Hello Yash,
SUNJ ENERGY Product Page
Please review the section in the TRM: 5.3.3 End-Of-Service Smoothing
The gauge cannot reliable give SOH% information in EOS mode, only in certain circumstances and near the end of discharge is the SOH% reported in EOS mode possibly valid. Each case requires some system evaluation. The main focus of the EOS mode is to provide an alert when the battery is nearing end of life.
Sincerely,
Wyatt Keller
Hello Yash,
Accumulator mode is essentially just a coulomb counter. So you can roughly estimate the remaining capacity based on the specified capacity and the accumulated charge. However, it can't account for self-discharge, temperature, or resistance. EOS mode does work quite well for your chemistry. Ultimately, gauging primary batteries is very difficult and all of the methods have their advantages/drawbacks.
Thanks,
Alex M.
Hi Yash,
What I mean is something as simple as:
full capacity (from cell spec) - accumulated charge = remaining charge
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Then you could divide remaining by full if you want a percentage. The only downside is that this method has some inaccuracies, for example the full capacity may vary from the spec somewhat. So the SOH could be off (over or under) and it would be impossible to tell. Also, near the end of life, the cell resistance increases dramatically. If you have large loads on the battery, its voltage drop will increase and could fall below the system's required voltage level before you anticipated.
Thanks,
Alex M.
Hello Yash,
This is the purpose of EOS mode, in EOS mode when you send the gauge_start() command to measure a pulse we take the OCV before the pulse and compare it with the current and the voltage under load. This is how we estimate the internal resistance, which is reported out as measured Z by the gauge.
It would be difficult to do this method in ACC mode since it is designed for accumulating charge. If your discharge is longer than 1 second (the sampling rate of our ADC) then you could crudely calculate the resistance with a similar method. I would not recommend this, I would recommend using the EOS mode to get an alert when the battery life is very low.
Sincerely,
Wyatt Keller
Hello Yash,
It is not possible to continuously measure impedance of the cell, the gauge is not designed for this. The gauge relies on taking a measurement of a short current burst in order to get a impedance measurement. There must be relaxation time between the pulses.
Sincerely,
Wyatt Keller
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