Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
IEC 62619-2017: Secondary Lithium Cells for Industrial Applications – Safety and Performance Requirements
IEC 62619-2017 is the primary international standard governing the safety and performance requirements for secondary lithium cells and batteries used in industrial applications. It complements UN 38.3 (transportation safety) and UL 1973 (stationary storage safety) by focusing specifically on industrial use cases such as forklifts, automated guided vehicles (AGVs), UPS systems, and stationary energy storage.
Scope and Application Domain
IEC 62619 applies to secondary lithium cells and batteries used in industrial applications, excluding electric vehicles (covered by IEC 62660 series) and portable devices (covered by IEC 62133). The standard defines two distinct categories of products: cells (basic electrochemical units) and batteries (assemblies of cells with monitoring and protection circuitry).
Typical applications covered include material handling equipment (forklifts, pallet jacks), automated guided vehicles, buffer power for UPS systems, stationary energy storage systems (ESS), and telecommunications backup power. The standard addresses both the cell-level and battery-level requirements, recognizing that safety cannot be achieved solely at the cell level—the battery management system (BMS) plays an equally critical role.
Designers must note that IEC 62619 does not cover functional safety (IEC 61508) or EMC requirements. These must be addressed separately when designing complete battery systems. Additionally, the 2017 edition does not include requirements for battery system integration with grid-tied inverters, which are covered by IEC 62933 series.
Key Safety Requirements at Cell and Battery Levels
Cell-Level Safety Tests
The standard mandates a comprehensive set of safety tests for individual cells, designed to simulate worst-case abuse scenarios. These include external short circuit, thermal abuse (heating to 130 °C and beyond), overcharge at different current rates, forced discharge (reverse polarity), mechanical crush (applying a force of 13 kN), and drop testing from 1 meter. The pass criterion is unambiguous: no fire, no explosion, and no rupture during or after the test.
| Test | Condition | Pass Criterion | Significance |
|---|---|---|---|
| External Short Circuit | 80 ± 20 mΩ, 25 °C, until stable | No fire, no explosion | Simulates accidental terminal shorting |
| Thermal Abuse | 130 °C ramp at 5 °C/min, hold for 30 min | No fire, no explosion | Simulates external heating or adjacent cell failure |
| Overcharge | 3x recommended current to 200 % SoC | No fire, no explosion | Simulates BMS failure during charging |
| Forced Discharge | 1x rated current to -100 % SoC | No fire, no explosion | Simulates deep discharge with reverse polarity |
| Mechanical Crush | 13 kN force, 100 mm/min | No fire, no explosion | Simulates vehicle impact or dropped load |
| Drop Test | 1 m onto concrete surface | No fire, no explosion | Simulates handling accidents |
A critical observation for engineers: the thermal abuse test at 130 °C is specifically designed to trigger thermal runaway in cells with inadequate separator thermal stability. Polyolefin separators (PE, PP) typically begin shrinking around 130–150 °C, making this test a direct evaluation of separator integrity. Ceramic-coated separators or high-melting-point separators (e.g., PI, aramid) are strongly recommended for industrial cells targeting IEC 62619 compliance.
Battery-Level Safety Requirements
At the battery level, IEC 62619 requires that the battery system include active monitoring and protection features. These include overvoltage protection, undervoltage protection, overcurrent protection, overtemperature protection, and internal short-circuit detection. The BMS must be designed with redundancy for critical safety functions, and the battery must include a means of disconnection (e.g., contactor, circuit breaker) that isolates the battery from external circuits during fault conditions.
The standard also introduces the concept of single-point failure tolerance at the battery level. A single component failure in the protection circuitry must not lead to a hazardous condition. This aligns closely with functional safety principles and requires designers to implement diagnostic coverage for critical sensing elements such as voltage monitoring lines and temperature sensors.
Performance Testing and Characterization
Beyond safety, IEC 62619 specifies performance test procedures to characterize cells and batteries under controlled conditions. The standard defines test methods for nominal capacity measurement at different discharge rates (C/3, 1C, 2C), power and internal resistance measurement using the hybrid pulse power characterization (HPPC) method, and cycle life testing to 80 % retained capacity.
Cold-cranking performance at low temperatures (-20 °C or -10 °C depending on application) is tested for applications requiring cold-start capability. Storage characteristics are evaluated through capacity retention and recovery measurements after specified storage periods at various temperatures and states of charge.
