2511Battery measurement module

• 100 % incoming inspection of small cylindrical cells, e.g., 18550 for small mobile devices
• Rapid cell validation through open-circuit voltage and internal resistance measurement and evaluation
• Measurement data acquisition via fieldbus and/or USB

Task

Battery cells with elevated internal resistance generate more heat. This heat accelerates chemical aging processes, which manifest, for example, as capacity loss and increased internal resistance. Resistance can change during transport or handling. Manufacturing process errors can trigger self-discharge processes. To ensure consistent quality during the assembly of small mobile devices and the integration of batteries, test specimens are removed at individual workstations and subjected to a rapid test for AC and DC internal resistance, including cell voltage and temperature measurements.

Measuring and evaluation parameters
U_cell = 3.6 … 3.8 V
R_AC (1 kHz) = 23.50 … 24.88 mΩ
R_DC (10 Hz) = 24.80 … 25.45 mΩ
ϑ = 20 … 29 °C

• Measurement of the internal resistance and voltage of individual cells and the HV stack
• Measurement time Internal resistance at 1 kHz as well as cell and module voltage of all 16 cells in less than 0.5 s 
• Up to 5 measuring channels per device. Easy to cascade on a top-hat rail due to the small design.
• Connection via PROFINET supports flexible sequence control and measurement data acquisition

Task

Many battery cells are required to manufacture and install high-performance battery modules for electrically operated vehicles. In received goods checking area, important battery parameters of each individual cell must be reliably measured and evaluated within very short cycle times. After contacting the prismatic cells, the internal resistance with 1 kHz and the cell and module voltage of all 16 cells are measured and evaluated within approx. 0.5 s with the cascadable battery measuring module and transferred to a PLC in real time.

Measuring and evaluation parameters: Single cell
U_cell = 3.2 … 3.3 VDC
R_AC (1 kHz) = 0.4 … 0.6 mΩ

Measuring and evaluation parameters: EoL
U_stack = 760 … 800 V
R_stack = 100 … 150 mΩ

• Determination of series resistance (electrolyte) and parallel resistance (electrodes) by impedance measurement at previously set frequencies
• Additive measurement of cell voltage and temperature
• Up to 5 measuring channels per device
• Parameterization of the measurement parameters via PROFINET

Task

Many round cells are often used in battery operated large-scale storage systems. Before these are installed, different battery parameters of each individual cell must be exactly and quickly measured and evaluated in order to achieve qualitative matching. The contacting of the round cells takes place using the four-conductor measuring method (for each current and voltage cable). The two-frequency impedance measurement is used to determine the series resistance (electrolyte) and the parallel resistance (electrodes). In parallel to this, the respective cell voltage and temperature are recorded and evaluated. At the control side, the data is passed over via PROFINET. All measuring and evaluation data is archived for traceability.

Measuring and evaluation parameters
U_cell .................... ≈ 0 … 3.3 to 3.8 VDC
R_AC (1 kHz) ....... ≈ 23.50 … 24.88 mΩ
R_DC (10 Hz) ....... ≈ 24.71 mΩ
ϑ ........................ ≈ 22 … 28 °C

• Measurement of open-circuit voltage and internal resistance (AC to DC) of individual cells
• Measurement period for internal resistance and cell voltage of all 8 cells within approximately 0.4 s
• Up to 5 measurement channels per device. Easily cascaded on a DIN rail thanks to its compact design
• EtherCAT connectivity supports flexible process control and measurement data acquisition
• Fail-safe and verifiably stable over the long term

Description

The production and installation of high-performance battery modules for electrically powered drones requires a large number of battery cells. During incoming goods inspection, it is essential that important battery parameters of each individual cell be measured and evaluated reliably and quickly within very short cycle times. After simultaneously making contact with 8 cells for two 4S packs, the cascading Type 2511 battery measurement model measures and evaluates open-circuit voltage and internal resistance within approximately 0.4 s and transmits the data to a PLC in real time.