Cylindrical Lithium Battery Metal Screw Connection
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Solution Overview
Problem
Rechargeable lithium batteries, particularly the 18650 model, face safety concerns due to potential short circuits between the positive and negative electrodes and require improved assembly stability to prevent damage from drops, which current technologies fail to adequately address.
Innovation Solution
A rechargeable lithium battery apparatus with a cylindrical shape featuring a metal screw connection structure between the positive electrode and the protection circuit board, along with insulating sheets and glue, and a steel cylinder for enhanced safety and stability, ensuring secure connections and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal screw connection structure is used to connect the protection circuit board to the battery cell, then assembly stability and connection strength are improved, but device complexity increases
Solution Approach 1:
The patent combines the connection function and fixation function into a single metal screw connection structure. The screw simultaneously provides electrical connection between the protection circuit board and battery cell while providing mechanical fixation, eliminating the need for separate connection and fixation components.
Solution Approach 2:
The metal screw connection structure serves multiple functions: it provides electrical conduction between the positive electrode of the protection circuit board and the battery cell, provides mechanical fixation to prevent detachment, and maintains structural stability during drops or deformation. One component performs multiple critical functions.
2Reliability
If insulating sheets and glue are added between positive and negative electrodes, then safety against short circuits is improved, but device complexity increases
Solution Approach 1:
The patent introduces insulating sheets as an intermediary component between the positive and negative electrodes. These sheets act as a physical barrier preventing direct contact and potential short circuits, while the adhesive glue serves as a mediator to secure the insulating sheets in place. The intermediary components isolate harmful electrical contact while maintaining structural integrity.
3Strength
If a steel cylinder is added for sheathing and accommodating the battery cell, then protection against deformation and damage is improved, but weight and device complexity increase
Solution Approach 1:
The steel cylinder serves as a pre-established protective structure that cushions and protects the battery cell against external impacts, drops, and deformation before damage can occur. The cylindrical shell provides structural reinforcement and impact absorption, protecting the internal battery components from mechanical damage during normal use or accidental drops.
Data Source
AI summary
The present application discloses a rechargeable lithium battery apparatus, comprising a battery cell in a cylindrical shape, a positive electrode of the battery cell has a protection circuit board arranged, wherein, between the positive electrode of the battery cell in the cylindrical shape and a positive electrode of the protection circuit board, there is a metal screw connection structure arranged, acting as the positive electrode of the protection circuit board, connecting electrically to the positive electrode of the battery cell. The rechargeable lithium battery apparatus of the present application, due to adopting a metal screw connection structure arranged on a circuit board at the positive electrode of the battery, corresponding to the positive electrode of the battery cell, achieves a positive electrode cap and a solid connection between the protection circuit board and the battery cell, forming a brand new lithium battery apparatus.