There are two main types of rechargeable batteries on the market: nickel-metal hydride batteries and lithium-ion batteries, and the problem that people are concerned about whether the batteries cannot be charged is mostly for these two types. Batteries of the same type and specification can be connected in parallel, in series and in combination to form assembled batteries with different numbers of cells. As a common phenomenon, people want to understand the reasons behind the failure of batteries and battery packs to charge and seek solutions.
The
reasons why the battery cannot be charged can be divided into the
internal reasons inherent in the battery itself and the external reasons
for the battery to charge. Lithium-ion batteries
are gradually occupying the original market of nickel-hydrogen
batteries due to their superior performance. Therefore, the lithium-ion
battery charging is mainly explained here, and nickel-hydrogen batteries
are mentioned in the difference.
The internal reasons for the battery not charging are:
1.
The battery has zero voltage or there is a zero-voltage battery in the
assembled battery. The zero voltage of the battery is either a
substandard product itself, and has not reached the corresponding
nominal capacity and voltage value when it leaves the factory, or it is
at the end of its life. Due to long-term use, the capacity is exhausted
and the voltage drop is zero.
Considering that after a long-term shelving, such as more than one year, the lithium battery
may also be fully discharged in the form of self-discharge so that the
voltage is zero. The current lithium battery protection scheme is
designed to require that the battery can be charged even when the
battery is at zero voltage. Therefore, there are two differences for the
zero voltage of the battery: one can be charged and used continuously,
and the other is completely useless; in other words, the capacity loss
of the former is reversible, while the latter is irreversible. If a
zero-voltage battery that cannot be charged is unfortunately designed
into a lithium battery pack, it may conduct a zero-voltage signal to the
battery pack through a protection chip, thereby turning off the MOSFET
and making the battery pack unable to charge.
2.
The battery pack is connected incorrectly. This situation is less
likely, because rechargeable batteries or battery packs are generally
required to be fully inspected when they leave the factory. This is the
case for batteries from regular manufacturers unless a batch of
batteries is not fully inspected when leaving the factory, and the wrong
battery pack is connected. Just unchecked. Of course, it is another
matter for products produced by informal manufacturers or personal
assembly, and connection errors cannot be completely eliminated.
Relatively speaking, the full inspection rate of NiMH battery packs is
lower, and the probability of such errors may be higher.
3.
The internal electronic components and protection circuits are
abnormal. This situation probably occurs after the battery has been used
for a long time. The aging and falling off of the electronic components
will cause abnormal battery charging, especially the electronic
components integrated into the protection circuit will directly affect
the protection function of the circuit. As a result, the charging
process cannot be properly guided.
The external reasons for the failure of charging in the charging behavior are:
1.
The charger and the battery are not matched, especially the difference
in the charging current design between the mismatched charger and the
lithium battery will cause the instantaneous current to be too large
during charging, and the lithium battery will implement overcurrent
protection to stop charging. To solve this mismatch, especially pay
attention not to mix Ni-MH chargers with lithium battery chargers, and
try not to use "universal" chargers for some universal chargers.
2.
The charging equipment is faulty and there is no output voltage. In
this case, just put the battery on another charger of the same model to
charge it.
3. Unsuitable
charging environment. Both the charger and the rechargeable battery have
their own working environment. If any of the two conditions are
exceeded, the charging will not be carried out at high temperature or
low temperature.
Solving
the problem of battery not charging is nothing more than diagnosis and
treatment. The order of diagnosis is the external cause first and then
the internal cause, because the problem of the charging method only
needs to be corrected, while the internal cause requires professional
battery knowledge and battery testing equipment to draw a correct
conclusion. If you can't solve it yourself, you can get a professional
maintenance network for maintenance.
BENZO Energy Technology Co.,Ltd
UFine Technology Co., Ltd
Site: www.bz-battery.com / www.benzoenergy.com
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