Flexible Battery Cell Tensioning for Volume Change Stability
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Solution Overview
Problem
Solid-state batteries experience significant volume changes during charging and discharging, leading to shifts in voltage taps relative to the battery housing, which can compromise their operation and require complex pressure management systems.
Innovation Solution
A flexible tensioning device supported by a motor vehicle component applies a constant force to battery cells, accommodating volume changes and enabling modular expansion or replacement, with optional electronic control for adjusting force based on state of charge and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid-state batteries are used to achieve high energy density, then energy storage capacity is improved, but volume change during charging/discharging causes voltage tap shifts and operational reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by using a flexible tensioning device that dynamically adjusts the pressing force parameter on battery cells. This compensates for volume changes during charging/discharging cycles, maintaining optimal contact pressure between cells and voltage taps, thereby preventing voltage tap shifts and ensuring operational reliability while preserving high energy density benefits
2Stability of the object's composition
If rigid housing structures are used to maintain battery shape, then structural stability is improved, but inability to accommodate volume change causes manufacturing precision to deteriorate
Solution Approach 1:
The patent applies dynamics by replacing rigid housing structures with a flexible tensioning device that can dynamically adapt to battery cell volume changes. The flexible device maintains structural stability through controlled pressing force while allowing the battery assembly to accommodate expansion and contraction during charging/discharging, thereby preventing voltage tap positioning errors and maintaining manufacturing precision
3Measurement precision
If complex pressure management systems are used to maintain constant pressure on battery cells, then pressure control precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a flexible tensioning device that automatically adjusts and maintains optimal pressing force on battery cells without requiring complex external control systems. The flexible material inherently provides the necessary pressure management through its elastic properties, eliminating the need for sophisticated sensors, actuators, and control algorithms while maintaining precise pressure control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution maintains consistent pressure on battery cells, supports modular capacity adjustment, reduces weight and cost, and enhances battery operation efficiency and durability.
Implementation Method 1
at least one first flexible tensioning device (20) for exerting a predetermined force (K) on the plurality of battery cells (14)
Data Source
AI summary
A battery includes a plurality of battery cells, where each of the battery cells has a first volume in a discharged state of the battery cell and a second volume which is different from the first volume in a charged state of the battery cell. A predetermined force is exertable on the plurality of battery cells by a flexible tensioning device in the discharged state and in the charged state. The flexible tensioning device is configured such that, in order to exert the predetermined force on the plurality of battery cells, the flexible tensioning device is supportable on a motor vehicle component of a motor vehicle.