Disconnection detection device and its operation method

Abstract

An open circuit detection device according to one embodiment disclosed in this specification includes an acquisition unit that acquires a charging profile of a battery obtained from different C-rates; a detection unit that acquires relationship data between voltage and capacity change based on the charging profile and detects at least two peak values ​​for each C-rate from the relationship data; a comparison unit that compares a first peak value of the at least two peak values ​​for each C-rate with a first reference peak value for each C-rate and compares a second peak value of the at least two peak values ​​for each C-rate with a second reference peak value for each C-rate; and a determination unit that determines whether or not the battery is open circuited based on the comparison result of the comparison unit.

Description

[Technical Field]

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2023-0001961, filed on January 5, 2023, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] SUMMARY OF THE INVENTION The embodiments disclosed herein relate to an open wire detection apparatus and method of operation. [Background technology]

[0003] In recent years, research and development into secondary batteries has been actively conducted. Here, the term "secondary battery" refers to a battery that can be charged and discharged, and includes both conventional Ni / Cd batteries, Ni / MH batteries, and more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd batteries, Ni / MH batteries, etc. Furthermore, lithium-ion batteries can be manufactured to be compact and lightweight, and are used as power sources for mobile devices. Recently, their use has expanded to include electric vehicles, and they are attracting attention as a next-generation energy storage medium.

[0004] Such batteries contain electrodes (positive and negative electrodes). If a battery electrode (especially the negative electrode) becomes disconnected, a short circuit may occur between the battery electrodes. For example, if the negative electrode of a battery becomes disconnected, lithium may be deposited on the disconnected negative electrode, which may cause a short circuit between the positive and negative electrodes. If a short circuit occurs between the battery electrodes, the risk of the battery exploding increases. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to reduce the risk of such a battery explosion, it is important to determine whether or not there is a break in the battery electrodes (especially the negative electrode).

[0006] To this end, a conventional method has been proposed in which the battery is disassembled to check for disconnection of the battery electrodes, but disassembling the battery requires a lot of time and effort.

[0007] Therefore, research is needed into a method for diagnosing the presence or absence of disconnections in battery electrodes without disassembling the battery.

[0008] The technical problems of the embodiments disclosed in this specification are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0009] An open circuit detection device according to one embodiment disclosed in this specification may include an acquisition unit that acquires charging profiles of a battery acquired from different C-rates; a detection unit that acquires relationship data between voltage and capacity change based on the charging profile and detects at least two peak values ​​for each C-rate from the relationship data; a comparison unit that compares a first peak value of the at least two peak values ​​for each C-rate with a first reference peak value for each C-rate and compares a second peak value of the at least two peak values ​​for each C-rate with a second reference peak value for each C-rate; and a determination unit that determines whether or not the battery is open circuited based on the comparison result of the comparison unit, wherein the first reference peak value increases as the C-rate increases, and the second reference peak value decreases as the C-rate increases.

[0010] In one embodiment, the determination unit may determine that an open circuit has occurred in the battery if the first peak value for each of the C-rates is lower than the first reference peak value for each of the C-rates and the second peak value for each of the C-rates is higher than the second reference peak value for each of the C-rates.

[0011] In one embodiment, the first peak value may be a parasitic peak value, and the second peak value may be a peak value other than the parasitic peak value.

[0012] In one embodiment, the at least two peak values ​​for each of the C-rates may further include a third peak value, and the comparison unit may further compare the third peak value of the at least two peak values ​​for each of the C-rates with a third reference peak value for each of the C-rates, and the determination unit may determine whether or not the battery is disconnected based on an additional comparison result between the third peak value and the third reference peak value of the comparison unit, and the third reference peak value may decrease as the C-rate increases.

[0013] In one embodiment, the determination unit may determine that an open circuit has occurred in the battery if the comparison result indicates an open circuit in the battery and the third peak value for each of the C-rates is higher than the third reference peak value for each of the C-rates.

[0014] In one embodiment, the first peak value may be obtained in a first C-rate range, and the second peak value may be obtained in a second C-rate range that includes the first C-rate range.

