# US 2018/0323481 A1 · Method for testing semi-finished battery cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323481 A1 - Document ID: US20180323481A1 - Status: Published application - Kind: A1 - Application number: 15/912,222 - Filed: 2018-03-05 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: Chroma Ate Inc. - Applicants: Chroma Ate Inc. - Inventors: Chih-Ming TSAI; Chao-Hsu CHEN; Han-Chou LIAO; Chung-Yu SIANG - Web page: https://patentgrep.com/patent/US20180323481A1 ## CPC - G01R 31/1263: {of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation} - H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) - G01R 19/16542: {for batteries (charge condition monitoring in G01R31/36)} - G01R 31/3865: {related to manufacture, e.g. testing after manufacture} - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A method is provided for testing a semi-finished battery cell. The semi-finished battery cell is charged with a constant current when a voltage difference between the first conductor and the second conductor is less than a voltage threshold. The semi-finished battery cell is charged with a constant voltage when the voltage difference between the first conductor and the second conductor is equal to or larger than the voltage threshold. An overall electric quantity is obtained after a default time period, wherein the overall electric quantity is an electric quantity charged to the semi-finished battery cell with the constant current during the default time period. Accordingly, an insulation related to electrodes of the semi-finished battery cell is determined as poor when the overall electric quantity is larger than an electric quantity threshold. ## Claims ### Claim 1 A method for testing a semi-finished battery cell, the semi-finished battery cell including a first electrode and a second electrode, with said first and second electrodes disposed in a pile, with an insulation layer disposed between the first electrode and the second electrode, with the first electrode electrically connected to a first conductor, and with the second electrode electrically connected to a second conductor, the method comprising: charging the semi-finished battery cell with a constant current when a voltage difference between the first conductor and the second conductor is less than a voltage threshold; charging the semi-finished battery cell with a constant voltage when the voltage difference between the first conductor and the second conductor is equal to or larger than the voltage threshold; obtaining an overall electric quantity after a default time period, wherein the overall electric quantity is an electric quantity charged to the semi-finished battery cell with the constant current during the default time period; and determining whether the overall electric quantity is larger than an electric quantity threshold, wherein an insulation between the first electrode and the second electrode of the semi-finished battery cell is determined as poor when the overall electric quantity is larger than the electric quantity threshold. ### Claim 2 (depends on 1) The method according to claim 1, wherein the default time period covers a part of a time period when the semi-finished battery cell is charged with the constant voltage. ### Claim 3 (depends on 2) The method according to claim 2, further comprising: measuring an overall time in which the semi-finished battery cell is charged with the constant current, and obtaining the overall electric quantity according to the constant current and the overall time. ### Claim 4 (depends on 2) The method according to claim 2, further comprising: measuring a plurality of current charging time periods in which the semi-finished battery cell is charged with the constant current; obtaining a plurality of current charging electric quantities according to the constant current and the plurality of current charging time periods; and determining whether each of the current charging electric quantities is larger than a respective one of a plurality of electric quantity thresholds, wherein an insulation between the first electrode and the second electrode of the semi-finished battery cell is determined as poor when one of the current electric charging quantities is larger than the corresponding electric quantity threshold. ### Claim 5 (depends on 1) The method according to claim 1, further comprising: calculating the overall electric quantity charged to the semi-finished battery cell with the constant current after beginning charging the semi-finished battery cell with the constant voltage. ### Claim 6 (depends on 5) The method according to claim 5, further comprising: measuring an overall time in which the semi-finished battery cell is charged with the constant current before charging the semi-finished battery cell with the constant voltage, and performing an integration calculation according to the constant current and the overall time to obtain the overall electric quantity. ### Claim 7 (depends on 1) The method according to claim 1, wherein the electric quantity threshold is a sum of an ideal charging quantity corresponding to the semi-finished battery cell and a tolerance value. ### Claim 8 (depends on 1) The method according to claim 1, further comprising: charging the semi-finished battery cell with the constant current when the voltage difference between the first conductor and the second conductor is less than the voltage threshold in a reference time period, wherein the reference time period is in advance of the default time period; charging the semi-finished battery cell with the constant voltage when the voltage difference between the first conductor and the second conductor is equal to or larger than the voltage threshold in the reference time period; and obtaining a reference overall electric quantity charged to the semi-finished battery cell with the constant current in the reference time period, wherein the electric quantity threshold is a sum of the reference overall electric quantity and a tolerance value.