KR-20260063521-A - METHOD AND APPARATUS FOR DETECTING INSULATION DEFECT OF BATTERY, AND BATTERY SYSTEM

KR20260063521AKR 20260063521 AKR20260063521 AKR 20260063521AKR-20260063521-A

Abstract

A method for detecting insulation failure of a battery rack may be provided. The method for detecting insulation failure includes the steps of: measuring a first voltage corresponding to the voltage of a positive terminal of a battery rack in a first section; measuring a second voltage corresponding to the voltage of a positive terminal of a battery rack and a third voltage corresponding to the voltage of a negative terminal of a battery rack in a second section, respectively; measuring a fourth voltage corresponding to the voltage of a negative terminal of a battery rack in a third section; measuring an insulation resistance value of the battery rack based on the first voltage and the fourth voltage; and determining whether there is an insulation failure of the battery rack or the location of the insulation failure based on the insulation resistance value of the battery rack.

Inventors

오쿠이 요시아키

Assignees

삼성에스디아이 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (19)

A step of measuring a first voltage corresponding to the voltage of the positive terminal of the battery rack in the first section, A step of measuring, respectively, a second voltage corresponding to the voltage of the positive terminal of the battery rack and a third voltage corresponding to the voltage of the negative terminal of the battery rack in the second section. A step of measuring a fourth voltage corresponding to the voltage of the negative terminal of the battery rack in the third section, A step of measuring the insulation resistance value of the battery rack based on the first voltage and the fourth voltage, and A step of determining whether the battery rack has insulation failure based on the insulation resistance value of the battery rack. A method for detecting insulation defects including
In paragraph 1, If it is determined that the battery rack has insulation failure, the step of detecting the location of the insulation failure in the battery rack using the second voltage and the third voltage. A method for detecting insulation failure that further includes
In paragraph 2, The step of detecting the location of the insulation defect above A step of calculating a ground fault voltage using the second voltage, the third voltage, and the insulation resistance, A step of calculating the voltage between the positive terminal of the battery rack and ground using the ground fault voltage and the second voltage, A step of calculating the relative position of an insulation failure using the ground fault voltage and the voltage between the positive terminal of the battery rack and the ground, and A step comprising specifying an insulation failure location from the above insulation failure relative location, Method for detecting insulation failure.
In paragraph 3, The above insulation failure relative position represents a size value separated from the position of the negative terminal of the battery rack between the negative terminal of the battery rack and the positive terminal of the battery rack, based on the position of the negative terminal of the battery rack. Method for detecting insulation failure.
In paragraph 4, The step of specifying the location of the insulation defect mentioned above If the relative position of the insulation failure is 0%, the step of specifying the position of the negative terminal of the battery rack as the insulation failure position, If the relative position of the insulation failure is 100%, the step of specifying the position of the positive terminal of the battery rack as the insulation failure position, and If the relative position of the insulation failure is 50%, the step of specifying the midpoint between the negative terminal of the battery rack and the positive terminal of the battery rack as the insulation failure location is included. Method for detecting insulation failure.
In paragraph 1, The step of measuring the first voltage in the first section includes the step of turning on a first switch connected between the positive terminal of the battery rack and the inverting input terminal of the first operational amplifier, and The step of measuring the fourth voltage in the third section includes the step of turning on a second switch connected between the negative terminal of the battery rack and the inverting input terminal of the second operational amplifier, and The step of measuring the second voltage and the third voltage, respectively, in the second section includes the step of turning on the first switch and the second switch simultaneously. Method for detecting insulation failure.
A first voltage measuring unit for measuring the voltage of the positive terminal of a battery rack, A second voltage measuring unit for measuring the voltage of the negative terminal of the battery rack, A control unit that measures the voltage of the positive terminal as a first voltage in a first section, measures the voltage of the positive terminal and the voltage of the negative terminal as a second voltage and a third voltage, respectively, in a second section, and measures the voltage of the negative terminal as a fourth voltage in a third section, and An insulation resistance measuring unit that detects the insulation state of the battery rack using the first voltage, the second voltage, the third voltage, and the fourth voltage. An insulation failure detection device including
In Paragraph 7, The insulation resistance measuring unit measures the insulation resistance value of the battery rack based on the first voltage and the fourth voltage, and determines that the insulation resistance value of the battery rack is below a set threshold value, thereby determining that the battery rack has an insulation failure. Insulation failure detection device.
In paragraph 8, The insulation resistance measuring unit detects the location of the insulation failure in the battery rack using the second voltage and the third voltage when it is determined from the insulation resistance value of the battery rack that the battery rack has an insulation failure. Insulation failure detection device.
In Paragraph 9, The insulation resistance measuring unit calculates a ground fault voltage using the second voltage, the third voltage, and the insulation resistance value, calculates a voltage between the positive terminal of the battery rack and ground using the ground fault voltage and the second voltage, calculates a relative location of insulation failure using the ground fault voltage and the voltage between the positive terminal of the battery rack and ground, and identifies the insulation failure location from the relative location of insulation failure. Insulation failure detection device.
In Paragraph 10, The above insulation failure relative position represents a size value separated from the position of the negative terminal of the battery rack between the negative terminal of the battery rack and the positive terminal of the battery rack, based on the position of the negative terminal of the battery rack. Insulation failure detection device.
In Paragraph 11, The insulation resistance measuring unit specifies the location of the negative terminal of the battery rack as the insulation failure location if the relative insulation failure location is 0%, specifies the location of the positive terminal of the battery rack as the insulation failure location if the relative insulation failure location is 100%, and specifies the midpoint between the negative terminal of the battery rack and the positive terminal of the battery rack as the insulation failure location if the relative insulation failure location is 50%. Insulation failure detection device.
In Paragraph 10, The first voltage measuring unit includes a first operational amplifier and a first switch connected between the first input terminal of the first operational amplifier and the positive terminal of the battery rack, and The second voltage measuring unit includes a second operational amplifier and a second switch connected between the first input terminal of the second operational amplifier and the negative terminal of the battery rack, and The control unit turns on only the first switch in the first section, maintains the ON state of the first switch and turns on the second switch in the second section, turns off the first switch and maintains the ON state of the second switch in the third section, Insulation failure detection device.
A battery rack including multiple battery cells, and A rack battery management system that measures the voltage of the positive terminal of the battery rack as a first voltage in a first section, measures the voltages of the positive terminal and the negative terminal of the battery rack as a second voltage and a third voltage, respectively, in a second section after the first section, measures the voltage of the negative terminal of the battery rack as a fourth voltage in a third section after the second section, and detects the insulation state of the battery rack based on the first voltage, the second voltage, the third voltage, and the fourth voltage. A battery system including
In Paragraph 14, The above rack battery management system measures the insulation resistance of the battery rack based on the first voltage and the fourth voltage, and determines that the insulation resistance of the battery rack is below a set threshold value, thereby determining that the battery rack has an insulation failure. Battery system.
In paragraph 15, The above rack battery management system detects the location of the insulation failure in the battery rack using the second voltage and the third voltage when it is determined from the insulation resistance of the battery rack that the battery rack has an insulation failure. Battery system.
In Paragraph 16, The above rack battery management system calculates a ground fault voltage using the second voltage, the third voltage, and the insulation resistance, calculates a voltage between the positive terminal of the battery rack and ground using the ground fault voltage and the second voltage, calculates a relative location of insulation failure using the ground fault voltage and the voltage between the positive terminal of the battery rack and ground, and the insulation resistance measuring unit identifies the insulation failure location from the relative location of insulation failure. Battery system.
In Paragraph 17, The above insulation failure relative position represents a size value separated from the position of the negative terminal of the battery rack between the negative terminal of the battery rack and the positive terminal of the battery rack, based on the position of the negative terminal of the battery rack. Battery system.
In Paragraph 17, The above rack battery management system A first voltage measuring unit comprising a first operational amplifier and a first switch connected between the first input terminal of the first operational amplifier and the positive terminal of the battery rack, wherein the first voltage measuring unit measures the voltage of the positive terminal of the battery rack when the first switch is turned on. A second operational amplifier and a second switch connected between a first input terminal of the second operational amplifier and a negative terminal of the battery rack, and a second voltage measuring unit that measures the voltage of the negative terminal of the battery rack when the second switch is turned on, and A control unit comprising turning on only the first switch in the first section, maintaining the ON state of the first switch and turning on the second switch in the second section, turning off the first switch and maintaining the ON state of the second switch in the third section, Battery system.

