Power system and assembled battery controlling method

Abstract

A power supply system comprises: an assembled battery in which a plurality of cells are connected in series and which supplies power from a series circuit of the cells to a device; a power generator that parallely supplies generated power to the assembled battery and the device connected in parallel; a plurality of forced discharge units that cause the plurality of cells to forcibly discharge individually; a cell state detector that detects a state of each cell; and a controller which, when the cell state detector detects that at least one of the plurality of cells is in a first state showingthat the cell is not fully charged, causes the cell detected to be in the first state to discharge by means of the forced discharge units until the cell state detector detects that the cell enters a second state having a lower state of charge than the first state.

Description

technical field [0001] The present invention relates to a power supply system including a battery pack in which a plurality of batteries are combined, and a method for controlling the battery pack. Background technique [0002] Alkaline batteries such as nickel-hydrogen batteries or nickel-cadmium batteries, and non-conductive batteries such as lithium-ion secondary batteries or lithium-polymer secondary batteries Aqueous electrolyte secondary batteries (non-aqueous electrolyte secondary batteries) have higher energy density per unit weight than lead-acid batteries, so they are attracting attention as power sources installed in mobile bodies such as vehicles and portable devices. In particular, if a battery composed of a plurality of non-aqueous electrolyte secondary batteries is connected in series to form a battery pack having a higher energy density per unit weight instead of a lead storage battery as a battery starting (cell starter) power supply (that is, not a vehicle ...

AI Technical Summary

Problems solved by technology

[0011] Or, when the SOC reaches near 100%, the OCV of the assembled battery rises and becomes equal to the output voltage of the generator, or the charging and discharging path of the assembled battery is blocked to prevent overcharging of the assembled battery, because the assembled battery cannot absorb the output voltage of the generator. Therefore, the current from the generator will be excessively supplied to other electric equipment in the car (car lights, car stereo, car air conditioner, etc.), and there is a danger of causing these electric equipment to malfunction

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