Patent ID: 11929471
Assignee: ROLLS-ROYCE DEUTSCHLAND LTD & CO KG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. The method of claim 1, wherein the state of charge value is calculated based on the general relation, SOC
  =
  
   
    
     (
     
      1
      -
      
       
        1
        
         C
         [
         Ah
         ]
        
       
       ⁢
       
        ∫
        Idt
       
      
     
     )
    
    ·
    100
   
   ⁢
   %
  
 

wherein for a thermal network model represented by an electric equivalent circuitry, an equivalent time dependent differential equation system is defined by the relation, I
    2
   
   ⁢
   
    R
    ⁡
    (
    
     
      T
      i
     
     ,
     SOC
    
    )
   
   ⁢
   d
   ⁢
   t
  
  =
  
   
    C
    ⁢
    
     
      d
      ⁢
      
       T
       i
      
     
     
      d
      ⁢
      t
     
    
   
   +
   
    
     ∑
     
      i
      =
      0
     
     N
    
    
     
      ∑
      j
      
       j
       ≠
       i
      
     
     
      
       
        T
        i
       
       -
       
        T
        j
       
      
      
       R
       
        i
        ,
        j
       
      
     
    
   
  
 

wherein:
i is a location index value of a location of a single cell of the number of cells;
I is a current value of the set of currents at the location with the location index i and time t;
R(Ti, SOC) is a resistance at a temperature Ti and the state of charge value;
Ti, Tj is a respective temperature with a temperature value at the location with the location index value i;
SOC is a calculated state of charge value of the set of states; and
C is a capacity value according to the electric equivalent circuitry.