Life Testing of COTS Cells for Optimum Battery Sizing

Buckle, Rachel

doi:10.1109/espc.2019.8932029

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…For this experiment, a 3X accelerated LEO cycle of 30 min (1800 s) was used to expedite testing while ensuring cells were cycled within limits of manufacturer charge/discharge rates. We note that this test acceleration increases the electrical current, which will lead to greater heat loss and raise the cell temperature to some extent, but the impact on degradation is expected to be low [28]. The LEO cycle begins with a 700 s CP discharge (33.6 W; 11.2 W/cell) followed by 1100 s of sinusoidal power charge profile to imitate a fixed photovoltaic array orbiting Earth peaking at 33.6 W (11.2 W/cell).…”

Section: Test Schedulementioning

confidence: 99%

Impact of Test Conditions While Screening Lithium-Ion Batteries for Capacity Degradation in Low Earth Orbit CubeSat Space Applications

2021

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A wide variety of commercial cylindrical lithium-ion batteries are available for use in nanosatellites (CubeSats) that cycle in low Earth orbit (LEO). This space application differs greatly from the conditions used to create the manufacturer datasheets that CubeSat teams rely on to screen cell types and estimate performance lifetimes. To address this, we experimentally test three LIB cell types using a representative LEO CubeSat power profile in three progressively complex test representations of LEO. The first is “standardized” condition (101 kPa-abs, 20 °C), which uses only a power cycler; the second adds a thermal chamber for “low temperature” condition (101 kPa-abs, 10 °C); and the third adds a vacuum chamber for “LEO” condition (0.2 kPa-abs, 10 °C). Results indicate that general “standardized” and “low temperature” conditions do not yield representative results to what would occur in LEO. Coincidentally, the “LEO” condition gives similar capacity degradation results as manufacturer datasheets. This was an unexpected finding, but suggests that CubeSat teams use full experimental thermal-vacuum testing or default to the manufacturer datasheet performance estimates during the lithium-ion cell screening and selection process. The use of a partial representation of the LEO condition is not recommended.

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Section: Test Schedulementioning

confidence: 99%

Impact of Test Conditions While Screening Lithium-Ion Batteries for Capacity Degradation in Low Earth Orbit CubeSat Space Applications

2021

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“…Minmax normalization can process all features at the same scale; however, it has the disadvantage of being sensitive to outliers. In this study, because outliers are eliminated by the IQR method, all features are normalized using the min-max method, as shown in Equation (13).…”

Section: Preprocessing For Bi-lstm Network Trainingmentioning

confidence: 99%

Forecasting Methods of Battery Charge and Discharge Current Profile for LEO Satellites

Yun

Kong

2021

Electronics

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The orbital characteristics of low Earth orbit (LEO) satellite systems prevent continuous monitoring because ground access time is limited. For this reason, the development of simulators for predicting satellite states for the entire orbit is required. Power-related prediction is one of the important LEO satellite simulations because it is directly related to the lifespan and mission of the satellite. Accurate predictions of the charge and discharge current of a power system’s battery are essential for fault management design, mission design, and expansion of LEO satellites. However, it is difficult to accurately predict the battery power demand and charging of LEO satellites because they have nonlinear characteristics that depend on the satellite’s attitude, season, orbit, mission, and operating period. Therefore, this paper proposes a novel battery charge and discharge current prediction technique using the bidirectional long short-term memory (Bi-LSTM) model for the development of a LEO satellite power simulator. The prediction performance is demonstrated by applying the proposed technique to the KOM-SAT-3A and KOMSAT-5 satellites operating in real orbits. As a result, the prediction accuracy of the proposed Bi-LSTM shows root mean square error (RMSE) within 2.3 A, and the prediction error well outperforms the most recent the probability-based SARIMA model.

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“…The longest eclipse represent also the deepest discharge that the battery will experience and it is often designed to be 60-80% cycle DOD. The wide study was performed on COTS Li-ion cells lifetime for LEO and GEO missions by ABSL [49,65,66]. It was shown that the battery lifetime depends on many factors and it varies for different cells.…”

Section: Mission Requirements On Batteriesmentioning

confidence: 99%

A Review of Battery Technology in CubeSats and Small Satellite Solutions

2020

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CubeSats and small satellite solutions are increasing in popularity as they enable a fast, cheap, and agile way for satellite applications. An essential component of nearly every satellite is the energy storage device, which is practically equal to a battery. Consequently, an overview of past, present, and future battery technologies for CubeSats is presented. CubeSats use typically commercial off-the-shelf (COTS) batteries. They are not primarily dedicated to space, so their suitability to the space environment needs to be evaluated. Batteries are also considered as potentially dangerous goods. Thus, there are guidelines and standards that specify safety criteria and tests for the batteries in order to be allowed for transportation and launch. Furthermore, the character of satellites’ missions determines their demand on batteries in terms of current rates, depth-of-discharge, and lifetime. Thus, these expectations are discussed. A market survey was also carried out to identify currently available commercial battery solutions and their parameters. This work summarizes the status, requirements, and the market situation of batteries for CubeSats.

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Life Testing of COTS Cells for Optimum Battery Sizing

Cited by 3 publications

References 2 publications

Impact of Test Conditions While Screening Lithium-Ion Batteries for Capacity Degradation in Low Earth Orbit CubeSat Space Applications

Impact of Test Conditions While Screening Lithium-Ion Batteries for Capacity Degradation in Low Earth Orbit CubeSat Space Applications

Forecasting Methods of Battery Charge and Discharge Current Profile for LEO Satellites

A Review of Battery Technology in CubeSats and Small Satellite Solutions

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