Safe lithium ion cell

A lithium-ion and ion-electric technology, applied in the field of safe lithium-ion batteries, can solve problems such as limited protection, difficulty in guaranteeing the degree of mark making, and uneven quality of explosion-proof valves, so as to prevent fires and improve safety.

Active Publication Date: 2015-09-16
WEIFANG TIANZE NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps increase the strength of batteries that have tiny cracks near their outer edges during use without losing power. By treating these areas before they start burning out, it prevents them getting overheated while still being safe for users who want to charge them up later. Additionally, this treatment ensurizes good contact between different components within the battery's structure, reducing potential hazards such as short circuits.

Problems solved by technology

The technical problems addressed in this patent text are the continuous occurrence of accidents such as fires and explosions in lithium-ion batteries, specifically caused by short circuits. The current methods of protection, such as adding CID and PTC or installing explosion-proof valves, have limitations and do not guarantee safety. Additionally, the manufacturing process does not include measures to prevent short circuits, and the battery sealing environment is not conducive to improving safety performance.

Method used

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  • Safe lithium ion cell
  • Safe lithium ion cell
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Embodiment Construction

[0022] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0023] A safe lithium-ion cell, comprising a positive electrode sheet 2, a diaphragm 1, a negative electrode sheet 4, an electrolyte and a casing, the diaphragm includes a first diaphragm 1 and a second diaphragm 3, according to the first diaphragm 1, the positive electrode sheet 2, the second diaphragm 3 and the negative electrode sheet 4 are assembled into a winding core in sequence, the outer casing of the winding core is wrapped, the electrolyte is injected into the casing, and the tab is set on the positive electrode sheet. The tab set on the positive electrode sheet is aluminum tab 6, and the aluminum tab is micro When the current flowing through the aluminum tab

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Abstract

The present invention discloses a safe lithium ion cell, comprising a positive electrode sheet, a diaphragm, a negative electrode sheet, an electrolyte and a housing. The diaphragm comprises a first diaphragm and a second diaphragm; a winding core is assembled by using the first diaphragm, the positive electrode sheet, the second diaphragm and the negative electrode sheet in sequence; the winding core is enclosed in the housing; the electrolyte is injected into the housing; the positive electrode sheet is provided with a tab; the tab provided on the positive electrode sheet is an aluminum tab; the aluminum tab is slightly damaged, and the severity of the damage ensures that when the current flowing through the aluminum tab is more than twice the maximum discharge current of a lithium ion battery, the slightly damaged position of the aluminum tab fuses and breaks. A slightly damaged area is provided on the lithium ion battery tab, and therefore resistance in the slightly damaged area is increased. When an output current of the lithium battery is too large, the temperature of the slightly damaged area increases faster because the resistance of the tab in the slightly damaged area is larger, and the tab in the slightly damaged area fuses and breaks, thereby achieving the objective of improving battery safety.

Description

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Claims

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Application Information

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Owner WEIFANG TIANZE NEW ENERGY
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