Sheet1COMPARISON OF BMS ICs FOR LARGE LI-ION BATTERY PACKSDavide Andrea / LiIonBMS.com / Updated Nov 2014xls spreadsheetAMSAnalog DevicesAtmelCellWiseElithionFreeScaleImagisInternational RectifiersIntersilLinear TechnologyMaximNational Semi.NECO2MicroRenesasTexas InstrumentsToshibaPart NumberAS8506AD7280ATA6870ATA6871CW1165EL01 / EL02MC33771SMC33771T(Apollo)?ISL9208ISL9216 + ISL9217ISL94200 / ISL94201LTC6801LTC6802-1LTC6802-2LTC6803-1LTC6803-2LTC6803-3LTC6803-4LTC6804-1LTC6804-2DS2726MAX11068MAX11080 / MAX11081MAX17823/ MAX17830?D15110OZ890AA#####AAR2A20027 / R2A20028R2A270100HFPbq78PL114 pus bq76PL102bq77PL900bq76PL536EMB1432QEMB1433QTB9141FGRecom-mend24~48 VNo word after many yearsAnalog fault protector Analog fault protectorNo word after many yearsAnalog fault protectorHigh voltage ReasonNo longer supportedNot yet releasedOnly to OEMUnavailableUnavailableSmall batteriesSmall batteriesSmall batteriesSmall batteriesSmall batteriesSmall batteriesSmall batteriesUnavailableSmall batteriesNot yet availableUnavailableUnavailableSmall batteriesSmall batteriesUnavailableGeneralDescription7-cell analog front endCascadable to any number of cells6-cell analog front endCascadable to 300 cells6-cell analog front endCascadable to 96 cells6-cell fault detectorCascadable to 96 cells16 cell analog front end1-cell BMS ICCascadable to ~ 256 cells14-cell analog front endCascadable to unlimited cells14-cell analog front endAddressable13 cell protectorIn design7-cell analog front end without A/D12-cell analog front end chips setCascadable to 12 cells7-cell analog front end without A/D12-cell fault detector Cascadable to 192 cells12-cell analog front endCascadable to 192 cells12-cell analog front endAddressable12-cell analog front endCascadable to 192 cells12-cell analog front endAddressable12-cell analog front endCascadable to 192 cells12-cell analog front endAddressable12-cell analog front endCascadable to unlimited cells12-cell analog front endAddressable10 cell standard Li-Ion / LiPo BMS12-cell analog front endCascadable to 372 cells12-cell fault monitorCascadable to 372 cells12-cell analog front endCascadable to 96 cellsBeta test4 cell analog front end13-cell full protectorBeta test12-cell analog front end12-cell full protector BMS chip set and analog front end10-cell analog front end and full protector BMS3-6 cell analog front end plus fault detectorCascadable to 192 cells14 cell analog front end (no A/D)14 cell fault protector16-cell analog front endSingle string voltageUnlimited1 KV330 V330 V80 V1 kV100 V24 V42 V24 V670 V670 VAny670 VAny670 VAnyAny350 V670 V670 V330 VAny728 V42 V35 V670 VAnyAnyBMS technologyDigitalDigitalDigitalAnalogDigitalDigitalDigitalDigitalDigitalDigitalDigitalAnalogDigitalDigitalDigitalAnalogDigitalDigitalDigitalDigital + analog fault detectorDigitalDigitalDigital + analog fault detectorAnalogAnalogDigitalBMS topologyWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredDistributedWiredMaster/slaveWiredcentralizedWiredStandaloneWiredMaster/slaveWiredStandaloneWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredStandaloneWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveCentralizedWiredMaster/slaveWiredMaster/slaveWiredStand-aloneWiredStand-aloneWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveWiredMaster/slaveDiagnostics (ISO26262)YesYesDevelopment effort requiredMediumMediumMediumLowMediumMinimalMediumMediumHighHighHighLowMediumLowMediumLowMediumMediumMediumMediumMediumMediumLowLowMediumFull BMS functionality-xxxxHigh level, versatileIncluded in master IC-High level included in chip--------Complete BMS---High level included in chip-High level, sophisticatedIncluded in chipNot usable with large packsHigh level, sophisticatedIncluded in chipNot usable with large packs----CellsSeries cells / # of ICs3~7 cells / IC4~6 cells / IC3~6 cells / IC3~6 cells / IC16 cells / IC1 cell / ICup to 14 cells / IC13 cell / IC7 cells / IC12 cells / 2 ICs7 cells / IC4~12 cells / IC4~12 cells / IC10 cells / IC4~12 cells / IC4~12 cells / IC?~12 cells / IC4 / IC5~13 cells / IC6~12 cells / IC12 cells / 5 ICs10 cells / IC3~6 cells / IC14 cell / IC14 cell / IC?~16 cells / ICSeries cells / bank (No isolators)14300969616~16256 with isolators14267127192192121921219212Unlimited121037237296Any208121019214> 200Temperature sensors2 / 7 cells1 / cell1 / 3 cells1 / 6 cells1/8 cells1 / cell1 / 2 cells1 / cell1 / 7 cells1 / 12 cells1 / 7 cells1 / 6 cells1 / 6 cells01 / 6 cells02001 / cell1 / 10 cells1 / 3 cells00BalancingInternal resistorxxxxxxx----170 mA, but IC overheats?