Unlock instant, AI-driven research and patent intelligence for your innovation.

Square full-tab battery cell welding tensile test method

A tension test and all-pole technology, which is used in the application of stable tension/pressure to test the strength of materials, preparation of test samples, etc., can solve problems such as the inability to accurately reflect the welding effect of cells

Active Publication Date: 2019-03-29
CHINA AVIATION LITHIUM BATTERY LUOYANG
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a square full tab cell welding tension test method to solve the problem in the prior art that the sample test method cannot accurately reflect the welding effect of the actual cell

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Square full-tab battery cell welding tensile test method
  • Square full-tab battery cell welding tensile test method
  • Square full-tab battery cell welding tensile test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a schematic diagram of the cutting of the square all-tab cell of the present invention, as shown in the figure: it includes the first cell 1, the second cell 2, the negative full-tab 3, the soft connection 4, the cover assembly 5, and the cutting line 6 , the center line of the battery core 6-1, and the upper edge of the tab 6-2.

[0025] Among them, the first battery cell 1 and the second battery cell 2 are square winding all-tab batteries that are wound up by stacking the positive electrode sheet, the separator, the negative electrode sheet, and the separator; the positive electrode sheet and the negative electrode sheet are equipped with full Tab; the positive electrode sheet includes a positive electrode current collector and a positive electrode material layer coated on the positive electrode current collector. The positive electrode current collector is provided with a positive electrode blank area not coated with positive electrode material on one ...

Embodiment 2

[0035] Such as image 3 Shown: During the test, use two splints to respectively clamp the negative pole lug 3 and the electrode material part on both sides of the soft connection 4, each splint is composed of an upper clamp 7 and a lower clamp 8, and then connect the two clamps of the tensile machine Clamp the two splints respectively, apply a pulling force F, and test the pulling force when the welding print between the soft connection 4 and the negative full tab 3 is pulled apart, as the maximum that the soft connection 4 and the negative full tab 3 can withstand Tension value, the greater the maximum tension value, the better the welding effect.

[0036] In the test method of this embodiment, the splint is used to clamp the tab and the electrode material at the same time, which increases the force-bearing area, and during the test process, the electrode material is directly stressed. When the electrode material is elastically deformed under force, the tension is indirectly ...

Embodiment 3

[0038] Such as Figure 4 Shown: When preparing the cell test body, use the same pole piece and diaphragm as the square full tab battery, and use the same winding method to prepare two half-cells 9, and the pole piece layer of each half-cell 9 The number of layers is half of the number of layers of square full-tab battery pole pieces; each half-cell 9 has its own tab and soft connection; weld the tabs at the ends of the same polarity of the two half-cells 9 in the same direction together, and then unfold the non-welded ends of the two half-cells 9 in opposite directions to obtain a cell test body. The tab 10 after welding, the soft connection 11 after welding are as Figure 4shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a square full-tab battery cell welding tensile test method, which belongs to the technical field of battery testing. The method comprises the steps that 1) a battery cell test body is prepared, wherein the battery cell test body comprises tabs and soft connections welded on the tabs; each tab comprises more than two layers of stacked current collectors, and each soft connection is welded on the outermost surface of a tab; and 2) parts on both sides of each soft connection on the battery cell test body are stretched in opposite directions respectively, and the tensile force is tested when the soft connections are disconnected from the tabs or the tensile force is tested when the tabs are disconnected from the tabs to acquire welding tensile force. According to the invention, an actual battery cell is cut to prepare the battery cell test body or the same process and materials are used to prepare the battery cell test body with the same number of layers and the sametab welding form as an actual battery cell pole piece; since the prepared battery cell test body is equivalent to the actual battery cell, the welding tensile test result of the battery cell test body can truly reflect the welding effect of the actual battery cell.

Description

technical field [0001] The invention relates to a welding tension test method for square all-tab electric cores, which belongs to the technical field of battery testing. Background technique [0002] In modern society, lithium batteries are widely used in mobile phones, computers and electric vehicles. In the production process of lithium batteries, the welding effect of lithium battery cells has a major impact on the performance of lithium batteries. The welding effect of the battery core is effectively tested. [0003] For the verification of the welding effect of the all-tab structure lithium battery cell, due to its own structural limitations, the commonly used test method in the battery industry is to use the sample to replace the actual cell for testing, and use the welding effect of the sample to reflect the actual cell. Welding effect, but the current sample test method has the following disadvantages: 1. The copper and aluminum foil materials used in the sample si...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N3/08
Inventor 宗云峰赵成果张伟陈明
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG