Battery temperature estimation device and method for operating same

Abstract

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

Description

Battery temperature estimation device and its operating method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2024-0012555, filed January 26, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a battery temperature estimation device and an operating method thereof.

[0005] Recently, research and development on secondary batteries has been actively conducted. Here, secondary batteries are rechargeable and include both conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form, making them suitable for use as power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.

[0006] Because battery fires can cause serious damage to vehicles or battery-powered devices, estimating battery temperature is essential for battery control technology. Traditionally, Negative Temperature Coefficient Thermistors (NTCs) have been used to estimate battery temperature. However, incorporating NTCs into existing circuits requires additional mechanical and cable design, and design changes can increase costs. Therefore, an effective method for estimating battery temperature without adding an NTC is needed.

[0007] One purpose of the embodiments disclosed in this document is to provide a battery temperature estimation device and an operating method thereof that can estimate the temperature of a battery by utilizing EIS (Electrochemical Impedance Spectroscopy) measurements of the battery without utilizing an NTC.

[0008] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0009] A battery temperature estimation device according to one embodiment disclosed in this document may include an impedance measuring unit that measures impedance of a battery according to frequency, a memory that stores a temperature-impedance imaginary part table according to frequency, and a controller that estimates a temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance according to frequency.

[0010] In one embodiment, the controller can identify a first imaginary part of an 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.

[0011] In one embodiment, the controller may identify the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies, estimate the second to fourth temperatures 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, and estimate the temperature of the battery as an average of the first to fourth temperatures.

[0012] In one embodiment, the memory may store a temperature-impedance imaginary part table for each of a plurality of frequencies.

[0013] In one embodiment, the controller can identify a plurality of imaginary parts of impedance corresponding to each of a plurality of frequencies, estimate a plurality of 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 estimate a temperature of the battery based on the plurality of temperatures.

[0014] An operating method of a battery temperature estimation device according to one embodiment disclosed in this document may include an operation of measuring a frequency-dependent impedance of a battery, an operation of storing a temperature-impedance imaginary part table according to frequency, and an operation of estimating a temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the frequency-dependent impedance.

[0015] In one embodiment, the operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency may include 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.

[0016] In one embodiment, the operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency may include the operation of confirming 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 table corresponding to each of the second to fourth frequencies, and the operation of estimating the temperature of the battery as an average of the first to fourth temperatures.

[0017] In one embodiment, the operation of storing the temperature-impedance imaginary part table according to the frequency may store the temperature-impedance imaginary part table for each of a plurality of frequencies.

[0018] In one embodiment, the operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency may include the operation of confirming a plurality of imaginary parts of the impedance corresponding to each of a plurality of frequencies, the operation of estimating a plurality of temperatures corresponding to each of the plurality of imaginary parts based on the temperature-impedance imaginary part table corresponding to each of the plurality of frequencies, and the operation of estimating the temperature of the battery based on the plurality of temperatures.

[0019] A battery temperature estimation device and its operating method according to one embodiment disclosed in this document can estimate the core temperature of a battery by measuring the EIS of the battery.

[0020] A battery temperature estimation device and its operating method according to one embodiment disclosed in this document can increase SOX accuracy by accurately estimating the temperature of a battery and reduce costs due to NTC reduction.

[0021] A battery temperature estimation device and its operating method according to one embodiment disclosed in this document can estimate the temperature of a battery based on the imaginary part of the frequency-dependent impedance of the battery.

[0022] In addition, various effects may be provided, either directly or indirectly, through this document.

[0023] FIG. 1 is a block diagram showing a battery temperature estimation device according to one embodiment disclosed in this document.

[0024] FIGS. 2A to 2C are diagrams illustrating the relationship between EIS, frequency, and temperature of a battery according to one embodiment disclosed in the present document.

[0025] FIG. 3 is a drawing showing an example of a battery temperature estimation device according to one embodiment disclosed in this document estimating the temperature of a battery.

[0026] FIG. 4 is a flowchart showing an operation method of a battery temperature estimation device according to one embodiment disclosed in this document.

[0027] FIG. 5 and FIG. 6 are flowcharts specifically showing an operation method of a battery temperature estimation device according to one embodiment disclosed in this document.

[0028] FIG. 7 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery temperature estimation device according to one embodiment disclosed in this document.

[0029] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments disclosed in this document, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments disclosed in this document.

[0030] 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 only intended to distinguish the components from other components and do not limit the nature, order, or sequence of the components. In addition, unless otherwise defined, all terms used herein, 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 in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0031] FIG. 1 is a block diagram showing a battery temperature estimation device according to one embodiment disclosed in this document.

