PTC for High Voltage Battery Applications
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[单体]电池cell原电池primary cell蓄电池secondary cell电池battery燃料电池fuel cell锂电池lithium cell熔融盐电池molten salt cell碱性电池alkaline cell固体电解质电池solid electrolyte cell非水电解质电池non aqueous cell指示电池pilot cellOEM电池OEM battery替换电池replacement battery储备电池reserve cell应急电池emergency battery缓冲电池buffer battery; back-up battery 电压标准电池standard voltage cell韦斯顿电压标准电池 Weston standard voltage cell激活activation未激活的inactivated全密封电池hermetically /sealed cell极板plate涂膏式极板pasted plate极群plate group负极板negative plate正极板positive plate管式极板tubular plate极群组plate pack极板对plate pair隔离物spacer隔板(plate)separator阀valve电池外壳cell can电池槽cell case电池盖cell lid电池封口剂lid sealing compound整体电池monobloc battery整体槽monobloc container边界绝缘体edge insulator外套jacket[单体电池]电极(cell)electrode端子terminal端子保护套terminal protector;terminal cover负极端子negative terminal正极端子positive terminal电极的活性表面active surface of an electrode阳极anode阴极cathode电解质electrolyte电解质爬渗electrolyte creep电解质保持能力electrolyte containment泄漏leakage活性物质active material活性物质混合物active material mix电池组合箱battery tray输出电缆output cable连接件connector矩形(的)prismatic圆柱形电池cylindrical cell扣式电池button cell; coin cell 电化学反应electrochemical reaction 电极极化electrode polarization 反极polarity reversal cell reversal 结晶极化crystallization polarization活化极化activation polarization阳极极化anodic polarization阴极极化cathodic polarization浓差极化concentration polarization; mass transfer polarization 欧姆极化ohmic polarization反应极化reaction polarization阳极反应anodic reaction阴极反应cathodic reaction副反应side reaction; secondary reaction;容量(电池的)capacity(for cells or batteries)额定容量rated capacity剩余容量residual capacity体积(比)容量volumetric capacity温度系数temperature coefficient(of the capacity)质量(比)容量gravimetric capacity面积(比)容量areic capacity电池能量battery energy(电池)体积(比)能量volumic energy(related to battery)(电池)放电discharge(of a battery)放电电流discharge current放电率discharge rate短路电流(电池的)short-circuit current(related to cells or batteries) 自放电self discharge放电电压(电池的)discharge voltage(related to cells or batteries)闭路电压closed circuit voltage负载电压(拒用)on load voltage (deprecated)初始放电电压initial discharge voltage初始闭路电压initial closed circuit voltage初始负载电压(拒用)initial on load voltage(deprecated)终止电压end-of-discharge voltage; final voltage; cut-off voltage; end-point voltage标称电压nominal voltage开路电压(电池的)open-circuit voltage(related to cells or batteries)开路电压温度系数temperature coefficient of the open-circuit voltage 比特性specific characteristic荷电保持能力charge retention容量保持能力capacity retention表观内阻internal apparent resistance剩余活性物质residual active mass使用质量service mass并联parallel connection并串联parallel series connection串联series connection串并联series parallel connection标称值nominal value电池耐久性battery endurance贮存试验storage test使用寿命service life贮存寿命storage life; shelf life连续工作试验continuous service test金属-空气电池air metal battery碱性锌-空气电池alkaline zinc air battery碱性锌-二氧化锰电池alkaline zinc manganese dioxide battery锌-氧化银电池zinc silver oxide battery中性锌-空气电池neutral electrolyte zinc air battery氯化锌电池zinc chloride battery锌-碳电池zinc carbon battery诸如勒克朗谢电池或氯化锌电池之类的原电池。
Eaton PolyTron PTC resettable fuses provide fast-acting circuit protectionProduct descriptionEaton Bussmann® series PolyTron PTC family of resettable fuses are designedto protect sensitive components from overcurrent and overtemperature conditions that can occur due to power surges, electrical transients, high ambient temperatures, and more.Eaton’s resettable PTC fuses are based on a special positive coefficient material whose internal resistance increases exponentially in response to overcurrent conditions and higher temperatures. The high resistance offered by the