Increasing the stiffness of battery cells for portable electronic devices
AssigneeApple Inc.
InventorsRamesh C. Bhardwaj, Sheba Devan, Taisup Hwang
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Abstract
The disclosed embodiments relate to the manufacture of a battery cell. The battery cell includes a set of layers including a cathode with an active coating, a separator, and an anode with an active coating. The battery cell also includes a pouch enclosing the layers, wherein the pouch is flexible. The layers may be wound to create a jelly roll prior to sealing the layers in the flexible pouch. The stiffness of the battery cell may be increased by applying a pressure of at least 0.13 kilogram-force (kgf) per square millimeter and a temperature of about 85° C. to the layers.
Claims25
A method for manufacturing a battery cell, comprising:
- obtaining a set of layers for the battery cell, wherein the set of layers comprises a cathode with an active coating, a separator, and an anode with an active coating;
- sealing the layers in a pouch to form the battery cell, wherein the pouch is flexible;
- and
- increasing a stiffness of the battery cell by applying a pressure of at least 0.13 kilogram-force (kgf) per square millimeter and a temperature of about 85° C. to the layers.
A battery cell, comprising:
- a set of layers comprising a cathode with an active coating, a separator, and an anode with an active coating;
- and
- a pouch enclosing the layers, wherein the pouch is flexible,
- wherein a stiffness of the battery cell is increased by applying a pressure of at least 0.13 kilogram-force (kgf) per square millimeter and a temperature of about 85° C. to the layers.
A portable electronic device, comprising:
- a set of components powered by a battery pack;
- and
- the battery pack, comprising:
- a battery cell, comprising:
- a set of layers comprising a cathode with an active coating, a separator, and an anode with an active coating;
- and
- a pouch enclosing the layers, wherein the pouch is flexible,
- wherein a stiffness of the battery cell is increased by applying a pressure of at least 0.13 kilogram-force (kgf) per square millimeter and a temperature of about 85° C. to the layers.
Dependencies are inferred from the claim text.