Battery performance evaluation system and method thereof

Abstract

The present invention relates to a battery performance evaluation system (1) and a method thereof (S1) and, more specifically, to a battery performance evaluation system (1) and method (S1), which performs calculations of data acquired from a battery management system (BMS) according to preconfigured references (or algorithms) to obtain a final performance score, and displays the final performance score on a display unit of a user terminal (50), thus enabling intuitive determination of current battery information.

Description

Battery performance evaluation system and method thereof

[0001] The present invention relates to a battery performance evaluation system (1) and a method (S1) thereof, and more particularly, to a battery performance evaluation system (1) and a method (S1) thereof that enables intuitive judgment of current battery information by displaying a final performance score calculated according to a set standard (or algorithm) using data acquired from a BMS (Battery Management System) (hereinafter referred to as “BMS data”) on a display unit of a user terminal (50).

[0002] Secondary batteries, which are easily applicable across a wide range of product groups and possess electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electrical power sources. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can reduce fossil fuel use but also because they produce no byproducts from energy use.

[0003] Additionally, the use of battery packs containing multiple unit battery modules has been increasing recently. Specifically, battery packs contain multiple electrically connected battery modules and are used in electric vehicles (EVs) and hybrid electric vehicles (HEVs), which require relatively large electrical capacities. In particular, with the increasing demand for electric vehicles, the amount of waste batteries generated after scrapping vehicles is increasing exponentially.

[0004] After evaluating the performance of electric vehicle waste batteries to determine their residual value, those with good performance are reused in ESS or used as raw materials for after-sales service. Those with poor performance are completely discharged, shredded, and recycled to extract rare metals.

[0005] To recycle these waste or used batteries, a quick and accurate assessment of their current condition is essential.

[0006]

[0007] To this end, the inventor of the present invention proposes a battery performance evaluation system and method that enables rapid and accurate evaluation of the current state of a battery simply by operating an app through a user terminal, while also enabling intuitive recognition of the overall results. Details will be described later.

[0008]

[0009] (Prior art literature)

[0010] Domestic Patent Publication No. 10-2023-0088644, "Simple Battery Performance Diagnosis Device and Operating Method for Diagnosing Battery Performance in Electric Vehicles."

[0011]

[0012] It was devised to solve the problems of the prior art mentioned above.

[0013]

[0014] The purpose of the present invention is to provide a battery performance evaluation system and method that enable intuitive judgment of current battery information by displaying a battery final performance score calculated according to a set algorithm using BMS data on a display unit of a user terminal.

[0015] In addition, the present invention aims to provide a battery performance evaluation system and method that enable accurate performance evaluation through correction for battery packs under different conditions by deriving an SOH correction value by correcting the SOH value among BMS data according to the battery pack temperature.

[0016] In addition, the present invention aims to provide a battery performance evaluation system and method that enable more precise performance evaluation by calculating aging based on battery cell voltage when evaluating current battery pack performance and deriving a final performance score together with an SOH correction value.

[0017] In addition, the present invention aims to provide a battery performance evaluation system and method that enable a user to easily identify a current defective cell by displaying defective battery cells, the number of such cells, and the corresponding cell voltage on a display unit of a user terminal.

[0018] In addition, the present invention aims to provide a battery performance evaluation system and method that take into account the cumulative number of times a battery has been charged when deriving a final battery performance score, thereby also taking into account performance deterioration due to charging of the battery.

[0019] In addition, the present invention aims to provide a battery performance evaluation system and method that enable users to easily obtain information on battery performance through a portable terminal such as a smartphone by installing and running a related app on the user terminal and utilizing the system.

[0020]

[0021] In order to achieve the above-described purpose, the present invention can be implemented by an embodiment having the following configuration.

[0022]

[0023] According to one embodiment of the present invention, a battery performance evaluation system according to the present invention is characterized by including: a battery pack including a BMS; a CDS that communicates with the BMS of the battery pack to acquire BMS data; a user terminal that accesses a server to acquire battery status information through the BMS data acquired from the CDS; and a server that generates battery-related information and / or battery status information through the BMS data acquired through the CDS or the user terminal.

[0024] According to another embodiment of the present invention, the server in the battery performance evaluation system according to the present invention is characterized by including a data calculation unit that generates battery-related information through the BMS data; and a performance evaluation unit that derives the final performance of the current battery based on the battery-related information generated through the data calculation unit.

[0025] According to another embodiment of the present invention, the data calculation unit in the battery performance evaluation system according to the present invention is characterized by including an SOH correction module that calculates an SOH correction value by correcting the SOH value among BMS data by taking into consideration the battery pack temperature.

[0026] According to another embodiment of the present invention, the data calculation unit in the battery performance evaluation system according to the present invention is characterized by including an aging calculation module that calculates the aging of the battery by comparing the voltage of a new battery cell corresponding to the battery cell to be evaluated with the voltage of the current battery cell among BMS data.

