Power battery and manufacturing method thereof

Abstract

The invention discloses a power battery and a manufacturing method thereof. The method comprises the following process steps of: manufacturing a positive pole piece; manufacturing a negative pole piece; performing die cutting on the positive and negative pole pieces; laminating the positive and negative pole pieces to form an inner core; baking the inner core; assembling and welding; infusing liquid into the cell; ageing the cell; detecting the electrical property; and performing formation and grading capacity so as to finally obtain the power battery. The power battery is simple in process and convenient to manufacture, and by adoption of the laminating process, a 500Ah cell unit can be realized; and the power battery manufactured by the method has the advantages that use is safe, maintenance is easy, inner core capacity is large and the like.

Description

【Technical field】 [0001] The invention relates to a battery, in particular to a power battery and a manufacturing method thereof, belonging to the technical field of new energy sources. 【Background technique】 [0002] With the gradual introduction of electric vehicles into the market, the core components of electric vehicles - automotive power batteries and their manufacturing methods have become the focus of attention. At present, there are the following types of batteries used in electric vehicle batteries on the market: soft-pack batteries, cylindrical batteries, square steel-shell batteries, and square aluminum-shell batteries. The use of soft-packed batteries basically uses 10Ah and 20Ah batteries, and repacks them into large battery packs for use. There are relatively large safety hazards in the process of assembly and use, and the basic parameters of the batteries change greatly during use. The use performance is also relatively poor, and the assembly and production ...

AI Technical Summary

Problems solved by technology

The use of soft-packed batteries basically uses 10Ah and 20Ah batteries, and repacks them into large battery packs for use. There are relatively large safety hazards in the process of assembly and use, and the basic parameters of the batteries change greatly during use. The use performance is also relatively poor, and the assembly and production process is also more troublesome; the cylindrical inner core is currently basically using 3Ah26650 batteries or other 10Ah, 20Ah cylindrical batteries, which have many contacts during the assembly process, and the space utilization rate after the battery combination is small. 1. The assembly cost is high. Due to the many contacts in the use process, there are great safety hazards and complicated maintenance during the use of the battery core; the inner core of the square steel shell and aluminum shell is self-heavy, and there is a hidden danger of explosion in the event of a safety accident.

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