Wound Battery Cell Conductive Core for Higher Energy Density
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Solution Overview
Problem
Existing batteries suffer from low internal space utilization and energy density due to the removal of the winding shaft, which leaves a hollow space and requires additional tab welding, increasing the risk of lithium precipitation and safety hazards.
Innovation Solution
A battery design that uses a conductive structure to replace the winding shaft, allowing the electrode plates to be wound around it, with the starting ends of the plates located between conductive members, eliminating the need for tab welding and optimizing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a winding shaft is used to wind electrode plates, then the electrode plates can be assembled, but a hollow space is left after shaft removal causing low internal space utilization
Solution Approach 1:
The patent merges the winding shaft with the battery cell structure by making the conductive members (tabs) themselves serve as the winding core. The electrode plates are wound around these conductive members which remain permanently integrated into the battery structure, eliminating the need for separate shaft removal and avoiding hollow spaces.
Solution Approach 2:
The conductive members (tabs) perform dual functions: they serve as both the winding core during assembly and as the electrical conductors in the finished battery. This self-service approach eliminates the need for separate winding shafts that would need to be removed, maximizing internal space utilization.
2Reliability
If tabs are welded to metal sheets to conduct electrons, then electrical connection is achieved, but the process complexity and safety risks increase
Solution Approach 1:
The patent extracts the welding process from the battery assembly by using conductive adhesive instead of thermal welding. This eliminates the complex welding equipment and processes while maintaining reliable electrical connections between the conductive members and current collectors.
Solution Approach 2:
The patent replaces the mechanical/thermal welding system with a chemical bonding system using conductive adhesive. This substitution eliminates the need for welding equipment, reduces process complexity, and improves safety by eliminating welding-related hazards while maintaining electrical conductivity.
3Ease of manufacture
If electrode plates are wound around a removable shaft, then assembly is possible, but energy density is reduced due to hollow space
Solution Approach 1:
The patent combines the winding core function with the electrical conductor function by using the conductive members as both the winding shaft and the tabs. This integration eliminates hollow spaces and maximizes the active material volume, thereby improving energy density while maintaining ease of manufacture.
4Productivity
If traditional winding and tab welding is used, then battery assembly is achieved, but lithium precipitation risk increases
Solution Approach 1:
The patent replaces the tab welding process with conductive adhesive bonding, which eliminates thermal stress and potential damage to the electrode plates during assembly. This reduces the risk of lithium precipitation while maintaining assembly productivity.
Data Source
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Figure 3A~3B
AI summary
A battery (100) includs a housing (10) and a battery cell (20) accommodated in the housing (10). The housing (10) includes a first housing body (11) and a second housing body (12) electrically isolated from each other. The second housing body (12) is mounted on the first housing body (11). The battery cell (20) includes a first electrode plate (21), a second electrode plate (22), and a separator (23) located between the first electrode plate (21) and the second electrode plate (22). The battery (100) further includes a first conductive member (31) and a second conductive member (32) accommodated in the housing (10) and electrically isolated from each other, wherein the first conductive member (31) electrically connects the first electrode plate (21) and the first housing body (11), and the second conductive member (32) electrically connects the second electrode plate (22) and the second housing body (12). The first conductive member (31) and the second conductive member (32) form a conductive structure (30), and the first electrode plate (21), the separator (23), and the second electrode plate (22) are wound around the conductive structure (30) to form the battery cell (20). A starting end of the first electrode plate (21) and a starting end of the second electrode plate (22) are located between the first conductive member (31) and the second conductive member (32). An electronic apparatus (200) containing the battery (100) is disclosed. The battery (100) can improve internal space utilization and energy density of the battery (100).