Electrochemical Energy Storage Devices

Abstract

The present invention discloses an electrochemical energy storage device, which comprises a positive electrode sheet, a negative electrode sheet, an isolation membrane, an electrolyte and a sealing member, wherein the positive electrode sheet comprises a current collector and a coating, the thickness of the one-side coating is h1, the insulation membrane is arranged between the positive electrode sheet and the negative electrode sheet and the thickness is h2, and the drawing wire length a1 of the positive electrode current collector during cutting overshoot is less than or equal to 1.2*(h1+h2). According to the present invention, when the electrochemical energy storage device using the current collector is abused (the foreign body pierces the electrical core), the positive electrode current collector drawing wire is short (no more than 1.2*(h1+h2)), no or less electronic channels exist between the positive electrode sheet and the negative electrode sheet, and the heat production is less, such that the electrical core has the high anti-piercing safety.

Description

Technical field [0001] The invention belongs to the field of electrochemical energy storage devices, and particularly relates to an electrochemical energy storage device and a preparation method thereof. Background technique [0002] In 1991, Japan’s Sony Corporation creatively adopted carbon materials as anode materials for lithium-ion batteries, which brought revolutionary changes to the field of lithium-ion batteries. Since then, lithium-ion battery technology has developed rapidly, in mobile phones, cameras, and notebook computers. And a large number of other portable appliances. Lithium-ion battery has many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, low self-discharge, long cycle life, etc. It is an ideal power supply for mobile electrical appliances and electric vehicles in the 21st century. Power supply and storage devices for power storage stations. However, the lithium batteries used in electric v...

AI Technical Summary

Problems solved by technology

However, the current polymer electrolytes often reduce the rate performance and low-temperature performance of the battery, which limits its application in power devices and energy storage devices used in low-temperature environments.

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