US 12,074,296 B2
Battery pack, electric apparatus using battery pack, and electric apparatus main body
Yasushi Nakano, Ibaraki (JP); Satoshi Yamaguchi, Ibaraki (JP); Hiroyuki Hanawa, Ibaraki (JP); Kazuhiko Funabashi, Ibaraki (JP); Tomomasa Nishikawa, Ibaraki (JP); Shota Kanno, Ibaraki (JP); Toshio Mizoguchi, Ibaraki (JP); and Takuya Teranishi, Ibaraki (JP)
Assigned to Koki Holdings Co., Ltd., Tokyo (JP)
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
Filed on May 2, 2023, as Appl. No. 18/311,228.
Application 18/311,228 is a continuation of application No. 17/832,694, filed on Jun. 6, 2022.
Application 17/832,694 is a continuation of application No. 16/622,283, granted, now 11,367,907, issued on Jun. 21, 2022, previously published as PCT/JP2018/020633, filed on May 30, 2018.
Claims priority of application No. 2017-118574 (JP), filed on Jun. 16, 2017; and application No. 2017-118575 (JP), filed on Jun. 16, 2017.
Prior Publication US 2023/0275277 A1, Aug. 31, 2023
Int. Cl. H01M 10/42 (2006.01); B25F 5/02 (2006.01); H01M 10/0525 (2010.01); H01M 10/48 (2006.01); H01M 50/204 (2021.01); H02H 7/18 (2006.01); B25B 21/02 (2006.01); H01M 50/247 (2021.01); H01M 50/278 (2021.01)
CPC H01M 10/425 (2013.01) [B25F 5/02 (2013.01); H01M 10/0525 (2013.01); H01M 10/48 (2013.01); H01M 10/482 (2013.01); H01M 50/204 (2021.01); H02H 7/18 (2013.01); B25B 21/02 (2013.01); H01M 2010/4271 (2013.01); H01M 50/247 (2021.01); H01M 50/278 (2021.01); H01M 2220/30 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A battery pack comprising:
a first cell unit and a second cell unit in which a plurality of battery cells is connected in series;
a microcomputer, being connected to one cell unit of the first cell unit and the second cell unit;
a residual quantity display portion, being connected to the microcomputer and configured to display a battery residual quantity of the battery pack; and
a switch, being configured to be operated by a worker,
wherein
the first cell unit and the second cell unit are configured to be switchable between a non-connection state and a series-connection state,
in non-connection state, the first cell unit and the second cell unit are not electrically connected to each other,
in the series-connection state, the first cell unit and the second cell unit are connected in series while the first cell unit is connected to a higher voltage side than the second cell unit, and
when the switch is operated while the first cell unit and the second cell unit are 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.