[0032] The battery temperature estimation device (100) may be a variety of electronic devices for managing, diagnosing, and testing batteries. According to an embodiment, the battery temperature estimation device (100) may be included in any one 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) may be included in a device for charge / discharge testing, such as a charge / discharge cycler.

[0033] Referring to FIG. 1, a battery temperature estimation device (100) according to one embodiment disclosed in this document may include an impedance measurement unit (110), a memory (120), and a controller (130).

[0034] The impedance measuring unit (110) can measure the impedance of the battery at different frequencies. For example, the impedance measuring unit (110) can set multiple frequencies and measure the impedance corresponding to the set multiple frequencies. As another example, the impedance measuring unit (110) can measure the impedance of the battery at different frequencies by utilizing various existing impedance measuring techniques.

[0035] According to an embodiment, the battery may be a concept including at least one of a battery cell, a battery module, and a battery pack.

[0036] According to an embodiment, the impedance measurement unit (110) may measure impedance at multiple frequencies by utilizing Fourier transform. In this case, the impedance at multiple frequencies can be measured more quickly than a method of measuring impedance at each frequency separately.

[0037] According to an embodiment, the impedance measuring unit (110) can measure the real and imaginary parts of the impedance of the battery for multiple frequencies. As another example, the impedance measuring unit (110) can measure the magnitude and phase of the impedance of the battery for multiple frequencies.

[0038] According to an embodiment, the impedance measurement unit (110) may have substantially the same configuration as the controller (130) or may be implemented by being included in the controller (130).

[0039] The memory (120) can store a temperature-impedance imaginary part table according to frequency. For example, the temperature-impedance imaginary part table according to frequency can be measured in advance and stored in the memory (120). According to an embodiment, the temperature-impedance imaginary part table according to frequency can be stored in the memory (120) so as to correspond to each of a plurality of frequencies.

[0040] According to an embodiment, the memory (120) may store commands, control command codes, control data, or user data for controlling the battery temperature estimation device (100). For example, the memory (120) may include at least one of an application program, an operating system (OS), middleware, or a device driver.

[0041] According to an embodiment, the memory (120) may include one or more of volatile memory or non-volatile memory. The 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. The non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, etc.

[0042] According to an embodiment, the memory (120) may further include a non-volatile medium such as a hard disk drive (HDD), a solid state disk (SSD), an embedded multi media card (eMMC), or a universal flash storage (UFS).

[0043] The controller (130) can estimate the temperature of the battery through a temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency. For example, the controller (130) can set a first frequency and check the first imaginary part of the impedance corresponding to the first frequency. In addition, the controller (130) can measure a first temperature corresponding to the first imaginary part based on the temperature-impedance imaginary part table corresponding to the first frequency.

[0044] According to an embodiment, the controller (130) may finally estimate the temperature of the battery as the first temperature corresponding to the first frequency and the first imaginary part.

[0045] According to an embodiment, the controller (130) can set the second to fourth frequencies among a plurality of frequencies, and can check the second to fourth imaginary parts corresponding to the second to fourth frequencies. In addition, the controller (130) can estimate the second to fourth temperatures 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 temperature of the battery based on the first to fourth temperatures. For example, the controller (130) can estimate the temperature of the battery as an average of the first to fourth temperatures.

[0046] In an embodiment, the controller (130) can estimate a more accurate temperature than when estimating the temperature of the battery as an average of the first to fourth temperatures. In another embodiment, the controller (130) can select any one of the first to fourth temperatures and estimate the temperature of the battery. In another embodiment, the controller (130) can estimate the temperature of the battery based on at least one of the arithmetic mean, the harmonic mean, and the root mean of the first to fourth temperatures.

[0047] According to an embodiment, the controller (130) can set multiple frequencies to be used for temperature estimation among the frequencies. 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 each of 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 temperature of the battery based on the multiple temperatures.

[0048] For example, the controller (130) can set n frequencies (n is a natural number) and check n imaginary parts corresponding to each of the n frequencies. In addition, the controller (130) can estimate n temperatures corresponding to the n imaginary parts from each of n temperature-impedance imaginary part tables corresponding to each of the n frequencies, and can estimate the temperature of the battery as an average of the n temperatures.

[0049] According to an embodiment, the controller (130) can estimate the temperature of the battery by calculating an average, excluding the highest temperature and the lowest temperature, when there are three or more temperatures.

[0050] According to an embodiment, the controller (130) may estimate the temperature of the battery by calculating the average and deviation of a plurality of temperatures, excluding temperatures whose deviation is greater than a set value, and calculating the average again.

