{"id":18033,"date":"2025-09-29T06:36:31","date_gmt":"2025-09-29T04:36:31","guid":{"rendered":"https:\/\/www.tcs-engineering.de\/5-key-topics-in-battery-technology-on-bms-pack-design-ageing-safety-what-engineers-master-electricians-and-cress-need-to-know-about-battery-systems\/"},"modified":"2025-10-19T11:39:49","modified_gmt":"2025-10-19T09:39:49","slug":"5-key-topics-in-battery-technology-on-bms-pack-design-ageing-safety-what-engineers-master-electricians-and-cress-need-to-know-about-battery-systems","status":"publish","type":"post","link":"https:\/\/www.tcs-engineering.de\/en\/5-key-topics-in-battery-technology-on-bms-pack-design-ageing-safety-what-engineers-master-electricians-and-cress-need-to-know-about-battery-systems\/","title":{"rendered":"5 key topics in battery technology on BMS, pack design, ageing &amp; safety &#8211; what engineers, master electricians and CRESs need to know about battery systems"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1352px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p><strong>From SoC\/SoH algorithms and balancing to module topologies and thermals to propagation control &#8211; practical, resilient, without marketing fog<\/strong><\/p>\n<p><strong>Why the system decides &#8211; not the individual cell<\/strong><\/p>\n<p>Performance, range, fast-charging capability, service life and safety are created <strong>in the battery system<\/strong>. Only through the proper interaction of the <strong>battery management system (BMS)<\/strong>, <strong>electrical\/thermal architecture<\/strong>, <strong>mechanical integration<\/strong> and <strong>monitoring\/protection concepts<\/strong> can many cells become a reliable energy storage system for the vehicle, industrial plant or grid. Important in operation: The <strong>thresholds between low voltage (&lt; 60 V)<\/strong> and <strong>low voltage or <a href=\"https:\/\/hochvoltschulung.de\/\" target=\"_blank\" rel=\"noopener\">high voltage (\u2265 60 V DC)<\/a><\/strong> require <strong>different qualifications and training<\/strong> &#8211; both for work on the system and for release and maintenance.  <\/p>\n<p>The following is a technically sound overview of <strong>BMS functionality<\/strong>, <strong>designs\/topologies<\/strong>, <strong>system ageing<\/strong> and <strong>safety<\/strong>, tailored to the work of <strong>electrical engineers, master electricians and chief responsible electrical specialists (CRES).<\/strong><\/p>\n<p><strong>BMS: The brain of the memory &#8211; measuring, deciding, protecting<\/strong><\/p>\n<p><strong>Core tasks &#8211; without them there is no reliable performance<\/strong><\/p>\n<ul>\n<li><strong>Measurement &amp; monitoring:<\/strong> cell voltages (each cell\/group), string\/pack voltage, currents (charging\/discharging), temperatures (cell\/module\/coolant), insulation resistance to vehicle\/system.<\/li>\n<li><strong>Protection logic:<\/strong> limit values for overvoltage, undervoltage, overcurrent (peak\/steady), overtemperature, undertemperature, insulation; time filters\/debouncing; escalation paths from derating to safe shutdown.<\/li>\n<li><strong>Balancing:<\/strong>\n<ul>\n<li><strong>Passive (resistance):<\/strong> robust, cost-effective, thermal to be considered.<\/li>\n<li><strong>Active (capacity redistribution):<\/strong> reduces scattering better, more complex in hardware and control.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Condition estimate:<\/strong>\n<ul>\n<li><strong>SoC (State of Charge):<\/strong> Coulomb counter + OCV mapping; in practice with observers (EKF\/UKF\/particle filter) and temperature compensation.<\/li>\n<li><strong>SoH (State of Health):<\/strong> Derived from capacitance, impedance (DCIR\/EIS proxies), efficiency and aging surrogates.