ntc thermistor for battery (2) [호환 모드] · 2018. 11. 14. · at4-awg30-m 267 343 197...
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NTC Thermistor for Temperature
Sensor in Battery Pack
Technical Report
2011. 11. 1.2011. 11. 1.
LATTRONLATTRON
Requirement for Battery Pack
pack
thermistor
cell
PCB
Low profileStrong enough to touch Thin head
Strong overcoat
Strong enough to bendHard to be scratchedon packing or handling
Strong lead
High insulation
on packing or handling
Strong enough to fold
Easy for soldering
Regular pitch
Easy for soldering
Comparison with the Products in the Market
4 types of NTC thermistor are suggested for battery pack
Head strength, lead strength, and dielectric strength are main factor for selection.
TypeInsulated wire
typeEnamel wire type
Film type(LNJT103F0)
FG1(LNFK103F)
Head strength, lead strength, and dielectric strength are main factor for selection.
Lead material AWG30 / Epoxy Cu / Enamel Alloy42/Polyimide Cu-Sn/Polyimide
Head profile D 2.3mm D 2.0mm T 0.50mm typ T 0.50mm typ
Lead wire D 0.8mm D 0.2mm T 0.25mm T 0.25mm
Pitch regular irregular fixed fixed
AppearanceAppearance
Thermal Reliability of Film type NTC Thermistor
Reliability
0.8%
1.0%
△R/R25
0.2%
0.4%
0.6%
0.8%
-0.4%
-0.2%
0.0%
0.2%
0 200 400 600 800 1000
Dry Heat Thermal Shock
-1.0%
-0.8%
-0.6%
time (hr)
Dry Heat Thermal Shock
Damp Heat Cold
time (hr)
Resistance change of all types are within ±1.0% (allowance) .
Response on Surface Temperature Variation
Variation of surface temperature is measured.
Response time is defined as thermal time constant, which is dependent on the structure
and shape.
LNF series shows the 2nd good response activity.
model TTC (sec) remarkmodel TTC (sec) remark
LNJT103F3 3.3 Film
LNFK103F 4.6 FG1
ET-CP0.16 7.5 Enamel
AT4-AWG30 11.1Epoxywire
Durability on Mechanical Pressure
Static pressure is applied on the head with a constant speed.
Every type shows its characteristic behavior.
LNF series (FG1) shows the strongest with least variation.
From Left
LNFK - FG1 typeLNFK - FG1 type
103F0 - Film type
103F3 – Silicon coated
103JT – Japan103JT – Japan
AT4 - Wire type
ET - Enamel type
Model Average (N) Maximum (N) Minimum (N)
LNFK103F (FG1) 343 343 343
LNJT103F0 170 217 94
LNJT103F3 280 343 134
Best reliabilityBest reliabilityamongamong
comparatives.comparatives. LNJT103F3 280 343 134
SM103JT 275 343 137
AT4-AWG30- M 267 343 197
ET-CP0.16 - M 68 113 24
SM103JT, AT4-AWG30-M, and ET-CP0.16-M are Japanese product.
comparatives.comparatives.
SM103JT, AT4-AWG30-M, and ET-CP0.16-M are Japanese product.
Lead Frame Bending Test
Bending Test Setup
• Folding endurance tester
• Bending to ±90° 로 bending, Stop
Result Summary
• Stable strength is shown at LTR’s, with average
16.5.• Bending to ±90° 로 bending, Stop
bending if Open is measured.
• Tensile load : 1N
• Number of bending is counted
16.5.
• Bending strength is weaker in the region without
film, showing strongest at LTR’s sample.
• Number of bending is counted
before failure
30
35
TheAverageNumberofBending@Openfail
16.5
19.520
25
TheAverageNumberofBending@Openfail
DUT
electricconnection
16.5
11
5
10
15
TheAverageNumberofBending@Openfail
±90° bending
tensileload
connection
0
5
LTR Semitec Joinset
TheAverageNumberofBending@Openfail
Prod-A Prod-B±90° bending
Vendor name
Comparison of Film Property
Polymer film NTC chipPolymer film NTC chip
Solder
Adhesive
lead frame
Item Lattron Prod-A
LTR provides halogen-free product.
Item Lattron Prod-A
Structure Both faces are made of PI film
(Halogen-free)
Surface : PI + silicone adhesive
Bottom : PE + silicone adhesive
Properties Adhesion good
High reliability under humidity
Week adhesion
Acceptable reliability under humidity
Film peeling testFilm peeling test
Film Peel Test
Shape after failure Graphic behavior value
0.38kgf
Higher peel strength is shown at LTR’s than Prod-A
LTR
0.38kgf
broken
Prod-A
0.04kgf
Peeled offProd-A Peeled off
Electrical Reliability of LTR’s 2 Series
Test item Test condition Characteristics Drift
Dry Heat TestElements are placed in a oven of temp.at 90 ± 5℃ for 1000 (+48, -0)hr.
(△R, △B) after testare less than ± 1%.
Test ConditionTest Condition
Dry Heat Testat 90 ± 5℃ for 1000 (+48, -0)hr. are less than ± 1%.
Damp Heat TestElements are placed in a chamber of temp. at85 ± 3℃ and 85 ± 3 %RH for 1344 (+48, -0)hr.
(△R, △B) after testare less than ± 1%
Dry heat test (Hrs) 0 100 500 1000
LNJT103F0 0.00% 0.20% 0.40% 0.40%
Resistance ChangeResistance Change
LNJT103F0 0.00% 0.20% 0.40% 0.40%
LNFK103F (FG1) 0.00% 0.22% 0.32% 0.35%
Damp heat test (Hrs) 0 100 672 1344
LNJT103F0 0.00% 0.16% 0.14% 0.17%
LNFK103F (FG1) 0.00% 0.15% 0.15% 0.16%
Reliability is tested with 20 samples for each model.
Resistance change after dry heat and damp heat for 1000h is almost the samefor both film(LNJT) and FG1(LNF) type.
Conclusion
LNF series shows the best mechanical stability.
Electrical properties show almost the same those of film.
LNF series is best fit for temperature sensor of rechargeable battery. LNF series is best fit for temperature sensor of rechargeable battery.
SummarySummary
item unitinsulated wire
typeCP wire type
film type(LNJT103F0)
FG1(LNFK103F)
failure on mec’l shock mJ > 18 5 10.6 > 18
SummarySummary
failure on mec’l shock mJ > 18 5 10.6 > 18
failure on pressure N > 200 > 24 > 130 > 340
Thermal time constantfor surface Sec (typ) 11.1 7.5 3.3 4.6for surfacetemperature
Sec (typ) 11.1 7.5 3.3 4.6
durability on bending cycle (min) 20 6 20 20
RoHS ◎ ◎ ◎ ◎RoHS ◎ ◎ ◎ ◎
Halogen free ◎ ◎ ◎ ◎
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