Communication battery module charging current-limiting strategy

Abstract

The invention provides a communication battery module charging current-limiting strategy which comprises a battery management system integrating a main control module, a voltage temperature detectionmodule, a current detection module and a charging MOS (metal oxide semiconductor) transistor. The battery management system detects voltage, temperature and charging current of a battery pack in realtime and provides battery pack state information parameters for execution of the charging current-limiting strategy. The main control module starts and stops a charging current-limiting function according to whether there is a mains supply or not, performs related calculation and controls the charging MOS transistor to execute the charging current-limiting strategy under different battery pack states according to battery pack state information. The charging current-limiting strategy can effectively balance safety and charging efficiency of a communication battery module during charging, prolong service life of the battery module, ensure the battery module to be constantly in a standby power state within an allowed condition range and effectively lower circulating current when multiple battery modules are parallelly connected in use.

Description

technical field [0001] The invention relates to the technical field of battery system charging control, in particular to a communication battery module charging current limiting strategy. Background technique [0002] With the advancement of science and technology, lithium battery technology is changing with each passing day, and its scope of use has also been greatly expanded, such as electric vehicles, energy storage power stations, isolated island micro-grids, and communication backup power supplies. In the field of communication backup power supply, lithium batteries are gradually replacing traditional lead-acid batteries due to their advantages of no pollution, high energy density, large charge and discharge rate and long cycle life. At present, in the field of communication power supply, 15-16 series lithium iron phosphate battery modules are being used instead of lead-acid batteries to form a 48V DC backup power supply for communication loads. According to different r...

AI Technical Summary

Problems solved by technology

Since lithium batteries are different from traditional lead-acid batteries, they belong to a new emerging energy product. The performance and cycle life of lithium batteries are greatly affected by battery temperature and charge and discharge current, such as: high current impact, low temperature and high current charging , high temperature and high current charging lead to thermal runaway, etc., the charging and discharging equipment does not have a perfect voltage and current control strategy for the battery module, so the battery module must strictly control the charging and discharging process of the battery pack based on the use environment and battery pack state parameters during use

[0003] The current charging current limiting strategy, one is: the charging current limiting function of the battery module is always on, and it cannot be turned off. The battery module can only be charged by current limiting, which seriously reduces the charging efficiency. In the state of not being fully charged, in the case of a long-term power outage of the mains, it cannot provide enough power to the electrical equipment, causing the equipment to shut down; the other is to first determine whether to enable the charging current limiting function according to the total voltage of the battery pack, and the current limiting function After being turned on, it will be turned off again after charging for a few minutes. There is no solution to the charging strategy of the battery pack under low temperature and high temperature conditions. There is a situation where the battery pack quickly reaches the protection condition at the end of charging and the charging cutoff causes the battery pack to not be fully charged. There is also a large problem. Potential safety hazards, reducing the cycle life of battery modules, etc.

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