fuseduring a trip prevents current from flowingthrough the circuit until the fault current/overtemperature source is removed andfalls below the design current/temperaturelimit. Once the fault current is removed, orthe ambient temperature cools, the fusere-enters its conducting state, allowingcurrent to flow through the circuit again.Eaton’s resettable PTC fuses ensureconstant uptime in applications where usingone-time fuses would be impractical orexpensive, e.g., in battery-powered devices,industrial controllers, medical devices, andI/O ports of consumer electronics.For more information, view Eaton’s PTCApplication note.Features and benefits:• Fast trip times with resettable operation• Overcurrent and overtemperatureprotection• Wide range of current (I hold) and voltageoffering• Low initial resistance to minimize powerdissipation• Wide range of current (I hold) and voltage(Vmax) offerings•RoHS compliant, lead-free, halogen-free Eaton Bussmann® series PTC resettable fusesEaton is a registered trademark.All other trademarks are property of their respective owners.EatonElectronics Division 1000 Eaton Boulevard Cleveland, OH 44122United States/electronics© 2021 EatonAll Rights Reserved Printed in USAPublication No. 11051 BU-MC21081June 2021PolyTron PTC resettable fusesSurface mount (SMD)RadialPTSLR 0603PTSLR 0805PTSLR 1206PTSLR 1210PTSLR 1812PTS 0603PTS 0805PTS 1206PTS 1812PTR 016V PTR 030V PTR 060VChip size (imperial)06030805 1206121018120603080512061812---Hold current (Ihold)0.5 A - 3 A 0.75 A - 4.5 A 0.75 A - 7 A 1.75 A - 7.5 A 1.9 A - 5 A 0.04 A - 0.35 A 0.1 A - 0.75 A 0.05 A - 2 A 0.10 A - 3 A 0.9 A - 15 A 0.9 A - 9 A 0.1 A - 3.75 A Max voltage (Vmax) 6 - 8 Vdc 6 - 8 Vdc 6 Vdc 6 Vdc 6 Vdc 6 - 15 Vdc 6 - 24 Vdc 6 - 60 Vdc 6 - 60 Vdc 16 Vdc 30 Vdc 60 Vdc Max fault current (Imax)25 A - 50 A 50 A 50 A 50 A 50 A 1 A - 8 A 100 A 100 A 10 A - 100 A 40 A - 100 A 40 A - 100 A 40 A Agency approvalsUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVUL & TUVIndustry ApplicationComputerCPU & hard disk drives x x x x x x x USB 2.0, 3.0, 3.1xxxxxxxx x x IEEE1284 parallel data buses xxxIEEE 802.3xIEEE 1394xxI/O ports (HDMI, DVI VGA)xxx x x xx x x x PC cards xxxxx x x SCSIxx xUSB flash memory modules xxxx x xx x x LCD monitors xx xxxxConsumer ElectronicsLoudspeakers x x x x x x xSmart card readers x x x x x x xxxMobile devicesx x x x x x Portable/Wearable devices x x x x x x xBattery protection x x x x x x Portable electronic input ports xxxxxxx x x Set top boxes x x x xx x Industrial ElectronicsLinear AC/DC adapt-ersxxxx x Electromagnetic loads, motorxx Solenoid protection x x x Displays x xx x Security systems x x x Industrial controlsx x x Medical ElectronicsMedical equipment xxxVoltage / current input terminalsxxFollow us on social media to get thelatest product and support information.。
123sn1232 1232fasSYMBOL PARAMETER CONDITIONSMINTYP MAX UNITSV CC Supply Voltage● 4.555.5V V IH ST and PB RST Input High Level ●2V CC +0.3V V ILST and PB RST Input Low Level●–0.30.8VDC ELECTRICAL CHARACTERISTICSSYMBOL PARAMETER CONDITIONS MINTYP MAX UNITS I IL Input Leakage (Note 3)●–11µA I OH Output Current at 2.4V (Note 5)●–1–13mA I OL Output Current at 0.4V (Note 5)●26mAI CC Supply Current (Note 4)●0.52mA V CCTP V CC Trip Point TOL = GND ● 4.5 4.62 4.74 V V CCTP V CC Trip PointTOL = V CC●4.254.37 4.49 V V HYS V CC Trip Point Hysteresis 40mV V RSTRST Output Voltage at V CC = 1VI SINK = 10µA4200mVThe ● denotes the specifications which applyover the full operating temperature. V CC = full operating range.The ● denotes the specifications which apply over the full