7.4V 8800mAh Low-temperature Backup Battery Design Scheme of Special Application

operating temperature/humidity

-40 ～ 70 ℃； 50 ～ 90 %RH

storage temperature/humidity

-40 ～ 45 ℃； 50 ～ 70 %RH

special performance

the requirements of charging and discharging under high-temperature & low-temperature

Charge at -20 ～ 50 ℃;

Discharge at -40 ～ 70 ℃

other requirements

expiration date

One year

explosive-proof grade

/

waterproof grade

IP67

dustproof grade

/

dropping frequency

/

application features

operating voltage

5.0 ～ 8.4 V

capacity

8800 mAh

working hours

180 mins

dimension

42*90*153 mm

operating current

1-2A

maximum starting current

3 A，starting time 20 ms

maximum continuous operating current

1.5 A

frequency and time

keep using (large current when collect signal and launch electromagnetic wave)

capacity management

communication mode □SMBUS □I2C □HDQ

certification and environmental requirement of finished products

types

■ GB31241-2014（CQC）

□CE

□UL2054

□UL60950

□un38.3

□RCM

□KC

□PSE

□component verification

□BIS

□BMSI

□REACH

■ RoHS

□battery directive

□halogen-free

other:

schematic design

battery specification

LA18650-2S4P/8800mAh/7.4V

cell model

LA18650/2200mAh/3.7V

guard plate and hardware configuration 

IC

S-8252AAD

MOS

AO8814*2

PTC

/

NTC

/

other

/

encapsulation mode

□no protective circuit □PVC+ non-fundamental protection ■housing+ fundamental protection □housing+ non-fundamental protection

key parameter

nominal voltage

7.4 V

nominal capacity

8800 mAh

dimension

42*90*153mm

internal resistance

≤ 100 m Ω

weight

500 g

charging condition

1.76 A× 6.5 hours(-20℃）/ 4.4 A× 2.5 hours(25℃）

continuous discharge current

1.76 A(-40℃）/ 4.4A(25℃）

protective current

6-8 A

charging voltage

8.4 V

End-off voltage

5.0 V

cycle life

Charging and discharging requirements: charge at 0.5c, discharge at 1.0c

When leave 80% capacity, the cycle life is over 500 times.

charging temperature

-20 ～ 50 ℃

discharging temperature

-40 ～ 70 ℃

storage temperature

-40 ～ 45 ℃ (time limit）

temperature protection

/

key feature

1、It can discharge at -40～70℃: Over 80% of the capacity is maintained through 0.2C at -40℃, and over 60% through 0.5C

2、It can discharge at -20～50℃: Can keep charging through 0.2C at -20℃, and over 60% of the discharging capacity is maintained

3、The cycle life is over 500 times.

product picture