Power supply apparatus and power supply switching method

Abstract

A power supply apparatus includes a plurality of power storage modules that are connected in parallel and a backup power storage module that is connected in parallel with the plurality of power storage modules. When charging or discharging of at least one of the power storage modules is disabled, charging of the other power storage modules is inhibited, discharging of the backup power storage module is permitted, states of charge of the backup power storage module and the other power storage modules are detected, and charging of the backup power storage module and the other power storage modules is permitted in accordance with the detected states of charge.

Description

technical field [0001] The invention relates to a battery-using power supply device and a power supply switching method. Background technique [0002] In recent years, secondary batteries such as lithium ion batteries have been rapidly and widely used in power storage devices for storing electric power, storage batteries for vehicles, etc. in combination with new energy systems such as solar cells and wind power generation systems waiting. In order to generate high output power, when multiple power storage elements, for example, multiple unit cells (also referred to as battery cells, electric cells, or cells) are used, a configuration in which multiple power storage modules are connected in series is employed. The battery block is configured such that a plurality of battery cells (for example, four battery cells) are connected in parallel and / or in series. A power storage module (also referred to as an assembled battery) is configured such that a plurality of battery block...

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Problems solved by technology

However, when batteries with different charge levels are connected to each other, a large current exceeding the rated value flows from t

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