Patent FR-2963484-A1 (FR)
Title: Electrical battery useful in a motor vehicle, comprises a casing, a set of energy generating cells, a longitudinal arrangement consisting of the energy generating cells, a cooling system, and an electrically insulating plate
Inventor: GUILLARD STEPHANE
IPC: H01M50/264
Filed: 2010-07-29
Abstract: The electrical battery comprises a casing (1), a set of energy generating cells (2), a longitudinal arrangement (3, 4) consisting of the energy generating cells, a cooling system, and an electrically insulating and thermally conductive intermediate plate. The cells of the arrangement are urged against one another while secured together by a unit compressing the cells along the longitudinal axis of the arrangement. The longitudinal arrangement is attached to the casing via the compression unit, which is partially attached to the casing. The electrical battery comprises a casing (1), a set of energy generating cells (2), a longitudinal arrangement (3, 4) consisting of the energy generating cells, a cooling system, and an electrically insulating and thermally conductive intermediate plate. The cells of the arrangement are urged against one another while secured together by a unit compressing the cells along the longitudinal axis of the arrangement. The longitudinal arrangement is attached to the casing via the compression unit, which is partially attached to the casing by attachment members. The cooling system comprises: an electrically insulating and thermally conductive layer (8) that thermally connects the cells of the longitudinal arrangement to single heat-dissipation surface (12) placed in the casing or formed by one of the walls of the casing to ensure a uniform discharge, toward the dissipation surface, of the thermal energy generated by each of the cells of the arrangement; and a cooling unit for cooling a further heat-dissipation surface. The electrically insulating and thermally conductive layers consist of a thermal gel, which is partially polymerized or non-polymerized. The compression unit is configured such that the cells of the arrangement are set back from the heat-dissipation surface. The electrically insulating and thermally conductive layers consisting of the thermal gel are partially placed between the cells and the heat-dissipation surface. The layer is pressed against one of the walls held in position by a retaining element. The retaining element is formed from a thermoretractable film, which covers only the periphery of the thermally conductive layer. The cooling unit comprises: a connection between the heat-dissipation surface and a ground to create an evacuation path for discharging the thermal energy stored by the surface to the ground; and a fluid cooling device or a phase change cooling device. The cooling system is a liquid-cooled circuit device or a ventilation device. The compression unit comprises two plates, each of which is located at the ends of the longitudinal arrangements of the respective cells. The compression plate is integrally formed within the casing. The heat-dissipation surface is constituted by a bottom of the casing and thermally brought into contact with the bottom of each cell of the arrangement through one of the electrically insulating and thermally conductive layers. The intermediate plate is placed between the two consecutive cells to increase the heat exchange area.