Cold Temperature Charge / Discharge

lithium ion cells at cold temperatures

What are the Cold Temperature Charge / Discharge limitations and mechanisms? At cold temperatures lithium ion cells suffer from a significant decrease in available capacity. The DCIR of the cell increases significantly as the temperature decreases. Significantly reducing the available peak and continuous power. This post has been built based on the support and sponsorship … Read more

Performance Analysis of an Integrated BEV Thermal Management

Fast introducing battery electric vehicles to the market leads to the accumulation of errors and recalls of the vehicle. It can be avoided by simulating battery electric vehicles (BEV) in an integrated manner. Electric vehicle thermal management is key in optimal performance of a vehicle. A drivetrain model is developed integrated with cabin, battery, and … Read more

Types of Battery thermal management Systems

Battery 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 capacity), Voltage (V), Ampere (amps) in proportion to increased range requirements make the battery thermal management system a key part of … Read more

Tesla Fast Charge Thermal Model

Tesla fast charge thermal model building on open source data and a siemens model

Building on the Tesla fast charge thermal model that was discussed in the Siemens post: Race to the clouds: Battery thermal behavior simulation of a Tesla Model 3. This article looks at the cooling system and impact of a change in cooling direction. Starting with the model and the original Fast Charge Scenario. Fast Charge … Read more

Key Parameters for Dielectric Fluids

dielectric cooling image of cells

What are the key parameters for dielectric fluids as used in a battery pack? We take a look at a few reference papers to build an initial list. There are many options for cooling batteries. However, dielectric immersion cooling is seen as perhaps the ultimate high performance cooling method for battery cells. In this particular … Read more

What is Calorimetry?

adiabatic calorimeter designed for battery testing

Author: Mario Toubes-Rodrigo, Application Specialist, H.E.L Group Calorimetry is a branch of thermodynamics that deals with heat transfer quantification. Heat can be transferred during a variety of processes, such as chemical reactions, phase changes, or dissolution of solutes in a solvent. Calorimetry follows the first law of thermodynamics, which states that energy cannot be created … Read more

Base vs Side Cooling Cylindrical Cells

cylindrical cell base versus end cooling

Base vs side cooling of cylindrical cells is often brought up in online discussions and in many OEMs designing battery packs. We looked at this before within Thermal Conduction in a Cell, however, I think it is worth expanding this topic. The Tesla design cools the side of the cell and the Lucid Motors cools … Read more

Pouch Cell Design and Edge Cooling

Looking at the pouch cell design and edge cooling evolution allows us to appreciated the importance of battery cell electro-thermal behaviour. Fundamentally pouch cells are made from multiple layers of active material all applied to copper and aluminium electrodes that are sandwiched and compressed together. The copper and aluminium electrodes have very good in-plane thermal … Read more

Pouch Cell Cooling

Looking at the benchmarks there are a number of pouch cell cooling options that have been used and threads where we can see improvements to designs. Firstly thought it is worth just reminding ourselves of the heat generation mechanism in a battery cell. Heat Generation in a Cell can be defined quite simple for the … Read more