Battery Sensing Sheet for Early Internal Short Detection
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Solution Overview
Problem
Lithium dendrite formation during charge/discharge cycles in rechargeable lithium batteries leads to internal shorts, causing damage and heat release, which existing modifications to electrolytes and electrode surfaces have not adequately addressed.
Innovation Solution
Incorporating a sensing sheet with multiple sensing tabs between the anode and cathode, connected to sensing circuitry that measures resistance, current, or voltage, allowing for early detection and mitigation of dendrite formation by determining the two-dimensional position and resistance of internal shorts, and potentially treating the dendrites to prevent shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator is used to physically separate electrodes, then electrical insulation between electrodes is improved, but internal shorts can still occur through dendrite penetration
Solution Approach 1:
A sensing sheet is introduced as an intermediary component between the electrodes and separator. This sensing sheet contains sensing circuitry that detects dendrite formation early and provides feedback to the battery management system, enabling preventive action before dendrites can penetrate through the separator and cause internal shorts.
Solution Approach 2:
The sensing sheet incorporates sensing circuitry that continuously monitors the battery cell for dendrite formation and provides real-time feedback to the battery management system. This feedback mechanism enables the system to detect dendrite growth at early stages and take corrective actions before internal shorts occur.
2Difficulty of detecting and measuring
If sensing circuitry is added to detect dendrites early, then detection capability is improved, but device complexity increases
Solution Approach 1:
The sensing sheet serves multiple functions: it acts as a physical separator component, contains sensing circuitry for dendrite detection, and provides structural support within the battery cell. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while improving detection capability.
Solution Approach 2:
The sensing circuitry is merged directly into the sensing sheet structure, combining the separator function with the detection function in a single integrated component. This integration approach minimizes the number of separate parts and reduces overall device complexity while maintaining effective dendrite detection.
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
Enables the detection and prevention of internal shorts before they cause damage, extending battery life and safety by identifying and addressing dendrite formation early, thereby minimizing heat release and structural damage.
Implementation Method 1
determining a resistance and a two-dimensional position of the internal short on the sensing sheet
Data Source
AI summary
Devices, systems, and techniques for identifying a dendrite material within a battery. The method comprising receiving, by a battery management system, an output from sensing circuitry within the battery indicative of a first voltage level, detecting, by the battery management system, a change from the first voltage level to a second voltage level that is indicative of an internal short within a sensing sheet, determining by the battery management system, a resistance and a two-dimensional position of the internal short within the sensing sheet, and identifying, by the battery management system, a dendrite material based on the resistance of the internal short.