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Soft-clad lithium ion battery for improving the impact performance of heavy objects and a preparation method thereof

A lithium-ion battery, impact performance technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of small improvement in the impact test of heavy objects, improve the impact pass rate of heavy objects, reduce the rupture range, avoid internal short circuit effect

Inactive Publication Date: 2019-01-22
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure only competes for cylindrical lithium-ion batteries, and the improvement in heavy impact tests for pouch batteries or batteries with higher capacity is small

Method used

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  • Soft-clad lithium ion battery for improving the impact performance of heavy objects and a preparation method thereof
  • Soft-clad lithium ion battery for improving the impact performance of heavy objects and a preparation method thereof
  • Soft-clad lithium ion battery for improving the impact performance of heavy objects and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A pouch lithium-ion battery that improves the impact performance of heavy objects, such as Figure 1-Figure 3 As shown, it includes a positive electrode sheet and a negative electrode sheet wound with each other. The positive electrode sheet is composed of a positive electrode current collector and a positive electrode active material layer coated on the surface of the current collector. The positive electrode current collector is a 10um aluminum foil. The positive electrode active The material layer includes a positive electrode active material, a conductive agent and a binder; the positive electrode active material includes LiCoO 3 ; The conductive agent is carbon nanotubes; The binder is polytetrafluoroethylene; The mass ratio of the positive electrode active material, conductive agent and binder is 95:0.1:1;

[0033] The negative electrode sheet is composed of a negative electrode current collector and a negative electrode active material layer coated on the current...

Embodiment 2

[0041] A soft pack lithium-ion battery that improves the impact performance of heavy objects, including a positive electrode sheet and a negative electrode sheet wound with each other, the positive electrode sheet is composed of a positive electrode current collector and a positive electrode active material layer coated on the surface of the current collector, the positive electrode The current collector is an aluminum foil of 20um, and the positive electrode active material layer includes a positive electrode active material, a conductive agent and a binder; the positive electrode active material includes LiCo x Ni y mn 1-x o 2 ; The conductive agent is a mixture of carbon nanotubes and acetylene black mass ratio of 1:2; the binder is styrene-butadiene; the mass ratio of the positive electrode active material, conductive agent and binder is 100:0.6: 1.2;

[0042] The negative electrode sheet is composed of a negative electrode current collector and a negative electrode act...

Embodiment 3

[0050] A soft pack lithium-ion battery that improves the impact performance of heavy objects, including a positive electrode sheet and a negative electrode sheet wound with each other, the positive electrode sheet is composed of a positive electrode current collector and a positive electrode active material layer coated on the surface of the current collector, the positive electrode The current collector is an aluminum foil of 15um, and the positive electrode active material layer includes a positive electrode active material, a conductive agent and a binder; the positive electrode active material includes LiFePO 4 The conductive agent is a mixture of carbon nanotubes and carbon black weight ratio of 2:1; the binder is polyvinylidene fluoride; the mass ratio of the positive electrode active material, conductive agent and binder is 98: 0.3:1.1;

[0051] The negative electrode sheet is composed of a negative electrode current collector and a negative electrode active material la...

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Abstract

The invention discloses a soft-clad lithium ion battery for improving the impact performance of heavy objects and a preparation method thereof, comprises a positive electrode sheet and a negative electrode sheet wound around each other, the positive electrode sheet is composed of a positive electrode current collector and a positive electrode active material layer coated on the current collector surface, the negative electrode sheet is composed of a negative electrode current collector and a negative electrode active material layer coated on the current collector, A spacer film is arranged between the positive electrode sheet and the negative electrode sheet, and the thickness of the spacer film is 8-12um. A hot melt adhesive film corresponding to the size of the electrode sheet is inserted between the positive electrode sheet and the negative electrode sheet of the intermediate layer and between the positive electrode sheet and the negative electrode sheet of the upper and lower outermost layers respectively. The positive and negative electrodes in contact with the hot melt adhesive are not coated with an active material layer. As that battery is impact by a heavy object, the heatsol can be heat-absorbed and melted, and the positive and negative electrode sheet and the diaphragm are bonded together, so that the battery core is not easy to be broken, and the impact pas rate ofthe heavy object is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a soft-pack lithium-ion battery with improved impact performance of heavy objects and a preparation method thereof. Background technique [0002] With the depletion of traditional energy sources and the increasing emphasis on environmental protection, lithium-ion batteries have developed rapidly due to their advantages such as high energy density and no environmental pollution. However, the safety of lithium-ion batteries has attracted more and more attention. [0003] Among them, the impact of heavy objects is one of the most important and difficult tests for batteries. The main reason is that the tensile strength of the diaphragm is small, and it is easy to crack after being hit by a heavy object, which leads to the contact between the positive and negative electrodes of the battery. [0004] In the Chinese patent with the publication number CN205609680, a batte...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 刘陈力为舒民
Owner 桑顿新能源科技(长沙)有限公司
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