FLEX Stacked Lithium—Power That Changes Everything

FLEX Stacked Lithium—Power That Changes Everything

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A Look into the Future: Stacked Batteries in iPhone 15

Editorial: StackedCell-Grepow

Issue Date: 2023-07-21

Views: 6138

According to insider reports, the new iPhone is set to incorporate stacked battery technology. This advancement will increase battery energy density, extending battery life while mitigating overheating issues.

The following sections will delve into the specifics of stacked batteries, their advantages, and how they differ from traditional winding batteries.

Understanding Stacked Batteries

Stacked batteries, also known as stacking batteries, are lithium-ion batteries produced using lamination processes. These batteries come in both hard shell (square) and soft pack (pouch cell) configurations.

They employ the same fundamental principles as conventional lithium-ion batteries, comprising positive and negative electrodes, separators, and electrolytes. These components work together to generate electricity through the movement of lithium ions.

Stacked batteries are extensively used in numerous electronic devices such as smartphones, laptops, drones, and electric vehicles. They provide higher energy density and enhanced performance within compact spaces. As battery technology progresses, stacked batteries are continuously optimized for improved efficiency and safety.

The Mechanism Behind Winding Batteries

Winding batteries consist of positive and negative electrodes, along with a separator, combined in a rolled format. Known in the industry as "wound cells" or "wound batteries," these energy storage units differ significantly from stacked batteries.

Comparative Analysis: Stacked vs. Winding Batteries

Internal Resistance

Cells created using the lamination method have lower internal resistance compared to wound cells. Lower internal resistance in stacked batteries results in less heat production and slower capacity decay during charge-discharge cycles.

Battery Life

Stacked batteries boast a more uniform internal temperature distribution, reducing the risks associated with high-temperature gradients found in winding batteries. This leads to longer battery life and stable performance.

Stress Distribution

Stacked batteries exhibit even stress distribution across their components. Conversely, the concentrated stress points in winding batteries are prone to micro-short circuits and electrical breakdowns, limiting their cycle life.

Rate Performance

With multiple poles connected in parallel, stacked batteries facilitate high-current discharge efficiently. Wound batteries, limited by single-tab configurations, show inferior rate performance.

Capacity Density

The compact internal configuration of stacked batteries maximizes space utilization, yielding higher capacity density compared to wound batteries, which have less efficient space usage due to their circular cell design.

Safety

Lower internal resistance, balanced temperature distribution, and minimized stress points make stacked batteries safer than their wound counterparts.

Production Complexity

Winding processes are simpler and more conducive to industrial automation. Despite the complexity of lamination, advancements in automation technology have made stacked battery production more feasible.

Manufacturing Ease

Wound batteries are easier to manufacture quickly, whether the process is semi-automatic or fully automated. While stacked batteries require more intricate procedures, automation has streamlined their production as well.

In terms of quality control, wound batteries are easier to manage, yet stacked batteries can achieve consistent results despite their more complex production methods.

iPhone 15's Switch to Stacked Batteries

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Additional resources:
What are the advantages of a lithium battery?

Stacked battery technology will debut in Apple's iPhone 15 series, followed by Samsung's 2024 Galaxy S24+ and S24 Ultra models. This technology involves lamination techniques, resulting in higher capacity and enhanced thermal performance.

Stacked batteries utilize space more efficiently, accommodating more material and increasing overall battery capacity. The layered structure also ensures even heat distribution, preventing localized heating issues typical in wound batteries.

Currently prominent in electric vehicles, stacked battery technology offers high power output, rapid charging, and higher energy density. These benefits are now extending to smartphones, promising improvements in battery life, faster charging, and less heat generation in devices like the iPhone 15.

Reports indicate future iPhone models may support 40W wired and 20W wireless charging via new MagSafe protocols, further illustrating the advantages of stacked battery technology.

Leading Stacked Battery Manufacturers

Companies such as Grepow, a pioneer in soft-packed stacked lithium batteries in China, have been at the forefront of stacked battery innovation. Since 2007, Grepow's lithium battery division has been specializing in sophisticated stacked batteries, gaining recognition globally.

Grepow's batteries offer several advantages, including:

Low Internal Resistance

Lower internal resistance enhances cell rate performance and discharge efficiency. Stacked batteries achieve this by connecting multiple small poles in parallel.

High Rate Discharge

Power applications benefit from the high-current discharge capabilities of stacked batteries, unlike wound batteries, which struggle with single-tab configurations.

Discharge Platform

Stacked batteries exhibit higher and more stable discharge platforms due to reduced internal resistance and polarization effects.

Capacity Density

The stacking process optimizes internal space usage, resulting in higher capacity densities compared to winding processes.

Energy Density

Combining higher discharge platforms with efficient space usage, stacked batteries achieve superior energy densities.

Thickness Control

The consistent internal structure of stacked batteries allows for precise thickness control and prevents deformation, even in thicker batteries.

Customizable Shapes

Stacked batteries can be manufactured in various shapes to fit specific applications, enhancing their versatility.

Application Versatility

Due to their superior rate performance and flexible form factors, stacked batteries are suitable for a broader range of applications, including high-rate and specialized power batteries.

In summary, stacked batteries represent a significant leap in battery technology, providing higher energy densities and more efficient energy solutions. Grepow's products are widely employed in diverse sectors from drones and RC models to medical devices and consumer electronics, showcasing the versatile applications of stacked batteries.

As technological advancements continue, stacked batteries are set to revolutionize energy storage across various industries, paving the way for more innovative, efficient, and sustainable solutions.

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