Temperature control for a battery module and method for operating such

1. A battery module with a plurality of battery cells ( 2 ), the battery module comprising:

a first temperature control member ( 3 ) and second temperature control member ( 4 ), which are connected together directly thermally conductively in places, wherein the plurality of battery cells ( 2 ) is connected directly thermally conductively with the second temperature control member ( 4 ), and at least one switchably configured Peltier element ( 5 ), which is connected thermally conductively with the first temperature control member ( 3 ) and the second temperature control member ( 4 ), is arranged between the first temperature control member ( 3 ) and the second temperature control member ( 4 ),

characterized in that

a control device ( 6 ) is configured to, depending on ambient conditions of the plurality of battery cells ( 2 ), drive the at least one Peltier element ( 5 ) in such a way that, when switched on, the at least one Peltier element ( 5 ) (i) transfers heat from the second temperature control member ( 4 ) to the first temperature control member ( 3 ) when the ambient conditions are in a first state and (ii) transfers heat from the first temperature control member ( 3 ) to the second temperature control member ( 4 ) when the ambient conditions are in a second state,

wherein the second temperature control member ( 4 ) has at least one recess ( 88 ),

wherein the at least one recess ( 88 ) has a first portion in which the at least one Peltier element ( 5 ) is accommodated, and

wherein the at least one recess ( 88 ) has a second portion that extends from the first portion to a sidewall of the second temperature control member ( 4 ).

2. The battery module according to preceding claim 1 ,

characterized in that

the first temperature control member ( 3 ) has a first temperature control compartment ( 7 ) configured for flow through by temperature control fluid.

3. The battery module according to claim 1 ,

characterized in that

the second temperature control member ( 4 ) has a second temperature control compartment ( 8 ) configured such that temperature control fluid can flow through the second temperature control compartment ( 8 ), and the at least one recess ( 88 ) defines a region ( 80 ) through which temperature control fluid cannot flow, the region ( 80 ) being connected directly thermally conductively with the at least one Peltier element ( 5 ).

4. The battery module according to preceding claim 3 ,

characterized in that

the battery module ( 1 ) has a valve element ( 9 ) which regulates flow through the second temperature control compartment ( 8 ),

the control device ( 6 ) is further configured to drive the valve element ( 9 ) in such a way that, when closed, the valve element ( 9 ) prevents flow through the second temperature control compartment ( 8 ) and, when open, allows flow through the second temperature control compartment ( 8 ).

5. The battery module according to claim 2 ,

characterized in that

the first temperature control compartment ( 7 ) and the second temperature control compartment ( 8 ) are connected in a fluid conducting manner.

6. The battery module according to claim 5 ,

characterized in that

the first temperature control compartment ( 7 ) forms a first flow compartment ( 71 ) and a second flow compartment ( 72 ), which are separated in flow-conducting manner, wherein an inlet ( 73 ) of the first flow compartment ( 71 ) is connected in flow-conducting manner with an outlet ( 78 ) of the second temperature control compartment ( 8 ).

7. The battery module according to claim 1 ,

characterized in that

the battery module ( 1 ) comprises a housing ( 100 ), wherein the housing ( 100 ) forms the first temperature control member ( 3 ) at least in part.

8. The battery module according to claim 3 ,

characterized in that

the second temperature control member ( 4 ) comprises two metallic plates bonded together to form the second temperature control compartment ( 8 ).

9. The battery module according to claim 1 ,

characterized in that

at least one first thermally conductive compensating element is arranged between the first temperature control member ( 3 ) and the second temperature control member ( 4 ),

at least one second thermally conductive compensating element is arranged between the plurality of battery cells ( 2 ) and the second temperature control member ( 4 ), and/or

at least one third thermally conductive compensating element is arranged between the at least one Peltier element ( 5 ) and the first temperature control member ( 3 ) and/or the second temperature control member ( 4 ).

10. The battery module according to claim 2 ,

characterized in that the temperature control fluid is a temperature control liquid.

11. The battery module according to claim 8 ,

characterized in that the two metallic sheets are aluminum plates.

12. The battery module according to preceding claim 1 ,

characterized in that

the at least one recess ( 88 ) is at least two recesses ( 88 ),

wherein a first recess of the at least two recesses ( 88 ) has the first portion in which the at least one Peltier element ( 5 ) is accommodated, and wherein the first recess has the second portion that extends from the first portion of the first recess to the sidewall of the second temperature control member ( 4 ),

wherein a second recess of the at least two the recesses ( 88 ) has another first portion in which another at least one Peltier element ( 5 ) is accommodated, and wherein the second recess has another second portion that extends from the another first portion to a different sidewall of the second temperature control member ( 4 ), and

wherein the first recess and the second recess at least in part define a region ( 80 ) through which temperature control fluid cannot flow.

13. A method for operating a battery module ( 1 ) according to claim 1 , characterized in that the control device ( 6 ) drives the at least one Peltier element ( 5 ) and arranges the at least one Peltier element ( 5 ) in a switched-on state when a magnitude of a temperature difference between the second temperature control member ( 4 ) and the first temperature control member ( 3 ) lies below a predetermined value.