Battery temperature estimation device and method of operating the same

Abstract

A battery temperature estimation device according to one embodiment disclosed in this document may include: an impedance measurement unit that measures the impedance of the battery according to a frequency; a memory that stores a temperature-impedance imaginary part table according to the frequency; and a controller that estimates the temperature of the battery based on the imaginary part of the impedance corresponding to the frequency using the temperature-impedance imaginary part table.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0012555, filed with the Korean Intellectual Property Office on January 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments disclosed in this document relate to a battery temperature estimation device and its operating method. Background Technology

[0004] Recently, research and development of rechargeable batteries have been actively pursued. Here, rechargeable batteries are batteries that can be recharged and discharged, and include conventional Ni / Cd batteries, Ni / MH batteries, and the more recent lithium-ion batteries. Among rechargeable batteries, lithium-ion batteries have the advantage of a significantly higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, because lithium-ion batteries can be manufactured to be small and lightweight, they are used as power sources for mobile devices, and their applications have recently expanded to electric vehicles, making them a highly anticipated next-generation energy storage medium.

[0005] Since battery fires can cause serious damage to vehicles or devices using batteries, estimating battery temperature is a critical factor in battery control technology. Conventionally, negative temperature coefficient thermistors (NTCs) are used to estimate battery temperature. However, applying NTCs to existing circuits requires device and cable design, and the resulting cost changes can increase costs. Therefore, an efficient method for estimating battery temperature without adding an NTC is needed. Summary of the Invention

[0006] Technical issues

[0007] The purpose of the embodiments disclosed in this document is to provide a battery temperature estimation device and its operating method, which can estimate the battery temperature by using the battery's electrochemical impedance spectroscopy (EIS) measurements without using NTC.

[0008] The technical problems of the embodiments disclosed in this document are not limited to the above-described technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art based on the following description.

[0009] Technical solution

[0010] A battery temperature estimation apparatus according to embodiments disclosed in this document may include: an impedance measurement unit configured to measure the frequency-specific impedance of a battery; a memory configured to store a temperature-impedance imaginary part table based on the frequency; and a controller configured to estimate the battery temperature based on the imaginary part of the frequency-specific impedance using the temperature-impedance imaginary part table.

[0011] In one implementation, the controller can identify a first imaginary part of the impedance corresponding to a first frequency and estimate a first temperature corresponding to the first imaginary part based on a temperature-impedance imaginary part table corresponding to the first frequency.

[0012] In the implementation, the controller can identify the second to fourth imaginary parts corresponding to the second to fourth frequencies, estimate the second to fourth temperatures corresponding to the second to fourth imaginary parts based on the temperature-impedance imaginary part tables corresponding to the second to fourth frequencies respectively, and estimate the average value of the first to fourth temperatures as the temperature of the battery.

[0013] In an implementation, the memory may store a temperature-impedance imaginary part table for each of the multiple frequencies.

[0014] In an implementation, the controller can identify multiple imaginary parts of the impedance corresponding to multiple frequencies, estimate multiple temperatures corresponding to the multiple imaginary parts based on a temperature-impedance imaginary part table corresponding to multiple frequencies, and estimate the temperature of the battery based on the multiple temperatures.

[0015] The operation method of the temperature estimation device according to the embodiments disclosed in this document may include the following steps: measuring the frequency-specific impedance of a battery; storing a table of the imaginary part of temperature-impedance based on the frequency; and estimating the temperature of the battery based on the imaginary part of the frequency-specific impedance using the table of the imaginary part of temperature-impedance.

[0016] In one implementation, the operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using a temperature-impedance imaginary part table may include the following steps: confirming the first imaginary part of the impedance corresponding to the first frequency; and estimating the first temperature corresponding to the first imaginary part based on the temperature-impedance imaginary part table corresponding to the first frequency.

