Battery tab and packaging frame design
View Patent ↗Improved battery packaging and constructions for batteries, particularly thin, flat-profile packaged batteries are provided. The battery packaging constructions may eliminate the need for soldering by providing current collector tabs coated by electrically conductive adhesive tape such as z-axis conductive tape and may provide support for current collector tabs and a regular battery perimeter by providing supportive battery packaging and/or frame materials. Better fabrication results, particularly when the batteries are used in smart cards, RFID tags, and medical devices.
1. A battery comprising:
a battery cell;
a first current collector tab and a second current collector tab each having a first portion in contact with the battery cell and a distal end extending from the battery cell;
a lower packaging material disposed below the battery cell and having an outer portion that extends beyond a periphery of the battery cell; and
an upper packaging material disposed above the battery cell wherein the upper and lower packaging materials provide a pouch for the battery cell;
wherein the outer portion of the lower packaging material supports at least a portion of each of the first and second current collector tab;
wherein a tab support frame comprising a polymeric film and one or more sealant layers is interposed between the first and second current collector tabs and the outer portion of the lower packaging material;
wherein the upper packaging material has an outer edge that dose not extend to the distal end of the first and second cuttent collector tabs; and
wherein the polymeric film of the tab support frame does not extend between the battery cell and the lower packaging material.
2. The battery of claim 1 , wherein the edge of the outer portion of the lower packaging material extends at least to the distal end of the first and second current collector tab.
3. The battery of claim 1 , wherein the distal end of each of the first and second current collector tabs extends beyond the edge of the outer portion of the lower packaging material.
4. The battery of claim 1 wherein the upper packaging material and the lower packaging material are comprised of a single continuous piece of packaging material.
5. The battery of claim 1 , further comprising an electrically conductive tape disposed over the first and second current collector tab.
6. The battery of claim 5 , wherein the electrically conductive tape has an outer edge that is substantially flush with the distal end of the at first and second current collector tab and an inner edge that is directed toward the outer edge of the upper packaging material.
7. The battery of claim 6 , wherein a gap is defined between the inner edge of the electrically conductive tape and the outer edge of the upper packaging material.
8. The battery of claim 5 , wherein the electrically conductive tape comprises a z-axis anisotropic electrically conductive tape.
9. The battery of claim 1 , having a raised middle portion, the battery further comprising an external frame seated around the raised middle portion.
10. The battery of claim 9 , wherein the external frame has a height that is substantially equal to height of the raised middle portion.
11. The battery of claim 1 , wherein the battery is a lithium metal battery, a lithium ion battery or a polymer electrolyte battery.
12. The battery of claim 1 , wherein the battery comprises an electrolyte comprising polyimide, lithium salt, and solvent.
13. An electronic device comprising the battery of claim 1 and an electronic circuit.
14. The device of claim 13 wherein an electrical connection between the first and second current collector tab and the electronic circuit is established without a weld or solder.
15. The device of claim 14 , wherein the first and second current collector tabs are connected to the electronic circuit with a conductive adhesive.
16. The device of claim 15 , wherein the first and second current collector tabs are connected to the electronic circuit with a curable conductive adhesive.
17. The device of claim 15 , wherein the first and second current collector tabs are connected to the circuit using a conductive epoxy adhesive.
18. The battery of claim 1 , wherein the cell is rectangular and wherein the first and second current collector tabs extend from the same side of the cell.
19. The device of claim 13 , wherein the device is a smart card, a smart label, an electronically readable card, an RFID tag, an electrically powered label, a medical device, a sensor, a temperature measurement device, or a wearable medical device.
20. The battery of claim 1 , wherein the outer portion of the lower packaging material extends beyond the distal ends of the first and second current collector tabs.
21. The battery of claim 1 , wherein the battery cell comprises an anode, a cathode and an electrolyte between the anode and cathode.
22. The battery os claim 21 , wherin the electrolyte is coextensive with the cathode.
23. The battery of claim 1 , wherin the battery cell comprises:
a first cathode layer on the lower oackaging material;
a first electrolyte layer on the first cathode layer;
an anode layer on the first electrolyte layer;
a second electrolyte layer on the anode layer,and
a second cathode layer on the second electrolyte layer.
24. The battery of claim 23 , wherein the first cathode layer and the second cathode layer are a single continuous piece of material.
25. The battery of claim 24 , wherein the first electrolyte layer and the second electrolyte layer are a single continuous layer of electrolyte material.
26. The battery of claim 23 , wherein the battery comprises a single anode layer.
27. The battery ao claim 1 , wherein the tab support frame comprises the polymeric layer sandwiched between first and second sealant layers.
28. The battery o claim 1 , wherein an opposing tab support frame comprising a polymeric layer and one or more sealant layers is interposed between the first and second current collector tabs and the upper packaging material.
29. The battery of claim 28 , wherein the opposing tab support frame extends to the edge of the upper packaging material.
30. The battery of claim 28 , wherein the oppsing tab support frame comprises the polymeric layer sandwiched between first and second sealant layers.
31. The battery of claim 1 , wherein the tab support frame extends to the edge of the outer portion of the lower packaging material.
32. The battery of claim 1 , wherein the upper packaging material and the lower packaging material each comprise a vapor barrier layer.
33. The battery of claim 32 , wherein the vapor barrier layer comprises aluminum.
34. The battery o claim 33 , wherein the upper packaging material and the lower packaging material each further comprise one or more sealing layers.
35. The battery of claim 1 , wherein the polymeric film of the tab support comprises polyethylene terephthalate.