Fast Equalization for Large Lithium Ion Batteries

Abstract

The use of Lithium Ion (LiIon) cells requires a battery management system to ensure that the LiIon cells can be operated safely and the battery pack will operate optimally. Lithium-ion batteries use an electrolyte that is flammable if exposed to high temperatures. Slight differences between the series-connected cells in a LiIon battery pack can produce imbalances in the cell voltages, and this greatly reduces the charge capacity. These batteries cannot be trickle charged like a lead acid battery because this would slightly overcharge some cells and would cause these cells to ignite. There are different methods used to ensure that the cells of a battery pack are not overcharged. The targeted equalizer (EQU) described here can be connected to any cell via a set of sealed relays to provide much faster equalization and higher efficiency than previous methods.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2008
Accession Number
ADA502177

Entities

People

  • Gerald Landrum
  • Thomas A. Stuart
  • Wei Zhu

Organizations

  • Naval Oceanographic Office

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Autonomous Underwater Vehicles
  • Charge Transfer
  • Circuit Boards
  • Circuits
  • Data Links
  • Dc-To-Dc Converters
  • Dissipation
  • Equalization
  • High Energy
  • High Reliability
  • Information Operations
  • Lithium Ion Batteries
  • Measurement
  • Resistors
  • Semiconductors
  • Underwater Vehicles
  • Voltage

Fields of Study

  • Materials science

Readers

  • Battery Technology and Engineering
  • Computational Modeling and Simulation
  • Electrical Engineering