operatingtemperature. V CC = full operating range.SYMBOL PARAMETER CONDITIONSMIN TYP MAX UNITS t PB PB RST = V IL ●40ms t RST RESET Active Time ●2506101000ms t ST ST Pulse Width●20ns t RPD V CC Detect to RST and RST ●100ns t f V CC Slew Rate 4.75V–4.25V ●300µs t RPU V CC Detect to RST and RSTt R = 5µs●2506101000ms (Reset Active Time)t R V CC Slew Rate 4.25V–4.75V ●0nst TDST Pin Detect to RST and RST TD = GND ●60150250ms (Watchdog Time-Out Period)TD = Floating ●2506101000ms TD = V CC●50012002000ms C IN Input Capacitance 5pF C OUTOutput Capacitance5pFNote 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.Note 2: All voltage values are with respect to GND.Note 3: The PB RST pin is internally pulled up to V CC with an internal impedance of 10k typical. The TD pin has internal bias current.Note 4: Measured with outputs open.Note 5: The RST pin is an open drain output.The ● denotes the specifications which apply over the full operating temperature.V CC = full operating range.AC CHARACTERISTICSRECO E D ED OPERATI G CO DITIO SU U U U WW456Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.7Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● LW/TP 1002 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORA TION 19928。
ELECTRONICSFOR SPECIAL ORIGINALEQUIPMENTEnergy Management Drive Train Components Lighting electronics2You will find everything you need to know about our electronics portfolio here./soe-electronics3/switch4Careful use of energy by appropriately influencing the consumer:These electronic systems make it possible to monitor and plan the energy budget and maintain the power supply.Angular position sensorsAir quality monitorActuatorsLED light control unitTemperature sensorsRocker switchesRemote controls Rain/light sensors Increasing the safety and efficiency of the overall system and preventing failures:These electronic systems make it possible to precisely measure and record values in the engine compartment and drive train.Oil pressure sensors Oil level sensorsPedal sensors Pedal sensorsVoltage stabilisers Intelligent battery sensorsTurbo actuatorsControl unit for flashing sidemarker lightsEnergy Managementfrom page10Drive Trainfrom page 25Componentsfrom page 52Lighting electronicsfrom page 13656789101113PIN ASSIGNMENTPin 1: supply voltagePin 2: connection for LIN bus14PIN ASSIGNMENTPin 1: partial voltage 12 VPin 2: connection for LIN busPin 3: supply voltage 24 V.151617PIN ASSIGNMENTPin 1: connection for LIN bus Pin 2: connection for B+Ø 16,2 013,5 ( 14 )For illustrative purposes only 181920FUNCTIONAL DIAGRAMRadio, CD playerNavigationDC/DC converter21TECHNICAL DATAOperating temperature-40 to + 85°C(- 40 °C to -20 °C bypass mode) Supply voltage+ 6.0 V to +18 V Stabilization range+ 6.0 V to +12 VOutput voltage(boost mode) 12 V +/- 0.5 VRippel < 200 mV Power200 W Storage temperature-40 to +105 °C22TECHNICAL DATAOperating temperature-40 to + 85°C(- 40 °C to -20 °C bypass mode)Supply voltage+ 6.0 V to +18 VStabilization range+ 6.0 V to +12 VOutput voltage(boost mode) 12 V +/- 0.5 VRippel < 200 mVPower400 WStorage temperature-40 to +105 °C2324DRIVE TRAINTurbo actuatorsUniversal Turbo Actuator (UTA)2526APPLICATIONIn vehicles, oil sensors ensure that the engine cannot work PRODUCT FEATURESContinuous measurement of the engine oil level in the static and dynamic rangeCompact sensor architecture with a multi-chip module Integrated temperature sensorImmediate measurement after switch-on27TEMP)Temperature Duty Cycle (DC1)+160ºC 28Checksum=1000ms±100msT29313D characteristic curve:engine speed and oil temperature33engine speed and oil temperature3536APPLICATIONThe oil pressure and temperature sensor OPS+T is used tomeasure the absolute oil pressure and the oil temperature directly in the main oil channel behind the oil filter.PRODUCT FEATURES➔Continuous measurement of oil pressure➔Continuous measurement of the oil temperature ➔Robust and reliable design373813 ±10,6 - 0,8 x 45°Ø 25 min.