Battery management apparatus and method
A battery management apparatus and method according to an embodiment of the present disclosure is directed to obtaining a positive electrode profile and a negative electrode profile for a battery cell in a non-destructive manner by appropriately adjusting a preset negative electrode profile. According to one aspect of the present disclosure, by using the battery profile and the adjusted negative electrode profile for the degraded battery cell, there is an advantage that the positive electrode profile of the degraded battery cell may be easily estimated in a non-destructive manner.
1 . A battery management apparatus, comprising:
a controller configured to:
select a first capacity region and a second capacity region in an entire capacity region of a battery profile of a battery cell,
determine a first reference peak and a second reference peak in a battery differential profile of the battery cell respectively in the first capacity region and the second capacity region, the battery differential profile representing a correspondence between a capacity value of the battery cell and a differential voltage value for the capacity value,
adjust a negative electrode differential profile of the battery cell so that a first target peak and a second target peak in the adjusted negative electrode differential profile correspond respectively to the determined first reference peak and the second reference peak in the battery differential profile, and
generate a positive electrode profile of the battery cell based on an adjusted negative electrode profile of the battery cell corresponding to the adjusted negative electrode differential profile and based on the battery profile,
wherein the first capacity region is within a range from the minimum capacity value in an entire capacity region of a negative electrode half-cell of the battery cell to 0.3 times a difference between the maximum capacity value and the minimum capacity value in the entire capacity region of the negative electrode half-cell, and the second capacity region is within a range from 0.4 times the difference between the maximum capacity value and the minimum capacity value to 0.6 times the difference between the maximum capacity value and the minimum capacity value.
2 . The battery management apparatus according to claim 1 ,
wherein the controller is further configured to have the first target peak at a same first capacity value as the first reference peak in the first capacity region and the second target peak at a same second capacity value as the second reference peak in the second capacity region.
3 . The battery management apparatus according to claim 2 ,
wherein the controller is further configured to adjust the negative electrode differential profile while changing an offset corresponding to a minimum capacity value of the negative electrode differential profile and a scale representing an entire capacity region of the negative electrode differential profile.
4 . The battery management apparatus according to claim 3 ,
wherein the controller is further configured to adjust the negative electrode profile to correspond to the adjusted negative electrode differential profile by applying change information of the offset and the scale for the adjusted negative electrode differential profile to the negative electrode profile.
5 . The battery management apparatus according to claim 1 ,
wherein the controller is further configured to generate the positive electrode profile by adding the voltage value of the battery profile and the voltage value of the adjusted negative electrode profile for each identical capacity value.
6 . The battery management apparatus according to claim 1 ,
wherein the controller is further configured to determine a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the first capacity region of the battery profile is 0 and whose differential voltage value is greatest as the first reference peak, and
wherein a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the second capacity region of the battery profile is 0 and whose differential voltage value is greatest as the second reference peak.
7 . The battery management apparatus according to claim 1 ,
wherein the negative electrode profile is a profile preset to represent a correspondence between the capacity value and a negative electrode voltage value of the battery cell, and
wherein the negative electrode differential profile is a profile preset to represent a correspondence between the capacity value and a differential negative electrode voltage value of the negative electrode voltage value for the capacity value.
8 . The battery management apparatus according to claim 1 ,
wherein the first capacity region and the second capacity region are preset not to overlap each other.
9 . The battery management apparatus according to claim 1 ,
wherein the battery profile represents a correspondence between a measured capacity value of the battery cell and a measured voltage value of the battery cell, and the differential voltage value is a differential of the measured voltage value of the battery cell with respect to the measured capacity value of the battery cell.