<\/li>\n<li><strong>SoF (State of Function):<\/strong> power-related limit values (instantaneous charging\/discharging power) depending on T, SoC, SoH.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Power path control:<\/strong> pre-charge\/pre-charge sequences (RC time constants), <strong>contactors\/pyro-fuses<\/strong>, DC link management.<\/li>\n<li><strong>Thermal integration:<\/strong> control of pumps\/fans\/valves, heat pump coupling, preconditioning for fast charging and cold operation.<\/li>\n<li><strong>Diagnostics &amp; logging:<\/strong> Error classes, counter readings, event\/data logger &#8211; basis for traceability and root cause analysis.<\/li>\n<\/ul>\n<p><strong>Architectures &#8211; centralized, modular, distributed<\/strong><\/p>\n<ul>\n<li><strong>Centralized:<\/strong> one controller + cell monitoring on one circuit board; suitable for small packs, short cables.<\/li>\n<li><strong>Modular (master\/slave):<\/strong> <strong>BMUs<\/strong> at module level, <strong>CMU\/master<\/strong> coordinated; automotive standard, good scalability.<\/li>\n<li><strong>Distributed (distributed sensing):<\/strong> Measurement ASICs close to cells, robustness against common mode interference, fewer cable harnesses.<br \/>\nCommunication: <strong>CAN\/CAN-FD<\/strong>, <strong>LIN<\/strong>, increasingly <strong>Ethernet backbone<\/strong> in large packs; galvanic isolation and EMC concept are mandatory.<\/li>\n<\/ul>\n<p><strong>Practical toolkit:<\/strong> A BMS is a <strong>protective device, measurement technology and predictor<\/strong> all in one. Without reliable sensors and properly validated models, there can be no reliable release or derating decisions. <\/p>\n<p><strong>Designs &amp; system topologies: From module to pack architecture<\/strong><\/p>\n<p><strong>Serial\/parallel connection &#8211; more than simple mathematics<\/strong><\/p>\n<ul>\n<li><strong>S in series<\/strong> increases voltage, <strong>P in parallel<\/strong> reduces current per cell and internal resistance &#8211; influences <strong>power, losses, cooling requirement<\/strong>.<\/li>\n<li><strong>Layout<\/strong> (e.g. SxPy) determines the number of strings\/modules, backup concept, balancing granularity and fault tolerance in the event of cell\/module failures.<\/li>\n<\/ul>\n<p><strong>Module concepts<\/strong><\/p>\n<ul>\n<li><strong>Single modules:<\/strong> identical cells, one BMU, integrated temperature sensors, integrated cooling channels if necessary.<\/li>\n<li><strong>Smart modules:<\/strong> local computing power for balancing\/diagnostics; reduces master load, increases interchangeability.<\/li>\n<li><strong>Service strategy:<\/strong> access to plugs, venting, mechanical guidance &#8211; what seems trivial in CAD determines replacement times in the field.<\/li>\n<\/ul>\n<p><strong>Pack housing &amp; cooling<\/strong><\/p>\n<ul>\n<li><strong>Housing:<\/strong> aluminum\/steel profiles, extruded parts, composite materials; tightness class (IP protection), vent\/exhaust air paths, EMC shielding.<\/li>\n<li><strong>Cooling:<\/strong>\n<ul>\n<li><strong>Air:<\/strong> simple, cost-effective, limited power density.<\/li>\n<li><strong>Liquid (plates\/extrusion channels):<\/strong> high heat flow, homogeneous temperature, ready for fast charging.<\/li>\n<li><strong>Direct refrigerant cooling:<\/strong> compact, very effective, higher integration requirements.<\/li>\n<li><strong>Immersion cooling (dielectric):<\/strong> excellent homogeneity\/propagation control, requires special media\/material compatibility.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Electrics &amp; protection<\/strong><\/p>\n<ul>\n<li><strong>HVIL (High Voltage Interlock Loop):<\/strong> Manipulation\/disconnection point detection.