Protective plate for series lithium battery pack based on battery protective chip

Abstract

The invention discloses a protective plate for a series lithium battery pack based on a battery protective chip. The protective plate comprises a plurality of single lithium battery protective modules, a low battery warning signal driving circuit, a discharging protective signal driving circuit and a charging protective signal driving circuit; each lithium battery in the series lithium battery is correspondingly provided with a lithium battery protective module; the single lithium battery protective module comprises a first battery protective chip and a second battery protective chip; the first and second battery protective chips are used for realizing controlling charging and discharging through monitoring the battery voltage connecting the positive power supply input terminal and the negative power supply input terminal, and overcurrent detecting the voltage difference between the terminal and the terminal of the negative power supply input terminal; and the single lithium battery protective module corresponding to the single lithium battery at the negative end of the battery pack further detects whether the loop of the overall battery pack is in overcurrent or short circuit through a current sampling resistor. The protective plate provided by the invention has the functions of high voltage protection, low battery warning, low voltage protection, short circuit protection and the like.

Description

technical field [0001] The invention relates to the technical field of energy and automatic control, in particular to a design method and device for a novel serial lithium battery protection board. The present invention is applicable to 2 to 32 electric motorcycles, electric bicycles, electric scooter for the disabled, electric recreational vehicles, golf carts, electric ATVs, light electric vehicles and other electric vehicles, AGV trolleys, storage Energy devices and mobile power systems. Background technique [0002] Due to the limited energy of a single power battery and the low terminal voltage, electric vehicles, energy storage devices, and power systems need to use multiple batteries to be combined in series and parallel to form a power battery pack. Lithium-ion batteries use lithium-containing compounds as positive electrodes, carbon materials as negative electrodes, and organic electrolytes as chemical energy storage devices for electrolytes. It has no metal lithi...

AI Technical Summary

Problems solved by technology

When the lithium-ion battery pack using this battery protection board is in use, once the voltage of one of the single cells is found to be lower than the over-discharge protection value, the main circuit of the battery pack will be automatically cut off in order to protect the battery pack. At this time, the running electric vehicle It will suddenly lose power, which will bring danger and make operation very inconvenient; equipment using energy storage devices and mobile power supplies will suddenly lose power, causing the equipment to suddenly stop running, losing data, and causing irreparable losses

At the same time, when the battery protection board is under over-discharge protection, the battery pack may be in the state of high-current discharge, and suddenly cutting off the main circuit of the battery pack will generate a huge surge impact and damage the equipment.

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