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Cylindrical lithium-ion battery

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

Active Publication Date: 2018-02-23
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. The cylindrical lithium-ion battery comprises a steel shell and a winding core sheathed in the steel shell, wherein the winding core is formedby winding a positive piece, a negative piece and a diaphragm; the outermost layer of the winding core is a negative-piece copper foil; conductive swelling adhesive is filled between the winding coreand the steel shell; the negative-piece copper foil is electrically connected with the steel shell by the conductive swelling adhesive; and the volume expansion ratio of the conductive swelling adhesive soaked in electrolyte with the temperature of 25 DEG C for 24 hours is more than or equal to 100%, and the conductivity of the conductive swelling adhesive is more than or equal to 104S / 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 Applications(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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