Tablet smart lithium battery design

The generation of tablet PCs has revolutionized the world's computer technology, due to its own portability, ultra-thin, and versatility. The requirement for backup backup power is relatively high. Compared with the conventional standard column lithium battery, the polymer lithium battery has become the first of such high-end consumer electronic products due to its high capacity space utilization, arbitrary variability in size, ultra-thinness, high safety and reliability. .
First, the tablet computer smart battery program design requirements:
According to the customer's requirements and specifications, design the tablet smart battery pack for the host computer, integrate the smart fuel gauge with communication protocol (SBS communication protocol) and battery safety protection performance into your solution to reach the battery pack and Host information sharing, and ultimately achieve a reasonable, efficient and safe battery management solution, the entire design requires the finished battery to have high ultra-thin, high capacity, high cycle life, high security, high consistency and so on.
Specific design parameters are required:

1. Battery selection requirements: domestic first-line brand polymer batteries (PL5159115-2S1P/3.8Ah/3.7V).
2. Design requirements: The whole product is wrapped with PET synthetic paper, which is elegant and generous.
3. Circuit design requirements: accurate power management circuit + secondary overvoltage protection circuit. The SBS intelligent battery management system design scheme is used to effectively manage the remaining battery power from time to time.

Second, tablet smart battery solution design:

1. 9PIN output connection terminal: MIN connection terminal, line type meets customer output current requirements. The output is defined as 3/P+, NTC, SMBC, SMBD, 3/P-, etc.
2. Smart Fuel Gauge Protection Board (PCM): The SBS intelligent battery management system uses the advanced power calculation principle to accurately calculate the battery power from time to time, and reports the battery power information to the host through SMBUS, and simultaneously to the rechargeable smart battery pack. (Generally referred to as lithium battery) for protection function, due to the chemical characteristics of the lithium battery itself, it is necessary to provide overcharge, over discharge, short circuit, over current and over temperature protection functions to avoid the danger of burning, explosion and so on.
3. Temperature protection device (one-time): The temperature protection selected for the secondary overvoltage protection in the circuit is mainly to detect the battery cell voltage. When the single voltage of the battery group is higher than 4.45V, the temperature is promoted by the peripheral circuit. The protection device operates, disconnects the circuit, and protects the entire battery pack from overvoltage.
4. Overcurrent protection sheet (BREAKER recoverable): With overcurrent and temperature detection function, the overcurrent protection sheet operates when the current reaches 12A or the temperature reaches 75°C. When the temperature drops, the overcurrent protection sheet resumes normal operation.
5. PL5159115/3.8Ah/7.4V polymer lithium battery (ATL): large capacity, ultra-thin, high safety, high consistency and so on.
6. Design schematic: