Battery module

1. A battery module comprising:

a plurality of sides defining a housing of the battery module;

a plurality of battery cells held within the housing of the battery module;

a plurality of heat pipes configured to be thermally connected to a heat reservoir, the heat pipes being individually sealed and integrated in an external surface of one side of the housing of the battery module to internally re-distribute heat within the battery module, the heat pipes being soldered onto the external surface of the battery module and configured to be arranged in physical contact with a heat conducting element for transferring heat to and/or from the battery module, each heat pipe in the plurality of heat pipes comprising a condensation portion positioned along a centrally arranged portion of the external surface of the battery module and an evaporation portion positioned relatively closer to a periphery of the external surface of the battery module as compared to the condensation portion; and

the heat conducting element centrally arranged along a longitudinal axis of the battery module,

wherein the heat pipes soldered onto the external surface of the battery module are configured to transport heat away from the periphery of the external surface of the battery module to the centrally arranged portion of the external surface, via the heat pipe, to internally re-distribute heat within the battery module separate from heat being transferred from the battery module to the heat reservoir, the heat conducting element, an external heat sink, and/or an external cooling plate.

2. The battery module according to claim 1 , the plurality of heat pipes being configured to be fluidly separated from the heat reservoir.

3. The battery module according to claim 1 , wherein each heat pipe in the plurality of heat pipes includes a heat transfer fluid disposed inside the heat pipe and being configured to undergo a phase change such that the heat transfer fluid evaporates in the evaporation portion and condenses in the condensation portion.

4. The battery module according to claim 3 , being configured to induce a movement of the heat transfer fluid within each heat pipe including induced movement of the heat-transfer fluid as a liquid from the condensation portion to the evaporation portion using capillary action, centrifugal force and/or gravity.

5. The battery module according to claim 1 , each heat pipe being L-shaped.

6. The battery module according to claim 1 , the plurality of heat pipes being at least partly integrated in a bottom surface of a bottom side of the battery module.

7. The battery module according to claim 1 , wherein the battery cells of the plurality of battery cells are spaced apart from each other, and a plurality of fins is arranged in the battery cell spacings.

8. The battery module according to claim 7 , further comprising a plurality of fin heat pipes arranged in said plurality of fins, the fin heat pipes being individually sealed.

9. The battery module according to claim 7 , each heat pipe integrated in the external surface of the battery module comprising a fin portion configured to extend into a fin, wherein each fin portion is fluidly coupled to the condensation portion and the evaporation of the corresponding heat pipe.

10. A battery pack comprising a plurality of the battery modules according to claim 1 , and an externally arranged heat reservoir for transferring heat to and/or from the battery modules.

11. The battery pack according to claim 10 , further comprising a hollow plate for supporting the battery modules, the heat pipes of the battery modules being configured to be arranged in physical contact with an external surface of the hollow plate, and the externally arranged heat reservoir being formed in the hollow plate.

12. The battery pack according to claim 10 , further comprising a frame holding said battery modules, and a battery pack lid.

13. A vehicle comprising the battery pack according to claim 10 .

14. The battery module according to claim 1 , wherein the plurality of sides of the housing the battery module

define a rectangular cuboid shape.

15. The battery module according to claim 14 , wherein each heat pipe defines an L-shape within the one side of the housing including the external surface.

16. The battery module according to claim 14 , wherein each of the heat pipes is soldered onto the external surface of a bottom side of the plurality of sides defining the rectangular cuboid shape.

17. The battery module according to claim 15 , wherein the L-shape defined by each heat pipe is defined entirely in a geometrical plane parallel to the external surface of the bottom side of the plurality of sides defining the rectangular cuboid shape.

18. The battery module according to claim 9 , wherein each heat pipe includes a horizontal pipe portion and the fin portion, wherein the fin portion of each heat pipe is configured to re-distribute heat within the battery module, and the horizontal pipe portion is configured to re-distribute heat along the external surface of the battery module.

19. The battery module according to claim 1 , wherein the plurality of battery cells held within the housing of the battery module defines a constant spacing between any two adjacent battery cells.