Influence of compression on microfiber glass separator and effect of orientation on battery performance

Biagetti, R.V.; Baeringer, I.C.; Chiacchio, F.J.; Cannone, A.G.; Kelley, J. J.; Ockerman, J. B.; Salkind, Alvin J.

doi:10.1109/intlec.1994.396671

Cited by 4 publications

(1 citation statement)

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“…Such a complex 3D porous structure forms a tortuous path for the movement of the electrolyte within an AGM separator. The synergy between the porous structure of AGM separator, constituent fiber dimensions and level of compression forces within the battery play a vital role in mediating the electrolyte uptake [11][12][13]19,24]. Given the fact that the fiber alignment within an AGM separator dictates the 3D pore geometry [15], it is imperative to determine the 3D fiber orientation distribution [21].…”

Section: Resultsmentioning

confidence: 99%

Optimal design of absorptive glass mat (AGM) separator with fastest electrolyte uptake using X-ray micro-computed tomography

Rawal

Rao

Kumar

et al. 2019

Journal of Energy Storage

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Valve regulated lead acid (VRLA) batteries are traditionally classified on the basis of gel and absorptive glass mat (AGM) separators. To fulfill the desired functions of AGM batteries, a key design feature of the separator relies on the uptake of the electrolyte in shortest transport time. Herein, we present a three-dimensional (3D) analytical model to predict the fastest electrolyte uptake in AGM separators based upon the optimal set of fiber and structural parameters. The predictive model has utilized 3D data of fiber orientation in AGM separators, obtained via X-ray micro-computed tomography analysis. Such realistic structural information of AGM has assisted in simulating the separators made up of cheaper coarser glass fibers, which was subsequently benchmarked with the experimental samples consisting of finer fibers for attaining the fastest electrolyte uptake. Through theoretical modeling, a design criterion has successfully evolved for the fastest electrolyte uptake by mapping the key effects of the fiber diameter, 3D fiber orientation distribution and porosity of AGM separators. In general, high-density AGM separators comprising of preferentially aligned coarser fibers tend to attain the fastest electrolyte uptake.

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Section: Resultsmentioning

confidence: 99%

Optimal design of absorptive glass mat (AGM) separator with fastest electrolyte uptake using X-ray micro-computed tomography

Rawal

Rao

Kumar

et al. 2019

Journal of Energy Storage

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Characterization of microglass wet laid nonwovens used as battery separators

Zientek

Bender

Proceedings of 11th Annual Battery Conference on Applications and Advances

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Comments on the evaluation of valve regulated lead-acid batteries (VRLA) under deep cycling regimes

Cannone

Salkind²,

Trumbore³

Thirteenth Annual Battery Conference on Applications and Advances. Proceedings of the Conference

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The evaluation of components, orientation, and materials for recombinant valve regulated lead-acid batteries is a challenging and enlightening task. The selection of an appropriate charging regime is critical to the meaningful evaluation of materials, designs and applications. Included in our studies were measurements of discharge capacity, impedance, weight loss. open circuit voltage after float, effects of stack compression and variations of charging regime. Teardown analysis of cells provided information on electrolyte distribution and concentration. Chemical and thermal analyses of the active materials provided information on sulfation. Electrical testing data highlighted the sensitivity of cycle life performance to even a small mismatch of series connected cells under deep cycling conditions. The results support earlier work indicating the advantages of horizontal oriented cell testing and emphasize the need for closely matched cells for testing of VRLA cells.

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Influence of compression on microfiber glass separator and effect of orientation on battery performance

Cited by 4 publications

References 1 publication

Optimal design of absorptive glass mat (AGM) separator with fastest electrolyte uptake using X-ray micro-computed tomography

Optimal design of absorptive glass mat (AGM) separator with fastest electrolyte uptake using X-ray micro-computed tomography

Characterization of microglass wet laid nonwovens used as battery separators

Comments on the evaluation of valve regulated lead-acid batteries (VRLA) under deep cycling regimes

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