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As is well known, lithium batteries are convenient to use and have a wide range of applications, playing an increasingly important role in the development of the national economy and people's lives. Lithium batteries have advantages such as small size, high energy density, low memory effect, high cycle life, high battery voltage, and low self discharge rate. However, unlike nickel cadmium and nickel hydrogen batteries, lithium batteries must consider safety during charging and discharging to prevent characteristic degradation. Due to the high energy density of lithium batteries, it is difficult to ensure their safety.

Lithium batteries require high voltage and current during the charging and discharging process. Overcharging, discharging, and overcurrent can damage the battery or other circuit components, seriously affecting the battery's service life and safety.In an overcharged state, when the battery temperature rises, there will be excess energy, and the electrolyte will decompose to produce gas, which poses a risk of spontaneous combustion or rupture due to the increase in internal pressure; On the contrary, in an excessive discharge state, the decomposition of the electrolyte leads to the deterioration of battery characteristics and durability, thereby reducing the number of rechargeable times. Therefore, it is necessary to protect lithium batteries from overcharging, over discharging, overcurrent, and short circuits.Lithium battery protection chips have emerged, which have functions such as overcharging detection, over discharging detection, charging overcurrent detection, and discharging overcurrent detection. They can play a role in overvoltage protection, undervoltage protection, charging overcurrent protection, and discharging overcurrent protection, effectively protecting the safety of lithium battery use.Therefore, lithium battery protection chips are widely used in various fields such as consumer, industrial, and automotive.

Product Introduction

Recently, Nanxin Technology has launched a new single lithium battery protection chip - SC5618.

The SC5618 series is a primary protection chip for single string lithium-ion/polymer rechargeable batteries. By monitoring the charging and discharging voltage and current of the lithium-ion battery in real-time, the chip can control the external charging and discharging MOS to turn off when the voltage or current of the battery is abnormal, providing precise protection functions to ensure that the battery operates under relatively safe working conditions.

The SC5618 series chips detect battery voltage through the VDD power supply pin, and monitor the charging and discharging current of the system by measuring the voltage at both ends of the external sampling resistor. When the charging and discharging voltage or current of the system is abnormal, the series chips will control the external charging and discharging MOS to turn off through the CO and DO pins, causing the battery to enter the corresponding protection state.

The SC5618 series chips support overvoltage protection (OVP), undervoltage protection (UVP), primary discharge overcurrent protection (DOC1), secondary discharge overcurrent protection (DOC2), short circuit protection (SC), and charging overcurrent protection (COC).

SC5618 integrates high-precision voltage detection, achieving room temperature± 15mV, -20~60 ℃± An OV accuracy of 20mV and a DOC1 and COC detection accuracy of 0.75mV. At the same time, precise delay circuits are integrated internally, which can achieve precise triggering when triggering protection.

In addition, SC5618 also has optional 0V charging ban function and OV Latch function, which is more flexible in adapting to user application scenarios.

SC5618 adopts a DFN6L package of 6Pin 1.5mm * 2mm * 0.4mm, mainly used in terminal products such as mobile phones, tablets, and single string battery packs that require high accuracy in battery charging and discharging voltage and current.

Main functions:

SC5618 two-level protection application:

The SC5618 series protection chip supports the use of two sets of chips in series, thereby achieving primary and secondary protection for lithium batteries and enhancing system robustness.

Summary

The high-precision single string lithium battery protection chip recently launched by Nanxin Technology can provide complete protection functions for single lithium-ion batteries, including battery overvoltage protection, battery undervoltage protection, charging and discharging overcurrent protection, and load short circuit protection. It also integrates high-precision delay circuits internally, which can achieve precise protection of batteries and bring customers better choices.