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Pole piece and secondary battery with same

A pole piece and tab technology, which is applied in secondary batteries, batteries, lithium batteries, etc., can solve the problems of increasing fire and increasing the short circuit of aluminum foil on the end face, so as to prevent internal short circuit and improve safety.

Active Publication Date: 2022-03-01
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the positive current collector, aluminum foil is covered with positive active material on its surface, but its end face is directly exposed to the electrolyte, which increases the probability of short circuit caused by the direct contact of the aluminum foil on the end face with the negative electrode, which in turn increases the probability of fire and other safety problems.

Method used

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  • Pole piece and secondary battery with same
  • Pole piece and secondary battery with same
  • Pole piece and secondary battery with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] One Preparation of positive electrode plate

[0110] In Example 1, the preparation method of the positive electrode plate includes the following steps (1) to (4).

[0111] Step (1): Preparation of Polymer Slurry

[0112]In the room temperature environment having a relative humidity of less than 2%, polyethylene (PE) particles and polyvinylidene fluoride (PVDF) were referred to in Table 1, and a certain N, N-dimethylformamide (NMP) was slowly added. The liquid is stirred at 25 ° C for 2 hours, and a uniform, stable slurry is formed. Among them, the particle size of the polyethylene particles is from 1 to 15 microns.

[0113] Step (2): Preparation of the positive pole pole zone and the third insulating portion 110

[0114] Lithium manganate positive electrode active materials, nickel-cobalt manganese (NCM) terms, conductive agent carbon black, binder polyvinylidene fluoride (PVDF), N-methylpyrrolidone (NMP) by weight of 67.34: 30 : 28.86: 2.7: 1.1 Stir mixing is uniform to gi...

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Abstract

The invention provides a pole piece and a secondary battery with the same. The pole piece comprises a current collector and an active substance layer, the current collector comprises a main body part and a tab, the active substance layer is coated on the surface of the main body part, and the tab extends from one end of the main body part along a first direction; a first insulating part is formed on the end face, provided with the tabs, of the main body part, and a second insulating part different from the first insulating part is formed on the end face, not provided with the tabs, of the main body part. The pole piece has good end face insulation protection, and the safety performance of the secondary battery can be improved.

Description

Technical field [0001] The present application relates to batteries, and more particularly, to a pole piece and which includes a secondary battery, and the battery module, a battery pack and electric device. Background technique [0002] With the development of electronic devices and intelligent people of secondary energy storage battery, especially the density of the lithium-ion battery with high energy demand more urgent. Lithium-ion battery, for example, gradually increase the energy density, often accompanied by increased security risks. An aluminum foil as a positive electrode current collector whose surface is covered with a positive electrode active material, but has an end face which is directly exposed to the electrolyte, increasing the direct contact with the negative end surface of the aluminum foil and the probability of causing a short circuit, which in turn increase the probability of fire and other safety problems . Inventive content [0003] The present applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M50/586H01M50/593H01M10/0525H01M10/052H01M10/054
CPCH01M4/13H01M4/139H01M50/586H01M50/593H01M10/0525H01M10/052H01M10/054H01M2220/20Y02E60/10H01M50/534
Inventor 唐怀超李婷彭龙庆牛少军金海族欧阳明高吴凯
Owner CONTEMPORARY AMPEREX TECH CO
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