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Lithium ion battery as well as preparation method thereof and lithium-ion battery pack

A lithium-ion battery pack, lithium-ion battery technology, applied in battery pack components, secondary batteries, secondary battery repair/maintenance, etc., can solve the problem that the rate performance cannot be fully utilized, the heat dissipation efficiency is low, and the battery charging time is reduced. and other problems, to achieve the effect of improving high-rate charge and discharge performance, improving heat dissipation efficiency, and optimizing current density

Active Publication Date: 2013-10-09
惠州市诺威新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of low heat dissipation efficiency and inability to give full play to the rate performance in the above-mentioned prior art, the present invention provides a lithium-ion battery and a lithium-ion battery pack, which not only have high heat dissipation efficiency, but also It can give full play to the rate performance of the battery and effectively reduce the charging time of the battery

Method used

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  • Lithium ion battery as well as preparation method thereof and lithium-ion battery pack
  • Lithium ion battery as well as preparation method thereof and lithium-ion battery pack
  • Lithium ion battery as well as preparation method thereof and lithium-ion battery pack

Examples

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Effect test

Embodiment 1

[0059] The positive plate is made of nickel-cobalt lithium manganate, the negative plate is made of natural graphite, and the separator is a lithium-ion battery separator with a thickness of 20um. The positive and negative plates are separated by the diaphragm by winding. Open, the two ends of the positive and negative electrodes are respectively reserved for the positive and negative end faces beyond the diaphragm, the positive electrode plate on the positive end face is 1mm beyond the diaphragm, the negative electrode plate on the negative end face is 1mm beyond the diaphragm, and the diaphragm exceeds the lower edge of the positive and negative electrodes by 1mm, so as to prepare a height of 14mm , A pole group with a diameter of 64mm, the pole group is packaged in a metal shell with a diameter of 66mm and a height of 16mm to prepare a lithium-ion battery with a capacity of 5Ah. The lithium-ion battery prepared by this preparation process is regarded as lithium-ion battery A1...

Embodiment 2

[0082] According to the lithium-ion battery preparation method provided by the present invention, the positive plate is made of traditional nickel-cobalt lithium manganate, the negative plate is made of traditional natural graphite, and the separator is a lithium-ion battery separator with a thickness of 20um. The positive and negative plates are separated by the diaphragm, and the positive and negative end faces of the positive and negative electrodes are respectively reserved beyond the diaphragm. The bottom edge of the pole is 1mm, and a pole group with a height of 24mm and a diameter of 64mm is prepared. The pole group is packaged in a metal shell with a diameter of 66mm and a height of 26mm to prepare a lithium-ion battery with a capacity of 10Ah. The battery prepared by this preparation process is counted as Battery A4.

[0083] The battery rate charge and discharge, cycle life, process consistency and safety evaluation methods are the same as those in Example 1.

Embodiment 3

[0085] According to the lithium-ion battery preparation method provided by the present invention, the positive plate is made of traditional nickel-cobalt lithium manganate, the negative plate is made of traditional natural graphite, and the separator is a lithium-ion battery separator with a thickness of 20um. The positive and negative plates are separated by the diaphragm, and the positive and negative end faces of the positive and negative electrodes are respectively reserved beyond the diaphragm. The bottom edge of the pole is 1mm, and a pole group with a height of 34mm and a diameter of 64mm is prepared. The pole group is packaged in a metal shell with a diameter of 66mm and a height of 36mm to prepare a lithium-ion battery with a capacity of 15Ah. The battery prepared by this preparation process is counted as Battery A5.

[0086] The battery rate charge and discharge, cycle life, process consistency and safety evaluation methods are the same as those in Example 1.

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Abstract

The invention relates to the technical field of batteries, and discloses a lithium ion battery. The lithium ion battery comprises a sealing device with a positive electrode and a negative electrode as well as a battery polar group which is arranged inside the sealing device, wherein the battery polar group comprises a positive plate, a negative plate and an insulation layer, and the positive plate and the negative plate are mutually coiled or laminated to form a flat structure; the insulation layer is arranged between the positive plate and the negative plate and used for separating the positive plate from the negative plate; on one end surface of the flat structure formed by coiling or laminating the positive plate and the negative plate, the positive plate is higher than the insulation layer, and the positive plate which is higher than the insulation layer is connected with the positive electrode on the sealing device through metal; on the other end surface of the flat structure formed by coiling or laminating the positive plate and the negative plate, the negative plate is higher than the insulation layer, and the negative plate which is higher than the insulation layer is connected with the negative electrode on the sealing device through the metal. The invention also discloses a preparation method of the lithium ion battery and a lithium-ion battery pack.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a lithium ion battery and a preparation method thereof, and also to a lithium ion battery pack. Background technique [0002] Lithium-ion batteries are widely used in modern society due to their advantages of high voltage, large specific energy, long cycle life and good safety performance. Existing lithium ion batteries can be divided into three types according to their structures, namely cylindrical batteries, square batteries and button batteries. The above three types of lithium ion batteries have their own advantages and disadvantages. Among them, the advantage of the cylindrical battery is that its cylindrical structure has a strong binding force on the battery pole group, the battery will not have problems such as expansion and collapse of the pole group during the cycle, and its stability is good; at the same time, due to the cylindrical shape The tabs of the battery are welded o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/26H01M10/42H01M10/50H01M50/531H01M50/534
CPCY02E60/10Y02P70/50
Inventor 田秀君
Owner 惠州市诺威新能源有限公司
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