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KR-20260065787-A - Apparatus for managing battery

KR20260065787AKR 20260065787 AKR20260065787 AKR 20260065787AKR-20260065787-A

Abstract

According to one aspect of the present invention, a battery management device capable of more accurately diagnosing whether a battery is abnormal is disclosed. A battery management device according to one aspect of the present invention comprises: a measurement module for measuring state information of a battery; a first diagnosis module configured to diagnose whether the battery is abnormal by comparing the state information measured by the measurement module with a first diagnosis criterion; and a second diagnosis module configured to diagnose whether the battery is abnormal based on the amount of change in the state information measured by the measurement module.

Inventors

  • 박세영

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260511
Application Date
20260428

Claims (15)

  1. A measurement module for measuring battery status information; A first diagnostic module configured to diagnose whether the battery is abnormal by comparing the status information measured by the above-mentioned measurement module with a first diagnostic criterion; and A second diagnostic module configured to diagnose whether the battery is abnormal based on the amount of change in state information measured by the above-mentioned measurement module. Includes, A battery management device characterized in that the second diagnostic module is configured to enable abnormal diagnosis in situations where an abnormality is not diagnosed by the first diagnostic module.
  2. In paragraph 1, The above state information is a voltage value, and A battery management device characterized in that the first diagnostic module and the second diagnostic module are configured to diagnose whether the battery has a low voltage or an overvoltage.
  3. In paragraph 1, The above-mentioned first diagnostic criterion is configured in a multi-stage form, and A battery management device characterized in that the first diagnostic module is configured to divide the abnormal state of the battery into a plurality of diagnostic stages.
  4. In paragraph 1, A battery management device characterized in that the first diagnostic module is configured to diagnose whether the battery is abnormal by taking into account the duration of the status information measured by the measurement module.
  5. In paragraph 1, The above measurement module periodically measures the above state information, and A battery management device characterized in that the second diagnostic module is configured to calculate the amount of change in the state information using the currently measured state information and the state information measured in the previous cycle.
  6. In paragraph 1, A battery management device characterized in that the second diagnostic module is configured to diagnose whether the battery is abnormal by comparing the amount of change in the state information with a second diagnostic criterion.
  7. In paragraph 6, A battery management device characterized in that the second diagnostic module is configured to diagnose an abnormality of the battery by comparing the number of times the amount of change in the state information deviates from the second diagnostic standard with the reference number.
  8. In Paragraph 7, A battery management device characterized in that the above reference count has different values depending on the amount of change in the above state information.
  9. In paragraph 8, A battery management device characterized in that the second diagnostic module is configured to diagnose by changing the reference number when the amount of change in the state information changes.
  10. In paragraph 1, A battery management device characterized in that the second diagnostic module is configured to operate when the measured state information deviates from the third diagnostic criterion by comparing the state information measured by the measurement module with the third diagnostic criterion.
  11. In paragraph 1, A battery management device characterized in that the second diagnostic module is configured to block the charging or discharging operation of the battery when the battery is diagnosed as abnormal.
  12. In paragraph 1, A battery management device characterized in that the second diagnostic module is configured to perform an operation preferentially over the first diagnostic module.
  13. A battery pack comprising a battery management device according to any one of paragraphs 1 to 12.
  14. An automobile comprising a battery management device according to any one of paragraphs 1 through 12.
  15. A battery providing system comprising a battery management device according to any one of paragraphs 1 to 12.

Description

Battery management device {Apparatus for managing battery} The present invention relates to battery management technology, and more specifically, to a technology capable of more accurately diagnosing whether a battery is abnormal. Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. Recently, batteries (secondary batteries) are widely used for propulsion or energy storage in vehicles such as electric motorcycles and electric vehicles, as well as in medium-to-large devices such as Energy Storage Systems (ESS). As a result, interest in batteries is increasing, and related research and development is becoming more active. Furthermore, commercialization and research on interchangeable battery packs are also actively underway for electric motorcycles and electric vehicles. Lithium secondary batteries primarily use lithium-based oxides and carbon materials as positive and negative active materials, respectively. Furthermore, the lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte. A battery module or battery pack can be formed by housing multiple secondary batteries together inside a module case (module housing) or a pack case (pack housing) while electrically connected to each other. In this case, each secondary battery included in the battery module or battery pack may be referred to as a battery cell. In order to ensure stable performance for batteries in the form of battery cells, battery modules, or battery packs, and to protect devices equipped with such batteries or users utilizing such batteries, it is very important to diagnose the condition of the battery and take appropriate measures. As a representative technology for this purpose, control devices such as a Battery Management System (BMS) are included in battery packs or ESSs to diagnose the battery and take related measures. In particular, it is crucial to promptly and accurately diagnose any abnormal situations that occur during battery use. If such abnormal conditions, such as high or low voltage, are not properly diagnosed, it can lead not only to battery failure or damage but, in severe cases, to ignition or explosion, causing significant loss of life or property. Although various technologies have been developed or used to diagnose abnormal battery conditions involving high or low voltage, it is difficult to say that sufficient technology has yet been secured. In particular, in exceptional situations where charging or discharging occurs very rapidly, the technology capable of quickly diagnosing the situation and promptly taking appropriate countermeasures is still considered insufficient. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a block diagram schematically illustrating the functional configuration of a battery management device according to one embodiment of the present invention. FIG. 2 is a diagram showing an example of a plurality of diagnostic steps by a first diagnostic module of a battery management device according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing an example of a low voltage diagnosis standard of a battery by a first diagnosis module according to an embodiment of the present invention. FIG. 4 is a graph showing the voltage measurement results of a battery according to one embodiment of the present invention. FIG. 5 is a diagram schematically illustrating an example of a low-voltage diagnostic standard for a battery by a second diagnostic module according to an embodiment of the present invention. FIG. 6 is a graph showing voltage measurements of a battery according to different embodiments of the present invention. FIG. 7 is a graph schematically illustrating the configuration for diagnosing whether a battery is abnormal by a second diagnostic module according to one embodiment of the present invention. FIG. 8 is a table schematically showing the low voltage diagnosis criteria of a battery by a second diagnostic module according to another embodiment of the present invention. FIG. 9 is a flowchart schematically illustrating the operati