Flexible Battery Core Blocks for Foldable Device Stress Management
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Solution Overview
Problem
The existing battery solutions for foldable mobile terminals, composed of lithium ion battery blocks, fail to meet the curling requirements of folding products due to stress accumulation and deformation differences during the curling process, leading to potential battery failure.
Innovation Solution
A flexible battery design featuring a plurality of flexible electric core blocks arranged at intervals along a curling direction with gradually increasing spacing, connected by flexible bridges that are electrically linked and arranged in a staggered manner to manage stress and enhance curling performance, along with a structure that includes a flexible packaging layer and an electric core layer with specific laminated components for improved stress distribution and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium ion battery blocks are used for foldable mobile terminals, then power supply capacity is provided, but stress accumulation and deformation differences occur during curling, leading to battery failure
Solution Approach 1:
The battery is divided into multiple flexible electric core blocks arranged in series, where each block can independently deform during curling. This segmentation reduces stress accumulation by distributing mechanical stress across multiple independent units rather than a single rigid block, thereby improving battery reliability during curling operations.
Solution Approach 2:
The battery adopts a flexible structure with thin film characteristics, using flexible packaging layers and thin electric core blocks that can bend and deform without breaking. This flexible design allows the battery to adapt to curling movements of foldable devices, preventing deformation-induced failure and enhancing reliability.
2Quantity of substance
If multiple battery blocks are arranged to increase capacity, then power supply capacity improves, but thickness and structural complexity increase
Solution Approach 1:
Multiple electric core blocks are arranged in a nested or compact configuration where blocks are positioned closely together with minimized spacing. The flexible connecting bridges enable compact arrangement while maintaining electrical connectivity, allowing increased capacity without proportionally increasing overall battery thickness.
Solution Approach 2:
The battery blocks are arranged in a three-dimensional configuration rather than simple linear stacking, utilizing spatial optimization to pack more capacity into a smaller thickness envelope. The flexible connecting bridges enable complex spatial arrangements that maximize capacity density while minimizing overall dimensions.
3Ease of manufacture
If battery blocks are arranged with uniform spacing, then manufacturing simplicity is maintained, but curling performance deteriorates due to stress accumulation
Solution Approach 1:
The spacing between electric core blocks is optimized locally based on their position within the battery structure. Blocks experiencing higher stress during curling are positioned with greater spacing to accommodate deformation, while blocks in lower-stress regions maintain closer spacing. This localized optimization balances manufacturing feasibility with curling performance requirements.
Data Source
AI summary
A flexible battery and a display device are provided. The flexible battery includes: a plurality of flexible electric core blocks; wherein the plurality of flexible electric core blocks are arranged at intervals along a curling traveling direction, a spacing between adjacent flexible electric core blocks is gradually increased along the curling traveling direction; at least one flexible connecting bridge is arranged between the adjacent flexible electric core blocks, and two ends of the flexible connecting bridge are electrically connected with the adjacent flexible electric core blocks respectively.