KR20200134580A - Battery diagnostic device and battery diagnostic method thereof - Google Patents

Abstract

The present invention relates to a battery diagnosis device and a battery diagnosis method thereof, and more specifically, to a battery diagnosis device capable of diagnosing deterioration in the output and capacity of a battery, and a battery diagnosis method thereof. The battery diagnosis method of the battery diagnosis device includes the steps of: measuring at least one of a maximum temperature during charging and a maximum temperature during discharging of a battery performing charging or discharging; and calculating the degree of degradation of the battery based on the measured at least one.

Description

Battery diagnostic device and its battery diagnostic method {BATTERY DIAGNOSTIC DEVICE AND BATTERY DIAGNOSTIC METHOD THEREOF}

The present invention relates to a battery diagnosis apparatus and a battery diagnosis method thereof, and more particularly, to a battery diagnosis apparatus capable of diagnosing deterioration in output and capacity of a battery, and a battery diagnosis method thereof.

In general, an energy storage system (ESS) (or energy storage device) refers to a device that charges electrical energy in a battery and then supplies energy to a load when necessary. These energy storage devices are used for the main purposes of smoothing the power peak through charging and discharging, stabilizing the output characteristics of wind and solar light having discontinuous output characteristics, and adjusting the frequency of the power system.

In an energy storage system, a battery for charging electric energy is continuously aged as charging and discharging are repeated, so that capacity gradually decreases and resistance increases. That is, since the battery cannot be used permanently, it must be repaired or replaced before a problem due to aging occurs.

The performance deterioration of the battery used in the energy storage system is the capacity deterioration (Capacity Fade), which decreases capacity due to aging, and the output deterioration (Power Fade), which does not satisfy the rated output required during charging and discharging due to the deterioration of the output characteristics of the battery. ) May be included. The capacity deterioration and output deterioration have a difference in their deterioration mechanism, and the importance may also differ depending on the application field of the energy storage system. In particular, in the case of the energy storage system for frequency adjustment to adjust the frequency of the power system, the output performance of the energy storage system is more important because it must perform instant charging and discharging in a short time, and accordingly, it is necessary to periodically evaluate the output characteristics of the battery. There is.

Conventionally, the diagnosis of performance deterioration for an energy storage system was limited to mainly evaluating capacity deterioration, as shown in FIG. 1, and the output characteristic evaluation of diagnosing output deterioration by measuring the output characteristic of a battery during charging and discharging was performed on the energy storage system. Since it has not been applied to the operation process, a system is required to improve the operational efficiency of the energy storage system by comprehensively evaluating capacity degradation and output degradation.

The background technology of the present invention is disclosed in Korean Registered Patent Publication No. 10-1922478 (published on November 27, 2018).

It is an object of the present invention to solve the above and other problems.

An object of the present invention is to provide a battery diagnosis apparatus capable of measuring at least one of deterioration in capacity and deterioration in output of a battery in-situ during charging and discharging of a battery, and a battery diagnosis method thereof.

The present invention provides a battery diagnostic device and a battery diagnostic method thereof.

The battery diagnostic method includes measuring at least one of a maximum temperature during charging and a maximum temperature during discharging of a battery that performs charging or discharging; And calculating a degree of degradation of the battery based on the measured at least one.

According to an embodiment, the battery diagnosis method further includes selecting one of a plurality of lookup tables based on an operating environment of the battery, wherein the measured at least one is added to the selected lookup table. By applying it, the degree of degradation of the battery can be calculated.

According to an embodiment, the measuring of the at least one may include monitoring a surface temperature of the battery; Selecting a highest temperature among temperatures measured while charging the battery as the highest temperature during charging; And selecting the highest temperature among temperatures measured while discharging the battery as the highest temperature during discharging.

According to an embodiment, the battery includes a plurality of cells, the temperature of each of the plurality of cells is measured, and at least one of capacity deterioration and output deterioration of each cell may be calculated in real time.

According to an embodiment, the battery diagnosis method includes calculating an average value and a standard deviation of temperatures measured in each cell; Searching for a cell of the plurality of cells unless the reference condition is satisfied based on the reference condition set by the average value and the standard deviation; And outputting guide information guiding the abnormal cell in at least one of a visual method, an auditory method, and a tactile method.

