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A battery forming device and method for improving the wrinkle deformation of square lithium-ion batteries

A molding device and molding method technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of affecting battery cycle performance, increased expansion and rebound, poor contact between pole pieces and diaphragms, etc., to reduce wrinkling Deformation rate, improve the effect of wrinkle deformation

Active Publication Date: 2020-03-24
LINKDATA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the expansion and rebound of the internal pole piece in different directions to intensify after multiple cycles and high current charging and discharging. The inside of the battery core cannot move due to the limitation of the width direction, and the pole piece expands and squeezes inward in the width and thickness directions. Causes "S" shape deformation, poor contact between the pole piece and the diaphragm inside the battery, affects the subsequent cycle performance of the battery, and even causes the battery to bulge and explode

Method used

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  • A battery forming device and method for improving the wrinkle deformation of square lithium-ion batteries
  • A battery forming device and method for improving the wrinkle deformation of square lithium-ion batteries
  • A battery forming device and method for improving the wrinkle deformation of square lithium-ion batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Using the battery forming method for improving the wrinkling and deformation of the square lithium-ion battery provided by the present invention, the square lithium-ion battery is formed, and the steps are as follows:

[0074] Step 1, after the positive electrode sheet 101 is pretreated by the positive electrode sheet processing unit 100, it is transferred to the positive electrode sheet transfer unit 300, and the positive electrode sheet transfer unit 300 then transfers the positive electrode sheet 101 to the needle rolling mechanism 700; The sheet 101 is processed in the following manner: the positive electrode sheet discharging mechanism 102 outputs the positive electrode sheet 101; then, the positive electrode sheet hot pressing roller mechanism 103 rolls the positive electrode sheet 101 once, and the rolling temperature is 80°C; then, the positive electrode sheet tension adjustment mechanism 104 adjust the tension of the positive electrode sheet 101 after the primar...

Embodiment 2

[0092] Compared with Example 1, there are only differences in the following process parameters in this embodiment:

[0093] In this embodiment, in step 1, both the first diaphragm 501 and the second diaphragm 601 are coated diaphragms that are coated with polyvinylidene fluoride layers on both sides on the basis of the base film.

[0094] In step 1, when the positive electrode sheet is rolled, the rolling temperature is 50°C; when the negative electrode sheet is cold rolled at room temperature, the rolling temperature is 20°C; when the negative electrode sheet is pre-baked at high temperature, the high-temperature pre-baked The temperature is 70°C, and the tape transport and baking time is 0.3min;

[0095] In step 2, the distance between the head of the positive electrode sheet 101 and the head of the negative electrode sheet 201 is 5mm; when the needle winding mechanism is winding, the tension of the positive electrode sheet 101 and the negative electrode sheet 201 is control...

Embodiment 3

[0097] Compared with Example 1, there are only differences in the following process parameters in this embodiment:

[0098] In this embodiment, in step 1, both the first diaphragm 501 and the second diaphragm 601 are coated diaphragms that are coated with ceramics on one side on the basis of the base film.

[0099] In step 1, when the positive electrode sheet is rolled, the rolling temperature is 90°C; when the negative electrode sheet is cold rolled at room temperature, the rolling temperature is 30°C; when the negative electrode sheet is pre-baked at high temperature, the high-temperature pre-baked The temperature is 110°C, and the tape transport and baking time is 2.8 minutes;

[0100] In step 2, the distance between the head of the positive electrode sheet 101 and the head of the negative electrode sheet 201 is 9mm; when the needle winding mechanism is winding, the tension of the positive electrode sheet 101 and the negative electrode sheet 201 is controlled between 900gf;...

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Abstract

The invention provides a cell forming device and method for improving wrinkling and deformation of a square lithium-ion cell. The device includes a positive electrode sheet processing unit, a negative electrode sheet processing unit, a positive electrode sheet transmission unit, a negative electrode sheet transmission unit, a first diaphragm transmission unit, The second diaphragm transfer unit, needle rolling mechanism, glue roller, platen mechanism and conveyor belt. The needle winding mechanism winds the first separator, the negative electrode sheet, the second separator and the positive electrode sheet sequentially stacked from the inside to the outside to obtain the wound cell; the glue roller applies glue to the side of the wound cell; The glued winding cell is separated from the rolling needle mechanism and transferred to the pressing plate mechanism; the pressing plate mechanism performs heat-pressing treatment on the winding cell, and heat-presses the winding cell into a square lithium-ion cell. The advantages are: it can greatly reduce the occurrence rate of wrinkling and deformation of the square lithium ion battery, and the wrinkling deformation rate is reduced from 10% to about 1%, which has practical significance and is applicable to continuous large-scale production.

Description

technical field [0001] The invention belongs to the technical field of forming lithium-ion batteries, and in particular relates to a battery-forming device and method for improving wrinkling and deformation of square lithium-ion batteries. Background technique [0002] With the development of new energy technology, electric vehicles are favored because of their low pollution, low exhaust emissions and even zero emissions. As the power source of electric vehicles, lithium-ion batteries have also attracted widespread attention from all walks of life. At present, lithium-ion batteries are mainly divided into cylindrical, soft pack, and square batteries in terms of appearance. Among them, square batteries are the most widely used in power vehicles. The main reason is that square batteries have high capacity, high mechanical strength, and pack assembly rate. Advanced advantages. [0003] However, as the country's subsidy policies for new energy vehicles continue to change, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0587
CPCH01M10/058H01M10/0587Y02E60/10Y02P70/50
Inventor 蒋濛王进杨六香胡庆波
Owner LINKDATA NEW ENERGY CO LTD
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