Preparation method of soft package cylindrical battery and soft package cylindrical battery

A technology of cylindrical batteries and soft packs, applied in small-sized batteries/battery packs, secondary batteries, battery pack components, etc., can solve the problem that the welding stability of the spot bottom welding of the negative pole lugs is not easy to control, and the weight of the packaging shell is large. , packaging batteries are easy to explode, etc., to achieve the effect of high-power discharge performance improvement, small pressure drop, and short moving distance.

Inactive Publication Date: 2017-05-10
EVE ENERGY CO LTD
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AI Technical Summary

Problems solved by technology

Ordinary steel shell cylindrical batteries require point bottom welding of the negative tab and welding of the upper cover plate for the positive tab. The process is complicated, and the welding stability of the negative tab bottom welding is not easy to control. It is easy to explode, and the weight of the steel-cased lithium-ion battery packaging case is not conducive to carrying

Method used

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  • Preparation method of soft package cylindrical battery and soft package cylindrical battery
  • Preparation method of soft package cylindrical battery and soft package cylindrical battery
  • Preparation method of soft package cylindrical battery and soft package cylindrical battery

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preparation example Construction

[0037] In the preparation method of the soft-pack cylindrical battery according to the present invention, the preparation of the pole piece includes the preparation of the anode piece, and the preparation of the anode piece includes: the mass ratio is 90-97:0.5-6:1.5-2.5 :1.0~2.0: 100~120 conductive agent graphite, conductive carbon black, sodium carboxymethyl cellulose, styrene-butadiene rubber and water are mixed, stirred at 20~30℃ for 1~4 hours, the stirring rate is 500~1000 revolutions per second to prepare anode slurry. Coat the obtained anode slurry on a copper foil with a thickness of 6-12 μm, dry it at 90°C for 10-30 minutes, then use a tablet machine to press and slice it, and spot-weld the tab on the empty foil in the center of the anode to obtain a long ×width×thickness=915mm×39mm×100μm lithium ion battery anode.

[0038] The preparation of the pole piece includes the preparation of the cathode piece, and the preparation of the battery cathode includes: lithium cob...

Embodiment 1

[0044] 1. Preparation of lithium-ion battery anode:

[0045] The mass ratio LD06-007-01 [conductive agent graphite]: SUPER-P (Timcal company) [conductive carbon black]: CMC [carboxymethyl cellulose]: BM-430B [styrene-butadiene rubber]: H2O=94.5:2 :1.5:2:110 Mix the above components, stir at 700rpm at 25°C for 2.5h, and make lithium ion battery anode slurry.

[0046] Among them, LD06-007-01 is the commercial model of conductive agent graphite (artificial graphite with an average particle diameter of 12.61 μm), and CMC is sodium carboxymethyl cellulose. BM-430B is the product model of styrene-butadiene rubber produced by Japan ZEON Company, with a tensile strength of 70kg / cm2. Then, the obtained anode slurry is coated on an 8 μm thick copper foil, dried at 90°C for 10 minutes, then pressed into pieces with a tablet machine, sliced, and the tab 3 is spot-welded on the empty foil in the center of the anode to obtain length × width × Thickness = 915mm × 39mm × 100μm lithium ion b...

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Abstract

The invention discloses a preparation method of a soft package cylindrical battery and the soft package cylindrical battery prepared by employing the method. The preparation method comprises preparation of a pole plate, wherein the preparation of the pole plate comprises the steps of preparing a pole plate main body and arranging a tab on the pole plate main body, the tab is arranged at a middle position of the pole plate main body, and the middle position is between third eighths and five eighths of a length direction of the pole plate main body. In the scheme, a current leading-out position is arranged at the middle position of the pole plate, so that the electron moving distance is short and the voltage drop is small during discharging of the battery.

Description

technical field [0001] The invention relates to the technical field of battery processing, in particular to a method for preparing a soft-packed cylindrical battery and a soft-packed cylindrical battery prepared by the method. Background technique [0002] Lithium-ion batteries have high energy density, long cycle life, good rate performance and safety performance, and are environmentally friendly. They are high-performance batteries and are mainly used in various energy storage and power fields. The lithium-ion battery industry is a new type of energy industry. The rapid development of new energy. [0003] Generally, cylindrical lithium-ion batteries are packaged with steel shells, such as Panasonic's 18650. Steel-shell cylindrical lithium-ion batteries have large volume specific energy and long cycle life, and are widely used. People continue to carry out steel-shell cylindrical lithium-ion batteries. For the new development of batteries, one of the key points in the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M2/02
CPCH01M10/0525H01M10/0587H01M50/107Y02E60/10Y02P70/50
Inventor 郑军欣葛辉明刘金成
Owner EVE ENERGY CO LTD
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