[0015] An open circuit detection method according to one embodiment disclosed in this specification may include the following operations: acquiring charging profiles of a battery obtained from different C-rates; acquiring relationship data between voltage and capacity change based on the charging profiles; detecting at least two peak values ​​for each C-rate from the relationship data; comparing a first peak value of the at least two peak values ​​for each C-rate with a first reference peak value for each C-rate; comparing a second peak value of the at least two peak values ​​for each C-rate with a second reference peak value for each C-rate; and determining whether or not the battery is open circuited based on a comparison result of the comparing operation. The first reference peak value may increase as the C-rate increases, and the second reference peak value may decrease as the C-rate increases.

[0016] In one embodiment, the determining operation may determine that an open circuit has occurred in the battery if the first peak value for each of the C-rates is lower than the first reference peak value for each of the C-rates and the second peak value for each of the C-rates is higher than the second reference peak value for each of the C-rates.

[0017] In one embodiment, the first peak value may be a parasitic peak value, and the second peak value may be a peak value other than the parasitic peak value.

[0018] In one embodiment, the at least two peak values ​​for each of the C-rates may further include a third peak value, and the comparing operation may compare the third peak value of the at least two peak values ​​for each of the C-rates with a third reference peak value for each of the C-rates, and the determining operation may determine whether or not the battery is disconnected based on an additional comparison result between the third peak value and the third reference peak value, and the third reference peak value may decrease as the C-rate increases.

[0019] In one embodiment, the determining step may determine that an open circuit has occurred in the battery if the comparison result indicates an open circuit in the battery and the third peak value for each of the C-rates is higher than the third reference peak value for each of the C-rates.

[0020] In one embodiment, the first peak value may be obtained in a first C-rate range, and the second peak value may be obtained in a second C-rate range that includes the first C-rate range. [Effects of the Invention]

[0021] According to various embodiments disclosed herein, an open circuit detection device and its operating method can determine whether a battery open circuit has occurred based on the battery's charging profile without disassembling the battery.

[0022] The effects of the open circuit detection device and its operating method disclosed in this specification are not limited to the effects described above, and other effects not mentioned can be clearly understood by those skilled in the art from the disclosure of this specification. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a block diagram of a wire break detection device according to an embodiment of the present disclosure. [Figure 2]1 illustrates an example capacitance change as a function of voltage (dQ / dV) profile according to an embodiment of the present disclosure. [Figure 3] 10 shows a first peak value and a second peak value of a profile of capacitance change (dQ / dV) according to C-rate according to an embodiment of the present disclosure. [Figure 4] 10 shows a third peak value of a capacity differential (dQ / dV) profile according to C-rate according to an embodiment of the present disclosure. [Figure 5] 1 is a flowchart illustrating a method of operating a wire break detection device according to an embodiment of the present disclosure.

[0024] In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar components. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but this is not intended to limit the present invention to the particular embodiments, and should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present invention.

[0026] The embodiments and terms used in this specification are not intended to limit the technical features described in this specification to specific embodiments, but should be understood to include various modifications, equivalents, or alternatives of the embodiments. With regard to the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the item, unless clearly indicated otherwise in the relevant context.

[0027] As used herein, each of the terms "A or B," "at least one of A and B," "at least one of A or B," "A, B or C," "at least one of A, B and C," and "at least one of A, B, or C" may include any one of the items listed therein or all possible combinations thereof. Terms such as "first," "second," "primary," "second," "A," "B," "(a)," or "(b)" may be used simply to distinguish one element from other elements, and do not limit the element in other respects (e.g., importance or order) unless otherwise specified.

[0028] In this specification, when a (e.g., first) component is referred to as being "coupled," "coupled," or "connected" to another (e.g., second) component, with or without the terms "functionally" or "communicatively," or when a reference is made to "coupled" or "connected," it means that the component can be connected to the other component directly (e.g., by wire or wirelessly) or indirectly (e.g., via a third component).

[0029] Methods according to various embodiments disclosed herein may be provided in a computer program product. The computer program product may be traded between a seller and a buyer as a commodity. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read-only memory, CD-ROM) or may be distributed online (e.g., downloaded or uploaded) via an application store or directly between two user devices. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store server, or an intermediary server.

