EV Battery technology
The battery in all-electric cars is one of the most important parts in an EV. This technology article goes through the different aspects.
Batteries is no new technology. Already in 1802 the first battery capable for mass production was created, but it was note before 1992 that Li-ion batteries was brought to the market by Sony.
This article focus on Li-Ion batteries for EV’s and have the goal is to give you a high level understanding how stuff works and how it affect performance on EV 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 in 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 of the battery is the process to add new energy in to the battery.
Thermal managment is important for battery performance and health
The performance of lithium-ion batteries deteriorate over time whether they are used or not. This affects the performance and range of EV's.