Battery interconnects
Provided are interconnects for interconnecting a set of battery cells, assemblies comprising these interconnects, methods of forming such interconnects, and methods of forming such assemblies. An interconnect includes a conductor comprising two portions electrically isolated from each other. At least one portion may include two contacts for connecting to battery cells and a fuse forming an electrical connection between these two contacts. The interconnect may also include an insulator adhered to the conductor and mechanically supporting the two portions of the conductor. The insulator may include an opening such that the fuse overlaps with this opening, and the opening does not interfere with operation of the fuse. In some embodiments, the fuse may not directly interface with any other structures. Furthermore, the interconnect may include a temporary substrate adhered to the insulator such that the insulator is disposed between the temporary substrate and the conductor.
1. An interconnect for interconnecting a set of battery cells, the interconnect comprising:
a conductor comprising a plurality of contacts, a plurality of fuses, and a remaining part, wherein:
each of the plurality of contacts is coupled to a corresponding one of the plurality of fuses that forms an electrical connection between each of the plurality of contacts and the remaining part,
the plurality of contacts, the plurality of fuses, and the remaining part are monolithic and are formed from a continuous metal layer,
the remaining part comprises a voltage monitoring trace that is monolithic and has same thickness as each of the plurality of contacts and each of the plurality of fuses by being formed from the continuous metal layer, and
the voltage monitoring trace comprises a contact point for forming an external connection; and
a first insulator adhered to the conductor, wherein the first insulator comprises a first insulator opening that fully overlaps with a first contact of the plurality of contacts such that the first contact is not mechanically supported by the first insulator and such that the first contact is configured to protrude into the first insulator opening while forming an electrical connection.
2. The interconnect of claim 1 , further comprising a second insulator adhered to the conductor,
wherein the conductor is positioned between the first insulator and the second insulator, and
wherein the second insulator comprises a second insulator opening that partially overlaps with the first contact such that the second insulator is adhered to and mechanically supports an edge of the first contact.
3. The interconnect of claim 2 , wherein the first contact is configured to release from the second insulator to form a connection with a terminal of a first battery cell of the set of battery cells through the first insulator opening.
4. The interconnect of claim 2 , wherein each of the plurality of fuses overlaps with both the first insulator opening and the second insulator opening.
5. The interconnect of claim 1 , further comprising:
a second insulator adhered to the conductor, wherein the conductor is positioned between the first insulator and the second insulator, and wherein the second insulator comprises a second insulator opening that fully overlaps with the first contact such that the first contact is not mechanically supported by the second insulator; and
a temporary substrate adhered to the second insulator such that the second insulator is positioned between the temporary substrate and the conductor, wherein the temporary substrate is adhered to the first contact and mechanically supports the first contact.
6. The interconnect of claim 5 , wherein the temporary substrate comprises a first substrate opening that partially overlaps with the first contact such that the temporary substrate is adhered to and mechanically supports an edge of the first contact.
7. The interconnect of claim 6 , wherein the first contact is configured to release from the temporary substrate to form a connection with a terminal of a first battery cell of the set of battery cells through the first insulator opening.
8. The interconnect of claim 1 , wherein the continuous metal layer is a rolled metal foil comprising aluminum that has an in-plane elongated grain structure thereby increasing a fatigue life of the plurality of fuses.
9. The interconnect of claim 1 , wherein:
the conductor comprises aluminum, and
the thickness is from 50 micrometers to 2000 micrometers.
10. The interconnect of claim 1 , wherein:
the conductor comprises aluminum with two oxide layers formed on opposite sides of the conductor, and
the two oxide layers have different thicknesses.
11. The interconnect of claim 1 , wherein each of the plurality of fuses is freestanding and does not overlap with the first insulator.
12. The interconnect of claim 1 , wherein each of the plurality of fuses overlaps with the first insulator.
13. The interconnect of claim 1 , wherein the first insulator comprises a material selected from the group consisting of polyimide (PI), polyethylene naphthalate (PEN), and polyethylene terephthalate (PET).
14. The interconnect of claim 1 , wherein the first insulator comprises an adhesive sublayer, adhered to the conductor.
15. The interconnect of claim 1 , wherein the first insulator comprises an additional adhesive sublayer facing away from the conductor.
16. An assembly comprising:
a set of battery cells; and
an interconnect comprising:
a conductor comprising a plurality of contacts, a plurality of fuses, and a remaining part, wherein:
each of the plurality of contacts is coupled to a corresponding battery cell in the set of battery cells and is further coupled to a corresponding one of the plurality of fuses that forms an electrical connection between the corresponding battery cell and the remaining part,
the plurality of contacts, the plurality of fuses, and the remaining part are monolithic and are formed from a continuous metal layer,
the remaining part comprises a voltage monitoring trace that is monolithic and has same thickness as each of the plurality of contacts and each of the plurality of fuses by being formed from the continuous metal layer, and
the voltage monitoring trace comprises a contact point for forming an external connection; and
a first insulator adhered to the conductor, wherein the first insulator comprises a first insulator opening that fully overlaps with a first contact of the plurality of contacts such that the first-contact is not mechanically supported by the first insulator and such that the first contact protrudes into the first insulator opening and forms an electrical connection with one battery cell in the set of battery cells.
17. The assembly of claim 16 , further comprising a second insulator adhered to the conductor, wherein the conductor is positioned between the first insulator and the second insulator, and wherein the second insulator comprises a second insulator opening that partially overlaps with the first contact.
18. The assembly of claim 16 , wherein the voltage monitoring trace is folded to a side of the set of battery cells.
19. An interconnect system comprising:
a first conductor portion;
a second conductor portion, electrically isolated from the first conductor portion, wherein each of the first conductor portion and the second conductor portion comprises, a plurality of fuses, and a remaining part, wherein:
each of the plurality of contacts is coupled to a corresponding one of the plurality of fuses that forms an electrical connection between each of the plurality of contacts and the remaining part by the corresponding one of the plurality of fuses,
the plurality of contacts, the plurality of fuses, and the remaining part are monolithic and are formed from a continuous metal layer,
the remaining part comprises a voltage monitoring trace that is monolithic and has same thickness as each of the plurality of contacts and each of the plurality of fuses by being formed from the continuous metal layer, and
the voltage monitoring trace comprises a contact point for forming an external connection; and
a first insulator adhered to the first conductor portion and the second conductor portion, wherein the first insulator comprises a first insulator opening that fully overlaps with a first contact of the plurality of contacts such that the first contact is not mechanically supported by the first insulator and such that the first contact is configured to protrude into the first insulator opening while forming an electrical connection.
20. The interconnect system of claim 19 , further comprising a second insulator adhered to the first conductor portion and the second conductor portion, wherein the first conductor portion and second conductor portion are positioned between the first insulator and the second insulator, and wherein the second insulator comprises a second insulator opening that partially overlaps with the first contact such that the second insulator is adhered to and mechanically supports an edge of the first contact.