Fuse[1].pdf

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Est. 1997/12/10
Rev.20 2002/11/27

SC Protector
Self Control Protector

Innovative way of safety control for Li-ion rechargeable battery
At any moment, SC Protector system monitors the voltage of Li-ion rechargeable battery and its heater
fuses the fuse at the same instant when the system detects the overcharge. Usual protection element
takes long time to work because it works due to temperature rise of battery cells.
The difference of SC Protector provides you high degree of freedom in the design of protection circuit.

1. Application
Typical application of protection for a Lithium ion rechargeable battery from overcharging is shown
in the figure below.
SC Protector
c

a

Battery

Charger

Voltage sensing IC

FET

d

b

When the voltage between a and b exceeds the pre-set limit value, the output of the voltage detector
IC becomes high and the FET is switched on. As a result, current flow through the heater of the
protector, the fuses melt, and the battery stops to be charged any longer.
Since the two fuses cut-off the voltage supplies from the charger and the battery, the SC Protector
stops to be heated immediately and thus, the safety control protection is provided against both excess
voltage and excessive heating.

Sony Chemicals Corporation
SIP Division

1-11-2, Osaki, Shinagawa-ku, Tokyo, 141-0032 Japan
TEL+81-3-5435-3943 FAX+81-3-5435-3072

-1-

2. Characteristics of SC Protector

Basic circuit with troubles

2.1. Necessity
2.1.1. Reliability of the protection circuit
All Li-ion rechargeable battery packs are
equipped with at least one protection
circuit (ex.IC+FET).
In this case, when an IC or FET breaks,
overcharge can't be controlled any more,
and the temperature rise of the battery
cell
can
invite
very
dangerous
thermo-runaway leading to smoking or
firing.
The trouble of the IC and FET actually
occurs.
Therefore, double protection is needed to
ensure the safety of Li-ion battery packs.

Overcharge = Danger

+
Battery
cell

IC for protection
Trouble?

T
NTC

Thermistor

FET

-
FET Trouble?

2.1.2. The weak points of conventional double protection elements.
Protection devices such as temperature fuses and bimetals work by conducting the temperature
rise in the battery to the inside of it via package or lead wire. Hence, they have a disadvantage
that the response speed is slow, and the response speed fluctuates depending on the installation
location of the device.
These elements obstruct a cost reduction since it is incompatible with the reflow soldering due
to their structures, and must depend on manual soldering.
By using SC Protector, the battery cells won't become dangerous condition even if IC or FET breaks.

SCP protects from overcharge
and over current = Safe

Protection against overcharging is
directly performed by the battery cell
voltage, ensuring high accuracy and Battery
cell
quick response, and the response speed
does not fluctuate depending on the
location and condition of installation.

SC Protector
+
Switching element

2)

Double protection circuit using SC Protector

Sensing element

2.2. Characteristics
1)
One device can protect against
both overcharging and overcurrent.

IC for protection
Trouble?

T

3)

At the same time of protection
against overcharging, since it is
-
constructed to send current to the
FET FET
heater via the fuse element, the fuse
element forcibly fused by the heating of the heater and, upon the cutoff of charging circuit,
the current to the heater automatically stops, and hence, SC Protector itself never
overheated.

4)

Abundant product lineup allows the selection of protector with optimal operating
voltage and operating current depending on the cell structure of battery pack, ensuring
high degree of freedom in the design of protection circuit.

5)

It is compatible with automatic mounting using general-purpose chip mounter, and at
the same time, compatible with the reflow soldering, contributing to the reduction of parts
mounting cost.

SC Protector has the strong points as shown above and it meets the safety requirement without
spoiling the strong point of miniature of the Li-ion battery.
-2-

3. Relations between the fusion state and the operation mode
"The operation mode" can be estimated by the fusion state of the fuse element.
3.1. Heater operation
In the case of overvoltage, "Both two sides of the middle electrode" are fused by the heater
operation. Because the fuses are heated until the charge to the heater is stopped.
Only one side may be cut when the protection circuit is designed so that charging to the
heater stops by cutting of one side of the middle electrode.
For the heater operation, it is characterized as "Fuses like flow into the middle electrode."

