Estimating apparatus and method of input and output enabling powers for secondary cell

US 20040169495A1
Filed: 02/10/2004
Published: 09/02/2004
Est. Priority Date: 02/28/2003
Status: Active Grant

First Claim

Patent Images

1. An estimating apparatus for a secondary cell, comprising:

a current detecting section that detects a current (I) charged into and discharged from the secondary cell;

a voltage detecting section that detects a terminal voltage (V) across the secondary cell;

a parameter estimating section that integrally estimates all parameters (θ

) at one time in at least one of the following equations (1) and (2) with the measured current (I) and terminal voltage (V) inputted into an adaptive digital filter using a cell model described in a corresponding one of the following equations (1) and (2) whose parameters are estimated;

an open-circuit voltage calculating section that calculates an open-circuit voltage (Vo) using the current (I), the terminal voltage (V), and the parameter estimated values (θ

);

an input enabling power estimating section that estimates an input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ

) and open-circuit voltage (Vo); and

an output enabling power estimating section that estimates an output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values and the open-circuit voltage (Vo), the equation (1) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{C (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k}, B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k}, C (s) = \sum_{k = 0}^{n} c_{k} \cdot s^{k}, & (1) \end{matrix}$

s denotes a Laplace transform operator, A(s), B(s), and C(s) denote each poly-nominal of s (n denotes degrees), a₁≠

0, b₁≠

0, and c₁≠

0 and the equation (2) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{A (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k} and B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k} . & (2) \end{matrix}$

View all claims

1 Assignment

Timeline View

Assignment View

0 Petitions

Accused Products

Abstract

In input and output enabling power estimating apparatus and method for a secondary cell, an input enabling power (P_in) of the secondary cell is estimated on the basis of parameter estimated values (θ) and an open-circuit voltage (Vo), and an output enabling power (P_out) of the secondary cell is estimated on the basis of the parameter estimated values and the open-circuit voltage (Vo), the parameters are integrally estimated from at least one of equations (1) and (2): $\begin{matrix} V = \frac{B (s)}{A (s)} • I + \frac{1}{C (s)} • Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} • s^{k}, B (s) = \sum_{k = 0}^{n} b_{k} • s^{k}, C (s) = \sum_{k = 0}^{n} c_{k} • s^{k}, & (1) \end{matrix}$

s denotes a Laplace transform operator, A(s), B(s), and C(s) denote each poly-nominal of s (n denotes degrees), a₁≠0, b₁≠0, and c₁≠0 and $\begin{matrix} V = \frac{B (s)}{A (s)} • I + \frac{1}{A (s)} • Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} • s^{k} and B (s) = \sum_{k = 0}^{n} b_{k} • s^{k} . & (2) \end{matrix}$

16 Citations

View as Search Results

20 Claims

1. An estimating apparatus for a secondary cell, comprising:
- a current detecting section that detects a current (I) charged into and discharged from the secondary cell;
  
  a voltage detecting section that detects a terminal voltage (V) across the secondary cell;
  
  a parameter estimating section that integrally estimates all parameters (θ
  
  ) at one time in at least one of the following equations (1) and (2) with the measured current (I) and terminal voltage (V) inputted into an adaptive digital filter using a cell model described in a corresponding one of the following equations (1) and (2) whose parameters are estimated;
  
  an open-circuit voltage calculating section that calculates an open-circuit voltage (Vo) using the current (I), the terminal voltage (V), and the parameter estimated values (θ
  
  );
  
  an input enabling power estimating section that estimates an input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ
  
  ) and open-circuit voltage (Vo); and
  
  an output enabling power estimating section that estimates an output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values and the open-circuit voltage (Vo), the equation (1) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{C (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k}, B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k}, C (s) = \sum_{k = 0}^{n} c_{k} \cdot s^{k}, & (1) \end{matrix}$
  
  s denotes a Laplace transform operator, A(s), B(s), and C(s) denote each poly-nominal of s (n denotes degrees), a₁≠
  
  0, b₁≠
  
  0, and c₁≠
  
  0 and the equation (2) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{A (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k} and B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k} . & (2) \end{matrix}$
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- - 2. An estimating apparatus for a secondary cell as claimed in claim 1, wherein the adaptive digital filter uses the cell model described in the equation (1) and the parameter estimating section integrally estimates all of the parameters (θ
    - ) in the equation (1) at one time and wherein, in a case where the terminal voltage of the secondary cell immediately before the secondary cell becomes a predetermined excessive charge is assumed to be a maximum enabling voltage (V_max) and the terminal voltage of the secondary cell immediately before the secondary cell becomes a predetermined excessive discharge is assumed to be a minimum enabling voltage (V_min), the input enabling power estimating section estimates the input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ
      
