Battery Cell Insulator Indented Shape for Electrode Stability
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Solution Overview
Problem
Existing battery cells with thick housing units face challenges in maintaining electrode stability due to loose connections, leading to reduced durability.
Innovation Solution
Incorporating a first insulator with an indented contact surface within the housing unit to securely fix the electrode unit, along with internal and external terminals, and using conductive fixing members to prevent electrode movement and enhance assembly, thereby improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick housing unit (metal plate) is used, then structural strength is improved, but heat-sealing of the contact layer becomes difficult and components become loose
Solution Approach 1:
The patent divides the housing unit into multiple sections: a thick main body for structural strength and a thinner sealing portion for reliable heat-sealing. This segmentation allows each part to optimize its thickness for its specific function, resolving the contradiction between structural strength and sealing reliability.
Solution Approach 2:
The housing unit employs different thicknesses in different locations - thicker in the main body for strength and thinner at the sealing portion for ease of heat-sealing. This local quality variation enables both structural integrity and reliable component fixation without compromise.
2Reliability
If the contact layer is heat-sealed to fix the external terminal, then electrical connection is improved, but the housing unit and components may become loose over time
Solution Approach 1:
The patent merges multiple functions into the single contact layer: electrical conduction, mechanical fixation, and sealing. By integrating these functions, the contact layer simultaneously ensures electrical connection reliability and assembly stability, preventing both electrical and mechanical loosening.
Solution Approach 2:
The contact layer serves multiple purposes: it conducts electricity, seals the housing, and mechanically secures the external terminal. This multi-functionality ensures that a single component addresses both electrical connection and assembly stability requirements.
3Object-affected harmful factors
If the electrode unit is accommodated in the housing unit, then protection is improved, but jolt of the housing unit causes jolt of the electrode unit leading to deterioration
Solution Approach 1:
The patent introduces cushioning elements and shock-absorbing structures within the housing unit that are positioned beforehand to protect the electrode unit. These elements absorb external shocks before they reach the electrode, preventing deterioration while maintaining protection.
Solution Approach 2:
The patent employs intermediary components such as insulating layers and cushioning materials between the housing unit and the electrode unit. These intermediaries act as mediators that decouple the shock transmission, allowing the housing to provide protection while preventing direct shock transfer to the electrode unit.
Data Source
AI summary
A battery cell includes: an electrode unit including a positive electrode, a negative electrode, a current collector, and a separator; a housing unit accommodating the electrode unit; a first insulator disposed inside the housing unit and between the electrode unit and the housing unit, an internal terminal disposed inside the housing unit and electrically connected to the current collector; a second insulator disposed inside the housing unit and between the internal terminal and the housing unit; and an external terminal disposed outside the housing unit. A contact surface of the first insulator with the electrode unit has indented shape. The first insulator is fixed to the housing unit.