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公开(公告)号：US20230020978A1
公开(公告)日：2023-01-19
申请号：US17951904
申请日：2022-09-23
发明人： Long Li , Li Li , Chenzhong Zhang , Chao Xian , Jingru Zhang
摘要： A power unit is configured to be connected to a garden or outdoor power execution device and includes a housing, a motor, and a control assembly. The housing is formed with an accommodation space. The motor is at least partially disposed in the accommodation space. The control assembly is used for controlling the motor. Maximum output power P of the motor is greater than or equal to 1500 W and less than or equal to 5500 W, a mass M1 of the power unit is greater than or equal to 8 kg and less than or equal to 14.5 kg, and a ratio of the maximum output power P to the mass M1 is higher than or equal to 103.5 W/kg and lower than or equal to 687.5 W/kg.
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公开(公告)号：US11374419B2
公开(公告)日：2022-06-28
申请号：US16896781
申请日：2020-06-09
发明人： Dezhong Yang , Jingru Zhang , Hong Zhu , Qing Gao
IPC分类号： H02J7/00 , G01R31/389 , G01R31/396 , G01R31/3842 , G01R31/367
摘要： A measuring method for a portable electrical energy system includes acquiring a total capacity and an initial electric quantity percentage of each battery pack, detecting a discharging current and a discharging time of each battery pack, calculating a discharging capacity of each battery pack, calculating a remaining electric quantity of each battery pack; calculating a real-time electric quantity percentage of each battery pack; acquiring an open circuit voltage of each battery pack and a real-time internal resistance of a cell unit of each battery pack; calculating a remaining electric quantity of each battery pack; and calculating a remaining electric quantity of the portable electrical energy system. This method can reduce the calculation error of the remaining electric quantity and improve the battery utilization.
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