Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hitachi Koko Co., Ltd.

Koki Holdings Kabushiki Kaisha

Tomomasa Nishikawa

Haruhisa Fujisawa

Yoshitaka Akiba

Nobuhiro Takano

Shinki Ohtsu

Hiroyuki Hanawa

Kazuhiko Funabashi

Akira Matsushita

Toshio Mizoguchi

Takuya Teranishi

Yasushi Nakano

Mizuho Nakamura

Shota Kanno

Kazutaka Iwata

Masayuki Ogura

Hayato Yamaguchi

Satoshi Yamaguchi

Katsuhiro Oomori

Junichi Toukairin

Takuhiro Murakami

Hironori Mashiko

Yasuki Ohmori

Hiroki Uchida

Kunio Yamamoto

Hiroto Inagawa

Shoichi Hirai

Shota Takeuchi

Kenji Kobori

Hideyuki Tanimoto

Atsushi Nakagawa

Shinji Watanabe

Takuya Konnai

Chikai Yoshimizu

Yoshihiro Nakano

Kenichirou Yoshida

Masahiro Fujiwara

Tomoyoshi Yokota

Yoshio Iimura

Shinichi Sakamoto

Masanori Watanabe

Takao Aradachi

Akira Onose

Shinji Kuragano

Shinji Takano

Yoshiichi Komazaki

Takeshi Takeda

Tatsuya Ito

Tetsuhiro Harada

Yusuke Funabiki

Yutaka Ito

Shingo Yamazaki

Osamu Kawanobe

Masaru Hirano

Junpei Sato

Hikaru Tamura

Seiichi Kodato

Kouji Sagawa

Yuta Noguchi

Takahiro Hirai

Noriyuki Horie

Masashi Takehisa

Naoto Wakatabe

Saroma Nakano

Teruo Imai

Kenji Niwa

Shinichirou Satou

Hideyuki Hashimoto

Tsukasa Suzuura

Keita Saitou

Kenro Ishimaru

Satoru Matsuno

Norikazu Baba

Takuma Nonaka

Shigeru Takahashi

Kuniaki Kanbe

Satoshi Abe

Atsushi Sumi

Tetsuo Ebata

Fumikazu Hirasawa

Shiniki Otsu

Shinki Otsu

Satoshi Shimada

Yuki Ishikawa

Hiroaki Yonekawa

Takashi Kawamata

Yang Li

Mitsutaka Sakamoto

Hiroki Tsunoda

Katsuaki Sukegawa

Kazuhiko Morita

Kenichi Katou

In a battery pack and an electrical device, one or more sensors are provided at a battery pack side, and sensor information acquired on a battery side is used to control an electrical device main body. Sensors that collect and output physical information arising due to external factors are provided at a battery pack, and a control part of the battery pack processes signals detected by the sensors and creates a control signal compatible with a mounted electrical device main body. The control part of the battery pack transmits, to the electrical device main body, a signal for controlling the electrical device main body via a communication terminal to enable a control part of the electrical device main body to perform optimal control using sensor information.

Battery pack and electrical device

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

In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.

Battery pack, and electric appliance using battery pack

The electrical device comprises a common device main body having selectively and detachably attached thereto either a variable-voltage power supply device or a high-voltage power supply device. The device main body has: a protruding section that abuts a power supply-side main erroneous attachment prevention section provided in the variable-voltage power supply device and the high-voltage power supply device; a device-side main erroneous attachment prevention section that abuts the power supply-side main erroneous attachment prevention section provided in a low-voltage power supply device and prevents the low-voltage power supply device from abutting an attachment positioning section; and a device-side attachment permitting section that can be combined in a power supply-side auxiliary erroneous attachment prevention section provided in the high-voltage power supply device.

Electrical device system, electrical device, and power supply device

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

A power tool has a fan guide for straightening the flow of cooling air generated by a fan, wherein the branching passages through are provided for causing a portion of the cooling air drawn into the fan from a ventilation hole to diverge from a flow toward an exhaust port formed on a bearing guide side, and the portion of the cooling air flows toward an inlet and thereby circulates inside a housing. The branching passages through provided to the fan guide are formed so as to be inclined in the same direction as a circumferential direction so that air path resistance during actual operation (in an intermediate-speed region) does not increase.

Power tool

In the work device that has a self-holding circuit () maintaining power supply from a power supply circuit () by output from a microcomputer () and has a structure in which stopping output to the self-holding circuit () causes interruption of power supply from the power supply circuit () to the microcomputer (), the firmware of the microcomputer () is made to be rewritable and a power holding unit (condenser C) for temporarily continuing power supply to the microcomputer () is provided, thereby realizing a so-called 'off-delay timer function' for restarting the microcomputer (). This configuration enables maintenance of power to the microcomputer () after update of the firmware even in a work device that cannot be restarted once power has been turned off unless trigger operation is performed, thereby enabling automatic restart of the microcomputerafter resetting is enabled.

Work device

Providing an electric tool with excellent cooling efficiency. An electric tool includes: a housing; a motor; a fan; a sensing portion; a switching portion; and a circuit board. The motoris accommodated in the housing. The motorincludes a stator, a rotor, and a rotating shaft. The rotoris rotatable relative to the stator. The rotating shaftis rotatable together with the rotor. The fanis configured to generate a cooling air flow inside the housing. The sensing portionis configured to detect a rotated position of the rotor. The switching portioncontrols a rotation of the rotor. The sensing portionand the switching portionare mounted on the circuit board. The stator, the fan, the sensing portion, the switching portion, and the circuit boardare arranged in the housingalong an axial direction of the rotorin the order of the fan, the sensing portion, the circuit board, the switching portion, and the stator

Electric tool

The purpose of the invention is to provide a battery pack and a power tool on which the same can be detachably mounted such that compatibility can be ensured even if the dimensions of the battery cells therefor are changed, as well as a battery pack and power tool set. A second battery pack is provided with second battery cells, a second case which houses the second battery cells, a second latch portion for mounting the second battery pack to the power tool, and a second latch operating portion. The second battery pack has a larger case width than that of a specified battery pack for housing battery cells shorter than the second battery cells. However, as the rail width is the same, the second battery pack can be detachably mounted to the power tool in place of the specified battery pack.

Battery pack, power tool, and battery pack and power tool set

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.

Growing community of inventors

Hitachinaka, Japan

Tomomasa Nishikawa