[0027] According to another embodiment of the present invention, the data calculation unit in the battery performance evaluation system according to the present invention is characterized by further including a voltage drop value calculation module that calculates a voltage drop value by comparing the voltage of the new battery cell and the voltage of the current battery cell.

[0028] According to another embodiment of the present invention, the data operation unit in the battery performance evaluation system according to the present invention includes a defective cell specification module that specifies a defective battery cell among a plurality of current battery cells in the battery pack, and the defective cell specification module is characterized in that it specifies a defective cell when an individual battery cell voltage exceeds a preset value from the current battery cell average voltage.

[0029] According to another embodiment of the present invention, the data calculation unit in the battery performance evaluation system according to the present invention includes an accumulated charge count calculation module that charges the accumulated charge count of the current battery; and the accumulated charge count calculation module is characterized in that it calculates the accumulated charge count based on the accumulated charge power amount among BMS data and the capacity of the battery pack.

[0030] According to another embodiment of the present invention, the data calculation unit in the battery performance evaluation system according to the present invention includes an SOH correction module that calculates an SOH correction value by correcting an SOH value among BMS data in consideration of a battery pack temperature; an aging calculation module that calculates a degree of aging of the battery by comparing a new battery cell voltage corresponding to a battery cell to be evaluated with a voltage of a current battery cell among BMS data; a voltage drop calculation module that calculates a voltage drop value by comparing the voltage of the new battery cell with the voltage of the current battery cell; a defective cell identification module that identifies a defective battery cell through a cell voltage deviation value among a plurality of current battery cells in the battery pack; and an accumulated charge count calculation module that charges a cumulative charge count of the current battery; wherein the performance evaluation unit is characterized in that it derives the final performance of the current battery pack based on at least one piece of information from among the SOH correction value, the degree of aging of the battery, the voltage drop value, the cell voltage deviation value, and the accumulated charge count.

[0031] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention is characterized by including a primary performance evaluation module that calculates a primary performance score of the current battery pack by taking into account the battery aging degree and the score assigned to the SOH correction value.

[0032] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention is characterized by further including a final performance evaluation module that calculates a final performance score of the current battery by utilizing at least one of a score assigned to a voltage drop value, a score assigned to a cell voltage deviation value, and a score assigned to a cumulative number of charges in addition to the first performance score.

[0033] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention is characterized by further including a grade assignment module that assigns a grade to the battery so as to match the final performance score of the current battery.

[0034] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention further includes a performance result provision unit that displays battery status information on a display unit of a user terminal connected to a server by operating an app; and the performance result provision unit includes a performance indicator provision module that displays information on the final performance score of the battery and the total number of defective battery cells on the display unit.

[0035] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention further includes a performance result provision unit that displays battery status information on a display unit of a user terminal connected to a server by operating an app; and the performance result provision unit is characterized in that it includes a defective cell data provision module that displays, on the display unit, a cell voltage corresponding to the cell number along with the cell number of each defective battery cell.

[0036] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention further includes a performance result provision unit that displays battery status information on a display unit of a user terminal connected to a server by operating an app; and the performance result provision unit includes an accumulated charge / discharge power data provision module that displays the accumulated charge power amount and accumulated discharge power amount of the battery by day on the display unit.

[0037] According to another embodiment of the present invention, the performance evaluation unit in the battery performance evaluation system according to the present invention further includes a performance result provision unit that displays battery status information on a display unit of a user terminal connected to a server by operating an app; and the performance result provision unit includes an individual cell voltage data provision module that displays information on individual cell voltages of a plurality of battery cells included in a current battery pack on the display unit.

[0038]

[0039] The present invention has the following effects through the above-mentioned configuration.

[0040]

[0041] The present invention has the effect of enabling intuitive judgment of current battery information by displaying the final battery performance score calculated according to a set algorithm using BMS data on a display unit of a user terminal.

[0042] In addition, the present invention has the effect of enabling accurate performance evaluation through correction for battery packs under different conditions by deriving an SOH correction value by correcting the SOH value among BMS data according to the battery pack temperature.

[0043] In addition, the present invention has the effect of enabling more precise performance evaluation by calculating aging based on battery cell voltage when evaluating the performance of a current battery pack and deriving a final performance score together with an SOH correction value.

[0044] In addition, the present invention has the effect of enabling the user to easily identify the current defective cell by displaying the defective battery cell, the number of the corresponding cells, and the corresponding cell voltage on the display unit of the user terminal.

[0045] In addition, the present invention has the effect of considering the cumulative number of times a battery is charged when deriving the final performance score of the battery, thereby also considering the performance deterioration due to charging of the battery.

[0046] In addition, the present invention has the effect of enabling users to easily obtain information on battery performance through portable terminals such as smartphones by installing and running a related app on the user terminal and enabling its use.

[0047]

[0048] Meanwhile, even if the effect is not explicitly mentioned herein, it is added that the effect and its provisional effect described in the following specification expected by the technical features of the present invention are treated as described in the specification of the present invention.

