Battery assembly

• US 4,049,882 A
• Filed: 02/11/1976
• Issued: 09/20/1977
• Est. Priority Date: 02/11/1976
• Status: Expired due to Term

• Current Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Beatty, Theodore Robert
• Primary Examiner(s): LeFevour, C. F.
• Application Number:
  US05/657,204
• Time in Patent Office: 587 Days
• Field of Search: 136/13, 136/14, 136/134 R, 136/134 P, 136/135 R, 136/135 S, 136/120 R, 429/94, 429/133-135, 429/136, 429/164-170, 429/178-184, 429/140, 429/141
• US Class Current: 429/94
• CPC Class Codes: H01M 50/536 characterised by the method of fixing the leads to the electrodes, e.g. by welding
• CPC Class Codes: H01M 50/538 Connection of several leads or tabs of wound or folded electrode stacks
• CPC Class Codes: H01M 6/10 with wound or folded electrodes

Abstract

The battery assembly incorporates a mechanical tab connection which has a multiplicity of projections for penetrating an electrode to form a mechanical joint and for simultaneously establishing electrical contact with the electrode through such joint.

Claims

1. In a cylindrical battery assembly, including at least one galvanic cell enclosed within an outer housing having a positive and negative battery terminal and a supply of electrolyte, comprising:

a strip of negative electrode material composed of a conductive metal and electrochemically active material;

a strip of positive electrode material;

a porous separating member for maintaining the positive and negative electrode strips spaced from one another, with the strip of positive and negative electrode material being spirally wound in combination with said porous separating member into a cylindrical form; and

means for electrically coupling said positive and negative strip of electrode material to the corresponding positive and negative terminal of said outer housing, the improvement comprising;

wherein said means for electrically coupling at least said negative strip of electrode material to its corresponding housing terminal comprises at least one conductive element having a multiplicity of projections which penetrate into said electrode for mechanically joining said element to said electrode and for simultaneously establishing electrical contact with said conductive metal in said strip of negative electrode through the mechanical points of contact provided by said projections.

2. In a battery assembly as defined in claim 1 wherein said conductive element has a planar surface from which said multiplicity of projections extend.

3. In a battery system as defined in claim 2 wherein said porous separating member is in the form of a sheath surrounding said negative strip of electrode material and wherein said conductive element is disposed in abutting relation against said sheath with its multiplicity of projections extending through said sheath.

4. In a battery assembly as defined in claim 3 wherein said conductive element is a relatively thin tab of conductive material compatible with the electrochemical system of said battery assembly and further comprises a multiplicity of perforations formed upon one surface thereof, with said multiplicity of projections representing the jagged edges protruding from each of said multiplicity of perforations respectively.

5. In a battery system as defined in claim 4 wherein said multiplicity of perforations are arranged within a first predetermined section of said tab of conductive material.

6. In a battery system as defined in claim 5 comprising another multiplicity of perforations arranged within a second predetermined section of said tab of conductive material.

7. In a battery assembly as defined in claim 4 further comprising a plurality of said conductive elements arranged in tandem along the longitudinal axis of said negative strip of electrode material.

8. In a battery system as defined in claim 5 further comprising an insulating layer mounted over at least said first predetermined section of said strip of conductive material.