& lt; Features of the heater operation & gt;
! " Fuses like flow into the middle electrode
! " Both two side (or one side) is fused

3.2. Current operation
In the case of overcurrent operation, basically, "only one position of the fuse is cut" because
it is the same operation mode as the conventional electric current fuse. When the current
exceeds 50A, two positions are cut occasionally.
For the current operation, it is characterized as "The cutting position isn't fixed", "It cuts
like bursting".

& lt; Features of the current operation & gt;
! " Cutting position isn't fixed
! " It cuts like bursting
! " One position is cut basically (Over 50A,
two positions are cut occasionally)

-3-

4. Basis of selection
Price

(*1)

Soldering

Nominal
Current-carrying capacity
Rated current 25?
40?
60?

(*2)

Current-rush
withstand (*3)

Number of cells in series
2cells
3cells

1cell

4cells

Special edition (*6)
20V or more

5A

7.0A

6.0A

5.0A

30A-5ms

SFD-045A

SFD-125A

SFD-145B

SFD-165A

7A

8.0A

7.0A

6.5A

80A-5ms

SFD-047A

SFD-127A

SFD-147B

SFD-167A

8A

9.0A

8.5A

7.0A

80A-5ms

SFD-048A

SFD-128B

SFD-148B

-

12A

13.5A

12.0A

10.0A

100A-10ms(*4)

-

SFG-1212A SFG-1412A

-

Reflow

6A

7.0A

6.5A

5.5A

36A-5ms

Max
245?

8A

9.0A

8.5A

7.0A

Standard

Reflow

(Exclude
SFD-16x)

Max
260?

Low

SFE-046A SFE-086A SFE-126A

100A-0.5ms

SFE-246A

SFE-048A SFE-088A SFE-128A

50A-5ms

SFE-146A
SFE-148A

-

(*5)

Common model of thermal fuse with heater
Soldering iron
Spot reflow

10A

7A at 40?

-

(Fusing-off by 9A at 40?)

(*1) It is a relative expression between SFD/SFG and SFE.
(*2) It is the typical value that is calculated from 100?, the temperature that we confirmed the reliability with our company's standard PCB (0.6t Glass
Epoxy single-sided copper-clad laminates). It is influenced by thermal capacity of PCB and so we recommend checking it with your PCB.
25?, 40? and 60? are ambient temperature.
The temperature that we confirmed the reliability is not a critical condition. SCP fusing-off temperature is 200? or more.
Current-carrying capacity is measured in thermal equilibrium condition. Therefore, if Current-carrying time is short, Current-carrying
capacity will increase.
(*3) It is the test condition (5ms-On, 995ms-Off, 5000cycle) that we confirmed the reliability. But it is not necessarily a critical condition for SCP.
(*4) It is the test condition (10ms-On, 9990ms-Off, 1000cycle) that we confirmed the reliability. But it is not necessarily a critical condition for SCP.
(*5) We recommend using IC that can interrupt current by 0.5ms or less when SFE-xx8A is adopted in the module that has 80A or more rush current.
(*6) SFD-16xA is special edition that has high operating voltage. Therefore, we recommend using SFx-14xx for 4cells in series.
-4-

5. External view & Equivalent circuit

5.1. SFC series (Rated current 5A)
7

Fuse

Ceramic

4,6-nylon

1

3

2

1

3

4

2

Heater

4
unit mm

1.45max

4

5.2. SFD/SFE series (Rated current 5-8A)
5.4

Fuse

4,6-nylon Ceramic

1

3

3

3.2

1

Heater

4
unit mm

1.35max

4

1

5.3. SFG series (Rated current 12A)
7

4,6-nylon

Fuse

Ceramic

1
4

4

4

3
1.45max

Fuse

4,6-nylon Ceramic

1

Heater

1

2

3.2

3

unit mm

5.4. SFH series (Rated current 12A)
5.4

Heater

4
2

4

3
unit mm
1.35max

-5-

3

6. Terminal Size (Unit: mm. Not in scale.)

7.0?0.2
1.2

4 - R0.2

(2.9)

1.2

2.9

2.8

4

3

1.2

1.05

5.40

6.2. SFD/SFE series (Rated current 5-6A)

1.05

1.2

(0.65)

