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In order to meet the energy and voltage requirements required by the vehicle, the power battery system contains hundreds or thousands of cells. If they are directly assembled in groups, it is not convenient for assembly and manufacturing, and it is not conducive to post-maintenance. Therefore, the general power battery system Consists of single or multiple battery boxes. Generally speaking, a passenger car has only one battery box. The power battery part of a passenger car is usually composed of multiple battery boxes in series and parallel. Each battery box is composed of several battery modules, and the battery module is composed of several battery cells. Different cells use different fixing methods when forming modules. For groups of prismatic or pouch batteries, steel straps are usually used to fix the modules.
Special strapping belt for power battery module
After the cells are stacked into a module, the module maintains a certain size under the pressure of the pressurizing equipment, and the steel band binds the entire module through the positioning structure on the end plate, and finally the module is baked and fixed, so that the electricity Bonding between the cores. The cells of each module are bundled together with steel straps, which is not only convenient for grouping, but also adapts to the expansion phenomenon of the cells during the charging and discharging process.
At present, the steel straps used for bundling the cells are mainly made of 65Mn, stainless steel and other materials. Among them, the steel straps of 65Mn materials usually adopt the lap joint method of buckles, and the steel straps of stainless steel materials usually adopt buckles or laser welding. Lap method. The two ends are lapped and welded together to form a rectangular structure, which is bundled outside the multiple cells of the battery module; the anti-corrosion protective sleeve structure is sheathed at the lap welding of the two ends of the belt body, including the outer heat shrinkable tube and For the inner layer of hot-melt adhesive layer, when the anti-corrosion protective sleeve structure is heated, the outer layer of heat-shrinkable tube is thermally shrunk to melt and fix the inner layer of hot-melt adhesive layer on the lap welding at both ends of the belt body to form an anti-corrosion seal .
Special strapping belt for power battery module includes a belt body, and the two ends are overlapped and welded together to form a rectangular structure, so as to be bundled outside the plurality of cells of the battery module; The welding place includes the outer heat shrinkable tube and the inner hot melt adhesive layer. When the anti-corrosion protective cover structure is heated, the outer heat shrinkable tube shrinks, and the inner hot melt adhesive layer is melted and fixed on the belt body. Both ends are lap welded to form an anti-corrosion seal. The combination of the outer heat shrinkable tube and the hot melt adhesive can ensure the reliability of the sealing structure, and the use of the outer heat shrinkable tube can ensure better wear resistance, and it is not easy to expose local wear due to friction. Effectively sealed.
