What Is Cell Tests?
Cell tests are the group of tests that evaluate the performance, life and safety behaviour of the cell, the smallest electrochemical unit of a battery system. They form the basis for module and pack tests.
Purpose of Cell Tests
The purpose is to verify that the cell meets its declared electrical characteristics and behaves safely under abuse conditions, and to provide data for higher-level design.
Which Products Is Cell Tests Applied To?
- Cylindrical lithium-ion cells
- Prismatic cells
- Pouch cells
- Lithium polymer cells
- Industrial storage cells
In Which Sectors Is Cell Tests Used?
Standards Related to Cell Tests
- IEC 62133-2Safety in portable lithium cells and batteries test
- IEC 62619lithium battery safety in industrial applications test
- IEC 62620industrial lithium cells and batteries test
- UN 38.3Transport safety tests on lithium batteries test
- UL 1642safety in lithium cells test
- UL 2580Safety in electric vehicle batteries test
- IEC 62133Safety in portable cells and batteries test
- UL 2054Safety in home and commercial use batteries test
- ISO 12405Test conditions for electric vehicle lithium battery packs test
- UNECE R100electric vehicle and battery safety test
Cell Tests Conditions
- Charging method
- CC-CV parameters declared by the manufacturer
- Reference temperature
- Ambient temperature defined in the standard
- Voltage limits
- Upper and lower cut-off voltage declared by the manufacturer
- Safety measure
- Abuse tests are carried out in an explosion-protected chamber
Equipment for Cell Tests
- Battery test channels (cycler)
- Temperature chambers
- Explosion-protected test cell and gas venting
- Multi-channel temperature and voltage recording
Sample Requirements for Cell Tests
- The number of specimens is determined by the applicable standard
- The manufacturer's charge/discharge limit values must be provided in writing
- Cells must complete the rest period required by the standard before testing
- A safety data sheet (SDS) is required
Duration of Cell Tests
Performance tests can take days, and life tests can take months. Safety tests are generally completed within a few days.
Cell Tests Procedure
- 1The cell is identified and its declared values are recorded.
- 2The initial capacity and internal resistance are measured by charge–discharge.
- 3The performance tests required by the standard are applied.
- 4Safety and abuse tests are carried out with separate specimens.
- 5Voltage, current, temperature and observations are recorded in every test.
Cell Tests Acceptance Criteria
Acceptance criteria are defined in the applied standard. Typical criteria in safety tests are the absence of fire, explosion and leakage; in performance tests, compliance with declared values is required.
Evaluation of Results
Results are evaluated per specimen and as a set. Cell-level results cannot be directly generalised to the pack level; separate verification is required for the higher level.
Cell Tests Report
- Applied standard and revision
- Cell identification, chemistry and declared values
- List of applied tests and parameters
- Voltage, current and temperature records
- Observations and photographs
Accreditation
EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.
Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.
Scope and authorisationsRelated Regulations
- UN 38.3 (transport)
- EU Battery Regulation
- UNECE R100 (vehicle application)
Batarya Testleri — What Does This Testing Field Cover?
The section below describes the field that the Cell Tests test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.
Battery testing answers three separate questions, each with its own body of standards: can the battery be transported, is it safe in use, does it deliver the declared performance? These three questions are often confused with one another, and the confusion has commercial consequences — a market cannot be entered with a transport report, and a shipment cannot be made with a product safety report.
On the transport side, UN 38.3 is a mandatory gate; a battery without that evidence cannot be shipped. On the safety side the application determines what applies: IEC 62133-2 for portable products, IEC 62619 and IEC 63056 for industrial and energy storage applications, UNECE R100, UL 2580 and ISO 6469 for electric vehicles. On the performance side, capacity, internal resistance, cycle life, self-discharge, charge acceptance and temperature-dependent behaviour are measured.
The distinction of LEVEL is essential in this family and is the subject that causes the most argument in the supply chain. Cell, module and pack are assessed separately; a certificate obtained for a cell does not demonstrate the conformity of the pack. Alongside the cells, the behaviour of the pack is determined by the battery management system, the cooling design, the mechanical structure, the interconnection arrangement and insulation coordination. Putting the cell supplier's report into the pack file is a common but inadequate approach.
Thermal runaway and its propagation are the most critical subject in the field. A lithium cell may enter a self-sustaining chemical reaction when damaged or overheated; at that point removing the heat from outside is usually not possible. Modern standards therefore treat thermal runaway of a single cell as an UNAVOIDABLE fault scenario and change the question: does the event propagate to neighbouring cells, what does it release outside the pack, and how much time is left for the user to escape?
In this field the battery management system is assessed not as an electronic board but as a SAFETY FUNCTION. It is shown that overcharge, overdischarge, overcurrent and overtemperature protections actually operate, that the system falls to the safe side in a fault, and that its software has been verified. In industrial and vehicle applications this assessment is tied to functional safety frameworks.
The regulatory side is becoming rapidly more demanding. Battery Regulation (EU) 2023/1542 goes beyond safety and introduces obligations for carbon footprint declaration, recovered content ratio, durability and capacity declaration, the battery passport, and removability for portable batteries. This takes the scope of testing beyond classical safety tests.
Method groups in this field
Electrical abuse
Overcharge, overdischarge, external short circuit, forced discharge and unbalanced charging. This is where it is seen whether the protection circuits actually work.
Mechanical abuse
Vibration, shock, crush, penetration, free fall and tipping. It is monitored whether internal short circuit conditions arise.
Thermal tests
Temperature cycling, thermal shock, high temperature storage, fire exposure and thermal runaway propagation.
Environmental tests
Humidity, low pressure, salt spray and, where required, immersion; these come to the fore in vehicle and outdoor applications.
Performance measurements
Capacity, energy and power, internal resistance, efficiency, cycle life, calendar life and temperature-dependent behaviour.
BMS verification
Verification of protection thresholds, the cell balancing function, communications and fault response.
Commonly confused in this field
- UN 38.3 is not a product safety certificate; it only demonstrates transport conformity.
- A cell certificate does not demonstrate pack conformity. The pack is assessed separately with its own architecture.
- Two packs built from the same cell give different results; cooling, interconnection and mechanical structure are decisive.
- A performance test is not a safety test. A cycle life report does not satisfy safety requirements.
- For an electric vehicle battery, a UL 2580 report and UNECE R100 approval are not the same thing; one is a standards assessment, the other a type approval regime.
- A vehicle battery moved into a second-life application enters a new usage profile; the earlier assessment does not carry over directly.
Which decisions these results support
- Transport conformity and the test summary for shipment
- Product safety declaration and market access
- Performance, durability and carbon footprint declarations under the Battery Regulation
- Assessing the impact of a cell supplier or BMS change
- Site acceptance processes for an energy storage system
Related Tests
Frequently Asked Questions About Cell Tests
If a cell passes testing, is the resulting battery also compliant as a pack?
Not directly. Thermal propagation, BMS behaviour and mechanical protection are evaluated separately at pack level. Cell, module and pack tests therefore do not substitute for one another.