Battery design scheme of portable B supersonic diagnostic set:

1. Guard plate (PCM): it is protective circuit of rechargeable lithium ion battery pack. Because of the chemical characteristics of lithium ion battery, it needs protective function of intelligent capacity calculation, overcharging, over-discharging, short circuit, overcurrent, etc. so as to avoid combustion, explosion, etc.

2. Protection IC: it is the chip has main protective function in the design scheme. The chip monitors the cell on the functions of overcharging, over-discharging, overcurrent, short circuit, etc. at any time, which helps the battery works under safe, stable and efficient circumstance.

3. 18650 lithium ion battery: 18650 Li-ion cell (BAK)

4. MOSFET: it works as the switch in protective circuit to make sure that the voltages of two ends won’t be up and down, so that the voltage will be stable.

5. Capacity controlling chip (BQ2085): it is a full-function capacity survey meter with ADC of voltage and temperature, and ADC of current measurement and charging sensor. This survey meter has a microprocessor to work on capacity measurement, including massage of remaining state of capacity. BQ2085 chip can also display run time to empty. The host machine can search for these information at any time and send them to the customer. It is very convenient for user to control battery capacity by using capacity survey meter.

6. The capsulation of battery pack: plastic case