Flexible Solid-State Battery FlexPower Deep Dive: A Wearable Battery That Maintains 95% Capacity After 10,000 Bends

Flexible Solid-State Battery FlexPower Deep Dive: A Wearable Battery That Maintains 95% Capacity After 10,000 Bends

In early April 2029, Samsung SDI unveiled FlexPower in Seoul, a flexible solid-state battery just 0.8mm thick that bends like paper, maintaining 95% of its initial capacity after 10,000 bend cycles. Energy density reaches 450Wh/kg—nearly double that of current mainstream lithium-polymer batteries.

FlexPower's technical breakthrough comes from Samsung SDI's "sandwich" solid-state electrolyte structure. Traditional solid-state batteries use a single ceramic electrolyte layer that develops micro-cracks under bending. FlexPower employs a three-layer composite—two flexible sulfide electrolyte layers sandwiching an elastic polymer buffer layer—allowing the layers to slide relative to each other during bending, preventing stress concentration.

In safety tests, FlexPower withstood puncture, high-temperature, and compression extremes without thermal runaway. Samsung SDI Battery Research Institute director Kim Joon-ho stated: "Solid-state electrolytes fundamentally eliminate the risk of liquid electrolyte leakage and combustion. Even if you cut FlexPower with scissors, it won't catch fire."

First products featuring FlexPower include the Samsung Galaxy Ring 2 and Garmin's flexible sports band. Galaxy Ring 2's battery life improved from 5 days to 12 days with only 0.3 grams of added weight.

Industry analysts note that FlexPower's real impact lies in enabling "battery as structural component" design philosophy. When batteries can bend, be cut, and integrate with flexible circuit boards, wearable device industrial design gains unprecedented freedom.

However, FlexPower's production cost remains high. Samsung SDI reveals the current cost is approximately $380 per kilowatt-hour—1.8 times that of traditional lithium batteries. The company targets sub-$200 by 2030.