According to an embodiment, even when the maximum temperature during the discharge is the same, the degree of deterioration of the battery may be calculated differently according to the operating environment of the battery.

According to an embodiment, the degree of deterioration of the battery may include at least one of discharge capacity, capacity retention, depth of discharge, capacity deterioration, and output deterioration.

In addition, the battery diagnosis apparatus may include a measuring unit that measures a temperature of a battery for charging or discharging; And a controller configured to measure at least one of a maximum temperature during charging and a maximum temperature during discharge using the measurement unit, and calculate a degree of degradation of the battery based on the measured at least one.

According to an embodiment, the control unit selects one of a plurality of lookup tables based on the operating environment of the battery, and applies the measured at least one to the selected lookup table to deteriorate the battery. Degree can be calculated.

According to an embodiment, the controller selects a highest temperature among temperatures measured while charging the battery as the highest temperature during charging, and sets the highest temperature among temperatures measured while discharging the battery as the highest temperature during discharge. Can be selected as.

According to an embodiment, the battery includes a plurality of cells, the temperature of each of the plurality of cells is measured, and at least one of capacity deterioration and output deterioration of each cell may be calculated in real time.

According to an embodiment, the control unit calculates an average value and a standard deviation of temperatures measured in each cell, and satisfies the reference condition based on a reference condition set by the average value and the standard deviation of the plurality of cells. Unless otherwise specified, a cell is searched, and guide information guiding the abnormal cell may be output in at least one of a visual method, an auditory method, and a tactile method.

The present invention includes the battery diagnosis apparatus according to the above embodiment, and can provide an electric vehicle that runs using power of a battery.

The effect of the battery diagnosis apparatus and the battery diagnosis method according to the present invention will be described as follows.

According to the present invention, the battery diagnosis device and its control method do not depend on the state of health (SOH) calculated by the battery management system (BMS), and determine the degree of degradation by using the directly measured temperature value. Therefore, it is possible to directly diagnose and judge safety and performance. In addition, it is possible to predict and manage an abnormality in the entire battery system.

When the present invention is applied to an electric vehicle or the like, it is possible to periodically monitor the degree of deterioration of the entire battery system while driving. If the reliability of the degree of degradation (SOH) measured by the battery management system is low, it can be used as comparative information. In the case of battery fire and burnout accidents, there are various causes, but there is a possibility that an accident may occur due to deterioration of the battery cells. Can be prevented.

Since it is possible to measure and analyze not only the degree of deterioration of the entire battery system, but also of individual cells, it is possible to optimize battery maintenance cycles and units, and minimize replacement units when replacement is required.

If the deterioration degree of each battery cell is indicated on the energy storage device operation system, electric vehicle charger, or operator screen, it can be efficiently used for status check, maintenance, and replacement.

1 is an exemplary view for explaining capacity degradation of a conventional battery.
2 is an experimental graph for explaining the correlation between the discharge capacity and temperature of the battery.
3 is a diagram illustrating a discharge capacity and a maximum temperature of a surface of a battery cell during charging/discharging as an example of experimental data shown in the experiment graph of FIG. 2.
4 is a block diagram illustrating a battery diagnosis apparatus according to an embodiment of the present invention.
5 is a flowchart illustrating a battery diagnosis method of a battery diagnosis apparatus according to an embodiment of the present invention.
6 is an exemplary view illustrating an electric vehicle equipped with a battery diagnosis apparatus according to the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Electric vehicle batteries or energy storage batteries gradually shorten their usage time due to deterioration due to an increase in internal resistance as the charge/discharge usage time increases. In the prior art, capacity degradation is mainly measured as shown in FIG. 1 in order to measure the lifetime degradation of the energy storage system. In the case of measuring capacity deterioration, there is a problem that the inspection must be performed periodically, and the test time is excessively required during the inspection. In addition, the method of measuring the internal resistance takes a short time compared to the method of measuring the capacity directly, but there is a problem in that a separate test must be performed.

In particular, according to the prior art, since it is not possible to measure the degree of deterioration of individual unit cells constituting the battery system, maintenance costs such as having to replace the entire system during maintenance are excessive, and the replacement unit can be minimized. There is no problem.

