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857 results about "Rechargeable battery pack" patented technology

Rechargeable battery pack for a power tool

A battery pack for a power tool has a less-current consuming over-discharge protection. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a discharge detector configured to monitor a cell voltage across each of the secondary cells and to provide a discharge stop signal when any one of the cell voltages becomes lower than a predetermined threshold. The discharge stop signal is fed to deenergize the power tool. The discharge detector is composed of a voltage monitor and a power controller. The voltage monitor includes a plurality of comparators and a plurality of constant voltage elements each providing a constant voltage determining the threshold. Each comparator is configured to compare each cell voltage with the threshold to give a comparison result. The voltage monitor is energized by the battery stack to provide the discharge stop signal based upon the comparison results. The power controller is configured to energize the voltage monitor when the battery pack is connected to the power tool. Thus, the discharge detector is protected from consuming the energy of the battery pack while being disconnected from the power tool.
Owner:MATSUSHITA ELECTRIC WORKS LTD

Method for quickly supplementing electric energy of electric vehicle and power supply unit thereof

The invention relates to a method for quickly supplementing electric energy of an electric vehicle and a power supply unit thereof. The method is characterized in that a rechargeable battery pack is arranged on the electric vehicle, and a battery replacement unit, a charging library and a battery library are arranged in a power plant, wherein the rechargeable battery pack comprises a battery box and standardized standard battery units; a battery chamber is internally provided with a plurality of standard battery unit stations; guide rails are installed along with the load direction of the standard battery units; when the standard battery units operate, the standard battery units are arranged in the battery box and can smoothly load and unload in the battery box along the guide rails; after the standard battery units are in place, battery electrodes contact with electrode touching rails which are connected mutually by fixed series-parallel circuits; and the rechargeable battery pack is assembled on the electric vehicle. When it is required to supplement the electric energy, the electric vehicle enters the power plant, so that the standard battery units which are lack of electric energy are replaced by the standard battery units which are charged in the battery box. The power supply unit provided by the invention is convenient to use and reliable in performance, especially applied to quickly supplementing the electric energy for the electric vehicle, and having broad application prospects.
Owner:尹学军
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