Battery
A bipolar electrode battery design with varying FEC ratios in cells based on activity levels addresses gas generation and cycle performance issues by optimizing FEC distribution, ensuring stable battery operation.
JP2026091136APending Publication Date: 2026-06-03TOYOTA JIDOSHA KK
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2024-11-22
- Publication Date
- 2026-06-03
AI Technical Summary
Technical Problem
The use of fluoroethylene carbonate (FEC) in batteries can improve cycle performance but risks gas generation when used in large amounts, while using small amounts fails to achieve good cycle performance.
Method used
A battery design with a bipolar electrode structure, where the proportion of FEC in internal cells is higher than in end cells, and the central cell has a higher FEC proportion than outer cells, optimizing FEC distribution based on cell activity.
Benefits of technology
Suppresses gas generation and maintains good cycle characteristics by adjusting FEC ratios in different cells to match their activity levels, preventing battery deterioration and uneven reactions.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026091136000001_ABST
Abstract
The primary objective of this disclosure is to provide a battery that suppresses the generation of gases derived from FEC and has good cycle characteristics. [Solution] The present disclosure provides a battery comprising a bipolar electrode having an intermediate current collector, a positive electrode composite layer disposed on one side of the intermediate current collector, and a negative electrode composite layer disposed on the other side of the intermediate current collector, wherein the battery comprises a plurality of cells in the thickness direction, each of which contains an electrode body having the positive electrode composite layer, a separator layer, and the negative electrode composite layer, and each of the plurality of cells independently contains an electrolyte containing fluoroethylene carbonate (FEC) as a solvent component, and when the cells located at the ends in the thickness direction are designated as end cells and the cells located inside the end cells are designated as internal cells, the proportion of FEC in the solvent component of the internal cells is greater than the proportion of FEC in the solvent component of the end cells, thereby solving the above problem.
Need to check novelty before this filing date? Find Prior Art