Battery control method and system, smart battery, and movable platform

Abstract

A method for controlling a battery includes obtaining a present status parameter of the battery, and determining, according to the present status parameter, a discharge protection parameter. Status parameters within different ranges correspond to different discharge protection parameters. The discharge protection operation includes an under voltage protection. The method further includes determining, according to the discharge protection parameter and the present status parameter of the battery, whether to perform the discharge protection operation on the battery, and in response to determining to perform the discharge protection operation, performing the under voltage protection on the battery by disconnecting a discharge circuit for a load from the battery.

What is claimed is: 
     
         1 . A method for controlling a battery comprising:
 obtaining a present status parameter of the battery;   determining, according to the present status parameter, a discharge protection parameter, status parameters within different ranges corresponding to different discharge protection parameters, and the discharge protection operation including an under voltage protection;   determining, according to the discharge protection parameter and the present status parameter of the battery, whether to perform the discharge protection operation on the battery; and   in response to determining to perform the discharge protection operation, performing the under voltage protection on the battery by disconnecting a discharge circuit for a load from the battery.   
     
     
         2 . The method according to  claim 1 , wherein the present status parameter includes at least one of a discharge electrical current of the battery, a temperature of the battery, an internal resistance of the battery, a number of times of discharge of the battery, or a state of health of a battery core of the battery. 
     
     
         3 . The method according to  claim 2 , wherein:
 the present status parameter includes the discharge electrical current of the battery, and   the discharge protection parameter is configured to remain constant in response to the discharge electrical current being greater than a preset current threshold.   
     
     
         4 . The method according to  claim 2 , wherein:
 the present status parameter includes the temperature of the battery, and   the discharge protection parameter is configured to remain constant in response to the temperature of the battery being less than a preset temperature.   
     
     
         5 . The method according to  claim 2 , wherein:
 the present status parameter includes the discharge electrical current and the temperature of the battery; and   the discharge protection parameter is configured to:
 remain constant in response to the discharge electrical current being greater than a preset electrical current threshold or the temperature of the battery being less than a preset temperature; 
 change as the temperature of the battery changes in response to the discharge electrical current being less than the preset current threshold; and 
 change as the discharge electrical current changes in response to the temperature of the battery being greater than the preset temperature. 
   
     
     
         6 . The method according to  claim 1 , wherein the discharge protection parameter includes a discharge cut-off voltage. 
     
     
         7 . The method according to  claim 6 , wherein:
 the discharge protection parameter further includes a longest sustainable time duration for the battery being discharged at the discharge cut-off voltage, and   the longest sustainable time duration is inversely proportional to the discharge cut-off voltage.   
     
     
         8 . The method according to  claim 1 ,
 wherein:
 the present status parameter is one of one or more present status parameters of the battery, and the discharge protection parameter is one of one or more discharge protection parameters each corresponding to one of the one or more present status parameters; and 
 each of the one or more discharge protection parameters includes a discharge cut-off voltages; 
   the method further comprising:
 obtaining one or more continuous discharge time durations in a discharge cycle of the battery, each of the one or more continuous discharge time durations being a time duration during which the battery is discharged at the discharge cut-off voltage of one of the one or more discharge protection parameters; 
 accumulating the one or more continuous discharge time durations to obtain an accumulated discharge time duration; and 
 determining whether to perform the discharge protection operation further according to the accumulated discharge time duration. 
   
     
     
         9 . The method according to  claim 8 , wherein accumulating the one or more continuous discharge time durations includes:
 modifying the one or more continuous discharge time durations using one or more modification factors each corresponding to one of the one or more discharge cut-off voltages to obtain one or more modified continuous discharge time durations; and   accumulating the one or more modified continuous discharge time durations to obtain the accumulated discharge time duration.   
     
     
         10 . The method according to  claim 9 , wherein:
 modifying the one or more continuous discharge time durations using the one or more modification factors includes, for each one continuous discharge time duration of the one or more continuous discharge time durations:
 calculating a common multiple of one or more longest sustainable time durations corresponding to the one or more discharge cut-off voltages and a quotient of the common multiple over the longest sustainable time duration corresponding to one of the one or more discharge cut-off voltages at which the battery is discharged during the one continuous discharge time duration; and 
 weighting the one continuous discharge time duration using the quotient as a weight to obtain the modified continuous discharge time duration corresponding to the one continuous discharge time duration; and 
   accumulating the one or more modified continuous discharge time durations includes obtaining a summation result of the modified continuous discharge time durations.   
     