[0030] According to embodiments disclosed herein, each of the components (e.g., modules or programs) described above may include one or more entities, and some of the entities may be separately located in other components. According to embodiments disclosed herein, one or more of the components described above may be omitted, or one or more additional components or operations may be added. Alternatively, or in addition, multiple components (e.g., modules or programs) may be integrated into a single component. In such cases, the integrated component may perform one or more functions of each of the multiple components in a manner that is the same as or similar to that performed by the respective components of the multiple components before the integration. According to embodiments disclosed herein, operations performed by modules, programs, or other components may be performed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be performed in a different order, omitted, or one or more additional operations may be added.

[0031] FIG. 1 is a block diagram of a disconnection detection device 110 according to one embodiment of the present disclosure.

[0032] Referring to FIG. 1, the disconnection detection device 110 may be connected to the electronic device 100 and the user terminal 190 via a wired and / or wireless connection.

[0033] In one embodiment, the connection 11 between the open wire detection device 110 and the electronic device 100 may be a communication connection via a wired and / or wireless network. In one embodiment, the wired network may be based on a local area network (LAN) communication or a power line communication. In one embodiment, the wireless network may be based on a short-range communication network (e.g., Bluetooth, wireless fidelity (WiFi), or infrared data association (IrDA)) or a long-range communication network (e.g., a cellular network, a 4G network, or a 5G network).

[0034] In other embodiments, the connection 11 between the disconnection detection device 110 and the electronic device 100 may be a connection via a communication method between devices (e.g., a bus, a general purpose input and output (GPIO), a serial peripheral interface (SPI), or a mobile industry processor interface (MIPI)).

[0035] In one embodiment, the connection 13 between the wire break detection device 110 and the user terminal 190 may be a communication connection over a wired and / or wireless network.

[0036] In one embodiment, the electronic device 100 may be a mobile device (e.g., a mobile phone, a laptop computer, a smartphone, or a smart pad), an electric vehicle (e.g., an EV (electric vehicle), a HEV (hybrid EV), a PHEV (plug-in HEV), or a FCEV (fuel cell EV)), an energy storage system (ESS), or a battery swapping system (BSS).

[0037] In one embodiment, the electronic device 100 may include one or more battery units 101, 103, 105. Each of the one or more battery units 101, 103, 105 may be a battery cell, a battery module, a battery pack, or a battery rack.

[0038] In one embodiment, the user terminal 190 may be a mobile device (eg, a mobile phone, a laptop computer, a smartphone, a smart pad) or a personal computer (PC).

[0039] In one embodiment, the open wire detection device 110 may include a communication circuit 120, a sensor 140, a memory 160, and a processor 180. Depending on the embodiment, the open wire detection device 110 shown in FIG. 1 may further include at least one component (e.g., a display, an input device, or an output device) other than the components shown in FIG.

[0040] In one embodiment, the communication circuit 120 can establish a wired communication channel and / or a wireless communication channel between the open circuit detection device 110 and the electronic device 100 and / or the user terminal 190, and transmit and receive data to and from the electronic device 100 and / or the user terminal 190 via the established communication channel.

[0041] In one embodiment, the sensor 140 may obtain a value related to the status of the battery units 101, 103, 105 of the electronic device 100. In one embodiment, the status-related value may indicate one or more values ​​for the voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature of the battery units 101, 103, 105, or a combination thereof. Hereinafter, the status-related value may be referred to as a "status value."

[0042] In one embodiment, memory 160 may include volatile memory and / or non-volatile memory.

[0043] In one embodiment, memory 160 may store data used by at least one component (e.g., processor 180) of open wire detection device 110. For example, the data may include software (or associated instructions), input data, or output data. In one embodiment, the instructions, when executed by processor 180, may cause open wire detection device 110 to perform the operations defined by the instructions.

[0044] In one embodiment, memory 160 may include one or more pieces of software (eg, an acquiring unit 162, a detecting unit 164, a comparing unit 166, a determining unit 168, or a combination thereof).

[0045] In one embodiment, processor 180 may include a central processing unit, an application processor, a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor.

[0046] In one embodiment, the processor 180 can execute software (e.g., the acquiring unit 162, the detecting unit 164, the comparing unit 166, the determining unit 168, or a combination thereof) to control at least one other component (e.g., a hardware or software component) of the open circuit detection device 110 connected to the processor 180, and can perform various data processing or calculations.

[0047] The following describes how the disconnection detection device 110 detects whether or not there is a disconnection in the battery units 101, 103, and 105 using the acquisition unit 162, the detection unit 164, the comparison unit 166, the determination unit 168, or a combination thereof.

