Developing a battery pack design? A good place to start is with the Battery Basics as this talks you through the chemistry, single cell and up to multiple cells in series and parallel. Batterydesign.net is one place to learn about Electric Vehicle Batteries or designing a Battery Pack.
Designed by battery engineers for battery engineers. The site is organized by system and function, thus making it easy for you to find information. When you think about designing a battery pack for electric vehicles you think at cell, module, BMS and pack level. However, you need to also rapidly think in terms of: electrical, thermal, mechanical, control and safety. Looking at the problem from different angles will help to ensure you don’t miss a critical element. This is what BatteryDesign.net is all about.
LATEST ARTICLES: the last 3 posts or list all of the posts to see what you have missed….
- Hina NaCR32140-MP10The Hina NaCR32140-MP10 is a sodium ion based chemistry cylindrical cell with a capacity of 10Ah. In the original release of this cell we saw a specification showing 12Ah (left image). However, the volume … Read more
- Types of Battery thermal management SystemsBattery thermal management (BTMS) systems are of several types. BTMS with evolution of EV battery technology becomes a critical system. Earlier battery systems were just reliant on passive cooling. Now with increased size (kWh … Read more
- Sources of Error with the Coulomb Counting MethodIt is really important to understand the sources of error with the coulomb counting method as this forms the backbone for most SOC estimation algorithms. SoC Estimation by Coulomb Counting is based on the … Read more
If you are interested in writing about battery packs just reach out to us. BatteryDesign.net welcomes all newcomers, experts to contribute to the growth of knowledge in the battery design field of electric vehicles.
The main chemistry we use at the moment is lithium-ion, however, there are many variations on this. The cathode is a lithium transition metal oxide, eg manganese or cobalt or a combination of transitional metals: LCO, LMO, NCA, NMC, LFP, LMFP. The anode is normally a graphite-based material, which can intercalate or release lithium, this can have a percentage of Silicon to increase the capacity. Alternatively the anode can be Lithium Titanate (LTO).
The design and engineering of the cell is a complex systems approach that requires many specialists. As a battery pack designer it is important to understand the cell in detail so that you can interface with it optimally. It is interesting to look at the Function of the Cell Can or Enclosure and to think about the relationship between the Mechanical, Electrical and Thermal design.
When designing a battery pack you will always be asked to benchmark it. For this there are a number of key metrics:
Quick Links below to take you to the OEM Battery Pack Benchmarking
A to Z lists all of the key pages and topics alphabetically. A great place to look if you are struggling to navigate around the subject.
The Battery Management System (BMS) is the hardware and software control unit of the battery pack. This is a critical component that measures cell voltages, temperatures, and battery pack current. It also detects isolation faults and controls the contactors and the thermal management system. The BMS protects the operator of the battery-powered system and the battery pack itself against overcharge, over-discharge, overcurrent, cell short circuits, and extreme temperatures.
Current Sensors – you need to measure the current when charging and discharging the pack. What options do you have?
Contactors – the basics and sizing a contactor.
Fuses – how do you select a fuse.
Abbreviations & Jargon – Too much jargon and abbreviations in the battery design arena make it difficult to break into. To this end we have started a list with explanations and links to deeper articles.
C-rate – a measure of the rate at which a battery is charged or discharged relative to its capacity. It is the charge or discharge current in Amps divided by the cell capacity in Ampere-hours. A 1C rate means that the discharge current will discharge the entire battery in 1 hour.
We have a growing list of Calculators designed to help estimate some parameters around the field of batteries and electrification.