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Lithium polymer battery with many advantages

Lithium polymer battery with many advantages

Polymer lithium battery adopts aluminum-plastic flexible packaging in structure, and can be conveniently made into square, strip and other shapes in processing. It is a relatively safe type of battery, with more than 1,000 charge and discharge times, and is widely used, such as: mobile phones

A&S Power Lithium Polymer Battery

We all know that after using a mobile phone for a long time, the battery will not last long, why? Is there any way to improve it?

First of all, the charging and discharging of lithium batteries is the result of mutual conversion between electrical energy and chemical energy. Long-term excessive discharge will lead to a decrease in the activity of chemical energy inside the lithium battery. charging once a day), the lifespan may be shortened.

Therefore, the more fundamental reason why the battery is not durable is caused by over-discharge. It is very simple to improve the cause if you know the reason. If the battery is not over-discharged, its loss and life can be improved. To put it bluntly, it is to charge the mobile phone when it has no less than 20% power, and do not let the power be low enough to automatically shut down. Do this, and the battery will be more durable and last longer, which is the correct way to charge your phone.

A&S Power Lithium Battery

Basic knowledge of lithium batteries: nominal voltage, capacity, power, charge and discharge rate.

Voltage: The nominal voltage of a single cell is 3.7V, the full charge is 4.2V, and the final voltage is 3V;

The nominal voltage of the two cells is 7.4V, the full charge is 8.4V, and the final voltage is 6V.

Battery no-load voltage > battery load voltage
Capacity: The amount of charge a battery can hold or discharge, the more the better.
The 1200mAh capacity means that the maximum working time is about 1h at the current release speed of 1.2A.
Power: voltage * capacity

Charge and discharge rate: It is an important indicator to measure the charge and discharge of the battery, usually represented by the letter C. 1C means that it is an ordinary lithium battery. The maximum charge and discharge speed should not exceed the amount of charge it can hold or release in one hour. For ordinary batteries, C is usually omitted on the silk screen on the appearance; on the contrary, for power batteries, C must not be printed on the silk screen. omitted. A battery larger than 1C is a power battery, and the maximum charge and discharge rate is the amount of charge it can hold or release in one hour * charge and discharge rate.

Let me give an example to explain the difference between a 1C battery with a capacity of 2400mAh and a 3C battery.
1C: The maximum charge and discharge current is 2.4A;
3C: The maximum charge and discharge current is 2.4*3=7.2A

Therefore, the power battery can provide a greater load current in a short period of time, and is suitable for high-current occasions. This kind of custom power battery is used in electric tools such as hand drills used in daily life. Of course, for power batteries with a rate of 10C and higher, it should not be the polymer lithium battery mentioned in this chapter, but other batteries with smaller internal resistance, because the higher the battery rate, the higher the requirements for the internal resistance of the battery. The smaller it is, the smaller its own loss.

Lithium battery charging knowledge: linear charging, switching charging
Linear charging characteristics: the advantage is that there are few peripheral components in the circuit, and the space of the circuit board is limited; the disadvantage is that the setting charging current is low and cannot be charged quickly

Switching charging features: the advantage is that the charging current is large, and it can be charged quickly; the disadvantage is that there are many peripheral components in the circuit and the required space is large
Here I will explain the problems I have encountered in my use: after unplugging the adapter, the voltage of the battery terminal is poured into the power input terminal; during the charging process, the battery is hot-swapped and unplugged, which causes the indicator light to indicate abnormally; different chips have different ICs. Similarly, if you want to study in detail, read and understand the data manual, and choose the appropriate solution according to your actual needs!

Lithium battery protection board knowledge: with overcharge, overdischarge, short circuit protection

The purpose of the battery protection circuit is to ensure safety during overcharging and discharging, and to prevent deterioration of characteristics. The protection circuit of the lithium-ion battery is composed of a protection IC and two power MOSFETs. The protection IC monitors the battery voltage and switches to an external power MOSFET to protect the battery when there is an overcharge or discharge state. The function of the protection IC is over Charge protection, over discharge protection and over current/short circuit protection.

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