[0017] In an implementation, the operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using a temperature-impedance imaginary part table may include the following steps: identifying the second to fourth imaginary parts corresponding to the second to fourth frequencies; estimating the second to fourth temperatures corresponding to the second to fourth imaginary parts based on the temperature-impedance imaginary part tables corresponding to the second to fourth frequencies respectively; and estimating the average of the first to fourth temperatures as the battery temperature.

[0018] In an implementation, the operation of storing a table of the imaginary part of temperature-impedance based on frequency may include the operation of storing the table of the imaginary part of temperature-impedance for each of a plurality of frequencies.

[0019] In an implementation, the operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using a temperature-impedance imaginary part table may include the following steps: identifying multiple imaginary parts of the impedance corresponding to multiple frequencies respectively; estimating multiple temperatures corresponding to the multiple imaginary parts based on the temperature-impedance imaginary part table corresponding to the multiple frequencies respectively; and estimating the battery temperature based on the multiple temperatures.

[0020] Beneficial effects

[0021] The battery temperature estimation device and its operating method according to the embodiments disclosed in this document can estimate the core temperature of the battery by measuring the EIS of the battery.

[0022] The battery temperature estimation device and its operating method according to the embodiments disclosed in this document can improve SOX accuracy by accurately estimating the battery temperature and reduce costs by reducing NTC.

[0023] The battery temperature estimation apparatus and its operating method according to the embodiments disclosed in this document can estimate the battery temperature based on the imaginary part of the frequency-specific impedance of the battery.

[0024] In addition, various effects can be obtained directly or indirectly through this article. Attached Figure Description

[0025] Figure 1 This is a block diagram illustrating a battery temperature estimation device according to an embodiment disclosed in this document.

[0026] Figures 2a to 2c This is a diagram illustrating an example of the relationship between EIS, frequency, and temperature of a battery according to an embodiment disclosed in this document.

[0027] Figure 3 This is a diagram illustrating an example of a battery temperature estimation device estimating the temperature of a battery according to an embodiment disclosed in this document.

[0028] Figure 4 This is a flowchart illustrating the operation method of a battery temperature estimation device according to an embodiment disclosed in this document.

[0029] Figure 5 and Figure 6 This is a flowchart illustrating the operation method of a battery temperature estimation device according to the embodiments disclosed in this document.

[0030] Figure 7This is a block diagram illustrating the hardware configuration of a computing system configured to perform an operation method of a battery temperature estimation device according to an embodiment disclosed in this document. Detailed Implementation

[0031] In the following, the embodiments disclosed in this document will be described in detail with reference to the exemplary accompanying drawings. When adding reference numerals to components in each drawing, it should be noted that although the same reference numerals are shown in different drawings, the same reference numerals are assigned to the same components as much as possible. In addition, when describing the embodiments disclosed in this document, detailed descriptions of relevant known configurations or functions will be omitted if it is determined that a detailed description of those configurations or functions would hinder the understanding of the embodiments disclosed in this document.

[0032] In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended only to distinguish components from other components, and the nature, order, sequence, etc., of the components are not limited by these terms. Furthermore, unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by one of those skilled in the art. Terms defined in common dictionaries should be interpreted as having the same meaning as they have in the context of the relevant art, and should not be interpreted in an ideal or overly formal sense unless expressly defined in this application.

[0033] Figure 1 This is a block diagram illustrating a battery temperature estimation device according to an embodiment disclosed in this document.

[0034] The battery temperature estimation device 100 can be any of the various electronic devices configured to manage, diagnose, and test batteries. According to one embodiment, the battery temperature estimation device 100 can be included in any of a battery management system (BMS) within a battery pack, a battery management server, a computer, and a cloud server. According to another embodiment, the battery temperature estimation device 100 can also be included in a device such as a charge and discharge cycler configured to test charging and discharging.

[0035] Reference Figure 1 The battery temperature estimation device 100 according to the embodiments disclosed in this document may include an impedance measurement unit 110, a memory 120 and a controller 130.