+0.3
-0.2

3-R0.2

3

1

1.2?0.1

0.40

6.3. SFD series (Rated current 7A)

1.2?0.1

2.20

5.40 +00..23
-

3.20

+0.3
-0.2

4

2.00

1.20

1.2?0.1

2.10

3

1.2?0.1

1

2.20

0.675

3-R0.2

0.40

3.20 -0.2

4

+0.3

1.2?0.1

2.10

2.00

1.2

1

1.20

0.65

2

4?0.2

6.1. SFC series (Rated current 5A)

1.2?0.1
Black insulation glass (15um or less)

-6-

5.40 +00..23
-

6.4. SFD/SFE series (Rated current 8A)

1.2?0.1

2.10

1.20

2-R0.35

3.20 -0.2

+0.3

4

1.20

1.825

1

3

1.475

3-R0.2

3.70
0.40

1.2?0.1

1.2?0.1

2.20

The unevenness of the circular
arc part is typical 15um.

6.5. SFG series (Rated current 12A)

7.0?0.2
1.2

(2.9)

3.6

4 - R0.2

4

(0.4)

1

0.75

1.4

0.75

-7-

1.2

0.75

1.4

(0.75)

4?0.2

3.0

3

2.0

0.9

(0.2)

2.9

7. Specification
7.1. General
SC Protector
Qualification

UL248-14 (File No. E167588),TUV (Certificate No. J9650637)

Rated voltage(*)

36VDC

Rated breaking capacity

50A

(*) is the maximum voltage can be cut off by fuse. It is not the operational voltage of the heater.

7.2. SFC series
for 1-2 cells in series
SFC-0405B

4.0~9.0V
4.1?0.4?

SC 5A SF

SC 5A SF

0405B

Marking

for 4 cells in series
SFC-1605A

SC 5A SF

Rated current
Size
Electrode
Fuse resistance 1-3 (Typical)
Operating electric power
Operating voltage
Heater resistance

for 3 cells in series
SFC-1205A
5A
7.0×4.0×1.45
Ag-Pd
15?3m?
3.5~22W
7.8~17.9V
16.0?1.5?
1205A

1605A

Reflowing temperature(MAX)

7.3. SFD series
SFD-04X for 1-2 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

260?

SFD-045A
5A

SFD-047A
7A
5.4×3.2×1.35
Au plated Ag-Pt
12?2m?
6.5?1.5m?
3.5~22W
4.0~9.0V
4.1?0.4?

5A SF
SC 10

Reflowing temperature(MAX)
SFD-12X for 3 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

8.5~19.3V
18.9?1.9?

7A SF
SC 10

SFD-048A
8A

5.5?1.0m?
4.0~22W
4.3~9.0V
8A SF
SC 10

260?
SFD-125A
5A

SFD-127A
SFD-128B
7A
8A
5.4×3.2×1.35
Au plated Ag-Pt
12?2m?
6.5?1.5m?
5.5?1.0m?
3.5~22W
4.0~22W
7.5~17.0V
6.5~13.6V
14.6?1.5?
9.4?0.9?
5A SF
SC 30

Reflowing temperature(MAX)

7A SF
SC 30
260?

-8-

8A SF
SC 31

SFD-14X for 4 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

SFD-145B
5A

SFD-147B
7A
5.4×3.2×1.35
Au plated Ag-Pt
12?2m?
6.5?1.5m?
3.5~22W
9.7~19.6V
22.0?4.4?

5A SF
SC 51

7A SF
SC 51

Reflowing temperature(MAX)

SFD-148B
8A

5.5?1.0m?
4.0~22W
10.3~19.6V
8A SF
SC 51

260?

SFD-16X for High Voltage
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance

SFD-165A
SFD-167A
7A
5A
5.4×3.2×1.35
Au plated Ag-Pt
12?2m?
6.5?1.5m?
3.5~22W
11.1~25.0V
31.6?3.2?

Marking

5A SF
SC 40

Reflowing temperature(MAX)

7.4. SFE series
SFE-04X for 1 cell in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

7A SF
SC 40
260?