      ), the open-circuit voltage (Vo), and the maximum enabling voltage (V_max) and the output enabling power estimating section estimates the output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values (θ
      
      ), the open-circuit voltage (Vo), and the minimum enabling voltage (V_min).
  - 3. An estimating apparatus for a secondary cell as claimed in claim 2, wherein the input enabling power estimating section calculates Vo/C(s) from the parameter estimated values and the open-circuit voltage (Vo) and the input enabling power estimating section estimates the input enabling power (P_in) of the secondary cell on the basis of one of the open-circuit voltage (Vo) and the calculated (Vo/C(s)) whose value is nearer to the maximum enabling voltage (V_max), the parameter estimated values (θ
    - ), and the minimum enabling voltage (V_min).
  - 4. An estimating apparatus for a secondary cell as claimed in claim 2, wherein the output enabling power estimating section calculates Vo/C(s) from the parameter estimated values (θ
    - ) and the open-circuit voltage (Vo) and the output enabling power estimating section estimates the output enabling power (P_out) of the secondary cell on the basis of one of the open-circuit voltage (Vo) and the calculated Vo/C(s) whose value is nearer to the minimum enabling voltage (V_min), the parameter estimated values (θ
      
      ), and the maximum output enabling voltage (V_max).
  - 5. An estimating apparatus for a secondary cell as claimed in claim 2, wherein the input enabling power estimating section calculates Vo/C(s) from the parameter estimated values (θ
    - ) and the open-circuit voltage (Vo) and estimates the input enabling power (P_in) of the secondary cell on the basis of one of the open-circuit voltage (Vo) and the calculated Vo/C(s) whose value is nearer to the maximum enabling voltage (V_max), the parameter estimated values (θ
      
      ), and the maximum enabling voltage (V_max) and wherein the output enabling power estimating section estimates the output enabling power (P_out) of the secondary cell on the basis of one of the open-circuit voltage (Vo) and the calculated Vo/C(s) whose value is nearer to the minimum enabling voltage (V_min).
  - 6. An estimating apparatus for a secondary cell as claimed in claim 5, wherein the input enabling power estimating section estimates the input enabling power (P_in) using the following equation:
  - 7. An estimating apparatus for a secondary cell as claimed in claim 6, wherein the output enabling power estimating section estimates the output enabling power (P_out) using the following equation:
  - 8. An estimating apparatus for a secondary cell as claimed in claim 7, wherein
  - 9. An estimating apparatus for a secondary cell as claimed in claim 8, wherein the open-circuit voltage (Vo(k)) at the time point of k is estimated from the following equation:
  - 10. An estimating apparatus for a secondary cell as claimed in claim 9, wherein the parameter estimating section integrally estimates the parameters used in the equation (1) at one time as follows:
  - 11. An estimating apparatus for a secondary cell as claimed in claim 10, wherein the equation (1) is arranged in an equivalent circuit model expressed as:
  - 12. An estimating apparatus for a secondary cell as claimed in claim 1, wherein the adaptive digital filter uses the cell model described in the equation (2) and the parameter estimating section integrally estimates all parameters (θ
    - ) in the equation (2) at one time.
  - 13. An estimating apparatus for a secondary cell as claimed in claim 12, wherein, in a case where the terminal voltage of the secondary cell immediately before the secondary cell becomes a predetermined excessive charge is assumed to be a maximum enabling voltage (V_max) and the terminal voltage of the secondary cell immediately before the secondary cell becomes a predetermined excessive discharge is assumed to be a minimum enabling voltage (V_min), the input enabling power estimating section estimates the input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ
    - ) and the open-circuit voltage (Vo), and the maximum enabling voltage (V_max) and the output enabling power estimating section estimates the output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values (θ
      
      ), the open-circuit voltage (Vo), and the minimum enabling voltage (V_min).
  - 14. An estimating apparatus for a secondary cell as claimed in claim 13, wherein the input enabling power estimating section estimates the input enabling power (P_in) using the following equation:
  - 15. An estimating apparatus for a secondary cell as claimed in claim 14, wherein the output enabling power estimating section estimates the output enabling power (P_out) as follows:
  - 16. An estimating apparatus for a secondary cell as claimed in claim 15, wherein the open-circuit voltage calculating section calculates the open-circuit voltage estimated value (V₀(k)) at a time point of k as follows:
    - V₀(k)=Δ
      
      V₀(k)+V_—_ⁱⁿⁱ, wherein V_—_ⁱⁿⁱdenotes an initial value of the terminal voltage when no current is caused to flow into the secondary cell and Δ
      
      V₀(k)=Δ
      
      V₀=G_1p(s)·
      
      V₀=V₁+T₁·
      
      V₂−
      
      K·
      
      T₂·
      
      I₂−
      
      K·
      
      I₁wherein
  - 17. An estimating apparatus for a secondary cell as claimed in claim 16, wherein the parameter estimating section integrally estimates all parameters used in the equation (2) at one time as follows:
  - 18. An estimating apparatus for a secondary cell as claimed in claim 16, wherein, in the equation (2), when (T₁·
    - s+1) is substituted for A(s) and K·
      
      (T₂·
      
      S+1) is substituted for B(s), the following equation is established;
      
      .

