Square lithium ion battery winding cell and manufacturing method for same

A technology of lithium-ion battery and manufacturing method, which is applied in the field of square-shaped lithium-ion battery winding cells and its production, and can solve problems such as easy powder dropping, pole piece deformation, and easily wrinkled and deformed pole piece, so as to maintain consistency , Avoid deformation problems, weaken the effect of pole piece deformation and wrinkling

Active Publication Date: 2015-10-07
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention provides a square lithium-ion battery winding cell and its manufacturing method, which solves the problem that the square winding cell electrode piece produced by the existing technology is easy to wrinkle and deform during use and extremely The powder is easy to fall off at the bend of the sheet, and the deformation of the electrode sheet is avoided

Method used

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  • Square lithium ion battery winding cell and manufacturing method for same
  • Square lithium ion battery winding cell and manufacturing method for same
  • Square lithium ion battery winding cell and manufacturing method for same

Examples

Experimental program
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Embodiment 1

[0043] Such as Figure 1~Figure 3 As shown, a winding cell of a square lithium-ion battery includes a positive electrode sheet 1, a diaphragm 2 and a negative electrode sheet 3, the positive electrode sheet 1 is provided with a positive electrode tab 11, and the negative electrode sheet 3 is provided with a negative electrode tab 32 , the center of the winding cell of the square lithium-ion battery is provided with an internal support frame, the internal support frame is an insulating coil pin 4, and the size of the insulating coil pin 4 is: the thickness T1 is 10mm, and the length W1 is 280mm , the width H1 is 230 mm, such as figure 2 As shown; the size of the finished cell is: the cell thickness T2 is 40mm, the cell length W2 is 310mm, and the cell width H2 is 230mm; shape; the material of the insulating winding pin 4 is PTFE; the positive electrode tab 11 and the negative electrode tab 31 are located on the same side of the insulating rolling pin 4 .

[0044] The design ...

Embodiment 2

[0047] On the basis of Example 1, such as Figure 1~Figure 3 As shown, a winding battery cell of a square lithium-ion battery, the material of the insulating rolling pin 4 in this example is PP, and the size of the insulating rolling pin 4 is: thickness T1 is 5 mm, length W1 is 215 mm, width H1 is 210 mm, such as figure 2 As shown; the size of the finished cell is: cell thickness T2 is 20mm, cell length W2 is 230mm, and cell width H2 is 210mm; the cross-section of the outer surface of the left and right side walls of the insulating needle 4 is a semicircular arc shape; the positive pole tab 11 and the negative pole tab 31 are located on the same side of the insulating needle 4 .

[0048] The design capacity of the finished cell is 45Ah, 3.2V. The positive electrode 1 is lithium iron phosphate, the negative electrode 3 is graphite, and the electrodes are arranged in a sandwich structure.

[0049] Such as Figure 5 As shown, when 16 batteries are used in series, the dynamic ...

Embodiment example 3

[0051] Such as figure 1 with Image 6 As shown, a winding cell of a square lithium-ion battery includes a positive electrode sheet 1, a diaphragm 2 and a negative electrode sheet 3, the positive electrode sheet 1 is provided with a positive electrode tab 11, and the negative electrode sheet 3 is provided with a negative electrode tab 32 , the center of the winding cell of the square lithium-ion battery is provided with an internal support frame, the internal support frame is a hollow support 5, and the hollow support 5 is formed by winding and bonding pole pieces; the positive pole lug 11 and the negative pole tab 31 are located on the same side of the hollow bracket 5 .

[0052] The hollow bracket 5 is a bracket structure formed by applying glue to the semicircular position where the pole piece bends during the pole piece winding process, so that the pole pieces are bonded together as a whole. The winding and bonding part of the pole piece is a material blank area. First, d...

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Abstract

The invention provides a square lithium ion battery winding cell and a manufacturing method for the same. The square lithium ion battery winding cell comprises a positive pole piece, a diaphragm and a negative pole piece, wherein the positive pole piece is provided with a positive tab; the negative pole piece is provided with a negative tab; an internal supporting frame is arranged in the center of the square lithium ion battery winding cell. By the adoption of the technical scheme, the problems of easy deformation of pole pieces of a conventional square winding cell in charge-discharge cycles and easy disengagement of materials at semicircular positions of the bent pole pieces are solved, the consistency of a square lithium ion battery in a static state and a charge-discharge cycle dynamic state is maintained to the greatest extent, the production qualification rate of winding cells and the safety of the square lithium ion battery are improved, and conditions are created for reliable application of the square winding cell to the field of power batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a square-shaped lithium-ion battery winding cell and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy, small size, and no pollution. They are clean energy that the country is vigorously developing. Square lithium-ion batteries are widely used in power batteries due to their advantages of large capacity and convenient use. The power battery is a series of batteries used in series. In order to ensure the practicability and safety of the power battery, higher requirements are placed on the consistency between the single cells used in series, not only the consistency of static capacity and voltage , and the step-up rate and step-down rate are required to be consistent at all times during the charging and discharging process. [0003] In the production process of lithium-ion batteries, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/10H01M50/202
CPCH01M10/0587H01M50/20Y02E60/10Y02P70/50
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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