18582255. SECONDARY BATTERY simplified abstract (Murata Manufacturing Co., Ltd.)

SECONDARY BATTERY

Organization Name

Murata Manufacturing Co., Ltd.

Inventor(s)

Toshihiro Hiratsuka of Kyoto (JP)

SECONDARY BATTERY - A simplified explanation of the abstract

This abstract first appeared for US patent application 18582255 titled 'SECONDARY BATTERY

The abstract describes a secondary battery with a unique structure where positive and negative electrodes are stacked with a separator in between, wound around a winding axis.

• Positive electrode includes a current collector and active material layer, while the negative electrode includes a similar structure.
• The innermost wind of the positive electrode has two parts with different area densities of active material.
• The battery device has a section with a flat region and a curved region, intersecting the winding axis.

• • Potential Applications:**

- Energy storage for electric vehicles - Portable electronic devices - Renewable energy storage systems

• • Problems Solved:**

- Enhanced battery performance and efficiency - Improved energy density - Longer battery lifespan

• • Benefits:**

- Increased energy storage capacity - Better overall battery performance - Extended battery cycle life

• • Commercial Applications:**

Title: Advanced Secondary Battery Technology for Energy Storage Solutions This technology can be utilized in electric vehicles, consumer electronics, and renewable energy systems, offering improved energy storage capabilities and efficiency.

• • Questions about Secondary Battery Technology:**

1. How does the unique structure of this secondary battery improve its performance compared to traditional designs? 2. What are the specific advantages of having different area densities of active material in the innermost wind of the positive electrode?

Original Abstract Submitted

A secondary battery includes a battery device in which a positive electrode and a negative electrode are stacked on each other with a separator interposed between the positive electrode and the negative electrode and a stack of the positive electrode, the negative electrode, and the separator is wound about a winding axis. A section of the battery device has an elongated shape defined by a major axis and a minor axis. The section intersects the winding axis. The battery device includes a flat region and a curved region. The flat region extends in a direction of the major axis. The curved region is coupled to the flat region and is curved. The positive electrode includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is provided on the positive electrode current collector. The negative electrode includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is provided on the negative electrode current collector and opposed to the positive electrode active material layer. At least the positive electrode active material layer in an innermost wind of the positive electrode of the battery device includes a first part and a second part. The first part includes a positive electrode active material having a first area density. The second part includes a positive electrode active material having a second area density that is lower than the first area density. The second part is provided at least on both a whole of the positive electrode active material layer in the innermost wind in the curved region and the positive electrode active material layer in the innermost wind in a portion, of the flat region, that is in a vicinity of a border between the flat region and the curved region.