Secondary battery and method for manufacturing same
AssigneeSanyo Electric Co., Ltd.
InventorHiroshi Takabayashi
Life of this patent
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Abstract
A method of manufacturing a secondary battery including a joining step of clamping a negative electrode core body stacked part and a negative electrode current collector by a horn and an anvil, and in a state where the anvil is in contact with the negative electrode current collector, ultrasonically joining the negative electrode core body stacked part and the negative electrode current collector to form a joint part; and an oxidation treatment step of oxidizing a portion, in contact with the anvil, of the negative electrode current collector in the joining step.
Claims8
A method of manufacturing a secondary battery including:
- a first electrode plate,
- a second electrode plate having a polarity different from a polarity of the first electrode plate,
- an electrode body including the first electrode plate and the second electrode plate, and
- a first electrode current collector which is made of copper or copper alloy, and electrically connected to the first electrode plate,
- wherein the first electrode plate has a first electrode core body made of copper or copper alloy, and a first electrode active material layer formed on the first electrode core body,
- the electrode body has a first electrode core body stacked part in which the first electrode core body is stacked, and
- the first electrode core body stacked part is joined to the first electrode current collector,
- the method comprising:
- a joining step of clamping the first electrode core body stacked part and the first electrode current collector by a horn and an anvil, and in a state where the anvil is in contact with the first electrode current collector, ultrasonically joining the first electrode core body stacked part and the first electrode current collector to form a joint part;
- and
- an oxidation treatment step of oxidizing a portion, in contact with the anvil, of the first electrode current collector in the joining step.
A secondary battery comprising:
- a first electrode plate;
- a second electrode plate having a polarity different from a polarity of the first electrode plate;
- an electrode body including the first electrode plate and the second electrode plate;
- and
- a first electrode current collector which is made of copper or copper alloy, and electrically connected to the first electrode plate,
- wherein the first electrode plate has a first electrode core body made of copper or copper alloy, and a first electrode active material layer formed on the first electrode core body,
- the electrode body has a first electrode core body stacked part in which the first electrode core body is stacked, and
- the first electrode core body stacked part is joined to the first electrode current collector,
- wherein an irregularities formed part is formed on a surface of the first electrode current collector on an opposite side of a surface joined to the first electrode core body stacked part,
- a layer composed of a copper compound containing divalent copper is formed on a surface of the irregularities formed part, and
- a thickness of the layer composed of the copper compound containing divalent copper is greater than a thickness of an oxidized film formed on a surface of a portion of the first electrode current collector, the portion being at a position away from the irregularities formed part.
Dependencies are inferred from the claim text.