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US 5,825,155 AGranted
Battery set structure and charge/ discharge control apparatus for lithium-ion battery
AssigneeKabushiki Kaisha Toshiba
InventorsHironori Ito, Yuichiro Hino, Naoki Tashiro, Masahiko Hagiwara, Keiichi Mitsui, Akihiko Uchida
Life of this patent
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Abstract
In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity.
Claims1
An electronic apparatus, comprising:
- a battery pack having:
- m (m is an integer of two or more) battery sets connected in series each having n (n is an integer of two or more) rechargeable battery cells connected in parallel and charge/discharge terminals connected to nodes of the m battery sets;
- charge/discharge current limiting resistors, each said charge/discharge current limiting resistor having at least a first and a second terminal, the first terminal connected to the nodes of the m battery sets and the second terminal connected to the charge/discharge terminals;
- and
- power supply terminals;
- voltage measuring circuits connected between the power-supply terminals and said charge/discharge terminals for measuring a voltage value of the m battery sets;
- a power-supply microprocessor for outputting a voltage check signal of said battery pack;
- amplifiers, connected to said charge/discharge terminals, for amplifying the voltage value of an integer multiple of 1/m of a total voltage value of the m battery sets;
- switches connected between said amplifiers and terminals;
- and
- a switch control circuit connected to said power-supply microprocessor and said switches and responding to the voltage check signal from said power-supply microprocessor, for turning off said switches when said voltage measuring circuits measure the voltage value of the m battery sets .
8 more elements
Dependencies are inferred from the claim text.