[0049]

[0050] FIG. 1 is a conceptual diagram of a battery performance evaluation system according to one embodiment of the present invention;

[0051] FIG. 2 is a block diagram of a server according to FIG. 1;

[0052] FIG. 3 is a block diagram of a data operation unit according to FIG. 2;

[0053] FIG. 4 is a block diagram of a performance evaluation unit according to FIG. 2;

[0054] FIG. 5 is an exemplary reference diagram for the first table stored in the DB according to FIG. 2;

[0055] FIG. 6 is an exemplary reference diagram for a second table stored in a DB according to FIG. 2;

[0056] FIG. 7 is an exemplary reference diagram for a third table stored in the DB according to FIG. 2;

[0057] FIG. 8 is an exemplary reference diagram for the fourth table stored in the DB according to FIG. 2;

[0058] FIG. 9 is an exemplary reference diagram for the fifth table stored in the DB according to FIG. 2;

[0059] Fig. 10 is a block diagram of a performance result providing unit according to Fig. 2;

[0060] FIG. 11 is a reference diagram for a user terminal display unit driven by a performance indicator provision module, a BMS data provision module, and a defective cell data provision module according to FIG. 10;

[0061] FIG. 12 is a reference diagram for a user terminal display unit driven by a battery pack temperature data provision module according to FIG. 10;

[0062] Fig. 13 is a reference diagram for a user terminal display unit driven by a cumulative charge / discharge power data provision module according to Fig. 10;

[0063] FIG. 14 is a reference diagram for a user terminal display unit driven by an individual cell voltage data provision module according to FIG. 10;

[0064] FIG. 15 is a flowchart of a battery performance evaluation method according to one embodiment of the present invention;

[0065] FIG. 16 is a flowchart of step S10 according to FIG. 15;

[0066] Fig. 17 is a flowchart of step S30 according to Fig. 15.

[0067]

[0068] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. The embodiments of the present invention may be modified in various ways, and the scope of the present invention should not be construed as limited to the embodiments described below, but rather should be interpreted based on the claims. Furthermore, these embodiments are provided for reference only to more fully explain the present invention to those of ordinary skill in the art.

[0069] Additionally, it should be noted that, where a particular embodiment can be implemented differently, a particular process sequence may be performed differently from the order described below. For example, two processes described sequentially may be performed substantially simultaneously or in the opposite order.

[0070]

[0071] FIG. 1 is a conceptual diagram of a battery performance evaluation system according to one embodiment of the present invention.

[0072]

[0073] Hereinafter, a battery performance evaluation system (1) according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0074]

[0075] Referring to FIG. 1, the present invention relates to a battery performance evaluation system (1), and more specifically, to a battery performance evaluation system (1) that enables intuitive judgment of current battery information by displaying the final performance score calculated according to a set standard (or algorithm) using data acquired from a BMS (Battery Management System) (hereinafter referred to as “BMS data”) on a display unit of a user terminal (50).

[0076] To this end, the battery performance evaluation system (1) may include a battery pack (10), a CDS (Component Diagnostics Solution), a user terminal (50), and a server (70).

[0077] The battery pack (10) is a configuration equipped with a BMS for battery management, and includes batteries having an ESS used in electric vehicles, unmanned transport vehicles, etc. This battery pack (10) may be, for example, a vehicle battery and may be a means of supplying power necessary to start the engine of an electric vehicle. The electric vehicle may include a pure electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a fuel cell electric vehicle (FCEV), etc.

[0078] The battery pack (10) includes a plurality of battery modules, and each battery module may include a plurality of battery cells. For example, each battery module may include dozens of battery cells. The plurality of battery modules may be connected in series and / or parallel to form a battery pack. Hereinafter, the term "battery" may refer to either a battery pack or a battery cell, depending on the context.

[0079] In addition, the battery pack (10) may be a battery pack installed in an electric vehicle or a used battery pack removed from the electric vehicle. BMS data from the battery pack (10) may be collected by the CDS (30) described below. At this time, the CDS (30) communicates with the BMS through a dedicated cable connected to the OBD (On Board Diagnostics)-2 port, for example, in order to connect with the battery pack (10) installed in the electric vehicle, and in the case of a battery pack (10) removed from the electric vehicle, they may be directly connected to each other.

[0080] The CDS (30) is configured to acquire battery-related information through communication with the BMS of the battery pack (10) and then transmit it to the user terminal (50) and / or server (70). This CDS (30) may be configured to enable, for example, CAN (CANFD) communication or serial communication with the BMS. The 'BMS data' acquired through the CDS (30) may be any one or more pieces of information from among SOH (State Of Health), SOC (State Of Cell), SOB (State Of Balance), battery cell voltage, battery cell temperature, number of slow charges, number of rapid charges, cumulative charge / discharge power, cumulative charge / discharge current, insulation resistance, internal resistance, etc., and it should be noted that the scope of the present invention is not limited by a specific example. This CDS (30) can acquire the BMS data from the BMS when it receives a BMS data acquisition command from the display of the user terminal (50) on which the related app is running.

