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

Jul 10, 2019   Pageview:773

Military radar:


It is a military electric device utilizing electromagnetic wave for exploration. The electromagnetic wave launched by radar irradiates the target and receives the echo. By this way can it discover the target and search the location, motor direction, running speed and other features. Given that it needs to meet the special requirements on military, it is necessary for the backup battery to provide constant power at -40℃ and satisfy the examination standard of combating and  shooting.


application environment

place

■indoor ■outdoor

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

图片1.png


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