With the rapid iteration of portable electronic devices, the safety performance of lithium-ion batteries has become a global priority. As the primary international safety standard for sealed portable lithium batteries, IEC 62133-2:2017 serves as the foundation for obtaining IECEE CB certificates, which can be further converted into KC, CE and other regional certifications to access multiple global markets efficiently.

1. In-depth Interpretation of IEC 62133-2:2017

Full Standard Title

Secondary cells and batteries containing alkaline or other non-acid electrolytes — Safety requirements for secondary lithium cells and batteries for use in portable applications — Part 2: Lithium systems

Scope of Application

• Small lithium cells and battery packs for portable electronic devices
• Consumer lithium batteries: Mobile phone batteries, laptop batteries, drone battery packs, earphone batteries, etc.
• Exclusion: Batteries for industrial use (governed by IEC 62619:2022)

Comparison with Corresponding Regional Standards

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2. Link between IECEE CB Scheme and IEC 62133-2:2017

Operated by the International Electrotechnical Commission for Electrotechnical Equipment Testing and Certification (IECEE), the CB Scheme is one of the world’s most widely recognized international certification systems for electrical products.

Products certified to IEC 62133-2:2017 with a valid CB certificate can undergo conversion to local certifications in IECEE member states, drastically cutting costs caused by repeated full testing for new market entry.

Common CB Conversion Examples

• CB → KC (South Korea): Only supplementary tests for Korean national deviations are required
• CB → CE (EU): Additional EMC testing is mandatory for radio frequency compliance
• CB → PSE (Japan): Reuse most test data to shorten the cycle by 30%–50%
• CB → NOM (Mexico): Direct adoption of existing test reports

3. Core Test Items of IEC 62133-2:2017

Tests are divided into two categories: single cell tests and battery pack tests.

Single Cell Tests

• Continuous low-rate overcharge: Verify internal short-circuit protection performance
• Forced discharge: Simulate over-discharge by applying reverse current via external power supply
• External short circuit (fully charged): Short circuit with internal resistance below 0.1Ω; monitor surface temperature
• External short circuit (non-charged state): Evaluate safety under low state of charge
• Charge and discharge cycling: Assess capacity retention, electrolyte stability and internal resistance growth

Battery Pack Tests

• Continuous charging: Simulate overcharge conditions to verify reliability of protective components
• Vibration test (per IEC 60068-2-64): Simulate vibration during transportation
• Mechanical impact test (per IEC 60068-2-27): Verify resistance against mechanical shock and stacking stress
• Elevated temperature storage (70°C): Check sealing performance and long-term safety
• Abnormal charging: Validate overall protection logic for protected battery packs

4. IECEE CB Certification Application Process

Step 1: Select certification body Choose an authorized IECEE testing laboratory (e.g. SGS, TÜV, DEKRA, Intertek). Submit documents including product specifications, circuit diagrams and BOM.

Step 2: Deliver samples for testing Provide 20–40 single cells and 10–20 battery packs. The lab conducts full tests in accordance with IEC 62133-2:2017.

Step 3: Safety component evaluation Assess core safety components including protection IC, MOSFET and PTC to confirm compliance of protection circuits.

Step 4: Issue test reports The laboratory releases formal test reports recording results of all test items.

Step 5: Issue CB certificate Authorized IECEE bodies issue official CB certificates for single cells and battery packs respectively.

Step 6: Convert certificates for target markets Use the CB certificate to apply for KC, CE, PSE and other regional certifications to avoid redundant testing.

Certification Cycle

The standard testing and certification cycle takes 4–8 weeks (excluding sample preparation). The CB certificate is a cost-effective solution for lithium battery manufacturers expanding into multiple overseas markets.

5. Common Test Failures & Solutions

• Failed protection circuit: Mismatched specifications of protection IC or MOSFET. Solution: Conduct pre-simulation of protection circuits; ensure the current limit of protection IC exceeds the maximum discharge current of the cell.
• Excessively high internal resistance: Defective cells or poor design of series-parallel connection. Solution: Strictly screen cell suppliers and optimize cell layout and internal resistance monitoring.
• Overheating during external short circuit: Slow response of short-circuit protection. Solution: Adjust short-circuit protection threshold or add PTC protective layers.
• Failed continuous charging test: Unreasonably high charge cut-off voltage. Solution: Recalculate the threshold based on cell datasheets; the cut-off voltage shall not exceed 105% of the cell’s rated voltage.

6. Frequently Asked Questions (FAQ)

Q1: Differences between IEC 62133-2 and IEC 62133-1? A1: IEC 62133-2:2017 applies to lithium-ion batteries, while IEC 62133-1:2017 covers alkaline batteries such as Ni-MH and Ni-Cd. IEC 62133-2:2017 is the prevailing standard for mainstream lithium-ion batteries.

Q2: Validity period of CB certificates? A2: CB certificates have no fixed expiry date. Re-evaluation is required when the standard is updated, or when product design and key components are modified. Regular recheck every 3–5 years is recommended.

Q3: Is a separate CB certificate required for built-in batteries of end products? A3: It is required if end-product manufacturers need pre-certified batteries to simplify overall product certification. Many enterprises apply for CB certificates for batteries and finished products together to meet diverse client demands.

Q4: Can one CB certificate cover multiple battery models? A4: One certificate corresponds to one independent model in principle. For derivative models with identical materials and structures but different dimensions, some laboratories accept model expansion applications.

Q5: How to choose between IEC 62133-2:2017 and IEC 62619:2022? A5: The two standards apply to different scenarios. IEC 62133-2:2017 targets lithium batteries for portable consumer electronics. IEC 62619:2022 is designed for industrial batteries, energy storage systems and high-capacity portable power stations. Select the standard according to actual application scenarios.

7. Professional Support for IEC 62133-2:2017 CB Certification

Guangdong Energy Storage Testing Technology Co., Ltd. focuses on international certification services for lithium batteries. We provide one-stop support including pre-evaluation, certification route planning, laboratory recommendation and failure analysis, helping clients leverage CB certificates to access multiple global markets smoothly.

Disclaimer This article is AI-assisted for reference only, and does not constitute certification commitment or legal advice. All operations shall comply with the latest official standards and regulations.