Hybrid Pul Power Characteristic面试英语口语
Revision History
dirnameTable of Contentsfemara
Revision History (2)
Table of Contents (2)
1Test Outline (3)
2Test Procedure (3)
2.1Step 1 – Castte Screening (3)
2.2Step 2 – Automated Test Cycle (3)
2.3Data Processing (8)
2.4Test Sequence (9)
2.5PASS/FAIL Test Limits (10)
2.6Test Overview Process Chart (11)
2.7Safety Limits (12)
2.8Reporting (12)
1 Test Outline
The coolant manifold and the hydrogen vent manifold of the battery unit are pressure tested or inspected to ensure proper installation. Once this test is complete, the battery unit is conditioned by charging the batteries to approximately full capacity and then balancing the batteries with a small overcharge. The true capacity is then determined by discharging the battery unit to a certain voltage and keeping track of the cumulative Amp-Hours. Once the capacity is determined, the battery unit is charged back to 100% SOC (bad on measured true capacity) and the Hybrid Pul Power Characterization (HPPC) test is run. The HPPC test is split into a discharge cycle and a charge cycle. Once the HPPC cycle has completed the battery is discharged to 60% SOC and the testing is complete.
The data collected during the conditioning and capacity tests is ud to asss available energy while the HPPC test will yield estimates of:
•Dynamic voltage characteristics
•Open Circuit Voltage (OCV) characteristics
•Burst (1c) and pul (10c) internal resistance as a function of State Of Charge (SOC)
•Burst (1c) and pul (10c) power as a function of SOC
The values will be ud to ensure the asmbled unit meets specifications and to benchmark the batteries Beginning of Life (BoL) performance for on-going technology asssments and warrantee negotiations with the battery supplier.
2 Test Procedure
The performance tests will be automated and conducted in a specific quence as described in the following ctions.
2.1 Step 1 – Castte Screening
mainlyPrior to asmbly of the battery module, the two casttes to be asmbled into the ries 24V string will have to be screened. To screen the modules, the following steps should be taken:
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1. Select 2 casttes for asmbly (they should be from the same shipment batch and may be labeled as such)
2. With an accurate digital voltmeter (Fluke or equivalent), measure the voltage across each 12V module in each2014年高考语文试卷
5 module castte.
3. There should be no more than a 100mV difference between any 2 modules. Ideally voltages are within 20mV.
4. If the module voltages between casttes exceed the 100mV, a different 2nd castte should be lected and
assd for voltage compatibility with the first.
5. If voltages are within tolerances, proceed to step 2.美国大学托福分数
2.2 Step 2 – Automated Test Cycle
The following outlines the automated test profile for one channel of the cycler. The test profile for the cond channel is identical and should be run independently (test quencing can be synchronized but test current may be different depending on the identified true capacity of the individual units).
The automated test has 3 major components to be run quentially:
1. Conditioning/Capacity Cycle: The Conditioning/Capacity Cycle consists of a full discharge at 43 A until
the battery voltage reaches the Low Voltage (LV) limit. The discharge is followed by a timed charge at 43
A and 14.3 A for 1 hour (this should theoretically return the full capacity of the battery). The 14.3 A charge
dirextis followed by a 4.3 A timed over charge (this should provide a 5% overcharge for cell balancing and
equalization). The charge cycle is followed by a 5-15 minute rest. The rest is followed by a 43 A discharge until the battery voltage reaches the LV limit. This will yield the true capacity (1C) of the battery unit.
Finally, the battery is charged for 1 hour at a rate of 1C (as measured) into bring the SOC up to 100%.
2. Discharge Cycle: The discharge cycle starts with a constant discharge at the nominal discharge current of
1C to 90% SOC, at which point the HPPC Discharge Cycle is run once. The HPPC Discharge Cycle
consists of a 250 A discharge for 10 conds followed by a 1C discharge for 30 conds followed by a
250 A charge for 10 conds. Once the HPPC Discharge Cycle has completed, a constant discharge at 1C until the next test SOC is applied (in this ca 80% SOC). The HPPC Discharge Cycle is repeated at every 10% drop in SOC until the cycle has run at 10% SOC at which point the battery is discharged at 1C until the battery voltage reaches the LV limit. The SOC is ret to 0 and then the charge cycle is started.
3. Charge Cycle: The charge cycle starts with a constant charge at the nominal charge current of 1C to 10%
SOC at which point the HPPC Charge Cycle is run once. The HPPC Charge Cycle consists of a 250 A
charge for 10 conds, followed by a 1C charge for 30 conds followed by a 250 A discharge for 10
conds. Once the HPPC Charge Cycle has completed, a constant charge of 1C to the next test SOC is applied (in this ca 20% SOC). This HPPC Charge Cycle is repeated at every 10% increment in SOC
until the cycle has completed at 90% SOC. Finally, a nominal discharge current of 1C is applied until the battery unit reaches an SOC of 60%.
The overall cycle is as shown in Figure 3below:
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Figure 2. Complete HPPC Profile.
bushnellThe HPPC Discharge and Charge Cycle details are shown in Figure 3 and 4 below. The figures show the profile test current and the corresponding anticipated voltages and voltage points of interest for PASS/FAIL parameter calculation.
