Lithium Battery Failure Analysis — Preserve Evidence Before Teardown
A failed lithium battery needs a safe evidence-preservation plan before it needs a list of analytical tests. Heat damage, contamination, external loading and protection-system behaviour can produce overlapping symptoms; investigation should distinguish observations from a supported causal conclusion.
Preserve the event record and original condition
Collect operating logs, charge history, fault codes, protection settings and photographs without energizing or opening a damaged unit. Record when swelling, venting, heating or loss of function first appeared and how the battery was handled afterwards. Failure location can differ from the initiating defect after propagation. Ask the specialist what evidence can be collected safely on site and how potentially unstable specimens must be isolated, packed and transported.
Stage non-destructive and destructive work
External examination, electrical records and suitably selected imaging may guide sampling before a controlled teardown. Cross-sections, SEM/EDS, chemical analysis or thermal measurements answer specific hypotheses rather than providing an automatic root cause. Teardown can alter electrolyte, surfaces and fracture evidence; agree atmosphere, contamination controls, retained material and chain of custody. Include an unaffected unit or representative lot where it is available and safe to supply.
Distinguish a finding from a mechanism
A metal particle, damaged separator or burned connector is an observation. Establishing initiation requires its position, morphology and chemistry to be considered alongside electrical and thermal history. Request a report that separates confirmed facts, alternative explanations and unresolved limitations. A diagnostic investigation does not replace transport testing, product safety qualification or fire-propagation evaluation. Any reproduction experiment should be separately risk assessed and defined, not attempted by the buyer.
Select an investigator with safe capacity
Confirm chemistry and energy limits, damaged-battery acceptance, emergency arrangements and permission for destructive work. Ask who interprets the combined electrical, physical and chemical evidence and whether subcontracted tests retain specimen traceability. For insurance, legal or customer disputes, agree witness requirements and evidence retention before opening the battery. The RFQ should identify the decision to be made without asserting an unproven cause.
Sample considerations
- Provide chemistry, energy, cell/pack identifiers, enclosure drawings and event chronology.
- Identify damaged/unstable condition and any previous opening, cleaning or discharge; do not ship without the specialist's agreement.
- Offer logs, photographs and unaffected comparisons; define retention, witness and confidentiality requirements.
Questions to ask a laboratory
- Can your site safely accept this damaged configuration and preserve it before teardown?
- Which methods discriminate our hypotheses, and which steps irreversibly alter evidence?
- Will the report distinguish observations, supported cause and unresolved alternatives?
Laboratories with relevant capabilities
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Sources and scope references
UNECE — Manual of Tests and Criteria, revision 8 and amendments
Related testing briefs
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