(Ø 11,7)Rz25M12 x 1,50,020,1A ACTECHNICAL DATA Temperature range - 40°C to + 150°C Max. temperature 160°C (max. 100 h)Supply voltage 4,75 – 5,25 VOutput signal PWM Response time 2 ms Sampling frequency < 3 kHz Max. operating pressure 40 bar Overpressure60 barPressure measuring range 0.5 to 10.5 bar Temperature measuring range - 40 °C to + 160 °CProtection class IP 69KMating connector 1)872-597-501,872-597-506, Coding A1)T his accessory is not included.Available from Hirschmann Automotive.Pin 1: supply Pin 2: ground Pin 3: exitPIN ASSIGNMENTINSTALLATION SPACE2μs μsbar39404142434445464748APPLICATIONThe Universal Turbo Actuator is mostly used for VNT /VTG (Variable Nozzle Turbine / Variable Turbine Geometry)turbocharger technology for the purpose of determining reliable and precise positions. It is especially the insensitivity to magnetic PRODUCT FEATURESIntegrated electronics consisting of CIPOS (Contactless Inductive Position Sensor) position sensor, motor control and error diagnosis Short response timeSelf-blocking transmission and low current consumption for holding position49TECHNICAL DATA Rated voltage Operating voltage 10.5 V – 16 V Operating temperature-40°C to +125°CShort-term maximum temperature up to 150°COperating angle range Angular velocity (@ 20 Ncm)> 0.35°/msMax. current consumption Min. torque (@ 14 V, 0,1° / ms)> 55 NcmSensor resolutionPosition tolerance over full angle Protection class Protocol CAN or PWMMating connectorKostal, 09 4415 82, coding BØ 0,35 (2x)Ø0,35 (2x)42,1*23,6 (2x)23,4 (2x)13,60,5*6,5(2x )22,3(2x )。
3'用维修了技朮Technical Communication奥迪混合动力车型绝缘电阻故障引起整车无电动模式故障2例张东燕(广州市交通运输职业学校,广东广州510440)摘要:有一辆奥迪Q5hybrid混合动力汽车和一辆奥迪A6L e-tron混合动力汽车启动时,仪表报警,均显示混合动力系统故障,均无电动模式$初步判断故障范围在高压系统的高压线路连接以及安全控制系统$结合诊断仪读码的分析,故障范围锁定在某个或者多个高电压部件不绝缘,通过对所涉及的元件、电路等进行检测,故障点分别为电驱动的功率和控制电子单元内部积水、高电压蓄电电器内部不绝缘故障,对分别进行清理、部件更换后,车辆仪表报警灯消失,可正常电动行驶$关键词:无电动模式;绝缘电阻过;故障诊断中图分类号:U469.72文献标志码:B文章编号:1003-8639(2021)03-0072-03Two Cases of No Electric Mode Fault Diagnosis ofAUDI Hybrid Vehicle Caused by Insulation Resistance FaultZHANG Dong-yan(Guangzhou Tranffic And Transportation Vocational School#Guangzhou510440#China) Abstract:When an Audi Q5hybrid electric vehicle and an Audi A6L e-tron hybrid electric vehicle are started,the instrument alarms,indicating that the hybrid system is faulty and there is no electric mode.It is preliminarily judged that the fault range is in the high-voltage line connection of the high-voltage system and the safety control bined with the analysis of the code reading of the diagnostic instrument,the fault range is locked in one or more high-voltage components are not insulated.The fault points are the water accumulation in the power and control electronic unit of the electric drive device,and the non-insulation fault in the high voltage battery charger.After the water accumulation is cleaned up and the components are replaced,the instrument alarm light of the vehicle disappears,and the vehicle can run normally.Key words:no electric mode$low insulation resistance;fault diagnosis张东燕(1986-),男,汽车专业讲师,奥迪培训师。
