锂离子电池保护电路中熔断器实现原理（Realization principle of fuse in protective circuit of lithium ion battery）.doc

锂离子电池保护电路中熔断器实现原理（Realization principle of fuse in protective circuit of lithium ion battery） Realization principle of fuse in protective circuit of lithium ion battery 2007-03-06 15:53 source: electronic inquiry network [comment] [big, medium, small] Introduction - lithium ion rechargeable battery use, overcharge, overdischarge and overcurrent will affect the battery life and performance and safety, charging fuse batteries as two overcurrent protection with the IC control loop effectively monitor and prevent the damage to the battery. In recent years, with the miniaturization of the mobile device and the popularity of the lithium ion rechargeable battery has a small, light weight, high output voltage, stable discharge voltage, long time storage advantages, the lithium ion rechargeable battery consumption surge electric appliance. - Li ion rechargeable battery is a rechargeable battery in a lithium battery (two rechargeable batteries). A protective circuit is placed in the battery to protect the battery from damage caused by overcharge, over discharge and over flow or improper use. As a over-current protection device, the fuse can protect the lithium-ion rechargeable battery from battery damage caused by high current and short circuit during charging or discharging. This protection route consists of two MOSFET and one control IC, plus some capacitive components. IC is responsible for monitoring the battery voltage, and gate control two MOSFET, MOSFET switches in the circuit, a charging circuit and control circuit turn-on and turn off fuse to fuse two level of protection, C2 for the delay capacitor, the circuit has overcharge protection, over discharge protection, too the current protection and short circuit protection function. Normal working condition In normal charging and discharging, the IC and D0 pins of the circuit are controlled by C0, and the V1 and V2 are all connected. The charging current flows in from the Input+ and is charged by the fuse to the battery.