Current Situation and Challenges
Growing demands for cell voltage measurement driven by secondary battery performance improvements
In recent years, as battery performance continues to improve, accurate and safe evaluation during the inspection process has become essential to maximize their performance and ensure reliability. In this inspection process, the current, voltage, and heat generation of cells are measured during repeated charge and discharge cycles to evaluate their characteristics. Additionally, cell voltage measurement is performed to monitor ambient temperature and discharge characteristics during aging process.
Furthermore, with the increase in battery capacity, multi-point measurement is required to inspect a large number of cells and modules simultaneously. In particular, when multiple cells are stacked in series, the common mode voltage increases, requiring measurement equipment with high withstand voltage capabilities. Moreover, accurately evaluating transient responses requires high-speed and high-precision measurement capabilities.
Yokogawa's Solutions
Accurate and safe battery evaluation with multi-point high-voltage, high-speed cell voltage measurement
Yokogawa provides optimal measurement equipment for cell voltage measurement during charge and discharge testing, as well as aging processes. For large-scale measurements with a large number of cell layers, the SMARTDAC+ GM data acquisition system is ideal, offering high withstand voltage capabilities and multi-point data collection. For measurements requiring space savings and high-speed sampling, we offer the ultra-compact multi-sensing remote I/O analog sensing unit VZ20X. These devices are capable of collecting various analog signals such as current, voltage, and temperature, and their excellent noise resistance enables accurate and safe measurements. We also offer software that allows you to easily monitor the collected cell voltages.
Advantages of SMARTDAC+ GM and VZ20X
SMARTDAC+ GM: Ideal for large-scale measurements
SMARTDAC+ GM is a data logger with a block structure that allows you to easily combine the necessary modules, offering excellent versatility, scalability, and ease of maintenance. It is suitable for cell voltage measurement in applications with a large number of stacked cells and high common-mode voltage, with synchronized measurement of up to 420 channels and basic insulation performance up to 1,000 V.
VZ20X: Suitable for space-saving and high-speed measurement
The VZ20X is an analog sensing unit that is smaller than a business card and lightweight, making it one of the smallest in the world. One-unit measures multiple types of analog signals such as current, voltage, and temperature. This is ideal for systems that require high-speed measurement and space savings, with sampling speeds of up to 1 ms and 120 synchronized measurements.
Easy cell voltage monitoring with GA10
GA10 is PC-based data logging software. It can connect to up to 100 devices and handle up to 10,000 tag data points. This makes it easy to monitor and process data without the need for program creation or complex settings.
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GM |
VZ20X |
|
|---|---|---|
|
Maximum me asurement point & sampling intervals |
420 points (Scan Interval 100 ms or more) |
120 points time synchronization (8 points per unit, up to 15 units) |
|
Input types |
DCV (direct current voltage) |
DCV (direct current voltage) |
|
Measurement accuracy (DCV) |
0.05% of rdg |
0.025% of FS (when the fi lter is on) |
|
RJC accuracy |
±0.5°C (ambient temperature 23±2°C) |
±2°C (ambient temperature 23±2°C) |
|
Maximum voltage between channels |
300VAC/DC |
300VAC/DC |
|
Common mode maximum voltage |
600 VAC/DC (double insulation) |
300VAC/DC |
|
Data storage |
Internal memory External media (SD/ SDHC) |
Data is saved to a PC or similar device via Ethernet communication. |
|
Dual sampling |
Available |
Not available |
Solution Implementation Image
Group-specific aging measurement of EV batteries
The voltage and temperature of multiple batteries are measured for each inspection group. SMARTDAC+ GM is used to measure voltage and temperature. It accurately and safely collects data from multiple points. The measured cell voltage can be measured and recorded at separate timings for each group using the GA10 data logging software.
Multi-data collection
It is possible to collect and record data independently for each group.
Measurement and recording at individual timings
Recording can be started and stopped based on predefined measurement thresholds, allowing only the necessary data to be recorded.
Related Industries
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Battery Manufacturing
This page introduces Yokogawa's messages and solutions for the Battery Manufacturing industry, showcasing our specialized offerings and expertise.
Related Products & Solutions
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Modular GM10
SMARTDAC+TM GM10 data logger has a modular architecture that can acquire necessary data. By supporting not only I/O but also many communication protocols such as 920MHz wireless, Modbus and so on. Monitor and setting changes are available through Bluetooth. Supporting FDA 21 CFR Part11 and AMS2750E/NADCAP.