Method and apparatus for correcting error occurring in estimation of battery life

Abstract

An apparatus and method for correcting an error occurring in estimation of a life of a battery. Either one or both of usage information and battery environment information are collected, and a weight corresponding to the either one or both of the battery usage information and the battery environment information may be calculated from a battery degradation model. The calculated weight may be reflected on a state of health (SOH), and the SOH may be corrected.

What is claimed is: 
     
         1 . An battery state measuring apparatus, the apparatus comprising:
 one or more processors configured to:   generate battery degradation information based on battery usage information and battery environment information;   perform a first estimation of a state of health (SOH) of the battery; and   correct a result of the first estimation of the SOH to generate a second estimation of the SOH based on the battery degradation information.   
     
     
         2 . The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 calculate a weight corresponding to the either one or both of battery usage information and the battery environment information from the battery degradation information; and   correct the result of the first estimation of the SOH based on the weight.   
     
     
         3 . The apparatus of  claim 1 , wherein the battery degradation information comprises at least one of the battery usage information and the battery environment information used to reduce the life of the battery, and a degree of influence of the at least one of the battery usage information and the battery environment information on a reduction in a life of the battery. 
     
     
         4 . The apparatus of  claim 3 , wherein the one or more processors is further configured to:
 determine at least one normalized battery degradation information obtained by respectively normalizing a degradation in the battery by the at least one of the battery usage information and the battery environment information; and   calculate a weight corresponding to the either one or both of the battery usage information and the battery environment information based on the degree of influence and the at least one normalized battery degradation information, and correct the first estimation of the SOH based on the weight.   
     
     
         5 . The apparatus of  claim 1 , wherein the one or more processors is further configured to:
 accumulate periods of time in which the battery is degraded from the either one or both of the battery usage information and the battery environment information,   calculate a weight corresponding to the accumulated periods of time, and   correct the first estimation of the SOH based on the weight.   
     
     
         6 . The apparatus of  claim 1 , wherein the battery degradation information comprises:
 a factor corresponding to a degradation in the battery caused by a rapid discharge of the battery;   a factor corresponding to a degradation in the battery caused by a rapid charge of the battery;   a factor corresponding to a full charge of the battery; and   a factor corresponding to a degradation in the battery based on a period of time in which the battery is exposed to a predetermined temperature range.   
     
     
         7 . The apparatus of  claim 1 , wherein the battery usage information comprises any one or any combination of information associated with a rapid discharge of the battery, information associated with a rapid charge of the battery, and information associated with a full charge of the battery. 
     
     
         8 . The apparatus of  claim 1 , wherein the battery environment information comprises either one or both of information associated with a temperature to which the battery is exposed, and information associated with a period of time in which the battery is exposed to a predetermined temperature range. 
     
     
         9 . The apparatus of  claim 1 , wherein the one or more processors further configured to perform the first estimation of the SOH using a coulomb counting scheme. 
     
     
         10 . The apparatus of  claim 1 , wherein the battery is mounted in an electric vehicle. 
     
     
         11 . A processor implemented battery measuring method, the method comprising:
 generating battery degradation information based on battery usage information and battery environment information;   performing a first estimation of a state of health (SOH) of the battery; and   correcting a result of the first estimation of the SOH to generate a second estimation of the SOH based on the battery degradation information.   
     
     
         12 . The method of  claim 11 , wherein the correcting comprises:
 calculating a weight corresponding to the either one or both of the battery usage information and the battery environment information from the battery degradation information; and   correcting the result of the first estimation of the SOH based on the weight.   
     
     
         13 . The method of  claim 11 , wherein the battery degradation information comprises at least one of the battery usage information and the battery environment information used to reduce the life of the battery, and a degree of influence of the at least one of the battery usage information and the battery environment information on a reduction in the life of the battery. 
     
     
         14 . The method of  claim 13 , further comprising determining at least one normalized battery degradation information obtained by respectively normalizing a degradation in the battery by the at least one of the battery usage information and the battery environment information;
 wherein the correcting comprises:
 calculating a weight corresponding to either one or both of the battery usage information and the battery environment information based on the degree of influence and the at least one normalized battery degradation information; and 
 correcting the first estimation of the SOH based on the weight. 
   
     
     
         15 . The method of  claim 11 , wherein the correcting comprises:
 accumulating periods of time in which the battery is degraded from the either one or both of the battery usage information and the battery environment information;   calculating a weight corresponding to the accumulated periods of time; and   correcting the first estimation of the SOH based on the weight.   
     
     
         16 . The method of  claim 11 , wherein the battery degradation information comprises:
 a factor corresponding to a degradation in the battery caused by a rapid discharge of the battery;   a factor corresponding to a degradation in the battery caused by a rapid charge of the battery;   a factor corresponding to a full charge of the battery; and   a factor corresponding to a degradation in the battery based on a period of time in which the battery is exposed to a predetermined temperature range.   
     
     
         17 . The method of  claim 11 , wherein the battery usage information comprises any one or any combination of information associated with a rapid discharge of the battery, information associated with a rapid charge of the battery, and information associated with a full charge of the battery. 
     
     
         18 . The method of  claim 11 , wherein the battery environment information comprises either one or both of information associated with a temperature to which the battery is exposed, and information associated with a period of time in which the battery is exposed to a predetermined temperature range. 
     
     
         19 . The method of  claim 11 , wherein the performing comprises performing the first estimation of the SOH using a coulomb counting scheme. 
     
     
         20 . The apparatus of  claim 1 , wherein the apparatus is a battery management system. 
     
     
         21 . The apparatus of  claim 20 , wherein the battery management system is configured to indicate to a user to change the battery when a determined SOH of the battery, based on the second estimation of the SOH, falls below a predetermined threshold.