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Square lithium ion power battery and preparation method thereof

A power battery and lithium-ion technology, which is applied in the field of square lithium-ion power batteries and their preparation, can solve the problems of poor charge and discharge characteristics, cycle performance and safety performance, and achieve improved high-power charge and discharge characteristics, improved arrangement structure, Good safety and reliability

Active Publication Date: 2015-03-18
ZHEJIANG GODSEND POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution improves reliability and safety by simplifying the production process and structural design of power lithium-ion batteries, but it does not improve the structure of the battery cells and the arrangement of the battery cells in the battery, resulting in its charge and discharge characteristics, Poor cycle performance and safety performance

Method used

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  • Square lithium ion power battery and preparation method thereof
  • Square lithium ion power battery and preparation method thereof
  • Square lithium ion power battery and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0038] 1) Preparation of positive electrode active material: The raw material LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Ni(CH 3 COO) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 O is dissolved in absolute ethanol (an excess of 3% lithium salt is added to offset the loss of lithium at high temperature) to form a metal salt ethanol solution, and the lithium salt, nickel salt, manganese salt and cobalt salt in the metal salt ethanol solution The total concentration is 1mol / L.

[0039] Take 10mL metal salt ethanol solution and put it into a 100mL corundum crucible, put the corundum crucible into a box furnace preheated to 500°C, ignite, react vigorously in the air for 10 minutes, cool to room temperature 25°C, and obtain the preliminary The product, after grinding the preliminary product, put it into the box furnace again, annealed it at a high temperature of 800°C for 16 hours, and then cooled it to room temperature 25°C with the furnace to obtain the positive electrode active material.

[...

preparation example 2

[0043] 1) Preparation of positive electrode active material: The raw material LiNO 3 , Mn(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 O is dissolved in absolute ethanol (an excess of 3% lithium salt is added to offset the loss of lithium at high temperature) to form a metal salt ethanol solution, and the lithium salt, nickel salt, manganese salt and cobalt salt in the metal salt ethanol solution The total concentration is 2mol / L.

[0044]Take 10mL metal salt ethanol solution and put it into a 100mL corundum crucible, put the corundum crucible into a box furnace preheated to 500°C, ignite, react vigorously in the air for 10 minutes, cool to room temperature 25°C, and obtain the preliminary The product, after grinding the preliminary product, put it into the box furnace again, annealed it at a high temperature of 800°C for 16 hours, and then cooled it to room temperature 25°C with the furnace to obtain the positive electrode active material.

[0045] ...

preparation example 3

[0048] The preparation of the negative electrode plate with the negative active material coating on one side left uncoated: Weigh 93% modified natural graphite (Shenzhen Bestray Electronic Materials Co., Ltd., model CG-8), 3% conductive agent (Cabot50 conductive carbon black) and 4% water-based binder (the volume ratio of sodium carboxymethyl cellulose: styrene-butadiene rubber (SBR-1500) is 1:1), to obtain a mixture, adding relative to the mixing After vacuum stirring with 60% deionized water of the weight of the material, it is continuously double-sided coated on the copper foil and left on the same side of the same side of the copper foil, and the part that is not coated with the negative electrode active material coating is left on one side, and dried Continuous roll pressing after deionized water; after slitting, a negative electrode plate with an uncoated negative electrode active material coating on one side remains.

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Abstract

The invention discloses a high-capacity square lithium ion power battery comprising a square shell and a plurality of square battery cells, wherein each square battery cell is formed by winding a positive plate, a diaphragm and a negative plate into a square; and a positive current collector in the positive plate extends out of the square battery cell formed by winding and is cut and welded to form a positive current collector connecting end, a negative current collector in the negative plate extends out of the square battery cell formed by winding and is cut and welded to form a negative current collector connecting end, the positive current collector connecting ends of the plurality of square battery cells are connected with a positive terminal through positive convergence plates, and the negative current collector connecting ends of the plurality of square battery cells are connected with a negative terminal through negative convergence plates, so that the high-rate charging / discharging performance and circle performance of the square lithium ion power battery are improved. The invention also discloses a preparation method of a square lithium ion power battery; by using the preparation method, the production process is simplified, and the industrial and high-efficiency production is easily realized; and the prepared square lithium ion power battery has more excellent performance.

Description

technical field [0001] The invention relates to the field of lithium-ion power batteries and the preparation thereof, in particular to a square lithium-ion power battery and a preparation method thereof. Background technique [0002] As the world's energy and environmental protection situations become increasingly tense, lithium-ion batteries are increasingly favored by people as a new energy source. Due to its high energy density, light volume, small weight, environmental protection and pollution-free, lithium-ion batteries have become the main direction of new energy development. With the rapid development of electric vehicles, space technology, national defense industry, and power energy storage systems, higher requirements are put forward for the specific capacity, cycle life and safety of lithium-ion batteries. The chemical properties can be started from the aspects of electrode materials and improving the internal structure of large-capacity batteries. [0003] The d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M10/0525
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 孙建平倪九江周晓政王秀丽缪东栋张文魁宋晨路涂江平
Owner ZHEJIANG GODSEND POWER TECH
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