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Arc-shaped lithium ion secondary battery and manufacturing method thereof

A secondary battery and manufacturing method technology, applied in the secondary battery, electrolyte storage battery manufacturing, battery electrode and other directions, can solve problems such as inability to meet, and achieve the effects of large bending arc, high reliability and high yield

Active Publication Date: 2017-09-29
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In claim 8 disclosed in the patent document CN204424395U, it is clearly stated that the radian is 0-150°, and the range of the ratio of the arc length to the radius of curvature is 0-2.6, which cannot meet this requirement

Method used

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  • Arc-shaped lithium ion secondary battery and manufacturing method thereof
  • Arc-shaped lithium ion secondary battery and manufacturing method thereof
  • Arc-shaped lithium ion secondary battery and manufacturing method thereof

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preparation example Construction

[0040] Preparation of the positive pole piece: the positive active material lithium cobaltate, the binder polyvinylidene fluoride (PVDF) and the conductive agent Super-P are added to N-methylpyrrolidone (NMP) according to the weight ratio of 96:2:2 and stirred evenly The slurry is made into positive electrode slurry; the positive electrode slurry is double-coated on the positive electrode current collector, and the positive electrode sheet is obtained after drying, compacting, slitting, cutting, and welding tabs.

[0041] Preparation of negative electrode sheet: Negative electrode active material silicon-carbon composite material, styrene-butadiene rubber (SBR), sodium carboxymethyl cellulose (CMC), according to the ratio of 95:2.5:2.5, add deionized water and stir to make negative electrode slurry material; the negative electrode slurry is double-coated on the negative electrode current collector, and the negative electrode sheet is obtained after drying, compacting, slitting,...

Embodiment 1

[0066] Refer to the battery production instructions to prepare lithium-ion secondary batteries. The positive electrode collector uses aluminum alloy foil with a grade of 3003 and the state is H18 with a thickness of 20 μm, the negative electrode current collector uses copper foil with a thickness of 8 μm, and the separator uses polyethylene with a thickness of 12 μm. The diaphragm is processed into a curved shape with a bending jig.

Embodiment 2

[0068] Refer to the battery production instructions to prepare lithium-ion secondary batteries. The positive electrode current collector uses aluminum alloy foil with a grade of 3003 and the state is H18 with a thickness of 20 μm. The negative electrode current collector uses copper foil with a thickness of 8 μm. The separator uses a non-woven separator with a thickness of 25 μm. , processed into an arc with a bending jig.

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Abstract

The invention relates to an arc-shaped lithium ion secondary battery and a manufacturing method thereof. The battery is processed into an arc shape through a bending jig; at least one of a battery length direction and a battery width dimension is smaller than 15 mm; a ratio of bent arc length of the arc shape to the maximum curvature radius of the bent part is between 1.5 and 5; and after the battery is repeatedly bent by smaller than or equal to 5 times, a change rate of direct-current internal resistance and capacity of the battery is smaller than 10%. The invention further discloses a manufacturing method for the arc-shaped lithium ion secondary battery. The battery is small in battery dimension, is relatively great in the ratio of the arc length to the curvature radius, and can be effectively put into wearable equipment with a small size; and the battery is high in reliability, is not liable to bend when assembling apparatus, is more convenient to use, and has a higher yield.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to an arc-shaped lithium-ion secondary battery with small size, large curvature and high reliability and a manufacturing method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high voltage and high energy density. With the continuous development of portable electronic products, small wearable smart devices such as smart rings and smart bracelets appear, which put forward the demand for curved lithium-ion secondary batteries. [0003] However, as these wearable devices become smaller and smaller in size, for example, many smart bracelets are now about 15mm in width, and the width of smart rings is less than 10mm, which requires curved lithium-ion secondary batteries to be smaller in width and bendable. The arc is larger. At the same time, for the demand for the smart ring, since the ring has various bending sizes...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/66H01M4/02H01M2/16H01M4/139H01M10/058
CPCH01M4/02H01M4/139H01M4/661H01M4/662H01M10/0525H01M10/058H01M2004/021H01M50/409Y02E60/10Y02P70/50
Inventor 翟传鑫张小海徐子福路佳顺张明慧
Owner 安普瑞斯(无锡)有限公司
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