Cooling for battery-integrated power electronics system
Method for providing cooling of a power electronics system which is integrated in a battery module, in which method the battery module has a battery housing, containing a large number of energy storage units and the power electronics system which is integrated adjacent thereto and includes a printed circuit board which is populated with power semiconductor switches, and a thermally conductive element which creates thermal contact between the respective energy storage units and the power electronics system. Cooling of the power electronics system is achieved by the thermally conductive element which renders possible transfer of thermal energy from the power electronics system to the energy storage units. At least one side of the battery housing is coupled to a cooling system. A surface area of the thermally conductive element is connected to a respective energy storage unit and is contacted by way of a respective curved portion.
1. A method for arranging a power electronics system which is integrated in a battery module, said method comprising:
providing the battery module having a battery housing containing a plurality of energy storage units, the power electronics system, which is positioned adjacent the energy storage units and includes a printed circuit board populated with power semiconductor switches, and a thermally conductive element that creates thermal contact between the respective energy storage units and the power electronics system;
coupling at least one side of the battery housing to a cooling system; and
creating thermal contact between the respective energy storage units and the power electronics system using the thermally conductive element by (i) directly connecting a surface area of the thermally conductive element to a respective energy storage unit, and (ii) directly contacting a respective curved portion that is integrally formed on the thermally conductive element with a part of the power electronics system that is adjacent to the respective energy storage element, wherein the curved portion of the thermally conductive element is spring loaded against the power electronics system for cooling the power electronics system,
wherein the thermally conductive element configured to directly transfer thermal energy from the power electronics system to the energy storage units.
2. The method as claimed in claim 1 , wherein the thermally conductive element is composed of a single piece of sheet metal in a comb-like manner and the respective energy storage elements are received between respective comb teeth or limbs.
3. The method as claimed in claim 1 , in which the thermally conductive element is composed of a plurality of bent sheet-metal partial pieces.
4. The method as claimed in claim 3 , in which a respective bent sheet-metal partial piece is associated with each energy storage unit.
5. The method as claimed in claim 4 , in which the respective bent sheetmetal partial piece has a “U”-shape and a respective energy storage unit is received between two limbs of the “U” and the curved portion is embodied by a bend of the “U”.
6. The method as claimed in claim 4 , in which the respective bent sheetmetal partial piece has a “J”-shape and a respective energy storage unit is contacted by a limb of the “J” and the curved portion is embodied by a bend of the “J”.
7. The method as claimed in claim 1 , in which the respective energy storage unit is a battery cell which takes the form of either a prismatic cell, a pouch cell, or a plurality of round cells arranged in series.
8. The method as claimed in claim 1 , in which a spring force conferred by the curved portion is at least partially established by pressing the housing cover onto the power electronics system.
9. The method as claimed in claim 1 , in which a spring force conferred by the curved portion is at least partially established by fixing the power electronics system inside of the battery housing.
10. The method as claimed in claim 1 , wherein limbs of the thermally conductive element extending from the respective curved portion are positioned to contact a cooling plate of the cooling system.
11. The method as claimed in claim 1 , further comprising a plurality of the thermally conductive elements, wherein the thermally conductive elements are separate, and each thermally conductive element is associated with a single respective energy storage unit.
12. The method as claimed in claim 1 , further comprising a cutout formed on the respective curved portion on the thermally conductive element that is configured to accommodate a connector of a respective energy storage unit.
13. The method as claimed in claim 1 , wherein the thermally conductive element further comprises limbs extending from the respective curved portion, and free ends of the limbs are spaced apart.