Online detection device and method for voltage of battery end of lithium battery pack

Abstract

The invention discloses an online detection device and an online detection method for the voltage of a battery end of a lithium battery pack. The device comprises the lithium battery pack composed of a plurality of single lithium batteries by connecting in series, a selection analogue switch, a subtractor, an A/D (Analogue/Digital) conversion circuit and a main control chip MCU (Micro-programmed Control Unit); a connection end led out from each single lithium battery in the lithium battery pack is connected with an input end of the selection analogue switch; an output end of the selection analogue switch is sequentially connected with the subtractor, the A/D conversion circuit and the main control chip MCU. The detection method comprises the following steps that: the connection end led out from each single lithium battery in the lithium battery pack is connected with the input end of the selection analogue switch and an output signal is sequentially processed by the subtractor, the A/D conversion circuit and the main control chip MCU. The online detection device is reasonable in structural design and has the advantages of small detection cost and convenience and accuracy for detection; the precise online detection of the end voltage of each single battery of the lithium battery pack which has the higher voltage and more quantity can be accurately realized.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to the field of management and control of battery packs for electric vehicles and grid energy storage. Background technique [0002] At present, lithium-ion batteries are widely used in various fields of industrial production and people's life, especially a lithium battery pack management and control technology for electric vehicles and grid energy storage. In order to obtain high power and high voltage, batteries must be used in series and parallel, but the parameters of each battery cell are inconsistent, resulting in inconsistent battery charge and discharge performance. In order to make the charging and discharging capacity of each single battery tend to be consistent and prolong the service life of the battery pack, it is necessary to manage each single battery, and the core of management is how to detect the voltage of the single battery online. There are many batteries c...

AI Technical Summary

Problems solved by technology

In order to obtain high power and high voltage, batteries must be used in series and parallel, but the parameters of each battery cell are inconsistent, resulting in inconsistent battery charge and discharge performance

In order to make the charging and discharging capacity of each single battery tend to be consistent and pro

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