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Lithium ion battery management system

A lithium-ion battery and management system technology, applied in the field of lithium-ion battery management systems, can solve the problems that the internal resistance of lithium-ion batteries cannot be directly obtained, and achieve the effects of reducing withstand voltage requirements, prolonging service life, and ensuring safety

Inactive Publication Date: 2012-01-04
HEBEI JIANTOU NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion battery is a highly nonlinear system, so the internal resistance of the lithium-ion battery cannot be directly obtained

Method used

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  • Lithium ion battery management system
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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] Figure 1 Shown is the connection block diagram of the MCU and each unit, the battery pack 1002 is connected with the lithium-ion battery pack charging and discharging equalization unit 1001 and the battery detection unit 1003, the battery detection unit includes a voltage detection unit 1005, a current detection unit 1006 and a temperature detection unit 1004, Each detection unit is connected to the three ADs of the corresponding sub-board MCU1007 to complete the connection between the MCU and each unit.

[0043] 1. Negative feedback principle and implementation of battery management

[0044]The negative feedback method of the present invention is to detect the voltage of the single battery, and according to the voltage difference of different single batteries, the control circuit controls the battery single or battery pack to dynamically withdr...

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Abstract

The invention discloses a lithium ion battery management system and a control method thereof, and comprises battery charge and discharge management scheduling, battery information communication and battery life assessment. Adding a battery cell in series or withdrawing the battery cell in a controlled manner is realized by utilizing a switch circuit. Data transmission between series battery cells is realized by utilizing hardware and software forwarding circuits. In a rated charge and discharge condition, through carrying out charge and discharge tests on a lithium ion battery repeatedly, recording charge and discharge times, and voltage curve and battery internal resistance of each charge and discharge operation, constructing a four-dimensional data table, and determining equivalent cycle times and present full charge capacity of the battery by utilizing an interpolation method, an equivalent cycle life of a battery pack is determined. According to the invention, energy transduction devices like an inductance capacitor are not needed, characteristics of batteries in a same battery pack tend to be consistent, a service life of the battery pack is prolonged, overpressure resistant requirements of each component are mitigated, a basic basis of estimating battery full charge capacity and accurate estimation of a battery life is established, and possibility of large scale interchangeability application is provided.

Description

technical field [0001] The present invention relates to a lithium-ion battery management system, in particular to a lithium-ion battery management system and a control method thereof, specifically to a charge equalization system for a power lithium-ion battery pack, a battery pack information management system, and a single battery during floating charging. Determination of the full charge capacity in the floating state, and calculate the battery life through the influence of impedance characteristics and temperature. Background technique [0002] Battery and its management system (BMS) is a key technology in the field of electric vehicles. However, the research in this area in our country is still far from perfect, and there are still many problems that cannot be solved. [0003] The first problem to be solved by the battery management system is the charging and discharging balance of the lithium-ion battery pack. The role of equalization is to use electronic technology to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 李练兵杜仲刚刘哲刘秀芳
Owner HEBEI JIANTOU NEW ENERGY CO LTD
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