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High-energy lithium-ion battery and winding method therefor

A lithium-ion battery, high-energy technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of not being able to further improve battery energy, and achieve the effect of saving space and increasing battery capacity

Inactive Publication Date: 2016-04-06
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a high-energy lithium-ion battery and its winding method to solve the technical problem that the thinner battery in the prior art cannot further improve the energy of the battery

Method used

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  • High-energy lithium-ion battery and winding method therefor
  • High-energy lithium-ion battery and winding method therefor
  • High-energy lithium-ion battery and winding method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 2 and image 3 As shown, a high-energy lithium-ion battery includes a battery cell 1, the battery cell 1 is wrapped with a packaging film 2, and the tab 14 of the battery cell 1 passes through the packaging film 2;

[0034] The battery cell 1 includes a positive electrode plate 11 and a negative electrode plate 12. A separator 13 is provided between the positive electrode plate 11 and the negative electrode plate 12. The end of the positive electrode plate 11 is connected with a positive electrode empty foil area for connecting the tabs 14. The front side of the positive electrode plate 11 is provided with There are non-powder area and powder area, the back side of the positive plate 11 is the powder area, the end of the negative plate 12 is connected with a negative electrode empty foil area for connecting the tab 14, the front of the negative plate 12 is provided with a non-powder area and a powder area, the negative electrode The back side of the pla...

Embodiment 2

[0044] Such as Figure 4 Shown, a kind of winding method of high-energy lithium-ion battery comprises the following steps:

[0045] Winding: Pre-roll the empty foil area and non-powder area of ​​the negative electrode sheet for half a circle, and then insert the empty foil area and non-powder area of ​​the positive electrode sheet into the pre-rolled part, so that the empty foil area and non-powder area of ​​the negative electrode sheet are aligned with the The empty foil area and the non-powder area of ​​the positive electrode sheet are arranged opposite to each other, and the positive electrode sheet and the negative electrode sheet are wound into a cell 1;

[0046] Forming of the packaging film 2: punching the packaging film 2 with grooves through a mold;

[0047] Packaging: put the cell 1 into the groove of the packaging film 2, reserve 2.5mm for the width of the top seal, and heat seal it with a tab 14 heat sealer and a side sealer;

[0048] Liquid injection: move the b...

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Abstract

The invention discloses a high-energy lithium-ion battery and a winding method therefor. The high-energy lithium-ion battery comprises a battery core, wherein a packaging film coats the outside of the battery core; the battery core comprises a positive plate and a negative plate; a diaphragm is arranged between the positive plate and the negative plate; the tail end of the positive plate is connected with a positive blank foil region; the front surface of the positive plate is provided with a non-powder region and a powder region; the back surface of the positive plate is provided with the powder region; the tail end of the negative plate is connected with a negative blank foil region; the front surface of the negative plate is provided with the non-powder region and the powder region; and the back surface of the negative plate is provided with the powder region. According to the high-energy lithium-ion battery and the winding method therefor, the amount of active materials on the positive plate and the negative plate is improved by increasing the sizes and the widths of the powder region of the positive plate and the negative plate; and the capacity of the battery is improved when the thinning requirement of a soft package lithium-ion battery is met.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-energy lithium-ion battery and a winding method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products such as mobile phones, notebooks, mobile power supplies, and digital cameras due to their high energy density, long cycle life, and environmental protection. In recent years, more and more wearable electronic products use lithium-ion batteries as power sources. Wearable products are usually small in size. Ion batteries have a higher energy density. [0003] The volumetric energy density of small lithium-ion batteries is much smaller than that of large volumes. At present, the main way to increase energy density is to increase the charge cut-off voltage; in addition, maximizing the use of space and increasing the amount of active materials are also important to increase energy density. s method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 吴伟葛辉明吕正中刘金成
Owner EVE ENERGY CO LTD