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High-safety polymer flexible package lithium ion battery

A lithium-ion battery, high-safety technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as thermal runaway, explosion, product damage to personal safety, etc., to reduce battery performance, reliable reaction mechanism, Avoid the effects of thermal runaway

Active Publication Date: 2022-02-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, with the expansion of the application scale of lithium-ion batteries in various industries, many problems have arisen, among which the most serious is the safety accident of lithium-ion batteries.
Due to its higher and higher energy density, when the battery is abnormal, it is easy to cause thermal runaway, resulting in serious fire and explosion, resulting in product damage and even personal safety.
[0003] Under normal circumstances, various external protection designs for lithium-ion batteries, including external design schemes such as protection circuits and shell protection, can realize the protection of lithium-ion batteries from external factors, and prevent lithium-ion batteries from being impacted by external forces, extrusion, deformation, etc. Mechanical damage, overcharge, over discharge, external short circuit, overload, overheating and other abuse conditions have a significant effect on electrical / thermal damage, but these methods are often powerless against thermal runaway caused by short circuits inside the battery, so the The Intrinsic Safety of Li-ion Batteries Is Imminent

Method used

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  • High-safety polymer flexible package lithium ion battery
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  • High-safety polymer flexible package lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of shape memory alloy current collector: select a TiNi shape memory alloy with a thickness of 0.1mm and a phase transition temperature of 80°C; pre-deform the TiNi alloy sheet into a wavy cross-section using a special mold, such as image 3 . Then keep the shape and put it in a 450°C environment for 4 hours, and then cool it naturally. The cooled TiNi shape memory alloy is flattened again to become figure 2 the shape shown.

[0028] Negative electrode preparation: mix graphite, conductive carbon black, polymethylcellulose sodium, styrene-butadiene rubber emulsion with deionized water in a ratio of 94:1:1.5:2.5 to form a slurry, and then mix it in the prepared shape memory The surface of the alloy current collector is coated with an appropriate amount of negative electrode slurry, and then vacuum-dried at 60°C.

[0029] Manufacture of soft-pack batteries: Assemble the negative and positive electrodes prepared by the above method, separator, electrolyte, a...

Embodiment 2

[0032] Preparation of the shape memory alloy current collector: select a TiNi shape memory alloy with a thickness of 0.15 mm and a phase transition temperature of 105° C.; pre-deform the TiNi alloy sheet into a concave-convex texture with a special clamp. Then keep the shape and put it in a 600°C environment for 4 hours, and then cool it naturally. The cooled TiNi shape memory alloy is flat-pressed into figure 2 Planar form shown.

[0033] Such as figure 1 , the prepared shape memory alloy current collector is coated with negative electrode slurry, and then assembled with positive electrode, separator, electrolyte, and aluminum-plastic composite film to form a flexible lithium-ion battery 1 .

[0034] For the soft-packaged lithium-ion battery in this embodiment, when the internal temperature reaches 105°C during the abuse test, the negative electrode shape memory alloy current collector will deform and return to the shape of the high-temperature state of the shape memory al...

Embodiment 3

[0036] Preparation of shape memory alloy current collector: select a TiNi shape memory alloy foil coil with a thickness of 0.008mm and a phase transition temperature of 85°C; emboss the TiNi shape memory alloy foil coil using a roller press mold, and its surface appearance Such as Figure 6 . Heating at the same time during the embossing process keeps the rolling embossing die at 200°C, and the rolling speed is kept at a relatively slow level to ensure that the TiNi shape memory alloy foil coil can remain deformed for more than 30 minutes during the embossing process. After the high temperature zone, after the coil material drops to normal temperature, it will be flattened into a coil material after being rolled with a smooth surface.

[0037] The prepared shape memory alloy current collector coil is coated with negative electrode slurry using large-scale production coating equipment, and dried at a temperature below 80°C to obtain a negative electrode sheet, and then combine...

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Abstract

The invention discloses a high-safety polymer flexible package lithium ion battery. The battery comprises a positive electrode, a negative electrode, a diaphragm, electrolyte and an aluminum-plastic composite film. In the manufacturing step of the negative electrode, a shape memory alloy is adopted as a current collector, the surface of the current collector is coated with a negative electrode active material, and thus the negative electrode of the flexible package lithium ion battery is manufactured; then thenegative electrodeis assembled with the positive electrode of the lithium ion battery, the diaphragm, the electrolyte and the aluminum-plastic composite film to form the flexible package lithium ion battery; when internal short circuit, external short circuit, overcharge, overdischarge and other abnormalities occur in the use process of the battery, the internal temperature of the battery rises; and when the temperature reaches the phase change temperature of the shape memory alloy current collector, the shape memory alloy current collector deforms to form a large number of gaps between the positive electrode and the negative electrode of the internal lithium ion battery, ion and electron conductive channels between the positive electrode and the negative electrode are destroyed, and the internal resistance of the battery is sharply increased, so that the internal electrochemical process is blocked, and thermal runaway of the battery is avoided.

Description

technical field [0001] The invention belongs to the technical field of manufacturing lithium-ion batteries, in particular to a high-safety polymer soft-packaged lithium-ion battery with a self-blocking mechanism and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries are widely used in automobiles, 3C, bicycles and other product fields due to their high energy density, environmental protection and other advantages. However, in recent years, with the expansion of the application scale of lithium-ion batteries in various industries, many problems have occurred, among which the most serious is the safety accident of lithium-ion batteries. Due to its higher and higher energy density, when the battery is abnormal, it is easy to cause thermal runaway, resulting in serious fire and explosion, resulting in product damage and even personal safety. [0003] Under normal circumstances, various external protection designs for lithium-ion batteries, inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/66H01M10/058H01M10/42
CPCH01M10/0525H01M4/662H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 李峰赵铭姝郑青阳赵晓波王宇杨森
Owner XI AN JIAOTONG UNIV
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