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Li-ion batteries have been widely used. However, the safety concern is always serious due to its high energy density. In order to improve the safety of the batteries, it is necessary to use the protection integration circuit. In this article, the concept for realizing the safety protection of Li-ion batteries during charging and discharging is described briefly. A circuit design using Seiko BMS chip S-8209 is purposed. Based on this, a simulation was performed and verified using Pspice program, which provides a theoretical basis for the circuit design.

A new method is proposed to calculate the background in video sequences. The optical flow is estimated to determine the local regions occupied by moving objects. The background image is calculated by an efficient averaging process excluding the moving object regions, which overcomes the foreground-occluding problem in direct averaging method for background estimation. The experiments for traffic video processing prove the method’s effectiveness and robustness.

A novel vector field transform is proposed for digital images, which is inspired by the electro-static analogy. By introducing the factor of gray-scale difference into the repulsion vector between image points, the diffusing vector field is obtained by the transform. A new image segmentation method is then presented based on the diffusing vector field. The experimental results have proved the method’s effectiveness.

A physics-inspired deformable grid model is proposed for image structure representation. The attracting force between adjacent points is defined according to the gray-scale difference, which causes the grid to deform. The final grid shape after deformation can represent image structure, based on which a segmentation method is proposed. The experiments indicate the method’s effectiveness.