Energy storage apparatus and charge control method for the same

Abstract

The present invention provides a power storage apparatus and a charge control method for the same. Even if the charging is performed at a charging voltage higher than the assumed charging voltage, itis possible to continue charging without causing an inconvenience. The energy storage apparatus (10) includes an assembled battery (20) including a plurality of energy storage devices (21), a discharge shutoff device (43) incorporating a parasitic diode (43D), configured to switch a path of a charge to the assembled battery to a path through the parasitic diode, a voltage detection circuit (31) configured to detect a cell voltage of the energy storage device (21) and a battery voltage of the assembled battery (20), and a battery management unit (30). When the cell voltage in at least one energy storage device among the plurality of energy storage devices (21) is higher than a full charge voltage and equal to or more than an equalization start threshold value lower than an overcharge voltage, a CPU (33) of the battery management unit (30) switches a path of the charge to the assembled battery (20) to a path through the parasitic diode (43D) with the discharge shutoff device (43).

Description

technical field [0001] The technology disclosed in this specification relates to a power storage device and a charging control method for the power storage device. Background technique [0002] For example, Japanese Patent Application Laid-Open No. 2014-225942 is known as an electric storage system for engine starting of a vehicle. In this power storage system, secondary batteries that can be reduced in size and weight compared to lead batteries, such as lithium ion batteries, are used instead of lead batteries. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2014-225942 [0006] In addition, regarding this storage system, although the charging voltage of the lead storage battery is set at, for example, 14.8 [V] depending on the difference in battery characteristics, the charging voltage of the lithium ion battery is set at, for example, 14 [V]. The charging voltage is set lower than that of the lead stora...

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Problems solved by technology

[0006] In addition, regarding this storage system, although the charging voltage of the lead storage battery is set at, for example, 14.8 [V] depending on the difference in battery characteristics, the charging voltage of the lithium ion battery is set at, for example, 14 [V]. The charging voltage is set lower than that of lead-acid batteries

[0007] However, since the shape of the main body of the power storage system and the shape of the communication connector are the same as those of the lead-acid battery, there is a possibility that the lithium-ion battery will be charged by the charger for the lead-acid battery. If the rechargeable lead-acid battery is charged with a charger, even if the battery voltage exceeds the allowable charging range, it will still be charged, and it will become an overcharged state.

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