Research Of Electrode Materials And Assembly Methods On The Performance Of MH-Ni Battery For New Energy Vehicles

With the increasing depletion of fossil energy and the increasing attention paid by human beings to environmental protection,new energy vehicles have gradually attracted people's attention due to their advantages of low fuel consumption and low emissions.However,due to the need to continue to develop and perfect the technology of pure electric vehicles,the hybrid electric vehicle with relatively mature technology has become the goal of near-term development.As the first-selected power battery for hybrid vehicles,nickel-metal hydride battery's performance is related to the vehicle's fuel-saving effect.In order to improve the performance of the nickel-metal hydride battery,this article is to improve the battery performance by improving the negative electrode substrate and improving the internal connection resistance to reduce the internal resistance of the electrode.An important factor that affects battery power performance is the battery internal resistance.The battery power performance corresponding to a battery with a small internal resistance is good.One factor for the internal resistance of the battery is the connection resistance of the current collector inside the battery.By improving the appearance of the lugs and welding methods,by designing different styles?collector disc type and bipolar lugs?and different welding methods?four welding points,six welding points,eight welding points?,the welding area is increased,thereby reducing.The internal resistance of the connection inside the battery reduces the AC resistance and DC resistance of the battery to improve the battery performance,mainly the power performance.For this experiment,through the test comparison,the internal resistance of the battery made by the current collector disc tab and six-point welding has been significantly reduced,and the power performance is the best.The polar plate substrate is both an active material carrier and a conductive frame inside the battery.By improving the negative electrode substrate,a punching nickel-plated steel belt with different pore diameters is designed.The slurry coating effect has a certain influence,and the degree of influence of the substrate pattern on the battery performance is tested.After a comparative test,for this experiment,the battery power performance,low temperature performance and self-discharge performance of a steel belt with a diameter of1.2 mm are better than batteries made with a steel belt with a diameter of 1.0 mm.In addition to the performance of the nickel-metal hydride battery assembly process,the performance of the anode material-hydrogen storage alloy also has an important impact on the battery performance.Through the study of AB₅ type hydrogen storage alloy La_0.70Ce_0.30Ni_4.25+xCo_0.35Mn_0.55-xAl_0.15.15 with different proportions of Mn elements,x=0,0.1,0.2,0.3,measured by comparative experiments,with Mn With the reduction of elements,the lattice constant and unit cell volume of the alloy gradually decrease,which leads to the gradually increasing pressure of the hydrogen releasing platform of the alloy.The maximum discharge capacity of the alloy gradually decreases,and the high rate discharge and cycle stability first increase and then decrease.In order to study the degree of influence of Ni element instead of Mn element on the performance of nickel-hydrogen batteries,two alloy powders of La_0.70Ce_0.30Ni_4.25+xCo_0.35Mn_0.55-xAl_0.15?x=0 and x=0.2?.And the battery test performance is prepared,the power performance,low temperature performance and cycle life of x=0.2 alloy are better than x=0 battery.