1、Comparison of the battery test protocols of China and USABC Contents of test manual from USABC No. Test items No. Test items 1 Static Capacity 7 Thermal Performance 2 Hybrid Pulse Power Characterization Test 8 Energy efficiency 3 Charge-Sustaining Available Energy 9 Charge-Sustaining cycle life 4 Ch
2、arge-Depleting Available Energy 10 Charge-Depleting Cycle life 5 Self-Discharge 11 Calendar life 6 Cold Cranking 12 Reference Performance The principal objective of Any test procedures is the comparison of the battery performance with battery targets for Plug-in hybrid electric vehiclesContents of t
3、est manual from China No. Test items No. Test items 1 Basic Properties(appearance, Polarity, Weight and size) 5 Hybrid pulse test 2 AC resistance 6 Cycle life test 3 Capacity(20 o C,-20 o C,55 o C) 7 Self discharge 4 Power test 8 Safe test(Short circuit, Extrusion, Needle test, Drop test , High temp
4、erature test, Over charge or discharge) For single battery test and only detect the performance of the battery with no reference goalsUSABC CS energy CD energy Cold Crank Calendar life Reference Performance Commen Capacity Hybrid pulse test Cycle life test Self discharge Thermal Performance China Ba
5、sic Properties AC resistance Safe test Comparison of two methodCapacity Test Method Battery Fully-charged state 1h rest Discharge voltage limit Manufacturer- specified DOD min 0.5C charge to 4.2V,clamped at 4.2V until to 10% I 0 Manufacture-specified(from literature or 55% of the maximum charge volt
6、age) 1C discharge to 3.0V USABC China Same :test procedure and 1h rest before test Different :how to specify the DOD min and DOD maxHybrid Pulse Test Performance characteristics to derive: Resistance Power Capability Charge-Sustaining Available Energy Charge-Depleting Available Energy Available Powe
7、r Intended to determine dynamic power capability over the devices useable voltage range using a test profile that incorporates both discharge and regen pulses. USABC HPPCHPPC t 0 t 1 t 2 t 3 0 1 0 1 discharge discharge I V Resistance Discharge t t t t I I V V = = 2 3 2 3 regen V Resistance Regen t t
8、 t t regen I I V V I = =HPPC dis dis MIN dis dis MIN arg MIN V OCV V OCV I V V Capability Power Pulse Discharge = = e disch MIN dis R V OCV regen regen regen MAX regen MAX regen regen MAX OCV V OCV V I V R OCV V = = MAX V Capability Power Pulse Regen Results:CS available energy and power ,CD availab
9、le energy and power Pulse Power Test from China sec) 5 ( , I V Resistance Discharge discharge discharge = = T Results: Energy Efficiency Discharge ResistanceCycle life test USABC Charge Sustaining Charge- Depleting Verify stable operation at the selected SOC point before test Reference performance t
10、est every 30000 cycles Every profile : -6.2Wh Start at 10%DOD Recharge every 5 cycles Reference performance test every 2500 recharge Every profile :545.6Wh Cycle life test China General cycle life Working condition cycle life Charge to 20% DOD every cycle Voltage:4.2V for charge and 3V for discharge
11、 Reference performance test every 25 cycles Start at 30% DOD Repeat the test profile 100 times as a cycle 40%DOD 1 cycle , 50%DOD 2 cycles , 60%DOD 2 cycles , 50%DOD 2 cycles , 40%DOD 1 cycle , 30%DOD 1cycle End-of-test condition: degradation of the battery capacity is more than 20%Self discharge Da
12、ys in Time Stand ) ( Discharge Self part2 part1 test before C C C + = USABC China Capacity measurement discharge use a constant scaled 10-KW rate to voltage limit(Wh) discharge use 1C current to voltage limit(Ah) Test condition remove the CD available energy full charged state Test temperature 30 o
13、C 20 o C and 55 o C Nominal interval 7 days or interval yield capacity loss of more than 5% 28 days at 20 o C and 7 days at 55 o C Capacity recovery: there must be no visible capacity loss before and after self discharge test Thermal Performance Laboratory cell level: Characterize the performance as
14、 a function of temperature Bound the likely constraints on thermal management System level: Thermal management system design and behavior USABC China Initial Fully Charge Temperature 30 o C 20 o C Target Temperature Not specify(-30 to +52 o C) -22 o C and +55 o C Thermal Equalization Time 4-8h 16h a
15、t -22 o C and 5h at 55 o C Test Content capacity test Low HPPC test capacity test Hybrid pulse test DC resistances Objective fraction of the CS Available power target energy efficiency at various temperatureCalender life test Careful planning and analysis of calendar life tests are critical to estim
16、ation of battery life with high confidence. Calender life esimmates are necessarily based on accelerated test methods(High temperature) Achieve high rates of deterioration to minimize test time and cost Avoid introducing irrelevant failure modes at too high temperature Interesting cooperation area The life accelerating test method. The safety performance evaluation grade definition Mechanism of safety