10 . A battery pack, comprising:
a battery management apparatus configured to:
select a first capacity region and a second capacity region in an entire capacity region of a battery profile of a battery cell,
determine a first reference peak and a second reference peak in a battery differential profile of the battery cell respectively in the first capacity region and the second capacity region, the battery differential profile representing a correspondence between a capacity value of the battery cell and a differential voltage value for the capacity value,
adjust a negative electrode differential profile of the battery cell so that a first target peak and a second target peak in the negative electrode differential profile correspond respectively to the determined first reference peak and the second reference peak in the battery differential profile, and
generate a positive electrode profile of the battery cell based on an adjusted negative electrode profile of the battery cell corresponding to the adjusted negative electrode differential profile and based on the battery profile,
wherein the first capacity region is within a range from the minimum capacity value in an entire capacity region of a negative electrode half-cell of the battery cell to 0.3 times a difference between the maximum capacity value and the minimum capacity value in the entire capacity region of the negative electrode half-cell, and the second capacity region is within a range from 0.4 times the difference between the maximum capacity value and the minimum capacity value to 0.6 times the difference between the maximum capacity value and the minimum capacity value.
11 . A battery management method, comprising:
selecting a first capacity region and a second capacity region in an entire capacity region of a battery profile of a battery cell;
determining a first reference peak and a second reference peak in a battery differential profile of the battery cell respectively in the first capacity region and the second capacity region, the battery differential profile representing a correspondence between a capacity value of the battery cell and a differential voltage value for the capacity value;
adjusting a negative electrode differential profile of the battery cell so that a first target peak and a second target peak in the negative electrode differential profile correspond respectively to the determined first reference peak and the second reference peak in the battery differential profile; and
generating a positive electrode profile of the battery cell based on an adjusted negative electrode profile of the battery cell corresponding to the adjusted negative electrode differential profile and based on the battery profile,
wherein the first capacity region is within a range from the minimum capacity value in an entire capacity region of a negative electrode half-cell of the battery cell to 0.3 times a difference between the maximum capacity value and the minimum capacity value in the entire capacity region of the negative electrode half-cell, and the second capacity region is within a range from 0.4 times the difference between the maximum capacity value and the minimum capacity value to 0.6 times the difference between the maximum capacity value and the minimum capacity value.
12 . The battery management method according to claim 11 , wherein:
the adjusting of the negative electrode differential profile includes adjusting the negative electrode differential profile to have the first target peak at a same first capacity value as the first reference peak in the first capacity region and the second target peak at a same second capacity value as the second reference peak in the second capacity region.
13 . The battery management method according to claim 12 ,
wherein the adjusting of the negative electrode differential profile includes adjusting the negative electrode differential profile while changing an offset corresponding to a minimum capacity value of the negative electrode differential profile and a scale representing an entire capacity region of the negative electrode differential profile.
14 . The battery management method according to claim 13 ,
wherein the adjusting of the negative electrode profile includes adjusting the negative electrode profile to correspond to the adjusted negative electrode differential profile by applying change information of the offset and the scale for the adjusted negative electrode differential profile to the negative electrode profile.
15 . The battery management method according to claim 11 ,
wherein the generating of the positive electrode profile includes generating the positive electrode profile by adding the voltage value of the battery profile and the voltage value of the adjusted negative electrode profile for each identical capacity value.
16 . The battery management method according to claim 11 , wherein the determining of the first reference peak and the second reference peak includes:
determining a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the first capacity region of the battery profile is 0 and whose differential voltage value is greatest as the first reference peak, and
determining a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the second capacity region of the battery profile is 0 and whose differential voltage value is greatest as the second reference peak.
17 . The battery management method according to claim 11 ,
wherein the negative electrode profile is a profile preset to represent a correspondence between the capacity value and a negative electrode voltage value of the battery cell, and
wherein the negative electrode differential profile is a profile preset to represent a correspondence between the capacity value and a differential negative electrode voltage value of the negative electrode voltage value for the capacity value.
18 . The battery management method according to claim 11 ,
wherein the first capacity region and the second capacity region are preset not to overlap each other.
19 . The battery management method according to claim 11 ,
wherein the battery profile represents a correspondence between a measured capacity value of the battery cell and a measured voltage value of the battery cell, and the differential voltage value is a differential of the measured voltage value of the battery cell with respect to the measured capacity value of the battery cell.