19. An estimating apparatus for a secondary cell, comprising:
- current detecting means for detecting a current (I) charged into and discharged from the secondary cell;
  
  voltage detecting means for detecting a terminal voltage (V) across the secondary cell;
  
  parameter estimating means for integrally estimating all parameters (θ
  
  ) at one time in at least one of the following equations (1) and (2) with the measured current (I) and terminal voltage (V) inputted into an adaptive digital filter using a cell model described in a corresponding one of the following equations (1) and (2) whose parameters are estimated;
  
  open-circuit voltage calculating means for calculating an open-circuit voltage (Vo) using the current (I), the terminal voltage (V), and the parameter estimated values (θ
  
  );
  
  input enabling power estimating means for estimating an input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ
  
  ) and open-circuit voltage (Vo); and
  
  output power enabling power estimating means for estimating an output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values and the open-circuit voltage (Vo), the equation (1) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{C (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k}, B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k}, C (s) = \sum_{k = 0}^{n} c_{k} \cdot s^{k}, & (1) \end{matrix}$
  
  s denotes a Laplace transform operator, A(s), B(s), and C(s) denote each poly-nominal of s (n denotes degrees), a₁≠
  
  0, b₁≠
  
  0, and c₁≠
  
  0 and the equation (2) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{A (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k} and B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k} . & (2) \end{matrix}$

20. An estimating method for a secondary cell, comprising:
- detecting a current (I) charged into and discharged from the secondary cell;
  
  detecting a terminal voltage (V) across the secondary cell;
  
  integrally estimating all parameters (θ
  
  ) at one time in at least one of the following equations (1) and (2) with the measured current (I) and terminal voltage (V) inputted into an adaptive digital filter using a cell model described in a corresponding one of the following equations (1) and (2) whose parameters are estimated;
  
  calculating an open-circuit voltage (Vo) using the current (I), the terminal voltage (V), and the parameter estimated values (θ
  
  );
  
  estimating an input enabling power (P_in) of the secondary cell on the basis of the parameter estimated values (θ
  
  ) and open-circuit voltage (Vo); and
  
  estimating an output enabling power (P_out) of the secondary cell on the basis of the parameter estimated values and the open-circuit voltage (Vo), the equation (1) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{C (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k}, B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k}, C (s) = \sum_{k = 0}^{n} c_{k} \cdot s^{k}, & (1) \end{matrix}$
  
  s denotes a Laplace transform operator, A(s), B(s), and C(s) denote each poly-nominal of s (n denotes degrees), a₁≠
  
  0, b₁≠
  
  0, and c₁≠
  
  0 and the equation (2) being $\begin{matrix} V = \frac{B (s)}{A (s)} \cdot I + \frac{1}{A (s)} \cdot Vo, wherein A (s) = \sum_{k = 0}^{n} a_{k} \cdot s^{k} and B (s) = \sum_{k = 0}^{n} b_{k} \cdot s^{k} . & (2) \end{matrix}$

Specification

Resources

Litigation Campaign Assessment

Current Assignee
Nissan Motor Co., Ltd.
Original Assignee
Nissan Motor Co., Ltd.
Inventors
Nakamura, Hideo, Yumoto, Daijiro

Granted Patent

US 7,009,402 B2
Time in Patent Office

Days
Field of Search
US Class Current

320/132
CPC Class Codes

B60L 2240/545   Temperature

B60L 2240/547   Voltage

B60L 2240/549   Current

B60L 2260/44   by parameter estimation

B60L 3/12   Recording operating variabl...

B60L 58/12   responding to state of char...

B60L 58/21   having the same nominal vol...

B60L 7/10   Dynamic electric regenerati...

G01R 31/36   Arrangements for testing, m...

Y02T 10/70   Energy storage systems for ...

Estimating apparatus and method of input and output enabling powers for secondary cell

First Claim

1 Assignment

0 Petitions

Accused Products

Abstract

16 Citations

20 Claims

Specification

Solutions

Use Cases

Quick Links

Estimating apparatus and method of input and output enabling powers for secondary cell

First Claim

1 Assignment

Subscription Required

Subscription Required

0 Petitions

Subscription Required

Accused Products

Subscription Required

Abstract

16 Citations

20 Claims

Specification

Subscription Required

Solutions

Use Cases

Quick Links