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MK LIT (E5) 01/2021 page 21/172
2.4.2 Detection and secure inclusion of an event within the battery test chamber by im-
manent safety with a defined load (max. one single 18650 cell with LIT MK 240, max.
three 18650 cells with LIT MK 720)
The maximum energy and gas quantity released by lithium-ion accumulators, the effect of which can be
reduced by containment measures to a level that can be safely tolerated by the battery test chamber, in-
cluding gas disposal via a ventilation flap, must not be exceeded.
Without customer-provided flushing/inertization, the battery test chamber LIT MK 240 can dissipate the
energy of a single 18650 cell (safety factor 3), LIT MK 720 can dissipate the energy of a max. three 18650
cells (safety factor 3),and any amount of gas released will be reliably below the LEL. Consequently, only
a single individual cell (LIT MK 240) / three cells (LIT MK 720) of type 18650 may be inserted in this
case.
The default signal values of the gas sensors are selected such that the maximum possible concentration
of the respective gas until the CO
2
fire suppression device is triggered is safely below the LEL, even in the
event of an event.
In that case, the battery test chamber ensures safe containment in the event of a EUCAR hazard level 4 to
6 event.
2.4.3 Detection and safe inclusion of an event within the battery test chamber by addi-
tional operator-provided measures with a defined load
If the operator tests multiple or larger cells with a larger single or total energy content than that of an indi-
vidual 18650 cell with LIT MK 240 / of three cells with LIT MK 720, the occurrence of larger quantities of
gas and released energy can be expected.
In that case, the battery test chamber will no longer ensure safe containment with standard measures
(intrinsic safety) in the event of a EUCAR hazard levels 4 to 6. For this reason, it is essential that more
stringent safety measures are taken, which are the responsibility of the operator.
In that case, the operator must take enhanced safety precautions. Equipment for the supply of flushing
gas/inert gas is provided by BINDER GmbH. The dosing or expansion of this equipment is the responsibility
of the operator. The operator is responsible for providing and controlling inertization with inert gas. The O
2
detection switching thresholds for releasing a higher-level control system are defined by the operator.
At the start of the project, the operator must develop a complete safety concept and prepare a risk assess-
ment.
As soon as the intrinsic safety of the chamber for controlling an event of EUCAR hazard levels 4 to 6 is no
longer guaranteed due to the defined load being exceeded (max. one single 18650 cell with LIT MK 240 /
max. three cells with LIT MK 720), the operator must take precautions against the occurrence of such an
event. Consequently, the responsibility for these measures and the further course of action lies solely with
the operator.
The operator must take precautions to ensure that the spread of this event to other cells is safely prevented
(both thermally and mechanically):
• Degrees of freedom are: Distance between cells, flame arrestors, mechanical protection, devices for
switching off individual cells
• The user is obliged to shut down the entire attempt/test upon detection of the first signs of an EUCAR
Hazard Level 4 to 6 event.
• All cells in the cabinet can potentially be pre-damaged after an EUCAR Hazard Levels 4 to 6 event and
must be replaced before starting a new test
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