[0081] The user terminal (50) is configured to connect to the server (70) to obtain battery status information through BMS data acquired by the user. The user terminal (50) may include any of various known or to-be-known configurations, such as a desktop, laptop, or smartphone, and the scope of the present invention is not limited by any specific means / device.

[0082] For example, if the user terminal (50) is a smartphone, the battery status information can be obtained by installing a related application (APPlication; APP) and then running it to access the server (70). Alternatively, if the user terminal (10) is a desktop, the battery status information can be obtained by accessing a related webpage and then accessing the server (70). The user terminal (50) can be configured to enable wired or wireless communication with the CDS (30). The term 'battery status information' may be any one or more of a plurality of pieces of information provided from the performance result provision unit (750) described below.

[0083]

[0084] Figure 2 is a block diagram of a server according to Figure 1.

[0085]

[0086] Referring to FIGS. 1 and 2, the server (70) is configured to generate battery-related information and / or battery status information through BMS data acquired through CDS (30) or user terminal (50), and for this purpose, may include a data operation unit (710), a performance evaluation unit (730), a performance result provision unit (750), and a DB (790).

[0087] The DB (790) of the server (70) stores one or more 'related basic information' such as vehicle manufacturer, vehicle type / year, number of cells by vehicle type and year, development name, whether PHEV / EV / hybrid / FCV, whether urban / basic model, whether rear-wheel / four-wheel drive, vehicle production year, total voltage, battery capacity, power, maximum output charge / discharge voltage, discharge end voltage, current limit, internal resistance value, battery pack size, etc., and it is preferable that the corresponding related basic information is also stored in the related app. The server (70) may be configured to enable wired or wireless communication with the user terminal (50). The term 'battery-related information' may be one or more of a plurality of pieces of information provided by the data operation unit (710) and / or the performance evaluation unit (730) described below.

[0088]

[0089] Figure 3 is a block diagram of a data operation unit according to Figure 2.

[0090]

[0091] Referring to FIGS. 2 and 3, the data operation unit (710) is configured to derive battery-related information through acquired BMS data, and may include one or more modules among an SOH correction module (711), an aging operation module (712), a voltage drop operation module (713), a defective cell identification module (714), and a cumulative charge count operation module (715).

[0092] The SOH correction module (711) is a configuration that corrects the SOH value using information related to SOH (a portion of the BMS data) among the acquired BMS data. More specifically, the SOH correction module (711) calculates the SOH correction value by correcting the received SOH value by taking into account the battery pack temperature. In this case, the 'battery pack temperature' may be the temperature of the battery pack (10) at the time of measurement.

[0093] Hereinafter, the process of obtaining the SOH correction value through the acquired SOH value will be described in detail. First, information on the deviation value (x) for each temperature section is stored in the DB (790) of the server (70) in the form of a first table (791) (see FIG. 5). For example, in the temperature section of -20 to 0˚C, the deviation value (x) is set to 0.054, and in the section of 0 to 10˚C, the deviation value (x) is set to 0.087. This deviation value (x) is a user-set value and its value is not limited by the above example. In addition, since the reference temperature is set to 25˚C, for example, the deviation value (x) becomes 0 within the numerical range including the reference temperature. Therefore, the SOH correction value is a value obtained by correcting or converting the received SOH value into the SOH value at 25˚C. However, it goes without saying that the reference temperature can also be changed by the user setting.

[0094] The SOH correction value is,

[0095]

[0096] (1) SOH 25 = SOH + x * (t-25)

[0097]

[0098] It is. SOH 25 is the SOH correction value, SOH is the SOH value acquired from the BMS, and t is the value for the current battery pack (10) temperature. For example, when the current temperature (t) of the battery pack (10) is 17˚C and the acquired SOH value (SOH) is 100, referring to the first table (791), the conversion value (x) becomes 0.082, and the SOH conversion value (SOH 25 ) is 100 + 0.082 * (17-25), which is 99.344. In this way, by removing the influence of different external environments through the SOH correction module (711), an accurate SOH value can be derived. When the reference temperature is changed, the value of '25' in equation (1) can also be changed to a corresponding value.

[0099] The aging calculation module (712) is a module that calculates the aging of the current battery based on the battery cell voltage. In detail, the aging calculation module (712) can calculate the aging of the battery by comparing the new cell voltage with the current battery cell voltage acquired from the BMS. The new SOC voltage can be specified as the cell voltage of the new battery corresponding to the current battery through the 'related basic information' previously stored in the DB (790). In addition, the cell voltage of the current battery can be the average value of the battery cell voltages. Therefore, the aging of the battery is,

[0100]

[0101] (2) B DET = (1 - V NOW / V NEW ) * 100

[0102]

[0103] It can be calculated as follows. At this time, B DET is the old age, V NEW is the new battery cell voltage, V NOW refers to the average voltage of the current battery cells. For example, the voltage of a new battery cell (V NEW ) is 3.2056, and the average voltage of the current battery cell (V NOW ) is 3.2, the degree of aging (B) DET ) becomes 1 - (3.2 / 3.2056) * 100 = 17.5%.

