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Document Type and Number:
Japanese Patent JP6642793
Kind Code:
PROBLEM TO BE SOLVED: To provide a battery pack for which a discharge cut-off voltage most suitable for the battery pack can be set and which therefore can optimize the balance between high capacity and high life.SOLUTION: A battery pack 10 is provided that can be used as a power source for a charging type tool 40. This battery pack includes discharge stop means. When reaching a predetermined condition, the discharge stop means executes stop of discharge or output of signals for stopping discharge. When ΔVP denotes an amount of change of an output voltage of the battery pack 10 in the unit time, and ΔTP denotes the amount of change of time in the unit time when a period of time until the battery pack 10 becomes in a completely discharged state from a fully charged state is 100, a value obtained by ΔVP/ΔTP is equal to or less than a predetermined value, which is used as the predetermined condition.SELECTED DRAWING: Figure 1

Junichi Tamura
Kenji Kobayashi
Yasunari Hashimoto
Application Number:
Publication Date:
February 12, 2020
Filing Date:
December 11, 2015
Export Citation:
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Max Co., Ltd.
International Classes:
H02J7/00; H01M10/44; H01M10/48
Domestic Patent References:
Attorney, Agent or Firm:
Ken Nakajima
Mikio Segawa