Battery with laminated insulator/metal/insulator case

A battery comprising:

• a plurality of positive electrode sheets and a plurality of negative electrode sheets;
• a first connector electrically connecting the plurality of positive electrode sheets together;
• a second connector electrically connecting the plurality of negative electrode sheets together;
• a case including an upper case body and lower case body, each of the upper and lower case bodies comprising an electrically conducting metal foil sandwiched between electrically insulating polymer layers, at least one of the upper and lower case bodies including a recess that receives at least part of the plurality of positive and negative electrode sheets and a peripheral flange at which the upper and lower case bodies are sealed to each other, wherein
• the electrically conducting metal foil of the upper case body is exposed at a first region, inside the case, where part of one of the insulating polymer layers is missing, and the first connector is electrically connected to the electrically conducting metal foil of the upper case body at the first region,
• the electrically conducting metal foil of the upper case body is exposed, at a second region, on an outside surface of the upper case body, where part of one of the electrically insulating polymer layers is missing, providing a first terminal of the battery,
• the electrically conducting metal foil of the lower case body is exposed at a third region, inside the case, where part of one of the insulating polymer layers is missing, and the second connector is electrically connected to the electrically conducting metal foil of the lower case body at the third region, and
• the electrically conducting metal foil of the lower case body is exposed, at a fourth region, on an outside surface of the lower case body, where part of one of the electrically insulating polymer layers is missing, providing a second terminal of the battery.