[0104] The voltage drop value calculation module (713) calculates the new battery cell voltage (V NEW ) and the average voltage (V) of the current battery cell NOW ) is a module that calculates the voltage drop of the current battery cell based on the voltage drop value. In the example above, the voltage drop value is 0.0056 V. Through this voltage drop value calculation module (713), the average voltage drop information for the battery cells in the battery pack (10) can be confirmed.

[0105] The defective cell identification module (714) is a module that identifies defective battery cells among a number of battery cells in a battery pack (10). In more detail, the voltage of each battery cell is the average voltage (V) of the current battery cells. NOW ) can be identified as a defective cell if it exceeds the preset value. That is, among individual battery cells, the cell voltage is the average voltage (V) of the battery cells. NOW ) can be identified as a defective cell if it exceeds the lower or upper limit range.

[0106] For example, the individual battery cell voltage is the average voltage of the current battery cells (V NOW ) can be specified as a 'caution' when it exceeds the A value (e.g., 0.1 V) and a 'defect' when it exceeds the B value (e.g., 0.5 V; A < B), but the scope of the present invention is not limited by the above numerical range. In addition, the A value and the B value may be variable values ​​that differ depending on the vehicle model / year, etc., or may be fixed values, and the scope of the present invention is not limited by a specific example. The number of defective battery cells and the total number of defective battery cells are specified through the defective cell specification module (714), and the specified defective battery cells may be a concept including both caution and defective cells, or a concept including only defective cells, and there are no separate limitations thereon.

[0107] The cumulative charge count calculation module (715) is a module that specifies the cumulative charge count of a battery. In general, the performance of a battery deteriorates as the number of charges increases, so the cumulative charge count must be specified to derive the final performance score of the current battery, which will be described later. The cumulative charge count can be calculated based on the cumulative charge power included in the BMS data and the capacity of the battery pack. For example, the cumulative charge count is:

[0108]

[0109] (3) C NUM = P CHA / (B CAP* 0.9)

[0110]

[0111] It can be calculated as follows. At this time, C NUM is the cumulative number of charges, P CHA is the accumulated charging power, B CAP means the battery pack capacity. Also, 0.9 is a value that is multiplied by the battery pack capacity, and it is understood that it is not necessarily 0.9, but a variable value depending on the user setting. According to equation (3), the accumulated charging power (P CHA ) is 1086.4kWh, and the battery pack capacity (B CAP ) is 64 kWh, the cumulative number of charging cycles (C) NUM ) can be calculated as 1086.4 / (64*0.9) = 18.86 times.

[0112]

[0113] Figure 4 is a block diagram of a performance evaluation unit according to Figure 2.

[0114]

[0115] Referring to Figures 2 and 4, the performance evaluation unit (730) is configured to derive the final performance of the current battery based on battery-related information specified through the data calculation unit (710). This performance evaluation unit (730) may, for example, calculate the SOH correction value (SOH 25 ), battery aging (B DET ), voltage drop value, cell voltage deviation value, cumulative charge cycle (C NUM ) can be used to derive the final performance of the current battery pack (10), and in addition to the above information, other information such as total mileage and model year can be additionally utilized. At this time, the final performance of the current battery can be set so that it cannot exceed a preset score (e.g., 100 points), for example. In addition, the cell voltage deviation value can be the maximum deviation value between measured battery cell voltages or the maximum deviation value from the average value, and there is no separate limitation thereon.

[0116] According to one embodiment, a second table (792) is stored in the DB (790) to serve as a standard for assigning scores for each SOH correction value range, so as to assign a corresponding score (T1) to the SOH correction value (see FIG. 6). For example, when the SOH correction value is within the range of 95 to 100, 100 points may be assigned, and when the SOH correction value is within the range of 90 to 94, 95 points may be assigned. According to another embodiment, the SOH correction value may be used as is without utilizing the second table (792), and in this case, the SOH correction value itself may become the score (T1) assigned. Accordingly, the 'score (T1) assigned to the SOH correction value' may be a score assigned according to the standard set in the second table (792) or may be the SOH correction value itself.

[0117] In addition, according to one embodiment, a third table (793) is stored in the DB (790) to serve as a standard for assigning a score for each cell voltage deviation value range, so as to assign a deduction (T2) to the cell voltage deviation value (see FIG. 7). For example, when the cell voltage deviation value is within the range of 0.01 to 0.49 V, a deduction (T2) of 0 point may be assigned, and when it is within the range of 0.5 to 0.59 V, a deduction (T2) of 0 point may be assigned. According to another embodiment, the cell voltage deviation value itself may be assigned a deduction (T2) without utilizing the third table (793). Accordingly, the 'deduction (T2) assigned to the cell voltage deviation value' may be a value assigned according to a standard set in the third table (793) or may be the cell voltage deviation value itself. And, as explained above, a deduction point (T2) is given for the cell voltage deviation value, but in some cases, a bonus point (T2') may also be given. When giving a bonus point (T2'), a smaller score may be given as the cell voltage deviation value increases. The above cell voltage deviation value may be calculated through the defective cell specific module (715).

