Patent ID: 11971457
Assignee: TONGJI UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. The method for measuring AC impedance of a battery in a composite power supply power system according to claim 5, wherein in said step S3 and step S4, a formula for calculating the impedance of the fuel cell, an impedance of the single cells to be measured in the fuel cell, the impedance of the lithium battery and an impedance of the single cells to be measured in the lithium battery are specifically:, Z
      ⁡
      
        (
        ω
        )
      
    
    =
    
      
        
          V
          A
        
        
          I
          A
        
      
      ⁢
      
        e
        
          j
          ⁡
          
            (
            
              
                θ
                1
              
              -
              
                θ
                2
              
            
            )
          
        
      
    
  

  
    
      V
      ⁡
      
        (
        t
        )
      
    
    =
    
      
        V
        D
      
      +
      
        
          V
          A
        
        ⁢
        sin
        ⁢
        
          
        
        ⁢
        
          (
          
            
              ω
              ⁢
              
                
              
              ⁢
              t
            
            +
            
              θ
              1
            
          
          )
        
      
    
  

  
    
      I
      ⁡
      
        (
        t
        )
      
    
    =
    
      
        I
        D
      
      +
      
        
          I
          A
        
        ⁢
        sin
        ⁢
        
          
        
        ⁢
        
          (
          
            
              ω
              ⁢
              
                
              
              ⁢
              t
            
            +
            
              θ
              2
            
          
          )
        
      
    
  

wherein, Z(ω) represents the impedance, V(t) represents a collected voltage signal, VD represents a DC voltage signal in the collected voltage signal, VA represents an AC voltage signal in the collected voltage signal, I(t) represents a collected current signal, ID represents a DC current signal in the collected current signal, IA represents an AC current signal in the collected current signal, ω represents a frequency of the AC voltage signal and a frequency of the AC current signal, t represents a time, and θ1 and θ2 represent an initial phase of the AC voltage signal and an initial phase of the AC current signal, respectively.