[0048] The acquisition unit 162 can acquire a battery charge profile. The acquisition unit 162 can acquire a battery charge profile acquired in the process of charging the battery. The acquisition unit 162 can acquire a battery charge profile acquired at a C-rate. Here, the battery charge profile may be a voltage, a current, an amount of charge, or a combination thereof, measured in the process of charging the battery.

[0049] The detection unit 164 can acquire relational data. The detection unit 164 can acquire relational data between voltage and capacitance change amount (dQ / dV). The detection unit 164 can acquire relational data between voltage and capacitance change amount based on the charging profile.

[0050] The detection unit 164 can detect peak values. The detection unit 164 can detect peak values ​​based on the relationship data. The detection unit 164 can detect at least two peak values ​​for each C-rate from the relationship data. Here, the peak values ​​can be local maximums or local minimums included in the capacitance differential curve.

[0051] The comparing unit 166 can compare the peak value with a reference peak value. The comparing unit 166 can compare at least two peak values ​​with the reference peak value. Here, the at least two peak values ​​can be a first peak value, a second peak value, a third peak value, or a combination thereof.

[0052] The comparator 166 may compare the first peak value with a first reference peak value. The comparator 166 may compare the first peak value, among at least two peak values ​​for each C-rate, with the first reference peak value for each C-rate. Here, the first peak value may be a parasitic peak value. The parasitic peak value may occur as the C-rate increases. The parasitic peak value may occur above a certain C-rate. The parasitic peak value may occur as a result of the second peak value decreasing as the C-rate increases. The first reference peak value may increase as the C-rate increases.

[0053] The comparing unit 166 may compare the second peak value with a second reference peak value. The comparing unit 166 may compare the second peak value with the second reference peak value for each C-rate, among at least two peak values ​​for each C-rate. Here, the second peak value may be a peak value other than the parasitic peak value. The second reference peak value may decrease as the C-rate increases.

[0054] The comparison unit 166 can compare a first peak value of the at least two peak values ​​for each C-rate with a first reference peak value for each C-rate, and can compare a second peak value of the at least two peak values ​​for each C-rate with a second reference peak value for each C-rate.

[0055] The comparing unit 166 may further compare the third peak value with a third reference peak value. The comparing unit 166 may further compare the third peak value with a third reference peak value for each C-rate, among the at least two peak values ​​for each C-rate. Here, the third reference peak value may decrease as the C-rate increases.

[0056] The determination unit 168 can determine whether or not there is a disconnection in the battery. The determination unit 168 can determine whether or not there is a disconnection in the battery based on the comparison result. The determination unit 168 can determine whether or not there is a disconnection in the battery based on the comparison result of the comparison unit 166.

[0057] The determination unit 168 may determine that a disconnection has occurred in the battery if the first peak value is lower than the first reference peak value. The determination unit 168 may determine that a disconnection has occurred in the battery if the first peak value for each C-rate is lower than the first reference peak value for each C-rate.

[0058] The determination unit 168 may determine that an open circuit has occurred in the battery if the second peak value is higher than the second reference peak value. The determination unit 168 may determine that an open circuit has occurred in the battery if the second peak value for each C-rate is higher than the second reference peak value for each C-rate.

[0059] The determination unit 168 can determine that an open circuit has occurred in the battery if the first peak value for each of the C-rates is lower than the first reference peak value for each of the C-rates and the second peak value for each of the C-rates is higher than the second reference peak value for each of the C-rates.

[0060] The determination unit 168 can determine whether a battery open circuit has occurred based on the result of the additional comparison between the third peak value and the third reference peak value. The determination unit 168 can determine whether a battery open circuit has occurred based on the comparison result and the additional comparison result. The determination unit 168 can determine whether a battery open circuit has occurred based on the comparison result by the comparison unit 166, and can finally determine whether a battery open circuit has occurred based further on the additional comparison result by the comparison unit 166. The determination unit 168 can finally determine that a battery open circuit has occurred when the comparison result indicates a battery open circuit and the third peak value is higher than the third reference peak value.

[0061] The first, second, or third reference peak value may be a designated peak value, and may be designated based on the C-rate of the battery and the reference battery.

