Portable Bluetooth Player Spare 18650 Battery Pack Design Solution

- Mar 21, 2017 -

with the development of modern societies, entertainments have moved outdoors, many entertainment facilities also tend to be outdoors. Portable Bluetooth player's play outdoor generations sang equipped products. Due to the effect of fully portable, speakers of high quality, and integration of the special features of household utility player and Bluetooth transmissions, making it outdoor entertainment device of choice in modern society. Because of the portability requirement, for Portable Bluetooth player to provide safe, efficient, stable, lightweight, plenty of backup power solution became for a long time an important guarantee for outdoor entertaining. Portable Bluetooth player of the battery because of its unique advantages, have become the preferred this type of outdoor recreation equipment power solutions.
1) The design requirements for portable Bluetooth player backup 18650 battery pack 
For the following requirements, we imported Samsung batteries with High energy ratio, Light weight, small size, high cycle life, high safety, high voltage and consistency, operating current of player is small; Continuous power supply time shall not be less than 8 hours; Batteries should have ability of over-temperature protection and approved by UL2054; Battery weight shall not be more than 200g;Output over-current protection value we designed of lithium batteries is 15A; maximum continuous operating current is 2.2A, charged capacity 2.2Ah, which sufficiently meet the needs above. Specific design parameters are as follows:
1.The design requirements for lithium battery model
2.Parts of the circuit design requirements
A.single overcharge protection voltage
B.single overcharge recovery voltage
C.ingle over-discharge protection voltage
D.single over-discharge recovery voltage
E.current protection value for the combination battery
F.Battery over-temperature protection value (recoverable)
G.Finished battery also has short circuit, and reverse charge protection.
3.The design requirements for battery recycle life
4.Battery Dimensions design requirements: Referring to the size of finished battery
2) The designing scheme for portable Bluetooth player 18650 battery pack
1.18650 battery pack PCM: designed for rechargeable lithium batteries to protect circuit, the protection board needs to provide smart power calculation, overcharge, over discharge, short circuit, over current protection to avoid the hazard of burning and explosion because of its chemical properties.)
2.18650 battery pack Protection IC: The main function of the designing scheme is to protect the chip, we use high intelligent battery management system (SBS) to manage battery safety and electricity, and constantly monitor the situation of overcharge, over discharge, over current, short circuit occurring, so that the chip can operate in a safe, stable and efficient condition. 
3.18650 battery pack Temperature switch: mainly for temperature protection design. When the temperature of the battery reach to 75 degrees due to other usual problems, the temperature switch will achieve to over-temperature protection, when the temperature drops, automatic recovery.
4.18650 battery cell: 18650/2200mAh/3.7V Li-ion cell (Samsung)
5.18650 battery pack Field effect transistor: acting as a switch in the protection circuit, and balances the voltage across the load.
6.18650 battery pack: PVC thermal shrinkage

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