Battery Cell End Cap Reinforcement for Internal Pressure Stability
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Solution Overview
Problem
Battery safety and lifespan are compromised due to increased internal pressure during charge-and-discharge cycles, leading to deformation of the end cap and potential failure of electrical connections.
Innovation Solution
A battery cell design featuring a reinforcing portion on the end cap to enhance structural strength, reduce deformation, and prevent interference with the electrode terminal, combined with a sealing element for airtightness and efficient manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end cap structure is simplified for ease of manufacture, then manufacturing efficiency is improved, but the structural strength is reduced leading to deformation under internal pressure
Solution Approach 1:
The end cap is designed with a reinforcing portion that has different structural properties than the rest of the end cap body. This reinforcing portion is locally positioned to provide enhanced strength where needed (resisting internal pressure) while the rest of the end cap maintains simplicity for ease of manufacture. The reinforcing portion may include features such as ribs, protrusions, or thicker material concentration at specific locations.
2Duration of action of stationary object
If the internal pressure resistance is improved by strengthening the end cap, then the lifespan is extended, but the manufacturing complexity increases
Solution Approach 1:
The end cap is divided into functionally distinct regions: a main end cap body for basic sealing and mounting functions, and a separate reinforcing portion for pressure resistance. This segmentation allows each part to be optimized independently - the body for manufacturability and the reinforcing portion for strength - while being manufactured as an integrated component.
3Reliability
If the electrode terminal position is optimized for electrical connection, then connection reliability is improved, but the space for reinforcing structure is reduced
Solution Approach 1:
The end cap design employs asymmetric positioning where the electrode terminal mounting area is kept clear and accessible, while the reinforcing portion is positioned in regions that do not interfere with electrical connections. This asymmetric layout allows both the electrode terminal to be properly mounted for reliable electrical connection and the reinforcing portion to provide structural support without conflict.
Data Source
AI summary
This application discloses a battery cell, a battery, an electrical device, and a method and equipment for manufacturing a battery cell. The battery cell includes a housing, an end cap, and an electrode terminal. An opening is made on the housing. The end cap covers the opening and is seamed to the housing. The electrode terminal is disposed on the end cap. A reinforcing portion is disposed on the end cap. A projection of the electrode terminal on the end cap does not overlap the reinforcing portion. The technical solution provided herein can solve a battery safety problem caused by an increased internal pressure during the use of the battery, and improve the lifespan of the battery.