1⁄8DIN Panel-Mount Programmable TimerThe PTC900 timer and PTC901clock/timer offer many features and performance capabilities that suit a wide range of industrial applications.Both can function as an elapsed timer or preset timer, while the PTC901 also offers real-time clock with date capability. The plug-in option cards allow the user toconfigure the meter for the present application, while providing easy upgrades for future needs. Both models can function as an elapsed-time indicator. By using 2 separate signal inputs and 23 selectable timer ranges, the meters can be programmed to meet most anytiming application. With the addition of a plug-in setpoint output card,they can easily become a dual or quad output preset timer. ThePTC901 can also operate as a real-time clock with the real-time clock card already installed.PTC900/PTC901 SeriesStarts at$169ߜ1⁄8DIN (50 x 97 mm) ߜ6-Digit, 14.2 mm (0.56")LED DisplayߜGreen Display or Red,Sunlight-Readable DisplayߜElapsed Timer withPreset Capability ߜCounter withPreset Capability ߜCycle CountingCapabilityߜProgrammable FunctionKeys and User Inputs ߜ4 SetpointAlarm OutputsߜCommunications andBus CapabilitiesߜPC Software Availablefor Meter Configuration ߜNEMA 4X (IP65)The meters are capable ofdisplaying time in 12- or 24-hour time formats. The 12-hour format can be displayed in hours and minutes, with or without an am/pm indication or in hours, minutes, and seconds. The 24-hour format can be displayed in hours and minutes or in hours, minutes, and seconds. The PTC901 also has a calendar display in which the day, month and/or year can be displayed. The meter will recognize leap years, and can automatically adjust for Daylight Savings time. If the application calls simultaneously for a preset timer and a real-time clock, the PTC901can handle this requirement as well.A battery-backed real-time clock plug-in card is provided with the PTC901. This card, which includes a lithium coin-cell battery, will maintain the time and date when main power is removed.The meters accept inputs from a variety of sources, including switch contacts and outputs from CMOS or TTL circuits. The input can beconfigured to trigger on the edge or level of the incoming pulse. Internal jumpers are available for selecting sinking inputs (active-low) orsourcing inputs (active-high). The front panel keys and three userinputs are programmable to perform various meter functions. The meters can have up to 4 setpoint outputs,determined by the optional plug-in cards. The setpoint plug-in cards provide dual form “C” relays (5A),quad form “A” relays (3A) or either quad-sinking or quad-sourcing open collector logic outputs. The outputs can be assigned to the timer,counter, RTC date, and RTC time. The outputs can also be independently configured to suit a variety of control and alarm requirements.Plug-in cards can also provide serial communications. These include RS232, RS485 and MODBUS ®.Display values, setpoint alarm values and setpoint states can be controlled through serialcommunications. Once the meters have been initially configured, the parameter list may be locked out from further modification entirely, or the setpoint, timer start/stop values,counter start/stop values, RTC time “set”, and display intensity can be made accessible. Lockouts areactivated through a security code or user input.PTC901, $211, shown smaller than actual size.PTC901 case and mechanics, shown smaller than actual size.P a n e a v a i l a o m e p a n e lSpecificationsDisplay:6-digit, 14.2 mm (0.56") red sunlight-readable or standard green LED Power:AC Versions:AC Power: 85 to 250 Vac,50/60 Hz, 18 VAIsolation:2300 Vrms for 1 min toall inputs and outputs;300V workingDC Versions:DC Power:11 to 36 Vdc, 14 W(derate operating temperature to40°C (104°F) if operating <15 Vdcand 3 plug-in