COIN-SHAPED SECONDARY BATTERY

• Main Authors: YURA, Yukinobu, MAEDA, Kazuki, URAKAWA, Akira
• Format: Patent
• Language: English; French; German
• Published: 08.09.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A coin-type secondary cell (1) for soldering by reflow method includes a porous positive electrode (2), a porous negative electrode (3), a porous separator (41) provided between the positive electrode (2) and the negative electrode (3), an electrolytic solution (42) with which the positive electrode (2), the negative electrode (3), and the separator (41) are impregnated, and a cell case (5) having an enclosed space in which the positive electrode (2), the negative electrode (3), the separator (41), and the electrolytic solution (42) are housed. A value obtained by dividing the amount of the electrolytic solution (42) by the sum of the amounts of voids in the positive electrode (2), the negative electrode (3), and the separator (41) ranges from 1.025 to 2.4. Accordingly, it is possible to achieve the coin-type secondary cell (1) with high performance and reduced deterioration of performance caused by reflow soldering.