[0051] That is, according to the embodiments disclosed in this document, the battery temperature estimation device (100) may estimate the temperature of the battery based on a single frequency and a single imaginary part, or may estimate the temperature of the battery based on a plurality of frequencies and a plurality of imaginary parts corresponding to each of the plurality of frequencies.

[0052] In an embodiment, the controller (130) can control the battery based on the estimated battery temperature. For example, the controller (130) can calculate the SOX (e.g., SOC, SOH, SOHQ, SOHC, etc.) of the battery based on the estimated battery temperature. For another example, the controller (130) can inform the user of the estimated battery temperature. For another example, the controller (130) can estimate the fire risk of the battery based on the estimated battery temperature, and can inform the user of the estimation result or record it in a log.

[0053] According to an embodiment, the controller (130) may transmit the estimated battery temperature to the upper controller. The upper controller may perform various judgments regarding the battery based on the received battery temperature.

[0054] A battery temperature estimation device (100) according to one embodiment disclosed in this document can estimate the core temperature of a battery by measuring the EIS of the battery.

[0055] The battery temperature estimation device (100) according to one embodiment disclosed in this document can increase SOX accuracy by accurately estimating the temperature of the battery and reduce costs due to NTC reduction.

[0056] A battery temperature estimation device (100) according to one embodiment disclosed in this document can estimate the temperature of a battery based on the imaginary part of the frequency-dependent impedance of the battery.

[0057] FIGS. 2A to 2C are diagrams illustrating the relationship between EIS, frequency, and temperature of a battery according to one embodiment disclosed in the present document.

[0058] Referring to FIG. 2A, the impedance measuring unit (110) of the battery temperature estimation device (100) according to one embodiment disclosed in the present document can measure the frequency-dependent impedance (210) of the battery. The frequency-dependent impedance (210) of the battery can be measured differently as the temperature of the battery changes.

[0059] Referring to Fig. 2b, the frequency-dependent impedance of the battery measured by the impedance measurement unit (110) may correspond to the frequency / impedance imaginary part (220). For example, the frequency / impedance imaginary part (220) may correspond differently as the temperature of the battery changes.

[0060] That is, multiple impedance imaginary parts can correspond to one frequency depending on the temperature.

[0061] Referring to FIG. 2C, the memory (120) can store a temperature-impedance imaginary part table (230). For example, the temperature-impedance imaginary part table (230) illustrated in FIG. 2C can be a table corresponding to four frequencies, and the memory (120) can store a plurality of temperature-impedance imaginary part tables corresponding to a plurality of frequencies.

[0062] According to an embodiment, the temperature-impedance imaginary part table (230) may be a value that has been measured and stored in the memory (120).

[0063] FIG. 3 is a drawing showing an example of a battery temperature estimation device according to one embodiment disclosed in this document estimating the temperature of a battery.

[0064] Referring to FIG. 3, the controller (130) can identify the first to fourth imaginary parts corresponding to the first to fourth frequencies, respectively.

[0065] Additionally, the controller (130) can check the temperature-impedance imaginary part table (310) corresponding to the first to fourth frequencies, respectively.

[0066] The controller (130) can estimate the first temperature to the fourth temperature corresponding to the first to fourth imaginary parts, respectively, in the temperature-impedance imaginary part table (310) corresponding to the first to fourth frequencies, respectively.

[0067] 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 temperature of the battery as an average of the first to fourth temperatures.

[0068] Although FIG. 3 illustrates an example in which the controller (130) estimates the temperature of the battery based on a temperature-impedance imaginary part table corresponding to four frequencies, the battery temperature estimation device (100) according to the embodiments disclosed in this document can accurately estimate the temperature of the battery based on a temperature-impedance imaginary part table corresponding to one or more frequencies.

[0069] FIG. 4 is a flowchart illustrating an operating method of a battery temperature estimation device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIG. 4 may be performed by the battery temperature estimation device (100) of FIG. 1.

[0070] Referring to FIG. 4, in operation 410, the impedance measuring unit (110) can measure the impedance of the battery according to its frequency. For example, the impedance measuring unit (110) can set multiple frequencies and measure the impedance corresponding to the set multiple frequencies. As another example, the impedance measuring unit (110) can measure the impedance of the battery according to its frequency by utilizing various existing impedance measuring techniques.

[0071] According to an embodiment, the impedance measurement unit (110) may measure impedance at multiple frequencies by utilizing Fourier transform. In this case, the impedance at multiple frequencies can be measured more quickly than a method of measuring impedance at each frequency separately.