Description

Method and apparatus for detecting insulation defects in a battery, and battery system This description relates to a method and apparatus for detecting insulation defects in a battery, and to a battery system. An Energy Storage System (ESS) may include multiple battery cells. Since an insulation failure in even one of the multiple battery cells can lead to a fire, it is important to monitor the insulation status of the battery cells. Currently, the most widely used insulation monitoring method is the use of an insulation monitoring device (IMD), which allows monitoring of the insulation status through changes in the overall insulation resistance in the event of insulation breakdown or degradation. Therefore, in ESSs where multiple battery cells are connected in series and parallel, it is difficult to accurately locate the position of insulation failures. FIG. 1 is a drawing showing an energy storage system according to one embodiment. FIG. 2 is a drawing showing an insulation defect detection device according to one embodiment. FIG. 3 is a diagram showing the switching timing for measuring insulation resistance according to an embodiment. FIG. 4 is a flowchart illustrating an insulation resistance measurement method according to one embodiment. Figures 5 and 6 are drawings showing the insulation failure detection simulation results of an insulation failure detection device according to an embodiment, respectively. FIG. 7 is a drawing showing a battery insulation failure detection device according to another embodiment. Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are given similar reference numerals. In the flowcharts described with reference to the drawings, the order of operations may be changed, various operations may be merged or certain operations may be divided, and specific operations may not be performed. Throughout the specification and claims, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, expressions written in the singular form may be interpreted as singular or plural unless explicit expressions such as "one" or "singular" are used. Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. Furthermore, when it is stated that one component is "connected" to another component, this includes not only cases where they are "directly or physically connected," but also cases where they are "indirectly or non-contactually connected" with another component in between, or where they are "electrically connected." On the other hand, when it is stated that one component is "directly connected" to another component, it should be understood that there is no other component present in between. FIG. 1 is a drawing showing an energy storage system according to one embodiment. Referring to FIG. 1, the energy storage system (10) may include a battery system (100), a power conversion system (PCS) (200), a switching unit (300), and an energy management system (EMS) (400). The battery system (100) can be charged by receiving power from a grid or power generation system and can be discharged to supply power to a load or grid. The battery system (100) may include a plurality of battery racks (110), a plurality of rack battery management systems (RBMS) (120), a plurality of rack switches (130), and a system BMS (SBMS) (140). A battery rack (110) may include a plurality of battery modules (112). A battery module (112) may include a plurality of battery cells. A battery cell may be the smallest unit of a battery system. Here, depending on the device or system in which the battery system (100) is used, the battery rack (110) may be referred to as a battery pack. A plurality of RBMSs (120) can each be connected to a plurality of battery racks (110) and can monitor a plurality of battery racks (110). A plurality of RBMSs (120) can each measure or collect status information such as current, voltage, temperature, SOC (Status Of Charge), SOH (Status Of Health), DOD (Depth Of Discharge), maximum power, and capacity of a corresponding battery rack (110) and/or batter