SFE-046A
SFE-048A
6A
8A
5.4×3.2×1.35
Ag-Pt
9?2m?
5?1.5m?
~22W
3.5
3.5~20W
4.0~8.2V
4.0~7.0V
3.8?0.7?
3.5?1.0?
6A SF
SC 1B

8A SF
SC 1B

Reflowing temperature(MAX)

245?

SFE-08X for 2 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance

SFE-086A
SFE-088A
6A
8A
5.4×3.2×1.35
Ag-Pt
9?2m?
5?1.5m?
3.5~22W
3.5~20W
5.6~10.2V
5.6~9.8V
6.9?2.1?

Marking

6A SF
SC 2B

Reflowing temperature(MAX)

8A SF
SC 2B
245?

-9-

SFE-12X for 3 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

SFE-126A
SFE-128A
6A
8A
5.4×3.2×1.35
Ag-Pt
9?2m?
5?1.5m?
3.5~22W
3.5~20W
7.8~16.0V
8.0~14.1V
14.6?2.9?
14.2?4.2?
6A SF
SC 3B

Reflowing temperature(MAX)
SFE-14X for 4 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

245?
SFE-146A
SFE-148A
6A
8A
5.4×3.2×1.35
Ag-Pt
9?2m?
5?1.5m?
3.5~22W
3.5~20W
9.7~19.6V
11.2~19.6V
22.0?4.4?
27.6?8.3?
6A SF
SC 5B

Reflowing temperature(MAX)
SFE-24X for 5-6 cells in series
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

8A SF
SC 3B

8A SF
SC 5B
245?

SFE-246A
SFE-248A(*)
6A
8A
5.4×3.2×1.35
Ag-Pt
9?2m?
5?1.5m?
3.5~22W
3.5~18W
14.1~26.1V
15.8~26.3V
44.0?13.0?
55.0?16.5?
6A SF
SC 6B

Reflowing temperature(MAX)

8A SF
SC 6B
245?
(*) under development

- 10 -

7.5. SFG series
for 1 cell in series
SFG-0412A(*)
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

4.0~7.0V
2.0?0.6?

for 3 cells in series
SFG-1212A
12A
7.0×4.0×1.45
Ag-Pt
3?1m?
6~35W
7.8~13.8V
7.8?2.3?

for 4 cells in series
SFG-1412A

10.5~18.5V
14.0?4.2?

12A G1

12A G3

12A G4

SC SF

SC SF

SC SF

Reflowing temperature(MAX)

260?
(*) under development

7.6. SFH series
for 1 cell in series
SFH-0412A(*)
Rated current
Size
Electrode
Fuse resistance (Typical)
Operating electric power
Operating voltage
Heater resistance
Marking

4.0~7.1V
2.4?0.7?

for 3 cells in series
SFH-1212A(*)
12A
5.4×3.2×1.35
Ag-Pt
3?1m?
5~30W
7.7~13.8V
9.1?2.7?

for 4 cells in series
SFH-1412A(*)

10.4~18.5V
16.4?4.9?

12A H1

12A H3

12A H4

SC SF

SC SF

SC SF

Reflowing temperature(MAX)

260?
(*) under development

- 11 -

8. Temperature profile of reflow soldering
The temperature shown below is the temperature of the electrode portion of SC Protector.

8.1. Temperature profile of 245? peak
Applicable to: SFC, SFD, SFE, SFG, SFH Type
Peak 245?

Temperature[?]

Over 230?: 30s

200
Pre-heat

100
Over 135?: 120s

0

0

30

60

90

120

150

180

210

Time [s]

8.2. Temperature profile of 260? peak
Applicable to: SFC, SFD, SFE, SFG, SFH Type (Not applicable to SFE Type)
Peak 260?

180?-190?: 60s

Temperature[?]