Here, the capacity deterioration means that the capacity of the battery (or cell) is deteriorated and the capacity is reduced.

According to the method disclosed in Korean Patent Publication No. 10-1922478 (hereinafter referred to as "conventional technology"), it is possible to measure the internal resistance and output characteristics of the entire battery system by charging and discharging by applying a pulse current or power. I can. In addition, the degree of deterioration can be evaluated by measuring the internal resistance by using the voltage and current data of the battery system or individual cells through the charge/discharge test, or the degree of deterioration by using a reduction in the amount of charge or discharge using the charge/discharge amount. I can.

According to the prior art, since the amount of reduction in discharge capacity is measured through a periodic charge/discharge test, capacity degradation can be measured, but output degradation cannot be measured directly. Furthermore, the degree of deterioration during the operation of the energy storage system or electric vehicle cannot be estimated in-situ, and a separate test is required. In the case of using the charge/discharge amount, there is a disadvantage of low accuracy because the charge/discharge energy is equalized and estimated. .

On the other hand, since the battery system is affected by temperature during operation, it acquires temperature data along with voltage and current, but does not use it for battery condition diagnosis.

The present invention provides a new type of battery diagnostic device capable of measuring the degree of deterioration of a battery (or cell) using a surface temperature of a battery (or cell) and a battery diagnostic method thereof.

The calorific value of the battery cell can be expressed by [Equation 1].

The voltage change amount is larger as the internal resistance increases, so the internal resistance, which is a direct indicator of deterioration, has a value in direct proportion to the temperature change.

FIG. 2 is an experimental graph for explaining the correlation between the discharge capacity and temperature of the battery, and FIG. 3 is an example of the experimental data shown in the experiment graph of FIG. 2, showing the discharge capacity and the maximum temperature of the surface of the battery cell during charging/discharging. It is a drawing showing.

2 and 3 show experimental results comparing the maximum temperature and discharge capacity of the surface of the battery (or cell) during charging and discharging while performing a cycle experiment up to 2400 cycles in a 25°C environment.

One charge and one discharge occur in one cycle.

As the cycle progressed, it was confirmed that the battery capacity (Battery Capacity, or discharge capacity) decreased, and the maximum temperature during charging (T_Ch) and the maximum temperature during discharge (T_Disch) increased. Furthermore, it was confirmed that as the cycle increased, the temperature increase during discharge was greater than the temperature increase during charging.

For example, referring to FIG. 3, in the first cycle in a 25° C. environment, the maximum temperature during charging was 30.1° C., the maximum temperature during discharge was 31.37° C., and the discharge capacity was 100%. Thereafter, in the 2400th cycle, the maximum temperature during charging was 33.309°C, the maximum temperature during discharge was 39.90°C, and the discharge capacity was 53%.

The battery diagnostic device can estimate the discharge capacity of the battery by monitoring the maximum temperature during charging or discharging,

The energy storage system (ESS) operates at a constant temperature using an air conditioner and can set various temperatures (20°C, 25°C, 28°C, etc.) according to the situation. Accordingly, the battery diagnosis apparatus may calculate the degree of deterioration of the battery by using the temperature increase (when charging or discharging) at the temperature at which the battery is operated.

A lookup table at various temperatures may be stored in the memory of the battery diagnosis apparatus. For example, the maximum temperature during charging, the maximum temperature during discharge, and the corresponding discharge capacity of the battery shown in FIG. 3 are stored in the first lookup table, and the maximum temperature during charging and the maximum temperature during discharge at 28°C. , The discharge capacity of the battery corresponding thereto may be stored in the second lookup table.

The battery diagnosis apparatus may select one of a plurality of lookup tables based on a temperature at which the battery is operated, and estimate a discharge capacity of the battery using the selected lookup table. For example, if the maximum temperature when discharging in a 25°C environment is 38.20°C, the battery diagnostic apparatus may estimate that the discharge capacity of the battery is 65% based on the first lookup table shown in FIG. 3.

Furthermore, since the above [Equation 1] shows a direct correlation between the deterioration of the battery and the temperature, the battery deterioration during operation by acquiring the battery temperature measurement data on the battery management system (BMS) when operating the battery system. Degree can be measured directly.