[0118] And according to one embodiment, DB (790) stores a fourth table (794) in which scores are assigned for each voltage drop value range so as to assign a deduction (T3) for the degree of voltage drop (see FIG. 8). For example, when the voltage drop value is in the range of 0.01 to 0.15 V, 0 score may be assigned, and when it is in the range of 0.16 to 0.25 V, a score (T3) of '0.2' may be assigned. According to another embodiment, the fourth table (794) may not be utilized and the voltage drop value may be utilized as is, in which case the voltage drop value itself may become the score (T3) assigned. Accordingly, the 'deduction (T3) assigned for the degree of voltage drop' may be a value assigned according to the standard set in the fourth table (794) or may be the voltage drop value itself. And although the above describes assigning a deduction (T3) for the voltage drop value, in some cases, a bonus point (T3') may be assigned. When assigning points (T3'), a smaller score can be assigned when the voltage drop value is larger. The above voltage drop value can be calculated through the voltage drop value calculation module (713).

[0119] Finally, according to one embodiment, a fifth table (795) is stored in the DB (790) to assign points (T4) based on the number of cumulative charges (see FIG. 9). For example, when the number of cumulative charges is between 1 and 100, 1 point may be assigned, and when it is between 101 and 150, 0.8 points (T4) may be assigned. However, unlike the example described above, a deduction may be assigned based on the number of cumulative charges. That is, a larger deduction is assigned as the number of cumulative charges increases.

[0120]

[0121] The above performance evaluation unit (730) may include a primary performance evaluation module (731), a final performance evaluation module (733), and a grade assignment module (735).

[0122] The primary performance evaluation module (731) is a module that calculates the primary performance score of the battery through the score (T1) assigned to the SOH correction value and the battery aging degree. For example, if the score (T1) assigned to the SOH correction value is '100' and the battery aging degree is '0.175' as in the example above, the primary performance score of the battery can be '99.825' by calculating 100 - 0.175.

[0123] The final performance evaluation module (733) is a module that calculates the final performance score of the battery by adding or subtracting one or more scores (T2 to T4) assigned based on the voltage drop value, cell voltage deviation value, and cumulative number of charges to the primary performance score of the battery. The assigned scores (T2 to T4) may be scores that match a pre-stored table, but the scope of the present invention is not limited thereto. In addition, the final performance evaluation module (733) may also calculate the final performance score by utilizing other additional information, such as the vehicle year or mileage.

[0124] The grading module (735) is a module that assigns a grade to a battery so as to match the battery's final performance score. For example, if the battery's final performance score is within 90 to 100 points, it may be assigned an 'A' grade, if it is within 80 to 89 points, it may be assigned a 'B' grade, and if it is within 70 to 79 points, it may be assigned a 'C' grade. However, the scope of the present invention is not limited by the above numerical ranges.

[0125]

[0126] Fig. 10 is a block diagram of a performance result providing unit according to Fig. 2.

[0127]

[0128] Referring to FIGS. 2 and 10, the performance result provision unit (750) is configured to display battery status information on the display unit of a user terminal (50) connected to a server (70) by app operation. This performance result provision unit (750) may include a performance indicator provision module (751), a BMS data provision module (752), a defective cell data provision module (753), a battery pack temperature data provision module (754), an accumulated charge / discharge power data provision module (755), and an individual cell voltage data provision module (756).

[0129]

[0130] FIG. 11 is a reference diagram for a user terminal display unit driven by a performance indicator provision module, a BMS data provision module, and a defective cell data provision module according to FIG. 10;

[0131]

[0132] Referring to FIGS. 10 and 11, the performance indicator provision module (751) is a module that displays one or more pieces of information among the final performance score of the battery calculated through the final performance evaluation module (733), the battery grade assigned through the grade assignment module (735), and the total number of defective battery cells specified through the defective cell specification module (715) on the display unit of the user terminal (50). Through the performance indicator provision module (751), the comprehensive results for the battery subject to the performance evaluation can be intuitively understood.

[0133] The BMS data provision module (752) is a module that displays BMS data-related information acquired through the CDS (30) and the user terminal (50) on the display unit of the user terminal (50). Through this BMS data provision module (752), the user can view detailed information about the current battery.

[0134] The defective cell data provision module (753) is a module that displays the cell number (or ID) of each defective battery cell(s) identified through the defective cell specification module (715) along with the cell voltage corresponding to the cell number on the display unit of the user terminal (50). Accordingly, the user can check not only the total number of defective battery cells through the performance indicator provision module (751), but also information on the defective battery cell number and cell voltage through the defective cell data provision module (753).

[0135]

[0136] Fig. 12 is a reference diagram for a user terminal display unit driven by a battery pack temperature data provision module according to Fig. 10.

