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EP-4737926-A1 - BATTERY MANAGEMENT SYSTEM AND BATTERY STATE OF HEALTH MANAGEMENT METHOD THEREFOR

EP4737926A1EP 4737926 A1EP4737926 A1EP 4737926A1EP-4737926-A1

Abstract

Provided is a battery SoH management method for a battery management system, comprising the steps of: checking the SOH of each of a plurality of battery modules included in a battery pack; on the basis of at least some of the respective SoHs of the plurality of battery modules, checking one or more first battery modules, which are at least some of the plurality of battery modules; and rechecking the SoH of the one or more first battery modules by considering at least a portion of the margin capacity of the one or more first battery modules as an available capacity.

Inventors

  • PARK, Myeonghui

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260506
Application Date
20250124

Claims (10)

  1. A battery State of Health (SoH) management method of a battery management system, the method comprising: identifying SoH of each of a plurality of battery modules included in a battery pack; identifying at least one first battery module of the plurality of battery modules, based on at least one of the SoH of each of the plurality of battery modules; and reconfirming SoH of the at least one first battery module by considering at least a portion of a margin capacity of the at least one first battery module as an available capacity.
  2. The method of claim 1, wherein the identifying the at least one first battery module comprises: confirming that at least one piece of difference information between the SoH of each of the plurality of battery modules is equal to or greater than a first threshold value, based on the at least one of the SoH of each of the plurality of battery modules; and identifying at least one battery module below a SoH among battery modules corresponding to each of the at least one piece of difference information that is equal to or greater than the first threshold value as the at least one first battery module.
  3. The method of claim 1, wherein the identifying the at least one first battery module comprises: confirming that at least one of the SoH of each of the plurality of battery modules is equal to or less than a second threshold value, based on the at least one of the SoH of each of the plurality of battery modules; and identifying at least one battery module corresponding to the SoH that is equal to or less than the second threshold value as the at least one first battery module.
  4. The method of claim 1, wherein the reconfirming SoH of the at least one first battery module comprises: identifying a first SoH corresponding to remaining battery modules, excluding the at least one first battery module, among the plurality of battery modules; identifying, based on the first SoH, at least a portion of a capacity to be considered as the available capacity, from the margin capacity; and reconfirming SoH of the at least one first battery module based on the at least the portion of the capacity to be considered as the available capacity.
  5. The method of claim 1, further comprising: confirming that at least one SoH of the plurality of battery modules is equal to or less than a second threshold value; confirming that a percentage of a margin capacity considered as an available capacity of at least one battery module corresponding to the SoH that is equal to or less than the second threshold value is equal to or greater than a third threshold value; and forwarding replacement information related to a replacement of the battery pack to an admin terminal.
  6. The method of claim 1, wherein the identifying the at least one first battery module comprises: confirming that at least one of the SoH of each of the plurality of battery modules is below a second threshold value; and confirming that at least one of remaining battery modules, excluding the at least one first battery module with SoH equal to or greater than the second threshold value, among the plurality of battery modules, is replaced with at least one second battery module.
  7. The method of claim 6, wherein the confirming that at least one of the SoH of the plurality of battery modules is below the second threshold value comprises forwarding replacement information related to a replacement of the at least one of the remaining battery modules to an admin terminal.
  8. The method of claim 6, wherein the reconfirming SoH of the at least one first battery module comprises: identifying a second SoH corresponding to the at least one second battery module; identifying, based on the second SoH, at least a portion of a capacity to be considered as the available capacity, from the margin capacity; and reconfirming SoH of the at least one first battery module based on the at least the portion of the capacity to be considered as the available capacity.
  9. A non-transitory computer-readable recording medium in which a program for executing a method of any one of claims 1 through 8 claim 1 is recorded.
  10. A battery management system for managing a battery State of Health (SoH), the system comprising: a processor; and a memory configured to store at least one instruction, wherein the processor is configured to: identify SoH of each of a plurality of battery modules included in a battery pack; identify at least one first battery module of the plurality of battery modules, based on at least one of the SoH of each of the plurality of battery modules; and reconfirm SoH of the at least one first battery module by considering at least a portion of a margin capacity of the at least one first battery module as an available capacity, by executing the at least one instruction.

Description

Technical Field This application claims priority to and benefit of Korean Patent Application No. 2024-0044649 filed on April 2, 2024 in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. The present disclosure relates to a battery management system and a battery State of Health (SoH) management method thereof. Background Art Generally, battery packs are manufactured to have a pack-module-cell hierarchical structure. More particularly, battery packs include a number of battery modules, and the battery modules may be configured to have a structure including a number of battery cells. In such a battery structure, State of Health (SoH) of the battery pack is estimated based on a battery module with the lowest SoH among battery modules the battery pack includes, and SoH of the battery module may also be estimated based on a battery cell with the lowest SoH among battery cells the battery module includes. The battery may be managed by a battery management system so that the battery may be used based on the estimated SoH. Such a SoH estimation method helps to maintain uniform performance of battery packs or modules, reduces the risk of overload or overcharging, and allows for lifespan optimization and better performance estimation. However, there are also disadvantages to the method, one of them being, in the case of an aged battery module being replaced with a new module, unable to fully utilize the performance of the new module as the SoH of the battery pack is determined based on states of health (SoHs) of the remaining modules that have not been replaced. In addition, when only some battery modules are aging more rapidly, there is a problem of using the battery pack based on the aged battery modules despite other battery modules being in their normal states, which leads to a waste of performance potential. Detailed Description of the Invention Technical Goals The present disclosure relates to a battery management system and a battery State of Health (SoH) management method thereof. More particularly, it is an object of the present disclosure to provide a battery SoH management method based on a margin capacity of a battery module or a battery cell. The goals to be achieved by example embodiments of the present disclosure are not limited to the objects described above, and other objects may be inferred from the following example embodiments. Technical Solutions According to an aspect, there is provided a battery State of Health (SoH) management method of a battery management system, the method may include identifying SoH of each of a plurality of battery modules included in a battery pack, identifying at least one first battery module of the plurality of battery modules, based on at least one of the SoH of each of the plurality of battery modules, and reconfirming SoH of the at least one first battery module by considering at least a portion of a margin capacity of the at least one first battery module as an available capacity. The identifying of the at least one first battery module may include confirming that at least one piece of difference information between the SoH of each of the plurality of battery modules is equal to or greater than a first threshold value, based on at least one of the SoH of each of the plurality of battery modules, and identifying at least one battery module with below a SoH among battery modules corresponding to each of the at least one piece of difference information that is equal to or greater than the first threshold value as the at least one first battery module. The identifying of the at least one first battery module may include confirming that at least one of the SoH of each of the plurality of battery modules is equal to or less than a second threshold value, based on the at least one of the SoH of each of the plurality of battery modules, and identifying at least one battery module corresponding to the SoH that is equal to or less than the second threshold value as the at least one first battery module. The reconfirming of the SoH of the at least one first battery module may include identifying a first SoH corresponding to remaining battery modules, excluding the at least one first battery module, among the plurality of battery modules, identifying, based on the first SoH, at least a portion of a capacity to be considered as the available capacity, from the margin capacity, and reconfirming SoH of the at least one first battery module based on the at least the portion of the capacity to be considered as the available capacity. According to an aspect, there is also provided a battery SoH management method, that may further include confirming that at least one SoH of the plurality of battery modules is equal to or less than a second threshold value, confirming that a percentage of a margin capacity considered as an available capacity of at least one battery module corresponding to the SoH that is equal to or less than t