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What is a Battery Protection Board
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The battery protection board is mainly an integrated circuit board that protects a rechargeable battery (generally is a lithium battery). The reason why lithium batteries (rechargeable type) need protection is determined by its own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, over discharged, overcurrent, short circuited, and ultrahigh temperature charge and discharge, the lithium battery assembly will always follow a protection board with a sampling resistor and a current fuse.
The protection function of a lithium battery is usually completed by a protection circuit board and a current device such as a PTC or a TCO, and the protection board is composed of an electronic circuit. Accurately monitor the voltage of the cell and the current of the charging and discharging circuit in the environment of -40℃ to +85℃, and instantly control the on and off of the current circuit. The PTC or TCO prevents the battery from being damaged in a high temperature environment.
The protection board usually includes control ICs, MOS switches, JEPSUN precision resistors and auxiliary devices NTC, ID memories, PCB, and the like. The control IC controls the MOS switch to conduct under all normal conditions, so that the cell communicates with the external circuit, and when the cell voltage or the loop current exceeds the specified value, it immediately controls the MOS switch to turn off (tens of milliseconds)，thus protecting the safety of the battery cell.
NTC is an abbreviation for Negative Temperature Coefficient. When the ambient temperature rises, its resistance decreases, make electrical equipment or charging equipment to react in time to control internal interruption and stop charging and discharging.
The ID memory is often a single-line interface memory, and the ID is an abbreviation for Identification. Information such as the type of battery and the date of manufacture can be used to product traceability and application restrictions.
PTC is the abbreviation of Positive Temperature Coefficient. In the professional, the positive temperature coefficient component is usually referred to as PTC. In the battery product, the PTC can prevent the high temperature discharge and the unsafe large current. According to the voltage, current density characteristics and application environment of the battery, the PTC has special requirements.
PTC is a very important component in battery packs and plays an important role in battery safety. Its performance and quality are also an important factor in battery performance and quality.
When the protection board protects a single cell, the protection board design is relatively simple. The technically higher place is, for example, the voltage platform problem that needs attention in the design of the power battery protection board. The power battery is often required to have a large platform voltage in use, so when designing the protection board, try to make the protection board not affect the discharge voltage of the battery cell. This will require high requirements for control ICs, precision resistors and other components. General ICs can meet most product requirements, and current sampling resistors require JEPSUN resistors to meet high precision, low temperature coefficient, and no inductance. For multi-cell protection board design, there are higher technical requirements, and products with different degrees of complexity are designed according to different needs.
The main technical functions: 1. overcharge protection; 2. over discharge protection; 3. over current, short circuit protection.Frequently Asked Questions -
