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

Dielectric Immersion Cooling

dielectric immersion cooling ssytem

Dielectric immersion cooling for a battery pack is perhaps the ultimate method of controlling cell temperatures. Dielectric Fluid: an electrically non-conductive liquid that has a very high resistance to electrical breakdown, even at high voltages. The cells are immersed in a dielectric and the dielectric then flows through a heat exchanger to extract the heat. … Read more

Passive Cooling

Passive battery cooling

Passive cooling means the battery cell or pack is not actively cooled, instead it relies on heat conduction, radiation and convection. This heat transfer will apply in both directions, to and from the environment. Passive cooling should be the starting assumption for all battery pack designs, the drive cycles and user cases could set requirements … Read more

Battery Cooling Options

Forced Air Cooling

There are many battery cooling options, which is better or best depends on the cell selection and application. There is no right and wrong. However, let’s look at them and at a first attempt list of advantages and disadvantages. Note: all of the images show a section through cylindrical cells, but each of these cooling … Read more

Specific Heat Capacity of Lithium Ion Cells

The specific heat capacity of lithium ion cells is a key parameter to understanding the thermal behaviour. From literature we see the specific heat capacity ranges between 800 and 1100 J/kg.K Heat capacity is a measurable physical quantity equal to the ratio of the heat added to an object to the resulting temperature change. Specific … Read more