Battery Assembly

A battery assembly comprising: a first pouch cell for a battery, comprising a flexible surface to allow expansion and contraction of the first pouch cell a cooling plate having: a cell contact area for providing thermal contact between the cooling plate and the flexible surface of the first pouch cell; and an exchange contact area for providing thermal contact with a heat exchanger; a resilient interposer arranged to hold the cell contact area in thermal contact with the flexible surface of the first pouch cell in the event of expansion and/or contraction of the first pouch cell.