A high-power cylindrical lithium-ion battery cell

A cylindrical, lithium-ion technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of high power and low self-consumption, battery charging lithium, and battery internal resistance, etc., to reduce the edge The risk of broken tape, the effect of reducing impedance and improving the productivity of good products

Inactive Publication Date: 2021-01-15
DONGGUAN MCNAIR NEW POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in commercial cylindrical batteries, the positive tab is generally drawn from the top cover, and the negative tab is connected to the steel shell through welding at the bottom. The bottleneck of this design is that the positive and negative electrodes can only be drawn out through one tab. Leading out the negative electrode with multiple tabs will inevitably lead to positive active materials appearing in the corresponding position of the negative tab, which will lead to the lithium deposition of the battery and cause safety accidents
In commercial applications, it is obviously a big investment in terms of cost and technical requirements if the lead-out structure or other equipment is changed to achieve multi-pole alignment.
In addition, compared with commercial cylindrical batteries such as 18650 and 26650, the diameter of 32650 cylindrical batteries is larger, and the length of the pole piece is also longer. If the single-pole lug is used in the industry, the internal resistance of the battery must be large. It is difficult to meet the requirements of high power and low self-consumption in power battery applications

Method used

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  • A high-power cylindrical lithium-ion battery cell
  • A high-power cylindrical lithium-ion battery cell

Examples

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Embodiment 1

[0021] This embodiment is a high-power cylindrical lithium-ion cell, which is formed by stacking a positive electrode sheet 3, a separator 1 and a negative electrode sheet 2 sequentially and then winding them in the same direction. The negative electrode sheet 2 includes a negative electrode current collector 21 and is coated on The negative electrode active material layer 22 on both sides of the negative electrode current collector 21, the two sides of the negative electrode current collector 21 are respectively reserved with three negative electrode gaps 23 that are not coated with the negative electrode active material layer 22, and the three negative electrode gaps 23 are respectively arranged on the negative electrode sheet 2, and the widths of the three negative gaps 23 are kept equal; the three negative gaps 23 are respectively welded with negative tabs 24, and the three negative tabs 24 are welded on the same side of the negative sheet 2, The negative electrode gap 23 i...

Embodiment 2

[0024] This embodiment is a high-power cylindrical lithium-ion cell, which is formed by stacking a positive electrode sheet 3, a separator 1 and a negative electrode sheet 2 sequentially and then winding them in the same direction. The negative electrode sheet 2 includes a negative electrode current collector 21 and is coated on The negative electrode active material layer 22 on both sides of the negative electrode current collector 21, the two sides of the negative electrode current collector 21 are respectively reserved with four negative electrode gaps 23 that are not coated with the negative electrode active material layer 22, and the four negative electrode gaps 23 are respectively arranged on the negative electrode. The head, middle and tail of the sheet 2, and the widths of the four negative gaps 23 are kept equal; the four negative gaps 23 are respectively welded with negative tabs 24, and the four negative tabs 24 are welded on the same side of the negative sheet 2 , t...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-power cylindrical lithium-ion cell, which has a plurality of negative electrode gaps not coated with a negative electrode active material layer respectively reserved on both sides of the negative electrode current collector. Negative electrode lugs are welded at the negative electrode gap, and the negative electrode gap is also covered with negative electrode insulating glue and covers the negative electrode ear. A plurality of uncoated positive electrode active material layers are respectively reserved on the positive electrode gaps that correspond to the negative electrode gaps one by one. Insulating glue, the two ends of the positive electrode insulating glue respectively expose the edge of the positive electrode sheet by 1-10 mm in the width direction of the positive electrode sheet. The invention can not only ensure the power requirement of the battery, avoid lithium deposition at the tab position of the battery, but also accurately judge the position alignment of the gap between the positive electrode sheet and the negative electrode sheet.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a high-power cylindrical lithium ion battery cell. Background technique [0002] Due to its outstanding advantages such as high energy density, low self-discharge, and no memory effect, lithium-ion batteries have become the main solution for mobile energy, and are widely used in portable electronic products, electric vehicles, and energy storage power stations. [0003] Among them, the cylindrical battery is generally composed of a steel case, a top cover, a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. At present, in commercial cylindrical batteries, the positive tab is generally drawn from the top cover, and the negative tab is connected to the steel shell through welding at the bottom. The bottleneck of this design is that the positive and negative electrodes can only be drawn out through one tab. The lead out of the nega...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/538H01M50/595H01M10/04H01M10/0525H01M10/0587H01M50/572
CPCH01M10/0431H01M10/0525H01M10/0587H01M50/538H01M50/572Y02E60/10Y02P70/50
Inventor 余伟源刘勇于丰王娜宋晓娜朱坤庆
Owner DONGGUAN MCNAIR NEW POWER
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