Battery module and battery system with heat exchanger housing
A battery module comprising a liquid-tight housing and a plurality of battery cells arranged in the liquid-tight housing is disclosed. A first tempering fluid is included in the liquid-tight housing in thermal contact with the plurality of battery cells and with an inner surface of the liquid-tight housing. The liquid-tight housing is constructed to allow for a flow of a second tempering fluid between the inner surface and an outer surface of the liquid-tight housing. Further provided is a battery system comprising a battery module and a secondary tempering system connected to the liquid-tight housing of the battery module. The secondary tempering system is configured to establish the flow of the second tempering fluid.
1. A battery module, comprising
a liquid-tight housing;
a plurality of battery cells arranged in the liquid-tight housing; and
a first tempering fluid included in the liquid-tight housing in thermal contact with the plurality of battery cells and with an inner surface of the liquid-tight housing;
wherein the liquid-tight housing is constructed to allow for a flow of a second tempering fluid between the inner surface and an outer surface of the liquid-tight housing;
wherein the liquid-tight housing comprises:
a profile housing with two open end sides, which are located opposite to each other along the main axis of the battery module; and
a first end plate and a second end plate liquid-tightly closing the profile housing at the two open end sides, and
wherein the profile housing is configured as a double-walled profile housing, wherein a second fluid channel for the flow of the second tempering fluid is integrally formed.
2. The battery module according to claim 1 , further comprising a pump arranged on an outside of the liquid-tight housing and connected to an interior of the liquid-tight housing via first fluid channels of the liquid-tight housing, wherein the pump is configured to generate a flow of the first tempering fluid within the liquid-tight housing by pumping the first tempering fluid through the first fluid channels.
3. The battery module according to claim 2 , wherein the liquid-tight housing, the pump and the first fluid channels form a material closed system of the first tempering fluid.
4. The battery module according to claim 1 , wherein (i) the second fluid channel protrudes into an interior of the liquid-tight housing; (ii) the second fluid channel has a circular cross section; (iii) the second fluid channel extends in a direction of a main axis of the battery module; or (iv) any combination of (i)-(iii).
5. The battery module according to claim 1 , comprising
a first seal arranged circumferentially between the first end plate and the profile housing; and
a second seal arranged circumferentially between the second end plate and the profile housing.
6. The battery module according to claim 5 , wherein (i) the first seal and the second seal are flat seals; (ii) the first seal and the second seal are each arranged in a plane perpendicular to the main axis of the battery module; or (iii) both (i) and (ii).
7. The battery module according to claim 1 , wherein the profile housing comprises a material with a thermal conductivity of 50 W/(m·K) or higher.
8. The battery module according to claim 1 , wherein (i) the profile housing comprises aluminium; (ii) the first end plate and/or the second end plate comprises a synthetic material; or both (i) and (ii).
9. The battery module according to claim 1 , wherein the liquid-tight housing is partially filled with a gas.
10. The battery module according to claim 9 , wherein a volume percentage of the liquid-tight housing filled by the gas is 5% or lower.
11. The battery module according to claim 1 , wherein the liquid-tight housing is pressure-tight.
12. The battery module according to claim 11 , wherein the liquid-tight housing is pressure-tight up to a positive pressure of at least 1 bar.
13. The battery module according to claim 1 , further comprising a plurality of cell holders including half-shell shaped portions configured to hold the plurality of battery cells, wherein lateral surfaces of the plurality of battery cells are covered by the half-shell shaped portions.
14. The battery module according to claim 1 , wherein each battery cell is electrically connected to one or more other battery cells in parallel or in series so as to form a battery stack.
15. The battery module according to claim 14 , further comprising an electrical feedthrough connected to the battery stack.
16. A battery system, comprising
a battery module according to claim 1 ; and
a secondary tempering system connected to the liquid-tight housing of the battery module and configured to establish the flow of the second tempering fluid.
17. The battery system according to claim 16 , wherein the first tempering fluid differs from the second tempering fluid.