The basis of battery cell selection is a systematic and comprehensive test and evaluation of the cells. It mainly evaluates whether it meets the application requirements of lithium-ion battery systems from the aspects of cell consistency, temperature characteristics, rate characteristics, pulse power performance, cycle life performance and safety performance.
There are many test items for battery cells, so, multiple battery test equipment need to be equipped in the battery cell test station.
The table below lists the battery cell test items, as well as the concerns and evaluation indicators of each test item.
|
NO. |
Test items |
Test content or test purpose |
Test indicators |
|
01 |
Cell consistency |
Cell weight |
Mean, Range, and Standard Deviation |
|
ACIR (AC internal resistance) |
Mean, Range, and Standard Deviation |
||
|
OCV (Open circuit voltage) |
Mean, Range, and Standard Deviation |
||
|
Capacity and energy |
1)Mean, range and standard deviation of discharge capacity and energy 2) Energy density |
||
|
02 |
Temperature characteristics |
High and low temperature charging performance |
Voltage, capacity, energy, temperature coefficient and energy density |
|
High and low temperature discharge performance |
Voltage, capacity, energy, temperature coefficient and energy density |
||
|
03 |
Rate characteristics |
Charging performance at different rates |
Voltage, capacity, energy, temperature coefficient and energy density |
|
Discharge performance at different rates |
Voltage, capacity, energy, temperature coefficient and energy density |
||
|
04 |
Constant power performance |
Constant power discharge performance |
Discharge energy |
|
05 |
Pulse power characteristics |
High and low temperature pulse performance |
Internal resistance, power and available energy |
|
06 |
Energy efficiency |
High and low temperature energy efficiency |
Energy efficiency |
|
Energy efficiency at different rates |
Energy efficiency |
||
|
07 |
Open circuit voltage |
SOC-OCV curve |
- |
|
08 |
Thermal characteristics |
Thermal characteristics at different temperatures |
Thermal value, instantaneous thermal power, average thermal power, volume/weight thermal power density and specific capacity instantaneous thermal power density |
|
Thermal characteristics at different rates |
Thermal value, instantaneous thermal power, average thermal power, volume/weight thermal power density and specific capacity instantaneous thermal power density |
||
|
09 |
Thermal stability |
Thermal boundary conditions |
Primary, secondary and tertiary thermal trigger temperatures |
|
10 |
Cycle life characteristics |
Cycle life and calendar life analysis |
Cycle life and calendar life |
|
11 |
Safety performance |
Acupuncture, overcharge, overdischarge and short circuit, etc. |
smoke, fire, explosion |
WinAck Group can provide various types of lithium-ion battery cell test system according to customer requirements. Come by, contact us for a solution that can help you succeed. For better batteries, Win & Ack!
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