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Rechargeable lithium ion button cell battery

A button battery and rechargeable lithium technology, applied in secondary batteries, battery pack components, secondary battery manufacturing, etc., can solve problems such as configuration practicability doubts

Active Publication Date: 2015-02-04
ZHUHAI ZHI LI BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It's a bold design, but the practicality of its configuration is questionable

Method used

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  • Rechargeable lithium ion button cell battery
  • Rechargeable lithium ion button cell battery
  • Rechargeable lithium ion button cell battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0081] refer to figure 1 , the inventors of the present invention produced a lithium-ion rechargeable button battery of model Z23 with a diameter of 7.8 mm and a height of 5.3 mm according to the method described above.

[0082] The battery cases 1 and 3 are made of nickel-plated stainless steel, which can be 316, 304 or 430, and its thickness is between 0.1 and 0.15 mm, preferably 0.125 mm. The standing edge 1c of this anode cover is single-layered. The apron 2 is formed by injection molding of polypropylene, with a thickness between 0.06 and 0.15 mm, preferably 0.12 mm.

[0083] The cathode is preferably made of lithium-rich materials such as lithium nickel manganese cobaltate and other additives mixed with NMP as a solvent under vacuum, and the mixed slurry is coated on both sides of the aluminum foil with a thickness of 0.01 to 0.025 mm, preferably 0.012 mm. The coated material is heated and dried and pressed to the required thickness in a counter roll machine, usually ...

example 2

[0090] refer to image 3 , most of the accessories, materials and process flow are similar to Example 1, except that the cathode current collector 7 is pre-welded on a circular aluminum sheet 10, which is usually 0.05 mm thick, such as Figure 5 . The aluminum sheet 10 is pre-attached with an O-shaped insulating pad 11a with a hole in the center. After welding with the current collector 7, another round insulating pad 11 is taken to completely cover the exposed metal part of the welded part. After filling the electrolyte, the metal sheet 10 is folded back and covers the winding core. Finally put on the shell 3 to realize sealing by buckling the edge.

[0091] The performance of the manufactured battery is also similar to that of Example 1, except for the pre-welding process of additional aluminum sheets 10 and conductive tabs 7, which may increase the risk of failure rate. In addition, the 0.05 mm thick aluminum sheet needs to occupy a little more internal space, and the ca...

example 3

[0093] refer to Figure 4 , most of the accessories, materials and process flow are similar to Example 1, except that the cathode current collector 7 is directly welded on the inner plane 3a of the shell. This requires a longer current collector 7, otherwise the ultrasonic welding of the bottom cannot be realized due to the hindrance of the shell standing edge 3b. In order to completely cover the exposed metal in the shell, an O-shaped insulating pad 11a with a hole in the center must be pasted on the inner plane 3a of the shell in advance. After welding with the current collector 7, another round insulating pad 11 is taken as a whole. Cover the exposed metal part of the weld. After liquid injection, the long current collector 7 needs to be bent several times to be inserted into the interior of the battery and complete buckling and sealing.

[0094] The performance of the manufactured battery is also similar to that of Example 1 and Example 2, except for the risk that the lo...

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Abstract

A rechargeable lithium ion button cell battery having a sealed housing comprises an inner casing and an outer casing , both casings have at least one flat area as top or bottom of the battery, and a round or oval sidewall vertically formed to the flat area. An insulation gasket is positioned between said sidewalls, and the outer casing opening is mechanically crimped to complete the seal of the battery. Inside the sealed housing the anode and cathode electrodes are spiral wound with separator to be a round or oval roll. Said roll axis is vertical to the said flat areas of the casings. The two electrodes are tapered in width to fully utilize the inner space. The electrodes comprise current collectors of metal foils coated with lithium-intercalating active materials, leaving small area of uncoated metal foils as conductor tabs for connecting the electrodes to the casings. The tabs could be welded or by tight contacting to the casings, in several options. Insulation washers or tapes are applied to the naked metal surfaces of the electrodes or casings inside of the housing to prevent short circuit and enable the battery to have longer cycle life.

Description

technical field [0001] The invention relates to a battery, in particular to a rechargeable lithium ion button battery. Background technique [0002] Rechargeable lithium-ion batteries and lithium pouch batteries are widely used in sustainable electronic devices such as mobile phones and earphones. In particularly small devices such as hearing aids, volume-specific energy density is a key consideration. Wang Fang et al. published on April 21, 2011 in the U.S. patent titled "A Novel Button Battery Configuration Method for Spiral Winding Electrodes" (application number 12 / 881,179 and publication number 2011 / 0091753A1), A method in which the volume-specific energy density is extremely dominant in lithium pouch or laminated electrode coin cells is described. A detailed comparison of the different previous processes is also discussed in this patent document. [0003] In U.S. Patent Application No. 12 / 881,179, the width of the electrodes is tapered to form a shoulder to accommod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/26H01M2/34H01M2/08H01M50/469H01M50/534H01M50/538
CPCH01M2/263H01M10/0431H01M2/0222Y02E60/122H01M10/0525H01M10/0587H01M10/0427H01M50/109H01M50/171H01M50/538H01M50/534H01M50/469Y02E60/10Y02P70/50
Inventor 王昉孙法炯
Owner ZHUHAI ZHI LI BATTERY
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