BATTERY PACK PROTECTION SYSTEM

• US 20120225331A1
• Filed: 03/02/2011
• Published: 09/06/2012
• Est. Priority Date: 03/02/2011
• Status: Abandoned Application

• Current Assignee: Lithionics LLC
• Original Assignee: Lithionics LLC
• Inventors: Tartaglia, Steven
• Application Number:
  US13/038,976
• Publication Number:
  US 20120225331A1
• Time in Patent Office: Days
• US Class Current: 429/50
• CPC Class Codes: H01M 2200/00 Safety devices for primary or secondary batteries
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/222 Inorganic material
• CPC Class Codes: H01M 50/227 Organic material
• CPC Class Codes: H01M 50/229 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/231 having a layered structure
• CPC Class Codes: H01M 50/233 characterised by physical properties of casings or racks, e.g. dimensions
• CPC Class Codes: H01M 50/24 adapted for protecting batteries from their environment, e.g. from corrosion thermal insulation H01M10/658
• CPC Class Codes: H01M 50/296 characterised by terminals of battery packs terminals of batteries H01M50/543
• CPC Class Codes: H01M 50/298 characterised by the wiring of battery packs
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An application for a battery pack that includes walls made of sturdy material, power interface terminals and battery cells/electronics held within the walls. A protective layer contains the battery cells. The protective layer reduces external harm from heat, out-gassing and/or explosion of one or more of the battery cells.

Claims

1. A battery pack comprising:

an enclosure;

one or more battery cells held within the enclosure;

a protective layer disposed within the enclosure and encapsulating the battery cells;

a connection terminal electrically accessible from outside of the enclosure; and

two or more conductors, each conductor electrically connecting a contact of the connection terminal with a terminal of one or more of the battery cells;

whereas the protective layer contains excess heat and forces created when one or more of the battery cells overheat, vent or explode.

2. The battery pack of claim 1, wherein the one or more battery cells is two or more battery cells and the battery pack further comprises interconnecting conductive paths, each interconnecting conductive path connecting battery terminals of the batteries in series, parallel or series-parallel.

3. The battery pack of claim 1, wherein the protective layer is a high-temperature, woven cloth material.

4. The battery pack of claim 3, wherein the high temperature, woven cloth material is coated with a polymer.

5. The battery pack of claim 4, wherein the polymer is selected from the group consisting of silicone, PTFE, urethane, neoprene, and fluroelastomers.

6. The battery pack of claim 4, wherein the woven cloth material is a glass based fabric.

7. The battery pack of claim 1, further comprising a dampening layer, the dampening layer disposed between the enclosure and the protective layer.

8. The battery pack of claim 2, further comprising an electrical insulation layer, the electrical insulation layer covering the battery cells and the interconnecting conductive paths, the electrical insulation layer comprising one or more sheets of fire-retardant paper/cardboard covering at least the interconnecting conductive layers, the electrical insulation layer comprising a shrink-wrap layer covering the fire-retardant paper/cardboard, the interconnecting conductive layers and the battery cells.

9. The battery pack of claim 8, wherein the electrical insulation layer is polyolefin.

10. The battery pack of claim 1, wherein the enclosure is made of plastic.

11. The battery pack of claim 8, wherein the enclosure is made of carbon filed plastic.

12. The battery pack of claim 11, wherein an inside wall of the enclosure is coated with fiberglass.

13. A method of reducing battery cell failure during heat sterilization, the method comprising:

providing two or more battery cells;

surrounding the battery cells in a protective layer;

electrically connecting the battery cells to connection terminals by a plurality of interconnecting conductive paths, the interconnecting conductive paths passing through the protective layer; and

enclosing the battery cells and the protective layer in an enclosure, the enclosure having connection terminals, the connection terminals electrically interfaced to the battery cells by the conductive paths, thereby providing power accessible from outside of the enclosure;

whereas the protective layer reduces external harm from heat, out-gassing and/or explosion of one or more of the battery cells.

14. The method of claim 13, wherein the protective layer is a high-temperature, woven cloth material.

15. The method of claim 14, wherein the high temperature, woven cloth material is coated with a polymer.

16. The method of claim 15, wherein the polymer is selected from the group consisting of silicone, PTFE, urethane, neoprene, and fluroelastomers.

17. The method of claim 14, wherein the woven cloth material is a glass based fabric.

18. The method of claim 13, further comprising providing a dampening layer, the dampening layer disposed between the enclosure and the protective layer.

19. The method of claim 13, further comprising providing an electrical insulation layer, the electrical insulation layer covering the battery cells and the interconnecting conductive paths, the electrical insulation layer comprising one or more sheets of fire-retardant paper/cardboard covering at least the interconnecting conductive layers, the electrical insulation layer comprising a shrink-wrap layer covering the fire-retardant paper/cardboard, the interconnecting conductive layers and the battery cells.

20. A battery pack comprising:

an enclosure;

one or more battery cells held within the enclosure;

a protective layer disposed within the enclosure and encapsulating the battery cells;

connection terminals electrically accessible from outside of the enclosure and electrically accessible from inside of the enclosure, the terminals conducting electricity through the enclosure;

two or more conductors, each conductor electrically connecting a contact of the connection terminal with a terminal of one or more of the battery cells or connecting the terminal of one or more of the battery cells with another terminal of one or more of the battery cells; and

a dampening layer, the dampening layer disposed between the protective layer and the enclosure;

whereas the protective layer contains excess heat and forces created when one or more of the battery cells overheat, vent or explode and the dampening layer reduces vibration and rattle of the battery cells within the enclosure.