[0072] According to an embodiment, the impedance measuring unit (110) can measure the real and imaginary parts of the impedance of the battery for multiple frequencies. As another example, the impedance measuring unit (110) can measure the magnitude and phase of the impedance of the battery for multiple frequencies.

[0073] In operation 420, the memory (120) may store a temperature-impedance imaginary part table according to frequency. For example, the temperature-impedance imaginary part table according to frequency may be measured in advance and stored in the memory (120). According to an embodiment, the temperature-impedance imaginary part table according to frequency may be stored in the memory (120) so as to correspond to each of a plurality of frequencies.

[0074] According to an embodiment, operation 420 may be performed during the manufacturing of the battery temperature estimation device (100) or before performing the operation of estimating the temperature of the battery. That is, operation 420 may be omitted.

[0075] In operation 430, the controller (130) can estimate the temperature of the battery through a temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency. For example, the controller (130) can estimate the temperature of the battery by checking the impedance imaginary part corresponding to the frequency and checking the temperature-impedance imaginary part table corresponding to the frequency.

[0076] FIGS. 5 and 6 are flowcharts specifically illustrating an operating method of a battery temperature estimation device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIGS. 5 and 6 may be performed by the battery temperature estimation device (100) of FIG. 1.

[0077] Referring to FIG. 5, in operation 510, the controller (130) can check the first imaginary part of the impedance corresponding to the first frequency.

[0078] In operation 520, the controller (130) can estimate a first temperature corresponding to a first imaginary part based on a temperature-impedance imaginary part table corresponding to a first frequency.

[0079] In operation 530, the controller (130) can check the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies.

[0080] In operation 540, the controller (130) can estimate the second temperature to the fourth temperature corresponding to the second to fourth imaginary parts based on the temperature-impedance imaginary part table corresponding to the second to fourth frequencies, respectively.

[0081] In operation 550, the controller (130) can estimate the temperature of the battery as an average of the first temperature to the fourth temperature.

[0082] According to an embodiment, without performing operations 530 to 550, the controller (130) may estimate the first temperature as the temperature of the battery.

[0083] According to an embodiment, operations 510 to 550 may be performed as included in operation 430 of FIG. 4.

[0084] Referring to FIG. 6, in operation 610, the controller (130) can check multiple imaginary parts of the impedance corresponding to each of multiple frequencies.

[0085] In operation 620, the controller (130) can estimate a plurality of 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.

[0086] For example, the controller (130) can set n frequencies (n is a natural number) and check n imaginary parts corresponding to each of the n frequencies. In addition, the controller (130) can estimate n temperatures corresponding to the n imaginary parts from each of n temperature-impedance imaginary part tables corresponding to each of the n frequencies, and can estimate the temperature of the battery as an average of the n temperatures.

[0087] In operation 630, the controller (130) may estimate the temperature of the battery based on a plurality of temperatures. For example, the controller (130) may estimate the temperature of the battery as an arithmetic average of the plurality of temperatures.

[0088]

[0089] According to an embodiment, the controller (130) can estimate the temperature of the battery by calculating an average, excluding the highest temperature and the lowest temperature, when there are three or more temperatures.

[0090] According to an embodiment, the controller (130) may estimate the temperature of the battery by calculating the average and deviation of a plurality of temperatures, excluding temperatures whose deviation is greater than a set value, and calculating the average again.

[0091] According to an embodiment, operations 610 to 630 may be performed as included in operation 430 of FIG. 4.

[0092] In an embodiment, the controller (130) can control the battery based on the estimated battery temperature. For example, the controller (130) can calculate the SOX (e.g., SOC, SOH, SOHQ, SOHC, etc.) of the battery based on the estimated battery temperature. For another example, the controller (130) can inform the user of the estimated battery temperature. For another example, the controller (130) can estimate the fire risk of the battery based on the estimated battery temperature, and can inform the user of the estimation result or record it in a log.

[0093] According to an embodiment, the controller (130) may transmit the estimated battery temperature to the upper controller. The upper controller may perform various judgments regarding the battery based on the received battery temperature.

[0094] FIG. 7 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery temperature estimation device according to one embodiment disclosed in this document.

[0095] Referring to FIG. 7, a computing system (1000) according to one embodiment disclosed in the present document may include an MCU (1010), a memory (1020), an input / output I / F (1030), and a communication I / F (1040).

[0096] The MCU (1010) may be a processor that executes various programs (e.g., a battery impedance measurement program, a battery temperature estimation program, etc.) stored in the memory (1020), processes various information including battery impedance, battery temperature, and a battery temperature-impedance imaginary part table through these programs, and performs the functions of the controller included in the battery temperature estimation device shown in the aforementioned FIG. 1.

