{ "publisher": "Battery Firebreak", "licence": "CC-BY-4.0", "licence_url": "https://creativecommons.org/licenses/by/4.0/", "attribution": "Cite as \"Battery Firebreak (https://batteryfirebreak.com)\" and link the page used.", "contact": "office@batteryfirebreak.com", "methodology": "https://batteryfirebreak.com/methodology/", "changelog": "https://batteryfirebreak.com/changelog/", "generated": "2026-11-15", "dataset": "guides", "items": [ { "id": "aerogel-vs-mica-vs-ceramic-fibre", "lang": "en", "title": "Aerogel vs mica vs ceramic fibre: choosing a cell-to-cell thermal barrier", "summary": "A practical comparison of aerogel, mica and ceramic-fibre barriers for lithium-ion packs: insulation at temperature, compression, dielectric strength, burn-through resistance and cost, with a selection checklist.", "updated": "2026-11-15", "url": "https://batteryfirebreak.com/guides/aerogel-vs-mica-vs-ceramic-fibre/", "markdown_url": "https://batteryfirebreak.com/guides/aerogel-vs-mica-vs-ceramic-fibre.md", "faq": [ { "q": "Is aerogel better than mica for thermal runaway protection?", "a": "For blocking heat conduction between cells, yes: aerogel's thermal conductivity is roughly ten times lower. For resisting flame, particle jets and high voltage, mica is better. That is why many production barriers laminate an aerogel core with mica facings." }, { "q": "How thick should a cell-to-cell barrier be?", "a": "Typical production barriers are 1–3 mm for aerogel or composite pads between prismatic or pouch cells, and 0.2–1 mm for mica sheets. The required thickness depends on cell chemistry, capacity, the trigger method in your target standard and how much compression the barrier sees over life, so it has to be confirmed by a propagation test." }, { "q": "Can I use a phase-change material as a thermal runaway barrier?", "a": "Not on its own. PCMs absorb heat only while melting, at a few tens of °C, and organic PCMs are flammable. They help with normal temperature management, not with stopping propagation." } ] }, { "id": "cell-swelling-and-barrier-compression", "lang": "en", "title": "Cell swelling and cell-to-cell barriers: what the compression data tell you", "summary": "How cell growth loads a thermal barrier between prismatic or pouch cells, with compression and thermal-conductivity data from published datasheets and a method for checking a barrier from beginning to end of life.", "updated": "2026-11-16", "url": "https://batteryfirebreak.com/guides/cell-swelling-and-barrier-compression/", "markdown_url": "https://batteryfirebreak.com/guides/cell-swelling-and-barrier-compression.md", "faq": [ { "q": "Why does cell swelling matter for a thermal barrier?", "a": "A barrier between prismatic or pouch cells sits in the mechanical load path of the cell stack. As the cells grow over life, the barrier is compressed. That changes the stack pressure on the cells and reduces the barrier's thickness, and therefore its thermal resistance, at the time a thermal runaway might occur." }, { "q": "What compression data should I ask a barrier supplier for?", "a": "The compression-force deflection curve with its test method and cycle number, compressive stress relaxation at temperature, compression set, and thermal conductivity or a propagation result at the compressed thickness expected at end of life. A single stress value at one deflection is not enough." }, { "q": "Is a stiffer barrier better?", "a": "Not in general. A stiff barrier keeps its thickness but turns cell growth into stack pressure and end-plate load. A compliant barrier keeps pressure low but loses thickness. Many packs combine a thin, stiff insulating layer with a compliant layer that takes up cell growth." } ] }, { "id": "thermal-runaway-propagation-explained", "lang": "en", "title": "Thermal runaway