Secondary battery degradation determination device

Abstract

Provided is a secondary battery degradation determination device for an emergency power source in which a plurality of battery groups each having a plurality of batteries connected in series are connected in parallel, wherein the secondary battery degradation determination device is capable of accurately determining degradation of each battery, is simple and can be manufactured at low cost, and, in particular, allows a means for generating a measurement current containing an AC component to be simple and compact. The secondary battery degradation determination device includes: a plurality of voltage sensors (7) connected to respective batteries (2); a discharge circuit (9) connected in parallel to battery groups (3); and discharge control means (11e). The discharge control means (11e) drives a switching element (27) to be opened and closed so that a current flowing through the discharge circuit (9) has a pulse shape or the like. The voltage sensors (7) each measure a voltage value of an AC component. An internal resistance calculation unit calculates an internal resistance on the basis of the measured value, and a determination unit determines degradation of the batteries (2) on the basis of the internal resistance.

Description

[0001] related application [0002] This application claims the priority of the application number of JP Japanese Patent Application No. 2016-054774 with the filing date on March 18, 2016, and by referring to the whole, this is incorporated as the content which constitutes a part of this application. technical field [0003] The present invention relates to a deterioration judging device for judging the deterioration of a secondary battery used as an emergency power supply in a data center, a mobile phone base station, or other various power supply devices requiring stable power supply. Background technique [0004] In data centers, mobile phone base stations, etc., stable power supply is important, and AC commercial power is used when it is stable. However, as an uninterruptible power supply when the AC commercial power stops, an emergency power supply using a secondary battery is equipped. The charging method as an emergency power supply includes the trickle charging type ...

AI Technical Summary

Problems solved by technology

However, no device has been proposed that can accurately determine the deterioration of multiple batteries in large-scale emergency power supplies such as data centers and mobile phone base stations.

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