[0137]

[0138] Referring to FIGS. 10 and 12, the battery pack temperature data provision module (754) is a module that displays information about the temperature of the battery pack sensed on a daily basis on the display unit of the user terminal (50). The battery pack temperature information provided by the battery pack temperature data provision module (754) may be provided, for example, in a graph format. In this case, the x-axis may display information about the sensing date, and the y-axis may display temperature information.

[0139]

[0140] Fig. 13 is a reference diagram for a user terminal display unit driven by a cumulative charge / discharge power data provision module according to Fig. 10.

[0141]

[0142] Referring to FIGS. 10 and 13, the cumulative charge / discharge power data provision module (755) is a module that displays the daily cumulative charge power and cumulative discharge power on the display unit of the user terminal (50). The information on the cumulative charge power and cumulative discharge power provided by the cumulative charge / discharge power data provision module (755) may be provided in the form of a graph, for example. In this case, the x-axis may display information on the sensing date, and the y-axis may display information on the power (kWh). For the convenience of user distinction, the cumulative charge power and cumulative discharge power may be displayed in different colors or shapes on the graph.

[0143]

[0144] Fig. 14 is a reference diagram for a user terminal display unit driven by an individual cell voltage data provision module according to Fig. 10.

[0145]

[0146] Referring to FIGS. 10 and 14, the individual cell voltage data providing module (756) is a module that displays information on the individual voltages of a plurality of battery cells included in a battery pack on the display unit of a user terminal (50). The individual voltages of the battery cells provided by the individual cell voltage data providing module (756) may be provided, for example, in the form of a graph. In this case, the x-axis may indicate the number of each battery cell, and the y-axis may indicate voltage information. It is preferable that each battery cell voltage be displayed, for example, in the form of a bar graph to easily recognize a defective cell, but the scope of the present invention is not limited thereto.

[0147] By making it possible to check both detailed and comprehensive information about the battery through the performance evaluation provider (750), the advantage arises in that the current battery condition and the corresponding price of the used electric vehicle can be calculated relatively easily.

[0148]

[0149] Figure 15 is a flowchart of a battery performance evaluation method according to one embodiment of the present invention.

[0150]

[0151] Hereinafter, a battery performance evaluation method (S1) according to one embodiment of the present invention will be described in detail with reference to the attached drawings. Since the battery performance evaluation method (S1) is performed through the battery performance evaluation system (1) described above, a detailed description of any overlapping content will be omitted. In addition, each sub-step of the battery performance evaluation method (S1) can be performed by the server (70).

[0152]

[0153] Figure 16 is a flowchart of step S10 according to Figure 15.

[0154]

[0155] Referring to FIGS. 15 and 16, first, battery-related information is derived (S10) through BMS data received from CDS (30) or user terminal (50). Step S10 can be performed through a data calculation unit (710). Step S10 will be described in detail. SOH-related information received from BMS can be used to calculate an SOH correction value (S110), and step S110 can be performed through an SOH correction module (711). In addition, the aging of the battery can be calculated through step S10 (S120), and this can be performed through an aging calculation module (712). In addition, the average voltage (V) of the current battery cell is derived based on the voltage of a new battery cell through step S10. NOW) is calculated (S130), which can be performed through a voltage drop value calculation module (71). In addition, through step S10, a defective battery cell in the battery pack (10) is specified (S140), which can be performed through a defective cell specification module (714). Finally, the cumulative number of charging cycles of the battery is specified (S150), which can be performed through a cumulative number of charging cycles calculation module (715). The above-described steps (S110 to S150) may be performed substantially simultaneously or in any order, and there is no particular limitation thereto.

[0156]

[0157] Fig. 17 is a flowchart of step S30 according to Fig. 15.

[0158]

[0159] Referring to FIG. 15 and FIG. 17, when battery-related information is derived through step S10, the final performance of the current battery is derived (S30). Step S30 may be performed through a performance evaluation unit (730). At this time, step S30 may be performed by, for example, calculating an SOH correction value (SOH 25 ), battery aging (B DET ), voltage drop value, cell voltage deviation value, cumulative charge cycle (C NUM ) can be used to derive the final performance of the current battery pack (10).

[0160] Step S30 will be described in detail. The primary performance score of the battery is calculated using the score assigned to the SOH correction value of the battery and the score according to the battery aging level (S310). Then, the final performance score of the battery is calculated using at least one of the scores assigned to the voltage drop value (T2), the score assigned to the cell voltage deviation value (T3), and the score assigned according to the cumulative number of charges (T4) in addition to the primary performance score (S330).

[0161] Then, a battery grade matching the final performance score of the battery can be assigned. For example, a grade can be assigned to the battery pack (10) being evaluated.

[0162]

[0163] The detailed description above is illustrative of the present invention. Furthermore, the foregoing description illustrates preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. In other words, changes or modifications may be made within the scope of the inventive concepts disclosed herein, the scope equivalent to the written disclosure, and / or the scope of technology or knowledge in the art. The above-described embodiments illustrate the best possible state for implementing the technical idea of ​​the present invention, and various modifications required for specific application fields and uses of the present invention are also possible. Therefore, the detailed description of the present invention above is not intended to limit the present invention to the disclosed embodiments.

