Abstract: A battery pack includes a plurality of battery cells and holder that has battery cells arranged in a parallel posture. Holder has partition wall between adjacent battery cells for arranging battery cells at fixed positions. Partition wall has a surface facing battery cells as resin molded layer shaped to arrange battery cells at the fixed positions. Partition wall has a three-layer structure where thermally insulating plate is disposed inside and resin molded layer is laminated on both surfaces of thermally insulating plate. Holder is formed in a single-piece structure by molding resin molded layer from a synthetic resin.

Abstract: A cell module includes a plurality of cylindrical batteries and a holder composed by arranging each of cylindrical batteries in a parallel posture. The holder includes: a holder body having holding spaces for arranging cylindrical batteries at fixed positions; and a sub holder stacked on the holder body. The holder body has stopper portions deformed toward surfaces of cylindrical batteries arranged in holding spaces. The sub holder has push rods that push out stopper portions to cylindrical batteries in a state of being coupled to the holder body. In a state in which the sub holder is coupled to the holder body, in the cell module, the push rods thrust stopper portions against cylindrical batteries, and press the surfaces of cylindrical batteries arranged in holding spaces.

Abstract: A battery pack includes a plurality of batteries that are chargeable and dischargeable, a battery holder that arranges the batteries at predetermined positions, and a bus bar that is a metal sheet fixed to electrode terminals of the batteries. The bus bar includes: a plurality of fixed terminals connected with the electrode terminals of the batteries; a base that connects the plurality of batteries with each other through the plurality of fixed terminals in series and/or in parallel; and fuse links that include ends connected with the fixed terminals, respectively, and roots that are connected with the base. The battery pack further includes a heat insulating member that tightly covers surfaces of the fuse links, and surfaces of the fixed terminals connected with the fuse links, respectively.

Abstract: A cell module includes a plurality of cylindrical batteries and a holder composed by arranging each of cylindrical batteries in a parallel posture. The holder includes: a holder body having holding spaces for arranging cylindrical batteries at fixed positions; and a sub holder stacked on the holder body. The holder body has stopper portions deformed toward surfaces of cylindrical batteries arranged in holding spaces. The sub holder has push rods that push out stopper portions to cylindrical batteries in a state of being coupled to the holder body. In a state in which the sub holder is coupled to the holder body, in the cell module, the push rods thrust stopper portions against cylindrical batteries, and press the surfaces of cylindrical batteries arranged in holding spaces.

Abstract: A battery pack includes a plurality of battery cells and holder that has battery cells arranged in a parallel posture. Holder has partition wall between adjacent battery cells for arranging battery cells at fixed positions. Partition wall has a surface facing battery cells as resin molded layer shaped to arrange battery cells at the fixed positions. Partition wall has a three-layer structure that non-melting plate is disposed inside and resin molded layer is laminated on both surfaces of non-melting plate. Holder is formed in a single-piece structure by molding resin molded layer from a synthetic resin.

Abstract: A battery pack includes a plurality of batteries that are chargeable and dischargeable, a battery holder that arranges the batteries at predetermined positions, and a bus bar that is a metal sheet fixed to electrode terminals of the batteries. The bus bar includes: a plurality of fixed terminals connected with the electrode terminals of the batteries; a base that connects the plurality of batteries with each other through the plurality of fixed terminals in series and/or in parallel; and fuse links that include ends connected with the fixed terminals, respectively, and roots that are connected with the base. The battery pack further includes a heat insulating member that tightly covers surfaces of the fuse links, and surfaces of the fixed terminals connected with the fuse links, respectively.

Abstract: A battery pack detachably mounted in a device for supplying power to the device to operate the device includes at least one rechargeable secondary battery (1), a battery case (31) housing the rechargeable secondary battery (1), a mounting mechanism for mechanically mounting the battery case (31) in the device, an electrical connection connected electrically to the device for supplying power to the device, and a pack circuit board (74) securing the electrical connection. The battery case (31) is divided into a first casing and a second casing, the pack circuit board (74) is secured to the inside surface of the first casing, and the mounting mechanism is installed so the mounting mechanism is at least partially exposed on the surface of the first casing.

Abstract: The purpose of the present invention is to provide simpler and more reliable electrical wiring than a lead wire. A battery pack includes at least one rechargeable secondary battery (1), a battery holder (70) for housing the secondary battery (1) in a predetermined position, a pack circuit board (74) having a mounted electronic circuit for monitoring the secondary battery (1), and an electrical connection wire (85) for electrically wiring the pack circuit board (74). Here, the electrical connection wire (85) is a bent metal wire. Because wiring is realized using metal wire, and the metal connection is secured after the wiring has been completed, movement and deformation due to vibrations and other factors, such as that which occurs in the case of conventional lead wires, are avoided, and reliability can be improved.

Abstract: A thermostat comprises a first laminated metal plate and a second laminated metal plate in which a plurality of metal layers having different rates of expansion are laminated. The first laminated metal plate has a movable contact. The second laminated metal plate is disposed in such a position as to put the first laminated metal plate to the off and on positions. The first and second off temperatures, which put the movable contact in the off position by causing the first and second laminated metal plates to deform, and the first and second return temperatures, which return the movable contact from the off position to the on position, are set respectively at different temperatures.

Abstract: The battery pack for electric power tools of this invention has a circuit breaker connected in series with the batteries to protect those batteries from abnormal temperature or abnormal current by cutting-off the current. The circuit breaker is provided with a manual reset mechanism wherein even if the temperature sensing element is cooled, automatic reset will not occur. The circuit breaker must be manually reset. After the circuit breaker detects battery abnormality and cuts-off current, the current cut-off state is maintained until the manual reset mechanism is operated.