Serially-connected lithium battery set power supply equalization management system

Abstract

The invention provides a serially-connected lithium battery set power supply equalization management system comprising a battery set power supply module and a charging power supply module which is connected with the battery set power supply module through a DC power line. The battery set power supply module comprises a serially-connected lithium battery set, a voltage detection control circuit and a breaking serial-connection switching circuit. If the voltage detection control circuit detects when the serially-connected lithium battery set discharges, the difference value of a maximum voltage and a minimum voltage of each single string of battery surpasses a set threshold value, the voltage detection control circuit controls the breaking serial-connection switching circuit to break the single string of battery, of which the voltage is the lowest. If the voltage detection control circuit detects some single string of battery reaches saturation in advance during charging, the voltage detection control circuit controls the breaking serial-connection switching circuit to break the single string of battery reaching saturation in advance, and sends serial-connection number change information to the charging power supply module to adjust a charging voltage. The beneficial effects of the serially-connected lithium battery set power supply equalization management system are that the circuit is simple in structure, charging-discharging circle inside the battery set is prevented, and energy loss is small.

Description

Technical field [0001] The invention relates to the field of power supplies, in particular to a power balance management system for series-connected lithium battery packs. Background technique [0002] Lithium batteries have been widely used due to their high energy density, low self-discharge, no memory effect, environmental protection, long service life and high voltage of single-cell batteries. As the mainstream battery products for mobile devices, they are gradually becoming high-power and high-current. The development of high-voltage power supply equipment. The voltage of lithium batteries cannot meet the needs of medium and high-power devices, and multiple batteries must be connected in series to reach the input voltage required by the powered device or its power adapter circuit, or to avoid low-voltage and high-current input to reduce input circuit and rectification losses. When lithium batteries are used in series, the initial performance (such as self-discharge rate, ca...

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