[0036] The impedance measurement unit 110 can measure the frequency-specific impedance of the battery. For example, the impedance measurement unit 110 can be set to multiple frequencies and measure the impedance corresponding to each of the multiple set frequencies. As another example, the impedance measurement unit 110 can measure the frequency-specific impedance of the battery by using various existing techniques for measuring impedance.

[0037] According to the implementation method, a battery can be a concept that includes at least any one of battery cells, battery modules, and battery packs.

[0038] According to the implementation, the impedance measurement unit 110 can measure the impedance at multiple frequencies by using Fourier transform. In this case, the impedance at multiple frequencies can be measured faster than by measuring the impedance at each frequency individually.

[0039] According to an embodiment, the impedance measurement unit 110 can measure the real and imaginary parts of multiple frequency-specific impedances of the battery. As another example, the impedance measurement unit 110 can measure the amplitude and phase of multiple frequency-specific impedances of the battery.

[0040] According to the implementation, the impedance measurement unit 110 may have a configuration substantially the same as that of the controller 130 or may be implemented as included in the controller 130.

[0041] The memory 120 can store a table of imaginary temperature-impedance based on frequency. For example, the table of imaginary temperature-impedance based on frequency can be measured in advance and stored in the memory 120. According to an embodiment, the table of imaginary temperature-impedance based on frequency can be stored in the memory 120 to correspond to each imaginary part of a plurality of impedances.

[0042] According to an embodiment, memory 120 may store commands, control command codes, control data, or user data for controlling the battery temperature estimation device 100. For example, memory 120 may include at least one of an application program, an operating system (OS), middleware, and a device driver.

[0043] According to the implementation, the memory 120 may include one or more of volatile memory and non-volatile memory. Volatile memory may include dynamic random access memory (DRAM), static RAM (SRAM), synchronous DRAM (SDRAM), phase-change RAM (PRAM), magnetic RAM (MRAM), resistive RAM (RRAM), ferroelectric RAM (FeRAM), etc. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, etc.

[0044] According to an embodiment, the memory 120 may also include non-volatile media such as a hard disk drive (HDD), a solid-state drive (SSD), an embedded multimedia card (eMMC), or a universal flash memory (UFS).

[0045] The controller 130 can estimate the battery temperature based on the imaginary part of the frequency-specific impedance using a temperature-impedance imaginary part table. For example, the controller 130 can set a first frequency and identify a first imaginary part of the impedance corresponding to the first frequency. Additionally, the controller 130 can estimate a first temperature corresponding to the first imaginary part based on the temperature-impedance imaginary part table corresponding to the first frequency.

[0046] According to the implementation, the controller 130 can ultimately estimate a first temperature corresponding to the first frequency and the first imaginary part.

[0047] According to an implementation, the controller 130 can set a second to a fourth frequency among a plurality of frequencies, and identify a second to a fourth imaginary part corresponding to the second to fourth frequencies. Furthermore, the controller 130 can estimate a second to a fourth temperature corresponding to the second to fourth imaginary parts based on a temperature-impedance imaginary part table corresponding to each of the second to fourth frequencies. In this case, the controller 130 can estimate the battery temperature based on the first to fourth temperatures. For example, the controller 130 can estimate the battery temperature as the average of the first to fourth temperatures.

[0048] According to one embodiment, the controller 130 can estimate the temperature more accurately than estimating the battery temperature by the average of the first to fourth temperatures. According to another embodiment, the controller 130 can select any one of the first to fourth temperatures and estimate it as the battery temperature. According to yet another embodiment, the controller 130 can estimate the battery temperature based on at least one of the arithmetic mean, harmonic mean, and root mean of the first to fourth temperatures.

[0049] According to one embodiment, the controller 130 can set multiple frequencies to be used for temperature estimation. The controller 130 can identify multiple imaginary parts of the impedance corresponding to each of the multiple frequencies. Furthermore, the controller 130 can estimate multiple temperatures corresponding to the multiple imaginary parts based on a temperature-impedance imaginary part table corresponding to each of the multiple frequencies. In this case, the controller 130 can estimate the battery temperature based on the multiple temperatures.

