High-safety cylindrical lithium ion battery

A lithium-ion battery and lithium-ion technology, applied in the field of lithium-ion batteries, can solve the problems of limited function of high-energy density lithium-ion batteries, and achieve the effects of unaffected electrical properties, preventing thermal runaway, and high acupuncture safety.

Pending Publication Date: 2021-04-02
XIAN SAFTY ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outer ring of the battery inner core is actually a positive and negative current collector, which constitutes a vest structure. When needling, a short circuit point is first formed on the outside of the battery core, leading the current to the outside of the battery core, consuming part of the power, and quickly dissipating heat. Going out, this structure can play a certain role in anti-acupuncture for batteries with a certain capacity and system, but it has a limited effect on high-energy-density lithium-ion batteries.

Method used

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  • High-safety cylindrical lithium ion battery
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  • High-safety cylindrical lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 and figure 2 As shown, the high-safety cylindrical lithium-ion battery of this embodiment includes an inner shell 2 and a cylindrical lithium-ion cell 4 filled in the inner shell 2, and the outer circumferential surface and the bottom surface of the inner shell 2 are coated with an outer shell 1, And the gap formed between the inner shell 2 and the outer shell 1 is filled with a gel state flame retardant 3, a cap 5 is installed on the top surface of the inner shell 2, and the cylindrical lithium ion cell 4 is composed of a positive pole piece 4 -1. The diaphragm 4-3 and the negative pole piece 4-2 are stacked in sequence and then wound, and the cylindrical lithium-ion battery cell 4 is filled with electrolyte solution.

[0036] The composition of the gel state flame retardant 3 in the present embodiment is a chlorine flame retardant, a bromine flame retardant or a composite flame retardant, and the composite flame retardant contains phosphorus, boron ...

Embodiment 2

[0047] The manufacturing process of the high-safety cylindrical lithium-ion battery of the present embodiment includes the following steps:

[0048]Step 1, preparing a cylindrical lithium-ion cell;

[0049] Step 101, preparing the positive pole piece

[0050] Step 1011, preparation of positive electrode slurry: adding active material, conductive agent and binder to the solvent and stirring evenly with a mixer to obtain positive electrode slurry; the active material is lithium cobaltate, and the conductive agent is conductive carbon black and carbon A composite conductive agent composed of nanotubes, the binder is polyvinylidene fluoride, the solvent is N-methylpyrrolidone, and the mass ratio of active material, conductive agent, binder and solvent is 96.5:1.8:1.7:60;

[0051] Step 1012, positive electrode coating: the positive electrode slurry obtained in step 1011 is evenly coated on both sides of the positive electrode current collector aluminum foil by means of intermitten...

Embodiment 3

[0077] The manufacturing process of the high-safety cylindrical lithium-ion battery of the present embodiment includes the following steps:

[0078] Step 1, preparing a cylindrical lithium-ion cell;

[0079] Step 101, preparing the positive pole piece

[0080] Step 1011, positive electrode slurry preparation: add active material, conductive agent and binder to the solvent and use a mixer to stir evenly to obtain positive electrode slurry; the active material is nickel cobalt lithium manganese oxide material (NCM811), conductive agent It is a composite conductive agent composed of conductive carbon black and carbon nanotubes, the binder is polyvinylidene fluoride, and the solvent is N-methylpyrrolidone, and the mass ratio of active material, conductive agent, binder and solvent is 96.7: 1.8:1.5:80;

[0081] Step 1012, positive electrode coating: the positive electrode slurry obtained in step 1011 is evenly coated on both sides of the positive electrode current collector alumi...

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Abstract

The invention discloses a high-safety cylindrical lithium ion battery which comprises an inner shell and a cylindrical lithium ion battery cell filled in the inner shell, the outer circumferential surface and the bottom surface of the inner shell are coated with an outer shell, a gap formed between the inner shell and the outer shell is filled with a gel-state flame retardant, and a cover cap is mounted on the top surface of the inner shell. The cylindrical lithium ion battery cell is formed by sequentially stacking and winding a positive pole piece, a diaphragm and a negative pole piece, andthe cylindrical lithium ion battery cell is filled with electrolyte. The cylindrical lithium ion battery cell adopts a double-shell structure design, and the gap formed between the inner shell and theouter shell is filled with the gel-state flame retardant, so that the gel-state flame retardant is molten in the needling process and enters the cylindrical lithium ion battery cell, thermal runawayis prevented, and the needling safety of the cylindrical lithium ion battery is guaranteed. And meanwhile, the high-safety cylindrical lithium ion battery has good electrical performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a high-safety cylindrical lithium ion battery. Background technique [0002] Cylindrical lithium-ion batteries are widely used in notebook computers, digital cameras, lighting fixtures, toys, electric tools, portable power banks, electric vehicles and other fields. Therefore, their safety performance is always a concern of users. [0003] Among the various abuse conditions for evaluating the safety performance of lithium-ion batteries, acupuncture is one of the most severe abuse conditions, and it is also one of the common failure modes in lithium-ion battery safety tests. Taking the conventional 18650 cylindrical lithium-ion battery as an example, it is usually difficult to pass the acupuncture test required by the national standard due to the small size of the battery, the hard steel case, the high energy density, and the explosive power. [0004] The acupuncture safety of...

Claims

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Application Information

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IPC IPC(8): H01M50/107H01M50/124H01M50/143
CPCY02E60/10
Inventor 李君侠王宏宇杨洪党建库何显峰曹杉杉李楠
Owner XIAN SAFTY ENERGY TECH
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