<\/li>\n<li><strong>Pre-charging resistor &amp; contactors:<\/strong> controlled build-up of the DC link.<\/li>\n<li><strong>Fuses\/pyro-fuses:<\/strong> fast, selective disconnection in the event of fault energy.<\/li>\n<li><strong>Insulation monitoring:<\/strong> continuous measurement against ground; limit value control dynamically adapted to humidity\/temperature.<\/li>\n<\/ul>\n<p><strong>Practical tips:<\/strong> There is no such thing as the &#8220;best&#8221; design. <strong>Requirements \u2192 topology<\/strong>: installation space, performance, thermal, service, costs &#8211; and the desired <strong>fault tolerance<\/strong> in the event of degradation.<\/p>\n<p><strong>System ageing: Why packs age differently than cells in the data sheet<\/strong><\/p>\n<p><strong>Cell-to-cell scattering becomes a system problem<\/strong><\/p>\n<p>Even small differences in capacitance\/impedance lead to <strong>SoC drift<\/strong> within a string. Consequences: <strong>early derating<\/strong>, frequent use of balancing, uneven heat development. <strong>Active balancing<\/strong> reduces drift, but does not replace the need for <strong>homogeneous temperature<\/strong>. <\/p>\n<p><strong>Thermal gradients &amp; edge cells<\/strong><\/p>\n<p>Edge cells see different boundary conditions (cooling, radiation, air gaps) &#8211; the <strong>warm zones<\/strong> age faster (SEI growth, electrolyte\/CEI degradation), drive up impedance and shift performance limits. Design goal: <strong>minimize<\/strong> \u0394T (over area and depth). <\/p>\n<p><strong>Operating strategy shapes service life<\/strong><\/p>\n<ul>\n<li><strong>SoC window:<\/strong> 10-90 % instead of 0-100 % brings noticeably more cycles; for stationary storage systems, possibly even more conservative &#8211; even better 15 % &#8211; 85 %. (Complete discharge would also be extremely damaging) <\/li>\n<li><strong>Performance profiles:<\/strong> Fast charging only within a <strong>thermally conditioned window<\/strong>; cold + high C rates \u2192 risk of Li-plating (irreversible lithium losses, increasing DCIR) &#8211; keep cool is the key battery technology requirement.<\/li>\n<li><strong>Calendar share:<\/strong> High <strong>lying SoC<\/strong> and temperature promote side reactions &#8211; mature strategies &#8220;park&#8221; packs defensively.<\/li>\n<\/ul>\n<p><strong>System signatures of ageing<\/strong><\/p>\n<ul>\n<li><strong>DCIR increase at pack level<\/strong> (not linear to the individual cell due to current distribution).<\/li>\n<li><strong>Increase in balancing energy<\/strong> as a drift indicator.<\/li>\n<li><strong>More frequent limit value events<\/strong> (temperature, cell voltage) \u2192 Derating becomes a &#8220;permanent state&#8221;.<\/li>\n<\/ul>\n<p><strong>Practical rule of thumb:<\/strong> Pack ageing is <strong>dispersion + thermal + strategy<\/strong>. If you have \u0394T, SoC window and fast-charging window under control, you can shift the service life kink significantly to the right. <\/p>\n<p><strong>System security: prevention, detection, limitation<\/strong><\/p>\n<p><strong>Sources of error &amp; triggers<\/strong><\/p>\n<ul>\n<li><strong>Electrical:<\/strong> overcharging, internal\/external short circuit, insulation fault.<\/li>\n<li><strong>Thermal:<\/strong> local hot spots due to contact problems\/high impedance, cooling failure, heat input from outside.<\/li>\n<li><strong>Mechanical:<\/strong> Crash\/vibration, crushing, penetration of foreign bodies; with pouch: swelling + lack of compression.<\/li>\n<li><strong>Chemical:<\/strong> electrolyte\/gas release, transition metal dissolution (inside the cell), moisture ingress.