Quality inspection technology in lithium battery production

by:CTECHi     2021-07-11

With the popularization of EVs and PHVs, it is expected that the global demand for secondary batteries and storage batteries will continue to increase substantially in the future. In order to popularize electric vehicles with longer cruising range, lithium batteries are required to develop towards high capacity, miniaturization and low cost. Lithium batteries have the risk of causing major accidents such as fire, so very rigorous testing is required. The following introduces KEYENCE's image processing technology, which has become the key to quality assurance.

Appearance inspection of positive and negative materials

In order to carry out the quality management of positive and negative materials, it is necessary to inspect the surface condition and Homogeneity. KEYENCE pretreatment eliminates disturbances such as deviations in shades caused by wrinkles in the sheet to achieve stable detection.

Positioning of the electrode stack

The offset of the electrode stack can lead to risks such as poor insertion of the outer cylinder or battery leakage. High-precision electrode position control can be performed through the positioning system. KEYENCE positioning system can realize a series of operations such as picture taking, calibration, search setting, positioning setting, debugging, etc. in a short time.

Insulation film clamping detection before welding

It is possible that the transparent insulating film may be exposed after the battery cell is inserted. Destruction of the battery's airtightness, leading to risks such as leakage. With KEYENCE LumiTraxTM, it is possible to clearly photograph the edges of the film that are not easy to see

Detection of poor welding after sealing

If the surface of the welded part is defective, there is a risk of fire, and high-precision inspection is required. The XT camera can acquire 3D images of the welding shape without being affected by the state of reflection on the welding surface, and achieve high-precision detection.

Battery shell appearance inspection

In order to maintain the strength of battery cells and modules, it is important to detect dents and defects in the shell The inspection process. In the past, it was difficult to distinguish and detect the unevenness of density such as fine dents, flaws, and slight stains on the metal surface. Through the LumiTraxTM mirror reflection mode, it is possible to perform stable detection of only the detection targets such as dents or blemishes.

Battery robot picking

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