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Button cell

A button battery and electrode sheet technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of lithium dendrites easily formed on the negative electrode sheet, battery short circuit, etc.

Active Publication Date: 2021-07-20
重庆冠宇电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the embodiments of the present invention is to provide a button battery, which aims to solve the technical problem that lithium dendrites are easily formed on the surface of the negative electrode sheet, thereby causing a short circuit of the battery

Method used

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Examples

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Embodiment 1

[0039] In conjunction with Table 1, it can be seen that the porosity of the negative electrode active material layer in Example 1 is 52.73%; the thickness of the negative electrode sheet configuring the negative electrode active material layer of Example 1 is 0.223mm; The pore volume of the material layer is 0.000033cm 3 / g; the aperture in embodiment 1 is that the pore volume value of the negative electrode active material layer of 15.4nm is 0.000270cm 3 / g.

[0040] The negative electrode active material layer involved in Example 1 was subjected to a 60 bar rolling test, and the ratio of the porosity of the negative active material layer after rolling to the porosity of the negative active material layer before rolling was 69.3%.

[0041] Carry out 60bar rolling test to the negative electrode active material layer that embodiment 1 relates to, the pore volume value of the negative electrode active material layer that the hole diameter after rolling is 1.7nm is the pore volu...

Embodiment 2

[0044] In conjunction with Table 1, it can be seen that the porosity of the negative electrode active material layer in Example 2 is 54.89%; the thickness of the negative electrode sheet configuring the negative electrode active material layer of Example 2 is 0.203mm; The pore volume of the material layer is 0.000029cm 3 / g; the aperture in embodiment 2 is that the pore volume value of the negative electrode active material layer of 15.4nm is 0.000237cm 3 / g.

[0045] The negative electrode active material layer involved in Example 2 was subjected to a 60bar rolling test, and the ratio of the porosity of the negative active material layer after rolling to the porosity of the negative active material layer before rolling was 70.61%.

[0046] Carry out 60bar rolling test to the negative electrode active material layer that embodiment 2 involves, the pore volume value of the negative electrode active material layer that the hole diameter after rolling is 1.7nm is the pore volume o...

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Abstract

The invention provides a button cell which comprises an electrode shell, electrode plates, electrolyte and a diaphragm, the electrode shell comprises a positive electrode shell and a negative electrode shell, and the electrode plates comprise a positive plate and a negative plate. The negative plate comprises a current collector and a negative active material layer on the current collector, the porosity of the negative active material layer is greater than 50%, the negative active material layer is subjected to a 60bar rolling test, and the ratio of the porosity of the rolled negative active material layer to the porosity of the negative active material layer before rolling is less than or equal to 72%. According to the lithium ion battery, based on the characteristics of the negative electrode active material layer, a large number of lithium ions can be prevented from being deintercalated from the negative electrode plate, so that the short circuit of the battery caused by lithium dendrites formed on the surface of the negative electrode plate by the large number of deintercalated lithium ions is avoided.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a button battery. Background technique [0002] Button batteries are widely used in various miniature products, such as computer motherboards, watches, calculators, Bluetooth headsets, and walkie-talkies, due to their lightness and compactness. The negative electrode sheet of the existing button battery is a lithium sheet. There may be such a situation. During the charging and discharging process of the battery, lithium ions are deintercalated from the negative electrode sheet, and a large amount of lithium ions are in a dendrite state, forming lithium dendrites. Accumulated on the surface of the negative electrode sheet, lithium dendrites pierce the separator, causing a short circuit in the battery. Contents of the invention [0003] The main purpose of the embodiments of the present invention is to provide a button battery, which aims to solve the technical problem that li...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M10/058H01M10/0525H01M10/42
CPCH01M4/133H01M10/058H01M10/0525H01M10/4235Y02P70/50
Inventor 宋杰芳
Owner 重庆冠宇电池有限公司
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