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Cylindrical lithium-ion battery

A lithium-ion battery, cylindrical technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of insufficient shock resistance, large internal resistance of the battery, poor consistency, etc., to improve the vibration resistance and reduce the internal resistance, the effect of enhancing the rate performance

Active Publication Date: 2020-07-28
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cylindrical lithium-ion battery, aiming to solve the problems of the existing cylindrical lithium-ion battery formed by winding insulating tape, the internal resistance of the battery is large, the consistency is poor, and the shock resistance is insufficient.

Method used

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Examples

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Effect test

Embodiment 1

[0035] A cylindrical lithium-ion battery, comprising a steel case and a winding core sheathed in the steel case, the winding core is formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm, and the outermost layer of the winding core is Negative electrode sheet copper foil, filled with conductive swelling glue between the winding core and the steel shell, the negative electrode sheet copper foil is electrically connected to the steel shell through the conductive swelling glue, and the conductive swelling glue It consists of a substrate layer and an adhesive layer attached to the substrate layer, the adhesive layer is composed of a swelling component and a conductive component, and the adhesive layer is bonded to the negative electrode sheet copper foil ;

[0036] Wherein, the base material layer is 8 μm copper foil, the bonding layer is composed of urethane acrylate, epoxy resin, and graphite powder, and the mass ratio of urethane acrylate: epo...

Embodiment 2

[0040] A cylindrical lithium-ion battery, comprising a steel case and a winding core sheathed in the steel case, the winding core is formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm, and the outermost layer of the winding core is Negative electrode sheet copper foil, filled with conductive swelling glue between the winding core and the steel shell, the negative electrode sheet copper foil is electrically connected to the steel shell through the conductive swelling glue, and the conductive swelling glue It consists of a substrate layer and an adhesive layer attached to the substrate layer, the adhesive layer is composed of a swelling component and a conductive component, and the adhesive layer is bonded to the negative electrode sheet copper foil ;

[0041] Wherein, the substrate layer is 16 μm aluminum foil, the bonding layer is composed of epoxy acrylate, phenolic resin, and copper powder, and the mass ratio of epoxy acrylate:phenolic r...

Embodiment 3

[0044] A cylindrical lithium-ion battery, comprising a steel case and a winding core sheathed in the steel case, the winding core is formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm, and the outermost layer of the winding core is Negative electrode sheet copper foil, filled with conductive swelling glue between the winding core and the steel shell, the negative electrode sheet copper foil is electrically connected to the steel shell through the conductive swelling glue, and the conductive swelling glue It consists of a substrate layer and an adhesive layer attached to the substrate layer, the adhesive layer is composed of a swelling component and a conductive component, and the adhesive layer is bonded to the negative electrode sheet copper foil ;

[0045] Wherein, the substrate layer is 12 μm copper foil, the bonding layer is composed of epoxy acrylate, polyester acrylate, phenolic resin, graphite, and epoxy acrylate: polyester acrylate...

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Abstract

The invention provides a cylindrical lithium-ion battery, comprising a steel case and a winding core sheathed in the steel case, the winding core is formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm, and the winding core The outermost layer is a negative electrode copper foil, and a conductive swelling glue is filled between the winding core and the steel shell, and the negative electrode copper foil is electrically connected to the steel shell through the conductive swelling glue, wherein , the volume expansion rate of the conductive swelling glue soaked in the electrolyte solution at 25°C for 24 hours is ≥100%, and the conductivity of the conductive swelling glue is ≥10 4 S / m.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a cylindrical lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, light weight, high energy density, long service life, low self-discharge and no memory effect during use, and have been widely used in energy storage, electric power and other aspects. At present, cylindrical lithium-ion batteries are prepared by winding the fabricated positive and negative electrodes and separators into the casing. Usually, in order to prevent the winding core from being loose and affect the performance of the battery (but it cannot guarantee that the winding core will not be loose), the cylindrical lithium-ion battery uses insulating tape to wrap the surface of the outer separator after the positive electrode sheet, separator, and negative electrode sheet are wound to form a roll. core. In the cylindrical lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 安永杨俊赵悠曼乔亚非
Owner DONGGUAN CHUANGMING BATTERY TECH
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