Secondary battery and saw device
The SAW device addresses rapid charging issues in secondary batteries by forming a uniform electrolyte flow field, enhancing charging efficiency and safety through uniform acoustic wave application, thus preventing dendrite formation and ensuring battery longevity.
WO2026134683A1PCT designated stage Publication Date: 2026-06-25LG ENERGY SOLUTION LTD +1
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-11-12
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Rapid charging of secondary batteries leads to ion concentration gradients, dendrite formation, lithium plating, and safety risks due to uneven electrolyte flow and high C-Rate states, causing capacity degradation and shortening of battery lifespan.
Method used
A SAW device attached to the battery case generates acoustic waves to form a uniform electrolyte flow field, reducing ion concentration gradients and suppressing dendrite formation, using a piezoelectric substrate with IDT electrode sets to apply acoustic waves uniformly across the battery surface.
Benefits of technology
Enhances charging efficiency and safety by maintaining a stable High C-Rate state, preventing capacity degradation and short circuits, and ensuring the longevity of secondary batteries.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure KR2025018621_25062026_PF_FP_ABST
Abstract
A secondary battery according to the present invention comprises: an electrode assembly; a battery case; and a SAW device which is attached to the outer surface of the battery case and generates SAWs to apply acoustic waves to the battery case. The SAW device comprises: a piezoelectric substrate having piezoelectricity; and an IDT electrode set for generating SAWs in response to electrical signals. The IDT electrode set comprises: a plurality of IDT electrode units which are arranged side-by-side along a first direction on the piezoelectric substrate and generate SAWs in response to electrical signals; and a signal receiving unit which receives the electrical signals and transmits the electrical signals to the IDT electrode units. The IDT electrode units include a pair of a first IDT electrode and a second IDT electrode that face each other. The signal receiving unit comprises: a first signal receiving unit which transmits the electrical signals to each of the plurality of first IDT electrodes; and a second signal receiving unit which transmits the electrical signals to each of the plurality of second IDT electrodes. In the IDT electrode set, the first signal receiving unit, the plurality of IDT electrode units, and the second signal receiving unit are sequentially arranged side-by-side along the first direction.
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