Battery Electrode Tab Groove and Isolation Film Design
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Solution Overview
Problem
Lithium batteries face safety issues due to potential short circuits caused by bent electrode tabs contacting the electrode plates, which can lead to decreased safety and performance.
Innovation Solution
The battery design incorporates receiving grooves on the electrode plates to prevent contact between the bending portions of the electrode tabs and the plates, using a second electrode tab to clad the first electrode tabs and forming a bending portion that does not contact the plates, even when moving, and an isolation film with a blocking area to further prevent shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode tabs are bent to improve energy density and reduce space, then energy density is improved, but short circuit risk increases due to contact between bent tabs and electrode plates
Solution Approach 1:
The battery structure is segmented into distinct functional zones: electrode plates are provided with receiving grooves that create separate spaces for bent electrode tabs, isolating them from potential contact points. This spatial segmentation prevents short circuits while maintaining the bent tab configuration for improved energy density.
Solution Approach 2:
An isolation film is introduced as an intermediary component between the electrode plates and bent electrode tabs. The isolation film includes blocking areas that physically prevent contact between conductive elements, serving as a safety mediator that allows the bent tab design to proceed without short circuit risks.
2Volume of moving object
If electrode tabs are bent to reduce space occupied, then space utilization is improved, but contact with electrode plates occurs leading to short circuits
Solution Approach 1:
The receiving grooves on electrode plates create segmented safe zones that accommodate bent electrode tabs without allowing contact with other conductive elements. This segmentation enables compact tab arrangement while preventing short circuits through spatial isolation.
Solution Approach 2:
The isolation film acts as a mediator between the bent electrode tabs and electrode plates, providing physical separation that prevents harmful contact while allowing the tabs to maintain their space-efficient bent configuration.
3Reliability
If receiving grooves are added to electrode plates to prevent short circuits, then safety is improved, but device complexity increases
Solution Approach 1:
Instead of redesigning the entire battery structure, receiving grooves are added only at specific local positions on the electrode plates where bent electrode tabs will be positioned. This localized modification provides safety without requiring complex global structural changes.
Solution Approach 2:
An isolation film, a thin flexible component, is used to provide additional safety protection. This thin film approach prevents short circuits without adding significant structural complexity or rigidity to the battery design.
4Reliability
If isolation film with blocking area is added to prevent short circuits, then safety is improved, but manufacturing complexity increases
Solution Approach 1:
The isolation film with blocking areas is combined with the electrode plate assembly in a single manufacturing step. The blocking areas on the isolation film are positioned to align with receiving grooves, creating an integrated safety system that can be manufactured together rather than assembled separately.
Solution Approach 2:
The isolation film is implemented as a thin, flexible component that can be easily handled and positioned during manufacturing. Its flexibility allows it to conform to the battery structure while providing necessary blocking functionality, simplifying the manufacturing process.
Data Source
AI summary
A battery proofed against short circuiting, for better safety, includes a battery cell and a first set of electrode tabs. The battery cell includes a first electrode plate and a second electrode plate. The first set of electrode tabs is electrically connected to the first electrode plate. The first set of electrode tabs includes a first bending portion, an edge of the second electrode plate defines a first receiving groove, and the first receiving groove corresponds to the first bending portion.