Integrated frame battery cell
An electrolyte containment structure for an electrode jelly roll and electrolyte in a portable power source is described. The electrolyte containment structure comprises metal foil, such as metal foil sleeve, coupled to and partially surrounding a rigid frame. The rigid frame can protect the electrode jelly roll edges from crush events. To prevent shorts, the metal foil can be coated in plastic, which can insulate the metal foil from the electrode jelly roll. Further, the plastic can serve as a bonding and sealing agent. For instance, the metal foil can be coupled to the rigid frame using a thermal bonding method involving melting of the plastic. The rigid frame can provide a platform for connector pads and safety circuitry associated with the portable power source. The connector pads and safety circuitry can be assembled as modular components, which can simplify the assembly process The containment structure provides features associated with a pouch cell battery design, such as a light-weight metal foil pouch, but can be utilized in a portable computing device without being enclosed in a hard casing traditionally associated with pouch cell battery designs.
1. A portable computing device comprising:
a display;
a processor;
a memory;
two or more portable power sources for providing power to the display, the processor and the memory, wherein each of the two or more portable power sources comprises:
an electrode assembly including an anode and a cathode;
an electrolyte;
power conditioning circuitry for changing a voltage output level of the portable power source;
a containment structure for enclosing the electrode and the electrolyte, the containment structure configured to prevent leakage of the electrolyte or gasses generated during operation of the portable power source; the containment structure comprising:
a rigid frame;
a metal foil bonded to the rigid frame wherein the metal foil encloses a portion of the rigid frame, the electrode assembly and the electrolyte; and
a vent configured to evacuate the containment structure which places the containment structure in a low pressure condition under vacuum;
an electrical connector pad coupled to the rigid frame for drawing power from the portable power source; and
safety circuitry coupled to the rigid frame; the safety circuitry electrically coupled to the electrical connector pad and the anode and the cathode of the electrode assembly; and
power control circuitry separate from the two or more portable power sources, wherein the power control circuitry is configured to command each of the two or more portable power sources to change their voltage output level using the power conditioning circuitry.
2. The portable computing device of claim 1 , wherein the power control circuitry is further configured to allow the two or more portable power sources to be operated in parallel mode, in a series mode or an independent mode.
3. The portable computing device of claim 2 , wherein the power control circuitry is further configured to switch the two or more portable power sources between the parallel, series and the independent operational modes.
4. The portable computing device of claim 1 , wherein the electrode assembly and the electrolyte form a lithium ion polymer battery cell.
5. A portable power source, the portable power source comprising:
an electrode assembly including an anode and a cathode;
an electrolyte;
a containment structure for enclosing the electrode and the electrolyte, the containment structure configured to prevent leakage of the electrolyte or gasses generated during operation of the portable power source; the containment structure comprising:
a rigid rectangular-shaped frame,
a metal foil bonded to the rigid rectangular-shaped frame,
wherein the metal foil encloses a portion of the rigid rectangular-shaped frame, the electrode assembly and the electrolyte,
wherein a portion of the bond between the rigid rectangular-shaped frame and the metal foil prevents the electrolyte or the gasses from escaping the containment structure, and
a vent configured to evacuate the containment structure which places the containment structure in a low pressure condition under vacuum;
an electrical connector pad coupled to the rigid rectangular-shaped frame for drawing power from the portable power source; and
safety circuitry coupled to the rigid frame; the safety circuitry electrically coupled to the electrical connector pad and the anode and the cathode of the electrode assembly.
6. The portable computing device of claim 1 , wherein the portable computing device is selected from the group consisting of a laptop computer, a netbook computer, a tablet computer, a smart phone and a portable media player.
7. The portable computing device of claim 1 , wherein the rigid frame includes an injection port and the electrolyte is added to the containment structure via the injection port.
8. The portable computing device of claim 1 , wherein the metal foil is provided as a metal pouch or as a metal sleeve.
9. The portable computing device of claim 1 , wherein the metal foil is heat sealed to the rigid frame.
10. The portable computing device of claim 1 , wherein the metal foil includes a laminate layer between the metal foil to the rigid frame.
11. The portable computing device of claim 1 , wherein the electrode assembly comprises a jelly roll electrode assembly.
12. The portable computing device of claim 1 , wherein the metal foil is aluminum.
13. The portable computing device of claim 1 , wherein the metal foil is between 80 to 150 microns thick.
14. The portable computing device of claim 1 , wherein the rigid frame includes a corner and wherein the metal foil is bonded to the rigid frame around the corner.
15. The portable computing device of claim 14 , wherein the bond around the corner of the rigid frame prevents the electrolyte or the gasses from escaping the containment structure.
16. The portable computing device of claim 1 , further comprising electrical connector pads, wherein the safety circuitry and the electrical connector pads are integrated into the rigid frame.
17. The portable computing device of claim 1 , further comprising electrical connector pads, wherein the safety circuitry and the electrical connector pads are integrated into a board that is bonded to the rigid frame during assembly.