Introduction to the wiring circuit and method of lithium battery protection
board. As a safety protection device for lithium batteries, the protective board
must not only work reliably within the normal operating current range of the
equipment, but also act quickly when the battery is accidentally short-circuited
or overcurrent to protect the battery core. The principle of lithium battery
protection board is very simple, and it is also simple to make. The requirements
for customers must be very clear, down to the component model, process
requirements, voltage requirements, current requirements, output port
connection, charging, etc.
Lithium batteries are usually divided into two categories:
Lithium metal battery: Lithium metal battery is a battery that uses
manganese dioxide as the positive electrode material, metallic lithium or its
alloy metal as the negative electrode material, and uses a non-aqueous
electrolyte solution.
Lithium-ion battery: Lithium-ion battery generally uses lithium alloy metal
oxide as the positive electrode material, graphite as the negative electrode
material, and a non-aqueous electrolyte.
Lithium battery protection board wiring circuit and method
The wiring methods of each lithium battery protection board are different
depending on the number of series, and the wiring methods of the same port and
separate ports are also different. If you want to be precise about each product,
please check the protection board details page, but the overall wiring remains
unchanged. Due to the active nature of lithium batteries, a protective plate
must be installed when using lithium batteries to prevent overcharge, discharge
and overcurrent of the lithium battery. Let me introduce how to wire the lithium
battery protection board.
The lithium battery protection board is to protect the charge and discharge
of the series-connected lithium battery pack; when fully charged, it can ensure
that the voltage difference between each single cell is less than the set value
(generally ±20mV), achieving even charging of each single cell in the battery
pack. , effectively improves the charging effect in series charging mode;
simultaneously detects the overvoltage, undervoltage, overcurrent, short
circuit, and overtemperature status of each single cell in the battery pack to
protect and extend the service life of the battery; undervoltage protection
enables each When a single battery is discharged, it can prevent the battery
from being damaged due to over-discharge.
Lithium-ion batteries are both batteries + protection boards. The 3 wires
will only appear on the protection board, and the battery will always only have
2 wires. There are two types of lithium-ion batteries. Obviously the 3.7V one is
non-aluminum iron phosphate and can be replaced directly.
Replacement is very simple (pay attention to the positive and negative
poles)
1: Remove the packaging of the original lithium battery, and then use a
soldering iron to separate the protective plate and battery.
2: Similarly, remove the protective plate of your new lithium battery and
connect the battery to the old protective plate.
P+, P- are connected to the output. B+ is connected to the positive
electrode of the battery, and B- is connected to the negative electrode. If
multiple cells are connected in series, the negative electrode of B1 and the
positive electrode of B2 are connected together, and so on, the negative
electrode of the last battery is connected to Bn-. Solder the wires first and
connect the battery last, don't make the wrong connections. If there is no
output after completion, remember to use the charger to activate the charging
interface led by P+ and P-.
The third wire of some lithium batteries is a temperature protection wire,
and some are battery information verification wires (for example, if a
non-original battery is replaced, an alarm will be prompted). Lithium-ion
batteries are both batteries + protection boards. The 3 wires will only appear
on the protection board, and the battery will always only have 2 wires. There
are two types of lithium-ion batteries. Obviously the 3.7V one is non-aluminum
iron phosphate and can be replaced directly.
How to connect the 36V lithium battery protection board?
1. First connect 12 lithium batteries in series. If there are 24 sections,
they can be connected in parallel first and then in series!
2. Connect the negative terminal of the battery pack according to B.
B1_B2_B3,,,,B10_B1l_B2 in sequence
3. Same interface: the positive electrode of the lithium battery pack is:
the positive electrode for charging and discharging. C: Can be used as the
negative electrode for charging and discharging.
4. Branch interface: The positive electrode of the lithium battery pack is
the positive electrode for charging and discharging. C: Can be used as the
negative electrode for charging. D: It can only be used as the negative
electrode of discharge.
The role of lithium battery protection board
1. Overcharge protection to prevent damage to the lithium battery pack
caused by overcharging.
2. Over-discharge protection to prevent over-discharge from causing the
battery life to decline.
3. Overcurrent and short circuit protection make lithium batteries safer
and more reliable during use.
4. Small size, suitable for a variety of lithium battery packs.
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