Battery safety features
View Patent ↗The invention broadly provides improved safety features for batteries utilized in electronic devices. The invention provides an improved CID design that allows for more reliable disconnection (breaking the electrical circuit) during abnormal pressure or temperature events inside the cell. The invention provides a multi-layered CID configured to force electric current through a thin, fragile element such that the thin, fragile element is broken upon any abnormal pressure and temperature event.
1. An apparatus comprising:
a battery operable device; and
a battery cell which provides power to the battery operable device, the battery cell comprising:
a current interrupt device comprising insulating layers interspersed between conducting layers; said insulating layers being configured to restrict an electric current through a fragile element configured to traverse at least one bursting disc fracture point;
wherein the current interrupt device further comprises:
a bottom conducting layer;
a first insulating layer disposed on said bottom conducting layer and having a current continuity hole therein; and
a middle conducting layer disposed on said first insulating layer and beneath a second insulating layer and forming the fragile element, wherein the middle conducting layer and the bottom conducting layer are electrically connected via the current continuity hole;
said second insulating layer configured to restrict the electric current through the fragile element.
2. The apparatus according to claim 1 , wherein the current interrupt device further comprises:
a top conductive layer disposed on said second insulating layer and being electrically connected to an outer terminal of the battery cell, wherein the top conducting layer and the middle conducting layer are electrically connected via the fragile element.
3. The apparatus according to claim 1 , wherein the fragile element comprises a film of electrically conductive metal disposed between insulating layers.
4. The apparatus according to claim 1 , wherein the insulating layers comprise insulating tape.
5. The apparatus according to claim 4 , wherein the fragile element is configured such that after a bursting disc bursts at one of the plurality of bursting disc fracture points, an electric circuit is broken.
6. The apparatus according to claim 1 , wherein said battery operable device comprises a physical computing device;
said physical computing device comprising a main memory;
said battery cell configured to provide power to said main memory.
7. The apparatus according to claim 1 , wherein said apparatus comprises an automobile;
said battery operable device comprises an electric motor which propels motion of said automobile;
said battery cell acting to provide power to said electric motor.
8. An apparatus comprising:
a battery cell, the battery cell comprising:
a current interrupt device comprising insulating layers interspersed between conducting layers; said insulating layers being configured to restrict an electric current through a fragile element configured to traverse at least one bursting disc fracture point;
wherein the current interrupt device further comprises:
a bottom conducting layer;
a first insulating layer disposed on said bottom conducting layer and having a current continuity hole therein; and
a middle conducting layer disposed on said first insulating layer and beneath a second insulating layer and forming the fragile element, wherein the middle conducting layer and the bottom conducting layer are electrically connected via the current continuity hole;
said second insulating layer configured to restrict the electric current through the fragile element.
9. The apparatus according to claim 8 , wherein the current interrupt device further comprises:
a top conductive layer disposed on said second insulating layer and being electrically connected to an outer terminal of the battery cell, wherein the top conducting layer and the middle conducting layer are electrically connected via the fragile element.
10. The apparatus according to claim 8 , wherein the fragile element comprises a film of electrically conductive metal disposed between insulating layers.
11. The apparatus according to claim 8 , wherein the fragile element is configured such that after a bursting disc bursts at one of the plurality of bursting disc fracture points, an electric circuit is broken.
12. The apparatus according to claim 8 , wherein the fragile element is configured such that after a bursting disc bursts at one of the plurality of bursting disc fracture points, an electric circuit is broken.
13. An apparatus comprising:
a battery powered component; and
a battery cell configured to provide power to the battery powered component, the battery cell comprising:
a multi-layered current interrupt device having insulating layers interspersed between conducting layers; said insulating layers configured to restrict electric current through a fragile element configured to ensure an electric circuit is broken in response to an abnormal pressure event;
wherein the multi-layered current interrupt device further comprises:
a bottom conducting layer;
a first insulating layer disposed on said bottom conducting layer and having a current continuity hole therein; and
a middle conducting layer disposed on said first insulating layer and beneath a second insulating layer and forming the fragile element, wherein the middle conducting layer and the bottom conducting layer are electrically connected via the current continuity hole;
said second insulating layer configured to restrict the electric current through the fragile element.
14. The apparatus according to claim 13 , wherein a bursting disk of the battery cell is configured to break the fragile element in response to the abnormal pressure event.