Rechargeable power source for a load handling device

A load handling device for lifting and moving one or more containers stacked in a storage system within a grid framework structure supporting a plurality of tracks arranged in a grid pattern to define a grid structure above the one or more stacks of containers, the grid pattern including a plurality of grid cells, the load handling device comprising:

• A) a driving mechanism configured and operatively arranged for moving the load handling device on the grid structure;
• B) a vehicle body housing including:
• i) a container receiving space located above the tracks;
• ii) a lifting device having a lifting drive assembly and a grabber device configured, in use, to releasably grip a container and lift the container from the stack into the container receiving space;
• and
• iii) a cassette housing a rechargeable power source for powering the driving mechanism;
• wherein the load handling device comprises:
• a thermal management system having a temperature sensor and at least one temperature regulating device that includes at least one Peltier element having a heat absorbing surface and a heat radiating surface that are opposite each other, said at least one Peltier element being configured to maintain a temperature of the rechargeable power source within a predetermined temperature range in response to a signal from the temperature sensor,
• wherein said at least one Peltier element is configured to selectively cool and/or heat the rechargeable power source by switching polarity;
• and
• wherein the at least one Peltier element comprises:
• a first Peltier element;
• and
• a second Peltier element, the first Peltier element being arranged such that a heat absorbing face of the first Peltier element is in proximity to a first portion of the rechargeable power source, and the second Peltier element being arranged such that a heat radiating face of the second Peltier element is in proximity to a second portion of the rechargeable power source;
• wherein the cassette includes a plurality of walls defining a volume configured to receive the rechargeable power source, wherein the plurality of walls include at least one inlet vent and one outlet vent for circulating air within the cassette for maximizing airflow across the rechargeable power source, and wherein the cassette includes a plurality of airflow channels, each configured as a tortuous path to allow airflow to be guided through a tortuous path around the rechargeable power source.