BATTERY SYSTEM WITH CYLINDRICAL BATTERY CELLS AND RIBBON BONDING

1 . A system, comprising:

a plurality of cylindrical battery cells that have a uniform orientation, wherein each of the plurality of cylindrical battery cells has a first planar surface and a second planar surface;

a thermal management and structural (TMS) plate that is disposed at the second planar surface of the plurality of cylindrical battery cells; and

a bonding plate that is disposed at the first planar surface of the plurality of cylindrical battery cells, wherein at least some electrical connections between the plurality of cylindrical battery cells and the bonding plate include ribbon bonding.

2 . The system recited in claim 1 , wherein the TMS plate is made of aluminum and has a thickness that is within a range of 1 mm and 10 mm, inclusive.

3 . The system recited in claim 1 , wherein the bonding plate is made of aluminum or copper and has a thickness that is within a range of 0.5 and 2 mm, inclusive.

4 . The system recited in claim 1 , wherein a ribbon that is used in the ribbon bonding has one or more of the following properties: is made of aluminum or copper, has a length that is less than or equal to 30 mm, and is pre-processed before the ribbon bonding to produce a less reflective surface.

5 . The system recited in claim 1 , wherein the system is included in an electric vertical takeoff and landing (eVTOL) aircraft that includes: (1) a fixed wing and (2) at least one pusher tiltrotor.

6 . The system recited in claim 1 , wherein the system is included in an electric vertical takeoff and landing (eVTOL) aircraft that includes: (1) a fixed wing, (2) at least one pusher tiltrotor, and (3) at least one tractor tiltrotor.

7 . The system recited in claim 1 , further including a reusable battery disconnect unit (BDU).

8 . A method, comprising:

providing a plurality of cylindrical battery cells that have a uniform orientation, wherein each of the plurality of cylindrical battery cells has a first planar surface and a second planar surface;

providing a thermal management and structural (TMS) plate that is disposed at the second planar surface of the plurality of cylindrical battery cells; and

providing a bonding plate that is disposed at the first planar surface of the plurality of cylindrical battery cells, wherein at least some electrical connections between the plurality of cylindrical battery cells and the bonding plate include ribbon bonding.

9 . The method recited in claim 8 , wherein the TMS plate is made of aluminum and has a thickness that is within a range of 1 mm and 10 mm, inclusive.

10 . The method recited in claim 8 , wherein the bonding plate is made of aluminum or copper and has a thickness that is within a range of 0.5 and 2 mm, inclusive.

11 . The method recited in claim 8 , wherein a ribbon that is used in the ribbon bonding has one or more of the following properties: is made of aluminum or copper, has a length that is less than or equal to 30 mm, and is pre-processed before the ribbon bonding to produce a less reflective surface.

12 . The method recited in claim 8 , wherein the method is performed by an electric vertical takeoff and landing (eVTOL) aircraft that includes: (1) a fixed wing and (2) at least one pusher tiltrotor.

13 . The method recited in claim 8 , wherein the method is performed by an electric vertical takeoff and landing (eVTOL) aircraft that includes: (1) a fixed wing, (2) at least one pusher tiltrotor, and (3) at least one tractor tiltrotor.

14 . The method recited in claim 8 , further including providing a reusable battery disconnect unit (BDU).