Hi all
Looking at numerous post here or elsewhere it seems very important to avoid overtemperatures in battery pack.
I have made temperature simulation of an infinite battery pack (compacted cells closely tightened) in standard conditions.
A map of temperatures accross a quarter of a cell is appened where the center temperature is about 10°C higher than the side with air convection.
If we use a good thermal conductor between each cell (such as a copper sheet) of sufficient thickness (here 2 mm), another simulation of an infinite battery pack shows a great decrease of the temperature gradient between the center of a cell and the side which is about 2.5 °C in the same state : 4 fold decrease.
To well see the pictures, please click on them to display temperatures scale.
We can see that the hot area is also reduced to the right center of the cell.
It seems attractive to insert such passive cooler between batteries to reduce temperature stress and therefore improve battery life.
What do you think of ? I have also seen people showing polymer insulation sheets between cells in order to improve electric insulation (but increasing also core cell temperature) and even insulating threaded rod which compress cells together.
Your comments will be welcomed.
Looking at numerous post here or elsewhere it seems very important to avoid overtemperatures in battery pack.
I have made temperature simulation of an infinite battery pack (compacted cells closely tightened) in standard conditions.
A map of temperatures accross a quarter of a cell is appened where the center temperature is about 10°C higher than the side with air convection.
If we use a good thermal conductor between each cell (such as a copper sheet) of sufficient thickness (here 2 mm), another simulation of an infinite battery pack shows a great decrease of the temperature gradient between the center of a cell and the side which is about 2.5 °C in the same state : 4 fold decrease.
To well see the pictures, please click on them to display temperatures scale.
We can see that the hot area is also reduced to the right center of the cell.
It seems attractive to insert such passive cooler between batteries to reduce temperature stress and therefore improve battery life.
What do you think of ? I have also seen people showing polymer insulation sheets between cells in order to improve electric insulation (but increasing also core cell temperature) and even insulating threaded rod which compress cells together.
Your comments will be welcomed.