초록 ▼

The present invention provides a new process for attaching the anode lead to the battery case, creating a case negative design. The anode lead is an extension of the anode current collector and is nested between the case and the lid. Excess lead material is ground or cut off and the case to lid seal

The present invention provides a new process for attaching the anode lead to the battery case, creating a case negative design. The anode lead is an extension of the anode current collector and is nested between the case and the lid. Excess lead material is ground or cut off and the case to lid seal is achieved by laser/electron beam welding. The new procedure enhances the hermicity of the cell and the new process is applicable to a number of additional applications. This includes primary lithium batteries, implantable batteries, lithium based rechargeable cells, also acid or alkaline based batteries.

대표청구항 ▼

1. An electrochemical cell comprising a) a casing of an electrically conductive material and having an open end; b) a first electrode comprising a first electrode active material contacted to a first current collector; c) a second electrode comprising a second electrode active material contacte

1. An electrochemical cell comprising a) a casing of an electrically conductive material and having an open end; b) a first electrode comprising a first electrode active material contacted to a first current collector; c) a second electrode comprising a second electrode active material contacted to a second current collector; d) a terminal lead insulated from the casing and connected to one of the first and second current collectors; e) a conductive extension connected to the other of the first and second current collectors; f) an electrolyte activating the first and second electrodes; and g) a lid of an electrically conductive material closing the open end of the casing, wherein the conductive extension is trapped between the lid and the casing, and the lid is sealed to the casing to close the open end thereof. 2. The electrochemical cell of claim 1 wherein the conductive extension is flush with the lid sealed to the casing. 3. The electrochemical cell of claim 1 wherein the conductive extension is a plate-shaped member or a cylindrical-shaped member. 4. The electrochemical cell of claim 1 wherein the conductive extension is at least one selected from the group consisting of strap, triangular and hexagonal shapes. 5. The electrochemical cell of claim 1 wherein the first and second electrodes are electrically associated with each other in either a jellyroll configuration or in a prismatic configuration. 6. The electrochemical cell of claim 1 wherein the casing is selected from the group consisting of clam shell, prismatic, cylindrical and button casings. 7. The electrochemical cell of claim 1 wherein the casing, lid and conductive extension are of at least one selected from the group consisting of stain less steel, nickel, titanium and aluminum. 8. The electrochemical cell according to claim 1, wherein the lid and the casing containing the conductive extension are sealed by welding using a laser beam. 9. The electrochemical cell according to claim 1 wherein the lid and the casing containing the conductive extension are sealed by welding using an electron beam welder. 10. The electrochemical cell of claim 1 as a primary cell and the cathode active material is selected from the group consisting of silver vanadium oxide, copper silver vanadium oxide, manganese dioxide, cobalt oxide, nickel oxide, copper oxide, copper sulfide, iron sulfide, iron disulfide, titanium disulfide, copper vanadium oxide, and mixtures thereof. 11. The electrochemical cell of claim 1 as a secondary cell and the cathode active material is selected from the group consisting of oxides, sulfides, selenides, and tellurides of metals selected from the group consisting of vanadium, titanium, chromium, copper, molybdenum, niobium, iron, nickel, cobalt and manganese. 12. The electrochemical cell of claim 1 as a secondary cell and the anode material is selected from the group consisting of coke, graphite, acetylene black, carbon black, glassy carbon, hairy carbon, and mixtures thereof. 13. The electrochemical cell of claim 1 associated with an implantable medical device powered by the cell.