Nonaqueous electrolyte secondary battery and manufacturing method therefor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakashi Harayama, Ryo Hanasaki
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Abstract
A nonaqueous electrolyte secondary battery includes: an electrode assembly; a nonaqueous electrolyte; and a battery case. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode active material layer. The negative electrode includes a negative electrode active material layer. The separator is interposed between the positive electrode and the negative electrode. The battery case accommodates the electrode assembly and the nonaqueous electrolyte. Ends of contact faces of the negative electrode active material layer and the separator are at least partially bonded to each other.
Claims7
A manufacturing method for a nonaqueous electrolyte secondary battery, comprising:
- constructing a cell by accommodating an electrode assembly in a metal battery case, the electrode assembly including a positive electrode, a negative electrode and a separator, the positive electrode including a positive electrode active material layer, the negative electrode including a negative electrode active material layer, the separator being interposed between the positive electrode and the negative electrode, at least one of the negative electrode active material layer and the separator including a binder;
- after accommodating the electrode assembly in the metal battery case, supplying a nonaqueous electrolyte into the metal battery case;
- and
- after accommodating the electrode assembly in the metal battery case, and in advance of supplying the nonaqueous electrolyte, at least partially bonding ends of contact faces of the negative electrode active material layer and the separator to each other by physical or chemical binding force of the binder, the positive electrode active material layer and the separator being not bonded to each other, the negative electrode and the separator being bonded to each other by heating while applying a pressure such that the ends of the contact faces of the negative electrode active material layer and the separator in the electrode assembly are at least partially pressed via the metal battery case from an outside of the metal battery case.
Dependencies are inferred from the claim text.