cards are installed) AC Power: 24 Vac, ± 10%, 50/60 Hz, 15 VAIsolation:500 Vrms for 1 min to all inputs and outputs (50V working) Sensor Power: 12 Vdc, ±10%, 100 mA max; short circuit protectedKeypad: 3 programmable function keys, 5 keys totalTimer DisplayTimer Range:23 selectable ranges Timing Accuracy: ± 0.01%Minimum Digit Resolution: 0.001 s Maximum Least Significant Digit Resolution:1 hrMaximum Display:999999Current Sinking (Active-Low):V il=0.9 V max, 22 KW pull-up to 12 VdcCurrent-Sourcing (Active-High):V ih=3.6 V min, 22 KW pull-down, maxContinuous Input:30 VdcTimer Input Pulse Width:1 ms minimumTimer Start/Stop Response Time:1 ms maxFilter:Software filtering provided forswitch contact debounce; filter enabledor disabled through programming; ifenabled, filter results in 50 ms start/stopresponse time for successive pulses onthe same input terminalUser InputsType: 3 programmable user inputs; logicinputs configurable as current-sinking(active-low) or current-sourcing (active-high) through a single plug jumperCurrent Sinking (Active-Low):V il= 0.9V max, 22 KΩ pull-up to 12 VdcCurrent-Sourcing (Active-High):V ih= 3.6V min, 22 KΩ pull-down, maxContinuous Input:30 VdcIsolation To Timer Input Common:Not isolatedResponse Time: 10 msMemory: Non-volatile E2PROM retainsall programming parameters anddisplay valuesCycle Counter Display:Counter Range:0 to 999999Digit Resolution:1 cycleMaximum Count Rate:50 HzReal-Time/Date Display (PTC901):Real-Time Display:5 display formats—hr/min/second (12 or 24 hr format),hr/min (24 hr), hr/min (12 hr with orwithout AM/PM indication)Date Display:7 display formats—month/day or day/month (numeric or3-letter month format), month/day/yearor day/month/year (all numeric), day ofweek/day (3-letter day of week format)Real-Time Clock Card:Field-replaceable plug-in cardTime Accuracy: ± 5 s/month (1 min/year)with end-user calibrationBattery: Lithium 2025 coin cellBattery Life Expectancy:10 years, typicalSynchronization Interface:2-wiremulti-drop network (RS485 hardware),32 units max, operates up to 4000'Isolation To Timer and User InputCommons:500 Vrms for 1 minWorking Voltage:50V, not isolatedfrom all other commons.Timer Inputs A and BType:Logic inputs configurable as current-sinking (active-low) or curren-sourcing(active-high) via a single plug jumperComes complete with operator’s manual.Note:Adding option cards—meters can be fitted with up to 2 optional plug-in cards, however, only 1 card from each function type can be installed at a time. The function types include setpoint alarms and communications. The cards can be installed initially or at a later date. Each optional plug-in card is shipped with installation and programming instructions.Ordering Examples: PTC901-GN-LV, timer/real-time clock, green display, 11 to 36 Vdc, 24 Vac, LDP6-CDS10, dual setpoint, relay output card, $255 + 37 = $292.PTC900, timer, red display, 85 to 250 Vac, 50/60 Hz,$169.Environmental Conditions:Operating Temperature Range:0 to 50°C(32 to 122°F) [0 to 45°C (32 to 113°F) with all 3 plug-in cards installed]Storage Temperature Range:-40 to 60°C (-40 to 140°F)Operating and Storage Humidity:0 to 85% max RH non-condensing Altitude:Up to 2000 metersConnections:High-compression,cage-clamp terminal blockAll models shown smaller than actual size.Construction:This unit is rated for NEMA 4X (IP65) outdoor use, IP20touch-safe, Installation Category II,Pollution Degree 2, 1-piece bezel/case,flame-resistant, synthetic rubberkeypad—panel gasket and mountingclip includedWeight:286 g (10.1 oz)Output Modules:For complete specifications, see LDP63100 Series,page