Experimental validation of the recovery effect in batteries for wearable sensors and healthcare devices discovering the existence of hidden time constants

Arora, Harneet; Sherratt, R. Simon; Janko, Balazs; Harwin, W.

doi:10.1049/joe.2017.0303

Cited by 13 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As is documented in the literature, long-term continuous discharging of the battery followed by a disconnection of the terminals leads to a "recovery effect," where the battery voltage relaxes to a higher equilibrium voltage level over a period of time (22,23). The magnetic sensors recorded transient fields that we associate with this voltage increase based upon the well-matched long-term time constants of the exponential relaxation to a steady-state value.…”

Section: Resultsmentioning

confidence: 89%

“…The transient fields are present even when the solenoid is turned off, which provides corroboration that they are not due to susceptibility changes in the cell. Instead, they appear to be related to internal equilibration currents, which are likely related to the concentration gradient-driven diffusion of active materials in the battery (23,24). In the overdischarge region, these currents may be exacerbated as a result of accelerated self-discharge due to corrosion of the copper current collector in the electrolyte (25).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Sensitive magnetometry reveals inhomogeneities in charge storage and weak transient internal currents in Li-ion cells

Iwata

Mohammadi

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

The ever-increasing demand for high-capacity rechargeable batteries highlights the need for sensitive and accurate diagnostic technology for determining the state of a cell, for identifying and localizing defects, and for sensing capacity loss mechanisms. Here, we leverage atomic magnetometry to map the weak induced magnetic fields around Li-ion battery cells in a magnetically shielded environment. The ability to rapidly measure cells nondestructively allows testing even commercial cells in their actual operating conditions, as a function of state of charge. These measurements provide maps of the magnetic susceptibility of the cell, which follow trends characteristic for the battery materials under study upon discharge. In particular, hot spots of charge storage are identified. In addition, the measurements reveal the capability to measure transient internal current effects, at a level of μA, which are shown to be dependent upon the state of charge. These effects highlight noncontact battery characterization opportunities. The diagnostic power of this technique could be used for the assessment of cells in research, quality control, or during operation, and could help uncover details of charge storage and failure processes in cells.

show abstract

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Sensitive magnetometry reveals inhomogeneities in charge storage and weak transient internal currents in Li-ion cells

Iwata

Mohammadi

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…In addition, the energy requests are founded on the application activities that can be proposed as a model to extend battery life time [54]. Additionally, other research studies are directed to improve and optimize the energy of different Zigbee routing procedures.…”

Section: Challenges and Future Directionsmentioning

confidence: 99%

Developing residential wireless sensor networks for ECG healthcare monitoring

Dey

Ashour

Shi

et al. 2017

IEEE Trans. Consumer Electron.

256

View full text Add to dashboard Cite

Wireless technology development has increased rapidly due to it's convenience and cost effectiveness compared to wired applications, particularly considering the advantages offered by Wireless Sensor Network (WSN) based applications. Such applications exist in several domains including healthcare, medical, industrial and home automation. In the present study, a home-based wireless ECG monitoring system using Zigbee technology is considered. Such systems can be useful for monitoring people in their own home as well as for periodic monitoring by physicians for appropriate healthcare, allowing people to live in their home for longer. Health monitoring systems can continuously monitor many physiological signals and offer further analysis and interpretation. The characteristics and drawbacks of these systems may affect the wearer's mobility during monitoring the vital signs. Real-time monitoring systems record, measure, and monitor the heart electrical activity while maintaining the consumer's comfort. Zigbee devices can offer low-power, small size, and a low-cost suitable solution for monitoring the ECG signal in the home, but such systems are often designed in isolation, with no consideration of existing home control networks and smart home solutions. The present study offers a state of the art review and then introduces the main concepts and contents of the wireless ECG monitoring systems. In addition, models of the ECG signal and the power consumption formulas are highlighted. Challenges and future perspectives are also reported. The paper concludes that such mass-market health monitoring systems will only be prevalent when implemented together with home environmental monitoring and control systems.

show abstract

“…Wearable sensors generally use batteries as a power source. Battery technology is very mature, and various power management strategies for prolonging battery life have been proposed [ 15 ]. However, the use of batteries to power wearable sensors is associated with risks such as leakage of toxic substances and limited device lifetimes.…”

Section: Introductionmentioning

confidence: 99%

Energy Solutions for Wearable Sensors: A Review

Rong

Zheng

Sawan

2021

Sensors

View full text Add to dashboard Cite

Wearable sensors have gained popularity over the years since they offer constant and real-time physiological information about the human body. Wearable sensors have been applied in a variety of ways in clinical settings to monitor health conditions. These technologies require energy sources to carry out their projected functionalities. In this paper, we review the main energy sources used to power wearable sensors. These energy sources include batteries, solar cells, biofuel cells, supercapacitors, thermoelectric generators, piezoelectric and triboelectric generators, and radio frequency (RF) energy harvesters. Additionally, we discuss wireless power transfer and some hybrids of the above technologies. The advantages and drawbacks of each technology are considered along with the system components and attributes that make these devices function effectively. The objective of this review is to inform researchers about the latest developments in this field and present future research opportunities.

show abstract

Experimental validation of the recovery effect in batteries for wearable sensors and healthcare devices discovering the existence of hidden time constants

Cited by 13 publications

References 17 publications

Sensitive magnetometry reveals inhomogeneities in charge storage and weak transient internal currents in Li-ion cells

Sensitive magnetometry reveals inhomogeneities in charge storage and weak transient internal currents in Li-ion cells

Developing residential wireless sensor networks for ECG healthcare monitoring

Energy Solutions for Wearable Sensors: A Review

Contact Info

Product

Resources

About