paraskevas
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- Joined
- Aug 8, 2017
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- 71
in one single pack !!!!!!!!! . ( all together ) ( 14s320sp) .... your opinions please !
wim said:320s ... 1184v...just one question .... Why ? :s
DarkRaven said:4x 14S80P is the same as 14S320P as you would put these modules in parallel anyway, you are just splitting the 320P packs. This is how Tesla builds its batteries for the cars, only they put their modules, as they call it, in series for higher voltage.
You can also build smaller packs like 7S40P and put these in series and in parallel. This only effects handling and, to a certain extent, cabling.
14S320P is just the electrical specification of a battery and doesn't dictate its physical shape.
paraskevas said:in one single pack !!!!!!!!! . ( all together ) ( 14s320sp) .... your opinions please !
mormor1971 said:paraskevas said:in one single pack !!!!!!!!! . ( all together ) ( 14s320sp) .... your opinions please !
That's a interesting discussion I think.
As I can see it there are several pro's and con's to having large 320P blocks and then 14 of the in series obviously.
First and foremost a 320P cell pack would weigh in at around 16kg not including busbars and cell holders, and it would be quite large at say 8x40 /10x32/ 16x20 depending on layout and size restrictions.
Then there's the issue with finding and replacing broken cells and heaters, how do you identify those easily?
What about having a spare cell pack so you can replace a cell pack while you service it as above?
I think that having smaller cell packs, f.ex. 8x15 cell packs in parallel would be a better option as you could then have smaller and easier manageable cell packs that could be serviced individually a lot easier as long as you make them easy to remove from the 14S busbars connectors.
One issue with having large packs is that it would be a lot harder to identify underperforming cells / cell packs as you have no easy way to detect is a smaller cell-pack is on the way out unless you put shunts in each pack and then measure the current / power delivered by each individual cell pack. Each cell-pack would also need it's own temperature sensors and while you're at it you could even fan cool them and make a cell-pack management module (call it a CPMS) and have each cell pack monitor itself via a isolated I2C bus f.ex. Essentially cooking your own Batrium but with higher balancing capacity and more temperature sensors per cell pack.
I kind of like that idea, having individually managed cell packs with shuntsthat you then connect in parallel / series to get the capacity you need. They can be easily expanded, just add another cell-pack in parallel, as long as their individual CPMS have individual addresses they can be added to the same I2C bus with a simple connector. You could use Anderson connectors for each cell-pack and a smaller connector, say a DB9 connector for I2C bus andcentral power / cell voltage / currentmeasurements.
What do you think, am I overcomplicating things again?