A kind of lithium ion battery and manufacturing method thereof

A lithium-ion battery, battery cathode technology, applied in circuits, electrical components, electrochemical generators, etc., can solve problems such as low rate performance and poor safety performance, improve safety performance, avoid short-circuit, and increase charge-discharge rate. performance effect

Active Publication Date: 2019-06-14
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium ion battery with high safety performance and high rate performance for the existing lithium ion battery with poor safety performance and low rate performance

Method used

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  • A kind of lithium ion battery and manufacturing method thereof
  • A kind of lithium ion battery and manufacturing method thereof
  • A kind of lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of battery positive electrode sheet: Mix nickel-cobalt lithium manganese oxide, conductive carbon, and polyvinylidene fluoride in N-methylpyrrolidone solvent at a mass ratio of 96:2:2 to make positive electrode slurry, and then coat it on aluminum foil After being dried, it is cold-pressed and slitting to make the positive electrode sheet of the battery.

[0035] Preparation of battery negative electrode sheet: Mix graphite, conductive carbon, sodium carboxymethyl cellulose, and styrene-butadiene rubber in deionized water at a mass ratio of 96:1.5:1.5:1 to make negative electrode slurry, and then coat it on copper foil After drying, cold pressing and slitting are carried out to make battery negative plates.

[0036] Preparation of isolation membrane: the isolation membrane is a 12 μm polyethylene / polypropylene composite microporous film.

[0037] Electrolyte preparation: Lithium hexafluorophosphate was dissolved in a mixed solvent composed of ethylene carbo...

Embodiment 2

[0040] The difference from Example 1 is that the production of lithium-ion batteries: Step 1: select a metal aluminum sheet of 5 mm, and lead out the positive electrode conductive terminal by welding or cutting; select a metal copper sheet of 5 mm, and lead out the negative electrode by welding or cutting Conductive terminal; Step 2: Coating polyethylene PE material on the outer surface of the metal aluminum sheet and the metal copper sheet respectively to form the positive electrode sheet and the negative electrode sheet of the capacitor, and ensure that the surface after the coating treatment is smooth and smooth, so as to increase the flatness of the battery ; Step 3: After laminating the above-mentioned battery positive electrode sheet, separator, and battery negative electrode sheet sequentially, the battery cell is made by stacking sheets, and the outermost layer of the battery cell is respectively left with a battery positive electrode sheet and a battery negative electro...

Embodiment 3

[0043] The difference from Example 1 is that the production of lithium-ion batteries: Step 1: Select a 20mm metal aluminum sheet, and lead out the positive electrode conductive terminal by welding or cutting; choose a 20mm metal copper sheet, and lead out the negative electrode by welding or cutting Conductive terminal; Step 2: Cover the outer surface of the metal aluminum sheet and the metal copper sheet with polyvinyl chloride PVC material to form the positive electrode sheet of the capacitor and the negative electrode sheet of the capacitor, and ensure that the surface after the coating treatment is smooth and smooth, so as to increase the flatness of the battery Step 3: After laminating the above-mentioned battery positive electrode sheet, separator, and battery negative electrode sheet sequentially, the battery cell is made by stacking sheets, and the outermost layer of the battery cell is respectively left with a battery positive electrode sheet and a battery negative elec...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a lithium ion battery and a making method thereof. The lithium ion battery comprises a battery cell, an electrolyte and a packaging shell containing the battery cell and the electrolyte. The battery cell comprises a battery positive plate, a battery negative plate and an isolation film arranged between the battery positive plate and the battery negative plate in a separation mode. A capacitor connected with the battery cell in parallel is further included in the packaging shell and comprises a capacitor positive plate and a capacitor negative plate, the capacitor positive plate is arranged on the outer surface of the battery cell and corresponds to the battery negative plate, and the capacitor negative plate is arranged on the outer surface of the battery cell and corresponds to the battery positive plate. When external puncturing or squeezing occurs, a short-circuiting loop is formed by the capacitor positive plate and the battery negative plate, a short-circuiting loop is formed by the capacitor negative plate and the battery positive plate, the charged battery is quickly discharged, the risk of fire catching or explosion of the battery is reduced, and the safety performance of the battery is improved. Besides, the capacitor can bear large-current charging and discharging, and thus the charging and discharging rate capability of the battery can be improved when the capacitor is connected with the battery cell in parallel.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery and a manufacturing method thereof. Background technique [0002] With the advantages of high energy density, high working voltage, and long cycle life, lithium-ion batteries have become the mainstream secondary batteries in the market. Lithium-ion batteries are basically used as power sources in smartphones, tablet computers, smart wearable devices and other products. . However, lithium-ion batteries have always hidden safety problems, and this problem is also the focus of attention of professionals in the industry. Although lithium-ion batteries have greatly improved safety performance compared with metal lithium secondary batteries, in practice There are still many hidden dangers in the application. Therefore, the safety issue is the main problem restricting the large-scale commercialization of high-capacity and power lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M16/00
CPCH01M16/00
Inventor 刘凯
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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