Battery Pack Temperature Sensor

Applications

Electric vehicles (EVs) and hybrid vehicles

Energy storage systems (ESS)

Consumer electronics (laptops, smartphones, power tools)

Battery management systems (BMS) to monitor and protect against overtemperature conditions

Features

High Accuracy & Stability

Fast Thermal Response

Small bead or surface-mount designs enable quick detection of temperature changes in battery cells.

Compact and Low-Profile

Fits inside battery modules without affecting space or thermal characteristics.

Low Self-Heating

Options

(Available on request)

Operating Temperature : 40°C to +125°C / up to +150°C for high temp variants

Sensor Type : Bead / Disc / Epoxy coated / Glass encapsulated / Probe type”

Encapsulation : Epoxy, resin, or glass bead; insulated for battery pack insertion

Leads : Flexible PTFE or silicone-insulated wires; SMD pads for PCB-mounted battery monitoring

Mounting Options : Embedded between cells, attached to cell surface, or integrated into BMS PCBs

Rated Temperatures and Dissipation Factor

Lower Temperature : -40°C

Upper Temperature : 140°C

Max Permissible Power at 25°C : 60 mW

Resistance Tolerance (ΔR/RN ) : ±0.5%, ±1%, ±2%, ±5%

Rated Temperature (TN) : 25°C

Dissipation factor in air(δth) : approx 1.5 mW/K

Thermal cooling time constant in air (τc) : ≈ 12s

Beta Tolerance (Δβ/βN) : ±1%, ±2%, ±3%,

Heat capacity (Cth) : ≈ 18 mJ/K

Electrical Data (Resistance and Beta Values)

Resistance At 25°C (Ω)		Beta Value (25/85) (K)
2000		3540
2057		3540
2800		3900
3000		3977
4700		3977
5000		3977
10000		3977

Resistance At 25°C (Ω)	Beta Value (25/85) (K)
20000	4000
30000	4050
47000	4100
49300	3960
50000	4100
100000	4400
170000	4250

Reliability Data

Test

Standard

Test Conditions

Change In R

Remarks

Storage in
dry heat

IEC 60068-2- 2

Storage at upper
category temp
T: 100°C t: 1000 h

<2%

No Visible Damage

Storage in
damp heat,
steady state

IEC
60068 – 2- 78

Temp of air:40 °C
Relative humidity
of air: 93 %
Duration: 56 days

<2%

No Visible Damage

Rapid
temperature
cycling

IEC
60068 – 2- 14

Lower test temp:– -30°C
Upper test temp: 150°C
Time to change from
lower to upper
temperature: <30 s
Number of cycles: 1000
Medium: air

<2%

No Visible Damage

Storage in
coldness

Storage at lower
category temp T: -30 °C
t: 1000 h

<2%

No Visible Damage

Vibration
resistance

IEC 60068-2-6

Frequency range: 5 to
500 Hz
Amplitude: 7.5 mm, 2 g
Duration: 3 x 8 h

<3%

No Visible Damage

Long-term
stability
(empirical value)

Temperature: 200 °C
t: 10000 h

<3%

No Visible Damage

Voltage proof Test

1250 V AC, 1 s

<3%

No flashover

Insulation test

The sensors are placed in a
vessel containing metallic
balls of 1 mm diameter (with
total immersed head). The
applied voltage is 100 V DC.

Above
1000 MΩ

STTS	103	R2	E01	K	K	441	3977
	103 – 10K	R2 – 2%	E01- Blue Epoxy Powder Coating	K- PTFE Multi strand copper wire	H- AWG 26	100MM	B(25/85)
		R- 1%	E03 – Epoxy Dip Coating	AA- FEP Multi strand copper wire	F- Awg 28	500MM
		R3 – 3%	E02- Black Epoxy Powder Coating		K – AWG 24	450MM
		R5 – 5%			M – AWG 22	440MM

Ordering Codes for NTC Thermistor Sensor For Battery Pack Temperature Sensing

STLT *** R# E%% @@ $$$ &&&&
*** = Resistance Value at 25°C (e.g. 102- 1000Ω, 201 – 200Ω, 103 – 10kΩ)
# = Resistance Tolerance (eg. R1 – ± 1%, R5 – ±5%)
%% = Encapsulation (eg. E01 – Epoxy Powder Coated (Blue))
@@ = Type of Lead (eg. GC, G – Single strand Nickel Wire(Silver Plated) & C – 30 AWG)
$$$ = Total Length in mm (eg: 250 – 25mm Length, 401 – 400 mm Length)
&&&& = Beta Value (eg:3977K, 3830K)

Battery Pack Temperature Sensor