US 11,811,249 B2
Battery-powered system, battery pack, electric work machine, and charger
Minoru Gyoda, Anjo (JP); Hitoshi Suzuki, Anjo (JP); and Motohiro Omura, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Jun. 2, 2020, as Appl. No. 16/890,518.
Claims priority of application No. 2019-104453 (JP), filed on Jun. 4, 2019.
Prior Publication US 2020/0388817 A1, Dec. 10, 2020
Int. Cl. H02J 7/00 (2006.01); B25F 5/00 (2006.01); H01M 50/574 (2021.01)
CPC H02J 7/00306 (2020.01) [B25F 5/00 (2013.01); H01M 50/574 (2021.01); H02J 7/0063 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A battery-powered system comprising an electrical device and a battery pack, wherein:
the battery pack comprises:
a battery comprising a positive electrode and a negative electrode;
a first positive electrode terminal electrically connected to the positive electrode;
a first negative electrode terminal electrically connected to the negative electrode;
a first communication terminal;
a first data output circuit comprising a first output terminal electrically connected to the first communication terminal, the first data output circuit being configured to generate and output a first signal via the first output terminal;
a first data input circuit comprising a first input terminal electrically connected to the first communication terminal, and a first ground terminal electrically connected to the first negative electrode terminal, the first data input circuit being configured to receive a second signal output by the electrical device via the first communication terminal and the first input terminal; and
a first limiting circuit configured to limit a flow of electric current from the first negative electrode terminal to the first communication terminal via the first data input circuit to a greater degree than a flow of electric current from the first communication terminal to the first negative electrode terminal via the first data input circuit; and
the electrical device comprises:
a second positive electrode terminal configured to be electrically connected to the first positive electrode terminal of the battery pack;
a second negative electrode terminal configured to be electrically connected to the first negative electrode terminal of the battery pack;
a second communication terminal configured to be electrically connected to the first communication terminal of the battery pack;
a second data output circuit comprising a second output terminal electrically connected to the second communication terminal, the second data output circuit being configured to generate and output the second signal via the second output terminal;
a second data input circuit comprising a second input terminal electrically connected to the second communication terminal, and a second ground terminal electrically connected to the second negative electrode terminal, the second data input circuit being configured to receive the first signal output from the battery pack via the second communication terminal and the second input terminal; and
a second limiting circuit configured to limit a flow of electric current from the second negative electrode terminal to the second communication terminal via the second data input circuit.