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Q: ... what do think about Bottom Balancing LPF 100A/Hr Lithium Ion batteries? Your thoughts would be appreciated.
A: Bottom balancing would counteract what the BMS cell modules try to do as they will keep trying to balance at the top voltage. There is an idealogical point of view that if you bottom balance the battery pack it will never go out of balance and you won’t need a BMS.
This is not based on evidence or on science and simply does not work in my experience.
Judging by the number of people coming to us for a BMS for previously purchased cells it would appear that quite a number of customers agree.
Q: Why do I need a Battery Management system?
A: Lithium Ion batteries are made up of two or more cells connected in series. Each cell has a slightly different capacity due to manufacturing tolerances and environmental conditions. After several charge/discharge cycles the cells begin to go out of balance and so a balancing system is required to keep the cells all at the same state of charge. The BMS also prevents overcharge and overdischarge of any cell in the battery which is essential when using Lithium Ion batteries.
Q. Why does the EV2 master unit use the battery pack for its power. Why not 12V input so it can run off the vehicle auxiliary 12V supply.
A. It can be modified to run from any voltage 12V - 350VDC. However first and foremost it is most important that the cell module signal loop must be isolated from the master unit power input otherwise a signal wire accidentally contacting a battery terminal can make the 12V auxiliary system live at potentially fatal voltages. Some imitation BMS systems do not do this, dangerous!
Q: Why does the EV Power system use solder connections for the signal loop rather than removable terminals.
A: For complete reliability. The cell modules are there for the life of the battery so there is no reason to use removable lugs.
Q: What digital outputs does the BMS provide?
A: Most of our BCUs now support RS232 output of one record of status information per second.
Q. What charger should I use?
A: Almost any switchmode SLA charger with the correct peak voltage is suitable. However there may occasionally be problems with cell balancing due to the incorrect charge curve. Our dedicated LFP chargers are recommended.
Q: Will the BMS work if the batteries are in different locations around the car?
A: Yes... However, it is advisable to keep all the cells in one physical location if at all possible. Cable resistances, temperature and moisture differences in different locations of the car can result in unforseen problems and shortened battery life. This has nothing to do with the BMS, it is about design and common sense. Also placing batteries in car crumple zones SIGNIFICANTLY COMPROMISES SAFETY in the event of an accident. Remember that batteries are the fuel tanks of an EV and due consideration should be given to locating them, even at the expense of load space. It is also important to maintain weight distribution between the front and rear axles of a car.