propagation explained: how one cell ignites the next, and how barriers stop it", "summary": "How lithium-ion thermal runaway starts, the three routes by which it spreads from cell to cell, and the four jobs a cell-to-cell thermal barrier has to do.", "updated": "2026-11-15", "url": "https://batteryfirebreak.com/guides/thermal-runaway-propagation-explained/", "markdown_url": "https://batteryfirebreak.com/guides/thermal-runaway-propagation-explained.md", "faq": [ { "q": "What is the difference between thermal runaway and thermal propagation?", "a": "Thermal runaway is the self-heating failure of a single cell. Thermal propagation is the spread of that failure to neighbouring cells, modules or racks. Barriers cannot prevent the first; they are there to stop the second." }, { "q": "Can a thermal barrier stop a cell from going into thermal runaway?", "a": "No. Barriers slow heat transfer to the neighbouring cells so that those cells stay below their own runaway onset temperature. The failing cell itself will still vent and heat up." }, { "q": "Why do LFP and NMC cells need different barrier designs?", "a": "NMC and other nickel-rich cells usually reach higher peak temperatures and release heat faster than LFP cells, so they demand barriers with lower high-temperature thermal conductivity and better resistance to flame and particle jets. LFP cells release large volumes of flammable gas, so gas management matters as much as heat blocking." } ] }, { "id": "aerogel-vs-mica-vs-ceramic-fibre", "lang": "zh", "title": "气凝胶、云母与陶瓷纤维纸：电芯间隔热层的选型对比", "summary": "面向锂离子电池包的气凝胶、云母与陶瓷纤维纸隔热层工程对比：涵盖高温隔热性能、压缩特性、介电强度、耐烧穿能力与成本，并附选型核查清单。", "updated": "2026-11-15", "url": "https://batteryfirebreak.com/zh/guides/aerogel-vs-mica-vs-ceramic-fibre/", "markdown_url": "https://batteryfirebreak.com/zh/guides/aerogel-vs-mica-vs-ceramic-fibre.md", "faq": [ { "q": "在热失控防护方面，气凝胶是否优于云母？", "a": "在阻断电芯间热传导方面确实如此：气凝胶的导热系数约为云母的十分之一。但在抵御火焰、颗粒喷射流和高电压方面，云母表现更优。因此，许多量产隔热垫采用气凝胶芯材与云母面层复合的层压结构。" }, { "q": "电芯间隔热垫的厚度通常需要多少？", "a": "在量产应用中，方形或软包电芯之间的气凝胶或复合隔热垫厚度通常为 1–3 mm，云母片厚度通常为 0.2–1 mm。所需厚度取决于电芯化学体系、容量、目标标准中的触发方式以及全生命周期内隔热垫承受的压缩量，因此必须通过热扩散试验进行确认。" }, { "q": "相变材料能否单独用作热失控隔热层？", "a": "不能单独使用。相变材料（PCM）仅在几十 °C 的熔化过程中吸收热量，且有机相变材料具有可燃性。这类材料仅有助于常规温度管理，无法用于阻断热扩散。" } ] }, { "id": "cell-swelling-and-barrier-compression", "lang": "zh", "title": "电芯膨胀与电芯间隔热垫：压缩数据说明了什么", "summary": "电芯膨胀如何给方形或软包电芯之间的隔热垫加载；附公开参数表中的压缩与导热数据，以及一套从寿命初期到末期核查隔热垫的方法。", "updated": "2026-11-16", "url": "https://batteryfirebreak.com/zh/guides/cell-swelling-and-barrier-compression/", "markdown_url": "https://batteryfirebreak.com/zh/guides/cell-swelling-and-barrier-compression.md", "faq": [ { "q": "为什么电芯膨胀会影响隔热垫？", "a": "方形或软包电芯之间的隔热垫处在电芯堆叠的受力路径上。电芯在寿命期内变厚，隔热垫随之被压缩，这既改变电芯承受的堆叠压力，也会减小隔热垫的厚度，从而降低热失控发生时它能提供的热阻。" }, { "q": "应该向隔热垫供应商索要哪些压缩数据？", "a": "压缩力-变形曲线（注明测试方法和循环次数）、在使用温度下的压缩应力松弛、压缩永久变形，以及在寿命末期预计压缩厚度下的导热系数或热扩散试验结果。只给一个变形量下的单一应力值是不够的。" }, { "q": "隔热垫越硬越好吗？", "a": "不一定。硬的隔热垫能保住厚度，但会把电芯膨胀转化为堆叠压力和端板载荷；软的隔热垫能把压力控制得低，却会损失厚度。许多电池包采用一层薄而硬的隔热层，加一层吸收电芯膨胀的柔性层。" } ] }, { "id": "thermal-runaway-propagation-explained", "lang": "zh", "title": "热失控与热扩散机理详解：单颗电芯如何引燃相邻电芯，以及隔热层如何阻断扩散", "summary": "解析锂离子电池热失控的触发过程、电芯间热扩散的三条传递路径，以及电芯间热扩散隔热垫必须承担的四项核心功能。", "updated": "2026-11-15", "url": "https://batteryfirebreak.com/zh/guides/thermal-runaway-propagation-explained/", "markdown_url": "https://batteryfirebreak.com/zh/guides/thermal-runaway-propagation-explained.md", "faq": [ { "q": "热失控与热扩散有什么区别？", "a": "热失控是指单颗电芯发生自发热失效的过程；热扩散则是指该失效进一步蔓延至相邻电芯、模组或电池簇的过程。隔热层无法阻止单颗电芯发生热失控，其作用是阻断热扩散。" }, { "q": "隔热层能否阻止电芯进入热失控状态？", "a": "不能。隔热层的作用是延缓热量向相邻电芯传递，使相邻电芯的温度维持在其热失控起始温度以下。发生故障的电芯本身仍会正常泄压并升温。" }, { "q": "为什么 LFP 电芯与 NMC 电芯需要不同的隔热层设计？", "a": "NMC 等高镍电芯在热失控时通常达到更高的峰值温度，且释热速率快于 LFP 电芯，因此要求隔热层具备更低的高温导热系数以及更优异的耐火焰和耐颗粒喷射冲刷性能。LFP 电芯则会释放大量可燃气体，因此在阻隔热量的同时，排气管理同样关键。" } ] } ] }