-----Yes (barely OK)--9 ma---Internal FETMUX to 2 pinsxxx~300 mA, versions -A & -P only-200 mA--~10 mA300 mA250 mA-150 mA10 mA100 mA-< 9 mA---YesExternal FET, res.-Dedicated pinsDedicated pinsxDedicated pinsDedicated pinsYesDedicated pinsDedicated pinsDedicated pins-Dedicated pinsShared pins (1)-YesYesDedicated pinsDedicated pins, depend. on model-Shared pins (1)Dedicated pins--Non-dissipative (active)PossibleWithin 7 cellsxxxxxx-----------Yes10mA ~ 1A----Current drainShutdownn.a.n.a.n.a.n.a.n.a.n.a.4 An.a.n.a.n.a.?-n.a.n.a.n.a.1 AStandby4 A4 A10 A50 A20 A2 A10 A30 A50 A1 A2 A?-100 A0.1 A12 A10 AOperating1 ~ 30 mA1 ~ 30 mA15 mA5 mA200 A1.5 mA1 mA0.7 mA1.5 mA2 mA0.08 mA?-0.25 mA0.6 mA10 mA150 AReadingsVoltage accuracy @ 3.6 V, 25 C [mV]71073001520.3n.a.58n.a.3380.3151002-2.5 or 4, depend. on model531-2Cell voltage, min1.8001.912---0.7001.6-2.300.5-Cell voltage, max4.5554.44.55---4.5554.8-4.564.6-Readings time / cell10 ms~25 s8 ms up to 250 kHzn.a.11 ms~10 ms40 us0.3 msn.a.-n.a.n.a.1.2 ms0.11 ms35 usn.a.-250 s250 s~100 sn.a.-Current sense----Hi curr HELow curr. shuntLow curr. shunt----------------Low curr. shunt--Low curr. shuntLow curr. shunt---CalcSOC (fuel cell)----Coulomb cnt/Voltage xltCoulomb count, version -PCoulomb cnt/Voltage xlt-----------------Voltage xltCoulomb cnt/Voltage xlt----Communi-cationsWires between cascaded ICs6current sources7current sources8current sources4current sourcesn.a.1current source2n.a.yesn.a.n.a.n.a.5current sources4current sourcesn.a.4current sourcesn.a.4current sourcesn.a.2ISOSPIn.a.n.a.4capacitive2213optically isolated6 current sources, SPIn.a.n.a.8current sourcesn.a22Wires to master controller104 to 7824n.a.657555n.a.42224n.a58n.a.3To master controllerSPISPISPIdig levelI2CproprietaryMC33664SPISPI or I2CI2CI2CI2Csquare waveSPIn.a.I2C (SMB)square waven.an.aI2C (SMB)SPIn.a.heart beatTo hostn.a.n.a.n.a.n.a.RS232, CANn.a.n.a.n.a.n.a.n.a.n.a.n.a.n.a.n.a.n.a.n.a.I2C (SMB)I2C (SMB)I2C (SMB)n.a.n.a.n.a.Cost & avail.ICs only / per cell [$]1.310.840.353???0.640.941.260.440.970.970.970.970.970.971.051.050.740.730.782.37Unknown0.580.331.36??Parts / per cell [$]~0.5~0.5~1.5~0.5~1.5???~1.5~1.5~1.5~0.5~1.5~1.5~1.5~1.5~0.5Unknown~2~2~2~1.5AvailabilityExcellentExcellentPoorPoorGoodNot availableNot available?ExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNonePoorNoneNoneExcellentExcellentExcellentPoorPoorNoneNotesSingle, multiplexed port for balancing only 1 of 7 cells at a time, for a max of ~ 50 mA-Fixed voltage thresholds.Other values by special orderIncludes shunt current sensor inputEL01 for cell-board / EL02 for main controllerKnock-off of LT's LTC6804Except higher voltageand lower accuracy---Uses direct, daisy-chain data bus connection between ICsEach IC communicates with master, through isolatorsUses direct, daisy-chain data bus connection between ICsEach IC communicates with master, through isolatorsUses direct, daisy-chain data bus connection between ICsEach IC communicates with master, through isolatorsIsolated SPI: safe and noise-free cascadingEach IC communicates with master, through isolatorSee note (2), below.No info available to dateUsed in the Nissan Leaf battery pack---345.6Notes:1Shared pins limit the ability to balance: measurement cannot be taken while balancing. and adjacent cells cannot be balanced simultaneously.2While in theory the Maxim chip can be daisy-chained to handle large packs, the way they want you to do so will probably not work in reality: they want you to use capacitive coupled voltage levels between chips, which will work on a bench, but our experience says that it simply doesn't work in the noisy automotive environment. That doesn't mean that the Maxim chip cannot be used in large packs. It can. But you must add hardware to it to make it work. Here are 3 suggestions:a) Add current sources on each communication line, as described by Linear Technology in their LTC6802-2 spec sheet.b) Fit each chip with a set of digital isolators to the next chip up the chain (requires a DC-DC converter for each chip).c) Fit each chip with a set of digital isolators (requires a DC-DC converter for each chip) to a multiplexer to select which chip communicates with the controller at a given time.3IC prices are approximate, in 100's, and assuming max number of cells that IC supportsNot recommended for large battery packs (due to specs or unavailability)Recommended for large battery packsn.a.Not applicableDisclosure: Davide Andrea is a principal of Elithion

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