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Cylindrical lithium ion battery

A lithium-ion battery, cylindrical technology, used in secondary batteries, battery pack components, circuits, etc., can solve problems such as protruding, larger cells, and difficulty in entering the shell, so as to improve safety performance and prevent virtual welding. Effect

Active Publication Date: 2014-10-15
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned current state of the art, the technical problem to be solved by the present invention is to provide a cylindrical lithium-ion battery, which is easy to compress between the pole plate and the tab, and is not easy to cause the cell to become larger or protrude. In order to solve the problem of difficulty in entering the shell and welding due to large capacity

Method used

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  • Cylindrical lithium ion battery

Examples

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Embodiment 1

[0024] The cylindrical lithium-ion battery of this embodiment includes a battery cell, a positive pole plate, a negative pole plate, a positive pole pole, and a negative pole pole. There is a positive electrode lug not coated with active material formed by the axial extension of the positive electrode sheet, and the other end of the cell has a negative electrode ear not coated with active material formed by the axial extension of the negative electrode sheet. Preferably, the material of the positive electrode plate is aluminum or aluminum alloy, and the material of the negative electrode pole is aluminum, aluminum alloy, copper and copper alloy materials. Preferably, the positive tab is made of lithium iron phosphate, lithium manganate, or ternary materials. The negative electrode tab is graphite or lithium titanate.

[0025] The connection method between the negative electrode lug and the negative electrode plate and the negative electrode column is similar to the connection...

Embodiment 2

[0030] Such as Figure 4 , 5 As shown, the structure of the lithium ion battery in this embodiment is generally the same as that in Embodiment 1, the difference is that: the outer diameter of the first protrusion 221 of the positive electrode plate 20 is the same as the outer diameter of the first substrate, and the outer diameter of the first protrusion 221 is the same as that of the first substrate. A liquid inlet hole 24 includes 4 arc-shaped voids on the first substrate portion 22 .

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Abstract

The invention discloses a cylindrical lithium ion battery, which comprises an electric core, a positive plate, a negative plate, a positive pole column and a negative pole column, the electric core is prepared by coiling a positive pole piece, a diaphragm and a negative pole piece, one end of the electric core is provided with a positive pole ear, the other end of the electric core is provided with a negative pole ear, the positive plate is stamped with a first clamping groove, a positive plate side face back to the first clamping groove is closely attached to the end face of the positive pole ear, and welded and fixed by the first clamping groove; the negative plate is stamped with a second clamping groove, the negative plate side face back to the second clamping groove is closely attached to the end face of the negative pole ear, and welded and fixed by the second clamping groove. Because of adopting of the structure of the cylindrical lithium ion battery, pole ears can be partially pressed and easily pressed, the cylindrical lithium ion battery is easy to realize the electric connection through laser welding, and prevents the pseudo soldering, unsoldering and other phenomena; and the groove structure can also strengthen the pole plates, prevents pole plate fracture caused by longitudinal pressure on the cylindrical lithium ion battery, and helps to improve the safety performance of the battery.

Description

technical field [0001] The invention relates to batteries, in particular to a cylindrical lithium ion battery. Background technique [0002] In order to meet the demand for lithium-ion battery capacity in the ever-growing electric vehicle industry, the development of high-capacity ring-type lithium-ion batteries and cylindrical lithium-ion batteries has received great attention from the society. [0003] The electrical connection structure of the existing lithium-ion battery generally adopts the electrical connection structure of the current collector, the pole plate, the tab and the pole, and the current collector and the pole plate are usually sealed and connected by ultrasonic welding or laser welding. With the high capacity of the battery, the thickness of the current collector increases, and the difficulty of welding the electrode plate continues to increase, which is likely to cause problems of desoldering and virtual welding, resulting in damage to the rate performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M2/26H01M50/528H01M50/531
CPCY02E60/122H01M10/0525H01M10/0587H01M50/538Y02E60/10Y02P70/50
Inventor 徐德雷张伟英蔡惠群罗晓华魏银仓张兵彭心怡
Owner YINLONG ENERGY CO LTD
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