Protection panel for lithium batteries

Lithium battery protection plate is the charge and discharge protection of series lithium battery. When full of electricity, the voltage difference between individual cells is less than the set value(generally ± 20 mV), and the charging effect of individual cells in the battery pack is effectively improved. At the same time, the overpressure, underpressure, overcurrent, short-circuit and overtemperature of each single cell in the battery are detected to protect and extend the service life of the cell. The undervoltage protection prevents the battery from being damaged by overdischarge during discharge use of each single cell.

There are two main parts of the finished lithium battery composition, lithium battery core and protective plate, lithium battery core mainly consists of positive plate, diaphragm, negative plate, electrolyte; Positive plate, diaphragm, negative plate winding or lamination, packaging, perfusion electrolyte, packaging is made into a core, the role of lithium battery protection plate many people do not know, lithium battery protection plate, as the name implies is to protect lithium batteries. of, The role of the lithium battery protection plate is to protect the battery but put, but fill, but the flow, and there is also output short circuit protection.

Technical Parameters of lithium battery Protection Plate

Balanced current: 80mA(VCELL = 4.20 V)

Balanced starting point: 4.18 ± 0.03 V overcharging limit: 4.25 ± 0.05 V(4.30 ± 0.05 V optional)

Over gate limit: 2.90 ± 0.08 V(2.40 ± 0.05 V optional)

Extending: 5 mS

Overrelease: Disconnect the load, and the voltage of each single battery is higher than the over-release threshold;

Overflow release: Disconnect load release

Overtemperature protection: There is an interface and a recoverable temperature protection switch needs to be installed;

Working Current: 15A(according to customer selection)

Static power consumption: "0.5 mA

Short circuit protection function: can protect, disconnect load can self-restore.

Main functions: overcharge protection function, overdischarge protection function, short-circuit protection function, overcurrent protection function, overtemperature protection function, equilibrium protection function.

Interface definition: The charging port and the discharge port of the plate are independent of each other, and the two are common positive poles. B-is the negative electrode connecting the battery and C-is the negative electrode of the charging port; P-is the negative electrode of the discharge port; B-, P-, and C-solder discs are all perforated, and the diameter of solder disk holes is 3mm; The battery charging inspection interface is output in DC pin form.

Parameter description: maximum operating current and overcurrent protection current value configuration, 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 overflows can be customized according to customer requirements.

Why do some lithium protective panels need to be activated?

Detailed analysis of protective plate principle of lithium battery

As we all know, lithium batteries are new energy batteries that are used in various fields. However, lithium batteries need protection of protective panels. Many people do not know that protective panels play a crucial role in battery use. Here is a look at the structure of protective panels and their protection principles.

The protection plate has two core components: a protection IC, which is a reliable protection parameter obtained by an accurate comparator. The other is that the MOSFET string acts as a high-speed switch in the main discharge loop and performs protective actions. IC controls the MOS tube by monitoring the voltage difference of the battery. Ordinary protection plates also have resistors, capacitors, and auxiliary FUSE, PTC, NTC, ID, and memory. The B + and B-on the protection plate are respectively connected to the core positive and negative poles. P + and P-are the positive and negative poles of the protective plate output, respectively. The figure is a schematic diagram of a protective plate:

Why do some lithium protective panels need to be activated?

The protection plate will overcharge the battery, overdischarge protection, short-circuit protection, overcurrent protection, and temperature protection.

Lithium batteries require constant current and constant pressure when charging. In the initial stage of charging, the constant current is charged. With the charging process, the voltage rises to a certain value and is converted to constant pressure charging until the current becomes smaller and smaller. When the battery is charged, if the charging circuit loses control, the voltage will continue to charge after it exceeds a certain value, and the battery voltage will continue to rise, which will cause battery damage or safety problems. When there is a protective plate in the cell, the overcharge protection function of the protective plate will be activated and the MOS tube will be cut off, prohibiting the charging of the battery pack and protecting the safety of the cell.

In the same way as other types of protection, the protective plate will always monitor the various conditions of the battery and take protective measures.

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