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EP-4468004-B1 - BATTERY MANAGEMENT APPARATUS AND METHOD

EP4468004B1EP 4468004 B1EP4468004 B1EP 4468004B1EP-4468004-B1

Inventors

  • CHOI, Soon-Hyung
  • YOON, SEO-YOUNG
  • KIM, DAE-SOO

Dates

Publication Date
20260513
Application Date
20231226

Claims (11)

  1. A battery management apparatus (100), comprising: a profile obtaining unit (110) configured to obtain a measurement full-cell profile representing the corresponding relationship between voltage and capacity of a battery; a profile determining unit (120) configured to divide at least one of a preset reference positive electrode profile and a reference negative electrode profile into a plurality of electrode sections, adjust the reference positive electrode profile and the reference negative electrode profile to correspond to the measurement full-cell profile while adjusting each of the plurality of electrode sections, and generate an adjustment positive electrode profile and an adjustment negative electrode profile according to the adjustment result; and a control unit (130) configured to determine a diagnostic factor for the battery from at least one of the adjustment positive electrode profile and the adjustment negative electrode profile.
  2. The battery management apparatus (100) according to claim 1, wherein the profile obtaining unit (110) is configured to obtain at least one of a positive electrode differential profile corresponding to the reference positive electrode profile and a negative electrode differential profile corresponding to the reference negative electrode profile as an electrode differential profile.
  3. The battery management apparatus (100) according to claim 2, wherein when the positive electrode differential profile is included in the electrode differential profile, the profile determining unit (120) is configured to divide the reference positive electrode profile into a plurality of positive electrode sections based on at least one of a plurality of positive electrode peaks included in the positive electrode differential profile.
  4. The battery management apparatus (100) according to claim 2, wherein when the negative electrode differential profile is included in the electrode differential profile, the profile determining unit (120) is configured to divide the reference negative electrode profile into a plurality of negative electrode sections based on at least one of a plurality of negative electrode peaks included in the negative electrode differential profile.
  5. The battery management apparatus (100) according to claim 1, wherein the profile determining unit (120) is configured to independently adjust each of the plurality of electrode sections.
  6. The battery management apparatus (100) according to claim 1, wherein the control unit (130) is configured to determine a positive electrode factor included in the diagnostic factor based on the adjustment positive electrode profile and determine a negative electrode factor included in the diagnostic factor based on the adjustment negative electrode profile.
  7. The battery management apparatus (100) according to claim 6, wherein the control unit (130) is configured to: determine a positive electrode participation start point and a positive electrode participation end point of the adjustment positive electrode profile as the positive electrode factor, when the reference positive electrode profile is not divided into a plurality of positive electrode sections, further determine a positive electrode change rate, which represents a change rate of the adjustment positive electrode profile with respect to the reference positive electrode profile, as the positive electrode factor, and when the reference positive electrode profile is divided into the plurality of positive electrode sections, further determine the positive electrode change rate for each of the plurality of positive electrode sections as the positive electrode factor.
  8. The battery management apparatus (100) according to claim 6, wherein the control unit (130) is configured to: determine a negative electrode participation start point and a negative electrode participation end point of the adjustment negative electrode profile as the negative electrode factor, when the reference negative electrode profile is not divided into a plurality of negative electrode sections, further determine a negative electrode change rate, which represents a change rate of the adjustment negative electrode profile with respect to the reference negative electrode profile, as the negative electrode factor, and when the reference negative electrode profile is divided into the plurality of negative electrode sections, further determine the negative electrode change rate for each of the plurality of negative electrode sections as the negative electrode factor.
  9. A battery pack, comprising the battery management apparatus (100) according to any one of claims 1 to 8.
  10. A vehicle, comprising the battery management apparatus (100) according to any one of claims 1 to 8.
  11. A battery management method, performed by a battery management apparatus (100), the battery management method comprising: a profile obtaining step (S100) of obtaining a measurement full-cell profile representing the corresponding relationship between voltage and capacity of a battery; a profile adjusting step (S200) of dividing at least one of a preset reference positive electrode profile and a reference negative electrode profile into a plurality of electrode sections and adjusting the reference positive electrode profile and the reference negative electrode profile to correspond to the measurement full-cell profile while adjusting each of the plurality of electrode sections; a profile generating step (S300) of generating an adjustment positive electrode profile and an adjustment negative electrode profile according to the adjustment result; and a factor determining step (S400) of determining a diagnostic factor for the battery from at least one of the adjustment positive electrode profile and the adjustment negative electrode profile.