     
         11 . The method according to  claim 10 , wherein determining whether to perform the discharge protection operation includes:
 comparing the summation result with the common multiple; and   performing the discharge protection operation in response to the summation result being larger than the common multiple.   
     
     
         12 . A system for controlling a battery, comprising a processor configured to:
 obtain a present status parameter of the battery;   determine, according to the present status parameter, a discharge protection parameter, status parameters within different ranges being correspond to different discharge protection parameters, and the discharge protection operation including an under voltage protection;   determine, according to the discharge protection parameter and the present status parameter of the battery, whether to perform the discharge protection operation on the battery; and   in response to determining to perform the discharge protection operation, perform the under voltage protection on the battery by disconnecting a discharge circuit for a load from the battery.   
     
     
         13 . The system according to  claim 12 , further comprising:
 a detection apparatus coupled to the processor and configured to detect the present status parameter of the battery and transmit the present status parameter to the processor.   
     
     
         14 . The system according to  claim 12 , wherein:
 the present status parameter includes at least one of a discharge electrical current of the battery, a temperature of the battery, an internal resistance of the battery, a number of times of discharges of the battery, or a state of health of a battery core of the battery.   
     
     
         15 . The system according to  claim 12 , wherein:
 the discharge protection parameter includes at least one of a discharge cut-off voltage or a longest sustainable time duration for the battery being discharged at the discharge cut-off voltage; and   the longest sustainable time duration is inversely proportional to the discharge cut-off voltage.   
     
     
         16 . The system according to  claim 12 , wherein:
 the present status parameter is one of one or more present status parameters of the battery, and the discharge protection parameter is one of one or more discharge protection parameters each corresponding to one of the one or more present status parameters; and   each of the one or more discharge protection parameters includes a discharge cut-off voltages;   the processor is further configured to:
 obtain one or more continuous discharge time durations in a discharge cycle of the battery, each of the one or more continuous discharge time durations being a time duration during which the battery is discharged at the discharge cut-off voltage of one of the one or more discharge protection parameters; 
 accumulate the one or more continuous discharge time durations to obtain an accumulated discharge time duration; and 
 determine whether to perform the discharge protection operation further according to the accumulated discharge time duration. 
   
     
     
         17 . The system according to  claim 16 , wherein the processor is further configured to:
 modify the one or more continuous discharge time durations using one or more modification factors each corresponding to one of the one or more discharge cut-off voltages to obtain one or more modified continuous discharge time durations; and   accumulate the one or more modified continuous discharge time durations to obtain the accumulated discharge time duration.   
     
     
         18 . The system according to  claim 17 , wherein the processor is further configured to:
 calculate a common multiple of one or more longest sustainable time durations corresponding to the one or more discharge cut-off voltages and a quotient of the common multiple over the longest sustainable time duration corresponding to one of the one or more discharge cut-off voltages at which the battery is discharged during the one continuous discharge time duration; and   weight the one continuous discharge time duration using the quotient as a weight to obtain the modified continuous discharge time duration corresponding to the one continuous discharge time duration;   obtain a summation result of the modified continuous discharge time durations;   compare the summation result with the common multiple; and   perform the discharge protection operation in response to the summation result being larger than the common multiple.   
     
     
         19 . A smart battery comprising:
 a control circuit; and   one or more energy storage units electrically coupled to the control circuit and configured to provide electricity through the control circuit;   wherein the control circuit is configured to:
 determine, according to a present status parameter of the one or more energy storage units, a discharge protection parameter, status parameters within different ranges being correspond to different discharge protection parameters, and the discharge protection operation including an under voltage protection; 
 determine whether to perform the discharge protection operation on the one or more energy storage units according to the discharge protection parameter and the present status parameter of the one or more energy storage units; and 
 in response to determining to perform the discharge protection operation, perform the under voltage protection on the one or more energy storage units by disconnecting a discharge circuit for a load from the battery. 
   
     
     
         20 . The smart battery according to  claim 19 , wherein one of the one or more energy storage units includes a battery core.