M-100PTC901-LV,$239.PTC900,$169.PTC901,$211.CANADA www.omega.ca Laval(Quebec) 1-800-TC-OMEGA UNITED KINGDOM www. Manchester, England0800-488-488GERMANY www.omega.deDeckenpfronn, Germany************FRANCE www.omega.fr Guyancourt, France088-466-342BENELUX www.omega.nl Amstelveen, NL 0800-099-33-44UNITED STATES 1-800-TC-OMEGA Stamford, CT.CZECH REPUBLIC www.omegaeng.cz Karviná, Czech Republic596-311-899TemperatureCalibrators, Connectors, General Test and MeasurementInstruments, Glass Bulb Thermometers, Handheld Instruments for Temperature Measurement, Ice Point References,Indicating Labels, Crayons, Cements and Lacquers, Infrared Temperature Measurement Instruments, Recorders Relative Humidity Measurement Instruments, RTD Probes, Elements and Assemblies, Temperature & Process Meters, Timers and Counters, Temperature and Process Controllers and Power Switching Devices, Thermistor Elements, Probes andAssemblies,Thermocouples Thermowells and Head and Well Assemblies, Transmitters, WirePressure, Strain and ForceDisplacement Transducers, Dynamic Measurement Force Sensors, Instrumentation for Pressure and Strain Measurements, Load Cells, Pressure Gauges, PressureReference Section, Pressure Switches, Pressure Transducers, Proximity Transducers, Regulators,Strain Gages, Torque Transducers, ValvespH and ConductivityConductivity Instrumentation, Dissolved OxygenInstrumentation, Environmental Instrumentation, pH Electrodes and Instruments, Water and Soil Analysis InstrumentationHeatersBand Heaters, Cartridge Heaters, Circulation Heaters, Comfort Heaters, Controllers, Meters and SwitchingDevices, Flexible Heaters, General Test and Measurement Instruments, Heater Hook-up Wire, Heating Cable Systems, Immersion Heaters, Process Air and Duct, Heaters, Radiant Heaters, Strip Heaters, Tubular HeatersFlow and LevelAir Velocity Indicators, Doppler Flowmeters, LevelMeasurement, Magnetic Flowmeters, Mass Flowmeters,Pitot Tubes, Pumps, Rotameters, Turbine and Paddle Wheel Flowmeters, Ultrasonic Flowmeters, Valves, Variable Area Flowmeters, Vortex Shedding FlowmetersData AcquisitionAuto-Dialers and Alarm Monitoring Systems, Communication Products and Converters, Data Acquisition and Analysis Software, Data LoggersPlug-in Cards, Signal Conditioners, USB, RS232, RS485 and Parallel Port Data Acquisition Systems, Wireless Transmitters and Receivers。
Lithium-Ion Cell PTC Limitations and Solutions for High Voltage Battery ApplicationsE. Darcy, NASA-JSC, Houston, TX, USAF. Davies, Hernandez Engineering, Houston, TX, USAJ. Jeevarajan, Lockheed Martin, Houston, TX, USAP. Cowles, COM DEV, Cambridge, Ontario, Canada ProblemMost commercial, cylindrical lithium-ion cell design are equipped with a positive thermal coefficient (PTC) current limiting switch to provide hazard protection against short circuits external to the cell. This device, shown in Figure 1, is thin annulus consisting of a specially irradiated polyethylene laminated with a metal on both sides [1]. When exposed to an overcurrent situation, this normally conductive polymer heats up and changes phases to become several orders of magnitude more resistive. Once the short is removed, the PTC cools down and returns to its electrically conductive state. This device has been a very effective method of providing reliable short circuit protection in low voltage battery assemblies.However, when 8 or more fully charged cells in series are shorted, the first PTC that trips in the series strings can experience a large voltage drop that exceeds its voltage rating (~30V) and will cause it to fail. Such tests performed at COM DEV and at