Q Series

Battery & Electrochemical system

Item

Description

Name

Charge

Outline

Recipe of measuring the parameter such as current decreasing time value in charging capacity or constant voltage mode with data of time, voltage, current and temperature during the charging by applying to Li-Ion Battery in a way of Constant Current (CC), Constant Current/Voltage (CC/CV), Constant Power (CP), Constant Resistance (CR).

Metadata

Charge Current, Charge Voltage, Charge Power, Charge Resistance, Temperature, V @ 0~100% SOC while Charging, dV/dQ @ 0~100% SOC while Charging, Charge Capacity, CC Charge Capacity, CV Charge Capacity, Current Decay Time Constant

Eigen Plot(Example)

1) Charge Voltage Profile

2) Voltage, Current vs Time

Item

Description

Discharge

Outline

Recipe of measuring Voltage Transient Response when applying current for discharging or when stopping applied current by calculating discharging capacity or max. current power with data of time, voltage, current, temperature during discharging Li-Ion Battery in a way of Constant Current (CC), Constant Voltage (CV), Constant Resistance (CR).

Metadata

Discharge Current, Discharge Voltage, Discharge Power, Discharge Resistance, Temperature,V @ 0~100% SOC while Discharge, dV/dQ @ 0~100% SOC while Discharge, Discharge Capacity, Highest Power, Lowest Power, Output Energy

Eigen Plot(Example)

1) Discharge Voltage Profile

2) Voltage, Current vs Time

Item

Description

Name

Charge & Discharge

Outline

Recipe of calculating the parameters of Charge Capacity, Discharge Capacity, Coulombic Efficiency by using measured values such as Voltage, Current, Temperature during the repeated cycle of Charge and Discharge Test on the secondary battery.

Metadata

Charge Capacity, Discharge Capacity, Coulombic Efficiency, CC Charge Capacity, CV Charge Capacity, Current Decay Time Constant, Highest Power, Lowest Power, Output Energy.

Eigen Plot(Example)

1) Charge/Discharge Voltage Profile

2) Voltage, Current vs Time

Item

Description

Name

Open Circuit Voltage

Outline

Recipe to measure OCV of the secondary battery by opening its electrode and measure the fine changes of OCV with high precision.

Metadata

OCV @ Time(sec, hr), DOCV @ Time(sec, hr)Initial OCV, Final OCV, Time at Final OCV, Predicted OCV, Time Constant

Eigen Plot(Example)

1) OCV

Item

Description

Name

Rest

Outline

Keep the test sample of secondary battery rested without current or voltage bias

Metadata

Eigen Plot(Example)

Item

Description

Name

Pattern Charge & Discharge

Outline

Recipe to measure the voltage response against the current bias pattern which is set by users. The current patterns can be created with a series of various current values at intervals of 10 ms or 100 ms. The patterns are to be saved separately so easily imported or edited whenever required.

Metadata

Pattern Name, Pattern Info, Initial Temperature, End Temperature, Average Temperature

Eigen Plot(Example)

1) Voltage/Current Pattern to Time(t)

Item

Description

Name

Transient Response

Outline

Recipe to measure the Transient Response. It is to measure the Voltage response against the constant current pulse bias and the High-Speed-Measurement Technology offers the precise measuring in microsecond of the voltage changes to the current bias.When Delay applied, which biases current for a certain period of time, the transient response can be measured that appears current changes, and the details of the initial voltage change can be shown by displaying the time in log scale.The parameters such as resistance to time can be calculated based on the measured data.

Metadata

Initial Voltage, Step Current, TRV @ time usec, Time @ TR1, Resistance @ TR1, Time @ TR2, Resistance @ TR2, Time @ TR3, Resistance @ TR3, TR Series Resistance (TR-Rs), TR Charge Transfer Resistance (TR-Rc), TR Diffusion Resistance (TR-Rd), Short Time Constant, Long Time Constant

Eigen Plot(Example)

1) TRA Current/Voltage (Linear Scale)

2) TRA Current/Voltage (Log Scale)

Item

Description

Name

Frequency Response

Outline

Recipe to measure the Frequency Response of secondary battery. It calculate impedance by measuring voltage response applying AC wave. The impedance change characteristic in frequency-dependent can be measured by frequency sweep as well as single result of the impedance of AC wave at the specific frequency. Nyquist plots are used to extract the parameters from the

result of frequency response.

