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Cylindrical battery roll core internal stress test method

A technology of cylindrical battery and test method, applied in the direction of tension measurement, secondary battery, circuit, etc., can solve the problem of inability to test the stress of winding core, and achieve the effect of improving consistency

Inactive Publication Date: 2018-02-23
DONGGUAN CHUANGMING BATTERY TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for testing the internal force of a cylindrical battery core, aiming to solve the technical problem that the stress-strain test method in the prior art cannot test the stress between different layers inside the core

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  • Cylindrical battery roll core internal stress test method
  • Cylindrical battery roll core internal stress test method
  • Cylindrical battery roll core internal stress test method

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Embodiment Construction

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] Such as Figure 1~4 As shown, the embodiment of the present invention provides a method for testing the internal force of a cylindrical battery core, including the following steps:

[0028] S1: provide a hard lead wire 10, and wrap the hard lead wire 10 together with the positive electrode sheet 31 and the A battery winding core 30 is formed in the separator 33 or the negative electrode sheet 32 ​​and the separator 33, and the stress of the battery winding core 30 acting on the hard lead 10 is F;

[0029] S2: Provide a t...

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Abstract

The invention belongs to the technical field of battery manufacture and especially relates to a cylindrical battery roll core internal stress test method. The method comprises the following steps: S1)providing a hard lead, and rolling the hard lead into an anode piece and a diaphragm or a cathode piece and the diaphragm to form a battery roll core in the process where a battery coiler coils the anode piece, the diaphragm and the cathode piece, stress applying by the battery roll core to the hard lead being F; S2) providing a pulling force tester, a clamper of the pulling force tester clampingthe end, exposed out of the battery roll core, of the hard lead and pulling the hard lead; and S3) reading tensile force f of the pulling force tester in pulling the hard lead, and calculating F=f / muaccording to a formula f=mu*F, wherein the mu is a constant value. The stress F in different layers of the battery roll core can be represented by pulling force f of the pulling force tester; and bycomparing stress difference between the different layers, stress distribution of the battery coiler in the coiling process can be optimized, and furthermore, performance of consistency, circulation and rate of the battery roll core can be improved.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a test method for internal force of a cylindrical battery winding core. Background technique [0002] Cylindrical lithium-ion batteries have a multi-layer winding structure of positive electrode, negative electrode, and separator. During the charging and discharging process of the battery, the expansion and contraction of the positive electrode will affect the distribution of the electrolyte in the winding core, the conduction of lithium ions, and the stress on the foil. etc. have an important impact. Therefore, studying the force difference between different layers inside the winding core and optimizing the tension distribution of the winding machine during the winding process has an important impact on improving the consistency, cycle, and rate performance of cylindrical lithium-ion batteries. The existing methods for studying internal stress are main...

Claims

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Application Information

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IPC IPC(8): G01L5/04G01L5/06H01M10/0525
CPCG01L5/04G01L5/06H01M10/0525Y02E60/10
Inventor 周崇旺罗国恩杨俊赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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