Electrical insulation system and method for electrical power storage component separation

• US 7,808,772 B2
• Filed: 09/04/2009
• Issued: 10/05/2010
• Est. Priority Date: 07/11/2005
• Status: Active Grant

• Current Assignee: Greatbatch Limited (Greatbatch Incorporated)
• Original Assignee: Micro Power Electronics, Inc. (Electrochem Solutions, Inc.)
• Inventors: Guzman, Ted, Young, Charlie
• Primary Examiner(s): Ha; Nguyen T
• Application Number:
  US12/554,806
• Publication Number:
  US 20100058575A1
• Time in Patent Office: 396 Days
• Field of Search: 361/502, 361503-504, 361509-512, 361516-519, 429 53- 54, 429/94, 429/99, 429/100
• US Class Current: 361/502
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• 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 50/24 adapted for protecting batteries from their environment, e.g. from corrosion thermal insulation H01M10/658
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

An electrical insulation system and method for electrical power storage component separation is disclosed. Some implementations of the system use various forms of polyurethane elastomer based material such as tapes to electrically separate various components of electrical power storage devices such as battery packs. These components can include cells, connecting tabs, printed circuit assemblies, solder joints, nickel strips, and other conductive members.

Claims

1. A method for manufacturing an electrical storage device having a life, the method comprising:

providing a first storage device component with a first electrically conducting surface portion;

providing a second storage device component with a second electrically conducting surface portion, at least one of the first electrically conducting surface portion and the second electrically conducting surface portion having an unsmooth area;

providing puncture resistant electrical insulating material having a durability;

positioning the first storage device component, the second storage device component, and the insulating material inside the electrical storage device with the insulating material adjacent at least the unsmooth area, the durability of the insulating material being sufficient to resist forces imparted to the insulating material by the unsmooth area to maintain electrical separation between the first electrically conducting surface portion and the second electrically conducting surface portion over the life of the electrical storage device.

2. The method of claim 1 wherein the insulating material is tape.

3. The method of claim 1 wherein the insulating material contains polyurethane.

4. The method of claim 1 wherein the insulating material is a polyurethane elastomer.

5. The method of claim 1 wherein the insulating material has a tensile strength at break of at least approximately 40 pounds per square inch.

6. The method of claim 1 wherein the insulating material has an elongation length at break of at least approximately 400% of an unstressed sample.

7. A method for manufacturing a battery pack having a life, the method comprising:

positioning a battery cell proximate to a circuit, the battery cell including a first portion and a first terminal, the circuit including a conductive first portion and a second portion;

positioning an electrically conductive member proximate to the battery cell and the circuit, the electrically conductive member including a first portion, a second portion, and a third portion, such that the first portion of the electrically conductive member contacts the first terminal of the battery cell and the second portion of the electrically conductive member contacts the conductive first portion of the circuit;

positioning first electrical insulating material between the first portion of the battery cell and the third portion of the electrically conductive member, at least one of the first portion of the battery cell and the third portion of the electrically conductive member including a first unsmooth area, the first electrical insulating material having sufficient durability to maintain electrical separation between the first portion of the battery cell and the third portion of the electrically conductive member over the life of the battery pack; and

positioning second electrical insulating material between the second portion of the circuit and the third portion of the electrically conductive member, at least one of the second portion of the circuit and the third portion of the electrically conductive member having a second unsmooth area, the second electrical insulating material having sufficient durability to maintain electrical separation between the second portion of the circuit and the third portion of the electrically conductive member over the life of the battery pack.

8. The method of claim 7 wherein the battery cell is a first battery cell, the electrically conductive member is a first electrically conductive member, the circuit further includes a conductive third portion and a fourth portion, and wherein the method further comprises:

positioning a second battery cell proximate to the circuit, the second battery cell including a first portion and a first terminal;

positioning a second electrically conductive member proximate to the second battery cell and the circuit, the second electrically conductive member including a first portion, a second portion, and a third portion, such that the first portion of the second electrically conductive member contacts the first terminal of the second battery cell and the second portion of the second electrically conductive member contacts the conductive third portion of the circuit;

positioning third electrical insulating material between the first portion of the second battery cell and the third portion of the second electrically conductive member, at least one of the first portion of the second battery cell and the third portion of the second electrically conductive member including a third unsmooth area, the third electrical insulating material having sufficient durability to maintain electrical separation between the first portion of the second electrical battery cell and the third portion of the second electrically conductive member over the life of the battery pack; and

positioning fourth electrical insulating material between the fourth portion of the circuit and the third portion of the second electrically conductive member, at least one of the fourth portion of the circuit and the third portion of the second electrically conductive member having a fourth unsmooth area, the fourth electrical insulating material having sufficient durability to maintain electrical separation between the fourth portion of the circuit and the third portion of the second electrically conductive member over the life of the battery pack.

