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

A lithium battery pack and detection device technology, applied in the direction of measuring devices, lithium storage batteries, secondary batteries, etc., can solve the problems of inconsistent parameters, high voltage, inconsistent battery charge and discharge performance, etc., to achieve convenient and accurate detection, reasonable structure design, Detect the effect of small cost

Inactive Publication Date: 2014-10-01
IANGSU COLLEGE OF ENG & TECH
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  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0017] figure 1 It is a schematic diagram of the voltage signal acquisition of a single battery in the present invention. The lithium battery pack composed of single cells in series is to connect the positive pole of each single battery to the negative pole of another single battery. After the series connection, the voltage of each single battery is getting higher and higher, even up to several hundred volts. The voltage detection signal is drawn from the connection between the positive pole of the battery and the negative pole of the battery, and the difference between the two voltage detection signals of the negative pole and the positive pole of each single battery can be detected to know the online voltage value of the single battery. In the same way, it can detect the online monomer voltage value of a battery pack composed of any single battery in series.

[0018] figure 2 It is a schematic diagram of the online detection principle of the present invention. An online ...

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/48G01R31/36
CPCG01R31/3835H01M10/052H01M10/482Y02E60/10
Inventor 贲礼进陈继永浦振托
Owner IANGSU COLLEGE OF ENG & TECH
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