[0050] For example, controller 130 can set n (n is a natural number) frequencies and identify n imaginary parts corresponding to each of the n frequencies. Additionally, controller 130 can estimate n temperatures corresponding to the n imaginary parts from a table of n temperature-impedance imaginary parts corresponding to the n frequencies, and can estimate the average of the n temperatures as the battery temperature.

[0051] According to the implementation, when three or more temperatures exist, the controller 130 can estimate the battery temperature by excluding the highest and lowest temperatures and calculating the average value.

[0052] According to the implementation, the controller 130 can estimate the battery temperature by calculating the average and deviation of multiple temperatures, excluding temperatures with deviations greater than a set value, and recalculating the average value.

[0053] In other words, according to the embodiments disclosed in this document, the battery temperature estimation device 100 can estimate the battery temperature based on a single frequency and a single imaginary part, and can estimate the battery temperature based on multiple frequencies and multiple imaginary parts corresponding to the multiple frequencies respectively.

[0054] According to one implementation, controller 130 can control the battery based on the estimated battery temperature. For example, controller 130 can calculate the battery's SOx (e.g., SOC, SOH, SOHQ, SOHC, etc.) based on the estimated battery temperature. As another example, controller 130 can notify the user of the estimated battery temperature. As yet another example, controller 130 can estimate the battery's fire risk based on the estimated battery temperature and can notify the user of the estimation result or log the estimation result.

[0055] According to one implementation, controller 130 can send the estimated battery temperature to a higher-level controller. The higher-level controller can then perform various determinations on the battery based on the received battery temperature.

[0056] The battery temperature estimation device 100 according to the embodiments disclosed in this document can estimate the core temperature of the battery by measuring the EIS of the battery.

[0057] The battery temperature estimation device 100 according to the embodiments disclosed in this document can improve SOX accuracy by accurately estimating the battery temperature and reduce costs by reducing NTC.

[0058] The battery temperature estimation device 100 according to the embodiments disclosed in this document can estimate the battery temperature based on the imaginary part of the frequency-specific impedance of the battery.

[0059] Figures 2a to 2c This is a diagram illustrating an example of the relationship between EIS, frequency, and temperature of a battery according to an embodiment disclosed in this document.

[0060] Reference Figure 2a The impedance measurement unit 110 of the battery temperature estimation device 100 according to the embodiments disclosed in this document can measure the frequency-specific impedance 210 of the battery. The frequency-specific impedance 210 of the battery can be measured as varying with the temperature of the battery.

[0061] Reference Figure 2b The frequency-specific impedance of the battery measured by the impedance measurement unit 110 can correspond to the imaginary part of the frequency-impedance 220. For example, the imaginary part of the frequency-impedance 220 can correspond differently depending on the change in battery temperature.

[0062] In other words, for a given frequency, there can be multiple imaginary parts of the impedance depending on the temperature.

[0063] Reference Figure 2c The memory 120 can store the temperature-impedance imaginary part table 230. For example, Figure 2c The temperature-impedance imaginary part table 230 shown can be a table corresponding to four frequencies, and the memory 120 can store multiple temperature-impedance imaginary part tables corresponding to multiple frequencies.

[0064] According to the implementation, the temperature-impedance imaginary part table 230 may be values ​​measured and stored in the memory 120.

[0065] Figure 3 This is a diagram illustrating an example of a battery temperature estimation device estimating the temperature of a battery according to an embodiment disclosed in this document.

[0066] Reference Figure 3 The controller 130 can identify the first to fourth imaginary parts corresponding to the first to fourth frequencies, respectively.

[0067] Additionally, the controller 130 can confirm the temperature-impedance imaginary part table 310 corresponding to the first to fourth frequencies, respectively.

[0068] The controller 130 can estimate the first to fourth temperatures corresponding to the first to fourth imaginary parts from the temperature-impedance imaginary part table 310 corresponding to the first to fourth frequencies, respectively.

