grinderincludes a motorand a switchswitchable between an ON position at which the motor is driven by an operator and an OFF position at which the motor is stopped. Furthermore, first and second restart prevention meansare provided to disable driving of the motor until the switch is turned again to the ON position when power supplied to the motorfalls below or under a predetermined value.

Power Tool

A power tool includes a brushless motor, a rectifier circuit configured to rectify an AC voltage supplied from an AC power supply and output a rectified voltage, an inverter circuit configured to perform switching actions with respect to the rectified voltage to be supplied to the brushless motor, a controller configured to control the switching actions of the inverter circuit, a trigger having an operating part being operable by a user, a switch rendered ON and OFF in accordance with an operation performed in the operating part, wherein when the switch is ON, the inverter circuit is electrically connected to the AC power supply whereas when the switch is OFF, and the inverter circuit is electrically disconnected from the AC power supply, and a power supply circuit connected between the switch and the AC power supply and configured to supply a voltage to the controller.

Growing community of inventors

Hitachinaka, Japan

Kazuhiko Funabashi