Internal field study of 21700 battery based on long-life embedded wireless temperature sensor

Abstract

The safety of lithium-ion batteries is an essential concern where instant and accurate temperature sensing is critical. It is generally desired to put sensors inside batteries for instant sensing. However, the transmission of internal measurement outside batteries without interfering their normal state is a non-trivial task due to the harsh electrochemical environment, the particular packaging structures and the intrinsic electromagnetic shielding problems of batteries. In this work, a novel in-situ temperature sensing framework is proposed by incorporating temperature sensors with a novel signal transmission solution. The signal transmission solution uses a self-designed integrated-circuit which modulates the internal measurements outside battery via its positive pole without package breaking. Extensive experimental results validate the noninterference properties of the proposed framework. Our proposed in-situ temperature measurement by the self-designed signal modulation solution has a promising potential for in-situ battery health monitoring and thus promoting the development of smart batteries. Graphic abstract

In-situ electronics and communications for intelligent energy storage

“…Several researchers have attempted various methods of integrating communication at a cell level; including capacitive coupling [9] , [10] , wireless radio [11] and to some degree low frequency power-line communication [12] , [13] , [14] but none of these solutions develop powerline communication in-situ of a cell, previous work has mounted externally and therefore sensor readings may not reflect the true state of health of the cell and the impact of embedded such technology within a pouch cell is undefined. There are a number of challenges associated with introducing sensors into Li-ion cell systems, including a harsh chemical environment, thermal effects causing expansion of materials and temperature gradients and electrical and mechanical interference can be encountered during normal cell usage.…”

Analysis and Estimation of Internal Temperature Characteristics of Lithium-Ion Batteries in Electric Vehicles

“…The other experimental method is to drill a hole in the surface of the battery, where a temperature sensor is embedded to capture the internal temperature of the battery in real time. 7 It is usually necessary to cover the probe with an insulating layer to reduce interference from the internal components of the cell during the measurement. However, the heat resistance of the insulating layer could degrade the measurement accuracy, meanwhile the embedded thermocouple would destroy the internal structure of the battery.…”

Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

“…The development of facile monitoring methods is also necessary for a practical battery management system (BMS) with the needs of increasingly accurate and extensive parameter measurements. 23 Temperature and stress monitoring is of great concern for battery health and hence the safety, especially for pouch cells that have practical applications. Temperature monitoring methods such as infrared thermography and radiography have contributed a lot not only for commercial pouch cells but also for fundamental studies.…”