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Electrochemical device and electric equipment

An electrochemical and electrode assembly technology, which is applied in the field of electrochemical devices and electrical equipment, can solve problems such as inversion of the diaphragm, short circuit of local positive and negative electrodes, potential safety hazards, etc., to reduce shrinkage, reduce the risk of short circuit, Guaranteed long-term safety effect

Pending Publication Date: 2022-07-08
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diaphragm will shrink at high temperature (>110°C), which will lead to a short circuit caused by direct contact between the positive and negative pole pieces, resulting in a safety hazard; secondly, the impact of the electrolyte may cause the diaphragm at the edge to turn inward when it is dropped. As a result, it will also lead to direct contact of local positive and negative pole pieces and cause a short circuit, resulting in potential safety hazards

Method used

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  • Electrochemical device and electric equipment
  • Electrochemical device and electric equipment
  • Electrochemical device and electric equipment

Examples

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preparation example Construction

[0068] The embodiments of the present application further provide a method for preparing an isolation layer, for preparing at least one of the first isolation layer 13 , the second isolation layer 14 and the third isolation layer 16 . The following takes the material of the isolation layer including polymer fibers as an example, combined with Image 6 As shown, the method of making the isolation layer is described.

[0069] S11: using a spinning process to spray a solution containing at least a polymer on at least one surface of the positive electrode piece or the negative electrode piece, and drying to form a separation layer.

[0070] S12: Adhere the isolation layers on both sides of the pole piece.

[0071] S13: Assemble the positive electrode and the negative electrode into an electrochemical device after predetermined treatment.

[0072] The preparation process and materials of the positive electrode and the negative electrode are not limited by the embodiments of the p...

Embodiment 1

[0099] (1) Preparation of negative pole piece: the negative active material graphite, conductive carbon black (Super P), and styrene-butadiene rubber (SBR) are mixed according to a weight ratio of 96:1.5:2.5, and deionized water is added to prepare a solid content of 0.7 of the slurry, and stir it evenly, then the slurry is evenly coated on one surface of the negative electrode current collector copper foil, and dried at 110 ° C to obtain a negative electrode active material layer, and then the same process is used in the negative electrode current collector. Another negative electrode active material layer is formed on the other surface. Further, through cutting pieces and welding tabs, a negative pole piece is obtained.

[0100] (2) Preparation of positive electrode sheet: The positive electrode active material lithium cobalt oxide (LiCoO 2 ), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 97.5:1.0:1.5, and N-methylpyrr...

Embodiment 2

[0105] The difference between Embodiment 2 and Embodiment 1 is that L1 / L2=50% is controlled.

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Abstract

The invention discloses an electrochemical device and electric equipment. The electrochemical device comprises an electrode assembly, the electrode assembly comprises a first pole piece, a first isolation layer, a second pole piece and a second isolation layer, the first isolation layer is located between the first pole piece and the second pole piece, and the second pole piece is located between the first isolation layer and the second isolation layer; in the first direction, the first isolation layer comprises a first extension part exceeding the second pole piece, and the second isolation layer comprises a second extension part exceeding the second pole piece; the first extending part comprises a first bonding area, the second extending part comprises a second bonding area, the bonding force between the first bonding area and the second bonding area is F1, and F1 is larger than or equal to 5N / m. According to the electrochemical device, the isolating layers on the two sides of the pole pieces are bonded, the isolating layers are prevented from shrinking at high temperature, or the isolating layers are prevented from turning inwards at the edge due to impact of electrolyte during falling, and isolation between the positive pole piece and the negative pole piece is ensured to prevent short circuit.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to an electrochemical device and electrical equipment. Background technique [0002] Electrochemical devices (eg, lithium-ion batteries) have the advantages of high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, and long cycle life, and have been widely used in many fields. With the wide application of electrochemical devices, their performance has also received more and more attention. [0003] In the current electrochemical device, the separator is arranged between the positive pole piece and the negative pole piece. One of its main functions is to isolate the positive pole piece and the negative pole piece, so that the electrons cannot pass freely, and the electrolyte is allowed to pass through. ions pass freely. However, the diaphragm will shrink at high temperature (>110°C), resulting in the direc...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M10/058H01M10/0525
CPCH01M50/40H01M10/058H01M10/0525H01M10/04Y02E60/10Y02P70/50H01M10/0431H01M10/0587H01M10/0463H01M10/0585H01M4/13H01M50/531H01M50/538H01M50/446
Inventor 翁秋燕张益博魏红梅
Owner NINGDE AMPEREX TECH
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