9. The method of claim 7 wherein positioning an electrically conductive member includes positioning an electrically conductive member that includes at least one bend that accommodates the conductive first portion of the circuit contacting the second portion of the electrically conductive member.

10. The method of claim 7 wherein the third portion of the electrically conductive member includes multiple bends to accommodate positioning the second electrical insulating material between the second portion of the circuit and the second portion of the electrically conductive member.

11. The method of claim 7 wherein the first portion of the battery cell is a first generally curvilinear exterior surface portion, and wherein positioning first electrical insulating material includes positioning first electrical insulating material that includes a second generally curvilinear exterior surface portion proximate to the first generally curvilinear exterior surface portion.

12. The method of claim 7 wherein positioning second electrical insulating material includes positioning second electrical insulating material that includes a first portion and a second portion generally perpendicular to the first portion.

13. The method of claim 7, further comprising positioning the battery cell, the circuit, the electrically conductive member, the first electrical insulating material and the second electrical insulating material in an interior portion of a housing.

14. The method of claim 7 wherein the first unsmooth area includes at least one of a first abrasive surface, a first sharp edge, and a first protruding member, and wherein the second unsmooth area includes at least one of a second abrasive surface, a second sharp edge, and a second protruding member.

15. The method of claim 7 wherein at least one of the first electrical insulating material and the second electrical insulating material includes polymeric material.

16. The method of claim 7 wherein at least one of the first electrical insulating material and the second electrical insulating material includes tape.

17. A method for manufacturing a battery pack having a life, the method comprising:

forming at least a portion of the battery pack, by—

positioning a first battery pack component proximate to a second battery pack component, the first battery pack component including a first surface portion and the second battery pack component including a second surface portion, at least one of the first battery pack component and the second battery pack component including an unsmooth area; and

positioning puncture resistant insulating material proximate to the unsmooth area, the puncture resistant insulating material having a durability sufficient to resist forces imparted to the puncture resistant insulating material by the unsmooth area to maintain separation between the first surface portion of the first battery pack component and the second surface portion of the second battery pack component over the life of the battery pack.

18. The method of claim 17 wherein the unsmooth area is a first unsmooth area, the puncture resistant insulating material having a durability is first puncture resistant insulating material having a first durability, and wherein forming at least a portion of the battery pack further includes—

positioning a third battery pack component proximate to at least one of the first and second battery pack components, the third battery pack component including a third surface portion, at least one of the second battery pack component and the third battery pack component including a second unsmooth area; and

positioning second puncture resistant insulating material having a second durability proximate to the second unsmooth area, the second durability of the second puncture resistant insulating material being sufficient to resist forces imparted to the second puncture resistant insulating material by the second unsmooth area to maintain separation between the third surface portion of the third battery pack component and the second surface portion of the second battery pack component over the life of the battery pack.

19. The method of claim 17 wherein the first surface portion of the first battery pack component is generally curvilinear, and wherein positioning puncture resistant insulating material includes positioning puncture resistant insulating material having a generally curvilinear surface portion proximate to the generally curvilinear first surface portion.

20. The method of claim 17 wherein the first surface portion of the first battery pack component is a first electrically conducting surface portion, the second surface portion of the second battery pack component is a second electrically conducting surface portion, and wherein positioning puncture resistant insulating material includes positioning puncture resistant electrical insulating material having a durability proximate to the unsmooth area, the durability of the puncture resistant electrical insulating material being sufficient to resist forces imparted to the puncture resistant electrical insulating material by the unsmooth area to maintain electrical separation between the first electrically conducting surface portion and the second electrically conducting surface portion over the life of the battery pack.