Battery Jelly Roll Stepped Groove for Tab Thickness Compensation
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Solution Overview
Problem
The thickness difference between electrode tab positions and non-electrode-tab positions in jelly rolls of batteries leads to uneven pressure, gaps in the interface bonding area, and lithium precipitation, affecting cycling performance and safety.
Innovation Solution
A jelly roll design with a stepped groove on the second electrode plate and a termination adhesive tape that accommodates the first electrode tab and its winding tail end within the groove, reducing thickness differences and improving flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode tab structure is centered during winding, then the winding process is simplified, but the flatness of the jelly roll decreases due to thickness difference between electrode tab positions and non-electrode-tab positions
Solution Approach 1:
The patent introduces a stepped groove structure at the electrode tab position on the second electrode plate, creating local structural variation. This stepped groove accommodates the thicker electrode tab region, allowing the winding to proceed centrally while maintaining overall flatness by providing local thickness compensation.
2Ease of manufacture
If the electrode tab structure is centered during winding, then the manufacturing process is easier, but uneven pressure is generated near electrode tabs during formation, causing gaps in the interface bonding area
Solution Approach 1:
The stepped groove structure creates local structural variation at the electrode tab position, providing thickness compensation that ensures uniform pressure distribution during formation. This prevents gaps in the interface bonding area while maintaining the simplified centered winding process.
3Ease of manufacture
If the electrode tab structure is centered during winding, then the winding process is simplified, but lithium precipitation occurs at the electrode tab positions, affecting battery performance and safety
Solution Approach 1:
The stepped groove structure provides local thickness compensation at the electrode tab position, ensuring uniform pressure distribution during formation. This prevents lithium precipitation at the electrode tab positions while maintaining the simplified centered winding process, thereby improving battery safety and performance.
Data Source
AI summary
The present disclosure provides a jelly roll and a battery. The jelly roll comprises a first electrode plate with a first electrode tab, a separator, and a second electrode plate with a stepped groove opposite to the electrode tab. The stepped groove comprises a first groove and a second groove that are arranged away from the first electrode tab and are in communication in sequence. A projection of the second groove is located within that of the first groove. An active layer ending portion and a termination adhesive tape are provided on one side of a winding tail end of the first electrode plate, which side faces toward the second electrode plate. A head portion of the termination adhesive tape covers the active layer ending portion. Both the head portion of the termination adhesive tape and the active layer ending portion are located in the second groove.