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Programmable Battery Charge/Discharge Test System
The Chroma 17011 Battery Cell Charge and Discharge Test System is a high precision system designed specifically for testing lithium-ion batteries (LIB), electrical double layer capacitors (EDLC), and lithium-ion capacitors (LIC). It is suitable for product characteristics screening, cycle life testing, incoming and shipping inspection, material experiment, and balancing battery voltage. Based on the test characteristics and size of battery current, the Chroma 17011 test system has AC/DC bi-directional regenerative series and linear circuit series with precision output and measurement traceability to guarantee product specifications. Small errors among channels and relatively reliable test data are suitable for analyzing the characteristics differences and detecting changes in detail. The system is equipped with energy-saving design and thermal management capable of running stably for long periods and providing reliable real-life testing data. The modular design allows the system to be configured based on test requirements, and each channel can run tests independently with parallel output supported. The test system has high product compatibility and testing flexibility.
In view of energy issues, the fabrication
of green products should be in line with
production methods that are environmentally
friendly. The Chroma 17011 AC/DC
bi-directional regenerative test system has an
energy recycling function that can convert the
discharged energy to the charging channel
improving power efficiency when in use. The
excess power will feed back to grid if the
energy recovered is more than the system
requires. In addition to decreasing electricity
costs, the regenerative power function
reduces system heat significantly by lowering
air conditioning demands and operation costs.
It not only improves system stability, extends
service life, but also creates a low carbon
emission environment for production.
For small current testing and material
development, the Chroma 17011 linear
circuit series features low noise and precision
outputs, with redundant DC power supplies
which are more stable and reliable when
compared to general switching power
supplies. When a power module fails, it will
shut down automatically, and the rest of
the modules can be paralleled in order to
output sufficient power, maintaining a stable
power supply. In addition, it supports a hot
swap function that allows the malfunctioning
module to be switched without shutting down
Four current range models are available for
material research and development. The
standalone device can easily be placed on the
lab desk. This device is suitable for precision
and leakage current testing with an automatic
current shift resolution up to 0.1uA. With
data refresh rate up to 1ms in pulse mode,
it can perform rapid pulse current charge/
discharge tests on various material samples
for characteristics verification.
The lithium ion battery cell tests include
life and characteristics tests such as ACIR,
DCIR and HPPC, etc. The Chroma 17011
includes built in test steps in line with
regulations that can provide test results fast
and accurately without requiring conversion
afterwards. It provides easy operation with
low chances of human error, and can draw
battery characteristic curves via software
for specification comparison or application
For EDLC and lithium capacitors, capacitance, DCIR and leakage current tests are included. The test steps built into the Chroma 17011 comply with the standards which get the capacitance and DCIR test results with one step. It also measures the leakage current directly.
BATTERY CAPACITY TESTING
The capacity of a battery cell is usually the integral of discharge current and time, therefore having highly accurate current test equipment is important for testing. Though every battery has manufacturer labeled specifications where the low charge and discharge rates are commonly used for testing capacity, the power battery capacity and actual capacity will be different if the specifications are used as the power battery is often charged and di scharged under high charge and discharge rate. For practical use, the final battery charge and discharge rate should be used for battery cell tests in order to get a more accurate capacity.
BATTERY CYCLE LIFE TESTING
The battery cycle life is one of the most important items for testing a battery. The test uses predefined charge/discharge conditions as a cycle to test the same cell repeatedly and evaluates the cycles executed for the battery before the end condition is met. More cycles indicate longer battery cell life. The same test conditions can be used to test various battery cells for performance appraisal, or to assess the most suitable charge/ discharge and usage conditions.
The internal resistance value is related to the charge/discharge cur rent of a bat tery. The larger the internal res i s tance value, the lower the efficiency when temperature rises. The traditional LCR meter 1Khz measurement can only assess the battery sudden power output hinder caused by the resistive conductivity close to Ro (near ACIR), but unable to assess the polarization resistance (Rp) caused during elec trochemistry transition. The DCIR assessment includes the resistance of ACIR that is closer to the actual resistance effect of continuous current power battery applications. The Chroma17011 has built in two DCIR test modes: DCIR test (1) to calculate the DCIR value using the voltage difference caused by the change of one loading current; DCIR test (2) to calculate the DCIR value using the voltage difference caused by the change of two loading currents. The users can select the test mode as desired to get the test results that comply with IEC 61960 standards automatically without any manual calculation.
HPPC is a test solution created by the US Department of Energy that tests the battery power performance of hybrid and electric vehicles. The main purpose of the test is to establish the depth of discharge and power function within the batteries voltage range, with the secondary purpose of establishing the depth of discharge, conductive resistance and polarization resistance function via the voltage response curve from discharging, standing to charging within the battery voltage range. The measured resistance can be used to assess the power recession of following life test and the equivalent circuit model development of power battery. The user can automatically obtain the test results that comply with the HPPC standards without any manual calculation.
EDLC CAPACITANCE & DCIR TEST APPLICATION
The EDLC test follows the actual product application to divide the test conditions. Based on the category of IEC 62391 standard, there are 4 the >basic EDLC product application s: 1. Memory Backup, 2. Power Application, 3. Energy Storage, 4. Transient Power. Different test applications indicate different test condition and the tester should select suitable test equipment and current with accurate test device.
EDLC Capacitance Testing Curve
EDLC Internal Resistance (DCIR) Testing Curve