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- 1 - rev.39 2006/4/1 sc protector self control protector innovative way of safety contro l for li-ion rechargeable battery at any moment, sc protector system monitors the volt age 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. 4$1spufdups #buufsz 7pmubhftfotjoh*$ 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 batte ry 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 electronic devices business group 1-11-2, osaki, shinagawa-ku, tokyo, 141-0032 japan tel+81-3-5435-3943 fax+81-3-5435-3072 iuuqxxxtddtpozdpkqiunm@fqspevdutefubjmqse@giunm a b charger c d fet
- 2 - 2. characteristics of sc protector 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 lead ing 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. 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 batter y cells won?t become dangerous cond ition even if ic or fet breaks. 2.2. characteristics 1) one device can protect against both overcharging and overcurrent. 2) protection against overcharging is directly performed by the battery cell voltage , ensuring high accuracy and quick response, and the response speed does not fluctuate depending on the location and condition of installation. 3) at the same time of protection against overcharging, since it is constructed to send current to the heater via the fuse element, the fuse element forcibly fused by the heating of the he ater and, upon the cutoff of charging circuit, the current to the heater automatically stop s, and hence, sc protector itself never overheated. 4) 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 ab ove and it meets the safety requirement without spoiling the strong point of miniature of the li-ion battery. ic for protection fet trouble? ntc thermistor t trouble? fet battery cell overcharge = danger scp protects from overcharge and over current = safe fet t fet sc protector sensing element switching element double protection circuit using sc protector battery cell ic for protection trouble? basic circuit with troubles
- 3 - 3. specification 3.1. general sc protector environmental compliance comp liance with rohs and ss-00259 qualification ul248-14 (file no. e167588) | tuv (certificate no. j9650637) rated voltage (*) 35vdc rated breaking capacity 50a re-flow temp. max 260deg.c (*) is the maximum voltage can be cut off by fuse. it is not the operational voltage of the heater. 3.2. sfh-12a series for 1 cell in series for 2-3 cells in series for 4 cells in series sfh-0412a sfh-1212a sfh-1412a rated current 12a size 5.4x3.2x1.35mm electrode ag-pt fuse resistance (typical) 2 - 4 mohms operating electric po wer 6.5 - 35w 6 - 35w operating voltage 4.0 - 7.0v 7.4 - 13.8v 10.5 - 19.6v heater resistance 1.4 - 2.4ohm s 5.5 - 9.1ohms 11.0 - 18.4ohms marking 3.3. sfh-15a series for 1 cell in series for 2-3 cells in series for 4 cells in series SFH-0415A sfh-1215a sfh-1415a rated current 15a size 5.4x3.2x1.35mm electrode au plated ag-pt fuse resistance (typical) 1 - 3 mohms operating electric powe r 7.0 - 30w 6.5 - 35w operating voltage 4.0 - 6.4v 7.4 - 13.8v 10.5 - 19.6v heater resistance 1.4 - 2.2ohm s 5.5 - 8.3ohms 11.0 - 17.0ohms marking </05*$&> 4'( 4'% boe4'$tfsjftbsfhpj ohupcfejtdpoujovfeqspevdut 5iftdifevmfbgufsjutibmmcfepofjtbtcfmpx .bsdi %jtdpoujovfqspevdujpo8fxjmmtupqsfdfjwjo hbvtvbmpsefs "qsjm 4vqqpsuqfsjpetu bsu8fdpvmepomzsfdfjwf ,qdtpsnpsfbupofujnf %fmjwfszujnfxpvmecfbcpvunpoui 1sjdfnjhiucfdpnfijhifsuibocfgpsf .bsdi 4vqqpsuqfsjpefo er8fxjmmtupqqspevdjohdp nqmfufmz 12a h1 sc sf 12a h4 sc sf 12a h3 sc sf 15a h1 sc sf 15a h4 sc sf 15a h3 sc sf
- 4 - 4. basis of selection to change to sfh *if you are using scp that is not sfh, please change to sfh according to the following table as soon as possible. /vncfspgdfmmtjotfsjft $vssfoudbsszjoh dbqbdjuz
dfmm dfmm dfmm dfmm /pnjobm 3bufe dvssfou $ $ $ $vssfou 3vti 8juituboe 4pmefsjoh $pnqmjbodf xjui3p)4 4')" 4')" 4')" " " " " "nt t 4'" 4')" 4')" " " " " "nt t 3fgmpx .by efh$ 4'(" 4'(" 4'(" 4'%" 4'%" 4'%" 4'%" 4'%" 4'%# $pnnponpefmpguifsnbmgvtfxjuiifbufs " "buefh$ 'vtjohpggcz"buefh$
4pmefsjohjspo 4qpusfgmpx (*1) it is the typical value that is calculated from 100 deg.c, the temperature that we confir med the reliability with our com pany?s standard pcb (0.6t glass epoxy single-sided copper-clad laminates). it is influenced by thermal capacity of pcb and so we recomme nd checking it with your pcb. ~ 25deg.c, 40reg.c and 60deg.c are ambient temperature. ~ the temperature that we confirmed the reliability is not a critical condition. scp fusing-off temperature is 200deg.c or more. ~ current-carrying capacity is measured in thermal equilibrium co ndition. therefore, if current-carrying time is short, current-c arrying capacity will increase. (*2) it is the test condition (10ms-on , 9990ms-off, 500cycle) that we confirmed the reliability. but it is not necessarily a c ritical condition for scp. (*3) 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 - 5. voltage operation 5.1. operating electric power and operating voltage 1) operating electric power range: el ectricity 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 adjust able by regulating heater resistance. (operating voltage[v] 1 y operating electric power [w] heater resistance[
