Abstract: An electrical device body connectable to a battery pack, includes a drive part, and a terminal part. The terminal part having a positive input terminal electrically connected to the drive part, a negative input terminal electrically connected to the drive part, and a short circuit element having a first terminal part, a second terminal part, and a connection part connecting the first terminal part and the second terminal part, wherein the positive input terminal and the negative input terminal are disposed on an upper side of the terminal part and the short circuit element is disposed on a lower side of the terminal part in an upper-lower direction, the positive input terminal and the negative input terminal being apart from each other in a left-right direction crossing the upper-lower direction.

Abstract: A battery pack includes: a first case having a slot portion exposing a battery-side terminal portion and a guide portion guiding attachment to an electrical device main body; a second case defining a space accommodating a battery cell by being joined with the first case; a separator holding the battery cell; a circuit board fixed to a side of the separator facing the first case; and the battery-side terminal portion is fixed at a position corresponding to the slot portion of the circuit board and connectable to a main body side terminal of an electrical device main body. The separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, and the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 controller 350 including 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.

Abstract: In an upper cell unit (2146) and a lower cell unit (2147) comprising five battery cells, positive electrode terminals (2162, 2172) are set apart and aligned vertically, and negative electrode terminals (2167, 2177) 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 (2162, 2167), and short circuiting of the lower terminals (2172, 2177) is effected using a short bar 2059. When the electrical device body is rated at 18V, the upper and lower terminals (2162 and 2172, 2167 and 2177) are simultaneously made to contact the device-side terminals, and the upper cell unit (2146) and the lower cell unit (2147) 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.

Abstract: 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 controller 350 including 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.

Abstract: 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.

Abstract: 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 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.

Abstract: In an upper cell unit (2146) and a lower cell unit (2147) comprising five battery cells, positive electrode terminals (2162, 2172) are set apart and aligned vertically, and negative electrode terminals (2167, 2177) 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 (2162, 2167), and short circuiting of the lower terminals (2172, 2177) is effected using a short bar 2059. When the electrical device body is rated at 18V, the upper and lower terminals (2162 and 2172, 2167 and 2177) are simultaneously made to contact the device-side terminals, and the upper cell unit (2146) and the lower cell unit (2147) 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.

Abstract: 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.