Starter battery (motorcycle, car battery) repair technology
1. Startup battery (motorcycle, car battery) repair technology 1.
Observation and inquiry 1. Ask about the age of the battery and whether it has
been left for a long time (battery left for a long time is prone to severe
sulfurization, so a small current can be used to remove sulfur first) or whether
the battery is still in use. Has it been repaired? Is there any serious
self-discharge (if the self-discharge is serious, the electrolyte needs to be
replaced).
2. Observe whether the appearance is intact, whether there is any leakage,
and whether the pole is damaged (this type of battery can be repaired or not).
Whether the electrolyte in the battery has dried up or is very low (you can
first add dilute sulfuric acid with a specific gravity of 1.28g/cm3 to between
the upper and lower horizontal lines).
3. Observe whether there is serious deformation of the internal plates of
the battery (it may be scrapped if this happens).
4. Use specific gravity to absorb the electrolyte in each cell, repeat
several times, and observe whether the electrolyte is turbid (some electrolytes
are clear, ask whether the customer has replenished water or replenished the
solution himself).
2. Preliminary test 1. Use a hydrometer to check whether the proportions
between cells are balanced. Detect single cell lagging situation. Generally,
batteries with serious single cell lagging behind have a low repair rate.
2. Connect the battery to the high-frequency activator (the red clip is
connected to the positive terminal of the battery, and the black clip is
connected to the negative terminal of the battery), turn on the activation power
switch, and observe the change of the voltmeter pointer:
① Display the battery voltage: adjust the current knob (if the battery
voltage is lower than 6V, the instrument will automatically protect. At this
time, you can press the reset button and then adjust the current knob) and
observe the changes in the ammeter and voltmeter. If the current does not change
and the voltage rises to a very high level of about 40V, this type of battery is
generally severely sulfurized and can be repaired by slowly removing the sulfur
with a small current. If the current can be adjusted to a very large value, you
can use high current to charge the battery for about three or four minutes.
Observe whether there is smoke coming out of the liquid injection hole. If there
is, the bus bar of the battery may be damaged and you may consider scrapping
it.
② Display the output voltage of the activator (the output voltage of the
activator is about 48V). If the voltage does not drop after a few minutes
(excluding the fuse problem on the activation line), it can be judged that the
battery is open circuit. If the voltage drops slowly, the battery is basically
severely vulcanized. ※Based on the above factors, determine whether to receive
the battery, register the customer after receiving it, and clean the outside of
the battery.
3. Repair steps 1. Use a high-frequency activator to charge the battery
with a current of 0.1C (C represents the battery capacity, for example, for a
battery with a capacity of 50Ah, the charging current is: 0.1×50=5A). When the
battery voltage is charged to 14.7V, use a hydrometer to detect the specific
gravity of single acid and record it. Then adjust the current to 0.05C to
perform pulse desulfurization and repair. Test the acid specific gravity of a
single cell of the battery in about 10 hours. If the acid specific gravity does
not change, the battery vulcanization fault can be ruled out. If the acid
specific gravity increases but does not meet the requirements (normal acid
specific gravity value is 1.28g/cm3), continue desulfurization and repair. If
the acid specific gravity does not change after long-term sulfur removal and
does not meet the requirements, the acid specific gravity needs to be
readjusted. If the acid specific gravity reaches the requirement, the pulse
desulfurization repair can be stopped.
※If the battery is repaired through sulfur removal and self-discharge is
not serious, the repair can be considered completed.
2. After the above operations, if the electrolyte of the battery is
severely turbid or the self-discharge is severe (the active material falls off
and deposits on the bottom, causing the positive and negative electrodes to
overlap), eliminate the internal hard short circuit. Then the electrolyte needs
to be replaced to solve the problem.
First, use the discharge current of C10 (C represents the battery capacity,
for example, for a battery with a capacity of 50Ah, the discharge current is:
50÷10=5A) to discharge the battery to 0V, and pour out the electrolyte (you can
pour it into plastic filled with lime) container to avoid corrosion and
environmental pollution). If there are granular brown substances in the poured
electrolyte, the active material of the positive plate has fallen off seriously,
and the battery can be scrapped directly. After pouring out the electrolyte,
clean the inside of the battery with boiling water until the poured water is no
longer turbid, and finally clean it again with distilled water.
※The assembly space of some batteries is tight, and impurities cannot be
poured out from the injection hole after settling at the bottom. In this case,
it is necessary to drill holes at the bottom of the battery. Each grid is
independent, so six holes need to be drilled (when drilling, you can first pour
out part of the internal electrolyte and leave the impurities in one corner).
After cleaning, remove the pitted surface, and then use AB glue or Other
acid-resistant glue for sealing. Inject the electrolyte after 24 hours.
3. After cleaning, inject electrolyte with a specific gravity of 1.34g/cm3,
and then use a high-frequency activator to charge the battery to 14.7V with a
current of 0.1C. Then reduce the current to 0.05C and charge for about 10 hours.
After fully charging, measure the specific gravity of each cell to see if it
meets the requirements. If it does not meet the requirements, make a blend.
4. Measure the battery capacity after one day of rest. Once it meets the
standards, it can be handed over to the customer for use. If self-discharge
still exists, it can be treated as a scrap battery.
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