ULTRACAPACITOR AND INTEGRATED BATTERY COMBINATION

1 . A combined battery/capacitor energy storage device, comprising:

a housing comprising an integrated battery housing portion, a capacitor housing portion, and a housing lid;

a plurality of battery electrodes and electrolyte contained directly within the integrated battery housing portion and configured to form an integrated battery within the integrated battery housing portion;

a capacitor connected in parallel with the battery and contained within the capacitor housing portion; and

a first device terminal and a second device terminal extending through the housing.

2 . The energy storage device of claim 1 , wherein the battery housing portion and the capacitor housing portion are horizontally adjacent with respect to each other.

3 . The energy storage device of claim 2 , wherein the housing comprises two shared outer sidewalls and base, each forming a part of both the battery housing portion and the capacitor housing portion, an outer battery sidewall forming a part of the battery housing portion, an outer capacitor sidewall forming a part of the capacitor housing portion, and a single inner sidewall extending between the two shared outer sidewalls and separating the battery housing portion and the capacitor housing portion.

4 . The energy storage device of claim 3 , wherein the four outer sidewalls, base, and single inner sidewall comprise a unitary piece.

5 . The energy storage device of claim 3 , wherein the housing lid is configured to enclose both the capacitor housing portion and the battery housing portion.

6 . The energy storage device of claim 5 , further comprising a battery lid configured to enclose and seal the battery housing portion.

7 . The energy storage device of claim 6 , wherein the battery comprises a battery terminal extending through the battery lid, and the capacitor comprises a capacitor terminal, the energy storage device further comprising a bus bar connecting the battery terminal and the capacitor terminal and extending between the battery lid and the device lid.

8 . The energy storage device of claim 1 , wherein the housing is configured to conform to a form factor of a standard OEM battery.

9 . The energy storage device of claim 8 , wherein the housing is configured to conform to a form factor of a BCI Group battery.

10 . The energy storage device of claim 1 , further comprising a third device terminal extending through the housing.

11 . The energy storage device of claim 1 , wherein at least one of the battery housing portion and the capacitor housing portion is positioned above the other of the battery housing portion and the capacitor housing portion.

12 . The energy storage device of claim 3 , wherein the capacitor housing portion is positioned above the battery housing portion.

13 . A method of manufacturing a combined battery/capacitor energy storage device, comprising:

providing an energy storage device housing, the device housing comprising an integrated battery housing portion, a capacitor housing portion, and a housing lid;

inserting a plurality of battery electrodes into the battery housing portion, each battery electrode comprising a first and second battery cell terminal;

filling the battery housing portion with electrolyte;

connecting the plurality of first and second battery cell terminals, to form a first and second battery terminal, respectively;

inserting one or more capacitors into the capacitor housing portion, wherein the one or more capacitors comprise a first and second capacitor terminal;

connecting the first battery terminal and the first capacitor terminal, and the second battery terminal and the second capacitor terminal;

covering the battery housing portion and the capacitor housing portion with the housing lid; and

forming a first and second device terminal extending through the housing.

14 . The method of claim 13 , further comprising sealing the battery with a battery lid positioned under the housing lid.

15 . The method of claim 13 , wherein the energy storage device housing comprises two shared outer sidewalls and base, each forming a part of both the battery housing portion and the capacitor housing portion, an outer battery sidewall forming a part of the battery housing portion, an outer capacitor sidewall forming a part of the capacitor housing portion, and a single inner sidewall extending between the two shared outer sidewalls and separating the battery housing portion and the capacitor housing.

16 . The method of claim 15 , wherein the four outer sidewalls, base, and single inner sidewall comprise a unitary piece.

17 . The method of claim 13 , wherein the housing is configured to conform to a form factor of a standard OEM battery.

18 . The method of claim 17 , wherein the housing is configured to conform to a form factor of a BCI Group battery.

19 . The method of claim 13 , further comprising forming a third device terminal extending through the housing.