A kind of lithium battery cell voltage detection method

Abstract

The invention belongs to the technical field of lithium battery detection and particularly relates to a method and device for detecting single lithium battery voltage. The device comprises a single-chip microcomputer and two daisy chains, the single-chip microcomputer is connected with the two daisy chains respectively through SPI buses, the two daisy chains respectively comprise a plurality of cascaded lithium battery management chips LTC6803, and every lithium battery management chip LTC6803 is in series connection with a plurality of lithium batteries. The lithium battery management chips LTC6803 are adopted to detect the single lithium battery voltage, detection results are accurate, precision is high, a detecting device is higher in integration and is expanded easily, the research and development cycle is long, a circuit is simple and reliable, and the device is small in size, superior in performance and extremely suitable for a vehicle-mounted lithium battery management system.

Description

technical field [0001] The invention belongs to the technical field of lithium battery detection, and in particular relates to a method for detecting the voltage of a lithium battery cell. Background technique [0002] With the development of pure electric vehicles and hybrid vehicles, the series battery pack as an important energy storage device is a key factor affecting the performance of the vehicle. Prolonging battery life and improving battery efficiency are the key to the commercialization and practicalization of electric vehicles. Due to the existence of the bucket effect, the overall performance of the series-connected battery pack depends on the worst-performing single cell in the battery pack. In order to effectively manage the energy usage of the series-connected battery pack, it is necessary to monitor the status of the single cells in the series-connected battery pack in real time. . Among the parameters that characterize the state of the battery, the terminal...

AI Technical Summary

Problems solved by technology

Based on this scheme, if the sampling circuit is not grouped, the number of chips used is the least, and even if the price factor is not considered, it is difficult to select a general-purpose solid-state relay that meets the requirements; if the lithium battery cells are grouped, although the circuit can be modularized, but Single function, bulky, does not meet the characteristics of light weight and small size of the vehicle controller

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