<\/li>\n<\/ul>\n<p><strong>System-side protective measures<\/strong><\/p>\n<ul>\n<li><strong>BMS side:<\/strong> multi-stage limit value monitoring, <strong>derating before switch-off<\/strong>, logic for fail-operational\/fall-back, diagnosis of sensor errors (plausibility check\/multi-channel capability).<\/li>\n<li><strong>Electrical protective elements:<\/strong> pre-charging circuit, fast <strong>pyro-disconnection<\/strong>, selective fuses at module\/string level, <strong>HVIL<\/strong>.<\/li>\n<li><strong>Thermal measures:<\/strong>\n<ul>\n<li><strong>Homogeneous cooling<\/strong> (keep \u0394T small),<\/li>\n<li><strong>Thermal barriers<\/strong> (mica, aerogel, intumescent layers),<\/li>\n<li><strong>Targeted gas\/pressure paths<\/strong> (venting channels, defined blow-off directions),<\/li>\n<li><strong>Detection of early indicators<\/strong> (atypical temperature rises, DCIR jumps, gas\/particle sensors).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Mechanics\/containment:<\/strong> pressure-relieved housing, crash frames, defined load paths; tightness against moisture\/media (IP protection).<\/li>\n<\/ul>\n<p><strong>Mastering propagation<\/strong><\/p>\n<p><strong>Thermal runaway propagation<\/strong> is the system risk. Levers: <g id=\"gid_1\">cell spacing<\/g>, <g id=\"gid_2\">heat conduction paths<\/g>, <g id=\"gid_3\">barriers<\/g>, <g id=\"gid_4\">active cooling<\/g> (also &#8220;after-run&#8221;), <g id=\"gid_5\">rapid electrical separation<\/g> and defined <g id=\"gid_6\">exhaust air routing<\/g>. Tests must show that <strong>cell \u2192 module \u2192 pack<\/strong> does not ignite unchecked &#8211; this is where concept and cosmetics come together.  <\/p>\n<p><strong>Practical toolkit:<\/strong> Security follows the chain <strong>Prevent \u2192 Detect \u2192 Limit<\/strong>. No single component is enough &#8211; only the combination works. <\/p>\n<p><strong>EMC, insulation &amp; leakage issues &#8211; the silent showstoppers<\/strong><\/p>\n<ul>\n<li><strong>EMC\/EMI:<\/strong> DC\/DC converter, pump\/compressor, inverter switching processes &#8211; without proper ground routing, filters and shielding, there is a risk of incorrect measurements in the BMS (ghost faults) and faulty shutdowns.<\/li>\n<li><strong>Insulation resistance:<\/strong> ages due to moisture, dirt, coolant leaks; measurement under varying conditions (temperature\/humidity) necessary.<\/li>\n<li><strong>Coolant compatibility:<\/strong> Conductive or chemically aggressive media are system-critical &#8211; sensor technology + material compatibility are not a &#8220;nice-to-have&#8221;.<\/li>\n<li><strong>Tightness:<\/strong> Realistically check IP protection classes (pressure changes, climatic cycles). Moisture is a fire and ageing accelerator. <\/li>\n<\/ul>\n<p><strong>Operating strategy &amp; BMS algorithms &#8211; performance without regrets<\/strong><\/p>\n<ul>\n<li><strong>Dynamic SoC window:<\/strong> outside temperature, ageing status, load profile \u2192 adaptive window improves service life and availability.<\/li>\n<li><strong>Power enable (SoF):<\/strong> temperature\/impedance\/SoC-dependent; soft limits prevent hard shutdowns and voltage dips.<\/li>\n<li><strong>Preconditioning:<\/strong> Preheating before fast charging (especially at &lt; 10 \u00b0C), if necessary cold operation with reduced C-rates.<\/li>\n<li><strong>Recuperation:<\/strong> limit at high SoC\/low temperature (risk of plating).<\/li>\n<li><strong>Balancing policy:<\/strong> &#8220;Early &amp; often&#8221; reduces drift; active strategies save energy, but are more regulation-intensive.