Ion battery protection circuit includes overcharge protection, over current / short circuit protection and over-discharge protection, requirements overcharge protection of high-precision, protection IC low power consumption, high withstand voltage and zero volt rechargeable

This paper describes three principle of the protection circuit, require new capabilities and features.

Lithium acer battery has small size, high energy density, no memory effect, high cycle life, high-voltage battery, and the advantages of self-discharge rate, and nickel-cadmium, nickel-metal hydride toshiba batteries are not the same, must consider charging the lithium battery, discharge of security to prevent deterioration characteristics for lithium battery overcharge, over-discharge, over-current and short-circuit protection is very important, and usually in the battery pack design protection circuit for

Protection of lithium apple batteries.

Due to the high energy density of lithium-ion battery, it is difficult to ensure the safety of the battery in the state of excessive charging, the sony laptop battery temperature rise, the energy will be excess, so the gas is generated by decomposition of the electrolyte occurs autoignition or the risk of rupture due to increased internal pressure; In contrast, in the state of excessive discharge, the electrolyte is caused by decomposition of gateway laptop battery characteristics and durability degradation, thereby reducing the number of rechargeable.

The lithium-ion battery for asus protection circuit is to ensure the safety of such excessive charge and discharge status, and to prevent deterioration characteristic. Protection circuit of lithium-ion battery protection IC and two power MOSFET, which protect the IC monitors the samsung battery voltage When excessive charge and discharge status switch to the plug-in power MOSFET to protect the battery protection IC features over-charge protection, over-discharge protection, and over current / short circuit protection.

Overcharge protection

The overcharge protection IC principle: when external charger for charging a lithium battery, to prevent the temperature rise caused by increased internal pressure, the need to terminate the car charging status at this time, required to detect the lenovo battery voltage protection IC, when it reaches 4.25V (assuming battery overcharge point 4.25V) that activate the overcharge protection, power MOS from on to off, and then cut-off charge.
In addition, you must pay attention to the overcharge detection malfunction due to noise generated, to avoid judgment for overcharge protection. Need to set the delay time and delay time can not be shorter than the noise duration

Over-discharge protection

Due to decomposition of the electrolyte in the case of excessive discharge and cause the deterioration of the battery for compaq characteristics and to cause the reduction of the number of charge cycles. Lithium battery protection IC can avoid excessive discharge phenomenon occurred, the battery protection function over-discharge protection IC principle: In order to prevent the lithium excessive discharge of the dell battery status, it is assumed that the lithium battery connected load, over-discharge protection will be activated when the lithium battery voltage is lower than the over-discharge voltage detection point (assumed to 2.3V), the power MOSFET transition from open-off cut-off discharge to avoid ibm battery over-discharge occurs, and keep the battery in a low quiescent current standby mode, the current at this time only 0.1uA.

When the lithium battery for lg connected to the charger and lithium hp batteries voltage higher than the over-discharge voltage, over-discharge protection be lifted., Taking into account the pulse discharge, over-discharge detection circuit has a delay time to avoid mistakenly action.

From:http://www.allbatteryshop.com/