Charging management system applied to lithium ion battery and lithium ion battery pack

Abstract

The invention provides a charging management system applied to a lithium ion battery and a lithium ion battery pack. The charging management system comprises an external power supply, a single lithium ion battery or the lithium ion battery pack and an intelligent charging management circuit which is connected in series between the external power supply and the single lithium ion battery or the lithium ion battery pack, wherein the circuit comprises a Buck-Boost module, a voltage and current detection module, a power detection module, a battery core voltage and temperature detection alarm module, a logic control module, a feedback module and a charging current setting module. According to the charging management system provided by the invention, the maximum value of charging current can be set; when the external power supply is within a certain voltage range, limitary-voltage constant current charging can be realized; at the early stage of a charging process, high-current constant current charging can be performed; when the lithium ion battery or the lithium ion battery pack is close to full charge, a charging current set value can be automatically and gradually reduced to perform low-current limitary-voltage constant current floating charge; and input low voltage, input high voltage, battery core over-voltage, charging over-current and battery over-temperature protection are also realized.

Description

technical field [0001] The invention relates to an intelligent management system for a lithium ion battery and a lithium ion battery pack, in particular to a charging control system therein. Background technique [0002] The traditional backup power source is lead-acid battery, but lead-acid battery has low energy density, large volume, short cycle life and high maintenance cost, so it has become a trend to be replaced by lithium-ion battery. However, replacing lead-acid batteries with lithium-ion batteries requires a process. The charging voltage output by the current power supply system can fully charge lead-acid batteries, but may not be enough to fully charge lithium-ion batteries. In order to be compatible with lead-acid batteries, improve the ability to adapt to a wider charging voltage range, overcome the shortcomings of lithium-ion batteries that are not resistant to overcharging and over-temperature, prolong the service life, and ensure the safe and efficient applic...

AI Technical Summary

Problems solved by technology

[0002] The traditional backup power source is lead-acid battery, but lead-acid battery has low energy density, large volume, short cycle life and high maintenance cost. It has become a trend to be replaced by lithium-ion battery

However, it takes a process for lithium-ion batteries to replace lead-acid batteries. The charging voltage output by the current power supply system can fully charge lead-acid batteries, but may not be enough to fully charge lithium-ion batteries.

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