[0062] FIG. 2 illustrates a capacitance change as a function of voltage (dQ / dV) profile according to one embodiment of the present disclosure.

[0063] Referring to FIG. 2, there are curves of capacitance change as a function of voltage based on different C-rates.

[0064] The first peak value may be obtained in a first C-rate range 200. The first peak value may increase as the C-rate increases. The first peak value may be a parasitic peak value. The parasitic peak value may occur as the C-rate increases. That is, the parasitic peak value may only occur above a certain C-rate.

[0065] The second peak value may be obtained in a second C-rate range 202. The second C-rate range 202 may include the first C-rate range 200. The second peak value may decrease as the C-rate increases. Because the second peak value decreases as the C-rate increases, a parasitic peak value may occur in the first C-rate range 200.

[0066] The third peak value may be obtained in a third C-rate range 204. The third peak value may decrease as the C-rate increases.

[0067] Below, with reference to Figures 3 and 4, we will explain how the open circuit detection device 110 detects an abnormal battery that has been opened, based on the change in the peak value of the capacity change amount according to the voltage based on the C-rate described in Figure 2.

[0068] FIG. 3 shows the first peak value and the second peak value of the profile of the capacitance change (dQ / dV) according to the C-rate according to an embodiment of the present disclosure.

[0069] 3, the first peak value may occur only at a specific C-rate of 300 or more and may increase as the C-rate increases. The second peak value may occur at all C-rates and may decrease as the C-rate increases.

[0070] The first normal battery or the second normal battery may be a reference battery. The reference peak value may be specified based on the peak value of the reference battery. In the following description, the first normal battery is assumed to be the reference battery, and the first peak value of the first normal battery is assumed to be the first reference peak value.

[0071] The open circuit detection device 110 can compare the first peak value of the second abnormal battery with the first peak value of the first normal battery. The comparison unit 166 of the open circuit detection device 110 can compare the first peak value of the second abnormal battery with the first peak value of the first normal battery.

[0072] The determination unit 168 can determine whether or not the battery has an open circuit. The determination unit 168 can determine whether or not the battery has an open circuit based on the comparison result of the comparison unit 166. The determination unit 168 can determine that an open circuit has occurred in the battery when the first peak value 312 of the second abnormal battery is lower than the first peak value 310 of the first normal battery.

[0073] FIG. 4 shows a third peak value of a profile of capacitance change (dQ / dV) as a function of C-rate according to an embodiment of the present disclosure.

[0074] Referring to FIG. 4, the third peak value may occur at all C-rates and may increase as the C-rate increases.

[0075] The first normal battery or the second normal battery may be a reference battery. The reference peak value may be specified based on the peak value of the reference battery. In the following description, the first normal battery is assumed to be the reference battery, and the third peak value of the first normal battery is assumed to be the third reference peak value.

[0076] The open circuit detection device 110 can compare the third peak value of the second abnormal battery with the third peak value of the first normal battery. The comparison unit 166 of the open circuit detection device 110 can compare the third peak value of the second abnormal battery with the third peak value of the first normal battery.

[0077] The determination unit 168 may determine whether or not the battery has been disconnected. The determination unit 168 may determine whether or not the battery has been disconnected based on a comparison result obtained by the comparison unit 166 comparing the first peak value and / or the second peak value with the first reference peak value and / or the second reference peak value, respectively, and an additional comparison result obtained by the comparison unit 166 comparing the third peak value with the third reference peak value. If the comparison result indicates a battery disconnection and the third peak value is higher than the third reference peak value, the determination unit 168 may determine that a battery disconnection has occurred.

[0078] The determination unit 168 may determine that an open circuit has occurred in the battery if the third peak value 402 of the second abnormal battery is higher than the third peak value 400 of the first normal battery. The determination unit 168 may determine that an open circuit has occurred in the battery if the comparison result for the second abnormal battery and the first normal battery indicates an open circuit in the battery and the third peak value 402 of the second abnormal battery is higher than the third peak value 400 of the first normal battery.

[0079] FIG. 5 is a flowchart illustrating a method of operation of a wire break detection device according to an embodiment of the present disclosure.

[0080] 5, in operation 500, the acquisition unit 162 may acquire a charging profile. The acquisition unit 162 may acquire a charging profile of a battery acquired in the process of charging the battery. The acquisition unit 162 may acquire charging profiles of the battery acquired at different C-rates.

