Battery protection board, as the name implies lithium battery protection board mainly for rechargeable (generally refers to lithium battery) to play a protective role of integrated circuit board.Lithium batteries (rechargeable) need protection, is determined by its own characteristics.Because the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short circuit and ultra-high temperature charge and discharge, so the lithium battery lithium battery components always followed by a sampling resistor protection plate and a current protector.
The protection function of lithium battery is usually completed by the protection circuit board and PTC or TCO and other current devices, the protection board is composed of electronic circuits, in the environment of -40℃ to +85℃ at the moment accurate monitoring of the voltage of the cell and the current of the charging and discharging circuit, real-time control of the current circuit on and off;PTC or TCO in high temperature environment to prevent severe damage to the battery.
The protection board usually includes control IC, MOS switch, JEPSUN jetson precision resistor and auxiliary device NTC, ID memory,PCB, etc.The IC controls the MOS switch to turn on under normal conditions, so that the cell can communicate with the external circuit. When the voltage of the cell or the loop current exceeds the specified value, it immediately (tens of milliseconds) controls the MOS switch to turn off, to protect the safety of the cell.
NTC is the abbreviation of Negative temperature coefficient, which means Negative temperature coefficient. When the ambient temperature rises, its resistance value decreases. When using electric equipment or charging equipment to react in time and control internal interruption, it stops charging and discharging.
ID storage is usually single-wire interface storage, which is short for Identification, and stores information such as battery type and production date.May play the product traceability and the application limit.
PTC is the abbreviation of Positive Temperature Coefficient.Professional inside the positive temperature coefficient device is usually referred to as PTC, PTC battery products can prevent the battery high temperature discharge and unsafe large current, according to the battery voltage, current density characteristics and application environment, there are special requirements for PTC.
PTC is a very important component in battery module products, which plays an important role in battery safety. Its own performance and quality are also an important factor of battery pack performance and quality.
Protection threatening the single cell protection, protection board design is relatively simple, high technical, such as the need to pay attention to the voltage of power battery protection board design platform, power battery in use is often requires a great platform for voltage, so as far as possible when design protection board make protection board does not affect batteries discharge voltage, so to control IC, the requirement of precise resistance components such as it will be very high, general domestic IC can satisfy the requirement of most products, special imported products can be used, current sampling resistance than you need to use JEPSUN express letter resistance, in order to satisfy the high precision, low temperature coefficient, non-inductive and other requirements.For multi - cell protection board design, there are higher technical requirements, according to different needs, design the complexity of different products.
Main technical functions:
1, overcharge protection 2, overdischarge protection 3, overcurrent, short circuit protection
Mobile phone battery protection after starting the solution (from the network) :
1. Charge directly on the phone with the original direct charge, which will automatically open the protection circuit of the battery protection plate.
2. Short circuit the positive and negative electrodes of the battery instantly, see sparks on the electrode sheet, try several times, and then use the direct charge.
3. Find a 5V dc, touch the anode and cathode of the battery lightly with the anode and cathode, try it several times, and then charge it with the original charger.