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Break-resistant high-energy-density lithium ion battery positive plate and preparation method

A lithium-ion battery, high energy density technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems affecting battery electrical performance and safety performance, cell failure, etc., and achieve high production efficiency and stable structure. , the effect of strong feasibility

Active Publication Date: 2016-03-30
东莞凯德新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Seriously affect the electrical performance and safety performance of the battery, such as figure 2 As shown, if there is a U-shaped crack 11 in the positive tab, it will directly lead to the failure of the battery cell.

Method used

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  • Break-resistant high-energy-density lithium ion battery positive plate and preparation method
  • Break-resistant high-energy-density lithium ion battery positive plate and preparation method
  • Break-resistant high-energy-density lithium ion battery positive plate and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-energy-density lithium-ion battery positive electrode sheet for anti-fracture, comprising a first positive electrode material layer, an aluminum foil and a second positive electrode material layer from top to bottom, such as image 3 As shown, the surface of the aluminum foil is provided with an empty aluminum foil part 1 arranged vertically, the empty aluminum foil part 1 is welded with a positive electrode ear 2, and the lower half surface of the empty aluminum foil part 1 is pasted with an anti-crack glue 3, and the positive electrode The ear 2 includes a cap welding part 21, a middle welding part 23 and a tail part 24 from top to bottom. The tail part 24 is attached to the surface of the anti-break adhesive 3, and the middle welding part 23 is arranged on the empty aluminum foil part. 1, the cap welding portion 21 of the positive tab 2 protrudes from the upper end of the hollow aluminum foil portion 1 .

[0037] Put a layer of anti-fracture glue 3 on the empt...

Embodiment 2

[0042]The difference between the present embodiment and the first embodiment is that there is also a wrapping glue portion 22 between the cap welding portion 21 and the middle welding portion 23 of the positive tab 2 , and the wrapping glue portion 22 is provided with a wrapping glue. After the positive pole ear 2 is welded, the cap will be bent into the steel shell, and the glue can prevent the positive pole ear 2 from touching the negative pole steel shell and short-circuiting. The width of the rubber-wound portion 22 is consistent with the width of the positive tab 2 , and the length of the rubber-wound portion 22 is 13-15 mm.

[0043] Preferably, in this embodiment, the lower end of the glue-wound part 22 is arranged on the upper end of the hollow aluminum foil part 1, that is, the glue-wrapped part 22 is partly exposed outside the aluminum foil, and partially penetrates into the aluminum foil, so as to further prevent the positive electrode ear 2 from When the aluminum fo...

Embodiment 3

[0048] The difference between this embodiment and embodiment 2 is that: the apex angles of the cross section of the positive tab 2 are all smooth and rounded. The cross-section of the traditional positive tab 2 is generally square, and the presence of right angles will generate more sharp edges, and it is easy to break down the aluminum foil when a high-energy current is formed instantaneously. Therefore, in this embodiment, the right angle of the positive tab 2 is changed to a rounded corner, and The surface of the positive tab 2 is smoothed to reduce burrs and the risk of easy breakdown, improve the safety performance of the battery, and also increase the life of the battery.

[0049] The surface of the positive tab 2 is also covered with tab glue, which seals the burrs on the edge of the positive tab 2 and the welding mark, and prevents the burrs from piercing the diaphragm after winding to cause an internal short circuit. Preferably, the width of the tab glue is greater tha...

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Abstract

The invention relates to the technical field of lithium ion battery preparation, in particular to a break-resistant high-energy-density lithium ion battery positive plate and a preparation method. The break-resistant high-energy-density lithium ion battery positive plate comprises a first positive material layer, an aluminum foil and a second positive material layer from top to bottom, an empty aluminum foil part is arranged on the surface of the aluminum foil, a positive lug is welded at the empty aluminum foil part, a break-resistant adhesive is adhered on the surface of the lower half part of the empty aluminum foil part, the positive lug comprises a cap welding part, a middle part welding part and a tail part from top to bottom, the tail part is adhered on the surface of the break-resistant adhesive, the middle part welding part is arranged at the middle part of the empty aluminum foil part, and the cap welding part of the positive lug extends out of the upper end of the empty aluminum foil part. During preparation, the break-resistant adhesive is adhered on the empty aluminum foil part coated with a positive material, the positive lug wound with winding adhesive is welded, and then a layer of electrode lug adhesive is respectively adhered on parts, located on the two surfaces of the positive plate, of the empty aluminum foil part. The positive plate has a simple structure and good break-resistant effect, and can support the use of a lithium ion battery with high volume energy density.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a fracture-resistant high-energy-density lithium-ion battery positive electrode sheet and a preparation method. Background technique [0002] With the continuous development of electronic technology, the application of lithium-ion batteries is becoming more and more extensive. Based on market requirements, the longer the continuous working time of products using lithium-ion batteries, the better, which requires the lithium-ion batteries that provide electrical energy to have higher volumetric energy density. When designing a lithium-ion battery with high volumetric energy density, the areal density and compaction density of the positive and negative electrodes are both large. [0003] When the battery is filled with liquid, the thickness of the positive and negative electrodes begins to rebound. After formation and volume separation, the thickness of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 黎惠锋刘青
Owner 东莞凯德新能源有限公司
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