SECONDARY BATTERY AND BATTERY PACK
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Aug 28, 2024
filing date -
Aug 28, 2024
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Abstract
A secondary battery includes an electrode wound body and an outer package can containing the electrode wound body. The positive electrode includes a positive electrode current collector and first and second positive electrode active material layers. Each of the first and second positive electrode active material layers includes a first thin part and a first thick part having a thickness greater than that of the first thin part and being adjacent to the first thin part in a longitudinal direction. A position of a first border between the first thin part of the first positive electrode active material layer and the first thick part of the first positive electrode active material layer and a position of a second border between the first thin part of the second positive electrode active material layer and the first thick part of the second positive electrode active material layer are different from each other.
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