ISO/TR 20891-2020 pdf free

04-24-2021 comment

ISO/TR 20891-2020 pdf free.Space systems — Space batteries — Guidelines for in-flight healthassessment of lithium-ion batteries.
This document provides detailed information on the various methods of assessing the health statusof lithium-ion space batteries in flight and makes recommendations to battery suppliers,spacecraftmanufacturers and operators to ease this assessment.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 17546, Space systems — Lithium ion battery for space vehicles —Design and verification requirements
For the purposes of this document, the terms and definitions given in IS0 17546 and the following apply.
battery health:state of the battery, which is healthy if both the amount and the rate of degradation of its performanceare lower than or equal to the predicted ones at the same time into the mission.
The SoH of a battery reflects its capability to fulfil the needs of a mission, i.e. whether the performanceis at or above the expected level.Typically, the performance itself covers requirements such as;
a) the capability to deliver and absorb a certain amount of energy, under a certain load profile and
with a defined voltage range;b) the capability to deliver a certain power for a given duration, while maintaining a certain voltage.Theoretically, assessing this SoH can be conceived as the simply monitoring the battery behaviour (e.g.the battery voltage) in the orbit and comparing it against previously set baselines but, in reality, it is farless straightforward.
As Figure 1 shows, the deliverable energy a) of a battery is dependent on the mission phase andoperational strategy. ln many cases this not only shows characterizing the mission energy profile butalso includes understanding the proportion of contingency energy,i.e.the energy needed to reach a safemode, as part of the recovery of a major on-board failure. There is also some usable energy that willnot be used at the extremes of SoC (to mitigate the accelerated lifetime degradation that occurs withrepeated use of energy in these segment of the SoC window).As energy is not expected to be drawnfrom the contingency or protective margins of the battery in nominal operating conditions, observingenergy in these segments is simply not possible during mission.
Pulsed power profiles in b) may occur for a duration too short to be captured by the telemetry. It isthus necessary to infer the health status from only the observable data, by estimating the value of theparameters driving the battery performance.ISO/TR 20891 pdf download.

Download infomation Go to download
Note: Can you help me share this website on your Facebook or others? Many thanks!
AS ISO ASTM 52904:2021 pdf free Free AS Standards

AS ISO ASTM 52904:2021 pdf free

AS ISO ASTM 52904:2021 pdf free.Additive manufacturing - Process characteristics and performance - Practice for metal powder bed fusion process to meet critical applications. 5 Feedstock and Powder Batches 5.1 The material supplier shall package the powder...
Get More
AS ISO/ASTM 52901:2021 pdf free Free AS Standards

AS ISO/ASTM 52901:2021 pdf free

AS ISO ASTM 52901:2021 pdf free.Additive manufacturing - General principles - Requirements for purchased AM parts. 4.3.3 Tolerances The tolerances shall be specified (e.g. general tolerances, see ISO 2768-1 and ISO 2768-2, and/or specific, ISO 1101), including...
Get More
AS ISO 16809:2020 pdf free Free AS Standards

AS ISO 16809:2020 pdf free

AS ISO 16809:2020 pdf free.Non-destructive testing — Ultrasonic thickness measurement. 5 General requirements 5.1 Instruments The following types of instruments shall be used to achieve thickness measurement: a) dedicated ultrasonic thickness measurement instruments with numerical display showing...
Get More


Anonymous netizen Fill in information