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Lithium ion secondary cell

A secondary battery, lithium ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of large internal resistance, high-rate discharge performance and poor safety performance, achieve small self-discharge, simple manufacturing process, The effect of superior rate discharge characteristics and cycle characteristics

Inactive Publication Date: 2004-08-18
BYD CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to improve the prior art lithium-ion secondary battery internal resistance is relatively large, high-rate discharge performance and poor safety performance, thereby providing a high-safety performance, high-rate discharge characteristics and excellent cycle characteristics, production Lithium-ion power battery with outstanding advantages such as simple process

Method used

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Embodiment Construction

[0032] Please refer to figure 1 , the lithium-ion secondary battery of the present invention, which includes a laminated battery pole core 1, a clamping device 2, a battery case 3, a connecting piece 4, 4' at the upper and lower ends, and a connecting piece 5, 5' respectively, Each clip 6, 6', each spacer 7, 7', each battery cover 8, 8', each pole 13, 13'.

[0033] Please refer to figure 2 The lithium-ion secondary battery of the present invention forms a laminated battery pole core 1 through the bag-type diaphragm case 9, that is, at least one of the positive and negative electrode sheets 10 is inserted into the bag-type diaphragm case 9 and stacked. In this way, the original very long pole piece can be divided into several small pieces, thereby greatly reducing the difficulty of battery assembly. The bag-type diaphragm sleeve 9 is formed by high-temperature welding of the periphery of the diaphragm to form a single-side open bag structure. The pole piece 10 is inserted f...

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Abstract

A lithium ion secondary battery comprises a positive electrode, a negative electrode, electrolytic solution and barrier diaphragm, wherein the battery pole core is laminated by inserting the positive and negative electrode sheets of the bag type barrier diaphragm, the positive and negative electrodes are in current collecting arrangement fixed by screws or rivets, and are connected through the top and bottom covering plates through specific coupling pieces, the pole piece member, the battery case and the battery cover plate are in close fit so as to form a battery member having a secured pole piece. The lithium ion secondary battery provided by the invention has the advantages of high safety, high magnification of flash-over characteristic and simple manufacturing process.

Description

【Technical field】 [0001] The invention relates to a secondary battery, in particular to a lithium-ion power battery with high safety performance, superior high-rate discharge characteristics and cycle characteristics. 【Background technique】 [0002] With the widespread use of various portable electronic products, lithium-ion secondary batteries are favored for their many superior properties such as high voltage, large specific energy, small self-discharge and no memory effect. In the civilian field, lithium-ion secondary batteries with a capacity of hundreds to thousands of mAh and low-to-medium power output have been successfully commercialized, and the world's total output has reached about 500 million per year. Recently, lithium-ion batteries with high capacity and high power output have also been studied, and their application directions are mainly electric vehicle power batteries, aerospace vehicle power supplies, and industrial and household energy storage systems. Li...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/40
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 沈晞朱建华王传福董俊卿
Owner BYD CO LTD
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