Three-Electrode Battery Jig for In-Cell Voltage Measurement
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Solution Overview
Problem
Conventional methods for measuring electrode potentials in secondary batteries face issues such as mismatched results with actual cell conditions, inability to simultaneously measure anode and cathode potential changes during charging and discharging, time-consuming disassembly for testing, and errors due to voltage drops from electrode resistance, making it difficult to accurately evaluate battery performance and safety.
Innovation Solution
A jig for measuring 3-electrode voltage that minimizes air contact and electrolyte use, featuring a receiving part for mounting a secondary battery, a top plate with a reference groove, a cathode electrode, an anode electrode, and a reference electrode that penetrates the top plate, allowing for accurate measurement of charging and discharging voltages in conditions similar to actual battery environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to measure electrode potentials by placing electrolyte in a container and installing electrodes, then the measurement setup is simple, but the results do not match the electrode potential in actual cells due to different internal environments
Solution Approach 1:
The patent introduces a reference electrode as an intermediary element that penetrates the top plate to access the electrolyte inside the sealed battery cell. This mediator enables potential measurement without disrupting the sealed environment, bridging the gap between external measurement equipment and internal battery conditions.
Solution Approach 2:
The jig is designed with multi-functionality to accommodate various measurement requirements. The top plate can be configured with different electrode arrangements and sealing mechanisms, allowing the same device to measure both sealed and open battery configurations, as well as handle different cell types and sizes.
2Measurement precision
If the battery is completely disassembled to measure electrode potential, then measurement access is improved, but the process becomes time-consuming and changes the actual conditions of the battery
Solution Approach 1:
The patent extracts only the necessary measurement function by introducing a reference electrode that penetrates the top plate, rather than disassembling the entire battery. This selective extraction allows potential measurement while maintaining the sealed structure and actual operating conditions of the battery.
Solution Approach 2:
The top plate is pre-configured with electrode connections and sealing structures before the battery is placed in the jig. This preliminary preparation eliminates the need for time-consuming disassembly during measurement, as all measurement interfaces are already in place.
3Power
If external voltage is applied between electrodes to measure potential, then the measurement can be performed, but voltage drop due to resistance causes the reference electrode potential to deviate from equilibrium state
Solution Approach 1:
The patent positions the reference electrode to penetrate the top plate and extend into the electrolyte, creating an equipotential reference point that minimizes voltage drop effects. The electrode arrangement and positioning are designed to reduce resistance-induced potential deviations, maintaining the reference electrode close to equilibrium state during measurement.
4Measurement precision
If jelly-roll is immersed in solution in beaker or disassembled into bi-cell type for measurement, then electrode potential can be measured, but manufacture is not easy and time consuming
Solution Approach 1:
The jig is designed with universal applicability to handle various battery formats and measurement configurations. The top plate can be configured for different electrode arrangements, and the jig accommodates both sealed and open battery types, eliminating the need for specialized setups for different measurement scenarios.
Solution Approach 2:
The patent creates a simplified measurement environment that copies the essential features of actual battery operation without requiring complex disassembly or specialized equipment. The jig replicates the necessary measurement conditions within a straightforward, easily manufactured structure.
Data Source
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AI summary
A jig for measuring a 3-electrode voltage of a secondary battery. The jig can measure charging and discharging voltages of a secondary battery in an environment similar to that of an actually used secondary battery by minimizing air contact and electrolyte use of a battery cell. In an embodiment, disclosed is a jig for measuring a 3-electrode voltage that comprises a jig body including a receiving part for mounting a secondary battery in which an electrode assembly is accommodated inside a case. The jig also includes a jig door that opens or closes a side of the jig body in which the receiving part is located. The jig further includes a cathode electrode that is mounted to the jig body, with the cathode electrode including a part being electrically connected to a cathode electrode tab protruding from upper portion of the secondary battery mounted in the receiving part, and with a part of the cathode electrode protruding to outside of the jig. An anode electrode is mounted to the jig body, with the cathode electrode being electrically connected to a conductive member electrically connected to the case of the secondary battery, and the cathode electrode having a part protruding to outside of the jig. A reference electrode penetrates a top plate of the jig body, is inserted into an electrolyte in a core of the secondary battery mounted in the receiving part, and protrudes upward from the jig body.