From a technical point of view, the current cannot exceed 350mah. From a calculation point of view, it is necessary to calculate the nominal current
,
Assuming that the battery. the voltage is When 3.0 V reaches 3.6 V, the capacity becomes saturated.
According to the formula: C=(Vwork+
Vmin)It/(
Vwork?
< p>-Vmin?)
Calculation: 1.4A=(3.6+3.0)V*I* 3600s/(3.6?-3.0?) V
We conclude that I=0.2A, which is the charging current.
The actual charging may be more important because the effect of resistance on voltage must also be taken into account.
For application of the calculation formula, please see My Space Conclusion.
Does lithium manganate require regular deep charging?
It should be compared to the battery of a cell phone.
1: The 3.7V you wrote should be a lithium manganese battery.
2: The requirements for its protection panel are that the cut-off of charge is 4.2V and the discharge cutoff is about 2.5V. The protection board of your used battery is also a lithium manganese oxide battery, which is fully charged. usable, but high current charging and discharging requires It depends on the power of the charging and discharging MOS used for the protection board of your old used battery.
3: But if you need to limit the current when charging your cell phone (current limiting will not damage your cell phone battery), the problem is that the maximum voltage of your battery 3.7V (no matter how large capacity) is only 4.2V. It cannot fully charge your cell phone battery. Either there is one battery that uses DC-DC boost, or two batteries are connected in series (which can be used to stabilize the voltage and charge the battery). ?
4: If you wish to purchaseFor a protection board, buy a single-cell one with a charge cutoff of 4.2 V and a discharge cutoff of about 2.5 V. The same goes for a two-cell card. , with a charge cutoff of 8.4V and a discharge cutoff of about 5V.
How to adjust the overshoot and overdischarge voltage of lithium iron phosphate batteries and lithium manganate?
No need.
When using lithium manganese oxide batteries, regular deep charging is not necessary. This is because deep charging will have an impact on battery life. If the battery is frequently fully charged, its lifespan will be significantly reduced. Generally speaking, the charging method of lithium manganate batteries should be slow charging, and the charger should have overcharge protection function.
During the charging process, the battery voltageshould not exceed 4.2V. If the battery voltage exceeds 4.2V, it will affect the battery life.
It depends on the standard you follow for excessive charging and discharging. Different standards have different regulations.
There are two types of overload: the first is to create a current of 3C, and the upper limit voltage is 5V; the second is to create a current of 3 C and a voltage of 10 V.
The same goes for overdischarge, for example:
GB/T18287-2000 states that the battery should be discharged to the final voltage at 0.2 C at an ambient temperature of 20 ± 5, and discharged with an external load (30 X n) Ω for 24 hours. without fire or explosion.
GB/T1.1-2009 states that the battery is discharged with a current of 0.3 C to the end-of-discharge voltage of 2.5 V, then the battery is charged so reverse with a current of 0.3 C for 90 minutes.
You can do this according to your company standards.