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What are the commonly used electronic components for lithium ion battery protection?

1. overcurrent protector PTC:

PTC components support battery pack overcurrent protection. The device will increase linearly with the increase of temperature. When the current or temperature rises to a certain value, the resistance will change abruptly (increase), so that the current will change to mA level. When the temperature drops, it will return to normal and can be used as a battery connection piece in series in the battery pack.

PTC is often called an overcurrent protector in lithium-ion battery electronic circuits, and the cost is relatively high.

PTC, also known as overcurrent protector, is important for short circuit and overload protection of small power electronic equipment.

2. thermal switch NTC:

The NTC component can quickly sense the current and temperature changes in the circuit. Excessive temperature or excessive current can make the temperature of the bimetal in the switch reach the rated value of the switch, and the metal sheet trips off to protect the battery and electrical appliances. It is often seen in lithium-ion battery circuit protection applications.

The thermal switch NTC may not reset after the metal sheet trippers, resulting in the battery pack voltage not working.

3. fuse FUSE:

When the current in the circuit exceeds the rated value or the temperature quotient of the battery rises to a certain value, the FUSE fuse is blown to break the circuit to protect the battery pack and electrical appliances from damage;

FUSE can sense the current and temperature of the circuit. The fuse cannot be recovered after being blown. It is more troublesome to replace it in time. However, there is a self-recovering FUSE fuse on the market now.

When the ambient temperature is 20 ℃ and the self-recovering fuse reaches thermal equilibrium, 100% of the current on the line flows through the self-recovering fuse. When the ambient temperature exceeds 20 ℃, it will cause the current reduction through the self-redrawing fuse. When the ambient temperature reaches 85 ℃, the current passing through is only half of that at the ambient temperature of 20 ℃. When the flowing current reaches more than twice the rated current, the self-recovery fuse will operate.

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