Battery Cell Tab Blocking Structure for Vibration Short Prevention
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Solution Overview
Problem
Lithium secondary batteries are prone to internal short circuits due to vibrations or shocks, which can lead to explosions or fires.
Innovation Solution
The battery cell incorporates short-circuit blocking portions made of thermoplastic polymer, disposed on the separators to form blocking blocks that interconnect electrodes and separators, preventing movement and contact during vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode assemblies with multiple electrodes are disposed in a case, then battery energy density is improved, but internal short circuits may occur due to vibrations
Solution Approach 1:
A blocking block made of thermoplastic material is introduced as an intermediary component between the electrode tabs and the separator. This blocking block prevents direct contact between positive and negative electrode tabs during vibrations, thereby eliminating the short circuit risk while maintaining the high energy density configuration of stacked electrode assemblies.
Solution Approach 2:
The separator is divided into multiple segments by forming recesses that create separated regions. These recesses allow the blocking blocks to be positioned at specific locations between electrode tabs, providing targeted short circuit prevention at critical points while maintaining the overall integrity and energy density of the electrode assembly.
2Reliability
If separators are disposed between electrode plates, then electrode separation is achieved, but movement of electrode tabs during vibrations can cause short circuits
Solution Approach 1:
The blocking blocks are nested within the recesses formed in the separator structure. This nesting arrangement allows the blocking blocks to be securely positioned between the electrode tabs and the separator, providing stable mechanical support that prevents tab movement during vibrations while maintaining proper electrode separation.
Solution Approach 2:
The blocking blocks are bonded to both the separator and the electrode tabs, merging these components into a unified structure. This bonding creates a stable assembly where the electrode tabs are firmly positioned relative to the separator, preventing vibration-induced movement and short circuits.
3Reliability
If short-circuit blocking portions are added to prevent vibrations, then safety is improved, but device complexity increases
Solution Approach 1:
Rather than modifying the entire separator or electrode assembly structure, the blocking blocks are applied locally at specific recesses in the separator where short circuit risks are highest. This localized approach provides effective vibration resistance while minimizing the increase in overall device complexity.
Solution Approach 2:
The blocking blocks are made from thermoplastic material that can be bonded to the separator and electrode tabs through thermal processes. By utilizing the thermoplastic property of the material, the blocking blocks can be integrated into the existing manufacturing process without requiring complex assembly steps, thereby reducing the impact on device complexity.
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 effectively prevents internal short circuits by integrating electrodes and separators, enhancing stability and safety against external shocks and vibrations.
Implementation Method 1
the short-circuit blocking portion may be formed of a material in which at least a portion thereof is melted at 100° C. to 150° C.
Implementation Method 2
mutually bonding the short-circuit blocking portions disposed in a row in a stacking direction of the electrode plate and the separator by thermally compressing the short-circuit blocking portions
Implementation Method 3
mutually bonding the short-circuit blocking portions disposed in a row in a stacking direction of the electrode plate and the separator by thermally compressing the short-circuit blocking portions
Data Source
AI summary
A battery cell according to an embodiment of the present disclosure may include an electrode assembly in which a plurality of separators are disposed between a plurality of electrode plates; a plurality of electrode tabs extending from the plurality of electrode plates and bonded to an electrode lead; and a plurality of short-circuit blocking portions in which one surface thereof is bonded to the separator, and the other surface thereof is bonded to the electrode tabs to suppress movement of the electrode tab.