Battery with thermal switch
An electric power module for powering electric equipment includes: an enclosure having interconnected walls and defining an inner volume, a wall of the interconnected walls being in heat exchange relationship with an environment; a battery located within the inner volume; and a heat-conducting plate in heat exchange relationship with the battery. The heat-conducting plate has a bridge section movable between first and second positions, the bridge section being spaced apart from the wall in the first position to limit heat transfer from the battery to the environment, and the bridge section being in contact with the wall in the second position to transfer heat from the battery to the environment via the bridge section. An actuator is engaged with to the bridge section of the heat-conducting plate, the actuator being operable to move the bridge section of the heat-conducting plate between the first and second positions.
1 . A method of regulating a temperature of a battery contained within an inner volume of an enclosure, the enclosure having a wall in heat exchange relationship with an environment outside the enclosure, the method comprising:
modifying the temperature of the battery to bring the temperature of the battery within a temperature threshold by modifying a heat flux between the wall and a heat-conducting plate in heat exchange relationship with the battery, including:
transferring heat from a base section of the heat-conducting plate being in heat exchange relationship with the battery to a bridge section of the heat-conducting plate being spaced apart from the battery, and
creating one of a contact and a gap between the bridge section and the wall by moving the bridge section relative to the base section.
2 . The method of claim 1 , wherein the modifying of the temperature includes decreasing the temperature of the battery by increasing the heat flux between the wall and the heat-conducting plate when the temperature of the battery is above the temperature threshold.
3 . The method of claim 1 , wherein the modifying of the temperature includes increasing the temperature of the battery by decreasing the heat flux between the wall and the heat-conducting plate when the temperature of the battery is below the temperature threshold.
4 . The method of claim 1 , wherein the bridge section is movable between a first position and a second position, the bridge section being spaced apart from the wall in the first position to limit heat transfer from the battery to the environment, the bridge section being in contact with the wall in the second position to transfer heat from the battery to the environment via the bridge section.
5 . The method of claim 4 , further comprising using an actuator engaged to the bridge section of the heat-conducting plate to move the bridge section of the heat-conducting plate between the first position and the second position.
6 . The method of claim 5 , wherein the actuator includes a thermally-activated actuator, the using the actuator further comprising increasing the thermally-activated actuator in length from a first length to a second length greater than the first length when a temperature in the inner volume of the enclosure exceeds a given temperature threshold.
7 . The method of claim 6 , further comprising exerting a force on the bridge section of the heat-conducting plate using the thermally-activated actuator to move the bridge section from the first position to the second position.
8 . The method of claim 5 , further comprising locating the actuator within a spacing between the battery and the bridge section of the heat-conducting plate.
9 . The method of claim 8 , wherein the actuator is engaged to a device, the method further comprising using the device to translate a first movement of the actuator in a first direction into a second movement in a second direction normal to the first direction, the spacing extending in the second direction.
10 . The method of claim 4 , further comprising resiliently moving the bridge section between the first position and the second position.
11 . The method of claim 1 , further comprising forming the bridge section monolithically with a remainder of the heat-conducting plate.
12 . The method of claim 1 , further comprising providing at least a portion of the heat-conducting plate as a heat pipe.
13 . The method of claim 1 , further comprising forming the enclosure from interconnected walls, the interconnected walls including said wall in heat exchange relationship with an environment outside the enclosure, all of the interconnected walls but for said wall being insulated.