Three-Electrode Battery Measurement Jig for In-Situ Voltage Accuracy
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Solution Overview
Problem
Conventional methods for measuring electrode potentials in secondary batteries often yield inaccurate results due to differences between experimental conditions and actual battery environments, require disassembly, and are time-consuming, especially when evaluating mass-produced batteries, and fail to account for voltage drops caused by electrode resistance.
Innovation Solution
A jig for measuring three electrode voltages that minimizes air contact and electrolyte use, allowing charge and discharge measurements in conditions similar to actual secondary batteries, with a design that includes a jig body, a reference electrode, and a protective tube to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to measure electrode potentials by placing electrodes in a container with electrolyte, then the measurement setup is simple, but the results do not match the electrode potential in actual batteries due to environmental differences
Solution Approach 1:
The patent introduces a jig as an intermediary device that bridges the gap between simple container-based measurements and actual battery conditions. The jig maintains the sealed battery structure while enabling electrode potential measurements, acting as a mediator that preserves actual battery environmental conditions (sealed case, minimal electrolyte, limited air contact) while allowing measurement access.
2Ease of operation
If a manufactured battery is completely disassembled to measure electrode potential, then direct access to electrodes is achieved, but the process is time-consuming and changes actual battery conditions
Solution Approach 1:
The patent extracts only the necessary measurement functionality from the battery structure by introducing a reference electrode through the sealed case without disassembling the battery. The jig allows the reference electrode to be inserted through the cap assembly, extracting measurement capability while preserving the intact battery structure and minimizing interference with actual operating conditions.
3Productivity
If external voltage is applied between electrodes, then charging and discharging can be measured, but voltage drop due to resistance causes deviation from equilibrium state and measurement errors
Solution Approach 1:
The patent applies local quality by creating a high-impedance measurement path through the reference electrode that is electrically isolated from the main current path. The reference electrode measures potential locally at its insertion point without carrying significant current, thus avoiding voltage drop errors while enabling measurement during charging and discharging operations.
Data Source
AI summary
A jig for measuring three electrode voltages includes: a jig body having a receiving portion for a secondary battery; a jig door for sealing the receiving portion; a positive electrode on the receiving portion, electrically connected to a positive electrode tab, and protruding outwardly; a negative electrode on the receiving portion of the jig body, being in contact with and electrically connected to a conductive member electrically connected to the secondary battery, and protruding outwardly; and a reference electrode inserted into a winding core of an electrode assembly of the secondary battery in the receiving portion while extending through a top plate of the jig body and protruding to an upper portion of the jig body. The reference electrode comprises a metal wire and a metal cap wrapping around the metal wire, and a length of the metal cap is in a range of 15 mm to 20 mm.