The backup battery of portable bluetooth player has become the first choice for this kind of outdoor entertainment equipment power supply solution because of its own unique advantages. Then let's take a look at the design scheme of portable Bluetooth player lithium battery with our Lithium Battery manufacturer.

     1. Design regulations for the spare lithium battery of portable bluetooth player:

The playback software has a small working current, but the battery is required to continue working for at least 8 hours of continuous operation. The battery should have a temperature protection function. At the same time, it is stipulated that the finished battery shall pass the UL2054 certification and the weight of the battery shall be controlled within 200g.

     For this reason, our company uses imported Samsung batteries, which have the advantages of high energy ratio, light weight, small size, high cycle life, high safety, high voltage and good consistency. The lithium battery pack is designed to output overcurrent protection value. 15A, the maximum continuous working current is 2.2A, and the charging capacity is 2.2Ah, which fully meets the power time requirements of the playback software. The specific design parameters are as follows:

1) Lithium battery pack model design regulations: 18650-3S1P/2.2Ah/11.1V.

2) Design regulations for the circuit part:

1. Single cell overcharge protection voltage: 4.35±0.25V

2. Single cell overcharge recovery voltage: 4.15±0.50V

3. Single cell over-discharge protection voltage: 2.40±0.08V

4. Single cell over-discharge recovery voltage: 3.00±0.10V

5. Combined battery overcurrent protection value (10ms): 10~17A

6. Combined battery temperature protection value (recoverable): 70±5℃

7. The finished battery has short circuit and reverse charge protection.

3) Design requirements for battery cycle life: 300~500 times (national standard charge and discharge standards)

4) Design requirements for battery dimensions: refer to the battery dimensions of finished products

    Design scheme of spare lithium battery for portable bluetooth player:

1) Protection board (PCM): It is mainly a protection circuit designed for rechargeable lithium battery packs, mainly because of the chemical characteristics of the lithium battery itself, which need to bring intelligent power calculation, overcharge, overdischarge, short circuit, overcurrent, etc. Protective function to avoid dangers such as burning and explosion.

2) Protection IC (ProtectionIC): The main protection chip of the design scheme, which carries out on-line monitoring of overcharge, overdischarge, overcurrent, short circuit and other functions of the battery cell, so that the battery cell is safe, reliable, stable and efficient. jobs.

3) Temperature switch: Mainly designed for temperature protection function. When the temperature of the battery itself reaches the range of 70±5℃ due to other abnormal problems, the temperature switch will act to carry out temperature protection

4) 18650 lithium ion cell: /18650/2200mAh/3.7VLi-ioncell (Samsung).

5) Field effect tube (MOSFET): MOSFET, which acts as a control switch in the protection circuit, always keeps the voltage at both ends of the load from increasing or decreasing, ensuring that the voltage is relatively stable.

6) Battery packaging: PCV heat shrink