[0069] Additionally, the controller 130 can estimate the final temperature of the battery based on the first to fourth temperatures. For example, the controller 130 can estimate the battery temperature as the average of the first to fourth temperatures.

[0070] although Figure 3 An example is shown in which the controller 130 estimates the battery temperature based on a temperature-impedance imaginary part table corresponding to four frequencies. However, the battery temperature estimation device 100 according to the embodiments disclosed in this document can accurately estimate the battery temperature based on a temperature-impedance imaginary part table corresponding to a single frequency or multiple frequencies.

[0071] Figure 4 This is a flowchart illustrating an operation method of a battery temperature estimation device according to an embodiment disclosed in this document. According to the embodiment, Figure 4 The operation shown can be performed by Figure 1 The battery temperature estimation device 100 in the middle performs the operation.

[0072] Reference Figure 4 In operation 410, the impedance measurement unit 110 can measure the frequency-specific impedance of the battery. For example, the impedance measurement unit 110 can be set to multiple frequencies and measure the impedance corresponding to each of the multiple set frequencies. As another example, the impedance measurement unit 110 can measure the frequency-specific impedance of the battery by using various existing techniques for measuring impedance.

[0073] According to the implementation, the impedance measurement unit 110 can measure the impedance at multiple frequencies by using Fourier transform. In this case, the impedance at multiple frequencies can be measured faster than by measuring the impedance at each frequency individually.

[0074] According to an embodiment, the impedance measurement unit 110 can measure the real and imaginary parts of multiple frequency-specific impedances of the battery. As another example, the impedance measurement unit 110 can measure the amplitude and phase of multiple frequency-specific impedances of the battery.

[0075] In operation 420, memory 120 may store a table of imaginary temperature-impedance based on frequency. For example, the table of imaginary temperature-impedance based on frequency may be measured in advance and stored in memory 120. According to an embodiment, the table of imaginary temperature-impedance based on frequency may be stored in memory 120 to correspond to each imaginary part of a plurality of impedances.

[0076] According to the embodiment, operation 420 can be performed during the manufacture of the battery temperature estimation device 100 or before performing the operation of estimating the battery temperature. That is, operation 420 can be omitted.

[0077] In operation 430, controller 130 can estimate the battery temperature based on the imaginary part of the frequency-specific impedance using a temperature-impedance imaginary part table. For example, controller 130 can estimate the battery temperature by identifying the imaginary part of the impedance corresponding to the frequency and identifying the temperature-impedance imaginary part table corresponding to the frequency.

[0078] Figure 5 and Figure 6 This is a flowchart illustrating a specific example of the operation method of a battery temperature estimation device according to an embodiment disclosed in this document. According to the embodiment, Figure 5 and Figure 6 The operations shown can be performed by Figure 1 The battery temperature estimation device 100 in the middle performs the operation.

[0079] Reference Figure 5In operation 510, the controller 130 can identify the first imaginary part of the impedance corresponding to the first frequency.

[0080] In operation 520, controller 130 can estimate the first temperature corresponding to the first imaginary part based on a temperature-impedance imaginary part table corresponding to the first frequency.

[0081] In operation 530, controller 130 can identify the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies.

[0082] In operation 540, controller 130 can estimate the second to fourth temperatures corresponding to the second to fourth imaginary parts, respectively, based on temperature-impedance imaginary part tables corresponding to the second to fourth frequencies, respectively.

[0083] In operation 550, controller 130 can estimate the average of the first temperature to the fourth temperature as the temperature of the battery.

[0084] According to an embodiment, the controller 130 can estimate the first temperature as the temperature of the battery without performing operations 530 to 550.

[0085] According to the implementation, operations 510 to 550 can be performed to include... Figure 4 In operation 430.

[0086] Reference Figure 6 In operation 610, the controller 130 can identify multiple imaginary parts of the impedance corresponding to multiple frequencies respectively.

