Assembled battery and battery system

Abstract

An assembled battery includes an aqueous secondary battery and a non-aqueous secondary battery whose individual battery capacitance is smaller than that of the aqueous secondary battery. The non-aqueous secondary battery and the aqueous secondary battery are connected in series in such a manner that the polarities are reversed. Charging and discharging are performed based on the polarity of the non-aqueous secondary battery.

Description

technical field [0001] The present invention relates to a battery pack including a plurality of secondary batteries and a battery system for charging and discharging the battery pack. Background technique [0002] Conventionally, two-wheeled vehicles, three-wheeled vehicles, and vehicles with four or more wheels have been equipped with lead-acid batteries for starting a power system or for driving electric circuits and electric equipment. Lead-acid batteries are cheap, but their energy density is low, so they are heavy and bulky. From the viewpoint of fuel consumption and power performance as a vehicle, light weight and downsizing of the weight and volume are required. As its improvement plan, there is a nickel-cadmium secondary battery (nickel-cadmium secondary battery), a nickel-hydrogen secondary battery (nickel-hydrogen secondary battery) or a lithium ion secondary battery (lithium ion secondary battery) with a large storage energy density. ), lithium-polymer secondary...

AI Technical Summary

Problems solved by technology

Therefore, when the assembled battery described in Patent Document 1 is charged by such a charging circuit for constant voltage charging, the charging cannot be completed, and overcharging may cause characteristic degradation, failure, or safety problems.

In addition, since the aqueous solution secondary battery generates heat near full charge, there is also a problem that the nonaqueous secondary battery combined with the aqueous solution secondary battery is deteriorated due to heating.

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