CONTROLLED PRESSURE RELEASE FOR PACKAGED BATTERIES AND ASSOCIATED SYSTEMS AND METHODS

• US 20090047572A1
• Filed: 08/18/2008
• Published: 02/19/2009
• Est. Priority Date: 08/16/2007
• Status: Abandoned Application

• Current Assignee: Micro Power Electronics, Inc. (Electrochem Solutions, Inc.)
• Original Assignee: Micro Power Electronics, Inc. (Electrochem Solutions, Inc.)
• Inventors: Pynenburg, Rory, Van Zwol, Jeff
• Application Number:
  US12/193,481
• Publication Number:
  US 20090047572A1
• Time in Patent Office: Days
• US Class Current: 429/100
• CPC Class Codes: H01M 50/202 Casings or frames around the primary casing of a single cell or a single battery
• CPC Class Codes: H01M 50/204 Racks, modules or packs for multiple batteries or multiple cells
• CPC Class Codes: H01M 50/227 Organic material
• CPC Class Codes: H01M 50/233 characterised by physical properties of casings or racks, e.g. dimensions
• CPC Class Codes: H01M 50/3425 in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

A battery package for providing power to an electronic device is described herein. In one embodiment, the battery package includes a casing configured to enclose at least one battery cell. The casing includes a wall having an internal surface, an external surface and a dimple. The dimple extends outward from the internal surface to an intermediate section of the wall. In a particular embodiment, the dimple is positioned to rupture under high pressure conditions and direct escaping gases away from selected components of the electronic device in which the battery package is housed.

Claims

1. A battery package for providing power to an electronic device, the battery package comprising a casing configured to enclose at least one battery cell, wherein the casing includes a wall having an internal surface, an external surface and a dimple extending outward from the internal surface to an intermediate section of the wall.

2. The battery package of claim 1 wherein the dimple is not visible from the external surface.

3. The battery package of claim 1 wherein the electronic device has an electronic component, and wherein the dimple extends outward in a direction generally facing away from the electronic component.

4. The battery package of claim 1 wherein the dimple is generally cylindrical.

5. The battery package of claim 1 wherein the wall has a thickness of approximately 0.04 inches to approximately 0.06 inches and the dimple has a depth of approximately 0.005 inches to approximately 0.03 inches.

6. The battery package of claim 1 wherein the casing forms an internal volume, the wall has a thickness, the dimple has a depth and a cross-sectional dimension, and wherein at least one of the depth and the cross-sectional dimension are determined based at least partially upon at least one of the internal volume and the wall thickness.

7. The battery package of claim 1 wherein the dimple is a first dimple extending from a first portion of the internal surface to a first intermediate section of the wall, and wherein the casing further includes a second dimple extending from a second portion of the internal surface to a second intermediate section of the wall.

8. The battery package of claim 7 wherein the first and second dimples are proximate to each other.

9. The battery package of claim 1 wherein the wall is a first wall having a first internal surface, a first external surface and a first dimple extending from the first internal surface to a first intermediate section of the first wall, and wherein the casing further includes a second wall having a second internal surface, a second external surface and a second dimple extending from the second internal surface to a second intermediate section of the second wall.

10. The battery package of claim 9 wherein the first and second walls are adjacent to each other.

11. The battery package of claim 1 wherein the dimple includes a sidewall diverging outward from the internal surface to the intermediate section.

12. The battery package of claim 1 wherein the intermediate section is a first intermediate section, and wherein the dimple has a base having a sidewall converging inward from the intermediate section to a second intermediate section of the wall.

13. The battery package of claim 1 wherein the dimple includes at least two sidewalls converging outward from the internal surface to the intermediate section of the wall.

14. A casing for housing at least one battery cell, the casing comprising walls forming an interior space, at least one wall including at least one opening, and a cavity including a sidewall extending outward from the at least one opening to an intermediate section of the at least one wall, wherein the portion of the at least one wall from the intermediate section to an external surface of the casing is configured to rupture when the interior space is subjected to an elevated internal pressure.

15. The casing of claim 14, wherein the sidewall diverges rearward from the at least one opening to the intermediate section of the at least one wall.

16. An electronic device, comprising:

a housing;

an electronic component positioned within the housing; and

a battery package positioned within the housing and electrically coupled to the electronic component, the battery package including a casing enclosing at least one battery cell, wherein the casing includes a wall having an internal surface, an external surface and a dimple extending outward from the internal surface to an intermediate section of the wall, and wherein the dimple extends outward in a direction generally facing away from the electronic component.

17. The electronic device of claim 16, wherein 7 the dimple includes a sidewall diverging outward from the internal surface to the intermediate section

18. A method for manufacturing a battery package casing, the method comprising:

forming at least one blind hole at an interior surface of the battery package casing, wherein the blind hole extends from the interior surface to an intermediate section of the battery package casing;

disposing a battery cell within the battery package casing; and

sealing the battery package casing.

19. The method of claim 18, wherein the blind hole has a depth and a cross-sectional dimension, and wherein forming the at least one blind hole at the interior surface of the battery package casing includes forming the depth and the cross-sectional dimension of the blind hole so as to cause the portion of the battery package casing from the intermediate section to an exterior surface of the battery package casing to rupture when an interior pressure of the battery package casing reaches a preselected pressure.

20. The method of claim 18, further comprising forming the battery package casing, and wherein forming the at least one blind hole at the interior surface of the battery package casing includes forming the at least one blind hole at the interior surface of the battery package casing concurrently with forming the battery package casing.

21. The method of claim 18, further comprising forming the battery package casing, and wherein forming the at least one blind hole at the interior surface of the battery package casing includes removing material from the battery package casing to form the at least one blind hole.

22. The method of claim 18, further comprising forming the battery package casing, and wherein forming the at least one blind hole at the interior surface of the battery package casing includes forming the at least one blind hole without removing material from the battery package casing.

23. The method of claim 18, wherein the blind hole has a depth and a cross-sectional dimension, wherein the portion of the battery package casing between the intermediate section of the wall and an external surface of the battery package casing has a strength, and wherein forming the at least one blind hole at the interior surface of the battery package casing includes selecting at least one of the blind hole depth and the blind hole cross-sectional dimension based at least partially upon an inverse relationship to the strength of the portion of the battery package casing between the intermediate section of the wall and an external surface of the battery package casing.

24. A method for utilizing a battery package casing, the method comprising:

providing a casing having at least one blind hole disposed at an interior surface of the casing, wherein the casing houses a battery; and

equalizing a battery-induced pressure accumulation in the casing by rupturing the casing at the blind hole.

25. The method of claim 24 wherein providing a casing having at least one blind hole includes providing a casing having a blind hole having dimensions configured so as to cause the casing at the blind hole to be the first portion of the casing to rupture when equalizing a battery-induced pressure accumulation in the casing.

26. The method of claim 24 wherein providing a casing having at least one blind hole includes providing a casing having a blind hole having a sidewall diverging from the interior surface to an intermediate section of the casing, and wherein equalizing a battery-induced pressure accumulation in the casing includes expelling accumulated gases in the casing along the diverging sidewall and through the rupture in the casing at the blind hole.

27. The method of claim 24, wherein equalizing a battery-induced pressure accumulation in the casing by rupturing the casing at the blind hole includes preferentially directing accumulated gases in the casing through the rupture in the casing at the blind hole and away from an electronic component of an electronic device to which the battery package casing is operably coupled.