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Secondary cell and its manufacturing method

A secondary battery and manufacturing method technology, which is applied in secondary battery manufacturing, secondary battery, electrode manufacturing, etc., can solve the problems of reduced electrolyte impregnation and uneven distribution of electrolyte, and achieves excellent impregnation and cycle characteristics and excellent reliability, the effect of suppressing internal short circuit

Inactive Publication Date: 2009-08-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the density of the active material is increased, the impregnation of the electrolyte solution will decrease due to the decrease in porosity, and as a result, there is a problem that the distribution of the electrolyte solution in the electrode group becomes uneven.

Method used

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  • Secondary cell and its manufacturing method
  • Secondary cell and its manufacturing method
  • Secondary cell and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] First, 100 parts by weight of lithium cobaltate as an active material, 2 parts by weight of acetylene black as a conductive agent relative to 100 parts by weight of an active material, and 2 parts by weight of acetylene black as a binder relative to 100 parts by weight of an active material The polyvinylidene fluoride of the agent was stirred and kneaded with an appropriate amount of N-methyl-2-pyrrolidone, thereby preparing a positive electrode mixture slurry. This positive electrode mixture slurry was coated on a current collector made of aluminum foil with a thickness of 15 μm, dried, and press-worked to a total thickness of 170 μm.

[0100] Secondly, if image 3 As shown in (a), prepare the upper roll 15 formed with the convex portion 17 having a tip angle α of 115° and a height d of 25 μm inclined at an angle of 45° with respect to the central axis of the upper roll 15, and one without the convex portion. Lower roll 16, such as figure 2 As shown, the press-worke...

Embodiment 2

[0106] An electrode group was produced in the same manner as in Example 1, except that grooves 30 were formed on both surfaces of the positive electrode plate 1 using the same roll as the upper roll 15 used in Example 1 as the lower roll 16 . In addition, the grooves 30 formed on both sides of the positive electrode plate 1 are as Figure 6 As shown in (a), an inclination angle of 45 degrees is formed with respect to the longitudinal direction of the positive electrode plate 1 , and the phases are symmetrical on both sides of the positive electrode plate 1 .

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Abstract

The invention relates to a secondary cell which has an electrode group (5) fabricated by winding positive and negative electrode sheets (1, 2) each comprising a current collector (1) and mix layers (8, 9) formed on the current collector and containing active materials and a separator (3) interposed between the electrode sheet. Grooves (30) are formed in the surface of the mix layers (8, 9) of at least one of the positive and negative electrode sheets (1, 2). Each groove (30) has curvatures at the end portions (30b) of the side surfaces and the central portion (30a) of the bottom surface. The grooves (30) are continuously formed in the surfaces of the mix layers (8, 9) for on both sides of the electrode sheet (1) at intervals of 200 [mu]m or less along the length direction of the electrode sheet (1). The phases of the grooves(30) are shifted from one another.

Description

technical field [0001] The present invention relates to a secondary battery having an electrode group, which is formed by winding or stacking a positive electrode plate and a negative electrode plate separated by a separator; in particular, it relates to a high-capacity secondary battery with excellent impregnation properties of an electrolyte solution and its method of manufacture. Background technique [0002] In recent years, lithium-ion secondary batteries, which have been widely used as power sources for portable electronic devices, use carbon materials that can intercalate and deintercalate lithium as the negative active material and LiCoO2 as the positive active material. 2 Composite oxides of transition metals such as transition metals and lithium have achieved high-potential and high-capacity secondary batteries, but with the multifunctionalization of electronic equipment and communication equipment in recent years, further high-capacity is expected. [0003] For e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/70H01M4/13H01M4/139H01M10/0525H01M10/0587H01M10/36
CPCH01M10/0431Y02E60/122H01M10/0587H01M10/0525H01M4/139H01M4/13Y02E60/10Y10T29/49108Y02P70/50H01M4/0435H01M2004/021
Inventor 熊切英幸加藤诚一
Owner PANASONIC CORP
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