Measurement and management of CCCV charging current of lithium-ion battery and charger

- Lithium-ion batteries are charged using the constant-current, constant-voltage (CCCV) method, which manages voltage and current.
In CCCV charging, when the cell voltage is low, the current is constant. When the cell voltage reaches 4.2V,
the charge becomes a constant voltage charge, and the amount of current is reduced so that it does not exceed 4.2V.

- Lithium batteries require highly accurate control of charging voltage and charging current.
The PSA-series has an extremely small input resistance of approximately 40 mΩ (±5 A type and ±2 A type), enabling highly accurate measurements.

- Since measurement is made with a very small shunt resistance, voltage drop is small.
　　It can be used for current measurement of low-voltage devices and evaluation of battery and battery charge/discharge characteristics.

Overview

■Lithium-ion batteries require high-precision management of both charging voltage and current due to the characteristics of lithium.
The PSA Series current meters feature an extremely low input resistance of approximately 40 mΩ (for ±10A, ±5A, and ±2A types), enabling high-precision measurement.

■Due to its extremely low shunt resistance, voltage drop is minimal, making it suitable for measuring current in low-voltage equipment and evaluating the charging and discharging characteristics of batteries.

■Lithium-ion batteries require high-precision, real-time management of case temperature and strain, which expand due to heat.
The ST Series strain/pressure gauges allow selection of excitation voltage (2.5V/5V/10V/other voltages) and bridge resistance (120Ω/350Ω, etc.).
The HT-T Series thermistor temperature gauges enable measurement with high conversion accuracy (within ±0.05％ of reading ＠ 0 to 150℃) using a proprietary B2 constant logarithmic approximation calculation.

What this measurement can do

For constant current voltage charge measurement of rechargeable batteries of various mobile devices.

　 Examples of mobile devices: smartphones, wireless earphones, wearable devices, hair irons, laptop computers, etc.

- CAN 1ms update and 16bit analog 1ms update can be output simultaneously (option)

- Setting and logging are possible through the ammeter's USB Type-C connector using COCORESEARCH's measurement management software LINKSHIP (free download).

Monitoring CAN data such as temperature, strain, and voltage; shutoff during overheating or overvoltage

■Verify CAN data parameters like battery and inverter temperature, strain, and voltage using a CAN converter
＞[Reference] Analog conversion of CAN data for verification. No CAN analyzer required

■Shutoff during abnormalities is also possible with a CAN data detector
＞[Reference] Compares and evaluates 15 CH of CAN signals per channel, providing contact (alarm) output

Selection Points

Current Measurement

■16bit analog output with 1ms update rate, CAN communication available (option)
Enables real-time current measurement and feedback control

Strain Measurement

■16bit analog output with 1ms update rate, CAN communication available (option)
Selectable applied voltage for strain gauges, 2.5V, 5V, 10V, or other voltages (specify at order)
Selectable bridge resistance, 120Ω or 350Ω

Temperature Measurement

■16bit analog output with 1ms update rate, CAN communication available (option)
-Thermistor temperature meter, High conversion accuracy (within ±0.05％ of reading ＠ 0 to 150℃) using proprietary B2 constant logarithmic approximation calculation
-Thermocouple meter, Supports thermocouple types K, J, R, E, T, B, N, S via setting switch (-270℃ to +1820℃)

Low Cost

■Low-cost models, Current meter PSAL-2401 / Strain gauge/pressure gauge STL-2401 / Thermocouple meter HTL-2401 / Thermistor meter HTL-2401T
High-precision (16bit, update time 40ms or faster) analog output available (option)

Custom Enclosure Solutions

■Custom configurations are possible, combining multiple instruments like ammeters/voltmeters/strain/pressure gauges/thermocouple meters/thermistor temperature meters into a single enclosure
Freely select instrument combinations, quantities, connectors, etc.

Products Overview　

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DC current input (ammeter)

Main features

- Suitable for real-time PWM current measurement and feedback control

- Low shunt resistance of less than 40mΩ: also for charging current evaluation [±10A, ±5A, ±2A types]

- 16bit analog output and CAN output simultaneously

- Compatible with Coco Research's measurement management software LINKSHIP (free)

- Output: USB, CAN, RS-485, Modbus, 16bit analog output, alarm (warning)

Related Products　

Customization（Many results, from 1 unit up.）

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