Puncture-test flame-retardant battery

Abstract

The invention relates to a battery, and in particular to a puncture-test flame-retardant battery. The puncture-test flame-retardant battery comprises a naked battery core and an outer-layer copper foil, wherein a metal protection layer is arranged between the naked battery core and the outer-layer copper foil, an accommodating cavity is arranged between the metal protection layer and the outer-layer copper foil, a partition bar is arranged in the accommodating cavity and is an insulation body, the inner surface of the outer-layer copper foil is provided with an insulation film, one side of the partition bar is in contact with the insulation film, the other side of the partition bar is in contact with the outer surface of the metal protection layer, one-way valves are arranged on the metal protection layer, the accommodating cavity is communicated with the naked battery core by the one-way valves, the direction of the one-way valve faces the accommodating cavity from the naked battery core, and the interior of the accommodating cavity is filled with a flame-retardant substance and a low-pressure gas with atmospheric pressure lower than one standard atmospheric pressure. The puncture-test flame-retardant battery has the advantages that the external structure of the battery can be improved, the battery deformation is avoided, a combustion-supporting gas is prevented from entering when the battery is punctured, the current increase is relieved, the heat in the battery is reduced, and the battery burning and explosion are prevented.

Description

technical field [0001] The invention relates to a battery, in particular to a fireproof battery for acupuncture tests. Background technique [0002] The existing battery is that the outer layer of the bare cell is coated with a layer of copper foil, and the bare cell is formed by winding an anode, a separator, and a cathode, and there is an electrolyte in the bare cell. When this type of battery is under pressure, the outer copper foil is easily deformed, and the battery is easy to leak, causing the battery to be scrapped, and even causing the battery to spontaneously ignite and explode. When testing the safety index of a battery, an acupuncture machine is usually used to do an acupuncture test, and a metal needle is used to penetrate the battery to test whether the battery spontaneously ignites or explodes. When the metal needle passes through the battery, the metal needle contacts the copper foil and the bare cell, causing a short circuit, generating a large current, and ...

AI Technical Summary

Problems solved by technology

When the metal needle passes through the battery, the metal needle contacts the copper foil and the bare cell, causing a short circuit, generating a large current, and the temperature of the metal needle rises. However, the structure of the existing battery prevents the heat from being released, and the outside air passes through the metal needle. Into the battery, the oxygen in the air acts as a combustion-supporting gas, causing the battery to spontaneously ignite or even explode

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