RE:Battery-Electric Surge: ESS Scales Up in Maritime- Aug, 2022.
.....worth reposting from a few days ago........as I have said before, the BCS side has leap frogged CD by 2Q's now and They are SPOT on with the "HEAT" issue.......
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he first phase of UL certification testing is designed to assess an energy storage system's ability to prevent the spread of fire/explosion during a battery cell thermal runaway event.
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The module design underpinning Exro's Cell Driver™ required three times the amount of heat to artificially induce a thermal event, and after more than 10 hours of smouldering any fire was still "too small to detect," all contained within a single battery module.
“Heat” issues.... from article a couple weeks ago......
The BMS is key, as the whole, emerging sector behind marine ESS still wrestles with the causes of perplexing battery fires, or thermal runaway (TR). A battery’s own electro-magnetic interference, or EMI, might be a cause and, if so, then BMS offers some hope of total control while itself having to be immune to EMI.
If cell chemistry is to blame, then BMS might not be enough since, as one expert wrote, “each particle of active material is unique” and might not be totally controllable. So, more stable cell chemistries — the “next-generation”, semi-solid Lithium-Ion cells — offer stability gains over earlier, less viscous chemistries.
While, captaining a battery-powered vessel requires the safe BMS control software, there are, again, different types. An ABB source tells us that many of their battery suppliers have developed their own BMS, and confirms that “This is because each system must be tailored to the Li-I cells used in the system, as well as the specificity of Marine Classes.” BMS tech and each supplier’s software will affect battery control and safety, the ABB source says, adding that “(only some battery) suppliers are working on a preventative detection method to avoid thermal runaway.” Yet, “Each cell (or pair of cells) must be monitored for voltage and temperature, so if the system detects a rise in temperature with some changes in voltage, with the help of a proper software detection algorithm, the battery string in question can be “isolated”. If done early enough you can prevent the TR.”