Abstract
This paper presents an extensive study concerning a lithium-ion battery system for constructing high-performance power source systems intended to make advanced environmental vehicles a practical reality. Battery performance must be predicted and designed with higher accuracy in order to achieve performance attributes suitable for such power source systems. For example, more quantitative approaches for improving battery power output are needed that are based on a thorough understanding of the fundamental processes which take place in a battery. In line with these perspectives, we constructed a simulation model of electrode reactions and charge transport processes and used it to examine the effects of different factors on battery performance.This approach is considered to be promising for the construction of a high-performance battery system for EV application. Higher battery performance can be expected from optimization of the electrode parameters. With regard to specific power in particular, the present study examined the possibility of improving battery power output during a short duration.This paper describes how the concept of short-duration power output might be derived from the electrode characteristics and discusses its potential effects on the overall battery system. It also presents the results of simulations that examined the battery system from the standpoint of thermal behavior.
Highlights
There are strong needs today for the development and widespread use of high-performance environmental vehicles owing to concerns about the tightening of energy supplies and global warming resulting from the continued increase in massive energy consumption
Electrical vehicles (EVs) and hybrid electric vehicles (HEVs) have long topped the list of promising environmental vehicles, and R&D activities for these vehicles have been under way for many years
From around the middle of the 1990s, we have long argued on the basis of our analyses and experimental substantiation that lithium-ion batteries can be adapted to a wide range of vehicle applications from HEVs to plug-in hybrids and even EVs, by taking an innovative approach to the electrode design so as to obtain the power characteristics required by each vehicle type
Summary
There are strong needs today for the development and widespread use of high-performance environmental vehicles owing to concerns about the tightening of energy supplies and global warming resulting from the continued increase in massive energy consumption. From around the middle of the 1990s, we have long argued on the basis of our analyses and experimental substantiation that lithium-ion batteries can be adapted to a wide range of vehicle applications from HEVs to plug-in hybrids and even EVs, by taking an innovative approach to the electrode design so as to obtain the power characteristics required by each vehicle type. Power characteristics need to be analyzed from the standpoints of the reactions of the active materials used in the positive and negative electrode assemblies, electron conductivity and ion transport. Based on these viewpoints, the relationship between the maximum specific power and specific energy of batteries was analyzed numerically. This paper presents a study of approaches for further improving the performance of lithium-ion batteries, for EV application, and discusses battery system characteristics from the dual perspectives of power and thermal performance
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