In order to avoid the problems of life shortening or safety accidents caused by the surface defects of lithium batteries, it is necessary to study an efficient and accurate methods for lithium battery electrode plate defect detection. In this research, the simple Unet semantic segmentation network is used to detect defects of lithium battery. In order to improve the segmentation accuracy, first the coding structure in the original network is replaced with VGG16, which is similar to the Unet coding structure, to obtain the pre-training weights had been trained. Then, feature fusion module of the simply fusion pyramid network (SFPN) is added to the skip connection of the Unet network to avoid large information differences between feature maps. Finally, label smoothing is applied to optimize the loss function to prevent the network from overfitting. Through experimental verification, the accuracy of the semantic segmentation network optimized by the proposed method is improved to 93.70%, and the probability of false segmentation and segmentation discontinuity is significantly reduced. This optimization process has certain practical value.

In this paper, a circumvention design method which taking patent group as target, function requirement as the basis for circumvention and the extension theory as the theoretical tool was proposed. Firstly, online product reviews were used as requirement acquisition resources, which were transformed into several functional requirements by using natural language processing technology and extension primitive model. Secondly, the target patent group was researched by the keywords from the online reviews and IPC classification code, then the patent group function model was built by analyzing each patent text. Thirdly, the obtained function requirements were matched with the patent group function model to confirm the contents in patent group function model to be circumvented. Fourthly, the function requirements were guided by the extension analysis as the path for circumvention analysis, and the extension transformation was used to express the circumvention solution operation, then the new scheme was determined whether exists the technical features of infringement. Finally, a medicine storage box patent group was taken as case study to confirm the feasibility of the above process of patent group circumvention design. Taking functional requirements as the basis for circumvention can help reduce the influence of subjective judgment in confirming the content to be circumvented in the process of patent group circumvention, and at the same time ensure that the subsequent circumvention solution is carried out in the direction of satisfying users’ function requirements.

The impeller is the core component of the hydraulic turbine, and its blade shape significantly affects the performance of the hydraulic turbine. To enhance the power generation efficiency of pipeline turbines, a resistance pipeline hydraulic turbine with twisted impeller blades was proposed, and a numerical simulation was used to investigate the influence of twist angle on the impeller’s performance parameters in the water supply pipeline. The study results reveal that: in the case of the blade tip speed ratio of 2 and the pipeline flow velocity of 1.5 m/s, in the nine groups of impellers analysed from 0° to 45°, as the twist angle increases, both efficiency and output power decrease, but the static moment increases to different degrees within 27°, and the impeller with the torsion angle of 10° can increase the static moment by 22.37% while keeping the head loss, output power and efficiency basically unchanged. Increasing the static output moment of the impeller by twisting the impeller can improve the starting efficiency of the impeller, and the findings of this study can serve as a reference for optimizing the resistance pipeline turbine impeller design.