Cylindrical Battery Electrode Assembly for Swelling Detection
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Solution Overview
Problem
Cylindrical batteries face swelling issues due to increased form factors, leading to stress concentration, cavity collapse, and potential internal short circuits, which degrade battery performance and pose fire risks.
Innovation Solution
An electrode assembly with a netlike tube-shaped support and integrated wireless sensors to reinforce the core structure, prevent cavity collapse, and detect potential swelling and overheating, comprising a first and second electrode sheet, a separator sheet, and a netlike tube-shaped support that is extendable and shrinkable, with wireless pressure and temperature sensors attached to monitor and transmit data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the form factor of cylindrical batteries is increased to increase output and capacity, then the battery performance is improved, but the heat generation and swelling occur more easily
Solution Approach 1:
The core structure is divided into multiple wound packs arranged in parallel, with each pack having its own cavity. This segmentation distributes the stress that would otherwise concentrate in a single large core, reducing the likelihood of cavity collapse while maintaining the high power output capability of the larger form factor battery.
2Power
If the form factor of cylindrical batteries is increased to increase output and capacity, then the battery performance is improved, but the swelling occurs more easily leading to cavity collapse
Solution Approach 1:
The core is segmented into multiple wound packs, each maintaining its own cavity structure. This segmentation allows each individual cavity to better withstand swelling stresses without the collapse that would occur in a single large cavity, thereby maintaining reliability while enabling higher power output through increased battery capacity.
Solution Approach 2:
The netlike tube-shaped support structure is nested within the cavity of each wound pack, providing internal reinforcement. This nested support prevents the cavity from collapsing during swelling while maintaining the electrochemical performance benefits of the wound structure.
3Volume of stationary object
If the cavity diameter increases with larger winding means, then the battery capacity increases, but the area near the cavity becomes more prone to stress and collapse
Solution Approach 1:
A netlike tube-shaped support is nested inside the cavity, providing internal reinforcement that prevents collapse. This allows the cavity to maintain a larger volume for improved capacity while the nested support structure compensates for the reduced stress resistance that would otherwise result from the larger cavity diameter.
Solution Approach 2:
The core structure combines the wound electrode packs with a netlike tube-shaped support material. This composite structure provides both the electrochemical functionality of the wound packs and the mechanical strength of the netlike support, enabling large cavity volumes without sacrificing stress resistance.
4Quantity of substance
If the winding means diameter increases to accommodate larger form factors, then the battery capacity increases, but the cavity diameter increases making it more prone to collapse
Solution Approach 1:
The battery is divided into multiple wound packs, each with its own cavity and netlike support. This segmentation allows the total battery capacity to be increased by adding more packs rather than enlarging a single cavity, thereby maintaining cavity stability while achieving higher overall capacity.
Solution Approach 2:
The netlike tube-shaped support is nested within each cavity to provide reinforcement. This allows each cavity to maintain stability even as the overall battery capacity increases through the addition of more wound packs, preventing the reliability issues that would arise from larger individual cavities.
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
The solution enhances the core's strength, prevents internal short circuits, and allows for early detection of swelling and overheating, thereby maintaining battery performance and safety by reinforcing the core and enabling remote monitoring.
Implementation Method 1
the netlike tube-shaped support (150) may be extendable and shrinkable in a radial direction and/or the lengthwise direction
Implementation Method 2
a wireless pressure sensor, and the wireless pressure sensor may be installed in at least one location of an outer or inner surface of the netlike tube-shaped support (150)
Implementation Method 3
a wireless temperature sensor, and the wireless temperature sensor may be installed in at least one location of an outer or inner surface of the netlike tube-shaped support (150)
Implementation Method 4
Joule heating originated from the internal resistance of the electrode assembly also increases
Data Source
AI summary
An electrode assembly includes a first electrode sheet, a second electrode sheet, a separator sheet located between the first electrode and the second electrode, the first electrode sheet, the second electrode sheet and the separator being wound about a winding central axis to define a cavity, and a netlike tube-shaped support is installed along a lengthwise direction of the cavity. A wireless pressure sensor or a wireless temperature sensor may be installed in at least one location of an outer or inner surface of the netlike tube-shaped support. A cylindrical battery including the electrode assembly is also provided.