[0097] The memory (1020) can store various programs, such as a battery impedance measurement program and a battery temperature estimation program. In addition, the memory (1020) can store various information, including battery impedance, battery temperature, and a battery temperature-impedance imaginary part table.

[0098] Such memories (1020) may be provided in multiple numbers as needed. The memories (1020) may be volatile memories or non-volatile memories. As volatile memories (1020), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (1020), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (1020) listed above are merely examples and are not limited to these examples.

[0099] The input / output I / F (1030) can provide an interface that enables data transmission and reception between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (1010).

[0100] The communication I / F (1040) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, a battery temperature estimation device can transmit and receive various information, including battery impedance, battery temperature, and a battery temperature-frequency table, from a separately provided external server via the communication I / F (1040).

[0101] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a module that is recorded in a memory (1020) and processed by an MCU (1010) to perform each function illustrated in FIG. 2, for example.

[0102] The above description is merely an example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0103] Accordingly, the embodiments disclosed in this document are intended to illustrate, rather than limit, the technical concepts disclosed in this document, and the scope of the technical concepts disclosed in this document is not limited by these embodiments. The scope of protection of the technical concepts disclosed in this document should be interpreted by the claims below, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the rights of this document.

[0104] [Explanation of symbols]

[0105] 100: Battery temperature estimation device

[0106] 110: Impedance measurement unit

[0107] 120: Memory

[0108] 130: Controller

[0109] 1000: Computing Systems

[0110] 1010: MCU

[0111] 1020: Memory

[0112] 1030: Input / Output I / F

[0113] 1040: Communication I / F

Claims

1. Impedance measuring unit that measures the impedance of the battery according to frequency; A memory storing a temperature-impedance imaginary part table according to frequency; and A battery temperature estimation device, comprising: a controller for estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency; 2. In paragraph 1, The above controller, Check the first imaginary part of the impedance corresponding to the first frequency, A battery temperature estimation device that estimates a first temperature corresponding to the first imaginary part based on a temperature-impedance imaginary part table corresponding to the first frequency.

3. In paragraph 2, The above controller, Check the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies, Estimate the second temperature to the fourth temperature corresponding to the second imaginary part to the fourth imaginary part based on the temperature-impedance imaginary part table corresponding to each of the second frequency to the fourth frequency, A battery temperature estimation device that estimates the temperature of the battery as an average of the first temperature to the fourth temperature.

4. In paragraph 1, The above memory is, A battery temperature estimation device storing a temperature-impedance imaginary part table for each of a plurality of frequencies.

5. In paragraph 4, The above controller, Check the multiple imaginary parts of the impedance corresponding to each of the multiple frequencies, Estimate multiple temperatures corresponding to each of the multiple imaginary parts based on the temperature-impedance imaginary part table corresponding to each of the multiple frequencies, A battery temperature estimation device that estimates the temperature of the battery based on the above plurality of temperatures.

6. The operation of measuring the impedance of the battery according to frequency; The operation of storing a temperature-impedance imaginary part table according to frequency; and An operating method of a battery temperature estimation device, comprising: an operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance by frequency; 7. In paragraph 6, The operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency is as follows: An operation of checking the first imaginary part of the impedance corresponding to the first frequency; and An operating method of a battery temperature estimation device, comprising: an operation of estimating a first temperature corresponding to the first imaginary part based on a temperature-impedance imaginary part table corresponding to the first frequency; 8. In paragraph 7, The operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency is as follows: An operation of checking the second to fourth imaginary parts of the impedance corresponding to the second to fourth frequencies; An operation of estimating a second temperature to a fourth temperature corresponding to the second imaginary part to the fourth imaginary part based on a temperature-impedance imaginary part table corresponding to each of the second frequency to the fourth frequency; and An operating method of a battery temperature estimation device, comprising: an operation of estimating the temperature of the battery as an average of the first temperature to the fourth temperature; 9. In paragraph 6, The operation of storing the temperature-impedance imaginary part table according to the above frequency is as follows: An operating method of a battery temperature estimation device, wherein a temperature-impedance imaginary part table is stored for each of a plurality of frequencies.

10. In paragraph 9, The operation of estimating the temperature of the battery through the temperature-impedance imaginary part table based on the imaginary part of the impedance for each frequency is as follows: An operation of checking multiple imaginary parts of impedance corresponding to each of multiple frequencies; An operation of estimating a plurality of 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 An operating method of a battery temperature estimation device, comprising: an operation of estimating the temperature of the battery based on the plurality of temperatures;

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