<\/li>\n<\/ul>\n<p><strong>Measurement and diagnostic tools in system operation<\/strong><\/p>\n<ul>\n<li><strong>DCIR tracking<\/strong> (periodic pulse\/current jumps, possible on-board): Early indicator for contact problems, ageing, thermal issues.<\/li>\n<li><strong>EIS-related methods<\/strong> (low-frequency DCR, model-based observers): for fleet operation and predictive maintenance.<\/li>\n<li><strong>dQ\/dV analysis<\/strong> (off-board, laboratory): Deep insight into ageing mechanisms (LLI\/LAM).<\/li>\n<li><strong>Thermography &amp; \u0394T metrics<\/strong> in the pack: visualize cooling quality, identify edge cells.<\/li>\n<\/ul>\n<p><strong>Practical takeaways (compact &amp; practicable)<\/strong><\/p>\n<ul>\n<li><strong>Think BMS first:<\/strong> Protection, measurement, SoC\/SoH\/SoF are the levers for performance <em>and<\/em> service life.<\/li>\n<li><strong>Align topology to requirements:<\/strong> S\/P interconnection, module size, cooling concept, service access &#8211; all system compromises.<\/li>\n<li><strong>Keep \u0394T small:<\/strong> Thermal homogeneity is lifetime protection; fast charging only thermally conditioned.<\/li>\n<li><strong>Actively manage drift:<\/strong> Balancing strategy + dispersion control prevent &#8220;early derating&#8221;.<\/li>\n<li><strong>Safety in layers:<\/strong> BMS limits, electrical separation, barriers, gas\/pressure paths, propagation proofs.<\/li>\n<li><strong>Below 60 V \u2260 (ev) high voltage:<\/strong> voltage limits define qualifications, measuring\/protective equipment and approval processes &#8211; <em>different training requirements are mandatory. <\/em>In the world of battery systems, there is also a 120 V limit, but many safety aspects are standardized for static battery systems starting at 60 V.<\/li>\n<\/ul>\n<p><strong>Conclusion: System excellence is the true battery technology<\/strong><\/p>\n<p>Those who master battery systems orchestrate <strong>cells, BMS, thermals, electrics, mechanics and operation<\/strong> into a coherent whole. The major levers lie in <g id=\"gid_1\">BMS design<\/g>, in <g id=\"gid_2\">pack architectures that are robust in terms of temperature and leakage<\/g>, and in <g id=\"gid_3\">multi-level safety concepts<\/g> against faults and propagation. For <strong>engineers, master electricians and CRESs<\/strong>, only a holistic view delivers <strong>reliable performance, predictable service life and real safety<\/strong> &#8211; in the laboratory, line and field.   Every employee working in battery technology should know the most important key terms such as <strong>battery systems<\/strong>, <strong>BMS<\/strong>, <strong>battery technology<\/strong>, <strong>lithium-ion<\/strong>, <strong>battery production<\/strong>, <strong>safety<\/strong>, <strong>thermal runaway<\/strong>, <strong>balancing<\/strong>, <strong>SoC\/SoH<\/strong>, ( <strong>ev) high voltage<\/strong>, <strong>60 V limit<\/strong>, <strong>cooling concept<\/strong>, <strong>propagation <\/strong>not only from their battery training, but also for their everyday application.<\/p>\n<p><strong>PS: Our recommendation:<\/strong> Our <strong>free<\/strong><strong>(REALLY<\/strong> free, even WITHOUT having to provide an email address!) <a href=\"https:\/\/www.tcs-engineering.de\/en\/basics-of-high-voltage-employee-qualification-offer-de\/\">paper &#8220;6 things you need to know in advance about the high-voltage qualification of your employees&#8221; is available here (click). <\/a> <\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":5,"featured_media":17957,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-18033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unkategorisiert"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Battery systems: BMS, Pack Design, Aging &amp; 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