[0081] In operation 502, the detection unit 164 may acquire relationship data. The detection unit 164 may acquire relationship data between voltage and capacitance change amount (dQ / dV). The detection unit 164 may acquire the relationship data between voltage and capacitance change amount based on the charging profile. Here, the relationship data between voltage and capacitance change amount may be a graph of capacitance change amount as a function of voltage.

[0082] In operation 504, the detection unit 164 can detect peak values. The detection unit 164 can detect peak values ​​based on the relationship data. The detection unit 164 can detect at least two peak values ​​for each C-rate from the relationship data.

[0083] In operation 506, the comparing section 166 can compare the peak value with the reference peak value. The comparing section 166 can compare at least two peak values ​​with the reference peak value.

[0084] The comparison unit 166 can compare the first peak value with the first reference peak value. The comparison unit 166 can compare the first peak value with the first reference peak value for each C-rate, among at least two peak values ​​for each C-rate.

[0085] The comparing unit 166 can compare the second peak value with the second reference peak value. The comparing unit 166 can compare the second peak value with the second reference peak value for each C-rate, among at least two peak values ​​for each C-rate.

[0086] The comparison unit 166 can compare a first peak value of the at least two peak values ​​for each C-rate with a first reference peak value for each C-rate, and can compare a second peak value of the at least two peak values ​​for each C-rate with a second reference peak value for each C-rate.

[0087] The comparing unit 166 may further compare the third peak value with a third reference peak value. The comparing unit 166 may further compare the third peak value with a third reference peak value for each C-rate, among the at least two peak values ​​for each C-rate.

[0088] In operation 508, the determination unit 168 can check (determine) whether or not there is a disconnection in the battery. The determination unit 168 can check (determine) whether or not there is a disconnection in the battery based on the comparison result. The determination unit 168 can check (determine) whether or not there is a disconnection in the battery based on the comparison result. The determination unit 168 can check (determine) whether or not there is a disconnection in the battery based on the comparison result of the comparison unit 166.

[0089] The determination unit 168 can confirm (determine) whether or not a disconnection has occurred in the battery based on the additional comparison result between the third peak value and the third reference peak value. The determination unit 168 can confirm (determine) whether or not a disconnection has occurred in the battery based on the comparison result and the additional comparison result. The determination unit 168 can confirm (determine) whether or not a disconnection has occurred in the battery based on the comparison result by the comparison unit 166, and can finally confirm (determine) whether or not a disconnection has occurred in the battery based on the additional comparison result by the comparison unit 166.

[0090] In operation 510, the determiner 168 may determine that an open circuit has occurred in the battery if the first peak value is lower than the first reference peak value. The determiner 168 may determine that an open circuit has occurred in the battery if the first peak values ​​for each of the different C-rates are lower than the first reference peak values ​​for each of the different C-rates.

[0091] The determination unit 168 may determine that an open circuit has occurred in the battery if the second peak value is higher than the second reference peak value. The determination unit 168 may determine that an open circuit has occurred in the battery if the second peak value for each C-rate is higher than the second reference peak value for each C-rate.

[0092] The determination unit 168 can determine that an open circuit has occurred in the battery if the first peak value for each of the C-rates is lower than the first reference peak value for each of the C-rates and the second peak value for each of the C-rates is higher than the second reference peak value for each of the C-rates.

[0093] If the third peak value is higher than the third reference peak value, the determination unit 168 may determine that an open circuit has occurred in the battery. If the comparison result indicates an open circuit in the battery and the third peak value is higher than the third reference peak value, the determination unit 168 may finally determine that an open circuit has occurred in the battery. Otherwise, the determination unit 168 may determine that the battery is normal in operation 512.

[0094] As used above, terms such as "comprise," "comprise," or "have," unless otherwise specified, mean that the relevant element can be contained within the term, and therefore should be interpreted as not excluding other elements but as including other elements. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed herein belong, unless otherwise defined. Commonly used terms, such as dictionary-defined terms, should be interpreted as consistent with the contextual meaning of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0095] The above description is merely an illustrative example of the technical concepts disclosed in this specification, and various modifications and variations are possible by a person skilled in the art to which the embodiments disclosed in this specification pertain, without departing from the essential characteristics of the embodiments disclosed in this specification. Therefore, the embodiments disclosed in this specification are intended to illustrate, not limit, the technical concepts of the embodiments disclosed in this specification, and such embodiments do not limit the scope of the technical concepts disclosed in this specification. The scope of protection of the technical concepts disclosed in this specification should be interpreted by the scope of the following claims, and all technical concepts within the scope equivalent thereto should be interpreted as being within the scope of the present specification.

