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Pole piece and laminated electrical core body for lithium ion battery

A lithium-ion battery and pole piece technology, applied in battery electrodes, battery pack parts, non-aqueous electrolyte batteries, etc., can solve problems such as short circuit and arc pole piece contact

Inactive Publication Date: 2013-12-25
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, if the battery stacks are not neat, or the pole piece is loose, the arc surface formed by the welding part of the tab or the bending of the tab is easy to contact with the pole piece, and a short circuit occurs

Method used

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  • Pole piece and laminated electrical core body for lithium ion battery
  • Pole piece and laminated electrical core body for lithium ion battery
  • Pole piece and laminated electrical core body for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] see figure 1 , 2 As shown, a pole piece for a lithium ion battery provided in this embodiment mainly includes: a metal current collector 101, an active material layer 102 is coated on the surface of the metal current collector 101, and the metal current collector 101 also extends There is a tab welding part 103, and the active material layer 102 is not coated on the tab welding part 103 so that the metal substrate is exposed. In this embodiment, the end part extending from the tab welding part 103 is the first pole. end 201, the cross-section of the first end 201 of the metal current collector 101 ( figure 2 The area marked with a slash) is coated with an insulating silicone layer.

[0032] It can be seen from the above that by applying the technical solution of this embodiment, since the cross-section of the end 201 extending from the tab welding portion 103 on the pole piece is also coated with an insulating silica gel layer, the tab of the above structure is used ...

Embodiment 2

[0037] see image 3 As shown, this embodiment provides a laminated lithium-ion battery core body, which mainly includes positive plates stacked up and down together (not shown in the figure, its structure can be, but not limited to, as in Example 1 shown), the negative electrode sheet (not shown in the figure, its structure can be but not limited to that shown in Example 1) and the separator, and there is a separator between any adjacent positive electrode sheet and negative electrode sheet.

[0038] At least one width end of each positive electrode sheet and negative electrode sheet is respectively extended with a protruding tab welding part 301 from the metal current collector, and the surface of the tab welding part 301 is not coated with an active material layer, so that the metal collector Fluid exposed.

[0039] The laminated lithium-ion cell body can be made by "Z"-shaped laminations or bag-type laminations or other laminations.

[0040] After the lamination is comple...

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Abstract

The invention relates to the field of lithium batteries, and discloses a pole piece and a laminated electrical core body for a lithium ion battery. The pole piece comprises a metal current collector, the surface of the metal current collector is coated with an active material layer, the metal current collector is provided with a width end part extending to form a pole ear welding part, and the cross-section surface of the width end part of is coated with an insulating silicon layer. Short circuits caused by diaphragm puncture can be effectively avoided when the pole piece is in use.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a pole piece and a laminated electric core body for lithium ion batteries. Background technique [0002] Due to the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution, lithium-ion batteries have achieved great commercial success in the fields of mobile communication equipment and mobile electronic equipment. In recent years, its application range has expanded to power tools, electric vehicles, large energy storage facilities and other fields. [0003] Lithium-ion batteries used in traditional fields have relatively small capacity and low discharge rate, and the battery cell assembly mostly adopts a winding structure. The battery with winding structure has high requirements on the uniformity and consistency of the electrode sheet coating, and the internal resistance of t...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M2/26H01M10/058H01M50/531
CPCY02E60/10Y02P70/50
Inventor 曾纪术唐道平郭永兴陶芝勇曾坚义
Owner SHENZHEN HAIYING TECH
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