4 is a block diagram illustrating a battery diagnosis apparatus 1 according to an embodiment of the present invention.

Referring to FIG. 4, a battery diagnosis apparatus according to an embodiment of the present invention may include a battery 10, a battery management unit 20, a power conversion unit 30, a measurement unit 40, and a control unit 50. have.

The battery 10 refers to a secondary battery that is provided with a positive electrode plate and a negative electrode plate and is capable of charging and discharging through a chemical action, and a lithium battery, a sodium-sulfur battery, and a redox flow battery ), a nickel-cadmium battery (Ni-Cd Battery), or a super capacitor, but is not limited thereto. In addition, the battery may include all of a unit cell, a module, a rack, and a system level battery as described above.

The battery management unit 20 is connected to the battery 10 and obtains battery state information including voltage, current, temperature, and state of charge (SOC) of the battery 10 to be described later. Can be delivered to. The battery management unit 20 may be implemented as a battery management system (BMS) provided in the energy storage system and monitoring the state of the battery 10.

The power conversion unit 30 converts AC power from a power generation source into DC power and stores it in the battery 10, or converts DC power from the battery 10 into AC power and supplies it to the power system, thereby converting power. Through this, it may serve to provide compatibility between the power system and the battery 10. In this embodiment, the power conversion unit 30 is controlled by the control unit 50 to discharge and charge the battery 10, and accordingly, as described later, the current in a preset pulse pattern is applied to the battery 10 The battery 10 can be discharged or charged by drawing from or supplying it to the battery 10. Meanwhile, the power conversion unit 30 may be implemented as a power conversion device (PCS: Power Conditioning System) provided in an energy storage system.

When the battery 10 is discharged and charged by the power converter 30, the measurement unit 40 may measure at least one of a voltage, a current, and a temperature during discharge and charge, and transmit the measurement to the control unit 50. .

The control unit 50 controls the power conversion unit 30 to discharge and charge the battery 10, based on the temperature of the battery 10 measured by the measurement unit 40 when the battery 10 is discharged and charged. At least one of deterioration in capacity and deterioration in output of the battery 10 may be diagnosed.

5 is a flowchart illustrating a battery diagnosis method of a battery diagnosis apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the controller 50 measures the temperature of the battery during charging or discharging by using the measuring unit 40 (S510).

The temperature measured by the measurement unit 40 is measured in real time and may be stored in a memory (not shown). The control unit 50 may selectively store the highest temperature among temperatures measured during charging or discharging in the memory. If only the highest temperature is stored, the memory is used efficiently.

The controller 50 may store a maximum temperature measured during a first charging of the battery as the first temperature, and may store a maximum temperature measured during a second charging of the battery as the second temperature. Here, the second charge may be a charge after the first charge is discharged.

Charging and discharging cannot be done together and circulate. For example, the first charge, the first discharge, the second charge, the second discharge, the third charge ... may be made in the order of the nth charge and the nth discharge. The controller 50 may store the highest temperature in the first charging as the first charging temperature, and store the highest temperature in the n-th charging as the n-th charging temperature. In the same way, the highest temperature in the first discharge may be stored as the first discharge temperature, and the highest temperature in the n-th discharge may be stored as the n-th discharge temperature.

The control unit 50 may calculate the degree of degradation of the battery based on the measured at least one (S530).

The degree of deterioration of the battery may include at least one of discharge capacity, capacity retention, depth of discharge, capacity deterioration, and output deterioration.

The controller 50 may select any one of a plurality of lookup tables stored in a memory (not shown) based on an operating environment of the battery 10.

As shown in FIG. 3, the lookup table may be composed of a plurality of records in which a maximum temperature during charging, a maximum temperature during discharge, and a degree of deterioration of a battery corresponding thereto are set as one record based on a specific operating environment. A plurality of lookup tables having different records may be stored in a memory according to an operating environment.

The battery management unit 20 may operate the air conditioning system so that the operating environment is set to a preset state. For example, the operating environment of the battery 10 may be set to 25°C.

