NOVELTY - The device (1) has gas-permeable primary and secondary containers (20,50) having walls that define primary and secondary interiors (21,51) for accommodating storage unit and primary container, respectively. Gas-absorbing primary and secondary insulating units (10,30) are arranged in intermediate spaces (Z1,Z2), so as to surround storage unit and primary container, respectively. A plastic case (40) is arranged in intermediate space (Z2) such that plastic case surrounds secondary insulating unit and primary container, and is nestled against secondary container.    USE - Accommodating device for lithium-ion based electrochemical energy storage unit such as battery module, battery or battery cell used in vehicle such as hybrid or electric vehicle, and mobile phone, cordless screwdriver, laptop or notebook computer, industrial application and uninterruptible power supply (UPS).    ADVANTAGE - As the gas-absorbing primary and secondary insulating units are arranged to surround storage unit and primary container, respectively, the gas leaked from the damaged power storage unit can be absorbed reliably. Thus, the damage of the plastic case is prevented. Since the gas-absorbing primary and secondary insulating units are thermally insulating, the heat generated by the damaged power storage unit can be easily transferred on the outside of the secondary container. Thus, the fire and injury of damaged power storage unit can be reliably avoided. The accommodating device having high security against environmental hazards is obtained. The non-destructive transport of the damaged electrochemical energy storage unit can be guaranteed. The weight reduction of the accommodating device is achieved, and the handling and transport costs of the accommodating device are reduced.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the accommodating device.    Accommodating device (1)    Gas-absorbing primary and secondary insulating units (10,30)    Gas-permeable primary and secondary containers (20,50)    Primary and secondary interiors (21,51)    Plastic case (40)    Intermediate spaces (Z1,Z2)