KR-102965284-B1 - BATTERY MANAGEMENT APPARATUS AND BATTERY MANAGEMENT METHOD

KR102965284B1KR 102965284 B1KR102965284 B1KR 102965284B1KR-102965284-B1

Abstract

A battery management device according to one aspect of the present invention comprises: a profile acquisition unit configured to acquire a battery profile representing a correspondence relationship between the voltage and capacity of a battery; a profile adjustment unit configured to generate a positive profile and a negative profile of the battery by adjusting a preset reference positive profile and a reference negative profile to correspond to the battery profile; and a control unit configured to extract parameters for the battery from at least one of the positive profile and the negative profile and to determine an increase rate of available lithium of the battery based on the extracted parameters.

Inventors

김태현
김혜영
최현준

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260513
Application Date: 20240607

Claims (12)

A profile acquisition unit configured to acquire a battery profile representing the correspondence relationship between the voltage and capacity of a battery; A profile adjustment unit configured to generate a positive and negative profile of the battery by adjusting a preset reference positive profile and a reference negative profile to correspond to the battery profile; and A battery management device comprising a control unit configured to determine a first feature value in the above-described cathode profile, and to determine the available lithium increase rate of the battery by adding the capacity loss rate of the battery to a value obtained by dividing the difference between a preset first reference feature value and the first feature value by a preset reference difference value.
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A profile acquisition unit configured to acquire a battery profile representing the correspondence relationship between the voltage and capacity of a battery; A profile adjustment unit configured to generate a positive and negative profile of the battery by adjusting a preset reference positive profile and a reference negative profile to correspond to the battery profile; and The method includes a control unit that determines a first characteristic value in the cathode profile, determines a second characteristic value and a third characteristic value in the anode profile, and determines a capacity loss rate of the battery based on the second characteristic value, the third characteristic value and a preset reference difference value. The above control unit is, A battery management device that determines the increase rate of available lithium of the battery based on the above first feature value, a preset first reference feature value, the above reference difference value, and the above capacity loss rate.
In paragraph 1, The above control unit is, A battery management device characterized by being configured to set charging conditions of the battery based on the above-mentioned available lithium increase rate.
In paragraph 1, The above control unit is, A battery management device characterized by being configured to determine a second feature value in the above positive profile, calculate a change rate of available lithium based on the second feature value, a preset second reference feature value and the reference difference value, and determine the loss rate of available lithium of the battery by summing the change rate of available lithium and the increase rate of available lithium.
In paragraph 6, The above control unit is, A battery management device characterized by being configured to calculate the difference between the second feature value and the second reference feature value to obtain a second difference value, and to calculate the value obtained by dividing the second difference value by the reference difference value as the available lithium change rate.
In paragraph 6, The above control unit is, A battery management device characterized by being configured to compare the above-mentioned available lithium loss rate with a preset threshold value and to diagnose the degradation state of the battery based on the comparison result.
In paragraph 6, The above control unit is, A battery management device characterized by being configured to set charging conditions of the battery based on the above available lithium loss rate.
A battery pack comprising a battery management device according to any one of paragraphs 1 and 4 through 9.
A step of obtaining a battery profile indicating the correspondence relationship between the voltage and capacity of the battery; A step of generating a positive profile and a negative profile by adjusting a preset reference positive profile and a reference negative profile to correspond to the battery profile; and A battery management method comprising the step of determining a first feature value in the above cathode profile, and determining the available lithium increase rate of the battery by adding the capacity loss rate of the battery to the value obtained by dividing the difference between a preset first reference feature value and the first feature value by a preset reference difference value.
A step of obtaining a battery profile indicating the correspondence relationship between the voltage and capacity of the battery; A step of generating a positive profile and a negative profile by adjusting a preset reference positive profile and a reference negative profile to correspond to the battery profile; A step of determining a first characteristic value in the above cathode profile, determining a second characteristic value and a third characteristic value in the above anode profile, and determining a capacity loss rate of the battery based on the second characteristic value, the third characteristic value and a preset reference difference value; and A battery management method comprising the step of determining the increase rate of available lithium of the battery based on the first feature value, a preset first reference feature value, the reference difference value, and the capacity loss rate.

Description

Battery Management Apparatus and Method The present invention relates to a battery management device and method. Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance batteries capable of repeated charging and discharging is actively underway. Currently commercialized batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium batteries. Among these, lithium batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. While much research is being conducted on these batteries in terms of increasing capacity and density, improving lifespan and safety is also important. To enhance battery safety, technology capable of accurately diagnosing the battery's current state is required. The following drawings attached to this specification serve to further enhance understanding of the technical concept of the invention in conjunction with the detailed description of the invention set forth below; therefore, the invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a schematic diagram illustrating a battery management device according to one embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a battery profile and a comparison profile according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a reference anode profile, a reference cathode profile, an anode profile, and a cathode profile according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a profile obtained by repeatedly charging and discharging a battery according to one embodiment of the present invention. Figure 5 is a diagram showing the change rate of available lithium, the loss rate of available lithium, and the increase rate of available lithium at each diagnosis point. FIG. 6 is a drawing illustrating an exemplary configuration of a battery pack including a battery management device according to one embodiment of the present invention. FIG. 7 is a schematic drawing of an automobile according to another embodiment of the present invention. FIG. 8 is a schematic diagram illustrating a battery management method according to another embodiment of the present invention. Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Terms including ordinal numbers, such as first, second, etc., are used for the purpose of distinguishing one of the various components from the rest, and are not used to limit the components by such terms. Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, throughout the specification, when it is said that a part is "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other components in between. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a schematic diagram illustrating a battery management device (100) according to one embodiment of the present invention. Referring to FIG. 1, the battery management device (100) may include a profile acquisition unit (110), a profile adjustment unit (120), and a control unit (130). Here, a battery refers to a single, independent cell that is physically separable and equipped with a negative terminal and a positive terminal. For example, a lithium-ion battery or a lithium-polymer battery may be considered a battery. Additionally, the battery may be of the cylindrical, prismatic, or pouch t