Hangzhi Precision

Battery test equipment

Hangzhi AIT Fluxgate current sensor applied for battery test equipment

About aIT high precision current sensor

Hangzhi precision high-precision current sensor is a multi-point zero-flux technology system applied to the existing high-precision DC sensor technology. The combination of excitation flux closed-loop control technology, self-excited fluxgate technology and multi-closed-loop control technology realizes the excitation The zero-flux closed-loop control of magnetic flux, DC magnetic flux, and AC magnetic flux realizes the detection of high-frequency ripple by building a high-frequency ripple induction channel, so that the sensor has a relatively high gain and measurement within the full bandwidth range A current measurement and feedback component with high precision. Usually used in power electronic equipment, electrical control systems and other fields. This article will introduce the application of high-precision current sensors in battery test equipment.

r&d Background for battery test equipment

Long battery life is one of the major requirements for electric vehicles and off-grid renewable energy storage technologies. These fields require high-power batteries that can operate reliably for 20-30 years or more. Achieving long-life batteries, however, is not an easy task, and one of the challenges is the precise measurement of tiny decay increments.

Batteries are one of the longest development-cycle components in electric vehicles and a major bottleneck in off-grid renewable energy storage applications. To meet future energy demands and environmental protection requirements, there is a global “race” to develop reliable and long-lasting batteries. In this competition, precision battery testing is considered to be a key driver to improve the performance of long-life batteries, so battery testing equipment for battery production status monitoring and end-of-line factory testing is also crucial.

Battery test equipment

Pain points of using Tradition method

Traditional lithium battery testing equipment usually uses shunt elements or Hall current sensors for current sampling control.
The accuracy of shunt measurements is affected by connection errors, temperature errors, frequency errors, drift errors over time, and thermal EMF errors within the shunt characteristic range.
Hall current sensor has large zero drift and temperature drift, so it is not suitable for high-precision lithium battery test equipment.

Hangzhi zero fluxgate current sensor solution

In order to solve these problems, Hangzhi independently developed and produced a high-precision current sensor based on the fluxgate principle, which has many advantages. Firstly, it has an accuracy of 10ppm, which can provide highly accurate current measurement results; secondly, it has the characteristics of wide range, which can meet the test requirements of different current ranges; in addition, Hangzhi’s current sensor also has low zero drift and low temperature drift. characteristics, which ensure accurate zero-point measurement and stability in different temperature environments; most importantly, these sensors have high reliability, undergoing strict quality control and reliability tests, they can be maintained in long-term tests and applications stable performance.

Hangzhi high-precision current sensor can replace the shunt element or Hall current sensor on the traditional test equipment, thus effectively eliminating the problem of low acquisition and control accuracy, and can also avoid errors caused by temperature drift.

In order to ensure the quality of lithium batteries, the overall accuracy of lithium battery test equipment must meet high requirements and standards, so it is very important to use current sensors with higher precision and higher performance. Hangzhi AIT series high-precision current sensors are your ideal choice.

Hangzhi developed AIT high-precision current sensor based on the fluxgate principle for high-precision and high-performance applications such as MRI equipment. Compared with traditional Hall effect sensors, the fluxgate high-precision sensor has the following advantages:

High precision: 10ppm
Full range: 1%-100% accuracy of a single product is consistent
Small temperature drift: good consistency, temperature influence, 0.1PPM/degree
Linearity: up to 2ppm
Wide Bandwidth: (up to 800kHz @±3 dB)
Response time: 1μs
Operating temperature range: -40..+85 °C
Stability (0.2 ppm/month)
AC and DC universal: can measure AC, DC, pulse current
Intelligent: load start overload protection, self-recovery

The fluxgate high-precision current sensor can provide more precise current control, making the MRI imaging quality higher; in addition, the high stability of the sensor also ensures the accuracy of imaging. Fluxgate high-precision current sensors can also be used in other fields of high-precision electrical measurement requirements, such as precision power control, power analysis, calibration equipment, and laboratory measurement equipment.

About Hangzhi

Shenzhen Hangzhi Precision Electronics Co., Ltd. is a technology-leading enterprise dedicated to the R&D, production, sales and solution customization of high-precision current sensors, voltage sensors, and high-precision electrical measuring instruments. We strive to build a well-known brand of precision current sensors and precision electrical measuring instruments in the DC field, and strive to develop into an international leading company in precision electronics in the field of DC systems.

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