Lithium battery, as a kind of energy storage equipment with high energy density, is widely used in electric vehicles, mobile devices and other fields. In order to ensure the safety performance of lithium batteries, in addition to common protection boards, a series of safety devices are also equipped to form double cover, effectively improving the safety of lithium batteries. This article will introduce the safety device of lithium battery in detail and discuss the importance of double cover to battery safety.

1. Protective plate

the protection plate is lithium battery one of the common safety devices in, the main functions include short circuit protection, overcharge protection, overdischarge protection, etc. By monitoring the voltage, temperature and other parameters of the battery, the protection board realizes the intelligent management and protection of the battery, prevents the occurrence of overcharge and overdischarge of the battery, and ensures the safe operation of the battery.

2. PTC protector

PTC(Positive Temperature Coefficient) protector is a Temperature sensitive protection element, which is widely used in lithium batteries. When the battery temperature rises, PTC protector will automatically raise the resistance, limit the flow of current, play the role of current limiting and overheating protection, and prevent the battery from overheating causing safety problems.

3. Negative Temperature Coefficient Thermistor

negative temperature coefficient thermistor is a temperature sensor that can monitor the temperature change of the battery. When the battery temperature exceeds the set threshold, the negative temperature coefficient thermistor will automatically reduce the resistance value and trigger protective measures, such as disconnecting the circuit or limiting the current, to prevent the battery from overheating.

4. Fuse

fuse is a kind of safety device, which can quickly disconnect the circuit when the battery is overloaded or short circuit, prevent the current from flowing continuously, and avoid dangerous situations such as overheating and fire of the battery. Fuse plays a vital role in battery safety protection.

5. Temperature sensor

the temperature sensor is used to monitor the temperature change of the battery. Once the temperature of the battery rises abnormally, it will send a signal to the control system in time to trigger protective measures, such as cutting off the circuit and reducing the current, ensure the safe operation of the battery.

6. Pressure release device

A pressure release device is set inside the battery. When the internal unnormal formation pressure of the battery rises, the release device will automatically release gas to reduce the internal pressure and avoid safety accidents such as explosion or fire caused by overvoltage.

in addition to the above safety devices, the structural design of lithium batteries is also very important. Double-layer shell design, fireproof material, waterproof design, etc. can effectively improve the safety performance of the battery and prevent external damage or environmental impact from causing damage to the battery.

As a kind of energy storage equipment with high energy density, lithium battery is equipped with a variety of safety devices in the design and manufacturing process, which constitutes a double cover and effectively ensures the safety performance of the battery. Through the cooperation of safety devices such as protection boards, PTC protectors and fuses, lithium batteries can operate safely under various extreme conditions, providing reliable power support for the development of electric vehicles, mobile devices and other fields.