What Is Battery Management System?
BMS testing is a group of tests that verify the battery management system correctly detects overcharge, overdischarge, overcurrent and temperature limits, and gives its protective responses in a timely manner.
Purpose of Battery Management System
The purpose is to demonstrate that the software and hardware protection functions ensuring the safety of the battery pack operate as designed.
Which Products Is Battery Management System Applied To?
- Electric vehicle battery management systems
- Energy storage BMS units
- Industrial battery management boards
In Which Sectors Is Battery Management System Used?
Standards Related to Battery Management System
- ISO 6469-1
- UNECE R100electric vehicle and battery safety test
- UL 2580Safety in electric vehicle batteries test
- IEC 62619lithium battery safety in industrial applications test
- ISO 26262 (functional safety)
- UN 38.3Transport safety tests on lithium batteries test
- IEC 62133Safety in portable cells and batteries test
- IEC 62620industrial lithium cells and batteries test
- UL 1642safety in lithium cells test
- UL 2054Safety in home and commercial use batteries test
- ISO 12405Test conditions for electric vehicle lithium battery packs test
Battery Management System Conditions
- Protection thresholds
- Voltage, current and temperature limits declared by the manufacturer
- Communication
- Command and data verification via CAN or an equivalent interface
- Fault injection
- Sensor disconnection, short circuit and loss-of-communication scenarios
- Environment
- Temperature range defined in the specification
Equipment for Battery Management System
- Cell emulator (battery simulator)
- Programmable power supply and load
- CAN analyser and data logging
- temperature cabinet
- Fault-injection rig
Sample Requirements for Battery Management System
- The BMS software version must be recorded
- Declared protection thresholds must be provided in writing
- Communication protocol documentation is required
- Whether a cell emulator or real cells are used must be stated separately
Duration of Battery Management System
It takes several days, depending on the scope of the protection functions and fault scenarios.
Battery Management System Procedure
- 1The BMS is connected, communication is verified, and the initial condition is recorded.
- 2Voltage and temperature scenarios are created using the cell emulator.
- 3Each protection threshold is exceeded individually and the response time is measured.
- 4Fault-injection scenarios are applied.
- 5The balancing function is verified.
- 6All responses are compared with the communication records.
Battery Management System Acceptance Criteria
The acceptance criterion is defined in the specification: the protection functions activating at the declared thresholds and within the specified time, and transitioning to a safe state under fault conditions.
Evaluation of Results
Response times and threshold accuracies are compared with the measured values. Communication records must show that protection events are reported correctly.
Battery Management System Report
- Applied standard and BMS software version
- Declared and measured protection thresholds
- Response times
- Fault-injection scenarios and results
- Communication records
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
- UNECE R100 Part II
- ISO 6469-1
- EU Battery Regulation
Batarya Testleri — What Does This Testing Field Cover?
The section below describes the field that the Battery Management System 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 Battery Management System
Is BMS testing done with real cells?
A cell emulator is often used to safely exceed protection thresholds. Validation with real cells is done at the pack level and with limited scenarios.