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KR-102962100-B1 - Apparatus for management of a battery, vehicle system having the same and method thereof

KR102962100B1KR 102962100 B1KR102962100 B1KR 102962100B1KR-102962100-B1

Abstract

The present invention relates to a battery management device, a vehicle system including the same, and a method thereof. A battery management device according to an embodiment of the present invention may include: a processor that generates a profile based on the voltage of a battery cell during battery charging, determines the uniformity of the battery cell based on the profile, and performs management and control of the battery using the uniformity; and a storage unit that stores a profile for each battery cell, an algorithm driven by the processor, and data.

Inventors

  • 윤준근
  • 윤승범

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260511
Application Date
20200821

Claims (20)

  1. A processor that generates a profile based on the voltage of a battery cell during battery charging, determines the uniformity of the battery cell based on the profile, and performs management and control of the battery using the uniformity; and A storage unit in which profiles per battery cell and algorithms and data driven by the processor are stored; Includes, The above processor is, By comparing the profile generated during the battery charging with the battery cell-specific profile stored in the storage unit, the C-rate is estimated, and uniformity according to the C-rate is determined. A battery management device characterized by determining upper and lower limits of voltage for charging and discharging the battery according to the above uniformity.
  2. In claim 1, The above processor is, A battery management device characterized by generating the profile based on a value obtained by dividing the change in capacity by the change in voltage during charging or discharging of the battery cell.
  3. In claim 1, The above battery cell profile is, A battery management device characterized by mapping and storing the C-rate, which is the amount of current capable of fully charging the capacity of the battery over a predetermined period of time.
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  5. In claim 3, A battery management device characterized by the fact that the uniformity decreases as the above C-rate increases.
  6. In claim 1, The above processor is, A battery management device characterized by determining the uniformity using the peak width of a profile according to the voltage of the battery cell.
  7. In claim 6, The above processor is, A battery management device characterized by determining the uniformity based on the peak of a profile according to the voltage measured during charging or discharging at low current.
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  9. In claim 1, The above processor is, A battery management device characterized by determining the upper and lower limits of the voltage for each battery cell according to the uniformity for each battery cell.
  10. In claim 1, The above processor is, A battery management device characterized by determining upper and lower limits of voltage for charging and discharging the battery cells based on the cell with the lowest uniformity among the battery cells.
  11. In claim 1, The above processor is, A battery management device characterized by determining that the performance or quality of the battery is good when the uniformity is greater than or equal to a predetermined threshold value during the evaluation of the performance or quality of the battery.
  12. In claim 3, The above processor is, A battery management device characterized by estimating the degree of degradation of the battery using changes in the C-rate of the battery cells.
  13. In claim 12, The above processor is, A battery management device characterized by estimating that, when the above C-rate increases, the degree of degradation of the battery has progressed by the amount of the increase in the above C-rate.
  14. A battery whose voltage is charged or discharged to drive a vehicle; A sensor for measuring the voltage of the above battery; and A battery management device that generates a profile based on the voltage of a battery cell during battery charging, determines the uniformity of the battery cell based on the profile, and performs battery management and control using the uniformity; Includes, The above battery management device is, By comparing the profile generated during the above battery charging with the profile for each battery cell stored in the storage unit, the C-rate is estimated, and uniformity according to the C-rate is determined. A vehicle system characterized by determining the upper and lower limits of the voltage for charging and discharging the battery according to the above uniformity.
  15. A step of generating a profile based on the voltage of the battery cell during battery charging; A step of determining the uniformity of the battery cell based on the above profile; and A step of performing battery management and control using the above uniformity Includes, The step of determining the uniformity of the battery cell above is, By comparing the profile generated during the above battery charging with the profile for each battery cell stored in the storage unit, the C-rate is estimated, and uniformity according to the C-rate is determined. The step of performing battery management and control using the above uniformity is, A battery management method characterized by determining upper and lower limits of voltage for charging and discharging the battery according to the above uniformity.
  16. In claim 15, The step of generating the above profile is, A battery management method characterized by generating the profile based on a value obtained by dividing the change in capacity by the change in voltage during charging or discharging of the battery cell.
  17. In claim 15, The step of determining the uniformity of the battery cell above is, A battery management method characterized by comparing a profile for each battery cell, in which the C-rate, which is the amount of current capable of fully charging the capacity of the battery over a predetermined period of time, is mapped and stored, with a profile generated during charging, to estimate the C-rate and determine uniformity according to the C-rate.
  18. In claim 15, The step of determining the uniformity of the battery cell above is, A battery management method characterized by determining the uniformity using the peak width of a profile according to the voltage of the battery cell.
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  20. In claim 15, The step of performing battery management and control using the above uniformity is, A battery management method characterized by estimating the degree of degradation of the battery using changes in the C-rate of the battery cells.

Description

Battery management apparatus, vehicle system including the same, and method thereof The present invention relates to a battery management device, a vehicle system including the same, and a method thereof, and more specifically, to a technology for managing a battery based on evaluating the uniformity of the battery. Electric or hybrid vehicles are equipped with high-voltage batteries that store driving energy. These high-voltage batteries undergo charging and discharging, but the internal materials of the battery are charged and discharged unevenly; furthermore, the non-uniformity of the internal components intensifies during high-energy and rapid charging. However, current battery control does not consider uniformity within the battery, leading to problems such as reduced battery lifespan and performance, or the occurrence of fires of unknown origin. Furthermore, as the use of high-energy and fast-charging batteries has recently increased, the non-uniformity of these batteries is becoming more extreme, necessitating technology to evaluate and utilize this non-uniformity. FIG. 1 is a configuration diagram of a vehicle system including a battery management device according to one embodiment of the present invention. FIG. 2 is a detailed configuration diagram of a battery management device according to one embodiment of the present invention. FIG. 3 is a diagram showing the C-rate profile of a battery cell according to one embodiment of the present invention. FIG. 4 is a diagram showing the peak width per battery cell according to one embodiment of the present invention. FIG. 5 is a diagram showing a profile of each battery cell according to an embodiment of the present invention. FIG. 6 is a schematic diagram illustrating, in its entirety, a uniformity-based battery management method according to one embodiment of the present invention. FIG. 7 is a diagram showing an example of changing the voltage range setting of a battery based on uniformity according to one embodiment of the present invention. FIG. 8 is a drawing showing an example of a battery evaluation item including uniformity according to one embodiment of the present invention. FIG. 9 is a flowchart illustrating a battery management method according to an embodiment of the present invention. FIG. 10 illustrates a computing system according to one embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. The present invention discloses a technology that can increase battery efficiency by evaluating the uniformity of a vehicle's high-voltage battery and managing the battery based on that uniformity. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10. FIG. 1 is a configuration diagram of a vehicle system including a battery management device according to one embodiment of the present invention, and FIG. 2 is a detailed configuration diagram of a battery management device according to one embodiment of the present invention. Referring to FIG. 1, a vehicle system according to one embodiment of the present invention may include a battery management device (100), an OBC (On Board Charger, 200), a voltage divider (300), a high-voltage battery (400), and a sensor (500). At this time, the vehicle system may be an eco-friendly vehicle that uses a battery by charging and discharging, and the eco-friendly vehicle may include an electric vehicle (EV), a hybrid car, a plug-in hybrid car, etc. The battery management device (100) is a battery management system (BMS) and performs battery control and management. That is, the battery management de