[0087] In operation 620, controller 130 can estimate multiple temperatures corresponding to multiple imaginary parts based on temperature-impedance imaginary part tables corresponding to multiple frequencies respectively.

[0088] For example, the controller 130 can set n (n is a natural number) frequencies and identify n imaginary parts corresponding to each of the n frequencies. In addition, the controller 130 can estimate n temperatures corresponding to each of the n imaginary parts from a table of n temperature-impedance imaginary parts corresponding to the n frequencies, and can estimate the average of the n temperatures as the temperature of the battery.

[0089] In operation 630, controller 130 can estimate the battery temperature based on multiple temperatures. For example, controller 130 can estimate the battery temperature as the arithmetic mean of multiple temperatures.

[0090] According to the implementation, when three or more temperatures exist, the controller 130 can estimate the battery temperature by excluding the highest and lowest temperatures and calculating the average value.

[0091] According to the implementation, the controller 130 can estimate the battery temperature by calculating the average and deviation of multiple temperatures, excluding temperatures with deviations greater than a set value, and recalculating the average value.

[0092] According to the implementation, operations 610 to 630 can be performed to include Figure 4 In operation 430.

[0093] According to one implementation, controller 130 can control the battery based on the estimated battery temperature. For example, controller 130 can calculate the battery's SOx (e.g., SOC, SOH, SOHQ, SOHC, etc.) based on the estimated battery temperature. As another example, controller 130 can notify the user of the estimated battery temperature. As yet another example, controller 130 can estimate the battery's fire risk based on the estimated battery temperature and can notify the user of the estimation result or log the estimation result.

[0094] According to one implementation, controller 130 can send the estimated battery temperature to a higher-level controller. The higher-level controller can then perform various determinations on the battery based on the received battery temperature.

[0095] Figure 7 This is a block diagram illustrating the hardware configuration of a computing system configured to perform an operation method of a battery temperature estimation device according to an embodiment disclosed in this document.

[0096] Reference Figure 7 The computing system 1000 according to the embodiments disclosed in this document may include an MCU 1010, a memory 1020, an input / output I / F 1030, and a communication I / F 1040.

[0097] MCU 1010 can be a processor that executes various programs stored in memory 1020 (e.g., battery impedance measurement program, battery temperature estimation program, etc.), processes various information including battery impedance, battery temperature, battery temperature-impedance imaginary part table, etc., through these programs, and executes the aforementioned... Figure 1 The function of the controller in the battery temperature estimation device shown.

[0098] The memory 1020 can store various programs such as battery impedance measurement programs and battery temperature estimation programs. Additionally, the memory 1020 can store various information including battery impedance, battery temperature, and a battery temperature-impedance imaginary part table.

[0099] Multiple memory units 1020 can be provided as needed. The memory units 1020 can be volatile or non-volatile. As volatile memory, memory units 1020 such as RAM, DRAM, SRAM, etc., can be used. As non-volatile memory, memory units 1020 such as ROM, PROM, EEPROM, flash memory, etc., can be used. The examples of memory units 1020 listed above are merely examples, and they are not limited to these examples.

[0100] The Input / Output I / F 1030 can provide an interface that allows data to be sent and received between the MCU 1010 and input devices (not shown), such as keyboards, mice, touch panels, etc., and output devices (not shown), such as displays, etc.

[0101] The Communication I / F 1040 is a component capable of sending and receiving various types of data from a server, and can be any device supporting wired or wireless communication. For example, a battery temperature estimation device can use the Communication I / F 1040 to send and receive various information, including battery impedance, battery temperature, and a battery temperature-frequency meter, from a separately provided external server.

[0102] In this way, since the computer program according to the embodiments disclosed in this document is recorded in memory 1020 and processed by MCU 1010, it can be implemented as a module that, for example, performs each of the functions shown in FIG2.

[0103] The above description is merely an example illustrating the technical spirit disclosed in this document, and those skilled in the art can make various changes and modifications without departing from the basic characteristics of the implementation methods disclosed in this document.