] ) 5.2. voltage operation test method 1) connect sc protector with a constant power supply. 2) apply a current to the heater. 3) measure the time the fuses take to melt. 5.3. operation time by the heater (electricity vs. clearing time at 25 deg.c) 0.1 1 10 100 0 5 10 15 20 25 30 35 40 electric power(w) clearing time(s) sfh-12a sfh-15a 1pxfstvqqmz 1 4 3
- 6 - 5.4. operation time by the heater (voltage vs. clearing time at 25 deg.c) 5.5. operation time by the heater (ambient temperature vs. clearing time) 0 5 10 15 20 25 voltage(v) clearing time(s) sfh-0412a sfh-1212a sfh-1412a SFH-0415A sfh-1215a sfh-1415a for 4cells in series for 3cells in series for 1-2cells in series 1 10 100 -40 -20 0 20 40 60 80 100 ambient temperature clearing time(s) sfh-12a (6w) sfh-15a(6.5w)
- 7 - 6. current interrupting time (at25 deg.c) 6.1. current interrupting time (ambient temperature vs. clearing time by rated current * 2) 0.001 0.01 0.1 1 10 100 0 20 40 60 80 100 120 140 160 current(a) clearing time(s) sfh-12a sfh-15a 1 10 100 -40 -20 0 20 40 60 80 100 ambient temperature( ? ) clearing time(s) sfh-12a sfh-15a
- 8 - 7. relations between the fusion state and the operation mode ?the operation mode? can be estimated by the fusion state of the fuse element. 7.1. heater operation in the case of over-voltage , ?both two sides of the middle electrode? are fused by the heater operation. because the fuses are heated unt il the charge to the heater is stopped. only one side may be cut when the protection circu it 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.? * fuses like flow into the middle electrode * both two side (or one side) is fused 7.2. current operation in the case of over-current operation, basically, ?only one position of the fuse is cut? because it is the same operation mode as the conven tional 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?. * cutting position isn?t fixed * it cuts like bursting * one position is cut basically (over 50a, two positions are cut occasionally)
- 9 - 8. external view & equivalent circuit *sfh series (rated current 12-15a) 9. terminal size (unit: mm. not in scale.) *sfh series (rated current 12-15a) 10. temperature profile of reflow soldering the temperature shown below is the temperature of the electrode portion of sc protector. time [s] 180 deg.c-190 deg.c: 60s 0 30 60 90 120 150 180 210 200 100 0 over 230 deg.c: 30s peak 260 deg.c pre-heat temperature [deg.c] heater fuse 3.2 5.4 1.35max 4,6-nylon ceramic unit: mm ? ? ? ? ? ? ( ( ? ? 2.0 1.4 (2.0) 0.6 1.05 2.2 3.0 - 3.5 0.95 1.4 0.95 0.4 0.4 ( 0.65 ) 0.65 4 - r0.2 ( 0.2 ) ( 0.45 ) 2.75 5.2 - 5.7
- 10 - 11. others 11.1. please confirm the latest product information before a design. you can confirm the latest information on sc protector in the following homepage. iuuqxxxtddtpozdpkqiunm@fqspevdutefubjmqse@giunm 11.2. sc-protector complies with environmental regulation. 1) sc-protector complies with rohs. 2) sc-protector complies with ss-00259, so ny environmental management standard. 11.3. 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 chara cteristics 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. 11.4. please select the product on the basis of [current-carrying capacity] and [heater operation characteristics]. 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 deg.c) and so it is not current-carrying capacity. ther efore, please select a product on the basis of current-carrying capacity instead of nominal rated current. 2) [current-carrying capacity] and [heater oper ation characteristics] are influenced by thermal capacity of pcb and so on. therefor e 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. 11.5. current-carrying capacity 1) current-carrying capacity is the current-c arrying value that scp reaches temperature that we confirmed the reliability in our company. 2) the temperature that we confirmed the reliab ility is 100 deg.c. but it is not a critical condition for scp. for example, if scp temp erature exceeds it, scp is not immediately fusing-off like a common thermal fuse. scp fusi ng-off temperature is 200 deg.c 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, curr ent-carrying capacity will increase. 11.6. precautions regarding handling 1) make sure that the terminals of this prod uct are connected on the lands of the circuit board, and that the resistance between termi nal1-4 and 3-4 are rated heater resistance. 2) ultrasonic cleansing or immersion cleansing mu st not be done for scp. when cleansing is done, flux in element flows, and the specificat ion will not be satisfied. these products after cleansing will be not guaranteed. sony chemicals corporation electronic devices business group 1-11-2, osaki, shinagawa-ku, tokyo, 141-0032 japan tel+81-3-5435-3943 fax+81-3-5435-3072 iuuqxxxtddtpozdpkqiunm@fqspevdutefubjmqse@giunm

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