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Nonaqueous electrolytic solution secondary battery and method for preparing the same

A non-aqueous electrolyte and secondary battery technology, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, electrodes of non-aqueous electrolyte batteries, etc. It can solve the problem of long electrolyte injection time, production process and difficulty in uniformity of electrolyte Solve problems such as soaking, achieve the effect of shortening the electrolyte injection time and shortening the injection time

Inactive Publication Date: 2008-10-01
SEKISUI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a relatively large non-aqueous electrolyte secondary battery, the injection time of the electrolyte is very long, which becomes a problem in the production process
In addition, in non-aqueous electrolyte secondary batteries of large and small sizes, it is difficult to uniformly penetrate the electrolyte
Furthermore, secondary batteries need to stack multiple positive plates, negative plates, and separators with large areas. However, due to the large area, stacking deviations are likely to occur in the process of stacking positive plates, negative plates, and separators and subsequent processes.

Method used

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  • Nonaqueous electrolytic solution secondary battery and method for preparing the same
  • Nonaqueous electrolytic solution secondary battery and method for preparing the same
  • Nonaqueous electrolytic solution secondary battery and method for preparing the same

Examples

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Effect test

Embodiment 1

[0086] In positive electrode making, positive electrode active material uses 100 parts by weight of LiMn204, conductive material uses acetylene black of 5 parts by weight, binder uses PVdF of 5 parts by weight, solvent uses N-methyl-2-pyrrolidone (NMP), by Dispersion is carried out by kneading by a planetary mixer. In this way, a positive electrode paste was produced. The prepared paste was uniformly applied to both surfaces of a strip-shaped aluminum foil having a thickness of 20 μm as a current collector of the positive electrode plate with an application device, leaving an uncoated portion. It was dried under reduced pressure at 130° C. for 8 hours, and then punched with a hydraulic press. Thereby, a positive electrode plate is formed and cut to a predetermined size. Thus, a positive electrode plate having a width of 252 mm, a length of 320 mm, and a thickness of 80 μm was produced.

[0087] In the production of the negative electrode, the negative electrode active mater...

Embodiment 2

[0094] In Example 2, the width of the separator was 256 mm, and the width of the negative plate was 256 mm. A positive electrode plate of the same size as in Example 1 was sandwiched between the two separators. The total projected length of the separator projected from the length (width) of the short side direction of the positive electrode plate was 4 mm. Other than that, a battery was fabricated in the same manner as in Example 1.

Embodiment 3

[0096] In Example 3, the width of the separator is 262 mm, and the width of the negative plate is 262 mm. A positive electrode plate of the same size as in Example 1 was sandwiched between the two separators. The total projected length of the separators projected from the length (width) of the short side direction of the positive electrode plate was 10 mm. Other than that, a battery was fabricated in the same manner as in Example 1.

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Abstract

The invention provides a secondary battery that is capable of shortening injecting time for injecting an electrolytic solution, and infiltrating the electrolytic solution uniformly, during a process for preparing the secondary battery. Also, the invention provides the secondary battery in which discordance of layers of positive-electrode plates, negative-electrode plates, and separators does not easily occur during a process for laminating them and the following process. A nonaqueous electrolytic solution secondary battery of the present invention comprises: negative-electrode plates which are rectangular; positive-electrode plates which each have a pair of opposed sides shorter than a pair of opposed sides of each negative-electrode plate; separators which each are formed of a porous resin film enclosing each positive-electrode plate; an enclosure which encloses the negative-electrode plates and separators which are laminated alternately, in which a direction of the sides of the negative-electrode plates aligns with a direction of the shorter sides of the positive-electrode plates; and an injection pathway for the nonaqueous electrolytic solution, which the pathway being formed between the negative-electrode plates between which the separator is sandwiched, the pathway being formed at edges of opposed sides of the negative-electrode plates.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery formed by laminating a positive plate, a separator and a negative plate, and a manufacturing method thereof, in particular to a non-aqueous electrolyte secondary battery for improving the manufacturing process of a large-scale non-aqueous electrolyte secondary battery. secondary battery. Background technique [0002] In a large non-aqueous electrolyte secondary battery, since the electrode plate has a large area, the injection time of the electrolyte solution becomes a problem in the electrolyte solution injection process, and the lamination misalignment becomes a problem in the electrode plate lamination process. [0003] For example, Patent Document 1 is included as an invention related to the size of a positive electrode, a negative electrode, and a separator. Patent Document 1 discloses a structure in which a separator protrudes 1.5 mm to 2.5 mm from an end in the width d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/04H01M4/02H01M2/14H01M4/13H01M10/0566H01M10/0585H01M50/129H01M50/414H01M50/627
CPCH01M2/1653H01M10/052H01M2/0267Y02E60/122H01M2/361Y02E60/12H01M2/0275Y02E60/10Y02P70/50H01M50/129H01M50/627H01M50/414
Inventor 内海久幸西岛主明小林慎介
Owner SEKISUI CHEM CO LTD