Lithium ion battery and manufacturing method thereof

A lithium ion battery and a manufacturing method technology are applied in the field of lithium ion batteries and their manufacturing, which can solve the problems of high equipment cost and manufacturing cost, increase the probability of micro-short circuit, hidden danger of battery safety, etc., so as to improve the safety performance of the battery and reduce the micro-short circuit. Probability, the effect of reducing equipment cost

Inactive Publication Date: 2011-06-29
SHENZHEN EPT BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of method is complex in process, and the equipment cost and production cost are all high
Moreover, each small piece has four trimming edges, which are prone to burrs, and the probability of micro-short circuit caused by the trimming burrs of the battery is greatly increased, causing an important safety hazard for this type of battery

Method used

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  • Lithium ion battery and manufacturing method thereof
  • Lithium ion battery and manufacturing method thereof
  • Lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a lithium-ion battery includes a battery core, a casing, and an electrolyte. The battery core includes a first positive electrode sheet 1 , a first separator 2 and a first negative electrode sheet 3 . One side of the first positive electrode sheet 1 is coated with positive electrode material, and one side of the first negative electrode sheet is coated with negative electrode material. The first positive electrode sheet 1 , the first diaphragm 2 and the first negative electrode sheet 3 are sequentially stacked and folded repeatedly to form a continuous laminate. The first positive electrode sheet 1 , the first separator 2 and the first negative electrode sheet 3 can be repeatedly folded in a Z shape.

[0033] The manufacturing method of this embodiment is as follows: the positive electrode material 12 is coated on one side of the positive electrode foil 11 , and a metal strip is welded to make the first positive electrode sheet 1 . The nega...

Embodiment 2

[0035] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the battery core further includes a second positive electrode sheet 5 and a second separator 4 . One side of the second positive electrode sheet 5 is coated with positive electrode material, and the other side of the first negative electrode sheet is also coated with negative electrode material. The second separator 4 , the second positive electrode sheet 5 , the first positive electrode sheet 1 , the first separator 2 and the first negative electrode sheet 3 are sequentially stacked and folded repeatedly to form a continuous laminate.

[0036] The manufacturing method of this embodiment is as follows: the positive electrode material 12 is coated on one side of the positive electrode foil 11 , and the tabs are left empty on the foil, and the first positive electrode sheet 1 with multiple tabs is formed by laser cutting. The positive electrode material 52 is coated on one side of...

Embodiment 3

[0038] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 is that the battery core further includes a second negative electrode sheet 5 ′ and a second separator 4 . One side of the second negative electrode sheet 5' is coated with negative electrode material, and the other side of the first positive electrode sheet 1 is also coated with positive electrode material. The second negative electrode sheet 5', the second separator 4, the first negative electrode sheet 3, the first separator 2 and the first positive electrode sheet 1 are sequentially stacked and folded repeatedly to form a continuous laminate.

[0039]The manufacturing method of this embodiment is as follows: the negative electrode material 32 is coated on one side of the negative electrode foil material 31 , the foil material is left with empty foils for tabs, and the first negative electrode sheet 3 with multiple tabs is formed by laser cutting. The negative electrode material 52' i...

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PUM

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Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises a battery cell, a shell and electrolyte, wherein the battery cell comprises a first positive plate, a first diaphragm and a first negative plate; and the first positive plate, the first diaphragm and the first negative plate are overlaid in turn and then are repeatedly folded to form continuous laminates. The invention also provides a manufacturing method of the lithium ion battery. The method comprises the following steps of: manufacturing the first positive plate and the first negative plate; overlaying the first positive plate, the first diaphragm and the first negative plate in turn, and repeatedly and continuously folding to manufacture the battery cell; and arranging the shell, injecting the electrolyte, and forming to manufacture the lithium ion battery. The laminates of the battery cell are formed by repeated folding, so that micro-short circuit probability caused by burrs on slice edges of the laminates is reduced, and the safety performance of the battery is improved. Punching and repeated addition of a plurality of fragments are saved, so lamination efficiency is greatly improved, and production cost is dramatically reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery and a manufacturing method thereof. Background technique [0002] With the continuous development of technology, the performance of mobile devices such as mobile phones, cameras, and notebook batteries is also undergoing earth-shaking changes. At the same time, the requirements for lithium-ion batteries are also getting higher and higher. For example, the functions of these devices are becoming more and more complex, and higher requirements are placed on the high-rate discharge performance of the battery. Recently, due to the continuous improvement of people's environmental awareness, the environmental protection performance of products is also increasingly advocated. Electric vehicles have non-polluting characteristics, so the trend of replacing traditional vehicles is becoming more and more obvious, but the development of battery vehicles depends larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/0583
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50
Inventor 桑成涛王守军袁磊李世隆
Owner SHENZHEN EPT BATTERY
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