| Parameter | Test Condition | Measurement | Typical Target |
|---|---|---|---|
| Nominal Capacity | C/3 discharge at 25 °C | Ah to terminal voltage limit | ≥ 100 % of rated |
| High-rate Capacity | 1C, 2C discharge at 25 °C | Ah at higher rate | ≥ 95 % at 1C |
| Internal Resistance | DC pulse 1C, 10 s | mΩ (AC 1 kHz optional) | ≤ spec limit |
| Cycle Life | 100 % DoD, 0.5C/0.5C | Cycles to 80 % capacity | ≥ 2000 cycles |
| Cold Cranking | -20 °C, 2C pulse 30 s | Voltage sag | ≥ 2.5 V/cell |
| Storage Retention | 90 days at 25 °C, 50 % SoC | % capacity retained | ≥ 92 % |
Engineering Design Insights
Designing a battery system to meet IEC 62619 requires a holistic approach that integrates cell selection, mechanical design, thermal management, and BMS architecture. Here are key engineering considerations:
Cell Selection Strategy. The choice of cell chemistry (LFP, NMC, LTO) significantly impacts both safety and performance. LFP (LiFePO₄) cells offer superior thermal stability with an onset temperature for thermal runaway above 200 °C, making them easier to qualify for thermal abuse tests. NMC cells provide higher energy density but require more robust thermal management and earlier intervention by the BMS. LTO cells eliminate the risk of lithium plating during fast charging and offer excellent cycle life, though at lower energy density.
BMS Architecture for Industrial Systems. For industrial applications, a distributed BMS architecture with a dedicated cell monitoring IC per module is recommended. Each monitoring IC should provide independent overvoltage, undervoltage, and overtemperature detection with hardware-level fault outputs that bypass the microcontroller. This ensures that even if the main processor fails, the protection FETs or contactors are opened by the dedicated protection hardware. Key monitoring ICs from manufacturers such as Analog Devices (LTC6813), Texas Instruments (BQ79616), and NXP (MC33772) offer ASIL-C/D capable monitoring suitable for industrial safety requirements.
Thermal Runaway Propagation Prevention. IEC 62619 does not explicitly require propagation prevention at the cell level, but good engineering practice and emerging regulations (e.g., UL 9540A, NFPA 855) strongly recommend it. Design strategies include: using aerogel-based thermal barrier sheets between cells (3–5 mm thickness), designing cell-to-cell spacing of at least 2 mm with phase-change material (PCM) fill, and incorporating a dedicated vent path that channels hot gases away from adjacent cells. Simulation studies show that aerogel barriers can delay thermal propagation by 15–30 minutes, providing critical time for emergency response.
When designing the cell holder and busbar assembly, consider using nickel-plated copper busbars with a cross-sectional area sized for at least 1.5x the maximum expected continuous current. The weld joint between the busbar and the cell terminal should be verified through pull-testing with a minimum strength of 100 N for prismatic cells and 50 N for cylindrical cells. This ensures mechanical integrity under vibration and thermal cycling over the battery’s service life.
Relationship with Other Standards
IEC 62619 does not exist in isolation. It is part of a broader ecosystem of lithium battery standards. For transportation safety, UN 38.3 (Manual of Tests and Criteria, Section 38.3) covers the safe transport of lithium cells and batteries, including altitude simulation, thermal cycling, vibration, shock, external short circuit, impact, and overcharge tests. For stationary energy storage, UL 1973 is widely used in North America alongside IEC 62619. For electric vehicle traction batteries, IEC 62660 series covers performance and safety testing. The relationship is complementary: many manufacturers qualify cells simultaneously to IEC 62619, IEC 62660, and UN 38.3 to address multiple market segments with a single cell design.
| Standard | Scope | Key Difference from IEC 62619 |
|---|---|---|
| UL 1973 | Stationary storage safety | Requires thermal runaway propagation test, more stringent enclosure requirements |
| IEC 62660 | EV traction batteries | Focus on vibration, shock, and cycle life under driving profiles |
| UN 38.3 | Transportation safety | Altitude, vibration, shock during transport; does not cover industrial installation |
| IEC 62133 | Portable devices | Lower energy cells (≤ 100 Wh), different abuse test conditions |
| IEC 62933 | Grid-connected ESS | System-level integration, grid interface, and functional safety |
Frequently Asked Questions
Q1: Does IEC 62619 certification guarantee that a battery system is safe under all operating conditions?
No. IEC 62619 certification demonstrates compliance with a specific set of safety tests under controlled laboratory conditions. Real-world safety depends on proper system integration, appropriate BMS settings, correct installation, and adherence to manufacturer guidelines for charging, discharging, and operating temperature ranges. The standard is a necessary but not sufficient condition for overall system safety.
Q2: Can I use cells qualified to IEC 62619 in an electric vehicle application?
While the cells may physically function in an EV, IEC 62619 does not cover EV-specific requirements such as vibration profiles typical of automotive use, salt-spray corrosion, or crash safety. For EV traction batteries, use cells qualified to IEC 62660-1 (performance) and IEC 62660-2 (reliability) or IEC 62660-3 (safety) instead.
Q3: What is the difference between Type A and Type B batteries in industrial applications?
IEC 62619 defines Type A as non-separable batteries (e.g., a plastic-encased pack) and Type B as separable batteries (e.g., a rack-mounted cabinet system). Type B batteries require additional insulation coordination and creepage/clearance distances because the terminals are accessible during installation and maintenance.
Q4: How often should periodic verification testing be performed for IEC 62619 compliance?
IEC 62619 does not prescribe a specific retesting interval. However, any significant design change (cell chemistry change, separator change, BMS hardware change, or manufacturing process change) requires re-qualification. Most manufacturers perform full re-qualification every 2–3 years or when a major cell design revision occurs.
