Secondary battery case molding method and secondary battery case manufactured thereby

Abstract

The invention relates to a secondary battery case molding method, in particular to a secondary battery case molding method, wherein in a process for manufacturing an oval flat plate material into a square secondary battery case through a transfer drawing process, firstly, an oval flat plate material is formed into a runway shape, then, transfer drawing is conducted, and a minimum load is applied to a mold and a material when an ironing process after drawing, which affects the size and appearance in each process, is performed.

Description

technical field [0001] The invention relates to a forming method of a secondary battery case, in particular to the process of manufacturing an oval flat plate material into a square secondary battery case through a transfer stretching process, the oval flat plate material is first formed into a racetrack shape, and then transferred and stretched (transfer drawing), so that when performing stretching that affects the size and appearance of each process, it is a secondary battery case molding method that places the minimum load on the mold and materials during ironing. Background technique [0002] With the promotion of new renewable energy as an important energy source leading the next generation, the increasing importance of discontinuous new renewable energy power generation and the resulting load regulation of the power system has become more important to the energy storage system (EnergyStorage System, ESS) care and technology development. [0003] In an energy storage d...

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Problems solved by technology

[0009] However, with the rapid progress of industrial integration and recombination, the focus of the market has changed from the small size of small IT equipment as the existing technology to medium and large sizes such as power supply units for electric vehicles and energy-connected storage devices (ESS). The case of molding with a small design method is different with the technology. Because the size of the mold is larger than the small mold of the prior art, when using the transfer press to repeat the stretching process to form a medium and large square shell, there are quality aspects such as material flow. The problem

[0010] That is to say, the final shape of the square shell that is expected to be manufactured is that the front and back shapes are straight lines, but because the shape of the initial stretching process is a curve, during the stretching process of the directional shell, due to the large load of folding deformation, the When the shape is forcibly completed during ironing

[0011] In addition, when carrying out each stretching process, more of the material of the thickness of the square shell 2 is moved to the side of the short side, and the reduction of the short side becomes larger, and the front and back of the finally manufactured square shell 2 do not move smoothly due to the material , with problems of non-uniform size and appearance

[0012] In addition, because the square shell is medium and large, the tensile strength needs to be increased, and a suitable strong material is used as needed, but if a strong material is used for plastic deformation, the mold and material will be subject to more load during stretching , resulting in bad

[0013] In addition, due to non-similarity processing in which a square case is processed from a cup-shaped intermediate product with a circular cross-sectional shape to a nearly rectangular battery case, the material flow during processing is not uniform, and stable processing cannot be performed. , it is easy to crack or break on the short side plate with a small area, and there is a problem that there is a part of deformed shape

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