北京豪格：锂电池充电设计培训资料

1、15/15/2022Li-Ion battery fundamentalsn锂电池充电设计培训资料锂电池充电设计培训资料n 制作人： 雷镡25/15/2022 Battery Chemical Capacity: Qmax, QuseC-rate:Current to discharge a fully chargedBattery to EDV in one hourExample:2200-mAh battery, 1C discharge rate: 2200 mA, 1 hr0.5C rate: 1100 mA, 2hrs EDV(End of Discharge Voltage) i

2、s minimal voltage acceptable for the application or for battery chemistry, whichever is higher.35/15/2022 Battery Impedance and Capacity Vary Due to AgingnBattery impedance increase with aging nImpedance almost doubles after 100 cycles nChemical capacity reduces by 3 to 5% after 100 cycles45/15/2022

3、 Impedance: Dependent on Temperature and State of ChargeImpedance = f(Temperature, State of charge, and Aging)55/15/2022Li-Ion Discharge at Various Rates65/15/2022Charge Voltage Affects Battery Service Life nThe higher the voltage, the higher the initial capacitynOver charging shortens battery cycle

4、 life nUnder charge decrease battery capacitynCharge voltage accuracy is very important75/15/2022Charge Current versus Battery Degradation nCharge Current: limited to 1C rate to prevent overheating and resulting accelerated degradation. 85/15/2022Li-Ion Battery Safety Thermal RunawaynIncreased tempe

5、rature will cause thermal run-away and battery explosion.nRapid temperature increase if overcharged at high current or shortednUpon overcharged, active metallic lithium is deposited at the anode that may cause explosion OCV 95/15/2022Li-Ion Charge CC-CV Profile 105/15/2022Battery Management115/15/20

6、22New Cell Phone Charger Standard in ChinanYD/T 1591-2006 was published in Dec 14, 2006. ChinanUSB type A connector for cell phone charger in China.n Purpose is to share adapter and cable among different cell phones, save cost, save environment.125/15/2022Causes of System Failure Due to Input Powern

7、Wrong Adapter or After-Market AdapternTransformerRectifier Adapters (un-regulated)nHot Plug Event 135/15/2022Hot Plug and Equivalent Circuit 145/15/2022 Reducing Overshoot 155/15/2022Reverse Input Voltage to the SystemnForward-biased ESD diode, short the adapter outputnHigh current injected into the

8、 substratePower dissipation165/15/2022Charge Front End (CFE) Improves Safety nInput Transient /Steady state over-voltagenOver-Current Protection, Latch or HiccupnAdapter Reverse PolaritynIf Charger fails due to any reasonnSystem will be in over-voltage condition and FailnBattery will be over-charged

9、, and may explode or burnCFE Provide System Level Protections175/15/2022Power Path Management Charging185/15/2022Charging with an Active System Load195/15/2022Issue 1: Pre-charge and Safety Timer FaultnPre-Charge Mode: Battery voltage may not reach the fast charge voltage threshold and Pre-charge ti

10、mer may expire. Solution: keep system off or in low-power mode in pre-charge mode. Drawback: Can not operate the system while charging a deeply discharged battery simultaneously205/15/2022Issue 1: Safety Timer FaultnFast-Charge Mode: Battery is charged at a lower rate ! Charge safety timer may expir

11、e, turning off the charger. Solution: Increase the safety timer timeout value.Increase the fast charge current value. 215/15/2022Issue 2: Charge Termination NOT Detected225/15/2022Power Path Management Battery Charger235/15/2022Dynamic Power Path Management (DPPM)nDPPM function : Reduces the charge

12、current when the system voltage is VDPPM.“Finds”maximum adapter power.Battery Supplement Mode.245/15/2022Dynamic Power Path Management (DPPM)nDPPM function : Reduces the charge current when the system voltage is VDPPM.“Finds”maximum adapter power.Battery Supplement Mode.255/15/2022EUTECH Battery Cha

13、rger265/15/2022 Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating 25A Supply Current in Shutdown Soft-Start Limits Inrush CurrentProgrammable Charge Current Up to 800mA275/15/2022Linear Regulator: - 300mA Output Current (Vdrop=150mV)Synchronous Buck Converter: - I

14、nput Voltage Range: 2.6V to 5.5V - Output Voltage Range: 0.6V to VIN - 600mA Output Current Battery Charger: - Up to 500mA Charge Current - Thermal Regulation - 4.5hrs Safety Timer285/15/2022 AC Adapter or USB With Autonomous Power-Source selection Integrated USB Control With Selectable 100 mA and 5

15、00 mA Charge Rates Optional Battery Temperature Monitoring Up to 1A Charge CurrentSafety Timer in Pre-Charge/ Fast-Charge PhaseCharge Taper Dectection295/15/2022Supply Voltage: 4.3518V Programmable Charge Current up to 1A Input Overvoltage Protection: 6.6V and 11V options Thermal Regulation Terminat

16、ion by Minimum Current and Timer(adj.) Short-Circuit and Thermal Protection LDO Mode Operation for System Level Testing without Battery Insertion305/15/2022 Guaranteed to Operate at 2.65V After Start-Up Very Low Power Dissipation for up to 1.5A Charge Application Constant current mode is 100,000 tim

17、es that of the current in the RIREF resistor. Accepts Multiple Types of Adapters or USB BUS Power Charge Current Thermal Regulation 2A charge current and Programmable End-of-Charge Current in 5x5 TQFN16315/15/2022 Wide Supply Voltage: 4.7V to 20V 500kHz Switching Frequency End-of-Charge Current Detection Output 3 Hour Charge Termination Timer 1% Charge Voltage Accuracy 10% Charge Current Accuracy Low 10A Reverse Battery Drain Current Battery Temperature Sensing325/15/2022 Integrated Power-Path Management Feature All