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A modular battery includes a housing, a first planar battery cell having a first planar electrode surface, a second planar battery cell having a second planar electrode surface, and an interconnector disposed between the first planar surface and the second planar surface and electrically connecting

A modular battery includes a housing, a first planar battery cell having a first planar electrode surface, a second planar battery cell having a second planar electrode surface, and an interconnector disposed between the first planar surface and the second planar surface and electrically connecting the first and second planar electrode surfaces, side peripheries of the interconnector, the first and second planar battery cells being electrically insulated from the housing. A method is also provided.

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1. A modular battery comprising: a housing,a first planar battery cell removably inside the housing, the first planar battery cell including first positive electrodes including cathode material but not anode material thereon, first negative electrodes including anode material but not cathode materia

1. A modular battery comprising: a housing,a first planar battery cell removably inside the housing, the first planar battery cell including first positive electrodes including cathode material but not anode material thereon, first negative electrodes including anode material but not cathode material thereon and first insulators at side peripheries of the first planar battery cell, the cathode material and anode material of the first planar battery cell being between the first insulators, the first insulators electrically insulating the first positive electrodes and the first negative electrodes from the housing, the first positive electrodes including at least one internal first positive electrode, the first negative electrodes including at least one internal first negative electrode;a second planar battery cell removably inside the housing, the second planar battery cell including second positive electrodes including cathode material but not anode material thereon, second negative electrodes including anode material but not anode material thereon and second insulators at side peripheries of the second planar battery cell, the cathode material and anode material of the second planar battery cell being between the insulators, the second insulators electrically insulating the second positive electrodes and the second negative electrodes from the housing; andan interconnector removably inside the housing disposed between the first planar battery cell and the second planar battery cell parallel to the cathode material and the anode material of the first and second planar battery cells, the interconnector electrically connecting the first and second planar battery cells;wherein the first insulators include a positive first insulator at a first end of the first planar battery cell and a negative first insulator at a second end of the first planar battery cell opposite the first end of the first planar battery cell, the at least one internal first positive electrode including the cathode material at a first end thereof and a bare tab at a second end thereof opposite the first end, the bare tab of the at least one internal first positive electrode being surrounded by the positive first insulator, the at least one internal first negative electrode including the anode material at a first end thereof and a bare tab at a second end thereof opposite the first end, the bare tab of the at least one internal first negative electrode being surrounded by the negative first insulator. 2. The modular battery as recited in claim 1 wherein the first positive electrodes include a first positive end electrode including cathode material on only one side thereof, the at least one internal first positive electrode including cathode material on both sides thereof. 3. The modular battery as recited in claim 2 wherein a side of the first positive end electrode opposite the side including cathode material contacts the interconnector. 4. The modular battery as recited in claim 3 wherein the second negative electrodes include a first second negative end electrode including anode material on only one side thereof and at least one internal second negative electrode including anode material on both sides thereof. 5. The modular battery as recited in claim 4 wherein a side of the second negative end electrode opposite the side including anode material contacts the interconnector such that the interconnector is sandwiched between the first positive end electrode and the second negative end electrode. 6. The modular battery as recited in claim 1 wherein the first negative electrodes include a first negative end electrode including anode material on only one side thereof, the at least one internal first negative electrode including anode material on both sides thereof. 7. The modular battery as recited in claim 1 wherein the first and second insulators are made of a thermally conductive sealant. 8. The modular battery as recited in claim 1 wherein the first insulators include a first positive insulator and a first negative insulator, the first positive electrodes being are coupled together in the first positive first insulator, the first negative electrodes being coupled together in the first negative first insulator. 9. A modular battery comprising: a housing,a first planar battery cell removably inside the housing, the first planar battery cell including first cathodes, first anodes, a first cathode sealant sealing the first cathodes from a first side of the housing and a first anode sealant sealing the first anodes from a second side of the housing opposite the first side, the first cathodes extending into the first cathode sealant, the first anodes extending into the first anode sealant;a second planar battery cell removably inside the housing, the second planar battery cell including second cathodes, second anodes, a second cathode sealant sealing the second cathodes from the first side of the housing and a second anode sealant sealing the second anodes from the second side of the housing opposite the first side, the second cathodes extending into the second cathode sealant, the second anodes extending into the second anode sealant; andan interconnector removably inside the housing disposed between the first planar battery cell and the second planar battery cell and electrically connecting the first and second planar battery cells, peripheries of the interconnector being electrically isolated from the first and second sides of the housing. 10. The modular battery as recited in claim 9 wherein the first cathodes include at least one first internal cathode and the first anodes include at least one internal anode, each of the at least one first internal cathode being formed of a plate having active cathode material on both sides thereof, each of the at least one first internal anodes being formed of a plate having active anode material on both sides thereof. 11. The modular battery as recited in claim 9 wherein the first anodes include a first end anode and the second cathodes include a second end cathode, the first end anode including an active anode material coated surface facing an inside of the first planar battery cell and a first bare surface facing the interconnector, the second end cathode including an active cathode material coating surface facing an inside of the second planar battery cell and a second bare surface facing the interconnector. 12. The modular battery as recited in claim 11 wherein the interconnector contacts the first and second bare surfaces to electrically connect the first anodes and the second cathodes. 13. The modular battery as recited in claim 9 wherein the first cathode sealant and the first anode sealant conduct heat from the first planar battery cell to the housing and the second cathode sealant and the second anode sealant conduct heat from the second planar battery cell to the housing. 14. A method for forming a modular battery comprising: forming a first planar battery cell to include first positive electrodes each including cathode material but not anode material thereon, first negative electrodes each including anode material but not cathode material thereon and first insulators at side peripheries of the first planar battery cell;forming a second planar battery cell to include second positive electrodes each including cathode material but not anode material thereon, second negative electrodes each including anode material but not cathode material thereon and second insulators at side peripheries of the second planar battery cell;placing the first planar battery cell in a housing so the first insulators insulate the first positive electrodes and the first negative electrodes from the housing;placing an interconnector over the first planar battery cell in the housing such that the interconnector is positioned parallel to the cathode material and anode material of the first planar battery and the interconnector does not extend past the side peripheries of the first planar battery cell; andplacing the second planar battery cell in the housing so the second insulators insulate the second positive electrodes and the second negative electrodes from the housing and so the interconnector electrically connects the first and second planar battery cells;wherein the first positive electrodes are formed to each include a tab extending away from the cathode material, the first negative electrodes are formed to each include a tab extending away from the anode material, the first insulators include a positive first insulator at a first end of the first planar battery cell and a negative first insulator at a second end of the first planar battery cell opposite the first end of the first planar battery cell, the tabs of the first positive electrodes extending into the positive first insulator, the tabs of the first negative electrodes extending into the negative first insulator. 15. The method as recited in claim 14 wherein after the first planar battery, the interconnector and the second planar battery are placed in the housing and the interconnector electrically connects the first and second planar battery cells, the interconnector is not electrically in contact with side peripheries of the first and second battery cells or the housing. 16. The modular battery as recited in claim 1 wherein the first planar battery cell includes an electrically insulating frame on sides of the first planar battery cell orthogonal to the first insulators. 17. The modular battery as recited in claim 16 wherein the electrically insulating frame is a two-part electrically insulating frame having front and rear, generally C-shaped, frame sections inserted over the first positive and negative electrodes and the first insulators. 18. The modular battery as recited in claim 16 wherein the electrically insulating frame is thermally conducting in order to remove heat from the first planar battery cell.