4 results about "Cell leakage" patented technology

Various embodiments provide for grouping cells in a cell library based on iterative clustering, which can be used for pruning the cell library. In particular, various embodiments provide for grouping cells in a cell library based on iterative clustering in view of a criterion (or cell attribute), and for pruning of the cell library based on the grouping of cells, which can optimize the cell library for the criterion. For instance, some embodiments provide for grouping cells in a cell library based on iterative clustering in view of leakage power and then applying cell library pruning to optimize for cell leakage power.

The invention discloses a DFV algorithm identification method and system for battery cell leakage characteristics, and relates to the technical field of an electrochemical energy storage system battery management system, and the method comprises the steps: carrying out the data preprocessing of a relaxation voltage signal of a battery cell, and obtaining a complex frequency domain impedance spectrum; defining a corresponding time constant set, and constructing a complex frequency domain response matrix; and optimizing a target function in the DFV algorithm. According to the method, more accurate results are obtained for different liquid leakage forms and early-stage liquid leakage detection through the liquid leakage characteristics identified by the method, the calculation complexity of the algorithm is low, the DFV algorithm is operated on the preprocessed data to realize rapid liquid leakage characteristics, and the algorithm can realize rapid liquid leakage detection through fusion of time-frequency domain signal processing and relaxation time distribution modeling. The problems that in a traditional liquid leakage detection method, sensor data dependence is high, the physical mechanism is not clear, and weak signal recognition sensitivity is low are solved, and accurate extraction and efficient diagnosis of early characteristics of battery cell liquid leakage are achieved.

This application relates to a leak-proof structure for a liquid-cooled battery pack, comprising a top cover, a battery module, a leak-proof tray, and a liquid-cooling plate. The leak-proof tray is disposed on the liquid-cooling plate, and the battery module is disposed within the leak-proof tray, with the battery module and the leak-proof tray being adapted to each other. The top cover is fitted onto the battery module, and the top cover abuts against the liquid-cooling plate. The leak-proof tray includes a heat-conducting sheet and a PC tray, with the heat-conducting sheet disposed on the PC tray, and the battery module abutting against both the heat-conducting sheet and the PC tray. This application significantly reduces the risk of battery pack leakage due to cell leakage, effectively avoiding short circuits between modules and between the battery module and the inner wall of the battery pack caused by cell leakage, thus improving the safety of the battery pack and consequently the safety of the energy storage system. This application has a simple structure, is easy to implement, has low cost, and good stability, and can well meet the needs of practical use.

The application discloses a back contact solar cell, a preparation method thereof and a photovoltaic module. The back contact solar cell comprises a substrate, a back surface of the substrate is provided with a plurality of P regions, a plurality of N regions and interval regions between the P regions and the N regions, the P region comprises a first tunneling layer and a P-type doped polysilicon layer, the first tunneling layer is located between the P-type doped polysilicon layer and the substrate, and the minimum distance between the P-type doped polysilicon layer and the interval region adjacent to the P-type doped polysilicon layer is 0.5-5 microns along the arrangement direction of the P regions. Thus, direct contact between the P-type doped polysilicon layer and the N-type doped polysilicon layer can be at least reduced or even avoided, so that the problem of cell leakage can be alleviated or even avoided.