The control unit 50 may check the operating environment of the battery 10 through the battery management unit 20 and select one of the lookup tables corresponding thereto. For example, if the operating environment of the battery 10 satisfies the first condition, the first lookup table may be selected, and if the second condition is satisfied, the second lookup table may be selected.

The control unit 50 may calculate the degree of deterioration of the battery 10 by applying the maximum temperature at the time of charging and/or the maximum temperature at the time of discharge measured by the measurement unit 40 to the selected lookup table. For example, if the maximum temperature during discharging in a state in which the operating environment of the battery 10 is 25° C. is 35.97° C., the controller 50 may calculate that the discharge capacity of the battery is 78%.

The controller 50 may estimate the discharge capacity of the battery by using records included in the lookup table. For example, as shown in FIG. 3, eight records may be included in one lookup table. The controller 50 may generate a function that uses the records included in the lookup table to use the maximum temperature during charging and/or the maximum temperature during discharge as variables. By substituting the temperature measured through the measurement unit 40 into the function, a result value that is not in the lookup table can be derived.

The function may be, for example, a one-dimensional function of the form y = ax + b, or may be a high-dimensional function. Here, y is the discharge capacity of the battery, and x may be the highest temperature during discharge or the highest temperature during charging.

For example, if the maximum temperature during discharge in a state in which the operating environment of the battery 10 is 25° C. is 35.00° C., the control unit 50 may calculate the discharge capacity of the battery 10 as 83.24%. The function used at this time is generated by records corresponding to the 900th cycle and the 1200th cycle, and may be y=-5.46x + 274.3356.

Since different lookup tables are selected according to the operating environment, even when the maximum temperature is the same during the discharge, the degree of degradation of the battery may be calculated differently according to the operating environment of the battery.

When the lookup table corresponding to the operating environment managed by the battery management unit 20 is not stored in the memory, the control unit 50 may request a specific lookup table from the server through another communication device. By updating the lookup table through the server, it is possible to perform customized diagnosis suitable for the battery operating environment.

Meanwhile, the control unit 50 may calculate at least one of capacity degradation and output degradation of the battery by using a temperature change between the first temperature measured at the first time point and the second temperature measured at the second time point. .

More specifically, the control unit 50 calculates the resistance value of the battery by applying the first temperature and the second temperature to the above-described [Equation 1], and deteriorates the capacity of the battery based on the resistance value of the battery. And at least one of output deterioration may be calculated.

The battery includes a plurality of cells, the temperature of each of the plurality of cells is measured, and at least one of deterioration in capacity and deterioration in output of each cell may be calculated in real time.

In this case, the control unit 50 may calculate an average value and a standard deviation of the temperatures measured in each cell. Further, the cells may be searched for as long as the reference condition is not satisfied based on the reference condition set by the average value and the standard deviation of the plurality of cells. For example, cells that satisfy the reference condition may be classified as normal cells, and cells that do not satisfy the reference condition may be classified as abnormal cells.

The controller 50 may output guide information guiding the abnormal cell in at least one of a visual method, an auditory method, and a tactile method.

6 is an exemplary view illustrating an electric vehicle equipped with a battery diagnosis apparatus according to the present invention.

When at least one of a plurality of cells constituting a battery becomes an abnormal cell according to the reference condition, the battery diagnosis apparatus 1 may output guide information guiding the abnormal cell. For example, as shown in FIG. 6, information for guiding an abnormal cell among a plurality of cells may be guided through a display provided in the vehicle. Since a cell in which deterioration has occurred can be specified only by a measuring unit that measures temperature, there is an effect of real-time detection of abnormal cells at low cost.

According to the present invention, the battery diagnosis device and its control method do not depend on the state of health (SOH) calculated by the battery management system (BMS), and determine the degree of degradation by using the directly measured temperature value. Therefore, it is possible to directly diagnose and judge safety and performance. In addition, it is possible to predict and manage an abnormality in the entire battery system in advance.

When the present invention is applied to an electric vehicle or the like, it is possible to periodically monitor the degree of deterioration of the entire battery system while driving. If the reliability of the degree of degradation (SOH) measured by the battery management system is low, it can be used as comparative information. In the case of battery fire and burnout accidents, there are various causes, but there is a possibility that an accident may occur due to deterioration of the battery cells. Can be prevented.

