Black core soft break
1. Section status: the periphery of the electrode section is flat, and the middle circle is protruding or descending.
2. Others: The electrode sinters slowly, and the others are normal.
3. Reason analysis: the electrode sintering is slow, the sintered center around the electrode of the holder is not sintered, and the sintered electrode has a low strength, and it is easy to break when it is impacted by a large external force.
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