Lithium-ion battery pack protection plate principle

Finished lithium-ion batteries consist of two important parts, lithium-ion battery cells and protection plates.

Lithium-ion battery protection board is the charge and discharge protection of series lithium-ion battery pack; it can ensure that the voltage difference between each single cell is less than the set value (generally ±20mV) when fully charged, to achieve the equal charging of each single cell in the battery pack, which effectively improves the charging effect in the series charging mode; at the same time, it detects the over-voltage, under-voltage, over-current, short-circuit and over-temperature of each single cell in the battery pack, to protect and extend the battery life; the under-voltage protection prevents each single cell from It also detects the over-voltage, under-voltage, over-current, short-circuit and over-temperature of each single cell in the battery pack to protect and extend the battery life; the under-voltage protection prevents the battery from being damaged due to over-discharge when each single cell is discharged.

Lithium-ion battery pack protection board is used to protect the battery is not discharged, not charged, not current, there is also the output short circuit protection.

The reason why lithium-ion battery pack should be protected is determined by its own characteristics. Because the material of the lithium-ion battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuit and ultra-high temperature charging and discharging, so the lithium-ion battery pack will always be followed by a delicate protection plate and a current fuse appear.

The protection function of lithium-ion battery pack is usually accomplished by the protection board and the current device such as PTC. The protection board is composed of electronic circuit, which can accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at all times under the environment of -40℃ to +85℃, and control the on/off of the current circuit in time; PTC prevents the battery from bad damage under the high temperature environment.

Lithium-ion battery protection board technical parameters

Equilibrium current: 80mA (when VCELL=4.20V)

Equilibrium starting point: 4.18±0.03V overcharge threshold: 4.25±0.05V

Over-discharge threshold: 2.90±0.08V

Over-discharge delay time: 5mS

over-discharge release: disconnect the load and each individual cell voltage is above the over-discharge threshold.

Overcurrent release: disconnect the load to release

over-temperature protection: a recoverable temperature protection switch needs to be installed

Operating current: 15A (according to customer requirements)

Static power consumption: less than 0.5mA

Short circuit protection function: can protect, disconnect the load can be self-recovery

Important functions: overcharge protection function, over discharge protection function, short circuit protection function, over current protection function, over temperature protection function, equalization protection function.

Interface meaning: the charging port and the discharge port of the board are independent of each other, both of them share the positive pole, B- is the negative pole of the connected battery, C- is the negative pole of the charging port; P- is the negative pole of the discharge port; B-, P-, C- pads are all over-hole type, pad hole diameter are 3mm; each charging detection interface of the battery is output in the form of DC pin holder.

Parameter description: Configuration of maximum operating current and overcurrent protection current value in A (5/8, 8/15, 10/20, 12/25, 15/30, 20/40, 25/35, 30/50, 35/60, 50/80, 80/100), special overcurrent value can be customized according to customer requirements.

Can lithium-ion battery packs be used without protection plates?

So far, there has not been a public claim not to use the protection plate battery manufacturers.

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