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Before you test

Every test in the standard sits on top of the same setup. Get these wrong and the result is invalid before you start. The pages in this section cover the conditions, procedures, and tolerances that Sections 6 and 7 require for every test, plus the universal insulation check from Appendix B.

Pages

  • Test environment — temperature, humidity, pressure, instrument accuracy, process error, data recording interval (clauses 6.1.1, 6.2, 6.3, 6.4).
  • Charging procedure — standard charge for cells (7.1.1) and packs/systems (7.2), with the I₁/I₃ definitions (4.1).
  • Pre-treatment cycles — capacity stabilisation cycles for cells (7.1.2) and packs/systems (7.2.2), and what counts as the "actual capacity" (6.1.9).
  • Setting SOC — the default test SOC (6.1.10), the adjustment formula (6.1.7), and the higher SOC required for thermal propagation (Appendix C.5.2 b).
  • Insulation resistance procedure — the pre- and post-test measurement (6.1.5) and the two methods in Appendix B.

Engineering interpretation (non-normative)

The standard sequence for any GB 38031-2025 test, from sample arrival through pass/fail decision.

flowchart LR
    A[Pre-treatment cycles<br/>7.1.2 / 7.2.2] --> B[SOC adjust<br/>6.1.7 / 6.1.10]
    B --> C[Insulation baseline<br/>6.1.5, App. B]
    C --> D[Run test<br/>per 8.x.x]
    D --> E[Observation<br/>at test environment T]
    E --> F[Insulation re-measure<br/>6.1.5, App. B]
    F --> G[Inspect: leakage,<br/>cracks, fire, explosion]
    G --> H{Pass criterion<br/>5.x.x met?}
    H -->|yes| Pass([Pass])
    H -->|no| Fail([Fail])

Where this fits

The per-test pages under tests/ reference these conditions implicitly. If a test page does not override a parameter, the values on these pages apply.

For thresholds and pass/fail criteria, see the cheatsheet all tests at a glance.