Metadata

ReZ @ FR, ImZ @ FR, f @ FR, ReZ @ Local Maximum, ImZ @ Local Maximum,f @ Local Maximum, Semicircle Height Radius Ratio, Slope @ Low Frequency, FR Series Resistance (FR-Rs), FR Charge-Transfer Resistance (FR-Rc), FR Diffusion Resistance (FR-Rd), ReZ @ Frequency Hz, ImZ @ Frequency Hz

Eigen Plot(Example)

1) Nyquist Plot

2) Bode Plot

Item

Description

Name

DC Resistance

Outline

DCR(DC Resistance) of the battery can be measured by the voltage difference after and before applying the current steps. (The formula is as follow; DCR =(V1-V2)/(I1-I2). The proposed method referred to IEC 61960-2003 is to calculate the resistance by discharging at 0.2C for 10 sec and then at 0.1C for 1sec

Metadata

1st Current, 2nd Current, 1st Width(1st Current sampling time), 2nd Width(2nd Current sampling time), Scope Volt (x1/x100/x500 Voltage measurement precision), Temperature(Initial/End/Average), Resistance, Delta Voltage(Voltage difference between the low and high current)

Eigen Plot(Example)

Item

Description

Name

AC Resistance

Outline

Recipe to obtain the complex impedance, absolute value and phase difference by measuring the voltage and current response simultaneously after applying sin wave AC at the specific frequency to the battery.

Metadata

Current Bias, AC Amplitude, AC Frequency, Scope Volt (x1/x100/x500 Voltage measurement precision), Voltage(Initial/End/Average), Temperature(Initial/End/Average), ReZ Measurement, ImZ Measurement.

Eigen Plot(Example)

Item

Description

Name

Cycle

Outline

Recipe of repeating metro sequence with single recipe or multi-recipe.Repeat test for cycling test of secondary battery and analyze the result value for the specific recipe.

Metadata

Cycle Number, Charge Capacity, Discharge Capacity, Coulombic efficiency, FR-Rs, FR-Rc, FR-Rd, TR-Rs, TR-Rc, TR-Rd, OCV, ACR-ReZ, ACR-ImZ, DCR

Eigen Plot(Example)

1) Battery Charging/Discharging Capacity

2) Battery Coulombic efficiency

3) Battery Impedance Resistance

4) Battery Transient Response Resistance

5) Open Voltage

6) ACR Resistance

Item

Description

Name

C-rate

Outline

Recipe of repeating test by changing the metro sequence with single recipe or multi-recipe.Analyze the test result by changing efficiency during charging, transient response, frequency response and set the efficiency by performing full charging/full discharging.

Metadata

Cycle Number, Charge Capacity, Discharge Capacity, Columbic Efficiency, FR-Rs, FR-Rc, FR-Rd, TR-Rs, TR-Rc, TR-Rd, OCV, ACR-ReZ, ACR-ImZ, DCR

Eigen Plot(Example)

1) Charging/Discharging Capacity

2) Columbic Efficiency

3) Battery Impedance Resistance

4) Battery Transient Response Resistance

5) Open Voltage

6) ACR Resistance

Item

Description

Name

State Of Charge

Outline

Recipe of repeating test by changing SOC through metro sequence with single or multi-recipe. Analyze the test result of SOC during transient response, frequency response, open voltage and set SOC by performing the full charging/full discharging.

Metadata

Cycle Number, Charge Capacity, Discharge Capacity, Coulombic efficiency, FR-Rs, FR-Rc,FR-Rd, TR-Rs, TR-Rc, TR-Rd, OCV, ACR-ReZ, ACR-ImZ, DCR

Eigen Plot(Example)

1) Impedance Internal Resistance

2) Transient Response Internal Resistance

3) OCV (Open Circuit Voltage)

4) ACR Real/Imaginary Number Resistance

5) DCR Resistance