Battery unit comprising a plurality of electrochemical cells and battery module comprising a plurality of battery units
The invention relates to a battery unit ( 1 ) comprising: a plurality of electrically interconnected electrochemical cells ( 2 ), each of said cells having an electrode arrangement ( 3 ), in particular a lithium-based electrode arrangement ( 3 ) with a cathode contact element ( 4 ) and an anode contact element ( 5 ); and an outer sheathing ( 7 ) surrounding a chamber ( 6 ) in which the electrochemical cells ( 2 ) are arranged. The outer sheathing ( 7 ) is designed as a humidity barrier and as a chemical barrier. Each individual electrochemical cell ( 2 ) of the battery unit ( 1 ) comprises an electrically insulating sheathing ( 8 ) which surrounds the respective electrode arrangement ( 3 ). The invention also relates to a battery module comprising a plurality of electrically interconnected battery units ( 1 ) designed according to the invention.
1. A battery unit ( 1 ) comprising a plurality of electrically interconnected electrochemical cells ( 2 ) that each comprise an electrode assembly ( 3 ) having a cathode contact element ( 4 ) and an anode contact element ( 5 ), and an outer sheath ( 7 ) that encompasses an arrangement chamber ( 6 ) in which the electrochemical cells ( 2 ) are arranged, characterized in that the outer sheath ( 7 ) is embodied as a moisture barrier and also as a chemical barrier and the individual electrochemical cells ( 2 ) each comprise an electrically insulating insulation sheath ( 8 ) that encompasses the respective electrode assembly ( 3 ), wherein at least one safety barrier ( 11 ) is arranged between at least a first number of electrochemical cells ( 2 ) and at least a second number of electrochemical cells ( 2 ) in the arrangement chamber ( 6 ), wherein the safety barrier ( 11 ) is configured to prevent a thermal chain reaction between the first number of electrochemical cells ( 2 ) and the second number of electrochemical cells ( 2 ), wherein the first number of electrochemical cells ( 2 ) is connected in parallel and wherein the second number of electrochemical cells ( 2 ) is connected in parallel.
2. The battery unit ( 1 ) as claimed in claim 1 , characterized in that the outer sheath ( 7 ) comprises a metallization that provides the moisture barrier and the chemical barrier.
3. The battery unit ( 1 ) as claimed in claim 2 , characterized in that a conducting salt-free solvent is introduced into the arrangement chamber ( 6 ) that is encompassed by the outer sheath ( 7 ).
4. The battery unit ( 1 ) as claimed in claim 3 , characterized in that an inert gas is introduced into the arrangement chamber ( 6 ) that is encompassed by the outer sheath ( 7 ).
5. The battery unit ( 1 ) as claimed in claim 4 , characterized in that the outer sheath ( 7 ) is moreover embodied as a mechanical barrier.
6. The battery unit ( 1 ) as claimed in claim 5 , characterized in that the outer sheath ( 7 ) comprises at least a first electrically conductive connecting element ( 9 ) and at least a second electrically conductive connecting element ( 10 ), wherein at least some of the electrochemical cells are interconnected by way of the connecting elements ( 9 , 10 ).
7. The battery unit ( 1 ) as claimed in claim 6 , characterized in that at least one cooling device is arranged in the arrangement chamber ( 6 ), wherein at least one electrochemical cell ( 2 ) is thermally connected to the at least one cooling device.
8. The battery unit ( 1 ) as claimed in claim 7 , characterized in that the electrode assemblies ( 3 ) are embodied as a cell wrap (jelly roll) or cell stack.
9. The battery unit ( 1 ) as claimed in claim 8 , characterized in that the outer sheath ( 7 ) comprises at least one safety valve for reducing an excess pressure within the outer sheath ( 7 ).
10. The battery unit ( 1 ) as claimed in claim 1 , characterized in that a conducting salt-free solvent is introduced into the arrangement chamber ( 6 ) that is encompassed by the outer sheath ( 7 ).
11. The battery unit ( 1 ) as claimed in claim 1 , characterized in that an inert gas is introduced into the arrangement chamber ( 6 ) that is encompassed by the outer sheath ( 7 ).
12. The battery unit ( 1 ) as claimed in claim 1 , characterized in that the outer sheath ( 7 ) is moreover embodied as a mechanical barrier.
13. The battery unit ( 1 ) as claimed in claim 1 , characterized in that the outer sheath ( 7 ) comprises at least a first electrically conductive connecting element ( 9 ) and at least a second electrically conductive connecting element ( 10 ), wherein at least some of the electrochemical cells are interconnected by way of the connecting elements ( 9 , 10 ).
14. The battery unit ( 1 ) as claimed in claim 1 , characterized in that at least one cooling device is arranged in the arrangement chamber ( 6 ), wherein at least one electrochemical cell ( 2 ) is thermally connected to the at least one cooling device.
15. The battery unit ( 1 ) as claimed in claim 1 , characterized in that the electrode assemblies ( 3 ) are embodied as a cell wrap (jelly roll) or cell stack.
16. The battery unit ( 1 ) as claimed in claim 1 , characterized in that the outer sheath ( 7 ) comprises at least one safety valve for reducing an excess pressure within the outer sheath ( 7 ).
17. A battery module having a plurality of electrically interconnected battery units ( 1 ) as claimed in claim 1 .