Claims

1. an acquisition unit that acquires charging profiles of the battery acquired from different C-rates; a detection unit that acquires relationship data between voltage and capacity change amount based on the charging profile and detects at least two peak values ​​for each C-rate from the relationship data; a comparison unit that compares a first peak value of the at least two peak values ​​for each of the C-rates with a first reference peak value for each of the C-rates, and compares a second peak value of the at least two peak values ​​for each of the C-rates with a second reference peak value for each of the C-rates; a determination unit that determines whether or not the battery is disconnected based on a comparison result of the comparison unit, The first reference peak value increases as the C-rate increases, and the second reference peak value decreases as the C-rate increases.

2. The determination unit 2. The open circuit detection device of claim 1, wherein when a first peak value for each of the C-rates is lower than a first reference peak value for each of the C-rates and a second peak value for each of the C-rates is higher than a second reference peak value for each of the C-rates, it is determined that an open circuit has occurred in the battery.

3. the first peak value is a parasitic peak value, 2. The disconnection detection device according to claim 1, wherein the second peak value is a peak value other than the parasitic peak value.

4. The at least two peak values ​​for each of the C-rates further include a third peak value; the comparison unit further compares the third peak value with a third reference peak value for each of the C-rates among the at least two peak values ​​for each of the C-rates; the determination unit determines whether or not there is an open circuit in the battery based on an additional comparison result between the third peak value and the third reference peak value of the comparison unit; 2. The disconnection detection device of claim 1, wherein the third reference peak value decreases as the C-rate increases.

5. The determination unit 5. The open circuit detection device according to claim 4, wherein if the comparison result indicates an open circuit in the battery and the third peak value for each of the C-rates is higher than the third reference peak value for each of the C-rates, it is determined that an open circuit has occurred in the battery.

6. the first peak value is obtained in a first C-rate range; 2. The disconnection detection device according to claim 1, wherein the second peak value is acquired in a second C-rate range that includes the first C-rate range.

7. An operation of acquiring a charging profile of a battery acquired from different C-rates; an operation of acquiring data on the relationship between voltage and capacitance change amount based on the charging profile; an operation of detecting at least two peak values ​​for each C-rate from the relationship data; an operation of comparing a first peak value of the at least two peak values ​​for each of the C-rates with a first reference peak value for each of the C-rates, and comparing a second peak value of the at least two peak values ​​for each of the C-rates with a second reference peak value for each of the C-rates; and an operation of determining whether or not the battery is disconnected based on a comparison result of the comparing operation, The first reference peak value increases as the C-rate increases, and the second reference peak value decreases as the C-rate increases.

8. The determining operation includes:

8. The method of claim 7, wherein it is determined that an open circuit has occurred in the battery when a first peak value for each of the C-rates is lower than a first reference peak value for each of the C-rates and a second peak value for each of the C-rates is higher than a second reference peak value for each of the C-rates.

9. the first peak value is a parasitic peak value, The disconnection detection method according to claim 7 , wherein the second peak value is a peak value other than the parasitic peak value.

10. The at least two peak values ​​for each of the C-rates further include a third peak value; The comparing operation compares the third peak value with a third reference peak value for each of the C-rates among at least two peak values ​​for each of the C-rates; the determining operation further determines whether the battery is open-circuited based on an additional comparison result between the third peak value and the third reference peak value; 8. The method of claim 7, wherein the third reference peak value decreases as the C-rate increases.

11. The determining step comprises:

11. The open-circuit detection method of claim 10, wherein if the comparison result indicates an open circuit in the battery and a third peak value for each of the C-rates is higher than a third reference peak value for each of the C-rates, it is determined that an open circuit has occurred in the battery.

12. the first peak value is obtained in a first C-rate range; 8. The disconnection detection method according to claim 7, wherein the second peak value is acquired in a second C-rate range that includes the first C-rate range.

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