Preparation method of cylindrical battery and cylindrical battery

By conducting internal resistance testing in the winding process and groove rolling process of cylindrical batteries, qualified core and semi-finished batteries are screened out, which solves the problem of the inability to effectively screen short-circuit batteries in the prior art, and achieves more efficient and accurate detection and ensures product quality.

CN119674167AActive Publication Date: 2025-03-21HIGHPOWER TECH HUIZHOU
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Patent Information

Application Number
CN202510195515.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-03-21
Estimated Expiration
2045-02-21

AI Technical Summary

Technical Problem

In the prior art, short-circuited cylindrical batteries cannot be effectively screened, resulting in missed or missed cases in the assembly process, and there are short-circuit safety hazards during the use of the battery.

Method used

By conducting internal resistance tests in the winding process and the groove rolling process, qualified core and semi-finished batteries are selected to ensure that their internal resistance meets certain standards and avoid short circuits. Specific methods include using winding equipment and rolling equipment, combined with an insulation internal resistance tester, for voltage testing and internal resistance measurement.

Benefits of technology

This method can effectively screen out short-circuit batteries without adding too much production time, reduce leakage or wrong killing, improve detection efficiency and accuracy, and ensure the stability of product quality.

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Abstract

In order to solve the problem that short-circuited cylindrical batteries cannot be effectively screened in the prior art, the invention provides a preparation method of a cylindrical battery and the cylindrical battery. The preparation method of the cylindrical battery comprises the following steps: forming a roll core by a positive plate, a diaphragm and a negative plate; the first internal resistance test equipment tests the internal resistance of the roll core, and the single roll core test time is less than or equal to the winding beat of the winding equipment; if the test internal resistance of the roll core is smaller than the first internal resistance, the roll core is short-circuited, and if the roll core internal resistance is larger than or equal to the first internal resistance, the roll core is qualified; putting the qualified roll core into a shell, and carrying out groove rolling on the shell to obtain a semi-finished battery; the second internal resistance test equipment tests the internal resistance of the semi-finished batteries, and the test time of a single semi-finished battery is less than or equal to the channeling beat of the channeling equipment; if the internal resistance of the semi-finished battery is smaller than the second internal resistance, the battery is short-circuited, and if the internal resistance of the semi-finished battery is larger than or equal to the second internal resistance, the battery is qualified. According to the preparation method provided by the invention, detection can be more accurately completed within limited time, and the detection efficiency and accuracy are improved.
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