Battery Current Collector Blocking Structure for Particle Filtration
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Solution Overview
Problem
The current collector welding process in battery cell production affects the reliability of the battery cells due to metal particles entering the electrode assembly, leading to potential short circuits and safety hazards.
Innovation Solution
A current collector with a blocking structure that prevents solid particles from passing through openings, allowing electrolyte flow while blocking metal particles, ensuring smooth electrolyte wetting and preventing particle entry into the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector opening is used for electrolyte flow, then the electrolyte wetting is improved, but metal particles can enter the electrode assembly causing short circuits
Solution Approach 1:
A blocking structure is introduced as an intermediary component at the opening of the current collector. This structure selectively allows electrolyte to pass through while blocking metal particles, thus mediating between the need for electrolyte flow and the need to prevent particle contamination.
Solution Approach 2:
The blocking structure is designed with a porous or mesh configuration that has pore sizes permitting electrolyte molecules to pass through while being too small to allow metal particles to penetrate. This enables selective permeability based on particle size differences.
2Object-affected harmful factors
If the opening is blocked to prevent metal particles, then particle entry is prevented, but electrolyte flow is restricted
Solution Approach 1:
The blocking structure utilizes porous material with carefully controlled pore dimensions that are large enough to permit electrolyte flow but small enough to block metal particles, thus resolving the contradiction between filtration and fluid transport.
Solution Approach 2:
The pore size parameter of the blocking structure is optimized to a specific range that simultaneously satisfies the requirements for electrolyte permeability and particle blocking, transforming the single parameter to achieve dual functionality.
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
Improves the reliability of battery cells by preventing metal particles from entering the electrode assembly, ensuring smooth electrolyte flow, and enhancing the utilization of internal space, thus reducing safety risks and improving assembly reliability.
Implementation Method 1
a blocking structure disposed at the opening and configured to prevent solid particles from passing through the opening from the first side to move to the second side
Data Source
AI summary
A current collector comprises a current collector body, provided with a first side and a second side which are oppositely arranged, an opening passing through the first side and the second side being formed in the current collector body; and a blocking structure, which is arranged at the opening and is used for preventing solid particles from passing through the opening from the first side to move to the second side. The blocking structure facilitates an electrolyte to enter, via the current collector, a space above or below the current collector inside a casing, thus ensuring that the electrolyte wets an end of an electrode assembly and increasing the internal space utilization of the casing, and additionally, the blocking structure can prevent metal particles generated during a welding process of the current collector from entering the electrode assembly.