Software Configurable Battery Features and Benefits ALLPlus+ Poster.pdf ·  · 2013-06-13Software...

• Variable power output

• Accurate fuel gauge

• High reliability

• Longer life

• Longer range

Software Configurable Battery

More accurate state of charge Standard

(Enables reduced controller costs)Variable power output Standard

Fixed Power Output

Variable Power Output

Pow

er

Time

Pow

er

Time

Lower capital cost per cycle

Char

ge

Discharge

12% Less

Char

ge

Discharge

Standard

Short term power boostStandard

NormalBOOST

NormalBoost

PWR PWR

Lossless cell balancing

100 200 300 400 500

20%

60%

40%

100%

80%

With cell balancing

No cell balancing

Ava

ilabl

e ca

paci

ty

Battery Cycles

Increased capacity (Range)Standard

Increased Range

>14%

Increased cycle lifeTime

80%

90%

100%

100%

>30%Extra Cycles

EOLStandard

Cell Ageing Rate

Immunity to cell failure

Zero Output

Standard

Full Output

Switchable Spare

Features and Benefits

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Standard

Does not need a special charger•xxxxx-#### xxxxx-####

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TM

aerovironment

info@cheevc.comThe Boathouse, Silversands, Hawkcraig Road, Aberdour, Fife, KY3 0TZ, SCOTLAND, UKWWW.CHEEVC.COM

Increase in Cycle Life Due to Rest Periods

48 Samples for each test of 300 Cycles with charge rate 0.5C (CC-CV) and discharge rate 1.0C

0

1

2

3

4

5

6

7

1360

1410

1460

1510

1560

1610

1660

1710

1760

1810

1860

1910

1960

2010

2060

2110

2160

2210

2260

2310

2360

2410

2460

Final Capacity with Rest Periods (EOL)

0

2

4

6

8

10

12

14

1360

1410

1460

1510

1560

1610

1660

1710

1760

1810

1860

1910

1960

2010

2060

2110

2160

2210

2260

2310

2360

2410

2460

Ini al Capacity with Rest Periods (BOL)

0

0.5

1

1.5

2

2.5

3

3.5

4

1360

1410

1460

1510

1560

1610

1660

1710

1760

1810

1860

1910

1960

2010

2060

2110

2160

2210

2260

2310

2360

2410

2460

Standard Cycle Final Capacity (EOL)

0123456789

10

1360

1410

1460

1510

1560

1610

1660

1710

1760

1810

1860

1910

1960

2010

2060

2110

2160

2210

2260

2310

2360

2410

2460

Standard Cycle Ini al Capacity (BOL)

>20% Improvement

79% of Cells Exceed EOL Specifications

44% of Cells Exceed EOL Specifications

Manufacturer’sEOL Specification

mAh

mAh

Num

ber

of C

ells

The redundunt cell is bypassed and rested while remaining cells carry the load

A switching matrix provides controlled accessto individual cells and an extra cell in the battery string provides redundancy and increases charge capacity

Sequential cycling rests each cell in turn so that all cells in the battery age at the same rate

The rest periods reduce stress on the cells,resulting in increased battery lifetime

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