Description

TECHNICAL FIELD The present disclosure relates to a battery management apparatus and method, and more particularly, to a battery management apparatus and method for estimating a positive electrode profile and a negative electrode profile for a battery. BACKGROUND ART Recently, the demand for portable electronic products such as notebook computers, video cameras and portable telephones has increased sharply, and electric vehicles, energy storage batteries, robots, satellites and the like have been developed in earnest. Accordingly, high-performance batteries allowing repeated charging and discharging are being actively studied. Batteries commercially available at present include nickel-cadmium batteries, nickel hydrogen batteries, nickel-zinc batteries, lithium batteries and the like. Among them, the lithium batteries are in the limelight since they have almost no memory effect compared to nickel-based batteries and also have very low self-charging rate and high energy density. A lot of research is being done on these batteries in terms of increasing capacity and density, but improving lifespan and safety is also important. In order to improve battery safety, the current state of the battery must be accurately diagnosed. In order to most accurately diagnose the current state of the battery, the positive electrode profile and negative electrode profile of the battery must be secured and analyzed separately. However, since disassembly and assembly of the manufactured battery are virtually impossible, there is a problem that it is impossible to directly measure the positive electrode profile and negative electrode profile of the manufactured battery. Therefore, in order to more accurately diagnose the state of the battery, technology is required to accurately estimate the positive electrode profile and negative electrode profile corresponding to the battery. WO 2022/035032 A1 discloses a battery management device and method capable of obtaining a positive electrode profile and a negative electrode profile for a battery cell in a non-destructive manner by appropriately adjusting a preconfigured negative electrode profile. According to an aspect of the disclosure, an adjusted negative electrode profile and a battery profile for a degraded battery cell are used, so that a positive electrode profile of a degraded battery cell can be easily estimated in a non-destructive manner. SUMMMARY Technical Problem The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a battery management apparatus and method capable of accurately estimating a positive electrode profile and a negative electrode profile corresponding to a battery. These and other objects and advantages of the present disclosure may be understood from the following detailed description and will become more fully apparent from the exemplary embodiments of the present disclosure. Also, it will be easily understood that the objects and advantages of the present disclosure may be realized by the means shown in the appended claims and combinations thereof. Technical Solution The invention is defined by the independent claims. Advantageous embodiments are subject to the dependent claims. A battery management apparatus according to one aspect of the present disclosure comprises: a profile obtaining unit configured to obtain a measurement full-cell profile representing the corresponding relationship between voltage and capacity of a battery; a profile determining unit configured to divide at least one of a preset reference positive electrode profile and a reference negative electrode profile into a plurality of electrode sections, adjust the reference positive electrode profile and the reference negative electrode profile to correspond to the measurement full-cell profile while adjusting each of the plurality of electrode sections, and generate an adjustment positive electrode profile and an adjustment negative electrode profile according to the adjustment result; and a control unit configured to determine a diagnostic factor for the battery from at least one of the adjustment positive electrode profile and the adjustment negative electrode profile. The profile obtaining unit may be configured to obtain at least one of a positive electrode differential profile corresponding to the reference positive electrode profile and a negative electrode differential profile corresponding to the reference negative electrode profile as an electrode differential profile. When the positive electrode differential profile is included in the electrode differential profile, the profile determining unit may be configured to divide the reference positive electrode profile into a plurality of positive electrode sections based on at least one of a plurality of positive electrode peaks included in the positive electrode differential profile. When the negative electrode differential profile is included in the e