[0104] Therefore, the embodiments disclosed in this document are not intended to limit but rather to explain the technical ideas behind the embodiments disclosed in this document, and the scope of the technical spirit disclosed in this document is not limited by these embodiments. The scope of protection of the technical spirit disclosed in this document should be interpreted by the claims provided below, and all technical spirit within the equivalent scope should be interpreted as being included within the scope of this document.

[0105] [Explanation of reference numerals in the attached figures]

[0106] 100: Battery temperature estimation device

[0107] 110: Impedance Measurement Unit

[0108] 120: Memory

[0109] 130: Controller

[0110] 1000: Computing System

[0111] 1010: MCU

[0112] 1020: Memory

[0113] 1030: Input / Output I / F

[0114] 1040: Communication I / F

Claims

1. A battery temperature estimation device, the battery temperature estimation device comprising: An impedance measurement unit configured to measure the frequency-specific impedance of a battery; The memory is configured to store a table of the imaginary part of temperature-impedance according to frequency; as well as A controller configured to estimate the temperature of the battery based on the imaginary part of the frequency-specific impedance through the temperature-impedance imaginary part table.

2. The battery temperature estimation device according to claim 1, wherein The controller identifies a first imaginary part of the impedance corresponding to a first frequency and estimates a first temperature corresponding to the first imaginary part based on a temperature-impedance imaginary part table corresponding to the first frequency.

3. The battery temperature estimation device according to claim 2, wherein The controller identifies the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies, estimates the second to fourth temperatures corresponding to the second to fourth imaginary parts based on the temperature-impedance imaginary part table corresponding to each of the second to fourth frequencies, and estimates the average value of the first to fourth temperatures as the temperature of the battery.

4. The battery temperature estimation device according to claim 1, wherein The memory stores a table of the imaginary part of temperature-impedance for each of the multiple frequencies.

5. The battery temperature estimation device according to claim 4, wherein, The controller identifies multiple imaginary parts of the impedance corresponding to each of the plurality of frequencies, estimates multiple temperatures corresponding to each of the plurality of imaginary parts based on a temperature-impedance imaginary part table corresponding to each of the plurality of frequencies, and estimates the temperature of the battery based on the plurality of temperatures.

6. A method for operating a temperature estimation device, the method comprising: The operation of measuring the frequency-specific impedance of a battery; Store the operation of the temperature-impedance imaginary part table based on frequency; as well as The operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using the temperature-impedance imaginary part table.

7. The method of operating the temperature estimation device according to claim 6, wherein, The operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using the temperature-impedance imaginary part table includes: The operation of confirming the first imaginary part of the impedance corresponding to the first frequency; and The operation of estimating the first temperature corresponding to the first imaginary part based on the temperature-impedance imaginary part table corresponding to the first frequency.

8. The method of operating the temperature estimation device according to claim 7, wherein, The operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using the temperature-impedance imaginary part table includes: Confirm the operation of the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies; The operation of estimating the second to fourth temperatures corresponding to the second to fourth imaginary parts based on the temperature-impedance imaginary part tables corresponding to each of the second to fourth frequencies; and The operation of estimating the average value of the first temperature to the fourth temperature as the temperature of the battery.

9. The method of operating the temperature estimation device according to claim 6, wherein, The operation of storing the temperature-impedance imaginary part table according to frequency includes the operation of storing the temperature-impedance imaginary part table for each of multiple frequencies.

10. The method of operating the temperature estimation device according to claim 9, wherein, The operation of estimating the battery temperature based on the imaginary part of the frequency-specific impedance using the temperature-impedance imaginary part table includes: The operation confirms the operation of multiple imaginary parts of the impedance corresponding to each of the plurality of frequencies; The operation of estimating multiple temperatures corresponding to each of the multiple imaginary parts based on a temperature-impedance imaginary part table corresponding to each of the multiple frequencies; and The operation of estimating the battery temperature based on the plurality of temperatures.

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