Over 230?: 30s

200
Pre-heat

100

0

0

30

60

90

120
Time [s]

- 12 -

150

180

210

9. Voltage operation
9.1. Operating electric power and Operating voltage
1) Operating electric power range: Electricity Power applied to heater
2) Operating voltage range: Values are calculated from operating electric power range and heater
resistance. Protector operation is normal under voltage applied to heaters in these
ranges. Operating voltage range is adjustable by regulating heater resistance.
(Operating voltage[V]=?Operating electric power [W]×Heater resistance[?] )

9.2. Voltage operation test method
1) Connect SC Protector with a constant power
supply.
2) Apply a current to the heater.
1

3

3) Measure the time the fuses take to melt.
Power supply

4

9.3. Operation time by the heater (Electricity vs. clearing time at 25?)
100

SFC-5A
SFD-5A
SFD-7A,8A

10
Clearing Time(s)

SFE-6A
SFE-8A
SFG-12A
1

0.1
0

5

10

15

20
Electric Power(W)

- 13 -

25

30

35

40

9.4. Operation time by the heater (Voltage vs. clearing time at 25?)
SFC-0405B
SFC-1205A
SFC-1605A
SFD-045A
SFD-047A,048A
SFD-125A
SFD-127A
SFD-128B
SFD-145B
SFD-147B,148B
SFE-126A
SFE-128A
SFE-146A
SFE-148A
SFG-1212A
SFG-1412A

100

Clearing Time(s)

10

for 4cells
in series
for 3cells
in series
for 1-2cells
in series

1

0.1

0

5

10

Voltage(V)

15

20

25

9.5. Operation time by the heater (Ambient temperature vs. clearing time)

Clearing Time(s)

100
SFC-5A (3.5W)
SFD-5A (3.5W)
SFD-7A,8A (3.5W)
SFE-6A (3.5W)
SFE-8A (3.5W)
SFG-12A (6W)

10

1
-40

-20

0

20

40

Ambient temperature

- 14 -

60

80

100

10. Current interrupting time (at25?)
100
SFC-5A
SFD-5A

10

SFD-7A,8A
SFE-6A

Clearing Time(s)

1

SFE-8A
SFG-12A

0.1

0.01

0.001

0.0001
0

20

40

60

80

100

120

140

160

Current(A)

10.1. Current interrupting time (Ambient temperature vs. Clearing time by Rated Current * 2)

Clearing Time(S)

100

SFC-5A
SFD-5A
SFD-7A,8A
SFE-6A
SFE-8A
SFG-12A

10

1
-40

-20

0

20

40

Ambient Temperature(?)

- 15 -

60

80

100

11. Others

11.1. Catalog data is the typical value.
1)
Catalog data is not a guaranteed value.
2)
Catalog data is measured with our company's standard PCB (0.6t Glass Epoxy
single-sided copper-clad laminates). The characteristics are influenced by thermal capacity
of PCB. Generally, when thermal capacity of PCB increases, Current-carrying capacity will
increase and Clearing-time will be long.

11.2. Please select the product on the basis of [Current-carrying capacity].
1)
Nominal rated current is provided on the basis of UL standard (The maximum
temperature rise on body or contact that is passed the current shall not exceed 70°C) and so
it is not Current-carrying capacity. Therefore, please select a product on the basis of
Current-carrying capacity instead of Nominal rated current.
2)
Current-carrying capacity is influenced by thermal capacity of PCB. Therefore we
recommend checking it on your PCB.
3)
We accept the test (Current-carrying capacity and Clearing-characteristics and so on) with
your PCB. Please request to us unreservedly.

11.3. Current-carrying capacity
1)
Current-carrying capacity is the current-carrying value that SCP reaches temperature
that we confirmed the reliability in our company.
2)
The temperature that we confirmed the reliability is 100 ? . But it is not a critical
condition for SCP. For example, if SCP temperature exceeds it, SCP is not immediately
fusing-off like a common thermal fuse. SCP fusing-off temperature is 200? or more and so
it has much more capability for the temperature rise.
3)
Current-carrying capacity is measured in thermal equilibrium condition so that if
Current-carrying time is short, Current-carrying capacity will increase.

11.4. Precautions regarding handling
1)
Make sure that the terminals of this product are connected on the lands of the circuit
board, and that the resistance between terminal1-4 and 3-4 are rated heater resistance.
2)
Ultrasonic cleansing or immersion cleansing must not be done for SCP. When cleansing is
done, flux in element flows, and the specification will not be satisfied. These products after
cleansing will be not guaranteed.

Sony Chemicals Corporation
SIP Division

1-11-2, Osaki, Shinagawa-ku, Tokyo, 141-0032 Japan
TEL+81-3-5435-3943 FAX+81-3-5435-3072

- 16 -


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