Claims

1. Battery pack including BMS; CDS that communicates with the BMS of the above battery pack and acquires BMS data; A user terminal that connects to the server to obtain battery status information through BMS data acquired from the CDS; and A battery performance evaluation system comprising a server that generates battery-related information and / or battery status information, including the final performance score of the current battery, through BMS data acquired through the CDS or user terminal.

2. In paragraph 1, the server A data processing unit that generates battery-related information through the above BMS data; and A battery performance evaluation system characterized by including a performance evaluation unit that derives the final performance of the current battery based on battery-related information generated through the above data operation unit.

3. In the second paragraph, the data operation unit A battery performance evaluation system comprising: an SOH correction module that calculates an SOH correction value by correcting the SOH value among BMS data by taking into account the battery pack temperature.

4. In the second paragraph, the data operation unit A battery performance evaluation system comprising: an aging calculation module that calculates the aging of a battery by comparing the voltage of a new battery cell corresponding to the battery cell to be evaluated with the voltage of a current battery cell among BMS data.

5. In the fourth paragraph, the data operation unit A battery performance evaluation system characterized by further including a voltage drop value calculation module that calculates a voltage drop value by comparing the voltage of the new battery cell with the voltage of the current battery cell.

6. In the second paragraph, the data operation unit A defective cell identification module that identifies a defective battery cell among a plurality of current battery cells in the battery pack; The above defective cell specific module is A battery performance evaluation system characterized in that a cell is designated as defective if the voltage of an individual battery cell exceeds a preset value from the current battery cell average voltage.

7. In the second paragraph, the data operation unit Includes an accumulated charge count calculation module that charges the accumulated charge count of the current battery; The above cumulative charging count calculation module A battery performance evaluation system characterized by calculating the cumulative number of charging cycles based on the cumulative charging power and the capacity of the battery pack among BMS data.

8. In the second paragraph, the data operation unit It includes an SOH correction module that calculates an SOH correction value by correcting the SOH value among BMS data by considering the battery pack temperature; an aging calculation module that calculates the aging of the battery by comparing the voltage of a new battery cell corresponding to the battery cell to be evaluated with the voltage of a current battery cell among BMS data; a voltage drop calculation module that calculates a voltage drop value by comparing the voltage of the new battery cell with the voltage of the current battery cell; a defective cell identification module that identifies a defective battery cell through a cell voltage deviation value among a plurality of current battery cells in the battery pack; and an accumulated charge count calculation module that charges the accumulated charge count of the current battery. The above performance evaluation section A battery performance evaluation system characterized in that the final performance of the current battery pack is derived based on at least one piece of information from among the above SOH correction value, battery aging, voltage drop value, cell voltage deviation value, and cumulative charging number.

9. In paragraph 8, the performance evaluation unit A battery performance evaluation system characterized by including a primary performance evaluation module that calculates a primary performance score of a current battery pack by considering battery aging in a score assigned to an SOH correction value.

10. In paragraph 9, the performance evaluation unit A battery performance evaluation system characterized by further including a final performance evaluation module that calculates a final performance score of the current battery by utilizing at least one of a score assigned to a voltage drop value, a score assigned to a cell voltage deviation value, and a score assigned to a cumulative number of charges in the above-mentioned first performance score.

11. In the 10th paragraph, the performance evaluation unit A battery performance evaluation system characterized by further including a rating module that assigns a rating to a battery so as to match the final performance score of the current battery.

12. In paragraph 10, the performance evaluation unit It additionally includes a performance result provision unit that displays battery status information on the display unit of a user terminal connected to the server by operating an app; The above performance result provider A battery performance evaluation system, characterized by including a performance indicator providing module that displays information on the final performance score of the battery and the total number of defective battery cells on the display unit.

13. In paragraph 10, the performance evaluation unit It additionally includes a performance result provision unit that displays battery status information on the display unit of a user terminal connected to the server by operating an app; The above performance result provider A battery performance evaluation system, characterized by comprising: a defective cell data providing module for displaying, on the display unit, a cell voltage corresponding to the cell number of each defective battery cell.

14. In paragraph 10, the performance evaluation unit It additionally includes a performance result provision unit that displays battery status information on the display unit of a user terminal connected to the server by operating an app; The above performance result provider A battery performance evaluation system characterized by including an accumulated charge and discharge power data providing module that displays the accumulated charge and discharge power of the battery by day on the display unit.

15. In paragraph 10, the performance evaluation unit It additionally includes a performance result provision unit that displays battery status information on the display unit of a user terminal connected to the server by operating an app; The above performance result provider A battery performance evaluation system, characterized by including an individual cell voltage data providing module that displays information on individual cell voltages of a plurality of battery cells included in a current battery pack on the display unit.

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