Battery cell and method of manufacturing same
AssigneePrime Planet Energy & Solutions, Inc.
InventorsHiromasa Nishijima, Tomokazu Yamanaka, Yoshitaka Matsumasa
Life of this patent
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Abstract
A battery cell includes: a case including a main body provided with an opening, and a sealing plate that seals the main body; an electrode assembly accommodated in the case and having an electrode tab; and a current collector joined to the electrode tabs. The electrode tab has a stacking structure of metal foils, and a plurality of burring-processed portions along a stacking direction of the metal foils are formed in the electrode tab. A laser-welded portion that joins the electrode tab and the current collector is formed at least in a region located between the plurality of burring-processed portions or at least in a region adjacent to the plurality of burring-processed portions.
Claims17
A battery cell comprising:
- a case including a main body provided with an opening, and a sealing plate that seals the main body;
- an electrode terminal on an outer surface of the sealing plate;
- an electrode assembly accommodated in the case and having an electrode tab;
- and
- a current collector joined to the electrode tab, wherein the electrode tab has a stacking structure of metal foils, and the electrode tab and the electrode terminal are electrically connected through the current collector;
- a plurality of burring-processed portions along a stacking direction of the metal foils are formed in the electrode tab, wherein each of the plurality of burring-processed portions comprises a recess with a bottom in the electrode tab;
- and
- a laser-welded portion that joins the electrode tab and the current collector is formed at least in a region located between the plurality of burring-processed portions or at least in a region adjacent to the plurality of burring-processed portions.
A method of manufacturing a battery cell, the method comprising:
- producing an electrode assembly including an electrode tab having a stacking structure of metal foils;
- placing a current collector on the electrode tab;
- performing a burring process onto the electrode tab at a first position and a second position separated from each other, along a stacking direction of the metal foils, wherein the burring process defines a plurality of recesses, and each of the plurality of recesses comprises a bottom in the electrode tab;
- joining the electrode tab and the current collector by laser welding at least in a region located between the first position and the second position or at least in a region adjacent to the first position and the second position;
- accommodating the electrode assembly and the current collector in a case body after joining the electrode tab and the current collector;
- and
- sealing, with a sealing plate, the case body in which the electrode assembly and the current collector are accommodated, wherein an electrode terminal is on an outer surface of the sealing plate, and the electrode terminal is electrically connected to the electrode tab through the current collector.
Dependencies are inferred from the claim text.