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Two protection schemes for lithium-ion batteries

by:dcfpower     2021-02-27
With the development of society, the application range of lithium-ion batteries has become wider and wider. Users have higher and higher requirements for the volume and capacity of the battery. Of course, the safety problems caused by high-energy density batteries have also been General concern. For ordinary battery users, they basically don't know how to maintain and protect various types of lithium-ion batteries. Currently, the more common types of lithium-ion batteries include lithium-ion cylindrical batteries, polymer lithium batteries, and lithium iron sulfate batteries. Different types of lithium batteries need to pay attention to the details in the maintenance process. The following editor illustrates how cylindrical lithium ion batteries and square lithium ion batteries are protected. The first type: Cylindrical lithium battery pack protection scheme. There is PPTC (recoverable safety device) inside the battery core for over-temperature and over-current protection. When the battery core temperature is too high or the current is too large, the PPTC will become a high resistance state, thereby blocking the battery core charging and discharging current and avoiding the battery fire and explosion. Therefore, when using cylindrical lithium-ion batteries, you must pay attention to temperature, voltage, and current. u003cpu003eu003c/pu003e The second type: square lithium battery pack protection scheme. The protection circuit has primary protection: also known as active protection (IC and mosfet), secondary protection is also known as passive protection (MHP, PTC, Fuse). The design of MHP-TA and PPTC close to the battery cell can make the MHP-TA and PPTC better sense the battery temperature. When the battery temperature rises abnormally, it can present high resistance, hinder the charging and discharging current of the battery, and ensure the safe use of the battery . To sum up, in fact, the protection or maintenance of lithium-ion batteries is very simple, and ordinary users only need to pay attention to some details. u003cpu003eu003c/pu003e Protecting lithium-ion batteries can not only increase their service life, but also involves battery safety issues. Lithium batteries may explode and endanger users. For example, a sudden explosion of a mobile phone is actually an explosion of the lithium battery pack in the mobile phone, which may be caused by an impact or a short circuit in the internal circuit. u003c/pu003e
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