July should be the highest temperature season of the year, and it is also the time when the power grid load surges, which brings a lot of pressure to the safety of energy storage systems, similar to the frequent occurrence of safety accidents caused by thermal runaway and over-current. Energy storage systems have extremely high real-time requirements for current detection, and a slight delay can lead to disaster. Traditional current sensors respond slowly and cannot cut off the fault current in time, resulting in the expansion of accidents. The AN1V PB302 series current sensor miniature Hall current sensor launched by CHIPSENSE responds ultra-fast at 0.0025ms (2.5 microseconds), or becomes the "last line of defense" for energy storage safety.
1.The urgency of over-current protection for energy storage batteries
The "death" chain of thermal runaway is generally like this: over-current → local overheating → electrolyte decomposition → fire and explosion. And this phenomenon is like a domino effect. Once a battery cell is ignited, the huge amount of heat released will be quickly transferred to the adjacent battery cells, triggering a chain reaction, and the fire will spread rapidly. Accompanied by the release of a large amount of heat and high temperature, this heat is enough to ignite all the combustible materials around, forming an extremely dangerous fire environment.
Last year, the container battery energy storage system fire incident in Escondido, California, sounded the alarm about energy storage safety, and the importance of current detection, especially the overcurrent protection delay issue, should be given high attention.
2.Limitations of traditional solutions
The traditional Hall effect current sensor has a response time of about 5ms and cannot intercept transient over-current. There are also defects such as slow response, low accuracy and weak anti-interference ability of traditional Hall current sensors, which are difficult to meet the requirements of energy storage safety assurance. CHIPSENSE is trying to break this situation.
The core advantages of the AN1V PB302 current sensor from CHIPSENSE
1.Based on ASIC technology: CHIPSENSE AN1V current sensor is based on ASIC (application specific integrated circuit) chip design, which is superior to traditional Hall sensors in terms of processing speed, accuracy and reliability.
2.Very-fast response time: The tracking time @90% IPN is only 2.5 μs (0.0025ms), which is much faster than the traditional solution. CHIPSENSE AN1V PB302 current sensor can quickly and accurately detect abnormal current and transmit the signal to the protection system to quickly cut off the circuit to prevent damage or dangerous situations. In addition, CHIPSENSE AN1V PB302 current sensor is soldered into the circuit board, which in turn improves the reaction time of the overall system. Once the current abnormality is detected, the overall cut-off time can be greatly improved.
3.High-precision detection: gain error ± 1%, zero point error ± 5mV, to ensure accurate over-current threshold judgment.
4.High output bandwidth: The output bandwidth of 250kHz helps to speed up the response speed of CHIPSENSE AN1V current sensor. In the case of a short circuit in an energy storage battery, the current sensor may surge from normal operating levels to dangerous levels in a very short time. An AN1V current sensor from CHIPSENSE with a higher bandwidth can identify this change faster and pass the signal to the control system or protection device so that action can be taken as soon as possible (such as cutting the circuit), thereby reducing the risk of damage to the battery and improving the overall safety of the system.
5.Insulation and reliability: CHIPSENSE according to 4.8kV AC isolation withstand voltage, UL94-V0 housing, suitable for high voltage environments of energy storage systems.
Of course, CHIPSENSE AN1V PB302 current sensor also has many advantages, such as a comprehensive upgrade of magnetic core materials; measurement range from 50 to 300A, suitable for various measurement scenarios; working range: -40 to 150 ° C to cope with various extreme environments; support unidirectional or bidirectional current measurement, a wider range of applications.
The AN1V PB302 series current sensor is a series of high-performance miniature Hall current sensor products fully upgraded by CHIPSENSE, which not only ensures the measurement accuracy, but also greatly improves the response speed and stability of the current sensor. It is lightweight and portable, easy to install and deploy. With a response time of 0.0025ms, it cuts off the thermal runaway chain and guards the "last 1mm safe distance" of the energy storage system.
CHIPSENSE current sensor has a very good performance in it.
CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies. CHIPSENSE is committed to providing customers with independently developed sensors, as well as diversified customized products and solutions.
“CHIPSENSE, sensing a better world!
www.chipsense.net