电池的健康状态 SOH 估计
SOH(State of Health)估计通常用于描述电池的健康状态,即电池当前容量与初始容量的比值。
一种常见的SOH估计方法是基于经验的电池寿命预测方法,包括循环周期数法、安时法与加权安时法、面向事件的老化累积方法。这些方法都是利用电池使用过程中的一些经验知识,依据某些统计学规律给出电池寿命的一个粗略估计,只适用于电池使用的经验知识比较充分的情况下,用于特定场合的寿命预测。
另一种SOH估计方法是基于耐久性模型的开环方法,这种方法描述了固体电解质膜电阻和电池端子电压的增加,对电池内部的物理化学反应的特性进行分析,了解电化学反应特性和电池容量衰退的本质,从而直接预测容量衰减和内阻的变化。
T=298.15%25度的绝对温度
for i=1:9000
% Q(i)=30330*exp(-31500/(8.314*T))*i.^0.552;
Q1(i)=16437*exp((-31700+370.3*3)/(8.314*T))*i.^0.55; %0.5C
Q2(i)=14892*exp((-31700+370.3*4)/(8.314*T))*i.^0.55; %2C
Q3(i)=13795*exp((-31700+370.3*5)/(8.314*T))*i.^0.55; %6C
Q4(i)=12291*exp((-31700+370.3*7)/(8.314*T))*i.^0.55; %10C
end
figure
plot(100-Q1,'-b','linewidth',2')
hold on
plot(100-Q2,'-G','linewidth',2)
hold on
plot(100-Q3,'-K','linewidth',2)
hold on
plot(100-Q4,'-r','linewidth',2)
legend('3C','4C','5C','7C','Location','best');
legend('boxoff')
set(gca,'xtick',[0:1000:10000]);
set(gca,'ytick',[0:5:110]);
axis([1 7000 70 101]);
set (gca,'position',[0.16,0.15,0.8,0.8] );
set(gca,'Fontsize',14);
xlabel('Total Ah throughput (Ah)','FontName','Microsoft YaHei','FontWeight','Bold','FontSize',15)
ylabel('SOH(%)','FontName','Times New Roman','FontWeight','Bold','FontSize',15)
set(gca,'FontName','Microsoft YaHei','FontWeight','Bold','FontSize',14)
B与倍率的关系
C=[3 4 5 7];%倍率
B=[16437 14892 13795 12291];
B1=@(i)2.396e+04*abs(i).^(-0.343);
figure
plot(C,B,'*','linewidth',2)
hold on
fplot(@(x)B1(x),[0 11],'r','linewidth',2)
set(gca,'xtick',[0:1:11]);
set(gca,'ytick',[0:5000:40000]);
axis([0 10.5 10000 32001]);
set (gca,'position',[0.16,0.15,0.8,0.8] );
set(gca,'Fontsize',14);
xlabel('C','FontName','Microsoft YaHei','FontWeight','Bold','FontSize',15)
ylabel('B','FontName','Times New Roman','FontWeight','Bold','FontSize',15)
set(gca,'FontName','Microsoft YaHei','FontWeight','Bold','FontSize',14)
单纯倍率的模型参数
C=[3 4 5 7 ];
E=[30589 30218 29848 29107 ];
p1 = 0.7974
p2 = -14.35
p3 = -301.6
p4 = 3.165e+04
E1=@(x)p1*x^3+p2*x^2+p3*x+p4
figure
plot(C,E,'*','linewidth',2)
hold on
fplot(@(x)E1(x),[0 11],'r','linewidth',2)
set(gca,'xtick',[0:1:11]);
set(gca,'ytick',[0:1000:50000]);
axis([0 10.5 27000 32001]);
set (gca,'position',[0.16,0.15,0.8,0.8] );
set(gca,'Fontsize',14);
xlabel('C','FontName','Microsoft YaHei','FontWeight','Bold','FontSize',15)
ylabel('E(J/mol)','FontName','Times New Roman','FontWeight','Bold','FontSize',15)
set(gca,'FontName','Microsoft YaHei','FontWeight','Bold','FontSize',14)