Talking about the self-protection function of lithium ion battery
Shenzhen Benwei battery is a professional battery supplier. Its main products are: lithium batteries, lithium ion batteries, electric vehicle batteries, power batteries, energy storage batteries, medical lithium batteries and various industrial configuration batteries. Lithium-ion battery is a widely used rechargeable battery. It has high single working voltage, small size, light weight, high energy density, long cycle life, can be fully charged in a short time and allowable discharge temperature range Leniency and other advantages. In addition, lithium-ion batteries have the advantages of low self-discharge current, no memory effect, and no environmental pollution. Its global supply and lithium battery suppliers are continuously increasing. According to the report of the market research company, the global supply of lithium rechargeable batteries in 2007 increased by 17% over the previous year. With the expansion of the use of lithium batteries, the charging and discharging protection of lithium-ion batteries becomes more and more important. With the increase of lithium battery suppliers, the safety of lithium battery-powered equipment is currently the most concerned issue, so its protection is very important. Lithium battery protection mainly includes over-charge protection, over-discharge protection, over-current and short-circuit protection.
1, overcharge protection
When the charger overcharges the lithium battery, it is necessary to terminate the charging state in order to prevent the internal pressure from rising due to temperature rise. For this reason, the protection device needs to monitor the battery voltage, and when it reaches the battery overcharge voltage, it activates the overcharge protection function and stops charging.
2, over-discharge protection
In order to prevent the over-discharge of the lithium-ion battery, when the voltage of the lithium battery is lower than its over-discharge voltage detection point, the over-discharge protection is activated, the discharge is stopped, and the battery is kept in a low quiescent current standby mode.
3, over current and short circuit protection
When the discharge current of the lithium-ion battery is too large or a short-circuit condition occurs, the protection device will activate the over-current protection function.
4. Protection of multi-cell lithium circuit
The rated voltage of single lithium-ion battery is 3.6V, which cannot meet the needs of high-voltage power supply occasions. Therefore, it is necessary to use multiple lithium-ion batteries in series. For this reason, all relevant power management control integrated circuit manufacturers have launched their own multi-cell lithium battery (lithium battery pack) protection integrated circuit chips. The feature of this type of product is to monitor the charge and discharge status of 3 or 4 lithium batteries. Realize overcharge, overdischarge and overcurrent protection.
