EV Battery technology
The battery in all-electric cars is one of the most important parts of an EV. This technology article goes through the different aspects.
Batteries are no new technology. Already in 1802, the first battery ready for mass production was created, but it was not before 1992 that Li-ion batteries were brought to the market by Sony.
This article focuses on Li-Ion batteries for EV’s and has the goal is to give you a high-level understanding of how stuff works and how it affects performance on EVs with a specific focus on all-electric Audis.
The basic principle of a li-ion battery is that electrical energy is created by an electrochemical reaction between two metals of different affinities.
Cell & chemistry
The battery cells are the most important part of the battery system and the most important factor both for cost and performance on EV's.
The battery system is the combination of many cells and other control electronics to a complete battery to power the EV.
A battery management system (BMS) is the electronic system that manages the battery, such as by protecting the battery, monitoring its state, calculating secondary data as range, and performing balancing of cells.
Cell balancing is important to get the most of the battery.
Charging the battery is the process to add new energy to the battery.
Thermal management is important for battery performance and health
The performance of lithium-ion batteries deteriorates over time whether they are used or not. This affects the performance and range of EV's.