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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .

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Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc

Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.

Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc

Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.

release time:2025-08-27 Hits: Popular:AG11 battery
Lithium battery charging protection circuits are essential safety features that prevent overcharging, overcurrent, short circuits, and overheating during charging, safeguarding both the battery and connected devices. These circuits, typically integrated into battery management systems (BMS) or charger modules, combine analog and digital components to monitor and regulate charging parameters in real time.
The core components include a protection IC (integrated circuit), MOSFETs (metal-oxide-semiconductor field-effect transistors), current-sense resistors, and voltage-divider networks. The protection IC continuously monitors cell voltage, charging current, and temperature, triggering protective actions when thresholds are exceeded. For example, most lithium-ion cells have a maximum safe charging voltage of 4.2V ±0.05V; the IC cuts off charging via the MOSFETs if voltage exceeds this limit, preventing electrolyte decomposition and thermal runaway.
Overcurrent protection is achieved using a current-sense resistor (typically 10–100 mΩ) in series with the charging path. The voltage drop across the resistor is measured by the IC, which shuts down the MOSFETs if current exceeds a safe level (e.g., 2–5C for consumer batteries). Short-circuit protection acts even faster, responding in microseconds to prevent damage from sudden high currents.
Temperature monitoring, via a thermistor (NTC) attached to the battery, adjusts charging current based on ambient conditions. Charging is reduced or paused if temperature exceeds 45°C or drops below 0°C, optimizing both safety and charging efficiency.
Advanced designs include balancing circuits to equalize charge across cells in multi-cell packs, ensuring no single cell is overcharged. This is done via passive balancing (discharging overcharged cells through resistors) or active balancing (transferring energy from overcharged to undercharged cells), extending pack lifespan.
The circuit must also be designed for low power consumption to minimize self-discharge and include ESD (electrostatic discharge) protection to withstand voltage spikes. Testing involves verifying response times under fault conditions, thermal cycling, and long-term reliability to ensure compliance with standards like IEC 62133. By integrating these features, charging protection circuits enable safe, efficient charging of lithium batteries in applications from smartphones to electric vehicles.
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