Since it is possible to measure and analyze not only the degree of deterioration of the entire battery system, but also of individual cells, it is possible to optimize battery maintenance cycles and units, and minimize replacement units when replacement is required.

If the deterioration degree of each battery cell is indicated on the energy storage device operation system, electric vehicle charger, or operator screen, it can be efficiently used for status check, maintenance, and replacement.

The present invention described above can be implemented as computer-readable code (or application or software) on a medium in which a program is recorded. The above-described method of controlling an autonomous vehicle may be realized by a code stored in a memory or the like.

The computer-readable medium includes all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include HDD (Hard Disk Drive), SSD (Solid State Disk), SDD (Silicon Disk Drive), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is also a carrier wave (e.g., transmission over the Internet). Also, the computer may include a processor or a control unit. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

10: battery
20: battery management unit
30: power conversion unit
40: measurement unit
50: control unit

Claims (15)

Measuring at least one of a maximum temperature during charging and a maximum temperature during discharge of a battery that performs charging or discharging; And
And calculating a degree of degradation of the battery based on the measured at least one. The method of claim 1,
Further comprising the step of selecting one of a plurality of lookup tables based on the operating environment of the battery,
And calculating the degree of degradation of the battery by applying the measured at least one to the selected lookup table. The method of claim 1,
The step of measuring the at least one,
Monitoring the surface temperature of the battery;
Selecting a highest temperature among temperatures measured while charging the battery as the highest temperature during charging; And
And selecting a highest temperature from among temperatures measured while discharging the battery as the highest temperature upon discharging. The method of claim 1,
The battery is composed of a plurality of cells, the temperature of each of the plurality of cells is measured, and at least one of deterioration in capacity and output deterioration of each cell is calculated in real time. The method of claim 4,
Calculating an average value and a standard deviation of the temperatures measured in each cell;
Searching for at least one abnormal cell that does not satisfy the reference condition based on a reference condition set by the average value and the standard deviation of the plurality of cells; And
And outputting guide information guiding the abnormal cell in at least one of a visual method, an auditory method, and a tactile method. The method of claim 1,
The battery diagnosis method, characterized in that the degree of degradation of the battery is calculated differently according to an operating environment of the battery even when the maximum temperature during the discharge is the same. The method of claim 1,
The battery diagnosis method, wherein the degree of degradation of the battery includes at least one of a discharge capacity, a capacity retention, a depth of discharge, a capacity degradation, and an output degradation. A measuring unit measuring a temperature of a battery for charging or discharging;
And a controller configured to measure at least one of a maximum temperature during charging and a maximum temperature during discharge using the measurement unit, and calculate a degree of degradation of the battery based on the measured at least one. The method of claim 8,
The control unit,
Battery diagnosis, characterized in that, based on the operating environment of the battery, a lookup table is selected from among a plurality of lookup tables, and the degree of degradation of the battery is calculated by applying the measured at least one to the selected lookup table. Device. The method of claim 9,
The control unit,
Battery diagnosis apparatus, characterized in that the highest temperature among temperatures measured while charging the battery is selected as the highest temperature during charging, and the highest temperature among temperatures measured while discharging the battery is selected as the highest temperature upon discharging . The method of claim 8,
The battery is made of a plurality of cells, the temperature of each of the plurality of cells is measured, and at least one of deterioration of capacity and output of each cell is calculated in real time. The method of claim 11,
The control unit,
Calculate the average value and standard deviation of the temperature measured in each cell,
Searching for a cell from the plurality of cells unless the reference condition is satisfied based on a reference condition set by the average value and the standard deviation,
And outputting guide information guiding the abnormal cell in at least one of a visual method, an auditory method, and a tactile method. The method of claim 8,
The battery diagnosis method, characterized in that the degree of degradation of the battery is calculated differently according to an operating environment of the battery even when the maximum temperature during the discharge is the same. The method of claim 8,
The battery diagnosis method, wherein the degree of degradation of the battery includes at least one of a discharge capacity, a capacity retention, a depth of discharge, a capacity degradation, and an output degradation. An electric vehicle comprising the battery diagnosis device of claim 10 and running using power of a battery.

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