NASA-JSC have revealed that sparks and flames accompany these failures. The PTC usually fails shorted, becoming a charred substance. In a large series string, then the first cell PTC that fails shorted will transmit the problem to the next PTC to trip and the cascading series of flames and sparks will follow. This occurs because slight manufacturing variances in the resistance and trip points of the PTC prevent them from tripping in unison to distribute the large short circuit voltage drop among them.SolutionA simple electrical protection scheme using bypass diodes is proposed to protect the cell PTCs from overvoltage conditions. The idea consists of placing a bypass diode in parallel with groups of 6 cells in series as shown in Figure 2. During a short, the diode in parallel with the first PTC to trip will shunt the current away from the PTC until other cell PTCs in other series group of cells trip and share the voltage drop from the short circuit condition. This scheme protects the PTC from large voltage drop surges until the drop can be equitably distributed along the long series string of cells.Verification and AnalysisA number of different tests have been completed and are still underway to characterize and understand the behavior of cell PTCs under high voltage conditions and to validate the diode protection scheme.Single cell tests with a power supply in series determined that; (a) the PTC fails when exposed to a voltage drop > 31.3V when starting at 65°C, (b) PTC failures cause sparks, flames, and heat that sometimes melts the plastic gasket of the crimp seal, and (c) if the voltage drop is slowly applied the PTC can tolerate much higher voltages without failure. Analysis of high frequency current and voltage data combined with destructive physical analysis of the cells reveal that the overvoltage that the PTCexperiences causes the polyethelyne to char and form alow resistance short. The neighboring crimp seal gasketalso melts in some cases causing the negative can to bond to the positive lid of the cell, but in some cases the PTC is in the short circuit path and holds down short circuitcurrent until separator shutdown occurs, preventingthermal runaway. The source of the sparks and flames isstill under investigation. Cell destructive physical analysis confirmed that the separator porosity clogging wasoccurring at designed. A detail discussion of the results of these findings and the suspected mechanism for PTCfailure will be explained.A battery submodule consisting of 5 parallel strings of 41cells in series was assembled with a small 10A Schottkydiode in parallel with every six cells in series at Com Dev.This building block cells is the Sony HC 18650 lithiumion cell. The battery submodule was subjected to anexternal short < 10 mohms. As shown in Figure 3, 40milliseconds after the short, we recorded a peak current of 312 A and obversed that the short was gracefullyshutdown in < 0.5 sec by the cell PTC. Thereafter, thesubmodule was successfully recharged and dischargedwith very little capacity degradation.Bundles of 24-cells in series will be used to validate thediode selected for our application under worst casethermal conditions. These results will also be presented.REFERENCES1. Raychem Circuit Protection Handbook.Figure 1. The cathode end of a 18650 lithium ion cell.Figure 2. One string of 41 cells with a small diodebypassing every sixth cell.Figure 3. Current vs. time during the short circuit test of a 41S-5P battery submodule with bypass diodes in parallelwith every 6 cells in series.Polymer-aluminiumtagdisktagaluminium Poly seal,with。